10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(MARK ONE)

S ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2012

OR

£ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 1-12675 (Kilroy Realty Corporation)

Commission file number 000-54005 (Kilroy Realty, L.P.)

KILROY REALTY CORPORATION

KILROY REALTY, L.P.

(Exact name of registrant as specified in its charter)

Kilroy Realty Corporation	Maryland	95-4598246
	(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
Kilroy Realty, L.P.	Delaware	95-4612685
	(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
12200 W. Olympic Boulevard, Suite 200, Los Angeles, California 90064
(Address of principal executive offices) (Zip Code)
Registrant’s telephone number, including area code: (310) 481-8400
Securities registered pursuant to Section 12(b) of the Act:

Registrant	Title of each class	Name of each exchange on which registered
Kilroy Realty Corporation	Common Stock, $.01 par value	New York Stock Exchange
Kilroy Realty Corporation	6.875% Series G Cumulative Redeemable Preferred Stock, $.01 par value	New York Stock Exchange
Kilroy Realty Corporation	6.375% Series H Cumulative Redeemable Preferred Stock, $.01 par value	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act:

Registrant	Title of each class
Kilroy Realty, L.P.	Common Units Representing Limited Partnership Interests

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.    

Kilroy Realty Corporation     Yes  x    No  £

Kilroy Realty, L. P. Yes x    No  £

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act.   

Kilroy Realty Corporation Yes £     No  x

Kilroy Realty, L. P. Yes £     No  x

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. 

Kilroy Realty Corporation Yes  x    No  £

Kilroy Realty, L. P. Yes  x    No  £

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    

Kilroy Realty Corporation Yes   x   No  £

Kilroy Realty, L. P. Yes   x   No  £

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K (§229.405 of this chapter) is not contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.  x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Kilroy Realty Corporation
x Large accelerated filer	oAccelerated filer	oNon-accelerated filer (Do not check if a smaller reporting company)	o Smaller reporting company
Kilroy Realty, L.P.
o Large accelerated filer	oAccelerated filer	xNon-accelerated filer (Do not check if a smaller reporting company)	o Smaller reporting company

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    

Kilroy Realty Corporation Yes  £    No  x

Kilroy Realty, L. P. Yes  £    No  x

The aggregate market value of the voting and non-voting shares of common stock held by non-affiliates of Kilroy Realty Corporation was approximately $2,382,187,648 based on the quoted closing price on the New York Stock Exchange for such shares on June 30, 2012.

The aggregate market value of the voting and non-voting common units of limited partnership interest held by non-affiliates of Kilroy Realty, L.P. was approximately $12,415,519 based on the quoted closing price on the New York Stock Exchange for Kilroy Realty Corporation shares on June 30, 2012.

As of February 11, 2013, 74,895,990 shares of Kilroy Realty Corporation's common stock, par value $.01 per share, were outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Kilroy Realty Corporation's Proxy Statement with respect to its 2013 Annual Meeting of Stockholders to be filed not later than 120 days after the end of the registrant’s fiscal year are incorporated by reference into Part III of this Form 10-K.

EXPLANATORY NOTE

     This report combines the annual reports on Form 10-K for the year ended December 31, 2012 of Kilroy Realty Corporation and Kilroy Realty, L.P. Unless stated otherwise or the context otherwise requires, references to “Kilroy Realty Corporation” or the “Company,” “we,” “our,” and “us” mean Kilroy Realty Corporation, a Maryland corporation, and its controlled and consolidated subsidiaries, and references to “Kilroy Realty, L.P.” or the “Operating Partnership” mean Kilroy Realty, L.P., a Delaware limited partnership, and its controlled and consolidated subsidiaries.

     The Company is a real estate investment trust, or REIT, and the general partner of the Operating Partnership. As of December 31, 2012, the Company owned an approximate 97.6% common general partnership interest in the Operating Partnership. The remaining approximate 2.4% common limited partnership interests are owned by non-affiliated investors and certain directors and officers of the Company. As the sole general partner of the Operating Partnership, the Company exercises exclusive and complete discretion over the Operating Partnership's day-to-day management and control and can cause it to enter into certain major transactions including acquisitions, dispositions, and refinancings and cause changes in its line of business, capital structure, and distribution policies.

      There are a few differences between the Company and the Operating Partnership that are reflected in the disclosures in this Form 10-K. We believe it is important to understand the differences between the Company and the Operating Partnership in the context of how the Company and the Operating Partnership operate as an interrelated, consolidated company. The Company is a REIT, the only material asset of which is the partnership interests it holds in the Operating Partnership. As a result, the Company does not conduct business itself, other than acting as the sole general partner of the Operating Partnership, issuing equity from time to time and guaranteeing certain debt of the Operating Partnership. The Company itself is not directly obligated under any indebtedness, but guarantees some of the debt of the Operating Partnership. The Operating Partnership owns substantially all of the assets of the Company either directly or through its subsidiaries, conducts the operations of the Company's business and is structured as a limited partnership with no publicly-traded equity. Except for net proceeds from equity issuances by the Company, which the Company is required to contribute to the Operating Partnership in exchange for units of partnership interest, the Operating Partnership generates the capital required by the Company's business through the Operating Partnership's operations, by the Operating Partnership's incurrence of indebtedness or through the issuance of units of partnership interest.

     Noncontrolling interests and stockholders' equity and partners' capital are the main areas of difference between the consolidated financial statements of the Company and those of the Operating Partnership. The common limited partnership interests in the Operating Partnership are accounted for as partners' capital in the Operating Partnership's financial statements and, to the extent not held by the Company, as noncontrolling interests in the Company's financial statements. The Operating Partnership's financial statements reflect the noncontrolling interest in Kilroy Realty Finance Partnership, L.P. a Delaware limited partnership (the “Finance Partnership”). This noncontrolling interest represents the Company's 1% indirect general partnership interest in the Finance Partnership, which is directly held by Kilroy Realty Finance, Inc., a wholly-owned subsidiary of the Company. The differences between stockholders' equity, partners' capital and noncontrolling interests result from the differences in the equity issued by the Company and the Operating Partnership, and in the Company's noncontrolling interest in the Finance Partnership.

     We believe combining the annual reports on Form 10-K of the Company and the Operating Partnership into this single report results in the following benefits:

• Combined reports better reflect how management and the analyst community view the business as a single operating unit;

• Combined reports enhance investors' understanding of the Company and the Operating Partnership by enabling them to view the business as a whole and in the same manner as management;

• Combined reports are more efficient for the Company and the Operating Partnership and result in savings in time, effort and expense; and

• Combined reports are more efficient for investors by reducing duplicative disclosure and providing a single document for their review.

     To help investors understand the significant differences between the Company and the Operating Partnership, this report presents the following separate sections for each of the Company and the Operating Partnership:

• consolidated financial statements;

• the following notes to the consolidated financial statements:

◦ Note 6, Secured and Unsecured Debt of the Company;

◦ Note 7, Secured and Unsecured Debt of the Operating Partnership;

◦ Note 9, Noncontrolling Interests on the Company's Consolidated Financial Statements;

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◦ Note 10, Stockholders' Equity of the Company;

◦ Note 11, Preferred and Common Units of the Operating Partnership;

◦ Note 19, Net Income Available to Common Stockholders Per Share of the Company;

◦ Note 20, Net Income Available to Common Unitholders Per Unit of the Operating Partnership;

◦ Note 22, Quarterly Financial Information of the Company (Unaudited);

◦ Note 23, Quarterly Financial Information of the Operating Partnership (Unaudited);

◦ Note 25, Pro Forma Results of the Company (Unaudited); and

◦ Note 26, Pro Forma Results of the Operating Partnership (Unaudited);

• “Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources of the Company”; and

• “Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources of the Operating Partnership”.

     This report also includes separate sections under Item 9A. Controls and Procedures and separate Exhibit 31 and Exhibit 32 certifications for each of the Company and the Operating Partnership to establish that the Chief Executive Officer and the Chief Financial Officer of each entity have made the requisite certifications and that the Company and Operating Partnership are compliant with Rule 13a-15 or Rule 15d-15 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and 18 U.S.C. §1350.

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TABLE OF CONTENTS

	PART I
		Page
Item 1.	Business	4
Item 1A.	Risk Factors	11
Item 1B.	Unresolved Staff Comments	22
Item 2.	Properties	23
Item 3.	Legal Proceedings	33
Item 4.	Mine Safety Disclosures	33
	PART II
Item 5.	Market for Kilroy Realty Corporation's Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	34
	Market for Kilroy Realty, L.P.'s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	34
Item 6.	Selected Financial Data - Kilroy Realty Corporation	36
	Selected Financial Data - Kilroy Realty, L.P.	38
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	40
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	74
Item 8.	Financial Statements and Supplementary Data	75
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	75
Item 9A.	Controls and Procedures	75
Item 9B.	Other Information	79
	PART III
Item 10.	Directors, Executive Officers and Corporate Governance	79
Item 11.	Executive Compensation	79
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	79
Item 13.	Certain Relationships and Related Transactions, and Director Independence	79
Item 14.	Principal Accountant Fees and Services	79
	PART IV
Item 15.	Exhibits and Financial Statement Schedules	80
	SIGNATURES	87

PART I

This document contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Exchange Act, including information concerning projected future occupancy and rental rates, lease expirations, debt maturity, potential investments, strategies such as capital recycling, development and redevelopment activity, projected construction costs, dispositions, future executive incentive compensation and other forward-looking financial data, as well as the discussion in “Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations-Factors That May Influence Future Results of Operations.” Forward-looking statements are based on our current expectations, beliefs and assumptions, and are not guarantees of future performance. Forward-looking statements are inherently subject to uncertainties, risks, changes in circumstances, trends and factors that are difficult to predict, many of which are outside of our control. Accordingly, actual performance, results and events may vary materially from those indicated in the forward-looking statements, and you should not rely on the forward-looking statements as predictions of future performance, results or outcomes. All forward-looking statements are based on currently available information and speak only as of the date on this report was filed with the Securities and Exchange Commission (the “SEC”).

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ITEM 1. BUSINESS

The Company

We are a self-administered REIT active in office submarkets along the West Coast. We own, develop, acquire and manage real estate assets, consisting primarily of Class A properties in the coastal regions of Los Angeles, Orange County, San Diego County, the San Francisco Bay Area and greater Seattle, which we believe have strategic advantages and strong barriers to entry. Class A properties encompass attractive and efficient buildings of high quality that are attractive to tenants, are well-designed and constructed with above-average material, workmanship and finishes and are well-maintained and managed. We qualify as a REIT under the Internal Revenue Code of 1986, as amended (the "Code").

Our portfolio of operating properties was comprised of the following office buildings at December 31, 2012.

	Number of Buildings	Rentable Square Feet	Number of Tenants	Percentage Occupied
Office Properties	114	13,249,780	530	92.8	%

During the fourth quarter of 2012 we disposed of our entire portfolio of 39 industrial properties and, as a result, no longer owned any industrial properties at December 31, 2012.

Our stabilized portfolio includes all of our properties with the exception of undeveloped land, development and redevelopment properties currently under construction or committed for construction, “lease-up” properties and properties held-for-sale. We define “lease-up” properties as properties we recently developed or redeveloped that have not yet reached 95% occupancy and are within one year following cessation of major construction activities. We define redevelopment properties as those projects for which we expect to spend significant development and construction costs on existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. Our stabilized portfolio also excludes our future development pipeline, which is comprised of nine potential development sites, including one office property moved from the stabilized portfolio to the development pipeline in the fourth quarter of 2012, representing 118.5 gross acres of undeveloped land.

As of December 31, 2012, the following properties were excluded from our stabilized portfolio:

	Number of Properties	Estimated Rentable Square Feet (1)
Development properties under construction	4	1,416,000
Redevelopment properties under construction	1	410,000
Lease-up properties	1	98,000

________________________

(1) Estimated rentable square feet upon completion.

As of December 31, 2012, all of our properties and development and redevelopment projects are owned and all of our business is currently conducted in the state of California with the exception of ten office properties located in the state of Washington. We had no properties held-for-sale as of December 31, 2012.

We own our interests in all of our office properties through the Operating Partnership and the Finance Partnership. We conduct substantially all of our operations through the Operating Partnership of which we owned a 97.6% general partnership interest as of December 31, 2012. The remaining 2.4% common limited partnership interest was owned by certain of our directors and executive officers and non-affiliated investors. Kilroy Realty Finance, Inc., a wholly-owned subsidiary of the Company, is the sole general partner of the Finance Partnership and owns a 1.0% general partnership interest. The Operating Partnership owns the remaining 99.0% limited partnership interest. We conduct substantially all of our development activities through Kilroy Services, LLC ("KSLLC"), which is a wholly-owned subsidiary of the Operating Partnership. With the exception of the Operating Partnership, all of the Company's subsidiaries are wholly-owned.

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The following diagram illustrates our organizational structure as of December 31, 2012:

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Available Information; Website Disclosure; Corporate Governance Documents

Kilroy Realty Corporation was incorporated in the state of Maryland on September 13, 1996 and Kilroy Realty, L.P. was organized in the state of Delaware on October 2, 1996. Our principal executive offices are located at 12200 W. Olympic Boulevard, Suite 200 Los Angeles, California 90064. Our telephone number at that location is (310) 481-8400. Our website is located at www.kilroyrealty.com. The information found on, or otherwise accessible through, our website is not incorporated into, and does not form a part of, this annual report on Form 10-K or any other report or document we file with or furnish to the SEC. All reports we will file with the SEC will be available free of charge via EDGAR through the SEC website at www.sec.gov. In addition, the public may read and copy materials we file with the SEC at the SEC's public reference room located at 100 F Street, N.E., Washington, D.C. 20549. All reports that we will file with the SEC will also be available free of charge on our website at www.kilroyrealty.com as soon as reasonably practicable after we file those materials with, or furnish them to, the SEC.

The following documents relating to corporate governance are also available free of charge on our website under “Investor Relations—Corporate Governance” and available in print to any security holder upon request:

• Corporate Governance Guidelines;

• Code of Business Conduct and Ethics;

• Audit Committee Charter;

• Executive Compensation Committee Charter; and

• Nominating / Corporate Governance Committee Charter.

You may request copies of any of these documents by writing to:

Attention: Investor Relations

Kilroy Realty Corporation

12200 West Olympic Boulevard, Suite 200

Los Angeles, California 90064

Business and Growth Strategies

Growth Strategies.    We believe that a number of factors and strategies will enable us to continue to achieve our objectives of long-term sustainable growth in Net Operating Income (defined below) and FFO (defined below) as well as maximization of long-term stockholder value. These factors and strategies include:

• the quality and location of our properties;

• our ability to efficiently manage our assets as a low cost provider of commercial real estate through our seasoned management team possessing core capabilities in all aspects of real estate ownership, including property management, leasing, marketing, financing, accounting, legal, construction and development management;

• our ability to capitalize on inflection points in a real estate cycle to add quality assets to our portfolio at substantial discounts to long-term value, through either acquisition, development or redevelopment;

• our strong financial position that has and will continue to allow us to pursue attractive acquisition and development and redevelopment opportunities;

• our access to development, redevelopment, acquisition, and leasing opportunities as a result of our extensive experience and significant working relationships with major West Coast property owners, corporate tenants, municipalities, and landowners given our over 65-year presence in the West Coast markets;

• our capital recycling program (see “Item 7: Management’s Discussion and Analysis of Financial Condition and Results of Operations —Liquidity Sources” for additional information pertaining to the Company's capital recycling program and related 2012 property dispositions); and

• our future development pipeline of undeveloped land sites.

“Net Operating Income” is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, provision for bad debts, and ground leases) before depreciation. “FFO” is funds from operations as defined by the National Association of Real Estate Investment Trusts (“NAREIT”). See “Item 7: Management’s Discussion and Analysis of Financial Condition and Results of Operations —Results of Operations” and “—Non-GAAP Supplemental Financial Measures: Funds From Operations” for a reconciliation of these measures to generally accepted accounting principles (“GAAP”) net income available to common stockholders.

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Operating Strategies.    We focus on enhancing long-term growth in Net Operating Income and FFO from our properties by:

• maximizing cash flow from our properties through active leasing, early renewals, and effective property management;

• structuring leases to maximize returns and internal growth;

• managing portfolio credit risk through effective underwriting, including the use of credit enhancements and interests in collateral to mitigate portfolio credit risk;

• managing operating expenses through the efficient use of internal management, leasing, marketing, financing, accounting, legal, and construction management functions;

• maintaining and developing long-term relationships with a diverse tenant base;

• managing our properties to offer the maximum degree of utility and operational efficiency to tenants;

• building substantially all of our recent development projects to Leadership in Energy and Environmental Design (LEED) specifications, achieving gold or silver certification levels for several of our buildings, including the first LEED Platinum ground-up commercial development in San Francisco at 350 Mission Street;

• actively pursuing LEED certification for over 3.2 million square feet of office space within our existing portfolio;

• aggressively pursuing high-performance environmental building initiatives that create economic value for our tenants, shareholders and employees;

• continuing to effectively manage capital improvements to enhance our properties’ competitive advantages in their respective markets and improve the efficiency of building systems;

• enhancing our management team with individuals who have extensive regional experience and are highly knowledgeable in their respective markets; and

• attracting and retaining motivated employees by providing financial and other incentives to meet our operating and financial goals.

Acquisition Strategies.    We believe we are well positioned to acquire properties and development and redevelopment opportunities as the result of our extensive experience, strong financial position, and ability to access capital. We continue to actively monitor our target markets and focus on acquiring additional high quality office properties and development and redevelopment opportunities that:

• provide attractive yields and significant potential for growth in cash flow from property operations;

• present growth opportunities in our existing or other strategic markets; and

• demonstrate the potential for improved performance through intensive management, repositioning and leasing that should result in increased occupancy and rental revenues.

Development and Redevelopment Strategies.    We and our predecessors have developed office and industrial properties primarily located in California since 1947. As of December 31, 2012, our future development pipeline was comprised of nine potential development sites, representing 118.5 gross acres of undeveloped land on which we believe we have the potential to develop over two million rentable square feet of office space, depending upon economic conditions. Our strategy with respect to development is to:

• maintain a disciplined approach by emphasizing pre-leasing, commencing development in stages, or phasing, and cost control;

• continue to execute our build-to-suit philosophy in which we develop properties to be leased by specific committed tenants providing for lower-risk development;

• be the premier provider of modern and collaborative office buildings on the West Coast;

• reinvest capital from dispositions of nonstrategic assets into new state-of-the-market development and acquisition assets with higher cash flow and rates of return;

• evaluate redevelopment opportunities in supply-constrained markets because such efforts generally achieve similar returns to new development with reduced entitlement risk and shorter construction periods; and

• execute on our development projects under construction and our future development pipeline.

Redevelopment opportunities are those projects in which we spend significant development and construction costs on existing buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. We may engage in

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the additional development or redevelopment of office properties when market conditions support a favorable risk−adjusted return on such development or redevelopment. We expect that our significant working relationships with tenants, municipalities, and landowners on the West Coast will give us further access to development and redevelopment opportunities. We cannot assure you that we will be able to successfully develop or redevelop any of our properties or that we will have access to additional development or redevelopment opportunities.

Financing Strategies.    Our financing policies and objectives are determined by our board of directors. Our goal is to limit our dependence on leverage and maintain a conservative ratio of debt-to-total market capitalization. As of December 31, 2012, our total debt as a percentage of total market capitalization was 34.7%, and our total debt and liquidation value of our preferred equity as a percentage of total market capitalization was 38.1%, both of which were calculated based on the quoted closing price per share of the Company's common stock of $47.37 on December 31, 2012 (see "Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources of the Company - Capitalization" for additional information). Our financing strategies include:

• maintaining financial flexibility, including a low secured to unsecured debt ratio, to maximize our ability to access a variety of both public and private capital sources;

• maintaining a staggered debt maturity schedule in which the maturity dates of our debt are spread over several years to limit risk exposure at any particular point in the capital and credit market cycles;

• completing financing in advance of the need for capital; and

• managing interest rate exposure by generally maintaining a greater amount of fixed-rate debt as compared to variable-rate debt.

We utilize multiple sources of capital, including borrowings under our unsecured line of credit, proceeds from the issuance of public or private debt or equity securities and other bank and/or institutional borrowings, and dispositions of nonstrategic assets. There can be no assurance that we will be able to obtain capital as needed on terms favorable to us or at all. See the discussion under the caption “Item 7: Management’s Discussion and Analysis of Financial Condition and Results of Operations —Factors That May Influence Future Results of Operations” and “Item 1A: Risk Factors”.

Significant Tenants

As of December 31, 2012, our 15 largest tenants in terms of annualized base rental revenues represented approximately 34.1% of our total annualized base rental revenues, defined as annualized monthly contractual rents from existing tenants as of December 31, 2012. Annualized base rental revenue includes the impact of straight-lining rent escalations and the amortization of free rent periods and excludes the impact of the following: amortization of deferred revenue related tenant-funded tenant improvements, amortization of above/below market rents, amortization for lease incentives due under existing leases, and expense reimbursement revenue.

For further information on our 15 largest tenants and the composition of our tenant base, see “Item 2: Properties —Significant Tenants.”

Competition

We compete with several developers, owners, operators and acquirers of office and other commercial real estate, many of which own properties similar to ours in the same submarkets in which our properties are located. For further discussion of the potential impact of competitive conditions on our business, see “Item 1A: Risk Factors”.

Segment and Geographic Financial Information

For the year ended December 31, 2012, we only had one segment, our office properties segment. During the fourth quarter of 2012, we sold our entire portfolio of industrial properties and, as a result, no longer owned any industrial properties at December 31, 2012. For information about our office property revenues and long-lived assets and other financial information, see Note 18 to our consolidated financial statements included in this report and “Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations -Results of Operations.”

All of our properties are located and all of our business is currently conducted in the state of California with the exception of the ownership and operation of ten office properties located in the state of Washington.

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Employees

As of December 31, 2012, we employed 201 people through the Operating Partnership, KSLLC, and Kilroy Realty TRS, Inc. We believe that relations with our employees are good.

Environmental Regulations and Potential Liabilities

Government Regulation Relating to the Environment. Many laws and governmental regulations relating to the environment are applicable to our properties, and changes in these laws and regulations, or their interpretation by agencies and the courts, occur frequently and may adversely affect us.

Existing conditions at some of our properties.    Independent environmental consultants have conducted Phase I or similar environmental site assessments on all of our properties. We generally obtain these assessments prior to the acquisition of a property and may later update them as required for subsequent financing of the property or as requested by a tenant. Site assessments are generally performed to American Society for Testing and Materials standards then-existing for Phase I site assessments and typically include a historical review, a public records review, a visual inspection of the surveyed site, and the issuance of a written report. These assessments do not generally include any soil samplings or subsurface investigations. Depending on the age of the property, the Phase I may have included an assessment of asbestos-containing materials. For properties where asbestos-containing materials were identified or suspected, an operations and maintenance plan was generally prepared and implemented.

Historical operations at or near some of our properties, including the presence of underground or above ground storage tanks, may have caused soil or groundwater contamination. In some instances, the prior owners of the affected properties conducted remediation of known contamination in the soils on our properties, and we do not believe that further clean-up of the soils is required. We are not aware of any such condition, liability, or concern by any other means that would give rise to material environmental liability. However, the assessments may have failed to reveal all environmental conditions, liabilities, or compliance concerns; there may be material environmental conditions, liabilities, or compliance concerns that arose at a property after the review was completed; future laws, ordinances, or regulations may impose material additional environmental liability; and environmental conditions at our properties may be affected in the future by tenants, third parties, or the condition of land or operations near our properties, such as the presence of underground storage tanks. We cannot be certain that costs of future environmental compliance will not have an adverse effect on our financial condition, results of operations, cash flow, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to security holders.

Use of hazardous materials by some of our tenants.    Some of our tenants handle hazardous substances and wastes on our properties as part of their routine operations. Environmental laws and regulations may subject these tenants, and potentially us, to liability resulting from such activities. We generally require our tenants in their leases to comply with these environmental laws and regulations and to indemnify us for any related liabilities. As of December 31, 2012, other than routine cleaning materials, approximately 5% of our tenants handled hazardous substances and/or wastes on less than 4% of the aggregate square footage of our properties as part of their routine operations. These tenants are primarily involved in the life sciences business. The hazardous substances and wastes are primarily comprised of diesel fuel for emergency generators and small quantities of lab and light manufacturing chemicals including, but not limited to, alcohol, ammonia, carbon dioxide, cryogenic gases, dichlorophenol, methane, naturalyte acid, nitrogen, nitrous oxide, and oxygen which are routinely used by life science companies. We are not aware of any material noncompliance, liability, or claim relating to hazardous or toxic substances or petroleum products in connection with any of our properties, and management does not believe that on-going activities by our tenants will have a material adverse effect on our operations.

Costs related to government regulation and private litigation over environmental matters.    Under applicable environmental laws and regulations, we may be liable for the costs of removal, remediation, or disposal of certain hazardous or toxic substances present or released on our properties. These laws could impose liability without regard to whether we are responsible for, or even knew of, the presence or release of the hazardous materials. Government investigations and remediation actions may have substantial costs, and the presence or release of hazardous substances on a property could result in governmental clean-up actions, personal injury actions, or similar claims by private plaintiffs.

Potential environmental liabilities may exceed our environmental insurance coverage limits or transactional indemnities.    We carry what we believe to be commercially reasonable environmental insurance. Our environmental insurance policies are subject to various terms, conditions and exclusions. Similarly, in connection with some transactions we obtain environmental indemnities that may not be honored by the indemnitors or may fail to address resulting liabilities adequately. Therefore, we cannot provide any assurance that our insurance coverage or transactional indemnities will be sufficient or that our liability, if any, will not have a material adverse effect on our financial condition, results of operations, cash flows, quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to security holders.

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ITEM 1A RISK FACTORS

The following section sets forth material factors that may adversely affect our business and operations. The following factors, as well as the factors discussed in “Item 7: Management’s Discussion and Analysis of Financial Condition and Results of Operations —Factors That May Influence Future Results of Operations” and other information contained in this report, should be considered in evaluating us and our business.

Risks Related to our Business and Operations

Global market and economic conditions may adversely affect our liquidity and financial condition and those of our tenants. In the United States, market and economic conditions continue to be challenging with stricter regulations and modest growth. While recent economic data reflects moderate economic growth in the United States, the cost and availability of credit may continue to be adversely affected by governmental budget and global economic factors. Concern about continued stability of the economy and credit markets generally, and the strength of counterparties specifically, has led many lenders and institutional investors to reduce and, in some cases, cease to provide funding to borrowers. Volatility in the U.S. and international capital markets and concern over a return to recessionary conditions in global economies, and in the California economy in particular, may adversely affect our liquidity and financial condition and the liquidity and financial condition of our tenants. If these market conditions continue, they may limit our ability and the ability of our tenants to timely refinance maturing liabilities and access the capital markets to meet liquidity needs.

All of our properties are located in California and Greater Seattle, Washington and we may therefore be susceptible to adverse economic conditions and regulations, as well as natural disasters, in those areas. Because all of our properties are concentrated in California and Seattle, Washington we may be exposed to greater economic risks than if we owned a more geographically dispersed portfolio. Further, within California, our properties are concentrated in Los Angeles, Orange County, San Diego County, and the San Francisco Bay Area, exposing us to risks associated with those specific areas. We are susceptible to adverse developments in the economic and regulatory environments of California and Greater Seattle, Washington (such as business layoffs or downsizing, industry slowdowns, relocations of businesses, increases in real estate and other taxes, costs of complying with governmental regulations or increased regulation and other factors) as well as adverse weather conditions and natural disasters that occur in these areas (such as earthquakes, wind, landslides, fires and other events). In addition, California is also regarded as more litigious and more highly regulated and taxed than many other states, which may reduce demand for office space in California.

Any adverse developments in the economy or real estate market in California and the surrounding region, or in Seattle, Washington or any decrease in demand for office space resulting from the California or Seattle regulatory or business environment could impact our ability to generate revenues sufficient to meet our operating expenses or other obligations, which would adversely impact our financial condition, results of operations, cash flows, the quoted trading price of the Company's common stock and of the Operating Partnership's publicly-traded notes and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

Our performance and the market value of our securities are subject to risks associated with our investments in real estate assets and with trends in the real estate industry. Our economic performance and the value of our real estate assets and, consequently the market value of the Company's securities, are subject to the risk that our properties may not generate revenues sufficient to meet our operating expenses or other obligations. A deficiency of this nature would adversely impact our financial condition, results of operations, cash flows, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

Events and conditions applicable to owners and operators of real estate that are beyond our control and could impact our economic performance and the value of our real estate assets may include:

• local oversupply or reduction in demand for office or other commercial space, which may result in decreasing rental rates and greater concessions to tenants;

• inability to collect rent from tenants;

• vacancies or inability to rent space on favorable terms or at all;

• inability to finance property development and acquisitions on favorable terms or at all;

• increased operating costs, including insurance premiums, utilities, and real estate taxes;

• costs of complying with changes in governmental regulations;

• the relative illiquidity of real estate investments;

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• changing submarket demographics;

• the development of harmful mold or other airborne toxins or contaminants that could damage our properties or expose us to third-party liabilities; and

• property damage resulting from seismic activity or other natural disasters.

        We depend upon significant tenants and the loss of a significant tenant could adversely affect our financial condition, revenues and results of operations. As of December 31, 2012, our 15 largest tenants represented approximately 34.1% of total annualized base rental revenues. See further discussion on the composition of our tenants by industry and our largest tenants under “Item 2: Properties -Significant Tenants.”

Our financial condition, results of operations, ability to borrow funds, and cash flows would be adversely affected if any of our significant tenants fails to renew its lease(s), renew its lease(s) on terms less favorable to us, or becomes bankrupt or insolvent or otherwise unable to satisfy its lease obligations.

Downturn in tenants' businesses may reduce our cash flows. For the year ended December 31, 2012, we derived approximately 99.2% of our revenues from continuing operations from rental income and tenant reimbursements. A tenant may experience a downturn in its business, which may weaken its financial condition and result in its failure to make timely rental payments or result in defaults under our leases. In the event of default by a tenant, we may experience delays in enforcing our rights as landlord and may incur substantial costs in protecting our investment.

The bankruptcy or insolvency of a major tenant also may adversely affect the income produced by our properties. If any tenant becomes a debtor in a case under federal bankruptcy law, we cannot evict the tenant solely because of the bankruptcy. In addition, the bankruptcy court might permit the tenant to reject and terminate its lease with us. Our claim against the tenant for unpaid and future rent could be subject to a statutory cap that might be substantially less than the remaining rent actually owed under the lease. Therefore, our claim for unpaid rent would likely not be paid in full. Any losses resulting from the bankruptcy of any of our existing tenants could adversely impact our financial condition, results of operations, cash flows, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

A large percentage of our tenants' operate in a concentrated group of industries and downturns in these industries could adversely affect our financial condition, revenues and results of operations. As of December 31, 2012, as a percentage of our annualized base rental revenue, 36% of our tenants operated in the technology and media industry, 19% in the finance, insurance and real estate industry, 15% in the professional, business and other services industry, and 11% in the education and health services industry (of which approximately 5% are in the for profit education sector). As we expand our acquisition and development activities in markets populated by high growth tenants in the technology and media industry, our tenant mix may become more concentrated, further exposing us to risks associated with that industry. For a further discussion of the composition of our tenants by industry, see “Item 2: Properties—Significant Tenants.” An economic downturn in any of these industries, or in any industry in which a significant number of our tenants currently or may in the future operate, could negatively impact the financial condition of such tenants and cause them to fail to make timely rental payments or default on lease obligations, fail to renew their leases or renew their leases on terms less favorable to us, become bankrupt or insolvent, or otherwise become unable to satisfy their obligations to us. As a result, a downturn in an industry in which a significant number of our tenants operate could adversely affect our financial conditions and result of operations.

We may be unable to renew leases or re-lease available space. We had office space representing approximately 7.2%, of the total square footage of our properties that was not occupied as of December 31, 2012. In addition, leases representing approximately 7.1% and 10.4% of the leased rentable square footage of our properties are scheduled to expire in 2013 and 2014, respectively. Above market rental rates on some of our properties may force us to renew or re-lease expiring leases at rates below current lease rates. As of December 31, 2012, we believe that the weighted average cash rental rates for our overall portfolio, including recently acquired properties, are approximately at the current average quoted market rental rates, and weighted average cash rental rates for leases scheduled to expire during 2013 are approximately 5% below the current average quoted market rental rates, although individual properties within any particular submarket presently may be leased at, above, or below the current market rental rates within that submarket. We cannot provide any assurance that leases will be renewed or that available space will be re-leased at rental rates equal to or above the current rental rates. If the average rental rates for our properties decrease or existing tenants do not renew their leases, our financial condition, results of operations, cash flows, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders could be adversely affected.

We are subject to governmental regulations that may affect the development, redevelopment, and use of our properties. We are subject to governmental regulations that may have a material adverse effect on our financial condition, results of operations,

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cash flow, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

Our properties are subject to regulation under federal laws, such as the Americans with Disabilities Act of 1990 (the “ADA”) pursuant to which all public accommodations must meet federal requirements related to access and use by disabled persons, and state and local laws addressing earthquake, fire, and life safety requirements. Although we believe that our properties substantially comply with requirements under applicable governmental regulations, none of our properties have been audited or investigated for compliance by any regulatory agency. If we were not in compliance with material provisions of the ADA or other regulations affecting our properties, we might be required to take remedial action, which could include making modifications or renovations to properties. Federal, state, or local governments may also enact future laws and regulations that could require us to make significant modifications or renovations to our properties. If we were to incur substantial costs to comply with the ADA or any other regulations, our financial condition, results of operations, cash flows, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders could be adversely affected.

Our properties are subject to land use rules and regulations that govern our development, redevelopment, and use of our properties. Restrictions on our ability to develop, redevelop, or use our properties resulting from changes in the existing land use rules and regulations could have an adverse effect on our financial position, results of operations, cash flows, quoted trading price of our securities, our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

Our debt level reduces cash available for distribution and may expose us to the risk of default under our debt obligations. Payments of principal and interest on borrowings may leave us with insufficient cash resources to operate our properties or to pay in cash the distributions necessary to maintain the Company's REIT qualification. Our level of debt and the limitations imposed by our debt agreements may have substantial consequences to us, including the following:

• we may be unable to refinance our indebtedness at maturity, or the refinancing terms may be less favorable than the terms of our original indebtedness;

• cash flows may be insufficient to meet required principal and interest payments;

• we may be forced to dispose of one or more of our properties, possibly on disadvantageous terms;

• we may default on our obligations, and the lenders or mortgagees may foreclose on our properties that secure the loans and receive an assignment of rents and leases; and

• our default under one mortgage loan could result in a default on other indebtedness with cross default provisions.

If one or more of these events were to occur, our financial condition, results of operations, cash flow, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders could be adversely affected. In addition, foreclosures could create taxable income without accompanying cash proceeds,

which could require us to borrow or sell assets to raise the funds necessary to meet the REIT distribution requirements discussed below, even if such actions are not on favorable terms. As of December 31, 2012, we had approximately $2.0 billion aggregate principal amount of indebtedness, $90.9 million of which is contractually due prior to December 31, 2013. Our total debt and preferred equity at December 31, 2012 represented 38.1% of our total market capitalization (which we define as the aggregate of our long-term debt, liquidation value of our preferred equity, and the market value of the Company's common stock and the Operating Partnership's common units of limited partnership interest, or common units). In January 2013, we repaid $83.1 million of the total amount contractually due prior to December 31, 2013. In addition, on January 14, 2013, the Operating Partnership issued $300.0 million of 3.8% senior unsecured notes due 2023 and used the proceeds from the offering to repay the remaining outstanding balance on the Operating Partnership's $500 million unsecured revolving credit facility. For calculation of our market capitalization and additional information on debt maturities see “Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations —Liquidity and Capital Resources of the Company—Capitalization and Liquidity Uses.”

The covenants in the Operating Partnership's revolving credit facility and term loan facility may limit our ability to make distributions to the holders of our common stock. The Operating Partnership's revolving credit facility and $150.0 million unsecured term loan facility contain financial covenants that could limit the amount of distributions payable by us on our common stock and preferred stock. We rely on cash distributions we receive from the Operating Partnership to pay distributions on our common stock and preferred stock and to satisfy our other cash needs, and the revolving credit facility and the term loan facility provide that the Operating Partnership may not, in any year, make partnership distributions to us or other holders of its partnership interests in an aggregate amount in excess of the greater of:

• 95% of the Operating Partnership's consolidated funds from operations (as similarly defined in each of the revolving credit facility and term loan facility agreements) for such year; and

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• an amount which results in distributions to us (excluding any preferred partnership distributions to the extent the same have been deducted from consolidated funds from operations for such year) in an amount sufficient to permit us to pay dividends to our stockholders that we reasonably believe are necessary to (a) maintain our qualification as a REIT for federal and state income tax purposes and (b) avoid the payment of federal or state income or excise tax.

In addition, the revolving credit facility and term loan facility provide that, if the Operating Partnership fails to pay any principal of or interest on any borrowings under the revolving credit facility or term loan facility, respectively, when due, then the Operating Partnership may make only those partnership distributions to us and other holders of its partnership interests necessary to enable us to make distributions to our stockholders that we reasonably believe are necessary to maintain our status as a REIT for federal and state income tax purposes. Any limitation on our ability to make distributions to our stockholders, whether as a result of these provisions in the revolving credit facility, the term loan facility or otherwise, could have a material adverse effect on the market value of our common stock and preferred stock.

A downgrade in our credit ratings could materially adversely affect our business and financial condition. The credit ratings assigned to the debt securities of the Operating Partnership and our preferred stock could change based upon, among other things, our results of operations and financial condition. These ratings are subject to ongoing evaluation by credit rating agencies, and we cannot assure you that any rating will not be changed or withdrawn by a rating agency in the future if, in its judgment, circumstances warrant. Moreover, these credit ratings do not apply to our common stock and are not recommendations to buy, sell or hold any other securities. If any of the credit rating agencies that have rated the debt securities of the Operating Partnership or our preferred stock downgrades or lowers its credit rating, or if any credit rating agency indicates that it has placed any such rating on a so-called “watch list” for a possible downgrading or lowering or otherwise indicates that its outlook for that rating is negative, it could have a material adverse effect on our costs and availability of capital, which could in turn have a material adverse effect on our financial condition, results of operations, cash flows and our ability to satisfy our debt service obligations and to make dividends and distributions on our common stock and preferred stock.

We face significant competition, which may decrease the occupancy and rental rates of our properties. We compete with several developers, owners, and operators of office and other commercial real estate, many of which own properties similar to ours in the same submarkets in which our properties are located but which have lower occupancy rates than our properties. Therefore, our competitors have an incentive to decrease rental rates until their available space is leased. As previously mentioned, as of December 31, 2012 we believe that the weighted average cash rental rates for our overall portfolio are approximately at the current average quoted market rental rates. If our competitors offer space at rental rates below the rates currently charged by us for comparable space, we may be pressured to reduce our rental rates below those currently charged in order to retain tenants when our tenant leases expire. As a result, our financial condition, results of operations, cash flow, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders may be adversely affected.

In order to maintain the quality of our properties and successfully compete against other properties, we must periodically spend money to maintain, repair, and renovate our properties, which reduces our cash flows. If our properties are not as attractive to current and prospective tenants in terms of rent, services, condition, or location as properties owned by our competitors, we could lose tenants or suffer lower rental rates. As a result, we may from time to time be required to make significant capital expenditures to maintain the competitiveness of our properties. There can be no assurances that any such expenditure would result in higher occupancy or higher rental rates, or deter existing tenants from relocating to properties owned by our competitors.

Potential casualty losses, such as earthquake losses, may not be covered by insurance and payment of such losses may adversely affect our financial condition and results of operations. We carry comprehensive liability, fire, extended coverage, rental loss, and terrorism insurance covering all of our properties. Management believes the policy specifications and insured limits are appropriate given the relative risk of loss, the cost of the coverage, and industry practice. We do not carry insurance for generally uninsurable losses such as loss from riots or acts of God. In addition, all of our properties are located in earthquake-prone areas. We carry earthquake insurance on our properties in an amount and with deductibles that management believes are commercially reasonable. However, the amount of our earthquake insurance coverage may not be sufficient to cover losses from earthquakes. We may also discontinue earthquake insurance on some or all of our properties in the future if the cost of premiums for earthquake insurance exceeds the value of the coverage discounted for the risk of loss. If we experience a loss that is uninsured or which exceeds policy limits, we could lose the capital invested in the damaged properties as well as the anticipated future cash flows from those properties. Further, if the damaged properties are subject to recourse indebtedness, we would continue to be liable for the indebtedness, even if the properties were irreparable.

We are subject to environmental and health and safety laws and regulations, and any costs to comply with, or liabilities arising under, such laws and regulations could be material. As an owner, operator, manager, acquirer and developer of real

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properties, we are subject to environmental and health and safety laws and regulations. Certain of these laws and regulations impose joint and several liability, without regard to fault, for investigation and clean-up costs on current and former owners and operators of real property and persons who have disposed of or released hazardous substances into the environment. At some of the properties, there are asbestos-containing materials, or tenants routinely handle hazardous substances as part of their operations. In addition, historical operations, including the presence of underground storage tanks, have caused soil or groundwater contamination at or near some of the properties. Although we believe that the prior owners of the affected properties or other persons may have conducted remediation of known contamination at these properties, not all such contamination has been remediated. Unknown or unremediated contamination or the compliance with existing or new environmental or health and safety laws and regulations could require us to incur costs or liabilities that could be material. See "Item 1: Business — Environmental Regulations and Potential Liabilities."

We may be unable to complete acquisitions and successfully operate acquired properties. We continually evaluate the market of available properties and may continue to acquire office properties and undeveloped land when strategic opportunities exist. Our ability to acquire properties on favorable terms and successfully operate them is subject to the following risks:

• we may potentially be unable to acquire a desired property because of competition from other real estate investors with significant capital, including both publicly traded REITs and institutional investment funds;

• the possibility that, even if we enter into agreements for the acquisition of office properties, we may be unable to complete such acquisitions because they remain subject to customary conditions to closing including the completion of due diligence investigations to management's satisfaction;

• we may be unable to finance acquisitions on favorable terms or at all;

• we may spend more than budgeted amounts in operating costs or to make necessary improvements or renovations to acquired properties;

• we may lease acquired properties at economic lease terms different than projected;

• we may acquire properties that are subject to liabilities for which we may have limited or no recourse; and

• we may be unable to complete an acquisition after making a nonrefundable deposit and incurring certain other acquisition related costs.

If we cannot finance property acquisitions on favorable terms or operate acquired properties to meet financial expectations, our financial condition, results of operations, cash flows, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders could be adversely affected.

We may be unable to successfully complete and operate acquired, developed, and redeveloped properties. There are significant risks associated with property acquisition, development, and redevelopment including the possibility that:

• we may be unable to lease acquired, developed, or redeveloped properties at projected economic lease terms or within budgeted timeframes;

• we may not complete development or redevelopment properties on schedule or within budgeted amounts;

• we may expend funds on and devote management's time to acquisition, development, or redevelopment properties that we may not complete;

• we may encounter delays or refusals in obtaining all necessary zoning, land use, and other required entitlements, and building, occupancy, and other required governmental permits and authorizations;

• we may encounter delays, refusals, unforeseen cost increases, and other impairments resulting from third-party litigation; and

• we may fail to obtain the financial results expected from properties we acquire, develop, or redevelop.

If one or more of these events were to occur in connection with our acquired properties, undeveloped land, or development or redevelopment properties under construction, we could be required to recognize an impairment loss. These events could also

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have an adverse impact on our financial condition, results of operations, cash flow, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

While we historically have acquired, developed, and redeveloped office properties in California markets, over the past three years we have acquired ten properties in the state of Washington and may in the future acquire, develop, or redevelop properties for other uses and expand our business to other geographic regions where we expect the development or acquisition of property to result in favorable risk-adjusted returns on our investment. Presently, we do not possess the same level of familiarity with development of property types other than mixed-use, office, or with certain outside markets, which could adversely affect our ability to acquire, develop or redevelop properties or to achieve expected performance.

We could default on leases for land on which some of our properties are located. As of December 31, 2012, we owned eleven office buildings, located on various land parcels and regions, which we lease individually on a long-term basis. As of December 31, 2012, we had approximately 1.8 million aggregate rentable square feet, or 13.6% of our total stabilized portfolio, of rental space located on these leased parcels. In addition, we had ground lease obligations for the land at one redevelopment property encompassing approximately 98,000 rentable square feet. In 2012, we exercised our option to purchase this land for a purchase price of $27.5 million and we currently expect we will close the transaction in the second quarter of 2013. If we default under the terms of any particular lease, we may lose the ownership rights to the property subject to the lease. Upon expiration of a lease, we may not be able to renegotiate a new lease on favorable terms, if at all. The loss of the ownership rights to these properties or an increase of rental expense could have an adverse effect on our financial condition, results of operations, cash flow, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

Real estate assets are illiquid, and we may not be able to sell our properties when we desire. Our investments in our properties are relatively illiquid, limiting our ability to sell our properties quickly in response to changes in economic or other conditions. In addition, the Code generally imposes a 100% prohibited transaction tax on the Company on profits derived from sales of properties held primarily for sale to customers in the ordinary course of business, which effectively limits our ability to sell properties other than on a selected basis. These restrictions on our ability to sell our properties could have an adverse effect on our financial condition, results of operations, cash flow, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

We may invest in securities related to real estate, which could adversely affect our ability to pay dividends and distributions to our security holders. We may purchase securities issued by entities which own real estate and may, in the future, also invest in mortgages. In general, investments in mortgages are subject to several risks, including:

• borrowers may fail to make debt service payments or pay the principal when due;

• the value of the mortgaged property may be less than the principal amount of the mortgage note securing the property; and

• interest rates payable on the mortgages may be lower than our cost for the funds used to acquire these mortgages.

Owning these securities may not entitle us to control the ownership, operation, and management of the underlying real estate. In addition, we may have no control over the distributions with respect to these securities, which could adversely affect our ability to pay dividends and distributions to our security holders.

Future terrorist activity or engagement in war by the United States may have an adverse effect on our financial condition and operating results. Terrorist attacks in the United States and other acts of terrorism or war, may result in declining economic activity, which could harm the demand for and the value of our properties. In addition, the public perception that certain locations are at greater risk for attack, such as major airports, ports, and rail facilities, may decrease the demand for and the value of our properties near these sites. A decrease in demand could make it difficult for us to renew or re-lease our properties at these sites at lease rates equal to or above historical rates. Terrorist activities also could directly impact the value of our properties through damage, destruction, or loss, and the availability of insurance for these acts may be less, and cost more, which could adversely affect our financial condition. To the extent that our tenants are impacted by future attacks, their businesses similarly could be adversely affected, including their ability to continue to honor their existing leases.

Terrorist acts and engagement in war by the United States also may adversely affect the markets in which our securities trade and may cause further erosion of business and consumer confidence and spending and may result in increased volatility in national and international financial markets and economies. Any one of these events may cause a decline in the demand for our office leased space, delay the time in which our new or renovated properties reach stabilized occupancy, increase our operating expenses, such as those attributable to increased physical security for our properties, and limit our access to capital or increase our cost of raising capital.

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The enactment of the Dodd-Frank Wall Street Reform and Consumer Protection Act (“Dodd-Frank Act”) will subject us to substantial additional federal regulation. There are significant corporate governance and executive compensation-related requirements that have been, and will in the future be, imposed on publicly-traded companies under the Dodd-Frank Act. Several of these provisions require the SEC to adopt additional rules and regulations in these areas. For example, the Dodd-Frank Act requires publicly-traded companies to give stockholders a non-binding vote on executive compensation and so-called “golden parachute” payments, heightens certain independence standards for compensation advisers and authorizes the SEC to promulgate rules that would allow stockholders to nominate their own candidates for board seats using a registrant's proxy materials. Our efforts to comply with these requirements have resulted in, and are likely to continue to result in, an increase in expenses and a diversion of management's time from other business activities. In addition, if stockholders do not vote to approve our executive compensation practices and/or our equity plan amendments, these actions may interfere with our ability to attract and retain key personnel who are essential to our future success. Given the uncertainty associated with both the results of the existing Dodd-Frank Act requirements and the manner in which additional provisions of the Dodd-Frank Act will be implemented by various regulatory agencies and through regulations, the full extent of the impact that such requirements will have on our operations is unclear. Accordingly, the changes resulting from the Dodd-Frank Act may impact the profitability of business activities, require changes to certain business practices, or otherwise adversely affect our financial condition, results of operations, cash flows, the quoted trading price of the Company's common stock and of the Operating Partnership's publicly-traded notes and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

Our property taxes could increase due to reassessment or property tax rate changes. We are required to pay some state and local taxes on our properties. In addition, the real property taxes on our properties may increase as our properties are reassessed by taxing authorities or as property tax rates change. For example, under a current California law commonly referred to as “Proposition 13,” property tax reassessment generally occurs as a result of a “change in ownership” of a property, as specially defined for purposes of those rules. Because the property taxing authorities may not determine whether there has been a “change in ownership” or the actual reassessed value of a property for a period of time after a transaction has occurred, we may not know the impact of a potential reassessment for a considerable amount of time following a particular transaction. Therefore, the amount of property taxes we are required to pay could increase substantially from the property taxes we currently pay or have paid in the past, including on a retroactive basis. In addition, from time to time voters and lawmakers have announced initiatives to repeal or amend Proposition 13 to eliminate its application to commercial and industrial property and/or introduce split tax roll legislation. Such initiatives, if successful, would increase the assessed value and/or tax rates applicable to commercial property in California, including our office properties. An increase in the assessed value of our properties or our property tax rates could adversely impact our financial condition, results of operations, cash flows, the quoted trading price of the Company's common stock and of the Operating Partnership's publicly-traded notes and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

Our business could be adversely impacted if there are deficiencies in our disclosure controls and procedures or internal control over financial reporting. The design and effectiveness of our disclosure controls and procedures and internal control over financial reporting may not prevent all errors, misstatements or misrepresentations. While management will continue to review the effectiveness of our disclosure controls and procedures and internal control over financial reporting, there can be no guarantee that our internal control over financial reporting will be effective in accomplishing all control objectives all of the time. Deficiencies, including any material weakness, in our internal control over financial reporting which may occur in the future could result in misstatements of our results of operations, restatements of our financial statements, or otherwise adversely impact our financial condition, results of operations, cash flows, the quoted trading price of the Company's common stock and of the Operating Partnership's publicly-traded notes and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

We face risks associated with security breaches through cyber attacks, cyber intrusions or otherwise, as well as other significant disruptions of our information technology (IT) networks and related systems. We face risks associated with security breaches, whether through cyber attacks or cyber intrusions over the Internet, malware, computer viruses, attachments to e-mails, persons inside our organization or persons with access to systems inside our organization, and other significant disruptions of our IT networks and related systems. The risk of a security breach or disruption, particularly through cyber attack or cyber intrusion, including by computer hackers, foreign governments and cyber terrorists, has generally increased as the number, intensity and sophistication of attempted attacks and intrusions from around the world have increased. Our IT networks and related systems are essential to the operation of our business and our ability to perform day-to-day operations (including managing our building systems), and, in some cases, may be critical to the operations of certain of our tenants. There can be no assurance that our efforts to maintain the security and integrity of these types of IT networks and related systems will be effective or that attempted security breaches or disruptions would not be successful or damaging. A security breach or other significant disruption involving our IT networks and related systems could adversely impact our financial condition, results of operations, cash flows, the quoted trading price of the Company's common stock and of the Operating Partnership's publicly-traded notes and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders.

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Risks Related to our Organizational Structure

Loss of our key personnel could harm our operations and adversely affect the quoted trading price of our securities The leadership and performance of our executive and senior officers, particularly John B. Kilroy, Jr., President and Chief Executive Officer, Jeffrey C. Hawken, Executive Vice President and Chief Operating Officer, Eli Khouri, Executive Vice President and Chief Investment Officer, Tyler H. Rose, Executive Vice President and Chief Financial Officer, and Justin W. Smart, Executive Vice President, Development and Construction Services, play a key role in the success of the Company. They are integral to the Company's success for many reasons, including that each has a strong national or regional reputation in our industry and investment community. In addition, they have significant relationships with investors, lenders, tenants and industry personnel, which benefit the Company. Our future performance will be substantially dependent on our ability to retain and motivate these individuals. The loss or limited availability of the services of our key personnel could materially and adversely affect our business, results of operations and financial condition and could be negatively perceived in the capital markets. 

Our growth depends on external sources of capital that are outside of our control and the inability to obtain capital on terms that are acceptable to us, or at all, could adversely affect our financial condition and results of operations. The Company is required under the Code to distribute at least 90% of its taxable income (subject to certain adjustments and excluding any net capital gain), and the Operating Partnership is required to make distributions to the Company to allow the Company to satisfy these REIT distribution requirements. Because of these distribution requirements, the Operating Partnership is required to make distributions to the Company, and we may not be able to fund future capital needs, including any necessary acquisition financing, from operating cash flow. Consequently, management relies on third-party sources of capital to fund our capital needs. We may not be able to obtain financing on favorable terms or at all. Any additional debt we incur will increase our leverage. Access to third-party sources of capital depends, in part, on general market conditions and the availability of credit, the market's perception of our growth potential, our current and expected future earnings, our cash flows and cash distributions, and the quoted trading price of our securities. If we cannot obtain capital from third-party sources, our financial condition, results of operations, cash flows, the quoted trading price of our securities, and our ability to satisfy our debt service obligations and to pay dividends and distributions to our security holders may be adversely affected.

Ourcommon limited partners have limited approval rights, which may prevent us from completing a change of control transaction that may be in the best interests of all our security holders. The Company may not withdraw as the Operating Partnership's general partner or transfer its general partnership interest in the Operating Partnership without the approval of the holders of at least 60% of the units representing common limited partnership interests, including the common units held by the Company in its capacity as the Operating Partnership's general partner. In addition, the Company may not engage in a merger, consolidation, or other combination or the sale of substantially all of its assets or such similar transaction, without the approval of the holders of 60% of the common units, including the common units held by the Company in its capacity as the Operating Partnership's general partner. The right of our common limited partners to vote on these transactions could limit our ability to complete a change of control transaction that might otherwise be in the best interest of all our security holders.

In certain circumstances, our limited partners must approve our dissolution and the disposition of properties contributed by the limited partners. For as long as limited partners own at least 5% of all of the Operating Partnership's partnership interests, we must obtain the approval of limited partners holding a majority of the units representing common limited partnership interests before we may dissolve. As of December 31, 2012, limited partners owned approximately 2.4% of the Operating Partnership's partnership interests, of which 1.7% was owned by John B. Kilroy, Sr. and John B. Kilroy, Jr. In addition, we agreed to use commercially reasonable efforts to minimize the tax consequences to common limited partners resulting from the repayment, refinancing, replacement, or restructuring of debt, or any sale, exchange, or other disposition of any of our other assets. The exercise of one or more of these approval rights by the limited partners could delay or prevent us from completing a transaction that may be in the best interest of all our security holders.

The Chairman of our board of directors and our President and Chief Executive Officer each have substantial influence over our affairs.John B. Kilroy, Sr. is the Chairman of our board of directors and the father of John B. Kilroy, Jr., our President and Chief Executive Officer. Each is a member of our board of directors, and together, as of December 31, 2012, they beneficially owned approximately 2.9% of the total outstanding shares of the Company's common stock. The percentage of outstanding shares of common stock beneficially owned includes 281,210 shares of common stock, 412,936 restricted stock units that were vested and held by John B. Kilroy, Jr. at December 31, 2012, and assumes the exchange into shares of the Company's common stock of the 1,335,135 common units of the Operating Partnership held by Messrs. Kilroy (which are redeemable in exchange for, at the option of the Company, an equal number of shares of the Company's common stock).

Pursuant to the Company's charter, no stockholder may own, actually or constructively, more than 7.0% (by value or by number of shares, whichever is more restrictive) of the outstanding Company common stock without obtaining a waiver from the board of directors. The board of directors has waived the ownership limits with respect to John B. Kilroy, Sr., John B. Kilroy, Jr., members of their families, and some of their affiliated entities. These named individuals and entities may own either actually or constructively, in the aggregate, up to 19.6% of the Company's outstanding common stock, excluding Operating Partnership units

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that are exchangeable into shares of Company common stock. Consequently, Messrs. Kilroy have substantial influence on the Company, and because the Company is the manager of the Operating Partnership, on the Operating Partnership, and could exercise their influence in a manner that is not in the best interest of our stockholders, noteholders or unitholders. Also, they may, in the future, have a substantial influence on the outcome of any matters submitted to our stockholders or unitholders for approval.

There are restrictions on the ownership of the Company's capital stock that limit the opportunities for a change of control at a premium to existing security holders. Provisions of the Maryland General Corporation Law, the Company's charter and bylaws, and the Operating Partnership's partnership agreement may delay, deter, or prevent a change of control of the Company, or the removal of existing management. Any of these actions might prevent our security holders from receiving a premium for their common shares or common units over the then-prevailing market price of the shares of the Company's common stock.

In order for the Company to qualify as a REIT under the Code its stock must be beneficially owned by 100 or more persons during at least 335 days of a taxable year of 12 months (other than the first year for which an election to be a REIT has been made) or during a proportionate part of a shorter taxable year. Also, not more than 50% of the value of the outstanding shares of the Company's stock may be owned, actually or constructively, by five or fewer individuals (as defined in the Code to include certain entities) during the last half of a taxable year (other than the first year for which an election to be a REIT has been made). The Company's charter contains restrictions on the ownership and transfer of its capital stock that are intended to assist the Company in complying with these requirements and continuing to qualify as a REIT. No single stockholder may own, either actually or constructively, absent a waiver from the board of directors, more than 7.0% (by value or by number of shares, whichever is more restrictive) of the Company's outstanding common stock. Similarly, absent a waiver from the board of directors, no single holder of the Company's 6.875% Series G Cumulative Redeemable Preferred stock (the “Series G Preferred Stock”) may actually or constructively own more than 9.8% (by value or by number of shares, whichever is more restrictive) of the Company's Series G Preferred Stock; and no single holder of the Company's 6.375% Series H Cumulative Redeemable Preferred stock (the “Series H Preferred Stock”) may actually or constructively own more than 9.8% (by value or by number of shares, whichever is more restrictive) of the Company's Series H Preferred Stock.

The constructive ownership rules under the Code are complex and may cause stock owned actually or constructively by a group of related individuals and/or entities to be owned constructively by one individual or entity. As a result, the acquisition of less than the applicable ownership limit of a particular class of the Company's capital stock could, nevertheless, cause that individual or entity, or another individual or entity, to constructively own stock in excess of, and thereby subject such stock to, the applicable ownership limit.

The board of directors may waive the ownership limits if it is satisfied that the excess ownership would not jeopardize the Company's REIT status and if it believes that the waiver would be in our best interest. The board of directors has waived the ownership limits with respect to John B. Kilroy, Sr., John B. Kilroy, Jr., members of their families, and some of their affiliated entities. These named individuals and entities may own either actually or constructively, in the aggregate, up to 19.6% of the Company's outstanding common stock, excluding common units that are exchangeable into shares of common stock. The board of directors has also waived the ownership limits with respect to the initial purchasers of the 4.25% Exchangeable Senior Notes due 2014 (the “4.25% Exchangeable Notes”) and certain of their affiliated entities to beneficially own up to 9.8%, in the aggregate, of the Company's common stock in connection with hedging the capped call transactions.

If anyone acquires shares in excess of any ownership limits, the transfer to the transferee will be void with respect to the excess shares, the excess shares will be automatically transferred to a trust for the benefit of a qualified charitable organization, and the purported transferee or owner will have no rights with respect to those excess shares.

The Company's charter contains provisions that may delay, deter, or prevent a change of control transaction. The following provisions of the Company's charter may delay or prevent a change of control over us, even if a change of control might be beneficial to our security holders, deter tender offers that may be beneficial to our security holders, or limit security holders' opportunity to receive a potential premium for their shares and/or units if an investor attempted to gain shares beyond the Company's ownership limits or otherwise to effect a change of control:

• The Company's charter authorizes the board of directors to issue up to 30,000,000 shares of the Company's preferred stock, including convertible preferred stock, without stockholder approval. The board of directors may establish the preferences, rights, and other terms, including the right to vote and the right to convert into common stock any shares issued. The issuance of preferred stock could delay or prevent a tender offer or a change of control even if a tender offer or a change of control was in our security holder's interest. As of December 31, 2012, 8,000,000 shares of the Company's preferred stock were issued and outstanding, consisting of 4,000,000 shares of the Company's Series G Preferred Stock and 4,000,000 shares of the Company's Series H Preferred Stock; and

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• The Company's charter states that any director, or the entire board of directors, may be removed from office at any time, but only for cause and then only by the affirmative vote of the holders of at least two thirds of the votes of the Company's capital stock entitled to be cast in the election of directors.

The board of directors may change investment and financing policies without unitholder or stockholder approval, causing us to become more highly leveraged, which may increase our risk of default under our debt obligations.

We are not limited in our ability to incur debt. Our financing policies and objectives are determined by the board of directors. Our goal is to limit our dependence on leverage and maintain a conservative ratio of debt to total market capitalization. However, our organizational documents do not limit the amount or percentage of indebtedness, funded or otherwise, that we may incur. As of December 31, 2012, we had approximately $2.0 billion aggregate principal amount of indebtedness outstanding, which represented 34.7% of our total market capitalization. Our total debt and the liquidation value of our preferred equity as a percentage of total market capitalization was approximately 38.1% as of December 31, 2012. In addition, on January 14, 2013, the Operating Partnership issued $300.0 million of 3.8% senior unsecured notes due 2023. See “Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations —Liquidity and Capital Resources of the Company— Capitalization” for a calculation of our market capitalization. These ratios may be increased or decreased without the consent of our unitholders or stockholders. Increases in the amount of debt outstanding would result in an increase in our debt service, which could adversely affect cash flow and our ability to pay dividends and distributions to our security holders. Higher leverage also increases the risk of default on our obligations and limits our ability to obtain additional financing in the future.

We may issue additional common units and shares of capital stock without unitholder or stockholder approval, as applicable, which may dilute unitholder or stockholder investment. The Company may issue shares of our common stock, preferred stock, or other equity or debt securities without stockholder approval, including the issuance of shares to satisfy REIT dividend distribution requirements. Similarly, the Operating Partnership may offer its common or preferred units for contributions of cash or property without approval by its unitholders. Further, under certain circumstances, the Company may issue shares of our common stock in exchange for the Operating Partnership's outstanding 4.25% Exchangeable Notes. Existing security holders have no preemptive rights to acquire any of these securities, and any issuance of equity securities under these circumstances may dilute a unitholder's or stockholder's investment.

Sales of a substantial number of shares of the Company's securities, or the perception that this could occur, could result in decreasing the quoted trading price per share of the Company's common stock and of the Operating Partnership's publicly-traded notes. Management cannot predict whether future issuances of shares of the Company's common stock or the availability of shares for resale in the open market will result in decreasing the market price per share of the Company's common stock. As of December 31, 2012, 74,926,981 shares of the Company's common stock and 8,000,000 shares of the Company's preferred stock, consisting of 4,000,000 shares of Series G Preferred Stock and 4,000,000 shares of Series H Preferred Stock, were issued and outstanding.

As of December 31, 2012, the Company had reserved for future issuance the following shares of common stock: 1,826,503 shares issuable upon the exchange, at the Company's option, of the Operating Partnership's common units; 639,487 shares remained available for grant under our 2006 Incentive Award Plan (see Note 12 to our consolidated financial statements); 1,048,863 shares issuable upon settlement of RSUs; and 1,540,000 shares issuable upon exercise of outstanding options, as well as 4,800,796 shares potentially issuable under certain circumstances, in exchange for the 4.25% Exchangeable Notes. The Company has a currently effective registration statement registering 1,708,131 shares of our common stock for possible issuance to the holders of the Operating Partnership's common units. That registration statement also registers 306,808 shares of common stock held by certain stockholders for possible resale. The Company also has a currently effective registration statement registering the 4,800,796 shares of our common stock that may potentially be issued in exchange for the Operating Partnership's presently outstanding 4.25% Exchangeable Notes. Consequently, if and when the shares are issued, they may be freely traded in the public markets.

Risks Related to Taxes and the Company's Status as a REIT

Loss of the Company's REIT status would have significant adverse consequences to us and the value of the Company's common stock. The Company currently operates in a manner that is intended to allow it to qualify as a REIT for federal income tax purposes under the Code. If the Company were to lose its REIT status, the Company would face adverse tax consequences that would substantially reduce the funds available for distribution to its stockholders for each of the years involved because:

• the Company would not be allowed a deduction for dividends paid to its stockholders in computing the Company's taxable income and would be subject to federal income tax at regular corporate rates;

• the Company could be subject to the federal alternative minimum tax and possibly increased state and local taxes; and

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• unless entitled to relief under statutory provisions, the Company could not elect to be taxed as a REIT for four taxable years following the year during which the Company was disqualified.

In addition, if the Company failed to qualify as a REIT, it would not be required to make distributions to its stockholders. As a result of all these factors, the Company's failure to qualify as a REIT also could impair our ability to expand our business and raise capital and could adversely affect the value and quoted trading price of the Company's common stock.

Qualification as a REIT involves the application of highly technical and complex Code provisions for which there are only limited judicial and administrative interpretations. The complexity of these provisions and of the applicable Treasury regulations that have been promulgated under the Code is greater in the case of a REIT that, like the Company, holds its assets through a partnership. The determination of various factual matters and circumstances not entirely within our control may affect the Company's ability to continue to qualify as a REIT. For example, to qualify as a REIT, at least 95% of the Company's gross income in any year must be derived from qualifying sources. Also, the Company must make distributions to its stockholders aggregating annually at least 90% of the Company's net taxable income (excluding any net capital gains). In addition, legislation, new regulations, administrative interpretations, or court decisions may adversely affect the Company's security holders or the Company's ability to qualify as a REIT for federal income tax purposes or the desirability of an investment in a REIT relative to other investments. Although management believes that we are organized and operate in a manner to permit the Company to continue to qualify as a REIT, we cannot provide assurances that the Company has qualified or will continue to qualify as a REIT for tax purposes. We have not requested and do not plan to request a ruling from the IRS regarding the Company's qualification as a REIT.

To maintain the Company's REIT status, we may be forced to borrow funds during unfavorable market conditions. To qualify as a REIT, the Company generally must distribute to its stockholders at least 90% of the Company's net taxable income each year (excluding any net capital gains), and the Company will be subject to regular corporate income taxes to the extent that it distributes less than 100% of its net taxable income each year. In addition, the Company will be subject to a 4% nondeductible excise tax on the amount, if any, by which distributions it pays in any calendar year are less than the sum of 85% of its ordinary income, 95% of its net capital gains, and 100% of its undistributed income from prior years. To maintain the Company's REIT status and avoid the payment of federal income and excise taxes, the Operating Partnership may need to borrow funds and distribute or loan the proceeds to the Company so it can meet the REIT distribution requirements even if the then-prevailing market conditions are not favorable for these borrowings. These borrowing needs could result from differences in timing between the actual receipt of income and inclusion of income for federal income tax purposes, or the effect of nondeductible capital expenditures, the creation of reserves, or required debt or amortization payments.

If a transaction intended to qualify as a Section 1031 Exchange is later determined to be taxable, we may face adverse consequences. From time to time we dispose of properties in transactions that are intended to qualify as Section 1031 Exchanges. If the qualification of a transaction as a Section 1031 Exchange is successfully challenged and determined to be currently taxable, we generally would be required to pay taxes on any gain recognized upon the disposition of the property, including any interest and penalties, for the particular year in question, to the extent such amounts were not otherwise distributed to our stockholders. In such case, we would have less cash available to distribute to our stockholders and may be required to borrow funds in unfavorable conditions in order to pay such amounts. In addition, we may be required to amend our tax returns for the applicable year in question, including any information reports we sent to our stockholders.

Dividends payable by REITs, including us, generally do not qualify for the reduced tax rates available for some dividends. “Qualified dividends” payable to U.S. stockholders that are individuals, trusts and estates generally are subject to tax at preferential rates. Subject to limited exceptions, dividends payable by REITs are not eligible for these reduced rates and are taxable at ordinary income tax rates. The more favorable rates applicable to regular corporate qualified dividends could cause investors who are individuals, trusts and estates to perceive investments in REITs to be relatively less attractive than investments in the stocks of non-REIT corporations that pay dividends, which could adversely affect the value of the shares of REITs, including the shares of our capital stock.

The tax imposed on REITs engaging in “prohibited transactions” may limit our ability to engage in transactions which would be treated as sales for federal income tax purposes. A REIT's net income from prohibited transactions is subject to a 100% penalty tax. In general, prohibited transactions are sales or other dispositions of property, other than foreclosure property, held primarily for sale to customers in the ordinary course of business. Although we do not intend to hold any properties that would be characterized as held for sale to customers in the ordinary course of our business, unless a sale or disposition qualifies under certain statutory safe harbors, such characterization is a factual determination and no guarantee can be given that the IRS would agree with our characterization of our properties or that we will always be able to make use of the available safe harbors.

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Complying with REIT requirements may cause us to forego otherwise attractive opportunities or liquidate otherwise attractive investments. To qualify as a REIT for federal income tax purposes, we must continually satisfy tests concerning, among other things, the sources of our income, the nature and diversification of our assets, the amounts we distribute to our stockholders and the ownership of our capital stock. If we fail to comply with one or more of the asset tests at the end of any calendar quarter, we must correct the failure within 30 days after the end of the calendar quarter or qualify for certain statutory relief provisions to avoid losing our REIT qualification and suffering adverse tax consequences. In order to meet these tests, we may be required to forego investments we might otherwise make or to liquidate otherwise attractive investments. Thus, compliance with the REIT requirements may hinder our performance and reduce amounts available for distribution to our stockholders.

Legislative or regulatory action could adversely affect us. In recent years, numerous legislative, judicial and administrative changes have been made to the federal income tax laws applicable to investments in REITs and similar entities. Additional changes to tax laws are likely to continue to occur in the future, and any such changes may impact our ability to qualify as a REIT, our tax treatment as a REIT or the tax treatment of our stockholders.

ITEM 1B. UNRESOLVED STAFF COMMENTS

None.

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ITEM 2. PROPERTIES

General

As of December 31, 2012, our stabilized portfolio of properties was comprised of the following office properties.

	Number of Buildings	Rentable Square Feet	Number of Tenants	Percentage Occupied at December 31, 2012
Office Properties	114	13,249,780	530	92.8	%

During the fourth quarter of 2012 we disposed of our entire portfolio of industrial properties and, as a result, no longer owned any industrial properties at December 31, 2012 (see Note 17 to our consolidated financial statements included in this report for additional information).

Our stabilized portfolio includes all of our properties with the exception of undeveloped land, development and redevelopment properties currently under construction or committed for construction, “lease-up” properties and properties held-for-sale. We define “lease-up” properties as properties we recently developed or redeveloped that have not yet reached 95% occupancy and are within one year following cessation of major construction activities. We define redevelopment properties as those projects for which we expect to spend significant development and construction costs on existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. Our stabilized portfolio also excludes our future development pipeline, which is comprised of nine potential development sites, including one office property moved from the stabilized portfolio to the development pipeline in the fourth quarter of 2012, representing 118.5 gross acres of undeveloped land.

As of December 31, 2012, the following properties were excluded from our stabilized portfolio:

	Number of Properties	Estimated Rentable Square Feet (1)
Development properties under construction	4	1,416,000
Redevelopment properties under construction	1	410,000
Lease-up properties	1	98,000

________________________

(1) Estimated rentable square feet upon completion.

As of December 31, 2012, all of our properties and development and redevelopment projects are owned and all of our business is currently conducted in the state of California with the exception of ten office properties located in the state of Washington. We own all of our properties through the Operating Partnership and the Finance Partnership. All our properties are held in fee, except for the 11 office buildings that are held subject to long-term ground leases for the land (See Note 15 to our consolidated

financial statements included in this report for additional information regarding our ground lease obligations). We had no properties held-for-sale as of December 31, 2012.

In general, the office properties are leased to tenants on a full service gross, modified gross or triple net basis. Under a full service gross lease, we are obligated to pay the tenant’s proportionate share of real estate taxes, insurance, and operating expenses up to the amount incurred during the tenant’s first year of occupancy (“Base Year”) or a negotiated amount approximating the tenant’s pro- rata share of real estate taxes, insurance, and operating expenses (“Expense Stop”). The tenant pays its pro-rata share of increases in expenses above the Base Year or Expense Stop. A modified gross lease is similar to a full service gross lease, except tenants are obligated to pay their proportionate share of certain operating expenses, usually electricity, directly to the service provider. In addition, some office properties, primarily in the greater Seattle region, are leased to tenants on a triple net basis, pursuant to which the tenants pay their proportionate share of real estate taxes, operating costs, and utility costs.

We believe that all of our properties are well maintained and do not require significant capital improvements. As of December 31, 2012, we managed all of our properties through internal property managers.

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Office Properties

The following table sets forth certain information relating to each of the stabilized office properties owned as of December 31, 2012.

Property Location	No. of Buildings	Year Built/ Renovated	Rentable Square Feet	Percentage Occupied at 12/31/12(1)		Annualized Base Rent($000’s)(2)		Annualized Rent Per Square Foot(2)
Los Angeles and Ventura Counties
23925 Park Sorrento, Calabasas, California	1	2001	11,789	100.0	%	$	421	$	35.71
23975 Park Sorrento, Calabasas, California	1	2002	100,592	93.1	%	3,162		34.74
24025 Park Sorrento, Calabasas, California	1	2000	102,264	74.9	%	2,821		36.81
26541 Agoura Road Calabasas, California	1	1988	90,156	100.0	%	1,628		18.06
2240 E. Imperial Highway, El Segundo, California	1	1983/2008	122,870	100.0	%	4,458		36.28
2250 E. Imperial Highway, El Segundo, California	1	1983	298,728	100.0	%	10,144		34.29
2260 E. Imperial Highway, El Segundo, California	1	1983/2012	298,728	100.0	%	10,405		34.83
909 Sepulveda Blvd., El Segundo, California	1	1972/2005	241,607	89.8	%	5,609		26.27
999 Sepulveda Blvd., El Segundo, California	1	1962/2003	128,504	94.4	%	2,768		24.40
3750 Kilroy Airport Way, Long Beach, California(4)	1	1989	10,457	86.1	%	99		18.17
3760 Kilroy Airport Way, Long Beach, California	1	1989	165,278	92.7	%	4,379		28.85
3780 Kilroy Airport Way, Long Beach, California	1	1989	219,745	92.2	%	5,589		28.15
3800 Kilroy Airport Way, Long Beach, California	1	2000	192,476	100.0	%	5,538		28.77
3840 Kilroy Airport Way, Long Beach, California	1	1999	136,026	100.0	%	4,915		36.13
3900 Kilroy Airport Way, Long Beach, California	1	1987	126,840	90.9	%	2,588		23.62
12100 W. Olympic Blvd., Los Angeles, California	1	2003	150,167	92.3	%	5,392		38.90
12200 W. Olympic Blvd., Los Angeles, California	1	2000	150,302	99.7	%	4,504		39.39
12233 W. Olympic Blvd., Los Angeles, California(21)	1	1980/2011	151,029	96.8	%	2,580		48.18
12312 W. Olympic Blvd, Los Angeles, California(3)	1	1950/1997	78,000	100.0	%	1,475		18.91
6255 W. Sunset Blvd, Los Angeles, California	1	1971/1999	321,883	85.2	%	7,911		30.26
1633 26th Street, Santa Monica, California	1	1972/1997	44,915	100.0	%	1,271		28.30
2100/2110 Colorado Avenue, Santa Monica, California	3	1992/2009	102,864	100.0	%	3,846		37.39
3130 Wilshire Blvd., Santa Monica, California	1	1969/1998	88,339	76.5	%	2,329		34.48
501 Santa Monica Blvd., Santa Monica, California	1	1974	73,115	85.1	%	2,201		40.31
2829 Townsgate Road, Thousand Oaks, California	1	1990	81,067	90.6	%	1,977		27.46
Subtotal/Weighted Average— Los Angeles and Ventura Counties	27		3,487,741	94.0	%	98,010		31.66
San Diego County
12225 El Camino Real, Del Mar, California(5)	1	1998	60,148	73.4	%	1,472		33.36

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Property Location	No. of Buildings	Year Built/ Renovated	Rentable Square Feet	Percentage Occupied at 12/31/12(1)		Annualized Base Rent($000’s)(2)	Annualized Rent Per Square Foot(2)
12235 El Camino Real, Del Mar, California(5)	1	1998	54,673	81.0	%	1,608	36.31
12340 El Camino Real, Del Mar, California(5)	1	2002	87,405	86.9	%	3,276	43.14
12390 El Camino Real, Del Mar, California(5)	1	2000	72,332	100.0	%	3,069	42.43
12348 High Bluff Drive, Del Mar, California(5)	1	1999	38,710	82.0	%	1,123	35.38
12400 High Bluff Drive, Del Mar, California(5)	1	2004	208,464	100.0	%	9,897	47.48
3579 Valley Centre Drive, Del Mar, California(12)	1	1999	52,375	79.0	%	1,572	37.99
3611 Valley Centre Drive, Del Mar, California(20)	1	2000	130,178	80.0	%	4,373	44.79
3661 Valley Centre Drive, Del Mar, California(5)	1	2001	129,752	99.4	%	3,870	32.53
3721 Valley Centre Drive, Del Mar, California(5)	1	2003	114,780	100.0	%	3,767	32.82
3811 Valley Centre Drive, Del Mar, California(6)	1	2000	112,067	100.0	%	5,199	46.39
6200 Greenwich Drive, Governor Park, California(6)	1	1999	71,000	100.0	%	1,704	24.00
6220 Greenwich Drive, Governor Park , California(5)	1	1996	141,214	100.0	%	4,286	30.35
15051 Avenue of Science, I-15 Corridor, California(6)	1	2002	70,617	—	%	—	—
15073 Avenue of Science, I-15 Corridor, California(6)	1	2002	46,759	—	%	—	—
15231 Avenue of Science, I-15 Corridor, California(13)	1	2005	65,638	100.0	%	1,331	20.28
15253 Avenue of Science, I-15 Corridor, California(6)	1	2005	37,437	100.0	%	610	16.29
15333 Avenue of Science, I-15 Corridor, California(25)	1	2006	78,880	46.4	%	765	20.89
15378 Avenue of Science, I-15 Corridor, California(22)	1	1990	68,910	61.8	%	660	15.49
15435 Innovation Drive, I-15 Corridor, California(5)	1	2000	49,863	100.0	%	1,243	24.93
15445 Innovation Drive, I-15 Corridor, California(5)	1	2000	51,500	100.0	%	1,318	25.59
13280 Evening Creek Drive South, I-15 Corridor, California(5)	1	2008	41,665	67.0	%	598	21.41
13290 Evening Creek Drive South, I-15 Corridor, California	1	2008	61,176	—	%	—	—
13480 Evening Creek Drive North, I-15 Corridor, California(5)	1	2008	149,817	100.0	%	7,779	51.92
13500 Evening Creek Drive North, I-15 Corridor, California(5)	1	2004	147,533	100.0	%	6,280	42.57
13520 Evening Creek Drive North, I-15 Corridor, California(5)	1	2004	141,129	92.4	%	4,648	36.48
7525 Torrey Santa Fe, 56 Corridor, California(6)	1	2007	103,979	100.0	%	3,012	28.97
7535 Torrey Santa Fe, 56 Corridor, California(6)	1	2007	130,243	100.0	%	3,693	28.35
7545 Torrey Santa Fe, 56 Corridor, California(6)	1	2007	130,354	100.0	%	3,609	27.69
7555 Torrey Santa Fe, 56 Corridor, California(6)	1	2007	101,236	100.0	%	3,175	31.36
2355 Northside Drive, Mission Valley, California(5)	1	1990	53,610	84.5	%	1,235	27.25
2365 Northside Drive, Mission Valley, California(5)	1	1990	91,260	86.8	%	2,281	28.81

25

Property Location	No. of Buildings	Year Built/ Renovated	Rentable Square Feet	Percentage Occupied at 12/31/12(1)		Annualized Base Rent($000’s)(2)	Annualized Rent Per Square Foot(2)
2375 Northside Drive, Mission Valley, California(5)	1	1990	51,516	100.0	%	1,429	28.84
2385 Northside Drive, Mission Valley, California(5)	1	2008	88,795	76.5	%	2,135	31.43
2305 Historic Decatur Road, Point Loma, California(16)	1	2009	103,900	100.0	%	3,980	38.31
10020 Pacific Mesa Blvd, Sorrento Mesa, California(3)	1	2007	318,000	100.0	%	7,683	24.16
4910 Directors Place, Sorrento Mesa, California(6)	1	2009	50,925	49.9	%	963	37.90
4921 Directors Place, Sorrento Mesa, California(5)	1	2008	56,136	100.0	%	1,347	24.00
4939 Directors Place, Sorrento Mesa, California(6)	1	2002	60,662	100.0	%	2,276	37.52
4955 Directors Place, Sorrento Mesa, California(6)	1	2008	76,246	100.0	%	2,881	37.79
5005 Wateridge Vista Drive, Sorrento Mesa, California(26)	1	1999	61,460	—	%	—	—
5010 Wateridge Vista Drive, Sorrento Mesa, California(6)	1	1999/2012	111,318	100.0	%	3,552	31.91
10770 Wateridge Circle, Sorrento Mesa, California(18)	1	1989	174,310	97.5	%	3,073	18.08
6055 Lusk Avenue, Sorrento Mesa, California(3)	1	1997	93,000	100.0	%	1,554	16.71
6260 Sequence Drive, Sorrento Mesa, California(6)	1	1997	130,536	100.0	%	1,269	9.72
6290 Sequence Drive, Sorrento Mesa, California(6)	1	1997	90,000	100.0	%	2,098	23.31
6310 Sequence Drive, Sorrento Mesa, California(6)	1	2000	62,415	100.0	%	1,133	18.15
6340 Sequence Drive, Sorrento Mesa, California(6)	1	1998	66,400	100.0	%	1,341	20.20
6350 Sequence Drive, Sorrento Mesa, California	1	1998	132,600	100.0	%	2,507	18.91
10390 Pacific Center Court, Sorrento Mesa, California(6)	1	2002	68,400	100.0	%	2,771	40.51
10394 Pacific Center Court, Sorrento Mesa, California(6)	1	1995	59,630	100.0	%	1,077	18.06
10398 Pacific Center Court, Sorrento Mesa, California(6)	1	1995	43,645	100.0	%	698	15.99
10421 Pacific Center Court, Sorrento Mesa, California(17)	1	1995/2002	75,899	100.0	%	1,076	14.18
10445 Pacific Center Court, Sorrento Mesa, California(6)	1	1995	48,709	100.0	%	1,029	21.13
10455 Pacific Center Court, Sorrento Mesa, California	1	1995	90,000	100.0	%	1,112	12.36
5717 Pacific Center Blvd, Sorrento Mesa, California(3)	1	2001/2005	67,995	100.0	%	1,503	22.10
4690 Executive Drive, UTC, California(8)	1	1999	47,212	100.0	%	1,134	24.02
9785 Towne Center Drive, UTC, California(3)	1	1999	75,534	100.0	%	1,374	18.19
9791 Towne Center Drive, UTC, California(3)	1	1999	50,466	100.0	%	916	18.15
Subtotal/Weighted Average— San Diego County	59		5,250,413	90.7	%	139,364	29.39
Orange County
8101 Kaiser Blvd. Anaheim, California	1	1988	59,790	61.0	%	848	23.26
2211 Michelson, Irvine, California(19)	1	2007	271,556	94.0	%	9,704	38.51

26

Property Location	No. of Buildings	Year Built/ Renovated	Rentable Square Feet	Percentage Occupied at 12/31/12(1)		Annualized Base Rent($000’s)(2)		Annualized Rent Per Square Foot(2)
111 Pacifica, Irvine Spectrum, California	1	1991	67,496	100.0	%	1,377		21.77
999 Town & Country, Orange, California	1	1977/2009	98,551	100.0	%	2,919		29.62
Subtotal/Weighted Average— Orange County	4		497,393	92.0	%	14,848		32.98
San Francisco
4100 Bohannon Drive, Menlo Park, California(6)	1	1985	46,614	100.0	%	1,719		36.88
4200 Bohannon Drive, Menlo Park, California(6)	1	1987	46,255	100.0	%	1,573		39.78
4300 Bohannon Drive, Menlo Park, California(6)	1	1988	62,920	41.7	%	876		33.42
4400 Bohannon Drive, Menlo Park, California(6)	1	1988	46,255	84.2	%	1,159		32.62
4500 Bohannon Drive, Menlo Park, California(6)	1	1990	62,920	100.0	%	2,041		32.44
4600 Bohannon Drive, Menlo Park, California(6)	1	1990	46,255	71.2	%	1,297		39.39
4700 Bohannon Drive, Menlo Park, California(6)	1	1989	62,920	100.0	%	2,275		36.16
303 Second Street, San Francisco, California	1	1988	740,047	95.5	%	26,232		37.26
100 First Street, San Francisco, California	1	1988	466,490	98.3	%	19,118		42.80
250 Brannan Street, San Francisco, California(5)	1	1907/2001	92,948	100.0	%	3,983		42.85
201 Third Street, San Francisco, California	1	1983	332,893	99.5	%	13,024		40.40
301 Brannan Street, San Francisco, California(5)	1	1909/1989	74,430	100.0	%	3,024		40.63
4040 Civic Center, San Rafael, California	1	1979/1994	130,237	98.1	%	2,528		20.30
599 Mathilda, Sunnyvale, California	1	2000	75,810	100.0	%	2,201		29.03
Subtotal/Weighted Average— San Francisco	14		2,286,994	95.5	%	81,050		37.74
Greater Seattle
601 108th Avenue NE, Bellevue, Washington(23)	1	2000	488,470	90.4	%	11,851		27.24
10900 NE 4th Street, Bellevue, Washington	1	1983	416,755	90.5	%	12,691		33.68
10220 NE Points Drive, Kirkland, Washington(3)	1	1987	49,851	96.3	%	1,222		25.71
10230 NE Points Drive, Kirkland, Washington(3)	1	1988	98,982	100.0	%	2,661		27.28
10210 NE Points Drive, Kirkland, Washington(3)	1	1990	84,641	69.2	%	1,428		24.38
3933 Lake Washington Blvd NE, Kirkland, Washington(3)	1	1993	46,450	100.0	%	1,209		26.03
15050 N.E. 36th Street, Redmond, Washington(3)	1	1998	122,103	100.0	%	3,130		25.63
837 N. 34th Street, Lake Union, Washington(3)	1	2008	111,580	100.0	%	2,694		24.14
701 N. 34th Street, Lake Union, Washington(24)	1	1998	138,995	98.7	%	2,541		18.51
801 N. 34th Street, Lake Union, Washington(3)	1	1998	169,412	100.0	%	4,423		26.11
Subtotal/Weighted Average— Greater Seattle	10		1,727,239	93.3	%	43,850		27.37
TOTAL/WEIGHTED AVERAGE	114		13,249,780	92.8	%	$	377,122	$	31.33

27

_________________

(1) Based on all leases at the respective properties in effect as of December 31, 2012. Includes month-to-month leases as of December 31, 2012.

(2) Annualized base rental revenue includes the impact of straight-lining rent escalations and the amortization of free rent periods and excludes the impact of the following: amortization of deferred revenue related tenant-funded tenant improvements, amortization of above/below market rents, amortization for lease incentives due under existing leases, and expense reimbursement revenue. Excludes month-to-month leases and vacant space as of December 31, 2012.

(3) For these properties, the leases are written on a triple net basis.

(4) For this property, leases of approximately 5,000 rentable square feet are written on a modified gross basis, and a lease of approximately 2,000 rentable square feet is written on a full service gross basis.

(5) For these properties, the leases are written on a modified gross basis.

(6) For these properties, the leases are written on a modified net basis.

(7) For this property, a lease of approximately 20,000 rentable square feet is written on a modified net basis, and leases of approximately 17,000 rentable square feet are written on a modified gross basis. The remaining 6,000 rentable square feet is currently being marketed for lease.

(8) For this property, leases of approximately 19,000 rentable square feet are written on a modified net basis, and leases of approximately 28,000 rentable square feet are written on a modified gross basis.

(9) For this property, leases of approximately 15,000 rentable square feet are written on a full service gross basis, leases of approximately 42,000 rentable square feet are written on a triple net basis, and leases of approximately 18,000 rentable square feet are written on a modified net basis.

(10) For this property, a lease of approximately 15,000 rentable square feet is written on a modified gross basis, and a lease of approximately 56,000 rentable square feet is written on a triple net basis.

(11) For these properties, leases of approximately 142,000 rentable square feet are written on a modified net basis, and a lease of approximately 37,000 rentable square feet is written on a modified gross basis.

(12) For this property, a lease of approximately 41,000 rentable square feet is written on a modified gross basis. The remaining 11,000 rentable square feet is currently being marketed for lease.

(13) For this property, a lease of approximately 47,000 rentable square feet is written on a modified net basis. A lease of approximately 18,000 rentable square feet is written on a modified gross basis.

(14) For this property, leases of approximately 30,000 rentable square feet are written on a modified gross basis.

(15) For this property, a lease of approximately 70,000 rentable square feet is written on a modified net basis, and a lease of approximately 15,000 rentable square feet is written on a triple net basis.

(16) For this property, leases of approximately 82,000 rentable square feet are written on a modified gross basis, and a lease of approximately 22,000 rentable square feet is written on a gross basis.

(17) For this property, leases of approximately 76,000 rentable square feet are written on a modified net basis.

(18) For this property, leases of approximately 123,000 rentable square feet are written on a modified net basis, and leases of 47,000 rentable square feet are written on a modified gross basis.

(19) For this property, leases of approximately 217,000 rentable square feet are written on a direct expense stop basis, and leases of 38,000 rentable square feet are written on a full service gross basis.

(20) For this property, leases of approximately 104,000 rentable square feet are written on a modified gross basis. The remaining 26,000 rentable square feet is currently being marketed for lease.

(21) For this property, leases of approximately 105,000 rentable square feet are written on a full service gross basis, and leases of 41,000 rentable square feet are written on a modified gross basis.

(22) For this property, a lease of approximately 69,000 rentable square feet is written on a modified net basis, and a lease of approximately 43,000 rentable square feet is written on a modified gross basis.

(23) For this property, a lease of approximately 360,000 rentable square feet are written on a triple net basis, and leases of approximately 73,000 rentable square feet are written on a full service gross basis.

(24) For this property, a lease of approximately 118,000 rentable square feet are written on a triple net basis, and leases of approximately 20,000 rentable square feet are written on a modified net basis.

(25) For this property, leases of approximately 37,000 rentable square feet are written on a modified gross basis. Leases of approximately 38,000 rentable square feet were executed with two tenants during the fourth quarter of 2012. The new leases are expected to commence in the first and third quarters of 2013.

(26) For this property, a lease of approximately 61,000 rentable square feet was executed with one tenant during the fourth quarter of 2012. The new lease is expected to commence in the third quarter of 2013.

Completed and In-Process Redevelopment Projects

During the year ended December 31, 2012, we completed the following redevelopment projects, which were added to our stabilized portfolio of operating properties:

	Construction Period
Completed Redevelopment Projects	Start Date	Completion Date	Rentable Square Feet	% Leased
2260 E. Imperial Highway El Segundo, California (1)	3Q 2010	4Q 2012	299,000	100	%
5010 Wateridge Vista Drive Sorrento Mesa, California	3Q 2011	4Q 2012	111,000	100	%
			410,000	100	%

_______________________

(1)Cash rent for this property commenced in December 2012. Completion of remaining tenant improvements and physical occupancy are expected to continue through April 2013.

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As of December 31, 2012, we had the following redevelopment projects in lease up or under construction.

	Estimated Construction Period
In-Process Redevelopment Projects	Start Date	Estimated Compl. Date	Estimated Stabilization Date (1)	Estimated Rentable Square Feet	% Leased
Projects In Lease-Up (2)
3880 Kilroy Airport Way Long Beach, California (3)	3Q 2011	4Q 2012	4Q 2013	98,000	50	%
Under Construction
360 Third Street San Francisco, California (4)(5)	4Q 2011	1Q 2013	1Q 2014	410,000	75	%
				508,000	70	%

_______________________

(1)Based on management's estimation of the earlier of stabilized occupancy (95%) or one year from the date of substantial completion.

(2) Lease-up properties represent properties recently redeveloped that have not reached 95% occupancy and are within one year following cessation of major construction activities.

(3) This property was 50% leased prior to any redevelopment activity, which occurred in two phases. Redevelopment on the first half was completed during the second quarter of

2012, and the tenant has taken occupancy of this space. Redevelopment on the second half was completed in the fourth quarter of 2012.

(4) Approximately 91% of this project is being redeveloped because approximately 9% of the project was leased and occupied by an existing tenant upon acquisition in December

2011. In July 2012, approximately 17% of the building was completed and the tenant has taken occupancy of the space. The remaining 74% of the building remains under

redevelopment. Redevelopment costs are capitalized only on the portion of the building that is under redevelopment and not occupied by tenants.

(5) During the fourth quarter of 2012, the Company exercised its option to acquire the land underlying the current ground lease for $27.5 million. We currently expect that the

transaction will close in the second quarter of 2013.

In-Process and Future Development Pipeline and Other Land Holdings

The following table sets forth certain information relating to our in-process development pipeline as of December 31, 2012.

		Estimated Construction Period
In-Process Development Pipeline	Location	Start Date	Estimated Compl. Date	Estimated Stabilization Date (1)	Estimated Rentable Square Feet	% Leased
San Francisco Bay Area
690 E. Middlefield Road	Mountain View	2Q 2012	1Q 2015	1Q 2015	341,000	100%
331 Fairchild Drive	Mountain View	4Q 2012	4Q 2013	4Q 2013	88,000	100%
350 Mission Street (2)	San Francisco	4Q 2012	1Q 2015	4Q 2015	400,000	100%
555 N. Mathilda Avenue	Sunnyvale	4Q 2012	3Q 2014	3Q 2014	587,000	100%
					1,416,000	100%

_______________________________________

(1) Based on management's estimation of the earlier of stabilized occupancy (95%) or one year from the date of substantial completion.

(2) Estimated rentable square feet reflects existing entitlements for 27-story office tower. The Company is currently pursuing entitlements to increase this project to a 30-story office

tower, which would increase the estimated rentable square feet and total estimated investment.

29

The following table sets forth certain information relating to our future development pipeline as of December 31, 2012.

Project	Location	Estimated Rentable Square Feet
Future Development Pipeline
San Francisco Bay Area
333 Brannan Street	San Francisco	170,000
Los Angeles
Columbia Square (1)	Hollywood	600,000
San Diego
9455 Towne Centre Drive (2)	San Diego	150,000
Carlsbad Oaks—Lots 4, 5, 7 & 8	Carlsbad	288,000
Pacific Corporate Center—Lot 8	Sorrento Mesa	170,000
Rancho Bernardo Corporate Center	I-15 Corridor	320,000 - 1,000,000
One Paseo (3)	Del Mar	500,000
Santa Fe Summit—Phase II and III	56 Corridor	600,000
Sorrento Gateway—Lot 2	Sorrento Mesa	80,000
Subtotal		2,108,000 - 2,788,000

_______________________________________

(1) The Company is planning to redevelop an existing building encompassing approximately 100,000 rentable square feet and develop a mixed-use plan encompassing approximately 500,000 rentable square feet, which will include office, multi-family and retail components.

(2) The Company is planning to demolish the existing two-story 45,195 rentable square foot office building at this site and pursue entitlements to build a new 5-story 150,000 rentable square foot office building.

(3) Estimated rentable square feet reflects existing office entitlements. The Company is currently pursuing mixed-use entitlements for this project which would increase the estimated rentable square feet.

The following table sets forth certain information about our other land holdings as of December 31, 2012.

Other Land Holdings
Project	Gross Site Acreage
17150 Von Karman Irvine, California	8.5

During the fourth quarter of 2011, the Company completed demolition of the industrial building at 17150 Von Karman. Simultaneously, the Company successfully obtained entitlements to reposition this site for residential use in preparation of a possible land sale. The Company's ultimate decision to sell this site and the timing of any potential future sale is dependent upon market conditions and other factors.

30

Significant Tenants

The following table sets forth information about our 15 largest tenants based upon annualized base rental revenues, as defined below, as of December 31, 2012.

Tenant Name	Annualized Base Rental Revenue(1)		Percentage of Total Annualized Base Rental Revenue(1)	Lease Expiration Date
	(in thousands)
DIRECTV, LLC	$	23,377	6.2%	September 2027
Intuit, Inc.	15,193		4.0	Various(2)
Bridgepoint Education, Inc	15,105		4.0	Various(3)
Delta Dental of California	10,275		2.7	May 2015
CareFusion Corporation (9)	9,256		2.5	August 2017
AMN Healthcare, Inc.	8,192		2.2	July 2018
Adobe Systems, Inc. (9)	6,557		1.7	Various(4)
Fish & Richardson P.C.	6,071		1.6	October 2018
Wells Fargo (9)	5,346		1.4	Various(5)
Scripps Health	5,199		1.4	June 2021
BP Biofuels	5,128		1.4	Various(6)
Lucile Salter Packard Children's Hospital at Stanford	5,109		1.4	Various(7)
Epson America, Inc.	4,915		1.3	October 2019
Scan Health Plan (9)	4,505		1.2	June 2015
Avnet, Inc.	4,163		1.1	Various(8)
Total	$	128,391	34.1%

_______________________________________

(1) Represents annualized contractual base rent calculated on a straight-line basis in accordance with GAAP, excluding the above/below market rent amortization and expense reimbursement revenue, for leases from which rental revenue is being recognized by us as of December 31, 2012. 

(2) The Intuit Inc. leases, which contribute $1.7 million and $13.5 million expire in December 2012 and August 2017, respectively.

(3) The Bridgepoint Education Inc. leases, which contribute $1.0 million, $6.3 million and $7.8 million expire in February 2017, July 2018 and September 2018, respectively.

(4) The Adobe Systems Inc. leases, which contribute $1.6 million and $5.0 million expire in May 2013 and July 2020, respectively.

(5) The Wells Fargo leases, which contribute $0.05 million, $0.1 million, $1.0 million, $0.3 million, $0.4 million, $1.4 million, $2.0 million, $0.05 million and $0.1 million expire in March 2013, January 2014, November 2014, August 2015, July 2016, September 2016, September 2017, February 2018 and February 2019, respectively.

(6) The BP Biofuel leases, which contribute $2.8 million and $2.3 million expire in November 2015 and March 2017, respectively.

(7) The Lucile Salter Packard Children's Hospital at Stanford leases, which contribute $0.4 million and $4.7 million expire in November 2015 and September 2020, respectively.

(8) The Avnet Inc. leases, which contribute $3.8 million and $0.4 million expire in February 2013 and January 2018, respectively.

(9) The Company has entered into leases with various affiliates of the tenant name listed above.

31

The following pie chart sets forth the composition of our tenant base by industry and as a percentage of our annualized base rental revenue based on the Standard Industrial Classifications as of December 31, 2012.

32

Lease Expirations

The following table sets forth a summary of our lease expirations for each of the next ten years beginning with 2013, assuming that none of the tenants exercise renewal options or termination rights. See further discussion of our lease expirations under “Item 1A: Risk Factors”.

Lease Expirations ⁽¹⁾

Year of Lease Expiration	# of Expiring Leases	Total Square Feet	% of Total Leased Square Feet		Annualized Base Rent (000’s)(1)		% of Total Annualized Base Rent(1)		Annualized Rent per Square Foot(1)
2013	94	855,902	7.1	%	$	22,524	6.0	%	$	26.32
2014	121	1,250,019	10.4	%	36,098		9.6	%	28.88
2015	151	2,124,976	17.7	%	65,432		17.4	%	30.79
2016	74	808,217	6.7	%	21,119		5.6	%	26.13
2017	99	1,951,623	16.2	%	58,162		15.4	%	29.80
2018	52	1,281,765	10.6	%	49,569		13.1	%	38.67
2019	31	902,246	7.5	%	31,315		8.3	%	34.71
2020	30	1,200,994	10.0	%	36,562		9.7	%	30.44
2021	18	445,767	3.7	%	14,960		4.0	%	33.56
2022	8	128,076	1.1	%	5,153		1.4	%	40.23
2023 and beyond	16	1,088,198	9.0	%	36,228		9.5	%	33.29
Total(2)	694	12,037,783	100.0	%	$	377,122	100.0	%	$	31.33

_______________________

(1) Annualized base rent includes the impact of straight-lining rent escalations and the amortization of free rent periods and excludes the impact of the following:  amortization of deferred revenue related tenant-funded tenant improvements, amortization of above/below market rents, amortization for lease incentives due under existing leases, and expense reimbursement revenue.  Additionally, the underlying leases contain various expense structures including full service gross, modified gross and triple net. Amounts represent percentage of total portfolio annualized contractual base rental revenue.

(2) The information presented for all lease expiration activity reflects leasing activity through December 31, 2012 for our stabilized portfolio. For leases that have been renewed early or space that has been re-leased to a new tenant, the expiration date and annualized base rent information presented takes into consideration the renewed or re-leased lease terms. Excludes space leased under month-to-month leases, vacant space, and lease renewal options not executed as of December 31, 2012.

Secured Debt

As of December 31, 2012, the Operating Partnership had nine outstanding mortgage notes payable, which were secured by certain of our properties. Our secured debt represents an aggregate indebtedness of approximately $553.9 million. See additional information regarding our secured debt in “Item 7: Management’s Discussion and Analysis of Financial Condition and Results of Operations —Liquidity and Capital Resources—Liquidity Sources,” Notes 6 and 7 to our consolidated financial statements, and Schedule III—Real Estate and Accumulated Depreciation included with this report. Management believes that, as of December 31, 2012, the value of the properties securing the applicable secured obligations in each case exceeded the principal amount of the outstanding obligation.

ITEM 3. LEGAL PROCEEDINGS

We and our properties are subject to routine litigation incidental to our business. As of December 31, 2012, we are not a defendant in, and our properties are not subject to, any legal proceedings that we believe, if determined adversely to us, would have a material adverse effect upon our financial condition, results of operations, or cash flows.

ITEM 4. MINE SAFETY DISCLOSURES

None.

33

PART II

ITEM 5. MARKET FOR KILROY REALTY CORPORATION'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

The Company's common stock is traded on the New York Stock Exchange (“NYSE”) under the symbol “KRC.” As of the date this report was filed, there were approximately 65 registered holders of the Company's common stock. The following table illustrates the high, low, and closing prices by quarter, as well as dividends declared, during 2012 and 2011 as reported on the NYSE.

2012	High		Low		Close		Per Share Common Stock Dividends Declared
First quarter	$	46.61	$	37.92	$	46.61	$	0.3500
Second quarter	48.58		44.84		48.41		0.3500
Third quarter	49.88		44.78		44.78		0.3500
Fourth quarter	47.52		42.47		47.37		0.3500
2011	High		Low		Close		Per Share Common Stock Dividends Declared
First quarter	$	39.24	$	36.61	$	38.83	$	0.3500
Second quarter	41.94		38.04		39.49		0.3500
Third quarter	41.58		30.01		31.30		0.3500
Fourth quarter	38.57		29.25		38.07		0.3500

The Company pays distributions to common stockholders quarterly each January, April, July, and October at the discretion of the board of directors. Distribution amounts depend on our FFO, financial condition, capital requirements, the annual distribution requirements under the REIT provisions of the Code, and such other factors as the board of directors deems relevant.

MARKET FOR KILROY REALTY, L.P.'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

There is no established public trading market for the Operating Partnership’s common units. As of the date this report was filed, there were 24 holders of record of common units (including through the Company’s general partnership interest).

The following table reports the distributions per common unit declared during the years ended December 31, 2012 and 2011.

2012	Per Unit Common Unit Distribution Declared
First quarter	$	0.3500
Second quarter	0.3500
Third quarter	0.3500
Fourth quarter	0.3500
2011	Per Unit Common Unit Distribution Declared
First quarter	$	0.3500
Second quarter	0.3500
Third quarter	0.3500
Fourth quarter	0.3500

During 2012 and 2011, the operating partnership redeemed 10,000 and 5,000 common units, respectively, for the same number of shares of the Company’s common stock.

34

PERFORMANCE GRAPH

The following line graph compares the change in cumulative stockholder return on shares of the Company's common stock to the cumulative total return of the NAREIT All Equity REIT Index, the Standard & Poor’s 500 Stock Index, and the SNL REIT Office Index for the five-year period ended December 31, 2012. We include an additional index, the SNL REIT Office Index, to the performance graph since management believes it provides additional information to investors about our performance relative to a more specific peer group. The SNL REIT Office Index is a published and widely recognized index that comprises 19 office equity REITs, including us. The graph assumes the investment of $100 in us and each of the indices on December 31, 2007 and, as required by the SEC, the reinvestment of all distributions. The return shown on the graph is not necessarily indicative of future performance.

35

ITEM 6. SELECTED FINANCIAL DATA - KILROY REALTY CORPORATION     

The following tables set forth selected consolidated financial and operating data on an historical basis for the Company.  The following data should be read in conjunction with our financial statements and notes thereto and “Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations” included below in this report.

The consolidated balance sheet data as of December 31, 2012 and 2011 and the consolidated statement of operations data for the years ended December 31, 2012, 2011 and 2010 have been derived from the historical consolidated financial statements of Kilroy Realty Corporation audited by Deloitte & Touche LLP, an independent registered public accounting firm.  The consolidated balance sheet data as of December 31, 2010, 2009 and 2008 and the consolidated statement of operations data for the years ended December 31, 2009 and 2008 have been derived from the historical consolidated financial statements of Kilroy Realty Corporation and adjusted for the impact of subsequent accounting changes requiring retrospective application, if any.

Kilroy Realty Corporation Consolidated

(in thousands, except share, per share, square footage and occupancy data)

	Year Ended December 31,
	2012			2011			2010			2009			2008
Statements of Operations Data:
Total revenues from continuing operations	$	404,912		$	337,629		$	254,994		$	230,571		$	244,294
Income (loss) from continuing operations	5,447			(3,728		)	(427		)	15,569			28,181
Income from discontinued operations	271,654			71,217			20,313			22,446			18,730
Net income available to common stockholders	249,826			50,819			4,512			21,794			29,829
Per-Share Data:
Weighted average common shares outstanding-basic	69,639,623			56,717,121			49,497,487			38,705,101			32,466,591
Weighted average common shares outstanding-diluted	69,639,623			56,717,121			49,497,487			38,732,126			32,540,872
(Loss) income from continuing operations available to common stockholders per common share-basic	$	(0.24	)	(0.35		)	(0.33		)	(0.02		)	0.37
(Loss) income from continuing operations available to common stockholders per common share-diluted	$	(0.24	)	(0.35		)	(0.33		)	(0.02		)	0.37
Net income available to common stockholders per share-basic	$	3.56		0.87			0.07			0.53			0.91
Net income available to common stockholders per share-diluted	$	3.56		0.87			0.07			0.53			0.91
Dividends declared per common share	$	1.40		1.40			1.40			1.63			2.32

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	December 31,
	2012			2011			2010			2009			2008
Balance Sheet Data:
Total real estate held for investment, before accumulated depreciation and amortization	$	4,757,394		$	3,798,690		$	3,216,871		$	2,520,083		$	2,475,596
Total assets	4,616,084			3,446,795			2,816,565			2,084,281			2,102,918
Total debt	2,040,935			1,821,286			1,427,776			972,016			1,142,348
Total noncontrolling interest - preferred units(1)	—			73,638			73,638			73,638			73,638
Total preferred stock	192,411			121,582			121,582			121,582			121,582
Total equity(2)	2,235,933			1,327,482			1,117,730			883,838			714,886
Other Data:
Funds From Operations(3)	$	165,455		$	136,173		$	106,639		$	107,159		$	113,972
Cash flows provided by (used in):
Operating activities	180,724			138,256			119,827			124,965			144,481
Investing activities	(706,506		)	(634,283		)	(701,774		)	(50,474		)	(93,825		)
Financing activities	537,705			485,964			586,904			(74,161		)	(52,835		)
Property Data:
Office Properties:
Rentable square footage	13,249,780			11,421,112			10,395,208			8,708,466			8,650,126
Occupancy	92.8		%	90.1		%	87.5		%	80.6		%	86.2		%
Industrial Properties:
Rentable square footage	(4)			3,413,354			3,602,896			3,654,463			3,718,663
Occupancy	(4)			100.0		%	93.9		%	88.2		%	96.3		%

_______________________

(1) Represents the redemption value, less issuance costs of our issued and outstanding 1,500,000 Series A Preferred Units. The Series A Preferred Units were redeemed in 2012. See Note 9 in our consolidated financial statements included in this report for additional information.

(2) Includes the noncontrolling interest of the common units of the Operating Partnership.

(3) The Company calculates FFO in accordance with the White Paper on FFO approved by the Board of Governors of NAREIT. The White Paper defines FFO as net income or loss calculated in accordance with GAAP, excluding extraordinary items, as defined by GAAP, gains and losses from sales of depreciable real estate and impairment write-downs associated with depreciable real estate, plus real estate-related depreciation and amortization (excluding amortization of deferred financing costs and depreciation of non-real estate assets), and after adjustment for unconsolidated partnerships and joint ventures.

Management believes that FFO is a useful supplemental measure of the Company's operating performance. The exclusion from FFO of gains and losses from the sale of operating real estate assets allows investors and analysts to readily identify the operating results of the assets that form the core of the Company's activity and assists in comparing those operating results between periods. Also, because FFO is generally recognized as the industry standard for reporting the operations of REITs, it facilitates comparisons of operating performance to other REITs. However, other REITs may use different methodologies to calculate FFO, and accordingly, the Company's FFO may not be comparable to all other REITs.

Implicit in historical cost accounting for real estate assets in accordance with GAAP is the assumption that the value of real estate assets diminishes predictably over time. Since real estate values have historically risen or fallen with market conditions, many industry investors and analysts have considered presentations of operating results for real estate companies using historical cost accounting alone to be insufficient. Because FFO excludes depreciation and amortization of real estate assets, management believes that FFO along with the required GAAP presentations provides a more complete measurement of the Company's performance relative to its competitors and a more appropriate basis on which to make decisions involving operating, financing, and investing activities than the required GAAP presentations alone would provide.

However, FFO should not be viewed as an alternative measure of the Company's operating performance since it does not reflect either depreciation and amortization costs or the level of capital expenditures and leasing costs necessary to maintain the operating performance of the Company's properties, which are significant economic costs and could materially impact the Company's results from operations.

Noncash adjustments to arrive at FFO were as follows: noncontrolling interest in earnings of the Operating Partnership, depreciation and amortization of real estate assets, and net gain (loss) from dispositions of operating properties. For additional information, see "Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations -Non-GAAP Supplemental Financial Measure: Funds From Operations” including a reconciliation of the Company's GAAP net income available for common stockholders to FFO for the periods presented.

(4) We sold all of our industrial properties during the fourth quarter of 2012.

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SELECTED FINANCIAL DATA - KILROY REALTY, L.P.

The following tables set forth selected consolidated financial and operating data on an historical basis for the Operating Partnership. The following data should be read in conjunction with our financial statements and notes thereto and “Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations” included below in this report.

The consolidated balance sheet data as of December 31, 2012 and 2011 and the consolidated statement of operations data for the years ended December 31, 2012, 2011 and 2010 have been derived from the historical consolidated financial statements of Kilroy Realty, L.P. audited by Deloitte & Touche LLP, an independent registered public accounting firm.  The consolidated balance sheet data as of December 31, 2010, 2009 and 2008 and the consolidated statement of operations data for the years ended December 31, 2009 and 2008 have been derived from the historical consolidated financial statements of Kilroy Realty, L.P. and adjusted for the impact of subsequent accounting changes requiring retrospective application, if any.

Kilroy Realty, L.P. Consolidated

(in thousands, except unit, per unit, square footage and occupancy data)

	Year Ended December 31,
	2012			2011			2010			2009			2008
Statements of Operations Data:
Total revenues from continuing operations	$	404,912		$	337,629		$	254,994		$	230,571		$	244,294
Income (loss) from continuing operations	5,447			(3,728		)	(427		)	15,569			28,181
Income from discontinued operations	271,654			71,217			20,313			22,446			18,730
Net income available to common unitholders	255,375			51,764			4,528			22,618			31,478
Per Unit Data:
Weighted average common units outstanding-basic	71,403,258			58,437,444			51,220,618			40,436,196			34,531,779
Weighted average common units outstanding-diluted	71,403,258			58,437,444			51,220,618			40,463,221			34,606,060
(Loss) income from continuing operations available to common unitholders per common unit-basic	(0.24		)	(0.36		)	(0.33		)	(0.02		)	0.39
(Loss) income from continuing operations available to common unitholders per common unit-diluted	(0.24		)	(0.36		)	(0.33		)	(0.02		)	0.39
Net income available to common unitholders per unit-basic	3.56			0.86			0.07			0.53			0.90
Net income available to common unitholders per unit-diluted	3.56			0.86			0.07			0.53			0.90
Distributions declared per common unit	1.40			1.40			1.40			1.63			2.32

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	December 31,
	2012			2011			2010			2009			2008
Balance Sheet Data:
Total real estate held for investment, before accumulated depreciation and amortization	$	4,757,394		$	3,798,690		$	3,216,871		$	2,520,083		$	2,475,596
Total assets	4,616,084			3,446,795			2,816,565			2,084,281			2,102,918
Total debt	2,040,935			1,821,286			1,427,776			972,016			1,142,348
Series A redeemable preferred units (1)	—			73,638			73,638			73,638			73,638
Total preferred capital	192,411			121,582			121,582			121,582			121,582
Total capital (2)	2,235,933			1,327,482			1,117,730			883,838			714,886
Other Data:
Cash flows provided by (used in):
Operating activities	180,724			138,256			119,827			124,965			144,481
Investing activities	(706,506		)	(634,283		)	(701,774		)	(50,474		)	(93,825		)
Financing activities	537,705			485,964			586,904			(74,161		)	(52,835		)
Property Data:
Office Properties:
Rentable square footage	13,249,780			11,421,112			10,395,208			8,708,466			8,650,126
Occupancy	92.8		%	90.1		%	87.5		%	80.6		%	86.2		%
Industrial Properties:
Rentable square footage	(3)			3,413,354			3,602,896			3,654,463			3,718,663
Occupancy	(3)			100.0		%	93.9		%	88.2		%	96.3		%

_______________________

(1) Represents the redemption value, less issuance costs of the Operating Partnership's issued and outstanding 1,500,000 Series A Preferred Units. All Series A Preferred Units were redeemed in 2012. See Note 9 in our consolidated financial statements included in this report for additional information.

(2) Includes the noncontrolling interests in consolidated subsidiaries.

(3) We sold all of our industrial properties during the fourth quarter of 2012.

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ITEM 7. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS    

The following discussion relates to our consolidated financial statements and should be read in conjunction with the financial statements and notes thereto appearing elsewhere in this report. The results of operations discussion is combined for the Company and the Operating Partnership because there are no material differences in the results of operations between the two reporting entities.

Forward-Looking Statements

Statements contained in this “Item 7: Management's Discussion and Analysis of Financial Condition and Results of Operations” that are not historical facts may be forward-looking statements, including statements or information concerning projected future occupancy and rental rates, lease expirations, debt maturity, potential investments, strategies such as capital recycling, development and redevelopment activity, projected construction costs, dispositions, future executive incentive compensation, pending, potential or proposed acquisitions and other forward-looking financial data, as well as the discussion in “-Factors That May Influence Future Results of Operations”, “-Liquidity and Capital Resource of the Company”, and “-Liquidity and Capital Resources of the Operating Partnership.” Forward-looking statements can be identified by the use of words such as “believes,” “expects,” “projects,” “may,” “will,” “should,” “seeks,” “approximately,” “intends,” “plans,” “pro forma,” “estimates” or “anticipates” and the negative of these words and phrases and similar expressions that do not relate to historical matters. Forward-looking statements are based on our current expectations, beliefs and assumptions, and are not guarantees of future performance. Forward-looking statements are inherently subject to uncertainties, risks, changes in circumstances, trends and factors that are difficult to predict, many of which are outside of our control. Accordingly, actual performance, results and events may vary materially from those indicated in the forward-looking statements, and you should not rely on the forward-looking statements as predictions of future performance, results or outcomes. Numerous factors could cause actual future events to differ materially from those indicated in forward-looking statements, including, among others:

• global market and general economic conditions and their effect on our liquidity and financial conditions and those of our tenants;

• adverse economic or real estate conditions in California and Washington including with respect to California's continuing budget deficits;

• risks associated with our investment in real estate assets, which are illiquid, and with trends in the real estate industry;

• defaults on or non-renewal of leases by tenants;

• any significant downturn in tenants' businesses;

• our ability to re-lease property at or above current market rates;

• costs to comply with government regulations, including environmental remediations;

• the availability of cash for distribution and debt service and exposure of risk of default under debt obligations;

• significant competition, which may decrease the occupancy and rental rates of properties;

• potential losses that may not be covered by insurance;

• the ability to successfully complete acquisitions and dispositions on announced terms;

• the ability to successfully operate acquired properties;

• the ability to successfully complete development and redevelopment properties on schedule and within budgeted amounts;

• defaults on leases for land on which some of our properties are located;

• adverse changes to, or implementations of, applicable laws, regulations or legislation;

• environmental uncertainties and risks related to natural disasters; and

• the Company's ability to maintain its status as a REIT.

The factors included in this report are not exhaustive and additional factors could adversely affect our business and financial performance. For a discussion of additional risk factors, see the factors included in this report under the caption “Risk Factors,” and in our other filings with the SEC. All forward-looking statements are based on currently available information and speak only as of the date of this report. We assume no obligation to update any forward-looking statement that becomes untrue because of subsequent events, new information or otherwise, except to the extent we are required to do so in connection with our ongoing requirements under federal securities laws.

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Company Overview

We are a self-administered REIT active in office submarkets along the West Coast. We own, develop, acquire and manage real estate assets, consisting primarily of Class A properties in the coastal regions of Los Angeles, Orange County, San Diego County, the San Francisco Bay Area and greater Seattle, which we believe have strategic advantages and strong barriers to entry. We own our interests in all of our properties through the Operating Partnership and the Finance Partnership, and conduct substantially all of our operations through the Operating Partnership. We owned a 97.6% and 97.2% general partnership interest in the Operating Partnership as of December 31, 2012 and 2011, respectively. All our properties are held in fee except for the 11 office buildings which are held subject to long-term ground leases for the land (See Note 15 to our consolidated financial statements included in this report for additional information regarding our ground lease obligations).

2012 Highlights

We made significant progress on several fronts during 2012, and are well-positioned for continued long-term growth through our strong leasing performance, well timed acquisitions, development and redevelopment efforts, ongoing capital recycling program, and successful financing activities.

Leasing - During 2012, we executed new and renewal office leases on 2.3 million square feet, our highest annual leasing performance since our formation in 1997. This leasing activity included a lease signed with salesforce.com for approximately 445,000 rentable square feet. As a result of our consistent and successful leasing efforts, occupancy in our stabilized office portfolio increased to 92.8% as of December 31, 2012, up from 90.1% as of December 31, 2011.

Operating Property Acquisitions - We remain a disciplined buyer of office properties and continue to focus on value add opportunities in West Coast markets populated by high growth tenants in a variety of industries, including technology, media, healthcare, entertainment and services. During 2012, we continued to expand our portfolio in the San Francisco Bay Area, greater Seattle, and Los Angeles through the acquisitions of eight buildings, four buildings and two buildings, in each respective region, for a total purchase price of approximately $674.0 million. As a result of the 2012 acquisitions, our stabilized portfolio has increased by approximately 1.8 million rentable square feet (see Note 3 to our consolidated financial statements included in this report for additional information).

Development Site Acquisitions - During 2012, we increased our focus on value-add and highly accretive development opportunities and expanded our future development pipeline through targeted acquisitions of development opportunities on the West Coast.

We further expanded our presence in the San Francisco Bay Area and Los Angeles through the purchase of six ground-up development opportunities, five of which are located in the San Francisco Bay Area and one that is located in the Hollywood submarket of Los Angeles. We commenced construction on four of the development opportunities located in the San Francisco Bay Area upon acquisition and expect construction to be completed at various dates beginning in late 2013 through late 2015. The remaining two development opportunities located in San Francisco and Hollywood have been added to our future development pipeline and we expect to begin construction during the first and fourth quarter of 2013 (see "—Factors that May Influence Future Operations - In-Process and Future Development Pipeline" for additional information). The total purchase price of these acquisitions was approximately $340.3 million.

Redevelopment - During 2012, we completed two of our redevelopment projects and added these projects to our stabilized portfolio. We completed both projects at a total estimated investment of approximately $97.8 million, including the $31.3 million net carrying value of the projects at the commencement of redevelopment. The total estimated investment includes lease commissions and excludes tenant improvement overages. The aggregate rentable square feet of these projects is approximately 410,000 square feet. As of December 31, 2012, these properties were 100% leased. In addition, we continued the redevelopment of one of our properties which will have a total estimated investment of approximately $180.0 million at completion. We also had one redevelopment project in lease-up with a total estimated investment of approximately $19.5 million at completion (see "—Factors that May Influence Future Operations - Redevelopment Projects" for additional information).

Capital Recycling Program - We have continued to utilized our capital recycling program to provide additional capital to fund potential acquisitions, to finance development and redevelopment expenditures, to potentially repay long-term debt and for other general corporate purposes. Our general strategy is to target the disposition of mature properties or those that have limited upside for us and redeploy some or all of the capital into acquisitions where we can add additional value to generate higher returns (see "—Factors that May Influence Future Operations" below for additional information).

In connection with our capital recycling strategy, during 2012, we completed the sale of seven office properties and our entire industrial portfolio, which was comprised of 39 industrial properties, with a combined 3,975,665 rentable square feet for a total gross sales price of approximately $500.3 million at a net gain of $259.2 million. The dispositions were structured to qualify as like-kind exchanges under Section 1031 of the Code ("Section 1031 Exchanges").

Financings - In addition to obtaining funding from our capital recycling program, we successfully completed a variety of financing and capital raising activities to fund our continued growth (see "— Liquidity and Capital Resources of the Operating Partnership" below for additional information).

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Critical Accounting Policies

The preparation of financial statements in conformity with GAAP requires us to make estimates, assumptions, and judgments that affect the reported amounts of assets, liabilities, and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses for the reporting periods.

Certain accounting policies are considered to be critical accounting policies. Critical accounting policies are those policies that require our management team to make significant estimates and/or assumptions about matters that are uncertain at the time the estimates and/or assumptions are made or where we are required to make significant judgments and assumptions with respect to the practical application of accounting principles in our business operations. Critical accounting policies are by definition those policies that are material to our financial statements and for which the impact of changes in estimates, assumptions, and judgments could have a material impact to our financial statements.

The following critical accounting policies discussion reflects what we believe are the most significant estimates, assumptions, and judgments used in the preparation of our consolidated financial statements. This discussion of our critical accounting policies is intended to supplement the description of our accounting policies in the footnotes to our consolidated financial statements and to provide additional insight into the information used by management when evaluating significant estimates, assumptions, and judgments. For further discussion of our significant accounting policies, see Note 2 to the consolidated financial statements included in this report.

Rental Revenue Recognition

Rental revenue is our principal source of revenue. The timing of when we commence rental revenue recognition depends largely on our conclusion as to whether we are or the tenant is the owner for accounting purposes of the tenant improvements at the leased property. When we conclude that we are the owner of tenant improvements for accounting purposes, we record the cost to construct the tenant improvements as an asset, and we commence rental revenue recognition when the tenant takes possession of or controls the finished space, which is typically when such tenant improvements are substantially complete.

The determination of whether we are or the tenant is the owner of the tenant improvements for accounting purposes is subject to significant judgment. In making that determination, we consider numerous factors and perform a detailed evaluation of each individual lease. No one factor is determinative in reaching a conclusion. The factors we evaluate include but are not limited to the following:

• whether the lease agreement requires landlord approval of how the tenant improvement allowance is spent prior to installation of the tenant improvements;

• whether the lease agreement requires the tenant to provide evidence to the landlord supporting the cost and what the tenant improvement allowance was spent on prior to payment by the landlord for such tenant improvements;

• whether the tenant improvements are unique to the tenant or reusable by other tenants;

• whether the tenant is permitted to alter or remove the tenant improvements without the consent of the landlord or without compensating the landlord for any lost utility or diminution in fair value; and

• whether the ownership of the tenant improvements remains with the landlord or remains with the tenant at the end of the lease term.

In addition, we also record the cost of certain tenant improvements paid for or reimbursed by tenants when we conclude that we are the owner of such tenant improvements using the factors discussed above. For these tenant-funded tenant improvements, we record the amount funded or reimbursed by tenants as deferred revenue, which is amortized and recognized as rental revenue over the term of the related lease beginning upon substantial completion of the leased premises. During the years ended December 31, 2012, 2011, and 2010, we capitalized $24.0 million, $4.3 million, and $5.4 million, respectively, of tenant-funded tenant improvements. Leases at our development and redevelopment properties generally have higher tenant-funded tenant improvements and we expect the trend to continue to increase as our development and redevelopment activities increase. For those periods, we also recognized $9.1 million, $9.3 million, and $9.7 million, respectively, of noncash rental revenue related to the amortization of deferred revenue recorded in connection with tenant-funded tenant improvements.

When we conclude that we are not the owner and the tenant is the owner of tenant improvements for accounting purposes, we record our contribution towards those improvements as a lease incentive, which is amortized as a reduction to rental revenue on a straight-line basis over the term of the related lease, and rental revenue recognition begins when the tenant takes possession of or controls the space.

Our determination as to whether we are or the tenant is the owner of tenant improvements for accounting purposes is made on a lease-by-lease basis and has a significant impact on the amount of noncash rental revenue that we record related to the

42

amortization of deferred revenue for tenant-funded tenant improvements, and can also have a significant effect on the timing of our overall revenue recognition.

Tenant Reimbursement Revenue

Reimbursements from tenants consist of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs, including capital expenditures. Calculating tenant reimbursement revenue requires an in-depth analysis of the complex terms of each underlying lease. Examples of judgments and estimates used when determining the amounts recoverable include:

• estimating the final expenses, net of accruals, that are recoverable;

• estimating the fixed and variable components of operating expenses for each building;

• conforming recoverable expense pools to those used in establishing the base year or base allowance for the applicable underlying lease; and

• concluding whether an expense or capital expenditure is recoverable pursuant to the terms of the underlying lease.

During the year, we accrue estimated tenant reimbursement revenue in the period in which the tenant reimbursable costs are incurred based on our best estimate of the amounts to be recovered. Throughout the year, we perform analyses to properly match tenant reimbursement revenue with reimbursable costs incurred to date. Additionally, during the fourth quarter of each year, we perform preliminary reconciliations and accrue additional tenant reimbursement revenue or refunds. Subsequent to year end, we perform final detailed reconciliations and analyses on a lease-by-lease basis and bill or refund each tenant for any cumulative annual adjustments in the first and second quarters of each year for the previous year’s activity. Our historical experience for the years ended December 31, 2012, 2011, and 2010 has been that our final reconciliation and billing process resulted in final amounts that approximated the total annual tenant reimbursement revenues recognized.

Allowances for Uncollectible Current Tenant Receivables and Deferred Rent Receivables

Tenant receivables and deferred rent receivables are carried net of the allowances for uncollectible current tenant receivables and deferred rent receivables. Current tenant receivables consist primarily of amounts due for contractual lease payments and reimbursements of common area maintenance expenses, property taxes, and other costs recoverable from tenants. Deferred rent receivables represent the amount by which the cumulative straight-line rental revenue recorded to date exceeds cash rents billed to date under the lease agreement. As of December 31, 2012 and 2011, current receivables were carried net of an allowance for uncollectible amount of $2.6 million for each period and deferred rent receivables were carried net of an allowance for uncollectible accounts of $2.6 million and $3.4 million, respectively.

Management’s determination of the adequacy of the allowance for uncollectible current tenant receivables and the allowance for deferred rent receivables is performed using a methodology that incorporates a specific identification analysis and an aging analysis and includes an overall evaluation of our historical loss trends and the current economic and business environment. This determination requires significant judgment and estimates about matters that are uncertain at the time the estimates are made, including the creditworthiness of specific tenants, specific industry trends and conditions, and general economic trends and conditions. Since these factors are beyond our control, actual results can differ from our estimates, and such differences could be material.

With respect to the allowance for uncollectible tenant receivables, the specific identification methodology analysis relies on factors such as the age and nature of the receivables, the payment history and financial condition of the tenant, our assessment of the tenant’s ability to meet its lease obligations, and the status of negotiations of any disputes with the tenant. With respect to the allowance for deferred rent receivables, given the longer-term nature of these receivables, the specific identification methodology analysis evaluates each of our significant tenants and any tenants on our internal watchlist and relies on factors such as each tenant’s financial condition and its ability to meet its lease obligations. We evaluate our reserve levels quarterly based on changes in the financial condition of tenants and our assessment of the tenant’s ability to meet its lease obligations, overall economic conditions, and the current business environment.

For the years ended December 31, 2012, 2011, and 2010, we recorded a total provision for bad debts for both current tenant receivables and deferred rent receivables of approximately (0.0)%, 0.2%, and (0.4)%, respectively, of rental revenue. The negative provision for the year ended December 31, 2010 reflects the reversal of approximately $1.0 million of a provision for bad debts recorded in prior years against outstanding receivables from a former tenant due to the settlement of outstanding litigation with the former tenant in 2010. Excluding the $1.0 million reversal of the provision in 2010, our historical experience has been that actual write-offs of current tenant receivables and deferred rent receivables has approximated the provision for bad debts recorded for the years ended December 31, 2012, 2011, and 2010. In the event our estimates were not accurate and we had to change our

43

allowances by 1% of recurring revenue, the potential impact to our net income available to common stockholders would be approximately $4.0 million, $3.6 million, and $3.0 million for the years ended December 31, 2012, 2011, and 2010, respectively.

Acquisitions

We record the acquired tangible and intangible assets and assumed liabilities of acquisitions of all operating properties and those development and redevelopment opportunities that meet the accounting criteria to be accounted for as business combinations at fair value at the acquisition date. We assess and consider fair value based on estimated cash flow projections that utilize available market information and discount and/or capitalization rates that we deem appropriate. Estimates of future cash flows are based on a number of factors including historical operating results, known and anticipated trends, and market and economic conditions. The acquired assets and assumed liabilities for an operating property acquisition generally include but are not limited to: land, buildings and improvements, construction in progress and identified tangible and intangible assets and liabilities associated with in-place leases, including tenant improvements, leasing costs, value of above-market and below-market operating leases and ground leases, acquired in-place lease values and tenant relationships, if any.

The fair value of land is derived from comparable sales of land within the same submarket and/or region. The fair value of buildings and improvements, tenant improvements, and leasing costs are based upon current market replacement costs and other relevant market rate information.

The fair value of the above-market or below-market component of an acquired in-place operating lease is based upon the present value (calculated using a market discount rate) of the difference between (i) the contractual rents to be paid pursuant to the lease over its remaining non-cancellable lease term and (ii) management's estimate of the rents that would be paid using fair market rental rates and rent escalations at the date of acquisition measured over the remaining non-cancellable term of the lease for above-market operating leases and the initial non-cancellable term plus the term of any below-market fixed rate renewal options, if applicable, for below-market operating leases. The amounts recorded for above-market operating leases are included in deferred leasing costs and acquisition-related intangibles, net on the balance sheet and are amortized on a straight-line basis as a reduction of rental income over the remaining term of the applicable leases. The amounts recorded for below-market operating leases are included in deferred revenue and acquisition-related liabilities, net on the balance sheet and are amortized on a straight-line basis as an increase to rental income over the remaining term of the applicable leases plus the term of any below-market fixed rate renewal options, if applicable. Our below-market operating leases generally do not include fixed rate or below-market renewal options.

The fair value of acquired in-place leases is derived based on management's assessment of lost revenue and costs incurred for the period required to lease the “assumed vacant” property to the occupancy level when purchased. This fair value is based on a variety of considerations including, but not necessarily limited to: (1) the value associated with avoiding the cost of originating the acquired in-place leases; (2) the value associated with lost revenue related to tenant reimbursable operating costs estimated to be incurred during the assumed lease-up period; and (3) the value associated with lost rental revenue from existing leases during the assumed lease-up period. Factors considered by us in performing these analyses include an estimate of the carrying costs during the expected lease-up periods, current market conditions, and costs to execute similar leases. In estimating carrying costs, we include real estate taxes, insurance and other operating expenses, and estimates of lost rental revenue during the expected lease-up periods based on current market demand at market rates. In estimating costs to execute similar leases, we consider leasing commissions, legal and other related expenses. The amount recorded for acquired in-place leases is included in deferred leasing costs and acquisition-related intangibles, net on the balance sheet and amortized as an increase to depreciation and amortization expense over the remaining term of the applicable leases. If a lease were to be terminated or if termination were determined to be likely prior to its contractual expiration (for example resulting from bankruptcy), amortization of the related unamortized in-place lease intangible would be accelerated.

The determination of the fair value of any debt assumed in connection with a property acquisition is estimated by discounting the future cash flows using interest rates available for the issuance of debt with similar terms and remaining maturities.

The determination of the fair value of the acquired tangible and intangible assets and assumed liabilities of operating property acquisitions requires us to make significant judgments and assumptions about the numerous inputs discussed above. The use of different assumptions in these fair value calculations could significantly affect the reported amounts of the allocation of our acquisition related assets and liabilities and the related amortization and depreciation expense recorded for such assets and liabilities. In addition, because the value of above and below market leases are amortized as either a reduction or increase to rental income, respectively, our judgments for these intangibles could have a significant impact on our reported rental revenues and results of operations.

Costs directly associated with all operating property acquisitions and those development and redevelopment acquisitions that meet the accounting criteria to be accounted for as business combinations are expensed as incurred. During the years ended December 31, 2012, 2011, and 2010, we expensed $4.9 million, $4.1 million and $2.2 million of acquisition costs respectively,

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based on the level of our acquisition activity during those years. Our acquisition expenses are directly related to our acquisition activity and if our acquisition activity was to increase or decrease, so would our acquisition costs. Costs directly associated with development acquisitions accounted for as asset acquisitions are capitalized as part of the cost of the acquisition. During the year ended December 31, 2012, we capitalized $0.7 million of such acquisition costs. We did not capitalize any acquisition costs during the years ended December 31, 2011 and 2010.

Evaluation of Asset Impairment

We evaluate our real estate assets for potential impairment whenever events or changes in circumstances indicate that the carrying amount of a given asset may not be recoverable. We evaluate our real estate assets for impairment on a property-by-property basis. Indicators we use to determine whether an impairment evaluation is necessary include:

• low occupancy levels or forecasted low occupancy levels at a specific property;

• current period operating or cash flow losses combined with a historical pattern or future projection of potential continued operating or cash flow losses at a specific property;

• deterioration in rental rates for a specific property as evidenced by sudden significant rental rate decreases or continuous rental rate decreases over numerous quarters, which could signal a continued decrease in future cash flow for that property;

• deterioration of a given rental submarket as evidenced by significant increases in market vacancy and/or negative absorption rates or continuous increases in market vacancy and/or negative absorption rates over numerous quarters, which could signal a decrease in future cash flow for properties within that submarket;

• significant increases in property sales yields, continuous increases in property sales yields over several quarters, or recent property sales at a loss within a given submarket, each of which could signal a decrease in the market value of properties;

• significant change in strategy or use of a specific property or any other event that could result in a decreased holding period, including classifying a property as held for sale, or significant development delay;

• evidence of material physical damage to the property; and

• default by a significant tenant when any of the other indicators above are present.

When we evaluate for potential impairment our real estate assets to be held and used, we first evaluate whether there are any indicators of impairment. If any impairment indicators are present for a specific real estate asset, we then perform an undiscounted cash flow analysis and compare the net carrying amount of the real estate asset to the real estate asset’s estimated undiscounted future cash flow over the anticipated holding period. If the estimated undiscounted future cash flow is less than the net carrying amount of the real estate asset, we perform an impairment loss calculation to determine if the fair value of the real estate asset is less than the net carrying value of the real estate asset. Our impairment loss calculation compares the net carrying amount of the real estate asset to the real estate asset’s estimated fair value, which may be based on estimated discounted future cash flow calculations or third-party valuations or appraisals. We recognize an impairment loss if the amount of the asset’s net carrying amount exceeds the asset’s estimated fair value. If we recognize an impairment loss, the estimated fair value of the asset becomes its new cost basis. For a depreciable long-lived asset, the new cost basis will be depreciated (amortized) over the remaining useful life of that asset.

Our undiscounted cash flow and fair value calculations contain uncertainties because they require management to make assumptions and to apply judgment to estimate future cash flow and property fair values, including selecting the discount or capitalization rate that reflects the risk inherent in future cash flow. Estimating projected cash flow is highly subjective as it requires assumptions related to future rental rates, tenant allowances, operating expenditures, property taxes, capital improvements, and occupancy levels. We are also required to make a number of assumptions relating to future economic and market events and prospective operating trends. Determining the appropriate capitalization rate also requires significant judgment and is typically based on many factors including the prevailing rate for the market or submarket, as well as the quality and location of the properties. Further, capitalization rates can fluctuate resulting from a variety of factors in the overall economy or within regional markets. If the actual net cash flow or actual market capitalization rates significantly differ from our estimates, the impairment evaluation for an individual asset could be materially affected.

Because of the economic and market environment, circumstances indicated that an analysis for potential impairment of certain of our properties was necessary in each of the years ended December 31, 2012, 2011, and 2010. As a result, for each property where such an indicator occurred and/or for properties within a given submarket where such an indicator occurred, we completed an impairment evaluation. After completing this process, we determined that for each of the operating properties evaluated, undiscounted cash flows over the holding period were in excess of carrying value and, therefore, we did not record any impairment losses for these periods. We determined that for each of the properties held for sale, that the sale price less estimated costs to sell exceeded the carrying value and therefore we did not record any impairment losses for these properties.

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Cost Capitalization and Depreciation

We capitalize costs associated with development and redevelopment activities, capital improvements, tenant improvements, and leasing activities. For the years ended December 31, 2012, 2011, and 2010 we capitalized $3.1 million, $1.7 million, and $1.6 million respectively, of internal costs to our qualifying redevelopment and development projects.

Amounts capitalized are depreciated or amortized over estimated useful lives determined by management. We depreciate buildings and improvements based on the estimated useful life of the asset, and we amortize tenant improvements and leasing costs over the shorter of the estimated useful life or estimated remaining life of the related lease. All capitalized costs are depreciated or amortized using the straight-line method.

Determining whether expenditures meet the criteria for capitalization and the assignment of depreciable lives requires management to exercise significant judgment. Expenditures that meet one or more of the following criteria generally qualify for capitalization:

• provide benefit in future periods;

• extend the useful life of the asset beyond our original estimates; and

• increase the quality of the asset beyond our original estimates.

Our historical experience has demonstrated that we have not had material write-offs of assets and that our depreciation and amortization estimates have been reasonable and appropriate.

Share-Based Incentive Compensation Accounting

At December 31, 2012, the Company had one share-based incentive compensation plan, the Kilroy Realty 2006 Incentive Award Plan, which is described more fully in Note 12 to the consolidated financial statements. The Executive Compensation Committee determines compensation for our Chief Executive Officer, Chief Operating Officer, Chief Investment Officer and Chief Financial Officer (“the Executive Officers”). Compensation cost for all share-based awards, including options, requires measurement at estimated fair value on the grant date and compensation cost is recognized over the service vesting period, which represents the requisite service period.   The grant date fair value for compensation plans that contain market measures are performed using complex pricing valuation models that require the input of assumptions, including judgments to estimate expected stock price volatility, expected life, and forfeiture rate.  Specifically, the grant date fair value of market measure-based share-based compensation plans are calculated using a Monte Carlo simulation pricing model and the grant date fair value of stock option grants are calculated using the Black-Scholes valuation model.

For the year ended December 31, 2012 we recorded approximately $3.9 million of compensation expense related to plans that contained market measures and were therefore subject to such valuation models.  If the valuation of the grant date fair value for such plans changed by 10%, the potential impact to our net income available to common stockholders would be approximately $0.4 million for the year ended December 31, 2012.  There was no compensation expense related to market measure-based plans recorded for the years ended December 31, 2011 and 2010 since our market measure-based share-based compensation plans and options were granted in 2012.

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Factors That May Influence Future Results of Operations

Acquisitions. During the year ended December 31, 2012, we acquired 14 office buildings in seven transactions with an aggregate purchase price of approximately $674.0 million and six development and redevelopment opportunity projects in six transactions with an aggregate purchase price of approximately $340.3 million. During the year ended December 31, 2011, we acquired ten office buildings and one redevelopment opportunity project in eight transactions with an aggregate purchase price of approximately $637.8 million (see Note 3 to our consolidated financial statements included in this report for additional information). As of the date of this report, we have completed the acquisition of one additional office building with a purchase price of approximately $170.0 million. We generally finance our acquisitions through proceeds from the issuance of debt and equity securities, borrowings under our revolving revolving credit facility, proceeds from our capital recycling program and the assumption of existing debt.

As a key component of our growth strategy, we continually evaluate acquisition opportunities (including office properties, undeveloped land, and development and redevelopment opportunities) as they arise. As a result, at any point in time we may have one or more potential acquisitions under consideration that are in varying stages of evaluation, negotiation or due diligence review, which may include potential acquisitions under contract. As of the date of the filing of this report, we were also in negotiations to acquire an additional future development opportunity. We cannot provide assurance that we will acquire this property. In the future, we may enter into agreements to acquire other properties, either as wholly-owned properties or through joint ventures, and those agreements typically will be subject to the satisfaction of closing conditions. We cannot provide assurance that we will enter into any agreements to acquire properties, or that the potential acquisitions contemplated by any agreements we may enter into in the future will be completed. Costs associated with acquisitions accounted for as business combinations are expensed as incurred, and we may be unable to complete an acquisition after making a nonrefundable deposit or incurring acquisition−related costs. In addition, acquisitions are subject to various other risks and uncertainties.

Capital Recycling Program. During the year ended December 31, 2012, we disposed of seven office properties and our entire industrial portfolio, which was comprised of 39 Industrial Properties, with a combined 3,975,665 rentable square feet, for a total gross sales price of approximately $500.3 million at a net gain of $259.2 million (see Note 17 to our consolidated financial statements included in this report for more information). In connection with this transaction, the dispositions were structured to qualify as Section 1031 Exchanges. Approximately $228.8 million of the sales proceeds, which were included in restricted cash on the consolidated balance sheets at December 31, 2012, were reinvested into qualifying replacement properties as of the filing date of this report.

As part of our current and ongoing strategy, we continuously evaluate opportunities for the potential disposition of properties and undeveloped land in our portfolio with the intent of recycling the proceeds generated from the disposition of non-strategic properties into capital to fund new operating and development acquisitions, development and redevelopment expenditures, to repay long-term debt and for other general corporate purposes. As part of our capital recycling strategy, we intend, when practical, to enter into Section 1031 Exchanges to defer some or all of the taxable gains, if any, on the sales for federal and state income tax purposes.

The timing of any potential future deposition transactions will depend on market conditions and other factors, including but not limited to our capital needs and our ability to defer some or all of the taxable gains on the sales. We cannot assure you that we will dispose of any additional properties, or that future acquisitions and/or dispositions, if any, will qualify as Section 1031 Exchanges.

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Leasing Activity and Changes in Rental Rates. The amount of net rental income generated by our properties depends principally on our ability to maintain the occupancy rates of currently leased space and to lease currently available space, newly developed or redeveloped properties, newly acquired properties with vacant space, and space available from unscheduled lease terminations. The amount of rental income we generate also depends on our ability to maintain or increase rental rates in our submarkets. Negative trends in one or more of these factors could adversely affect our rental income in future periods. The following tables set forth certain information regarding leasing activity for our stabilized portfolio during the year ended December 31, 2012.

Information on Leases Commenced and Executed

For Leases Commenced

	1st & 2nd Generation(1)				2nd Generation(1)
	Number of Leases(2)		Rentable Square Feet(2)		TI/LC per Sq. Ft.(3)		Changes in Rents(4)(6)		Changes in Cash Rents(5)		Retention Rates(7)		Weighted Average Lease Term (in months)
	New	Renewal	New	Renewal
Year Ended December 31, 2012	86	63	895,345	629,664	$	30.02	11.1	%	3.5	%	51.9	%	68

For Leases Executed⁽⁸⁾ 

	1st & 2nd Generation(1)				2nd Generation(1)
	Number of Leases(2)		Rentable Square Feet(2)		TI/LC per Sq. Ft.(3)		Changes in Rents(4)(6)		Changes in Cash Rents(5)		Weighted Average Lease Term (in months)
	New	Renewal	New	Renewal
Year Ended December 31, 2012	83	68	998,659	779,959	$	36.64	21.3	%	9.7	%	73

_______________

(1) First generation leasing includes space where we have made capital expenditures that result in additional revenue generated when the space is re-leased. Second generation leasing includes space where we have made capital expenditures to maintain the current market revenue stream.

(2) Represents leasing activity for leases that commenced or signed during the period, including first and second generation space, net of month-to-month leases. Excludes leasing on new construction.

(3) Amounts exclude tenant-funded tenant improvements.

(4) Calculated as the change between GAAP rents for new/renewed leases and the expiring GAAP rents for the same space. Excludes leases for which the space was vacant longer than one year or vacant when the property was acquired.

(5) Calculated as the change between stated rents for new/renewed leases and the expiring stated rents for the same space. Excludes leases for which the space was vacant longer than one year or vacant when the property was acquired.

(6) Excludes commenced and executed leases of approximately 469,000 and 394,000 rentable square feet, respectively, for the year ended December 31, 2012, for which the space was vacant longer than one year or being leased for the first time. Space vacant for more than one year is excluded from our change in rents calculations to provide a meaningful market comparison.

(7) Calculated as the percentage of space either renewed or expanded into by existing tenants or subtenants at lease expiration.

(8) During the year, 14 leases totaling approximately 204,000 rentable square feet were signed but had not commenced as of December 31, 2012.

As of December 31, 2012, we believe that the weighted average cash rental rates for our stabilized portfolio, including recently acquired operating properties, are approximately at the current average market rental rates, although individual properties within any particular submarket presently may be leased either above, below, or at the current market rates within that submarket, and the average rental rates for individual submarkets may be above, below, or at the average cash rental rate of our portfolio.

In general, market rental rates increased in the majority of our submarkets during 2012. Our rental rates and occupancy are impacted by general economic conditions, including the pace of regional economic growth and access to capital. Therefore, we cannot give any assurance that leases will be renewed or that available space will be re-leased at rental rates equal to or above the current market rates. Additionally, decreased demand and other negative trends or unforeseeable events that impair our ability to timely renew or re-lease space could have further negative effects on our future financial condition, results of operations, and cash flows.

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Scheduled Lease Expirations.   The following table sets forth certain information regarding our lease expirations for our stabilized portfolio for future periods as of December 31, 2012:

Lease Expirations⁽¹⁾

Year of Lease Expiration	Number of Expiring Leases	Total Square Feet	% of Total Leased Sq. Ft.		Annualized Base Rent (1)		% of Total Annualized Base Rent (1)		Annualized Base Rent per Sq. Ft. (1)
2013	94	855,902	7.1	%	$	22,524	6.0	%	$	26.32
2014	121	1,250,019	10.4	%	36,098		9.6	%	28.88
2015	151	2,124,976	17.7	%	65,432		17.4	%	30.79
2016	74	808,217	6.7	%	21,119		5.6	%	26.13
2017	99	1,951,623	16.2	%	58,162		15.4	%	29.80
2018	52	1,281,765	10.6	%	49,569		13.1	%	38.67
Total(2)	591	8,272,502	68.7	%	$	252,904	67.1	%	$	30.57

________________________ 

(1) Annualized base rent includes the impact of straight-lining rent escalations and the amortization of free rent periods and excludes the impact of the following:  amortization of deferred revenue related tenant-funded tenant improvements, amortization of above/below market rents, amortization for lease incentives due under existing leases, and expense reimbursement revenue.  Additionally, the underlying leases contain various expense structures including full service gross, modified gross and triple net. Amounts represent percentage of total portfolio annualized contractual base rental revenue. For additional information on tenant improvement and leasing commission costs incurred by the Company for the current reporting period, please see further discussion under the caption "Information on Leases Commenced and Executed."

(2) The information presented for all lease expiration activity reflects leasing activity through December 31, 2012 for our stabilized portfolio. For leases that have been renewed early or space that has been re-leased to a new tenant, the expiration date and annualized base rent information presented takes into consideration the renewed or re-leased lease terms. Excludes space leased under month-to-month leases, vacant space, and lease renewal options not executed as of December 31, 2012.

In addition to the 1.0 million rentable square feet, or 7.2%, of currently available space in our stabilized portfolio, leases representing approximately 7.1% and 10.4% of the occupied square footage of our stabilized portfolio are scheduled to expire during the remainder of 2013 and in 2014, respectively. The leases scheduled to expire in 2013 and 2014 represent approximately 2.1 million rentable square feet of office space, or 15.6% of our total annualized base rental revenue. We believe that the weighted average cash rental rates are approximately 5% under the current average quoted market rates for leases scheduled to expire during 2013 and 2014, although individual properties within any particular submarket presently may be leased either above, below, or at the current quoted market rates within that submarket, and the average rental rates for individual submarkets may be above, below, or at the average cash rental rate of our overall portfolio. Our ability to re-lease available space depends upon both general market conditions and the market conditions in the specific regions in which individual properties are located.

Redevelopment Projects

We believe that a portion of our potential long-term future growth will continue to come from redevelopment opportunities both through acquired properties and within our existing portfolio. Redevelopment opportunities are those projects in which we spend significant development and construction costs on existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. During the fourth quarter ended December 31, 2012, we completed construction of the following two redevelopment projects.

• 2260 E. Imperial Highway, El Segundo, submarket of Los Angeles, on which we commenced redevelopment in the third quarter of 2010. The redevelopment project, encompassing approximately 299,000 rentable square feet, has a total estimated investment of approximately $60.4 million, including the $9.1 million net carrying value of the project at the commencement of redevelopment. The building was 100% pre-leased to DIRECTV, our largest tenant. DIRECTV began paying cash rent on the entire building in December 2012.

• 5010 Wateridge Vista Drive, Sorrento Mesa, submarket of San Diego, on which we commenced redevelopment in the third quarter of 2011. The redevelopment project encompasses approximately 111,000 rentable square feet. As part of the redevelopment, we incorporated one of our undeveloped land parcels. The redevelopment project has a total estimated investment of approximately $37.4 million, including the $22.2 million net carrying value of the project at the commencement of redevelopment. The building was 100% pre-leased to TD Ameritrade and rent commenced in October 2012.

As of December 31, 2012, we had one redevelopment project in lease-up and another redevelopment project under construction.

• 3880 Airport Way, Long Beach, submarket of Los Angeles, on which we commenced redevelopment in the third quarter of 2011. This lease-up property, encompassing approximately 98,000 rentable square feet, was 50% leased prior to the commencement of redevelopment which was done in two phases. Redevelopment on the first half, which was leased, was completed during the second quarter of 2012, and redevelopment on the second half was completed in the fourth

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quarter of 2012. The lease-up project will have a total estimated investment of approximately $19.5 million upon completion, including the $6.3 million net carrying value of the project at the commencement of redevelopment.

• 360 Third Street, South of Market Area, submarket of San Francisco, on which we commenced redevelopment in the fourth quarter of 2011. The redevelopment project, which encompasses approximately 410,000 rentable square feet, will have a total estimated investment of approximately $180.0 million at completion, including the $88.5 million net carrying value of the project at the commencement of redevelopment plus $27.5 million that we expect to pay in the second quarter of 2013 to acquire the land that is currently subject to a ground lease. Construction is currently expected to be completed in the first quarter of 2014. As of December 31, 2012, the building was approximately 75% leased and 26% occupied. 

In-Process and Future Development Pipeline

We believe that a portion of our long-term future growth will also come from the completion of our under construction and in-process projects as well as executing on our future development pipeline, subject to market conditions. During 2012, we increased our focus on value-add and highly accretive development opportunities and expanded our future development pipeline through targeted acquisitions of development opportunities on the West Coast.

We have a proactive planning process by which we continually evaluate the size, timing, costs and scope of our development program and, as necessary, scale activity to reflect the economic conditions and the real estate fundamentals that exist in our strategic submarkets. We expect to proceed in our development program with discipline and will be pursuing opportunities with attractive economic returns, in locations with transportation and retail amenities and in markets with strong fundamentals and visible demand. We plan to develop in phases as appropriate and we strongly favor starting projects that are pre-leased.

As of the date of this report, our near-term development pipeline consisted of the following four projects under construction and two projects expected to commence in 2013.

• 690 E. Middlefield Road, Mountain View, California, which we acquired in May 2012. We acquired the project for $84.0 million, comprised of a cash purchase price of $74.5 million plus $9.5 million of assumed leasing commissions and other net accrued liabilities. The development project, which is 100% pre-leased to Synopsis, Inc., has a total estimated investment of approximately $195.7 million and is expected to encompass approximately 341,000 rentable square feet upon completion. Construction is currently in process and is expected to be completed in the first quarter of 2015.

• 331 Fairchild Drive, Mountain View, California, which we acquired in December 2012 and is 100% pre-leased. We acquired the project for $18.9 million plus $2.9 million of development costs to be reimbursed to the seller and are planning to develop an approximately 88,000 square foot building. The development project has a total estimated investment of approximately $45.2 million. Construction is currently in process and is expected to be completed in the fourth quarter of 2013.

• 350 Mission Street, South of Market Financial District, San Francisco, California, which we acquired in October 2012 for approximately $52.0 million.  Shortly after acquisition, we pre-leased the entire project to salesforce.com and are currently planning to develop an approximately 400,000 square foot, 27 story office tower that adapts our open-plan workspace concepts to a high-rise office environment. The property is expected to be LEED platinum certified and the first ground up development property in the city to receive this designation. The development project has a total estimated investment of approximately $254.7 million. We are currently pursuing entitlements to increase this project to a 30-story office tower, which would increase the estimated rentable square feet and total estimated investment. Construction is currently in process and is expected to be completed in the first quarter of 2015.

• 555-599 N. Mathilda Avenue, Sunnyvale, California, which we acquired in December 2012 for approximately $137.6 million. The project, which is comprised of one operating property and a future development site, is 100% pre-leased. Our plan at this project is to continue operating the existing building and develop an approximately 587,000 square foot office complex for LinkedIn, the tenant in the current existing building. The development project has a total estimated investment of approximately $313.2 million. Construction is currently in progress and is expected to be completed in the third quarter of 2014.

• 333 Brannan Street, South of Market Area, San Francisco, California, which we acquired in July 2012 for approximately $18.5 million. We currently expect to develop an approximately 170,000 rentable square foot office building on this site that will include all the features, amenities and systems that tech and media tenants need to accommodate their increased densities for a total estimated investment of approximately $85.0 million. We currently expect to begin construction in the fourth quarter of 2013.

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• Columbia Square, in Hollywood, California, which we acquired in September 2012 for approximately $65.0 million.  This project is a historic media campus located in the heart of Hollywood, two blocks from the corner of Sunset Boulevard and Vine Street. The site is fully entitled for the development of an 875,000 rentable square foot office, retail and multi-family mixed use project under a 15-year development agreement that includes three existing buildings and which we plan to develop in phases. We intend to redevelop the three existing buildings, which encompass approximately 100,000 rentable square feet, and to develop more than 500,000 square feet of office, retail and residential space. We currently expect to invest an additional $246.0 million for a total estimated investment of approximately $315.0 million. Our plan is to create a mixed-use campus that preserves the historical character while establishing a new center for many entertainment and media companies. We expect to commence redevelopment of the three historic buildings, and initial construction of the office component in early to mid-2013 with completion of phase one targeted for 2015.

As of the date of this report, we were also in negotiations to acquire an additional future development opportunity. We cannot provide assurance that we will acquire this project. In the future, we may also enter into agreements to acquire other development or redevelopment opportunities, either as wholly-owned properties or through joint ventures and those agreements typically will be subject to the satisfaction of closing conditions. In addition, as of December 31, 2012, we had additional undeveloped land holdings, located primarily in various submarkets in San Diego County with an aggregate cost basis of approximately $284.1 million.

This increase in our development and redevelopment activities, primarily as a result of acquisitions completed in the fourth quarter of 2012, will cause an increase in the average development asset balances qualifying for interest and other carry cost capitalization in future periods.

Incentive Compensation.  Our Executive Compensation Committee determines compensation, including equity and cash incentive programs, for our executive officers in accordance with the terms and conditions of applicable agreements and incentive award programs. Incentive compensation for our executive officers for 2012 was structured to allow the Executive Compensation Committee to evaluate a variety of key factors and metrics at the end of the year and make a determination of incentive compensation for executive officers based on the Company's and management's overall performance. As a result, accrued incentive compensation and compensation expense for future incentive compensation awards could be affected by our operating and development performance, financial results, total shareholder return, market conditions and other performance conditions. Consequently, we cannot predict the amounts that will be recorded in future periods related to such incentive compensation.

Share-Based Compensation. As of December 31, 2012, there was $25.9 million of total unrecognized compensation cost related to outstanding nonvested shares of restricted common stock, RSUs and stock options issued under share-based compensation arrangements. Those costs are expected to be recognized over a weighted-average period of 2.6 years. Additional unrecognized compensation cost of $7.7 million related to 157,744 nonvested RSUs issued under share-based compensation arrangements subsequent to December 31, 2012 is expected to be recognized over a period of 5.0 years. Share-based compensation expense for potential future awards could be affected by our operating and development performance, financial results, total shareholder return and market conditions. Consequently, we cannot predict the amounts that will be recorded in future periods for such share-based awards. See Note 12 to our consolidated financial statements for additional information regarding our share-based incentive compensation plan.

Stabilized Portfolio Information

As of December 31, 2012, our stabilized portfolio was comprised of 114 office properties encompassing an aggregate of approximately 13.2 million rentable square feet. Our stabilized portfolio includes all of our properties with the exception of undeveloped land, development and redevelopment properties currently under construction or committed for construction, “lease-up” properties and properties held-for-sale. We define lease-up properties as properties recently developed or redeveloped that have not yet reached 95% occupancy and are within one year following cessation of major construction activities. We define redevelopment properties as those projects for which we expect to spend significant development and construction costs on existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. Our stabilized portfolio also excludes our future development pipeline, which is comprised of nine potential development sites, representing 118.5 gross acres of undeveloped land.

At December 31, 2012, our stabilized portfolio excluded one "lease-up" property, one redevelopment and four development properties currently under construction and one property moved from the stabilized portfolio to the development pipeline during the fourth quarter of 2012.

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The following table reconciles the changes in the rentable square feet in our stabilized portfolio of operating properties from December 31, 2011 to December 31, 2012:

	Office Properties				Industrial Properties				Total
	Number of Buildings		Rentable Square Feet		Number of Buildings		Rentable Square Feet		Number of Buildings		Rentable Square Feet
Total as of December 31, 2011	104		11,421,112		39		3,413,354		143		14,834,466
Acquisitions(1)	14		1,759,603						14		1,759,603
Completed redevelopment properties placed in-service	2		410,046						2		410,046
Property moved to the development pipeline	(1	)	(45,195	)					(1	)	(45,195	)
Dispositions	(5	)	(308,635	)	(39	)	(3,413,354	)	(44	)	(3,721,989	)
Remeasurement			12,849								12,849
Total as of December 31, 2012	114		13,249,780		—		—		114		13,249,780

_______________________

(1) Excludes redevelopment and development property acquisitions.

Occupancy Information

The following table sets forth certain information regarding our stabilized portfolio:

Stabilized Portfolio Occupancy

Region	Number of Buildings	Rentable Square Feet	Occupancy at(1)
			12/31/2012		12/31/2011		12/31/2010
Los Angeles and Ventura Counties	27	3,487,741	94.0	%	83.5	%	89.3	%
San Diego County	59	5,250,413	90.7		92.5		86.4
Orange County	4	497,393	92.0		93.4		93.1
San Francisco Bay Area	14	2,286,994	95.5		93.3		84.3
Greater Seattle	10	1,727,239	93.3		89.9		100.0
Total Stabilized Portfolio	114	13,249,780	92.8		90.1		87.5

	Average Occupancy
	2012	2011
Stabilized Portfolio(1)	91.3%	91.3%
Same Store Portfolio(2)	91.5%	91.9%

 ______________

(1) Occupancy percentages reported are based on our stabilized office portfolio as of the end of the period presented.

(2) Occupancy percentages reported are based on office properties owned and stabilized as of January 1, 2011 and still owned and stabilized as of December 31, 2012. See discussion under "Results of Operations" for additional information.

Current Regional Information

We have generally seen rental rates stabilize and start to improve in many of our submarkets. We have also seen vacancy rates in many of our submarkets are starting to decrease.

Los Angeles and Ventura Counties. Our Los Angeles and Ventura Counties stabilized portfolio of 3.5 million rentable square feet was 94.0% occupied with approximately 210,100 available rentable square feet as of December 31, 2012 compared to 83.5% occupied with approximately 491,300 available rentable square feet as of December 31, 2011. During 2012, we completed the sale of four buildings encompassing approximately 265,400 rentable square feet located in Ventura County that were included in this portfolio as of December 31, 2011. Excluding these four buildings, the Los Angeles and Ventura Counties stabilized portfolio would have been 90.2% as of December 31, 2011. The increase in occupancy, excluding the impact of the disposed properties, is primarily attributable to one redevelopment property encompassing approximately 299,000 rentable square feet that was added to the stabilized portfolio upon completion and was 100% occupied as of December 31, 2012. In addition, occupancy increased

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due to the acquisition of two office buildings during the year ended December 31, 2012 encompassing approximately 473,000 rentable square feet that were 88.9% occupied as of December 31, 2012.

As of December 31, 2012, leases representing an aggregate of approximately 333,700 and 353,500 rentable square feet are scheduled to expire during 2013 and in 2014, respectively, in this region. The aggregate rentable square feet under the leases scheduled to expire in this region during 2013 and in 2014 represents approximately 5.7% of our occupied rentable square feet and 5.4% of our annualized base rental revenues in our total stabilized portfolio.

San Diego County. Our San Diego County stabilized portfolio of 5.3 million rentable square feet was 90.7% occupied with approximately 486,800 available rentable square feet as of December 31, 2012 compared to 92.5% occupied with approximately 391,100 available rentable square feet as of December 31, 2011. The decrease in occupancy is primarily attributable to four leases that expired during the year ended December 31, 2012 offset by one office building placed in service in the fourth quarter of 2012 encompassing approximately 111,000 rentable square feet that was 100% occupied as of December 31, 2012. As of December 31, 2012, we have leased approximately 131,000 rentable square feet in this region that was vacant at December 31, 2012 to five tenants. The new leases are scheduled to commence during various quarters in 2013.

As of December 31, 2012, leases representing an aggregate of approximately 301,400 and 480,800 rentable square feet are scheduled to expire during 2013 and 2014, respectively, in this region. The aggregate rentable square feet under leases scheduled to expire in this region in 2013 and 2014 represents approximately 6.5% of our occupied rentable square feet and 4.5% of our annualized base rental revenues in our total stabilized portfolio occupied as of December 31, 2012.

Orange County. Our Orange County stabilized portfolio of approximately 497,400 rentable square feet was 92.0% occupied with approximately 39,700 available rentable square feet as of December 31, 2012, compared to 93.4% occupied with approximately 35,500 available rentable square feet as of December 31, 2011.

As of December 31, 2012, leases representing an aggregate of approximately 55,000 and 60,400 rentable square feet are scheduled to expire during 2013 and 2014, respectively, in this region. The aggregate rentable square feet under leases scheduled to expire in 2013 and 2014 represents approximately 1.0% of our occupied rentable square feet and 0.8% of our annualized base rental revenues in our total stabilized portfolio as of December 31, 2012.

San Francisco Bay Area. As of December 31, 2012, our San Francisco Bay Area stabilized portfolio of 2.3 million rentable square feet was 95.5% occupied with approximately 102,800 available rentable square feet, compared to 1.8 million rentable square feet that was 93.3% occupied with approximately 121,900 available rentable square feet as of December 31, 2011. The increase in occupancy is primarily attributable to 2 new leases that commenced during the year ended December 31, 2012, offset by the acquisition of eight office buildings during the year ended December 31, 2012 encompassing approximately 449,900 rentable square feet that were 87.3% occupied as of December 31, 2012.  We have leased 9,500 rentable square feet in this region that was vacant at December 31, 2012 to three tenants, with new leases scheduled to commence in the first quarter of 2013.

As of December 31, 2012, leases representing an aggregate of approximately 128,400 and 247,200 rentable square feet are scheduled to expire during 2013 and 2014, respectively, in this region. The aggregate rentable square feet under leases scheduled to expire in this region during 2013 and 2014 represents approximately 3.2% of our occupied rentable square feet and 3.6% of our annualized base rental revenues in our total stabilized portfolio as of December 31, 2012.

Greater Seattle.    As of December 31, 2012, our Greater Seattle stabilized portfolio of 1.7 million rentable square feet was 93.3% occupied with approximately 116,100 available rentable square feet, compared to 89.9% occupied with approximately 90,300 available rentable square feet as of December 31, 2011. The increase in occupancy is primarily attributable to the acquisition of four office buildings during the year ended December 31, 2012 encompassing approximately 836,700 rentable square feet that were 94.6% occupied as of December 31, 2012. We have leased 37,800 rentable square feet in this region that was vacant at December 31, 2012 to two tenants, with new leases scheduled to commence in the first half of 2013.

As of December 31, 2012, leases representing an aggregate of approximately 37,400 and 108,100 rentable square feet are scheduled to expire during 2013 and 2014, respectively. The aggregate rentable square feet under leases scheduled to expire in this region during 2013 and 2014 represents approximately 1.2% of our occupied rentable square feet and 1.2% of our annualized base rental revenues in our total stabilized portfolio as of December 31, 2012.

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Results of Operations

Year Ended December 31, 2012 Compared to Year Ended December 31, 2011

Net Operating Income

Management internally evaluates the operating performance and financial results of our stabilized portfolio based on Net Operating Income. We define “Net Operating Income” as operating revenues (rental income, tenant reimbursements, and other property income) less operating expenses (property expenses, real estate taxes, provision for bad debts, and ground leases).

Net Operating Income is considered by management to be an important and appropriate supplemental performance measure to net income (loss) because we believe it helps both investors and management to understand the core operations of our properties excluding corporate and financing-related costs and non-cash depreciation and amortization. Net Operating Income is an unlevered operating performance metric of our properties and allows for a useful comparison of the operating performance of individual assets or groups of assets. This measure thereby provides an operating perspective not immediately apparent from GAAP income (loss) from operations or net income (loss). In addition, Net Operating Income is considered by many in the real estate industry to be a useful starting point for determining the value of a real estate asset or group of assets. Other real estate companies may use different methodologies for calculating Net Operating Income, and accordingly, our presentation of Net Operating Income may not be comparable to other real estate companies. Because of the exclusion of the items shown in the reconciliation below, Net Operating Income should only be used as a supplemental measure of our financial performance and not as an alternative to GAAP income (loss) from operations or net income (loss).

Management further evaluates Net Operating Income by evaluating the performance from the following property groups:

• Same Store Properties - which includes the results of all of the office properties that were owned and included in our stabilized portfolio as of January 1, 2011 and still owned and included in the stabilized portfolio as of December 31, 2012;

• Acquisition Properties - which includes the results, from the dates of acquisition through the periods presented, for the ten office buildings we acquired during 2011 and the fourteen office buildings we acquired during 2012;

• Stabilized Redevelopment Properties - which includes the results generated by two office buildings that were moved into the stabilized portfolio upon completion of redevelopment in the fourth quarter of 2012. Both office buildings were moved into redevelopment during 2011, thus the prior year results reflect operating results for the properties prior to redevelopment.

• Other Properties - which includes the results of properties not included in our stabilized portfolio. These properties consist of one office building in "lease-up", one redevelopment project under construction and one office building that was moved from the stabilized portfolio during 2012 to development since the property is being repositioned.

The following table sets forth certain information regarding the property groups within our stabilized portfolio as of December 31, 2012:

Group	# of Buildings	Rentable Square Feet
Same Store Properties	88	9,506,919
Acquisition Properties	24	3,332,815
Stabilized Redevelopment Properties	2	410,046
Total Stabilized Portfolio	114	13,249,780

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The following table reconciles our Net Operating Income, as defined, to our net income for the years ended December 31, 2012 and 2011.

	Year Ended December 31,						Dollar Change			Percentage Change
	2012			2011
	($ in thousands)
Reconciliation to Net Income:
Net Operating Income, as defined	$	287,755		$	238,615		$	49,140		20.6	%
Unallocated (expense) income:
General and administrative expenses	(36,188		)	(28,148		)	(8,040		)	28.6
Acquisition-related expenses	(4,937		)	(4,053		)	(884		)	21.8
Depreciation and amortization	(162,917		)	(124,928		)	(37,989		)	30.4
Interest income and other net investment gains	848			571			277			48.5
Interest expense	(79,114		)	(85,785		)	6,671			(7.8	)
Income (loss) from continuing operations	5,447			(3,728		)	9,175			(246.1	)%
Income from discontinued operations	12,409			19,630			(7,221		)	(36.8	)%
Net gain on dispositions of discontinued operations	259,245			51,587			207,658			402.5	%
Net income	$	277,101		$	67,489		$	209,612		310.6	%

The following tables summarize the Net Operating Income (Loss), as defined, for our total portfolio for the years ended December 31, 2012 and 2011.

	2012										2011
	Same Store		Acquisition Properties		Stabilized Redevelopment		Other		Total		Same Store		Acquisition Properties		Stabilized Redevelopment			Other			Total
	(in thousands)										(in thousands)
Operating revenues:
Rental income	$	285,043	$	78,555	$	957	$	4,961	$	369,516	$	281,180	$	24,403	$	—		$	1,535		$	307,118
Tenant reimbursements	19,193		12,626		173		317		32,309		19,262		4,462		59			194			23,977
Other property income	2,713		365		—		9		3,087		6,031		471		32			—			6,534
Total	306,949		91,546		1,130		5,287		404,912		306,473		29,336		91			1,729			337,629
Property and related expenses:
Property expenses	60,501		17,051		542		1,263		79,357		59,454		5,977		534			856			66,821
Real estate taxes	25,303		7,567		89		1,520		34,479		25,747		2,255		143			1,488			29,633
Provision for bad debts	153		—		—		—		153		781		—		—			—			781
Ground leases	897		1,512		4		755		3,168		1,137		446		13			183			1,779
Total	86,854		26,130		635		3,538		117,157		87,119		8,678		690			2,527			99,014
Net Operating Income (Loss), as defined	$	220,095	$	65,416	$	495	$	1,749	$	287,755	$	219,354	$	20,658	$	(599	)	$	(798	)	$	238,615

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	Year Ended December 31, 2012 as compared to the Year Ended December 31, 2011
	Same Store					Acquisition Properties					Stabilized Redevelopment					Other				Total Portfolio
	Dollar Change			% Change		Dollar Change			% Change		Dollar Change			% Change		Dollar Change		% Change		Dollar Change			% Change
											($ in thousands)
Operating revenues:
Rental income	$	3,863		1.4	%	$	54,152		221.9	%	$	957		100.0	%	$	3,426	223.2	%	$	62,398		20.3	%
Tenant reimbursements	(69		)	(0.4	)	8,164			183.0		114			193.2	%	123		63.4	%	8,332			34.7
Other property income	(3,318		)	(55.0	)	(106		)	(22.5	)	(32		)	(100.0	)%	9		100.0	%	(3,447		)	(52.8	)
Total	476			0.2		62,210			212.1		1,039			1,141.8	%	3,558		205.8	%	67,283			19.9
Property and related expenses:
Property expenses	1,047			1.8		11,074			185.3		8			1.5	%	407		47.5	%	12,536			18.8
Real estate taxes	(444		)	(1.7	)	5,312			235.6		(54		)	(37.8	)%	32		2.2	%	4,846			16.4
Provision for bad debts	(628		)	(80.4	)	—			—		—			—	%	—		—	%	(628		)	(80.4	)
Ground leases	(240		)	(21.1	)	1,066			239.0		(9		)	(69.2	)%	572		312.6	%	1,389			78.1
Total	(265		)	(0.3	)	17,452			201.1		(55		)	(8.0	)%	1,011		40.0	%	18,143			18.3
Net Operating Income, as defined	$	741		0.3	%	$	44,758		216.7	%	$	1,094		182.6	%	$	2,547	319.2	%	$	49,140		20.6	%

Net Operating Income increased $49.1 million, or 20.6%, for the year ended December 31, 2012 as compared to the year ended December 31, 2011 primarily resulting from:

• An increase of $44.8 million attributable to the Acquisition Properties;

• An increase of $0.7 million attributable to the Same Store Properties primarily resulting from:

▪ An increase in rental income of $3.9 million primarily resulting from an increase in tenant renewals at higher rental rates;

• An offsetting decrease in other property income of $3.3 million primarily due to cash distributions received under a bankruptcy claim related to a former tenant that defaulted on their lease in 2009. During the year ended December 31, 2011, we received a $4.3 million initial cash distribution and during the year ended December 31, 2012, we received a final $0.9 million cash distribution. Other property income for both periods consist primarily of lease termination fees and other miscellaneous income; and

• A decrease in property and related expenses of $0.3 million primarily resulting from:

• An increase of $1.0 million in property expenses primarily as a result of an increase in certain recurring operating costs such as property management expenses and janitorial and other service-related costs;

• An offsetting decrease in real estate taxes of $0.4 million as a result of property tax refunds;

• An offsetting decrease in provision for bad debts of $0.6 million due to a higher provision recorded in the prior year period for two watchlist tenants and

• An offsetting decrease in ground lease expense of $0.2 million as a result of the expiration of a ground lease;

• An increase of $1.1 million attributable to the two completed redevelopment properties added to the stabilized portfolio during the fourth quarter of 2012:

• The net operating loss included in the results for the year ended December 31, 2011 related to one of the properties that was moved to the redevelopment portfolio during the third quarter of 2011.

• An increase in net operating income of $2.5 million attributable to the Other Properties primarily resulting from income generated in 2012 from:

• one redevelopment property in lease-up that was 50% occupied at December 31, 2012. The tenant took occupancy of this space in June 2012; and

• one in-process redevelopment property that was 17% occupied at December 31, 2012. The tenant took occupancy of this space in July 2012.

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Other Income and Expenses

General and Administrative Expenses

General and administrative expenses increased $8.0 million, or 28.6%, for the year ended December 31, 2012 compared to the year ended December 31, 2011 primarily as a result of an increase in compensation expense related to the February 2012 stock option grants made to our senior management team, higher payroll costs associated with the renegotiation of our Chief Executive Officer's employment agreement and an increase in payroll and administrative costs associated with the growth of the Company.

Depreciation and Amortization

Depreciation and amortization increased by $38.0 million, or 30.4%, for the year ended December 31, 2012 compared to the year ended December 31, 2011, primarily related to the Acquisition Properties.

Interest Expense

The following table sets forth our gross interest expense from continuing operations, including debt discounts/premiums and loan cost amortization, net of capitalized interest, including capitalized debt discounts/premiums and loan cost amortization for the years ended December 31, 2012 and 2011:

	2012			2011			Dollar Change			Percentage Change
	($ in thousands)
Gross interest expense	$	98,906		$	94,915		$	3,991		4.2	%
Capitalized interest	(19,792		)	(9,130		)	(10,662		)	116.8	%
Interest expense	$	79,114		$	85,785		$	(6,671	)	(7.8	)%

Gross interest expense, before the effect of capitalized interest, increased $4.0 million, or 4.2% for the year ended December 31, 2012 compared to the year ended December 31, 2011 resulting from an increase in our average outstanding debt balances primarily as a result of acquisition activity, partially offset by a decrease in our weighted average GAAP effective interest rate from approximately 5.2% during the year ended December 31, 2011 to approximately 4.7% during the year ended December 31, 2012.

Capitalized interest increased $10.7 million, or 116.8%, for the year ended December 31, 2012 compared to the year ended December 31, 2011 primarily as a result of an increase in our development and redevelopment activity, which resulted in higher average asset balances qualifying for interest capitalization. We anticipate capitalized interest to continue to increase in the upcoming year due to increased development and redevelopment activity that commenced in 2012 (see "Factors That May Influence Future Results of Operations" for additional information)

Year Ended December 31, 2011 Compared to Year Ended December 31, 2010

The prior year discussion of the results from operations is separated into following property groups:

• Same Store Properties - which includes the results of all of the office properties that were owned and included in our stabilized portfolio as of January 1, 2010 and still owned and included in the stabilized portfolio as of December 31, 2012;

• Acquisition Properties - which includes the results, from the dates of acquisition through the periods presented, for the ten office buildings we acquired in 2011 and the ten office buildings we acquired during 2010;

• Other Properties - which includes the results of properties not included in our stabilized portfolio. These properties consist of two office buildings that were moved from the stabilized portfolio during 2010, one office property that was moved from the stabilized portfolio during 2011, one redevelopment project under construction and one office building that was moved from the stabilized portfolio during 2012 to development since the property is being repositioned.

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The following table sets forth certain information regarding the property groups within our stabilized portfolio as of December 31, 2011:

Group	# of Buildings	Rentable Square Feet
Same Store Properties	78	7,422,273
Acquisition Properties(1)	20	3,645,009
Total Stabilized Portfolio(2)	98	11,067,282

 _______________________

(1) Includes the ten office buildings we acquired in 2011 and the ten office buildings we acquired during 2010.

(2) We had no stabilized redevelopment properties in our stabilized portfolio during the comparison period.

The following table reconciles our Net Operating Income, as defined, to our net income for the years ended December 31, 2011 and 2010.

	Year Ended December 31,						Dollar Change			Percentage Change
	2011			2010
	($ in thousands)
Reconciliation to Net Income:
Net Operating Income, as defined	$	238,615		$	179,302		$	59,313		33.1	%
Unallocated (expense) income:
General and administrative expenses	(28,148		)	(27,963		)	(185		)	0.7
Acquisition-related expenses	(4,053		)	(2,248		)	(1,805		)	80.3
Depreciation and amortization	(124,928		)	(90,836		)	(34,092		)	37.5
Interest income and other net investment gains	571			964			(393		)	(40.8	)
Interest expense	(85,785		)	(55,082		)	(30,703		)	55.7
Loss on early extinguishment of debt	—			(4,564		)	4,564			100.0
Loss from continuing operations	(3,728		)	(427		)	(3,301		)	773.1	%
Income from discontinued operations	19,630			19,364			266			1.4	%
Net gain on dispositions of discontinued operations	51,587			949			50,638			5,335.9	%
Net income	$	67,489		$	19,886		$	47,603		239.4	%

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The following tables summarize the Net Operating Income, as defined, for our total portfolio for the years ended December 31, 2011 and 2010.

	2011									2010
	Same Store		Acquisition Properties		Other			Total		Same Store		Acquisition Properties		Other		Total
	($ in thousands)									($ in thousands)
Operating revenues:
Rental income	$	211,063	$	94,520	$	1,535		$	307,118	$	201,633	$	28,901	$	4,770	$	235,304
Tenant reimbursements	16,437		7,287		253			23,977		16,212		471		1,313		17,996
Other property income	5,935		569		30			6,534		1,288		106		300		1,694
Total	233,435		102,376		1,818			337,629		219,133		29,478		6,383		254,994
Property and related  expenses:
Property expenses	41,907		23,524		1,390			66,821		41,485		7,045		2,639		51,169
Real estate taxes	17,890		10,112		1,631			29,633		18,529		3,033		1,912		23,474
Provision for bad debts	781		—		—			781		65		—		—		65
Ground leases	1,136		446		197			1,779		972		—		12		984
Total	61,714		34,082		3,218			99,014		61,051		10,078		4,563		75,692
Net Operating Income, as defined	$	171,721	$	68,294	$	(1,400	)	$	238,615	$	158,082	$	19,400	$	1,820	$	179,302

	Year Ended December 31, 2011 as compared to the Year Ended December 31, 2010
	Same Store					Acquisition Properties				Other					Total
	Dollar Change			% Change		Dollar Change		% Change		Dollar Change			% Change		Dollar Change		% Change
	($ in thousands)
Operating revenues:
Rental income	$	9,430		4.7	%	$	65,619	227.0	%	$	(3,235	)	(67.8	)%	$	71,814	30.5	%
Tenant reimbursements	225			1.4		6,816		1,447.1		(1,060		)	(80.7	)	5,981		33.2
Other property income	4,647			360.8		463		436.8		(270		)	(90.0	)	4,840		285.7
Total	14,302			6.5		72,898		247.3		(4,565		)	(71.5	)	82,635		32.4
Property and related  expenses:
Property expenses	422			1.0		16,479		233.9		(1,249		)	(47.3	)	15,652		30.6
Real estate taxes	(639		)	(3.4	)	7,079		233.4		(281		)	(14.7	)	6,159		26.2
Provision for bad debts	716			1,101.5		—		—		—			—		716		1,101.5
Ground leases	164			16.9		446		100.0		185			1,541.7		795		80.8
Total	663			1.1		24,004		238.2		(1,345		)	(29.5	)	23,322		30.8
Net Operating Income, as defined	$	13,639		8.6	%	$	48,894	252.0	%	$	(3,220	)	(176.9	)%	$	59,313	33.1	%

Net Operating Income increased $59.3 million, or 33.1%, for the year ended December 31, 2011 as compared to the year ended December 31, 2010 primarily resulting from:

• An increase of $48.9 million attributable to the Acquisition Properties;

• An increase of $13.6 million attributable to the Same Store Properties primarily resulting from:

• An increase of $9.4 million in rental income primarily resulting from an increase in average occupancy of 5.6%, from 86.4% for the year ended December 31, 2010, to 92.0% for the year ended December 31, 2011;

• An increase in other property income primarily due to the receipt of a $4.3 million cash distribution under a bankruptcy claim related to a former tenant that defaulted on its lease in 2009;

• A decrease in real estate taxes of $0.6 million due to successful property tax appeals and lower than expected supplemental tax increases;

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• An offsetting increase in our provision for bad debts of $0.7 million primarily as a result of changes in our estimates of collectability for two watchlist tenants; and

• An offsetting decrease of $3.2 million related to one office building that was moved from the stabilized portfolio to the redevelopment portfolio in 2010 and two office buildings that were moved to the redevelopment portfolio from the stabilized portfolio upon commencement of redevelopment in 2011. The reduction in Net Operating Income is due to the expiration of the leases at two of the office buildings. Upon expiration of these leases, we commenced redevelopment of these properties. We successfully completed the redevelopment of two of the office buildings in 2012 and moved them back into our stabilized portfolio during the fourth quarter of 2012. The third office building was in "lease-up" as of December 31, 2012.

Other Income and Expenses

General and Administrative Expense

General and administrative expenses increased $0.2 million, or 0.7%, for the year ended December 31, 2011 compared to the year ended December 31, 2010 primarily as a result of a net increase in compensation expense.

Depreciation and Amortization Expense

Depreciation and amortization expense increased $34.1 million, or 37.5%, for the year ended December 31, 2011 compared to the year ended December 31, 2010 primarily related to the Acquisition Properties.

Interest Income and Other Net Investment Gains

Total interest income and other net investment gains decreased by approximately $0.4 million, or 40.8%, for the year ended December 31, 2011 compared to the year ended December 31, 2010, primarily as a result of a decrease in the fair value of the marketable securities held in connection with our deferred compensation plan (see Note 16 to our consolidated financial statements included in this report for additional information).

Interest Expense

The following table sets forth our gross interest expense from continuing operations, including debt discounts/premiums and loan cost amortization, net of capitalized interest, including capitalized debt discounts/premiums and loan cost amortization for the years ended December 31, 2011 and 2010.

	2011			2010			Dollar Change		Percentage Change
	($ in thousands)
Gross interest expense	$	94,915		$	65,097		$	29,818	45.8	%
Capitalized interest	(9,130		)	(10,015		)	885		(8.8	)%
Interest expense	$	85,785		$	55,082		$	30,703	55.7	%

Gross interest expense, before the effect of capitalized interest, increased $29.8 million, or 45.8%, for the year ended December 31, 2011 compared to the year ended December 31, 2010 resulting from an increase in our average outstanding debt balances primarily as a result of our acquisition activity.

Capitalized interest decreased $0.9 million, or 8.8% for the year ended December 31, 2011 compared to the year ended December 31, 2010 primarily attributable to a decrease in our average development and redevelopment asset balances qualifying for interest capitalization for 2011 as compared to 2010.

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Liquidity and Capital Resources of the Company

In this "Liquidity and Capital Resources of the Company" section, the term the "Company" refers only to Kilroy Realty Corporation on an unconsolidated basis, and excludes the Operating Partnership and all other subsidiaries.

The Company's business is operated primarily through the Operating Partnership. Distributions from the Operating Partnership are the Company's source of capital. The Company believes the Operating Partnership's sources of working capital, specifically its cash flow from operations and borrowings available under its revolving credit facility, are adequate for it to make its distribution payments to the Company and, in turn, for the Company to make its dividend payments to its preferred and common stockholders for the next 12 months. Cash flows from operating activities generated by the Operating Partnership for the year ended December 31, 2012 were sufficient to cover the Company's payment of cash dividends to its stockholders. However, there can be no assurance that the Operating Partnership's sources of capital will continue to be available at all or in amounts sufficient to meet its needs, including its ability to make distributions to the Company. The unavailability of capital could adversely affect the Operating Partnership's ability to make distributions to the Company, which would in turn, adversely affect the Company's ability to pay cash dividends to its stockholders.

The Company is a well-known seasoned issuer, and the Company and the Operating Partnership have an effective shelf registration statement that provides for the public offering and sale from time to time by the Company of its preferred stock, common stock, debt securities and guarantees of debt securities and by the Operating Partnership of its debt securities, in each case in unlimited amounts. The Company evaluates the capital markets on an ongoing basis and, as circumstances warrant, the Company and the Operating Partnership may issue securities of all of these types in one or more offerings at any time and from time to time on an opportunistic basis, depending upon, among other things, market conditions, available pricing and capital needs. When the Company receives proceeds from the sales of its preferred or common stock, it is required by the Operating Partnership's partnership agreement to contribute the net proceeds from those sales to the Operating Partnership in exchange for corresponding preferred or common units of the Operating Partnership. The Operating Partnership may use these proceeds and proceeds from the sale of its debt securities to repay debt, including borrowings under its revolving credit facility, to develop new or existing properties, to make acquisitions of properties or portfolios of properties, or for general corporate purposes.

As the sole general partner with control of the Operating Partnership, the Company consolidates the Operating Partnership for financial reporting purposes, and the Company does not have significant assets other than its investment in the Operating Partnership. Therefore, the assets and liabilities and the revenues and expenses of the Company and the Operating Partnership are substantially the same on their respective financial statements. The section entitled "Liquidity and Capital Resources of the Operating Partnership" should be read in conjunction with this section to understand the liquidity and capital resources of the Company on a consolidated basis and how the Company is operated as a whole.

Distribution Requirements

The Company is required to distribute 90% of its taxable income (subject to certain adjustments and excluding net capital gain) on an annual basis to maintain qualification as a REIT for federal income tax purposes and is required to pay income tax at regular corporate rates to the extent it distributes less than 100% of its taxable income (including capital gains). As a result of these distribution requirements, the Operating Partnership cannot rely on retained earnings to fund its on−going operations to the same extent as other companies whose parent companies are not REITs. In addition, the Company may be required to use borrowings under the Operating Partnership's revolving credit facility, if necessary, to meet REIT distribution requirements and maintain its REIT status. The Company may also need to continue to raise capital in the equity markets to fund the Operating Partnership's working capital needs, as well as potential developments of new or existing properties or acquisitions.

The Company intends to continue to make, but has not committed to make, regular quarterly cash distributions to common stockholders and common unitholders from cash flow from operating activities. All such distributions are at the discretion of the board of directors. The Company has historically distributed amounts in excess of our taxable income resulting in a return of capital to its stockholders and the Company currently believes it has the ability to maintain distributions at the 2012 levels to meet its REIT requirements for 2013. The Company considers market factors and its performance in addition to REIT requirements in determining our distribution levels. Amounts accumulated for distribution to stockholders are invested primarily in interest−bearing accounts and short−term interest−bearing securities, which are consistent with the Company's intention to maintain its qualification as a REIT. Such investments may include, for example, obligations of the Government National Mortgage Association, other governmental agency securities, certificates of deposit, and interest−bearing bank deposits.

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On December 6, 2012, the Board of Directors declared a regular quarterly cash dividend of $0.35 per common share payable on January 15, 2013 to stockholders of record on December 31, 2012 and caused a $0.35 per Operating Partnership common unit cash distribution to be paid in respect of the Operating Partnership's common limited partnership interests, including those owned by the Company. These dividends and distributions are equivalent to an annual rate of $1.40 per share, which in aggregate totals approximately $108.9 million of annualized common dividends and distributions per year based on shares of common stock, RSUs, and common units outstanding at December 31, 2012.

On March 27, 2012 and August 6, 2012, the Company issued 4,000,000 shares of its 6.875% Series G Cumulative Redeemable Preferred Stock ("Series G Preferred Stock") and 4,000,000 shares of its 6.375% Series H Cumulative Redeemable Preferred Stock ("Series H Preferred Stock"), respectively, at a public offering price of $25.00 per share, for a total of approximately $96.2 million of net proceeds for each offering, after deducting underwriting discounts and other offering-related costs. The net proceeds were used to redeem preferred stock and units as discussed below. Dividends on the Series G Preferred Stock and the Series H Preferred Stock are paid quarterly in arrears on the 15th day of each February, May, August and November and began on May 15, 2012 and November 15, 2012, respectively. On December 6, 2012, the Board of Directors declared a dividend of $0.4296875 per share on the Series G Preferred Stock and $0.3984375 per share on the Series H Preferred Stock for the period commencing on and including November 15, 2012, and ending on and including February 14, 2013. The dividend will be paid on February 15, 2013, to Series G Preferred and Series H Preferred stockholders of record on January 31, 2013. Dividends and distributions payable to the Series G and Series H Preferred stockholders, total approximately $13.3 million of annualized preferred dividends and distributions.

On August 15, 2012 (the "Series A Redemption Date"), the Operating Partnership redeemed all 1,500,000 outstanding 7.45% Series A Cumulative Redeemable Preferred Units representing preferred limited partnership interests in the Operating Partnership ("Series A Preferred Units"). On the Series A Redemption Date, the Series A Preferred Units were redeemed at a redemption price equal to $50.00 per unit, representing $75.0 million in aggregate, plus all accrued and unpaid distributions to the Series A Redemption Date. We have no further distribution requirements with respect to the Series A Preferred Units.

On April 16, 2012 (the "Series E and F Redemption Date"), the Company redeemed all 1,610,000 outstanding shares of its 7.80% Series E Cumulative Redeemable Preferred Stock ("Series E Preferred Stock") and all 3,450,000 outstanding shares of its 7.50% Series F Cumulative Redeemable Preferred Stock ("Series F Preferred Stock"). On the Series E and F Redemption Date, the shares of Series E and Series F Preferred Stock (together, the "Redeemed Preferred Stock") were redeemed at a redemption price equal to their stated liquidation preference of $25.00 per share plus $2.9 million of dividends, which included $0.5 million of additional dividends attributable to the acceleration of the Series E Preferred Stock and Series F Preferred Stock dividend payment from April 1, 2012 to April 16, 2012 and redemption-related costs. We have no further distribution requirements with respect to the Series E and Series F Preferred Stock.

Debt Covenants

     The covenants contained within the revolving credit facility and the term loan facility prohibit the Company from paying dividends in excess of 95% of FFO.

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Capitalization

     As of December 31, 2012, our total debt as a percentage of total market capitalization was 34.7% and our total debt and liquidation value of our preferred equity as a percentage of total market capitalization was 38.1%, which was calculated based on the closing price per share of the Company's common stock of $47.37 on December 31, 2012 as shown in the table below.

	Shares/Units at December 31, 2012	Aggregate Principal Amount or  $ Value  Equivalent		% of Total  Market  Capitalization
Debt:		($ in thousands)
Unsecured Revolving Credit Facility		$	185,000	3.1	%
Unsecured Term Loan Facility		150,000		2.6
4.25% Exchangeable Notes due 2014 (2)		172,500		2.9
Unsecured Senior Notes due 2014		83,000		1.4
Unsecured Senior Notes due 2015 (2)		325,000		5.5
Unsecured Senior Notes due 2018 (2)		325,000		5.5
Unsecured Senior Notes due 2020 (2)		250,000		4.3
Secured debt (1) (2)		553,919		9.4
Total debt		$	2,044,419	34.7	%
Equity and Noncontrolling Interests:
6.875% Series G Cumulative Redeemable Preferred stock (3)	4,000,000	100,000		1.7
6.375% Series H Cumulative Redeemable Preferred stock (3)	4,000,000	100,000		1.7
Common limited partnership units outstanding (4)(5)	1,826,503	86,521		1.5
Common shares outstanding (5)	74,926,981	3,549,291		60.4
Total equity and noncontrolling interests		3,835,812		65.3
Total Market Capitalization (1)		$	5,880,231	100.0	%

 _______________

(1) At December 31, 2012, the Company had restricted cash balances on its consolidated balance sheet of approximately $247.5 million primarily due to disposition proceeds that were temporarily being held at a qualified intermediary, per our direction, for the purpose of facilitating Section 1031 Exchanges under the Code.  Subsequent to December 31, 2012, we completed the Section 1031 Exchanges and the restricted cash balances were released and used for general corporate purposes, which included repaying an $83.1 million secured mortgage loan that was scheduled to mature on April 1, 2013, repaying borrowings under the Operating Partnership's revolving credit facility, as well as acquiring a two building office complex in Seattle, Washington for approximately $170.0 million that included the assumption of an approximate $83.9 million mortgage.  In addition, on January 14, 2013, the Operating Partnership issued $300.0 million of 3.8% senior unsecured notes due 2023 and used the proceeds from the offering to repay the remaining outstanding balance on the Operating Partnership's revolving credit facility.  As a result of the aforementioned transactions, the Company had a cash balance of approximately $150 million, a restricted cash balance of approximately $19 million, and no outstanding borrowings under the Operating Partnership's revolving credit facility as of January 30, 2013.

(2) Represents gross aggregate principal amount due at maturity before the effect of the unamortized discounts and premiums as of December 31, 2012.

(3) Value based on $25.00 per share liquidation preference.

(4) Represents common units not owned by the Company.

(5) Value based on closing price per share of the Company's common stock of $47.37 as of December 31, 2012. 

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Liquidity and Capital Resources of the Operating Partnership

     In this "Liquidity and Capital Resources of the Operating Partnership" section, the terms "we," "our," and "us" refer to the Operating Partnership or the Operating Partnership and the Company together, as the context requires.

General

Our primary liquidity sources and uses are as follows:

Liquidity Sources

• Net cash flow from operations;

• Borrowings under the revolving credit facility;

• Proceeds from additional secured or unsecured debt financings;

• Proceeds from public or private issuance of debt or equity securities; and

• Proceeds from the disposition of nonstrategic assets through our capital recycling program.

Liquidity Uses

• Property or undeveloped land acquisitions;

• Property operating and corporate expenses;

• Capital expenditures, tenant improvement and leasing costs;

• Debt service and principal payments, including debt maturities;

• Distributions to common and preferred security holders;

• Development and redevelopment costs; and

• Outstanding debt repurchases.

General Strategy

Our general strategy is to maintain a conservative balance sheet with a top credit profile and to maintain a capital structure that allows for financial flexibility and diversification of capital resources. We manage our capital structure to reflect a long-term investment approach and utilize multiple sources of capital to meet our long-term capital requirements. We believe that our current projected liquidity requirements for the next 12-month period, as set forth above under the caption " —Liquidity Uses," will be satisfied using a combination of the liquidity sources listed above. We believe our conservative leverage and staggered debt maturities provide us with financial flexibility and enhances our ability to obtain additional sources of liquidity if necessary, and, therefore, we are well−positioned to refinance or repay maturing debt and to pursue our strategy of seeking attractive acquisition opportunities, which we may finance, as necessary, with future public and private issuances of debt and equity securities.

Summary of 2012 Funding Transactions

We have been active in the capital markets, loan originations and assumptions, and our capital recycling program to finance our acquisition activity and our continued desire to improve our debt maturities and lower our overall weighted average cost of capital. This was primarily as a result of the following transactions:

Capital Markets

• During 2012, we issued 787,118 shares under our at−the−market stock program. The net offering proceeds of approximately $36.3 million, after deducting sales agent compensation, were contributed to the Operating Partnership (see "— Liquidity Sources" below for additional information).

• In August 2012, the Company issued 4,000,000 shares of its 6.375% Series H Preferred Stock at a public offering price of $25.00 per share. The net proceeds of $96.2 million, after deducting the underwriting discount and other offering-related costs, were contributed to the Operating Partnership (see Notes 10 and 11 to our consolidated financial statements included in this report for additional information).

• In August 2012, the Company completed an underwritten public offering of 5,750,000 shares of its common stock. The net offering proceeds of approximately $253.8 million, after deducting underwriting discounts and commissions and offering expenses, were contributed to the Operating Partnership (see Notes 10 and 11 to our consolidated financial statements included in this report for additional information).

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• In August 2012, the Operating Partnership redeemed all 1,500,000 outstanding Series A Preferred Units at a redemption price equal to $50.00 per unit, representing $75.0 million in aggregate, plus all accrued and unpaid distributions up to and including the redemption date of August 15, 2012 (see Notes 9 and 11 to our consolidated financial statements included in this report for additional information).

• In April 2012, the Company redeemed all 1,610,000 outstanding shares of its Series E Preferred Stock and all 3,450,000 outstanding shares of its Series F Preferred Stock at a redemption price of $25.00 per share plus all accumulated and unpaid dividends up to and including the redemption date of April 16, 2012, for total payment of $129.4 million (see Note 10 to our consolidated financial statements included in this report for additional information).

• In March 2012, the Company issued 4,000,000 shares of its 6.875% Series G Preferred Stock at a public offering price of $25.00 per share. The net proceeds of $96.2 million, after deducting the underwriting discount and other accrued offering-related costs, were contributed to the Operating Partnership (see Notes 10 and 11 to our consolidated financial statements included in this report for additional information).

• In February 2012, the Company completed an underwritten public offering of 9,487,500 shares of its common stock. The net offering proceeds of approximately $382.1 million, after deducting underwriting discounts and commissions and offering expenses, were contributed to the Operating Partnership (see Notes 10 and 11 to our consolidated financial statements included in this report for additional information).

Debt Activity

• In November 2012, the Operating Partnership completed an amendment to its $500 million unsecured revolving credit facility, which reduced the interest rate and borrowing costs and extended the maturity date to April 3, 2017. The revolving credit facility now bears interest at LIBOR plus 1.45% and includes a 30 basis point facility fee.

• During the year ended December 31, 2012, the Operating Partnership assumed four secured mortgage loans with a combined principal balance of $212.2 million and a combined premium balance of $8.9 million in connection with four acquisitions. The Operating Partnership also obtained a $97.0 million secured mortgage loan and repaid two secured mortgage loans with a combined outstanding principal balance of $101.0 million that were scheduled to mature in August 2012 (see Notes 3 and 7 to our consolidated financial statements included in this report for additional information).

• In April 2012, the Operating Partnership repaid its 3.25% Exchangeable Notes with an aggregate principal amount of $148.0 million and entered into a new $150.0 million unsecured term loan facility in March 2012 (see Note 7 to our consolidated financial statements included in this report for additional information).

Capital Recycling Program

• During the year ended December 31, 2012, the Company completed the sale of its entire industrial portfolio, which was comprised of 39 industrial properties, and seven office buildings with a combined total 3,975,665 rentable square feet for a total gross sales price of $500.3 million (see Note 17 to our consolidated financial statements included in this report for additional information). As of December 31, 2012, approximately $228.8 million of the sales proceeds were included in restricted cash on our consolidated balance sheet for the purpose of facilitating Section 1031 Exchanges.

Capital Events Subsequent to December 31, 2012

• As a result of the aforementioned events discussed above, we ended the year with restricted cash of $247.5 million and an outstanding balance of $185.0 million on our revolving credit facility. In January 2013, we completed two Section 1031 Exchanges and the restricted cash balances related to our fourth quarter dispositions were released and used to acquire a two building office complex in Seattle, Washington for approximately $170.0 million (the purchase price includes an assumption of debt of approximately $83.9 million) and to repay a $83.1 million secured mortgage loan that matured in the first quarter of 2013. In addition, on January 14, 2013 the Operating Partnership issued $300.0 million of its 3.800% unsecured senior notes due 2023 and used the proceeds from the offering to repay the outstanding balance on the revolving credit facility.

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Liquidity Sources

Credit Facility

In March 2012, we amended the revolving credit facility to reduce the FMV Cap Rate (as defined in the revolving credit facility agreement), which is used to calculate the fair value of our assets for certain covenants under the revolving credit facility, from 7.50% to 6.75%. In November 2012, we amended and restated the revolving credit facility to extend the maturity date and reduce the interest rate and facility fee. We previously amended our revolving credit facility in June 2011, to extend the maturity date and reduce the interest rate and facility fee. The following table summarizes the terms of our revolving credit facility as of December 31, 2011 and as amended as of December 31, 2012:

	December 31, 2012			December 31, 2011
	(in thousands)
Outstanding borrowings	$	185,000		$	182,000
Remaining borrowing capacity	315,000			318,000
Total borrowing capacity  (1)	$	500,000		$	500,000
Interest rate (2)	1.66		%	2.05		%
Facility fee - annual rate  (3)	0.300		%	0.350		%
Maturity date (4)	April 2017			August 2015

________________________

(1) We may elect to borrow, subject to bank approval, up to an additional $200.0 million under an accordion feature under the terms of the revolving credit facility.

(2) The revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.450% and 1.75% as of December 31, 2012 and December 31, 2011, respectively.

(3) The facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we also incurred debt origination and legal costs of approximately $5.0 million when we entered into the revolving credit facility in 2010, an additional $3.3 million when we amended the terms of the revolving credit facility in June 2011 and an additional $1.9 million when we amended the terms of the revolving credit facility in November 2012. The unamortized balance of these costs will be amortized through the extended maturity date of the revolving credit facility.

(4) Under the original and amended terms of the Credit Facility, we may exercise an option to extend the maturity date by one year.

We intend to borrow under the revolving credit facility from time to time for general corporate purposes, to fund potential acquisitions, to finance development and redevelopment expenditures, and to potentially repay long-term debt.

Capital Recycling Program

In connection with our capital recycling program, we continuously evaluate opportunities for the potential disposition of properties and undeveloped land in our portfolio with the intent of recycling the proceeds generated from the dispositions of non-strategic or lower return assets into capital used to fund new operating and development acquisitions, to finance development and redevelopment expenditures, to repay long-term debt and for other general corporate purposes. As part of our strategy, we intend, when practical, to enter into Section 1031 Exchanges to defer some or all of the taxable gains, if any, on the sales for federal and state income tax purposes.

During the fourth quarter ended December 31, 2012, we disposed of five office properties and our entire industrial portfolio, which was comprised of 39 industrial properties, with a combined 3,721,989 rentable square feet, for a total of approximately $354.2 million at a net gain of $186.4 million (see Note 17 to our consolidated financial statements included in this report for more information). In connection with this transaction, the dispositions were structured to qualify as Section 1031 Exchanges, and approximately $228.8 million of the sales proceeds were included in restricted cash on our consolidated balance sheet. Subsequent to December 31, 2012, we were able to successfully complete Section 1031 Exchanges and the amounts were reinvested into qualifying replacement properties (see "—Capital Events Subsequent to December 31, 2012" above for additional information).

In addition, in January 2012, we disposed of two office buildings in one transaction for approximately $146.1 million at a gain of approximately $72.8 million. We were able to successfully complete Section 1031 Exchanges for these properties and reinvest the funds into qualified replacement acquisition properties.

The timing of any potential future disposition transactions will depend on market conditions and other factors including but not limited to our capital needs and our ability to defer some or all of the taxable gains on the sales. We cannot assure you that we will dispose of any additional properties, or that future acquisitions and/or dispositions, if any, will qualify as Section 1031 Exchanges.

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At-the-Market Stock Offering Program

Under our at-the-market stock offering program, which commenced in July 2011, we may offer and sell shares of our common stock having an aggregate gross sales price of up to $200.0 million from time to time in "at the market" offerings. During the year ended December 31, 2012, we sold 787,118 shares of common stock under the program for aggregate gross proceeds of approximately $37.0 million and net proceeds of approximately $36.3 million, after sales agent compensation. The proceeds from the sales were used to fund acquisitions and general corporate purposes including repayment of borrowings under the revolving credit facility. Since commencement of the program, we have sold 1,142,423 shares of common stock and, as of December 31, 2012, approximately $150.0 million remains available to be sold under this program. Actual sales will depend upon a variety of factors including but not limited to market conditions, the trading price of the Company's common stock and our capital needs. We have no obligation to sell the remaining shares available for sale under this program.

Shelf Registration Statement

As discussed above under “-Liquidity and Capital Resources of the Company,” the Company is a well-known seasoned issuer and the Company and the Operating Partnership have an effective shelf registration statement that provides for the public offering and sale from time to time by the Company of its preferred stock, common stock, debt securities and guarantees of debt securities and by the Operating Partnership of its debt securities, in each case in unlimited amounts. The Company evaluates the capital markets on an ongoing basis and, as circumstances warrant, the Company and the Operating Partnership may issue securities of all of these types in one or more offerings at any time and from time to time on an opportunistic basis, depending upon, among other things, market conditions, available pricing and capital needs. When the Company receives proceeds from the sales of its preferred or common stock, it is required by the Operating Partnership's partnership agreement to contribute the net proceeds from those sales to the Operating Partnership in exchange for corresponding preferred or common units of the Operating Partnership. The Operating Partnership may use these proceeds and proceeds from the sale of its debt securities to repay debt, including borrowings under its revolving credit facility, to develop new or existing properties, to make acquisitions of properties or portfolios of properties, or for general corporate purposes.

Unsecured Term Loan Facility

In March 2012, we entered into a new term loan facility, which is included in unsecured debt, net on our consolidated balance sheets. The term loan facility bears interest at an annual rate of LIBOR plus 1.750% and is scheduled to mature on March 29, 2016. Under the terms of the term loan facility, we may exercise an option to extend the maturity date by one year. We may elect to borrow up to an additional $100.0 million under an accordion option, subject to bank approval. We used the borrowings under the term loan facility to repay the 3.25% Exchangeable Notes in April 2012 upon maturity.

Exchangeable Notes, Unsecured Senior Notes, and Secured Debt

The aggregate principal amount of our 4.25% Exchangeable Notes, unsecured debt, and secured debt of the Operating Partnership outstanding as of December 31, 2012 was as follows:

	Aggregate  Principal  Amount Outstanding
	($ in thousands)
Unsecured Term Loan Facility due 2016	$	150,000
4.25% Exchangeable Notes due 2014 (1)	172,500
Unsecured Senior Notes due 2014	83,000
Unsecured Senior Notes due 2015 (1)	325,000
Unsecured Senior Notes due 2018 (1)	325,000
Unsecured Senior Notes due 2020 (1)	250,000
Secured Debt (1)	553,919
Total Exchangeable Notes, Unsecured Senior Notes, and Secured Debt	$	1,859,419

 _______________

(1) Represents gross aggregate principal amount before the effect of the unamortized discounts and premiums as of December 31, 2012.

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On January 14, 2013, the Operating Partnership issued $300.0 million of 3.8% unsecured senior notes due 2023 and used the proceeds from the offering to repay the remaining outstanding balance on the Operating Partnership's revolving credit facility. 

Debt Composition

The composition of the Operating Partnership's aggregate debt balances between secured and unsecured and fixed-rate and variable-rate debt as of December 31, 2012 and 2011 was as follows:   

	Percentage of Total Debt				Weighted Average Interest Rate
	2012		2011		2012		2011
Secured vs. unsecured:
Unsecured (1)	72.9	%	80.9	%	4.5	%	4.7	%
Secured	27.1		19.1		5.2		5.2
Variable-rate vs. fixed-rate:
Variable-rate	16.4		9.9		1.8		2.0
Fixed-rate (1)	83.6		90.1		5.3		5.1
Total stated rate(1)					4.7		4.8
GAAP effective rate (2)					4.7		5.2
Total GAAP effective rate including debt issuance costs					5.1	%	5.6	%

 _______________

(1) Excludes the impact of the amortization of any debt discounts/premiums.

(2)    Includes the impact of the amortization of any debt discounts/premiums, excluding debt issuance costs.

Liquidity Uses

Contractual Obligations

The following table provides information with respect to our contractual obligations as of December 31, 2012. The table: (i) indicates the maturities and scheduled principal repayments of our secured debt, 4.25% Exchangeable Notes, unsecured debt, and revolving credit facility; (ii) indicates the scheduled interest payments of our fixed-rate and variable-rate debt as of December 31, 2012; (iii) provides information about the minimum commitments due in connection with our ground lease obligations and other lease and contractual commitments; and (iv) provides estimated redevelopment and development commitments as of December 31, 2012. Note that the table does not reflect our available debt maturity extension options and reflects gross aggregate principal amounts before the effect of unamortized discounts/premiums.

	Payment Due by Period
	Less than 1 Year (2013)		1–3 Years (2014-2015)		3–5 Years (2016-2017)		More than 5 Years (After 2017)		Total
	(in thousands)
Principal payments—secured debt (1)	$	90,881	$	77,124	$	167,858	$	218,056	$	553,919
Principal payments—4.25% Exchangeable Notes (2)	—		172,500		—		—		172,500
Principal payments—unsecured debt (3)	—		408,000		150,000		575,000		1,133,000
Principal payments—Credit Facility	—		—		185,000		—		185,000
Interest payments—fixed-rate debt (4)	86,024		150,021		89,550		87,717		413,312
Interest payments—variable-rate debt (5)	6,581		13,162		5,252		—		24,995
Ground lease obligations (6)	3,685		6,190		6,190		160,007		176,072
Lease and contractual commitments (7)	76,976		3,791		—		—		80,767
Development and redevelopment commitments (8)	239,000		282,000		—		—		521,000
Total	$	503,147	$	1,112,788	$	603,850	$	1,040,780	$	3,260,565

________________________

(1) Represents gross aggregate principal amount before the effect of the unamortized premium of approximately $7.2 million as of December 31, 2012.

(2) Represents gross aggregate principal amount before the effect of the unamortized discount of approximately $8.6 million as of December 31, 2012.

(3) Represents gross aggregate principal amount before the effect of the unamortized discount of approximately $2.1 million as of December 31, 2012.

(4) As of December 31, 2012, 83.6% of our debt was contractually fixed. The information in the table above reflects our projected interest rate obligations for these fixed-rate payments based on the contractual interest rates, interest payment dates, and scheduled maturity dates.

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(5) As of December 31, 2012, 16.4% of our debt bore interest at variable rates all of which was incurred under the term loan facility and revolving credit facility. The variable interest rate payments are based on LIBOR plus a spread of 1.450% and 1.750% as of December 31, 2012, respectively per facility. The information in the table above reflects our projected interest rate obligations for these variable-rate payments based on outstanding principal balances as of December 31, 2012, the scheduled interest payment dates, and the contractual maturity dates.

(6) Reflects minimum lease payments as discussed in Note 15 to our consolidated financial statements, through the contractual lease expiration date before the impact of extension options.

(7) Amounts represent commitments under signed leases and contracts for operating properties, excluding tenant-funded tenant improvements. The timing of these expenditures may fluctuate.

(8) Amounts represent commitments under signed leases for pre-leased development projects and contractual commitments for redevelopment contracts and projects under construction as of December 31, 2012 and trailing costs for stabilized redevelopment properties. The timing of these expenditures may fluctuate based on the ultimate progress of construction. This table also reflects the November 2012 exercise of the purchase option to acquire the land under a ground lease at one of our redevelopment properties in the second quarter of 2013 for a purchase price of $27.5 million to be paid upon closing. See Note 15 to our consolidated financial statements included in this report for additional information.

Potential Future Capital Requirements

Debt Maturities

As of December 31, 2012, we had one secured loan with a principal balance of $83.1 million scheduled to mature in 2013, which we repaid subsequent to year-end with a portion of the remaining proceeds from the sale of our industrial portfolio.

Potential Future Acquisitions

In 2011, we acquired 11 buildings for approximately $603.3 million in cash. In 2012, we acquired 14 buildings for approximately $454.8 million in cash, all of which we funded through various capital raising activities, and in selected instances, the assumption of existing indebtedness. In addition, in 2012 we acquired six development property project opportunities for approximately $333.9 million in cash and other assumed liabilities Subsequent to December 31, 2012, we acquired a two building office complex in Seattle, Washington for approximately $170.0 million with a portion of the remaining proceeds from the sale of our industrial portfolio. We continually evaluate selected acquisition opportunities as they arise. As a result, at any point in time, we may have one or more potential acquisitions under consideration that are in varying stages of evaluation, negotiation or due diligence review, which may include potential acquisitions under contract. We expect that any material acquisitions will be funded with borrowings under our revolving credit facility, the public or private issuance of debt or equity securities, or through the disposition of assets under our capital recycling program.

Redevelopment and Development Opportunities

As of December 31, 2012, we had one redevelopment and four development projects under construction. These projects have a total estimated investment of approximately $988.8 million, of which we have incurred approximately $411.3 million as of December 31, 2012. Of the remaining $577.5 million yet to be incurred, we are currently contractually obligated to payapproximately $239.0 million over the next year, which are included in our contractual obligations table above. We may also incur up to approximately $8.7 million in additional leasing related costs for these projects over the next year, depending on leasing activity. In addition, we currently have additional development and redevelopment projects that are scheduled to commence construction in 2013. If these projects commence as currently projected, we will invest between $80 million and $100 million in addition to the above commitments. This estimate is based on market conditions and our anticipation of project approvals. Actual costs could vary depending on changes in circumstances. Ultimate timing of these expenditures may fluctuate given the ultimate progress and leasing status of the projects.

Potential Future Leasing Costs and Capital Improvements

Given the current economic conditions, the amounts we are required to spend on tenant improvements and leasing costs would need to remain at current levels for us to be able to execute leases at current market terms, as evidenced in the table below. The amounts we ultimately incur for tenant improvements and leasing costs will depend on actual leasing activity. Tenant improvements and leasing costs generally fluctuate in any given period depending on factors such as the type of property, the term of the lease, the type of the lease, the involvement of external leasing agents, and overall market conditions. Capital expenditures may fluctuate in any given period subject to the nature, extent, and timing of improvements required to maintain our properties.

We believe we could spend between $45 to $65 million in capital improvements, tenant improvements, and leasing costs in 2013 for properties within our stabilized portfolio, depending on leasing activity, in addition to approximately $77 million of lease and contractual commitments discussed in our capital commitments table above.

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The following tables set forth our historical actual capital expenditures, and tenant improvements and leasing costs for deals commenced, excluding tenant-funded tenant improvements, for renewed and re-tenanted space within our stabilized portfolio for each of the three years during the period ended December 31, 2012 on a per square foot basis.

	Year Ended December 31,
	2012		2011		2010
Office Properties:
Capital Expenditures:
Capital expenditures per square foot	$	0.78	$	0.71	$	1.36
Tenant Improvement and Leasing Costs (1)
Replacement tenant square feet	607,118		468,530		637,155
Tenant improvements per square foot commenced	$	31.75	$	24.95	$	28.03
Leasing commissions per square foot commenced	$	11.22	$	11.46	$	9.30
Total per square foot	$	42.97	$	36.41	$	37.33
Renewal tenant square feet	629,664		709,427		691,531
Tenant improvements per square foot commenced	$	9.63	$	27.73	$	12.67
Leasing commissions per square foot commenced	$	7.91	$	9.27	$	8.31
Total per square foot	$	17.53	$	37.00	$	20.98
Total per square foot per year	$	5.30	$	4.01	$	5.49
Average remaining lease term (in years)	5.7		9.2		5.3

________________________

(1) Includes only tenants with lease terms of 12 months or longer. Excludes leases for month-to-month and first generation tenants.

     Capital expenditures per square foot increased moderately in 2012. As all of our properties are well-maintained and do not require significant capital improvements, we currently anticipate future capital expenditure levels to be consistent with historical levels. The 2012 increase in replacement tenant improvements per square foot commenced is primarily due to increased activity in San Diego and San Francisco, which command higher lease and tenant improvement rates. The 2012 decrease in renewal tenant improvements per square foot commenced is primarily due to the commencement of one significant lease renewal in 2011. Excluding this one lease, office tenant improvements per square foot leased would be materially consistent with the previous year.

Distribution Requirements

For a discussion of our dividend and distribution requirements, see "Liquidity and Capital Resources of the Company - Distribution Requirements."

Other Potential Future Liquidity Uses

As of the filing date, we are in various stages of negotiation on other potential future acquisition opportunities, including potential joint venture opportunities. We expect that any material acquisitions or development activities will be funded with borrowings under our revolving credit facility, the public or private issuance of debt or equity securities, the disposition of assets under our capital recycling program or through the assumption of existing debt.

In addition, the amounts we are required to spend on tenant improvements and leasing costs we ultimately incur will depend on actual leasing activity. Tenant improvements and leasing costs generally fluctuate in any given period depending on factors such as the type of property, the term of the lease, the type of the lease, the involvement of external leasing agents, and overall market conditions. Capital expenditures may fluctuate in any given period subject to the nature, extent, and timing of improvements required to maintain or improve our properties.

Factors That May Influence Future Sources of Capital and Liquidity of the Company and Operating Partnership

We continue to evaluate sources of financing for our business activities, including borrowings under the revolving credit facility, issuance of public and private equity securities, unsecured debt and fixed-rate secured mortgage financing, and proceeds from the disposition of nonstrategic assets through our capital recycling program. However, the Operating Partnership's ability to obtain new financing or refinance existing borrowings on favorable terms could be impacted by various factors, including the state of economic conditions, the state of the credit and equity markets, significant tenant defaults, a decline in the demand for office properties, a decrease in market rental rates or market values of real estate assets in our submarkets, and the amount of future borrowings. These events could result in the following:

• Decreases in our cash flows from operations, which could create further dependence on our revolving credit facility;

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• An increase in the proportion of variable-rate debt, which could increase our sensitivity to interest rate fluctuations in the future; and

• A decrease in the value of our properties, which could have an adverse effect on the Operating Partnership's ability to incur additional debt, refinance existing debt at competitive rates, or comply with its existing debt obligations.

In addition to the factors noted above, the Operating Partnership's credit ratings are subject to ongoing evaluation by credit rating agencies and may be changed or withdrawn by a rating agency in the future if, in its judgment, circumstances warrant. In the event that the Operating Partnership's credit ratings are downgraded, we may incur higher borrowing costs and may experience difficulty in obtaining additional financing or refinancing existing indebtedness.

Debt Covenants

The revolving credit facility, term loan facility, unsecured senior notes, and certain other secured debt arrangements contain covenants and restrictions requiring us to meet certain financial ratios and reporting requirements. Key existing financial covenants and their covenant levels include:

Credit Facility and Unsecured Term Loan Facility (as defined in the Credit Agreement):	Covenant Level	Actual Performance at December 31, 2012 (1)
Total debt to total asset value	less than 60%	36%
Fixed charge coverage ratio	greater than 1.5x	2.5x
Unsecured debt ratio	greater than 1.67x	2.45x
Unencumbered asset pool debt service coverage	greater than 2.0x	3.3x
Unsecured Senior Notes due 2015, 2018 and 2020 (as defined in the Indentures):
Total debt to total asset value	less than 60%	40%
Interest coverage	greater than 1.5x	3.6x
Secured debt to total asset value	less than 40%	11%
Unencumbered asset pool value to unsecured debt	greater than 150%	268%

________________________

(1) In March 2012, we amended the revolving credit facility to reduce the FMV Cap Rate (as defined in the revolving credit facility), which is used to calculate the fair value of our assets for certain covenants under the revolving credit facility, from 7.50% to 6.75%.

The Operating Partnership was in compliance with all its debt covenants as of December 31, 2012. Our current expectation is that the Operating Partnership will continue to meet the requirements of its debt covenants in both the short and long term. However, in the event of an economic slowdown or continued volatility in the credit markets, there is no certainty that the Operating Partnership will be able to continue to satisfy all the covenant requirements.

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Historical Cash Flow Summary

Our historical cash flow activity for the year ended December 31, 2012 as compared to the year ended December 31, 2011 was as follows:

	Year Ended December 31,
	2012			2011			Dollar Change			Percentage Change
	($ in thousands)
Net cash provided by operating activities	$	180,724		$	138,256		$	42,468		30.7	%
Net cash used in investing activities	(706,506		)	(634,283		)	(72,223		)	11.4
Net cash provided by financing activities	537,705			485,964			51,741			10.6

Operating Activities

Our cash flows from operations depends on numerous factors including the occupancy level of our portfolio, the rental rates achieved on our leases, the collectability of rent and recoveries from our tenants, the level of operating expenses, the impact of property acquisitions and related financing activities, and other general and administrative costs. Our net cash provided by operating activities increased by $42.5 million, or 30.7%, for the year ended December 31, 2012 compared to the year ended December 31, 2011 primarily as the result of an increase in cash Net Operating Income generated primarily from our Acquisitions Portfolio partially offset by increased interest expense attributable to the increase in our average outstanding debt balances as a result of our acquisition activity. See additional information under the capital "—Rental Operations."

Investing Activities

Our net cash used in investing activities is generally used to fund property acquisitions, recurring and nonrecurring capital expenditures for our operating properties, and development and redevelopment projects. Our net cash used in investing activities increased $72.2 million, or 11.4%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. This net increase was primarily attributable to year over year increases of approximately $185.5 million due to acquisitions, $54.8 million due to the increased activity in our redevelopment and development pipeline, $23.6 million of operating portfolio expenditures due to increased leasing activity, offset by an increase of $199.4 million of net proceeds received from dispositions.

Financing Activities

Our net cash provided by financing activities is generally impacted by our capital raising activities net of dividends and distributions paid to common and preferred security holders. Net cash provided by financing activities increased by $51.7 million, or 10.6%, for the year ended December 31, 2012 compared to the year ended December 31, 2011. We were active in the capital markets in 2012, with a net increase of approximately $71.7 million provided by our various capital raising activities. This net increase was partially offset by our year over year increase in dividend payments to common stockholders of approximately $17.4 million as a result of our increased common share count from common equity offerings. See additional information under the caption "Liquidity and Capital Resources of the Operating Partnership—Summary of 2012 Funding Transactions."

Off-Balance Sheet Arrangements

As of December 31, 2012 and as of the date this report was filed, we did not have any off-balance sheet transactions, arrangements, or obligations, including contingent obligations.

Non-GAAP Supplemental Financial Measure: Funds From Operations

We calculate FFO in accordance with the White Paper on FFO approved by the Board of Governors of NAREIT. The White Paper defines FFO as net income or loss calculated in accordance with GAAP, excluding extraordinary items, as defined by GAAP,

gains and losses from sales of depreciable real estate and impairment write−downs associated with depreciable real estate, plus real estate-related depreciation and amortization (excluding amortization of deferred financing costs and depreciation of non-real estate assets), and after adjustment for unconsolidated partnerships and joint ventures.

We believe that FFO is a useful supplemental measure of our operating performance. The exclusion from FFO of gains and losses from the sale of operating real estate assets allows investors and analysts to readily identify the operating results of the assets that form the core of our activity and assists in comparing those operating results between periods. Also, because FFO is generally recognized as the industry standard for reporting the operations of REITs, it facilitates comparisons of operating

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performance to other REITs. However, other REITs may use different methodologies to calculate FFO, and accordingly, our FFO may not be comparable to all other REITs.

Implicit in historical cost accounting for real estate assets in accordance with GAAP is the assumption that the value of real estate assets diminishes predictably over time. Since real estate values have historically risen or fallen with market conditions, many industry investors and analysts have considered presentations of operating results for real estate companies using historical cost accounting alone to be insufficient. Because FFO excludes depreciation and amortization of real estate assets, we believe that FFO along with the required GAAP presentations provides a more complete measurement of our performance relative to our competitors and a more appropriate basis on which to make decisions involving operating, financing, and investing activities than the required GAAP presentations alone would provide.

However, FFO should not be viewed as an alternative measure of our operating performance because it does not reflect either depreciation and amortization costs or the level of capital expenditures and leasing costs necessary to maintain the operating performance of our properties, which are significant economic costs and could materially impact our results from operations.

The following table presents our FFO for the years ended December 31, 2012, 2011, 2010, 2009, and 2008:

	Year ended December 31,
	2012			2011			2010			2009			2008
	(in thousands)
Net income available to common stockholders	$	249,826		$	50,819		$	4,512		$	21,794		$	29,829
Adjustments:
Net income attributable to noncontrolling common units of the Operating Partnership	6,187			1,474			178			1,025			1,886
Depreciation and amortization of real estate assets	168,687			135,467			102,898			86,825			82,491
Net gain on dispositions of discontinued operations	(259,245		)	(51,587		)	(949		)	(2,485		)	(234		)
Funds From Operations(1)	$	165,455		$	136,173		$	106,639		$	107,159		$	113,972

_______________________

(1) Reported amounts are attributable to common stockholders and common unitholders.

The following table presents our weighted average shares of common stock and common units outstanding for the years ended December 31, 2012, 2011, 2010, 2009, and 2008:

	Year Ended December 31,
	2012	2011	2010	2009	2008
Weighted average shares of common stock outstanding	69,639,623	56,717,121	49,497,487	38,705,101	32,466,591
Weighted average common units outstanding	1,763,635	1,720,323	1,723,131	1,731,095	2,065,188
Effect of participating securities—nonvested shares and restricted stock units	1,127,534	924,747	812,865	785,582	372,444
Total basic weighted average shares / units outstanding	72,530,792	59,362,191	52,033,483	41,221,778	34,904,223
Effect of dilutive securities—Exchangeable Notes, stock options and contingently issuable shares	1,123,482	187,134	15,708	27,025	74,281
Total diluted weighted average shares / units outstanding	73,654,274	59,549,325	52,049,191	41,248,803	34,978,504

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Inflation

The majority of the Company's leases require tenants to pay for recoveries and escalation charges based upon the tenant's proportionate share of, and/or increases in, real estate taxes and certain operating costs, which reduce the Company's exposure to increases in operating costs resulting from inflation.

New Accounting Pronouncements

There are currently no recently issued accounting pronouncements that are expected to have a material effect on our financial condition and results of operations in future periods.

ITEM 7A.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

The primary market risk we face is interest rate risk. We mitigate this risk by following established risk management policies and procedures. These policies include maintaining prudent amounts of debt, including a greater amount of fixed-rate debt as compared to variable-rate debt in our portfolio, and may include the periodic use of derivative instruments. As of December 31, 2012 and 2011, we did not have any interest-rate sensitive derivative assets or liabilities.

Information about our changes in interest rate risk exposures from December 31, 2011 to December 31, 2012 is incorporated herein by reference from "Item 7: Management’s Discussion and Analysis of Financial Condition and Results of Operations —Liquidity and Capital Resources of the Operating Partnership.”

Market Risk

As of December 31, 2012, approximately 16.4% of our total outstanding debt of $2.0 billion was subject to variable interest rates. The remaining 83.6% bore interest at fixed rates. All of our interest rate sensitive financial instruments are held for purposes other than trading purposes.

In general, interest rate fluctuations applied to our variable-rate debt will impact our future earnings and cash flows. Conversely, interest rate fluctuations applied to our fixed-rate debt will generally not impact our future earnings and cash flows, unless such instruments mature or are otherwise terminated and need to be refinanced. However, interest rate fluctuations will impact the fair value of the fixed-rate debt instruments.

We generally determine the fair value of our secured debt, revolving credit facility, and term loan facility by performing discounted cash flow analyses using an appropriate market discount rate. We calculate the market rate by obtaining period−end treasury rates for maturities that correspond to the maturities of our fixed−rate debt and then adding an appropriate credit spread based on information obtained from third−party financial institutions. We calculate the market rate of our revolving credit facility and term loan facility by obtaining the period−end LIBOR rate and then adding an appropriate credit spread based on information obtained from third−party financial institutions. These credit spreads take into account factors, including but not limited to, our credit profile, the tenure of the debt, amortization period, whether the debt is secured or unsecured, and the loan−to−value ratio of the debt to the collateral. These calculations are significantly affected by the assumptions used, including the discount rate, credit spreads, and estimates of future cash flow. We determine the fair value of the liability component of our 4.25% Exchangeable Notes by performing discounted cash flow analyses using an appropriate market interest rate based upon spreads for our publicly traded debt. We determine the fair value of each of our publicly traded unsecured senior notes based on their quoted trading price at the end of the reporting period. See Note 16 to our consolidated financial statements included in this report for additional information on the fair value of our financial assets and liabilities as of December 31, 2012 and 2011.

As of December 31, 2012, the total outstanding balance of our variable-rate debt was comprised of borrowings on our revolving credit facility of $185.0 million and borrowings on our term loan facility of $150.0 million, which were indexed to LIBOR plus spreads of 1.450% (weighted average interest rate of 1.66%) and 1.750% (weighted average interest rate of 1.97%), respectively. As of December 31, 2011, the total outstanding balance of our variable-rate debt was comprised of borrowings of $182.0 million on our revolving credit facility, which was indexed to LIBOR plus a spread of 1.750% (weighted average interest rate of 2.05%). Assuming no changes in the outstanding balance of our existing variable-rate debt as of December 31, 2012, a 100 basis point increase in the LIBOR rate would increase our projected annual interest expense, before the effect of capitalization, by approximately $3.4 million. Comparatively, if interest rates were 100 basis points higher as of December 31, 2011, our projected annual interest expense, before the effect of capitalization, would have been $1.8 million higher.

The total carrying value of our fixed-rate debt, including our Exchangeable Notes, was approximately $1.7 billion and $1.6 billion as of December 31, 2012 and 2011, respectively. The total estimated fair value of our fixed-rate debt was approximately $1.9 billion and $1.7 billion as of December 31, 2012 and 2011, respectively. For sensitivity purposes, a 100 basis point increase in the discount rate equates to a decrease in the total fair value of our fixed-rate debt of approximately $71.8 million, or 3.8%, as

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of December 31, 2012. Comparatively, a 100 basis point increase in the discount rate equates to a decrease in the total fair value of our fixed-rate debt of approximately $64.2 million, or 3.8%, as of December 31, 2011.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA    

See the index included at Item 15: Exhibits, Financial Statement Schedules.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE    

Not applicable.

ITEM 9A. CONTROLS AND PROCEDURES    

Kilroy Realty Corporation

The Company maintains disclosure controls and procedures (as defined in Rule 13a-15(e) or Rule 15d-15(e) under the Exchange Act) that are designed to ensure that information required to be disclosed in the Company's reports under the Exchange Act is processed, recorded, summarized, and reported within the time periods specified in the SEC's rules and forms and that such information is accumulated and communicated to management, including the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow for timely decisions regarding required disclosure. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management is required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

As required by SEC Rule 13a-15(b), the Company carried out an evaluation, under the supervision and with the participation of management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of the disclosure controls and procedures as of December 31, 2012, the end of the period covered by this report. Based on the foregoing, the Company's Chief Executive Officer and Chief Financial Officer concluded, as of that time, that disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control Over Financial Reporting

There have been no significant changes that occurred during the fourth quarter of the most recent year covered by this report in the Company's internal control over financial reporting identified in connection with the evaluation referenced above that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

Management’s Report on Internal Control Over Financial Reporting

Internal control over financial reporting is a process designed by, or under the supervision of, our Chief Executive Officer and Chief Financial Officer and effected by our board of directors, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP. Internal control over financial reporting includes those policies and procedures that: (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with GAAP, and that our receipts and expenditures are being made only in accordance with authorizations of management and directors; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of assets that could have a material effect on the consolidated financial statements.

Management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control over financial reporting is supported by written policies and procedures and by an appropriate segregation of responsibilities and duties. The Company has used the criteria set forth in the Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission to assess our internal control over financial reporting. Based upon this assessment, management concluded that internal control over financial reporting operated effectively as of December 31, 2012.

Deloitte & Touche LLP, the Company's independent registered public accounting firm, has audited the Company's financial statements and has issued a report on the effectiveness of the Company's internal control over financial reporting.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

Kilroy Realty Corporation

Los Angeles, California

We have audited the internal control over financial reporting of Kilroy Realty Corporation (the “Company”) as of December 31, 2012, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. The Company's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Company's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed by, or under the supervision of, the company's principal executive and principal financial officers, or persons performing similar functions, and effected by the company's board of directors, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of the inherent limitations of internal control over financial reporting, including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2012, based on the criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated financial statements and financial statement schedules as of and for the year ended December 31, 2012, of the Company and our report dated February 11, 2013, expressed an unqualified opinion on those financial statements and financial statement schedules.

/s/    DELOITTE & TOUCHE LLP

Los Angeles, California

February 11, 2013

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Kilroy Realty, L.P.

The Operating Partnership maintains disclosure controls and procedures (as defined in Rule 13a-15(e) or Rule 15d-15(e) under the Exchange Act) that are designed to ensure that information required to be disclosed in our reports under the Exchange Act, is processed, recorded, summarized, and reported within the time periods specified in the SEC's rules and forms and that such information is accumulated and communicated to management, including the Chief Executive Officer and Chief Financial Officer of its general partner, as appropriate, to allow for timely decisions regarding required disclosure. In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and management is required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

As required by SEC Rule 13a-15(b), the Operating Partnership carried out an evaluation, under the supervision and with the participation of management including the Chief Executive Officer and Chief Financial Officer of its general partner, of the effectiveness of the design and operation of the disclosure controls and procedures as of the end of the period covered by this report. Based on the foregoing, the Chief Executive Officer and Chief Financial Officer of its general partner concluded, as of that time, that our disclosure controls and procedures were effective at the reasonable assurance level.

Changes in Internal Control Over Financial Reporting

There have been no changes that occurred during the fourth quarter of the most recent year covered by this report in the Operating Partnership's internal control over financial reporting identified in connection with the evaluation referenced above that has materially affected, or is reasonably likely to materially affect, the Operating Partnership's internal control over financial reporting.

Management's Report on Internal Control Over Financial Reporting

Internal control over financial reporting is a process designed by, or under the supervision of, the Chief Executive Officer and Chief Financial Officer of the Operating Partnership's general partner and effected by the board of directors, management, and other personnel of its general partner to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with GAAP. Internal control over financial reporting includes those policies and procedures that: (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with GAAP, and that our receipts and expenditures are being made only in accordance with authorizations of management and directors; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of assets that could have a material effect on the consolidated financial statements.

Management is responsible for establishing and maintaining adequate internal control over financial reporting. Our internal control over financial reporting is supported by written policies and procedures and by an appropriate segregation of responsibilities and duties. The Operating Partnership has used the criteria set forth in the Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission to assess our internal control over financial reporting. Based upon this assessment, management concluded that internal control over financial reporting operated effectively as of December 31, 2012.

Deloitte & Touche LLP, the Operating Partnership's independent registered public accounting firm, has audited the Operating Partnership's financial statements and has issued a report on the effectiveness of the Operating Partnership's internal control over financial reporting.

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REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

Kilroy Realty, L.P.

Los Angeles, California

We have audited the internal control over financial reporting of Kilroy Realty L.P. (the “Operating Partnership”) as of December 31, 2012, based on criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission. The Operating Partnership's management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying Management's Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the Operating Partnership's internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company's internal control over financial reporting is a process designed by, or under the supervision of, the company's principal executive and principal financial officers, or persons performing similar functions, and effected by the company's board of directors, management, and other personnel to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company's internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company's assets that could have a material effect on the financial statements.

Because of the inherent limitations of internal control over financial reporting, including the possibility of collusion or improper management override of controls, material misstatements due to error or fraud may not be prevented or detected on a timely basis. Also, projections of any evaluation of the effectiveness of the internal control over financial reporting to future periods are subject to the risk that the controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, the Operating Partnership maintained, in all material respects, effective internal control over financial reporting as of December 31, 2012, based on the criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated financial statements and financial statement schedules as of and for the year ended December 31, 2012, of the Operating Partnership and our report dated February 11, 2013, expressed an unqualified opinion on those financial statements and financial statement schedules.

/s/    DELOITTE & TOUCHE LLP

Los Angeles, California

February 11, 2013

78

ITEM 9B. OTHER INFORMATION

Not applicable.

PART III

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information required by Item 10 is incorporated by reference from our definitive proxy statement for our annual stockholders’ meeting presently scheduled to be held in May 2013.

ITEM 11. EXECUTIVE COMPENSATION

The information required by Item 11 is incorporated by reference from our definitive proxy statement for our annual stockholders’ meeting presently scheduled to be held in May 2013.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by Item 12 is incorporated by reference from our definitive proxy statement for our annual stockholders’ meeting presently scheduled to be held in May 2013.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by Item 13 is incorporated by reference from our definitive proxy statement for our annual stockholders’ meeting presently scheduled to be held in May 2013.

ITEM 14.  PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information required by Item 14 is incorporated by reference from our definitive proxy statement for our annual stockholders’ meeting presently scheduled to be held in May 2013.

79

PART IV

ITEM 15. EXHIBITS, FINANCIAL STATEMENT SCHEDULES

(a)(1) and (2) Financial Statements and Schedules

The following consolidated financial information is included as a separate section of this annual report on Form 10-K:

Report of Independent Registered Public Accounting Firm - Kilroy Realty Corporation	F - 2
Report of Independent Registered Public Accounting Firm - Kilroy Realty, L.P.	F - 8
Consolidated Balance Sheets as of December 31, 2012 and 2011 - Kilroy Realty Corporation	F - 3
Consolidated Statements of Operations for the Years ended December 31, 2012, 2011, and 2010 - Kilroy Realty Corporation	F - 4
Consolidated Statements of Equity for the Years ended December 31, 2012, 2011, and 2010 - Kilroy Realty Corporation	F - 5
Consolidated Statements of Cash Flows for the Years ended December 31, 2012, 2011, and 2010 - Kilroy Realty Corporation	F - 6
Consolidated Balance Sheets as of December 31, 2012 and 2011 - Kilroy Realty, L.P.	F - 9
Consolidated Statements of Operations for the Years ended December 31, 2012, 2011, and 2010 - Kilroy Realty, L.P.	F - 10
Consolidated Statements of Capital for the Years ended December 31, 2012, 2011, and 2010 - Kilroy Realty, L.P.	F - 11
Consolidated Statements of Cash Flows for the Years ended December 31, 2012, 2011, and 2010 - Kilroy Realty, L.P.	F - 12
Notes to Consolidated Financial Statements	F - 14
Schedule II—Valuation and Qualifying Accounts	F - 62
Schedule III—Real Estate and Accumulated Depreciation	F - 63

All other schedules are omitted because the required information is not present in amounts sufficient to require submission of the schedule or because the information required is included in the financial statements and notes thereto.

(3)  Exhibits

Exhibit Number	Description
3.(i)1	Kilroy Realty Corporation Articles of Restatement (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2012)
3.(i)2	Certificate of Limited Partnership of Kilroy Realty, L.P. (previously filed by Kilroy Realty, L.P., as an exhibit to the General Form for Registration of Securities on Form 10 as filed with the Securities and Exchange Commission on August 18, 2010)
3.(i)3	Amendment to the Certificate of Limited Partnership of Kilroy Realty, L.P. (previously filed by Kilroy Realty, L.P., as an exhibit to the General Form for Registration of Securities on Form 10 as filed with the Securities and Exchange Commission on August 18, 2010)
3.(i)4	Articles Supplementary designating Kilroy Realty Corporation's 6.375% Series H Cumulative Redeemable Preferred Stock (previously filed by Kilroy Realty Corporation on Form 8-A as filed with the Securities and Exchange Commission on August 10, 2012)
3.(ii).1	Second Amended and Restated Bylaws of Kilroy Realty Corporation (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on December 12, 2008)
3.(ii).2	Amendment No. 1 to Second Amended and Restated Bylaws of Kilroy Realty Corporation (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on May 27, 2009)
3.(ii).3	Seventh Amended and Restated Agreement of Limited Partnership of Kilroy Realty, L.P. dated as of August 15, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on August 17, 2012)

80

Exhibit Number	Description
4.1	Kilroy Realty Corporation Form of Certificate for Common Stock (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
4.2	Specimen Certificate for Kilroy Realty Corporation's 6.875% Series G Cumulative Redeemable Preferred Stock (previously filed by Kilroy Realty Corporation on Form 8-A as filed with the Securities and Exchange Commission on March 22, 2012)
4.3	Specimen Certificate for Kilroy Realty Corporation's 6.375% Series H Cumulative Redeemable Preferred Stock (previously filed by Kilroy Realty Corporation on Form 8-A as filed with the Securities and Exchange Commission on August 10, 2012)
4.4	Kilroy Realty Corporation Form of Stock Option Grant Notice and Stock Option Agreement (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on February 24, 2012)
4.5	Registration Rights Agreement dated January 31, 1997 (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
4.6	Registration Rights Agreement dated as of October 31, 1997 (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K/A as filed with the Securities and Exchange Commission on December 19, 1997)
4.7	Registration Rights Agreement dated as of October 6, 2000 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2000)
4.8	The Company is party to agreements in connection with long-term debt obligations, none of which individually exceeds ten percent of the total assets of the Company on a consolidated basis. Pursuant to Item 601(b)(4)(iii)(A) of Regulation S-K, the Company agrees to furnish copies of these agreements to the Commission upon request
4.9	Registration Rights Agreement dated as of July 31, 2012 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2012)
4.10	Note and Guarantee Agreement dated August 4, 2004 by and between Kilroy Realty, L.P. and Kilroy Realty Corporation and the purchasers whose names appear in the acceptance form at the end of the Note and Guarantee Agreement (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on August 11, 2004)
4.11	Form of 6.45% Series B Guaranteed Senior Note due 2014 (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on August 11, 2004)
4.12†	Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-8 filed with the Securities and Exchange Commission on June 28, 2006)
4.13†	Amendment to Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2006)
4.14†	Second Amendment to Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended March 31, 2007)
4.15†	Third Amendment to Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on May 27, 2009)
4.16†	Fourth Amendment to Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S−8 as filed with the Securities and Exchange Commission on June 11, 2010)
4.17	Form of Restricted Stock Award Agreement (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on February 8, 2007)
4.18	Indenture, dated as of November 20, 2009, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee, including the form of 4.25% Exchangeable Senior Notes due 2014 and the form of related guarantee (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
4.19	Registration Rights Agreement, dated November 20, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation, J.P. Morgan Securities Inc., and Merrill Lynch, Pierce, Fenner & Smith Incorporated (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
4.20	Form of Certificate for Partnership Units of Kilroy Realty, L.P. (previously filed by Kilroy Realty, L.P., as an exhibit to the General Form for Registration of Securities on Form 10 as filed with the Securities and Exchange Commission on August 18, 2010)

81

Exhibit Number	Description
4.21	Indenture, dated May 24, 2010, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee, including the form of 6.625% Senior Notes due 2020 and the form of the related guarantee (previously filed by Kilroy Realty Corporation as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on May 25, 2010)
4.22	Registration Rights Agreement, dated May 24, 2010, among Kilroy Realty, L.P., Kilroy Realty Corporation, J.P. Morgan Securities Inc., Banc of America Securities LLC and Barclays Capital Inc. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on May 25, 2010)
4.23	Indenture, dated November 3, 2010, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee, including the form of 5.000% Senior Notes due 2015 and the form of related guarantee (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P., as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on November 4, 2010)
4.24	Indenture, dated March 1, 2011, by and among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee(previously filed by Kilroy Corporation and Kilroy Realty, L.P. as an exhibit the Registration Statement on Form S-3 as filed with the Securities and Exchange Commission on March 1, 2011)
4.25	Supplemental Indenture, dated July 5, 2011, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee (previously filed by Kilroy Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 6, 2011)
4.26	Officers' Certificate pursuant to Sections 101, 201, 301 and 303 of the Indenture dated March 1, 2011, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee, establishing a series of securities entitled “4.800% Notes due 2018,” including the form of 4.800% Notes due 2018 and the form of related guarantee (previously filed by Kilroy Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 6, 2011)
4.27	Registration Rights Agreement dated as of July 31, 2012 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2012)
10.1	Pledge Agreement by and among Kilroy Realty, L.P., John B. Kilroy, Sr., John B. Kilroy, Jr. and Kilroy Industries (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
10.2†	1997 Stock Option and Incentive Plan of the Registrant and Kilroy Realty, L.P. (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
10.3	Lease Agreement dated January 24, 1989 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase I (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 2 to Form S-11 (No. 333-15553))
10.4	First Amendment to Lease Agreement dated December 28, 1990 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase I (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 2 to Form S-11 (No. 333-15553))
10.5	Lease Agreement dated July 17, 1985 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase III (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.6	Lease Agreement dated December 30, 1988 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase II (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.7	First Amendment to Lease dated January 24, 1989 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase III (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.8	Second Amendment to Lease Agreement dated December 28, 1990 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase III (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.9	First Amendment to Lease Agreement dated December 28, 1990 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase II (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))

82

Exhibit Number	Description
10.10	Third Amendment to Lease Agreement dated October 10, 1994 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase III (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.11	Development Agreement by and between Kilroy Long Beach Associates and the City of Long Beach (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.12	Amendment No. 1 to Development Agreement by and between Kilroy Long Beach Associates and the City of Long Beach (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.13†	Noncompetition Agreement by and between the Registrant and John B. Kilroy, Sr. (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
10.14†	Noncompetition Agreement by and between the Registrant and John B. Kilroy, Jr. (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
10.15	License Agreement by and among the Registrant and the other persons named therein (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 4 to Form S-11 (No. 333-15553))
10.16	Contribution Agreement dated October 21, 1997 by and between Kilroy Realty, L.P. and Kilroy Realty Corporation and The Allen Group and the Allens (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 21, 1997)
10.17	Amendment to the Contribution Agreement dated October 14, 1998 by and between Kilroy Realty, L.P. and Kilroy Realty Corporation and The Allen Group and the Allens dated October 21, 1997 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended September 30, 1998)
10.18†	Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Jeffrey C. Hawken effective as of January 1, 2007 (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on March 22, 2007)
10.19†	Amendment No. 1 to Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Jeffrey C. Hawken effective as of December 31, 2009 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2008)
10.20	Amendment to letter confirmation dated April 4, 2007, among Kilroy Realty, L.P., Kilroy Realty Corporation and JPMorgan Chase Bank, National Association, London Branch (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on April 11, 2007)
10.21	Amendment to letter confirmation dated April 4, 2007, among Kilroy Realty, L.P., Kilroy Realty Corporation and Bank of America, N.A. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on April 11, 2007)
10.22†	Kilroy Realty Corporation 2007 Deferred Compensation Plan (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2007)
10.23†	Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Tyler H. Rose effective as of January 1, 2007 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2007)
10.24†	Amendment No. 1 to Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Tyler H. Rose effective as of December 31, 2009 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2008)
10.25†	Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Heidi Roth effective as of January 1, 2007 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2007)
10.26†	Amendment No. 1 to Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Heidi Roth effective as of December 31, 2009 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2008)
10.27†	Kilroy Realty Corporation Stock Award Deferral Program (previously filed by Kilroy Realty Corporation as an exhibit to Form 8-K as filed with the Securities and Exchange Commission on January 2, 2008)
10.28	Letter confirmation dated November 16, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation and JPMorgan Chase Bank, National Association, London Branch (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)

83

Exhibit Number	Description
10.29	Letter confirmation dated November 16, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation and Bank of America, N.A. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
10.30	Letter confirmation dated November 20, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation and JPMorgan Chase Bank, National Association, London Branch (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
10.31	Letter confirmation dated November 20, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation and Bank of America, N.A. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
10.32†	Form of Indemnification Agreement of Kilroy Realty Corporation with certain officers and directors (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2009)
10.33†	Separation Agreement and Release dated December 16, 2009 by and between Richard E. Moran Jr., Kilroy Realty, L.P. and Kilroy Realty Corporation (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2009)
10.34	Deed of Trust and Security Agreement dated January 26, 2010 between Kilroy Realty, L.P. and The Northwestern Mutual Life Insurance Company; related Promissory Note dated January 26, 2010 for $71 million payable to The Northwestern Mutual Life Insurance Company; and related Guarantee of Recourse Obligations dated January 26, 2010 by Kilroy Realty Corporation (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2009)
10.35	Agreement of Purchase and Sale and Joint Escrow Instructions dated April 12, 2010 by and between Kilroy Realty, L.P, a Delaware limited partnership, and MEPT 303 Second Street LLC, a Delaware limited liability company (previously filed by Kilroy Realty Corporation as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on May 27, 2010)
10.36	First Amendment to Agreement of Purchase and Sale and Joint Escrow Instructions dated May 21, 2010 by and between Kilroy Realty, L.P, a Delaware limited partnership, and MEPT 303 Second Street LLC, a Delaware limited liability company (previously filed by Kilroy Realty Corporation as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on May 27, 2010)
10.37	Promissory Note dated January 12, 2011, executed by Kilroy Realty 303, LLC (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on January 13, 2011)
10.38	Deed of Trust, Security Agreement and Fixture Filing dated January 12, 2011, executed by Kilroy Realty 303, LLC (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on January 13, 2011)
10.39	Guaranty dated January 12, 2011, executed by Kilroy Realty, L.P. (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on January 13, 2011)
10.40	Unsecured Indemnity Agreement dated January 12, 2011, executed by Kilroy Realty 303, LLC (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P. as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on January 13, 2011)
10.41	Sales Agreement, dated July 25, 2011, between Kilroy Realty Corporation, Kilroy Realty, LP. and Barclays Capital Inc. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 28, 2011)
10.42	Sales Agreement, dated July 25, 2011, between Kilroy Realty Corporation, Kilroy Realty, LP. and Wells Fargo Securities, LLC (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 28, 2011)
10.43	Sales Agreement, dated July 25, 2011, between Kilroy Realty Corporation, Kilroy Realty, LP. and Merrill Lynch, Pierce, Fenner & Smith Incorporated (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 28, 2011)
10.44	Sales Agreement, dated July 25, 2011, between Kilroy Realty Corporation, Kilroy Realty, LP. and J.P. Morgan Securities LLC (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 28, 2011)
10.45†	Amended and Restated Employment Agreement by and between Kilroy Realty Corporation, Kilroy Realty, L.P. and John B. Kilroy, Jr. (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on April 4, 2012)

84

Exhibit Number	Description
10.46†	Noncompetition Agreement by and between Kilroy Realty Corporation, Kilroy Realty, L.P. and John B. Kilroy, Jr. (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on April 4, 2012)
10.47	Term Loan Agreement dated March 29, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on April 2, 2012)
10.48*	First Amendment to Term Loan Agreement dated November 28, 2012
10.49	Guaranty of Payment of Kilroy Realty Corporation dated March 29, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on April 2, 2012)
10.50	Promissory Note, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.51	Loan Agreement dated June 28, 2012, by and between KR MML 12701, LLC and Massachusetts Mutual Life Insurance Company (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.52	Deed of Trust, Assignment of Leases and Rents, Security Agreement and Fixture Filing (Irvine) for 2211 Michelson Drive, Irvine, California, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.53	Deed of Trust, Assignment of Leases and Rents, Security Agreement and Fixture Filing (Santa Monica) for 2100-2110 Colorado Avenue, Santa Monica, California, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.54	Recourse Guaranty Agreement, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.55	Environmental Indemnification Agreement, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.56*	Amended and Restated Revolving Credit Agreement dated November 28, 2012
10.57*	Amended and Restated Guaranty of Payment dated November 28, 2012
12.1*	Statement of Computation of Consolidated Ratio of Earnings to Fixed Charges and Consolidated Ratio of Earnings to Combined Fixed Charges and Preferred Dividends of Kilroy Realty Corporation
12.2*	Statement of Computation of Consolidated Ratio of Earnings to Fixed Charges of Kilroy Realty, L.P.
21.1*	List of Subsidiaries of Kilroy Realty Corporation
21.2*	List of Subsidiaries of Kilroy Realty, L.P.
23.1*	Consent of Deloitte & Touche LLP for Kilroy Realty Corporation
23.2*	Consent of Deloitte & Touche LLP for Kilroy Realty, L.P.
24.1*	Power of Attorney (included on the signature page of this Form 10-K)
31.1*	Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer of Kilroy Realty Corporation
31.2*	Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer of Kilroy Realty Corporation
31.3*	Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer of Kilroy Realty, L.P.
31.4*	Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer of Kilroy Realty, L.P.
32.1*	Section 1350 Certification of Chief Executive Officer of Kilroy Realty Corporation
32.2*	Section 1350 Certification of Chief Financial Officer of Kilroy Realty Corporation
32.3*	Section 1350 Certification of Chief Executive Officer of Kilroy Realty, L.P.
32.4*	Section 1350 Certification of Chief Financial Officer of Kilroy Realty, L.P.
101.1	The following Kilroy Realty Corporation and Kilroy Realty, L.P. financial information for the year ended December 31, 2012, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income, (iii) Consolidated Statements of Changes in Equity, (iv) Consolidated Statements of Capital, (v) Consolidated Statements of Cash Flows and (vi) Notes to the Consolidated Financial Statements. (1)

*	Filed herewith
†	Management contract or compensatory plan or arrangement.

85

(1) Pursuant to Rule 406T of Regulation S−T, these interactive data files are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933 or Section 18 of the Securities Exchange Act of 1934 and otherwise are not subject to liability under these sections.

86

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, Kilroy Realty Corporation has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on February 11, 2013.

KILROY REALTY CORPORATION
By	/s/ Heidi R. Roth
	Heidi R. Roth Senior Vice President, Chief Accounting Officer and Controller

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that we, the undersigned officers and directors of Kilroy Realty Corporation, hereby severally constitute John B. Kilroy, Sr., John B. Kilroy, Jr., Jeffrey C. Hawken, Tyler H. Rose and Heidi R. Roth, and each of them singly, our true and lawful attorneys with full power to them, and each of them singly, to sign for us and in our names in the capacities indicated below, the Form 10-K filed herewith and any and all amendments to said Form 10-K, and generally to do all such things in our names and in our capacities as officers and directors to enable Kilroy Realty Corporation to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission, hereby ratifying and confirming our signatures as they may be signed by our said attorneys, or any of them, to said Form 10-K and any and all amendments thereto.

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Name	Title	Date
/s/ John B. Kilroy, Sr.	Chairman of the Board	February 11, 2013
John B. Kilroy, Sr.
/s/ John B. Kilroy, Jr.	President, Chief Executive Officer and Director (Principal Executive Officer)	February 11, 2013
John B. Kilroy, Jr.
/s/ Tyler H. Rose	Executive Vice President and Chief Financial Officer (Principal Financial Officer)	February 11, 2013
Tyler H. Rose
/s/ Heidi R. Roth	Senior Vice President, Chief Accounting Officer and Controller (Principal Accounting Officer)	February 11, 2013
Heidi R. Roth
/s/ Edward. F. Brennan, Ph.D.	Director	February 11, 2013
Edward F. Brennan, Ph.D.
/s/ William P. Dickey	Director	February 11, 2013
William P. Dickey
/s/ Scott S. Ingraham	Director	February 11, 2013
Scott S. Ingraham
/s/ Dale F. Kinsella	Director	February 11, 2013
Dale F. Kinsella

87

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, Kilroy Realty, L.P. has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on February 11, 2013.

KILROY REALTY, L.P.
By	/s/ Heidi R. Roth
	Heidi R. Roth Senior Vice President, Chief Accounting Officer and Controller

POWER OF ATTORNEY

KNOW ALL MEN BY THESE PRESENTS, that we, the undersigned officers and directors of Kilroy Realty Corporation, as sole general partner and on behalf of Kilroy Realty, L.P., hereby severally constitute John B. Kilroy, Sr., John B. Kilroy, Jr., Jeffrey C. Hawken, Tyler H. Rose and Heidi R. Roth, and each of them singly, our true and lawful attorneys with full power to them, and each of them singly, to sign for us and in our names in the capacities indicated below, the Form 10-K filed herewith and any and all amendments to said Form 10-K, and generally to do all such things in our names and in our capacities as officers and directors to enable Kilroy Realty Corporation, as sole general partner and on behalf of Kilroy Realty, L.P., to comply with the provisions of the Securities Exchange Act of 1934, as amended, and all requirements of the Securities and Exchange Commission, hereby ratifying and confirming our signatures as they may be signed by our said attorneys, or any of them, to said Form 10-K and any and all amendments thereto.

Pursuant to the requirements of the Securities Exchange Act of 1934, as amended, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

Name	Title	Date
/s/ John B. Kilroy, Sr.	Chairman of the Board	February 11, 2013
John B. Kilroy, Sr.
/s/ John B. Kilroy, Jr.	President, Chief Executive Officer and Director (Principal Executive Officer)	February 11, 2013
John B. Kilroy, Jr.
/s/ Tyler H. Rose	Executive Vice President and Chief Financial Officer (Principal Financial Officer)	February 11, 2013
Tyler H. Rose
/s/ Heidi R. Roth	Senior Vice President, Chief Accounting Officer and Controller (Principal Accounting Officer)	February 11, 2013
Heidi R. Roth
/s/ Edward F. Brennan, Ph.D.	Director	February 11, 2013
Edward F. Brennan, Ph.D.
/s/ William P. Dickey	Director	February 11, 2013
William P. Dickey
/s/ Scott S. Ingraham	Director	February 11, 2013
Scott S. Ingraham
/s/ Dale F. Kinsella	Director	February 11, 2013
Dale F. Kinsella

88

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

CONSOLIDATED FINANCIAL STATEMENTS AS OF DECEMBER 31, 2012 AND 2011

AND FOR THE THREE YEARS ENDED DECEMBER 31, 2012

TABLE OF CONTENTS

	Page
FINANCIAL STATEMENTS OF KILROY REALTY CORPORATION:
Report of Independent Registered Public Accounting Firm	F - 2
Consolidated Balance Sheets as of December 31, 2012 and 2011	F - 3
Consolidated Statements of Operations for the Years ended December 31, 2012, 2011, and 2010	F - 4
Consolidated Statements of Equity for the Years ended December 31, 2012, 2011, and 2010	F - 5
Consolidated Statements of Cash Flows for the Years ended December 31, 2012, 2011, and 2010	F - 6
FINANCIAL STATEMENTS OF KILROY REALTY, L.P.:
Report of Independent Registered Public Accounting Firm	F - 8
Consolidated Balance Sheets as of December 31, 2012 and 2011	F - 9
Consolidated Statements of Operations for the Years ended December 31, 2012, 2011, and 2010	F - 10
Consolidated Statements of Capital for the Years ended December 31, 2012, 2011, and 2010	F - 11
Consolidated Statements of Cash Flows for the Years ended December 31, 2012, 2011, and 2010	F - 12
Notes to Consolidated Financial Statements for Kilroy Realty Corporation and Kilroy Realty, L.P.	F - 14
Schedule II—Valuation and Qualifying Accounts for Kilroy Realty Corporation and Kilroy Realty, L.P.	F - 62
Schedule III—Real Estate and Accumulated Depreciation for Kilroy Realty Corporation and Kilroy Realty, L.P.	F - 63

F - 1

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Board of Directors and Stockholders of

Kilroy Realty Corporation

Los Angeles, California

We have audited the accompanying consolidated balance sheets of Kilroy Realty Corporation (the “Company”) as of December 31, 2012 and 2011, and the related consolidated statements of operations, equity, and cash flows for each of the three years in the period ended December 31, 2012. Our audits also included the financial statement schedules listed in the Index at Item 15. These financial statements and financial statement schedules are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements and financial statement schedules based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2012 and 2011, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2012, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, such financial statement schedules, when considered in relation to the basic consolidated financial statements taken as a whole, present fairly, in all material respects, the information set forth therein.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Company’s internal control over financial reporting as of December 31, 2012, based on the criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 11, 2013, expressed an unqualified opinion on the Company’s internal control over financial reporting.

/s/ DELOITTE & TOUCHE LLP

Los Angeles, California

February 11, 2013

F - 2

KILROY REALTY CORPORATION

CONSOLIDATED BALANCE SHEETS

(in thousands, except share data)

	December 31,
	2012			2011
ASSETS
REAL ESTATE ASSETS (Notes 3,17 and 18):
Land and improvements	$	612,714		$	537,574
Buildings and improvements	3,335,026			2,830,310
Undeveloped land and construction in progress	809,654			430,806
Total real estate held for investment	4,757,394			3,798,690
Accumulated depreciation and amortization	(756,515		)	(742,503		)
Total real estate held for investment, net ($319,770 and $101,352 of VIE, Note 2)	4,000,879			3,056,187
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 17)	—			84,156
CASH AND CASH EQUIVALENTS	16,700			4,777
RESTRICTED CASH (Note 17)	247,544			358
MARKETABLE SECURITIES (Notes 13 and 16)	7,435			5,691
CURRENT RECEIVABLES, NET (Note 5)	9,220			8,395
DEFERRED RENT RECEIVABLES, NET (Note 5)	115,418			101,142
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLES ASSETS, NET (Notes 3 and 4)	189,968			155,522
DEFERRED FINANCING COSTS, NET (Notes 2 and 7)	18,971			18,368
PREPAID EXPENSES AND OTHER ASSETS, NET	9,949			12,199
TOTAL ASSETS	$	4,616,084		$	3,446,795
LIABILITIES, NONCONTROLLING INTEREST AND EQUITY
LIABILITIES:
Secured debt (Notes 3, 6, 7 and 16)	$	561,096		$	351,825
Exchangeable senior notes, net (Notes 6, 7 and 16)	163,944			306,892
Unsecured debt, net (Notes 6, 7 and 16)	1,130,895			980,569
Unsecured line of credit (Notes 6, 7 and 16)	185,000			182,000
Accounts payable, accrued expenses and other liabilities (Note 15)	154,734			81,713
Accrued distributions (Note 10)	28,924			22,692
Deferred revenue and acquisition-related intangible liabilities, net (Notes 3, 4 and 8)	117,904			79,781
Rents received in advance and tenant security deposits	37,654			26,917
Liabilities and deferred revenue of real estate assets held for sale (Note 17)	—			13,286
Total liabilities	2,380,151			2,045,675
COMMITMENTS AND CONTINGENCIES (Note 15)
NONCONTROLLING INTEREST (Note 9):
7.45% Series A Cumulative Redeemable Preferred units of the Operating Partnership	—			73,638
EQUITY (Notes 9 and 10):
Stockholders’ Equity:
Preferred Stock, $.01 par value, 30,000,000 shares authorized,
7.45% Series A Cumulative Redeemable Preferred stock, $.01 par value, no authorized shares    at 12/31/2012 and 1,500,000 shares authorized, none issued and outstanding at 12/31/2011	—			—
7.80% Series E Cumulative Redeemable Preferred stock, $.01 par value, no authorized shares      at 12/31/2012 and 1,610,000 shares authorized, issued and outstanding ($40,250 liquidation      preference) at 12/31/2011	—			38,425
7.50% Series F Cumulative Redeemable Preferred stock, $.01 par value, no authorized shares      at 12/31/2012 and 3,450,000 shares authorized, issued and outstanding ($86,250 liquidation      preference) at 12/31/2011	—			83,157
6.875% Series G Cumulative Redeemable Preferred stock, $.01 par value, 4,600,000 shares      authorized, 4,000,000 shares issued and outstanding ($100,000 liquidation preference) at      12/31/2012 and no authorized shares at 12/31/2011	96,155			—
6.375% Series H Cumulative Redeemable Preferred stock, $.01 par value,      4,000,000 shares authorized, issued and outstanding ($100,000 liquidation preference) at      12/31/2012 and no authorized shares at 12/31/2011	96,256			—
Common stock, $.01 par value, 150,000,000 shares authorized,     74,926,981 and 58,819,717 shares issued and outstanding, respectively	749			588
Additional paid-in capital	2,126,005			1,448,997
Distributions in excess of earnings	(129,535		)	(277,450		)
Total stockholders’ equity	2,189,630			1,293,717
Noncontrolling Interest:
Common units of the Operating Partnership	46,303			33,765
Total equity	2,235,933			1,327,482
TOTAL LIABILITIES, NONCONTROLLING INTEREST AND EQUITY	$	4,616,084		$	3,446,795

See accompanying notes to consolidated financial statements

F - 3

KILROY REALTY CORPORATION

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except share and per share data)

	Year Ended December 31,
	2012			2011			2010
REVENUES:
Rental income	$	369,516		$	307,118		$	235,304
Tenant reimbursements	32,309			23,977			17,996
Other property income	3,087			6,534			1,694
Total revenues	404,912			337,629			254,994
EXPENSES:
Property expenses	79,357			66,821			51,169
Real estate taxes	34,479			29,633			23,474
Provision for bad debts	153			781			65
Ground leases (Note 4 and 15)	3,168			1,779			984
General and administrative expenses	36,188			28,148			27,963
Acquisition-related expenses	4,937			4,053			2,248
Depreciation and amortization (Notes 2 and 4)	162,917			124,928			90,836
Total expenses	321,199			256,143			196,739
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (Note 16)	848			571			964
Interest expense (Note 7)	(79,114		)	(85,785		)	(55,082		)
Loss on early extinguishment of debt (Note 7)	—			—			(4,564		)
Total other (expenses) income	(78,266		)	(85,214		)	(58,682		)
INCOME (LOSS) FROM CONTINUING OPERATIONS	5,447			(3,728		)	(427		)
DISCONTINUED OPERATIONS (Note 17)
Income from discontinued operations	12,409			19,630			19,364
Net gain on dispositions of discontinued operations	259,245			51,587			949
Total income from discontinued operations	271,654			71,217			20,313
NET INCOME	277,101			67,489			19,886
Net income attributable to noncontrolling common units of the Operating Partnership	(6,187		)	(1,474		)	(178		)
NET INCOME ATTRIBUTABLE TO KILROY REALTY CORPORATION	270,914			66,015			19,708
PREFERRED DISTRIBUTIONS AND DIVIDENDS:
Distributions to noncontrolling cumulative redeemable preferred units of the Operating Partnership (Note 9)	(3,541		)	(5,588		)	(5,588		)
Preferred dividends (Note 10)	(10,567		)	(9,608		)	(9,608		)
Original issuance costs of redeemed preferred stock and preferred units (Notes 9 and 11)	(6,980		)	—			—
Total preferred distributions and dividends	(21,088		)	(15,196		)	(15,196		)
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$	249,826		$	50,819		$	4,512
Loss from continuing operations available to common stockholders per common share—basic (Note 19)	$	(0.24	)	$	(0.35	)	$	(0.33	)
Loss from continuing operations available to common stockholders per common share—diluted (Note 19)	$	(0.24	)	$	(0.35	)	$	(0.33	)
Net income available to common stockholders per share—basic (Note 19)	$	3.56		$	0.87		$	0.07
Net income available to common stockholders per share—diluted (Note 19)	$	3.56		$	0.87		$	0.07
Weighted average shares of common stock outstanding—basic (Note 19)	69,639,623			56,717,121			49,497,487
Weighted average shares of common stock outstanding—diluted (Note 19)	69,639,623			56,717,121			49,497,487
Dividends declared per common share	$	1.40		$	1.40		$	1.40

See accompanying notes to consolidated financial statements.

F - 4

KILROY REALTY CORPORATION

CONSOLIDATED STATEMENTS OF EQUITY

(in thousands, except share and per share/unit data)

	Preferred Stock			Common Stock										Total Stock- holders’ Equity			Noncontrolling  Interest – Common Units of the Operating Partnership			Total Equity
				Number of Shares		Common Stock		Additional Paid-in Capital			Distributions in Excess of Earnings
BALANCE AT DECEMBER 31, 2009	$	121,582		43,148.762		$	431	$	913,657		$	(180,722	)	$	854,948		$	28,890		$	883,838
Net income											19,708			19,708			178			19,886
Issuance of common stock (Note 10)				9,200,000		92		299,755						299,847						299,847
Issuance of share-based compensation awards (Note 12)				3.239				2,151						2,151						2,151
Noncash amortization of share-based compensation								6,687						6,687						6,687
Repurchase of common stock and restricted stock units				(59.782	)			(2,121		)				(2,121		)				(2,121		)
Settlement of restricted stock units for shares of common stock ( Note 12)				53,451				(1,296		)				(1,296		)				(1,296		)
Exercise of stock options				4,000				83						83						83
Allocation to the equity component of cash paid upon repurchase of 3.25% Exchangeable Notes (Note 7)								(2,694		)				(2,694		)				(2,694		)
Adjustment for noncontrolling interest (Note 2)								(4,724		)				(4,724		)	4,724			—
Preferred dividends and distributions											(15,196		)	(15,196		)				(15,196		)
Dividends declared per common share and common unit ($1.40 per share/unit)											(71,042		)	(71,042		)	(2,413		)	(73,455		)
BALANCE AT DECEMBER 31, 2010	121,582			52,349,670		523		1,211,498			(247,252		)	1,086,351			31,379			1,117,730
Net income											66,015			66,015			1,474			67,489
Issuance of common stock (Note 10)				6,392,805		64		233,248						233,312						233,312
Issuance of share-based compensation awards (Note 12)				68,727		1		2,738						2,739						2,739
Noncash amortization of share-based compensation								5,588						5,588						5,588
Repurchase of common stock and restricted stock units				(11,485	)			(1,152		)				(1,152		)				(1,152		)
Exercise of stock options				15,000				395						395						395
Exchange of common units of the Operating Partnership (Note 10)				5,000				91						91			(91		)	—
Adjustment for noncontrolling interest (Note 2)								(3,409		)				(3,409		)	3,409			—
Preferred dividends and distributions											(15,196		)	(15,196		)				(15,196		)
Dividends declared per common share and common unit ($1.40 per share/unit)											(81,017		)	(81,017		)	(2,406		)	(83,423		)
BALANCE AS OF DECEMBER 31, 2011	121,582			58,819.717		588		1,448,997			(277,450		)	1,293,717			33,765			1,327,482
Net income											270,914			270,914			6,187			277,101
Issuance of Series G Preferred stock and Series H Preferred Stock (Note 10)	192,411													192,411						192,411
Redemption of Series E and Series F Preferred stock (Note 10)	(121,582		)								(4,918		)	(126,500		)				(126,500		)
Redemption of Series A Preferred units (Note 9)											(2,062		)	(2,062		)				(2,062		)
Issuance of common stock (Note 10)				16,024,618		161		671,941						672,102						672,102
Issuance of share-based compensation awards (Note 12)				62,137		—		1,291						1,291						1,291
Noncash amortization of share-based compensation (Note 12)								8,537						8,537						8,537
Repurchase of common stock and restricted stock units (Note 12)				(22,312	)			(877		)				(877		)				(877		)
Settlement of restricted stock units for shares of common stock ( Note 12)				27,821				(784		)				(784		)				(784		)
Exercise of stock options				5,000				129						129						129
Issuance of common units in connection with an operating property acquisition (Note 11)																	5,604			5,604
Exchange of common units of the Operating Partnership (Note 10)				10,000				231						231			(231		)	—
Adjustment for noncontrolling interest (Note 2)								(3,460		)				(3,460		)	3,460			—
Preferred dividends and distributions											(14,108		)	(14,108		)				(14,108		)
Dividends declared per common share and common unit ($1.40 per share/unit)											(101,911		)	(101,911		)	(2,482		)	(104,393		)
BALANCE AS OF DECEMBER 31, 2012	$	192,411		74,926,981		$	749	$	2,126,005		$	(129,535	)	$	2,189,630		$	46,303		$	2,235,933

See accompanying notes to consolidated financial statements.

F - 5

ating KILROY REALTY CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended December 31,
	2012			2011			2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	277,101		$	67,489		$	19,886
Adjustments to reconcile net income to net cash provided by operating activities (including discontinued operations):
Depreciation and amortization of building and improvements and leasing costs	168,687			135,467			102,898
(Decrease) increase in provision for bad debts	(42		)	644			(1,063		)
Depreciation of furniture, fixtures and equipment	1,213			1,130			911
Noncash amortization of share-based compensation awards (Note 12)	7,670			4,482			6,031
Noncash amortization of deferred financing costs and net debt discounts	8,433			13,540			12,490
Noncash amortization of net (below)/above market rents (Note 4)	(6,699		)	1,056			1,377
Net gain on dispositions of discontinued operations (Note 17)	(259,245		)	(51,587		)	(949		)
Noncash amortization of deferred revenue related to tenant-funded tenant improvements (Note 8)	(9,136		)	(9,349		)	(9,689		)
Straight-line rents	(21,530		)	(21,331		)	(13,616		)
Loss on early extinguishment of debt (Note 7)	—			—			4,564
Net change in other operating assets	(1,297		)	(5,434		)	(9,065		)
Net change in other operating liabilities	17,320			2,779			5,509
Insurance proceeds received for property damage and other, net	(1,751		)	(630		)	543
Net cash provided by operating activities	180,724			138,256			119,827
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisitions of operating properties, net of cash acquired (Note 3)	(454,841		)	(603,301		)	(637,620		)
Expenditures for acquisitions of development and redevelopment properties (Note 3)	(333,942		)	—			—
Expenditures for operating properties	(86,377		)	(62,739		)	(71,099		)
Expenditures for development and redevelopment properties and undeveloped land	(83,310		)	(28,517		)	(21,832		)
Net proceeds received from dispositions of operating properties (Note 17)	263,572			64,171			14,978
Insurance proceeds received for property damage	1,751			—			—
Decrease (increase) in acquisition-related deposits	5,000			(5,000		)	—
(Increase) decrease in restricted cash (Note 3)	(18,359		)	1,103			3,120
Receipt of principal payments on note receivable	—			—			10,679
Net cash used in investing activities	(706,506		)	(634,283		)	(701,774		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of Series G and Series H preferred stock (Note 10)	192,411			—			—
Redemption of Series E and Series F preferred stock (Note 10)	(126,500		)	—			—
Redemption of Series A preferred units (Note 9)	(75,000		)	—			—
Net proceeds from issuance of common stock (Note 10)	672,102			233,312			299,847
Borrowings on unsecured line of credit	704,000			550,000			660,000
Repayments on unsecured line of credit	(701,000		)	(527,000		)	(598,000		)
Proceeds from the issuance of secured debt (Note 7)	97,000			135,000			71,000
Principal payments on secured debt	(106,262		)	(127,665		)	(103,247		)
Proceeds from the issuance of unsecured debt (Note 7)	150,000			324,476			572,672
Repayments of unsecured debt	—			—			(61,000		)
Repurchase of exchangeable senior notes (Note 7)	—			—			(151,097		)
Repayments of exchangeable senior notes (Note 7)	(148,000		)	—			—
Financing costs	(7,963		)	(9,060		)	(14,912		)
Decrease (increase) in loan deposits and other	—			2,859			(605		)
Repurchase of common stock and restricted stock units	(1,661		)	(1,152		)	(3,417		)
Proceeds from exercise of stock options	129			395			83
Dividends and distributions paid to common stockholders and common unitholders	(97,386		)	(80,005		)	(69,224		)
Dividends and distributions paid to preferred stockholders and preferred unitholders	(14,165		)	(15,196		)	(15,196		)
Net cash provided by financing activities	537,705			485,964			586,904
Net increase (decrease) in cash and cash equivalents	11,923			(10,063		)	4,957
Cash and cash equivalents, beginning of year	4,777			14,840			9,883
Cash and cash equivalents, end of year	$	16,700		$	4,777		$	14,840

F - 6

KILROY REALTY CORPORATION

CONSOLIDATED STATEMENTS OF CASH FLOWS—(Continued)

(in thousands)

	Year Ended December 31,
	2012		2011		2010
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $17,657, $7,615, and $7,697 as of December 31, 2012, 2011 and 2010, respectively	$	71,633	$	68,280	$	45,986
NONCASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	$	54,198	$	14,301	$	19,563
Tenant improvements funded directly by tenants	$	17,719	$	3,288	$	4,758
Assumption of secured debt in connection with property acquisitions (Notes 3 and 7)	$	221,032	$	30,042	$	51,079
Assumption of other assets and liabilities in connection with operating and development property acquisitions, net (Note 3)	$	37,535	$	4,515	$	10,840
NONCASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders (Note 10)	$	26,863	$	21,188	$	18,925
Accrual of dividends and distributions payable to preferred stockholders and preferred unitholders (Note 10)	$	1,694	$	1,909	$	1,909
Issuance of share-based compensation awards, net (Note 12)	$	31,396	$	7,797	$	5,910
Issuance of common units in the Operating Partnership in connection with an operating property acquisition (Note 3)	$	5,604	$	—	$	—
Exchange of common units of the Operating Partnership into shares of the Company’s common stock (Note 10)	$	231	$	91	$	—

F - 7

REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

To the Partners of Kilroy Realty, L.P.

Kilroy Realty, L.P.

Los Angeles, California

We have audited the accompanying consolidated balance sheets of Kilroy Realty, L.P. (the “Operating Partnership”) as of December 31, 2012 and 2011, and the related consolidated statements of operations, capital, and cash flows for each of the three years in the period ended December 31, 2012. Our audits also included the financial statement schedules listed in the Index at Item 15. These financial statements and financial statement schedules are the responsibility of the Operating Partnership's management. Our responsibility is to express an opinion on these financial statements and financial statement schedules based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, such consolidated financial statements present fairly, in all material respects, the financial position of the Operating Partnership as of December 31, 2012 and 2011, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2012, in conformity with accounting principles generally accepted in the United States of America. Also, in our opinion, such financial statement schedules, when considered in relation to the basic consolidated financial statements taken as a whole, present fairly, in all material respects, the information set forth therein.

We have also audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the Operating Partnership's internal control over financial reporting as of December 31, 2012, based on the criteria established in Internal Control-Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 11, 2013, expressed an unqualified opinion on the Operating Partnership's internal control over financial reporting.

/s/ DELOITTE & TOUCHE LLP

Los Angeles, California

February 11, 2013

F - 8

KILROY REALTY, L.P.

CONSOLIDATED BALANCE SHEETS

(in thousands, except unit data)

	December 31,
	2012			2011
ASSETS
REAL ESTATE ASSETS (Notes 3, 17 and 18):
Land and improvements	$	612,714		$	537,574
Buildings and improvements	3,335,026			2,830,310
Undeveloped land and construction in progress	809,654			430,806
Total real estate held for investment	4,757,394			3,798,690
Accumulated depreciation and amortization	(756,515		)	(742,503		)
Total real estate held for investment, net ($319,770 and $101,352 of VIE, Note 2)	4,000,879			3,056,187
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 17)	—			84,156
CASH AND CASH EQUIVALENTS	16,700			4,777
RESTRICTED CASH (Note 17)	247,544			358
MARKETABLE SECURITIES (Notes 13 and 16)	7,435			5,691
CURRENT RECEIVABLES, NET (Note 5)	9,220			8,395
DEFERRED RENT RECEIVABLES, NET (Note 5)	115,418			101,142
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 3 and 4)	189,968			155,522
DEFERRED FINANCING COSTS, NET (Notes 2 and 7)	18,971			18,368
PREPAID EXPENSES AND OTHER ASSETS, NET	9,949			12,199
TOTAL ASSETS	$	4,616,084		$	3,446,795
LIABILITIES, NONCONTROLLING INTEREST AND CAPITAL
LIABILITIES:
Secured debt (Notes 3, 6, 7 and 16)	$	561,096		$	351,825
Exchangeable senior notes, net (Notes 6, 7 and 16)	163,944			306,892
Unsecured debt, net (Notes 6, 7 and 16)	1,130,895			980,569
Unsecured line of credit (Notes 6, 7 and 16)	185,000			182,000
Accounts payable, accrued expenses and other liabilities (Note 15)	154,734			81,713
Accrued distributions (Note 10)	28,924			22,692
Deferred revenue and acquisition-related intangible liabilities, net (Notes 3, 4 and 8)	117,904			79,781
Rents received in advance and tenant security deposits	37,654			26,917
Liabilities and deferred revenue of real estate assets held for sale (Note 17)	—			13,286
Total liabilities	2,380,151			2,045,675
COMMITMENTS AND CONTINGENCIES (Note 15)
7.45% SERIES A CUMULATIVE REDEEMABLE PREFERRED UNITS (Note 9)	—			73,638
CAPITAL (Notes 9 and 11):
Partners' Capital:
7.80% Series E Cumulative Redeemable Preferred units, no units issued at 12/31/2012, 1,610,000 units issued and outstanding ($40,250 liquidation preference) at 12/31/2011	—			38,425
7.50% Series F Cumulative Redeemable Preferred units, no units issued at 12/31/2012, 3,450,000 units issued and outstanding ($86,250 liquidation preference) at 12/31/2011	—			83,157
6.875% Series G Cumulative Redeemable Preferred units, 4,000,000 units issued and outstanding ($100,000 liquidation preference) at 12/31/2012 and no units issued at 12/31/2011	96,155			—
6.375% Series H Cumulative Redeemable Preferred units, 4,000,000 units issued and outstanding ($100,000 liquidation preference) at 12/31/2012 and no units issued at 12/31/2011	96,256			—
Common units, 74,926,981 and 58,819,717 held by the general partner and 1,826,503 and 1,718,131 held by common limited partners issued and outstanding, respectively	2,040,243			1,203,259
Total Partners' Capital	2,232,654			1,324,841
Noncontrolling interests in consolidated subsidiaries	3,279			2,641
Total capital	2,235,933			1,327,482
TOTAL LIABILITIES, NONCONTROLLING INTEREST AND CAPITAL	$	4,616,084		$	3,446,795

See accompanying notes to consolidated financial statements.

F - 9

KILROY REALTY, L.P.

CONSOLIDATED STATEMENTS OF OPERATIONS

(in thousands, except unit and per unit data)

	Year Ended December 31,
	2012			2011			2010
REVENUES:
Rental income	$	369,516		$	307,118		$	235,304
Tenant reimbursements	32,309			23,977			17,996
Other property income	3,087			6,534			1,694
Total revenues	404,912			337,629			254,994
EXPENSES:
Property expenses	79,357			66,821			51,169
Real estate taxes	34,479			29,633			23,474
Provision for bad debts	153			781			65
Ground leases (Notes 4 and 15)	3,168			1,779			984
General and administrative expenses	36,188			28,148			27,963
Acquisition-related expenses	4,937			4,053			2,248
Depreciation and amortization (Notes 2 and 4)	162,917			124,928			90,836
Total expenses	321,199			256,143			196,739
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (Note 16)	848			571			964
Interest expense (Note 7)	(79,114		)	(85,785		)	(55,082		)
Loss on early extinguishment of debt (Note 7)	—			—			(4,564		)
Total other (expenses) income	(78,266		)	(85,214		)	(58,682		)
INCOME (LOSS) FROM CONTINUING OPERATIONS	5,447			(3,728		)	(427		)
DISCONTINUED OPERATIONS (Note 17)
Income from discontinued operations	12,409			19,630			19,364
Net gain on dispositions of discontinued operations	259,245			51,587			949
Total income from discontinued operations	271,654			71,217			20,313
NET INCOME	277,101			67,489			19,886
Net income attributable to noncontrolling interests in consolidated subsidiaries	(638		)	(529		)	(162		)
NET INCOME ATTRIBUTABLE TO KILROY REALTY, L.P.	276,463			66,960			19,724
Preferred distributions (Note 11)	(14,108		)	(15,196		)	(15,196		)
Original issuance costs of redeemed preferred units (Notes 9 and 11)	(6,980		)	—			—
Total preferred distributions	(21,088		)	(15,196		)	(15,196		)
NET INCOME AVAILABLE TO COMMON UNITHOLDERS	$	255,375		$	51,764		$	4,528
Loss from continuing operations available to common unitholders per unit-basic (Note 20)	$	(0.24	)	$	(0.36	)	$	(0.33	)
Loss from continuing operations available to common unitholders per unit-diluted (Note 20)	$	(0.24	)	$	(0.36	)	$	(0.33	)
Net income available to common unitholders per unit-basic (Note 20)	$	3.56		$	0.86		$	0.07
Net income available to common unitholders per unit-diluted (Note 20)	$	3.56		$	0.86		$	0.07
Weighted average common units outstanding-basic (Note 20)	71,403,258			58,437,444			51,220,618
Weighted average common units outstanding-diluted (Note 20)	71,403,258			58,437,444			51,220,618
Distributions declared per common unit	$	1.40		$	1.40		$	1.40

See accompanying notes to consolidated financial statements.

F - 10

KILROY REALTY, L.P.

CONSOLIDATED STATEMENTS OF CAPITAL

(in thousands, except unit and per unit data)

	Partners' Capital								Total Partners' Capital			Noncontrolling Interests in Consolidated Subsidiaries
	Preferred Units			Number of Common Units		Common Units									Total Capital
BALANCE AS OF DECEMBER 31, 2009	$	121,582		44,871.893		$	760,756		$	882,338		$	1,500		$	883,838
Net income						19,724			19,724			162			19,886
Issuance of common units (Note 11)				9,200,000		299,847			299,847						299,847
Issuance of share-based compensation awards (Note 12)				3,239		2,151			2,151						2,151
Noncash amortization of share-based compensation						6,687			6,687						6,687
Repurchase of common units and restricted stock units				(59,782	)	(2,121		)	(2,121		)				(2,121		)
Settlement of restricted stock units for shares of common stock (Note 12)				53,451		(1,296		)	(1,296		)				(1,296		)
Exercise of stock options				4,000		83			83						83
Allocation to the equity component of cash paid upon repurchase of 3.25% Exchangeable Notes (Note 7)						(2,694		)	(2,694		)				(2,694		)
Other						25			25			(25		)	—
Preferred distributions						(15,196		)	(15,196		)				(15,196		)
Distributions declared per common unit ($1.40 per unit)						(73,455		)	(73,455		)				(73,455		)
BALANCE AS OF DECEMBER 31, 2010	121,582			54,072,801		994,511			1,116,093			1,637			1,117,730
Net income						66,960			66,960			529			67,489
Issuance of common units (Note 11)				6,392,805		233,312			233,312						233,312
Issuance of share-based compensation awards (Note 12)				68,727		2,739			2,739						2,739
Noncash amortization of share-based compensation						5,588			5,588						5,588
Repurchase of common units and restricted stock units				(11,485	)	(1,152		)	(1,152		)				(1,152		)
Exercise of stock options				15,000		395			395						395
Other						(475		)	(475		)	475			—
Preferred distributions						(15,196		)	(15,196		)				(15,196		)
Distributions declared per common unit ($1.40 per unit)						(83,423		)	(83,423		)				(83,423		)
BALANCE AS OF DECEMBER 31, 2011	121,582			60,537.848		1,203,259			1,324,841			2,641			1,327,482
Net income						276,463			276,463			638			277,101
Issuance of Series G Preferred units and Series H Preferred units (Note 11)	192,411								192,411						192,411
Redemption of Series E and Series F Preferred units (Note 11)	(121,582		)			(4,918		)	(126,500		)				(126,500		)
Redemption of Series A Preferred units (Note 9)						(2,062		)	(2,062		)				(2,062		)
Issuance of common units (Note 11)				16,024,618		672,102			672,102						672,102
Issuance of share-based compensation awards (Note 12)				62,137		1,291			1,291						1,291
Noncash amortization of share-based compensation (Note 12)						8,537			8,537						8,537
Repurchase of common units and restricted stock units (Note 12)				(22,312	)	(877		)	(877		)				(877		)
Settlement of restricted stock units (Note 12)				27,821		(784		)	(784		)				(784		)
Exercise of stock options				5,000		129			129						129
Issuance of common units in connection with an operating property acquisition (Notes 2 and 11)				118,372		5,604			5,604						5,604
Preferred distributions						(14,108		)	(14,108		)				(14,108		)
Distributions declared per common unit ($1.40 per unit)						(104,393		)	(104,393		)				(104,393		)
BALANCE AS OF DECEMBER 31, 2012	$	192,411		76,753,484		$	2,040,243		$	2,232,654		$	3,279		$	2,235,933

See accompanying notes to consolidated financial statements.

F - 11

KILROY REALTY, L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

	Year Ended December 31,
	2012			2011			2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$	277,101		$	67,489		$	19,886
Adjustments to reconcile net income to net cash provided by operating activities (including discontinued operations):
Depreciation and amortization of building and improvements and leasing costs	168,687			135,467			102,898
(Decrease) increase in provision for bad debts	(42		)	644			(1,063		)
Depreciation of furniture, fixtures and equipment	1,213			1,130			911
Noncash amortization of share-based compensation awards (Note 12)	7,670			4,482			6,031
Noncash amortization of deferred financing costs and net debt discounts	8,433			13,540			12,490
Noncash amortization of net (below)/above market rents (Note 4)	(6,699		)	1,056			1,377
Net gain on dispositions of discontinued operations (Note 17)	(259,245		)	(51,587		)	(949		)
Noncash amortization of deferred revenue related to tenant-funded tenant improvements (Note 8)	(9,136		)	(9,349		)	(9,689		)
Straight-line rents	(21,530		)	(21,331		)	(13,616		)
Loss on early extinguishment of debt (Note 7)	—			—			4,564
Net change in other operating assets	(1,297		)	(5,434		)	(9,065		)
Net change in other operating liabilities	17,320			2,779			5,509
Insurance proceeds received for property damage and other, net	(1,751		)	(630		)	543
Net cash provided by operating activities	180,724			138,256			119,827
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisitions of operating properties, net of cash acquired (Note 3)	(454,841		)	(603,301		)	(637,620		)
Expenditures for acquisitions of development and redevelopment properties (Note 3)	(333,942		)	—			—
Expenditures for operating properties	(86,377		)	(62,739		)	(71,099		)
Expenditures for development and redevelopment properties and undeveloped land	(83,310		)	(28,517		)	(21,832		)
Net proceeds received from dispositions of operating properties (Note 17)	263,572			64,171			14,978
Insurance proceeds received for property damage	1,751			—			—
Decrease (increase) in acquisition-related deposits	5,000			(5,000		)	—
(Increase) decrease in restricted cash (Note 3)	(18,359		)	1,103			3,120
Receipt of principal payments on note receivable	—			—			10,679
Net cash used in investing activities	(706,506		)	(634,283		)	(701,774		)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of Series G and Series H preferred units (Note 11)	192,411			—			—
Redemption of Series E and Series F preferred units (Note 11)	(126,500		)	—			—
Redemption of Series A preferred units (Note 9)	(75,000		)	—			—
Net proceeds from issuance of common units (Note 11)	672,102			233,312			299,847
Borrowings on unsecured line of credit	704,000			550,000			660,000
Repayments on unsecured line of credit	(701,000		)	(527,000		)	(598,000		)
Proceeds from the issuance of secured debt (Note 7)	97,000			135,000			71,000
Principal payments on secured debt	(106,262		)	(127,665		)	(103,247		)
Proceeds from the issuance of unsecured debt (Note 7)	150,000			324,476			572,672
Repayments of unsecured debt	—			—			(61,000		)
Repurchase of exchangeable senior notes (Note 7)	—			—			(151,097		)
Repayments of exchangeable senior notes (Note 7)	(148,000		)	—			—
Financing costs	(7,963		)	(9,060		)	(14,912		)
Decrease (increase) in loan deposits and other	—			2,859			(605		)
Repurchase/redemption of common units and restricted stock units	(1,661		)	(1,152		)	(3,417		)
Proceeds from exercise of stock options	129			395			83
Distributions paid to common unitholders	(97,386		)	(80,005		)	(69,224		)
Distributions paid to preferred unitholders	(14,165		)	(15,196		)	(15,196		)
Net cash provided by financing activities	537,705			485,964			586,904
Net increase (decrease) in cash and cash equivalents	11,923			(10,063		)	4,957
Cash and cash equivalents, beginning of year	4,777			14,840			9,883
Cash and cash equivalents, end of year	$	16,700		$	4,777		$	14,840

F - 12

KILROY REALTY, L.P.

CONSOLIDATED STATEMENTS OF CASH FLOWS -(Continued)

(in thousands)

	Year Ended December 31,
	2012		2011		2010
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $17,657, $7,615, and $7,697 as of December 31, 2012, 2011 and 2010, respectively	$	71,633	$	68,280	$	45,986
NONCASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	$	54,198	$	14,301	$	19,563
Tenant improvements funded directly by tenants	$	17,719	$	3,288	$	4,758
Assumption of secured debt in connection with property acquisition (Notes 3 and 7)	$	221,032	$	30,042	$	51,079
Assumption of other assets and liabilities in connection with operating and development property acquisitions, net (Note 3)	$	37,535	$	4,515	$	10,840
NONCASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Note 11)	$	26,863	$	21,188	$	18,925
Accrual of distributions payable to preferred unitholders (Note 11)	$	1,694	$	1,909	$	1,909
Issuance of share-based compensation awards, net (Note 12)	$	31,396	$	7,797	$	5,910
Issuance of common units in connection with an operating property acquisition (Note 3)	$	5,604	$	—	$	—

See accompanying notes to consolidated financial statements.

F - 13

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Three Years Ended December 31, 2012

1. Organization and Ownership

Organization

Kilroy Realty Corporation (the "Company") is a self-administered real estate investment trust ("REIT") active in office submarkets along the West Coast. We own, develop, acquire and manage real estate assets, consisting primarily of Class A properties in the coastal regions of Los Angeles, Orange County, San Diego County, the San Francisco Bay Area and greater Seattle, which we believe have strategic advantages and strong barriers to entry. Class A real estate encompasses attractive and efficient buildings of high quality that are attractive to tenants, are well-designed and constructed with above-average material, workmanship and finishes and are well-maintained and managed. We qualify as a REIT under the Internal Revenue Code of 1986, as amended (the "Code"). The Company's common stock is publicly traded on the New York Stock Exchange ("NYSE") under the ticker symbol "KRC."

We own our interests in all of our real estate assets through Kilroy Realty, L.P. (the "Operating Partnership") and Kilroy Realty Finance Partnership, L.P. (the "Finance Partnership"). We conduct substantially all of our operations through the Operating Partnership. Unless stated otherwise or the context indicates otherwise, the terms "Kilroy Realty Corporation" or the "Company," "we," "our," and "us" refer to Kilroy Realty Corporation and its consolidated subsidiaries and the term "Operating Partnership" refers to Kilroy Realty, L.P. and its consolidated subsidiaries. The descriptions of our business, employees, and properties apply to both the Company and the Operating Partnership.

Our portfolio of operating properties was comprised of the following office properties at December 31, 2012. During the fourth quarter of 2012 we disposed of our industrial portfolio and, as a result, no longer owned any industrial properties at December 31, 2012 (see Note 17 and 18 for further discussion).

	Number of Buildings	Rentable Square Feet (unaudited)	Number of Tenants	Percent Occupied
Office Properties	114	13,249,780	530	92.8	%

Our stabilized portfolio includes all of our properties with the exception of undeveloped land, development and redevelopment properties currently under construction or committed for construction including 9455 Towne Center in San Diego, CA, which was moved from the stabilized portfolio to the development pipeline in the fourth quarter of 2012, "lease-up" properties and properties held-for-sale. We define redevelopment properties as those projects for which we expect to spend significant development and construction costs on existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. We define "lease-up" properties as properties we recently developed or redeveloped that have not yet reached 95% occupancy and are within one year following cessation of major construction activities. As of December 31, 2012, the following properties were excluded from our stabilized portfolio:

	Number of Properties	Estimated Rentable Square Feet (unaudited) (1)
Development properties under construction	4	1,416,000
Redevelopment properties under construction	1	410,000
Lease-up properties	1	98,000

________________________

(1) Estimated rentable square feet upon completion.

As of December 31, 2012, all of our properties and development and redevelopment projects are owned and all of our business is currently conducted in the state of California with the exception of ten office properties located in the state of Washington.

As of December 31, 2012, the Company owned a 97.6% general partnership interest in the Operating Partnership. The remaining 2.4% common limited partnership interest in the Operating Partnership as of December 31, 2012 was owned by non-affiliated investors and certain of our directors and officers (see Note 9). Both the general and limited common partnership interests in the Operating Partnership are denominated in common units. The number of common units held by the Company is at all times equivalent to the number of outstanding shares of the Company's common stock, and the rights of all the common units to quarterly distributions and payments in liquidation mirror those of the Company's common stockholders. The common limited partners have certain redemption rights as provided in the Operating Partnership's Seventh Amended and Restated Agreement of Limited Partnership (as amended, the “Partnership Agreement”) (see Note 9).

Kilroy Realty Finance, Inc., a wholly-owned subsidiary of the Company, is the sole general partner of the Finance Partnership and owns a 1.0% general partnership interest. The Operating Partnership owns the remaining 99.0% limited partnership interest. Kilroy Services, LLC ("KSLLC"), which is a wholly-owned subsidiary of the Operating Partnership, is the entity through which

F - 14

we conduct substantially all of our development activities. With the exception of the Operating Partnership, all of our subsidiaries are wholly-owned.

2. Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The consolidated financial statements of the Company include the consolidated financial position and results of operations of the Company, the Operating Partnership, the Finance Partnership, KSLLC, and all of our wholly-owned subsidiaries. The consolidated financial statements of the Operating Partnership include the consolidated financial position and results of operations of the Operating Partnership, the Finance Partnership, KSLLC, and all wholly-owned and controlled subsidiaries of the Operating Partnership. All intercompany balances and transactions have been eliminated in the consolidated financial statements.

Consolidated Variable Interest Entities

As of December 31, 2012 the consolidated financial statements of the Company and the Operating Partnership also included two variable interest entities ("VIEs") in which we are deemed to be the primary beneficiary. During the year ended December 31, 2012, one operating property and one development project were acquired in two separate transactions and transferred to two special purpose VIEs to facilitate potential Section 1031 Exchanges. To realize the tax deferral available under the Section 1031 Exchange, the Company must complete the Section 1031 Exchanges, if any, and take title to the to-be-exchanged properties within 180 days of the acquisition dates (see Note 3). The VIEs were terminated subsequent to year-end. The impact of consolidating the VIEs increased the Company's total assets and liabilities by approximately $337.0 million (of which $319.8 million is related to real estate held for investment on our consolidated balance sheets) and $111.1 million, respectively, at December 31, 2012. As of December 31, 2011, the consolidated financial statements of the Company and the Operating Partnership included one VIE in which we were deemed to be the primary beneficiary, which was established in September 2011 to facilitate a Section 1031 Exchange. The impact of consolidating this VIE increased the Company's total assets and liabilities by approximately $108.5 million (of which $101.4 million was related to real estate held for investment on our consolidated balance sheets) and $7.3 million, respectively, at December 31, 2011. This Section 1031 Exchange was completed in January 2012 and this entity was no longer a VIE at December 31, 2012.

Change in Segment Reporting

At December 31, 2012 we only had one segment, which was our office properties segment, because all of our industrial properties were sold during the year ended December 31, 2012. During the year ended December 31, 2011 we had one reportable segment, which was our office properties segment, and we had one non-reportable segment, which was our industrial properties segment.

For the year ended December 31, 2011, the amount of revenues and Net Operating Income generated by our industrial properties, in relation to our total consolidated operating portfolio revenues and Net Operating Income, fell below the required 10% quantitative reporting threshold and the industrial properties were no longer considered to be a reportable segment under GAAP.  For the year ended December 31, 2010, the amount of revenues and Net Operating Income generated by our industrial properties, in relation to our total consolidated operating portfolio revenues and Net Operating Income, was greater than the required 10% quantitative reporting threshold and the industrial properties were considered to be a reportable segment under GAAP.

Significant Accounting Policies

Acquisitions

We record the acquired tangible and intangible assets and assumed liabilities of acquisitions of operating properties and development and redevelopment opportunities that meet the accounting criteria to be accounted for as business combinations at fair value at the acquisition date. The acquired assets and assumed liabilities for an acquisition generally include but are not limited to: land, buildings and improvements, undeveloped land and construction in progress; and identified tangible and intangible assets and liabilities associated with in-place leases, including tenant improvements, leasing costs, value of above-market and below-market operating leases and ground leases, acquired in-place lease values and tenant relationships, if any. Any debt assumed and equity (including common units of the Operating Partnership) issued in connection with a property acquisition is recorded at fair value on the date of acquisition.

The fair value of land is derived from comparable sales of land within the same submarket and/or region. The fair value of buildings and improvements, tenant improvements, and leasing costs are based upon current market replacement costs and other relevant market rate information.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The fair value of the above-market or below-market component of an acquired in-place operating lease is based upon the present value (calculated using a market discount rate) of the difference between (i) the contractual rents to be paid pursuant to the lease over its remaining non-cancellable lease term and (ii) management's estimate of the rents that would be paid using fair market rental rates and rent escalations at the date of acquisition measured over the remaining non-cancellable term of the lease for above-market operating leases and the initial non-cancellable term plus the term of any below-market fixed rate renewal options, if applicable, for below-market operating leases. Our below-market operating leases generally do not include fixed rate or below-market renewal options. The amounts recorded for above-market operating leases are included in deferred leasing costs and acquisition-related intangibles, net on the balance sheet and are amortized on a straight-line basis as a reduction of rental income over the remaining term of the applicable leases. The amounts recorded for below-market operating leases are included in deferred revenue and acquisition-related liabilities, net on the balance sheet and are amortized on a straight-line basis as an increase to rental income over the remaining term of the applicable leases plus the term of any below-market fixed rate renewal options, if applicable.

The fair value of acquired in-place leases is derived based on management's assessment of lost revenue and costs incurred for the period required to lease the "assumed vacant" property to the occupancy level when purchased. The amount recorded for acquired in-place leases is included in deferred leasing costs and acquisition-related intangibles, net on the balance sheet and amortized as an increase to depreciation and amortization expense over the remaining term of the applicable leases.

We record the acquisition of undeveloped land that does not meet the accounting criteria to be accounted for as business combinations and the subsequent acquisition of the fee interest in land underlying our properties at the purchase price paid and capitalize the associated acquisition costs. During the year ended December 31, 2012, we capitalized $0.7 million in acquisition costs associated with the acquisition of undeveloped land.

Fully amortized intangible assets are written off on January 1st of each fiscal year.

Operating Properties

Operating properties are generally carried at historical cost less accumulated depreciation. Properties held for sale are reported at the lower of the carrying value or the fair value less estimated cost to sell. The cost of operating properties includes the purchase price or development costs of the properties. Costs incurred for the renovation and betterment of the operating properties are capitalized to our investment in that property. Maintenance and repairs are charged to expense as incurred.

When evaluating properties to be held and used for potential impairment, we first evaluate whether there are any indicators of impairment for any of our properties. If any impairment indicators are present for a specific property, we then perform an undiscounted cash flow analysis and compare the net carrying amount of the property to the property's estimated undiscounted future cash flow over the anticipated holding period. If the estimated undiscounted future cash flow is less than the net carrying amount of the property, we then perform an impairment loss calculation to determine if the fair value of the property is less than the net carrying value of the property. Our impairment loss calculation compares the net carrying amount of the property to the property's estimated fair value, which may be based on estimated discounted future cash flow calculations or third-party valuations or appraisals. We would recognize an impairment loss if the asset's net carrying amount exceeds the asset's estimated fair value. If we were to recognize an impairment loss, the estimated fair value of the asset (less costs to sell for assets held for sale) would become its new cost basis. For a depreciable long-lived asset, the new cost basis would be depreciated (amortized) over the remaining useful life of that asset. We did not record any impairment losses for the periods presented.

Cost Capitalization

All costs clearly associated with the development, redevelopment and construction of a property are capitalized as project costs, including internal compensation costs. In addition, the following costs are capitalized as project costs during periods in which activities necessary to prepare development and redevelopment properties for its intended use are in progress: pre-construction costs essential to the development of the property, interest, real estate taxes, insurance.

• For development and redevelopment properties that are pre-leased, we cease capitalization when revenue recognition commences, which is upon substantial completion of tenant improvements.

• For development and redevelopment properties that are not pre-leased, we may not immediately build out the tenant improvements. Therefore we cease capitalization when revenue recognition commences upon substantial completion of the tenant improvements, but in any event not later than one year after the cessation of major construction activities. We also cease capitalization on a development or redevelopment property when activities necessary to prepare the property for its intended use have been suspended.

• For development or redevelopment properties with multiple tenants and staged leasing, we cease capitalization and begin depreciation on the portion of the development or redevelopment property for which revenue recognition has commenced.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Once major construction activity has ceased and the development or redevelopment property is in the lease-up phase, the costs capitalized to construction in progress are transferred to land and improvements, buildings and improvements, and deferred leasing costs on our consolidated balance sheets as the historical cost of the property.

Depreciation and Amortization of Buildings and Improvements

The cost of buildings and improvements and tenant improvements are depreciated using the straight-line method of accounting over the estimated useful lives set forth in the table below. Depreciation expense for buildings and improvements, including discontinued operations, for the three years ended December 31, 2012, 2011, and 2010 was $125.9 million, $106.0 million and $86.3 million, respectively.

Asset Description	Depreciable Lives
Buildings and improvements	25 – 40 years
Tenant improvements	1 – 20 years(1)

________________________

(1) Tenant improvements are amortized over the shorter of the lease term or the estimated useful life. 

Discontinued Operations and Properties Held for Sale

The revenues and expenses of operating properties that have been sold, if material, and the revenues and expenses of operating properties that have been classified as held for sale, if material, are reported in the consolidated statements of operations as discontinued operations for all periods presented through the date of the applicable disposition. The net gains (losses) on disposition of operating properties are reported in the consolidated statements of operations as discontinued operations in the period the properties are sold. In determining whether the revenues, expenses, and net gains (losses) on dispositions of operating properties are reported as discontinued operations, we evaluate whether we have any significant continuing involvement in the operations, leasing, or management of the sold property. If we were to determine that we had any significant continuing involvement, the revenues, expenses and net gain (loss) on dispositions of the operating property would not be recorded in discontinued operations.

An operating property is classified as held for sale when certain criteria are met, including but not limited to the availability of the asset for immediate sale, the existence of an active program to locate a buyer, and the probable sale or transfer of the asset within one year. If such criteria are met, we present the applicable assets and liabilities related to the property held for sale, if material, separately on the balance sheet and we would cease to record depreciation and amortization expense. Properties held for sale are reported at the lower of their carrying value or their estimated fair value less the estimated costs to sell. As of December 31, 2012, we did not have any buildings classified as held for sale, and as of December 31, 2011, we had two buildings classified as held for sale, which were sold in January 2012 (see Note 17).

Revenue Recognition

We recognize revenue from rent, tenant reimbursements, parking, and other revenue once all of the following criteria are met:

• the agreement has been fully executed and delivered;

• services have been rendered;

• the amount is fixed or determinable; and

• the collectability of the amount is reasonably assured.

Minimum annual rental revenues are recognized in rental revenues on a straight-line basis over the term of the related lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

When management concludes that we are the owner of tenant improvements for accounting purposes, management records the cost to construct the tenant improvements as a capital asset. In addition, management records the cost of certain tenant improvements paid for or reimbursed by tenants as capital assets when management concludes that we are the owner of such tenant improvements. For these tenant improvements, management records the amount funded or reimbursed by tenants as deferred revenue, which is amortized on a straight-line basis as additional rental income over the term of the related lease.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

When management concludes that the tenant is the owner of tenant improvements for accounting purposes, management records our contribution towards those improvements as a lease incentive, which is included in deferred leasing costs and acquisition-related intangibles, net on our consolidated balance sheets and amortized as a reduction to rental income on a straight-line basis over the term of the lease.

Tenant Reimbursements

Reimbursements from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs, are recognized as revenue in the period the recoverable costs are incurred. Tenant reimbursements are recognized and recorded on a gross basis, as we are generally the primary obligor with respect to purchasing goods and services from third-party suppliers, have discretion in selecting the supplier, and have credit risk.

Other Property Income

Other property income primarily includes amounts recorded in connection with lease terminations and tenant bankruptcy settlement payments. Lease termination fees are amortized over the remaining lease term, if applicable. If there is no remaining lease term, they are recognized when received and realized. Other property income also includes miscellaneous income from tenants, such as fees related to the restoration of leased premises to their original condition and fees for late rental payments.

Allowances for Uncollectible Tenant and Deferred Rent Receivables

We carry our current and deferred rent receivables net of allowances for uncollectible amounts. Our determination of the adequacy of these allowances is based primarily upon evaluations of individual receivables, current economic conditions, historical loss experience, and other relevant factors. The allowances are increased or decreased through the provision for bad debts on our consolidated statements of operations.

Cash and Cash Equivalents

We consider all highly-liquid investments with original maturities of three months or less to be cash equivalents.

Restricted Cash

Restricted cash consists of cash proceeds from dispositions that are temporarily held at qualified intermediaries for purposes of facilitating potential Section 1031 Exchanges and cash held in escrow related to acquisition holdbacks. Restricted cash also includes cash held as collateral to provide credit enhancement for the Operating Partnership's mortgage debt, including cash reserves for capital expenditures, tenant improvements, and property taxes.

Marketable Securities / Deferred Compensation Plan

Marketable securities reported in our consolidated balance sheets represent the assets held in connection with the Kilroy Realty Corporation 2007 Deferred Compensation Plan (the "Deferred Compensation Plan") (see Note 13). The Deferred Compensation Plan assets are held in a limited rabbi trust and invested in various mutual and money market funds. As a result, the marketable securities are treated as trading securities for financial reporting purposes and are adjusted to fair value at the end of each accounting period, with the corresponding gains and losses recorded in interest income and other net investment gains.

At the time eligible management employees ("Participants") defer compensation or earn mandatory Company contributions, or if we were to make a discretionary contribution, we record compensation cost and a corresponding deferred compensation plan liability, which is included in accounts payable, accrued expenses, and other liabilities on our consolidated balance sheets. This liability is adjusted to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each Participant, and the impact of adjusting the liability to fair value is recorded as an increase or decrease to compensation cost. The impact of adjusting the deferred compensation plan liability to fair value and the changes in the value of the marketable securities held in connection with the Deferred Compensation Plan generally offset and therefore does not significantly impact net income.

Deferred Leasing Costs

Costs incurred in connection with successful property leasing are capitalized as deferred leasing costs and classified as investment activities in the statement of cash flows. Deferred leasing costs consist primarily of leasing commissions and also include certain internal payroll costs and lease incentives, which are amortized using the straight-line method of accounting over the lives of the leases which generally range from one to 20 years. We reevaluate the remaining useful lives of leasing costs as the creditworthiness of our tenants and economic and market conditions change. If we determine that the estimated remaining life of a lease has changed, we adjust the amortization period accordingly. Fully amortized deferred leasing costs are written off on January 1st of each fiscal year.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Deferred Financing Costs

Financing costs related to the origination or assumption of long-term debt are deferred and generally amortized using the straight-line method of accounting, which approximates the effective interest method, over the contractual terms of the applicable financings. As of December 31, 2012 and 2011, deferred financing costs were reported net of accumulated amortization of $16.6 million and $16.8 million, respectively.

Debt Discounts and Premiums

Original issuance debt discounts and discounts/premiums related to recording debt acquired in connection with operating property acquisitions at fair value are generally amortized and accreted on a straight-line basis, which approximates the effective interest method. Discounts are recorded as additional interest expense from date of issuance or acquisition through the contractual maturity date of the related debt. Premiums are recorded as a reduction to interest expense from the date of issuance or acquisition through the contractual maturity date of the related debt. Our secured debt is presented including unamortized premiums of $7.2 million and $0.8 million as of December 31, 2012 and 2011, respectively. Our unsecured senior notes are presented net of unamortized discounts of $2.1 million and $2.4 million, as of December 31, 2012 and 2011, respectively.

Exchangeable Debt Instruments

The initial proceeds from exchangeable debt that may be settled in cash, including partial cash settlements, are bifurcated between a liability component and an equity component associated with the embedded conversion option. The liability and equity components of exchangeable debt are separately accounted for in a manner such that the interest expense on the exchangeable debt is not recorded at the stated rate of interest but rather at an effective rate that reflects the issuer’s conventional debt borrowing rate at the date of issuance.

We calculate the liability component of exchangeable debt based on the present value of the contractual cash flows discounted at a comparable market conventional debt borrowing rate at the date of issuance. The difference between the principal amount and the fair value of the liability component is reported as a discount on the exchangeable debt that is accreted as additional interest expense from the issuance date through the contractual maturity date using the effective interest method. A portion of this additional interest expense is capitalized to the development and redevelopment balances qualifying for interest capitalization each period. The liability component of the exchangeable debt is reported net of discounts on our consolidated balance sheets.

We calculate the equity component of exchangeable debt based on the difference between the initial proceeds received from the issuance of the exchangeable debt and the fair value of the liability component at the issuance date. The equity component is included in additional paid-in-capital, net of issuance costs, on our consolidated balance sheets. We allocate issuance costs for exchangeable debt between the liability and the equity components based on their relative values.

Gains and Losses on Early Extinguishment of Debt

Gains and losses on early extinguishment of debt represents the gains and losses recorded in connection with the repurchases of portions of our 3.25% Exchangeable Notes, which were outstanding during the year ended December 31, 2011 and repaid during the year ended December 31, 2012 (see Note 7). We calculate the gain or loss on early extinguishment of debt as the difference on the repurchase date between the estimated fair value of the liability component and the net carrying amount of the repurchased exchangeable debt. Deferred financing costs are written off against the gain on early extinguishment of debt or added to the loss on early extinguishment of debt in proportion to the exchangeable debt repurchased.

Noncontrolling Interests in the Company's Consolidated Financial Statements

Noncontrolling interests in the Company's consolidated financial statements represent the issued 1,510,000 7.45% Series A Cumulative Redeemable Preferred Units of the Operating Partnership (“Series A Preferred Units”) which were outstanding at December 31, 2011 and common limited partnership interests in the Operating Partnership not held by the Company (“noncontrolling common units”).

The Series A Preferred Units were presented in the temporary equity section of the Company's consolidated balance sheets after total liabilities and before equity and reported at redemption value, less issuance costs, given that the Series A Preferred Units contained a right of redemption at the option of the holders in the event of certain corporate events. On August 15, 2012, the Operating Partnership redeemed all Series A Preferred Units (see Note 9).

Noncontrolling common units are presented in the equity section of the Company's consolidated balance sheets and reported at their proportionate share of the net assets of the Operating Partnership. Noncontrolling interests with redemption provisions that permit the issuer to settle in either cash or shares of common stock at the option of the issuer must be further evaluated to determine whether equity or temporary equity classification on the balance sheet is appropriate. Since the common units contain such a provision, we evaluated the accounting guidance and determined that the common units qualify for equity presentation in the Company's consolidated financial statements (see Note 9).

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Net income attributable to noncontrolling common units is allocated based on their relative ownership percentage of the Operating Partnership during the reported period. The noncontrolling interest ownership percentage is determined by dividing the number of noncontrolling common units by the total number of common units outstanding. The issuance or redemption of additional shares of common stock or common units results in changes to the noncontrolling interest percentage as well as the total net assets of the Company. As a result, all equity transactions result in an allocation between equity and the noncontrolling interest in the Company’s consolidated balance sheets and statements of equity to account for the changes in the noncontrolling interest ownership percentage as well as the change in total net assets of the Company.

Preferred Partnership Interests on the Operating Partnership's Consolidated Balance Sheets

Preferred partnership interests of the Operating Partnership represent the issued and outstanding 4,000,000 6.875% Series G Cumulative Redeemable Preferred Units ("Series G Preferred Units") and the 4,000,000 6.375% Series H Cumulative Redeemable Preferred Units ("Series H Preferred Units"), which were outstanding as of December 31, 2012. The Series A Preferred Units, 1,610,000 7.80% Series E Cumulative Redeemable Preferred Units ("Series E Preferred Units") and 3,450,000 7.50% Series F Cumulative Redeemable Preferred Units ("Series F Preferred Units") were outstanding as of December 31, 2011 and redeemed during the year ended December 31, 2012.

The Series A Preferred Units were presented in the temporary equity section of the Operating Partnership's consolidated balance sheets after total liabilities and before equity and reported at redemption value, less issuance costs, given that the Series A Preferred Units contain a right of redemption at the option of the holders in the event of certain corporate events (see Note 9).

The Series G and Series H Preferred Units are presented in the permanent equity section of the Operating Partnership's consolidated balance sheets given that the Series G and Series H Preferred Units may be redeemed only at our option (see Note 11). The Company is the holder of both the Series G and Series H Preferred Units and for each Series G and Series H Preferred Unit, the Company has an equivalent number of shares of the Company's 6.875% Series G Cumulative Redeemable Preferred Stock and shares of the Company's 6.375% Series H Cumulative Redeemable Preferred Stock publicly issued and outstanding. The Series E Preferred Units and Series F Preferred Units were presented in the permanent equity section of the Operating Partnership's consolidated balance sheets at December 31, 2011, similar to the Series G and Series H Preferred Units.

Common Partnership Interests on the Operating Partnership's Consolidated Balance Sheets

The common units held by the Company and the noncontrolling common units held by the common limited partners are both presented in the permanent equity section of the Operating Partnership's consolidated balance sheets in partners' capital. The redemption rights of the noncontrolling common units permit us to settle the redemption obligation in either cash or shares of the Company's common stock at our option (see Note 9).

Noncontrolling Interests on the Operating Partnership's Consolidated Balance Sheets

Noncontrolling interests of the Operating Partnership represent the Company's 1.0% general partnership interest in the Finance Partnership. This noncontrolling interest is presented in the permanent equity section of the Operating Partnership's consolidated balance sheets given that these interests are not convertible or redeemable into any other ownership interest of the Company or the Operating Partnership.

Equity Offerings

Underwriting commissions and offering costs incurred in connection with common equity offerings and our at-the-market stock offering program (see Note 10) are reflected as a reduction of additional paid-in capital. Issuance costs incurred in connection with preferred equity offerings are reflected as a reduction of the carrying value of the preferred equity.

The Company records preferred stock issuance costs as a non-cash preferred equity distribution at the time we notify the holders of preferred stock or units of our intent to redeem such shares or units.

The net proceeds from any equity offering of the Company are contributed to the Operating Partnership in exchange for a number of common or preferred units equivalent to the number of shares of common or preferred stock issued and are reflected in the Operating Partnership's consolidated financial statements as an increase in partners' capital.

Share-based Incentive Compensation Accounting

Compensation cost for all share-based awards, including options, requires measurement at estimated fair value on the grant date and recognition of the compensation cost is recognized over the service vesting period, which represents the requisite service period, on a straight-line basis. The grant date fair value of market measure-based share-based compensation plans are calculated using a Monte Carlo simulation pricing model. The grant date fair value of stock option grants is calculated using the Black-Scholes valuation model.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

For share-based awards in which the performance period precedes the grant date, we recognize compensation cost over the requisite service period, which includes both the performance and service vesting periods, using the accelerated attribution expense method. The requisite service period begins on the date the Executive Compensation Committee authorizes the award and adopts any relevant performance measures.

During the performance period for a share-based award program when the performance period precedes the grant date, we estimate the total compensation cost of the potential future awards. We then record compensation cost equal to the portion of the requisite service period that has elapsed through the end of the reporting period. For programs with performance-based measures, the total estimated compensation cost is based on our most recent estimate of the probable achievement of the pre-established specific corporate performance measures. These estimates are based on our latest internal forecasts for each performance measure. For programs with market measures, the total estimated compensation cost is based on the fair value of the award at the reporting date.

In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of Company common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period.

For share based awards granted by the Company, the Operating Partnership issues a number of common units equal to the number of shares of common stock ultimately granted by the Company in respect of such awards.

Basic and Diluted Net Income (Loss) Available to Common Stockholders per Share

Basic net income (loss) available to common stockholders per share is computed by dividing net income (loss) available to common stockholders, after the allocation of income to participating securities, by the weighted-average number of vested shares of common stock outstanding, for the period. Diluted net income (loss) available to common stockholders per share is computed by dividing net income (loss) available for common stockholders, after the allocation of income to participating securities, by the sum of the weighted-average number of shares of common stock outstanding for the period plus the assumed exercise of all dilutive securities. The impact of the outstanding common units is considered in the calculation of diluted net income (loss) available to common stockholders per share. The common units are not reflected in the diluted net income (loss) available to common stockholders per share calculation because the exchange of common units into common stock is on a one for one basis, and the common units are allocated net income on a per share basis equal to the common stock (see Note 19). Accordingly, any exchange would not have any effect on diluted net income (loss) available to common stockholders per share.

Nonvested share-based payment awards (including nonvested restricted stock units ("RSUs") and dividend equivalents issued to holders of RSUs) containing nonforfeitable rights to dividends or dividend equivalents are accounted for as participating securities and included in the computation of basic and diluted net income (loss) available to common stockholders per share pursuant to the two-class method. The dilutive effect of stock options are reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. The dilutive effect of Exchangeable Notes are reflected in the weighted average diluted outstanding shares calculation when the average quoted trading price of the Company's common stock on the NYSE for the periods presented was above the Exchangeable Notes exchange prices. The dilutive effect of the outstanding nonvested shares of common stock (“nonvested shares”) and RSUs that have not yet been granted but are contingently issuable under the share-based compensation programs is reflected in the weighted average diluted shares calculation by application of the treasury stock method at the beginning of the quarterly period in which all necessary conditions have been satisfied.

Basic and Diluted Net Income (Loss) Available to Common Unitholders per Unit

Basic net income (loss) available to common unitholders per unit is computed by dividing net income (loss) available to common unitholders, after the allocation of income to participating securities, by the weighted-average number of vested common units outstanding, for the period. Diluted net income (loss) available to common unitholders per unit is computed by dividing net income (loss) available to common unitholders, after the allocation of income to participating securities, by the sum of the weighted-average number of common units outstanding for the period plus the assumed exercise of all dilutive securities.

The dilutive effect of stock options, Exchangeable Notes, outstanding nonvested shares, RSUs, and awards containing nonforfeitable rights to dividend equivalents are reflected in diluted net income (loss) available to common unitholders per unit in the same manner as noted above for net income (loss) available to common stockholders per share.

Fair Value Measurements

The fair value of our financial assets and liabilities are disclosed in Note 16 to our consolidated financial statements. The only financial assets recorded at fair value on a recurring basis in our consolidated financial statements are our marketable securities. We elected not to apply the fair value option for any of our eligible financial instruments or other items.

We determine the estimated fair value of financial assets and liabilities utilizing a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions. This hierarchy requires the use of observable market data when available. The following is the fair value hierarchy:

• Level 1—quoted prices for identical instruments in active markets;

• Level 2—quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and

• Level 3—fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.

We determine the fair value for the marketable securities using quoted prices in active markets for identical assets. Our other financial instruments, which are only disclosed at fair value, are comprised of secured debt, unsecured senior notes, unsecured line of credit, unsecured term loan facility and Exchangeable Notes.

We generally determine the fair value of our secured debt, unsecured line of credit, and unsecured term loan facility by performing discounted cash flow analyses using an appropriate market discount rate. We calculate the market rate by obtaining period-end treasury rates for maturities that correspond to the maturities of our fixed-rate debt and then adding an appropriate credit spread based on information obtained from third-party financial institutions. We calculate the market rate of our unsecured line of credit and unsecured term loan facility by obtaining the period-end London Interbank Offered Rate ("LIBOR") rate and then adding an appropriate credit spread based on information obtained from third-party financial institutions. These credit spreads take into account factors, including but not limited to, our credit profile, the tenure of the debt, amortization period, whether the debt is secured or unsecured, and the loan-to-value ratio of the debt to the collateral. These calculations are significantly affected by the assumptions used, including the discount rate, credit spreads, and estimates of future cash flow. We determine the fair value of the liability component of our Exchangeable Notes by performing discounted cash flow analyses using an appropriate market interest rate based upon spreads for our publicly traded debt. We determine the fair value of each of our publicly traded unsecured senior notes based on their quoted trading price at the end of the reporting period, if such prices are available.

Carrying amounts of our cash and cash equivalents, restricted cash, and accounts payable approximate fair value due to their short-term maturities.

Income Taxes

We have elected to be taxed as a REIT under Sections 856 through 860 of the Code. To qualify as a REIT, we must distribute annually at least 90% of our adjusted taxable income, as defined in the Code, to our stockholders and satisfy certain other organizational and operating requirements. For distributions with respect to taxable years ended on or before December 31, 2011, IRS guidance allows REITs to satisfy up to 90% of this requirement through the distribution of shares of common stock, if certain conditions are met. We generally will not be subject to federal income taxes if we distribute 100% of our taxable income for each year to our stockholders. If we fail to qualify as a REIT in any taxable year, we will be subject to federal income taxes (including any applicable alternative minimum tax) on our taxable income at regular corporate rates and we may not be able to qualify as a REIT for four subsequent taxable years. Even if we qualify for taxation as a REIT, we may be subject to certain state and local taxes on our income and property and to federal income taxes and excise taxes on our undistributed taxable income. We believe that we have met all of the REIT distribution and technical requirements for the years ended December 31, 2012, 2011 and 2010, and we were not subject to any federal income taxes (see Note 21). We intend to continue to adhere to these requirements and maintain the Company’s REIT status.

In addition, any taxable income from our taxable REIT subsidiary, which was formed in August 2002, is subject to federal, state, and local income taxes. For the year ended December 31, 2012 the taxable REIT subsidiary had less than $60,000 of taxable income and for the years ended December 31, 2011 and 2010 the taxable REIT subsidiary had less than $30,000 of taxable income.

Uncertain Tax Positions

We include favorable tax positions in the calculation of tax liabilities if it is more likely than not that our adopted tax position will prevail if challenged by tax authorities.

As a result of our REIT status, we are able to claim a dividends-paid deduction on our tax return to deduct the full amount of common and preferred dividends paid to stockholders when computing our annual taxable income. Since this dividends-paid deduction has historically exceeded our taxable income, the Company has historically had significant return of capital to its stockholders. In order for us to be required to record any unrecognized tax benefits or additional tax liabilities, any adjustment for potential uncertain tax positions would need to exceed the return of capital.

We evaluated the potential impact of identified uncertain tax positions for all tax years still subject to potential audit under state and federal income tax law and concluded that our return of capital would not be materially affected for any of the years still

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

subject to potential audit. As of December 31, 2012, the years still subject to audit are 2008 through 2011 under the California state income tax law and 2009 through 2011 under the federal income tax law. We concluded that we did not have any unrecognized tax benefits or any additional tax liabilities as of December 31, 2012 and 2011.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reported periods. Actual results could differ from those estimates.

Concentration of Credit Risk

All of our properties and all of our business is currently conducted in the state of California with the exception of the ownership and operation of ten office properties located in the state of Washington. The ability of the tenants to honor the terms of their leases is dependent upon the economic, regulatory, and social factors affecting the communities in which the tenants operate.

As of December 31, 2012, our 15 largest tenants represented approximately 34.1% of total annualized base rental revenues.

We have deposited cash with financial institutions that is insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 per institution. As of December 31, 2012 and 2011, we had cash accounts in excess of FDIC insured limits.

Recent Accounting Pronouncements

In October 2012, the FASB issued Accounting Standards Update 2012-04, Technical Corrections and Improvements ("ASU 2012-04"), which makes certain technical corrections and “conforming fair value amendments” to the FASB Accounting Standards Codification. The amendments affect various Codification topics and apply to all reporting entities within the scope of those topics. These provisions of the amendment are effective upon issuance, except for amendments that are subject to transition guidance, which will be effective for fiscal periods beginning after December 15, 2012. The provisions of ASU 2012-04 are not expected to have a material impact on our consolidated financial statements.

Effective January 1, 2012, we adopted the provisions of ASU No. 2011-04, Amendment to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs ("ASU 2011-04"), which amended ASC Topic 820, Fair Value Measurement. The objective of this guidance is to develop common requirements for measuring fair value and for disclosing information about fair value measurements in accordance with GAAP and International Financial Reporting Standards. The guidance also requires expanded fair value disclosures related to Level 3 financial instruments and Level 3 financial instrument transfers. The guidance does not require any new fair value measurements. The adoption of this guidance did not have a material impact on our consolidated financial statements or notes to our consolidated financial statements.

F - 23

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

3. Acquisitions

Operating Properties

During the years ended December 31, 2012 and 2011, we acquired the 24 operating office properties listed below from unrelated third parties. Unless otherwise noted, we funded these acquisitions with proceeds from the Company's public offerings of common stock (see Note 10), borrowings under the unsecured line of credit (see Note 7), disposition proceeds (see Note 17), the assumption of existing debt and the issuance of common units of the Operating Partnership.

Property	Acquisition	Number of Buildings	Rentable Square Feet (unaudited)	Occupancy as of December 31, 2012 (unaudited)	Purchase Price (in millions) (1)
2012 Acquisitions
4100-4700 Bohannon Drive, Menlo Park, CA	February 29, 2012	7	374,139	84.7%	$	162.5
701 and 801 N. 34th Street, Seattle, WA (3)	June 1, 2012	2	308,407	99.4%	105.4
837 N. 34th Street, Seattle, WA	June 1, 2012	1	111,580	100.0%	39.2
10900 NE 4th Street, Bellevue, WA (2)(4)	July 24, 2012	1	416,755	90.5%	186.1
6255 W. Sunset Boulevard, Los Angeles, CA (5)	July 31, 2012	1	321,883	85.2%	78.8
12233 Olympic Blvd, Los Angeles, CA (6)	October 5, 2012	1	151,029	96.8%	72.9
599 N. Mathilda Avenue, Sunnyvale, CA (2)(7)	December 17, 2012	1	75,810	100.0%	29.1
Total		14	1,759,603		$	674.0
2011 Acquisitions
250 Brannan Street, San Francisco, CA	January 28, 2011	1	92,948	100.0%	$	33.0
10210, 10220, and 10230 NE Points Drive; 3933 Lake Washington Boulevard NE, Kirkland, WA (8)	April 21, 2011	4	279,924	90.0%	100.1
10770 Wateridge Circle, San Diego, CA	May 12, 2011	1	174,310	97.5%	32.7
601 108th Avenue N.E., Bellevue, WA	June 3, 2011	1	488,470	90.4%	215.0
4040 Civic Center Drive, San Rafael, CA	June 9, 2011	1	126,787	98.1%	32.2
201 Third Street, San Francisco, CA	September 15, 2011	1	332,076	99.5%	103.3
301 Brannan Street, San Francisco, CA	November 15, 2011	1	74,430	100.0%	30.0
Total		10	1,568,945		$	546.3

________________________

(1) Excludes acquisition-related costs and non-lease related accrued liabilities assumed. Includes assumed unpaid leasing commissions and tenant improvements.

(2) As of December 31, 2012, these properties were temporarily being held in separate VIEs to facilitate potential Section 1031 Exchanges (see Note 2). The VIE was terminated subsequent to year-end.

(3) We acquired these properties through the acquisition of the ownership interest of the bankruptcy remote LLC that owned the properties. In connection with this acquisition we also acquired cash of approximately $4.0 million and other assets of approximately $0.2 million and we assumed current liabilities of approximately $0.6 million and secured debt with an outstanding principal balance of $34.0 million and a premium of $1.7 million as a result of recording the debt at fair value at the acquisition date (see Note 7).

(4) In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $83.6 million and a premium of $1.4 million as a result of recording

this debt at fair value on the acquisition date. In January 2013, we repaid this loan prior to the stated maturity (see Note 7).

(5) As part of the consideration for this transaction, we issued 118,372 common units of the Operating Partnership valued at $47.34 per unit, which was the Company's closing

stock price on the NYSE on the acquisition date. In connection with this acquisition we also assumed secured debt with an outstanding principal balance of $53.9 million and a

premium of $3.1 million as a result of recording this debt at fair value on the acquisition date (see Note 7). We also assumed $4.7 million of accrued liabilities in connection

with this acquisition that are not included in the purchase price above.

(6) In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $40.7 million and a premium of $2.7 million as a result of recording this debt at fair value on the acquisition date (see Note 7).

(7) This operating property was acquired in connection with the purchase of the 555 N. Mathilda Ave. development property discussed in further detail in the "Development and Redevelopment Project Site" section of this footnote, for a total purchase price of $137.6 million. The acquisition of both the operating property and the development site in a single transaction constituted our third largest acquisition of 2012.

(8) In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $30.0 million and an initial premium of $1.0 million as a result of recording this debt at fair value on the acquisition date (see Note 7).

The related assets, liabilities, and results of operations of the acquired properties are included in the consolidated financial statements as of the date of acquisition. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the respective acquisition dates for our 2012 and 2011 acquisitions:

F - 24

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

2012 Acquisitions
	4100-4700 Bohannon Drive, Menlo Park, CA		10900 NE 4th Street, Bellevue, WA		599 N. Mathilda, Sunnyvale, CA		All Other Acquisitions (1)		Total
	(in thousands)
Assets
Land and improvements(2)	$	38,810	$	25,080	$	13,538	$	40,211	$	117,639
Buildings and improvements (3)	124,617		150,877		12,558		257,458		545,510
Cash and cash equivalents	—		—		—		3,973		3,973
Restricted cash	—		—		—		5,329		5,329
Deferred leasing costs and acquisition-related intangible assets (4)	9,470		16,469		3,004		30,570		59,513
Prepaid expenses and other assets	—		—		—		184		184
Total assets acquired	172,897		192,426		29,100		337,725		732,148
Liabilities
Deferred revenue and acquisition-related intangible liabilities (5)	10,380		4,940		—		19,700		35,020
Secured debt, net (6)	—		84,984		—		136,048		221,032
Accounts payable, accrued expenses and other liabilities	137		627		—		5,584		6,348
Total liabilities assumed	10,517		90,551		—		161,332		262,400
Net assets and liabilities acquired (7)	$	162,380	$	101,875	$	29,100	$	176,393	$	469,748

2011 Acquisitions
	601 108th Avenue N.E., Bellevue, WA		201 Third Street San Francisco, CA		All Other Acquisitions (1)		Total
	(in thousands)
Assets
Land and improvements (2)	$	—	$	19,260	$	42,650	$	61,910
Buildings and improvements (3)	214,095		84,018		165,995		464,108
Undeveloped land and construction in progress	—		—		2,560		2,560
Deferred leasing costs and acquisition-related intangible assets(8)	13,790		8,700		20,140		42,630
Total assets acquired	227,885		111,978		231,345		571,208
Liabilities
Deferred revenue and acquisition-related intangible liabilities(9)	12,850		8,700		2,390		23,940
Secured debt, net (10)	—		—		30,997		30,997
Accounts payable, accrued expenses, and other liabilities	2,380		76		2,059		4,515
Total liabilities assumed	15,230		8,776		35,446		59,452
Net assets and liabilities acquired (11)	$	212,655	$	103,202	$	195,899	$	511,756

________________________

(1) The purchase price of all other acquisitions during the years ended December 31, 2012 and 2011 were individually less than 5% and in aggregate less than 10% of the Company's total assets as of December 31, 2012 and 2011, respectively.

(2) In connection with the acquisitions of 701, 801, and 837 N. 34th Street, Seattle, WA, we assumed the lessee obligations under a ground lease with an initial expiration in December 2041. The ground lease obligation contains three10-year extension options and one45-year extension option. In connection with the acquisitions of 601 108th Avenue N.E., Bellevue, WA, we assumed the lessee obligation under a ground lease that is scheduled to expire in November 2093 (see Note 15 for additional information pertaining to these ground leases).

(3) Represents buildings, building improvements, and tenant improvements.

(4) Represents in-place leases (approximately $43.4 million with a weighted average amortization period of 4.7 years), above-market leases (approximately $1.4 million with a weighted average amortization period of 3.8 years), leasing commissions (approximately $14.2 million with a weighted average amortization period of 3.4 years), and a below-market ground lease obligation (approximately $0.5 million with a weighted average amortization period of 59.6 years).

(5) Represents below-market leases (approximately $33.9 million with a weighted average amortization period of 6.5 years) and an above-market ground lease obligation (approximately $1.1 million with a weighted average amortization period of 29.6 years).

(6) Represents the fair value of the mortgage loans assumed, which includes an aggregate unamortized premium balance of approximately $8.9 million at the dates of acquisition (see Note 7).

(7) Reflects the purchase price plus cash and restricted cash received, net of assumed secured debt, lease-related obligations and other accrued liabilities.

(8) Represents in-place leases (approximately $27.4 million with a weighted average amortization period of 3.8 years), above-market leases (approximately $6.8 million with a weighted average amortization period of 4.5 years years) and unamortized leasing commissions (approximately $8.5 million with a weighted average amortization period of 2.5 years).

(9) Represents below-market leases (approximately $18.7 million with a weighted average amortization period of 3.9 years) and an above-market ground lease obligation (approximately $5.2 million with a weighted average amortization period of 82.5 years), under which we are the lessee.

(10) Represents the mortgage loan, which includes an unamortized premium of approximately $1.0 million at the date of acquisition, assumed in connection with the properties acquired in April 2011 (see Note 7).

(11) Reflects the purchase price net of assumed secured debt and other lease-related obligations.

F - 25

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Development and Redevelopment Project Sites

During the years ended December 31, 2012 and 2011, we acquired seven development and redevelopment project sites from unrelated third parties. Unless otherwise noted, we funded these acquisitions with proceeds from the Company's public offering of common stock (see Note 10), disposition proceeds (see Note 17) and borrowings under the unsecured line of credit (see Note 7).

Project	Date of Acquisition	Type	Purchase Price (in millions) (1)
2012 Acquisitions
690 E. Middlefield Road, Mountain View, CA (2)(3)	May 9, 2012	Development	$	74.5
333 Brannan Street, San Francisco, CA	July 20, 2012	Development	18.5
Columbia Square, Los Angeles, CA (4)	September 28, 2012	Development and Redevelopment	65.0
350 Mission Street, San Francisco, CA	October 23, 2012	Development	52.0
331 Fairchild Drive, Mountain View, CA (2)(5)	December 4, 2012	Development	21.8
555 N. Mathilda Avenue, Sunnyvale, CA (2)(6)(7)	December 17, 2012	Development	108.5
Total			$	340.3
2011 Acquisitions
360 Third Street, San Francisco, CA	December 15, 2011	Redevelopment	$	91.5
Total			$	91.5

________________________

(1) Excludes leasing costs and/or other accrued liabilities assumed in connection with the acquisitions.

(2) Acquisition of these development sites are accounted for as business combinations because the projects were 100% pre-leased upon acquisition.

(3) The total purchase price for this acquisition was comprised of a cash purchase price of $74.5 million plus $9.5 million of assumed leasing commissions and other accrued liabilities.

(4) In connection with this acquisition we also assumed $1.1 million of other accrued liabilities which are not included in the purchase price above.

(5) The total purchase price for this acquisition was comprised of a cash purchase price of $18.9 million plus $2.9 million of development costs reimbursed to the seller. In addition, we assumed $2.1 million of leasing commissions and other accrued liabilities which are not included in the purchase price above.

(6) As of December 31, 2012, this property was temporarily being held in a separate VIE to facilitate a potential Section 1031 Exchange (see Note 2). The VIE was terminated subsequent to year-end.

(7) This development site was acquired with the purchase of the 555 Mathilda operating property for a total cash purchase price of $137.6 million plus $2.4 million of development costs reimbursed to the seller. In addition, we assumed $11.8 million of other accrued liabilities which are not included in the purchase price above.

The related assets and liabilities of the acquired projects are included in the consolidated financial statements as of the date of acquisition. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the respective acquisition dates for our 2012 and 2011 development and redevelopment acquisitions:

2012 Acquisitions
	555 N. Mathilda, Sunnyvale, CA		All Other Acquisitions		Total
	(in thousands)
Assets
Undeveloped land and construction in progress	$	120,243	$	244,584	$	364,827
Restricted cash (1)	11,250		—		11,250
Prepaid expenses and other assets	—		1,300		1,300
Total assets acquired	131,493		245,884		377,377
Liabilities
Accounts payable, accrued expenses and other liabilities (1)	23,071		9,752		32,823
Total liabilities assumed	23,071		9,752		32,823
Net assets and liabilities acquired (2)	$	108,422	$	236,132	$	344,554

F - 26

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

2011 Acquisition
	360 Third Street, San Francisco, CA
	(in thousands)
Assets
Undeveloped land and construction in progress (3)	$	89,345
Deferred leasing costs and acquisition-related intangible assets	2,930
Total assets acquired	92,275
Liabilities
Deferred revenue and acquisition-related intangible liabilities	730
Total liabilities assumed	730
Net assets and liabilities acquired	$	91,545

________________________

(1) In connection with this acquisition, restricted cash is being held in escrow to pay for potential environmental costs and contingent development costs. Any unused amounts will be released to the seller.

(2) Reflects the purchase price including assumed leasing commissions, net of assumed accrued liabilities.

(3) In connection with this acquisition we assumed the lessee obligation under a ground lease that is scheduled to expire in December 2022. We exercised the $27.5 million land purchase option, which was not included in the purchase price, during 2012 and anticipate we will close on the purchase of the land during the second quarter of 2013 (see Note 15 for additional information pertaining to this ground lease).

4. Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net

The following table summarizes our deferred leasing costs and acquisition-related intangible assets (acquired value of leasing costs, above-market operating leases, in-place leases and below-market ground lease obligation) and intangible liabilities (acquired value of below-market operating leases and above-market ground lease obligation) as of December 31, 2012 and 2011:

	December 31,
	2012			2011
	(in thousands)
Deferred Leasing Costs and Acquisition-related Intangible Assets, net:
Deferred leasing costs	$	168,087		$	142,652
Accumulated amortization	(61,443		)	(52,974		)
Deferred leasing costs, net	106,644			89,678
Above-market operating leases	27,977			28,143
Accumulated amortization	(12,180		)	(8,101		)
Above-market operating leases, net	15,797			20,042
In-place leases	101,061			61,355
Accumulated amortization	(34,019		)	(15,753		)
In-place leases, net	67,042			45,602
Below-market ground lease obligation	690			200
Accumulated amortization	(205		)	—
Below-market ground lease obligation, net	485			200
Total deferred leasing costs and acquisition-related intangible assets, net	$	189,968		$	155,522
Acquisition-related Intangible Liabilities, net(1):
Below-market operating leases	$	70,486		$	37,582
Accumulated amortization	(17,555		)	(6,158		)
Below-market operating leases, net	52,931			31,424
Above-market ground lease obligation	6,320			5,200
Accumulated amortization	(122		)	(37		)
Above-market ground lease obligation, net	6,198			5,163
Total acquisition-related intangible liabilities, net	$	59,129		$	36,587

________________________

F - 27

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(1) Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets.

The following table sets forth amortization related to deferred leasing costs and acquisition-related intangibles for the years ended December 31, 2012, 2011 and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Deferred leasing costs (1)	$	20,804		$	16,905		$	13,344
Above-market operating leases (2)	5,695			5,946			2,163
In-place leases (1)	21,976			12,575			3,266
Below-market ground lease obligation (3)	205			—			—
Below-market operating leases (4)	(12,393		)	(4,890		)	(786		)
Above-market ground lease obligation (5)	(85		)	(37		)	—
Total	$	36,202		$	30,499		$	17,987

_________________________

(1) The amortization of deferred leasing costs and in-place leases is recorded to depreciation and amortization expense in the consolidated statements of operations for the periods

presented.

(2) The amortization of above-market operating leases is recorded as a decrease to rental income in the consolidated statements of operations for the periods presented.

(3) The amortization of the below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented.

(4) The amortization of below−market operating leases is recorded as an increase to rental income in the consolidated statements of operations for the periods presented.

(5) The amortization of the above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented.

The following table sets forth the estimated annual amortization expense related to deferred leasing costs and acquisition-related intangibles as of December 31, 2012 for future periods:

Year Ending	Deferred Leasing Costs		Above-Market Operating Leases (1)		In-Place Leases		Below-Market Ground Lease Obligation (2)		Below-Market Operating Leases (3)			Above-Market Ground Lease Obligation (4)
	(in thousands)
2013	$	22,676	$	5,316	$	23,298	$	8	$	(13,140	)	$	(101	)
2014	20,235		4,336		15,567		8		(11,360		)	(101		)
2015	16,377		2,533		9,913		8		(8,828		)	(101		)
2016	13,757		1,506		6,798		8		(6,645		)	(101		)
2017	11,421		1,185		5,417		8		(5,577		)	(101		)
Thereafter	22,178		921		6,049		445		(7,381		)	(5,693		)
Total	$	106,644	$	15,797	$	67,042	$	485	$	(52,931	)	$	(6,198	)

_______________________

(1) Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations.

(2) Represents estimated annual amortization related to below−market ground lease obligations. Amounts will be recorded as an increase to ground lease expense in the consolidated statements of operations.

(3) Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations.

(4) Represents estimated annual amortization related to above−market ground lease obligations. Amounts will be recorded as a decrease to ground lease expense in the consolidated statements of operations.

5. Receivables

Current Receivables, net

Current receivables, net is primarily comprised of contractual rents and other lease-related obligations due from tenants. The balance consisted of the following as of December 31, 2012 and 2011:

F - 28

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

	December 31,
	2012			2011
	(in thousands)
Current receivables	$	11,801		$	10,985
Allowance for uncollectible tenant receivables	(2,581		)	(2,590		)
Current receivables, net	$	9,220		$	8,395

Deferred Rent Receivables, net

Deferred rent receivables, net consisted of the following as of December 31, 2012 and 2011:

	December 31,
	2012			2011
	(in thousands)
Deferred rent receivables	$	118,025		$	104,548
Allowance for deferred rent receivables	(2,607		)	(3,406		)
Total deferred rent receivables, net	$	115,418		$	101,142

F - 29

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

6.    Secured and Unsecured Debt of the Company

In this Note 6, the "Company" refers solely to Kilroy Realty Corporation and not to any of our subsidiaries. The Company itself does not hold any indebtedness. All of our secured and unsecured debt is held directly by the Operating Partnership.

The Company generally guarantees all the Operating Partnership's unsecured debt obligations including the unsecured revolving credit facility, the $150.0 million unsecured term loan facility, 6.625% unsecured senior notes due 2020, the 4.80% unsecured senior notes due 2018, the 5.00% unsecured senior notes due 2015, the 6.45% unsecured senior notes due 2014, and the 4.25% Exchangeable Notes. As of both December 31, 2012 and 2011, the Operating Partnership had $1.5 billion outstanding in total under these unsecured debt obligations.

In addition, although the remaining $0.6 billion and $0.4 billion of the Operating Partnership's debt for December 31, 2012 and 2011, respectively, is secured and non-recourse to the Company, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities.

The Company and the Operating Partnership are both named parties to the capped call option transactions discussed further in Note 7.

Debt Covenants and Restrictions

One of the covenants contained within the credit facility and the term loan facility, as discussed further below in Note 7 prohibits the Company from paying dividends in excess of 95% of funds from operations ("FFO").

7.    Secured and Unsecured Debt of the Operating Partnership

Secured Debt

The following table sets forth the composition of our secured debt as of December 31, 2012 and 2011:

	Annual Stated	GAAP		December 31,
Type of Debt	Interest Rate (1)	Effective Rate (1)(2)	Maturity Date	2012 (11)		2011 (11)
				(in thousands)
Mortgage note payable	4.27%	4.27%	February 2018	$	135,000	$	135,000
Mortgage note payable (3)(9)	4.48%	4.48%	July 2027	97,000		—
Mortgage note payable (4)(9)	6.37%	3.55%	April 2013	83,116		—
Mortgage note payable (5)	5.57%	5.57%	August 2012	—		71,517
Mortgage note payable	6.51%	6.51%	February 2017	68,615		69,507
Mortgage note payable (6)(9)	5.23%	3.50%	January 2016	56,302		—
Mortgage note payable (7)(9)	5.57%	3.25%	February 2016	43,016		—
Mortgage note payable (8)(9)	5.09%	3.50%	August 2015	35,379		—
Mortgage note payable (9)	4.94%	4.00%	April 2015	28,941		30,191
Mortgage note payable (5)	4.95%	4.95%	August 2012	—		29,754
Mortgage note payable	7.15%	7.15%	May 2017	11,210		13,294
Public facility bonds (10)	Various	Various	Various	2,517		2,562
Total				$	561,096	$	351,825

_______________________

(1) All interest rates presented are fixed-rate interest rates.

(2) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of discounts/premiums, excluding debt issuance costs.

(3) In June 2012, we obtained a mortgage loan that is secured by one office property located in Irvine, California and two office properties located in Los Angeles, California and requires monthly principal and interest payments based on a 30 year amortization period with an initial 3 years of interest only payments.

(4) In July 2012, in connection with the acquisition of one office building in Bellevue, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $83.6 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $1.4 million. The loan requires monthly principal and interest payments based on a 30 year amortization period. In January 2013, we repaid this loan prior to the stated maturity.

(5) In May 2012, we repaid these loans prior to the stated maturity.

(6) In July 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage had a principal balance of $53.9 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $3.1 million. The loan requires monthly principal and interest payments based on a 30 year amortization period.

(7) In October 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $40.7 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium of

approximately $2.7 million.

(8) In June 2012, in connection with the acquisition of two office buildings in Seattle, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $34.0 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium of

F - 30

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

approximately $1.7 million.

(9) The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.

(10) The public facility bonds (the “Bonds”), the proceeds from which were used to finance infrastructure improvements on one of the Company’s undeveloped land parcels, were issued in February 2008 by the City of Carlsbad. The Bonds have annual maturities from September 1, 2013 through September 1, 2038, with interest rates ranging from 4.74% to 6.20%. Principal and interest payments for the Bonds will be charged through the assessment of special property taxes.

(11) Amounts reported include the amounts of unamortized debt premiums and discounts for the periods presented.

The Operating Partnership’s secured debt was collateralized by 20 operating properties as of December 31, 2012 with a combined net book value of $1.0 billion and 18 operating properties at December 31, 2011 with a combined net book value of $567.8 million.

Although our mortgage loans are secured and non-recourse to the Company and the Operating Partnership, the Company

provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments,

and environmental liabilities.

As of December 31, 2012, nine of the Operating Partnership's ten secured loans contained restrictions that would require the payment of prepayment penalties for the acceleration of outstanding debt. The mortgage notes payable are secured by deeds of trust on certain of our properties and the assignment of certain rents and leases associated with those properties. The Bonds are secured by property tax payments.

Exchangeable Senior Notes

The following table summarizes the balance and significant terms of the Company's 3.25% Exchangeable Notes due April 2012 (the "3.25% Exchangeable Notes") and 4.25% Exchangeable Notes due November 2014 (the "4.25% Exchangeable Notes" and together with the 3.25% Exchangeable Notes, the "Exchangeable Notes") outstanding as of December 31, 2012 and 2011. The Company repaid the 3.25% Exchangeable Notes in April 2012 upon maturity.

	3.25% Exchangeable Notes					4.25% Exchangeable Notes
	December 31, 2012		December 31, 2011			December 31, 2012			December 31, 2011
	(in thousands)
Principal amount	$	—	$	148,000		$	172,500		$	172,500
Unamortized discount	—		(924		)	(8,556		)	(12,684		)
Net carrying amount of liability component	$	—	$	147,076		$	163,944		$	159,816
Carrying amount of equity component			$33,675			$19,835
Issuance date			April 2007			November 2009
Maturity date			April 2012			November 2014
Stated coupon rate (1)			3.25%			4.25%
Effective interest rate (2)			5.45%			7.13%
Exchange rate per $1,000 principal value of the Exchangeable Notes, as adjusted (3)						27.8307
Exchange price, as adjusted (3)						$35.93
Number of shares on which the aggregate consideration to be delivered on conversion is determined (3)						4,800,796

_______________

(1) Interest on the 4.25% Exchangeable Notes is payable semi-annually in arrears on May 15th and November 15th of each year.

(2) The rate at which we record interest expense for financial reporting purposes, which reflects the amortization of the discounts on the Exchangeable Notes (see Note 2). This rate represents our conventional debt borrowing rate at the date of issuance.

(3) The exchange rate, exchange price, and the number of shares to be delivered upon conversion are subject to adjustment under certain circumstances including increases in our common dividends.  

The 4.25% Exchangeable Notes are exchangeable for shares of the Company’s common stock prior to maturity only upon the occurrence of certain events as follows: (i) during any calendar quarter, if the closing sale price per share of the common stock of the Company is more than 130% of the exchange price per share of the Company’s common stock for at least 20 trading days in a specified period, (ii) during the five consecutive trading-day period following any five consecutive trading days in which the trading price per $1,000 principal amount of the Exchangeable Notes was less than 98% of the product of the closing sale price per share of the Company’s common stock multiplied by the applicable exchange rate, (iii) if the Exchangeable Notes have been called for redemption, (iv) upon the occurrence of specified corporate transactions, (v) if the Company’s common stock ceases to be listed or approved for quotation for 30 consecutive trading days, or (vi) on or after August 15, 2014.

Upon exchange, the holders of the 4.25% Exchangeable Notes will receive (i) cash up to the principal amount of the Exchangeable Notes and (ii) to the extent the exchange value exceeds the principal amount of the 4.25% Exchangeable Notes,

F - 31

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

shares of the Company’s common stock. At any time prior to August 15, 2014, the Operating Partnership may irrevocably elect, in its sole discretion without the consent of the holders of the 4.25% Exchangeable Notes, to settle all of the future exchange obligations of the 4.25% Exchangeable Notes in shares of common stock. Any shares of common stock delivered for settlement will be based on a daily exchange value calculated on a proportionate basis for each day of a 30 trading-day observation period.

During the third quarter of 2012, the closing sale price per share of the common stock of the Company was more than 130% of the exchange price per share of the Company’s common stock for at least 20 trading days in the specified period. As a result, for the three months ended December 31, 2012, the 4.25% Exchangeable Notes were exchangeable at the exchange rate stated above, however no holders exchanged any of the 4.25% Exchangeable Notes during this period. The 4.25% Exchangeable notes may again be exchangeable if one or more of the events were again to occur during future measurement periods.

For the years ended December 31, 2012 and December 31, 2011, the per share average trading price of the Company's common stock on the NYSE was higher than the $35.93 exchange price for the 4.25% Exchangeable Notes, as presented below:

	Year Ended December 31,
	2012	2011
Per share average trading price of the Company's common stock	$45.72	$37.27

The average trading price of the Company's common stock on the NYSE was below the exchange price for the 4.25% Exchangeable Notes during year ended December 31, 2010 and below the exchange price for the 3.25% Exchangeable Notes, which were repaid in April 2012, during the years ended December 31, 2011 and 2010. See Notes 19 and 20 for a discussion of the impact of the Exchangeable Notes on our diluted earnings per share and unit calculations for the periods presented.

Using the per share average trading price presented in the table above, the approximate fair value of the shares upon conversion of the 4.25% Exchangeable Notes as of December 31, 2012 and December 31, 2011 would have been as follows:

	December 31, 2012 (1)		December 31, 2011 (2)
	(in thousands)
Approximate fair value of shares upon conversion	$	221,200	$	179,100
Principal amount of 4.25% Exchangeable Notes	172,500		172,500
Approximate fair value in excess amount of principal amount	$	48,700	$	6,600

_______________

(1) Although the 4.25% Exchangeable Notes were exchangeable during the three months ended December 31, 2012, no 4.25% Exchangeable Notes were exchanged during the period. The 4.25% Exchangeable Notes were not exchangeable during the remainder of the year.

(2) The 4.25% Exchangeable Notes were not exchangeable during the year ended December 31, 2011.

Exchangeable Note Tender Offer and Note Repurchases

In June 2010, we repurchased 3.25% Exchangeable Notes with an aggregate stated principal amount of $150.0 million for approximately $151.1 million in cash, including transaction costs, pursuant to a tender offer. As a result of the transaction, we recorded a net loss on early extinguishment of debt of approximately $4.6 million and charged approximately $2.7 million, representing the amount of the cash repurchase proceeds allocated to the equity component, to additional paid-in capital.

Interest Expense for the Exchangeable Notes

The unamortized discount on the Exchangeable Notes is accreted as additional interest expense from the date of issuance through the maturity date of the applicable Exchangeable Notes. The following table summarizes the total interest expense attributable to the Exchangeable Notes based on the effective interest rates set forth above, before the effect of capitalized interest, for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Contractual interest payments	$	8,721	$	12,141	$	14,565
Amortization of discount	5,052		6,928		7,965
Interest expense attributable to Exchangeable Notes	$	13,773	$	19,069	$	22,530

F - 32

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Capped Call Transactions

In connection with the offerings of the Exchangeable Notes, we entered into capped call option transactions ("capped calls") to mitigate the dilutive impact of the potential conversion of the Exchangeable Notes. The capped calls, as amended, are separate transactions entered into by us with the relevant financial institutions, are not part of the terms of the Exchangeable Notes, and do not affect the holders’ rights under the Exchangeable Notes. The strike prices of the capped calls, which are subject to customary anti-dilution adjustments, correspond to the exchange prices of the applicable Exchangeable Notes.

The capped calls for the 3.25% Exchangeable Notes, which referenced a total of 1,121,201 shares of common stock with an exchange price of $102.72 at December 31, 2011, were terminated when the 3.25% Exchangeable Notes were repaid in April 2012. The table below summarizes our capped call option positions for the 4.25% Exchangeable Notes as of both December 31, 2012 and 2011:

	4.25% Exchangeable Notes (1)
Referenced shares of common stock	4,800,796
Exchange price including effect of capped calls	$42.81

________________________

(1) The capped calls mitigate the dilutive impact to us of the potential exchange of all of the 4.25% Exchangeable Notes into shares of common stock.

The capped calls are expected to terminate upon the earlier of the maturity date of the 4.25% Exchangeable Notes or upon the date upon which the 4.25% Exchangeable Notes are no longer outstanding resulting from an exchange or repurchase by us. The initial cost of capped calls were recorded as a reduction to additional paid-in capital.

Unsecured Senior Notes

The following table summarizes the balance and significant terms of the registered unsecured senior notes issued by the Operating Partnership as of December 31, 2012 and 2011:

	4.800% Unsecured Senior Notes						6.625% Unsecured Senior Notes						5.000% Unsecured Senior Notes
	December 31, 2012			December 31, 2011			December 31, 2012			December 31, 2011			December 31, 2012			December 31, 2011
	(in thousands)
Principal amount	$	325,000		$	325,000		$	250,000		$	250,000		$	325,000		$	325,000
Unamortized discount	(413		)	(486		)	(1,580		)	(1,793		)	(112		)	(152		)
Net carrying amount	$	324,587		$	324,514		$	248,420		$	248,207		$	324,888		$	324,848
Issuance date	July 2011						May 2010						November 2010
Maturity date	July 2018						June 2020						November 2015
Stated coupon rate (1)(2)(3)	4.800%						6.625%						5.000%
Effective interest rate (4)	4.827%						6.743%						5.014%

________________________

(1) Interest on the 4.800% unsecured senior notes is payable semi-annually in arrears on January 15th and July 15th of each year.

(2) Interest on the 6.625% unsecured senior notes is payable semi-annually in arrears on June 1st and December 1st of each year.

(3) Interest on the 5.000% unsecured senior notes is payable semi-annually in arrears on May 3rd and November 3rd of each year.

(4) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of initial issuance discounts, excluding debt issuance costs.

In 2011, we used a portion of the net proceeds from the 4.800% unsecured senior note offering for general corporate purposes, including the repayment of borrowings under our revolving credit facility and to fund operating property acquisitions. In 2010, we used the net proceeds from the 6.625% and 5.000% unsecured senior note offerings to fund operating property acquisitions and to repurchase $150.0 million in aggregate principal balance of the 3.25% Exchangeable Notes.

In addition to the registered unsecured senior note issuances listed above, we also had outstanding Series B unsecured senior notes with an aggregate principal balance of $83.0 million and effective interest rate of 6.45% as of December 31, 2012 and 2011, that mature in August 2014. The Series B notes require semi-annual interest payment each February and August based on a fixed annual interest rate of 6.45%.

F - 33

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Term Loan Facility

In March 2012, the Operating Partnership entered into a $150.0 million term loan facility, which is included in unsecured debt, net on our consolidated balance sheets. The term loan facility bears interest at an annual rate of LIBOR plus 1.750%, which can vary depending on the Operating Partnership's credit rating, and is scheduled to mature on March 29, 2016. Under the terms of the term loan facility, we may exercise an option to extend the maturity date by one year. We may elect to borrow up to an additional $100.0 million under an accordion option, subject to bank approval. We used the borrowings under the term loan facility to repay the 3.25% Exchangeable Notes in April 2012 upon maturity.

Unsecured Revolving Credit Facility

In August 2010 we entered into our current $500.0 million revolving credit facility and used the borrowings under the revolving credit facility to repay and then terminate our prior $550.0 million unsecured revolving credit facility. In March 2012, we amended the revolving credit facility to reduce the FMV Cap Rate (as defined in the revolving credit facility agreement), which is used to calculate the fair value of our assets for certain covenants under the revolving credit facility, from 7.50% to 6.75%. There were no other changes to the terms of the revolving credit facility in connection with this amendment. In November 2012 and June 2011, we amended and restated our revolving credit facility to extend the maturity date and reduce the interest rate and facility fee. The following table summarizes the terms of our revolving credit facility as of December 31, 2012 and December 31, 2011:

	December 31, 2012			December 31, 2011
	(in thousands)
Outstanding borrowings	$	185,000		$	182,000
Remaining borrowing capacity	315,000			318,000
Total borrowing capacity (1)	$	500,000		$	500,000
Interest rate (2)	1.66		%	2.05		%
Facility fee-annual rate (3)	0.300		%	0.350		%
Maturity date (4)	April 2017			August 2015

_______________________

(1) We may elect to borrow, subject to bank approval, up to an additional $200.0 million under an accordion feature under the terms of the revolving credit facility.

(2) The revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.450% and 1.750% as of December 31, 2012 and December 31, 2011, respectively.

(3) The facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we also incurred debt origination and legal costs of approximately $5.0 million when we entered into the revolving credit facility in 2010, an additional $3.3 million when we amended the terms of the revolving credit facility in June 2011 and an additional $1.9 million when we amended the terms of the revolving credit facility in November 2012. The unamortized balance of these costs are amortized through the extended maturity date of the revolving credit facility.

(4) Under the original and all amended terms of the revolving credit facility, we may exercise an option to extend the maturity date by one year.

The Company intends to borrow amounts under the revolving credit facility from time to time for general corporate purposes, to fund potential acquisitions, to finance development and redevelopment expenditures, and to potentially repay long-term debt.

Debt Covenants and Restrictions

The revolving credit facility, the unsecured senior notes, the term loan facility, and certain other secured debt arrangements contain covenants and restrictions requiring us to meet certain financial ratios and reporting requirements. Some of the more restrictive financial covenants include a maximum ratio of total debt to total asset value, a minimum fixed-charge coverage ratio, a minimum unsecured debt ratio, and a minimum unencumbered asset pool debt service coverage ratio. Noncompliance with one or more of the covenants and restrictions could result in the full or partial principal balance of the associated debt becoming immediately due and payable. We believe we were in compliance with all of our debt covenants as of December 31, 2012 and 2011.

F - 34

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Debt Maturities

The following table summarizes the stated debt maturities and scheduled amortization payments, excluding debt discounts and premiums, as of December 31, 2012:

Year Ending	(in thousands)
2013	$	90,881
2014	263,913
2015	393,711
2016	247,822
2017	255,036
Thereafter	793,056
Total	$	2,044,419	(1)

_______________________

(1) Includes gross principal balance of outstanding debt before impact of all debt discounts and premiums.

Capitalized Interest and Loan Fees

The following table sets forth our gross interest expense reported in continuing operations, including debt discount/premium and loan cost amortization, net of capitalized interest, for the years ended December 31, 2012, 2011 and 2010. The interest expense capitalized was recorded as a cost of development and redevelopment, and increased the carrying value of undeveloped land and construction in progress. (See Note 17 for interest expense reported in discontinued operations).

	Year Ended December 31,
	2012			2011			2010 (1)
	(in thousands)
Gross interest expense	$	98,906		$	94,915		$	69,661
Capitalized interest	(19,792		)	(9,130		)	(10,015		)
Interest expense	$	79,114		$	85,785		$	59,646

_______________________

(1) Interest expense for the year ended December 31, 2010 includes loss on extinguishment of debt.

F - 35

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

8. Deferred Revenue and Acquisition Related Liabilities, net

Deferred revenue and acquisition-related liabilities, net consisted of the following at December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Deferred revenue related to tenant-funded tenant improvements	$	56,461	$	41,884
Other deferred revenue	2,314		1,310
Acquisition-related intangible liabilities, net (1)	59,129		36,587
Total	$	117,904	$	79,781

________________________

(1) See Note 4 for additional information.

Deferred Revenue Related to Tenant-funded Tenant Improvements

During the years ended December 31, 2012, 2011, and 2010, $9.1 million, $9.3 million, and $9.7 million, respectively, of deferred revenue related to tenant-funded tenant improvements (including discontinued operations) was amortized and recognized as rental income. The following is the estimated amortization of deferred revenue related to tenant-funded tenant improvements as of December 31, 2012 for the next five years and thereafter:

Year Ending	(in thousands)
2013	$	10,054
2014	9,339
2015	8,255
2016	7,825
2017	6,409
Thereafter	14,579
Total	$	56,461

9. Noncontrolling Interests on the Company's Consolidated Financial Statements

7.45% Series A Cumulative Redeemable Preferred Units of the Operating Partnership

On August 15, 2012 (the "Series A Redemption Date"), the Operating Partnership redeemed all 1,500,000 outstanding 7.45% Series A Cumulative Redeemable Preferred Units representing preferred limited partnership interests in the Operating Partnership ("Series A Preferred Units"). On the Series A Redemption Date, the Series A Preferred Units were redeemed at a redemption price equal to $50.00 per unit, representing $75.0 million in aggregate, plus all accrued and unpaid distributions to the Series A Redemption Date.

During the year ended December 31, 2012, we recognized a non-recurring non-cash charge of $2.1 million as a reduction to net income available to common stockholders for the original issuance costs related to the Series A Preferred Units.

As of December 31, 2011, all 1,500,000 Series A Preferred units were outstanding and the accrued distribution payable to holders of Series A Preferred Units, which was included in the Series A Preferred Units noncontrolling interest on the balance sheet, was $0.7 million.

Common Units of the Operating Partnership

The Company owned a 97.6% and 97.2% common general partnership interest in the Operating Partnership as of December 31, 2012 and 2011, respectively. The remaining 2.4% and 2.8% common limited partnership interest as of December 31, 2012 and 2011, respectively, was owned by non-affiliate investors and certain of our executive officers and directors in the form of noncontrolling common units. There were 1,826,503 and 1,718,131 common units outstanding held by these investors, executive officers and directors as of December 31, 2012 and 2011, respectively. The increase in the common units from December 31, 2011 to December 31, 2012 was primarily attributable to 118,372 units issued in connection with an operating property acquisition (see Note 3).

The noncontrolling common units may be redeemed by unitholders for cash. We, at our option, may satisfy the cash redemption obligation with shares of the Company’s common stock on a one-for-one basis. Whether satisfied in cash or shares of the Company’s

F - 36

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

common stock, the value for each noncontrolling common unit upon redemption is the amount equal to the average of the closing quoted price per share of the Company’s common stock, par value $.01 per share, as reported on the NYSE for the ten trading days immediately preceding the applicable balance sheet date. The aggregate value upon redemption of the then-outstanding noncontrolling common units was $85.4 million and $64.7 million as of December 31, 2012 and 2011, respectively. This redemption value does not necessarily represent the amount that would be distributed with respect to each noncontrolling common unit in the event of our termination or liquidation. In the event of our termination or liquidation, it is expected in most cases that each common unit would be entitled to a liquidating distribution equal to the amount payable with respect to each share of the Company’s common stock.

10. Stockholders' Equity of the Company

Preferred Stock Issuances

6.375% Series H and 6.875% Series G Cumulative Redeemable Preferred Stock

In August 2012, the Company issued 4,000,000 shares of its 6.375% Series H Cumulative Redeemable Preferred Stock ("Series H Preferred Stock") at a public offering price of $25.00 per share, for a total of approximately $96.2 million of net proceeds, after deducting the underwriting discount and other offering-related costs. We used a portion of the net proceeds to redeem the Series A Preferred Units as discussed in Note 9 and the remaining portion for general corporate purposes. Dividends on the Series H Preferred Stock are cumulative and are payable quarterly in arrears on the 15th day of each February, May, August and November, commencing November 15, 2012. The Series H Preferred Stock is presented in stockholders' equity on the consolidated balance sheet net of issuance costs.

In March 2012, the Company issued 4,000,000 shares of its 6.875% Series G Cumulative Redeemable Preferred Stock ("Series G Preferred Stock") at a public offering price of $25.00 per share, for a total of approximately $96.2 million of net proceeds, after deducting the underwriting discount and other offering-related costs. We used the net proceeds to redeem the Series E Preferred and Series F Preferred Stock as discussed below. Dividends on the Series G Preferred Stock are cumulative and are payable quarterly in arrears on the 15th day of each February, May, August and November, commencing May 15, 2012. The Series G Preferred Stock is presented in stockholders' equity on the consolidated balance sheet net of issuance costs.

The outstanding shares of the Series G Preferred Stock and the Series H Preferred Stock do not have a stated maturity date and are not subject to any sinking fund or mandatory redemption. Upon liquidation, dissolution or winding up, the Series G Preferred Stock and the Series H Preferred Stock will rank senior to the Company's common stock with respect to the payment of distributions and other amounts. Holders of the Series G Preferred Stock and the Series H Preferred Stock generally have no voting rights except for limited voting rights if the Company fails to pay dividends for six or more quarterly dividend periods (whether or not consecutive). The Company may not redeem the Series G Preferred Stock prior to March 27, 2017 nor the Series H Preferred Stock prior to August 15, 2017, except in limited circumstances relating to the Company’s continuing qualification as a REIT and upon certain specified change in control transactions in which the Company’s shares of common stock and the acquiring or surviving entity common securities would not be listed on the NYSE, NYSE Amex or NASDAQ, or any successor exchanges. On or after March 27, 2017 or August 15, 2017, the Company may, at its option, redeem the Series G Preferred Stock or the Series H Preferred Stock, respectively, in whole or in part at any time or from time to time, by payment of $25.00 per share in cash, plus any accumulated, accrued and unpaid distributions through the date of redemption. Upon the occurrence of a specified change of control transaction, the Company may, at its option, redeem the Series G Preferred Stock or the Series H Preferred Stock in whole or in part within 120 days after the change of control occurred, by paying $25.00 per share in cash, plus any accrued and unpaid distributions through the date of redemption. If the Company does not exercise its right to redeem the Series G Preferred Stock or the Series H Preferred Stock upon the occurrence of a specified change of control transaction, the holders of Series G Preferred Stock and the Series H Preferred Stock have the right to convert some or all of their shares into a number of the Company’s shares of common stock based on a pre-determined formula subject to a maximum share cap of 4,390,000 shares of common stock for the Series G Preferred Stock and 4,187,600 shares of common stock for the Series H Preferred Stock.

Preferred Stock Redemption

7.80% Series E and 7.50% Series F Cumulative Redeemable Preferred Stock

On April 16, 2012 (the "Series E and F Redemption Date"), the Company redeemed all 1,610,000 outstanding shares of its 7.80% Series E Cumulative Redeemable Preferred Stock ("Series E Preferred Stock") and all 3,450,000 outstanding shares of its 7.50% Series F Cumulative Redeemable Preferred Stock ("Series F Preferred Stock"). On the Series E and F Redemption Date, the shares of Series E and Series F Preferred Stock (together, the “Redeemed Preferred Stock”) were redeemed at a redemption price equal to their stated liquidation preference of $25.00 per share, representing $126.5 million in aggregate, plus all accrued and unpaid dividends to the Series E and F Redemption Date. As of December 31, 2011, all 1,610,000 Series E Preferred Stock and all 3,450,000 Series F Preferred Stock were outstanding.

F - 37

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Three Years Ended December 31, 2012

During the year ended December 31, 2012, we recognized a non-recurring non-cash charge of $4.9 million as a reduction to net income available to common stockholders for the original issuance costs related to the Redeemed Preferred Stock.

Common Stock

Issuance of Common Stock

In August 2012, the Company completed an underwritten public offering of 5,750,000 shares of its common stock. The net offering proceeds, after deducting sales agent compensation and offering expenses, were approximately $253.8 million. We used a portion of the net proceeds from the offering to fund acquisitions, repay borrowings under the revolving credit facility, and for general corporate purposes.

In February 2012, the Company completed an underwritten public offering of 9,487,500 shares of its common stock. The net offering proceeds, after deducting sales agent compensation and offering expenses, were approximately $382.1 million. We used a portion of the net proceeds from the offering to fund acquisitions, repay borrowings under the revolving credit facility, and for general corporate purposes.

In April 2011, the Company completed an underwritten public offering of 6,037,500 shares of its common stock. The net offering proceeds, after deducting sales agent compensation and offering expenses, were approximately $221.0 million. We used a portion of the net proceeds from the offering to fund acquisitions and for general corporate purposes.

In April 2010, the Company completed an underwritten public offering of 9,200,000 shares of its common stock. The net offering proceeds, after deducting sales agent compensation and offering expenses, were approximately $299.8 million. We used a portion of the net proceeds from the offering to fund acquisitions, repay borrowings under the prior revolving credit facility, and for general corporate purposes.

At-The-Market Stock Offering Program

Under our at-the-market stock offering program, which commenced in July 2011, we may offer and sell shares of our common stock having an aggregate gross sales price of up to $200.0 million from time to time in "at the market" offerings. During the year ended December 31, 2012, we sold 787,118 shares of common stock under this program for aggregate gross proceeds of approximately $37.0 million and net proceeds of approximately $36.3 million, after sales agent compensation. During the year ended December 31, 2011, we sold 355,305 shares of common stock under this program for aggregate gross proceeds of approximately $13.0 million and net proceeds of approximately $12.8 million, after sales agent compensation. The proceeds from the sales were used to fund acquisitions and general corporate purposes including repayment of borrowings under the revolving credit facility. Since commencement of the program, we have sold 1,142,423 shares of common stock and, as of December 31, 2012, approximately $150.0 million remains available to be sold under this program. Actual future sales will depend upon a variety of factors including but not limited to market conditions, the trading price of the Company's common stock and our capital needs. We have no obligation to sell the remaining shares available for sale under this program.

Dividend Reinvestment and Direct Purchase Plan

During the year ended December 31, 2011, the Company had a Dividend Reinvestment and Direct Purchase Plan (the “DRIP Plan”) designed to provide the Company’s stockholders and other investors with a convenient and economical method to purchase shares of the Company’s common stock. As of December 31, 2011, no shares had been acquired under the DRIP Plan from new issuances. We terminated the DRIP Plan effective as of January 12, 2012.

Share Repurchases

An aggregate of 988,025 shares currently remain eligible for repurchase under a share-repurchase program approved by the Company’s board of directors in prior periods. The Company did not repurchase shares of common stock under this program during the years ended December 31, 2012, 2011 or 2010.

F - 38

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

Three Years Ended December 31, 2012

Accrued Dividends and Distributions

The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock, preferred stock, and noncontrolling units as of December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Dividends and Distributions payable to:
Common stockholders	$	26,224	$	20,587
Noncontrolling common unitholders of the Operating Partnership	639		601
RSU holders (1)	367		295
Total accrued dividends and distribution to common stockholders and noncontrolling unitholders	27,230		21,483
Preferred stockholders	1,694		1,209
Total accrued dividends and distributions	$	28,924	$	22,692

______________________

(1) The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12).

	December 31,
	2012	2011
Outstanding Shares and Units:
Common stock (1)	74,926,981	58,819,717
Noncontrolling common units	1,826,503	1,718,131
RSUs (2)	1,048,863	842,675
Series E Preferred stock		1,610,000
Series F Preferred stock		3,450,000
Series G Preferred stock	4,000,000
Series H Preferred stock	4,000,000

______________________

(1) The amount includes nonvested shares.

(2) The amount includes nonvested RSUs.

11.    Preferred and Common Units of the Operating Partnership

Preferred Unit Issuances

The Company issued 4,000,000 shares of its Series H Preferred Stock in August 2012 and issued 4,000,000 shares of its Series G Preferred Stock in March 2012 as discussed in Note 10. The net proceeds of approximately $96.2 million and $96.2 million were contributed by the Company to the Operating Partnership in exchange for 4,000,000 Series H Preferred Units and 4,000,000 Series G Preferred Units, respectively. The Company is the sole holder of the Series H Preferred Units and Series G Preferred Units. The terms of the Series H Preferred Units and Series G Preferred Units are substantially similar to the terms of the Series H Preferred Stock and Series G Preferred Stock, respectively, as discussed in Note 10. Distributions on the Series H Preferred Units and Series G Preferred Units are paid to the Company.

Preferred Unit Redemption

7.45% Series A Cumulative Redeemable Preferred Units

On August 15, 2012 (the "Series A Redemption Date"), the Operating Partnership redeemed all 1,500,000 outstanding units of its 7.45% Series A Cumulative Redeemable Preferred Units representing preferred limited partnership interests in the Operating Partnership ("Series A Preferred Units") as discussed in Note 9. As of December 31, 2011, all 1,500,000 Series A Preferred Units were outstanding.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

7.80% Series E and 7.50% Series F Cumulative Redeemable Preferred Units

On April 16, 2012 (the "Series E and F Redemption Date"), the Company redeemed all 1,610,000 outstanding units of its 7.80% Series E Cumulative Redeemable Preferred Units ("Series E Preferred Units") and all 3,450,000 outstanding units of its 7.50% Series F Cumulative Redeemable Preferred Units ("Series F Preferred Units"). For each share of Series E and Series F Preferred Stock that was outstanding, the Company had an equivalent number of Series E Preferred Units and Series F Preferred Units outstanding with substantially similar terms as the Series E and Series F Preferred Stock. As of December 31, 2011, all 1,610,000 Series E Preferred Units and all 3,450,000 Series F Preferred Units were outstanding.

Common Units

Issuance of Common Units

In August 2012, the Company completed an underwritten public offering of 5,750,000 shares of its common stock as discussed in Note 10. The net offering proceeds of approximately $253.8 million were contributed by the Company to the Operating Partnership in exchange for 5,750,000 common units.

In July 2012, the Company issued 118,372 common units in connection with an operating property acquisition as discussed in Note 3. Each unit was valued at $47.34, which was the Company's closing stock price on the NYSE on the acquisition date.

In February 2012, the Company completed an underwritten public offering of 9,487,500 shares of its common stock as discussed in Note 10. The net offering proceeds of approximately $382.1 million were contributed by the Company to the Operating Partnership in exchange for 9,487,500 common units.

In April 2011, the Company completed an underwritten public offering of 6,037,500 shares of its common stock as discussed in Note 10. The net offering proceeds of approximately $221.0 million were contributed by the Company to the Operating Partnership in exchange for 6,037,500 common units.

In April 2010, the Company completed an underwritten public offering of 9,200,000 shares of its common stock as discussed in Note 10. The net offering proceeds of approximately $299.8 million were contributed by the Company to the Operating Partnership in exchange for 9,200,000 common units.

At-The-Market Stock Offering Program

During the year ended December 31, 2012, the Company utilized its at-the-market stock offering program to issue an aggregate of 787,118 shares of common stock as discussed in Note 10. The net offering proceeds of approximately $36.3 million were contributed by the Company to the Operating Partnership in exchange for 787,118 common units.

During the year ended December 31, 2011, the Company utilized its at-the-market stock offering program to issue an aggregate of 355,305 shares of common stock as discussed in Note 10. The net offering proceeds of approximately $12.8 million were contributed by the Company to the Operating Partnership in exchange for 355,305 common units.

Common Units Outstanding

The Company owned 74,926,981 and 58,819,717 common units representing a 97.6% and 97.2% common general partnership interest in the Operating Partnership as of December 31, 2012 and 2011, respectively. The remaining 2.4% and 2.8% common limited partnership interest as of December 31, 2012 and 2011, respectively, was owned by certain of our executive officers and directors and non-affiliate investors in the form of noncontrolling common units.Therewere 1,826,503 and 1,718,131 common units outstanding held by these investors, officers and directors as of December 31, 2012 and 2011, respectively. For a further discussion of the noncontrolling common units during the years ended December 31, 2012 and 2011, refer to Note 9.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Accrued Distributions

The following tables summarize accrued distributions for the noted common and preferred units as of December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Distributions payable to:
General partner	$	26,224	$	20,587
Common limited partners	639		601
RSU holders (1)	367		295
Total accrued distributions to common unitholders	27,230		21,483
Preferred unitholders	1,694		1,209
Total accrued distributions	$	28,924	$	22,692

______________________

(1) The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12).

	December 31,
	2012	2011
Outstanding Units:
Common units held by the general partner	74,926,981	58,819,717
Common units held by the limited partners	1,826,503	1,718,131
RSUs	1,048,863	842,675
Series E Preferred units		1,610,000
Series F Preferred units		3,450,000
Series G Preferred units	4,000,000
Series H Preferred units	4,000,000

12.  Share-Based Compensation

Stockholder Approved Equity Compensation Plans

We establish share-based incentive compensation plans for the purpose of attracting and retaining officers, key employees, and non-employee board members. As of December 31, 2012, we had one share-based incentive compensation plan, the Kilroy Realty 2006 Incentive Award Plan as amended (the “2006 Plan”), which was adopted by our board of directors and approved by our stockholders.

As of December 31, 2012, 639,487 shares were available for grant under the 2006 Plan. The number of shares that remains available for grant is calculated using the weighted share counting provisions set forth in the 2006 Plan, which are based on the type of awards that are granted. The maximum number of shares available for grant subject to full value awards (which generally include equity awards other than options and stock appreciation rights) was 219,002 shares as of December 31, 2012.

The Executive Compensation Committee, which is comprised of four independent directors, may grant the following share-based awards as provided under the 2006 Plan: incentive stock options, nonqualified stock options, restricted stock (nonvested shares), stock appreciation rights, performance shares, performance stock units, dividend equivalents, stock payments, deferred stock, RSUs, profit interest units, performance bonus awards, performance-based awards, and other incentive awards to eligible individuals. For each award granted under our share-based incentive compensation programs, the Operating Partnership simultaneously issues to the Company a number of common units equal to the number of shares of common stock ultimately paid by the Company in respect of such awards.

All of our outstanding share-based awards issued prior to 2007 were issued under the 1997 Stock Option and Incentive Plan (the “1997 Plan”), which was terminated by our board of directors in September 2006. Any awards that were outstanding upon the termination of the 1997 Plan continued in effect in accordance with the terms of such plan and the applicable award agreement following termination of the 1997 Plan.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Stock Award Deferral Program

We have a Stock Award Deferral Program (the “RSU Program”) under the 2006 Plan. Under the RSU Program, participants may defer receipt of awards of nonvested shares that may be granted by electing to receive an equivalent number of RSUs in lieu of nonvested shares. Each RSU represents the right to receive one share of our common stock in the future and is subject to the same vesting conditions that would have applied if the award had been issued in nonvested shares. RSUs carry with them the right to receive dividend equivalents such that participants receive additional, fully-vested RSUs at the time dividends are paid equal to the value of the dividend paid on the shares underlying participant RSUs. Shares issued in settlement of vested RSUs including RSUs paid on dividend equivalents will be distributed in a single lump sum distribution upon the earlier of (1) the date specified by the participant when the election is made, which may be no earlier than two years after the start of the calendar year to which the election applies, or (2) upon other certain events specified under the RSU program.

Share-Based Compensation Programs

The Executive Compensation Committee has historically awarded nonvested shares and RSUs under the following share-based compensation programs. These share-based awards were valued based on the quoted closing share price of the Company’s common stock on the NYSE on the applicable grant date. Dividends are paid on all outstanding shares and RSUs whether vested or nonvested and are not forfeitable if the underlying shares or RSUs ultimately do not vest.

Executive Officer Share-Based Compensation Programs

The Executive Compensation Committee has annually approved compensation programs that include the potential issuance of share-based awards to our Chief Executive Officer, Chief Operating Officer, Chief Investment Officer and Chief Financial Officer (“the Executive Officers”) as part of their annual and long-term incentive compensation. Incentive compensation for our executive officers for 2011 and 2012 was structured to allow the Executive Compensation Committee to evaluate a variety of key factors and metrics at the end of the year and make a determination of share-based incentive compensation for executive officers based on the Company's and management's overall performance. In years prior to 2011, the number of nonvested shares or nonvested RSUs issued has been contingent upon specific corporate performance and market conditions. The share-based awards are generally issued in the first quarter after the end of our prior fiscal year. The share-based awards generally have a service vesting period, which has historically ranged from one to five years, depending on the type of award.

Key Employee Share-Based Compensation Program

The Executive Compensation Committee has historically awarded nonvested shares or nonvested RSUs to other key employees on an annual basis as part of their long-term incentive compensation. The share-based awards are generally issued in the first quarter, and the individual share awards generally vest in equal annual installments over the applicable service vesting period, which has historically ranged from two to five years.

Non-employee Board Members Share-Based Compensation Program

The Board of Directors awards nonvested shares or nonvested RSUs to non-employee board members on an annual basis as part of such board members’ annual compensation and to newly elected non-employee board members in accordance with our board of directors compensation program. The share-based awards are generally issued in the second quarter, and the individual share awards vest in equal annual installments over the applicable service vesting period, which will be one year.

Summary of 2012 CEO RSU Awards

On March 30, 2012, the Executive Compensation Committee of the Company's Board of Directors granted 206,477 restricted stock units ("RSUs") to the Company's Chief Executive Officer. Fifty-percent of the RSUs granted will vest in seven equal annual installments beginning on December 31, 2012 through December 31, 2018, subject to continued employment through the applicable vesting date. The grant date fair value of these time-based RSUs was $4.8 million, which was based on the $46.61 closing share price of the Company's common stock on the New York Stock Exchange on the grant date. Compensation expense will be recognized on a straight-line basis over the service vesting period for these time-based RSUs. The remaining 50% of the RSUs granted will vest in seven equal annual installments for each calendar year during 2012 through 2018 based on the achievement of certain absolute or relative total shareholder return goals measured annually or, if neither of the shareholder return hurdles are achieved for an applicable year during the performance period, those RSUs will remain eligible to vest in a subsequent year (ending in 2018) based on the achievement of a cumulative total shareholder return goal, as well as (in each case) continued employment through the applicable vesting date. The grant date fair value of these market measure-based RSUs was $4.3 million and was calculated using a Monte Carlo simulation pricing model based on the assumptions in the table below. The grant date fair value is allocated among each of the seven annual vesting tranches for these market measure-based RSUs and compensation expense will be recognized over the service vesting period using the accelerated expense attribution method.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

	March 2012 Market Measure-based RSU Grant
Grant date fair value per share	$41.20
Expected share price volatility	31.00%
Risk-free interest rate	1.60%
Dividend yield	3.80%
Expected life	7 years

The computation of expected volatility is based on a blend of the historical volatility of our shares of common stock over 14 years as that is expected to be most consistent with future volatility and equates to a time period twice as long as the seven-year term of the RSUs and implied volatility data based on the observed pricing of six-month publicly-traded options on our shares of common stock. The risk-free interest rate is based on the yield curve on zero-coupon U.S. Treasury STRIP securities in effect at the grant date. The expected dividend yield is estimated by examining the average of the historical dividend yield levels over the seven-year term of the RSUs and our current annualized dividend yield as of the grant date. The expected life of the RSUs is equal to the seven-year vesting period.

As of December 31, 2012, the first tranche of 14,748 market-measure based RSUs was earned and distributed to the Chief Executive Officer, with 6,883 shares tendered for taxes.

Summary of Time-Based RSUs

A summary of our time-based RSU activity from January 1, 2012 through December 31, 2012 is presented below:

	Nonvested RSUs
Nonvested and Vested Restricted Stock Units	Amount		Weighted-Average Grant Date Fair Value		Vested RSUs		Total RSUs
Outstanding at January 1, 2012	147,961		$	32.18	694,714		842,675
Granted (1)	204,829		44.34		—		204,829
Vested	(73,688	)	38.91		73,688		—
Settled (2)					(19,955	)	(19,955	)
Issuance of dividend equivalents (3)					28,368		28,368
Canceled (2) (4)					(7,054	)	(7,054	)
Outstanding as of December 31, 2012	279,102		$	41.30	769,761		1,048,863

 _______________________

(1) Includes 103,239 RSUs issued to the Company's Chief Executive Officer, as described above.

(2) In August 2012 and December 2012, certain vested RSUs were settled in shares of the Company's common stock.

(3) RSUs issued as dividend equivalents are vested upon issuance.

(4) We accept the return of RSUs, at the current quoted market price of the Company's common stock, to satisfy minimum statutory tax-withholding requirements related to either RSUs that have vested or RSU dividend equivalents in accordance with the terms of the 2006 Plan.

A summary of our time-based RSU activity for the years ended December 31, 2012, 2011, and 2010 is presented below:

	RSUs Granted			RSUs Vested
Year Ended	Non-Vested RSUs Issued	Weighted- Average Grant-Date Fair Value		Vested RSUs		Total Vest-Date Fair Value (1)         (in thousands)
2012	204,829	$	44.34	(73,688	)	$	3,118
2011	107,673	37.94		(85,466	)	3,273
2010	159,606	30.24		(303,146	)	10,936

________________________

(1) Total fair value of RSUs vested was calculated based on the quoted closing share price of the Company's common stock on the NYSE on the day of vesting.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Summary of Nonvested Shares

A summary of our nonvested shares activity from January 1, 2012 through December 31, 2012 is presented below:

Nonvested Shares	Shares		Weighted-Average Grant-Date Fair Value
Outstanding at January 1, 2012	83,966		$	39.83
Granted	62,137		41.84
Vested (1)	(50,862	)	41.29
Outstanding as of December 31, 2012	95,241		$	40.42

_______________

(1) The total shares vested include 18,766 of shares that were then tendered to satisfy minimum statutory tax withholding requirements related to the restricted shares that have vested in accordance with the terms of the 2006 Plan. We accept the return of shares at the current quoted market price of the Company's common stock to satisfy tax obligations.

A summary of our nonvested and vested shares activity for the years ended December 31, 2012, 2011, and 2010 is presented below:

	Shares Granted			Shares Vested
Year Ended	Non-Vested Shares Issued	Weighted- Average Grant-Date Fair Value		Vested Shares		Total Vest-Date Fair Value (1)          (in thousands)
2012	62,137	$	41.84	(50,862	)	$	2,110
2011	68,727	37.83		(34,793	)	1,334
2010	3,239	30.88		(41,680	)	1,398

_______________________

(1) Total fair value of shares vested was calculated based on the quoted closing share price of the Company's common stock on the NYSE on the day of vesting.

Summary of Stock Options

On February 22, 2012, the Executive Compensation Committee of the Company granted non-qualified stock options to certain key members of our senior management team, including our executive officers, to purchase an aggregate 1,550,000 shares of the Company's common stock at an exercise price per share equal to $42.61, the closing price of the Company's common stock on the grant date. The options will vest ratably in annual installments over a five-year period, subject to continued employment through the applicable vesting date. The term of each option is ten years from the date of the grant. Dividends will not be paid on vested or unvested options. The options were granted pursuant to the 2006 Plan.

The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on the following assumptions for the February 2012 grant.

	February 2012 Option Grant
Fair value of options granted per share	$9.20
Expected stock price volatility	33.00%
Risk-free interest rate	1.35%
Dividend yield	3.80%
Expected life of option	6.5 years

The computation of expected volatility is based on a blend of the historical volatility of our shares of common stock over a time period longer than the expected life of the option and implied volatility data based on the observed pricing of six-month publicly traded options on our shares of common stock. The risk-free interest rate is based on the yield curve on zero-coupon U.S. Treasury STRIP securities in effect at the grant date. The expected dividend yield is estimated by examining the average of the historical dividend yield levels over the expected life of the option and the current dividend yield as of the grant date. The expected life of the options is calculated as the average of the vesting term and the contractual term.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

A summary of our stock option activity from January 1, 2012 through December 31, 2012 is presented below:

	Number of Options		Exercise Price	Remaining Contractual Term (years)
Outstanding at January 1, 2012 (1)	5,000		$25.77
Granted	1,550,000		42.61
Exercised (1)	(5,000	)	25.77
Forfeited	(10,000	)	42.61
Outstanding at December 31, 2012 (2)(3)	1,540,000		$42.61	9.2

________________________

(1) Stock options outstanding as of December 31, 2011 were granted in 2002 and exercised in 2012 prior to expiration. No stock options were granted during 2003 through 2011.

(2) As of December 31, 2012, none of the outstanding stock options were exercisable.

(3) The total intrinsic value of options outstanding at December 31, 2012 was $7.3 million.

Share-based Compensation Cost Recorded During the Period

The total compensation cost for all share-based compensation programs was $8.5 million, $5.6 million, and $7.4 million for the years ended December 31, 2012, 2011, and 2010, respectively. Included in the total $7.4 million of compensation cost for the year ended December 31, 2010 was the reversal of approximately $1.1 million of cumulative compensation expense previously recorded during the years 2007 through 2010 for the 2007 Development Performance Plan, because the performance targets for this program were not ultimately achieved. Of the total share-based compensation cost, $0.9 million, $1.1 million, and $1.4 million was capitalized as part of real estate assets for the years ended December 31, 2012, 2011, and 2010, respectively. As of December 31, 2012, there was approximately $25.9 million of total unrecognized compensation cost related to nonvested incentive awards granted under share-based compensation arrangements that is expected to be recognized over a weighted-average period of 2.6 years. The remaining compensation cost related to these nonvested incentive awards had been recognized in periods prior to December 31, 2012. The $25.9 million of unrecognized compensation cost does not reflect the potential future compensation related to share-based awards that were granted subsequent to December 31, 2012.

13.  Employee Benefit Plans

401(k) Plan

We have a retirement savings plan designed to qualify under Section 401(k) of the Code (the “401(k) Plan”). Our employees are eligible to participate in the 401(k) Plan on the first day of the month after three months of service. The 401(k) Plan allows eligible employees (“401(k) Participants”) to defer up to 60% of their eligible compensation on a pre-tax basis, subject to certain maximum amounts allowed by the Code. The 401(k) Plan provides for a matching contribution by the Company in an amount equal to 50 cents of each one dollar of participant contributions up to a maximum of 10% of the 401(k) Participant’s annual salary. 401(k) Participants vest immediately in the amounts contributed by us. For each of the years ended December 31, 2012, 2011, and 2010, we contributed $0.7 million, $0.6 million, and $0.5 million, respectively, to the 401(k) Plan.

Deferred Compensation Plan

In 2007, we adopted the Deferred Compensation Plan, under which directors and certain management employees may defer receipt of their compensation, including up to 70% of their salaries and up to 100% of their director fees and bonuses, as applicable. In addition, employee participants will receive mandatory Company contributions to their Deferred Compensation Plan accounts equal to 10% of their gross monthly salaries, without regard to whether such employees elect to defer salary or bonus compensation under the Deferred Compensation Plan. Our board of directors may, but has no obligation to, approve additional discretionary contributions by the Company to Participant accounts. We hold the Deferred Compensation Plan assets in a limited rabbi trust, which is subject to the claims of our creditors in the event of bankruptcy or insolvency.

See Note 16 for further discussion of our Deferred Compensation Plan assets as of December 31, 2012 and 2011. Our liability of $7.3 million and $5.6 million under the Deferred Compensation Plan was fully funded as of December 31, 2012 and 2011, respectively.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

14.  Future Minimum Rent

We have operating leases with tenants that expire at various dates through 2027 and are either subject to scheduled fixed increases or adjustments in rent based on the Consumer Price Index. Generally, the leases grant tenants renewal options. Leases also provide for additional rents based on certain operating expenses. Future contractual minimum rent under operating leases as of December 31, 2012 for future periods is summarized as follows:

Year Ending	(in thousands)
2013	$	360,592
2014	346,840
2015	306,262
2016	273,241
2017	230,299
Thereafter	641,268
Total	$	2,158,502

15. Commitments and Contingencies

General

As of December 31, 2012, we had commitments of approximately $601.8 million for contracts and executed leases directly related to our operating and redevelopment properties. This amount includes the $27.5 million that we expect to pay in the second quarter of 2013 upon the closing of the purchase of the land underlying the ground lease at 360 Third Street in San Francisco, CA. We exercised an option to acquire the land during the fourth quarter of 2012.

In the normal course of business, we are required to post construction bonds to guarantee our performance of government-mandated infrastructure improvements. As of December 31, 2012, we had outstanding construction bonds of approximately $4.4 million.

Ground Leases

The following table summarizes our properties that are held subject to long-term noncancellable ground lease obligations and the respective contractual expiration dates:

Property	Contractual Expiration Date(1)
601 108th Ave NE, Bellevue, Washington	November 2093
701, 801 and 837 N. 34th Street, Seattle, Washington (2)	December 2041
Kilroy Airport Center Phases I, II, and III, Long Beach, California	July 2084
360 Third Street, San Francisco, California	December 2022

____________________

(1) Reflects the contractual expiration date prior to the impact of any extension or purchase options held by the Company.

(2) The Company has three10-year and one45-year extension option for this ground lease which if exercised would extend the expiration date to December 2116.

The minimum commitment under our ground leases as of December 31, 2012 for five years and thereafter was as follows:

Year Ending	(in thousands)
2013	$	3,685
2014	3,095
2015	3,095
2016	3,095
2017	3,095
Thereafter	160,007
Total(1)(2)(3)(4)(5)	$	176,072

________________________

(1) Reflects the minimum ground lease obligations before the impact of ground lease extension options.

(2) One of our ground lease obligations is subject to a fair market value adjustment every five years; however, the lease includes ground rent subprotection and infrastructure rent credits which currently limit our annual rental obligations to $1.0 million. The contractual obligations for that ground lease included above assumes the lesser of $1.0 million or annual lease rental obligation in effect as of December 31, 2012.

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

(3) One of our ground lease obligations includes a component which is based on the percentage of gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every five years based on 50% of the average annual percentage rent for the previous five years. Currently, gross income does not exceed the threshold requiring us to pay percentage rent. The contractual obligations for that ground lease included above assumes the annual lease rental obligation in effect as of December 31, 2012.

(4) One of our ground lease obligations is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals limited to maximum increases annually. The contractual obligations included above assumes the annual lease rental obligation in effect as of December 31, 2012.

(5) As previously discussed, the Company exercised the land purchase option included in the 360 3rd Street ground lease and will acquire the land in the second quarter of 2013. The amount presented above includes payments through the second quarter of 2013 and excludes the purchase price of $27.5 million.

Litigation

We and our properties are subject to litigation arising in the ordinary course of business. To our knowledge, neither we nor any of our properties are presently subject to any litigation or threat of litigation which, if determined unfavorably to us, would have a material adverse effect on our cash flow, financial condition, or results of operations.

During the fourth quarter of 2011, we received cash distributions totaling $3.7 million under a bankruptcy claim related to a former tenant that defaulted on their lease in 2009. Due to these and other distributions received earlier in the year, we recognized $4.3 million from this claim as other property income in 2011. In the fourth quarter of 2012, we received the final cash distribution under the bankruptcy claim of $0.9 million, which we recognized as other property income in 2012.

In the third quarter of 2010, we settled outstanding litigation related to certain premises at one of our properties that had been abandoned by its former occupants. In connection with this legal settlement, we received a $3.6 million cash payment in 2010. In addition, in January 2011 we received a $1.0 million cash payment relating to this matter. As a result, during the year ended December 31, 2010, we reversed approximately $1.0 million of our allowance for bad debts which was previously recorded in prior periods for receivables related to the lease at this property.

Insurance

We maintain commercial general liability, auto liability, employers liability, umbrella/excess liability, special form property, difference in conditions including earthquake and flood, environmental, rental loss, and terrorism insurance covering all of our properties. Management believes the policy specifications and insured limits are reasonable given the relative risk of loss, the cost of the coverage, and industry practice. We do not carry insurance for generally uninsurable losses such as loss from governmental action, nuclear hazard, and war and military action. Policies are subject to various terms, conditions, and exclusions and some policies may involve large deductibles or co-payments.

Environmental Matters

We follow the policy of monitoring our properties for the presence of hazardous or toxic substances. While there can be no assurance that a material environmental liability does not exist, we are not currently aware of any environmental liability with respect to the properties that would have a material adverse effect on our financial condition, results of operations, and cash flow. Further, we are not aware of any environmental liability or any unasserted claim or assessment with respect to an environmental liability that we believe would require additional disclosure or the recording of a loss contingency.

16. Fair Value Measurements and Disclosures

Assets and Liabilities Reported at Fair Value

The only assets we record at fair value on our consolidated financial statements are the marketable securities related to our Deferred Compensation Plan (see Note 13). The following table sets forth the fair value of our marketable securities as of December 31, 2012 and 2011 :

	Fair Value (Level 1) (1)
	2012		2011
Description	(in thousands)
Marketable securities (2)	$	7,435	$	5,691

_______________

(1) Based on quoted prices in active markets for identical securities.

(2) The marketable securities are held in a limited rabbi trust.

We report the change in the fair value of the marketable securities at the end of each accounting period in interest income and other net investment gains in the consolidated statements of operations. We also adjust the related Deferred Compensation Plan liability to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each participant, which results in a corresponding increase or decrease to compensation cost for the period.

The following table sets forth the net gain (loss) on marketable securities recorded during the years ended December 31, 2012, 2011, and 2010:

F - 47

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Description	December 31, 2012		December 31, 2011			December 31, 2010
	(in thousands)
Net gain (loss) on marketable securities	$	723	$	(153	)	$	435

Financial Instruments Disclosed at Fair Value

The following table sets forth the carrying value and the fair value of our other financial instruments as of December 31, 2012 and 2011:

	December 31,
	2012				2011
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Liabilities
Secured debt (1)	$	561,096	$	591,993	$	351,825	$	367,402
Exchangeable senior notes, net (1)	163,944		181,223		306,892		320,919
Unsecured debt, net (2)	1,130,895		1,254,047		980,569		1,011,982
Unsecured line of credit (1)	185,000		185,049		182,000		182,299

_______________

(1) Fair value calculated using Level II inputs which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.

(2) Fair value calculated primarily using Level I inputs which are based on quoted prices for identical instruments in active markets. The carrying value and fair value of the Level I instruments was $653.0 million and $573.0 million, respectively, as of December 31, 2012. The carrying value and fair value of the Level I instruments at December 31, 2011, was $897.6 million and $923.1 million, respectively. The carrying value and fair value of the Level II instruments was $601.0 million and $558.0 million, respectively, as of December 31, 2012. The carrying value and fair value of the Level II instruments at December 31, 2011, was $83.0 million and $88.9 million, respectively.

17. Discontinued Operations

Properties Held For Sale

We did not have any properties held for sale as of December 31, 2012. We had two properties classified as held for sale at December 31, 2011, which were sold in January 2012. The major classes of assets and liabilities of these properties held for sale as of December 31, 2011 were as follows:

Real estate assets and other assets held for sale	(in thousands)
Land and improvements	$	6,490
Buildings and improvements	83,447
Total real estate held for sale	89,937
Accumulated depreciation	(14,905		)
Total real estate held for sale, net	75,032
Deferred rent receivables, net	6,749
Deferred leasing costs and acquisition-related intangible assets, net	2,375
Real estate assets and other assets held for sale, net	$	84,156
Liabilities and deferred revenue of real estate assets held for sale
Accounts payable, accrued expenses and other liabilities	$	24
Deferred revenue and acquisition-related intangible liabilities, net	13,223
Rents received in advance and tenant security deposits	39
Liabilities and deferred revenue of real estate assets held for sale	$	13,286

F - 48

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Dispositions

The following table summarizes properties sold during the years ended December 31, 2012, 2011, and 2010.

Location	Property Type	Month of Disposition	Number of Buildings	Rentable Square Feet	Sales Price (in millions) (1)
2012 Dispositions
15004 Innovation Drive and 10243 Genetic Center Drive, San Diego, CA (2)	Office	January	2	253,676	$	146.1
Industrial Portfolio (3)	Industrial	November/December	39	3,413,354
5151, 5153 & 5155 Camino Ruiz, Camarillo, CA	Office	December	4	265,372
4175 E. La Palma Avenue, Anaheim, CA	Office	December	1	43,263
Subtotal			44	3,721,989	354.2
Total			46	3,975,665	$	500.3
2011 Dispositions
10350 Barnes Canyon and 10120 Pacific Heights Drive, San Diego, CA	Office	September	2	90,558	$	23.9
2031 E. Mariposa Avenue, Los Angeles, CA	Industrial	December	1	192,053	42.2
Total			3	282,611	$	66.1
2010 Dispositions
660 N. Puente Street, Brea, CA	Industrial	October	1	51,567	$	5.0
601 Valencia Avenue, Brea, CA	Office	December	1	60,891	5.4
603 Valencia Avenue, Brea, CA	Office	December	1	45,900	5.4
Total			3	158,358	$	15.8

__________________

(1) Represents gross sales price before the impact of broker commissions and selling costs.

(2) These properties were classified as held-for-sale on the consolidated balance sheets as of December 31, 2011.

(3) The industrial portfolio was sold in two tranches in November and December 2012 to two separate third party buyers.

At December 31, 2012, approximately $228.8 million of net proceeds related to the sale of the buildings during the quarter ended December 31, 2012 were temporarily being held at a qualified intermediary, at our direction, for the purpose of facilitating Section 1031 Exchanges. The $228.8 million cash proceeds are included in restricted cash on the consolidated balance sheets at December 31, 2012. In January 2013, we successfully completed two Section 1031 Exchanges and all cash proceeds were released from the qualified intermediary.

F - 49

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

Discontinued Operations

The following table summarizes the income and expense components that comprise discontinued operations for the years ended December 31, 2012, 2011 and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Revenues:
Rental income	$	22,337		$	39,226		$	39,404
Tenant reimbursements	3,902			5,502			6,330
Other property income	323			790			1,252
Total revenues	26,562			45,518			46,986
Expenses:
Property expenses	4,586			6,733			6,898
Real estate taxes	2,779			4,000			4,020
Provision for bad debts	(195		)	(137		)	(1,128		)
Depreciation and amortization	6,983			11,668			12,973
Interest expense (1)	—			3,624			4,859
Total expenses	14,153			25,888			27,622
Income from discontinued operations before net gain on dispositions of discontinued operations	12,409			19,630			19,364
Net gain on dispositions of discontinued operations	259,245			51,587			949
Total income from discontinued operations	$	271,654		$	71,217		$	20,313

__________________

(1) Interest expense relates to a $70.0 million mortgage loan that was secured by 13 of our industrial properties. The mortgage loan was repaid in October 2011 prior to maturity.

The following table summarizes the total income from discontinued operations within the consolidated statements of operations by segment for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Office Properties	$	77,157	$	20,535	$	7,673
Industrial Properties(1)	194,497		50,682		12,640
Total income from discontinued operations	$	271,654	$	71,217	$	20,313

__________________

(1) The industrial properties were no longer a segment at December 31, 2012 because we disposed of all of our industrial properties during the fourth quarter of 2012.

F - 50

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

18. Segment Disclosure

At December 31, 2012 we only had one segment, which was our office properties segment, since all of our industrial properties were sold during the year ended December 31, 2012 and the results of operations for these properties were included in discontinued operations for the years ended December 31, 2012, 2011 and 2010. During the year ended December 31, 2011 we had one reportable segment, which was our office properties segment, and we had one non-reportable segment, which was our industrial properties segment. The following table, which reconciles total segment assets to total consolidated assets, is presented solely for the purposes of showing the comparative information for our asset composition at December 31, 2012 and December 31, 2011.

	December 31,
	2012		2011
	(in thousands)
Assets:
Reportable Segment - Office Properties
Land, buildings, and improvements, net	$	3,191,225	$	2,480,338
Undeveloped land and construction in progress	809,654		430,806
Total assets(1)	4,315,485		3,248,661
Non-Reportable Segment - Industrial Properties
Land, buildings, and improvements, net	—		145,043
Total assets(1)	—		156,741
Total Segments
Land, buildings, and improvements, net	3,191,225		2,625,381
Undeveloped land and construction in progress	809,654		430,806
Total assets(1)	4,315,485		3,405,402

Reconciliation to Consolidated Assets:
Total assets allocated to segments	4,315,485		3,405,402
Other unallocated assets:
Cash and cash equivalents	16,700		4,777
Restricted cash	247,544		358
Marketable securities	7,435		5,691
Deferred financing costs, net	18,971		18,368
Prepaid expenses and other assets, net	9,949		12,199
Total consolidated assets	$	4,616,084	$	3,446,795

_______________

(1) Includes land, buildings, and improvements, undeveloped land and construction in progress, real estate assets held for sale, current receivables, deferred rent receivables, deferred

leasing costs, and acquisition-related intangible assets, all shown on a net basis.

F - 51

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

	December 31,
	2012		2011
	(in thousands)
Acquisitions and Capital Expenditures:(1)
Reportable Segment - Office Properties
Expenditures for real estate acquisitions	$	1,087,489	$	663,483
Expenditures for development and redevelopment properties and undeveloped land	144,477		32,198
Expenditures for operating properties(2)	86,089		66,448
Non-Reportable Segment - Industrial Properties
Expenditures for operating properties(2)	1,131		6,001
Total Segments
Expenditures for real estate acquisitions	1,087,489		663,483
Expenditures for development and redevelopment properties and undeveloped land	144,477		32,198
Expenditures for operating properties(2)	87,220		72,449

_______________

(1) Total consolidated acquisitions and capital expenditures are equal to the same amounts disclosed for total segments. Amounts represent balances on an accrual basis.

(2) Includes expenditures for building improvements, tenant improvements, deferred leasing costs and acquisition-related intangible assets for our operating properties. Excludes acquisition-related intangible liabilities.

F - 52

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

19. Net Income Available to Common Stockholders Per Share of the Company

The following table reconciles the numerator and denominator in computing the Company's basic and diluted per-share computations for net income available to common stockholders for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands, except share and per share amounts)
Numerator:
Income (loss) from continuing operations	$	5,447		$	(3,728	)	(427		)
Loss from continuing operations attributable to noncontrolling common units of the Operating Partnership	383			545			468
Preferred distributions and dividends	(21,088		)	(15,196		)	(15,196		)
Allocation to participating securities (nonvested shares and time-based RSUs)	(1,602		)	(1,309		)	(1,151		)
Numerator for basic and diluted loss from continuing operations available to common stockholders	(16,860		)	(19,688		)	(16,306		)
Income from discontinued operations	271,654			71,217			20,313
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership	(6,570		)	(2,019		)	(646		)
Numerator for basic and diluted net income available to common stockholders	$	248,224		$	49,510		$	3,361
Denominator:
Basic weighted average vested shares outstanding	69,639,623			56,717,121			49,497,487
Effect of dilutive securities—contingently issuable shares and stock options	—			—			—
Diluted weighted average vested shares and common share equivalents outstanding	69,639,623			56,717,121			49,497,487
Basic earnings per share:
Loss from continuing operations available to common stockholders per share	$	(0.24	)	$	(0.35	)	$	(0.33	)
Income from discontinued operations per common share	3.80			1.22			0.40
Net income available to common stockholders per share	$	3.56		$	0.87		$	0.07
Diluted earnings per share:
Loss from continuing operations available to common stockholders per share	$	(0.24	)	$	(0.35	)	$	(0.33	)
Income from discontinued operations per common share	3.80			1.22			0.40
Net income available to common stockholders per share	$	3.56		$	0.87		$	0.07

The impact of the contingently issuable shares, which consist of the 88,490 market measure-based RSUs and the Exchangeable Notes, and the 1,540,000 stock options, were not considered in our diluted earnings per share calculation for the year ended December 31, 2012 because we reported a loss from continuing operations attributable to common stockholders and the effect was anti-dilutive. The impact of stock options and the Exchangeable Notes during the years ended December 31, 2011 and 2010, were not considered in our diluted earnings per share calculation for the years ended December 31, 2011 and 2010 because we reported a loss from continuing operations attributable to common stockholders and the effect was anti-dilutive. See Note 7 for additional information regarding the Exchangeable Notes and Note 12 for additional information regarding the outstanding stock options and market measure-based RSUs.

F - 53

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

20.    Net Income Available to Common Unitholders Per Unit of the Operating Partnership

The following table reconciles the numerator and denominator in computing the Operating Partnership's basic and diluted per-unit computations for net income available to common unitholders for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands, except unit and per unit amounts)
Numerator:
Income (loss) from continuing operations	$	5,447		$	(3,728	)	$	(427	)
Income from continuing operations attributable to noncontrolling interests in consolidated subsidiaries	(174		)	(529		)	(162		)
Preferred distributions	(21,088		)	(15,196		)	(15,196		)
Allocation to participating securities (nonvested units and time-based RSUs)	(1,602		)	(1,309		)	(1,151		)
Numerator for basic and diluted loss from continuing operations available to common unitholders	(17,417		)	(20,762		)	(16,936		)
Income from discontinued operations	271,654			71,217			20,313
Income from discontinued operations attributable to noncontrolling interests in consolidated subsidiaries	(464		)	—			—
Numerator for basic and diluted net income available to common unitholders	$	253,773		$	50,455		$	3,377
Denominator:
Basic weighted average vested units outstanding	71,403,258			58,437,444			51,220,618
Effect of dilutive securities-contingently issuable shares and stock options	—			—			—
Diluted weighted average vested units and common unit equivalents outstanding	71,403,258			58,437,444			51,220,618
Basic earnings per unit:
Loss from continuing operations available to common unitholders per unit	$	(0.24	)	$	(0.36	)	$	(0.33	)
Income from discontinued operations per common unit	3.80			1.22			0.40
Net income available to common unitholders per unit	$	3.56		$	0.86		$	0.07
Diluted earnings per unit:
Loss from continuing operations available to common unitholders per unit	$	(0.24	)	$	(0.36	)	$	(0.33	)
Income from discontinued operations per common unit	3.80			1.22			0.40
Net income available to common unitholders per unit	$	3.56		$	0.86		$	0.07

The impact of the contingently issuable units, which consist of the 88,490 market measure-based RSUs, the Exchangeable Notes, and the 1,540,000 stock options, were not considered in our diluted earnings per unit calculation for the year ended December 31, 2012 because the Operating Partnership reported a loss from continuing operations attributable to common unitholders and the effect was anti-dilutive. The impact of stock options and the Exchangeable Notes during the years ended December 31, 2011 and 2010, were not considered in our diluted earnings per unit calculation for the years ended December 31, 2011 and 2010 because we reported a loss from continuing operations attributable to common unitholders and the effect was anti-dilutive. See Note 7 for additional information regarding the Exchangeable Notes and Note 12 for additional information regarding the outstanding stock options and market measure-based RSUs.

F - 54

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

21.  Tax Treatment of Distributions

The following table reconciles the dividends declared per common share to the dividends paid per common share during the years ended December 31, 2012, 2011, and 2010 as follows:

	Year Ended December 31,
Dividends	2012		2011		2010
Dividends declared per common share	1.400		1.400		1.400
Less: Dividends declared in the current year and paid in the following year	(0.350	)	(0.350	)	(0.350	)
Add: Dividends declared in the prior year and paid in the current year	0.350		0.350		0.350
Dividends paid per common share	1.400		1.400		1.400

The unaudited income tax treatment for the dividends to common stockholders reportable for the years ended December 31, 2012, 2011, and 2010 as identified in the table above was as follows:

	Year Ended December 31,
Common Shares	2012				2011				2010
Ordinary income	$	0.577	41.21	%	$	0.230	16.43	%	$	—	—	%
Return of capital	0.823		58.79		1.170		83.57		1.400		100.00
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	1.400	100.00	%	$	1.400	100.00	%	$	1.400	100.00	%

_________________

(1) Capital gains are comprised entirely of 15% rate gains.

The unaudited income tax treatment for the dividends to Series E preferred stockholders reportable for the years ended December 31, 2012, 2011, and 2010 is seen in the table below. Series E preferred stock was redeemed on April 16, 2012.

	Year Ended December 31,
Preferred Shares	2012				2011				2010
Ordinary income	$	0.818	100.00	%	$	1.950	100.00	%	$	1.950	100.00	%
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	0.818	100.00	%	$	1.950	100.00	%	$	1.950	100.00	%

__________________

(1) Capital gains are comprised entirely of 15% rate gains.

The unaudited income tax treatment for the dividends to Series F preferred stockholders reportable for the years ended December 31, 2012, 2011, and 2010 is seen in the table below. Series F preferred stock was redeemed on April 16, 2012.

	Year Ended December 31,
Preferred Shares	2012				2011				2010
Ordinary income	$	0.786	100.00	%	$	1.875	100.00	%	$	1.875	100.00	%
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	0.786	100.00	%	$	1.875	100.00	%	$	1.875	100.00	%

_________________

(1) Capital gains are comprised entirely of 15% rate gains.

F - 55

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

The 6.875% Series G Cumulative Redeemable Preferred Stock was issued in March 2012. The unaudited income tax treatment for the dividends to Series G preferred stockholders reportable for the year ended December 31, 2012 was as follows:

	Year Ended December 31,
Preferred Shares	2012
Ordinary income	$	1.089	100.00	%
Capital gains (1)	—		—
Unrecaptured section 1250 gains	—		—
	$	1.089	100.00	%

__________________

(1) Capital gains are comprised entirely of 15% rate gains.

The 6.375% Series H Cumulative Redeemable Preferred Stock was issued in August 2012. The unaudited income tax treatment for the dividends to Series H preferred stockholders reportable for the year ended December 31, 2012 was as follows:

	Year Ended December 31,
Preferred Shares	2012
Ordinary income	$	0.398	100.00	%
Capital gains (1)	—		—
Unrecaptured section 1250 gains	—		—
	$	0.398	100.00	%

__________________

(1) Capital gains are comprised entirely of 15% rate gains.

F - 56

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

22. Quarterly Financial Information of the Company (Unaudited)

Summarized quarterly financial data for the years ended December 31, 2012 and 2011 was as follows:

	2012 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	92,397		$	97,111		$	104,293		$	111,111
Net Operating Income from continuing operations (2)(3)	67,791			68,437			72,251			79,276
Income (loss) from continuing operations (3)	2,165			36			(665		)	3,911
Income from discontinued operations (3)	76,506			2,241			3,187			189,720
Net income	78,671			2,277			2,522			193,631
Net income attributable to Kilroy Realty Corporation	76,876			2,297			2,589			189,152
Preferred dividends and distributions	(9,336		)	(3,097		)	(5,342		)	(3,313		)
Net income (loss) available to common stockholders	67,540			(800		)	(2,753		)	185,839
Net income (loss) available to common stockholders per share—basic	1.06			(0.02		)	(0.04		)	2.49
Net income (loss) available to common stockholders per share—diluted	1.06			(0.02		)	(0.04		)	2.45
	2011 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	76,003		$	81,002		$	86,398		$	94,226
Net Operating Income from continuing operations (2)(3)	53,660			56,910			60,268			67,777
Income from continuing operations (3)	750			(1,071		)	(3,391		)	(16		)
Income from discontinued operations (3)	4,117			4,543			17,681			44,876
Net income	4,867			3,472			14,290			44,860
Net income attributable to Kilroy Realty Corporation	4,833			3,482			13,994			43,706
Preferred dividends and distributions	(3,799		)	(3,799		)	(3,799		)	(3,799		)
Net income (loss) available to common stockholders	1,034			(317		)	10,195			39,907
Net income (loss) available to common stockholders per share—basic	0.01			(0.01		)	0.17			0.68
Net income (loss) available to common stockholders per share—diluted	0.01			(0.01		)	0.17			0.68

____________________

(1) The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding.  The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

(2) Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

(3) All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

F - 57

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

23. Quarterly Financial Information of the Operating Partnership (Unaudited)

Summarized quarterly financial data for the years ended December 31, 2012 and 2011 was as follows:

	2012 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per unit amounts)
Revenues from continuing operations (3)	$	92,397		$	97,111		$	104,293		$	111,111
Net Operating Income from continuing operations (2)(3)	67,791			68,437			72,251			79,276
Income (loss) from continuing operations (3)	2,165			36			(665		)	3,911
Income from discontinued operations (3)	76,506			2,241			3,187			189,720
Net income	78,671			2,277			2,522			193,631
Net income attributable to the Operating Partnership	78,618			2,234			2,474			193,137
Preferred distributions	(9,336		)	(3,097		)	(5,342		)	(3,313		)
Net income (loss) available to common unitholders	69,282			(863		)	(2,868		)	189,824
Net income (loss) available to common unitholders per unit—basic	1.05			(0.02		)	(0.04		)	2.48
Net income (loss) available to common unitholders per unit—diluted	1.05			(0.02		)	(0.04		)	2.44
	2011 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per unit amounts)
Revenues from continuing operations (3)	$	76,003		$	81,002		$	86,398		$	94,226
Net Operating Income from continuing operations (2)(3)	53,660			56,910			60,268			67,777
Income from continuing operations (3)	750			(1,071		)	(3,391		)	(16		)
Income from discontinued operations (3)	4,117			4,543			17,681			44,876
Net income	4,867			3,472			14,290			44,860
Net income attributable to the Operating Partnership	4,833			3,440			14,260			44,427
Preferred distributions	(3,799		)	(3,799		)	(3,799		)	(3,799		)
Net income (loss) available to common unitholders	1,034			(359		)	10,461			40,628
Net income (loss) available to common unitholders per unit—basic	0.01			(0.01		)	0.17			0.68
Net income (loss) available to common unitholders per unit—diluted	0.01			(0.01		)	0.17			0.68

___________________

(1) The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding.  The summation of the quarterly net income (loss) available to common unitholders per unit does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

(2) Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

(3) All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

F - 58

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

24.    Subsequent Events

Subsequent to December 31, 2012, we repaid a $83.1 million secured mortgage loan prior to its maturity date of April 2013.

On January 14, 2013, the Operating Partnership issued unsecured senior notes in a public offering with an aggregate principal balance of $300.0 million that are scheduled to mature on January 15, 2023. The unsecured senior notes require semi-annual interest payments each January and July based on a stated annual interest rate of 3.800%. The Company used a portion of the net proceeds for general corporate purposes, including the repayment of borrowings under the revolving credit facility.

On January 15, 2013 aggregate dividends, distributions, and dividend equivalents of $26.2 million were paid to common stockholders and common unitholders of record on December 31, 2012 and RSU holders of record on January 15, 2013.

On January 16, 2013, we completed the acquisition of a 320,000 rentable square foot office project in the South Lake Union submarket of greater Seattle for a purchase price of approximately $170.0 million. The purchase price includes the assumption of approximately $83.9 million of debt secured by the project. We are currently in the process of completing the purchase price allocation for this acquisition.

On January 10, 2013, the Executive Compensation Committee granted 157,744 RSUs to the Executive Officers and other key employees under the 2006 Plan. The grant date fair value of these time-based RSUs was $7.7 million, which was based on the $48.88 closing share price of the Company's common stock on the New York Stock Exchange on the grant date, is expected to be recognized over a period of 5 years.

F - 59

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

25. Pro Forma Results of the Company (Unaudited)

The first table of pro forma consolidated results of operations of the Company for the years ended December 31, 2012 and 2011 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011. The second table of pro forma consolidated results of operations of the Company for the years ended December 31, 2011 and 2010 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011 and that the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, were completed as of January 1, 2010. Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2011 and 2010, respectively, nor does it intend to be a projection of future results.

	Year EndedDecember 31,
	2012		2011
	(in thousands except per share amounts)
Revenues from continuing operations	$	414,813	$	363,815
Net income available to common stockholders(1)(3)	$	238,947	$	42,601
Net income available to common stockholders per share - basic(1)(3)	$	3.41	$	0.73
Net income available to common stockholders per share - diluted(1)(3)	$	3.41	$	0.73

	Year EndedDecember 31,
	2011		2010
	(in thousands except per share amounts)
Revenues from continuing operations	$	377,871	$	283,941
Net income available to common stockholders(1)(2)(3)	$	41,293	$	2,491
Net income available to common stockholders per share - basic(1)(2)(3)	$	0.71	$	0.03
Net income available to common stockholders per share - diluted(1)(2)(3)	$	0.71	$	0.03

_________________

(1) The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisition of 4100-4700 Bohannon Drive, Menlo Park, CA , 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

(2) The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

(3) The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to common stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

The following table summarizes the results of operations for the properties at 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, from February 29, 2012, July 24, 2012 and December 17, 2012, the dates of acquisition, respectively, through December 31, 2012:

	(in thousands)
Revenues	$	18,943
Net income(1)	$	3,412

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

The following table summarizes the results of operations for the properties at 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, from June 3, 2011 and September 15, 2011, the dates of acquisition, respectively, through December 31, 2011:

	(in thousands)
Revenues	$	15,150
Net income(1)	$	397

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

F - 60

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS — (Continued)

26. Pro Forma Results of the Operating Partnership (Unaudited)

The first table of pro forma consolidated results of operations of the Operating Partnership for the years ended December 31, 2012 and 2011 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011. The second table of pro forma consolidated results of operations of the Operating Partnership for the years ended December 31, 2011 and 2010 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011 and that the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, were completed as of January 1, 2010. Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2011 and 2010, respectively, nor does it intend to be a projection of future results.

	Year EndedDecember 31,
	2012		2011
	(in thousands except per unit amounts)
Revenues from continuing operations	$	414,813	$	363,815
Net income available to common unitholders(1)(3)	$	244,337	$	43,386
Net income available to common unitholders per unit - basic(1)(3)	$	3.40	$	0.72
Net income available to common unitholders per unit - diluted(1)(3)	$	3.40	$	0.72

	Year EndedDecember 31,
	2011		2010
	(in thousands except per unit amounts)
Revenues from continuing operations	$	377,871	$	283,941
Net income available to common unitholders(1)(2)(3)	$	42,039	$	2,437
Net income available to common unitholders per unit - basic(1)(2)(3)	$	0.70	$	0.03
Net income available to common unitholders per unit - diluted(1)(2)(3)	$	0.70	$	0.03

_______________

(1) The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA and 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

(2) The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

(3) The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

The following table summarizes the results of operations for the properties at 4100-4700 Bohannon Drive, Menlo Park, CA, and 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, from February 29, 2012, July 24, 2012, and December 17, 2012, the dates of acquisition, respectively, through December 31, 2012:

	(in thousands)
Revenues	$	18,943
Net income(1)	$	3,412

_______________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

The following table summarizes the results of operations for the properties at 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, from June 3, 2011 and September 15, 2011, the dates of acquisition, respectively, through December 31, 2011:

	(in thousands)
Revenues	$	15,150
Net income(1)	$	397

_______________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

F - 61

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS

Years ended December 31, 2012, 2011, and 2010

(in thousands)

	Balance at Beginning of Period		Charged to Costs and Expenses (1)			Recoveries (Deductions)			Balance at End of Period
Allowance for Uncollectible Tenant Receivables
Year ended December 31, 2012—Allowance for uncollectible tenant receivables	$	2,590	$	(42	)	$	33		$	2,581
Year ended December 31, 2011—Allowance for uncollectible tenant receivables	$	2,819	$	923		$	(1,152	)	$	2,590
Year ended December 31, 2010—Allowance for uncollectible tenant receivables	$	3,063	$	16		$	(260	)	$	2,819
Allowance for Unbilled Deferred Rent
Year ended December 31, 2012—Allowance for deferred rent	$	3,406	$	—		$	(799	)	$	2,607
Year ended December 31, 2011—Allowance for deferred rent	$	3,831	$	(279	)	$	(146	)	$	3,406
Year ended December 31, 2010—Allowance for deferred rent	$	6,388	$	(1,079	)	$	(1,478	)	$	3,831

____________________

(1) Includes amounts reported in Discontinued Operations (see Note 17).

F - 62

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III—REAL ESTATE AND ACCUMULATED DEPRECIATION

December 31, 2012

	Initial Cost									Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances			Land		Buildings and Improve- ments		Costs Capitalized Subsequent to Acquisition/ Improvement		Land		Buildings and Improve- ments		Total		Accumulated Depreciation		Deprecia- tion Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	(in thousands)
Office Properties:
23925 Park Sorrento Calabasas, California	$	11,210	(5)	$	50	$	2,346	$	304	$	50	$	2,650	$	2,700	$	1,293	35	2001	(C)	11,789
23975 Park Sorrento Calabasas, California			(5)	765		17,720		5,370		765		23,090		23,855		10,909		35	2002	(C)	100,592
24025 Park Sorrento Calabasas, California			(5)	845		15,896		3,716		845		19,612		20,457		9,913		35	2000	(C)	102,264
26541 Agoura Road Calabasas, California				1,979		9,630		9,798		1,979		19,428		21,407		9,765		35	1997	(A)	90,156
2240 E. Imperial Highway El Segundo, California				1,044		11,763		23,715		1,048		35,474		36,522		17,379		35	1983	(C)	122,870
2250 E. Imperial Highway El Segundo, California				2,579		29,062		23,009		2,547		52,103		54,650		40,489		35	1983	(C)	298,728
2260 E. Imperial Highway El Segundo, California				2,518		28,370		19,134		2,547		47,475		50,022		895		35	1983	(C)	298,728
909 Sepulveda Boulevard El Segundo, California	68,615		(6)	3,577		34,042		39,782		3,577		73,824		77,401		20,802		35	2005	(C)	241,607
999 Sepulveda Boulevard El Segundo, California			(6)	1,407		34,326		10,995		1,407		45,321		46,728		13,604		35	2003	(C)	128,504
3750 Kilroy Airport Way Long Beach, California						1,941		10,248				12,189		12,189		8,305		35	1989	(C)	10,457
3760 Kilroy Airport Way Long Beach, California						17,467		8,196				25,663		25,663		19,147		35	1989	(C)	165,278
3780 Kilroy Airport Way Long Beach, California						22,319		14,561				36,880		36,880		29,000		35	1989	(C)	219,745
3800 Kilroy Airport Way Long Beach, California						19,408		16,641				36,049		36,049		18,072		35	2000	(C)	192,476
3840 Kilroy Airport Way Long Beach, California						13,586		10,353				23,939		23,939		12,394		35	1999	(C)	136,026
3880 Kilroy Airport Way Long Beach, California						9,704		5,676				15,380		15,380		225		35	1997	(A)	(14	)
3900 Kilroy Airport Way Long Beach, California						12,615		8,264				20,879		20,879		10,966		35	1997	(A)	126,840
Kilroy Airport Center, Phase IV Long Beach, California(4)								2,087				2,087		2,087		2,087		35
12100 W. Olympic Boulevard Los Angeles, California				352		45,611		15,401		9,633		51,731		61,364		15,325		35	2003	(C)	150,167
12200 W. Olympic Boulevard Los Angeles, California				4,329		35,488		15,145		3,977		50,985		54,962		26,198		35	2000	(C)	150,302
12233 W. Olympic Boulevard Los Angeles, California	40,523		(7)	22,100		53,170		428		22,100		53,598		75,698		415		35	2012	(A)	151,029
12312 W. Olympic Boulevard Los Angeles, California				3,325		12,202		714		3,399		12,842		16,241		5,703		35	1997	(A)	78,000
6255 W. Sunset Boulevard Los Angeles, California	53,554		(8)	18,111		60,320		3,948		18,111		64,268		82,379		1,380		35	2012	(A)	321,883
1633 26th Street Santa Monica, California				2,080		6,672		3,147		2,040		9,859		11,899		4,889		35	1997	(A)	44,915
2100/2110 Colorado Avenue Santa Monica, California	97,000		(9)	5,474		26,087		13,114		5,476		39,199		44,675		13,927		35	1997	(A)	102,864
3130 Wilshire Boulevard Santa Monica, California				8,921		6,579		10,413		9,188		16,725		25,913		9,513		35	1997	(A)	88,339
501 Santa Monica Boulevard Santa Monica, California				4,547		12,044		6,427		4,551		18,467		23,018		9,456		35	1998	(A)	73,115
2829 Townsgate Road Thousand Oaks, California				5,248		8,001		5,585		5,248		13,586		18,834		7,221		35	1997	(A)	81,067
12225 El Camino Real Del Mar, California				1,700		9,633		2,992		1,683		12,642		14,325		4,943		35	1998	(A)	60,148
12235 El Camino Real Del Mar, California				1,507		8,543		4,495		1,530		13,015		14,545		6,375		35	1998	(A)	54,673
12340 El Camino Real Del Mar, California			(6)	4,201		13,896		7,369		4,201		21,265		25,466		6,809		35	2002	(C)	87,405
12390 El Camino Real Del Mar, California			(6)	3,453		11,981		1,263		3,453		13,244		16,697		6,840		35	2000	(C)	72,332
12348 High Bluff Drive Del Mar, California				1,629		3,096		3,451		1,629		6,547		8,176		4,413		35	1999	(C)	38,710
12400 High Bluff Drive Del Mar, California				15,167		40,497		11,609		15,167		52,106		67,273		16,183		35	2004	(C)	208,464

F - 63

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III—REAL ESTATE AND ACCUMULATED DEPRECIATION—(Continued)

December 31, 2012

	Initial Cost					Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances	Land	Buildings and Improve- ments	Costs Capitalized Subsequent to Acquisition/ Improvement		Land	Buildings and Improve- ments	Total	Accumulated Depreciation	Deprecia- tion Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	(in thousands)
3579 Valley Centre Drive Del Mar, California		2,167	6,897	6,777		2,858	12,983	15,841	5,668	35	1999	(C)	52,375
3611 Valley Centre Drive Del Mar, California		4,184	19,352	15,868		5,259	34,145	39,404	15,193	35	2000	(C)	130,178
3661 Valley Centre Drive Del Mar, California		4,038	21,144	8,803		4,725	29,260	33,985	13,437	35	2001	(C)	129,752
3721 Valley Centre Drive Del Mar, California		4,297	18,967	5,692		4,254	24,702	28,956	7,612	35	2003	(C)	114,780
3811 Valley Centre Drive Del Mar, California		3,452	16,152	20,076		4,457	35,223	39,680	13,717	35	2000	(C)	112,067
6200 Greenwich Drive Governor Park, California		1,583	5,235	2,752		1,722	7,848	9,570	4,802	35	1999	(C)	71,000
6220 Greenwich Drive Governor Park, California		3,213	10,628	16,371		3,426	26,786	30,212	8,122	35	1997	(A)	141,214
15051 Avenue of Science I-15 Corridor, California		2,888	5,780	5,769		2,888	11,549	14,437	5,119	35	2002	(C)	70,617
15073 Avenue of Science I -15 Corridor, California		2,070	5,728	1,648		2,070	7,376	9,446	3,543	35	2002	(C)	46,759
15231 Avenue of Science I-15 Corridor, California		2,233	8,830	4,888		2,233	13,718	15,951	3,993	35	2005	(C)	65,638
15253 Avenue of Science I-15 Corridor, California		1,548	6,423	1,571		1,548	7,994	9,542	1,998	35	2005	(C)	37,437
15333 Avenue of Science I-15 Corridor, California		2,371	16,500	3,424		2,371	19,924	22,295	3,881	35	2006	(C)	78,880
15378 Avenue of Science I-15 Corridor, California		3,565	3,796	3,156		3,565	6,952	10,517	3,141	35	1998	(A)	68,910
15435 Innovation Drive I-15 Corridor, California		2,143	6,311	2,612		2,046	9,020	11,066	4,494	35	2000	(C)	49,863
15445 Innovation Drive I-15 Corridor, California		2,143	6,311	5,146		2,046	11,554	13,600	5,521	35	2000	(C)	51,500
13280 Evening Creek Drive South I-15 Corridor, California		3,701	8,398	2,937		3,701	11,335	15,036	1,733	35	2008	(C)	41,665
13290 Evening Creek Drive South I-15 Corridor, California		5,229	11,871	1,458		5,229	13,329	18,558	1,593	35	2008	(C)	61,176
13480 Evening Creek Drive North I-15 Corridor, California		7,997		41,733		7,997	41,733	49,730	6,852	35	2008	(C)	149,817
13500 Evening Creek Drive North I-15 Corridor, California		7,581	35,903	11,338		7,580	47,242	54,822	11,744	35	2004	(A)	147,533
13520 Evening Creek Drive North I-15 Corridor, California		7,581	35,903	12,376		7,580	48,280	55,860	12,818	35	2004	(A)	141,129
7525 Torrey Santa Fe 56 Corridor, California		2,348	28,035	4,060		2,348	32,095	34,443	6,488	35	2007	(C)	103,979
7535 Torrey Santa Fe 56 Corridor, California		2,950	33,808	5,991		2,950	39,799	42,749	8,306	35	2007	(C)	130,243
7545 Torrey Santa Fe 56 Corridor, California		2,950	33,708	8,117		2,950	41,825	44,775	9,330	35	2007	(C)	130,354
7555 Torrey Santa Fe 56 Corridor, California		2,287	24,916	3,712		2,287	28,628	30,915	5,757	35	2007	(C)	101,236
2355 Northside Drive Mission Valley, California		4,066	8,332	706		3,270	9,834	13,104	1,279	35	2010	(A)	53,610
2365 Northside Drive Mission Valley, California		7,359	15,257	(83	)	5,919	16,614	22,533	1,874	35	2010	(A)	91,260
2375 Northside Drive Mission Valley, California		3,947	8,146	188		3,175	9,106	12,281	1,172	35	2010	(A)	51,516
2385 Northside Drive Mission Valley, California		2,752	14,513	3,738		5,759	15,244	21,003	1,757	35	2010	(A)	88,795
2305 Historic Decatur Road Point Loma, California		5,240	22,220	435		5,240	22,655	27,895	1,621	35	2010	(A)	103,900
10020 Pacific Mesa Boulevard Sorrento Mesa, California		8,007	52,189	15,348		8,007	67,537	75,544	14,967	35	2007	(C)	318,000
4910 Directors Place Sorrento Mesa, California		2,240	13,039	6,548		2,240	19,587	21,827	1,906	35	2009	(C)	50,925
4921 Directors Place Sorrento Mesa, California		3,792	11,091	4,748		3,792	15,839	19,631	2,121	35	2008	(C)	56,136
4939 Directors Place Sorrento Mesa, California		2,225	12,698	4,359		2,198	17,084	19,282	7,021	35	2002	(C)	60,662
4955 Directors Place Sorrento Mesa, California		2,521	14,122	3,696		3,179	17,160	20,339	10,400	35	2000	(C)	76,246

F - 64

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III—REAL ESTATE AND ACCUMULATED DEPRECIATION—(Continued)

December 31, 2012

	Initial Cost						Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances		Land	Buildings and Improve- ments	Costs Capitalized Subsequent to Acquisition/ Improvement		Land	Buildings and Improve- ments	Total	Accumulated Depreciation	Deprecia- tion Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	(in thousands)
5005 Wateridge Vista Drive Sorrento Mesa, California			3,320	5,049	2,026		3,320	7,075	10,395	3,193	35	1999	(C)	61,460
5010 Wateridge Vista Drive Sorrento Mesa, California			3,786	10,767	27,132		15,620	26,065	41,685	172	35	1999	(C)	111,318
10770 Wateridge Circle Sorrento Mesa, California			4,560	26,671	184		4,560	26,855	31,415	3,307	35	2011	(A)	174,310
6055 Lusk Avenue Sorrento Mesa, California			3,935	8,008	5,919		3,942	13,920	17,862	6,209	35	1997	(A)	93,000
6260 Sequence Drive Sorrento Mesa, California			3,206	9,803	1,291		3,212	11,088	14,300	5,205	35	1997	(A)	130,536
6290 Sequence Drive Sorrento Mesa, California			2,403	7,349	4,906		2,407	12,251	14,658	6,204	35	1997	(A)	90,000
6310 Sequence Drive Sorrento Mesa, California			2,940	4,946	190		2,941	5,135	8,076	2,689	35	2000	(C)	62,415
6340 Sequence Drive Sorrento Mesa, California			2,434	7,302	9,963		2,464	17,235	19,699	8,245	35	1998	(A)	66,400
6350 Sequence Drive Sorrento Mesa, California			4,941	14,824	(4,387	)	4,922	10,456	15,378	5,633	35	1998	(A)	132,600
10390 Pacific Center Court Sorrento Mesa, California			3,267	5,779	7,500		3,267	13,279	16,546	4,481	35	2002	(C)	68,400
10394 Pacific Center Court Sorrento Mesa, California			2,696	7,134	(782	)	1,671	7,377	9,048	3,217	35	1998	(A)	59,630
10398 Pacific Center Court Sorrento Mesa, California			1,947	5,152	1,316		1,222	7,193	8,415	2,824	35	1998	(A)	43,645
10421 Pacific Center Court Sorrento Mesa, California			2,926	7,979	21,999		2,926	29,978	32,904	11,682	35	1998	(A)	75,899
10445 Pacific Center Court Sorrento Mesa, California			2,247	5,945	567		1,809	6,950	8,759	2,911	35	1998	(A)	48,709
10455 Pacific Center Court Sorrento Mesa, California			4,044	10,701	(2,251	)	3,780	8,714	12,494	3,684	35	1998	(A)	90,000
5717 Pacific Center Boulevard Sorrento Mesa, California			2,693	6,280	4,219		2,693	10,499	13,192	2,721	35	2001	(C)	67,995
4690 Executive Drive UTC, California		(6)	1,623	7,926	2,394		1,623	10,320	11,943	5,009	35	1999	(A)	47,212
9785 Towne Center Drive UTC, California			2,722	9,932	(1,077	)	2,329	9,248	11,577	3,633	35	1999	(A)	75,534
9791 Towne Center Drive UTC, California			1,814	6,622	1,121		2,217	7,340	9,557	2,883	35	1999	(A)	50,466
8101 Kaiser Boulevard Anaheim, California			2,369	6,180	2,091		2,377	8,263	10,640	4,342	35	1997	(A)	59,790
2211 Michelson Irvine, California		(9)	9,319	82,836	1,507		9,319	84,343	93,662	7,926	35	2010	(A)	271,556
111 Pacifica Irvine, California			5,165	4,653	4,254		5,166	8,906	14,072	4,975	35	1997	(A)	67,496
999 Town & Country Orange, California			7,867	9,579	219		7,867	9,798	17,665	1,110	35	2010	(A)	98,551
4100 Bohannon Drive, Menlo Park, California			4,835	15,526	(18	)	4,835	15,508	20,343	457	35	2012	(A)	46,614
4200 Bohannon Drive, Menlo Park, California			4,798	15,406	(413	)	4,798	14,993	19,791	446	35	2012	(A)	46,255
4300 Bohannon Drive, Menlo Park, California			6,527	20,958	268		6,527	21,226	27,753	589	35	2012	(A)	62,920
4400 Bohannon Drive, Menlo Park, California			4,798	15,406	551		4,798	15,957	20,755	451	35	2012	(A)	46,255
4500 Bohannon Drive, Menlo Park, California			6,527	20,957	1,041		6,527	21,998	28,525	655	35	2012	(A)	62,920
4600 Bohannon Drive, Menlo Park, California			4,798	15,406	67		4,798	15,473	20,271	363	35	2012	(A)	46,255
4700 Bohannon Drive, Menlo Park, California			6,527	20,958	821		6,527	21,779	28,306	636	35	2012	(A)	62,920
303 Second Street San Francisco, California	135,000	(10)	63,550	154,153	18,442		63,550	172,595	236,145	17,837	35	2010	(A)	740,047
100 First Street San Francisco, California			49,150	131,238	11,188		49,150	142,426	191,576	11,851	35	2010	(A)	466,490

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KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III—REAL ESTATE AND ACCUMULATED DEPRECIATION—(Continued)

December 31, 2012

	Initial Cost										Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances			Land		Buildings and Improve- ments		Costs Capitalized Subsequent to Acquisition/ Improvement			Land		Buildings and Improve- ments		Total		Accumulated Depreciation		Deprecia- tion Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	(in thousands)
250 Brannan Street San Francisco, California				7,630		22,770		1,252			7,630		24,022		31,652		2,215		35	2011	(A)	92,948
201 Third Street San Francisco, California				19,260		84,018		13,803			19,260		97,821		117,081		7,397		35	2011	(A)	332,893
301 Brannan Street San Francisco, California				5,910		22,450		1,008			5,910		23,458		29,368		1,065		35	2011	(A)	74,430
360 Third Street San Francisco, California								13,749			—		13,749		13,749		923		35	2011	(A)	(15	)
4040 Civic Center San Rafael, California				10,210		18,029		396			10,210		18,425		28,635		1,262		35	2011	(A)	130,237
599 Mathilda Sunnyvale, California				13,538		12,559		—			13,538		12,559		26,097		—		35	2012	(A)	75,810
601 108th Avenue Bellevue, Washington				—		214,095		1,222			—		215,317		215,317		13,857		35	2011	(A)	488,470
10900 NE 4th Street Bellevue, Washington	83,116		(11)	25,080		150,877		1,665			25,080		152,542		177,622		2,526		35	2012	(A)	416,755
10220 NE Points Drive Kirkland, Washington	28,384		(12)	2,554		12,080		402			2,554		12,482		15,036		830		35	2011	(A)	49,851
10230 NE Points Drive Kirkland, Washington			(12)	5,071		24,694		2,669			5,071		27,363		32,434		1,728		35	2011	(A)	98,982
10210 NE Points Drive Kirkland, Washington			(12)	4,336		24,187		892			4,336		25,079		29,415		1,583		35	2011	(A)	84,641
3933 Lake Washington Boulevard NE Kirkland, Washington			(12)	2,380		15,114		990			2,380		16,104		18,484		958		35	2011	(A)	46,450
15050 N.E. 36th Street Redmond, Washington				9,260		34,650		197			9,260		34,847		44,107		2,404		35	2010	(A)	122,103
837 N. 34th Street Lake Union, Washington				—		37,404		352			—		37,756		37,756		888		35	2012	(A)	111,580
701 N. 34th Street Lake Union, Washington	34,000		(13)	—		48,027		(140		)	—		47,887		47,887		1,172		35	2012	(A)	138,995
801 N. 34th Street Lake Union, Washington			(13)	—		58,537		(360		)	—		58,177		58,177		1,239		35	2012	(A)	169,412
17150 Von Karman Irvine, California				4,848		7,342		2,224			7,301		7,113		14,414		7,113		35	1997	(A)	(16	)
TOTAL OPERATING PROPERTIES	$	551,402		$	587,387	$	2,644,476	$	715,877		$	612,714	$	3,335,026	$	3,947,740	$	756,515				13,249,780
Undeveloped land and construction in progress(18)	2,517		(17)	521,633		90,512		197,509			521,633		288,021		809,654		—
TOTAL ALL PROPERTIES	$	553,919	(19)	$	1,109,020	$	2,734,988	$	913,386		$	1,134,347	$	3,623,047	$	4,757,394	$	756,515				13,249,780

__________________________

(1) The initial costs of buildings are depreciated over 35 years using a straight-line method of accounting; improvements capitalized subsequent to acquisition are depreciated over the shorter of the lease term or useful life, generally ranging from one to 20 years.

(2) Represents our date of construction or acquisition, or our predecessor, the Kilroy Group.

(3) Includes square footage from our stabilized portfolio.

(4) These costs represent infrastructure costs incurred in 1989. During the third quarter of 2009, we exercised our option to terminate the ground lease at Kilroy Airport Center, Phase IV in Long Beach, California. We had previously leased this land, which is adjacent to our Office Properties at Kilroy Airport Center, Long Beach, for potential future development opportunities.

(5) These properties secure a $11.2 million mortgage note.

(6) These properties secure a $68.6 million mortgage note.

(7) This property secures a $40.5 million mortgage note.

(8) This property secures a $53.6 million mortgage note.

(9) These properties secure a $97.0 million mortgage note.

(10) This property secures a $135.0 million mortgage note.

(11) This property secures a $83.1 million mortgage note.

(12) These properties secure a $28.4 million mortgage note.

(13) These properties secure a $34.0 million mortgage note.

(14) Excludes approximately 98,000 rentable square feet as this building was under redevelopment at December 31, 2012. A portion of the cost basis is included in "Undeveloped land and construction in progress" below.

(15) Excludes approximately 410,000 rentable square feet as this building was under redevelopment at December 31, 2012. The cost basis is included in "Undeveloped land and construction in progress" below.

(16) During the fourth quarter of 2011, we completed demolition of the industrial building on this site to prepare for the possible sale of the land, since we successfully obtained entitlements to reposition this site for residential use. Our ultimate decision to sell this site and the timing of any potential future sale will depend upon market conditions and other factors.

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(17) Represents the principal balance of the public facility bonds (the “Bonds”), the proceeds from which were used to finance infrastructure improvements on one of our undeveloped land parcels. The Bonds are secured by property tax payments.

(18) Includes initial cost of 9455 Towne Center Drive, which was transferred to the future development portfolio and is included in construction in progress during the year ended December 31, 2012.

(19) Represents gross aggregate principal amount before the effect of the unamortized premium of approximately $7.2 million as of December 31, 2012.

The aggregate gross cost of property included above for federal income tax purposes approximated $4.1 billion as of December 31, 2012.

The following table reconciles the historical cost of total real estate held for investment from January 1, 2010 to December 31, 2012:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Total real estate held for investment, beginning of year	$	3,798,690		$	3,216,871		$	2,520,083
Additions during period:
Acquisitions	1,023,384			617,923			643,776
Improvements, etc.	207,345			84,736			86,754
Total additions during period	1,230,729			702,659			730,530
Deductions during period:
Cost of real estate sold	(264,533		)	(21,052		)	(17,456		)
Properties held for sale	—			(89,937		)	—
Other (1)	(7,492		)	(9,851		)	(16,286		)
Total deductions during period	(272,025		)	(120,840		)	(33,742		)
Total real estate held for investment, end of year	$	4,757,394		$	3,798,690		$	3,216,871

__________________________

(1) Related to the redevelopment property transferred to construction in progress during the year.

The following table reconciles the accumulated depreciation from January 1, 2010 to December 31, 2012:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Accumulated depreciation, beginning of year	$	742,503		$	672,429		$	605,976
Additions during period:
Depreciation of real estate	125,906			105,982			86,288
Total additions during period	125,906			105,982			86,288
Deductions during period:
Write-offs due to sale	(109,797		)	(11,152		)	(3,549		)
Properties held for sale	—			(14,905		)	—
Other (1)	(2,097		)	(9,851		)	(16,286		)
Total deductions during period	(111,894		)	(35,908		)	(19,835		)
Accumulated depreciation, end of year	$	756,515		$	742,503		$	672,429

__________________________

(1) Related to the redevelopment property transferred to construction in progress during the year.

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EXHIBIT INDEX

Exhibit Number	Description
3.(i)1	Kilroy Realty Corporation Articles of Restatement (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2012)
3.(i)2	Certificate of Limited Partnership of Kilroy Realty, L.P. (previously filed by Kilroy Realty, L.P., as an exhibit to the General Form for Registration of Securities on Form 10 as filed with the Securities and Exchange Commission on August 18, 2010)
3.(i)3	Amendment to the Certificate of Limited Partnership of Kilroy Realty, L.P. (previously filed by Kilroy Realty, L.P., as an exhibit to the General Form for Registration of Securities on Form 10 as filed with the Securities and Exchange Commission on August 18, 2010)
3.(i)4	Articles Supplementary designating Kilroy Realty Corporation's 6.375% Series H Cumulative Redeemable Preferred Stock (previously filed by Kilroy Realty Corporation on Form 8-A as filed with the Securities and Exchange Commission on August 10, 2012)
3.(ii).1	Second Amended and Restated Bylaws of Kilroy Realty Corporation (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on December 12, 2008)
3.(ii).2	Amendment No. 1 to Second Amended and Restated Bylaws of Kilroy Realty Corporation (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on May 27, 2009)
3.(ii).3	Seventh Amended and Restated Agreement of Limited Partnership of Kilroy Realty, L.P. dated as of August 15, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on August 17, 2012)
4.1	Kilroy Realty Corporation Form of Certificate for Common Stock (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
4.2	Specimen Certificate for Kilroy Realty Corporation's 6.875% Series G Cumulative Redeemable Preferred Stock (previously filed by Kilroy Realty Corporation on Form 8-A as filed with the Securities and Exchange Commission on March 22, 2012)
4.3	Specimen Certificate for Kilroy Realty Corporation's 6.375% Series H Cumulative Redeemable Preferred Stock (previously filed by Kilroy Realty Corporation on Form 8-A as filed with the Securities and Exchange Commission on August 10, 2012)
4.4	Kilroy Realty Corporation Form of Stock Option Grant Notice and Stock Option Agreement (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on February 24, 2012)
4.5	Registration Rights Agreement dated January 31, 1997 (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
4.6	Registration Rights Agreement dated as of October 31, 1997 (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K/A as filed with the Securities and Exchange Commission on December 19, 1997)
4.7	Registration Rights Agreement dated as of October 6, 2000 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2000)
4.8	The Company is party to agreements in connection with long-term debt obligations, none of which individually exceeds ten percent of the total assets of the Company on a consolidated basis. Pursuant to Item 601(b)(4)(iii)(A) of Regulation S-K, the Company agrees to furnish copies of these agreements to the Commission upon request
4.9	Registration Rights Agreement dated as of July 31, 2012 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2012)
4.10	Note and Guarantee Agreement dated August 4, 2004 by and between Kilroy Realty, L.P. and Kilroy Realty Corporation and the purchasers whose names appear in the acceptance form at the end of the Note and Guarantee Agreement (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on August 11, 2004)
4.11	Form of 6.45% Series B Guaranteed Senior Note due 2014 (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on August 11, 2004)
4.12†	Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-8 filed with the Securities and Exchange Commission on June 28, 2006)
4.13†	Amendment to Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2006)

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Exhibit Number	Description
4.14†	Second Amendment to Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended March 31, 2007)
4.15†	Third Amendment to Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on May 27, 2009)
4.16†	Fourth Amendment to Kilroy Realty 2006 Incentive Award Plan (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S−8 as filed with the Securities and Exchange Commission on June 11, 2010)
4.17	Form of Restricted Stock Award Agreement (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on February 8, 2007)
4.18	Indenture, dated as of November 20, 2009, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee, including the form of 4.25% Exchangeable Senior Notes due 2014 and the form of related guarantee (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
4.19	Registration Rights Agreement, dated November 20, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation, J.P. Morgan Securities Inc., and Merrill Lynch, Pierce, Fenner & Smith Incorporated (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
4.20	Form of Certificate for Partnership Units of Kilroy Realty, L.P. (previously filed by Kilroy Realty, L.P., as an exhibit to the General Form for Registration of Securities on Form 10 as filed with the Securities and Exchange Commission on August 18, 2010)
4.21	Indenture, dated May 24, 2010, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee, including the form of 6.625% Senior Notes due 2020 and the form of the related guarantee (previously filed by Kilroy Realty Corporation as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on May 25, 2010)
4.22	Registration Rights Agreement, dated May 24, 2010, among Kilroy Realty, L.P., Kilroy Realty Corporation, J.P. Morgan Securities Inc., Banc of America Securities LLC and Barclays Capital Inc. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on May 25, 2010)
4.23	Indenture, dated November 3, 2010, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee, including the form of 5.000% Senior Notes due 2015 and the form of related guarantee (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P., as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on November 4, 2010)
4.24	Indenture, dated March 1, 2011, by and among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee(previously filed by Kilroy Corporation and Kilroy Realty, L.P. as an exhibit the Registration Statement on Form S-3 as filed with the Securities and Exchange Commission on March 1, 2011)
4.25	Supplemental Indenture, dated July 5, 2011, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee (previously filed by Kilroy Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 6, 2011)
4.26	Officers' Certificate pursuant to Sections 101, 201, 301 and 303 of the Indenture dated March 1, 2011, among Kilroy Realty, L.P., as issuer, Kilroy Realty Corporation, as guarantor, and U.S. Bank National Association, as trustee, establishing a series of securities entitled “4.800% Notes due 2018,” including the form of 4.800% Notes due 2018 and the form of related guarantee (previously filed by Kilroy Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 6, 2011)
4.27	Registration Rights Agreement dated as of July 31, 2012 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2012)
10.1	Pledge Agreement by and among Kilroy Realty, L.P., John B. Kilroy, Sr., John B. Kilroy, Jr. and Kilroy Industries (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
10.2†	1997 Stock Option and Incentive Plan of the Registrant and Kilroy Realty, L.P. (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
10.3	Lease Agreement dated January 24, 1989 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase I (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 2 to Form S-11 (No. 333-15553))

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Exhibit Number	Description
10.4	First Amendment to Lease Agreement dated December 28, 1990 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase I (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 2 to Form S-11 (No. 333-15553))
10.5	Lease Agreement dated July 17, 1985 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase III (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.6	Lease Agreement dated December 30, 1988 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase II (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.7	First Amendment to Lease dated January 24, 1989 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase III (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.8	Second Amendment to Lease Agreement dated December 28, 1990 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase III (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.9	First Amendment to Lease Agreement dated December 28, 1990 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase II (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.10	Third Amendment to Lease Agreement dated October 10, 1994 by and between Kilroy Long Beach Associates and the City of Long Beach for Kilroy Long Beach Phase III (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.11	Development Agreement by and between Kilroy Long Beach Associates and the City of Long Beach (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.12	Amendment No. 1 to Development Agreement by and between Kilroy Long Beach Associates and the City of Long Beach (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Form S-11 (No. 333-15553))
10.13†	Noncompetition Agreement by and between the Registrant and John B. Kilroy, Sr. (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
10.14†	Noncompetition Agreement by and between the Registrant and John B. Kilroy, Jr. (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 3 to Form S-11 (No. 333-15553))
10.15	License Agreement by and among the Registrant and the other persons named therein (previously filed by Kilroy Realty Corporation as an exhibit to the Registration Statement on Amendment No. 4 to Form S-11 (No. 333-15553))
10.16	Contribution Agreement dated October 21, 1997 by and between Kilroy Realty, L.P. and Kilroy Realty Corporation and The Allen Group and the Allens (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 21, 1997)
10.17	Amendment to the Contribution Agreement dated October 14, 1998 by and between Kilroy Realty, L.P. and Kilroy Realty Corporation and The Allen Group and the Allens dated October 21, 1997 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended September 30, 1998)
10.18†	Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Jeffrey C. Hawken effective as of January 1, 2007 (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on March 22, 2007)
10.19†	Amendment No. 1 to Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Jeffrey C. Hawken effective as of December 31, 2009 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2008)
10.20	Amendment to letter confirmation dated April 4, 2007, among Kilroy Realty, L.P., Kilroy Realty Corporation and JPMorgan Chase Bank, National Association, London Branch (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on April 11, 2007)
10.21	Amendment to letter confirmation dated April 4, 2007, among Kilroy Realty, L.P., Kilroy Realty Corporation and Bank of America, N.A. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on April 11, 2007)
10.22†	Kilroy Realty Corporation 2007 Deferred Compensation Plan (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2007)

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Exhibit Number	Description
10.23†	Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Tyler H. Rose effective as of January 1, 2007 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2007)
10.24†	Amendment No. 1 to Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Tyler H. Rose effective as of December 31, 2009 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2008)
10.25†	Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Heidi Roth effective as of January 1, 2007 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-Q for the quarter ended June 30, 2007)
10.26†	Amendment No. 1 to Employment Agreement by and among Kilroy Realty Corporation, Kilroy Realty, L.P. and Heidi Roth effective as of December 31, 2009 (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2008)
10.27†	Kilroy Realty Corporation Stock Award Deferral Program (previously filed by Kilroy Realty Corporation as an exhibit to Form 8-K as filed with the Securities and Exchange Commission on January 2, 2008)
10.28	Letter confirmation dated November 16, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation and JPMorgan Chase Bank, National Association, London Branch (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
10.29	Letter confirmation dated November 16, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation and Bank of America, N.A. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
10.30	Letter confirmation dated November 20, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation and JPMorgan Chase Bank, National Association, London Branch (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
10.31	Letter confirmation dated November 20, 2009, among Kilroy Realty, L.P., Kilroy Realty Corporation and Bank of America, N.A. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on November 25, 2009)
10.32†	Form of Indemnification Agreement of Kilroy Realty Corporation with certain officers and directors (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2009)
10.33†	Separation Agreement and Release dated December 16, 2009 by and between Richard E. Moran Jr., Kilroy Realty, L.P. and Kilroy Realty Corporation (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2009)
10.34	Deed of Trust and Security Agreement dated January 26, 2010 between Kilroy Realty, L.P. and The Northwestern Mutual Life Insurance Company; related Promissory Note dated January 26, 2010 for $71 million payable to The Northwestern Mutual Life Insurance Company; and related Guarantee of Recourse Obligations dated January 26, 2010 by Kilroy Realty Corporation (previously filed by Kilroy Realty Corporation as an exhibit on Form 10-K for the year ended December 31, 2009)
10.35	Agreement of Purchase and Sale and Joint Escrow Instructions dated April 12, 2010 by and between Kilroy Realty, L.P, a Delaware limited partnership, and MEPT 303 Second Street LLC, a Delaware limited liability company (previously filed by Kilroy Realty Corporation as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on May 27, 2010)
10.36	First Amendment to Agreement of Purchase and Sale and Joint Escrow Instructions dated May 21, 2010 by and between Kilroy Realty, L.P, a Delaware limited partnership, and MEPT 303 Second Street LLC, a Delaware limited liability company (previously filed by Kilroy Realty Corporation as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on May 27, 2010)
10.37	Promissory Note dated January 12, 2011, executed by Kilroy Realty 303, LLC (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on January 13, 2011)
10.38	Deed of Trust, Security Agreement and Fixture Filing dated January 12, 2011, executed by Kilroy Realty 303, LLC (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on January 13, 2011)
10.39	Guaranty dated January 12, 2011, executed by Kilroy Realty, L.P. (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P. as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on January 13, 2011)
10.40	Unsecured Indemnity Agreement dated January 12, 2011, executed by Kilroy Realty 303, LLC (previously filed by Kilroy Realty Corporation and Kilroy Realty, L.P. as an exhibit on Form 8−K as filed with the Securities and Exchange Commission on January 13, 2011)

F - 71

Exhibit Number	Description
10.41	Sales Agreement, dated July 25, 2011, between Kilroy Realty Corporation, Kilroy Realty, LP. and Barclays Capital Inc. (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 28, 2011)
10.42	Sales Agreement, dated July 25, 2011, between Kilroy Realty Corporation, Kilroy Realty, LP. and Wells Fargo Securities, LLC (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 28, 2011)
10.43	Sales Agreement, dated July 25, 2011, between Kilroy Realty Corporation, Kilroy Realty, LP. and Merrill Lynch, Pierce, Fenner & Smith Incorporated (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 28, 2011)
10.44	Sales Agreement, dated July 25, 2011, between Kilroy Realty Corporation, Kilroy Realty, LP. and J.P. Morgan Securities LLC (previously filed by Kilroy Realty Corporation as an exhibit on Form 8-K as filed with the Securities and Exchange Commission on July 28, 2011)
10.45†	Amended and Restated Employment Agreement by and between Kilroy Realty Corporation, Kilroy Realty, L.P. and John B. Kilroy, Jr. (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on April 4, 2012)
10.46†	Noncompetition Agreement by and between Kilroy Realty Corporation, Kilroy Realty, L.P. and John B. Kilroy, Jr. (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on April 4, 2012)
10.47	Term Loan Agreement dated March 29, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on April 2, 2012)
10.48*	First Amendment to Term Loan Agreement dated November 28, 2012
10.49	Guaranty of Payment of Kilroy Realty Corporation dated March 29, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on April 2, 2012)
10.50	Promissory Note, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.51	Loan Agreement dated June 28, 2012, by and between KR MML 12701, LLC and Massachusetts Mutual Life Insurance Company (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.52	Deed of Trust, Assignment of Leases and Rents, Security Agreement and Fixture Filing (Irvine) for 2211 Michelson Drive, Irvine, California, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.53	Deed of Trust, Assignment of Leases and Rents, Security Agreement and Fixture Filing (Santa Monica) for 2100-2110 Colorado Avenue, Santa Monica, California, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.54	Recourse Guaranty Agreement, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.55	Environmental Indemnification Agreement, dated June 28, 2012 (previously filed by Kilroy Realty Corporation on Form 8-K as filed with the Securities and Exchange Commission on July 5, 2012)
10.56*	Amended and Restated Revolving Credit Agreement dated November 28, 2012
10.57*	Amended and Restated Guaranty of Payment dated November 28, 2012
12.1*	Statement of Computation of Consolidated Ratio of Earnings to Fixed Charges and Consolidated Ratio of Earnings to Combined Fixed Charges and Preferred Dividends of Kilroy Realty Corporation
12.2*	Statement of Computation of Consolidated Ratio of Earnings to Fixed Charges of Kilroy Realty, L.P.
21.1*	List of Subsidiaries of Kilroy Realty Corporation
21.2*	List of Subsidiaries of Kilroy Realty, L.P.
23.1*	Consent of Deloitte & Touche LLP for Kilroy Realty Corporation
23.2*	Consent of Deloitte & Touche LLP for Kilroy Realty, L.P.
24.1*	Power of Attorney (included on the signature page of this Form 10-K)
31.1*	Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer of Kilroy Realty Corporation
31.2*	Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer of Kilroy Realty Corporation
31.3*	Rule 13a-14(a)/15d-14(a) Certification of Chief Executive Officer of Kilroy Realty, L.P.
31.4*	Rule 13a-14(a)/15d-14(a) Certification of Chief Financial Officer of Kilroy Realty, L.P.
32.1*	Section 1350 Certification of Chief Executive Officer of Kilroy Realty Corporation

F - 72

Exhibit Number	Description
32.2*	Section 1350 Certification of Chief Financial Officer of Kilroy Realty Corporation
32.3*	Section 1350 Certification of Chief Executive Officer of Kilroy Realty, L.P.
32.4*	Section 1350 Certification of Chief Financial Officer of Kilroy Realty, L.P.
101.1	The following Kilroy Realty Corporation and Kilroy Realty, L.P. financial information for the year ended December 31, 2012, formatted in XBRL (eXtensible Business Reporting Language): (i) Consolidated Balance Sheets, (ii) Consolidated Statements of Income, (iii) Consolidated Statements of Changes in Equity, (iv) Consolidated Statements of Capital, (v) Consolidated Statements of Cash Flows and (vi) Notes to the Consolidated Financial Statements. (1)

____________________

* Filed herewith

† Management contract or compensatory plan or arrangement.

(1) Pursuant to Rule 406T of Regulation S−T, these interactive data files are deemed not filed or part of a registration statement or prospectus for purposes of Sections 11 or 12 of the Securities Act of 1933 or Section 18 of the Securities Exchange Act of 1934 and otherwise are not subject to liability under these sections.

F - 73

EX-10.48

Exhibit 10.48

AMENDMENT NO. 1 TO CREDIT AGREEMENT

Dated as of NOVEMBER 28, 2012

by and among

KILROY REALTY, L.P.,

as Borrower,

JPMORGAN CHASE BANK, N.A.,

as Administrative Agent

AND

THE FINANCIAL INSTITUTIONS PARTY HERETO

as Banks

AMENDMENT NO. 1 TO CREDIT AGREEMENT

This AMENDMENT NO. 1 TO CREDIT AGREEMENT, dated as of November 28, 2012 (this “Amendment No. 1”), is by and among KILROY REALTY, L.P., a Delaware limited partnership (“Borrower”), each of the financial institutions party to the Credit Agreement defined below (collectively, the “Banks” and individually a “Bank”) and JPMORGAN CHASE BANK, N.A., as Administrative Agent (the “Administrative Agent”). Reference is made to that certain Credit Agreement, dated as of March 29, 2012 (the “Credit Agreement”), by and among the Borrower, the Banks referenced therein and the Administrative Agent. Capitalized terms used herein without definition shall have the same meanings as set forth in the Credit Agreement, as amended hereby.

RECITALS

WHEREAS, the Borrower has requested that the Banks make certain amendments to the Credit Agreement, and the Banks are willing to make such changes as set forth herein;

NOW, THEREFORE, in consideration of the premises and the agreements, provisions and covenants herein contained, the parties hereto agree as follows:

SECTION 1. AMENDMENTS TO Credit Agreement. As of the Amendment Effective Date (as defined in Section 3 hereof), the Credit Agreement is hereby amended as follows:

(a)Section 1.1 is amended by adding the following new definitions of “Affiliate”, “Change in Law”, “Control”, “Material Subsidiary”, “Other Connection Taxes”, “Participant Register”, and “Regulatory Change” in the proper alphabetical order:

“'Affiliate” means, with respect to a specified Person, another Person that directly, or indirectly through one or more intermediaries, Controls or is Controlled by or is under common Control with the Person specified. In no event shall (x) the Administrative Agent or any Bank or (y) any other Person that is engaged in the business of making commercial loans (including term loans) in the ordinary course of business and for which the General Partner or the Borrower does not, directly or indirectly, possess the power to cause the direction of the investment policies of such Person be deemed to be an Affiliate of the Borrower.

“Change in Law” has the meaning set forth in Section 8.3.

“Control” means the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of a Person, whether through the ability to exercise voting power, by contract or otherwise. “Controlling” and “Controlled” have meanings correlative thereto.

“MaterialSubsidiary” means any Subsidiary of the Borrower and/or the General Partner to which 10% or more of Total Asset Value is attributable.

“Other Connection Taxes” means, with respect to the Administrative Agent and any Bank, Taxes imposed as a result of a present or former connection between such Administrative Agent or Bank and the jurisdiction imposing such Tax (other than connections arising from such Administrative Agent or Bank having executed, delivered, become a party to, performed its obligations under, received payments under, received or perfected a security interest under, engaged in any other transaction pursuant to or enforced any Loan Document, or sold or assigned an interest in any Loan or Loan Document).

“Participant Register” has the meaning set forth in clause (g) of Section 9.6.

“Regulatory Change” has the meaning set forth in Section 8.3(a).”

(b)The definition of “Base Rate” in Section 1.1 is amended and restated in its entirety to read as follows:

“Base Rate” means, for any day, a rate per annum equal to the highest of (i) the Prime Rate, (ii) the Federal Funds Rate +.50% and (iii) one-month London Interbank Offered Rate (determined as though the interest period commenced as of the date of determination) + 1%. Any change in the Base Rate due to a change in the Prime Rate, the Federal Funds Rate or the London Interbank Offered Rate shall be effective from and including the effective date of such change in the Prime Rate, the Federal Funds Rate or the London Interbank Offered Rate, respectively.

(c)The definition of “FATCA” in Section 1.1 is amended and restated in its entirety to read as follows:

“'FATCA” means Sections 1471 through 1474 of the Internal Revenue Code, as of the date of this Agreement (or any amended or successor version that is substantively comparable and not materially more onerous to comply with), any current or future regulations or official interpretations thereof and any agreements entered into pursuant to Section 1471(b)(1) of the Code.”

(d)The definition of “Total Asset Value” in Section 1.1 is amended by inserting the following proviso at the end of such definition immediately before the period:

“; provided that for purposes of determining Total Asset Value, the aggregate contributions to Total Asset Value from investments in land and Development Properties and from the Borrower's and the General Partner's interests in any joint venture, whether consolidated or unconsolidated, shall not exceed 30% of Total Asset Value.”

(e)The definition of “Unencumbered Asset Pool Properties” in Section 1.1 is amended and restated in its entirety to read as follows:

“'Unencumbered Asset Pool Properties” means, as of any date, the Real Property Assets listed in Exhibit B and Exhibit C attached hereto and made a part hereof, together with all Real Property Assets which have become part of the Unencumbered Asset Pool Properties as of such date, each of which is:

(i)located in the United States;

(ii) 100% owned in fee (or leasehold pursuant to a Financeable Ground Lease in the case of assets listed on Exhibit C as leaseholds) by (x) the Borrower or (y) a wholly-owned direct or indirect Subsidiary of the Borrower and/or the General Partner that is not liable for any Debt and is not the subject of a Bankruptcy Event;

(iii) either a completed industrial property or primarily a completed office property which may have secondary uses or a Development Property which will be either an industrial or office property or a mortgage note;

(iv) not subject to any Lien (other than Permitted Liens);

(v) in the case of a Real Property Asset owned or leased by a wholly-owned Subsidiary, not subject to any agreement or arrangement by which the direct or indirect equity interests in such Subsidiary are subject to any Lien (other than Permitted Liens); and

(vi) not subject to any agreement or arrangement that prohibits or restricts the creation or assumption of any Lien on the assets of, or equity interests in, the Borrower or Subsidiary that owns or leases such Real Property Asset.

(f)The definition of “Unencumbered Asset Pool Properties Value” in Section 1.1 is amended by inserting the following words on the fifteenth line of such definition, immediately before the words “divided by (y) the FMV Cap Rate”:

“but less reserves for Capital Expenditures of (A) $0.30 per square foot per annum for each Unencumbered Asset Pool Property that is an office property, and (B) $0.15 per square foot per annum for each Unencumbered Asset Pool Property that is an industrial property,”

(g)The definition of “London Interbank Offered Rate” set forth in the Section 2.7(b) of the Credit Agreement is amended by inserting the following words in the second line of such definition after the words “British Bankers Association LIBOR Rate”:

“, or the successor thereto if the British Bankers Association is no longer making the LIBOR Rate available”

(h)Section 2.9(a) of the Credit Agreement is amended and restated in its entirety to read as follows:

“(a)The Borrower shall have one (1) option to extend the Original Maturity Date to the Extended Maturity Date, which shall become effective upon the date (the “Extension Effective Date”) that the following conditions are satisfied:

(i)the Borrower shall have delivered to the Administrative Agent a written request for such extension, which request must be delivered at least thirty (30) days, and cannot be delivered more than one hundred twenty (120) days, prior to the Original Maturity Date (and the Administrative Agent shall forward to each Bank a copy of such request promptly upon receipt thereof);

(ii)no Default or Event of Default shall exist on the Extension Effective Date; and

(iii)the Borrower shall have paid the Extension Fee payable under Section 2.8(a).”

(i)Section 4.4 of the Credit Agreement is amended and restated in its entirety to read as follows:

Section 4.4Financial Information.

(a)The audited consolidated balance sheets and statements of income of the Borrower and the General Partner as of December 31, 2011 and the unaudited balance sheets and statements of income of the Borrower and the General Partner as of September 30, 2012 fairly present, in conformity with GAAP, the consolidated financial position of the Borrower and the General Partner as of such date and their consolidated results of operations for such fiscal periods.

(b)Since December 31, 2011, except as disclosed in public filings with the Securities and Exchange Commission (i) there has been no material adverse change in the business, financial position or results of operations of the Borrower or the General Partner

and (ii) except as previously disclosed to the Administrative Agent and to the Banks, neither the Borrower nor the General Partner has incurred any material indebtedness or guaranty.

(j)Section 5.9(a) of the Credit Agreement is amended and restated in its entirety to read as follows:

“(a) The Borrower shall not enter into any merger or consolidation, unless the Borrower is the surviving entity, or liquidate, wind-up or dissolve (or suffer any liquidation or dissolution), discontinue its business or convey, lease, sell, transfer or otherwise dispose of, in on transaction or series of transactions, any substantial part of the business or property of the Borrower and its Subsidiaries, taken as a whole, whether now or hereafter acquired, hold an interest in any subsidiary which is not controlled by the Borrower or the General Partner or enter into other business lines, without the prior written consent of the Administrative Agent, which consent shall not be given unless the Required Banks so consent.

(k)Section 5.16 and Section 5.17 of the Credit Agreement are deleted in their entirety.

(l)Sections 6.1(e), (f), (g) and (m) of the Credit Agreement are each amended and restated in their entirety to read as follows:

“(e)the Borrower, the General Partner or any Material Subsidiary shall default in the payment when due (whether by scheduled maturity, required prepayment, acceleration, demand or otherwise) of any amount owing in respect of any Recourse Debt or Debt guaranteed by the Borrower, the General Partner or such Material Subsidiary (other than the Obligations) in an aggregate principal amount of more than $50,000,000 and such default shall continue beyond the giving of any required notice and the expiration of any applicable grace period (as the same may be extended by the applicable lender) and such default shall not be waived by the applicable lender (which waiver shall serve to reinstate the applicable loan), or the Borrower, the General Partner or any Material Subsidiary shall default in the performance or observance of any obligation or condition with respect to any such Debt or any other event shall occur or condition exist beyond the giving of any required notice and the expiration of any applicable grace period (as the same may be extended by the applicable lender), if in any such case as a result of such default, event or condition, the lender thereof (including the holder or holders thereof, or any trustee or agent for such holders) of any such Debt shall accelerate the maturity of any such Debt or shall be permitted (without any further requirement of notice or lapse of time), to accelerate the maturity of any such Debt and such default shall not be waived by the applicable lender (which waiver shall serve to reinstate the applicable loan), or any such Debt shall become or be declared to be due and payable prior to its stated maturity other than as a result of a regularly scheduled payment;

(f)the Borrower, the General Partner or any Material Subsidiary shall commence a voluntary case or other proceeding seeking liquidation, reorganization or other relief with respect to itself or its debts under any bankruptcy, insolvency or other similar law now or hereafter in effect or seeking the appointment of a trustee, receiver, liquidator, custodian or other similar official of it or any substantial part of its property, or shall consent to any such relief or to the appointment of or taking possession by any such official in an involuntary case or other proceeding commenced against it, or shall make a general assignment for the benefit of creditors, or shall fail generally to pay its debts as they become due, or shall take any corporate action to authorize any of the foregoing;

(g)an involuntary case or other proceeding shall be commenced against the Borrower, the General Partner or any Material Subsidiary seeking liquidation, reorganization or other relief with respect to it or its debts under any bankruptcy, insolvency or other similar law now or hereafter in effect or seeking the appointment of a trustee, receiver, liquidator, custodian or other similar official of it or any substantial part of its property, and such involuntary case or other proceeding shall remain undismissed and unstayed for a period of 60 days; or an order for relief shall be entered against the Borrower, the General Partner or any Material Subsidiary under the federal bankruptcy laws as now or hereafter in effect;

(m)(i) during any consecutive twenty-four month period commencing on or after the date hereof, individuals who at the beginning of such period constituted the Board of Directors of the General Partner of the Borrower (together with any new directors whose election by the Board of Directors or whose nomination for election by the General Partner stockholders was approved by a vote of at least a majority of the members of the Board of Directors then in the office who either were members of the Board of Directors at the beginning of such period or whose election or nomination for election was previously so approved) cease for any reason to constitute a majority of the members of the Board of Directors then in office, except for any such change resulting from (x) death or disability of any such member, (y) satisfaction of any requirement for the majority of the members of the Board of Directors of the General Partner to qualify under applicable law as independent directors, or (z) the replacement of any member of the Board of Directors who is an officer or employee of the General Partner with any other officer or employee of the General Partner or its Affiliate; or (ii) the acquisition of ownership, directly or indirectly, beneficially or of record, by any Person or group (within the meaning of the Securities Exchange Act of 1934 and the rules of the Securities and Exchange Commission thereunder as in effect on the date hereof) of equity interests representing more than thirty-five percent (35%) of the aggregate ordinary voting power represented by the issued and outstanding equity interests of the General Partner;”

(m)Sections 7.5 and 7.6 of the Credit Agreement are amended and restated in their entirety to read as follows:

“Section 7.5Liability of Administrative Agent. Neither the Administrative Agent nor any of its Affiliates nor any of their respective directors, officers, agents or employees shall be liable for any action taken or not taken by it in connection herewith (i) with the consent or at the request of the Required Banks or, where required by the terms of this Agreement, all of the Banks, or (ii) in the absence of its own gross negligence or willful misconduct. Except as expressly set forth herein, the Administrative Agent shall not have any duty to disclose, and shall not be liable for the failure to disclose, any information relating to the Borrower or any of its Subsidiaries that is communicated to or obtained by the bank serving as Administrative Agent or any of its Affiliates in any capacity. The Administrative Agent shall be deemed not to have knowledge of any Default (other than a Default under Section 6.1(a) with respect to the payment of principal or interest) unless and until written notice thereof is given to the Administrative Agent by the Borrower or a Bank. Neither the Administrative Agent nor any of its directors, officers, agents or employees shall be responsible for or have any duty to ascertain, inquire into or verify (i) any statement, warranty or representation made in connection with this Agreement or any borrowing hereunder or the contents of any report or certificate delivered hereunder; (ii) the performance or observance of any of the covenants or agreements of the Borrower; (iii) the satisfaction of any condition specified in Article III, except receipt of items required to be delivered to the Administrative Agent; or (iv) the validity,

effectiveness or genuineness of this Agreement, the other Loan Documents or any other instrument or writing furnished in connection herewith. The Administrative Agent shall not incur any liability by acting in reliance upon any notice, consent, certificate, statement, or other writing (which may be sent by electronic means) believed by it in good faith to be genuine or to be signed by the proper party or parties. The Administrative Agent also may rely upon any statement made to it orally or by telephone and believed by it in good faith to be made by the proper Person, and shall not incur any liability for relying thereon.

Section 7.6Indemnification. Each Bank shall, ratably in accordance with its aggregate Loans and unfunded Commitments, indemnify the Administrative Agent, its Affiliates and their respective directors, officers, agents and employees (to the extent not reimbursed by the Borrower) against any cost, expense (including counsel fees and disbursements), claim, demand, action, loss or liability (except such as result from such indemnitees' gross negligence or willful misconduct as finally determined by a court of competent jurisdiction) that such indemnitees may suffer or incur as a result of, or in connection with, the Administrative Agent's capacity as Administrative Agent in connection with this Agreement, the other Loan Documents or any action taken or omitted by such indemnitees in accordance with this Agreement, including any amounts that the Borrower fails to pay under Section 9.3(a).”

(n)Section 8.3(a) of the Credit Agreement is amended by inserting the words (“Change in Law”) on the fifth line thereof immediately after the words “or administration thereof”.

(o)Section 8.3(b) of the Credit Agreement is amended by replacing the words “capital adequacy” on the second, fifth and eleventh lines thereof with the words “capital or liquidity requirements”.

(p)Section 8.4 of the Credit Agreement is amended and restated in its entirety to read as follows:

“Section 8.4Taxes.

(a)Any and all payments by the Borrower to or for the account of any Bank or the Administrative Agent hereunder or under any other Loan Document shall be made free and clear of and without deduction for any and all present or future taxes, duties, levies, imposts, deductions, charges or withholdings, and all liabilities, including, without limitation, penalties, interest and expenses, with respect thereto, excluding, (i) in the case of each Bank and the Administrative Agent, taxes imposed on its net income (however denominated), franchise taxes and branch profits taxes, in each case (a) imposed on it, by the jurisdiction under the laws of which such Bank or the Administrative Agent (as the case may be) is organized, or in which it has its principal office or any political subdivision thereof, or (b) that are Other Connection Taxes, (ii) in the case of each Bank, taxes imposed on its net income (however denominated), and franchise or similar taxes imposed on it, by the jurisdiction of such Bank's Applicable Lending Office or any political subdivision thereof (and, if different from the jurisdiction of such Bank's Applicable Lending Office, the jurisdiction of the domicile of its Loans either established by the Bank pursuant to Section 9.14 or determined by the applicable taxing authorities), and (iii) any U.S. federal withholding taxes imposed under FATCA (all such non-excluded taxes, duties, levies, imposts, deductions, charges, withholdings and liabilities being hereinafter referred to as “Taxes”). If the Borrower shall be required by law to deduct any Taxes from or in respect of any sum payable hereunder or under any Note or participation therein to any Bank or the Administrative Agent, (i) the sum payable shall be increased as necessary so that after making all required deductions (including

deductions applicable to additional sums payable under this Section 8.4) such Bank or the Administrative Agent (as the case may be) receives an amount equal to the sum it would have received had no such deductions been made, (ii) the Borrower shall make such deductions, (iii) the Borrower shall pay the full amount deducted to the relevant taxation authority or other authority in accordance with applicable law and (iv) the Borrower shall furnish to the Administrative Agent, at its address referred to in Section 9.1, the original or a certified copy of a receipt evidencing payment thereof.

(b)In addition, the Borrower agrees to pay any present or future stamp, court or documentary, intangible, recording, filing or similar taxes, or charges or similar levies which arise from any payment made hereunder or under any Note or participation therein or from the execution, delivery, performance, enforcement or registration of, or otherwise with respect to, this Agreement or any Note or participation therein (hereinafter referred to as “Other Taxes”).

(c)The Borrower agrees to indemnify each Bank and the Administrative Agent for the full amount of Taxes or Other Taxes (including, without limitation, any Taxes or Other Taxes imposed on amounts payable under this Section 8.4) payable or paid by such Bank or the Administrative Agent (as the case may be) or required to be deducted from a payment to such Bank or Administrative Agent and any liability (including penalties, interest and expenses) arising therefrom or with respect thereto (whether or not such Taxes or Other Taxes were correctly or legally imposed or asserted by the relevant Governmental Authority). A certificate as to the amount of such payment or liability delivered to the Borrower by a Bank (with a copy to the Administrative Agent), or by the Administrative Agent on its own behalf or on behalf of a Bank, shall be conclusive absent manifest error. Any payment required under this indemnification shall be made within 15 days from the date such Bank or the Administrative Agent (as the case may be) makes written demand therefor. The Administrative Agent shall reasonably cooperate, at no cost to the Administrative Agent or the Banks, with efforts by Borrower to recover any Taxes or Other Taxes which Borrower reasonably believes were incorrectly or illegally imposed.

(d)(i) Any Bank that is entitled to an exemption from or reduction of withholding Tax with respect to payments made under any Loan Document shall deliver to the Borrower and the Administrative Agent, at the time or times reasonably requested by the Borrower or the Administrative Agent, such properly completed and executed documentation reasonably requested by the Borrower or the Administrative Agent as will permit such payments to be made without withholding or at a reduced rate of withholding. In addition, any Bank, if reasonably requested by the Borrower or the Administrative Agent, shall deliver such other documentation prescribed by applicable law or reasonably requested by the Borrower or the Administrative Agent as will enable the Borrower or the Administrative Agent to determine whether or not such Bank is subject to backup withholding or information reporting requirements. Notwithstanding anything to the contrary in the preceding two sentences, the completion, execution and submission of such documentation (other than such documentation set forth in Section 8.4(d)(ii)(1), (ii)(2) and (ii)(3) below) shall not be required if in the Bank's reasonable judgment such completion, execution or submission would subject such Bank to any material unreimbursed cost or expense or would materially prejudice the legal or commercial position of such Bank.

(ii)Without limiting the generality of the foregoing,

(1)Each Bank organized under the laws of the United States shall deliver to the Borrower and the Administrative Agent on or prior to the date on which such Bank becomes a Bank under this Agreement (and from time to time thereafter upon the reasonable request of the Borrower or the Administrative Agent), executed originals of IRS Form W-9 certifying that such Bank is exempt from U.S. federal backup withholding tax.

(2)Each Bank organized under the laws of a jurisdiction outside the United States, on or prior to the date of its execution and delivery of this Agreement in the case of each Bank listed on the signature pages hereof and on or prior to the date on which it becomes a Bank in the case of each other Bank, and from time to time thereafter if requested in writing by the Borrower (but only so long as such Bank remains lawfully able to do so), shall provide the Borrower and the Administrative Agent with whichever of the following is applicable:

(A)If such Bank is claiming the benefits of an income tax treaty to which the United States is a party (x) with respect to payments of interest under any Loan Document, executed originals of IRS Form W-8BEN establishing an exemption from, or reduction of, United States federal withholding Tax pursuant to the “interest” article of such tax treaty and (y) with respect to any other applicable payments under any Loan Document, IRS Form W-8BEN establishing an exemption from, or reduction of, United States federal withholding Tax pursuant to the “business profits” or “other income” article of such tax treaty;

(B)Executed originals of IRS Form W-8ECI;

(C)if such Bank is claiming the benefits of the exemption for portfolio interest under Section 881(c) of the Internal Revenue Code, (x) a certificate reasonably acceptable to Bank and the Borrower that such Bank is not a “bank” within the meaning of Section 881(c)(3)(A) of the Internal Revenue Code, a “10 percent shareholder” of the Borrower within the meaning of Section 881(c)(3)(B) of the Internal Revenue Code, or a “controlled foreign corporation” described in Section 881(c)(3)(C) of the Internal Revenue Code (a “U.S. Tax Compliance Certificate”) and (y) executed originals of IRS Form W-8BEN; or

(D)to the extent such Bank is not the beneficial owner, executed originals of IRS Form W-8IMY, accompanied by IRS Form W-8ECI, IRS Form W-8BEN, a U.S. Tax Compliance Certificate, IRS Form W-9, and/or other certification documents from each beneficial owner, as applicable; provided that if such Bank is a partnership and one or more direct or indirect partners of such Bank are claiming the portfolio interest exemption, such Bank may provide a U.S. Tax Compliance Certificate on behalf of each such direct and indirect partner;

(3)if a payment made to a Bank under any Loan Document would

be subject to United States federal withholding Tax imposed by FATCA if such Bank were to fail to comply with the applicable reporting requirements of FATCA (including those contained in Section 1471(b) or 1472(b) of the Internal Revenue Code, as applicable), such Bank shall deliver to the Borrower and the Administrative Agent at the time or times prescribed by law and at such time or times reasonably requested by the Borrower or the Administrative Agent such documentation prescribed by applicable law (including as prescribed by Section 1471(b)(3)(C)(i) of the Internal Revenue Code) and such additional documentation reasonably requested by the Borrower or the Administrative Agent as may be necessary for the Borrower and the Administrative Agent to comply with their obligations under FATCA and to determine that such Bank has complied with such Bank's obligations under FATCA or to determine the amount to deduct and withhold from such payment. Solely for purposes of this clause (3), “FATCA” shall include any amendments made to FATCA after the date of this Agreement.

U.S. federal withholding taxes imposed on amounts payable to or for the account of a Bank with respect to an applicable interest in a Loan pursuant to a law in effect on the date on which (1) such Bank acquires such interest in the Loan (other than pursuant to an assignment request by the Borrower under Section 8.7) or (2) such Bank changes its lending office, except in each case to the extent that, pursuant to Section 8.4(a), amounts with respect to such taxes were payable either to such Bank's assignor immediately before such Bank became a party hereto or to such Bank immediately before it changed its lending office shall be considered excluded from “Taxes” as defined in Section 8.4(a).

(iii)For purposes of this Section 8.4(d) and (e), the term “Bank” includes the Administrative Agent.

(e)For any period with respect to which a Bank has failed to comply with Section 8.4(d) (unless such failure is due to a change in treaty, law or regulation occurring subsequent to the date on which a form originally was required to be provided), such Bank shall not be entitled to indemnification under Section 8.4(a) with respect to Taxes imposed by the United States and attributable to such failure to comply; provided, however, that should a Bank, which is otherwise exempt from or subject to a reduced rate of withholding tax, become subject to Taxes because of its failure to deliver a form required hereunder, the Borrower shall take such steps as such Bank shall reasonably request to assist such Bank to recover such Taxes.

(f)If the Borrower is required to pay additional amounts to or for the account of any Bank pursuant to this Section 8.4, then such Bank will change the jurisdiction of its Applicable Lending Office so as to eliminate or reduce any such additional payment which may thereafter accrue if such change, in the judgment of such Bank, is not otherwise disadvantageous to such Bank.

(g)If any party determines, in its sole discretion exercised in good faith, that it has received a refund of any Taxes or Other Taxes as to which it has been indemnified pursuant to this Section 8.4 (including by the payment of additional amounts pursuant to this Section 8.4), it shall pay to the Borrower an amount equal to such refund (but only to the extent of indemnity payments made under this Section with respect to the Taxes or Other Taxes giving rise to such refund), net of all out-of-pocket expenses (including Taxes or Other Taxes) of

such indemnified party and without interest (other than any interest paid by the relevant Governmental Authority with respect to such refund). Such indemnifying party, upon the request of such indemnified party, shall repay to such indemnified party the amount paid over pursuant to this paragraph (g) (plus any penalties, interest or other charges imposed by the relevant Governmental Authority) in the event that such indemnified party is required to repay such refund to such Governmental Authority. Notwithstanding anything to the contrary in this paragraph (g), in no event will the indemnified party be required to pay any amount to an indemnifying party pursuant to this paragraph (g) the payment of which would place the indemnified party in a less favorable net after-Tax position than the indemnified party would have been in if the indemnification payments or additional amounts giving rise to such refund had never been paid or if the refund results from tax attributes unrelated to the event giving rise to the indemnity payment. This paragraph shall not be construed to require any indemnified party to make available its Tax returns (or any other information relating to its Taxes that it deems confidential) to the indemnifying party or any other Person.

(h)For purposes of this Section 8.4, the term “applicable law” includes FATCA.”

(q)Article VIII of the Credit Agreement is amended by inserting the following new Section 8.7 immediately after Section 8.6:

“Section 8.7Mitigation Obligations; Replacement of Lenders. (a) If any Bank requests compensation under Section 8.3, or if the Borrower is required to pay any additional amount to any Bank or any Governmental Authority for the account of any Bank pursuant to Section 8.4, then such Bank shall use reasonable efforts to designate a different lending office for funding or booking its Loans hereunder or to assign its rights and obligations hereunder to another of its offices, branches or Affiliates, if, in the judgment of such Bank, such designation or assignment (i) would eliminate or reduce amounts payable pursuant to Section 8.3 or 8.4, as the case may be, in the future and (ii) would not subject such Bank to any unreimbursed cost or expense and would not otherwise be disadvantageous to such Bank. The Borrower hereby agrees to pay all reasonable costs and expenses incurred by any Bank in connection with any such designation or assignment.

(b)If (w) any Bank is unable to make, maintain or fund its Eurodollar Loans pursuant to Section 8.2 for a period of ten (10) consecutive days, or (x) any Bank requests compensation under Section 8.3, or if the Borrower is required to pay any additional amount to any Bank or any Governmental Authority for the account of any Bank pursuant to Section 8.4, or (y) if any Bank becomes a Defaulting Lender, or (z) any Bank has refused to consent to any proposed amendment, modification, waiver, termination or consent with respect to any provision of this Agreement or any other Loan Document that, pursuant to Section 9.5, requires the consent of all Banks or of all Banks affected thereby and with respect to which Banks constituting the Required Banks have consented to such proposed amendment, modification, waiver, termination or consent, then the Borrower may, at its sole expense and effort, upon notice to such Bank and the Administrative Agent, require such Bank to assign and delegate, without recourse (in accordance with and subject to the restrictions contained in Section 9.6), all its interests, rights and obligations under this Agreement to an assignee that shall assume such obligations (which assignee may be another Bank, if a Bank accepts such assignment); provided that (i) the Borrower shall have received the prior written consent of the Administrative Agent, which consent shall not unreasonably be withheld or delayed (provided that no such consent shall be required for an assignment to any Bank so long as, after giving effect to such assignment, such Bank's share of outstanding Loans does not exceed 25%), (ii)

such Bank shall have received payment of an amount equal to the outstanding principal of its Loans, accrued interest thereon, accrued fees and all other amounts payable to it hereunder, from the assignee (to the extent of such outstanding principal and accrued interest and fees) or the Borrower (in the case of all other amounts), (iii) in the case of any such assignment resulting from a claim for compensation under Section 8.3 or payments required to be made pursuant to Section 8.4, such assignment will result in a reduction in such compensation or payments and (iv) in the case of any such assignment resulting from a Bank's refusal to consent to a proposed amendment, modification, waiver, termination or consent, the assignee shall approve the proposed amendment, modification, waiver, termination or consent. A Bank shall not be required to make any such assignment and delegation if, prior thereto, as a result of a waiver by such Bank or otherwise, the circumstances entitling the Borrower to require such assignment and delegation cease to apply.”

(r)Section 9.1 of the Credit Agreement is amended by inserting the following new paragraph at the end of such section:

“Notices and other communications to the Banks hereunder may be delivered or furnished by electronic communications pursuant to procedures approved by the Administrative Agent; provided that the foregoing shall not apply to notices pursuant to Article II unless otherwise agreed by the Administrative Agent and the applicable Bank. The Administrative Agent or the Borrower may, in its discretion, agree to accept notices and other communications to it hereunder by electronic communications pursuant to procedures approved by it; provided that approval of such procedures may be limited to particular notices or communications.”

(s)Section 9.6(a) of the Credit Agreement is amended by inserting the words “(and any attempted assignment or transfer by the Borrower without such consent shall be void)” at the end of such subsection after the words “all Banks”.

(t)Section 9.6(b) of the Credit Agreement is amended and restated in its entirety to read as follows:

“(b)Any Bank may at any time grant to one or more banks or other entities, other than the Borrower and its Affiliates (each a “Participant”) participating interests in its Commitment or any or all of its Loans. In the event of any such grant by a Bank of a participating interest to a Participant, whether or not upon notice to the Borrower and the Administrative Agent, such Bank shall remain responsible for the performance of its obligations hereunder, and the Borrower and the Administrative Agent shall continue to deal solely and directly with such Bank in connection with such Bank's rights and obligations under this Agreement. Any agreement pursuant to which any Bank may grant such a participating interest shall provide that such Bank shall retain the sole right and responsibility to enforce the obligations of the Borrower hereunder including, without limitation, the right to approve any amendment, modification or waiver of any provision of this Agreement; provided that such participation agreement may provide that such Bank will not agree to any modification, amendment or waiver of this Agreement described in clause (i), (ii), (iii) or (iv) of Section 9.5 without the consent of the Participant. The Borrower agrees that each Participant shall, to the extent provided in its participation agreement, be entitled to the benefits of Article VIII with respect to its participating interest (subject to the requirements and limitations therein, including the requirements under Section 8.4(d)(iii) (it being understood that the documentation required under Section 8.4(d)(iii) shall be delivered to the participating

Lender)) to the same extent as if it were a Lender and had acquired its interest by assignment pursuant to paragraph (c) of this Section; provided that such Participant (i) agrees to be subject to the provisions of Sections 8.7 as if it were an assignee under paragraph (c) of this Section; and (ii) shall not be entitled to receive any greater payment under Sections 8.3 or 8.4, with respect to any participation, than its participating Lender would have been entitled to receive, except to the extent such entitlement to receive a greater payment results from a Change in Law that occurs after the Participant acquired the applicable participation. An assignment or other transfer which is not permitted by subsection (c) or (d) below shall be given effect for purposes of this Agreement only to the extent of a participating interest granted in accordance with this subsection (b). Each Lender that sells a participation shall, acting solely for this purpose as an agent of the Borrower, maintain a register on which it enters the name and address of each Participant and the principal amounts (and stated interest) of each Participant's interest in the Loans or other obligations under the Loan Documents (the “Participant Register”); provided that no Lender shall have any obligation to disclose all or any portion of the Participant Register (including the identity of any Participant or any information relating to a Participant's interest in any commitments, loans, letters of credit or its other obligations under any Loan Document) to any Person except to the extent that such disclosure is necessary to establish that such commitment, loan, letter of credit or other obligation is in registered form under Section 5f.103-1(c) of the United States Treasury Regulations. The entries in the Participant Register shall be conclusive absent manifest error, and such Lender shall treat each Person whose name is recorded in the Participant Register as the owner of such participation for all purposes of this Agreement notwithstanding any notice to the contrary. For the avoidance of doubt, the Administrative Agent (in its capacity as Administrative Agent) shall have no responsibility for maintaining a Participant Register.”

(u)Section 9.6(c) of the Credit Agreement is amended and restated in its entirety to read as follows:

“(c)Any Bank may at any time assign to one or more Eligible Assignees (each an “Assignee”) all, or a proportionate part of all, of its rights and obligations under this Agreement, the Notes and the other Loan Documents, and such Assignee shall assume such rights and obligations, pursuant to an Assignment and Assumption Agreement in substantially the form of Exhibit D attached hereto executed by such Assignee and such transferor Bank, with (and subject to) the prior written consent of (x) the Administrative Agent, which consent shall not be unreasonably withheld or delayed, and, (y) provided no Event of Default shall have occurred and be continuing, the Borrower, which consent shall not be unreasonably withheld or delayed, provided further, however, that no such consent by the Borrower shall be required in the case of an assignment to another Bank. Notwithstanding anything to the contrary contained herein, no Bank may assign or participate its interest to the Borrower and its Affiliates. Each partial assignment shall be made as an assignment of a proportionate part of all the assigning Bank's rights and obligations under this Agreement. The assignee, if it shall not be a Bank, shall deliver to the Administrative Agent an Administrative Questionnaire. Upon execution and delivery of such instrument and payment by such Assignee to such transferor Bank of an amount equal to the purchase price agreed between such transferor Bank and such Assignee, such Assignee shall be a Bank party to this Agreement and shall have all the rights and obligations of a Bank with a Loan as set forth in such instrument of assumption, and the transferor Bank shall be released from its obligations hereunder to a corresponding extent, and no further consent or action by any party shall be required. Upon the consummation of any assignment pursuant to this subsection (c), the transferor Bank, the Administrative Agent

and the Borrower shall make appropriate arrangements so that, if required, a new Note or Notes are issued to the Assignee. In connection with any such assignment (except for an assignment by a Bank to its Affiliate), the transferor Bank shall pay to the Administrative Agent an administrative fee for processing such assignment in the amount of $3,500. The Assignee shall deliver to the Borrower and the Administrative Agent certification as to exemption from deduction or withholding of any United States federal income taxes in accordance with Section 8.4.”

(v)Section 9.6(e) of the Credit Agreement is amended and restated in its entirety to read as follows:

“(e)Any Bank may at any time assign or pledge all or any portion of its rights under this Agreement and its Note to secure obligations of such Bank, including any pledge to a Federal Reserve Bank. No such assignment shall release the transferor Bank from its obligations hereunder or substitute any such assignee or pledgee for such Bank as a party hereto.”

SECTION 2. REPRESENTATIONS AND WARRANTIES

In order to induce the Banks and the Administrative Agent to enter into this Amendment No. 1, the Borrower represents and warrants to each Bank and the Administrative Agent that the following statements are true, correct and complete:

(i)the Borrower is duly organized, validly existing and in good standing as a limited partnership under the laws of the State of Delaware and has all powers and all material governmental licenses, authorizations, consents and approvals required to own its property and assets and carry on its business as now conducted or as it presently proposes to conduct and has been duly qualified and is in good standing in every jurisdiction in which the failure to be so qualified and/or in good standing is likely to have a Material Adverse Effect;

(ii)the Borrower has the organizational power and authority to execute, deliver and carry out the terms and provisions of each of this Amendment No. 1 and the Credit Agreement as amended by this Amendment No. 1 and has taken all necessary action to authorize the execution and delivery on behalf of the Borrower and the performance by the Borrower of this Amendment No. 1 and the Credit Agreement as amended by this Amendment No. 1. The Borrower has duly executed and delivered this Amendment No. 1, and each of this Amendment No. 1 and the Credit Agreement as amended by this Amendment No. 1 constitutes the legal, valid and binding obligation of the Borrower, enforceable in accordance with its terms, except as enforceability may be limited by applicable insolvency, bankruptcy or other laws affecting creditors rights generally, or general principles of equity, whether such enforceability is considered in a proceeding in equity or at law;

(iii)neither the execution, delivery or performance by or on behalf of the Borrower of this Amendment No. 1 and the Credit Agreement as amended by this Amendment No. 1, nor compliance by the Borrower with the terms and provisions hereof and thereof nor the consummation of the transactions contemplated by this Amendment No. 1 and the Credit Agreement as amended by this Amendment No. 1, (a) will contravene any applicable provision of any law, statute, rule, regulation, order, writ, injunction or decree of any court or governmental instrumentality applicable to Borrower except to the extent such contravention is not likely to have a Material Adverse Effect, or (b) will conflict with or result in any breach of, any of the terms, covenants, conditions or provisions of, or constitute a default under, or result in the creation or imposition of (or the obligation to create or impose) any Lien upon any of the property or assets of the Borrower pursuant to the terms of any material indenture, mortgage, deed of trust, or other agreement or other instrument to which the Borrower (or of any partnership of which the Borrower is a partner) is a

party or by which it or any of its property or assets is bound or to which it is subject except to the extent such conflict or breach is not likely to have a Material Adverse Effect, or (c) will conflict with or result in a breach of any organizational document of any Subsidiary, the certificate of limited partnership, partnership agreement or other organizational document of Borrower, or the General Partner's articles of incorporation or by-laws; and

(iv)the representations and warranties of the Borrower contained in Article IV of the Credit Agreement are and will be true and correct in all material respects on and as of the date hereof and the Amendment Effective Date to the same extent as though made on and as of such dates, except to the extent such representations and warranties specifically relate to an earlier date, in which case they were true and correct in all material respects on and as of such earlier date; and

(v)no event has occurred and is continuing or will result from the consummation of the transactions contemplated by this Amendment No. 1 that would constitute a Default or Event of Default.

SECTION 3. CONDITIONS TO EFFECTIVENESS

This Amendment No. 1 shall become effective only upon the satisfaction of the following conditions precedent (the date of satisfaction of such conditions being referred to as the “Amendment Effective Date”):

A.The Borrower, the Administrative Agent, and the Required Banks shall have indicated their consent hereto by the execution and delivery to the Administrative Agent of this Amendment No. 1, and the General Partner shall have executed and delivered to the Administrative Agent the Reaffirmation of Guaranty of Payment attached to this Amendment No. 1.

B.The Administrative Agent shall have received a secretary's certificate from the Borrower (i) either confirming that there have been no changes to its organizational documents since March 29, 2012, or if there have been changes to the Borrower's organizational documents since such date, certifying as to such changes, and (ii) certifying as to resolutions and incumbency of officers with respect to this Amendment No. 1 and the transactions contemplated hereby.

C.The Administrative Agent shall have received payment of all reasonable out-of-pocket costs and expenses for which invoices have been presented (including the reasonable fees and expenses of legal counsel for which the Borrower agrees it is responsible pursuant to Section 9.3 of the Credit Agreement), incurred in connection with this Amendment No. 1.

SECTION 4. MISCELLANEOUS

A.Reference to and Effect on the Credit Agreement and the Other Loan Documents.

(i)On and after the effective date of this Amendment No. 1, each reference in the Credit Agreement to “this Agreement”, “hereunder”, “hereof”, “herein” or words of like import referring to the Credit Agreement and each reference in the other Loan Documents to the “Credit Agreement”, “thereunder”, “thereof” or words of like import referring to the Credit Agreement shall mean and be a reference to the Credit Agreement as amended hereby.

(ii)Except as specifically amended by this Amendment No. 1, the Credit Agreement and the other Loan Documents shall remain in full force and effect and are hereby ratified and confirmed.

(iii)The execution, delivery and performance of this Amendment No. 1 shall not, except as expressly provided herein, constitute a waiver of any provision of, or operate as a waiver of any right, power or remedy of the Administrative Agent or any Bank under the Credit Agreement or any of the other Loan Documents.

B.Headings. Section and subsection headings in this Amendment No. 1 are included herein for convenience of reference only and shall not constitute a part of this Amendment No. 1 for any other purpose or be given any substantive effect.

C.Applicable Law. THIS AMENDMENT NO. 1 AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH AND BE GOVERNED BY THE LAWS OF THE STATE OF NEW YORK (WITHOUT GIVING EFFECT TO THE PRINCIPLES THEREOF RELATING TO CONFLICTS OF LAW THAT WOULD CAUSE THE APPLICATION OF ANY LAW OTHER THAN THE STATE OF NEW YORK).

D.Counterparts; Effectiveness. This Amendment No. 1 may be signed in any number of counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. This Amendment No. 1 and the Credit Agreement constitute the entire agreement and understanding among the parties hereto and supersedes any and all prior agreements and understandings, oral or written, relating to the subject matter hereof. Delivery of an executed counterpart of a signature page to this Amendment No. 1 by facsimile or other electronic methods (including .pdf) shall be effective as delivery of a manually executed counterpart of this Amendment No. 1.

[Signature Pages Follow]

||

IN WITNESS WHEREOF, the parties hereto have caused this Amendment No. 1 to be duly executed and delivered by their respective officers thereunto duly authorized as of the date first written above.

BORROWER:

KILROY REALTY, L.P.,

a Delaware limited partnership

By: Kilroy Realty Corporation, a Maryland corporation, its general partner

By: /s/ Tyler H. Rose

Name: Tyler H. Rose

Title: Executive Vice President and Chief Financial Officer

By: /s/ Michelle Ngo

Name: Michelle Ngo

Title: Vice President and Treasurer

JPMORGAN CHASE BANK, N.A., as Administrative Agent and as a Bank

By: /s/ Marc Costantino

Name: Marc Costantino

Title: Executive Director

BANK OF AMERICA, N.A.

By: /s/ James P. Johnson

Name: James P. Johnson

Title: Senior Vice President

WELLS FARGO BANK, NATIONAL ASSOCIATION

By: /s/ Carl Skanderup

Name: Carl Skanderup

Title: Vice President

PNC BANK, NATIONAL ASSOCIATION

By: /s/ Darin Mortimer

Name: Darin Mortimer

Title: Vice President

UNION BANK, N.A.

By: /s/ Juliana Matson

Name: Juliana Matson

Title: Vice President

BANK OF THE WEST,

a California banking corporation

By: /s/ Irina Galieva

Name: Irina Galieva

Title: Vice President / Documentation Manager

By: /s/ Ben Arroyo

Name: Ben Arroyo

Title: Syndications Officer, SeniorU.S. BANK NATIONAL ASSOCIATION

By: /s/ Patrick J. Brown

Name: Patrick J. Brown

Title: Vice Presidentcompass bank,

an Alabama banking corporation

By: /s/ Brian Tuerff

Name: Brian Tuerff

Title: Senior Vice President comerica bank

By: /s/ Charles Weddell

Name: Charles Weddell

Title: Vice President KEYBANK, NATIONAL ASSOCIATION

By: /s/ Michael P. Szuba

Name: Michael P. Szuba

Title: Vice President SUMITOMO MITSUI BANKING CORPORATION

By: /s/ William G. Karl

Name: William G. Karl

Title: General Manager THE BANK OF NOVA SCOTIA

By: /s/ Christopher Usas

Name: Christopher Usas

Title: Director CHANG HWA COMMERCIAL BANK, LTD., LOS ANGELES BRANCH

By: /s/ Chu-I Hung

Name: Chu-I Hung

Title: VP & General Manager

Reaffirmation of Guaranty of Payment

The undersigned Kilroy Realty Corporation (the “Guarantor”) hereby (a) acknowledges the foregoing Amendment No. 1, (b) reaffirms its guaranty of the Guaranteed Obligations (as defined in the Guaranty of Payment dated as of March 29, 2012 executed and delivered by the Guarantor) under or in connection with the Credit Agreement, as modified by this Amendment No. 1, in accordance with the Guaranty of Payment executed and delivered by the Guarantor, and (c) confirms that its Guaranty of Payment shall remain in full force and effect after giving effect to this Amendment No. 1.

[Signature Page Follows]

GUARANTOR:

KILROY REALTY CORPORATION

By: /s/ Tyler H. Rose

Name: Tyler H. Rose

Title: Executive Vice President and Chief Financial Officer

By: /s/ Michelle Ngo

Name: Michelle Ngo

Title: Vice President and Treasurer

EX-10.56

Exhibit 10.56

AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT

dated as of November 28, 2012

among

KILROY REALTY, L.P.

JPMORGAN CHASE BANK, N.A.,

as Bank and as Administrative Agent for the Banks,

J.P. MORGAN SECURITIES LLC,

as Joint Lead Arranger and Joint Bookrunner,

MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED

as Joint Lead Arranger and Joint Bookrunner,

BANK OF AMERICA, N.A.,

as Syndication Agent,

BARCLAYS BANK PLC,

COMPASS BANK,

PNC BANK, NATIONAL ASSOCIATION

ROYAL BANK OF CANADA,

UNION BANK, N.A.,

U.S. BANK NATIONAL ASSOCIATION

and

WELLS FARGO BANK, N.A.,

as Documentation Agents,

and

THE BANKS LISTED HEREIN

Table of Contents

Article I DEFINITIONS    1

Section 1.1 Amendment and Restatement    1

Section 1.2 Definitions    2

Section 1.3 Accounting Terms and Determinations    24

Section 1.4 Types of Borrowings    24

Article II THE CREDITS    25

Section 2.1 Commitments to Lend    25

Section 2.2 Notice of Committed Borrowing    25

Section 2.3 Money Market Borrowings    26

Section 2.4 Notice to Banks; Funding of Loans    30

Section 2.5 Notes    31

Section 2.6 Maturity of Loans    32

Section 2.7 Interest Rates    32

Section 2.8 Fees    34

Section 2.9 Extended Maturity Date; Mandatory Termination    35

Section 2.10 Mandatory Prepayment    36

Section 2.11 Optional Prepayments    37

Section 2.12 General Provisions as to Payments    38

Section 2.13 Funding Losses    39

Section 2.14 Computation of Interest and Fees    40

Section 2.15 Method of Electing Interest Rates    40

Section 2.16 Letters of Credit    41

Section 2.17 Letter of Credit Usage Absolute    43

Section 2.18 Swingline Loan Subfacility    44

Article III CONDITIONS    46

Section 3.1 Closing    46

Section 3.2 Borrowings    48

Article IV REPRESENTATIONS AND WARRANTIES    49

Section 4.1 Existence and Power    49

Section 4.2 Power and Authority    50

Section 4.3 No Violation    50

Section 4.4 Financial Information    50

Section 4.5 Litigation    50

Section 4.6 Compliance with ERISA    51

Section 4.7 Environmental Compliance    51

Section 4.8 Taxes    53

Section 4.9 Full Disclosure    53

Section 4.10 Solvency    53

Section 4.11 Use of Proceeds; Margin Regulations    53

Section 4.12 Governmental Approvals    53

Section 4.13 Investment Company Act; Public Utility Holding Company Act    53

Section 4.14 Closing Date Transactions    54

Section 4.15 Representations and Warranties in Loan Documents    54

Section 4.16 Patents, Trademarks, etc    54

Section 4.17 No Default    54

Section 4.18 Licenses, etc    54

Section 4.19 Compliance With Law    54

Section 4.20 No Burdensome Restrictions    54

Section 4.21 Brokers' Fees    55

Section 4.22 Labor Matters    55

Section 4.23 Organizational Documents    55

Section 4.24 Principal Offices    55

Section 4.25 REIT Status    55

Section 4.26 Ownership of Property    55

Section 4.27 Insurance    55

Article V AFFIRMATIVE AND NEGATIVE COVENANTS    56

Section 5.1 Information    56

Section 5.2 Payment of Obligations    58

Section 5.3 Maintenance of Property; Insurance    58

Section 5.4 Conduct of Business    59

Section 5.5 Compliance with Laws    59

Section 5.6 Inspection of Property, Books and Records    59

Section 5.7 Existence    60

Section 5.8 Financial Covenants    60

Section 5.9 Restriction on Fundamental Changes; Operation and Control    61

Section 5.10 Changes in Business    61

Section 5.11 Sale of Unencumbered Asset Pool Properties    61

Section 5.12 Fiscal Year; Fiscal Quarter    62

Section 5.13 Margin Stock    62

Section 5.14 Use of Proceeds    62

Section 5.15 General Partner Status    62

Article VI DEFAULTS    62

Section 6.1 Events of Default    62

Section 6.2 Rights and Remedies    65

Section 6.3 Notice of Default    66

Section 6.4 Actions in Respect of Letters of Credit    66

Article VII THE ADMINISTRATIVE AGENT    68

Section 7.1 Appointment and Authorization    68

Section 7.2 Administrative Agent and Affiliates    68

Section 7.3 Action by Administrative Agent    69

Section 7.4 Consultation with Experts    69

Section 7.5 Liability of Administrative Agent    69

Section 7.6 Indemnification    70

Section 7.7 Credit Decision    70

Section 7.8 Successor Administrative Agent    70

Section 7.9 Administrative Agent's Fee    71

Section 7.10 Copies of Notices    71

Article VIII CHANGE IN CIRCUMSTANCES    71

Section 8.1 Basis for Determining Interest Rate Inadequate or Unfair    71

Section 8.2 Illegality    72

Section 8.3 Increased Cost and Reduced Return    73

Section 8.4 Taxes    74

Section 8.5 Base Rate Loans Substituted for Affected Euro-Dollar Loans    78

Section 8.6 SPC Loans    78

Section 8.7 Mitigation Obligations; Replacement of Lenders    80

Article IX MISCELLANEOUS    81

Section 9.1 Notices    81

Section 9.2 No Waivers    82

Section 9.3 Expenses; Indemnification    82

Section 9.4 Sharing of Set-Offs    83

Section 9.5 Amendments and Waivers    84

Section 9.6 Successors and Assigns    84

Section 9.7 USA Patriot Act    87

Section 9.8 Defaulting Lenders    87

Section 9.9 Governing Law; Submission to Jurisdiction    89

Section 9.10 Marshaling; Recapture    90

Section 9.11 Counterparts; Integration; Effectiveness    90

Section 9.12 WAIVER OF JURY TRIAL    91

Section 9.13 Survival    91

Section 9.14 Domicile of Loans    91

Section 9.15 Limitation of Liability    91

Section 9.16 No Bankruptcy Proceedings    91

Section 9.17 Optional Increase in Commitments    91

Section 9.18 Severability    92

Section 9.19 Interest Rate Limitation    92

Exhibit A    -    Form of Note

Exhibit A-1    -    Form of Note

Exhibit B    -    Unencumbered Asset Pool Properties (Fee Interests)

Exhibit C    -    Unencumbered Asset Pool Properties (Leasehold Interests)

Exhibit D    -    Form of Assignment and Assumption Agreement

Exhibit E    -    Form of Money Market Quote Request

Exhibit F    -    Form of Invitation for Money Market Quotes

Exhibit G    -    Form of Money Market Quote

Exhibit H    -    Form of Designation Agreement

Schedule 1    -    Commitments

Schedule 4.22    -    Labor Matters

AMENDED AND RESTATED REVOLVING CREDIT AGREEMENT dated as of November 28, 2012, among KILROY REALTY, L.P. (the “Borrower”), JPMORGAN CHASE BANK, N.A., as Bank and as Administrative Agent for the Banks (“Administrative Agent”), J.P. MORGAN SECURITIES LLC, as Joint Lead Arranger and Joint Bookrunner, MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED, as Joint Lead Arranger and Joint Bookrunner, BANK OF AMERICA, N.A., as Syndication Agent, Barclays Bank PLC, Compass Bank, PNC Bank, National Association, Royal Bank of Canada, Union Bank, N.A., U.S. Bank National Association and Wells Fargo Bank, N.A., as Documentation Agents, and the BANKS listed on the signature pages hereof (the “Banks”).

RECITALS

WHEREAS, the Borrower, JPMorgan Chase Bank, N.A., as administrative agent, and certain other lenders are party to the Revolving Credit Agreement dated as of August 10, 2010, as amended by the First Amendment to Revolving Credit Agreement dated as of June 22, 2011 and the Second Amendment to Revolving Credit Agreement dated as of March 29, 2012 (the “Existing Credit Agreement”), pursuant to which such lenders agreed to extend credit to the Borrower on the terms set forth therein; and

WHEREAS, the Borrower, the Administrative Agent and the Banks party hereto have agreed to enter into this Agreement to amend and restate the Existing Credit Agreement in its entirety as set forth herein;

NOW, THEREFORE, in consideration of the foregoing premises and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the parties hereto agree to amend and restate the Existing Credit Agreement in its entirety as follows:

DEFINITIONS

Section 1.Amendment and Restatement. This Agreement shall supersede the Existing Credit Agreement in its entirety, except as provided in this Section 1.1. On the Closing Date, the rights and obligations of the parties under each of the Existing Credit Agreement and the “Notes” defined therein shall be subsumed within and be governed by this Agreement and the Notes issued hereunder; provided however, that (x) all interest and all commitment, facility and other fees and expenses owing or accruing under or in respect of the Existing Credit Agreement shall be calculated as of the Closing Date (prorated in the case of any fractional periods), and shall be paid on the Closing Date in accordance with the method specified in the Existing Credit Agreement as if the Existing Credit Agreement were still in effect and (y) any of the other “Obligations” (as defined in the Existing Credit Agreement) outstanding under the Existing Credit Agreement shall, for purposes of this Agreement, be Obligations hereunder. The Banks' interests in such Obligations shall be reallocated on the Closing Date in accordance with each Bank's applicable Commitment Percentage.

Section 2.Definitions. The following terms, as used herein, have the following meanings:

“Absolute Rate Auction” means a solicitation of Money Market Quotes setting forth Money Market Absolute Rates pursuant to Section 2.3.

“Adjusted Annual EBITDA” means, for any period, Annual EBITDA for such period, minus the sum of (a) interest income other than interest income from mortgage notes not in excess of $5,000,000 per annum, and (b) a management fee reserve in an amount equal to 3% of consolidated total revenue (after deduction of interest income of Borrower and its subsidiaries for such period), plus the sum of (a) general and administrative expenses for such period to the extent included in Annual EBITDA and (b) actual management fees relating to Real Property for such period.

“Adjusted London Interbank Offered Rate” has the meaning set forth in Section 2.7(b).

“Administrative Agent” means JPMorgan Chase Bank, N.A., in its capacity as administrative agent for the Banks hereunder, and its successors in such capacity.

“Administrative Questionnaire” means, with respect to each Bank, an administrative questionnaire in the form prepared by the Administrative Agent and submitted to the Administrative Agent (with a copy to the Borrower) duly completed by such Bank.

“Affiliate” means, with respect to a specified Person, another Person that directly, or indirectly through one or more intermediaries, Controls or is Controlled by or is under common Control with the Person specified. In no event shall (x) the Administrative Agent or any Bank or (y) any other Person that is engaged in the business of making commercial loans (including revolving loans) in the ordinary course of business and for which the General Partner or the Borrower does not,

directly or indirectly, possess the power to cause the direction of the investment policies of such Person be deemed to be an Affiliate of the Borrower.

“Agreement” means this Amended and Restated Revolving Credit Agreement, as the same may from time to time hereafter be modified, supplemented or amended.

“Annual EBITDA” means, measured as of the last day of each calendar quarter (and without duplication), an amount derived from (i) total revenues relating to all Real Property Assets of the Borrower, the General Partner and their Consolidated Subsidiaries or to the Borrower's or the General Partner's interest in Minority Holdings for the previous four consecutive calendar quarters including the quarter then ended, on an accrual basis without giving effect to the straight-lining of rents, plus (ii) interest and other income of the Borrower, the General Partner and their Consolidated Subsidiaries, including, without limitation, real estate service revenues, for such period, plus (iii) nonrecurring extraordinary losses (including losses from the sale of Real Property Assets and/or early extinguishment of Debt or the forgiveness of Debt) for such period, plus (iv) non-cash compensation expense for such period not in excess of $15,000,000 per annum, plus (v) costs and expenses incurred during such period with respect to acquisitions consummated during such period, less (vi) total operating expenses and other expenses relating to such Real Property Assets and to the Borrower's and the General Partner's interest in Minority Holdings for such period (other than interest, taxes, depreciation, amortization, and other non-cash items), less (vii) total corporate operating expenses (including general overhead expenses) and other expenses of the Borrower, the General Partner, their Consolidated Subsidiaries and the Borrower's and the General Partner's interest in Minority Holdings (other than interest, taxes, depreciation, amortization and other non-cash items), less (viii) gains from discontinued operations and extraordinary gains or losses, for such period, and less (ix) nonrecurring extraordinary gains (including gains from the sale of Real Property Assets and/or the early extinguishment of Debt or the forgiveness of Debt) for such period. For purposes of this Agreement, Annual EBITDA shall be deemed to include only the Borrower's pro rata share (such share being based upon the Borrower's percentage ownership interest as shown on the Borrower's annual audited financial statements) of the Annual EBITDA of any Person in which the Borrower, directly or indirectly, owns an interest.

“Applicable Interest Rate” means the lesser of (x) the rate at which the interest rate applicable to any floating rate Debt could be fixed, at the time of calculation, by the Borrower entering into an unsecured interest rate swap agreement (or, if such rate is incapable of being fixed by entering into an unsecured interest rate swap agreement at the time of calculation, a reasonably determined fixed rate equivalent), and (y) the rate at which the interest rate applicable to such floating rate Debt is actually capped, at the time of calculation, if the Borrower has entered into an interest rate cap agreement with respect thereto or if the documentation for such Debt contains a cap.

“Applicable Lending Office” means, with respect to any Bank, (i) in the case of its Base Rate Loans and Swingline Loans, its Domestic Lending Office, (ii) in the case of its Euro-Dollar Loans, its Euro-Dollar Lending Office, and (iii) in the case of its Money Market Loans, its Money Market Lending Office.

“Applicable Margin” means, with respect to each Loan, the respective percentages per annum determined, at any time, based on the range into which Borrower's Credit Rating then falls, in accordance with the following table.

Range of Borrower's Credit Rating*	Applicable Margin for Euro-Dollar Loans (% per annum)	Applicable Margin for Base Rate Loans (% per annum)
<BBB-/Baa3 or unrated	1.75%	0.75%
BBB-/Baa3	1.45%	0.45%
BBB/Baa2	1.175%	0.175%
BBB+/Baal	1.075%	0.075%
A-/A3 or better	1%	—%

* Applicable rating for purposes of determining the Applicable Margin is Borrower's Credit Rating and if there are only two Borrower's Credit Ratings, then it will be the higher of the two. In the event that the Borrower's Credit Ratings are more than one level apart, the median rating will be used. If there are three Borrower's Credit Ratings and such ratings are split, then, if the difference between the highest and lowest is one level apart, it will be the highest of the three, but if the difference is more than one level, the rating will be the average of the two highest (or if such average is not a recognized category, then the second highest rating will be used). If there is only one Borrower's Credit Rating, the Applicable Margin shall be based on such rating.

Should Borrower (or General Partner) lose its Investment Grade Rating from both S&P and Moody's, pricing will revert to the unrated portion of the table above. Upon reinstatement of such Investment Grade Rating from either S&P or Moody's, pricing will revert to the rated pricing table above.

“Assignee” has the meaning set forth in Section 9.6(c).

“Bank” means each bank listed on the signature pages hereof, each Assignee which becomes a Bank pursuant to Section 9.6(c), and their respective successors and each Designated Lender; provided, however, that the term “Bank” shall exclude each Designated Lender when used in reference to a Committed Loan, the Commitments or terms relating to the Committed Loans and the Commitments and shall further exclude each Designated Lender for all other purposes hereunder except that any Designated Lender which funds a Money Market Loan shall, subject to Section 9.6(d), have the rights (including the rights given to a Bank contained in Section 9.3 and otherwise in Article 9) and obligations of a Bank associated with holding such Money Market Loan.

“Bankruptcy Code” means Title 11 of the United States Code, entitled “Bankruptcy”, as amended from time to time, and any successor statute or statutes.

“Bankruptcy Event” means, with respect to any Person, such Person becomes the subject of a bankruptcy or insolvency proceeding, or has had a receiver, conservator, trustee, administrator, custodian, assignee for the benefit of creditors or similar Person charged with the reorganization or liquidation of its business appointed for it, or, in the good faith determination of the Administrative Agent, has taken any action in furtherance of, or indicating its consent to, approval of, or acquiescence in, any such proceeding or appointment, provided that a Bankruptcy Event shall not result solely by virtue of any ownership interest, or the acquisition of any ownership interest, in such Person by a Governmental Authority or instrumentality thereof, provided, further, that such ownership interest does not result in or provide such Person with immunity from the jurisdiction of courts within the United States or from the enforcement of judgments or writs of attachment on its assets or permit such Person (or such Governmental Authority or instrumentality) to reject, repudiate, disavow or disaffirm any contracts or agreements made by such Person.

“Base Rate” means, for any day, a rate per annum equal to the highest of (i) the Prime Rate, (ii) the Federal Funds Rate +.50% and (iii) one-month London Interbank Offered Rate (determined as though the interest period commenced as of the date of determination) + 1%. Any change in the Base Rate due to a change in the Prime Rate, the Federal Funds Rate or the London Interbank Offered Rate shall be effective from and including the effective date of such change in the Prime Rate, the Federal Funds Rate or the London Interbank Offered Rate, respectively.

“Base Rate Borrowing” means a Borrowing comprised of Base Rate Loans.

“Base Rate Loan” means a Committed Loan to be made by a Bank as a Base Rate Loan in accordance with the applicable Notice of Borrowing or pursuant to Article VIII.

“BBA LIBOR” has the meaning set forth in Section 2.7(b).

“Benefit Arrangement” means at any time an employee benefit plan within the meaning of Section 3(3) of ERISA which is not a Plan or a Multiemployer Plan and which is maintained or otherwise contributed to by any member of the ERISA Group.

“Borrower” means Kilroy Realty, L.P. and its successors.

“Borrower's Credit Rating” means the rating assigned by the Rating Agencies to the General Partner's or the Borrower's senior unsecured long term indebtedness, or if no such rating is available, then the General Partner's or the Borrower's issuer rating.

“Borrowing” has the meaning set forth in Section 1.4.

“Capital Expenditures” means, for any period, the sum of all recurring expenditures on capital improvements (whether paid in cash or accrued as a liability) by the Borrower which are capitalized on the consolidated balance sheet of the Borrower in conformity with GAAP, but less (i) all expenditures made with respect to the acquisition by the Borrower and its Consolidated Subsidiaries of any interest in real property within nine months after the date such interest in real property is acquired and (ii) capital expenditures made from the proceeds of insurance or condemnation awards (or payments in lieu

thereof) or indemnity payments received during such period by Borrower or any of its Consolidated Subsidiaries from third parties.

“Cash or Cash Equivalents” means (i) cash, (ii) direct obligations of the United States Government, including, without limitation, treasury bills, notes and bonds, (iii) interest bearing or discounted obligations of Federal agencies and Government sponsored entities or pools of such instruments offered by banks rated AA or better by S&P or Aa2 by Moody's and dealers, including, without limitation, Federal Home Loan Mortgage Corporation participation sale certificates, Government National Mortgage Association modified pass-through certificates, Federal National Mortgage Association bonds and notes, Federal Farm Credit System securities, (iv) time deposits, domestic and Eurodollar certificates of deposit, bankers acceptances, commercial paper rated at least A-1 by S&P and P-1 by Moody's, and/or guaranteed by an Aa rating by Moody's, an AA rating by S&P, or better rated credit, floating rate notes, other money market instruments and letters of credit each issued by banks which have a long-term debt rating of at least AA by S&P or Aa2 by Moody's, (v) obligations of domestic corporations, including, without limitation, commercial paper, bonds, debentures, and loan participations, each of which is rated at least AA by S&P, and/or Aa2 by Moody's, and/or unconditionally guaranteed by an AA rating by S&P, an Aa2 rating by Moody's, or better rated credit, (vi) obligations issued by states and local governments or their agencies, rated at least MIG-1 by Moody's and/or SP-1 by S&P and/or guaranteed by an irrevocable letter of credit of a bank with a long-term debt rating of at least AA by S&P or Aa2 by Moody's, (vii) repurchase agreements with major banks and primary government securities dealers fully secured by U.S. Government or agency collateral equal to or exceeding the principal amount on a daily basis and held in safekeeping, (viii) real estate loan pool participations, guaranteed by an entity with an AA rating given by S&P or an Aa2 rating given by Moody's, or better rated credit, and (ix) shares of any mutual fund that has its assets primarily invested in the types of investments referred to in clauses (i) through (v).

“Change in Law” has the meaning set forth in Section 8.3.

“Charges” has the meaning set forth in Section 9.19.

“Closing Date” has the meaning set forth in Section 3.1.

“Commitment” means, with respect to each Bank, the commitment of such Bank to make Loans and to acquire participations in Letters of Credit and Swingline Loans hereunder, expressed as the maximum aggregate amount of such commitment, as such amount may be reduced from time to time pursuant to Sections 2.9(b) and 2.11(f), or increased pursuant to Section 9.17. The initial amount of each Bank's Commitment is set forth on Schedule 1, or in the Assignment and Assumption Agreement pursuant to which such Bank shall have assumed its Commitment.

“Commitment Percentage” means, with respect to any Bank, the percentage of the total Commitments represented by such Bank's Commitment. If the Commitments have expired or terminated, the Commitment Percentages shall be determined based on the Commitments most recently in effect, giving effect to any assignments.

“Committed Borrowing” has the meaning set forth in Section 1.4.

“Committed Loan” means a Loan made by a Bank pursuant to Section 2.1; provided that, if any such Loan or loans (or portions thereof) are combined or subdivided pursuant to a Notice of Interest Rate Election, the term “Committed Loan” shall refer to the combined principal amount resulting from such combination or to each of the separate principal amounts resulting from such subdivision, as the case may be.

“Completion of Construction” means the issuance of a temporary or permanent certificate of occupancy for the improvements under construction, permitting the use and occupancy thereof for their regular intended uses.

“Consolidated Subsidiary” means, at any date, any Subsidiary or other entity which is consolidated with the Borrower in accordance with GAAP.

“Consolidated Tangible Net Worth” means at any date the difference between (a) Total Asset Value, less (b) Total Debt.

“Contingent Obligation” as to any Person means, without duplication, (i) any guaranty of the principal of the Debt of any other Person, (ii) any contingent obligation of such Person required to be shown on such Person's balance sheet in accordance with GAAP, and (iii) any obligation required to be disclosed in the footnotes to such Person's financial statements, guaranteeing partially or in whole any non-recourse Debt, lease, dividend or other obligation, exclusive of contractual indemnities (including, without limitation, any indemnity or price-adjustment provision relating to the purchase or sale of

securities or other assets) and guarantees of non-monetary obligations (other than guarantees of completion) which have not yet been called on or quantified, of such Person or of any other Person. The amount of any Contingent Obligation described in clause (iii) shall be deemed to be (a) with respect to a guaranty of interest or interest and principal, or operating income guaranty, the sum of all payments required to be made thereunder (which in the case of an operating income guaranty shall be deemed to be equal to the debt service for the note secured thereby), calculated at the Applicable Interest Rate, through (i) in the case of an interest or interest and principal guaranty, the stated date of maturity of the obligation (and commencing on the date interest could first be payable thereunder), or (ii) in the case of an operating income guaranty, the date through which such guaranty will remain in effect, and (b) with respect to all guarantees not covered by the preceding clause (a), an amount equal to the stated or determinable amount of the primary obligation in respect of which such guaranty is made or, if not stated or determinable, the maximum reasonably anticipated liability in respect thereof (assuming such Person is required to perform thereunder) as recorded on the balance sheet and on the footnotes to the most recent financial statements of the Borrower required to be delivered pursuant to Section 4.4 hereof. Notwithstanding anything contained herein to the contrary, guarantees of completion shall not be deemed to be Contingent Obligations unless and until a claim for payment or performance has been made thereunder, at which time any such guaranty of completion shall be deemed to be a Contingent Obligation in an amount equal to any such claim. Subject to the preceding sentence, (i) in the case of a joint and several guaranty given by such Person and another Person (but only to the extent such guaranty is recourse, directly or indirectly to the Borrower), the amount of the guaranty shall be deemed to be 100% thereof unless and only to the extent that such other Person has delivered Cash or Cash Equivalents to secure all or any part of such Person's guaranteed obligations, (ii) in the case of joint and several guarantees given by a Person in whom the Borrower owns an interest (which guarantees are non-recourse to the Borrower), to the extent the guarantees, in the aggregate, exceed 15% of total real estate investments of such Person, the amount in excess of 15% shall be deemed to be a Contingent Obligation of the Borrower, and (iii) in the case of a guaranty (whether or not joint and several) of an obligation otherwise constituting Debt of such Person, the amount of such guaranty shall be deemed to be only that amount in excess of the amount of the obligation constituting Debt of such Person. Notwithstanding anything contained herein to the contrary, “Contingent Obligations” shall not be deemed to include guarantees of Unused Commitments or of construction loans to the extent the same have not been drawn.

“Control” means the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of a Person, whether through the ability to exercise voting power, by contract or otherwise. “Controlling” and “Controlled” have meanings correlative thereto.

“Credit Party” means the Administrative Agent, the Fronting Bank, the Swingline Lender or any other Bank.

“Debt” of any Person (including Minority Holdings) means, without duplication, (A) (i) the face amount of all indebtedness of such Person for borrowed money or for the deferred purchase price of property or any asset and, (ii) the face amount of all indebtedness of such Person evidenced by a note, bond, debenture or similar instrument (whether or not disbursed in full in the case of a construction loan), (B) the face amount of all letters of credit issued for the account of such Person and, without duplication, all unreimbursed amounts drawn thereunder, (C) as shown on such Person's balance sheet, all Contingent Obligations of such Person, (D) all “mark to market” liabilities of such Person under any interest rate protection agreement (including, without limitation, any interest rate swaps, caps, floors, collars and similar agreements) or other hedging agreements and currency swaps and foreign exchange contracts or similar agreements. For purposes of this Agreement, Debt (other than Contingent Obligations) of the Borrower shall be deemed to include only the Borrower's pro rata share (such share being based upon the Borrower's percentage ownership interest as shown on the Borrower's annual audited financial statements) of the Debt of any Person in which the Borrower, directly or indirectly, owns an interest, provided that such Debt is nonrecourse, both directly and indirectly, to the Borrower.

“Default” means any condition or event which constitutes an Event of Default or which with the giving of notice or lapse of time or both would, unless cured or waived, become an Event of Default.

“Defaulting Lender” means any Bank that (a) has failed, within two Domestic Business Days of the date required to be funded or paid, to (i) fund any portion of its Loans, (ii) fund any portion of its participations in Letters of Credit or Swingline Loans or (iii) pay over to any Credit Party any other amount required to be paid by it hereunder, unless, in the case of clause (i) above, such Bank notifies the Administrative Agent in writing that such failure is the result of such Bank's good faith determination that a condition precedent to funding (specifically identified and including the particular default, if any) has not been satisfied, (b) has notified the Borrower or any Credit Party in writing, or has made a public statement to the effect, that it does not intend or expect to comply with any of its funding obligations under this Agreement (unless such writing or public statement indicates that such position is based on such Bank's good faith determination that a condition precedent (specifically identified and including the particular default, if any) to funding a loan under this Agreement cannot be satisfied) or generally under other agreements in which it commits to extend credit, (c) has failed, within three Domestic Business Days after request by a Credit Party, acting in good faith, to provide a certification in writing from an authorized officer of such Bank

that it will comply with its obligations (and is financially able to meet such obligations) to fund prospective Loans and participations in then outstanding Letters of Credit and Swingline Loans under this Agreement, provided that such Bank shall cease to be a Defaulting Lender pursuant to this clause (c) upon such Credit Party's receipt of such certification in form and substance satisfactory to it and the Administrative Agent, or (d) has become the subject of a Bankruptcy Event.

“Designated Lender” means a special purpose corporation that (i) shall have become a party to this Agreement pursuant to Section 9.6(d), and (ii) is not otherwise a Bank.

“Designated Lender Notes” means promissory notes of the Borrower, substantially in the form of Exhibit A-1 hereto, evidencing the obligation of the Borrower to repay Money Market Loans made by Designated Lenders, and “Designated Lender Note” means any one of such promissory notes issued under Section 9.6(d) hereof.

“Designating Lender” shall have the meaning set forth in Section 9.6(d) hereof.

“Designation Agreement” means a designation agreement in substantially the form of Exhibit H attached hereto, entered into by a Bank and a Designated Lender and accepted by the Administrative Agent.

“Development Properties” means any Real Property Assets which are 100% owned in fee (or leasehold pursuant to a Financeable Ground Lease) by the Borrower, the General Partner or any of their Consolidated Subsidiaries and which are not subject to any Lien (other than Permitted Liens), and which are under development or redevelopment, provided that Real Property Assets shall cease to be Development Properties as of the earlier to occur of (a) the date which is eighteen (18) months after Completion of Construction thereof, and (b) the first fiscal quarter in which the occupancy rate of the applicable Development Property has averaged eighty-five percent (85%) or more.

“Dollar” and “$” mean dollars which are the lawful money of the United States.

“Domestic Business Day” means any day except a Saturday, Sunday or other day on which commercial banks in New York City and Los Angeles are authorized by law to close.

“Domestic Lending Office” means, as to each Bank, its office located within the United States at its address set forth in its Administrative Questionnaire (or identified in its Administrative Questionnaire as its Domestic Lending Office) or such other office within the United States as such Bank may hereafter designate as its Domestic Lending Office by notice to the Borrower and the Administrative Agent; provided that no Bank shall be permitted to change its Domestic Lending Office if as a result of such change either (i) pursuant to the provisions of Section 8.1 or Section 8.2, Borrower would be unable to maintain any Loans as Euro-Dollar Loans; or (ii) Borrower would be required to make any payment to such Bank pursuant to the provisions of Section 8.3 or Section 8.4.

“Eligible Assignee” means one or more banks, finance companies, insurance or other financial institutions which (1) has (or, in the case of a bank which is a subsidiary, such bank's parent has) a rating of its senior debt obligations of not less than Baa-1 by Moody's or a comparable rating by a rating agency acceptable to Administrative Agent, and (2) has total assets in excess of Ten Billion Dollars ($10,000,000,000).

“Environmental Affiliate” means any partnership, or joint venture, trust or corporation in which an equity interest is owned by the Borrower, either directly or indirectly.

“Environmental Approvals” means any permit, license, approval, ruling, variance, exemption or other authorization required under applicable Environmental Laws by a court or governmental agency having jurisdiction.

“Environmental Claim” means, with respect to any Person, any notice, claim, demand or similar communication (written or oral) by any other Person alleging potential liability for investigatory costs, cleanup costs, governmental response costs, natural resources damage, property damage, personal injuries, fines or penalties arising out of, based on or resulting from (i) the presence, or release into the environment, of any Material of Environmental Concern at any location, whether or not owned by such Person or (ii) circumstances forming the basis of any violation, or alleged violation, of any Environmental Law, in each case as to which could reasonably be expected to have a Material Adverse Effect.

“Environmental Laws” means any and all federal, state, local and foreign statutes, laws, judicial decisions, regulations, ordinances, rules, judgments, orders, decrees, plans, injunctions, permits, concessions, grants, franchises, licenses, agreements and other governmental restrictions relating to the environment, the effect of the environment on human health or to emissions, discharges or releases of pollutants, contaminants, Material of Environmental Concern or hazardous wastes into

the environment including, without limitation, ambient air, surface water, ground water, or land, or otherwise relating to the manufacture, processing, distribution, use, treatment, storage, disposal, transport or handling of pollutants, contaminants, Material of Environmental Concern or hazardous wastes or the clean-up or other remediation thereof.

“Environmental Report” has the meaning set forth in Section 4.7.

“ERISA” means the Employee Retirement Income Security Act of 1974, as amended, or any successor statute.

“ERISA Group” means the Borrower, any Subsidiary and all members of a controlled group of corporations and all trades or businesses (whether or not incorporated) under common control which, together with the Borrower or any Subsidiary, are treated as a single employer under Section 414 of the Internal Revenue Code.

“Euro-Dollar Borrowing” has the meaning set forth in Section 1.4.

“Euro-Dollar Business Day” means any Domestic Business Day on which commercial banks are open for international business (including dealings in dollar deposits) in London.

“Euro-Dollar Lending Office” means, as to each Bank, its office, branch or Affiliate located at its address set forth in its Administrative Questionnaire (or identified in its Administrative Questionnaire as its Euro-Dollar Lending Office) or such other office, branch or Affiliate of such Bank as it may hereafter designate as its Euro-Dollar Lending Office by notice to the Borrower and the Administrative Agent; provided that no Bank shall be permitted to change its Euro-Dollar Lending Office if as a result of such change either (i) pursuant to the provisions of Section 8.1 or Section 8.2, Borrower would be unable to maintain any Loans as Euro-Dollar Loans; or (ii) Borrower would be required make any payment to such Bank pursuant to the provisions of Sections 8.3 or Section 8.4.

“Euro-Dollar Loan” means a Committed Loan to be made by a Bank as a Loan bearing interest at the Adjusted London Interbank Offered Rate in accordance with the applicable Notice of Committed Borrowing or Notice of Interest Rate Election.

“Euro-Dollar Reserve Percentage” has the meaning set forth in Section 2.7(b).

“Event of Default” has the meaning set forth in Section 6.1.

“Existing Credit Agreement” has the meaning set forth in the Recitals.

“Extended Maturity Date” means (x) October 3, 2017, if the first extension option set forth in Section 2.9(a) has been exercised or (y) April 3, 2018, if the second extension option set forth in Section 2.9(a) has been exercised.

“Extension Effective Date” has the meaning set forth in Section 2.9.

“Extension Fee” has the meaning set forth in Section 2.8(d).

“FATCA” means Sections 1471 through 1474 of the Internal Revenue Code, as of the date of this Agreement (or any amended or successor version that is substantively comparable and not materially more onerous to comply with), any current or future regulations or official interpretations thereof and any agreements entered into pursuant to Section 1471(b)(1) of the Code.

“Federal Funds Rate” means, for any day, the rate per annum (rounded upward, if necessary, to the nearest 1/100th of 1%) equal to the weighted average of the rates on overnight Federal funds transactions with members of the Federal Reserve System arranged by Federal funds brokers on such day, as published by the Federal Reserve Bank of New York on the Domestic Business Day next succeeding such day; provided that (i) if such day is not a Domestic Business Day, the Federal Funds Rate for such day shall be such rate on such transactions on the next preceding Domestic Business Day as so published on the next succeeding Domestic Business Day, and (ii) if no such rate is so published on such next succeeding Domestic Business Day, the Federal Funds Rate for such day shall be the average of the rates, quoted to the Administrative Agent from at least three federal funds brokers of recognized standing selected by the Administrative Agent, on such day on such transactions as determined by the Administrative Agent.

“Federal Reserve Board” means the Board of Governors of the Federal Reserve System as constituted from time to time.

“FFO” means “funds from operations,” defined to mean net income (or loss) (computed in accordance with GAAP), excluding gains (or losses) from debt restructurings and sales of properties, plus depreciation and amortization, after adjustments for Minority Holdings. Adjustments for Minority Holdings will be calculated to reflect FFO on the same basis as above.

“Financeable Ground Lease” means either (x) a ground lease reasonably satisfactory to the Required Banks, or (y) a ground lease which provides (i) for a remaining term of not less than 25 years (including options and renewals), (ii) that the ground lease will not be terminated until any leasehold mortgagee shall have received notice of a default and has had a reasonable opportunity to cure the same or complete foreclosure, and has failed to do so, (iii) for a new lease on substantially the same terms to any leasehold mortgagee recognized under such ground lease as tenant if the ground lease is terminated for any reason, (iv) for non-merger of the fee and leasehold estates, and (v) transferability of the tenant's interest under the ground lease, subject only to the landlord's reasonable approval. Notwithstanding the foregoing, it is hereby agreed that the ground lease with respect to the Real Property Asset commonly known as “Kilroy Airport Center, Long Beach, California”, shall be deemed to be a “Financeable Ground Lease”.

“Fitch” means Fitch, Inc. or any successor thereto.

“FMV Cap Rate” means 6.75%.

“Fronting Bank” shall mean JPMorgan Chase Bank, N.A. or such other Bank which Borrower is notified by the Administrative Agent may be a Fronting Bank and which is designated by Borrower in its Notice of Borrowing as the Bank which shall issue a Letter of Credit with respect to such Notice of Borrowing.

“GAAP” means generally accepted accounting principles in the United States recognized as such in the opinions and pronouncements of the Accounting Principles Board and the American Institute of Certified Public Accountants and Board or in such other statements by such other entity as may be approved by a significant segment of the accounting profession within the United States, which are applicable to the circumstances as of the date of determination.

“General Partner” means Kilroy Realty Corporation, a Maryland corporation.

“Governmental Authority” means any Federal, state or local government or any other political subdivision thereof or agency exercising executive, legislative, judicial, regulatory or administrative functions having jurisdiction over the Borrower or any Real Property Asset.

“Group of Loans” means, at any time, a group of Loans consisting of (i) all Committed Loans which are Base Rate Loans at such time, or (ii) all Committed Loans which are Euro-Dollar Loans having the same Interest Period at such time; provided that, if a Loan of any particular Bank is converted to or made as a Base Rate Loan pursuant to Section 8.2 or 8.4, such Loan shall be included in the same Group or Groups of Loans from time to time as it would have been in if it had not been so converted or made.

“Guaranty” means the Guaranty of Payment, of even date herewith, made by the General Partner.

“Indemnitee” has the meaning set forth in Section 9.3(b).

“Interest Period” means: (i) with respect to each Euro-Dollar Borrowing, the period commencing on the date of such Committed Borrowing or of any Notice of Interest Rate Election with respect to such Committed Borrowing and ending one, two, three, six or, if available from all of the Banks, nine or twelve months thereafter (or a period of seven (7) or fourteen (14) days, not more frequently than twice in any calendar quarter, unless any Bank has previously advised the Administrative Agent and the Borrower that it does not accept, in its sole discretion, the Offered Rate), as the Borrower may elect in the applicable Notice of Committed Borrowing or Notice of Interest Rate Election; provided that:

(a)    any Interest Period which would otherwise end on a day which is not a Euro-Dollar Business Day shall be extended to the next succeeding Euro-Dollar Business Day unless such Euro-Dollar Business Day falls in another calendar month, in which case such Interest Period shall end on the next preceding Euro-Dollar Business Day;

(b)    any Interest Period which begins on the last Euro-Dollar Business Day of a calendar month (or on a day for which there is no numerically corresponding day in the calendar month at the end of such Interest Period) shall end on the last Euro-Dollar Business Day of a calendar month; and

(c)    any Interest Period which would otherwise end after the Maturity Date shall end on the Maturity Date.

(ii)    with respect to each Base Rate Borrowing, the period commencing on the date of such Committed Borrowing or Notice of Interest Rate Election and ending 30 days thereafter; provided that any Interest Period which would otherwise end on a day which is not a Domestic Business Day shall be extended to the next succeeding Domestic Business Day; and provided that any Interest Period which would otherwise end after the Maturity Date shall end on the Maturity Date.

(iii)    with respect to each Money Market LIBOR Loan, the period commencing on the date of borrowing specified in the applicable Notice of Borrowing and ending one, two, three or, if available from all applicable Banks, six months thereafter, as the Borrower may elect in the applicable Notice of Money Market Borrowing in accordance with Section 2.3; provided that:

(a)    any Interest Period which would otherwise end on a day which is not a Euro-Dollar Business Day shall be extended to the next succeeding Euro-Dollar Business Day unless such Euro-Dollar Business Day falls in another calendar month, in which case such Interest Period shall end on the next preceding Euro-Dollar Business Day;

(b)    any Interest Period which begins on the last Euro-Dollar Business Day of a calendar month (or on a day for which there is no numerically corresponding day in the calendar month at the end of such Interest Period) shall, subject to clause (c) below, end on the last Euro-Dollar Business Day of a calendar month;

(c)    if any Interest Period includes a date on which a payment of principal of Loans is required to be made under Section 2.10 but does not end on such date, then (i) the principal amount (if any) of each Money Market LIBOR Loan required to be repaid on such date and (ii) the remainder (if any) of each such Money Market LIBOR Loan shall have an Interest Period determined as set forth above; and

(d)    any Interest Period which would otherwise end after the Maturity Date shall end on the Maturity Date.

(iv)    with respect to each Money Market Absolute Rate Loan, the period commencing on the date of borrowing specified in the applicable Notice of Borrowing and ending such number of days thereafter (but not less than 14 days nor more than 180 days) as the Borrower may elect in accordance with Section 2.3; provided that:

(a)    any Interest Period which would otherwise end on a day which is not a Euro-Dollar Business Day shall be extended to the next succeeding Euro-Dollar Business Day;

(b)    if any Interest Period includes a date on which a payment of principal of Loans is required to be made under Section 2.10 but does not end on such date, then (i) the principal amount (if any) of each Money Market Absolute Rate Loan required to be repaid on such date and (ii) the remainder (if any) of each such Money Market Absolute Rate Loan shall have an Interest Period determined as set forth above; and

(c)    any Interest Period which would otherwise end after the Maturity Date shall end on the Maturity Date.

“Internal Revenue Code” means the Internal Revenue Code of 1986, as amended, or any successor statute.

“IntraLinks” means an electronic service provider that provides a secure means to post information via the internet, at all times accessible by the Administrative Agent and the Banks.

“Investment Grade Rating” means a rating for a Person's senior long-term unsecured debt, or if no such rating has been issued, a “shadow” rating, of BBB- or better from S&P, and a rating or “shadow” rating of Baa3 or better from Moody's or a rating or “shadow” rating equivalent to the foregoing from Fitch. Any such “shadow” rating shall be evidenced by a letter from the applicable Rating Agency or by such other evidence as may be reasonably acceptable to the Administrative

Agent (as to any such other evidence, the Administrative Agent shall present the same to, and discuss the same with, the Banks).

“Joint Bookrunner” shall mean each of J.P. Morgan Securities LLC and Merrill Lynch, Pierce, Fenner & Smith Incorporated in their respective capacities as joint bookrunner, and their respective successors in such capacity.

“Joint Lead Arranger” shall mean each of J.P. Morgan Securities LLC and Merrill Lynch, Pierce, Fenner & Smith Incorporated in their respective capacities as joint lead arranger, and their respective successors in such capacity.

“Letter(s) of Credit” has the meaning provided in Section 2.2(b).

“Letter of Credit Collateral” has the meaning provided in Section 6.4.

“Letter of Credit Collateral Account” has the meaning provided in Section 6.4.

“Letter of Credit Documents” has the meaning provided in Section 2.17.

“Letter of Credit Usage” means at any time the sum of (i) the aggregate maximum amount available to be drawn under the Letters of Credit then outstanding, assuming compliance with all requirements for drawing referred to therein, and (ii) the aggregate amount of the Borrower's unpaid obligations under this Agreement in respect of the Letters of Credit.

“LIBOR Auction” means a solicitation of Money Market Quotes setting forth Money Market Margins based on the London Interbank Offered Rate pursuant to Section 2.3.

“Lien” means, with respect to any asset, any mortgage, lien, pledge, charge, security interest or encumbrance of any kind, or any other type of preferential arrangement that has the practical effect of creating a security interest, in respect of such asset. For the purposes of this Agreement, each of the Borrower and any Subsidiary shall be deemed to own subject to a Lien any asset which it has acquired or holds subject to the interest of a vendor or lessor under any conditional sale agreement, capital lease or other title retention agreement relating to such asset.

“Loan” means a Base Rate Loan, a Euro-Dollar Loan, a Money Market Loan or a Swingline Loan and “Loans” means Base Rate Loans, Euro-Dollar Loans, Money Market Loans or Swingline Loans or any combination of the foregoing.

“Loan Amount” means Five Hundred Million and 00/100 Dollars ($500,000,000) (as adjusted pursuant to Section 9.17).

“Loan Documents” means this Agreement, the Notes, the Guaranty, the Letter(s) of Credit, the Letter of Credit Documents and any related documents.

“London Interbank Offered Rate” has the meaning set forth in Section 2.7(b).

“Mandatory Borrowing” has the meaning set forth in Section 2.18(b)(iii).

“Margin Stock” shall have the meaning provided such term in Regulation U, Regulation T and Regulation X of the Federal Reserve Board.

“Material Adverse Effect” means a material adverse effect upon (i) the business, operations, properties or assets of the Borrower or (ii) the ability of the Borrower to perform its obligations hereunder in all material respects, including to pay interest and principal.

“Material of Environmental Concern” means and includes pollutants, contaminants, hazardous wastes, and toxic, radioactive, caustic or otherwise hazardous substances, including petroleum, its derivatives, by-products and other hydrocarbons, or any substance having any constituent elements displaying any of the foregoing characteristics.

“Material Plan” means at any time a Plan having aggregate Unfunded Liabilities in excess of $5,000,000.

“MaterialSubsidiary” means any Subsidiary of the Borrower and/or the General Partner to which 10% or more of Total Asset Value is attributable.

“Maturity Date” means either (a) the Original Maturity Date, or (b) the then applicable Extended Maturity Date, if one or both of the extension options set forth in Section 2.9(a) has been exercised.

“Maximum Rate” has the meaning set forth in Section 9.19.

“Minority Holdings” means partnerships, limited liability companies and corporations held or owned by the Borrower which are not consolidated with the Borrower on its financial statements.

“Money Market Absolute Rate” has the meaning set forth in Section 2.3(d)(ii)(4).

“Money Market Absolute Rate Loan” means a Loan to be made by a Bank pursuant to an Absolute Rate Auction.

“Money Market Lending Office” means, as to each Bank, its Domestic Lending Office or such other office, branch or Affiliate of such Bank as it may hereafter designate as its Money Market Lending Office by notice to the Borrower and the Administrative Agent; provided that any Bank may from time to time by notice to the Borrower and the Administrative Agent designate separate Money Market Lending Offices for its Money Market LIBOR Loans, on the one hand, and its Money Market Absolute Rate Loans, on the other hand, in which case all references herein to the Money Market Lending Office of such Bank shall be deemed to refer to either or both of such offices, as the context may require.

“Money Market LIBOR Loan” means a Loan to be made by a Bank pursuant to a LIBOR Auction (including such a loan bearing interest at the Base Rate pursuant to Section 2.3).

“Money Market Loan” means a Money Market LIBOR Loan or a Money Market Absolute Rate Loan.

“Money Market Margin” has the meaning set forth in Section 2.3(d)(ii)(3).

“Money Market Quote” means an offer by a Bank to make a Money Market Loan in accordance with Section 2.3.

“Money Market Quote Request” means a, invitation substantially in the form of Exhibit E hereto.

“Moody's” means Moody's Investors Service, Inc. or any successor thereto.

“Multiemployer Plan” means at any time a “multiemployer plan” within the meaning of Section 4001(a)(3) of ERISA to which any member of the ERISA Group is then making or accruing an obligation to make contributions or has within the preceding five plan years made contributions, including for these purposes any Person which ceased to be a member of the ERISA Group during such five year period.

“Net Offering Proceeds” means all cash received by the Borrower or the General Partner as a result of the sale of common shares of beneficial interest, preferred shares of beneficial interest (including perpetual preferred), partnership interests, limited liability company interests, or other ownership or equity interests in the Borrower or the General Partner (or evidence of indebtedness of the Borrower or the General Partner convertible into any of the foregoing) less customary costs and discounts of issuance paid by the Borrower or the General Partner, as the case may be.

“New Acquisition” shall mean any Real Property Asset acquired after the date hereof.

“Non-Recourse Debt” means Debt of the Borrower or the General Partner on a consolidated basis for which the right of recovery of the obligee thereof is limited to recourse against the Real Property Assets securing such Debt (subject to such limited exceptions to the non-recourse nature of such Debt such as fraud, misappropriation, misapplication and environmental indemnities, as are usual and customary in like transactions at the time of the incurrence of such Debt).

“Notes” means, collectively, the promissory notes of the Borrower, each substantially in the form of Exhibit A hereto, evidencing the obligation of the Borrower to repay the Loans, together with any Designated Lender Notes, and “Note” means any one of such promissory notes issued hereunder.

“Notice of Borrowing” means a Notice of Committed Borrowing or a Notice of Money Market Borrowing.

“Notice of Committed Borrowing” has the meaning set forth in Section 2.2.

“Notice of Interest Rate Election” has the meaning set forth in Section 2.15(a).

“Notice of Money Market Borrowing” has the meaning set forth in Section 2.3(f).

“Obligations” means all obligations, liabilities and indebtedness of every nature of the Borrower from time to time owing to any Bank under or in connection with this Agreement or any other Loan Document, including, without limitation, (i) the outstanding principal amount of the Committed Loans at such time, plus (ii) the Letter of Credit Usage at such time, plus (iii) the outstanding principal amount of any Money Market Loans at such time.

“Offered Rate” means a rate per annum quoted by the Administrative Agent, plus the Applicable Margin for Euro-Dollar Loans, for an Interest Period of seven (7) or fourteen (14) days.

“Original Maturity Date” means April 3, 2017.

“Other Connection Taxes” means, with respect to the Administrative Agent and any Bank, Taxes imposed as a result of a present or former connection between such Administrative Agent or Bank and the jurisdiction imposing such Tax (other than connections arising from such Administrative Agent or Bank having executed, delivered, become a party to, performed its obligations under, received payments under, received or perfected a security interest under, engaged in any other transaction pursuant to or enforced any Loan Document, or sold or assigned an interest in any Loan or Loan Document).

“Other Taxes” has the meaning set forth in Section 8.4.

“Outstanding Balance” means the sum of (i) the aggregate outstanding and unpaid principal balance of all Loans and (ii) the Letter of Credit Usage.

“Parent” means, with respect to any Bank, any Person as to which such Bank is, directly or indirectly, a subsidiary.

“Participant Register” has the meaning set forth in clause (g) of Section 9.6.

“Participant” has the meaning set forth in Section 9.6(b).

“PBGC” means the Pension Benefit Guaranty Corporation or any entity succeeding to any or all of its functions under ERISA.

“Permitted Liens” means (a) Liens in favor of the Borrower or the General Partner on all or any part of the assets of Subsidiaries of the Borrower or the General Partner, as applicable, provided that (i) the Debt to which such Lien relates is held by the Borrower, (ii) such Debt is not otherwise pledged or encumbered, and (iii) no more than 5% of the Unencumbered Asset Pool Properties Value may be subject to any such Liens; (b) Liens to secure the performance of statutory obligations, surety or appeal bonds, performance bonds, completion bonds, government contracts or other obligations of a like nature, including Liens in connection with workers' compensation, unemployment insurance and other types of statutory obligations or to secure the performance of tenders, bids, leases, contracts (other than for the repayment of Debt) and other similar obligations incurred in the ordinary course of business; (c) Liens for taxes, assessments or governmental charges or claims that are not yet delinquent or that are being contested in good faith by appropriate proceedings promptly instituted and diligently concluded; provided, that any reserve or other appropriate provision as shall be required in conformity with GAAP shall have been made therefor; (d) Liens on property of the Borrower, the General Partner or any Subsidiary thereof in favor of the Federal or any state government to secure certain payments pursuant to any contract, statute or regulation; (e) easements (including, without limitation, reciprocal easement agreements and utility agreements), rights of way, covenants, consents, reservations, encroachments, variations and zoning and other restrictions, charges or encumbrances (whether or not recorded), which do not interfere materially with the ordinary conduct of the business of the Borrower, the General Partner or any Subsidiary thereof and which do not materially detract from the value of the property to which they attach or materially impair the use thereof by the Borrower, the General Partner or any Subsidiary thereof; (f) statutory Liens of carriers, warehousemen, mechanics, suppliers, materialmen, repairmen or other Liens imposed by law and arising in the ordinary course of business, for sums due and payable which are not then past due (or which, if past due, are being contested in good faith and with respect to which adequate reserves are being maintained to the extent required by GAAP); (g) Liens not otherwise permitted by this definition and incurred in the ordinary course of business of any or all of the Borrower, the General Partner or any Subsidiary thereof with respect to obligations which do not exceed $500,000 in principal amount in the aggregate at any one time outstanding; and (h) the interests of lessees and lessors under leases of real or personal property made in the ordinary course of business which would not have a Material Adverse Effect.

“Person” means an individual, a corporation, a partnership, a limited liability company, an association, a trust or any other entity or organization, including a government or political subdivision or an agency or instrumentality thereof.

“Plan” means at any time an employee pension benefit plan (within the meaning of Section 3(2) of ERISA, other than a Multiemployer Plan) which is covered by Title IV of ERISA or subject to the minimum funding standards under Section 412 of the Internal Revenue Code and either (i) is maintained, or contributed to, by any member of the ERISA Group for employees of any member of the ERISA Group or (ii) has at any time within the preceding five years been maintained, or contributed to, by any Person which was at such time a member of the ERISA Group for employees of any Person which was at such time a member of the ERISA Group.

“Prime Rate” means the rate of interest publicly announced by the Administrative Agent in New York City from time to time as its Prime Rate.

“Qualified Institution” has the meaning set forth in Section 9.17.

“Quotation Date” has the meaning set forth in Section 2.7(b).

“Rating Agencies” means, collectively, S&P, Moody's and Fitch.

“Real Property Assets” means as of any time, the real property assets owned directly or indirectly by the Borrower, the General Partner and/or their Consolidated Subsidiaries at such time, and “Real Property Asset” means any one of them.

“Recourse Debt” shall mean Debt of the Borrower, the General Partner or any Consolidated Subsidiary that is not Non-Recourse Debt.

“Reference Bank” means the principal London offices of the Administrative Agent.

“Regulation T” means Regulation T of the Board of Governors of the Federal Reserve System, as in effect from time to time.

“Regulation U” means Regulation U of the Board of Governors of the Federal Reserve System, as in effect from time to time.

“Regulation X” means Regulation X of the Board of Governors of the Federal Reserve System, as in effect from time to time.

“Regulatory Change” has the meaning set forth in Section 8.3(a).

“Release” means any release, spill, emission, leaking, pumping, pouring, dumping, emptying, deposit, discharge, leaching or migration.

“Required Banks” means, at any time, Banks having at least fifty-one percent (51%) of the aggregate amount of the Commitments or, if the Commitments shall have been terminated, holding Notes evidencing at least fifty-one percent (51%) of the aggregate unpaid principal amount of the Loans (provided, that in the case of Swingline Loans, the amount of each Bank's funded participation interest in such Swingline Loans shall be considered for purposes hereof as if it were a direct loan and not a participation interest, and the aggregate amount of Swingline Loans owing to the Swingline Lender shall be considered for purposes hereof as reduced by the amount of such funded participation interests); provided, however, that no Defaulting Lender shall be permitted to vote on any matter requiring the vote of the Required Banks and for purposes of determining the Required Banks the Commitment of such Bank or the unpaid principal amount of Loan evidenced by Notes held by such Bank, as applicable, shall not be counted.

“S&P” means Standard & Poor's Ratings Service, a division of The McGraw-Hill Companies, Inc., or any successor thereto.

“Secured Debt” means all Debt secured by a Lien on real property.

“Separate Parcel” means a Real Property Asset that is a single, legally subdivided, separately zoned parcel that can be legally transferred or conveyed separate and distinct from any other Real Property Asset without benefit of any other Real Property Asset.

“Solvent” means, with respect to any Person, that the fair saleable value of such Person's assets exceeds the Debts of such Person.

“Subsidiary” means any corporation or other entity of which securities or other ownership interests representing either (i) ordinary voting power to elect a majority of the board of directors or other persons performing similar functions or (ii) a majority of the economic interest therein, are at the time directly or indirectly owned by the Borrower.

“Swingline Borrowing” has the meaning set forth in Section 1.4.

“Swingline Commitment” has the meaning set forth in Section 2.18(a).

“Swingline Lender” means JPMorgan Chase Bank, N.A., in its capacity as swingline lender hereunder, and its permitted successors in such capacity in accordance with the terms of this Agreement.

“Swingline Loan” means a loan made by the Swingline Lender pursuant to Section 2.18.

“Syndication Agent” means Bank of America, N.A., in its capacity as syndication agent for the Banks, and its successors in such capacity.

“Taxes” has the meaning set forth in Section 8.4.

“Term” has the meaning set forth in Section 2.9(b).

“Total Asset Value” means, the sum of (w) with respect to each Real Property Asset for which there is a valid certificate of occupancy or a representation from the Borrower that it is legally permitted to occupy such Real Property Asset and is not less than 85% leased and occupied as of the last day of the applicable fiscal quarter, the quotient of (i) Adjusted Annual EBITDA (calculated after giving effect to any required free rent periods by calculating the average cash rent over the term of the lease during such free rent periods) with respect thereto for the previous four (4) consecutive quarters (or, if (A) owned for less than four (4) quarters, the Adjusted Annual EBITDA (calculated after giving effect to any required free rent periods by calculating the average cash rent over the term of the lease during such free rent periods) for such period, annualized, or (B) 85% leased and occupied for less than a full fiscal quarter, the Adjusted Annual EBITDA (calculated after giving effect to any required free rent periods by calculating the average cash rent over the term of the lease during such free rent periods) for the period so leased and occupied (whether or not owned for the previous four (4) fiscal quarters), annualized), including the quarter then ended, but less reserves for Capital Expenditures of (A) $0.30 per square foot per annum for each Real Property Asset that is an office property, and (B) $0.15 per square foot per annum for each Real Property Asset that is an industrial property, divided by (ii) the FMV Cap Rate, (x) with respect to each Real Property Asset for which there is a valid certificate of occupancy or a representation from the Borrower that it is lawfully permitted to occupy such Real Property Asset but which is or has been less than 85% leased or occupied for four full consecutive fiscal quarters, an amount equal to 75% of the book value thereof, net of impairment charges, provided, however, that if any such Real Property Asset shall remain less than 85% leased or occupied for more than 24 consecutive months, then the value thereof shall be equal to 50% of book value, (y) with respect to land and Development Properties, the lesser of (i) the cost actually paid by the Borrower, the General Partner or any of their Subsidiaries, and (ii) the market value, each as determined in accordance with GAAP, of such land or Development Properties, and (z) Unrestricted Cash or Cash Equivalents of the Borrower, the General Partner and their Subsidiaries as of the date of determination;

provided that for purposes of determining Total Asset Value, the aggregate contributions to Total Asset Value from investments in land and Development Properties and from the Borrower's and the General Partner's interests in any joint venture, whether consolidated or unconsolidated, shall not exceed 30% of Total Asset Value.

“Total Debt” means the sum of the balance sheet amount of all Debt of the Borrower, the General Partner and their Consolidated Subsidiaries. Total Debt shall not be determined in accordance with GAAP, but instead shall be equal to the sum of the stated principal amount of each item of Debt.

“Total Debt Ratio” means the ratio, as of the date of determination, of (i) the sum of (x) the Total Debt of the Borrower, the General Partner and their Consolidated Subsidiaries and (y) the Borrower's and the General Partner's pro rata share of the Total Debt of any Minority Holdings of the Borrower or the General Partner to (ii) Total Asset Value.

“Total Debt Service” means, as of the last day of each calendar quarter, an amount equal to the sum of (i) interest (whether accrued, paid or capitalized) payable by Borrower on its Debt for the previous four consecutive quarters including the quarter then ended, plus (ii) scheduled payments of principal on such Debt, whether or not paid by the Borrower (excluding balloon payments) for the previous four consecutive quarters including the quarter then ended, plus (iii) the Borrower's and the General Partner's pro rata share of the Total Debt Service of any Minority Holdings of the Borrower or the General Partner.

“Unencumbered Asset Pool Net Operating Cash Flow” means, as of any date of determination the Adjusted Annual EBITDA attributable to the Unencumbered Asset Pool Properties. Notwithstanding the foregoing, with respect to any Unencumbered Asset Pool Property owned by the Borrower, the General Partner or any of their Consolidated Subsidiaries for a period of less four (4) fiscal quarters, Unencumbered Asset Pool Net Operating Cash Flow shall be determined in a manner consistent with the foregoing calculation utilizing annualized Adjusted Annual EBITDA for the relevant period of the Borrower's, the General Partner's or any of their Consolidated Subsidiaries' ownership of such Unencumbered Asset Pool Property.

“Unencumbered Asset Pool Properties” means, as of any date, the Real Property Assets listed in Exhibit B and Exhibit C attached hereto and made a part hereof, together with all Real Property Assets which have become part of the Unencumbered Asset Pool Properties as of such date, each of which is:

(i)    located in the United States;

(ii)    100% owned in fee (or leasehold pursuant to a Financeable Ground Lease in the case of assets listed on Exhibit C as leaseholds) by (x) the Borrower or (y) a wholly-owned direct or indirect Subsidiary of the Borrower and/or the General Partner that is not liable for any Debt and is not the subject of a Bankruptcy Event;

(iii)    either a completed industrial property or primarily a completed office property which may have secondary uses or a Development Property which will be either an industrial or office property or a mortgage note;

(iv)    not subject to any Lien (other than Permitted Liens);

(v)    in the case of a Real Property Asset owned or leased by a wholly-owned Subsidiary, not subject to any agreement or arrangement by which the direct or indirect equity interests in such Subsidiary are subject to any Lien (other than Permitted Liens); and

(vi)    not subject to any agreement or arrangement that prohibits or restricts the creation or assumption of any Lien on the assets of, or equity interests in, the Borrower or Subsidiary that owns or leases such Real Property Asset.

“Unencumbered Asset Pool Properties Value” means the sum of:

(i)    with respect to the Unencumbered Asset Pool Properties for which there is a valid certificate of occupancy or a representation from the Borrower that it is legally permitted to occupy such Real Property Asset and which is not less than 85% leased and occupied as of the last day of the applicable fiscal quarter, the quotient of (x) the Unencumbered Asset Pool Net Operating Cash Flow (calculated after giving effect to any required free rent periods by calculating the average cash rent over the term of the lease during such free rent periods) with respect thereto for the previous four (4) consecutive quarters (or if (A) owned for less than four (4) quarters, the Unencumbered Asset Pool Net Operating Cash Flow (calculated after giving effect to any required free rent periods by calculating the average cash rent over the term of the lease during such free rent periods) for such period, annualized, or (B) 85% leased and occupied for less than a full fiscal quarter, the Unencumbered Asset Pool Net Operating Cash Flow (calculated after giving effect to any required free rent periods by calculating the average cash rent over the term of the lease during such free rent periods) for the period so leased and occupied (whether or not owned for the previous four (4) fiscal quarters), annualized), including the quarter then ended, but less reserves for Capital Expenditures of (A) $0.30 per square foot per annum for each Unencumbered Asset Pool Property that is an office property, and (B) $0.15 per square foot per annum for each Unencumbered Asset Pool Property that is an industrial property, divided by (y) the FMV Cap Rate, provided, however, that if any such Unencumbered Asset Pool Property shall have been less than 85% leased and occupied for four (4) full consecutive fiscal quarters, then the value thereof shall be equal to an amount equal to 75% of the book value thereof, net of impairment charges, provided, however, that if any such Real Property Asset

shall remain less than 85% leased or occupied for more than 24 consecutive months, then the value thereof shall be equal to 50% of book value; and

(ii)    with respect to the Unencumbered Asset Pool Properties which are Development Properties or mortgage notes, fifty percent (50%) of (A) in the case of Development Properties, the lesser of (A) the cost actually paid by the Borrower, the General Partner or any of their Subsidiaries, and (B) the market value, each as determined in accordance with GAAP, of such Development Properties, and (B) in the case of mortgage notes, the book value thereof, determined in accordance with GAAP, provided that the value attributable to Development Properties and mortgage notes, in the aggregate shall not at any time exceed 15% of Unencumbered Asset Pool Properties Value.

“Unfunded Liabilities” means, with respect to any Plan at any time, the amount (if any) by which (i) the value of all benefit liabilities under such Plan, determined on a plan termination basis using the assumptions prescribed by the PBGC for purposes of Section 4044 of ERISA, exceeds (ii) the fair market value of all Plan assets allocable to such liabilities under Title IV of ERISA (excluding any accrued but unpaid contributions), all determined as of the then most recent valuation date for such Plan, but only to the extent that such excess represents a potential liability of a member of the ERISA Group to the PBGC or any other Person under Title IV of ERISA.

“United States” means the United States of America, including the States and the District of Columbia, but excluding its territories and possessions.

“Unrestricted Cash or Cash Equivalents” means Cash or Cash Equivalents that is not subject to any pledge, lien or control agreement, less (i) $35,000,000, (ii) amounts normally and customarily set aside by Borrower for operating, capital and interest reserves, and (iii) amounts placed with third parties as deposits or security for contractual obligations.

“Unsecured Debt” means Debt not secured by a Lien on real property.

“Unsecured Debt Ratio” means, as of any date of determination, the ratio of the Unencumbered Asset Pool Properties Value as of the date of determination to the aggregate amount of Unsecured Debt of the Borrower, the General Partner and their Consolidated Subsidiaries outstanding as of such date of determination.

“Unsecured Debt Service” means, for any calendar quarter, the interest actually payable (or accrued) on the Loans and all other Unsecured Debt.

“Unused Commitments” means an amount equal to all unadvanced funds (other than unadvanced funds in connection with any construction loan) which any third party is obligated to advance to the Borrower or otherwise, pursuant to any Loan Document, written instrument or otherwise.

Section 3.Accounting Terms and Determinations. Unless otherwise specified herein, all accounting terms used herein shall be interpreted, all accounting determinations hereunder shall be made, and all financial statements required to be delivered hereunder shall be prepared in accordance with GAAP, applied on a basis consistent (except for changes concurred in by the Borrower's independent public accountants) with the most recent audited consolidated financial statements of the Borrower delivered to the Administrative Agent and the Banks; provided that, if the Borrower notifies the Administrative Agent and the Banks that the Borrower wishes to amend any covenant in Article V to eliminate the effect of any change in GAAP on the operation of such covenant (or if the Administrative Agent notifies the Borrower that the Required Banks wish to amend Article V for such purpose), then the Borrower's compliance with such covenant shall be determined on the basis of GAAP in effect immediately before the relevant change in GAAP became effective, until either such notice is withdrawn or such covenant is amended in a manner satisfactory to the Borrower and the Required Banks.

Section 4.Types of Borrowings. The term “Borrowing” denotes the aggregation of Loans of one or more Banks to be made to the Borrower pursuant to Article II on the same date, all of which Loans are of the same type (subject to Article VIII) and, except in the case of Base Rate Loans, Money Market Absolute Rate Loans and Swingline Loans, have the same Interest Period. Borrowings are classified for purposes of this Agreement either by reference to the pricing of Loans comprising such Borrowing (e.g., a “Euro-Dollar Borrowing” is a Borrowing comprised of Euro-Dollar Loans) or by reference to the provisions of Article II under which participation therein is determined (i.e., a “Committed Borrowing” is a Borrowing under Section 2.1 in which all Banks participate in proportion to their Commitments, while a “Money Market Borrowing” is a Borrowing under Section 2.3, and a “Swingline Borrowing” is a Borrowing under Section 2.18 in which only the Swingline Lender participates (subject to the provisions of said Section 2.18)).

THE CREDITS

Section 5.Commitments to Lend. Each Bank severally agrees, on the terms and conditions set forth in this Agreement, to make Committed Loans to the Borrower and participate in Letters of Credit issued by the Fronting Bank on behalf of the Borrower pursuant to this Section from time to time during the Term in amounts such that the aggregate principal amount of Committed Loans by such Bank at any one time outstanding plus such Bank's Commitment Percentage of Swingline Loans outstanding together with such Bank's Commitment Percentage of the Letter of Credit Usage shall not exceed the amount of its Commitment. The aggregate amount of Committed Loans to be made hereunder together with the Letter of Credit Usage and outstanding Money Market Loans shall not exceed the Loan Amount. Each Borrowing under this subsection (a) shall be in an aggregate principal amount of at least $2,500,000, or an integral multiple of $500,000 in excess thereof and, other than with respect to Money Market Loans and Swingline Loans, shall be made from the several Banks ratably in proportion to their respective Commitments. Subject to the limitations set forth herein, any amounts repaid may be reborrowed.

Section 6.Notice of Committed Borrowing. (a) The Borrower shall give the Administrative Agent notice (a “Notice of Committed Borrowing”) not later than 2:00 p.m. (New York City time) (x) one Domestic Business Day before each Base Rate Borrowing, (y) three (3) Euro-Dollar Business Days before each Euro-Dollar Borrowing, or (z) three (3) Domestic Business Days before each Borrowing bearing interest at the Offered Rate, specifying:

(1)the date of such Borrowing, which shall be a Domestic Business Day in the case of a Base Rate Borrowing or a Borrowing bearing interest at the Offered Rate or a Euro-Dollar Business Day in the case of a Euro-Dollar Borrowing,

(2)the aggregate amount of such Borrowing,

(3)whether the Loans comprising such Borrowing are to be Base Rate Loans, Loans bearing interest at the Offered Rate or Euro-Dollar Loans,

(4)in the case of a Euro-Dollar Borrowing, the duration of the Interest Period applicable thereto, subject to the provisions of the definition of Interest Period,

(5)the intended use for the proceeds of such Borrowing, and

(6)that no Default or Event of Default has occurred or is continuing.

Notwithstanding the time frame set forth in clause (a)(x) above, in the event that the Money Market Quotes submitted by the Banks pursuant to Section 2.3(c) below are, in the aggregate, in an amount less than the principal amount requested by the Borrower in the related Money Market Quote Request, then the Borrower shall be permitted to give the Administrative Agent notice of its intent to make a Base Rate Borrowing, in the amount of the difference between accepted Money Market Quotes and the principal amount requested by Borrower in the related Money Market Quote Request, no later than 2:30 p.m. (New York City time) on the date of such Borrowing.

(a)Borrower shall give the Administrative Agent, and the designated Fronting Bank, written notice in the event that it desires to have Letters of Credit (each, a “Letter of Credit”) issued hereunder no later than 2:00 p.m., New York City time, at least four (4) Domestic Business Days prior to the date of such issuance. Each such notice shall specify (i) the designated Fronting Bank, (ii) the aggregate amount of the requested Letters of Credit, (iii) the individual amount of each requested Letter of Credit and the number of Letters of Credit to be issued, (iv) the date of such issuance (which shall be a Domestic Business Day), (v) the name and address of the beneficiary, (vi) the expiration date of the Letter of Credit (which in no event shall be later than twelve (12) months after the issuance of such Letter of Credit or the Maturity Date, whichever is earlier), (vii) the purpose and circumstances for which such Letter of Credit is being issued and (viii) the terms upon which each such Letter of Credit may be drawn down (which terms shall not leave any discretion to Fronting Bank). Each such notice may be revoked telephonically by the Borrower to the applicable Fronting Bank and the Administrative Agent any time prior to the date of issuance of the Letter of Credit by the applicable Fronting Bank, provided such revocation is confirmed in writing by the Borrower to the Fronting Bank and the Administrative Agent within one (1) Domestic Business Day by facsimile. No later than 2:00 p.m., New York City time, on the date that is four (4) Domestic Business Days prior to the date of issuance, the Borrower shall specify a precise description of the documents and the verbatim text of any certificate to be presented by the beneficiary of such Letter of Credit, which if presented by such beneficiary prior to the expiration date of the Letter of Credit would require the Fronting Bank to make a payment under the Letter of Credit; provided, that Fronting Bank may, in its reasonable judgment, require changes in any such documents and certificates only in conformity with changes in customary and commercially reasonable practice or law and, providedfurther, that no Letter of Credit shall require payment against a conforming draft to be made thereunder on the following Domestic Business Day that such draft is presented if such presentation is made later than 10:00 A.M. New York City time (except that if the beneficiary of any Letter of Credit requests at the time of the issuance of its Letter of Credit that payment be made on the same Domestic Business Day against a conforming draft, such beneficiary shall be entitled to such a same day draw, provided such draft is presented to the applicable Fronting Bank no later than 10:00 A.M. New York City time and provided further the Borrower shall have requested to the Fronting Bank and the Administrative Agent that such beneficiary shall be entitled to a same day draw). In determining whether to pay on such Letter of

Credit, the Fronting Bank shall be responsible only to determine that the documents and certificates required to be delivered under the Letter of Credit have been delivered and that they comply on their face with the requirements of that Letter of Credit.

Section 7.Money Market Borrowings.

(a)The Money Market Option. In addition to Committed Borrowings pursuant to Section 2.1, at such time as the Borrower's Credit Rating is an Investment Grade Rating from at least two Rating Agencies, one of which shall be S&P or Moody's, the Borrower may, as set forth in this Section 2.3, request the Banks during the Term to make offers to make Money Market Loans to the Borrower, not to exceed, at such time, the lesser of (i) the aggregate Commitments less the Outstanding Balance, and (ii) 50% of the aggregate Commitments. The Banks may, but shall have no obligation to, make such offers and the Borrower may, but shall have no obligation to, accept any such offers in the manner set forth in this Section.

(b)Money Market Quote Request. When the Borrower wishes to request offers to make Money Market Loans under this Section, it shall transmit to the Administrative Agent by telex or facsimile transmission a Money Market Quote Request substantially in the form of Exhibit E hereto so as to be received not later than 2:00 p.m. (New York City time) on (x) the fourth Euro-Dollar Business Day prior to the date of Borrowing proposed therein, in the case of a LIBOR Auction, or (y) the Domestic Business Day next preceding the date of Borrowing proposed therein, in the case of an Absolute Rate Auction (or, in either case, such other time or date as the Borrower and the Administrative Agent shall have mutually agreed and shall have notified to the Banks not later than the date of the Money Market Quote Request for the first LIBOR Auction or Absolute Rate Auction for which such change is to be effective) specifying:

(i)the proposed date of Borrowing, which shall be a Euro-Dollar Business Day in the case of a LIBOR Auction or a Domestic Business Day in the case of an Absolute Rate Auction,

(ii)the aggregate amount of such Borrowing, which shall be $10,000,000 or a larger multiple of $500,000,

(iii)the duration of the Interest Period applicable thereto, subject to the provisions of the definition of Interest Period, and

(iv)whether the Money Market Quotes requested are to set forth a Money Market Margin or a Money Market Absolute Rate.

The Borrower may request offers to make Money Market Loans for more than one Interest Period in a single Money Market Quote Request. No Money Market Quote Request shall be given within thirty days (or such other number of days as the Borrower and the Administrative Agent may agree) of any other Money Market Quote Request.

(c)Invitation for Money Market Quotes. Promptly upon receipt of a Money Market Quote Request, the Administrative Agent shall send to the Banks by telex or facsimile transmission an Invitation for Money Market Quotes substantially in the form of Exhibit F hereto, which shall constitute an invitation by the Borrower to each Bank to submit Money Market Quotes offering to make the Money Market Loans to which such Money Market Quote Request relates in accordance with this Section 2.3.

(d)Submission and Contents of Money Market Quotes. (i) Each Bank may submit a Money Market Quote containing an offer or offers to make Money Market Loans in response to any Invitation for Money Market Quote Request. Each Money Market Quote must comply with the requirements of this subsection (d) and must be submitted to the Administrative Agent by telex or facsimile transmission at its offices specified in or pursuant to Section 9.1 not later than (x) 10:00 a.m. (New York City time) on the third Euro-Dollar Business Day prior to the proposed date of Borrowing, in the case of a LIBOR Auction, or (y) 10:00 a.m. (New York City time) on the proposed date of Borrowing, in the case of an Absolute Rate Auction (or, in either case, such other time or date as the Borrower and the Administrative Agent shall have mutually agreed and shall have notified to the Banks not later than the date of the Money Market Quote Request for the first LIBOR Auction or Absolute Rate Auction for which such change is to be effective); provided that Money Market Quotes submitted by the Administrative Agent (or any Affiliate of the Administrative Agent) in the capacity of a Bank may be submitted, and may only be submitted, if the Administrative Agent or such Affiliate notifies the Borrower of the terms of the offer or offers contained therein not later than thirty (30) minutes prior to the applicable deadline for the other Banks. Subject to Articles III and VI, any Money Market Quote so made shall be irrevocable except with the written consent of the Administrative Agent given on the instructions of the Borrower. Such Money Market Loans may be funded by such Bank's Designated Lender (if any) as provided in Section 9.6(d); however such Bank shall not be required to specify in its Money Market Quote whether such Money Market Loans will be funded by such Designated Lender.

(i)Each Money Market Quote shall be in substantially the form of Exhibit G hereto and shall in any case specify:

(1)the proposed date of Borrowing,

(2)the principal amount of the Money Market Loan for which each such offer is being made, which principal amount (w) may be greater than or less than the Commitment of the quoting Bank, (x) must be $10,000,000 or a larger multiple of $500,000, (y) may not exceed the principal amount of Money Market Loans for which offers were requested and (z) may be subject to an aggregate limitation as to the

principal amount of Money Market Loans for which offers being made by such quoting Bank may be accepted,

(3)in the case of a LIBOR Auction, the margin above or below the applicable London Interbank Offered Rate (the “Money Market Margin”) offered for each such Money Market Loan, expressed as a percentage (specified to the nearest 1/10,000th of 1%) to be added to or subtracted from such base rate,

(4)in the case of an Absolute Rate Auction, the rate of interest per annum (specified to the nearest 1/10,000th of 1%) (the “Money Market Absolute Rate”) offered for each such Money Market Loan, and

(5)the identity of the quoting Bank.

A Money Market Quote may set forth up to five separate offers by the quoting Bank with respect to each Interest Period specified in the related Money Market Quote Request.

(ii)Any Money Market Quote shall be disregarded if it:

(1)is not substantially in conformity with Exhibit G hereto or does not specify all of the information required by subsection (d)(ii) above;

(2)contains qualifying, conditional or similar language;

(3)proposes terms other than or in addition to those set forth in the applicable Invitation for Money Market Quotes; or

(4)arrives after the time set forth in subsection (d)(i).

(e)Notice to Borrower. The Administrative Agent shall promptly notify the Borrower (x) with respect to each Money Market Quote submitted in accordance with subsection (d), of the terms of such Money Market Quote and the identity of the Bank submitting such Money Market Quote and (y) of any Money Market Quote that amends, modifies or is otherwise inconsistent with a previous Money Market Quote submitted by such Bank with respect to the same Money Market Quote Request. Any such subsequent Money Market Quote shall be disregarded by the Administrative Agent unless such subsequent Money Market Quote is submitted solely to correct a manifest error in such former Money Market Quote. The Administrative Agent's notice to the Borrower shall specify (A) the aggregate principal amount of Money Market Loans for which offers have been received for each Interest Period specified in the related Money Market Quote Request, (B) the respective principal amounts and Money Market Margins or Money Market Absolute Rates, as the case may be, so offered and (C) if applicable, limitations on the aggregate principal amount of Money Market Loans for which offers in any single Money Market Quote may be accepted.

(f)Acceptance and Notice by Borrower. Not later than 1:00 p.m. (New York City time) on (x) the third Euro-Dollar Business Day prior to the proposed date of Borrowing, in the case of a LIBOR Auction, or (y) the proposed date of Borrowing, in the case of an Absolute Rate Auction (or, in either case, such other time or date as the Borrower and the Administrative Agent shall have mutually agreed and shall have notified to the Banks not later than the date of the Money Market Quote Request for the first LIBOR Auction or Absolute Rate Auction for which such change is to be effective), the Borrower shall notify the Administrative Agent of its acceptance or non-acceptance of the offers so notified to it pursuant to subsection (e). In the case of acceptance, such notice (a “Notice of Money Market Borrowing”) shall specify the aggregate principal amount of offers for each Interest Period that are accepted. The Borrower may accept any Money Market Quote in whole or in part; provided that:

(i)the aggregate principal amount of each Money Market Borrowing may not exceed the applicable amount set forth in the related Money Market Quote Request;

(ii)the principal amount of each Money Market Borrowing must be $10,000,000 or a larger multiple of $500,000;

(iii)acceptance of offers may only be made on the basis of ascending Money Market Margins or Money Market Absolute Rates, as the case may be; and

(iv)the Borrower may not accept any offer that is described in subsection (d)(iii) or that otherwise fails to comply with the requirements of this Agreement.

(g)Allocation by Administrative Agent. If offers are made by two or more Banks with the same Money Market Margins or Money Market Absolute Rates, as the case may be, for a greater aggregate principal amount than the amount in respect of which such offers are accepted for the related Interest Period, the principal amount of Money Market Loans in respect of which such offers are accepted shall be allocated by the Administrative Agent among such Banks as nearly as possible (in multiples of $500,000, as the Administrative Agent may deem appropriate) in proportion to the aggregate principal amounts of such offers. Determinations by the Administrative Agent of the amounts of Money Market Loans shall be conclusive in the absence of manifest error.

(h)Notification by Administrative Agent. Upon receipt of the Borrower's Notice of Money Market Borrowing in accordance with Section 2.3(f) hereof, the Administrative Agent shall, on the date such Notice of Money Market Borrowing is received by the Administrative Agent, notify each Bank of the principal amount of the Money Market Borrowing accepted by the Borrower and of such Bank's share (if any) of such Money Market Borrowing and such Notice of Money Market Borrowing shall not thereafter be revocable by the Borrower. A Bank who is notified that it has been selected to make a

Money Market Loan may designate its Designated Lender (if any) to fund such Money Market Loan on its behalf, as described in Section 9.6(d). Any Designated Lender which funds a Money Market Loan shall on and after the time of such funding become the obligee under such Money Market Loan and be entitled to receive payment thereof when due. No Bank shall be relieved of its obligation to fund a Money Market Loan, and no Designated Lender shall assume such obligation, prior to the time the applicable Money Market Loan is funded.

Section 8.Notice to Banks; Funding of Loans.

(a)Upon receipt of a Notice of Committed Borrowing, the Administrative Agent shall notify each Bank on the same day as it receives the Notice of Committed Borrowing of the contents thereof and of such Bank's share of such Borrowing and such Notice of Committed Borrowing shall not thereafter be revocable by the Borrower.

(b)Not later than 2:00 P.M. (New York City time) on the date of each Committed Borrowing, each Bank shall make available its share of such Committed Borrowing, in Federal or other funds immediately available in New York City, to the Administrative Agent at its address referred to in Section 9.1. The Administrative Agent will make the funds so received from the Banks available to the Borrower at the Administrative Agent's aforesaid address. If the Borrower has requested the issuance of a Letter of Credit, no later than 12:00 Noon (New York City time) on the date of such issuance as indicated in the notice delivered pursuant to Section 2.2(b), the Fronting Bank shall issue such Letter of Credit in the amount so requested and deliver the same to the Borrower with a copy thereof to the Administrative Agent. At the request of any Bank, the Administrative Agent promptly shall deliver copies thereof to such Bank. Immediately upon the issuance of each Letter of Credit by the Fronting Bank, such Fronting Bank shall be deemed to have sold and transferred to each other Bank, and each such other Bank shall be deemed, and hereby agrees, to have irrevocably and unconditionally purchased and received from the Fronting Bank, without recourse or warranty, an undivided interest and a participation in such Letter of Credit, any drawing thereunder, and the obligations of the Borrower hereunder with respect thereto, and any security therefor or guaranty pertaining thereto, in an amount equal to such Bank's ratable share thereof (based upon the ratio its Commitment bears to the aggregate of all Commitments). Upon any change in any of the Commitments in accordance herewith, there shall be an automatic adjustment to such participations to reflect such changed shares. The Fronting Bank shall have the primary obligation to fund any and all draws made with respect to such Letter of Credit notwithstanding any failure of a participating Bank to fund its ratable share of any such draw. Unless the Administrative Agent determines that any applicable condition specified in Article III has not been satisfied, the Administrative Agent will instruct the Fronting Bank to make such Letter of Credit available to the Borrower and the Fronting Bank shall make such Letter of Credit available to the Borrower at the Borrower's aforesaid address or at such address in the United States as Borrower shall request on the date of the Borrowing.

(c)Not later than 3:00 p.m. (New York City time) on the date of each Swingline Borrowing as indicated in the applicable Notice of Borrowing, the Swingline Lender shall make available such Swingline Borrowing in Federal funds immediately available in New York, New York to the Administrative Agent at its address referred to in Section 9.1.

(d)Unless the Administrative Agent shall have received notice from a Bank prior to the date of any Borrowing that such Bank will not make available to the Administrative Agent such Bank's share of such Borrowing, the Administrative Agent may assume that such Bank has made such share available to the Administrative Agent on the date of such Borrowing in accordance with subsection (b) of this Section 2.4 and the Administrative Agent may, in reliance upon such assumption, make available to the Borrower on such date a corresponding amount. If and to the extent that such Bank shall not have so made such share available to the Administrative Agent, such Bank and the Borrower severally agree to repay to the Administrative Agent forthwith on demand such corresponding amount together with interest thereon, for each day from the date such amount is made available to the Borrower until the date such amount is repaid to the Administrative Agent, at (i) in the case of the Borrower, a rate per annum equal to the higher of the Federal Funds Rate and the interest rate applicable thereto pursuant to Section 2.7 and (ii) in the case of such Bank, the Federal Funds Rate. If such Bank shall repay to the Administrative Agent such corresponding amount, such amount so repaid shall constitute such Bank's Loan included in such Borrowing for purposes of this Agreement.

Section 9.Notes.

(a)At the request of any Bank, its Loans shall be evidenced by the Notes, each of which shall be payable to each applicable Bank for the account of its Applicable Lending Office in an amount equal to each such Bank's Commitment.

(b)Each Bank may, by notice to the Borrower and the Administrative Agent, request that its Loans of a particular type be evidenced by a separate Note in an amount equal to the aggregate unpaid principal amount of such Bank's Loans of such type. Each such Note shall be in substantially the form of Exhibit A hereto, with appropriate modifications to reflect the fact that it evidences solely Loans of the relevant type for such Bank. Each reference in this Agreement to the “Note” of such Bank shall be deemed to refer to and include any or all of such Notes, as the context may require.

(c)Upon receipt of each Bank's Note, the Administrative Agent shall forward such Note to such Bank. Each Bank shall record the date, amount, type and maturity of each Loan made by it and the date and amount of each payment of principal made by the Borrower with respect thereto, and may, if such Bank so elects in connection with any transfer or enforcement of its Note, endorse on the schedule forming a part thereof appropriate notations to evidence the foregoing information with respect to each such Loan then outstanding; provided that the failure of any Bank to make any such recordation or endorsement shall not affect the obligations of the Borrower hereunder or under the Notes. Each Bank is hereby

irrevocably authorized by the Borrower so to endorse its Note and to attach to and make a part of its Note a continuation of any such schedule as and when required.

(d)There shall be no more than ten (10) Euro-Dollar Borrowings outstanding at any one time pursuant to this Agreement.

Section 10.Maturity of Loans. The Loans, except as otherwise provided herein with respect to Swingline Loans or as otherwise provided in Section 6.2, shall mature, and the principal amount thereof shall be due and payable, on the Maturity Date. Swingline Loans shall mature, and the principal amount thereof shall be due and payable, in accordance with Section 2.18(b)(iii).

Section 11.Interest Rates.

(a)Each Base Rate Loan shall bear interest on the outstanding principal amount thereof, for each day from the date such Loan is made until it becomes due, at a rate per annum equal to the sum of the Applicable Margin for Base Rate Loans plus the Base Rate for such day. Such interest shall be payable in arrears for each Interest Period on the last day thereof.

(b)Each Euro-Dollar Loan shall bear interest on the outstanding principal amount thereof, for each day during the Interest Period applicable thereto, at a rate per annum equal to the sum of the Applicable Margin for Euro-Dollar Loans plus the Adjusted London Interbank Offered Rate for such day. Such interest shall be payable in arrears for each Interest Period on the last day thereof and, if such Interest Period is longer than three months, at intervals of three months after the first day thereof.

“Adjusted London Interbank Offered Rate” applicable to any Interest Period means a rate per annum equal to the quotient obtained (rounded upward, if necessary, to the next higher 1/100 of 1%) by dividing (i) the applicable London Interbank Offered Rate by (ii) 1.00 minus the Euro-Dollar Reserve Percentage.

“Euro-Dollar Reserve Percentage” means for any day that percentage (expressed as a decimal) which is in effect on such day, as prescribed by the Board of Governors of the Federal Reserve System (or any successor) for determining the maximum reserve requirement for a member bank of the Federal Reserve System in New York City with deposits exceeding five billion dollars in respect of “Eurocurrency liabilities” (or in respect of any other category of liabilities which includes deposits by reference to which the interest rate on Euro-Dollar Loans is determined or any category of extensions of credit or other assets which includes loans by a non-United States office of any Bank to United States residents). The Adjusted London Interbank Offered Rate shall be adjusted automatically on and as of the effective date of any change in the Euro-Dollar Reserve Percentage.

The “London Interbank Offered Rate” applicable to a particular Interest Period shall mean a rate per annum equal to the British Bankers Association LIBOR Rate, or the successor thereto if the British Bankers Association is no longer making the LIBOR Rate available (“BBA LIBOR”), as published by Reuters (or other commercially available source providing quotations of BBA LIBOR as designated by the Administrative Agent from time to time) for Dollar deposits with maturities comparable to such Interest Period as of 11:00 a.m., London time, on the Quotation Date; provided, however, if such rate is not available at such time for any reason, the “London Interbank Offered Rate” applicable to a particular Interest Period shall mean a rate per annum equal to the rate at which Dollar deposits in an amount approximately equal to the applicable Euro-Dollar Loan(s), and with maturities comparable to the last day of the Interest Period with respect to which such London Interbank Offered Rate is applicable, are offered in immediately available funds in the London Interbank Market to the London office of the Administrative Agent by leading banks in the Eurodollar market at 11:00 a.m., London time on the Quotation Date.

The “Quotation Date” means, in relation to any period for which an interest rate is to be determined, two (2) Euro-Dollar Business Days before the first day of that period, unless market practice differs in the relevant interbank market for a currency, in which case the Quotation Date for that currency will be determined by the Administrative Agent in accordance with market practice in the London interbank market (and if quotations would normally be given by leading banks in the London interbank market on more than one day, the Quotation Date will be the last of those days).

(c)Subject to Section 8.1, each Money Market LIBOR Loan shall bear interest on the outstanding principal amount thereof, for the Interest Period applicable thereto, at a rate per annum equal to the sum of the London Interbank Offered Rate for such Interest Period (determined in accordance with Section 2.7(b) as if the related Money Market LIBOR Borrowing were a Committed Euro-Dollar Borrowing) plus (or minus) the Money Market Margin quoted by the Bank making such Loan in accordance with Section 2.3. Each Money Market Absolute Rate Loan shall bear interest on the outstanding principal amount thereof, for the Interest Period applicable thereto, at a rate per annum equal to the Money Market Absolute Rate quoted by the Bank making such Loan in accordance with Section 2.3. Such interest shall be payable for each Interest Period on the last day thereof and, if such Interest Period is longer than 3 months, at intervals of 3 months after the first day thereof.

(d)Interest on all Loans bearing interest at the Offered Rate shall be payable for each applicable Interest Period on the last day thereof.

(e)In the event that, and for so long as, any Event of Default shall have occurred and be continuing, the outstanding principal amount of the Loans, and, to the extent permitted by law, overdue interest in respect of all Loans, shall bear interest at the annual rate of the sum of the Base Rate and two percent (2%).

(f)The Administrative Agent shall determine each interest rate applicable to the Loans hereunder. The Administrative Agent shall give prompt notice to the Borrower and the Banks of each rate of interest so determined, and its determination thereof shall be conclusive in the absence of manifest error.

(g)The Reference Bank agrees to use its best efforts to furnish quotations to the Administrative Agent as contemplated by this Section. If the Reference Bank does not furnish a timely quotation, the provisions of Section 8.1 shall apply.

Section 12.Fees.

(a)Facility Fee.

(i)During the Term, the Borrower shall pay to the Administrative Agent for the account of the Banks ratably in proportion to their respective Commitments, a facility fee on the full Loan Amount at the respective percentages per annum based upon the Borrower's Credit Rating in accordance with the following table:

Borrower's Credit Rating	Facility Fee
<BBB-/Baa3 or unrated	0.35%
BBB-/Baa3	0.3%
BBB/Baa2	0.225%
BBB+/Baal	0.175%
A-/A3 or better	0.15%

(ii)The facility fee shall be payable at all times (quarterly in arrears), irrespective of usage, on each January 1, April 1, July 1, and October 1 during the Term and any extensions thereof. Any change in the Borrower's Credit Rating causing it to move into a different range on the table shall effect an immediate change in the applicable percentage per annum. If there are only two Borrower's Credit Ratings, it will be the higher of the two. In the event that the Borrower's Credit Ratings are more than one level apart, the median rating will be used. If there are three Borrower's Credit Ratings, and such ratings are split, then, if the difference between the highest and lowest is one level apart, it will be the highest of the three, but if the difference is more than one level, the rating will be the average of the two highest (or if such average is not a recognized category, then the second highest rating will be used). If there is only one Borrower's Credit Rating, the facility fee shall be based on such rating. Should Borrower (or General Partner) lose its Investment Grade Rating from both S&P and Moody's, the facility fee will revert to the unrated portion of the table above. Upon reinstatement of such Investment Grade Rating from either S&P or Moody's, the facility fee will revert to the rated pricing table above.

(b)Letter of Credit Fee. During the Term, the Borrower shall pay to the Administrative Agent, for the account of the Banks in proportion to their interests in respect of undrawn issued Letters of Credit, a fee (a “Letter of Credit Fee”) in an amount, provided that no Event of Default shall have occurred and be continuing, equal to a rate per annum equal to the Applicable Margin with respect to Euro-Dollar Loans on the daily average of such issued and undrawn Letters of Credit, which fee shall be payable, in arrears, on each January 1, April 1, July 1 and October 1 during the Term. From the occurrence, and during the continuance, of an Event of Default, such fee shall be increased to be equal to two percent (2%) per annum on the daily average of such issued and undrawn Letters of Credit.

(c)Fronting Bank Fee. The Borrower shall pay any Fronting Bank, for its own account, a fee (a “Fronting Bank Fee”) at a rate per annum equal to 0.15% of the issued and undrawn amount of such Letter of Credit, which fee shall be in addition to and not in lieu of, the Letter of Credit Fee. The Fronting Bank Fee shall be payable in arrears on each January 1, April 1, July 1 and October 1 during the Term.

(d)Extension Fee. If the Borrower elects to extend the term of the Commitments in accordance with Section 2.9(a), the Borrower shall pay to the Administrative Agent no later than the then applicable Maturity Date (without giving effect to such extension) for the account of the Banks in proportion to their Commitments, a fee (the “Extension Fee”) for each extension in an amount equal to 0.075% of the aggregate Commitments at such time of extension.

(e)Fees Non-Refundable. All fees set forth in this Section 2.8 shall be deemed to have been earned on the date payment is due in accordance with the provisions hereof and shall be non-refundable. The obligation of the Borrower to pay such fees in accordance with the provisions hereof shall be binding upon the Borrower and shall inure to the benefit of the Administrative Agent and the Banks regardless of whether any Loans are actually made.

Section 13.Extended Maturity Date; Mandatory Termination. (a) The Borrower shall have two (2) options to extend the then applicable Maturity Date for a period of six (6) months per extension to the applicable Extended Maturity Date, which shall become effective upon the date (the “Extension Effective Date”) that the following conditions are satisfied:

(i)the Borrower shall have delivered to the Administrative Agent a written request for such extension, which request must be delivered at least thirty (30) days, and cannot be delivered more than one hundred

twenty (120) days, prior to the then applicable Maturity Date (and the Administrative Agent shall forward to each Bank a copy of such request promptly upon receipt thereof);

(ii)no Default or Event of Default shall exist on the date of such written request from the Borrower and on the then applicable Extension Effective Date; and

(iii)the Borrower shall have paid the Extension Fee payable under Section 2.8(d).

(a)Unless earlier terminated pursuant to Section 6.2, the term (the “Term”) of the Commitments shall terminate and expire, and the Borrower shall return or cause to be returned all Letters of Credit to the Fronting Bank, on the Maturity Date.

Section 14.Mandatory Prepayment. (a) In the event that an Unencumbered Asset Pool Property (or any Separate Parcel that originally formed a part of an Unencumbered Asset Pool Property) is sold, transferred or released from the restrictions of Section 5.11 hereof, the Borrower shall, simultaneously with such sale, transfer or release, prepay the Loans in an amount equal to 100% of the net proceeds of such sale or transfer, in the event of a sale or transfer, or such lesser amount as shall be required for the Borrower to remain in compliance with this Agreement, in the event of such a sale, transfer or release. Notwithstanding the foregoing, a simultaneous like-kind exchange under Section 1031 of the Internal Revenue Code will not be subject to the provisions of this Section 2.10(a), provided that the exchanged property has qualified as a New Acquisition and any cash “boot” associated therewith shall be applied to prepayment of the Loans or such lesser amount of such cash “boot” as shall be required for the Borrower to remain in compliance with this Agreement. Sale of an Unencumbered Asset Pool Property (or any Separate Parcel that originally formed a part of a Unencumbered Asset Pool Property) in violation of this Section 2.10 shall constitute an Event of Default.

(a)In the event that the Unsecured Debt Ratio is not maintained as of the last day of a calendar quarter, either (i) the Borrower will add a Real Property Asset to the Unencumbered Asset Pool Properties in accordance with this Agreement which, on a proforma basis (i.e. the Unsecured Debt Ratio shall be recalculated to include such Real Property Asset as though the same had been an Unencumbered Asset Pool Property for the entire applicable period) would result in compliance with the Unsecured Debt Ratio, or (ii) the Borrower shall prepay to the Administrative Agent, for the account of the Banks, an amount necessary to cause the Unsecured Debt Ratio to be in compliance within ninety (90) days of the date on which the Unsecured Debt Ratio failed to be maintained. Failure by the Borrower to comply with the Unsecured Debt Ratio within ninety (90) days of the date of such non-compliance shall be an Event of Default.

Section 15.Optional Prepayments.

(a)The Borrower may, upon at least one Domestic Business Day's notice to the Administrative Agent, prepay to the Administrative Agent, for the account of the Banks, any Base Rate Borrowing or Loans bearing interest at the Offered Rate in whole at any time, or from time to time in part in amounts aggregating One Million Dollars ($1,000,000), or an integral multiple of One Million Dollars ($1,000,000) in excess thereof or, if less, the outstanding principal balance, by paying the principal amount to be prepaid together with accrued interest thereon to the date of prepayment. The Borrower may, from time to time on any Domestic Business Day so long as prior notice is given to the Administrative Agent and the Swingline Lender no later than 1:00 p.m. (New York City time) on the day on which the Borrower intends to make such prepayment, prepay any Swingline Loans in whole or in part in amounts aggregating $100,000 or a higher integral multiple of $100,000 (or, if less, the aggregate outstanding principal amount of all Swingline Loans then outstanding) by paying the principal amount to be prepaid together with accrued interest thereon to the date of prepayment. Each such optional prepayment shall be applied to prepay ratably the Loans of the several Banks (or the Swingline Lender in the case of Swingline Loans) included in such Borrowing.

(b)Except as provided in Section 8.2, the Borrower may not prepay all or any portion of the principal amount of any Euro-Dollar Loan prior to the maturity thereof unless the Borrower shall also pay any applicable expenses pursuant to Section 2.13. Any such prepayment shall be upon at least one (1) Euro-Dollar Business Day's notice to the Administrative Agent, and the Administrative Agent shall notify the Banks of receipt of any such notice on the same Euro-Dollar Business Day as received by it. Any notice of prepayment delivered pursuant to this Section 2.11(b) shall set forth the amount of such prepayment which is applicable to any Loan made for working capital purposes. Each such optional prepayment shall be in the amounts set forth in Section 2.11(a) above and shall be applied to prepay ratably the Loans of the Banks included.

(c)The Borrower may not prepay any Money Market Loan.

(d)The Borrower may, upon at least one (1) Domestic Business Day's notice to the Administrative Agent (by 2:00 p.m. New York time on such Domestic Business Day), reimburse the Administrative Agent for the benefit of the Fronting Bank for the amount of any drawing under a Letter of Credit in whole or in part in any amount.

(e)The Borrower may at any time return any undrawn Letter of Credit to the Fronting Bank in whole, but not in part, and the Fronting Bank shall give the Administrative Agent and each of the Banks notice of such return.

(f)The Borrower may at any time and from time to time cancel all or any part of the Commitments in amounts aggregating One Million Dollars ($1,000,000), or an integral multiple of One Million Dollars ($1,000,000) in excess thereof, by the delivery to the Administrative Agent and the Banks of a notice of cancellation upon at least three (3) Domestic Business Days' notice to Administrative Agent and the Banks, whereupon, all or such portion of the Commitments shall

terminate as to the Banks, pro rata on the date set forth in such notice of cancellation, and, if there are any Loans then outstanding in an aggregate amount which exceeds the aggregate Commitments (after giving effect to any such reduction), the Borrower shall prepay to the Administrative Agent, for the account of the Banks, all or such portion of Loans outstanding on such date in accordance with the requirements of Sections 2.11(a) and (b). In no event shall the Borrower be permitted to cancel Commitments for which a Letter of Credit has been issued and is outstanding unless the Borrower returns (or causes to be returned) such Letter of Credit to the Fronting Bank. The Borrower shall be permitted to designate in its notice of cancellation which Loans, if any, are to be prepaid. A reduction of the Commitments pursuant to this Section 2.11(f) shall not effect a reduction in the Swingline Commitment (unless so elected by the Borrower) until the aggregate Commitments have been reduced to an amount equal to the Swingline Commitment.

(g)Upon receipt of a notice of prepayment or cancellation or a return of a Letter of Credit pursuant to this Section, the Administrative Agent shall promptly, and in any event within one (1) Domestic Business Day, notify each Bank of the contents thereof and of such Bank's ratable share (if any) of such prepayment or cancellation and such notice shall not thereafter be revocable by the Borrower.

(h)Any amounts so prepaid pursuant to this Section 2.11 may be reborrowed subject to the other terms of this Agreement. In the event that the Borrower elects to cancel all or any portion of the Commitments and the Swingline Commitment pursuant to Section 2.11(f) hereof, such cancellation shall be irrevocable and such amounts may not be reborrowed.

Section 16.General Provisions as to Payments.

(a)The Borrower shall make each payment of principal of, and interest on, the Loans and of fees hereunder, not later than 3:00 p.m. (New York City time) on the date when due, in Federal or other funds immediately available in New York City, to the Administrative Agent at its address referred to in Section 9.1. The Administrative Agent will distribute to each Bank its ratable share of each such payment received by the Administrative Agent for the account of the Banks on the same day as received by the Administrative Agent if received by the Administrative Agent by 3:00 p.m. (New York City time), or, if received by the Administrative Agent after 3:00 p.m. (New York City time), on the immediately following Domestic Business Day. If the Administrative Agent shall fail to distribute to a Bank its ratable share of a payment on the same day it is received or the immediately following Domestic Business Day, as applicable in accordance with the immediately preceding sentence, the Administrative Agent shall pay to such Bank the interest accrued on such payment at the Federal Funds Rate, commencing on the day the Administrative Agent should have made the payment to such Bank and ending on the day prior to the date payment is actually made. Whenever any payment of principal of, or interest on, the Base Rate Loans or Swingline Loans or of fees shall be due on a day which is not a Domestic Business Day, the date for payment thereof shall be extended to the next succeeding Domestic Business Day. Whenever any payment of principal of, or interest on, the Euro-Dollar Loans shall be due on a day which is not a Euro-Dollar Business Day, the date for payment thereof shall be extended to the next succeeding Euro-Dollar Business Day unless such Euro-Dollar Business Day falls in another calendar month, in which case the date for payment thereof shall be the next preceding Euro-Dollar Business Day. If the date for any payment of principal is extended by operation of law or otherwise, interest thereon shall be payable for such extended time.

(b)Unless the Administrative Agent shall have received notice from the Borrower prior to the date on which any payment is due to the Banks hereunder that the Borrower will not make such payment in full, the Administrative Agent may assume that the Borrower has made such payment in full to the Administrative Agent on such date and the Administrative Agent may, in reliance upon such assumption, cause to be distributed to each Bank on such due date an amount equal to the amount then due such Bank. If and to the extent that the Borrower shall not have so made such payment, each Bank shall repay to the Administrative Agent forthwith on demand such amount distributed to such Bank together with interest thereon, for each day from the date such amount is distributed to such Bank until the date such Bank repays such amount to the Administrative Agent, at the Federal Funds Rate.

(c)All payments made on the Loans shall be credited, to the extent of the amount thereof, in the following manner: (a) first, against all costs, expenses and other fees (including reasonable attorneys' fees) arising under the terms hereof, of which, if no Event of Default shall have occurred and be continuing, the Borrower has received notice pursuant to the terms hereof, (b) second, against the amount of interest accrued and unpaid on the Loans as of the date of such payment, (c) third, against all principal due and owing on the Loans as of the date of such payment, and (d) fourth, to all other amounts constituting any portion of the Obligations.

(d)If any Bank is a Defaulting Lender, then the Administrative Agent may (or at the request of the Borrower, shall), in its discretion and notwithstanding any contrary provision hereof, (i) apply any amounts thereafter received by the Administrative Agent for the account of such Bank for the benefit of the Administrative Agent, the Swingline Lender or the Fronting Bank to satisfy such Bank's obligations to it hereunder until such Bank is not a Defaulting Lender, and/or (ii) hold any such amounts in a segregated account as cash collateral for, and application to, any future funding obligations of such Bank hereunder, in the case of each of clauses (i) and (ii) above, in any order as determined by the Administrative Agent in its discretion.

Section 17.Funding Losses. If the Borrower makes any payment of principal with respect to any Euro-Dollar Loan (pursuant to Article II, VI or VIII or otherwise, and specifically including any payments made pursuant to Sections 2.10 or 2.11) on any day other than the last day of the Interest Period applicable thereto, or if the Borrower fails to borrow any

Euro-Dollar Loans, after notice has been given to any Bank in accordance with Section 2.4(a), or to prepay any Euro-Dollar Loans, after notice has been given to any Bank in accordance with Section 2.11(b), the Borrower shall reimburse each Bank within 15 days after demand for any resulting loss or expense incurred by it (or by an existing Participant in the related Loan; provided that no Participant shall be entitled to receive more than the Bank, with respect to which such Participant is a Participant, would be entitled to receive under this Section 2.13), including (without limitation) any loss incurred in obtaining, liquidating or employing deposits from third parties, but excluding loss of margin for the period after any such payment or failure to borrow, provided that such Bank shall have delivered to the Borrower a certificate as to the amount of such loss or expense and the calculation thereof, which certificate shall be conclusive in the absence of manifest error.

Section 18.Computation of Interest and Fees. Interest based on the Prime Rate hereunder shall be computed on the basis of a year of 365 days (or 366 days in a leap year) and paid for the actual number of days elapsed (including the first day but excluding the last day). All other interest and fees shall be computed on the basis of a year of 360 days and paid for the actual number of days elapsed (including the first day but excluding the last day).

Section 19.Method of Electing Interest Rates.

(a)The Loans included in each Borrowing shall bear interest initially at the type of rate specified by the Borrower in the applicable Notice of Committed Borrowing or as otherwise provided in Section 2.18 with respect to Mandatory Borrowings. Thereafter, the Borrower may from time to time elect to change or continue the type of interest rate borne by each Group of Loans (subject in each case to the provisions of Article VIII), as follows:

(i)if such Loans are Base Rate Loans, the Borrower may elect to convert such Loans to Euro-Dollar Loans or Loans bearing interest at the Offered Rate as of any Euro-Dollar Business Day;

(ii)if such Loans are Euro-Dollar Loans or Loans bearing interest at the Offered Rate, the Borrower may elect to convert such Loans to Base Rate Loans or elect to continue such Loans as Euro-Dollar Loans for an additional Interest Period, in each case effective on the last day of the then current Interest Period applicable to such Loans.

Each such election shall be made by delivering a notice (a “Notice of Interest Rate Election”) to the Administrative Agent at least three (3) Euro-Dollar Business Days before the conversion or continuation selected in such notice is to be effective (unless the relevant Loans are to be continued as Base Rate Loans, in which case such notice shall be delivered to the Administrative Agent no later than 2:00 p.m. (New York City time) at least one (1) Domestic Business Day before such continuation is to be effective). A Notice of Interest Rate Election may, if it so specifies, apply to only a portion of the aggregate principal amount of the relevant Group of Loans; provided that (i) such portion is allocated ratably among the Loans comprising such Group, (ii) the portion to which such notice applies, and the remaining portion to which it does not apply, are each $1,000,000 or any larger multiple of $1,000,000, (iii) there shall be no more than ten (10) Borrowings comprised of Euro-Dollar Loans outstanding at any time under this Agreement, (iv) no Loan may be continued as, or converted into, a Euro-Dollar Loan when any Event of Default has occurred and is continuing, and (v) no Interest Period shall extend beyond the Maturity Date.

(b)Each Notice of Interest Rate Election shall specify:

(i)the Group of Loans (or portion thereof) to which such notice applies;

(ii)the date on which the conversion or continuation selected in such notice is to be effective, which shall comply with the applicable clause of subsection (a) above;

(iii)if the Loans comprising such Group are to be converted, the new type of Loans and, if such new Loans are Euro-Dollar Loans, the duration of the initial Interest Period applicable thereto; and

(iv)if such Loans are to be continued as Euro-Dollar Loans for an additional Interest Period, the duration of such additional Interest Period.

Each Interest Period specified in a Notice of Interest Rate Election shall comply with the provisions of the definition of Interest Period.

(c)Upon receipt of a Notice of Interest Rate Election from the Borrower pursuant to subsection (a) above, the Administrative Agent shall notify each Bank on the same day as it receives such Notice of Interest Rate Election of the contents thereof and such notice shall not thereafter be revocable by the Borrower. If the Borrower fails to deliver a timely Notice of Interest Rate Election to the Administrative Agent for any Group of Euro-Dollar Loans, such Loans shall be converted into Base Rate Loans on the last day of the then current Interest Period applicable thereto.

Section 20.Letters of Credit. (a) Subject to the terms contained in this Agreement and the other Loan Documents, including Section 2.1 hereof, upon the receipt of a notice in accordance with Section 2.2(b) requesting the issuance of a Letter of Credit, the Fronting Bank shall issue a Letter of Credit or Letters of Credit in such form as is reasonably acceptable to the Borrower in an amount or amounts equal to the amount or amounts requested by the Borrower.

(a)Each Letter of Credit shall be issued in the minimum amount of Five Hundred Thousand Dollars ($500,000).

(b)The Letter of Credit Usage shall be no more than Fifty Million Dollars ($50,000,000) at any one time.

(c)[Reserved].

(d)In the event of any request for a drawing under any Letter of Credit by the beneficiary thereunder, the Fronting Bank shall endeavor to notify the Borrower and the Administrative Agent (and the Administrative Agent shall endeavor to notify each Bank thereof) on or before the date on which the Fronting Bank intends to honor such drawing, and, except as provided in this subsection (e), the Borrower shall reimburse the Fronting Bank, in immediately available funds, on the same day on which such drawing is honored in an amount equal to the amount of such drawing. Notwithstanding anything contained herein to the contrary, however, unless the Borrower shall have notified the Administrative Agent and the Fronting Bank prior to 2:00 p.m. (New York time) on the Domestic Business Day immediately prior to the date of such drawing that the Borrower intends to reimburse the Fronting Bank for the amount of such drawing with funds other than the proceeds of the Loans, the Borrower shall be deemed to have timely given a Notice of Committed Borrowing pursuant to Section 2.2 to the Administrative Agent, requesting a Borrowing of Base Rate Loans on the date on which such drawing is honored and in an amount equal to the amount of such drawing. Each Bank (other than the Fronting Bank) shall, in accordance with Section 2.4(b), make available its share of such Borrowing to the Administrative Agent, the proceeds of which shall be applied directly by the Administrative Agent to reimburse the Fronting Bank for the amount of such draw. In the event that any such Bank fails to make available to the Fronting Bank the amount of such Bank's participation on the date of a drawing, the Fronting Bank shall be entitled to recover such amount on demand from such Bank together with interest at the Federal Funds Rate commencing on the date such drawing is honored.

(e)If, at the time a beneficiary under any Letter of Credit requests a drawing thereunder, an Event of Default as described in Section 6.1(f) or Section 6.1(g) shall have occurred and is continuing, then on the date on which the Fronting Bank shall have honored such drawing, the Borrower shall have an unreimbursed obligation (the “Unreimbursed Obligation”) to the Fronting Bank in an amount equal to the amount of such drawing, which amount shall bear interest at the annual rate of the sum of the Base Rate plus two percent (2%). Each Bank shall purchase an undivided participating interest in the Unreimbursed Obligation in an amount equal to its Commitment Percentage thereof, and upon receipt thereof the Fronting Bank shall deliver to such Bank an Unreimbursed Obligation participation certificate dated the date of the Fronting Bank's receipt of such funds and in the amount of such Bank's Commitment Percentage thereof.

(f)If, after the date hereof, any change in any law or regulation or in the interpretation thereof by any court or administrative or governmental authority charged with the administration thereof shall either (i) impose, modify or deem applicable any reserve, special deposit or similar requirement against letters of credit issued by, or assets held by, or deposits in or for the account of, or participations in any letter of credit, upon any Bank (including the Fronting Bank) or (ii) impose on any Bank any other condition regarding this Agreement or such Bank (including the Fronting Bank) as it pertains to the Letters of Credit or any participation therein and the result of any event referred to in the preceding clause (i) or (ii) shall be to increase, by an amount deemed by the Fronting Bank or such Bank to be material, the cost to the Fronting Bank or any Bank of issuing or maintaining any Letter of Credit or participating therein then the Borrower shall pay to the Fronting Bank or such Bank, within 15 days after written demand by such Bank (with a copy to the Administrative Agent), which demand shall be accompanied by a certificate showing, in reasonable detail, the calculation of such amount or amounts, such additional amounts as shall be required to compensate the Fronting Bank or such Bank for such increased costs or reduction in amounts received or receivable hereunder.

(g)The Borrower hereby agrees to protect, indemnify, pay and save the Fronting Bank harmless from and against any and all claims, demands, liabilities, damages, losses, costs, charges and expenses (including reasonable attorneys' fees and disbursements) which the Fronting Bank may incur or be subject to as a result of (i) the issuance of the Letters of Credit, other than as a result of the gross negligence or willful misconduct of the Fronting Bank or (ii) the failure of the Fronting Bank to honor a drawing under any Letter of Credit as a result of any act or omission, whether rightful or wrongful, of any present or future de jure or de facto government or Governmental Authority (collectively, “Governmental Acts”), other than as a result of the gross negligence or willful misconduct of the Fronting Bank. As between the Borrower and the Fronting Bank, the Borrower assumes all risks of the acts and omissions of, or misuses of, the Letters of Credit issued by the Fronting Bank, by the beneficiaries of such Letters of Credit. In furtherance and not in limitation of the foregoing, the Fronting Bank shall not be responsible (i) for the form, validity, sufficiency, accuracy, genuineness or legal effect of any document submitted by any party in connection with the application for and issuance of such Letters of Credit, even if it should in fact prove to be in any or all respects invalid, insufficient, inaccurate, fraudulent or forged; (ii) for the validity or insufficiency of any instrument transferring or assigning or purporting to transfer or assign any such Letter of Credit or the rights or benefits thereunder or proceeds thereof, in whole or in part, which may prove to be invalid or ineffective for any reason; (iii) for failure of the beneficiary of any such Letter of Credit to comply fully with conditions required in order to draw upon such Letter of Credit; (iv) for errors, omissions, interruptions or delays in transmission or delivery of any message, by mail, cable, telegraph, telex, facsimile transmission, or otherwise; (v) for errors in interpretation of any technical terms; (vi) for any loss or delay in the transmission or otherwise of any documents required in order to make a drawing under any such Letter of Credit or of the proceeds thereof; (vii) for the misapplication by the beneficiary of any such Letter of Credit of the proceeds of such Letter of Credit; and (viii) for any consequence arising from causes beyond the control of the Fronting Bank, including any Government Acts, in each case other than as a result of the gross negligence or willful misconduct of the Fronting Bank. None of the above shall affect, impair or prevent the vesting of the Fronting Bank's rights and powers hereunder. In furtherance

and extension and not in limitation of the specific provisions hereinabove set forth, any action taken or omitted by the Fronting Bank under or in connection with the Letters of Credit issued by it or the related certificates, if taken or omitted in good faith, shall not put the Fronting Bank under any resulting liability to the Borrower.

(h)If the Fronting Bank or the Administrative Agent is required at any time, pursuant to any bankruptcy, insolvency, liquidation or reorganization law or otherwise, to return to the Borrower any reimbursement by the Borrower of any drawing under any Letter of Credit, each Bank shall pay to the Fronting Bank or the Administrative Agent, as the case may be, its share of such payment, but without interest thereon unless the Fronting Bank or the Administrative Agent is required to pay interest on such amounts to the person recovering such payment, in which case with interest thereon, computed at the same rate, and on the same basis, as the interest that the Fronting Bank or the Administrative Agent is required to pay.

Section 21.Letter of Credit Usage Absolute. The obligations of the Borrower under this Agreement in respect of any Letter of Credit shall be unconditional and irrevocable, and shall be paid strictly in accordance with the terms of this Agreement (as the same may be amended from time to time) and any Letter of Credit Documents (as hereinafter defined) under all circumstances, including, without limitation, to the extent permitted by law, the following circumstances:

(a)any lack of validity or enforceability of any Letter of Credit or any other agreement or instrument relating thereto (collectively, the “Letter of Credit Documents”) or any Loan Document;

(b)any change in the time, manner or place of payment of, or in any other term of, all or any of the obligations of the Borrower in respect of the Letters of Credit or any other amendment or waiver of or any consent by the Borrower to departure from all or any of the Letter of Credit Documents or any Loan Document; provided, that the Fronting Bank shall not consent to any such change or amendment unless previously consented to in writing by the Borrower;

(c)any exchange, release or non-perfection of any collateral, or any release or amendment or waiver of or consent to departure from any guaranty, for all or any of the obligations of the Borrower in respect of the Letters of Credit;

(d)the existence of any claim, set-off, defense or other right that the Borrower may have at any time against any beneficiary or any transferee of a Letter of Credit (or any Persons for whom any such beneficiary or any such transferee may be acting), the Administrative Agent, the Fronting Bank or any Bank (other than a defense based on the gross negligence or willful misconduct of the Administrative Agent, the Fronting Bank or such Bank) or any other Person, whether in connection with the Loan Documents, the transactions contemplated hereby or by the Letters of Credit Documents or any unrelated transaction;

(e)any draft or any other document presented under or in connection with any Letter of Credit or other Loan Document proving to be forged, fraudulent, invalid or insufficient in any respect or any statement therein being untrue or inaccurate in any respect; provided, that payment by the Fronting Bank under such Letter of Credit against presentation of such draft or document shall not have constituted gross negligence or willful misconduct of the Fronting Bank;

(f)payment by the Fronting Bank against presentation of a draft or certificate that does not comply with the terms of the Letter of Credit; provided, that such payment shall not have constituted gross negligence or willful misconduct of the Fronting Bank; and

(g)any other circumstance or happening whatsoever other than the payment in full of all obligations hereunder in respect of any Letter of Credit or any agreement or instrument relating to any Letter of Credit, whether or not similar to any of the foregoing, that might otherwise constitute a defense available to, or a discharge of, the Borrower; provided, that such other circumstance or happening shall not have been the result of gross negligence or willful misconduct of the Fronting Bank.

Section 22.Swingline Loan Subfacility.

(a)Swingline Commitment. Subject to the terms and conditions of this Section 2.18, the Swingline Lender, in its individual capacity, agrees to make certain revolving credit loans to the Borrower (each a “Swingline Loan” and, collectively, the “Swingline Loans”) from time to time during the Term hereof; provided, however, that the aggregate amount of Swingline Loans outstanding at any time shall not exceed the lesser of (i) the aggregate Commitments less the Outstanding Balance, and (ii) 15% of the aggregate Commitments (the “Swingline Commitment”). Subject to the limitations set forth herein, any amounts repaid in respect of Swingline Loans may be reborrowed.

(b)Swingline Borrowings.

(i)Notice of Borrowing. With respect to any Swingline Borrowing, the Borrower shall give the Swingline Lender and the Administrative Agent notice in writing which is received by the Swingline Lender and Administrative Agent not later than 2:00 p.m. (New York City time) on the proposed date of such Swingline Borrowing (and confirmed by telephone by such time), specifying (A) that a Swingline Borrowing is being requested, (B) the amount of such Swingline Borrowing, (C) the proposed date of such Swingline Borrowing, which shall be a Domestic Business Day, and (D) that no Default or Event of Default has occurred and is continuing both before and after giving effect to such Swingline Borrowing. Such notice shall be irrevocable.

(ii)Minimum Amounts. Each Swingline Borrowing shall be in a minimum principal amount of $1,000,000, or larger multiples of $1,000,000 in excess thereof.

(iii)Repayment of Swingline Loans. Each Swingline Loan shall be due and payable on the earliest of (A) ten (10) days after the date of the applicable Swingline Borrowing, (B) the date of the next Committed Borrowing, and (C) the Maturity Date. If, and to the extent, any Swingline Loans shall be outstanding on the date of

any Committed Borrowing, such Swingline Loans shall first be repaid from the proceeds of such Committed Borrowing prior to the disbursement of the same to the Borrower. If, and to the extent, a Committed Borrowing is not requested prior to the Maturity Date or the end of the five (5) day period after a Swingline Borrowing, or unless the Borrower shall have notified the Administrative Agent and the Swingline Lender prior to 1:00 P.M. (New York City time) on the fourth (4th) day after the Swingline Borrowing that the Borrower intends to reimburse the Swingline Lender for the amount of such Swingline Borrowing with funds other than proceeds of the Loans, the Borrower shall be deemed to have requested a Committed Borrowing comprised entirely of Base Rate Loans in the amount of the applicable Swingline Loan then outstanding, the proceeds of which shall be used to repay such Swingline Loan to the Swingline Lender. In addition, if (x) the Borrower does not repay the Swingline Loan on or prior to the end of such five (5) day period, or (y) a Default or Event of Default shall have occurred during such five (5) day period, the Swingline Lender may, at any time, in its sole discretion, by written notice to the Borrower and the Administrative Agent, demand repayment of its Swingline Loans by way of a Committed Borrowing, in which case the Borrower shall be deemed to have requested a Committed Borrowing comprised entirely of Base Rate Loans in the amount of such Swingline Loans then outstanding, the proceeds of which shall be used to repay such Swingline Loans to the Swingline Lender. Any Committed Borrowing which is deemed requested by the Borrower in accordance with this Section 2.18(b)(iii) is hereinafter referred to as a “Mandatory Borrowing”. Each Bank hereby irrevocably agrees to make Committed Loans promptly upon receipt of notice from the Swingline Lender of any such deemed request for a Mandatory Borrowing in the amount and in the manner specified in the preceding sentences and on the date such notice is received by such Bank (or the next Domestic Business Day if such notice is received after 12:00 noon (New York City time)) notwithstanding (I) that the amount of the Mandatory Borrowing may not comply with the minimum amount of Committed Borrowings otherwise required hereunder, (II) whether any conditions specified in Section 3.2 are then satisfied, (III) whether a Default or an Event of Default then exists, (IV) failure of any such deemed request for a Committed Borrowing to be made by the time otherwise required in Section 2.2, (V) the date of such Mandatory Borrowing (provided that such date must be a Domestic Business Day), or (VI) any termination of the Commitments immediately prior to such Mandatory Borrowing or contemporaneously therewith; provided, however, that no Bank shall be obligated to make Committed Loans in respect of a Mandatory Borrowing if a Default or an Event of Default then exists and the applicable Swingline Loan was made by the Swingline Lender without receipt of a written Notice of Borrowing in the form specified in subclause (i) above or after Administrative Agent has delivered a notice of Default or Event of Default which has not been rescinded.

(iv)Purchase of Participations. In the event that any Mandatory Borrowing cannot for any reason be made on the date otherwise required above (including, without limitation, as a result of the commencement of a proceeding under the Bankruptcy Code with respect to the Borrower), then each Bank hereby agrees that it shall forthwith purchase (as of the date the Mandatory Borrowing would otherwise have occurred, but adjusted for any payment received from the Borrower on or after such date and prior to such purchase) from the Swingline Lender such participations in the outstanding Swingline Loans as shall be necessary to cause each such Bank to share in such Swingline Loans ratably based upon its Commitment Percentage (determined before giving effect to any termination of the Commitments pursuant to Section 6.2), provided that (A) all interest payable on the Swingline Loans with respect to any participation shall be for the account of the Swingline Lender until but excluding the day upon which the Mandatory Borrowing would otherwise have occurred, and (B) in the event of a delay between the day upon which the Mandatory Borrowing would otherwise have occurred and the time any purchase of a participation pursuant to this sentence is actually made, the purchasing Bank shall be required to pay to the Swingline Lender interest on the principal amount of such participation for each day from and including the day upon which the Mandatory Borrowing would otherwise have occurred to but excluding the date of payment for such participation, at the rate equal to the Federal Funds Rate, for the two (2) Domestic Business Days after the date the Mandatory Borrowing would otherwise have occurred, and thereafter at a rate equal to the Base Rate. Notwithstanding the foregoing, no Bank shall be obligated to purchase a participation in any Swingline Loan if a Default or an Event of Default then exists and such Swingline Loan was made by the Swingline Lender without receipt of a written Notice of Borrowing in the form specified in subclause (i) above or after Administrative Agent has delivered a notice of Default or Event of Default which has not been rescinded.

(c)Interest Rate. Each Swingline Loan shall bear interest on the outstanding principal amount thereof, for each day from the date such Swingline Loan is made until the date it is repaid, at a rate per annum equal to the Federal Funds Rate plus the Applicable Margin for Euro-Dollar Loans for such day.

CONDITIONS

Section 23.Closing. The closing hereunder shall occur on the date (the “Closing Date”) when each of the following conditions is satisfied (or waived by the Administrative Agent and the Required Banks, such waiver to be evidenced by the continuation or funding after the date hereof of Loans and notice of such waiver to be given to the Banks by the Administrative Agent), each document to be dated the Closing Date unless otherwise indicated:

(a)the Borrower shall have executed and delivered to the Administrative Agent a Note for the account of each Bank that shall have requested the same, dated on or before the Closing Date complying with the provisions of Section 2.5;

(b)the Borrower shall have executed and delivered to the Administrative Agent a duly executed original of this Agreement;

(c)the General Partner shall have executed and delivered to the Administrative Agent a duly executed original of the Guaranty;

(d)the Administrative Agent shall have received an opinion of Latham & Watkins LLP, counsel for the Borrower and the General Partner, reasonably acceptable to the Administrative Agent, the Banks and their counsel;

(e)the Administrative Agent shall have received all documents the Administrative Agent may reasonably request relating to the existence of the Borrower, the General Partner, the authority for and the validity of this Agreement and the other Loan Documents, and any other matters relevant hereto, all in form and substance reasonably satisfactory to the Administrative Agent. Such documentation shall include, without limitation, the articles of incorporation and by-laws or the partnership agreement and limited partnership certificate, as applicable, of the Borrower and the General Partner, as amended, modified or supplemented to the Closing Date, each certified to be true, correct and complete by a senior officer of the Borrower or the General Partner, as the case may be, as of the Closing Date, together with a good standing certificate from the Secretary of State (or the equivalent thereof) of the State of Delaware with respect to the Borrower and of the State of Maryland with respect to the General Partner, and a good standing certificate from the Secretary of State (or the equivalent thereof) of each other State in which the Borrower and the General Partner is required to be qualified to transact business, each to be dated not more than forty-five (45) days prior to the Closing Date;

(f)the Administrative Agent shall have received all certificates, agreements and other documents and papers referred to in this Section 3.1 and Section 3.2, unless otherwise specified, in sufficient counterparts, reasonably satisfactory in form and substance to the Administrative Agent in its sole discretion;

(g)the Borrower and the General Partner shall have taken all actions required to authorize the execution and delivery of this Agreement and the other Loan Documents and the performance thereof by the Borrower and the General Partner;

(h)the Administrative Agent and the Banks shall have received an unaudited consolidated balance sheet and income statement of the Borrower for the fiscal quarter ended September 30, 2012;

(i)the Administrative Agent shall be satisfied that neither the Borrower nor the General Partner is subject to any present or contingent environmental liability which could reasonably be expected to have a Material Adverse Effect;

(j)the Administrative Agent shall have received wire transfer instructions in connection with the Loans to be made on the Closing Date;

(k)the Administrative Agent shall have received, for its and any other Bank's account, all fees due and payable pursuant to Section 2.8 hereof on or before the Closing Date, and the reasonable fees and expenses accrued through the Closing Date of Bingham McCutchen LLP;

(l)the Administrative Agent shall have received copies of all consents, licenses and approvals, if any, required in connection with the execution, delivery and performance by the Borrower, and the validity and enforceability against the Borrower, of the Loan Documents, or in connection with any of the transactions contemplated thereby to occur on or prior to the Closing Date, and such consents, licenses and approvals shall be in full force and effect;

(m)the representations and warranties of the Borrower contained in this Agreement shall be true and correct in all material respects on and as of the Closing Date both before and after giving effect to the making of any Loans;

(n)receipt by the Administrative Agent and the Banks of a certificate of the chief financial officer, treasurer or the chief accounting officer of the Borrower certifying that the Borrower is in compliance with all covenants of the Borrower contained in this Agreement, including, without limitation, the requirements of Section 5.8, as of the Closing Date;

(o)receipt by the Administrative Agent of an executed amendment to the Credit Agreement dated as of March 29, 2012 among Borrower, JPMorgan Chase Bank, N.A., as administrative agent, and the lenders party thereto, in form and substance satisfactory to the Administrative Agent, by which the covenants and defaults under such Credit Agreement are conformed in all material respects to the covenants and defaults under this Agreement; and

(p)the General Partner shall intend to continue to qualify as a real estate investment trust under the Internal Revenue Code.

The Administrative Agent shall promptly notify the Borrower and the Banks of the Closing Date, and such notice shall be conclusive and binding on all parties hereto.

Section 24.Borrowings. The obligation of any Bank to make a Loan on the occasion of any Borrowing or to participate in any Letter of Credit issued by the Fronting Bank and the obligation of the Fronting Bank to issue a Letter of Credit or the obligation of the Swingline Lender to make a Swingline Loan on the occasion of any Borrowing is subject to the satisfaction of the following conditions:

(a)the Closing Date shall have occurred on or prior to December 15, 2012;

(b)receipt by the Administrative Agent of a Notice of Borrowing as required by Section 2.2 or 2.3;

(c)immediately after such Borrowing, the Outstanding Balance will not exceed the aggregate amount of the Commitments and with respect to each Bank, such Bank's pro rata portion of the Committed Loans and Letter of Credit Usage will not exceed such Bank's Commitment;

(d)immediately before and after such Borrowing, no Default or Event of Default shall have occurred and be continuing both before and after giving effect to the making of such Loans;

(e)the representations and warranties of the Borrower contained in this Agreement (other than representations and warranties which speak as of a specific date) shall be true and correct in all material respects on and as of the date of such Borrowing both before and after giving effect to the making of such Loans;

(f)no law or regulation shall have been adopted, no order, judgment or decree of any governmental authority shall have been issued, and no litigation shall be pending or threatened, which does or, with respect to any threatened litigation, seeks to enjoin, prohibit or restrain, the making or repayment of the Loans, the issuance of any Letter of Credit or any participations therein or the consummation of the transactions contemplated hereby; and

(g)no event, act or condition shall have occurred after the Closing Date which, in the reasonable judgment of the Administrative Agent or the Required Banks, as the case may be, has had or is likely to have a Material Adverse Effect.

Each Borrowing hereunder shall be deemed to be a representation and warranty by the Borrower on the date of such Borrowing as to the facts specified in clauses (c) through (f) of this Section (except that with respect to clause (f), such representation and warranty shall be deemed to be limited to laws, regulations, orders, judgments, decrees and litigation affecting the Borrower and not solely the Banks).

REPRESENTATIONS AND WARRANTIES

In order to induce the Administrative Agent and each of the other Banks which may become a party to this Agreement to make the Loans, the Borrower makes the following representations and warranties as of the date hereof. Such representations and warranties shall survive the effectiveness of this Agreement, the execution and delivery of the other Loan Documents and the making of the Loans.

Section 25.Existence and Power. The Borrower is duly organized, validly existing and in good standing as a limited partnership under the laws of the State of Delaware and has all powers and all material governmental licenses, authorizations, consents and approvals required to own its property and assets and carry on its business as now conducted or as it presently proposes to conduct and has been duly qualified and is in good standing in every jurisdiction in which the failure to be so qualified and/or in good standing is likely to have a Material Adverse Effect.

Section 26.Power and Authority. The Borrower has the organizational power and authority to execute, deliver and carry out the terms and provisions of each of the Loan Documents to which it is a party and has taken all necessary action to authorize the execution and delivery on behalf of the Borrower and the performance by the Borrower of such Loan Documents. The Borrower has duly executed and delivered each Loan Document to which it is a party, and each such Loan Document constitutes the legal, valid and binding obligation of the Borrower, enforceable in accordance with its terms, except as enforceability may be limited by applicable insolvency, bankruptcy or other laws affecting creditors rights generally, or general principles of equity, whether such enforceability is considered in a proceeding in equity or at law.

Section 27.No Violation. Neither the execution, delivery or performance by or on behalf of the Borrower of the Loan Documents, nor compliance by the Borrower with the terms and provisions thereof nor the consummation of the transactions contemplated by the Loan Documents, (i) will contravene any applicable provision of any law, statute, rule, regulation, order, writ, injunction or decree of any court or governmental instrumentality applicable to Borrower except to the extent such contravention is not likely to have a Material Adverse Effect, or (ii) will conflict with or result in any breach of, any of the terms, covenants, conditions or provisions of, or constitute a default under, or result in the creation or imposition of (or the obligation to create or impose) any Lien upon any of the property or assets of the Borrower pursuant to the terms of any material indenture, mortgage, deed of trust, or other agreement or other instrument to which the Borrower (or of any partnership of which the Borrower is a partner) is a party or by which it or any of its property or assets is bound or to which it is subject except to the extent such conflict or breach is not likely to have a Material Adverse Effect, or (iii) will conflict with or result in a breach of any organizational document of any Subsidiary, the certificate of limited partnership, partnership agreement or other organizational document of Borrower, or the General Partner's articles of incorporation or by-laws.

Section 28.Financial Information.

(a)The audited consolidated balance sheets and statements of income of the Borrower and the General Partner as of December 31, 2011 and the unaudited balance sheets and statements of income of the Borrower and the General Partner as of September 30, 2012 fairly present, in conformity with GAAP, the consolidated financial position of the Borrower and the General Partner as of such date and their consolidated results of operations for such fiscal periods.

(b)Since December 31, 2011, except as disclosed in public filings with the Securities and Exchange Commission (i) there has been no material adverse change in the business, financial position or results of operations of the Borrower or the General Partner and (ii) except as previously disclosed to the Administrative Agent and to the Banks, neither the Borrower nor the General Partner has incurred any material indebtedness or guaranty.

Section 29.Litigation.

(a)There is no action, suit or proceeding pending against, or to the knowledge of the Borrower, threatened against or affecting, (i) the Borrower, the General Partner or any of their Subsidiaries, (ii) the Loan Documents or any of the transactions contemplated by the Loan Documents or (iii) any of their assets, in any case before any court or arbitrator or any governmental body, agency or official which could reasonably be expected to have a Material Adverse Effect or which in any manner draws into question the validity of this Agreement or the other Loan Documents.

(b)There are no final nonappealable judgments or decrees in an aggregate amount of One Million Dollars ($1,000,000) or more entered by a court or courts of competent jurisdiction against the Borrower or the General Partner (other than any judgment as to which, and only to the extent, a reputable insurance company has acknowledged coverage of such claim in writing).

Section 30.Compliance with ERISA.

(a)Except as previously disclosed to the Administrative Agent in writing as of the Closing Date, each member of the ERISA Group has fulfilled its obligations under the minimum funding standards of ERISA and the Internal Revenue Code with respect to each Plan and is in compliance in all material respects with the presently applicable provisions of ERISA and the Internal Revenue Code with respect to each Plan. No member of the ERISA Group has (i) sought a waiver of the minimum funding standard under Section 412 of the Internal Revenue Code in respect of any Plan, (ii) failed to make any contribution or payment to any Plan or Multiemployer Plan or in respect of any Benefit Arrangement, or made any amendment to any Plan or Benefit Arrangement, which has resulted or could result in the imposition of a Lien or the posting of a bond or other security under ERISA or the Internal Revenue Code or (iii) incurred any liability under Title IV of ERISA other than a liability to the PBGC for premiums under Section 4007 of ERISA.

(b)Except for each “employee benefit plan” (as such term is defined in Section 3(3) of ERISA) that is maintained, participated in or contributed to, by one or more members of the ERISA Group, no member of the ERISA Group is a “party in interest” (as such term is defined in Section 3(14) of ERISA or a “disqualified person” (as such term is defined in Section 4975(e)(2) of the Internal Revenue Code) with respect to any funded employee benefit plan and none of the assets of any such plans have been invested in a manner that would cause the transactions contemplated by the Loan Documents to constitute a nonexempt prohibited transaction (as such term is defined in Section 4975 of the Internal Revenue Code or Section 406 of ERISA).

Section 31.Environmental Compliance. To the best of Borrower's knowledge, except as set forth in the Phase I environmental report(s) delivered to and accepted by the Administrative Agent with respect to each of the Unencumbered Asset Pool Properties (as supplemented or amended, the “Environmental Reports”), (i) there are in effect all Environmental Approvals which are required to be obtained under all Environmental Laws with respect to such Property, except for such Environmental Approvals the absence of which would not have a Material Adverse Effect, (ii) the Borrower is in compliance in all material respects with the terms and conditions of all such Environmental Approvals, and is also in compliance in all material respects with all other Environmental Laws or any plan, order, decree, judgment, injunction, notice or demand letter issued, entered or approved thereunder, except to the extent failure to comply would not have a Material Adverse Effect.

Except as set forth in the Environmental Reports or otherwise disclosed in writing to the Administrative Agent as of the Closing Date or with respect to a New Acquisition, as of the date of such New Acquisition, to Borrower's actual knowledge:

(i)There are no Environmental Claims or investigations pending or threatened by any Governmental Authority with respect to any alleged failure by the Borrower to have any Environmental Approval required in connection with the conduct of the business of the Borrower on any of the Unencumbered Asset Pool Properties, or with respect to any generation, treatment, storage, recycling, transportation, Release or disposal of any Material of Environmental Concern generated by the Borrower or any lessee on any of the Unencumbered Asset Pool Properties;

(ii)No Material of Environmental Concern has been Released at the Property to an extent that it may reasonably be expected to have a Material Adverse Effect;

(iii)No PCB (in amounts or concentrations which exceed those set by applicable Environmental Laws) is present at any of the Unencumbered Asset Pool Properties;

(iv)No friable asbestos is present at any of the Unencumbered Asset Pool Properties;

(v)There are no underground storage tanks for Material of Environmental Concern, active or abandoned, at any of the Unencumbered Asset Pool Properties;

(vi)No Environmental Claims have been filed with a Governmental Authority with respect to any of the Unencumbered Asset Pool Properties, and none of the Unencumbered Asset Pool Properties is listed or

proposed for listing on the National Priority List promulgated pursuant to CERCLA, on CERCLIS or on any similar state list of sites requiring investigation or clean-up;

(vii)There are no Liens arising under or pursuant to any Environmental Laws on any of the Unencumbered Asset Pool Properties, and no government actions have been taken or are in process which could subject any of the Unencumbered Asset Pool Properties to such Liens; and

(viii)There have been no environmental investigations, studies, audits, tests, reviews or other analyses conducted by, or which are in the possession of, the Borrower in relation to any of the Unencumbered Asset Pool Properties which have not been made available to the Administrative Agent.

Section 32.Taxes. The initial tax year of the Borrower for federal income tax purposes was 1996. The federal income tax returns of the Borrower and its Consolidated Subsidiaries for the fiscal year ended December 31, 2011 have been filed. The Borrower and its Subsidiaries have filed all United States Federal income tax returns and all other material tax returns which are required to be filed by them and have paid all taxes due pursuant to such returns or pursuant to any assessment received by the Borrower or any Subsidiary except those being contested in good faith. The charges, accruals and reserves on the books of the Borrower and its Subsidiaries in respect of taxes or other governmental charges are, in the opinion of the Borrower, adequate.

Section 33.Full Disclosure. All information heretofore furnished by the Borrower to the Administrative Agent or any Bank for purposes of or in connection with this Agreement or any transaction contemplated hereby is true and accurate in all material respects on the date as of which such information is stated or certified. The Borrower has disclosed to the Banks in writing any and all facts known to the Borrower which materially and adversely affect or are likely to materially and adversely affect (to the extent the Borrower can now reasonably foresee), the business, operations or financial condition of the Borrower considered as one enterprise or the ability of the Borrower to perform its obligations under this Agreement or the other Loan Documents.

Section 34.Solvency. On the Closing Date and after giving effect to the transactions contemplated by the Loan Documents occurring on the Closing Date, the Borrower is Solvent.

Section 35.Use of Proceeds; Margin Regulations. All proceeds of the Loans will be used by the Borrower only in accordance with the provisions hereof. No part of the proceeds of any Loan will be used by the Borrower to purchase or carry any Margin Stock or to extend credit to others for the purpose of purchasing or carrying any Margin Stock. Neither the making of any Loan nor the use of the proceeds thereof will violate or be inconsistent with the provisions of Regulations T, U or X of the Federal Reserve Board.

Section 36.Governmental Approvals. No order, consent, approval, license, authorization, or validation of, or filing, recording or registration with, or exemption by, any governmental or public body or authority, or any subdivision thereof, is required to authorize, or is required in connection with the execution, delivery and performance of any Loan Document or the consummation of any of the transactions contemplated thereby other than those that have already been duly made or obtained and remain in full force and effect.

Section 37.Investment Company Act; Public Utility Holding Company Act. The Borrower is not (x) an “investment company” or a company “controlled” by an “investment company”, within the meaning of the Investment Company Act of 1940, as amended, (y) a “holding company” or a “subsidiary company” of a “holding company” or an “affiliate” of either a “holding company” or a “subsidiary company” within the meaning of the Public Utility Holding Company Act of 1935, as amended, or (z) subject to any other federal or state law or regulation which purports to restrict or regulate its ability to borrow money.

Section 38.Closing Date Transactions. On the Closing Date and immediately prior to or concurrently with the making of the Loans, the transactions (other than the making of the Loans) intended to be consummated on the Closing Date will have been consummated in accordance with all applicable laws. On or prior to the Closing Date, all consents and approvals of, and filings and registrations with, and all other actions by, any Person required in order to make or consummate such transactions have been obtained, given, filed or taken and are in full force and effect.

Section 39.Representations and Warranties in Loan Documents. All representations and warranties made by the Borrower in the Loan Documents are true and correct in all material respects.

Section 40.Patents, Trademarks, etc. The Borrower has obtained and holds in full force and effect all patents, trademarks, service marks, trade names, copyrights and other such rights, free from burdensome restrictions, which are necessary for the operation of its business as presently conducted, the impairment of which is likely to have a Material Adverse Effect. To the Borrower's knowledge, no material product, process, method, substance, part or other material presently sold by or employed by the Borrower in connection with such business infringes any patent, trademark, service mark, trade name, copyright, license or other such right owned by any other Person. There is not pending or, to the Borrower's knowledge, threatened any claim or litigation against or affecting the Borrower contesting its right to sell or use any such product, process, method, substance, part or other material.

Section 41.No Default. No Default or Event of Default exists under or with respect to any Loan Document. The Borrower is not in default in any material respect beyond any applicable grace period under or with respect to any other material agreement, instrument or undertaking to which it is a party or by which it or any of its property is bound in

any respect, the existence of which default is likely (to the extent that the Borrower can now reasonably foresee) to result in a Material Adverse Effect.

Section 42.Licenses, etc. The Borrower has obtained and holds in full force and effect, all franchises, licenses, permits, certificates, authorizations, qualifications, accreditations, easements, rights of way and other consents and approvals which are necessary for the operation of its businesses as presently conducted, the absence of which is likely (to the extent that the Borrower can now reasonably foresee) to have a Material Adverse Effect.

Section 43.Compliance With Law. The Borrower is in compliance with all laws, rules, regulations, orders, judgments, writs and decrees, including, without limitation, all building and zoning ordinances and codes, the failure to comply with which is likely (to the extent that the Borrower can now reasonably foresee) to have a Material Adverse Effect.

Section 44.No Burdensome Restrictions. The Borrower is not a party to any agreement or instrument or subject to any other obligation or any charter or corporate or partnership restriction, as the case may be, which, individually or in the aggregate, is likely (to the extent that the Borrower can now reasonably foresee) to have a Material Adverse Effect.

Section 45.Brokers' Fees. The Borrower has not dealt with any broker or finder with respect to the transactions contemplated by the Loan Documents (except with respect to the acquisition or disposition of Real Property Assets) or otherwise in connection with this Agreement other than J.P. Morgan Securities LLC and Merrill Lynch, Pierce, Fenner & Smith Incorporated, the fees and expenses of which shall be paid by Borrower, and the Borrower has not done any acts, had any negotiations or conversation, or made any agreements or promises which will in any way create or give rise to any obligation or liability for the payment by the Borrower of any brokerage fee, charge, commission or other compensation to any party with respect to the transactions contemplated by the Loan Documents (except with respect to the acquisition or disposition of Real Property Assets), other than the fees payable hereunder.

Section 46.Labor Matters. Except as set forth on Schedule 4.22 attached hereto and made a part hereof, there are no collective bargaining agreements or Multiemployer Plans covering the employees of the Borrower and the Borrower has not suffered any strikes, walkouts, work stoppages or other material labor difficulty within the last five (5) years.

Section 47.Organizational Documents. The documents delivered pursuant to Section 3.1(e) constitute, as of the Closing Date, all of the organizational documents (together with all amendments and modifications thereof) of the Borrower. The Borrower represents that it has delivered to the Administrative Agent true, correct and complete copies of each of the documents set forth in this Section 4.23.

Section 48.Principal Offices. The principal office, chief executive office and principal place of business of the Borrower is 12200 West Olympic Boulevard, Suite 200, Los Angeles, California 90064.

Section 49.REIT Status. For the fiscal year ended December 31, 2011, the General Partner qualified, and the General Partner intends to continue to qualify, as a real estate investment trust under the Internal Revenue Code.

Section 50.Ownership of Property. The Borrower and/or the General Partner, directly or indirectly, owns fee simple title to or a ground leasehold interest in each of the Unencumbered Asset Pool Properties.

Section 51.Insurance. The Borrower or its tenants, as applicable, currently maintains insurance at 100% replacement cost insurance coverage in respect of each of the Real Property Assets, as well as comprehensive general liability insurance (including “builders' risk”) against claims for personal, and bodily injury and/or death, to one or more persons, or property damage, as well as workers' compensation insurance, in each case with respect to the Real Property Assets with insurers having an A.M. Best policyholders' rating of not less than A-VIII in amounts that prudent owner of assets such as the Real Property Assets would maintain.

AFFIRMATIVE AND NEGATIVE COVENANTS

The Borrower covenants and agrees that, so long as any Bank has any Commitment hereunder or any Loan or Letter of Credit is outstanding or any Obligations remain unpaid:

Section 52.Information. The Borrower will deliver:

(a)to the Administrative Agent and to each of the Banks (which delivery may be made electronically, including via IntraLinks), as soon as available and in any event within 105 days after the end of each fiscal year of the Borrower, an audited consolidated balance sheet of the Borrower as of the end of such fiscal year and the related consolidated statements of cash flow and operations for such fiscal year, setting forth in each case in comparative form the figures for the previous fiscal year, audited by Deloitte & Touche or other independent public accountants of similar standing;

(b)to the Administrative Agent and to each of the Banks (which delivery may be made electronically, including via IntraLinks), as soon as available and in any event within sixty (60) days after the end of each quarter of each fiscal year (other than the last quarter in any fiscal year) of the Borrower, a statement of the Borrower, prepared in accordance with GAAP, setting forth the operating income and operating expenses of the Borrower, in sufficient detail so as to calculate Unencumbered Asset Pool Net Operating Cash Flow of the Borrower for the immediately preceding quarter;

(c)to the Administrative Agent and to each of the Banks (which delivery may be made electronically, including via IntraLinks), simultaneously with the delivery of each set of financial statements referred to in clauses (a) and (b) above, a certificate of the chief financial officer, controller, treasurer or vice president-corporate finance of the Borrower (i) setting forth in reasonable detail the calculations required to establish whether the Borrower was in compliance with the

requirements of Section 5.8 on the date of such financial statements;(ii) stating whether any Default exists on the date of such certificate and, if any Default then exists, setting forth the details thereof and the action which the Borrower is taking or proposes to take with respect thereto; and (iii) certifying (x) that such financial statements fairly present the financial condition and the results of operations of the Borrower as of the dates and for the periods indicated, in accordance with GAAP, subject, in the case of interim financial statements, to normal year-end adjustments, and (y) that such officer has reviewed the terms of the Loan Documents and has made, or caused to be made under his or her supervision, a review in reasonable detail of the business and condition of the Borrower during the period beginning on the date through which the last such review was made pursuant to this Section 5.1(c) and ending on a date not more than ten (10) Domestic Business Days prior to the date of such delivery and that on the basis of such review of the Loan Documents and the business and condition of the Borrower, to the best knowledge of such officer, no Default or Event of Default under any other provision of Section 6.1 occurred or, if any such Default or Event of Default has occurred, specifying the nature and extent thereof and, if continuing, the action the Borrower proposes to take in respect thereof;

(d)to the Administrative Agent and to each of the Banks, (i) within five (5) days after the president, chief financial officer, treasurer, controller or other executive officer of the Borrower obtains knowledge of any Default, if such Default is then continuing, a certificate of the chief financial officer or the president of the Borrower setting forth the details thereof and the action which the Borrower is taking or proposes to take with respect thereto; and (ii) promptly and in any event within ten (10) days after the Borrower obtains knowledge thereof, notice of (x) any litigation or governmental proceeding pending or threatened against the Borrower which is likely to individually or in the aggregate, result in a Material Adverse Effect, and (y) any other event, act or condition which is likely to result in a Material Adverse Effect;

(e)to the Administrative Agent and to each of the Banks, if and when any member of the ERISA Group (i) gives or is required to give notice to the PBGC of any “reportable event” (as defined in Section 4043 of ERISA) with respect to any Plan which might constitute grounds for a termination of such Plan under Title IV of ERISA, or knows that the plan administrator of any Plan has given or is required to give notice of any such reportable event, a copy of the notice of such reportable event given or required to be given to the PBGC; (ii) receives notice of complete or partial withdrawal liability under Title IV of ERISA or notice that any Multiemployer Plan is in reorganization, is insolvent or has been terminated, a copy of such notice; (iii) receives notice from the PBGC under Title IV of ERISA of an intent to terminate, impose liability (other than for premiums under Section 4007 of ERISA) in respect of, or appoint a trustee to administer any Plan, a copy of such notice; (iv) applies for a waiver of the minimum funding standard under Section 412 of the Internal Revenue Code, a copy of such application; (v) gives notice of intent to terminate any Plan under Section 4041(c) of ERISA, a copy of such notice and other information filed with the PBGC; (vi) gives notice of withdrawal from any Plan pursuant to Section 4063 of ERISA, a copy of such notice; or (vii) fails to make any payment or contribution to any Plan or Multiemployer Plan or in respect of any Benefit Arrangement or makes any amendment to any Plan or Benefit Arrangement which has resulted or could result in the imposition of a Lien or the posting of a bond or other security, a certificate of the chief financial officer or the chief accounting officer of the Borrower setting forth details as to such occurrence and action, if any, which the Borrower or applicable member of the ERISA Group is required or proposes to take;

(f)to the Administrative Agent and to each of the Banks, promptly and in any event within five (5) Domestic Business Days after the Borrower obtains actual knowledge of any of the following events, a certificate of the Borrower executed by an officer of the Borrower specifying the nature of such condition and the Borrower's, and if the Borrower has actual knowledge thereof, the Environmental Affiliate's proposed initial response thereto: (i) the receipt by the Borrower, or, if the Borrower has actual knowledge thereof, any of the Environmental Affiliates, of any communication (written or oral), whether from a governmental authority, citizens group, employee or otherwise, that alleges that the Borrower, or, if the Borrower has actual knowledge thereof, any of the Environmental Affiliates, is not in compliance with applicable Environmental Laws, and such noncompliance is likely to have a Material Adverse Effect, (ii) the Borrower shall obtain actual knowledge that there exists any Environmental Claim which is likely to have a Material Adverse Effect pending or threatened against the Borrower or any Environmental Affiliate or (iii) the Borrower obtains actual knowledge of any release, emission, discharge or disposal of any Material of Environmental Concern that is likely to form the basis of any Environmental Claim against the Borrower or any Environmental Affiliate;

(g)to the Administrative Agent and to each of the Banks, promptly and in any event within five (5) Domestic Business Days after receipt of any material notices or correspondence from any company or agent for any company providing insurance coverage to the Borrower relating to any material loss or loss of the Borrower with respect to any of the Unencumbered Asset Pool Properties, copies of such notices and correspondence; and

(h)to the Administrative Agent and to each of the Banks (which delivery may be made electronically, including via IntraLinks or posting to the internet website of the General Partner), promptly upon the mailing thereof to the shareholders or partners of the Borrower, copies of all financial statements, reports and proxy statements so mailed;

(i)to the Administrative Agent and to each of the Banks (which delivery may be made electronically, including via IntraLinks or posting to the internet website of the General Partner), promptly upon the filing thereof, copies of all registration statements (other than the exhibits thereto and any registration statements on Form S-8 or its equivalent) and reports on Forms 10-K, 10-Q and 8-K (or their equivalents) which the Borrower shall have filed with the Securities and Exchange Commission;

(j)to the Administrative Agent and to each of the Banks (which delivery may be made electronically, including via IntraLinks), simultaneously with delivery of the information required by Sections 5.1(a) and (b), a statement of Unencumbered Asset Pool Net Operating Cash Flow with respect to each Unencumbered Asset Pool Property and a list of all Unencumbered Asset Pool Properties; and

(k)to the Administrative Agent and to each of the Banks (which delivery may be made electronically, including via IntraLinks), from time to time such additional information regarding the financial position or business of the Borrower as the Administrative Agent, at the request of any Bank, may reasonably request.

Section 53.Payment of Obligations. The Borrower will pay and discharge, at or before maturity, all its material obligations and liabilities including, without limitation, any obligation pursuant to any agreement by which it or any of its properties is bound and any tax liabilities, in any case, where failure to do so will likely result in a Material Adverse Effect except (i) such tax liabilities may be contested in good faith by appropriate proceedings, and will maintain in accordance with GAAP, appropriate reserves for the accrual of any of the same; or (ii) such obligation or liability as may be contested in good faith by appropriate proceedings.

Section 54.Maintenance of Property; Insurance.

(a)The Borrower will keep each of the Unencumbered Asset Pool Properties in good repair, working order and condition, subject to ordinary wear and tear.

(b)The Borrower shall (a) maintain insurance as specified in Section 4.27 hereof with insurers meeting the qualifications described therein, which insurance shall in any event not provide for materially less coverage than the insurance in effect on the Closing Date, and (b) furnish to each Bank, or use reasonable efforts to obtain from a tenant, if applicable, from time to time, upon written request, copies of the policies under which such insurance is issued, certificates of insurance and such other information relating to such insurance as such Bank may reasonably request. The Borrower will deliver to the Banks (i) upon request of any Bank through the Administrative Agent from time to time, full information as to the insurance carried, (ii) within five (5) days of receipt of notice from any insurer, a copy of any notice of cancellation or material change in coverage from that existing on the date of this Agreement and (iii) forthwith, notice of any cancellation or nonrenewal of coverage by the Borrower.

Section 55.Conduct of Business. The Borrower's primary business will continue to be acquiring, owning, operating, managing, developing (to the extent permitted in this Agreement), and leasing office and industrial properties.

Section 56.Compliance with Laws. (a) The Borrower will comply in all material respects with all applicable laws, ordinances, rules, regulations, and requirements of governmental authorities (including, without limitation, Environmental Laws, all zoning and building codes and ERISA and the rules and regulations thereunder) except where the necessity of compliance therewith is contested in good faith by appropriate proceedings.

(a)In the ordinary course of its business and at such times as Borrower reasonably deems appropriate, Borrower shall conduct periodic reviews of the effect of Environmental Laws on its business, operations and properties, in the course of which it shall use commercially reasonable efforts to identify and evaluate applicable liabilities and costs (including, without limitation, any capital or operating expenditures required as a matter of Environmental Law for clean-up or closure of properties presently or previously owned, any capital or operating expenditures required as a matter of Environmental Law to achieve or maintain compliance with Environmental Law or as a condition of any license, permit or contract to which Borrower is a party or a beneficiary, any related constraints on operating activities, including, without limitation, any periodic or permanent shutdown of any facility or reduction in the level of or change in the nature of operations conducted thereat, any costs or liabilities in connection with off-site disposal of wastes or Materials of Environmental Concern, and any actual or potential liabilities to third parties, including, without limitation, employees, and any related costs and expenses). Borrower shall notify the Administrative Agent immediately if, on the basis of any such review, such Borrower has reasonably concluded that such associated potential liabilities and costs, including, without limitation, the costs of compliance with Environmental Laws, could reasonably be expected to have a Material Adverse Effect.

Section 57.Inspection of Property, Books and Records. The Borrower will keep proper books of record and account in which full, true and correct entries shall be made of all dealings and transactions in relation to its business and activities; and will permit representatives of any Bank at such Bank's expense to visit and inspect any of its properties to examine and make abstracts from any of its books and records and to discuss its affairs, finances and accounts with its officers and employees, all at such reasonable times, upon reasonable notice, but in no event more than once each fiscal year unless an Event of Default has occurred and is continuing, then as often as may reasonably be desired.

Section 58.Existence.

(a)The Borrower shall do or cause to be done all things necessary to preserve and keep in full force and effect its corporate existence or its partnership existence, as applicable.

(b)The Borrower shall do or cause to be done all things necessary to preserve and keep in full force and effect its patents, trademarks, servicemarks, tradenames, copyrights, franchises, licenses, permits, certificates, authorizations, qualifications, accreditations, easements, rights of way and other rights, consents and approvals the nonexistence of which is likely to have a Material Adverse Effect.

Section 59.Financial Covenants.

(a)Total Debt to Total Asset Value. As of the last day of each calendar quarter, the Total Debt Ratio will not be greater than 60%; provided, however, with respect to any period in which Borrower or any of its Consolidated Subsidiaries have acquired a Real Property Asset (or multiple Real Property Assets in a single transaction) for a price of more than $150,000,000, Total Debt to Total Asset Value for such quarter and the next succeeding quarter may increase to 65%, provided such ratio does not exceed 60% thereafter.

(b)Fixed Charge Coverage. As of the last day of each calendar quarter, the ratio of (x) Annual EBITDA, less reserves for Capital Expenditures of (i) $.30 per square foot per annum for each Real Property Asset that is an office property and (ii) $.15 per square foot per annum for each Real Property Asset that is an industrial property, to (y) the sum of (i) Total Debt Service and (ii) dividends or other payments payable by the General Partner with respect to any preferred stock issued by the General Partner and distributions or other payments payable by the Borrower with respect to any preferred partnership units of the Borrower, will not be less than 1.5:1.0.

(c)Limitation on Secured Debt. Secured Debt of the Borrower, the General Partner and their Consolidated Subsidiaries, which for purposes hereof shall be deemed to include the Borrower's and the General Partner's pro rata share of the Secured Debt of any Minority Holdings of the Borrower or the General Partner, shall at no time exceed thirty percent (30%) of Total Asset Value.

(d)Unsecured Debt Ratio. As of each of (x) the last day of each calendar quarter, and (y) any Borrowing, the Unsecured Debt Ratio shall not be less than 1.67:1.0.

(e)Unencumbered Asset Pool Debt Service Coverage. As of the last day of each calendar quarter and as of the date of any sale or secured financing of any Unencumbered Asset Pool Property, the ratio of (i) Unencumbered Asset Pool Net Operating Cash Flow to (ii) Unsecured Debt Service will not be less than 2.0:1.0.

(f)Dividends. The Borrower will not, as determined on an aggregate annual basis, pay any partnership distributions in excess of the greater of (i) 95% of its consolidated FFO for such year, and (ii) an amount which results in distributions to the General Partner (excluding therefrom any preferred partnership distributions to the extent the same have been deducted from consolidated FFO for such year) in an amount sufficient to permit the General Partner to pay dividends to its shareholders which it reasonably believes are necessary for it to (A) maintain its qualification as a real estate investment trust for federal and state income tax purposes, and (B) avoid the payment of federal or state income or excise tax. During the continuance of an Event of Default under Section 6.1(a), the Borrower shall make only those partnership distributions necessary to make distributions to the General Partner to pay dividends to its shareholders which it reasonably believes are necessary to maintain its status as a real estate investment trust for federal and state income tax purposes.

(g)Minimum Consolidated Tangible Net Worth. The Consolidated Tangible Net Worth will at no time be less than the sum of (i) $1,300,000,000 plus (ii) 75% of all Net Offering Proceeds received from and after August 10, 2010.

Section 60.Restriction on Fundamental Changes; Operation and Control. (a) The Borrower shall not enter into any merger or consolidation, unless the Borrower is the surviving entity, or liquidate, wind-up or dissolve (or suffer any liquidation or dissolution), discontinue its business or convey, lease, sell, transfer or otherwise dispose of, in one transaction or series of transactions, any substantial part of the business or property of the Borrower and its Subsidiaries, taken as a whole, whether now or hereafter acquired, hold an interest in any subsidiary which is not controlled by the Borrower or the General Partner or enter into other business lines, without the prior written consent of the Administrative Agent, which consent shall not be given unless the Required Banks so consent.

(a)The Borrower shall not amend its articles of incorporation, by-laws or agreement of limited partnership, as applicable, in any material respect which is reasonably likely to have an adverse effect on the Banks, without the Administrative Agent's consent, which shall not be unreasonably withheld or delayed.

Section 61.Changes in Business. The Borrower shall not enter into any business which is substantially different from that conducted by the Borrower on the Closing Date after giving effect to the transactions contemplated by the Loan Documents.

Section 62.Sale of Unencumbered Asset Pool Properties. Concurrent with the sale or transfer of any Unencumbered Asset Pool Property that exceeds fifteen percent (15%) of the Unencumbered Asset Pool Properties Value, the Borrower shall (i) deliver written notice to the Administrative Agent, (ii) deliver to the Administrative Agent a certificate from its chief financial officer, chief accounting officer, vice president or other duly authorized officer certifying that at the time of such sale or other disposal (based on pro-forma calculations for the previous period assuming that such Unencumbered Asset Pool Property was not a Unencumbered Asset Pool Property for the relevant period) all of the covenants contained in Sections 5.8, 5.14 and 5.17 are and after giving effect to the transaction shall continue to be true and accurate in all respects, and (iii) pay to the Administrative Agent an amount equal to that, if any, required pursuant to Section 2.10(a). In the event that a Separate Parcel that originally formed a part of a Unencumbered Asset Pool Property is to be sold or transferred, the value of the remaining portion of the Unencumbered Asset Pool Property will be determined by Administrative Agent at the time of sale or transfer in its sole discretion.

Section 63.Fiscal Year; Fiscal Quarter. The Borrower shall not change its fiscal year or any of its fiscal quarters without the Administrative Agent's prior written consent, which consent shall not be unreasonably withheld or delayed.

Section 64.Margin Stock. None of the proceeds of the Loan will be used, directly or indirectly, for the purpose, whether immediate, incidental or ultimate, of buying or carrying any Margin Stock.

Section 65.Use of Proceeds. The Borrower shall use the proceeds of the Loans for its general business purposes; provided, however, that no Swingline Loan shall be used for the purpose of refinancing another Swingline Loan, in whole or part.

Section 66.General Partner Status. The General Partner shall at all times (i) maintain its status as a self-directed and self-administered real estate investment trust under the Internal Revenue Code, and (ii) remain a publicly traded company listed on the New York Stock Exchange.

DEFAULTS

Section 67.Events of Default. Each of the following shall constitute an event of default under this Agreement (an “Event of Default”):

(a)the Borrower shall fail to pay when due any principal of any Loan, or the Borrower shall fail to pay when due any interest on any Loan; provided, however, that the Borrower shall be entitled to a three (3) Domestic Business Day grace period with respect thereto but only as to two (2) payments of interest during the Term, or the Borrower shall fail to pay within three (3) Domestic Business Days after the same is due any fees or other amounts payable hereunder;

(b)the Borrower shall fail to observe or perform any covenant contained in Sections 5.8 to 5.17, inclusive, subject to any applicable grace periods set forth therein;

(c)the Borrower shall fail to observe or perform any covenant or agreement contained in this Agreement (other than those covered by clause (a) or (b) above) for 30 days after written notice thereof has been given to the Borrower by the Administrative Agent;

(d)any representation, warranty, certification or statement made by the Borrower in this Agreement or in any certificate, financial statement or other document delivered pursuant to this Agreement shall prove to have been incorrect in any material respect when made (or deemed made);

(e)the Borrower, the General Partner or any Material Subsidiary shall default in the payment when due (whether by scheduled maturity, required prepayment, acceleration, demand or otherwise) of any amount owing in respect of any Recourse Debt or Debt guaranteed by the Borrower, the General Partner or such Material Subsidiary (other than the Obligations) in an aggregate principal amount of more than $50,000,000 and such default shall continue beyond the giving of any required notice and the expiration of any applicable grace period (as the same may be extended by the applicable lender) and such default shall not be waived by the applicable lender (which waiver shall serve to reinstate the applicable loan), or the Borrower, the General Partner or any Material Subsidiary shall default in the performance or observance of any obligation or condition with respect to any such Debt or any other event shall occur or condition exist beyond the giving of any required notice and the expiration of any applicable grace period (as the same may be extended by the applicable lender), if in any such case as a result of such default, event or condition, the lender (including the holder or holders thereof, or any trustee or agent for such holders) of any such Debt shall accelerate the maturity of any such Debt or shall be permitted (without any further requirement of notice or lapse of time), to accelerate the maturity of any such Debt and such default shall not be waived by the applicable lender (which waiver shall serve to reinstate the applicable loan), or any such Debt shall become or be declared to be due and payable prior to its stated maturity other than as a result of a regularly scheduled payment;

(f)the Borrower, the General Partner or any Material Subsidiary shall commence a voluntary case or other proceeding seeking liquidation, reorganization or other relief with respect to itself or its debts under any bankruptcy, insolvency or other similar law now or hereafter in effect or seeking the appointment of a trustee, receiver, liquidator, custodian or other similar official of it or any substantial part of its property, or shall consent to any such relief or to the appointment of or taking possession by any such official in an involuntary case or other proceeding commenced against it, or shall make a general assignment for the benefit of creditors, or shall fail generally to pay its debts as they become due, or shall take any corporate action to authorize any of the foregoing;

(g)an involuntary case or other proceeding shall be commenced against the Borrower, the General Partner or any Material Subsidiary seeking liquidation, reorganization or other relief with respect to it or its debts under any bankruptcy, insolvency or other similar law now or hereafter in effect or seeking the appointment of a trustee, receiver, liquidator, custodian or other similar official of it or any substantial part of its property, and such involuntary case or other proceeding shall remain undismissed and unstayed for a period of 60 days; or an order for relief shall be entered against the Borrower, the General Partner or any Material Subsidiary under the federal bankruptcy laws as now or hereafter in effect;

(h)the Borrower shall default in its obligations under any Loan Document other than this Agreement beyond any applicable notice and grace periods;

(i)the General Partner shall default in its obligations under the Guaranty beyond any applicable notice and grace periods;

(j)any member of the ERISA Group shall fail to pay when due an amount or amounts aggregating in excess of $1,000,000 which it shall have become liable to pay under Title IV of ERISA, or notice of intent to terminate a Material Plan shall be filed under Title IV of ERISA by any member of the ERISA Group, any plan administrator or any combination of the foregoing, or the PBGC shall institute proceedings under Title IV of ERISA to terminate, to impose liability

(other than for premiums under Section 4007 of ERISA) in respect of, or to cause a trustee to be appointed to administer any Material Plan, or a condition shall exist by reason of which the PBGC would be entitled to obtain a decree adjudicating that any Material Plan must be terminated, or there shall occur a complete or partial withdrawal from, or a default, within the meaning of Section 4219(c)(5) of ERISA, with respect to, one or more Multiemployer Plans which could cause one or more members of the ERISA Group to incur a current payment obligation in excess of $1,000,000;

(k)one or more final nonappealable judgments or decrees in an aggregate amount of $10,000,000 as of such date shall be entered by a court or courts of competent jurisdiction against the Borrower or the General Partner (other than any judgment as to which, and only to the extent, a reputable insurance company has acknowledged coverage of such claim in writing) and (i) any such judgments or decrees shall not be stayed, discharged, paid, bonded or vacated within thirty (30) days (or bonded, vacated or satisfied within thirty (30) after any stay is lifted) or (ii) enforcement proceedings shall be commenced by any creditor on any such judgments or decrees;

(l)(i) any Environmental Claim shall have been asserted against the Borrower or any Environmental Affiliate, (ii) any release, emission, discharge or disposal of any Material of Environmental Concern shall have occurred, and such event is reasonably likely to form the basis of an Environmental Claim against the Borrower or any Environmental Affiliate, or (iii) the Borrower or the Environmental Affiliates shall have failed to obtain any Environmental Approval necessary for the ownership, or operation of its business, property or assets or any such Environmental Approval shall be revoked, terminated, or otherwise cease to be in full force and effect, in the case of clauses (i), (ii) or (iii) above, if the existence of such condition has had or is reasonably likely to have a Material Adverse Effect;

(m)(i) during any consecutive twenty-four month period commencing on or after the date hereof, individuals who at the beginning of such period constituted the Board of Directors of the General Partner of the Borrower (together with any new directors whose election by the Board of Directors or whose nomination for election by the General Partner stockholders was approved by a vote of at least a majority of the members of the Board of Directors then in the office who either were members of the Board of Directors at the beginning of such period or whose election or nomination for election was previously so approved) cease for any reason to constitute a majority of the members of the Board of Directors then in office, except for any such change resulting from (x) death or disability of any such member, (y) satisfaction of any requirement for the majority of the members of the Board of Directors of the General Partner to qualify under applicable law as independent directors, or (z) the replacement of any member of the Board of Directors who is an officer or employee of the General Partner with any other officer or employee of the General Partner or its Affiliate; or (ii) the acquisition of ownership, directly or indirectly, beneficially or of record, by any Person or group (within the meaning of the Securities Exchange Act of 1934 and the rules of the Securities and Exchange Commission thereunder as in effect on the date hereof) of equity interests representing more than thirty-five percent (35%) of the aggregate ordinary voting power represented by the issued and outstanding equity interests of the General Partner;

(n)the General Partner shall cease at any time to qualify as a real estate investment trust under the Internal Revenue Code; and

(o)at any time, for any reason, the Borrower or the General Partner seeks to repudiate its obligations under any Loan Document.

Section 68.Rights and Remedies. (a) Upon the occurrence of any Event of Default described in Sections 6.1(f) or (g), the unpaid principal amount of, and any and all accrued interest on, the Loans and any and all accrued fees and other Obligations hereunder shall automatically become immediately due and payable, with all additional interest from time to time accrued thereon and without presentment, demand, or protest or other notices or requirements of any kind (including, without limitation, valuation and appraisement, diligence, presentment, notice of intent to demand or accelerate and notice of acceleration), all of which are hereby expressly waived by the Borrower; and upon the occurrence and during the continuance of any other Event of Default, the Administrative Agent may, and at the request of the Required Banks shall, exercise any of its rights and remedies hereunder and by written notice to the Borrower, declare the Commitment of each Bank to make Loans to be terminated whereupon the same shall forthwith terminate, declare the unpaid principal amount of and any and all accrued and unpaid interest on the Loans and any and all accrued fees and other Obligations hereunder to be, and the same shall thereupon be, immediately due and payable with all additional interest from time to time accrued thereon and without presentation, demand, or protest or other requirements of any kind other than as provided in the Loan Documents (including, without limitation, valuation and appraisement, diligence, presentment, and notice of intent to demand or accelerate), all of which are hereby expressly waived by the Borrower.

(a)Notwithstanding the foregoing, upon the occurrence and during the continuance of any Event of Default other than any Event of Default described in Sections 6.1(f) or (g), the Administrative Agent shall not exercise any of its rights and remedies hereunder nor declare the unpaid principal amount of and any and all accrued and unpaid interest on the Loans and any and all accrued fees and other Obligations hereunder to be immediately due and payable, until such time as the Administrative Agent shall have delivered a notice to the Banks specifying the Event of Default which has occurred and whether Administrative Agent recommends the acceleration of the Obligations due hereunder or the exercise of other remedies hereunder. The Banks shall notify the Administrative Agent if they approve or disapprove of the acceleration of the Obligations due hereunder or the exercise of such other remedy recommended by Administrative Agent within five (5) Domestic Business Days after receipt of such notice. If any Bank shall not respond within such five (5) Domestic Business Day period, then such

Bank shall be deemed to have accepted Administrative Agent's recommendation for acceleration of the Obligations due hereunder or the exercise of such other remedy. Regardless of the Administrative Agent's recommendation, if the Required Banks shall approve the acceleration of the Obligations due hereunder or the exercise of such other remedy, then Administrative Agent shall declare the Commitment of each Bank to make Loans to be terminated whereupon the same shall forthwith terminate and declare the unpaid principal amount of and any and all accrued and unpaid interest on the Loans and any and all accrued fees and other Obligations hereunder to be immediately due and payable or exercise such other remedy approved by the Required Banks. If the Required Banks shall neither approve nor disapprove the acceleration of the Obligations due hereunder or such other remedy recommended by Administrative Agent, then Administrative Agent may accelerate the Obligations due hereunder or exercise any of its rights and remedies hereunder in its sole discretion. If the Required Banks shall disapprove the acceleration of the Obligations due hereunder or the exercise of such other remedy recommended by Administrative Agent, but approve of another remedy, then to the extent permitted hereunder, Administrative Agent shall exercise such remedy. In the event the Administrative Agent exercises any remedy provided in any of the Loan Documents, the Administrative Agent shall act as a collateral agent for the Banks.

(b)Notwithstanding the foregoing, if in Administrative Agent's sole judgment, immediate action is required after an Event of Default has occurred to prevent loss to the Banks, the Administrative Agent may exercise any of its rights and remedies pursuant to this Agreement, including, without limitation, acceleration of the Obligations hereunder, without the prior consent of the Required Banks provided that the Administrative Agent has notified the Banks of its intention so to exercise such rights and remedies and within 48 hours (such hours being counted only on Domestic Business Days) thereafter the Required Banks have not instructed the Administrative Agent to the contrary.

Section 69.Notice of Default. If the Administrative Agent shall not already have given any notice to the Borrower under Section 6.1, the Administrative Agent shall give notice to the Borrower under Section 6.1 promptly upon being requested to do so by the Required Banks and shall thereupon notify all the Banks thereof.

Section 70.Actions in Respect of Letters of Credit. (a) If, at any time and from time to time, any Letter of Credit shall have been issued hereunder and an Event of Default shall have occurred and be continuing, then, upon the occurrence and during the continuation thereof, the Administrative Agent may, and if requested by the Required Banks the Administrative Agent shall, whether in addition to the taking by the Administrative Agent of any of the actions described in this Article or otherwise, make a demand upon the Borrower to, and forthwith upon such demand (but in any event within ten (10) days after such demand) the Borrower shall, pay to the Administrative Agent, on behalf of the Banks, in same day funds at the Administrative Agent's office designated in such demand, for deposit in a special cash collateral account (the “Letter of Credit Collateral Account”) to be maintained in the name of the Administrative Agent (on behalf of the Banks) and under its sole dominion and control at such place as shall be designated by the Administrative Agent, an amount equal to the amount of the Letter of Credit Usage under the Letters of Credit; provided that if an Event of Default described in Section 6.1(f) or (g) has occurred and is continuing, such obligation of the Borrower to deliver such amounts to the Cash Collateral Account shall become automatically due and payable without presentment, demand, protest or other notices or requirements of any kind, all of which are hereby expressly waived by the Borrower. The Borrower shall also deposit amounts into the Letter of Credit Collateral Account in accordance with Section 9.8(c)(ii). Interest shall accrue on the Letter of Credit Collateral Account at a rate equal to the rate on overnight funds.

(a)The Borrower hereby pledges, assigns and grants to the Administrative Agent, as administrative agent for its benefit and the ratable benefit of the Banks a lien on and a security interest in, the following collateral (the “Letter of Credit Collateral”):

(i)the Letter of Credit Collateral Account, all cash deposited therein and all certificates and instruments, if any, from time to time representing or evidencing the Letter of Credit Collateral Account;

(ii)all notes, certificates of deposit and other instruments from time to time hereafter delivered to or otherwise possessed by the Administrative Agent for or on behalf of the Borrower in substitution for or in respect of any or all of the then existing Letter of Credit Collateral;

(iii)all interest, dividends, cash, instruments and other property from time to time received, receivable or otherwise distributed in respect of or in exchange for any or all of the then existing Letter of Credit Collateral; and

(iv)to the extent not covered by the above clauses, all proceeds of any or all of the foregoing Letter of Credit Collateral.

The lien and security interest granted hereby secures the payment of all obligations of the Borrower now or hereafter existing hereunder and under any other Loan Document.

(b)The Borrower hereby authorizes the Administrative Agent for the ratable benefit of the Banks to apply, from time to time after funds are deposited in the Letter of Credit Collateral Account, funds then held in the Letter of Credit Collateral Account to the payment of any amounts, in such order as the Administrative Agent may elect, as shall have become due and payable by the Borrower to the Banks in respect of the Letters of Credit.

(c)Neither the Borrower nor any Person claiming or acting on behalf of or through the Borrower shall have any right to withdraw any of the funds held in the Letter of Credit Collateral Account, except as provided in Section 6.4(h) hereof.

(d)The Borrower agrees that it will not (i) sell or otherwise dispose of any interest in the Letter of Credit Collateral or (ii) create or permit to exist any lien, security interest or other charge or encumbrance upon or with respect to any of the Letter of Credit Collateral, except for the security interest created by this Section 6.4.

(e)If any Event of Default shall have occurred and be continuing:

(i)The Administrative Agent may, in its sole discretion, without notice to the Borrower except as required by law and at any time from time to time, charge, set off or otherwise apply all or any part of the Letter of Credit Collateral first, (x) amounts previously drawn on any Letter of Credit that have not been reimbursed by the Borrower and (y) any Letter of Credit Usage described in clause (ii) of the definition thereof that are then due and payable and second, any other unpaid Obligations then due and payable against the Letter of Credit Collateral Account or any part thereof, in such order as the Administrative Agent shall elect. The rights of the Administrative Agent under this Section 6.4 are in addition to any rights and remedies which any Bank may have.

(ii)The Administrative Agent may also exercise, in its sole discretion, in respect of the Letter of Credit Collateral Account, in addition to the other rights and remedies provided herein or otherwise available to it, all the rights and remedies of a secured party upon default under the Uniform Commercial Code in effect in the State of New York at that time.

(f)The Administrative Agent shall be deemed to have exercised reasonable care in the custody and preservation of the Letter of Credit Collateral if the Letter of Credit Collateral is accorded treatment substantially equal to that which the Administrative Agent accords its own property, it being understood that, assuming such treatment, the Administrative Agent shall not have any responsibility or liability with respect thereto.

(g)At such time as (x) all Events of Default have been cured or waived in writing and (y) all cash collateral (or the appropriate portion thereof) provided to reduce the Fronting Bank's exposure to any Defaulting Lender's Letter of Credit Usage pursuant to Section 9.8(c)(ii) shall no longer be required to be held as cash collateral pursuant to this Section 6.4 as a result of (x) the elimination or reduction of the applicable exposure to a Defaulting Lender's Letter of Credit Usage (including by the termination of the Defaulting Lender status of such Bank) or (y) the Administrative Agent's determination that there exists excess cash collateral, all amounts (or excess portion thereof) remaining in the Letter of Credit Collateral Account shall be promptly returned to the Borrower; provided that the Borrower and the Fronting Bank may agree to continue to hold cash collateral to support future anticipated exposure to a Defaulting Lender's Letter of Credit Usage. Absent such cure or written waiver, any surplus of the funds held in the Letter of Credit Collateral Account and remaining after payment in full of all of the Obligations of the Borrower hereunder and under any other Loan Document after the Maturity Date and cancellation or return of all Letters of Credit shall be paid to the Borrower or to whomsoever may be lawfully entitled to receive such surplus.

THE ADMINISTRATIVE AGENT

Section 71.Appointment and Authorization. Each Bank irrevocably appoints and authorizes the Administrative Agent to take such action as agent on its behalf and to exercise such powers under this Agreement and the other Loan Documents as are delegated to the Administrative Agent by the terms hereof or thereof, together with all such powers as are reasonably incidental thereto. Except as otherwise expressly permitted by this Agreement or with the prior written consent of the Administrative Agent, only the Administrative Agent (and not one or more of the Banks) shall have the authority to deal directly with the Borrower under this Agreement and each Bank acknowledges that all notices, demands or requests from such Bank to Borrower must be forwarded to the Administrative Agent for delivery to the Borrower. Each Bank acknowledges that, except as otherwise expressly set forth in this Agreement, the Borrower has no obligation to act or refrain from acting on instructions or demands of one or more Banks absent written instructions from Administrative Agent in accordance with its rights and authority hereunder.

Section 72.Administrative Agent and Affiliates. JPMorgan Chase Bank, N.A. shall have the same rights and powers under this Agreement as any other Bank and may exercise or refrain from exercising the same as though it were not the Administrative Agent, and JPMorgan Chase Bank, N.A. and its Affiliates may accept deposits from, lend money to, and generally engage in any kind of business with the Borrower or any subsidiary or Affiliate of the Borrower as if it were not the Administrative Agent hereunder, and the term “Bank” and “Banks” shall include JPMorgan Chase Bank, N.A. in its individual capacity.

Section 73.Action by Administrative Agent. (a) The obligations of the Administrative Agent hereunder are only those expressly set forth herein. Without limiting the generality of the foregoing, the Administrative Agent shall not be required to take any action with respect to any Default, except as expressly provided in Article VI. The Administrative Agent shall not have by reason of the execution and delivery of the Loan Documents to which it is a party, the performance of any of its obligations thereunder, or by the use of the term “Administrative Agent”, a fiduciary relationship in respect of any Bank or the Borrower.

(a)The Administrative Agent shall promptly forward, or make available by Intralinks or other internet access system, to each Bank tangible or electronic copies, or notify (in writing or electronically and, if electronically, the Administrative Agent will also transmit a fax indicating that the information in question is being transmitted electronically) each Bank as to the contents, of all notices, financial statements and other significant materials and communications received from the Borrower pursuant to the terms of this Agreement or any other Loan Document and, in the event that the Borrower fails to pay when due the principal of or interest on any Loan, the Administrative Agent shall promptly give notice thereof to the Banks. As to any matters not expressly provided for by the Loan Documents, the Administrative Agent shall not be required to exercise any discretion or take any action, but shall be required to act or to refrain from acting (and shall be fully protected in so acting or refraining from acting) upon the instructions of the Required Banks, and such instructions shall be binding upon all the Banks; provided, however, that the Administrative Agent shall not be required to take any action that exposes the Administrative Agent to personal liability or that is contrary to this Agreement or applicable law. If the Borrower shall have made any payment of principal of and interest on the Loans or any other amount due hereunder in accordance with Article II hereof and the Administrative Agent shall not have distributed to each Bank its proper share of such payment on the date on which such payment shall be received (other than as a result of any shutdown of or disturbance in any payment system or any other event or circumstance beyond the reasonable control of the Administrative Agent), then the Administrative Agent shall pay such proper share to such Bank together with interest thereon at the Federal Funds Rate for each day from the date such payment shall have been received from the Borrower until the date such amount is paid by the Administrative Agent to such Bank. If any Bank transfers funds to the Administrative Agent in anticipation of the making of a Loan that is subsequently not made, then the Administrative Agent agrees to repay such funds to such Bank upon the receipt of a notice from such Bank requesting the repayment of such funds, together with interest thereon at the Federal Funds Rate for each day from the date which is the day upon which Administrative Agent shall have received a notice from such bank requesting the repayment of such funds until the date such amount is paid by the Administrative Agent to such Bank.

Section 74.Consultation with Experts. The Administrative Agent may consult with legal counsel (who may be counsel for the Borrower), independent public accountants and other experts selected by it and shall not be liable for any action taken or omitted to be taken by it in good faith in accordance with the advice of such counsel, accountants or experts.

Section 75.Liability of Administrative Agent. Neither the Administrative Agent nor any of its Affiliates nor any of their respective directors, officers, agents or employees shall be liable for any action taken or not taken by it in connection herewith (i) with the consent or at the request of the Required Banks or, where required by the terms of this Agreement, all of the Banks, or (ii) in the absence of its own gross negligence or willful misconduct. Except as expressly set forth herein, the Administrative Agent shall not have any duty to disclose, and shall not be liable for the failure to disclose, any information relating to the Borrower or any of its Subsidiaries that is communicated to or obtained by the bank serving as Administrative Agent or any of its Affiliates in any capacity. The Administrative Agent shall be deemed not to have knowledge of any Default (other than a Default under Section 6.1(a) with respect to the payment of principal, interest, facility fees or Letter of Credit Fees) unless and until written notice thereof is given to the Administrative Agent by the Borrower or a Bank. Neither the Administrative Agent nor any of its directors, officers, agents or employees shall be responsible for or have any duty to ascertain, inquire into or verify (i) any statement, warranty or representation made in connection with this Agreement or any borrowing hereunder or the contents of any report or certificate delivered hereunder; (ii) the performance or observance of any of the covenants or agreements of the Borrower; (iii) the satisfaction of any condition specified in Article III, except receipt of items required to be delivered to the Administrative Agent; or (iv) the validity, effectiveness or genuineness of this Agreement, the other Loan Documents or any other instrument or writing furnished in connection herewith. The Administrative Agent shall not incur any liability by acting in reliance upon any notice, consent, certificate, statement, or other writing (which may be sent by electronic means) believed by it in good faith to be genuine or to be signed by the proper party or parties. The Administrative Agent also may rely upon any statement made to it orally or by telephone and believed by it in good faith to be made by the proper Person, and shall not incur any liability for relying thereon.

Section 76.Indemnification. Each Bank shall, ratably in accordance with its Commitment Percentage, indemnify the Administrative Agent, the Fronting Bank, the Swingline Lender, their Affiliates and their respective directors, officers, agents and employees (to the extent not reimbursed by the Borrower) against any cost, expense (including counsel fees and disbursements), claim, demand, action, loss or liability (except such as result from such indemnitees' gross negligence or willful misconduct as finally determined by a court of competent jurisdiction) that such indemnitees may suffer or incur as a result of, or in connection with, the Administrative Agent's capacity as Administrative Agent in connection with this Agreement, the other Loan Documents or any action taken or omitted by such indemnitees in accordance with this Agreement, including any amounts that the Borrower fails to pay under Section 9.3(a).

Section 77.Credit Decision. Each Bank acknowledges that it has, independently and without reliance upon the Administrative Agent or any other Bank, and based on such documents and information as it has deemed appropriate, made its own credit analysis and decision to enter into this Agreement. Each Bank also acknowledges that it will, independently and without reliance upon the Administrative Agent or any other Bank, and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit decisions in taking or not taking any action under this Agreement.

Section 78.Successor Administrative Agent. The Administrative Agent may resign at any time by giving notice thereof to the Banks and the Borrower. In addition, if the Administrative Agent at any time shall have been finally determined to have committed gross negligence or willful misconduct in connection with its performance of its duties as Administrative Agent hereunder or if the Commitment of the Administrative Agent, in its capacity as a Bank, inclusive of participations, shall be less than $10,000,000, then, upon notice from the Required Banks, the Administrative Agent shall resign. Upon any such resignation, the Required Banks shall have the right to appoint a successor Administrative Agent with the consent of the Borrower; provided that the consent of the Borrower shall not be required if an Event of Default shall have occurred and be continuing. If no successor Administrative Agent shall have been so appointed by the Required Banks, and shall have accepted such appointment, within 30 days after the retiring Administrative Agent gives notice of resignation, then the retiring Administrative Agent may, on behalf of the Banks, appoint a successor Administrative Agent, with the reasonable approval of the Borrower provided that no Event of Default shall have occurred and be outstanding, which shall be a commercial bank organized or licensed under the laws of the United States of America or of any State thereof and having a combined capital and surplus of at least $500,000,000, total assets of at least $25,000,000,000 and a long-term senior unsecured indebtedness rating of BBB+ or better by S&P (if rated by S&P) and Baa1 by Moody's (if rated by Moody's). Upon the acceptance of its appointment as the Administrative Agent hereunder by a successor Administrative Agent, such successor Administrative Agent shall thereupon succeed to and become vested with all the rights and duties of the retiring Administrative Agent, and the retiring Administrative Agent shall be discharged from its duties and obligations hereunder first accruing or arising after the effective date of such retirement. After any retiring Administrative Agent's resignation hereunder as Administrative Agent, the provisions of this Article shall inure to its benefit as to any actions taken or omitted to be taken by it while it was the Administrative Agent.

If, at any time during the Term, the Administrative Agent shall no longer have any Commitment or hold outstanding Loans under this Agreement, the Administrative Agent shall give notice of its offer to resign to the Banks and the Borrower. Upon any such offer of resignation, the Required Banks shall have the right to appoint a successor Administrative Agent or to retain the Administrative Agent with the consent of the Borrower; provided that the consent of the Borrower shall not be required if an Event of Default shall have occurred and be continuing.

Section 79.Administrative Agent's Fee. The Borrower shall pay to the Administrative Agent for its own account fees in the amounts and at the times previously agreed upon between the Borrower and the Administrative Agent.

Section 80.Copies of Notices. Administrative Agent shall deliver to each Bank a copy of any notice sent to the Borrower by Administrative Agent in connection with the performance of its duties as Administrative Agent hereunder; and Administrative Agent shall deliver to each Bank a copy of any notice sent to the Administrative Agent by the Borrower in connection with any Default or Event of Default hereunder.

CHANGE IN CIRCUMSTANCES

Section 81.Basis for Determining Interest Rate Inadequate or Unfair. If on or prior to the first day of any Interest Period for any Euro-Dollar Borrowing or Money Market Borrowing:

(a)the Administrative Agent is advised by the Reference Bank that deposits in dollars (in the applicable amounts) are not being offered to the Reference Bank in the relevant market for such Interest Period, or

(b)Banks having 50% or more of the aggregate amount of the affected Loans advise the Administrative Agent that the Adjusted London Interbank Offered Rate as determined by the Administrative Agent will not adequately and fairly reflect the cost to such Banks of funding their Euro-Dollar Loans for such Interest Period, the Administrative Agent shall forthwith give notice thereof to the Borrower and the Banks, whereupon until the Administrative Agent notifies the Borrower that the circumstances giving rise to such suspension no longer exist, the obligations of the Banks to make Euro-Dollar Loans, or to continue or convert outstanding Loans as or into Euro-Dollar Loans, as the case may be, shall be suspended, and each outstanding Euro-Dollar Loan shall be converted into a Base Rate Loan on the last day of the then current Interest Period applicable thereto. Unless the Borrower notifies the Administrative Agent at least two Domestic Business Days before the date of any Euro-Dollar Borrowing or Money Market LIBOR Borrowing for which a Notice of Borrowing has previously been given that it elects not to borrow on such date, (i) if such Borrowing is a Committed Borrowing, such Borrowing shall instead be made as a Base Rate Borrowing, and (ii) if such Borrowing is a Money Market LIBOR Borrowing, the Money Market LIBOR Loans comprising such Borrowing shall bear interest for each day from and including the first day to but excluding the last day of the Interest Period applicable thereto at the Base Rate for such day.

Section 82.Illegality. If, after the date of this Agreement, the adoption of any applicable law, rule or regulation, or any change in any existing applicable law, rule or regulation, or any change in the interpretation or administration thereof by any governmental authority, central bank or comparable agency charged with the interpretation or administration thereof, or compliance by any Bank (or its Euro-Dollar Lending Office) with any request or directive (whether or not having the force of law) of any such authority, central bank or comparable agency shall make it unlawful or impossible for any Bank (or its Euro-Dollar Lending Office) to make, maintain or fund its Euro-Dollar Loans or Money Market Loans or to participate

in any Letter of Credit issued by the Fronting Bank, or, with respect to the Fronting Bank, to issue any Letter of Credit, and such Bank shall so notify the Administrative Agent, the Administrative Agent shall forthwith give notice thereof to the other Banks and the Borrower, whereupon until such Bank notifies the Borrower and the Administrative Agent that the circumstances giving rise to such suspension no longer exist, the obligation of such Bank to make or convert Euro-Dollar Loans or Money Market Loans, or to participate in any Letter of Credit issued by the Fronting Bank or, with respect to the Fronting Bank, to issue any Letter of Credit, shall be suspended. Before giving any notice to the Administrative Agent pursuant to this Section, such Bank shall designate a different Euro-Dollar Lending Office if such designation will avoid the need for giving such notice and will not, in the judgment of such Bank, be otherwise disadvantageous to such Bank. If such Bank shall determine that it may not lawfully continue to maintain and fund any of its outstanding Euro-Dollar Loans or Money Market Loans (as the case may be) to maturity and shall so specify in such notice, the Borrower shall immediately prepay in full the then outstanding principal amount of each such Euro-Dollar Loan or Money Market Loan, together with accrued interest thereon. Concurrently with prepaying each such Euro-Dollar Loan, the Borrower shall borrow a Base Rate Loan in an equal principal amount from such Bank (on which interest and principal shall be payable contemporaneously with the related Euro-Dollar Loans or Money Market Loans of the other Banks), and such Bank shall make such a Base Rate Loan.

Section 83.Increased Cost and Reduced Return.

(a)If, after (x) the date hereof, in the case of any Committed Loan or any obligation to make Committed Loans or (y) the date of the related Money Market Quote, in the case of any Money Market Loan, the adoption of any applicable law, rule or regulation, or any change in any applicable law, rule, directive, decision or regulation, or any change in the interpretation, re-interpretation, application or administration thereof by any governmental authority, central bank or comparable agency charged with the interpretation or administration thereof (“Change of Law”), or compliance by any Bank (or its Applicable Lending Office) with any request, decision or directive (whether or not having the force of law) of any such authority, central bank or comparable agency shall impose, modify or deem applicable any reserve (including, without limitation, any such requirement imposed by the Board of Governors of the Federal Reserve System (but excluding with respect to any Euro-Dollar Loan any such requirement reflected in an applicable Euro-Dollar Reserve Percentage)), special deposit, insurance assessment or similar requirement against assets of, deposits with or for the account of, or credit extended by, any Bank (or its Applicable Lending Office) or shall impose on any Bank (or its Applicable Lending Office) or on the London interbank market any other condition affecting its Euro-Dollar Loans or Money Market LIBOR Loans, its Note, or its obligation to make Euro-Dollar Loans, and the result of any of the foregoing is to increase the cost to such Bank (or its Applicable Lending Office) of making or maintaining any Euro-Dollar Loan, or to reduce the amount of any sum received or receivable by such Bank (or its Applicable Lending Office) under this Agreement or under its Note with respect thereto, by an amount deemed by such Bank to be material, then, within 15 days after demand by such Bank (with a copy to the Administrative Agent), which demand shall be accompanied by a certificate showing, in reasonable detail, the calculation of such amount or amounts, the Borrower shall pay to such Bank such additional amount or amounts as will compensate such Bank for such increased cost or reduction. For purposes hereof, all requests, rules, guidelines or directives in connection with the Dodd-Frank Wall Street Reform and Consumer Protection Act shall be deemed to be a change after the date hereof or after the date of the related Money Market Quote, as applicable, regardless of the date enacted, adopted or issued and all requests, rules, guidelines or directives promulgated by the Bank for International Settlements, the Basel Committee on Banking Regulations and Supervisory Practices (or any successor or similar authority) or the United States financial regulatory authorities shall be deemed to be such a change regardless of the date adopted, issued, promulgated or implemented (each a “Regulatory Change”), provided, however, that if the applicable Bank shall have implemented changes prior to the Closing Date in response to any such requests, rules, guidelines or directives, then the same shall not be deemed to be a change after the date hereof or after the date of the related Money Market Quote, as applicable, with respect to such Bank.

(b)If any Bank shall have determined that, after the date hereof, the adoption of any applicable law, rule or regulation regarding capital or liquidity requirements, or any change in any such law, rule or regulation, or any change in the interpretation or administration thereof by any governmental authority, central bank or comparable agency charged with the interpretation or administration thereof, or any request or directive regarding capital or liquidity requirements (whether or not having the force of law) of any such authority, central bank or comparable agency, including any Regulatory Change, has or would have the effect of reducing the rate of return on capital of such Bank (or its Parent) as a consequence of such Bank's obligations hereunder to a level below that which such Bank (or its Parent) could have achieved but for such adoption, change, request or directive (taking into consideration its policies with respect to capital or liquidity requirements) by an amount deemed by such Bank to be material, then from time to time, within 15 days after demand by such Bank (with a copy to the Administrative Agent), which demand shall be accompanied by a certificate showing, in reasonable detail, the calculation of such amount or amounts, the Borrower shall pay to such Bank such additional amount or amounts as will compensate such Bank (or its Parent) for such reduction.

(c)Each Bank will promptly notify the Borrower and the Administrative Agent of any event of which it has knowledge, occurring after the date hereof, which will entitle such Bank to compensation pursuant to this Section (although failure or delay on the part of any Bank to provide such notice or to demand compensation pursuant to this Section, after receiving notice of increased cost or reduced rate of return, shall not constitute a waiver of such Bank's right to demand such compensation unless such failure materially prejudices Borrower's rights hereunder) and will designate a different Applicable

Lending Office if such designation will avoid the need for, or reduce the amount of, such compensation and will not, in the judgment of such Bank, be otherwise disadvantageous to such Bank. A certificate of any Bank claiming compensation under this Section and setting forth the additional amount or amounts to be paid to it hereunder shall be conclusive in the absence of manifest error. In determining such amount, such Bank may use any reasonable averaging and attribution methods.

Section 84.Taxes.

(a)Any and all payments by the Borrower to or for the account of any Bank or the Administrative Agent hereunder or under any other Loan Document shall be made free and clear of and without deduction for any and all present or future taxes, duties, levies, imposts, deductions, charges or withholdings, and all liabilities, including, without limitation, penalties, interest and expenses, with respect thereto, excluding, (i) in the case of each Bank and the Administrative Agent, taxes imposed on its net income (however denominated), franchise taxes and branch profits taxes, in each case (a) imposed on it, by the jurisdiction under the laws of which such Bank or the Administrative Agent (as the case may be) is organized, or in which it has its principal office or any political subdivision thereof, or (b) that are Other Connection Taxes, (ii) in the case of each Bank, taxes imposed on its net income (however denominated), and franchise or similar taxes imposed on it, by the jurisdiction of such Bank's Applicable Lending Office or any political subdivision thereof (and, if different from the jurisdiction of such Bank's Applicable Lending Office, the jurisdiction of the domicile of its Loans either established by the Bank pursuant to Section 9.14 or determined by the applicable taxing authorities), and (iii) any U.S. federal withholding taxes imposed under FATCA (all such non-excluded taxes, duties, levies, imposts, deductions, charges, withholdings and liabilities being hereinafter referred to as “Taxes”). If the Borrower shall be required by law to deduct any Taxes from or in respect of any sum payable hereunder or under any Note or Letter of Credit or participation therein to any Bank or the Administrative Agent, (i) the sum payable shall be increased as necessary so that after making all required deductions (including deductions applicable to additional sums payable under this Section 8.4) such Bank or the Administrative Agent (as the case may be) receives an amount equal to the sum it would have received had no such deductions been made, (ii) the Borrower shall make such deductions, (iii) the Borrower shall pay the full amount deducted to the relevant taxation authority or other authority in accordance with applicable law and (iv) the Borrower shall furnish to the Administrative Agent, at its address referred to in Section 9.1, the original or a certified copy of a receipt evidencing payment thereof.

(b)In addition, the Borrower agrees to pay any present or future stamp, court or documentary, intangible, recording, filing or similar taxes, or charges or similar levies which arise from any payment made hereunder or under any Note or Letter of Credit or participation therein or from the execution, delivery, performance, enforcement or registration of, or otherwise with respect to, this Agreement or any Note or Letter of Credit or participation therein (hereinafter referred to as “Other Taxes”).

(c)The Borrower agrees to indemnify each Bank and the Administrative Agent for the full amount of Taxes or Other Taxes (including, without limitation, any Taxes or Other Taxes imposed on amounts payable under this Section 8.4) payable or paid by such Bank or the Administrative Agent (as the case may be) or required to be deducted from a payment to such Bank or Administrative Agent and any liability (including penalties, interest and expenses) arising therefrom or with respect thereto (whether or not such Taxes or Other Taxes were correctly or legally imposed or asserted by the relevant Governmental Authority). A certificate as to the amount of such payment or liability delivered to the Borrower by a Bank (with a copy to the Administrative Agent), or by the Administrative Agent on its own behalf or on behalf of a Bank, shall be conclusive absent manifest error. Any payment required under this indemnification shall be made within 15 days from the date such Bank or the Administrative Agent (as the case may be) makes written demand therefor. The Administrative Agent shall reasonably cooperate, at no cost to the Administrative Agent or the Banks, with efforts by Borrower to recover any Taxes or Other Taxes which Borrower reasonably believes were incorrectly or illegally imposed.

(d)(i) Any Bank that is entitled to an exemption from or reduction of withholding Tax with respect to payments made under any Loan Document shall deliver to the Borrower and the Administrative Agent, at the time or times reasonably requested by the Borrower or the Administrative Agent, such properly completed and executed documentation reasonably requested by the Borrower or the Administrative Agent as will permit such payments to be made without withholding or at a reduced rate of withholding. In addition, any Bank, if reasonably requested by the Borrower or the Administrative Agent, shall deliver such other documentation prescribed by applicable law or reasonably requested by the Borrower or the Administrative Agent as will enable the Borrower or the Administrative Agent to determine whether or not such Bank is subject to backup withholding or information reporting requirements. Notwithstanding anything to the contrary in the preceding two sentences, the completion, execution and submission of such documentation (other than such documentation set forth in Section 8.4(d)(ii)(1), (ii)(2) and (ii)(3) below) shall not be required if in the Bank's reasonable judgment such completion, execution or submission would subject such Bank to any material unreimbursed cost or expense or would materially prejudice the legal or commercial position of such Bank.

(ii)    Without limiting the generality of the foregoing,

(1)    Each Bank organized under the laws of the United States shall deliver to the Borrower and the Administrative Agent on or prior to the date on which such Bank becomes a Bank under this Agreement (and from time to time thereafter upon the reasonable request of the Borrower or the

Administrative Agent), executed originals of IRS Form W-9 certifying that such Bank is exempt from U.S. federal backup withholding tax.

(2)    Each Bank organized under the laws of a jurisdiction outside the United States, on or prior to the date of its execution and delivery of this Agreement in the case of each Bank listed on the signature pages hereof and on or prior to the date on which it becomes a Bank in the case of each other Bank, and from time to time thereafter if requested in writing by the Borrower (but only so long as such Bank remains lawfully able to do so), shall provide the Borrower and the Administrative Agent with whichever of the following is applicable:

(A)    If such Bank is claiming the benefits of an income tax treaty to which the United States is a party (x) with respect to payments of interest under any Loan Document, executed originals of IRS Form W-8BEN establishing an exemption from, or reduction of, United States federal withholding Tax pursuant to the “interest” article of such tax treaty and (y) with respect to any other applicable payments under any Loan Document, IRS Form W-8BEN establishing an exemption from, or reduction of, United States federal withholding Tax pursuant to the “business profits” or “other income” article of such tax treaty;

(B)    Executed originals of IRS Form W-8ECI;

(C)    if such Bank is claiming the benefits of the exemption for portfolio interest under Section 881(c) of the Internal Revenue Code, (x) a certificate reasonably acceptable to Bank and the Borrower that such Bank is not a “bank” within the meaning of Section 881(c)(3)(A) of the Internal Revenue Code, a “10 percent shareholder” of the Borrower within the meaning of Section 881(c)(3)(B) of the Internal Revenue Code, or a “controlled foreign corporation” described in Section 881(c)(3)(C) of the Internal Revenue Code (a “U.S. Tax Compliance Certificate”) and (y) executed originals of IRS Form W-8BEN; or

(D)    to the extent such Bank is not the beneficial owner, executed originals of IRS Form W-8IMY, accompanied by IRS Form W-8ECI, IRS Form W-8BEN, a U.S. Tax Compliance Certificate, IRS Form W-9, and/or other certification documents from each beneficial owner, as applicable; provided that if such Bank is a partnership and one or more direct or indirect partners of such Bank are claiming the portfolio interest exemption, such Bank may provide a U.S. Tax Compliance Certificate on behalf of each such direct and indirect partner;

(3)    if a payment made to a Bank under any Loan Document would be subject to United States federal withholding Tax imposed by FATCA if such Bank were to fail to comply with the applicable reporting requirements of FATCA (including those contained in Section 1471(b) or 1472(b) of the Internal Revenue Code, as applicable), such Bank shall deliver to the Borrower and the Administrative Agent at the time or times prescribed by law and at such time or times reasonably requested by the Borrower or the Administrative Agent such documentation prescribed by applicable law (including as prescribed by Section 1471(b)(3)(C)(i) of the Internal Revenue Code) and such additional documentation reasonably requested by the Borrower or the Administrative Agent as may be necessary for the Borrower and the Administrative Agent to comply with their obligations under FATCA and to determine that such Bank has complied with such Bank's obligations under FATCA or to determine the amount to deduct and withhold from such payment. Solely for purposes of this clause (3), “FATCA” shall include any amendments made to FATCA after the date of this Agreement.

U.S. federal withholding taxes imposed on amounts payable to or for the account of a Bank with respect to an applicable interest in a Loan pursuant to a law in effect on the date on which (1) such Bank acquires such interest in the Loan (other than pursuant to an assignment request by the Borrower under Section 8.7) or (2) such Bank changes its lending office, except in each case to the extent that, pursuant to Section 8.4(a), amounts with respect to such taxes were payable either to such Bank's assignor immediately before such Bank became a party hereto or to such Bank immediately before it changed its lending office shall be considered excluded from “Taxes” as defined in Section 8.4(a).

(iii)    For purposes of this Section 8.4(d) and (e), the term “Bank” includes the Administrative Agent.

(e)For any period with respect to which a Bank has failed to comply with Section 8.4(d) (unless such failure is due to a change in treaty, law or regulation occurring subsequent to the date on which a form originally was required to be provided), such Bank shall not be entitled to indemnification under Section 8.4(a) with respect to Taxes imposed by the United States and attributable to such failure to comply; provided, however, that should a Bank, which is otherwise exempt from or subject to a reduced rate of withholding tax, become subject to Taxes because of its failure to deliver a form required hereunder, the Borrower shall take such steps as such Bank shall reasonably request to assist such Bank to recover such Taxes.

(f)If the Borrower is required to pay additional amounts to or for the account of any Bank pursuant to this Section 8.4, then such Bank will change the jurisdiction of its Applicable Lending Office so as to eliminate or reduce any such additional payment which may thereafter accrue if such change, in the judgment of such Bank, is not otherwise disadvantageous to such Bank.

(g)If any party determines, in its sole discretion exercised in good faith, that it has received a refund of any Taxes or Other Taxes as to which it has been indemnified pursuant to this Section 8.4 (including by the payment of additional amounts pursuant to this Section 8.4), it shall pay to the Borrower an amount equal to such refund (but only to the extent of indemnity payments made under this Section with respect to the Taxes or Other Taxes giving rise to such refund), net of all out-of-pocket expenses (including Taxes or Other Taxes) of such indemnified party and without interest (other than any interest paid by the relevant Governmental Authority with respect to such refund). Such indemnifying party, upon the request of such indemnified party, shall repay to such indemnified party the amount paid over pursuant to this paragraph (g) (plus any penalties, interest or other charges imposed by the relevant Governmental Authority) in the event that such indemnified party is required to repay such refund to such Governmental Authority. Notwithstanding anything to the contrary in this paragraph (g), in no event will the indemnified party be required to pay any amount to an indemnifying party pursuant to this paragraph (g) the payment of which would place the indemnified party in a less favorable net after-Tax position than the indemnified party would have been in if the indemnification payments or additional amounts giving rise to such refund had never been paid or if the refund results from tax attributes unrelated to the event giving rise to the indemnity payment. This paragraph shall not be construed to require any indemnified party to make available its Tax returns (or any other information relating to its Taxes that it deems confidential) to the indemnifying party or any other Person.

(h)    For purposes of this Section 8.4, the term “Bank” includes any Fronting Bank and the term “applicable law” includes FATCA.

Section 85.Base Rate Loans Substituted for Affected Euro-Dollar Loans. If (i) the obligation of any Bank to make, or convert outstanding Loans to, Euro-Dollar Loans has been suspended pursuant to Sections 8.1 or 8.2 or (ii) any Bank has demanded compensation under Section 8.3 or 8.4 with respect to its Euro-Dollar Loans and the Borrower shall, by at least five (5) Euro-Dollar Business Days' prior notice to such Bank through the Administrative Agent, have elected that the provisions of this Section shall apply to such Bank, then, unless and until such Bank notifies the Borrower that the circumstances giving rise to such suspension or demand for compensation no longer exist:

(a)all Loans which would otherwise be made by such Bank as Euro-Dollar Loans shall be made instead as Base Rate Loans (on which interest and principal shall be payable contemporaneously with the related Euro-Dollar Loans of the other Banks), and

(b)after each of its Euro-Dollar Loans has been repaid, all payments of principal which would otherwise be applied to repay such Euro-Dollar Loans shall be applied to repay its Base Rate Loans instead.

Section 86.SPC Loans. Notwithstanding anything to the contrary contained herein, any Bank (a “Granting Bank”) may grant to one special purpose funding vehicle (a “SPC”) sponsored by such Granting Bank, as identified as such in writing by such Granting Bank to the Administrative Agent and the Borrower from time to time (including, without limitation, by the execution of this Agreement on the date hereof by a Granting Bank and its SPC identified as such on the signature pages hereof), the option to provide to the Borrower all or any part of any Loan that such Granting Bank would otherwise be obligated to make to the Borrower pursuant to the terms hereof; provided, that (i) nothing herein shall constitute a commitment to make any Loan by any SPC, and (ii) if an SPC elects not to exercise such option or otherwise fails to provide all or any part of such Loan, the Granting Bank shall be obligated to make such Loan pursuant to the terms hereof. The making of a Loan by an SPC hereunder shall utilize the Commitment of such Granting Bank to the same extent, and as if, such Loan were made by such Granting Bank. Any SPC that makes a Loan shall (i) have in regard to such Loan all of the rights (exercisable, however, only through its Granting Bank acting as its agent) that such Granting Bank would have had if it had made such Loan directly, and (ii) comply with this Agreement in regard to such Loan on the same terms as any other Bank party hereto; provided that (A) the Granting Bank's Commitment shall remain the Commitment of such Granting Bank, and (B) all monetary obligations of an SPC hereunder in respect of any Loan it provides shall remain the obligations of such Granting Bank to the extent at any time that such SPC elects not to or otherwise fails to perform or pay any such obligation. Each party

hereto hereby agrees that no SPC shall be liable for any payment under this Agreement for which a Bank would otherwise be liable for so long as, and to the extent, its sponsoring Granting Bank makes such payment. Notwithstanding any Loan that may be provided by an SPC hereunder, the Administrative Agent and Borrower shall be entitled to continue to communicate and deal solely and directly with the Granting Bank in accordance with this Agreement in respect of such Loan. Each SPC that is a signatory hereto, and each SPC that subsequently is identified by its Granting Bank as having been granted such option, shall be deemed to have confirmed (and the Borrower and the Administrative Agent may require a written acknowledgment of such confirmation signed by any SPC not a signatory hereto that is subsequently so identified by its Granting Bank) to the Borrower and the Administrative Agent that (a) it has received a copy of the Agreement and each Loan Document, together with copies of the financial statements heretofore provided to the Banks under the terms of this Agreement and such other documents and information as it has deemed appropriate to make its own credit analysis and decision to enter into this Agreement; (b) agrees that it will independently and without reliance upon the Administrative Agent, its Granting Bank or any other Bank, and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit decisions in taking or not taking action under the Agreement and any other Loan Document; (c) appoints and authorizes the Administrative Agent to take such action as agent on its behalf and to exercise such powers and discretion under this Agreement and any other Loan Document as are delegated to the Administrative Agent by the terms thereof, together with such powers and discretion as are reasonably incidental thereto; (d) agrees that it will perform in accordance with their terms all of the obligations which by the terms of this Agreement and any other Loan Document are required to be performed by it as a Bank, subject to the terms of this Section 8.6; and (e) appoints its Granting Bank, or a specified branch or Affiliate thereof, as its agent and attorney in fact and grants to its Granting Bank an irrevocable power of attorney to receive payments made for the benefit such SPC under this Agreement, to deliver and receive all communications and notices under this Agreement and other Loan Documents and to exercise on such SPC's behalf all rights to vote and to grant and make approvals, waivers, consents of amendments to or under this Agreement and other Loan Documents. Any document executed by such agent on such SPC's behalf in connection with this Agreement or other Loan Documents shall be binding on such SPC. In furtherance of the foregoing, all the Banks and the Administrative Agent each hereby agrees (which agreement shall survive the termination of this Agreement) that, prior to the date that is one (1) year and one (1) day after the payment in full of all outstanding commercial paper or other senior indebtedness of any SPC, it will not institute against, or join any other person in instituting against, such SPC any bankruptcy, reorganization, arrangement, insolvency or liquidation proceedings or similar proceedings under the laws of the United States or any State thereof. In addition, notwithstanding anything to the contrary contained in Section 9.6(c), any SPC may (i) with notice to, but without the prior written consent of, the Borrower or Administrative Agent, and without the payment of any processing fee therefor, assign all or a portion of its interests in any Loans to its Granting Bank or to any financial institutions consented to by the Borrower and the Administrative Agent (and, subject to all of the provisions of this paragraph, such consents shall be deemed to have been granted with respect to any SPC signatory hereto on the date hereof) providing liquidity and/or credit facilities to or for the account of such SPC to support the funding or maintenance of loans, and (ii) disclose on a confidential basis any non-public information relating to its Loans to any rating agency, commercial paper dealer or provider of liquidity and/or credit facilities to such SPC. Nothing in this Section 8.6 that would affect the rights or obligations of an SPC may be amended without the written consent of any SPC that has any Loan outstanding at the time of such amendment.

Section 87.Mitigation Obligations; Replacement of Lenders. (a) If any Bank requests compensation under Section 8.3, or if the Borrower is required to pay any additional amount to any Bank or any Governmental Authority for the account of any Bank pursuant to Section 8.4, then such Bank shall use reasonable efforts to designate a different lending office for funding or booking its Loans hereunder or to assign its rights and obligations hereunder to another of its offices, branches or Affiliates, if, in the judgment of such Bank, such designation or assignment (i) would eliminate or reduce amounts payable pursuant to Section 8.3 or 8.4, as the case may be, in the future and (ii) would not subject such Bank to any unreimbursed cost or expense and would not otherwise be disadvantageous to such Bank. The Borrower hereby agrees to pay all reasonable costs and expenses incurred by any Bank in connection with any such designation or assignment.

(b)    If (w) any Bank is unable to make, maintain or fund its Eurodollar Loans or to participate in any Letter of Credit pursuant to Section 8.2 for a period of ten (10) consecutive days, or (x) any Bank requests compensation under Section 8.3, or if the Borrower is required to pay any additional amount to any Bank or any Governmental Authority for the account of any Bank pursuant to Section 8.4, or (y) if any Bank becomes a Defaulting Lender, or (z) any Bank has refused to consent to any proposed amendment, modification, waiver, termination or consent with respect to any provision of this Agreement or any other Loan Document that, pursuant to Section 9.5, requires the consent of all Banks or of all Banks affected thereby and with respect to which Banks constituting the Required Banks have consented to such proposed amendment, modification, waiver, termination or consent, then the Borrower may, at its sole expense and effort, upon notice to such Bank and the Administrative Agent, require such Bank to assign and delegate, without recourse (in accordance with and subject to the restrictions contained in Section 9.6), all its interests, rights and obligations under this Agreement (other than any outstanding Money Market Loans held by it) to an assignee that shall assume such obligations (which assignee may be another Bank, if a Bank accepts such assignment); provided that (i) the Borrower shall have received the prior written consent of the Administrative Agent (and if a Commitment is being assigned, the Fronting Bank and the Swingline Lender), which consent shall not unreasonably be withheld or delayed (provided that no such consent shall be required for an assignment to any Bank so long as, after giving effect to such assignment, such Bank's Commitment Percentage does not exceed 25%), (ii) such Bank

shall have received payment of an amount equal to the outstanding principal of its Loans (other than Money Market Loans) and participations in Unreimbursed Obligations and Swingline Loans, accrued interest thereon, accrued fees and all other amounts payable to it hereunder, from the assignee (to the extent of such outstanding principal and accrued interest and fees) or the Borrower (in the case of all other amounts), (iii) in the case of any such assignment resulting from a claim for compensation under Section 8.3 or payments required to be made pursuant to Section 8.4, such assignment will result in a reduction in such compensation or payments and (iv) in the case of any such assignment resulting from a Bank's refusal to consent to a proposed amendment, modification, waiver, termination or consent, the assignee shall approve the proposed amendment, modification, waiver, termination or consent. A Bank shall not be required to make any such assignment and delegation if, prior thereto, as a result of a waiver by such Bank or otherwise, the circumstances entitling the Borrower to require such assignment and delegation cease to apply.

MISCELLANEOUS

Section 88.Notices. All notices, requests and other communications to any party hereunder shall be in writing (including bank wire, telex, facsimile transmission or similar writing) and shall be given to such party: (x) in the case of the Borrower or the Administrative Agent, at its address or telecopy number set forth on the signature pages hereof, together with copies thereof, in the case of the Borrower, to Latham & Watkins LLP, 355 S. Grand Avenue, Los Angeles, CA 90071, Attention: Glen B. Collyer, Esq., Telephone: (213) 485-1234, Telecopy: (213) 891-8763, and in the case of the Administrative Agent, to JPMorgan Chase Bank, N.A., 500 Stanton Christiana Road, Ops 2, Newark, DE 19713, Attention: Brittany Duffy, Telephone: (302) 634-8814, Telecopy number: (302) 634-4733, with a copy to: JPMorgan Chase Bank, N.A., 383 Madison Avenue, Floor 24, New York, NY 10179, Attention: Nadeige Charles, Telephone: (212) 622-4522, Telecopy number: (212) 270-2157, and to Bingham McCutchen LLP, One Federal Street, Boston, Massachusetts 02110, Attention: Stephen Miklus, Esq., Telephone: (617) 951-8364, Telecopy: (617) 951-8736, (y) in the case of any Bank, at its address or telecopy number set forth on the signature pages hereof or in its Administrative Questionnaire, or (z) in the case of any party, such other address or telecopy number as such party may hereafter specify for the purpose by notice to the Administrative Agent, the Banks and the Borrower. Each such notice, request or other communication shall be effective (i) if given by telecopy, when such telecopy is transmitted to the telecopy number specified in this Section, (ii) if given by mail, 72 hours after such communication is deposited in the mails with first class postage prepaid, addressed as aforesaid or (iii) if given by any other means, when delivered at the address specified in this Section; provided that notices to the Administrative Agent under Article II or Article VIII shall not be effective until received.

Notices and other communications to the Banks hereunder may be delivered or furnished by electronic communications pursuant to procedures approved by the Administrative Agent; provided that the foregoing shall not apply to notices pursuant to Article II unless otherwise agreed by the Administrative Agent and the applicable Bank. The Administrative Agent or the Borrower may, in its discretion, agree to accept notices and other communications to it hereunder by electronic communications pursuant to procedures approved by it; provided that approval of such procedures may be limited to particular notices or communications.

Section 89.No Waivers. No failure or delay by the Administrative Agent or any Bank in exercising any right, power or privilege hereunder or under any Note shall operate as a waiver thereof nor shall any single or partial exercise thereof preclude any other or further exercise thereof or the exercise of any other right, power or privilege. The rights and remedies herein provided shall be cumulative and not exclusive of any rights or remedies provided by law.

Section 90.Expenses; Indemnification. (a) The Borrower shall pay (i) all reasonable out-of-pocket expenses of the Administrative Agent (including, without limitation, reasonable fees and disbursements of special counsel to the Administrative Agent, local counsel for the Administrative Agent, and travel, site visits, third party reports (including Appraisals), mortgage recording taxes, environmental and engineering expenses), in connection with the preparation and administration of this Agreement, the Loan Documents and the documents and instruments referred to therein, the syndication of the Loans, any waiver or consent hereunder or any amendment or modification hereof or any Default or alleged Default hereunder, (ii) the customary issuance, presentation, amendment and other processing fees, and other standard costs and charges, of the Fronting Bank relating to Letters of Credit as from time to time in effect and (iii) if an Event of Default occurs, all out-of-pocket expenses incurred by the Administrative Agent and each Bank, including, without limitation, reasonable fees and disbursements of counsel for the Administrative Agent, in connection with the enforcement of the Loan Documents and the instruments referred to therein and such Event of Default and collection, bankruptcy, insolvency and other enforcement proceedings resulting therefrom, including all such expenses incurred during any workout or restructuring.

(a)The Borrower agrees to indemnify the Administrative Agent, the Fronting Bank, and each Bank, their respective Affiliates and the respective directors, officers, agents and employees of the foregoing (each an “Indemnitee”) and hold each Indemnitee harmless from and against any and all liabilities, losses, damages, costs and expenses of any kind, including, without limitation, the reasonable fees and disbursements of counsel and settlements and settlement costs, which may be incurred by such Indemnitee in connection with any investigative, administrative or judicial proceeding (whether or not such Indemnitee shall be designated a party thereto) and whether or not brought by the Borrower, the General Partner or any

Affiliate of the Borrower, that may at any time (including, without limitation, at any time following the payment of the Obligations) be imposed on, asserted against or incurred by any Indemnitee as a result of, or arising out of, or in any way related to or by reason of, (i) any of the transactions contemplated by the Loan Documents or the execution, delivery or performance of any Loan Document (including, without limitation, the Borrower's actual or proposed use of proceeds of the Loans, whether or not in compliance with the provisions hereof), (ii) any violation by the Borrower or the Environmental Affiliates of any applicable Environmental Law, (iii) any Environmental Claim arising out of the management, use, control, ownership or operation of property or assets by the Borrower or any of the Environmental Affiliates, including, without limitation, all on-site and off-site activities involving Material of Environmental Concern, (iv) the breach of any environmental representation or warranty set forth herein, (v) the grant to the Administrative Agent and the Banks of any Lien in any property or assets of the Borrower or any stock or other equity interest in the Borrower, and (vi) the exercise by the Administrative Agent and the Banks of their rights and remedies (including, without limitation, foreclosure) under any agreements creating any such Lien (but excluding in each case, as to any Indemnitee, any such losses, liabilities, claims, damages, expenses, obligations, penalties, actions, judgments, suits, costs or disbursements incurred solely by reason of (y) the gross negligence or willful misconduct of such Indemnitee as finally determined by a court of competent jurisdiction or (z) any investigative, administrative or judicial proceeding imposed or asserted against any Indemnitee by any bank regulatory agency or by any equity holder of such Indemnitee). The Borrower's obligations under this Section shall survive the termination of this Agreement and the payment of the Obligations.

(b)The Borrower shall pay, and hold the Administrative Agent and each of the Banks harmless from and against, any and all present and future U.S. stamp, recording, transfer and other similar foreclosure related taxes with respect to the foregoing matters and hold the Administrative Agent and each Bank harmless from and against any and all liabilities with respect to or resulting from any delay or omission (other than to the extent attributable to such Bank) to pay such taxes.

Section 91.Sharing of Set-Offs. In addition to any rights now or hereafter granted under applicable law or otherwise, and not by way of limitation of any such rights, upon the occurrence and during the continuance of any Event of Default, each Bank is hereby authorized at any time or from time to time, without presentment, demand, protest or other notice of any kind to the Borrower or to any other Person, any such notice being hereby expressly waived, to set off and to appropriate and apply any and all deposits (general or special, time or demand, provisional or final), other than deposits held for the benefit of third parties, and any other indebtedness at any time held or owing by such Bank (including, without limitation, by branches and agencies of such Bank wherever located) to or for the credit or the account of the Borrower against and on account of the Obligations of the Borrower then due and payable to such Bank under this Agreement or under any of the other Loan Documents, including, without limitation, all interests in Obligations purchased by such Bank. Each Bank agrees that if it shall, by exercising any right of set-off or counterclaim or otherwise, receive payment of a proportion of the aggregate amount of principal and interest due with respect to any Note held by it or Letter of Credit participated in by it, or, in the case of the Fronting Bank, Letter of Credit issued by it, which is greater than the proportion received by any other Bank or Letter of Credit issued or participated in by such other Bank, in respect of the aggregate amount of principal and interest due with respect to any Note held by such other Bank, the Bank receiving such proportionately greater payment shall purchase such participations in the Notes held by the other Banks or Letter of Credit issued or participated in by such other Bank, and such other adjustments shall be made, as may be required so that all such payments of principal and interest with respect to the Notes held by the Banks or Letter of Credit issued or participated in by such other Banks shall be shared by the Banks pro rata; provided that (x) nothing in this Section shall impair the right of any Bank to exercise any right of set-off or counterclaim it may have and to apply the amount subject to such exercise to the payment of indebtedness of the Borrower other than its indebtedness under the Notes or the Letters of Credit and (y) the provisions of this Section shall not be construed to apply to any payment made by the Borrower pursuant to and in accordance with the express terms of this Agreement or any payment obtained by a Bank as consideration for the assignment of or sale of a participation in any of its Loans or Commitments to any assignee or participant. The Borrower agrees, to the fullest extent that it may effectively do so under applicable law, that any holder of a participation in a Note, whether or not acquired pursuant to the foregoing arrangements, may exercise rights of set-off or counterclaim and other rights with respect to such participation as fully as if such holder of a participation were a direct creditor of the Borrower in the amount of such participation.

Section 92.Amendments and Waivers. Any provision of this Agreement (including any of the financial covenants given by the Borrower pursuant to Section 5.8), the Notes, the Letters of Credit or other Loan Documents may be amended or waived if, but only if, such amendment or waiver is in writing and is signed by the Borrower and the Required Banks (and, if the rights or duties of the Administrative Agent, the Fronting Bank or the Swingline Lender are affected thereby, by the Administrative Agent, the Fronting Bank or the Swingline Lender, as applicable); provided that no such amendment or waiver shall (a) increase the Commitment of any Bank, unless signed by such Bank, or (b) unless signed by all the Banks, (i) increase or decrease the Commitment of any Bank (except for a ratable decrease in the Commitments of all Banks and except as contemplated in the definition of the term “Loan Amount”) or increase the aggregate Commitments above $700,000,000, (ii) reduce the principal of or rate of interest on any Loan or any fees specified herein, (iii) postpone the date fixed for any payment of principal of or interest on any Loan or any fees hereunder or for any reduction or termination of any Commitment (notwithstanding the foregoing, however, it is agreed that only the consent of the extending Banks shall be required in the case

of a partial “amend and extend”), (iv) release the Guaranty or otherwise release any other collateral, (v) subordinate the Loans to any other Debt, or (vi) change the percentage of the Commitments or of the aggregate unpaid principal amount of the Notes, or the number of Banks, which shall be required for the Banks or any of them to take any action under this Section 9.5 or any other provision of this Agreement. Notwithstanding the foregoing, no amendment, waiver or consent shall, unless in writing and signed by the Designating Lender on behalf of its Designated Lender affected thereby, (x) subject such Designated Lender to any additional obligations, (y) reduce the principal of, interest on, or other amounts due with respect to, the Designated Lender Note made payable to such Designated Lender, or (z) postpone any date fixed for any payment of principal of, or interest on, or other amounts due with respect to the Designated Lender Note made payable to the Designated Lender.

Section 93.Successors and Assigns. (a) The provisions of this Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective successors and assigns, except that the Borrower may not assign or otherwise transfer any of its rights under this Agreement or the other Loan Documents without the prior written consent of all Banks (and any attempted assignment or transfer by the Borrower without such consent shall be void).

(a)Any Bank may at any time grant to one or more banks or other entities, other than the Borrower and its Affiliates (each a “Participant”) participating interests in its Commitment or any or all of its Loans. In the event of any such grant by a Bank of a participating interest to a Participant, whether or not upon notice to the Borrower and the Administrative Agent, such Bank shall remain responsible for the performance of its obligations hereunder, and the Borrower and the Administrative Agent shall continue to deal solely and directly with such Bank in connection with such Bank's rights and obligations under this Agreement. Any agreement pursuant to which any Bank may grant such a participating interest shall provide that such Bank shall retain the sole right and responsibility to enforce the obligations of the Borrower hereunder including, without limitation, the right to approve any amendment, modification or waiver of any provision of this Agreement; provided that such participation agreement may provide that such Bank will not agree to any modification, amendment or waiver of this Agreement described in clause (i), (ii), (iii) or (iv) of Section 9.5 without the consent of the Participant. The Borrower agrees that each Participant shall, to the extent provided in its participation agreement, be entitled to the benefits of Article VIII with respect to its participating interest (subject to the requirements and limitations therein, including the requirements under Section 8.4(d)(iii) (it being understood that the documentation required under Section 8.4(d)(iii) shall be delivered to the participating Lender)) to the same extent as if it were a Lender and had acquired its interest by assignment pursuant to paragraph (c) of this Section; provided that such Participant (i) agrees to be subject to the provisions of Sections 8.7 as if it were an assignee under paragraph (c) of this Section; and (ii) shall not be entitled to receive any greater payment under Sections 8.3 or 8.4, with respect to any participation, than its participating Lender would have been entitled to receive, except to the extent such entitlement to receive a greater payment results from a Change in Law that occurs after the Participant acquired the applicable participation. An assignment or other transfer which is not permitted by subsection (c) or (d) below shall be given effect for purposes of this Agreement only to the extent of a participating interest granted in accordance with this subsection (b). Each Lender that sells a participation shall, acting solely for this purpose as a non-fiduciary agent of the Borrower, maintain a register on which it enters the name and address of each Participant and the principal amounts (and stated interest) of each Participant's interest in the Loans or other obligations under the Loan Documents (the “Participant Register”); provided that no Lender shall have any obligation to disclose all or any portion of the Participant Register (including the identity of any Participant or any information relating to a Participant's interest in any commitments, loans, letters of credit or its other obligations under any Loan Document) to any Person except to the extent that such disclosure is necessary to establish that such commitment, loan, letter of credit or other obligation is in registered form under Section 5f.103-1(c) of the United States Treasury Regulations. The entries in the Participant Register shall be conclusive absent manifest error, and such Lender shall treat each Person whose name is recorded in the Participant Register as the owner of such participation for all purposes of this Agreement notwithstanding any notice to the contrary. For the avoidance of doubt, the Administrative Agent (in its capacity as Administrative Agent) shall have no responsibility for maintaining a Participant Register.

(b)Any Bank may at any time assign to one or more Eligible Assignees (each an “Assignee”) all, or a proportionate part of all, of its rights and obligations under this Agreement, the Notes and the other Loan Documents, and such Assignee shall assume such rights and obligations, pursuant to an Assignment and Assumption Agreement in substantially the form of Exhibit D attached hereto executed by such Assignee and such transferor Bank, with (and subject to) the prior written consent of (x) the Administrative Agent, which consent shall not be unreasonably withheld or delayed, and, (y) provided no Event of Default shall have occurred and be continuing, the Borrower, which consent shall not be unreasonably withheld or delayed, provided further, however, that no such consent by the Borrower shall be required in the case of an assignment to another Bank. Notwithstanding anything to the contrary contained herein, no Bank may assign or participate its interest to the Borrower and its Affiliates. Except in the case of an assignment to a Bank or an Affiliate of a Bank or an assignment of the entire remaining amount of the assigning Bank's Commitment, the amount of the Commitment or Loans of the assigning Bank subject to each such assignment (determined as of the date the Assignment and Assumption with respect to such assignment is delivered to the Administrative Agent) shall not be less than $5,000,000 unless each of the Borrower and the Administrative Agent otherwise consent, provided that no such consent of the Borrower shall be required if an Event of Default has occurred and is continuing. Each partial assignment shall be made as an assignment of a proportionate part of all the assigning Bank's rights and obligations under this Agreement. The assignee, if it shall not be a Bank, shall deliver to the Administrative Agent an Administrative Questionnaire. Upon execution and delivery of such instrument and payment by such Assignee to such

transferor Bank of an amount equal to the purchase price agreed between such transferor Bank and such Assignee, such Assignee shall be a Bank party to this Agreement and shall have all the rights and obligations of a Bank with a Commitment as set forth in such instrument of assumption, and the transferor Bank shall be released from its obligations hereunder to a corresponding extent, and no further consent or action by any party shall be required. Upon the consummation of any assignment pursuant to this subsection (c), the transferor Bank, the Administrative Agent and the Borrower shall make appropriate arrangements so that, if required, a new Note or Notes are issued to the Assignee. In connection with any such assignment (except for an assignment by a Bank to its Affiliate), the transferor Bank shall pay to the Administrative Agent an administrative fee for processing such assignment in the amount of $3,500. The Assignee shall deliver to the Borrower and the Administrative Agent certification as to exemption from deduction or withholding of any United States federal income taxes in accordance with Section 8.4.

(c)Any Bank (each, a “Designating Lender”) may at any time designate one Designated Lender to fund Money Market Loans on behalf of such Designating Lender subject to the terms of this Section 9.6(d) and the provisions in Section 9.6(b) and (c) shall not apply to such designation. No Bank may designate more than one (1) Designated Lender. The parties to each such designation shall execute and deliver to the Administrative Agent for its acceptance a Designation Agreement. Upon such receipt of an appropriately completed Designation Agreement executed by a Designating Lender and a designee representing that it is a Designated Lender, the Administrative Agent will accept such Designation Agreement and will give prompt notice thereof to the Borrower, whereupon, (i) the Borrower shall execute and deliver to the Designating Bank a Designated Lender Note payable to the Designated Lender, (ii) from and after the effective date specified in the Designation Agreement, the Designated Lender shall become a party to this Agreement with a right (subject to the provisions of Section 2.3(b)) to make Money Market Loans on behalf of its Designating Lender pursuant to Section 2.3 after the Borrower has accepted a Money Market Loan (or portion thereof) of the Designating Lender, and (iii) the Designated Lender shall not be required to make payments with respect to any obligations in this Agreement except to the extent of excess cash flow of such Designated Lender which is not otherwise required to repay obligations of such Designated Lender which are then due and payable; provided, however, that regardless of such designation and assumption by the Designated Lender, the Designating Lender shall be and remain obligated to the Borrower and the Banks for each and every of the obligations of the Designating Lender and its related Designated Lender with respect to this Agreement, including, without limitation, any indemnification obligations under Section 7.6 hereof and any sums otherwise payable to the Borrower by the Designated Lender. Each Designating Lender shall serve as the administrative agent of the Designated Lender and shall on behalf of, and to the exclusion of, the Designated Lender: (i) receive any and all payments made for the benefit of the Designated Lender and (ii) give and receive all communications and notices and take all actions hereunder, including, without limitation, votes, approvals, waivers, consents and amendments under or relating to this Agreement and the other Loan Documents. Any such notice, communication, vote, approval, waiver, consent or amendment shall be signed by the Designating Lender as administrative agent for the Designated Lender and shall not be signed by the Designated Lender on its own behalf and shall be binding upon the Designated Lender to the same extent as if signed by the Designated Lender on its own behalf. The Borrower, the Administrative Agent, and the Banks may rely thereon without any requirement that the Designated Lender sign or acknowledge the same. No Designated Lender may assign or transfer all or any portion of its interest hereunder or under any other Loan Document, other than assignments to the Designating Lender which originally designated such Designated Lender or otherwise in accordance with the provisions of Section 9.6(b) and (c).

(d)Any Bank may at any time assign or pledge all or any portion of its rights under this Agreement and its Note and the Letter(s) of Credit participated in by such Bank or, in the case of the Fronting Bank, issued by it, to secure obligations of such Bank, including any pledge to a Federal Reserve Bank. No such assignment shall release the transferor Bank from its obligations hereunder or substitute any such assignee or pledgee for such Bank as a party hereto.

(e)No Assignee, Participant or other transferee of any Bank's rights shall be entitled to receive any greater payment under Section 8.3 or 8.4 than such Bank would have been entitled to receive with respect to the rights transferred, unless such transfer is made with the Borrower's prior written consent or by reason of the provisions of Section 8.2, 8.3 or 8.4 requiring such Bank to designate a different Applicable Lending Office under certain circumstances or at a time when the circumstances giving rise to such greater payment did not exist.

(f)The Administrative Agent, acting solely for this purpose as an agent of the Borrower, shall maintain a register for the recordation of the names and addresses of the Banks, and the Commitments of, and principal amounts (and stated interest) of the Loans owing to, each Bank pursuant to the terms hereof from time to time (the “Register”). The entries in the Register shall be conclusive absent manifest error, and the Borrower, the Administrative Agent and the Banks shall treat each Person whose name is recorded in the Register pursuant to the terms hereof as a Bank hereunder for all purposes of this Agreement. The Register shall be available for inspection by the Borrower and any Bank, at any reasonable time and from time to time upon reasonable prior notice.

Section 94.USA Patriot Act. Each Bank hereby notifies the Borrower that pursuant to the requirements of the USA Patriot Act (Title III of Pub. L. 107-56 (signed into law October 26, 2001)) (the “Act”), it is required to obtain, verify and record information that identifies the Borrower, which information includes the name and address of the Borrower and other information that will allow such Bank to identify the Borrower in accordance with the Act.

Section 95.Defaulting Lenders. Notwithstanding any provision of this Agreement to the contrary, if any Bank becomes a Defaulting Lender, then the following provisions shall apply for so long as such Bank is a Defaulting Lender:

(a)fees shall cease to accrue on the Commitment of such Defaulting Lender pursuant to Section 2.8;

(b)the Commitment of such Defaulting Lender shall not be included in determining whether all Banks or the Required Banks have taken or may take any action hereunder (including any consent to any amendment or waiver pursuant to Section 9.5, except that the Defaulting Lender's consent shall be required in connection with any increase in such Defaulting Lender's Commitment pursuant to Section 9.5(b)(i), any amendment pursuant to Section 9.5(b)(ii) affecting its Loans or pursuant to Section 9.5(z)), provided that any waiver, amendment or modification requiring the consent of all Banks or each affected Bank which affects such Defaulting Lender differently than other affected Banks shall require the consent of such Defaulting Lender;

(c)if any Swingline Loans or Letters of Credit exist at the time a Bank becomes a Defaulting Lender then:

(i)all or any part of such liability with respect to Swingline Loans and Letters of Credit shall be reallocated among the non-Defaulting Lenders in accordance with their respective Commitment Percentages but only to the extent (x) the sum of all non-Defaulting Lenders' Obligations plus such Defaulting Lender's Commitment Percentage of Swingline Loans and Letter of Credit Usage does not exceed the total of all non-Defaulting Lenders' Commitments (it being understood that under no circumstance shall any Bank at any time be liable for any amounts in excess of its Commitment) and (y) the conditions set forth in Section 3.2(d) and (e) are satisfied at the time of such reallocation (and unless the Borrower shall have otherwise notified the Administrative Agent at such time, the Borrower shall be deemed to have represented and warranted that such conditions are satisfied at such time); and

(ii)if the reallocation described in clause (i) above cannot, or can only partially, be effected, the Borrower shall within five Domestic Business Days following notice by the Administrative Agent (x) first, prepay such Defaulting Lender's Commitment Percentage of the Swingline Loans and (y) second, cash collateralize for the benefit of the Fronting Bank only the Borrower's obligations corresponding to such Defaulting Lender's Commitment Percentage of the Letter of Credit Usage (after giving effect to any partial reallocation pursuant to clause (i) above) in accordance with the procedures set forth in Section 6.4(a) for so long as such Letters of Credit are outstanding;

(iii)if the Borrower cash collateralizes any portion of such Defaulting Lender's Commitment Percentage of the Letter of Credit Usage pursuant to this Section 9.8(c), the Borrower shall not be required to pay any fees to such Defaulting Lender with respect to such Defaulting Lender's Commitment Percentage of the Letter of Credit Usage during the period such Defaulting Lender's Commitment Percentage of the Letter of Credit Usage is cash collateralized;

(iv)if the Commitment Percentage of the non-Defaulting Lenders with respect to Letter of Credit Usage is reallocated pursuant to this Section 9.8(c), then the fees payable to the Lenders pursuant to this Agreement shall be adjusted in accordance with such non-Defaulting Lenders' Commitment Percentages; or

(v)if any Defaulting Lender's Commitment Percentage of Letter of Credit Usage is neither cash collateralized nor reallocated pursuant to clauses (i) or (ii) above, then, without prejudice to any rights or remedies of the Fronting Bank or any other Bank hereunder, all Facility Fees that otherwise would have been payable to such Defaulting Lender (solely with respect to the portion of such Defaulting Lender's Commitment that was utilized by such Commitment Percentage of Letter of Credit Usage) and Letter of Credit Fees payable under Section 2.8 with respect to such Defaulting Lender's Commitment Percentage of the Letter of Credit Usage shall be payable to the Fronting Bank until and to the extent that such Commitment Percentage of Letter of Credit Usage is reallocated and/or cash collateralized; and

(d)so long as such Bank is a Defaulting Lender, the Swingline Lender shall not be required to fund any Swingline Loan and the Fronting Bank shall not be required to issue, amend or increase any Letter of Credit, unless it is satisfied that the related exposure and the then Defaulting Lender's then outstanding Commitment Percentage of the Letter of Credit Usage will be 100% covered by the Commitments of the non-Defaulting Lenders and/or cash collateral will be provided by the Borrower in accordance with Section 9.8(c), and participating interests in any such newly issued or increased Letter of Credit or newly made Swingline Loan shall be allocated among non-Defaulting Lenders in a manner consistent with Section 9.8(c)(i) (and Defaulting Lender shall not participate therein).

If (i) a Bankruptcy Event with respect to a Parent of any Bank shall occur following the date hereof and for so long as such event shall continue or (ii) the Swingline Lender or the Fronting Bank has a good faith belief that any Bank has defaulted in fulfilling its obligations under one or more other agreements in which such Bank commits to extend credit, the Swingline Lender shall not be required to fund any Swingline Loan and the Fronting Bank shall not be required to issue, amend or increase any Letter of Credit, unless the Swingline Lender or the Fronting Bank, as the case may be, shall have entered into arrangements with the Borrower or such Bank, satisfactory to the Swingline Lender or the Fronting Bank, as the case may be, to defease any risk to it in respect of such Bank hereunder.

In the event that the Administrative Agent, the Borrower, the Fronting Bank and the Swingline Lender each agrees that a Defaulting Lender has adequately remedied all matters that caused such Bank to be a Defaulting Lender, then the Commitment Percentages of the Banks with respect to Swingline Loans and Letters of Credit shall be readjusted to reflect the inclusion of such Bank's Commitment and on such date such Bank shall purchase at par such of the Loans of the other Banks (other than Money Market Loans and Swingline Loans) as the Administrative Agent shall determine may be necessary in order for such Bank to hold such Loans in accordance with its Commitment Percentage.

Section 96.Governing Law; Submission to Jurisdiction.

(a)THIS AGREEMENT AND THE OTHER LOAN DOCUMENTS AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER AND THEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH AND BE GOVERNED BY THE LAWS OF THE STATE OF NEW YORK (WITHOUT GIVING EFFECT TO THE PRINCIPLES THEREOF RELATING TO CONFLICTS OF LAW THAT WOULD CAUSE THE APPLICATION OF ANY LAW OTHER THAN THE STATE OF NEW YORK).

(b)Any legal action or proceeding with respect to this Agreement or any other Loan Document and any action for enforcement of any judgment in respect thereof may be brought in the courts of the State of New York or of the United States of America for the Southern District of New York, and, by execution and delivery of this Agreement, the Borrower hereby accepts for itself and in respect of its property, generally and unconditionally, the non-exclusive jurisdiction of the aforesaid courts and appellate courts from any thereof. The Borrower irrevocably consents to the service of process out of any of the aforementioned courts in any such action or proceeding by the hand delivery, or mailing of copies thereof by registered or certified mail, postage prepaid, to the Borrower at its address set forth below. The Borrower hereby irrevocably waives any objection which it may now or hereafter have to the laying of venue of any of the aforesaid actions or proceedings arising out of or in connection with this Agreement or any other Loan Document brought in the courts referred to above and hereby further irrevocably waives and agrees not to plead or claim in any such court that any such action or proceeding brought in any such court has been brought in an inconvenient forum. Nothing herein shall affect the right of the Administrative Agent, any Bank or any holder of a Note to serve process in any other manner permitted by law or to commence legal proceedings or otherwise proceed against the Borrower in any other jurisdiction.

Section 97.Marshaling; Recapture. Neither the Administrative Agent nor any Bank shall be under any obligation to marshal any assets in favor of the Borrower or any other party or against or in payment of any or all of the Obligations. To the extent any Bank receives any payment by or on behalf of the Borrower, which payment or any part thereof is subsequently invalidated, declared to be fraudulent or preferential, set aside or required to be repaid to the Borrower or its estate, trustee, receiver, custodian or any other party under any bankruptcy law, state or federal law, common law or equitable cause, then to the extent of such payment or repayment, the Obligation or part thereof which has been paid, reduced or satisfied by the amount so repaid shall be reinstated by the amount so repaid and shall be included within the liabilities of the Borrower to such Bank as of the date such initial payment, reduction or satisfaction occurred.

Section 98.Counterparts; Integration; Effectiveness. This Agreement may be signed in any number of counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument. This Agreement constitutes the entire agreement and understanding among the parties hereto and supersedes any and all prior agreements and understandings, oral or written, relating to the subject matter hereof. This Agreement shall become effective upon receipt by the Administrative Agent of counterparts hereof signed by each of the parties hereto. Delivery of an executed counterpart of a signature page of this Agreement by telecopy, emailed pdf. or any other electronic means that reproduces an image of the actual executed signature page shall be effective as delivery of a manually executed counterpart of this Agreement.

Section 99.WAIVER OF JURY TRIAL. EACH OF THE BORROWER, THE ADMINISTRATIVE AGENT AND THE BANKS HEREBY IRREVOCABLY WAIVES ANY AND ALL RIGHT TO TRIAL BY JURY IN ANY LEGAL PROCEEDING ARISING OUT OF OR RELATING TO THIS AGREEMENT OR THE TRANSACTIONS CONTEMPLATED HEREBY. EACH PARTY HERETO (A) CERTIFIES THAT NO REPRESENTATIVE, AGENT OR ATTORNEY OF ANY OTHER PARTY HAS REPRESENTED, EXPRESSLY OR OTHERWISE, THAT SUCH OTHER PARTY WOULD NOT, IN THE EVENT OF LITIGATION, SEEK TO ENFORCE THE FOREGOING WAIVER AND (B) ACKNOWLEDGES THAT IT AND THE OTHER PARTIES HERETO HAVE BEEN INDUCED TO ENTER INTO THIS AGREEMENT BY, AMONG OTHER THINGS, THE MUTUAL WAIVERS AND CERTIFICATIONS IN THIS SECTION.

Section 100.Survival. All indemnities set forth herein shall survive the execution and delivery of this Agreement and the other Loan Documents and the making and repayment of the Loans hereunder.

Section 101.Domicile of Loans. Subject to the provisions of Article VIII, each Bank may transfer and carry its Loans at, to or for the account of any domestic or foreign branch office, subsidiary or Affiliate of such Bank.

Section 102.Limitation of Liability. No claim may be made by the Borrower or any other Person against the Administrative Agent or any Bank or the Affiliates, directors, officers, employees, attorneys or agent of any of them for any special, indirect consequential or punitive damages in respect of any claim for breach of contract or any other theory of liability arising out of or related to the transactions contemplated by this Agreement or by the other Loan Documents, or any

act, omission or event occurring in connection therewith; and the Borrower hereby waives, releases and agrees not to sue upon any claim for any such damages, whether or not accrued and whether or not known or suspected to exist in its favor.

Section 103.No Bankruptcy Proceedings. Each of the Borrower, the Banks, and the Administrative Agent hereby agrees that it will not institute against any Designated Lender or join any other Person in instituting against any Designated Lender any bankruptcy, reorganization, arrangement, insolvency or liquidation proceeding under any federal or state bankruptcy or similar law, until the later to occur of (i) one year and one day after the payment in full of the latest maturing commercial paper note issued by such Designated Lender and (ii) the Maturity Date.

Section 104.Optional Increase in Commitments. At any time prior to the Maturity Date, provided no Event of Default shall have occurred and then be continuing, the Borrower may, if it so elects, increase the aggregate amount of the Commitments (subject to proviso (b) in the next sentence), either by designating a Qualified Institution not theretofore a Bank to become a Bank (such designation to be effective only with the prior written consent of the Administrative Agent, which consent will not be unreasonably withheld) and/or by agreeing with an existing Bank or Banks that such Bank's Commitment shall be increased, it being understood that no such existing Bank or Banks shall have any obligation to so increase its Commitment). Upon execution and delivery by the Borrower and such Bank or other financial institution of an instrument in form reasonably satisfactory to the Administrative Agent, such existing Bank shall have a Commitment as therein set forth or such Qualified Institution shall become a Bank with a Commitment as therein set forth and all the rights and obligations of a Bank with such a Commitment hereunder; provided that:

(a)the Borrower shall provide prompt notice of such increase to the Administrative Agent, who shall promptly notify the Banks; and

(b)the amount of such increase, together with all other increases in the aggregate amount of the Commitments pursuant to this Section 9.17 since the date of this Agreement, does not cause the Loan Amount to exceed $700,000,000.

(c)Upon any increase in the aggregate amount of the Commitments pursuant to this Section 9.17, within five Business Days (in the case of any Base Rate Loans then outstanding) or at the end of the then current Interest Period with respect thereto (in the case of any Euro-Dollar Loans then outstanding), as applicable, each Bank's Commitment Percentage shall be recalculated to reflect such increase in the Commitments and the outstanding principal balance of the Loans shall be reallocated among the Banks such that the outstanding principal amount of Loans owed to each Bank shall be equal to such Bank's Commitment Percentage (as recalculated) thereof. All payments, repayments and other disbursements of funds by the Administrative Agent to Banks shall thereupon and, at all times thereafter be made in accordance with each Bank's recalculated Commitment Percentage. For purposes hereof, “Qualified Institution” means a Bank, or one or more banks, finance companies, insurance or other financial institutions which (i) (A) has (or, in the case of a bank which is a subsidiary, such bank's parent has) a rating of its senior debt obligations of not less than Baa-1 by Moody's or a comparable rating by a rating agency acceptable to the Administrative Agent and (B) has total assets in excess of Ten Billion Dollars ($10,000,000,000), or (ii) is reasonably acceptable to the Administrative Agent.

Section 105.Severability. Any provision of this Agreement held to be invalid, illegal or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective to the extent of such invalidity, illegality or unenforceability without affecting the validity, legality and enforceability of the remaining provisions hereof; and the invalidity of a particular provision in a particular jurisdiction shall not invalidate such provision in any other jurisdiction.

Section 106.Interest Rate Limitation. Notwithstanding anything herein to the contrary, if at any time the interest rate applicable to any Loan, together with all fees, charges and other amounts which are treated as interest on such Loan under applicable law (collectively the "Charges"), shall exceed the maximum lawful rate (the "Maximum Rate") which may be contracted for, charged, taken, received or reserved by the Bank holding such Loan in accordance with applicable law, the rate of interest payable in respect of such Loan hereunder, together with all Charges payable in respect thereof, shall be limited to the Maximum Rate and, to the extent lawful, the interest and Charges that would have been payable in respect of such Loan but were not payable as a result of the operation of this Section shall be cumulated and the interest and Charges payable to such Bank in respect of other Loans or periods shall be increased (but not above the Maximum Rate therefor) until such cumulated amount, together with interest thereon at the Federal Funds Rate to the date of repayment, shall have been received by such Bank.

IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed by their respective authorized officers as of the day and year first above written.

BORROWER:

KILROY REALTY, L.P., a Delaware limited partnership

By:    Kilroy Realty Corporation, a Maryland corporation, its general partner

By:    /s/ Tyler H. Rose

Name:    Tyler H. Rose     

Title:    Executive Vice President and

Chief Financial Officer

By:    /s/ Michelle Ngo

Name:    Michelle Ngo

Title:    Vice President and Treasurer

Kilroy Realty, L.P.

12200 West Olympic Boulevard, Suite 200

Los Angeles, California 90064

Attn: Tyler Rose and Michelle Ngo

Telephone number: (310) 481-8400

Telecopy number: (310) 841-6580

ADMINISTRATIVE AGENT AND BANK:

JPMORGAN CHASE BANK, N.A., as Administrative Agent and as a Bank

By:    /s/ Marc Costantino

Name:    Marc Costantino

Title:    Executive Director

JPMorgan Chase Bank, N.A.

383 Madison Avenue, 24^th Floor

New York, NY 10179

Attn: Marc Costantino

Telephone number: (212) 622-8167

Telecopy number: (212) 270-2157

Domestic and Euro-Dollar

Lending Office:

JPMorgan Chase Bank, N.A.

1111 Fannin, 10^th Floor

Houston, Texas 77002

Attn: Loan and Agency Services

Telephone: (713) 427-6887

Telecopy number: (713) 750-2892

SYNDICATION AGENT AND BANK:

BANK OF AMERICA, N.A.

By:    /s/ James P. Johnson

Name: James P. Johnson

Title: Senior Vice President

EXHIBIT A

NOTE

New York, New York

November 28, 2012

For value received, KILROY REALTY, L.P., a Delaware limited partnership (the “Borrower”) promises to pay to _______________ (the “Bank”), for the account of its Applicable Lending Office, the unpaid principal amount of each Loan made by the Bank to the Borrower pursuant to the Credit Agreement referred to below on the Maturity Date. The Borrower promises to pay interest on the unpaid principal amount of each such Loan on the dates and at the rate or rates provided for in the Credit Agreement. All such payments of principal and interest shall be made in lawful money of the United States in Federal or other immediately available funds at the office of Administrative Agent under the Credit Agreement (as defined below).

All Loans made by the Bank, the respective types and maturities thereof and all repayments of the principal thereof shall be recorded by the Bank and, if the Bank so elects in connection with any transfer or enforcement hereof, appropriate notations to evidence the foregoing information with respect to each such Loan then outstanding may be endorsed by the Bank on the schedule attached hereto, or on a continuation of such schedule attached to and made a part hereof; provided that the failure of the Bank to make any such recordation or endorsement shall not affect the obligations of the Borrower hereunder or under the Credit Agreement.

This Note is one of the Notes referred to in the Amended and Restated Revolving Credit Agreement, dated as of November 28, 2012, among the Borrower, the Banks party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent and as Bank, J.P. Morgan Securities LLC, as Joint Lead Arranger and Joint Bookrunner, Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Joint Lead Arranger and Joint Bookrunner, and Bank of America, N.A., as Syndication Agent (as the same may be amended from time to time, the “Credit Agreement”).

Terms defined in the Credit Agreement are used herein with the same meanings. Reference is made to the Credit Agreement for provisions for the prepayment hereof and the acceleration of the maturity hereof.

KILROY REALTY, L.P., a Delaware limited partnership

By:    Kilroy Realty Corporation, a Maryland corporation, its general partner

By:    _____________________

Name:    

Title:

By:    _____________________

Name:    

Title:

Note (cont'd)

LOANS AND PAYMENTS OF PRINCIPAL

Date Amount of Loan Type of Loan Amount of Principal Repaid Maturity Date Notation Made By

EXHIBIT A-1

NOTE

(Money Market Loans)

$______________    New York, New York

November 28, 2012

For value received, KILROY REALTY, L.P., a Delaware limited partnership (the “Borrower”) promises to pay to _______________ (the “Bank”), for the account of its Applicable Lending Office, the unpaid principal amount of each Money Market Loan made by the Bank to the Borrower pursuant to the Credit Agreement referred to below on the Maturity Date. The Borrower promises to pay interest on the unpaid principal amount of each such Money Market Loan on the dates and at the rate or rates provided for in the Credit Agreement. All such payments of principal and interest shall be made in lawful money of the United States in Federal or other immediately available funds at the office of Administrative Agent under the Credit Agreement (as defined below).

All Money Market Loans made by the Bank, the respective types and maturities thereof and all repayments of the principal thereof shall be recorded by the Bank and, if the Bank so elects in connection with any transfer or enforcement hereof, appropriate notations to evidence the foregoing information with respect to each such Loan then outstanding may be endorsed by the Bank on the schedule attached hereto, or on a continuation of such schedule attached to and made a part hereof; provided that the failure of the Bank to make any such recordation or endorsement shall not affect the obligations of the Borrower hereunder or under the Credit Agreement.

This Note is one of the Designated Lender Notes referred to in the Amended and Restated Revolving Credit Agreement, dated as of November 28, 2012, among the Borrower, the Banks party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent and as Bank, J.P. Morgan Securities LLC, as Joint Lead Arranger and Joint Bookrunner, Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Joint Lead Arranger and Joint Bookrunner, and Bank of America, N.A., as Syndication Agent (as the same may be amended from time to time, the “Credit Agreement”).

Terms defined in the Credit Agreement are used herein with the same meanings. Reference is made to the Credit Agreement for provisions for the prepayment hereof and the acceleration of the maturity hereof.

KILROY REALTY, L.P., a Delaware limited partnership

By:    Kilroy Realty Corporation, a Maryland corporation, its general partner

By:    _____________________

Name:    

Title:

By:    _____________________

Name:    

Title:

Note (cont'd)

LOANS AND PAYMENTS OF PRINCIPAL

Date Amount of Loan Type of Loan Amount of Principal Repaid Maturity Date Notation Made By

EXHIBIT B

Unencumbered Asset Pool Properties

(Fee Interests)

PROPERTY LOCATION

EXHIBIT C

Unencumbered Asset Pool Properties

(Leasehold Interests)

EXHIBIT D

FORM OF ASSIGNMENT AND ASSUMPTION

ASSIGNMENT AND ASSUMPTION AGREEMENT

AGREEMENT dated as of __________, ____ among [ASSIGNOR] (the “Assignor”), [ASSIGNEE] (the “Assignee”), KILROY REALTY, L.P. (the “Borrower”) and JPMORGAN CHASE BANK, N.A., as Administrative Agent (the “Agent”).

W I T N E S S E T H

WHEREAS, this Assignment and Assumption Agreement (the “Assignment”) relates to the Amended and Restated Revolving Credit Agreement, dated as of November 28, 2012, among the Borrower, the Banks party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent and as Bank, J.P. Morgan Securities LLC, as Joint Lead Arranger and Joint Bookrunner, Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Joint Lead Arranger and Joint Bookrunner, and Bank of America, N.A., as Syndication Agent (as the same may be amended from time to time, the “Credit Agreement”).

WHEREAS, as provided under the Credit Agreement, the Assignor has a Commitment to make Loans to the Borrower in an aggregate principal amount at any time outstanding not to exceed $__________;

WHEREAS, Loans made to the Borrower by the Assignor under the Credit Agreement in the aggregate principal amount of $____________ are outstanding at the date hereof; and

WHEREAS, the Assignor proposes to assign to the Assignee all of the rights of the Assignor under the Credit Agreement in respect of a portion of its Commitment thereunder in an amount equal to $__________ (the “Assigned Amount”), together with a corresponding portion of its outstanding Loans, and the Assignee proposes to accept assignment of such rights and assume the corresponding obligations from the Assignor on such terms;

NOW, THEREFORE, in consideration of the foregoing and the mutual agreements contained herein, the parties hereto agree as follows:

SECTION 1.    Definitions. All capitalized terms not otherwise defined herein shall have the respective meanings set forth in the Credit Agreement.

SECTION 2.    Assignment. The Assignor hereby assigns and sells to the Assignee all of the rights of the Assignor under the Credit Agreement to the extent of the Assigned Amount, and the Assignee hereby accepts such assignment from the Assignor and assumes all of the obligations of the Assignor under the Credit Agreement to the extent of the Assigned Amount, including the purchase from the Assignor of the corresponding portion of the principal amount of the Loans made by the Assignor outstanding at the date hereof. Upon the execution and delivery hereof by the Assignor, the Assignee, the Borrower and the Agent and the payment of the amounts specified in Section 3 required to be paid on the date hereof (i) the Assignee shall, as of the date hereof, succeed to the rights and be obligated to perform the obligations of a Bank under the Credit Agreement with a Commitment in an amount equal to the Assigned Amount, and (ii) the Commitment of the Assignor shall, as of the date hereof, be reduced by a like amount and the Assignor released from its obligations under the Credit Agreement to the extent such obligations have been assumed by the Assignee. The assignment provided for herein shall be without recourse to the Assignor.

SECTION 3.    Payments. As consideration for the assignment and sale contemplated in Section 2 hereof, the Assignee shall pay to the Assignor on the date hereof in Federal funds the amount heretofore agreed between them.    The amount should combine principal together with accrued interest and breakage compensation, if any, to be paid by the Assignee, net of any portion of any up-front fee to be paid by the Assignor to the Assignee. It may be preferable in an appropriate case to specify these amounts generically or by formula rather than as a fixed sum. It is understood that

Commitment Fees accrued to the date hereof are for the account of the Assignor and such fees accruing from and including the date hereof are for the account of the Assignee. Each of the Assignor and the Assignee hereby agrees that if it receives any amount under the Credit Agreement which is for the account of the other party hereto, it shall receive the same for the account of such other party to the extent of such other party's interest therein and shall promptly pay the same to such other party.

SECTION 4.    Consent of the Borrower and the Agent. This Agreement is conditioned upon the written consent of the Borrower and the consent of the Agent pursuant to Section 9.6(c) of the Credit Agreement. The execution of this Agreement by the Borrower and the Agent is evidence of the required consents. Pursuant to Section 9.6(c) the Borrower agrees to execute and deliver a Note payable to the Assignee to evidence the assignment and assumption provided for herein.

SECTION 5.    Non-Reliance on Assignor. The Assignor represents and warrants that it is the legal and beneficial owner of the interest being assigned by it hereunder, that it has not created any adverse claim upon such interest and that such interest is free and clear of any adverse claim, and that it is authorized to enter into this Agreement. The Assignor makes no other representation or warranty in connection with, and shall have no responsibility with respect to, the solvency, financial condition, or statements of the Borrower, or the validity and enforceability of the obligations of the Borrower in respect of the Credit Agreement or any Note. The Assignee acknowledges that it has, independently and without reliance on the Assignor, and based on such documents and information as it has deemed appropriate, made its own credit analysis and decision to enter into this Agreement and will continue to be responsible for making its own independent appraisal of the business, affairs and financial condition of the Borrower. The Assignee represents and warrants that it is authorized to enter into this Agreement.

SECTION 6.    Governing Law. This Agreement shall be governed by and construed in accordance with the external laws of the State of New York.

SECTION 7.    Counterparts. This Agreement may be signed in any number of counterparts, each of which shall be an original, with the same effect as if the signatures thereto and hereto were upon the same instrument.

IN WITNESS WHEREOF, the parties have caused this Agreement to be executed and delivered by their duly authorized officers as of the date first above written.

[ASSIGNOR]

By:____________________________

Name:

Title:

[ASSIGNEE]

By:____________________________

Name:

Title:

JPMORGAN CHASE BANK, N.A., as Administrative Agent

By:________________________

Name:

Title:

CONSENTED TO:

KILROY REALTY, L.P.

By:    Kilroy Realty Corporation,

its general partner

By:    ____________________

Name: Tyler H. Rose

Title: Executive Vice President and

Chief Financial Officer

By:    ____________________

Name:

Title:

EXHIBIT E

Form of Money Market Quote Request

[Date]

To:        JPMORGAN CHASE BANK, N.A. (the “Administrative Agent”)

From:        Kilroy Realty, L.P. (the “Borrower”)

Re: Amended and Restated Revolving Credit Agreement, dated as of November 28, 2012, among the Borrower, the Banks party thereto, the Administrative Agent, J.P. Morgan Securities LLC, as Joint Lead Arranger and Joint Bookrunner, Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Joint Lead Arranger and Joint Bookrunner, and Bank of America, N.A., as Syndication Agent (as the same may be amended from time to time, the “Credit Agreement”).

We hereby give notice pursuant to Section 2.3 of the Credit Agreement that we request Money Market Quotes for the following proposed Money Market Borrowing(s):

Date of Borrowing: __________________

Principal Amount    Amount must be $10,000,000 or a larger multiple of $500,000.            Interest Period    Not less than one month (LIBOR Auction) or not less than 30 days (Absolute Rate Auction), subject to the provisions of the definition of Interest Period.

$

Such Money Market Quotes should offer a Money Market [Margin] [Absolute Rate]. [The applicable base rate is the London Interbank Offered Rate.]

The funding of Money Market Loans made in connection with this Money Market Quote Request [may/may not] be made by Designated Lenders.

Terms used herein have the meanings assigned to them in the Credit Agreement.

Kilroy Realty, L.P.

By:    Kilroy Realty Corporation

By:_______________________    

Name:

Title:

By:_______________________    

Name:

Title:

EXHIBIT F

Form of Invitation for Money Market Quotes

To:    [Name of Bank]

Re:    Invitation for Money Market Quotes to Kilroy Realty, L.P. (the “Borrower”)

Pursuant to Section 2.3 of the Amended and Restated Revolving Credit Agreement, dated as of November 28, 2012, among the Borrower, the Banks party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent and as Bank, J.P. Morgan Securities LLC, as Joint Lead Arranger and Joint Bookrunner, Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Joint Lead Arranger and Joint Bookrunner, and Bank of America, N.A., as Syndication Agent, we are pleased on behalf of the Borrower to invite you to submit Money Market Quotes to the Borrower for the following proposed Money Market Borrowing(s):

Date of Borrowing: __________________

Principal AmountInterest Period

$

Such Money Market Quotes should offer a Money Market [Margin] [Absolute Rate]. [The applicable base rate is the London Interbank Offered Rate.]

Please respond to this invitation by no later than 10:00 A.M. (New York City time) on [date].

JPMORGAN CHASE BANK, N.A., as

Administrative Agent

By:_____________________________

Authorized Officer

EXHIBIT G

Form of Money Market Quote

To:    JPMorgan Chase Bank, N.A., as Administrative Agent (the “Administrative

Agent”)

Re:    Money Market Quote to Kilroy Realty, L.P. (the “Borrower”)

In response to your invitation on behalf of the Borrower dated _____________, 20__, we hereby make the following Money Market Quote on the following terms:

1.    Quoting Bank: ________________________________

2.    Person to contact at Quoting Bank:

_____________________________

3.    Date of Borrowing: ____________________*

4. We hereby offer to make Money Market Loan(s) in the following principal amounts, for the following Interest Periods and at the following rates:

Principal    Interest        Money Market

Amount**Period***[Margin****] [Absolute Rate*****]

$

$

[Provided, that the aggregate principal amount of Money Market Loans for which the above offers may be accepted shall not exceed $____________.]**

We understand and agree that the offer(s) set forth above, subject to the satisfaction of the applicable conditions set forth in the Amended and Restated Revolving Credit Agreement, dated as of November 28, 2012, among the Borrower, the Banks party thereto, the Administrative Agent and as Bank, J.P. Morgan Securities LLC, as Joint Lead Arranger and Joint Bookrunner, Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Joint Lead Arranger and Joint Bookrunner, and Bank of America, N.A., as Syndication Agent, irrevocably obligates us to make the Money Market Loan(s) for which any offer(s) are accepted, in whole or in part.

Very truly yours,

[NAME OF BANK]

Dated:_______________        By:____________________________

Authorized Officer

Exhibit H

FORM OF DESIGNATION AGREEMENT

Dated _____________, 201_

Reference is made to that certain Amended and Restated Revolving Credit Agreement, dated as of November 28, 2012 (the “Credit Agreement”), among the Borrower, the Banks party thereto, JPMorgan Chase Bank, N.A., as Administrative Agent and as Bank, J.P. Morgan Securities LLC, as Joint Lead Arranger and Joint Bookrunner, Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Joint Lead Arranger and Joint Bookrunner, and Bank of America, N.A., as Syndication Agent. Terms defined in the Credit Agreement are used herein with the same meaning.

[NAME OF DESIGNOR] (the “Designor”), [NAME OF DESIGNEE] (the “Designee”) and the Administrative Agent agree as follows:

1.    The Designor hereby designates the Designee, and the Designee hereby accepts such designation, to have a right to make Money Market Loans pursuant to Article III of the Credit Agreement. Any assignment by Designor to Designee of its rights to make a Money Market Loan pursuant to such Article III shall be effective at the time of the funding of such Money Market Loan and not before such time.

2.    Except as set forth in Section 7 below, the Designor makes no representation or warranty and assumes no responsibility pursuant to this Designation Agreement with respect to (a) any statements, warranties or representations made in or in connection with any Loan Document or the execution, legality, validity, enforceability, genuineness, sufficiency or value of any Loan Document or any other instrument and document furnished pursuant thereto and (b) the financial condition of the Borrower or the performance or observance by the Borrower of any of its obligations under any Loan Document or any other instrument or document furnished pursuant thereto.

3.    The Designee (a) confirms that it has received a copy of each Loan Document, together with copies of the financial statements referred to in Articles IV and V of the Credit Agreement and such other documents and information as it has deemed appropriate to make its own credit analysis and decision to enter into this Designation Agreement; (b) agrees that it will independently and without reliance upon the Administrative Agent, the Designor or any other Bank and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit decisions in taking or not taking action under any Loan Document; (c) confirms that it is a Designated Lender; (d) appoints and authorizes the Administrative Agent to take such action as agent on its behalf and to exercise such powers and discretion under any Loan Document as are delegated to the Administrative Agent by the terms thereof, together with such powers and discretion as are reasonably incidental thereto; and (e) agrees to be bound by each and every provision of each Loan Document and further agrees that it will perform in accordance with their terms all of the obligations which by the terms of any Loan Document are required to be performed by it as a Bank.

4.    The Designee hereby appoints Designor as Designee's agent and attorney in fact, and grants to Designor an irrevocable power of attorney, to receive payments made for the benefit of Designee under the Credit Agreement, to deliver and receive all communications and notices under the Credit Agreement and other Loan Documents and to exercise on Designee's behalf all rights to vote and to grant and make approvals, waivers, consents of amendments to or under the Credit Agreement or other Loan Documents. Any document executed by the Designor on the Designee's behalf in connection with the Credit Agreement or other Loan Documents shall be binding on the Designee. The Borrower, the Administrative Agent and each of the Banks may rely on and are beneficiaries of the preceding provisions.

5.    Following the execution of this Designation Agreement by the Designor and its Designee, it will be delivered to the Administrative Agent for acceptance and recording by the Administrative Agent. The effective date for this Designation Agreement (the “Effective Date”) shall be the date of acceptance hereof by the Administrative Agent, unless otherwise specified on the signature page thereto.

6.    The Administrative Agent hereby agrees that it will not institute against any Designated Lender or join any other Person in instituting against any Designated Lender any bankruptcy, reorganization, arrangement, insolvency or liquidation proceeding under any federal or state bankruptcy or similar law, until the later to occur of (i) one year and one day after the payment in full of the latest maturing commercial paper note issued by such Designated Lender and (ii) the Maturity Date.

7.    The Designor unconditionally agrees to pay or reimburse the Designee and save the Designee harmless against all liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs, expenses or disbursements of any kind or nature whatsoever which may be imposed or asserted by any of the parties to the Loan Documents against the Designee, in its capacity as such, in any way relating to or arising out of this Agreement or any other Loan Documents or any action taken or omitted by the Designee hereunder or thereunder, provided that the Designor shall not be liable for any portion of such liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs, expenses or disbursements if the same results from the Designee's gross negligence or willful misconduct.

8.    Upon such acceptance and recording by the Administrative Agent, as of the Effective Date, the Designee shall be a party to the Credit Agreement with a right (subject to the provisions of Section 2.3(b)) to make Money Market Loans as a Bank pursuant to Section 2.3 of the Credit Agreement and the rights and obligations of a Bank related thereto; provided, however, that the Designee shall not be required to make payments with respect to such obligations except to the extent of excess cash flow of such Designee which is not otherwise required to repay obligations of such Designated Lender which are then due and payable. Notwithstanding the foregoing, the Designor, as administrative agent for the Designee, shall be and remain obligated to the Borrower and the Banks for each and every of the obligations of the Designee and its Designor with respect to the Credit Agreement, including, without limitation, any indemnification obligations under Section 7.6 of the Credit Agreement and any sums otherwise payable to the Borrower by the Designee.

9.    This Designation Agreement shall be governed by, and construed in accordance with, the laws of the State of New York.

10.    This Designation Agreement may be executed in any number of counterparts and by different parties hereto in separate counterparts, each of which when so executed shall be deemed to be an original and all of which taken together shall constitute one and the same agreement. Delivery of an executed counterpart of a signature page to this Designation Agreement by facsimile transmission shall be effective as delivery of a manually executed counterpart of this Designation Agreement.

IN WITNESS WHEREOF, the Designor and the Designee, intending to be legally bound, have caused this Designation Agreement to be executed by their officers thereunto duly authorized as of the date first above written.

Effective Date:    ________________________, 201__

[NAME OF DESIGNOR], as Designor

By: ___________________________

Title: _________________________

[NAME OF DESIGNEE] as Designee

By: ___________________________

Title: __________________________

Applicable Lending Office

(and address for notices):

[ADDRESS]

Accepted this _____ day

of ___________, 201_

JPMORGAN CHASE BANK, N.A.,

as Administrative Agent

By: _____________________

Title: ___________________

SCHEDULE 1

COMMITMENTS

SCHEDULE 4.22

LABOR MATTERS

[To be provided.]

EX-10.57

Exhibit 10.57

AMENDED AND RESTATED GUARANTY OF PAYMENT

AMENDED AND RESTATED GUARANTY OF PAYMENT (this “Guaranty”), made as of November 28, 2012, between KILROY REALTY CORPORATION, a Maryland corporation, having an address at 12200 West Olympic Boulevard, Suite 200, Los Angeles, California 90064 (“Guarantor”), and JPMORGAN CHASE BANK, N.A., having an office at 383 Madison Avenue, New York, NY 10179, as administrative agent (the “Administrative Agent”) for the banks (the “Banks”) listed on the signature pages of the Amended and Restated Revolving Credit Agreement (as the same may be amended, modified, supplemented or restated, the “Credit Agreement”), dated as of the date hereof, among Kilroy Realty, L.P. (“Borrower”), the Banks, the Administrative Agent, in its capacity as Administrative Agent and Bank, J.P. Morgan Securities LLC, as Joint Lead Arranger and Joint Bookrunner, Merrill Lynch, Pierce, Fenner & Smith Incorporated, as Joint Lead Arranger and Joint Bookrunner, Bank of America, N.A., as Syndication Agent, and Barclays Bank PLC, Compass Bank, PNC Bank, National Association, Royal Bank of Canada, Union Bank, N.A. and Wells Fargo Bank, N.A., as Documentation Agents.

WITNESSETH:

WHEREAS, as a condition to the execution and delivery of the Credit Agreement, the Banks have required that Guarantor enter into this Guaranty; and

WHEREAS, capitalized terms used herein and not otherwise defined shall have the meanings ascribed thereto in the Credit Agreement;

NOW, THEREFORE, the parties hereto hereby agree as follows:

1.Guarantor, on behalf of itself and its successors and assigns, hereby irrevocably, absolutely and unconditionally guarantees the full and punctual payment and for performance when due, whether at stated maturity or otherwise, of all Obligations of Borrower now or hereafter existing under the Credit Agreement and the other Loan Documents, for principal and/or interest as well as any and all other amounts due thereunder, including, without limitation, all indemnity obligations of Borrower thereunder, and any and all reasonable costs and expenses (including, without limitation, reasonable attorneys' fees and disbursements) incurred by the Administrative Agent or the Banks in enforcing its rights under this Guaranty (all of the foregoing obligations being the “Guaranteed Obligations”).

2.It is agreed that the Guaranteed Obligations of Guarantor hereunder are primary and this Guaranty shall be enforceable against Guarantor and its successors and assigns without the necessity for any suit or proceeding of any kind or nature whatsoever brought by the Administrative Agent against Borrower or its respective successors or assigns or any other party or against any security for the payment and performance of the Guaranteed Obligations and without the necessity of any notice of non-payment or non-observance or of any notice of acceptance of this Guaranty or of any notice or demand to which Guarantor might otherwise be entitled (including, without limitation, diligence, presentment, notice of maturity, extension of time, change in nature or form of the Guaranteed Obligations, acceptance of further security, release of further security, imposition or agreement arrived at as to the amount of or the terms of the Guaranteed Obligations, notice of adverse change in Borrower's financial condition and any other fact which might materially increase the risk to Guarantor), all of which Guarantor hereby expressly waives; and Guarantor hereby expressly agrees that the validity of this Guaranty and the obligations of Guarantor hereunder shall in no way be terminated, affected, diminished, modified or impaired by reason of the assertion of or the failure to assert by the Administrative Agent against Borrower or its respective successors or assigns, any of the rights or remedies reserved to the Administrative Agent pursuant to the provisions of the Loan Documents.

Guarantor agrees that any notice or directive given at any time to the Administrative Agent which is inconsistent with the waiver in the immediately preceding sentence shall be void and may be ignored by the Administrative Agent, and, in addition, may not be pleaded or introduced as evidence in any litigation relating to this Guaranty for the reason that such pleading or introduction would be at variance with the written terms of this Guaranty, unless the Administrative Agent has specifically agreed otherwise in a writing, signed by a duly authorized officer of the Administrative Agent. Guarantor specifically acknowledges and agrees that the foregoing waivers are of the essence of this transaction and that, but for this Guaranty and such waivers, the Administrative Agent would decline to execute the Loan Documents.

3.Guarantor waives, and covenants and agrees that it will not at any time insist upon, plead or in any manner whatsoever claim or take the benefit or advantage of, any and all appraisal, valuation, stay, extension, marshaling-of-assets or redemption laws, or right of homestead or other exemption, whether now or at any time hereafter in force, which may delay, prevent or otherwise affect the performance by Guarantor of its obligations under, or the enforcement by the Administrative Agent of, this Guaranty. Guarantor further covenants and agrees not to set up or claim any defense, counterclaim, offset, set-off or other objection of any kind to any action, suit or proceeding in law, equity or otherwise, or to any demand or claim that may be instituted or made by the Administrative Agent other than the defense of the actual timely payment and performance by Borrower of the Guaranteed Obligations hereunder; provided, however, that the foregoing shall not be deemed a waiver of Guarantor's right to assert any compulsory counterclaim, if such counterclaim is compelled under local law or rule of procedure, nor shall the foregoing be deemed a waiver of Guarantor's right to assert any claim which would constitute a defense, setoff, counterclaim or crossclaim of any nature whatsoever against Administrative Agent or any Bank in any separate action or proceeding. Guarantor represents, warrants and agrees that, as of the date hereof, its obligations under this Guaranty are not subject to any counterclaims, offsets or defenses against the Administrative Agent or any of the Banks of any kind.

4.The provisions of this Guaranty are for the benefit of the Administrative Agent and the Banks and their successors and permitted assigns, and nothing herein contained shall impair as between Borrower and the Administrative Agent and the Banks the obligations of Borrower under the Loan Documents.

5.This Guaranty shall be a continuing, unconditional and absolute guaranty and the liability of Guarantor hereunder shall in no way be terminated, affected, modified, impaired or diminished by reason of the happening, from time to time, of any of the following, although without notice or the further consent of Guarantor:

(a)any assignment, amendment, modification or waiver of or change in any of the terms, covenants, conditions or provisions of any of the Guaranteed Obligations or the Loan Documents or the invalidity or unenforceability of any of the foregoing; or

(b)any extension of time that may be granted by the Administrative Agent and/or any Bank to Borrower, any guarantor, or their respective successors or assigns, heirs, executors, administrators or personal representatives; or

(c)any action which the Administrative Agent may take or fail to take under or in respect of any of the Loan Documents or by reason of any waiver or, or failure to enforce any of the rights, remedies, powers or privileges available to the Administrative Agent under this Guaranty or available to the Administrative Agent at law, equity or otherwise, or any action on the part of the Administrative Agent granting indulgence or extension in any form whatsoever; or

(d)any sale, exchange, release, or other disposition of any property pledged, mortgaged or conveyed, or any property in which the Administrative Agent and/or the Banks have been granted a lien or security interest to secure any indebtedness of Borrower to the Administrative Agent and/or the Banks; or

(e)any release of any person or entity who may be liable in any manner for the payment and collection of any amounts owed by Borrower to the Administrative Agent and/or the Banks; or

(f)the application of any sums by whomsoever paid or however realized to any amounts owing by Borrower to the Administrative Agent and/or the Banks under the Loan Documents in such manner as the Administrative Agent shall determine in its sole discretion; or

(g)Borrower's or any guarantor's voluntary or involuntary liquidation, dissolution, sale of all or substantially all of their respective assets and liabilities, appointment of a trustee, receiver, liquidator, sequestrator or conservator for all or any part of Borrower's or Guarantor's assets, insolvency, bankruptcy, assignment for the benefit of creditors, reorganization, arrangement, composition or readjustment, or the commencement of other similar proceedings affecting Borrower or any guarantor or any of the assets of any of them, including, without limitation, (i) the release or discharge of Borrower or any guarantor from the payment and performance of their respective obligations under any of the Loan Documents by operation of law, or (ii) the impairment, limitation or modification of the liability of Borrower or any guarantor in bankruptcy, or of any remedy for the enforcement of the Guaranteed Obligations under any of the Loan Documents, or Guarantor's liability under this Guaranty, resulting from the operation of any present or future provisions of the Bankruptcy Code or other present or future federal, state or applicable statute or law or from the decision in any court; or

(h)any improper disposition by Borrower of the proceeds of the Loans, it being acknowledged by Guarantor that the Administrative Agent or any Bank shall be entitled to honor any request made by Borrower for a disbursement of such proceeds and that neither the Administrative Agent nor any Bank shall have any obligation to see to the proper disposition by Borrower of such proceeds.

6.Guarantor agrees that if at any time all or any part of any payment at any time received by the Administrative Agent and/or any Bank from Borrower or Guarantor under or with respect to this Guaranty is or must be rescinded or returned by the Administrative Agent or any Bank for any reason whatsoever (including, without limitation, the insolvency, bankruptcy or reorganization of Borrower or Guarantor), then Guarantor's obligations hereunder shall, to the extent of the payment rescinded or returned, be deemed to have continued in existence notwithstanding such previous receipt by such party, and Guarantor's obligations hereunder shall continue to be effective or reinstated, as the case may be, as to such payment, as though such previous payment had never been made.

7.Until this Guaranty is terminated pursuant to the terms hereof, Guarantor (i) shall have no right of subrogation against Borrower or any entity comprising same by reason of any payments or acts of performance by Guarantor in compliance with the obligations of Guarantor hereunder; (ii) waives any right to enforce any remedy which Guarantor now or hereafter shall have against Borrower or any entity comprising same by reason of any one or more payment or acts of performance in compliance with the obligations of Guarantor hereunder and (iii) subordinates any liability or indebtedness of Borrower or any entity comprising same now or hereafter held by Guarantor or any affiliate of Guarantor to the obligations of Borrower under the Loan Documents, provided, however, until an Event of Default has occurred and is continuing, Borrower or any entity comprising same shall not be prohibited from making payments to Guarantor or any affiliate thereof on such subordinated liability or indebtedness in accordance with the terms thereof. The foregoing, however, shall not be deemed in any way to limit any rights that Guarantor may have pursuant to the Agreement of Limited Partnership of Borrower or which it may have at law or in equity with respect to any other partners of Borrower.

8.Guarantor represents and warrants to the Administrative Agent and the Banks (with the knowledge that the Administrative Agent and the Banks are relying upon the same) as of the date hereof, as follows:

(a)as of the date hereof, Guarantor is the sole general partner of Borrower;

(b)based upon such relationship, Guarantor has determined that it is in its best interests to enter into this Guaranty;

(c)in the good faith judgment of Guarantor, the benefits to be derived by Guarantor from Borrower's access to funds made possible by the Loan Documents are at least equal to the obligations undertaken pursuant to this Guaranty;

(d)Guarantor is solvent and has corporate power and authority to enter into this Guaranty and to perform its obligations under the term hereof and (i) Guarantor is organized and validly existing under the laws of the State of Maryland, (ii) Guarantor has complied with all provisions of applicable law in connection with all aspects of this Guaranty, and (iii) the persons executing this Guaranty have all the requisite power and authority to execute and deliver this Guaranty;

(e)to the best of Guarantor's knowledge, there is no action, suit, proceeding, or investigation pending or threatened against or affecting Guarantor at law, in equity, in admiralty or before any arbitrator or any governmental department, commission, board, bureau, agency or instrumentality (domestic or foreign) which is reasonably likely to materially and adversely impair the ability of Guarantor to perform its obligations under this Guaranty;

(f)the execution and delivery of and the performance by Guarantor of its obligations under this Guaranty have been duly authorized by all necessary action on the part of Guarantor and do not (i) violate any provision of any law, rule, regulation (including, without limitation, Regulation U, T or X of the Board of Governors of the Federal Reserve System of the United States), order, writ, judgment, decree, determination or award presently in effect having applicability to Guarantor or the organizational documents of Guarantor the consequences of which violation is likely to materially and adversely impair the ability of Guarantor to perform its obligations under this Guaranty or (ii) violate or conflict with, result in a breach of or constitute a default under any material indenture, agreement or other instrument to which Guarantor is a party, or by which Guarantor or any of its property is bound the consequences of which violation, conflict, breach or default is reasonably likely to materially and adversely impair the ability of Guarantor to perform its obligations under this Guaranty;

(g)this Guaranty has been duly executed by Guarantor and constitutes the legal, valid and binding obligation of Guarantor, enforceable against it in accordance with its terms except as enforceability may be limited by applicable insolvency, bankruptcy or other laws affecting creditors' rights generally or general principles of equity, whether such enforceability is considered in a proceeding in equity or at law;

(h)no authorization, consent, approval, license or formal exemption from, nor any filing, declaration or registration with, any Federal, state, local or foreign court, governmental agency or regulatory authority is required in connection with the execution, delivery and performance by Guarantor of this Guaranty, except those which have already been obtained; and

(i)Guarantor is not an “investment company” as that term is defined in, nor is it otherwise subject to regulation under, the Investment Company Act of 1940, as amended.

9.Guarantor and the Administrative Agent each acknowledge and agree that this Guaranty is a guarantee of payment and performance and not of collection and enforcement in respect of any obligations which may accrue to the Administrative Agent and/or the Banks from Borrower under the provisions of any Loan Document.

10.Subject to the terms and conditions of the Credit Agreement, and in conjunction therewith, the Administrative Agent or any Bank may assign any or all of its rights under this Guaranty. In the event of any such assignment, the Administrative Agent shall give Guarantor prompt written notice of same. If the Administrative Agent and/or any Bank elects to sell all the Loans or participations in the Loans and the Loan Documents, including this Guaranty, the Administrative Agent or any Bank may forward to each purchaser and prospective purchaser all documents and information relating to this Guaranty or to Guarantor, whether furnished by Borrower or Guarantor or otherwise, subject to the terms and conditions of the Credit Agreement.

11.Guarantor agrees, upon the written request of the Administrative Agent, to execute and deliver to the Administrative Agent, from time to time, any modification or amendment hereto or any additional instruments or documents reasonably considered necessary by the Administrative Agent or its counsel to cause this Guaranty to be, become or remain valid and effective in accordance with its terms, provided, that any such modification, amendment, additional instrument or document shall not increase Guarantor's obligation's or diminish its rights hereunder and shall be reasonably satisfactory as to form to Guarantor and to Guarantor's counsel.

12.The representations and warranties of Guarantor set forth in this Guaranty shall survive until this Guaranty shall terminate in accordance with the terms hereof.

13.This Guaranty contains the entire agreement among the parties with respect to the subject matter hereof and supersedes all prior agreements relating to such subject matter and may not be modified, amended, supplemented or discharged except by a written agreement signed by Guarantor and the Administrative Agent.

14.If all or any portion of any provision contained in this Guaranty shall be determined to be invalid, illegal or unenforceable in any respect for any reason, such provision or portion thereof shall be deemed stricken and severed from this Guaranty and the remaining provisions and portions thereof shall continue in full force and effect.

15.This Guaranty may be executed in counterparts which together shall constitute the same instrument. Delivery of an executed counterpart of this Guaranty by telecopy or other electronic means that reproduces an image of the actual executed signature page shall be effective as delivery of a manually executed counterpart of this Guaranty.

16.All notices, requests and other communications to any party hereunder shall be in writing (including bank wire, facsimile transmission followed by telephonic confirmation or similar writing) and shall be, addressed to such party at the address set forth below or to such other address as may be identified by any party in a written notice to the others:

If to Guarantor: Kilroy Realty Corporation

12200 West Olympic Boulevard, Suite 200

Los Angeles, California 90064

Attn: Tyler Rose and Michelle Ngo

Telecopy: (310) 481-6580

With Copies of

Notices to

Guarantor to: Latham & Watkins LLP

355 South Grand Avenue

Los Angeles, California 90071

Attn: Glen B. Collyer, Esq.

Telecopy: (213) 891-8763

If to the Administrative

Agent:

JPMorgan Chase Bank, N.A.

383 Madison Avenue, 24th Floor

New York, NY 10179

Attn: Marc Costantino

Telecopy number: (212) 270-2157

With Copies of

Notices to the

Administrative

Agent to:

JPMorgan Chase Bank, N.A.

1111 Fannin, 10th Floor

Houston, Texas 77002

Attn: Loan and Agency Services

Telecopy number: (713) 750-2892

and to: Bingham McCutchen LLP

1 Federal Street

Boston, Massachusetts 02110

Attn: Stephen Miklus, Esq.

Telecopy: (617) 428-6387

Each such notice, request or other communication shall be effective (i) if given by facsimile transmission, when such facsimile is transmitted to the facsimile number specified in this Section and the appropriate answerback or facsimile confirmation is received, (ii) if given by certified registered mail, return receipt requested, with first class postage prepaid, addressed as aforesaid, upon receipt or refusal to accept delivery, (iii) if given by a nationally recognized overnight carrier, 24 hours after such communication is deposited with such carrier with postage prepaid for next day delivery, or (iv) if given by any other means, when delivered at the address specified in this Section.

17.Any acknowledgment or new promise, whether by payment of principal or interest or otherwise by Borrower or Guarantor, with respect to the Guaranteed Obligations shall, if the statute of limitations in favor of Guarantor against the Administrative Agent shall have commenced to run, toll the running of such statute of limitations, and if the period of such statute of limitations shall have expired, prevent the operation of such statute of limitations.

18.This Guaranty shall be binding upon Guarantor and its successors and assigns and shall inure to the benefit of the Administrative Agent and the Banks and their successors and permitted assigns; provided that the Guarantor may not assign or transfer its rights or obligations under this Guaranty.

19.The failure of the Administrative Agent to enforce any right or remedy hereunder, or promptly to enforce any such right or remedy, shall not constitute a waiver thereof, nor give rise to any estoppel against the Administrative Agent, nor excuse Guarantor from its obligations hereunder. Any waiver

of any such right or remedy to be enforceable against the Administrative Agent must be expressly set forth in a writing signed by the Administrative Agent.

20.(a)THIS GUARANTY AND THE RIGHTS AND OBLIGATIONS OF THE PARTIES HEREUNDER SHALL BE CONSTRUED IN ACCORDANCE WITH AND BE GOVERNED BY THE LAWS OF THE STATE OF NEW YORK.

(a)Any legal action or proceeding with respect to this Guaranty and any action for enforcement of any judgment in respect thereof may be brought in the courts of the State of New York or of the United States of America for the Southern District of New York, and, by execution and delivery of this Guaranty, the Guarantor hereby accepts for itself and in respect of its property, generally and unconditionally, the non-exclusive jurisdiction of the aforesaid courts and appellate courts from any thereof. The Guarantor irrevocably consents to the service of process out of any of the aforementioned courts in any such action or proceeding by the mailing of copies thereof by registered or certified mail, postage prepaid, to the Guarantor at its address for notices set forth herein. The Guarantor hereby irrevocably waives, to the fullest extent permitted by law, any objection which it may now or hereafter have to the laying of venue of any of the aforesaid actions or proceedings arising out of or in connection with this Guaranty brought in the courts referred to above and hereby further irrevocably waives, to the fullest extent permitted by law, and agrees not to plead or claim in any such court that any such action or proceeding brought in any such court has been brought in an inconvenient forum. Nothing herein shall affect the right of the Administrative Agent to serve process in any other manner permitted by law or to commence legal proceedings or otherwise proceed against the Guarantor in any other jurisdiction.

(b)GUARANTOR HEREBY WAIVES ITS RIGHTS TO A JURY TRIAL OF ANY AND ALL CLAIMS OR CAUSES OF ACTION BASED UPON OR ARISING OUT OF THIS GUARANTY. IT IS HEREBY ACKNOWLEDGED BY GUARANTOR THAT THE WAIVER OF A JURY TRIAL IS A MATERIAL INDUCEMENT FOR THE ADMINISTRATIVE AGENT TO ACCEPT THIS GUARANTY AND THAT THE LOANS MADE BY THE BANKS ARE MADE IN RELIANCE UPON SUCH WAIVER. GUARANTOR FURTHER WARRANTS AND REPRESENTS THAT SUCH WAIVER HAS BEEN KNOWINGLY AND VOLUNTARILY MADE, FOLLOWING CONSULTATION WITH LEGAL COUNSEL. IN THE EVENT OF LITIGATION, THIS GUARANTY MAY BE FILED BY THE ADMINISTRATIVE AGENT IN COURT AS A WRITTEN CONSENT TO A NON-JURY TRIAL.

(c)Guarantor does hereby further covenant and agree to and with the Administrative Agent that Guarantor may be joined in any action against Borrower in connection with the Loan Documents and that recovery may be had against Guarantor in such action or in any independent action against Guarantor (with respect to the Guaranteed Obligations), without the Administrative Agent first pursuing or exhausting any remedy or claim against Borrower or its successors or assigns. Guarantor also agrees that, in an action brought with respect to the Guaranteed Obligations in any jurisdiction, it shall be conclusively bound by the judgment in any such action by the Administrative Agent (wherever brought) against Borrower or its successors or assigns, as if Guarantor were a party to such action, even though Guarantor was not joined as parties in such action.

(d)Guarantor agrees to pay all reasonable expenses (including, without limitation, attorneys' fees and disbursements) which may be incurred by the Administrative Agent or the Banks in connection with the enforcement of their rights under this Guaranty, whether or not suit is initiated.

21.Notwithstanding anything to the contrary contained herein, this Guaranty shall terminate and be of no further force or effect upon the full performance and payment of the Guaranteed Obligations hereunder, subject to the provisions of Section 6 hereof. Upon termination of this Guaranty in accordance with the terms of this Guaranty, the Administrative Agent promptly shall deliver to Guarantor such documents as Guarantor or Guarantor's counsel reasonably may request in order to evidence such termination.

22.All of the Administrative Agent's rights and remedies under each of the Loan Documents or under this Guaranty are intended to be distinct, separate and cumulative and no such right or remedy therein or herein mentioned is intended to be in exclusion of or a waiver of any other right or remedy available to the Administrative Agent.

[Signature Pages to Follow]

IN WITNESS WHEREOF, the parties hereto have executed and delivered this Amended and Restated Guaranty of Payment as of the date and year first above written.

GUARANTOR:

KILROY REALTY CORPORATION

By: /s/ Tyler H. Rose

Name: Tyler H. Rose

Title:   Executive Vice President and

            Chief Financial Officer

By: /s/ Michelle Ngo

Name: Michelle Ngo

Title:   Vice President and Treasurer

ACCEPTED:

JPMORGAN CHASE BANK, N.A.

as Administrative Agent

By: /s/ Marc Costantino

Name: Marc Costantino

Title: Executive Director

EX-12.1

Exhibit 12.1

KILROY REALTY CORPORATION

Statement of Computation of Ratio of Earnings to Fixed Charges

(in thousands, except ratios)

	Year Ended December 31,
	2012			2011			2010			2009			2008
Earnings:
Income (loss) from continuing operations	$	5,447		$	(3,728	)	$	(427	)	$	15,569		$	28,181
Plus Fixed Charges:
Interest expense (including amortization of loan costs)	79,114			89,409			59,941			46,119			45,346
Capitalized interest and loan costs	19,792			9,130			10,015			9,683			18,132
Estimate of interest within rental expense	3,475			1,481			997			871			871
Distributions on Cumulative Redeemable Preferred units	3,541			5,588			5,588			5,588			5,588
Fixed Charges	105,922			105,608			76,541			62,261			69,937
Plus: Amortization of capitalized interest (1)	5,318			4,622			4,348			4,067			3,669
Less: Capitalized interest and loan costs	(19,792		)	(9,130		)	(10,015		)	(9,683		)	(18,132		)
Less: Distributions on Cumulative Redeemable Preferred units	(3,541		)	(5,588		)	(5,588		)	(5,588		)	(5,588		)
Earnings	93,354			91,784			64,859			66,626			78,067
Combined Fixed Charges and Preferred Dividends:
Fixed Charges (from above)	105,922			105,608			76,541			62,261			69,937
Preferred Dividends	10,567			9,608			9,608			9,608			9,608
Combined Fixed Charges and Preferred Dividends	$	116,489		$	115,216		$	86,149		$	71,869		$	79,545
Consolidated ratio of earnings to fixed charges	0.88x			0.87x			0.85x			1.07x			1.12x
Consolidated ratio of earnings to combined fixed charges and preferred dividends	0.80x			0.80x			0.75x			0.93x			0.98x
Deficiency	$	23,135		$	23,432		$	21,290		$	5,243		$	1,478

________________________

(1) Amount represents an estimate of capitalized interest that has been amortized each year based on our established depreciation policy and an analysis of total interest costs and loan costs capitalized since 1997.

We have computed the ratio of earnings to fixed charges by dividing earnings by fixed charges. Earnings consist of income from continuing operations before the effect of noncontrolling interest plus fixed charges and amortization of capital interest, reduced by capitalized interest and loan costs and distributions on cumulative redeemable preferred units. Fixed charges consist of interest costs, whether expensed or capitalized, amortization of loan costs, an estimate of the interest within rental expense, and distributions on cumulative redeemable preferred units.

We have computed the consolidated ratio of earnings to combined fixed charges and preferred dividends by dividing earnings by combined fixed charges and preferred dividends. Earnings consist of income from continuing operations before the effect of noncontrolling interest plus fixed charges and amortization of capitalized interest, reduced by capitalized interest and loan costs and distributions on Series A cumulative redeemable preferred units. Fixed charges consist of interest costs, whether expensed or capitalized, amortization of loan costs, an estimate of the interest within rental expense, and distributions on Series A cumulative redeemable preferred units.

EX-12.2

Exhibit 12.2

KILROY REALTY, L.P.

Statement of Computation of Ratio of Earnings to Fixed Charges

(in thousands, except ratios)

	Year Ended December 31,
	2012			2011			2010			2009			2008
Earnings:
Income (loss) from continuing operations	$	5,447		$	(3,728	)	$	(427	)	$	15,569		$	28,181
Plus Fixed Charges:
Interest expense (including amortization of loan costs)	79,114			89,409			59,941			46,119			45,346
Capitalized interest and loan costs	19,792			9,130			10,015			9,683			18,132
Estimate of interest within rental expense	3,475			1,481			997			871			871
Fixed Charges	102,381			100,020			70,953			56,673			64,349
Plus: Amortization of capitalized interest (1)	5,318			4,622			4,348			4,067			3,669
Less: Capitalized interest and loan costs	(19,792		)	(9,130		)	(10,015		)	(9,683		)	(18,132		)
Earnings	$	93,354		$	91,784		$	64,859		$	66,626		$	78,067
Ratio of earnings to fixed charges	0.91		x	0.92		x	0.91		x	1.18		x	1.21		x

________________________

(1) Amount represents an estimate of capitalized interest that has been amortized each year based on our established depreciation policy and an analysis of total interest costs and loan costs capitalized since 1997.

We have computed the ratio of earnings to fixed charges by dividing earnings by fixed charges. Earnings consist of income from continuing operations before the effect of noncontrolling interest plus fixed charges and amortization of capital interest and reduced by capitalized interest and loan costs. Fixed charges consist of interest costs, whether expensed or capitalized, amortization of loan costs and an estimate of the interest within rental expense.

EX-21.1

Exhibit 21.1

SUBSIDIARIES OF KILROY REALTY CORPORATION

NAME OF SUBSIDIARY OR ORGANIZATION	STATE OF INCORPORATION OR FORMATION
Kilroy Realty, L.P.	Delaware
Kilroy Realty Finance, Inc.	Delaware
Kilroy Realty Finance Partnership, L.P.	Delaware
Kilroy Services, LLC	Delaware
Kilroy Realty TRS, Inc.	Delaware
Kilroy Realty Management, L.P.	Delaware
Kilroy RB, LLC	Delaware
Kilroy RB II, LLC	Delaware
Kilroy Realty 303, LLC	Delaware
KR Westlake Terry, LLC	Delaware
KR 6255 Sunset, LLC	Delaware
KR MML 12701, LLC	Delaware
KR 690 Middlefield, LLC	Delaware
KR Lakeview, LLC	Delaware
KR Tribeca West, LLC	Delaware
KR 331 Fairchild, LLC	Delaware
KR Hollywood, LLC	Delaware
KR 350 Mission, LLC	Delaware
Fremont Lake Union, LLC	Delaware
KR Mathilda Escrow, LLC	Delaware

EX-21.2

Exhibit 21.2

SUBSIDIARIES OF KILROY REALTY, L.P.

NAME OF SUBSIDIARY OR ORGANIZATION	STATE OF INCORPORATION OR FORMATION
Kilroy Realty Finance Partnership, L.P.	Delaware
Kilroy Services, LLC	Delaware
Kilroy Realty TRS, Inc.	Delaware
Kilroy Realty Management, L.P.	Delaware
Kilroy RB, LLC	Delaware
Kilroy RB II, LLC	Delaware
Kilroy Realty 303, LLC	Delaware
KR Westlake Terry, LLC	Delaware
KR 6255 Sunset, LLC	Delaware
KR MML 12701, LLC	Delaware
KR 690 Middlefield, LLC	Delaware
KR Lakeview, LLC	Delaware
KR Tribeca West, LLC	Delaware
KR 331 Fairchild, LLC	Delaware
KR Hollywood, LLC	Delaware
KR 350 Mission, LLC	Delaware
Fremont Lake Union, LLC	Delaware
KR Mathilda Escrow, LLC	Delaware

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement Nos. 333-172560, 333-165117, and 333-153583 on Forms S-3 and Registration Statement Nos. 333-43227, 333-77739, 333-135385, 333-161954 and 333-167452 on Forms S-8 of our reports dated February 11, 2013, relating to the financial statements and financial statement schedules of Kilroy Realty Corporation and the effectiveness of Kilroy Realty Corporation's internal control over financial reporting, appearing in this Annual Report on Form 10-K of Kilroy Realty Corporation for the year ended December 31, 2012.

/s/ DELOITTE & TOUCHE, LLP

Los Angeles, California

February 11, 2013

EX-23.2

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in Registration Statement No. 333-172560-01 on Form S-3 of our reports dated February 11, 2013, relating to the financial statements and financial statement schedules of Kilroy Realty, L.P. and the effectiveness of Kilroy Realty, L.P.'s internal control over financial reporting, appearing in this Annual Report on Form 10-K of Kilroy Realty, L.P. for the year ended December 31, 2012.

/s/ DELOITTE & TOUCHE, LLP

Los Angeles, California

February 11, 2013

EX-31.1

Exhibit 31.1

Certification of Chief Executive Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, John B. Kilroy, Jr., certify that:

1. I have reviewed this annual report on Form 10-K of Kilroy Realty Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's Board of Directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ John B. Kilroy, Jr.

John B. Kilroy, Jr.

President and Chief Executive Officer

Date: February 11, 2013

EX-31.2

Exhibit 31.2

Certification of Chief Financial Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002

I, Tyler H. Rose, certify that:

1. I have reviewed this annual report on Form 10-K of Kilroy Realty Corporation;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's Board of Directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ Tyler H. Rose

Tyler H. Rose

Executive Vice President and

Chief Financial Officer

Date: February 11, 2013

EX-31.3

Exhibit 31.3

Certification of Chief Executive Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of

2002

I, John B. Kilroy, Jr., certify that:

1. I have reviewed this annual report on Form 10-K of Kilroy Realty, L.P. ;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's Board of Directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ John B. Kilroy, Jr.

John B. Kilroy, Jr.

President and Chief Executive Officer

Kilroy Realty Corporation, sole general partner of

Kilroy Realty, L.P.

Date: February 11, 2013

EX-31.4

Exhibit 31.4

Certification of Chief Financial Officer

Pursuant to Section 302 of the Sarbanes-Oxley Act of

2002

I, Tyler H. Rose, certify that:

1. I have reviewed this annual report on Form 10-K of Kilroy Realty, L.P. ;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant's other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant's internal control over financial reporting; and

5. The registrant's other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's auditors and the audit committee of the registrant's Board of Directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant's ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over financial reporting.

/s/ Tyler H. Rose

Tyler H. Rose

Executive Vice President and

Chief Financial Officer

Kilroy Realty Corporation, sole general partner of

Kilroy Realty, L.P.

Date: February 11, 2013

EX-32.1

Exhibit 32.1

Certification of Chief Executive Officer

Pursuant to 18 U.S.C. § 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned officer of Kilroy Realty Corporation (the “Company”) hereby certifies, to his knowledge, that:

(i) the accompanying Annual Report on Form 10-K of the Company for the year ended December 31, 2012 (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ John B. Kilroy, Jr.

John B. Kilroy, Jr.

President and Chief Executive Officer

Date: February 11, 2013

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350, is not being filed as part of the Report or as a separate disclosure document, and is not being incorporated by reference into any filing of the Company or Kilroy Realty, L.P. under the Securities Act of 1933, as amended, or the Securities Act of 1934, as amended, (whether made before or after the date of the Report) irrespective of any general incorporation language contained in such filing. The signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

Certification of Chief Financial Officer

Pursuant to 18 U.S.C. § 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned officer of Kilroy Realty Corporation (the “Company”) hereby certifies, to his knowledge, that:

(i) the accompanying Annual Report on Form 10-K of the Company for the year ended December 31, 2012 (the “Report”) fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Tyler H. Rose

Tyler H. Rose

Executive Vice President and

Chief Financial Officer

Date: February 11, 2013

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350, is not being filed as part of the Report or as a separate disclosure document, and is not being incorporated by reference into any filing of the Company or Kilroy Realty, L.P. under the Securities Act of 1933, as amended, or the Securities Act of 1934, as amended, (whether made before or after the date of the Report) irrespective of any general incorporation language contained in such filing. The signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.3

Exhibit 32.3

Certification of Chief Executive Officer

Pursuant to 18 U.S.C. § 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned officer of Kilroy Realty Corporation, the sole general partner of Kilroy Realty, L.P. (the "Operating Partnership"), hereby certifies, to his knowledge, that:

(i) the accompanying Annual Report on Form 10-K of the Operating Partnership for the year ended December 31, 2012 (the "Report") fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership.

/s/ John B. Kilroy, Jr.

John B. Kilroy, Jr.

President and Chief Executive Officer

Kilroy Realty Corporation, sole general partner of

Kilroy Realty, L.P.

Date: February 11, 2013

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350, is not being filed as part of the Report or as a separate disclosure document, and is not being incorporated by reference into any filing of Kilroy Realty Corporation or the Operating Partnership under the Securities Act of 1933, as amended, or the Securities Act of 1934, as amended, (whether made before or after the date of the Report) irrespective of any general incorporation language contained in such filing. The signed original of this written statement required by Section 906 has been provided to the Operating Partnership and will be retained by the Operating Partnership and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.4

Exhibit 32.4

Certification of Chief Financial Officer

Pursuant to 18 U.S.C. § 1350, as created by Section 906 of the Sarbanes-Oxley Act of 2002, the undersigned officer of Kilroy Realty Corporation, the sole general partner of Kilroy Realty, L.P. (the "Operating Partnership"), hereby certifies, to his knowledge, that:

(i) the accompanying Annual Report on Form 10-K of the Operating Partnership for the year ended December 31, 2012 (the "Report") fully complies with the requirements of Section 13(a) or Section 15(d), as applicable, of the Securities Exchange Act of 1934, as amended; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Operating Partnership.

/s/ Tyler H. Rose

Tyler H. Rose

Executive Vice President and

Chief Financial Officer

Kilroy Realty Corporation, sole general partner of

Kilroy Realty, L.P.

Date: February 11, 2013

The foregoing certification is being furnished solely pursuant to 18 U.S.C. § 1350, is not being filed as part of the Report or as a separate disclosure document, and is not being incorporated by reference into any filing of Kilroy Realty Corporation or the Operating Partnership under the Securities Act of 1933, as amended, or the Securities Act of 1934, as amended, (whether made before or after the date of the Report) irrespective of any general incorporation language contained in such filing. The signed original of this written statement required by Section 906 has been provided to the Operating Partnership and will be retained by the Operating Partnership and furnished to the Securities and Exchange Commission or its staff upon request.

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Pro Forma Results of the Company

12 Months Ended

Dec. 31, 2012

Business Combinations [Abstract]

Pro Forma Results of the Company

Pro Forma Results of the Company (Unaudited)

The first table of pro forma consolidated results of operations of the Company for the years ended December 31, 2012 and 2011 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011. The second table of pro forma consolidated results of operations of the Company for the years ended December 31, 2011 and 2010 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011 and that the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, were completed as of January 1, 2010. Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2011 and 2010, respectively, nor does it intend to be a projection of future results.

	Year EndedDecember 31,
	2012		2011
	(in thousands except per share amounts)
Revenues from continuing operations	$	414,813	$	363,815
Net income available to common stockholders(1)(3)	$	238,947	$	42,601
Net income available to common stockholders per share - basic(1)(3)	$	3.41	$	0.73
Net income available to common stockholders per share - diluted(1)(3)	$	3.41	$	0.73

	Year EndedDecember 31,
	2011		2010
	(in thousands except per share amounts)
Revenues from continuing operations	$	377,871	$	283,941
Net income available to common stockholders(1)(2)(3)	$	41,293	$	2,491
Net income available to common stockholders per share - basic(1)(2)(3)	$	0.71	$	0.03
Net income available to common stockholders per share - diluted(1)(2)(3)	$	0.71	$	0.03

_________________

(1) The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisition of 4100-4700 Bohannon Drive, Menlo Park, CA , 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

(2) The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

(3) The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to common stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

The following table summarizes the results of operations for the properties at 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, from February 29, 2012, July 24, 2012 and December 17, 2012, the dates of acquisition, respectively, through December 31, 2012:

	(in thousands)
Revenues	$	18,943
Net income(1)	$	3,412

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

The following table summarizes the results of operations for the properties at 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, from June 3, 2011 and September 15, 2011, the dates of acquisition, respectively, through December 31, 2011:

	(in thousands)
Revenues	$	15,150
Net income(1)	$	397

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

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Pro Forma Results of the Operating Partnership (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	10 Months Ended	12 Months Ended			10 Months Ended	12 Months Ended																					7 Months Ended		12 Months Ended	7 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member]	Dec. 31, 2010 Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Pro Forma 2012 Material Acquisitions [Member]	Dec. 31, 2012 Pro Forma 2012 Material Acquisitions [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Pro Forma Information Including 2011 Acquisitions [Member]		Dec. 31, 2011 Pro Forma Information Including 2011 Acquisitions [Member]		Dec. 31, 2012 Pro Forma Information Including 2011 Acquisitions [Member] Kilroy Realty, L.P. [Member]		Dec. 31, 2011 Pro Forma Information Including 2011 Acquisitions [Member] Kilroy Realty, L.P. [Member]		Dec. 31, 2011 Pro Forma Information Including 2011 and 2010 Acquisitions [Member]		Dec. 31, 2010 Pro Forma Information Including 2011 and 2010 Acquisitions [Member]		Dec. 31, 2011 Pro Forma Information Including 2011 and 2010 Acquisitions [Member] Kilroy Realty, L.P. [Member]		Dec. 31, 2010 Pro Forma Information Including 2011 and 2010 Acquisitions [Member] Kilroy Realty, L.P. [Member]		Dec. 31, 2011 Pro Forma 2011 Material Acquisitions [Member]		Dec. 31, 2011 Pro Forma 2011 Material Acquisitions [Member]	Dec. 31, 2011 Pro Forma 2011 Material Acquisitions [Member] Kilroy Realty, L.P. [Member]		Dec. 31, 2011 Pro Forma 2011 Material Acquisitions [Member] Kilroy Realty, L.P. [Member]
Pro Forma Results of the Operating Partnership
Revenues											$ 414,813		$ 363,815		$ 414,813		$ 363,815		$ 377,871		$ 283,941		$ 377,871		$ 283,941
Net income available to common unitholders											238,947	[1],[2]	42,601	[1],[2]	244,337	[3],[4]	43,386	[3],[4]	41,293	[1],[2],[5]	2,491	[1],[2],[5]	42,039	[3],[4],[6]	2,437	[3],[4],[6]
Net income available to common unitholders per unit - basic											$ 3.41	[1],[2]	$ 0.73	[1],[2]	$ 3.40	[3],[4]	$ 0.72	[3],[4]	$ 0.71	[1],[2],[5]	$ 0.03	[1],[2],[5]	$ 0.70	[3],[4],[6]	$ 0.03	[3],[4],[6]
Net income available to common unitholders per unit - diluted											$ 3.41	[1],[2]	$ 0.73	[1],[2]	$ 3.40	[3],[4]	$ 0.72	[3],[4]	$ 0.71	[1],[2],[5]	$ 0.03	[1],[2],[5]	$ 0.70	[3],[4],[6]	$ 0.03	[3],[4],[6]
Actual results for material acquisitions
Revenues	18,943				18,943																						15,150			15,150
Net income	3,412				3,412																						397	[7]		397	[7]
Pro Forma Results of the Operating Partnership (Textuals) [Abstract]
Acquisition-related expenses		$ 4,937	$ 4,053	$ 2,248		$ 4,937	$ 4,053	$ 2,248	$ 1,000	$ 1,000																			$ 600			$ 600

[1] The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to common stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

[2] The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisition of 4100-4700 Bohannon Drive, Menlo Park, CA , 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

[3] The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

[4] The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA and 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

[5] The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

[6] The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

[7] Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

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Future Minimum Rent (Tables)

12 Months Ended

Dec. 31, 2012

Leases [Abstract]

Future contractual minimum rent under operating lease

Future contractual minimum rent under operating leases as of December 31, 2012 for future periods is summarized as follows:

Year Ending	(in thousands)
2013	$	360,592
2014	346,840
2015	306,262
2016	273,241
2017	230,299
Thereafter	641,268
Total	$	2,158,502

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Receivables (Tables)

12 Months Ended

Dec. 31, 2012

Receivables [Abstract]

Current Receivables, net

Current receivables, net is primarily comprised of contractual rents and other lease-related obligations due from tenants. The balance consisted of the following as of December 31, 2012 and 2011:

	December 31,
	2012			2011
	(in thousands)
Current receivables	$	11,801		$	10,985
Allowance for uncollectible tenant receivables	(2,581		)	(2,590		)
Current receivables, net	$	9,220		$	8,395

Deferred Rent Receivables, net

Deferred rent receivables, net consisted of the following as of December 31, 2012 and 2011:

	December 31,
	2012			2011
	(in thousands)
Deferred rent receivables	$	118,025		$	104,548
Allowance for deferred rent receivables	(2,607		)	(3,406		)
Total deferred rent receivables, net	$	115,418		$	101,142

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Acquisitions (Details Textuals) (USD $)	12 Months Ended							0 Months Ended					12 Months Ended				0 Months Ended		12 Months Ended				0 Months Ended												12 Months Ended								12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2012 Middlefield, Mountain View, CA [Member]	May 09, 2012 Middlefield, Mountain View, CA [Member]	Sep. 28, 2012 6121 Sunset Boulevard, Los Angeles, CA [Member]	Dec. 04, 2012 Fairchild Drive, 331, Mountain View, CA [Member]	Dec. 31, 2012 Mathilda, 555, Sunnyvale, CA [Member]		Dec. 31, 2012 Real Estate Acquisitions [Member] building	Dec. 31, 2011 Real Estate Acquisitions [Member] building	Dec. 31, 2011 601 108th Avenue N.E Bellevue, WA [Member]		Dec. 31, 2012 Fremont Lake Union Center Seattle WA [Member] building		Dec. 17, 2012 N. Mathilda Avenue 599 and 555, Sunnyvale, CA [Member]		Dec. 31, 2012 In-Place Leases [Member]	Dec. 31, 2012 Deferred Leasing Costs [Member]	Dec. 31, 2012 Below Market Leases [Member]	Dec. 31, 2012 Above Market Leases [Member]	Jul. 31, 2012 Kilroy Realty, L.P. [Member] 6255 Sunset Boulevard, Los Angeles, CA [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member]	Jun. 30, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.09% Mortgage Payable due August 2015 [Member] [Member] building	Oct. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.57% Mortgage Note Payable due February 2016 [Member] building	Apr. 30, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.94% Mortgage Payable due April 15, 2015 [Member]	Jul. 24, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member] building	Jul. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.23% Mortgage Payable due January 2016 [Member] building	Dec. 31, 2012 Office Properties [Member] Real Estate Acquisitions [Member] building	Dec. 31, 2011 Office Properties [Member] 601 108th Avenue N.E Bellevue, WA [Member] building	Dec. 31, 2012 Office Properties [Member] 6255 Sunset Boulevard, Los Angeles, CA [Member] building		Jul. 31, 2012 Office Properties [Member] Kilroy Realty, L.P. [Member] 6255 Sunset Boulevard, Los Angeles, CA [Member]	Dec. 31, 2012 Maximum [Member]	Dec. 31, 2011 Undeveloped Land and Construction in Progress [Member] In-Place Leases [Member]	Dec. 31, 2011 Undeveloped Land and Construction in Progress [Member] Deferred Leasing Costs [Member]	Dec. 31, 2011 Undeveloped Land and Construction in Progress [Member] Above Market Leases [Member]	Dec. 31, 2011 Deferred Leasing Costs and Acquisition-Related Intangible Assets [Member] Below Market Leases [Member]	Dec. 31, 2011 Deferred Leasing Costs and Acquisition-Related Intangible Assets [Member] Above Market Leases [Member]	Dec. 31, 2011 Above Market Leases [Member]	Dec. 31, 2012 Above Market Leases [Member]	Dec. 31, 2012 Below Market Leases [Member]	Dec. 31, 2012 Ten Year Ground Lease Extension Option [Member] Extensions	Dec. 31, 2012 Forty-Five Year Ground Lease Extension Option [Member] Extensions
Business Acquisition [Line Items]
Land under Purchase Options, Not Recorded																																			$ 27,500,000
Number of buildings											14	10			2	[1]									2	1		1	1	24	1	1	[2]
Cash and cash equivalents	3,973,000														4,000,000
Business Acquisition, Percentage of Voting Interests Acquired						100.00%
Secured debt, net (Notes 5 and 12)																									34,000,000	40,700,000	30,000,000	83,600,000	53,900,000
Initial premium on outstanding amount of secured debt																								8,900,000	1,700,000	2,700,000	1,000,000	1,400,000	3,100,000
Business Acquisition, Liabilities Assumed, Excluded from Purchase Price								2,100,000									11,800,000																	4,700,000
Business Acquisition, Cost of Acquired Entity, Cash Paid					74,500,000			18,900,000									137,600,000	[3],[4]
Business Combination, Consideration Transferred, Development Costs Paid								2,900,000									2,400,000
BusinessAcquisitionLeasingCommissionsAssumed					9,500,000
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred							1,100,000
Purchase Price Of Each Acquisition As Percentage Of Companys Assets																																			5.00%
Purchase Price of all Acquisitions as Percentage of Company Assets																																			10.00%
Number of extension options																																												3	1
Ten Year Ground Lease Extension Option	10 years
Forty-Five Year Ground Lease Extension Option	45 years
Assumed noncancellable ground lease expiration													Nov. 30, 2093
Deferred leasing costs and acquisition-related intangible assets	59,513,000	[5]	42,630,000	[6]									13,790,000	[6]					43,400,000	14,200,000	500,000	1,400,000														27,400,000	8,500,000	6,800,000	18,700,000	5,200,000
Weighted average amortization period in years																			4 years 8 months 0 days	3 years 5 months 6 days	59 years 7 months 6 days	3 years 9 months 12 days														3 years 9 months 0 days	2 years 6 months 0 days	4 years 6 months 0 days	3 years 11 months 0 days	82 years 6 months 0 days
Deferred revenue and acquisition-related intangible liabilities	35,020,000	[7]	23,940,000	[8]									12,850,000	[8]																												1,100,000	33,900,000
AcquiredFiniteLivedIntangibleLiabilitiesWeightedAverageUsefulLife																																									29 years 7 months 6 days		6 years 6 months 12 days
Business Acquisition, Purchase Price Allocation, Current Assets, Prepaid Expense and Other Assets															200,000
Accounts payable, accrued expenses, and other liabilities	$ 6,348,000		$ 4,515,000						$ 23,071,000	[9]			$ 2,380,000		$ 600,000
Issuance of common units in connection with an operating property acquisition	118,372																						118,372
Share Price																							$ 47.34

[1] We acquired these properties through the acquisition of the ownership interest of the bankruptcy remote LLC that owned the properties. In connection with this acquisition we also acquired cash of approximately $4.0 million and other assets of approximately $0.2 million and we assumed current liabilities of approximately $0.6 million and secured debt with an outstanding principal balance of $34.0 million and a premium of $1.7 million as a result of recording the debt at fair value at the acquisition date (see Note 7).

[2] As part of the consideration for this transaction, we issued 118,372 common units of the Operating Partnership valued at $47.34 per unit, which was the Company's closing stock price on the NYSE on the acquisition date. In connection with this acquisition we also assumed secured debt with an outstanding principal balance of $53.9 million and a premium of $3.1 million as a result of recording this debt at fair value on the acquisition date (see Note 7). We also assumed $4.7 million of accrued liabilities in connection with this acquisition that are not included in the purchase price above.

[3] Excludes acquisition-related costs and non-lease related accrued liabilities assumed. Includes assumed unpaid leasing commissions and tenant improvements.

[4] This operating property was acquired in connection with the purchase of the 555 N. Mathilda Ave. development property discussed in further detail in the "Development and Redevelopment Project Site" section of this footnote, for a total purchase price of $137.6 million. The acquisition of both the operating property and the development site in a single transaction constituted our third largest acquisition of 2012.

[5] Represents in-place leases (approximately $43.4 million with a weighted average amortization period of 4.7 years), above-market leases (approximately $1.4 million with a weighted average amortization period of 3.8 years), leasing commissions (approximately $14.2 million with a weighted average amortization period of 3.4 years), and a below-market ground lease obligation (approximately $0.5 million with a weighted average amortization period of 59.6 years).

[6] Represents below-market leases (approximately $18.7 million with a weighted average amortization period of 3.9 years) and an above-market ground lease obligation (approximately $5.2 million with a weighted average amortization period of 82.5 years), under which we are the lessee.

[7] Represents below-market leases (approximately $33.9 million with a weighted average amortization period of 6.5 years) and an above-market ground lease obligation (approximately $1.1 million with a weighted average amortization period of 29.6 years).

[8] Represents the mortgage loan, which includes an unamortized premium of approximately $1.0 million at the date of acquisition, assumed in connection with the properties acquired in April 2011 (see Note 7).

[9] In connection with this acquisition, restricted cash is being held in escrow to pay for potential environmental costs and contingent development costs. Any unused amounts will be released to the seller.

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Schedule of Contractual Expiration Dates for Ground Leases [Table Text Block]

The following table summarizes our properties that are held subject to long-term noncancellable ground lease obligations and the respective contractual expiration dates:

Property	Contractual Expiration Date(1)
601 108th Ave NE, Bellevue, Washington	November 2093
701, 801 and 837 N. 34th Street, Seattle, Washington (2)	December 2041
Kilroy Airport Center Phases I, II, and III, Long Beach, California	July 2084
360 Third Street, San Francisco, California	December 2022

____________________

(1) Reflects the contractual expiration date prior to the impact of any extension or purchase options held by the Company.

(2) The Company has three10-year and one45-year extension option for this ground lease which if exercised would extend the expiration date to December 2116.

Summary of minimum commitment

The minimum commitment under our ground leases as of December 31, 2012 for five years and thereafter was as follows:

Year Ending	(in thousands)
2013	$	3,685
2014	3,095
2015	3,095
2016	3,095
2017	3,095
Thereafter	160,007
Total(1)(2)(3)(4)(5)	$	176,072

________________________

(1) Reflects the minimum ground lease obligations before the impact of ground lease extension options.

(2) One of our ground lease obligations is subject to a fair market value adjustment every five years; however, the lease includes ground rent subprotection and infrastructure rent credits which currently limit our annual rental obligations to $1.0 million. The contractual obligations for that ground lease included above assumes the lesser of $1.0 million or annual lease rental obligation in effect as of December 31, 2012.

(3) One of our ground lease obligations includes a component which is based on the percentage of gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every five years based on 50% of the average annual percentage rent for the previous five years. Currently, gross income does not exceed the threshold requiring us to pay percentage rent. The contractual obligations for that ground lease included above assumes the annual lease rental obligation in effect as of December 31, 2012.

(4) One of our ground lease obligations is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals limited to maximum increases annually. The contractual obligations included above assumes the annual lease rental obligation in effect as of December 31, 2012.

(5) As previously discussed, the Company exercised the land purchase option included in the 360 3rd Street ground lease and will acquire the land in the second quarter of 2013. The amount presented above includes payments through the second quarter of 2013 and excludes the purchase price of $27.5 million.

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Secured and Unsecured Debt of the Operating Partnership Secured and Unsecured Debt of the Operating Partnership (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Net carrying amount	$ 1,130,895		$ 980,569
Kilroy Realty, L.P. [Member]
Debt Instrument [Line Items]
Net carrying amount	1,130,895		980,569
Kilroy Realty, L.P. [Member] | Unsecured Senior Notes [Member] | 4.80% Unsecured Senior Notes due July 15, 2018 [Member]
Debt Instrument [Line Items]
Principal amount	325,000		325,000
Unamortized discount	(413)		(486)
Net carrying amount	324,587		324,514
Maturity date	Jul. 15, 2018
Stated interest rate	4.80%	[1]
Effective interest rate	4.827%	[2]
Kilroy Realty, L.P. [Member] | Unsecured Senior Notes [Member] | 6.625% Unsecured Senior Notes due June 1, 2020 [Member]
Debt Instrument [Line Items]
Principal amount	250,000		250,000
Unamortized discount	(1,580)		(1,793)
Net carrying amount	248,420		248,207
Maturity date	Jun. 01, 2020
Stated interest rate	6.625%	[3]
Effective interest rate	6.743%	[2]
Kilroy Realty, L.P. [Member] | Unsecured Senior Notes [Member] | 5.00% Unsecured Senior Notes due Nov 3, 2015 [Member]
Debt Instrument [Line Items]
Principal amount	325,000		325,000
Unamortized discount	(112)		(152)
Net carrying amount	$ 324,888		$ 324,848
Maturity date	Nov. 03, 2015
Stated interest rate	5.00%	[4]
Effective interest rate	5.014%	[2]

[1] Interest on the 4.800% unsecured senior notes is payable semi-annually in arrears on January 15th and July 15th of each year.

[2] This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of initial issuance discounts, excluding debt issuance costs.

[3] Interest on the 6.625% unsecured senior notes is payable semi-annually in arrears on June 1st and December 1st of each year.

[4] Interest on the 5.000% unsecured senior notes is payable semi-annually in arrears on May 3rd and November 3rd of each year.

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Net Income Available to Common Stockholders Per Share of the Company (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator:
Income (loss) from continuing operations	$ 3,911	[1]	$ (665)	[1]	$ 36	[1]	$ 2,165	[1]	$ (16)	[1]	$ (3,391)	[1]	$ (1,071)	[1]	$ 750	[1]	$ 5,447	$ (3,728)	$ (427)
Loss (income) from continuing operations attributable to noncontrolling common units of the Operating Partnership																	383	545	468
Preferred dividends and distributions	(3,313)		(5,342)		(3,097)		(9,336)		(3,799)		(3,799)		(3,799)		(3,799)		(21,088)	(15,196)	(15,196)
Allocation to participating securities (nonvested shares and RSUs)																	(1,602)	(1,309)	(1,151)
Numerator for basic and diluted (loss) income from continuing operations available to common stockholders																	(16,860)	(19,688)	(16,306)
Income from discontinued operations	189,720	[1]	3,187	[1]	2,241	[1]	76,506	[1]	44,876	[1]	17,681	[1]	4,543	[1]	4,117	[1]	271,654	71,217	20,313
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership																	(6,570)	(2,019)	(646)
Numerator for basic and diluted net income (loss) available to common stockholders																	$ 248,224	$ 49,510	$ 3,361
Denominator:
Basic weighted average vested units outstanding																	69,639,623	56,717,121	49,497,487
Effect of dilutive securities - contingently issuable shares and stock options																	0	0	0
Weighted average common shares outstanding-diluted																	69,639,623	56,717,121	49,497,487
Basic earnings per share:
Loss from continuing operations available to common stockholders per common share-basic (Note 19)																	$ (0.24)	$ (0.35)	$ (0.33)
Income from discontinued operations per common share																	$ 3.80	$ 1.22	$ 0.40
Net income available to common stockholders per share-basic	$ 2.49	[2]	$ (0.04)	[2]	$ (0.02)	[2]	$ 1.06	[2]	$ 0.68	[2]	$ 0.17	[2]	$ (0.01)	[2]	$ 0.01	[2]	$ 3.56	$ 0.87	$ 0.07
Diluted earnings per share:
Loss from continuing operations available to common stockholders per common share-diluted (Note 19)																	$ (0.24)	$ (0.35)	$ (0.33)
Income from discontinued operations per common share																	$ 3.80	$ 1.22	$ 0.40
Net income available to common stockholders per share-diluted	$ 2.45	[2]	$ (0.04)	[2]	$ (0.02)	[2]	$ 1.06	[2]	$ 0.68	[2]	$ 0.17	[2]	$ (0.01)	[2]	$ 0.01	[2]	$ 3.56	$ 0.87	$ 0.07
Number of options, outstanding	1,540,000								5,000								1,540,000	5,000
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Number of RSUs outstanding	88,490																88,490

[1] All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

[2] The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding. The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

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Acquisitions (Tables)

12 Months Ended

Dec. 31, 2012

Office Properties Acquisitions [Member]

Business Acquisition [Line Items]

Acquired operating properties from unrelated third parties

Property	Acquisition	Number of Buildings	Rentable Square Feet (unaudited)	Occupancy as of December 31, 2012 (unaudited)	Purchase Price (in millions) (1)
2012 Acquisitions
4100-4700 Bohannon Drive, Menlo Park, CA	February 29, 2012	7	374,139	84.7%	$	162.5
701 and 801 N. 34th Street, Seattle, WA (3)	June 1, 2012	2	308,407	99.4%	105.4
837 N. 34th Street, Seattle, WA	June 1, 2012	1	111,580	100.0%	39.2
10900 NE 4th Street, Bellevue, WA (2)(4)	July 24, 2012	1	416,755	90.5%	186.1
6255 W. Sunset Boulevard, Los Angeles, CA (5)	July 31, 2012	1	321,883	85.2%	78.8
12233 Olympic Blvd, Los Angeles, CA (6)	October 5, 2012	1	151,029	96.8%	72.9
599 N. Mathilda Avenue, Sunnyvale, CA (2)(7)	December 17, 2012	1	75,810	100.0%	29.1
Total		14	1,759,603		$	674.0
2011 Acquisitions
250 Brannan Street, San Francisco, CA	January 28, 2011	1	92,948	100.0%	$	33.0
10210, 10220, and 10230 NE Points Drive; 3933 Lake Washington Boulevard NE, Kirkland, WA (8)	April 21, 2011	4	279,924	90.0%	100.1
10770 Wateridge Circle, San Diego, CA	May 12, 2011	1	174,310	97.5%	32.7
601 108th Avenue N.E., Bellevue, WA	June 3, 2011	1	488,470	90.4%	215.0
4040 Civic Center Drive, San Rafael, CA	June 9, 2011	1	126,787	98.1%	32.2
201 Third Street, San Francisco, CA	September 15, 2011	1	332,076	99.5%	103.3
301 Brannan Street, San Francisco, CA	November 15, 2011	1	74,430	100.0%	30.0
Total		10	1,568,945		$	546.3

________________________

(1) Excludes acquisition-related costs and non-lease related accrued liabilities assumed. Includes assumed unpaid leasing commissions and tenant improvements.

(2) As of December 31, 2012, these properties were temporarily being held in separate VIEs to facilitate potential Section 1031 Exchanges (see Note 2). The VIE was terminated subsequent to year-end.

(3) We acquired these properties through the acquisition of the ownership interest of the bankruptcy remote LLC that owned the properties. In connection with this acquisition we also acquired cash of approximately $4.0 million and other assets of approximately $0.2 million and we assumed current liabilities of approximately $0.6 million and secured debt with an outstanding principal balance of $34.0 million and a premium of $1.7 million as a result of recording the debt at fair value at the acquisition date (see Note 7).

(4) In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $83.6 million and a premium of $1.4 million as a result of recording

this debt at fair value on the acquisition date. In January 2013, we repaid this loan prior to the stated maturity (see Note 7).

(5) As part of the consideration for this transaction, we issued 118,372 common units of the Operating Partnership valued at $47.34 per unit, which was the Company's closing

stock price on the NYSE on the acquisition date. In connection with this acquisition we also assumed secured debt with an outstanding principal balance of $53.9 million and a

premium of $3.1 million as a result of recording this debt at fair value on the acquisition date (see Note 7). We also assumed $4.7 million of accrued liabilities in connection

with this acquisition that are not included in the purchase price above.

(6) In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $40.7 million and a premium of $2.7 million as a result of recording this debt at fair value on the acquisition date (see Note 7).

(7) This operating property was acquired in connection with the purchase of the 555 N. Mathilda Ave. development property discussed in further detail in the "Development and Redevelopment Project Site" section of this footnote, for a total purchase price of $137.6 million. The acquisition of both the operating property and the development site in a single transaction constituted our third largest acquisition of 2012.

(8) In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $30.0 million and an initial premium of $1.0 million as a result of recording this debt at fair value on the acquisition date (see Note 7).

Fair values of assets acquired and liabilities assumed

The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the respective acquisition dates for our 2012 and 2011 acquisitions:

2012 Acquisitions
	4100-4700 Bohannon Drive, Menlo Park, CA		10900 NE 4th Street, Bellevue, WA		599 N. Mathilda, Sunnyvale, CA		All Other Acquisitions (1)		Total
	(in thousands)
Assets
Land and improvements(2)	$	38,810	$	25,080	$	13,538	$	40,211	$	117,639
Buildings and improvements (3)	124,617		150,877		12,558		257,458		545,510
Cash and cash equivalents	—		—		—		3,973		3,973
Restricted cash	—		—		—		5,329		5,329
Deferred leasing costs and acquisition-related intangible assets (4)	9,470		16,469		3,004		30,570		59,513
Prepaid expenses and other assets	—		—		—		184		184
Total assets acquired	172,897		192,426		29,100		337,725		732,148
Liabilities
Deferred revenue and acquisition-related intangible liabilities (5)	10,380		4,940		—		19,700		35,020
Secured debt, net (6)	—		84,984		—		136,048		221,032
Accounts payable, accrued expenses and other liabilities	137		627		—		5,584		6,348
Total liabilities assumed	10,517		90,551		—		161,332		262,400
Net assets and liabilities acquired (7)	$	162,380	$	101,875	$	29,100	$	176,393	$	469,748

2011 Acquisitions
	601 108th Avenue N.E., Bellevue, WA		201 Third Street San Francisco, CA		All Other Acquisitions (1)		Total
	(in thousands)
Assets
Land and improvements (2)	$	—	$	19,260	$	42,650	$	61,910
Buildings and improvements (3)	214,095		84,018		165,995		464,108
Undeveloped land and construction in progress	—		—		2,560		2,560
Deferred leasing costs and acquisition-related intangible assets(8)	13,790		8,700		20,140		42,630
Total assets acquired	227,885		111,978		231,345		571,208
Liabilities
Deferred revenue and acquisition-related intangible liabilities(9)	12,850		8,700		2,390		23,940
Secured debt, net (10)	—		—		30,997		30,997
Accounts payable, accrued expenses, and other liabilities	2,380		76		2,059		4,515
Total liabilities assumed	15,230		8,776		35,446		59,452
Net assets and liabilities acquired (11)	$	212,655	$	103,202	$	195,899	$	511,756

________________________

(1) The purchase price of all other acquisitions during the years ended December 31, 2012 and 2011 were individually less than 5% and in aggregate less than 10% of the Company's total assets as of December 31, 2012 and 2011, respectively.

(2) In connection with the acquisitions of 701, 801, and 837 N. 34th Street, Seattle, WA, we assumed the lessee obligations under a ground lease with an initial expiration in December 2041. The ground lease obligation contains three10-year extension options and one45-year extension option. In connection with the acquisitions of 601 108th Avenue N.E., Bellevue, WA, we assumed the lessee obligation under a ground lease that is scheduled to expire in November 2093 (see Note 15 for additional information pertaining to these ground leases).

(3) Represents buildings, building improvements, and tenant improvements.

(4) Represents in-place leases (approximately $43.4 million with a weighted average amortization period of 4.7 years), above-market leases (approximately $1.4 million with a weighted average amortization period of 3.8 years), leasing commissions (approximately $14.2 million with a weighted average amortization period of 3.4 years), and a below-market ground lease obligation (approximately $0.5 million with a weighted average amortization period of 59.6 years).

(5) Represents below-market leases (approximately $33.9 million with a weighted average amortization period of 6.5 years) and an above-market ground lease obligation (approximately $1.1 million with a weighted average amortization period of 29.6 years).

(6) Represents the fair value of the mortgage loans assumed, which includes an aggregate unamortized premium balance of approximately $8.9 million at the dates of acquisition (see Note 7).

(7) Reflects the purchase price plus cash and restricted cash received, net of assumed secured debt, lease-related obligations and other accrued liabilities.

(8) Represents in-place leases (approximately $27.4 million with a weighted average amortization period of 3.8 years), above-market leases (approximately $6.8 million with a weighted average amortization period of 4.5 years years) and unamortized leasing commissions (approximately $8.5 million with a weighted average amortization period of 2.5 years).

(9) Represents below-market leases (approximately $18.7 million with a weighted average amortization period of 3.9 years) and an above-market ground lease obligation (approximately $5.2 million with a weighted average amortization period of 82.5 years), under which we are the lessee.

(10) Represents the mortgage loan, which includes an unamortized premium of approximately $1.0 million at the date of acquisition, assumed in connection with the properties acquired in April 2011 (see Note 7).

(11) Reflects the purchase price net of assumed secured debt and other lease-related obligations.

Development and Redevelopment Project Acquisitions [Member]

Business Acquisition [Line Items]

Acquired operating properties from unrelated third parties

During the years ended December 31, 2012 and 2011, we acquired seven development and redevelopment project sites from unrelated third parties. Unless otherwise noted, we funded these acquisitions with proceeds from the Company's public offering of common stock (see Note 10), disposition proceeds (see Note 17) and borrowings under the unsecured line of credit (see Note 7).

Project	Date of Acquisition	Type	Purchase Price (in millions) (1)
2012 Acquisitions
690 E. Middlefield Road, Mountain View, CA (2)(3)	May 9, 2012	Development	$	74.5
333 Brannan Street, San Francisco, CA	July 20, 2012	Development	18.5
Columbia Square, Los Angeles, CA (4)	September 28, 2012	Development and Redevelopment	65.0
350 Mission Street, San Francisco, CA	October 23, 2012	Development	52.0
331 Fairchild Drive, Mountain View, CA (2)(5)	December 4, 2012	Development	21.8
555 N. Mathilda Avenue, Sunnyvale, CA (2)(6)(7)	December 17, 2012	Development	108.5
Total			$	340.3
2011 Acquisitions
360 Third Street, San Francisco, CA	December 15, 2011	Redevelopment	$	91.5
Total			$	91.5

________________________

(1) Excludes leasing costs and/or other accrued liabilities assumed in connection with the acquisitions.

(2) Acquisition of these development sites are accounted for as business combinations because the projects were 100% pre-leased upon acquisition.

(3) The total purchase price for this acquisition was comprised of a cash purchase price of $74.5 million plus $9.5 million of assumed leasing commissions and other accrued liabilities.

(4) In connection with this acquisition we also assumed $1.1 million of other accrued liabilities which are not included in the purchase price above.

(5) The total purchase price for this acquisition was comprised of a cash purchase price of $18.9 million plus $2.9 million of development costs reimbursed to the seller. In addition, we assumed $2.1 million of leasing commissions and other accrued liabilities which are not included in the purchase price above.

(6) As of December 31, 2012, this property was temporarily being held in a separate VIE to facilitate a potential Section 1031 Exchange (see Note 2). The VIE was terminated subsequent to year-end.

(7) This development site was acquired with the purchase of the 555 Mathilda operating property for a total cash purchase price of $137.6 million plus $2.4 million of development costs reimbursed to the seller. In addition, we assumed $11.8 million of other accrued liabilities which are not included in the purchase price above.

Fair values of assets acquired and liabilities assumed

The related assets and liabilities of the acquired projects are included in the consolidated financial statements as of the date of acquisition. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the respective acquisition dates for our 2012 and 2011 development and redevelopment acquisitions:

2012 Acquisitions
	555 N. Mathilda, Sunnyvale, CA		All Other Acquisitions		Total
	(in thousands)
Assets
Undeveloped land and construction in progress	$	120,243	$	244,584	$	364,827
Restricted cash (1)	11,250		—		11,250
Prepaid expenses and other assets	—		1,300		1,300
Total assets acquired	131,493		245,884		377,377
Liabilities
Accounts payable, accrued expenses and other liabilities (1)	23,071		9,752		32,823
Total liabilities assumed	23,071		9,752		32,823
Net assets and liabilities acquired (2)	$	108,422	$	236,132	$	344,554

2011 Acquisition
	360 Third Street, San Francisco, CA
	(in thousands)
Assets
Undeveloped land and construction in progress (3)	$	89,345
Deferred leasing costs and acquisition-related intangible assets	2,930
Total assets acquired	92,275
Liabilities
Deferred revenue and acquisition-related intangible liabilities	730
Total liabilities assumed	730
Net assets and liabilities acquired	$	91,545

________________________

(1) In connection with this acquisition, restricted cash is being held in escrow to pay for potential environmental costs and contingent development costs. Any unused amounts will be released to the seller.

(2) Reflects the purchase price including assumed leasing commissions, net of assumed accrued liabilities.

(3) In connection with this acquisition we assumed the lessee obligation under a ground lease that is scheduled to expire in December 2022. We exercised the $27.5 million land purchase option, which was not included in the purchase price, during 2012 and anticipate we will close on the purchase of the land during the second quarter of 2013 (see Note 15 for additional information pertaining to this ground lease).

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Net Income Available to Common Stockholders Per Share of the Company

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Net Income Available to Common Stockholders Per Share of the Company

Net Income Available to Common Stockholders Per Share of the Company

The following table reconciles the numerator and denominator in computing the Company's basic and diluted per-share computations for net income available to common stockholders for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands, except share and per share amounts)
Numerator:
Income (loss) from continuing operations	$	5,447		$	(3,728	)	(427		)
Loss from continuing operations attributable to noncontrolling common units of the Operating Partnership	383			545			468
Preferred distributions and dividends	(21,088		)	(15,196		)	(15,196		)
Allocation to participating securities (nonvested shares and time-based RSUs)	(1,602		)	(1,309		)	(1,151		)
Numerator for basic and diluted loss from continuing operations available to common stockholders	(16,860		)	(19,688		)	(16,306		)
Income from discontinued operations	271,654			71,217			20,313
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership	(6,570		)	(2,019		)	(646		)
Numerator for basic and diluted net income available to common stockholders	$	248,224		$	49,510		$	3,361
Denominator:
Basic weighted average vested shares outstanding	69,639,623			56,717,121			49,497,487
Effect of dilutive securities—contingently issuable shares and stock options	—			—			—
Diluted weighted average vested shares and common share equivalents outstanding	69,639,623			56,717,121			49,497,487
Basic earnings per share:
Loss from continuing operations available to common stockholders per share	$	(0.24	)	$	(0.35	)	$	(0.33	)
Income from discontinued operations per common share	3.80			1.22			0.40
Net income available to common stockholders per share	$	3.56		$	0.87		$	0.07
Diluted earnings per share:
Loss from continuing operations available to common stockholders per share	$	(0.24	)	$	(0.35	)	$	(0.33	)
Income from discontinued operations per common share	3.80			1.22			0.40
Net income available to common stockholders per share	$	3.56		$	0.87		$	0.07

The impact of the contingently issuable shares, which consist of the 88,490 market measure-based RSUs and the Exchangeable Notes, and the 1,540,000 stock options, were not considered in our diluted earnings per share calculation for the year ended December 31, 2012 because we reported a loss from continuing operations attributable to common stockholders and the effect was anti-dilutive. The impact of stock options and the Exchangeable Notes during the years ended December 31, 2011 and 2010, were not considered in our diluted earnings per share calculation for the years ended December 31, 2011 and 2010 because we reported a loss from continuing operations attributable to common stockholders and the effect was anti-dilutive. See Note 7 for additional information regarding the Exchangeable Notes and Note 12 for additional information regarding the outstanding stock options and market measure-based RSUs.

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Secured and Unsecured Debt of the Operating Partnership (Details 3) (USD $)	1 Months Ended		12 Months Ended
	Nov. 30, 2012	Jun. 30, 2011	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Terms of the Credit Facility
Outstanding borrowings			$ 185,000,000		$ 182,000,000
Kilroy Realty, L.P. [Member]
Terms of the Credit Facility
Outstanding borrowings			185,000,000		182,000,000
Line of Credit [Member] | Kilroy Realty, L.P. [Member]
Terms of the Credit Facility
Outstanding borrowings			185,000,000		182,000,000
Remaining borrowing capacity			315,000,000		318,000,000
Total borrowing capacity			500,000,000	[1]	500,000,000	[1]
Interest rate			1.66%	[2]	2.05%	[2]
Facility fee - annual rate			0.30%	[3]	0.35%	[3]
Maturity date			Apr. 03, 2017	[4]	Aug. 10, 2015	[4]
Unsecured debt additional borrowing amount			200,000,000
Spread on variable rate			1.45%		1.75%
Amount Incurred In Debt Origination And Legal Costs	$ 1,900,000	$ 3,300,000					$ 5,000,000

[1] We may elect to borrow, subject to bank approval, up to an additional $200.0 million under an accordion feature under the terms of the revolving credit facility.

[2] The revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.450% and 1.750% as of December 31, 2012 and December 31, 2011, respectively.

[3] The facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we also incurred debt origination and legal costs of approximately $5.0 million when we entered into the revolving credit facility in 2010, an additional $3.3 million when we amended the terms of the revolving credit facility in June 2011 and an additional $1.9 million when we amended the terms of the revolving credit facility in November 2012. The unamortized balance of these costs are amortized through the extended maturity date of the revolving credit facility.

[4] Under the original and all amended terms of the revolving credit facility, we may exercise an option to extend the maturity date by one year.

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Receivables (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Current Receivables, net
Current receivables	$ 11,801	$ 10,985
Allowance for uncollectible tenant receivables	(2,581)	(2,590)
Current receivables, net	9,220	8,395
Deferred Rent Receivables, net
Deferred rent receivables	118,025	104,548
Allowance for deferred rent receivables	(2,607)	(3,406)
Total deferred rent receivables, net	$ 115,418	$ 101,142

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Share-Based Compensation (Details Textuals) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended													0 Months Ended	12 Months Ended	0 Months Ended		12 Months Ended
	Dec. 31, 2012 director plan	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Market Measure-Based Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Time-Based Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2010 Restricted Stock [Member]	Dec. 31, 2012 Stock Options [Member]	Dec. 31, 2012 Minimum [Member] Key Employee Share-Based Compensation Program [Member]	Dec. 31, 2012 Minimum [Member] Executive Officer Share-Based Compensation Programs [Member]	Dec. 31, 2012 Maximum [Member] Key Employee Share-Based Compensation Program [Member]	Dec. 31, 2012 Maximum [Member] Executive Officer Share-Based Compensation Programs [Member]	Mar. 30, 2012 Chief Executive Officer [Member] Restricted Stock Units (RSUs) [Member]	Dec. 31, 2012 Chief Executive Officer [Member] Restricted Stock Units (RSUs) [Member]	Mar. 30, 2012 Chief Executive Officer [Member] Market Measure-Based Restricted Stock Units (RSUs) [Member] installment	Mar. 30, 2012 Chief Executive Officer [Member] Time-Based Restricted Stock Units (RSUs) [Member] installment	Dec. 31, 2012 Common Stock [Member] Market Measure-Based Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Share-Based Incentive Compensation Plans	1
Shares Available for Grant	639,487
Maximum shares available for grant subject to full value awards	219,002
Number of Executive Compensation Committee independent directors	4
Restricted Stock Unit (RSU), Definition	1
Deferred compensation arrangement, lump sum distribution, minimum period	2 years
Service Vesting Period										2 years	1 year	5 years	5 years
Granted (in shares)					204,829	62,137	68,727	3,239						206,477	14,748
Share-based Compensation Arrangement byShare-based Payment Award, Equity Instruments Other than Options, Vesting Subject to Continued Employment, Percent														50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vesting, Number of Annual Installments																7	7
Share-based Compensation Arrangement By Share-based Payment Award, Equity Instruments Other Than Options, Grants In Period, Grant Date Fair Value																$ 4.3	$ 4.8
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Exercise Price									$ 42.61								$ 46.61
Share-based Compensation Arrangement byShare-based Payment Award, Equity Instruments Other than Options, Vesting Subject to Performance														50.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period				7 years	7 years				5 years
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period									10 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Historical Volatility, Period																		14 years
Number of shares that were tendered to satisfy minimum statutory tax withholding requirements					7,054	18,766									6,883
Granted (in shares)	1,550,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	7.3
Allocated Share-based Compensation Expense	8.5	5.6	7.4
Compensation expense previously recorded related to the Development Performance Plan			1.1
Share-based compensation cost capitalized as part of real estate assets	0.9	1.1	1.4
Total unrecognized compensation cost related to nonvested incentive awards granted	$ 25.9
Total unrecognized compensation cost weighted-average period	2 years 7 months

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Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2012

Discontinued Operations and Disposal Groups [Abstract]

Disclosure of Long Lived Assets Held-for-sale [Table Text Block]

The major classes of assets and liabilities of these properties held for sale as of December 31, 2011 were as follows:

Real estate assets and other assets held for sale	(in thousands)
Land and improvements	$	6,490
Buildings and improvements	83,447
Total real estate held for sale	89,937
Accumulated depreciation	(14,905		)
Total real estate held for sale, net	75,032
Deferred rent receivables, net	6,749
Deferred leasing costs and acquisition-related intangible assets, net	2,375
Real estate assets and other assets held for sale, net	$	84,156
Liabilities and deferred revenue of real estate assets held for sale
Accounts payable, accrued expenses and other liabilities	$	24
Deferred revenue and acquisition-related intangible liabilities, net	13,223
Rents received in advance and tenant security deposits	39
Liabilities and deferred revenue of real estate assets held for sale	$	13,286

Schedule of Property Dispositions [Table Text Block]

The following table summarizes properties sold during the years ended December 31, 2012, 2011, and 2010.

Location	Property Type	Month of Disposition	Number of Buildings	Rentable Square Feet	Sales Price (in millions) (1)
2012 Dispositions
15004 Innovation Drive and 10243 Genetic Center Drive, San Diego, CA (2)	Office	January	2	253,676	$	146.1
Industrial Portfolio (3)	Industrial	November/December	39	3,413,354
5151, 5153 & 5155 Camino Ruiz, Camarillo, CA	Office	December	4	265,372
4175 E. La Palma Avenue, Anaheim, CA	Office	December	1	43,263
Subtotal			44	3,721,989	354.2
Total			46	3,975,665	$	500.3
2011 Dispositions
10350 Barnes Canyon and 10120 Pacific Heights Drive, San Diego, CA	Office	September	2	90,558	$	23.9
2031 E. Mariposa Avenue, Los Angeles, CA	Industrial	December	1	192,053	42.2
Total			3	282,611	$	66.1
2010 Dispositions
660 N. Puente Street, Brea, CA	Industrial	October	1	51,567	$	5.0
601 Valencia Avenue, Brea, CA	Office	December	1	60,891	5.4
603 Valencia Avenue, Brea, CA	Office	December	1	45,900	5.4
Total			3	158,358	$	15.8

__________________

(1) Represents gross sales price before the impact of broker commissions and selling costs.

(2) These properties were classified as held-for-sale on the consolidated balance sheets as of December 31, 2011.

(3) The industrial portfolio was sold in two tranches in November and December 2012 to two separate third party buyers.

Components comprising income from discontinued operations

The following table summarizes the income and expense components that comprise discontinued operations for the years ended December 31, 2012, 2011 and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Revenues:
Rental income	$	22,337		$	39,226		$	39,404
Tenant reimbursements	3,902			5,502			6,330
Other property income	323			790			1,252
Total revenues	26,562			45,518			46,986
Expenses:
Property expenses	4,586			6,733			6,898
Real estate taxes	2,779			4,000			4,020
Provision for bad debts	(195		)	(137		)	(1,128		)
Depreciation and amortization	6,983			11,668			12,973
Interest expense (1)	—			3,624			4,859
Total expenses	14,153			25,888			27,622
Income from discontinued operations before net gain on dispositions of discontinued operations	12,409			19,630			19,364
Net gain on dispositions of discontinued operations	259,245			51,587			949
Total income from discontinued operations	$	271,654		$	71,217		$	20,313

__________________

(1) Interest expense relates to a $70.0 million mortgage loan that was secured by 13 of our industrial properties. The mortgage loan was repaid in October 2011 prior to maturity.

Schedule of Income from Discontinued Operations by Segment [Table Text Block]

The following table summarizes the total income from discontinued operations within the consolidated statements of operations by segment for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Office Properties	$	77,157	$	20,535	$	7,673
Industrial Properties(1)	194,497		50,682		12,640
Total income from discontinued operations	$	271,654	$	71,217	$	20,313

__________________

(1) The industrial properties were no longer a segment at December 31, 2012 because we disposed of all of our industrial properties during the fourth quarter of 2012.

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Quarterly Financial Information of the Operating Partnership (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating revenues	$ 111,111	[1]	$ 104,293	[1]	$ 97,111	[1]	$ 92,397	[1]	$ 94,226	[1]	$ 86,398	[1]	$ 81,002	[1]	$ 76,003	[1]	$ 404,912	$ 337,629	$ 254,994
Net Operating Income from continuing operations	79,276	[1],[2]	72,251	[1],[2]	68,437	[1],[2]	67,791	[1],[2]	67,777	[1],[2]	60,268	[1],[2]	56,910	[1],[2]	53,660	[1],[2]
Income (loss) from continuing operations	3,911	[1]	(665)	[1]	36	[1]	2,165	[1]	(16)	[1]	(3,391)	[1]	(1,071)	[1]	750	[1]	5,447	(3,728)	(427)
Income from discontinued operations	189,720	[1]	3,187	[1]	2,241	[1]	76,506	[1]	44,876	[1]	17,681	[1]	4,543	[1]	4,117	[1]	271,654	71,217	20,313
Net income	193,631		2,522		2,277		78,671		44,860		14,290		3,472		4,867		277,101	67,489	19,886
Net income attributable to the Operating Partnership	189,152		2,589		2,297		76,876		43,706		13,994		3,482		4,833		270,914	66,015	19,708
PREFERRED DISTRIBUTIONS	(3,313)		(5,342)		(3,097)		(9,336)		(3,799)		(3,799)		(3,799)		(3,799)		(21,088)	(15,196)	(15,196)
Net income (loss) available to common stockholders	185,839	[3]	(2,753)	[3]	(800)	[3]	67,540	[3]	39,907	[3]	10,195	[3]	(317)	[3]	1,034	[3]	249,826	50,819	4,512
Net income (loss) available to common stockholders per share—basic	$ 2.49	[3]	$ (0.04)	[3]	$ (0.02)	[3]	$ 1.06	[3]	$ 0.68	[3]	$ 0.17	[3]	$ (0.01)	[3]	$ 0.01	[3]	$ 3.56	$ 0.87	$ 0.07
Net income (loss) available to common stockholders per share—diluted	$ 2.45	[3]	$ (0.04)	[3]	$ (0.02)	[3]	$ 1.06	[3]	$ 0.68	[3]	$ 0.17	[3]	$ (0.01)	[3]	$ 0.01	[3]	$ 3.56	$ 0.87	$ 0.07
Kilroy Realty, L.P. [Member]
Operating revenues	111,111	[1]	104,293	[1]	97,111	[1]	92,397	[1]	94,226	[1]	86,398	[1]	81,002	[1]	76,003	[1]	404,912	337,629	254,994
Net Operating Income from continuing operations	79,276	[1],[2]	72,251	[1],[2]	68,437	[1],[2]	67,791	[1],[2]	67,777	[1],[2]	60,268	[1],[2]	56,910	[1],[2]	53,660	[1],[2]
Income (loss) from continuing operations	3,911	[1]	(665)	[1]	36	[1]	2,165	[1]	(16)	[1]	(3,391)	[1]	(1,071)	[1]	750	[1]	5,447	(3,728)	(427)
Income from discontinued operations	189,720	[1]	3,187	[1]	2,241	[1]	76,506	[1]	44,876	[1]	17,681	[1]	4,543	[1]	4,117	[1]	271,654	71,217	20,313
Net income	193,631		2,522		2,277		78,671		44,860		14,290		3,472		4,867		277,101	67,489	19,886
Net income attributable to the Operating Partnership	193,137		2,474		2,234		78,618		44,427		14,260		3,440		4,833		276,463	66,960	19,724
PREFERRED DISTRIBUTIONS	(3,313)		(5,342)		(3,097)		(9,336)		(3,799)		(3,799)		(3,799)		(3,799)		(21,088)	(15,196)	(15,196)
Net income (loss) available to common stockholders	$ 189,824	[2]	$ (2,868)	[2]	$ (863)	[2]	$ 69,282	[2]	$ 40,628	[2]	$ 10,461	[2]	$ (359)	[2]	$ 1,034	[2]	$ 255,375	$ 51,764	$ 4,528
Net income (loss) available to common stockholders per share—basic	$ 2.48	[2]	$ (0.04)	[2]	$ (0.02)	[2]	$ 1.05	[2]	$ 0.68	[2]	$ 0.17	[2]	$ (0.01)	[2]	$ 0.01	[2]	$ 3.56	$ 0.86	$ 0.07
Net income (loss) available to common stockholders per share—diluted	$ 2.44	[2]	$ (0.04)	[2]	$ (0.02)	[2]	$ 1.05	[2]	$ 0.68	[2]	$ 0.17	[2]	$ (0.01)	[2]	$ 0.01	[2]	$ 3.56	$ 0.86	$ 0.07

[1] All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

[2] Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

[3] The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding. The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

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Secured and Unsecured Debt of the Operating Partnership - Exchangeable Senior Notes (Details) (USD $)	12 Months Ended						1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended					12 Months Ended			12 Months Ended							12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010 Exchangeable Notes [Member] 3.25% Exchangeable Notes [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member]	Jun. 30, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.48% Mortgage Payable due July 2027	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.48% Mortgage Payable due July 2027		Jul. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member]		Jul. 24, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member] building	Jul. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.23% Mortgage Payable due January 2016 [Member] building	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.23% Mortgage Payable due January 2016 [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.57% Mortgage Note Payable due February 2016 [Member]		Oct. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.57% Mortgage Note Payable due February 2016 [Member] building	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.09% Mortgage Payable due August 2015 [Member] [Member]		Jun. 30, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.09% Mortgage Payable due August 2015 [Member] [Member] building	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] Municipal Bonds [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member]	Dec. 31, 2010 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] 3.25% Exchangeable Notes [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] 3.25% Exchangeable Notes [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] 4.25% Exchangeable Notes [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] 4.25% Exchangeable Notes [Member]
Debt Instrument [Line Items]
Number of Real Estate Properties													1	1					1			2
Balance and significant terms of the Exchangeable Notes outstanding
Principal amount																											$ 148,000,000		$ 0	$ 172,500,000	[1]	$ 172,500,000	[2]
Unamortized discount																											(924,000)		0	(8,556,000)		(12,684,000)
Net carrying amount of liability component	163,944,000	306,892,000		163,944,000	306,892,000																						147,076,000		0	163,944,000		159,816,000
Carrying amount of equity component																											33,675,000			19,835,000
Maturity date								Jul. 01, 2027	[3],[4]		Apr. 01, 2013	[3],[5]			Jan. 01, 2016	[3],[6]	Feb. 11, 2016	[3],[7]		Aug. 07, 2015	[3],[8]						Apr. 15, 2012
Stated interest rate			3.25%					4.48%	[3],[4],[9]		6.37%	[3],[5],[9]			5.23%	[3],[6],[9]	5.57%	[3],[7],[9]		5.09%	[3],[8],[9]			4.25%			3.25%	[10]	3.25%	4.25%	[10]
Effective interest rate								4.48%	[11],[3],[4],[9]		3.55%	[11],[3],[5],[9]			3.50%	[11],[3],[6],[9]	3.25%	[11],[3],[7],[9]		3.50%	[11],[3],[8],[9]						5.45%	[12]		7.13%	[12]
Exchange rate per $1,000 principal value of the Exchangeable Notes, as adjusted																														27.8307	[13]
Exchange price, as adjusted																														$ 35.93	[13]
Number of shares on which aggregate consideration to be delivered upon conversion is determined																														4,800,796	[13]
Average trading price of the company's stock	$ 45.72	$ 37.27
Fair value of the shares upon conversion if Exchangeable Notes were converted on specified date																														221,200,000	[1]	179,100,000	[2]
Excess amount of if-converted value over the principal amount																														48,700,000	[1]	6,600,000	[2]
Interest expense for the Exchangeable Notes
Contractual interest payments																								8,721,000	12,141,000	14,565,000
Amortization of discount																								5,052,000	6,928,000	7,965,000
Interest expense attributable to the Exchangeable Notes																								13,773,000	19,069,000	22,530,000
Capped call transactions
Referenced shares of common stock																											1,121,201			4,800,796	[14]
Exchange price including effect of capped calls																											$ 102.72			$ 42.81	[14]
Debt amortization period							30 years			30 years				30 years
Period of interest only payments							3 years
Principal amount													83,600,000	53,900,000					40,700,000			34,000,000
Debt premium						$ 8,900,000							$ 1,400,000	$ 3,100,000					$ 2,700,000			$ 1,700,000
Stated interest rate, minimum																							4.74%
Stated interest rate, maximum																							6.20%

[1] Although the 4.25% Exchangeable Notes were exchangeable during the three months ended December 31, 2012, no 4.25% Exchangeable Notes were exchanged during the period. The 4.25% Exchangeable Notes were not exchangeable during the remainder of the year.

[2] The 4.25% Exchangeable Notes were not exchangeable during the year ended December 31, 2011.

[3] The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.

[4] In June 2012, we obtained a mortgage loan that is secured by one office property located in Irvine, California and two office properties located in Los Angeles, California and requires monthly principal and interest payments based on a 30 year amortization period with an initial 3 years of interest only payments.

[5] In July 2012, in connection with the acquisition of one office building in Bellevue, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $83.6 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $1.4 million. The loan requires monthly principal and interest payments based on a 30 year amortization period. In January 2013, we repaid this loan prior to the stated maturity.

[6] In July 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage had a principal balance of $53.9 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $3.1 million. The loan requires monthly principal and interest payments based on a 30 year amortization period.

[7] In October 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $40.7 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium ofapproximately $2.7 million.

[8] In June 2012, in connection with the acquisition of two office buildings in Seattle, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $34.0 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium ofapproximately $1.7 million.

[9] All interest rates presented are fixed-rate interest rates.

[10] Interest on the 4.25% Exchangeable Notes is payable semi-annually in arrears on May 15th and November 15th of each year.

[11] This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of discounts/premiums, excluding debt issuance costs.

[12] The rate at which we record interest expense for financial reporting purposes, which reflects the amortization of the discounts on the Exchangeable Notes (see Note 2). This rate represents our conventional debt borrowing rate at the date of issuance.

[13] The exchange rate, exchange price, and the number of shares to be delivered upon conversion are subject to adjustment under certain circumstances including increases in our common dividends.

[14] The capped calls mitigate the dilutive impact to us of the potential exchange of all of the 4.25% Exchangeable Notes into shares of common stock.

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Stockholders' Equity of the Company Stockholders' Equity of the Company (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012		Apr. 16, 2012	Dec. 31, 2011
Accrued dividend and distributions
Accrued dividends and distributions	28,924			22,692
Summary of shares and units
Common stock	74,926,981	[1]		58,819,717	[1]
Noncontrolling common units	1,826,503			1,718,131
Common stockholders and noncontrolling unitholders [Member]
Accrued dividend and distributions
Accrued dividends and distributions	27,230			21,483
Common Stock [Member]
Accrued dividend and distributions
Accrued dividends and distributions	26,224			20,587
Capital Units [Member]
Accrued dividend and distributions
Accrued dividends and distributions	639			601
Preferred Stock [Member]
Accrued dividend and distributions
Accrued dividends and distributions	1,694			1,209
Series E Cumulative Redeemable Preferred Stock [Member]
Summary of shares and units
Preferred stock (in shares)			1,610,000	1,610,000
Series F Cumulative Redeemable Preferred Stock [Member]
Summary of shares and units
Preferred stock (in shares)			3,450,000	3,450,000
Series G Cumulative Redeemable Preferred Stock [Member]
Summary of shares and units
Preferred stock (in shares)	4,000,000
Series H Cumulative Redeemable Preferred Stock [Member]
Summary of shares and units
Preferred stock (in shares)	4,000,000
Restricted Stock Units (RSUs) [Member]
Accrued dividend and distributions
Accrued dividends and distributions	367	[2]		295	[2]
Time-Based Restricted Stock Units (RSUs) [Member]
Summary of shares and units
RSUs	1,048,863	[3]		842,675	[3]

[1] The amount includes nonvested shares.

[2] The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12)

[3] The amount includes nonvested RSUs.

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Secured and Unsecured Debt of the Operating Partnership (Details Textuals) (USD $)						12 Months Ended			12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010 3.25% Exchangeable Notes [Member] Exchangeable Notes [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Revolving Credit Facility [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member] Revolving Credit Facility [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Line of Credit [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Line of Credit [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] 3.25% Exchangeable Notes [Member] Exchangeable Notes [Member]		Dec. 31, 2010 Kilroy Realty, L.P. [Member] 3.25% Exchangeable Notes [Member] Exchangeable Notes [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] 3.25% Exchangeable Notes [Member] Exchangeable Notes [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] 6.45% Unsecured Senior Notes due Aug 4 2014 [Member] Unsecured Senior Notes [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] One Hundred Fifty Million Term Loan Facility [Member] Unsecured Term Loan [Member]
Debt Instrument [Line Items]
Fair Value Inputs, Cap Rate						6.75%	7.50%
Exchangeable note repurchased prinicipal amount															$ 150,000,000
Unsecured Debt	1,130,895,000	980,569,000		1,130,895,000	980,569,000												83,000,000	150,000,000
Effective interest rate													5.45%	[1]			6.45%
Maturity date													Apr. 15, 2012				Aug. 04, 2014	Mar. 29, 2016
Stated interest rate			3.25%					4.25%					3.25%	[2]		3.25%	6.45%
Spread on variable rate									1.45%		1.75%							1.75%
Unsecured debt additional borrowing amount									200,000,000									100,000,000
Borrowing capacity									$ 500,000,000	[3]	$ 500,000,000	[3]

[1] The rate at which we record interest expense for financial reporting purposes, which reflects the amortization of the discounts on the Exchangeable Notes (see Note 2). This rate represents our conventional debt borrowing rate at the date of issuance.

[2] Interest on the 4.25% Exchangeable Notes is payable semi-annually in arrears on May 15th and November 15th of each year.

[3] We may elect to borrow, subject to bank approval, up to an additional $200.0 million under an accordion feature under the terms of the revolving credit facility.

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Preferred and Common Units of the Operating Partnership (Details Textuals) (USD $)	12 Months Ended					1 Months Ended	12 Months Ended				12 Months Ended		12 Months Ended		1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended		12 Months Ended			0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended									1 Months Ended												0 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member]	Aug. 31, 2012 Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series E Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series E Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Series F Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series F Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series H Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Aug. 31, 2012 Series H Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Mar. 31, 2012 Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series G Cumulative Redeemable Preferred Stock [Member]	Mar. 31, 2012 Series G Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series G Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Aug. 15, 2012 Series A Preferred Units [Member]	Dec. 31, 2011 Series A Preferred Units [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series A Preferred Units [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2010 Series A Preferred Units [Member] Kilroy Realty, L.P. [Member]	Apr. 16, 2012 Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series E Cumulative Redeemable Preferred Stock [Member]	Apr. 16, 2012 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2010 Common Stock [Member]	Dec. 31, 2012 Issuance of Equity under ATM Program [Member]	Dec. 31, 2011 Issuance of Equity under ATM Program [Member]	Dec. 31, 2012 Issuance of Equity under ATM Program [Member] Common Stock [Member]	Dec. 31, 2011 Issuance of Equity under ATM Program [Member] Common Stock [Member]	Dec. 31, 2012 Issuance of Equity under ATM Program [Member] Partners Capital Common Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Issuance of Equity under ATM Program [Member] Partners Capital Common Unit [Member] Kilroy Realty, L.P. [Member]	Aug. 31, 2012 Issuance of Equity [Member]	Feb. 28, 2012 Issuance of Equity [Member]	Apr. 30, 2011 Issuance of Equity [Member]	Apr. 30, 2010 Issuance of Equity [Member]	Aug. 31, 2012 Issuance of Equity [Member] Common Stock [Member]	Feb. 28, 2012 Issuance of Equity [Member] Common Stock [Member]	Apr. 30, 2011 Issuance of Equity [Member] Common Stock [Member]	Apr. 30, 2010 Issuance of Equity [Member] Common Stock [Member]	Aug. 31, 2012 Issuance of Equity [Member] Partners Capital Common Unit [Member] Kilroy Realty, L.P. [Member]	Feb. 28, 2012 Issuance of Equity [Member] Partners Capital Common Unit [Member] Kilroy Realty, L.P. [Member]	Apr. 30, 2011 Issuance of Equity [Member] Partners Capital Common Unit [Member] Kilroy Realty, L.P. [Member]	Apr. 30, 2010 Issuance of Equity [Member] Partners Capital Common Unit [Member] Kilroy Realty, L.P. [Member]	Jul. 31, 2012 6255 Sunset Boulevard, Los Angeles, CA [Member] Kilroy Realty, L.P. [Member]
Class of Stock [Line Items]
Issuance of common units in connection with an operating property acquisition	118,372																																																118,372
Temporary Equity, Shares Outstanding																				1,500,000
Preferred stock, dividend rate						6.375%	6.375%		7.80%		7.50%		6.375%		6.875%	6.875%			6.875%		7.45%			7.80%		7.80%	7.50%		7.50%
Preferred stock issued (in shares)						4,000,000	4,000,000								4,000,000	4,000,000						1,510,000	1,510,000			1,610,000			3,450,000
Preferred units issued									1,610,000		3,450,000		4,000,000	4,000,000				4,000,000	4,000,000
Issuance of common stock, shares																														9,200,000			787,118	355,305							5,750,000	9,487,500	6,037,500	9,200,000	5,750,000	9,487,500
Net proceeds from issuance of common stock	$ 672,102,000	$ 233,312,000	$ 299,847,000																												$ 36,300,000	$ 12,800,000					$ 253,800,000	$ 382,100,000	$ 221,000,000	$ 299,800,000
Issuance of common units, units (Note 11)																																			787,118	355,305											6,037,500	9,200,000
Common units held by general partner				74,926,981	58,819,717
Common general partnership interest in operating partnership				97.60%	97.20%
Common limited partnership interest in the operating partnership				2.40%	2.80%
Common units held by limited partners	1,826,503	1,718,131		1,826,503	1,718,131
Proceeds from Issuance of Preferred Stock and Preference Stock						$ 96,200,000												$ 96,200,000
Preferred stock (in shares)							4,000,000									4,000,000					1,510,000		1,510,000	1,610,000		1,610,000	3,450,000		3,450,000
Share Price																																																	$ 47.34

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Secured and Unsecured Debt of the Operating Partnership - Exchangeable Senior Notes (Details Textuals) (USD $)	12 Months Ended							3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member]	Dec. 31, 2010 Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] D	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] Exchangeable Note Two [Member] D		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] Exchangeable Note Two [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] Exchangeable Note One [Member] D	Dec. 31, 2010 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] Exchangeable Note One [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member] Exchangeable Notes [Member] Exchangeable Note One [Member]
Debt Instrument [Line Items]
Minimum percentage of exchange price								130.00%
Minimum number of trading days closing per share price is higher than exchange price								20
Number of consecutive days trading price is less than product of closing price and exchange rate							5
Number of consecutive trading days							5
Exchangeable Notes principal amount for conversion ratio							$ 1,000
Percent of the product of the closing sale price of the common stock multiplied by the applicable exchange rate							98.00%
Number of days the Company's common stock ceases to be listed or approved for quotation							30
Number of trading days used for calculation of shares of common stock delivered for settlement												30
Exchange price, as adjusted										$ 35.93	[1]
Exchangeable note repurchased prinicipal amount													150,000,000
Repayments of Convertible Debt	148,000,000	0	0	148,000,000	0	0							151,100,000
Loss on early extinguishment of debt	0	0	4,564,000	0	0	4,564,000							4,600,000
Allocation to the equity component of cash paid upon repurchase of 3.25% Exchangeable Notes			$ 2,694,000			$ 2,694,000							$ 2,700,000
Referenced Shares Of Common Stock Under Capped Call Options								4,800,796	[2]	4,800,796	[2]			1,121,201
Exchange price including effect of capped calls								$ 42.81	[2]	$ 42.81	[2]			$ 102.72

[1] The exchange rate, exchange price, and the number of shares to be delivered upon conversion are subject to adjustment under certain circumstances including increases in our common dividends.

[2] The capped calls mitigate the dilutive impact to us of the potential exchange of all of the 4.25% Exchangeable Notes into shares of common stock.

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Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, Net
Total deferred leasing costs and acquisition-related intangible assets, net	$ 189,968		$ 155,522
Total acquisitions-related intangible liabilities, net	59,129	[1],[2]	36,587	[1],[2]
Deferred Leasing Costs [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, Net
Finite-lived intangible assets/liabilities, gross	168,087		142,652
Accumulated amortization	(61,443)		(52,974)
Finite-lived intangible assets/liabilities, net	106,644		89,678
Above-Market Leases [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, Net
Finite-lived intangible assets/liabilities, gross	27,977		28,143
Accumulated amortization	(12,180)		(8,101)
Finite-lived intangible assets/liabilities, net	15,797		20,042
In-Place Leases [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, Net
Finite-lived intangible assets/liabilities, gross	101,061		61,355
Accumulated amortization	(34,019)		(15,753)
Finite-lived intangible assets/liabilities, net	67,042		45,602
Below-Market Ground Lease Obligation [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, Net
Finite-lived intangible assets/liabilities, gross	690		200
Accumulated amortization	(205)		0
Finite-lived intangible assets/liabilities, net	485		200
Below-Market Leases [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, Net
Finite-lived intangible assets/liabilities, gross	70,486		37,582
Accumulated amortization	(17,555)		(6,158)
Finite-lived intangible assets/liabilities, net	52,931	[1]	31,424	[1]
Above-Market Ground Lease Obligation [Member]
Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, Net
Finite-lived intangible assets/liabilities, gross	6,320		5,200
Accumulated amortization	(122)		(37)
Finite-lived intangible assets/liabilities, net	$ 6,198	[1]	$ 5,163	[1]

[1] Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets.

[2] See Note 4 for additional information.

XML

Preferred and Common Units of the Operating Partnership

12 Months Ended

Dec. 31, 2012

Partners' Capital Notes [Abstract]

Preferred and Common Units of the Operating Partnership

Preferred and Common Units of the Operating Partnership

Preferred Unit Issuances

The Company issued 4,000,000 shares of its Series H Preferred Stock in August 2012 and issued 4,000,000 shares of its Series G Preferred Stock in March 2012 as discussed in Note 10. The net proceeds of approximately $96.2 million and $96.2 million were contributed by the Company to the Operating Partnership in exchange for 4,000,000 Series H Preferred Units and 4,000,000 Series G Preferred Units, respectively. The Company is the sole holder of the Series H Preferred Units and Series G Preferred Units. The terms of the Series H Preferred Units and Series G Preferred Units are substantially similar to the terms of the Series H Preferred Stock and Series G Preferred Stock, respectively, as discussed in Note 10. Distributions on the Series H Preferred Units and Series G Preferred Units are paid to the Company.

Preferred Unit Redemption

7.45% Series A Cumulative Redeemable Preferred Units

On August 15, 2012 (the "Series A Redemption Date"), the Operating Partnership redeemed all 1,500,000 outstanding units of its 7.45% Series A Cumulative Redeemable Preferred Units representing preferred limited partnership interests in the Operating Partnership ("Series A Preferred Units") as discussed in Note 9. As of December 31, 2011, all 1,500,000 Series A Preferred Units were outstanding.

7.80% Series E and 7.50% Series F Cumulative Redeemable Preferred Units

On April 16, 2012 (the "Series E and F Redemption Date"), the Company redeemed all 1,610,000 outstanding units of its 7.80% Series E Cumulative Redeemable Preferred Units ("Series E Preferred Units") and all 3,450,000 outstanding units of its 7.50% Series F Cumulative Redeemable Preferred Units ("Series F Preferred Units"). For each share of Series E and Series F Preferred Stock that was outstanding, the Company had an equivalent number of Series E Preferred Units and Series F Preferred Units outstanding with substantially similar terms as the Series E and Series F Preferred Stock. As of December 31, 2011, all 1,610,000 Series E Preferred Units and all 3,450,000 Series F Preferred Units were outstanding.

Common Units

Issuance of Common Units

In August 2012, the Company completed an underwritten public offering of 5,750,000 shares of its common stock as discussed in Note 10. The net offering proceeds of approximately $253.8 million were contributed by the Company to the Operating Partnership in exchange for 5,750,000 common units.

In July 2012, the Company issued 118,372 common units in connection with an operating property acquisition as discussed in Note 3. Each unit was valued at $47.34, which was the Company's closing stock price on the NYSE on the acquisition date.

In February 2012, the Company completed an underwritten public offering of 9,487,500 shares of its common stock as discussed in Note 10. The net offering proceeds of approximately $382.1 million were contributed by the Company to the Operating Partnership in exchange for 9,487,500 common units.

In April 2011, the Company completed an underwritten public offering of 6,037,500 shares of its common stock as discussed in Note 10. The net offering proceeds of approximately $221.0 million were contributed by the Company to the Operating Partnership in exchange for 6,037,500 common units.

In April 2010, the Company completed an underwritten public offering of 9,200,000 shares of its common stock as discussed in Note 10. The net offering proceeds of approximately $299.8 million were contributed by the Company to the Operating Partnership in exchange for 9,200,000 common units.

At-The-Market Stock Offering Program

During the year ended December 31, 2012, the Company utilized its at-the-market stock offering program to issue an aggregate of 787,118 shares of common stock as discussed in Note 10. The net offering proceeds of approximately $36.3 million were contributed by the Company to the Operating Partnership in exchange for 787,118 common units.

During the year ended December 31, 2011, the Company utilized its at-the-market stock offering program to issue an aggregate of 355,305 shares of common stock as discussed in Note 10. The net offering proceeds of approximately $12.8 million were contributed by the Company to the Operating Partnership in exchange for 355,305 common units.

Common Units Outstanding

The Company owned 74,926,981 and 58,819,717 common units representing a 97.6% and 97.2% common general partnership interest in the Operating Partnership as of December 31, 2012 and 2011, respectively. The remaining 2.4% and 2.8% common limited partnership interest as of December 31, 2012 and 2011, respectively, was owned by certain of our executive officers and directors and non-affiliate investors in the form of noncontrolling common units.Therewere 1,826,503 and 1,718,131 common units outstanding held by these investors, officers and directors as of December 31, 2012 and 2011, respectively. For a further discussion of the noncontrolling common units during the years ended December 31, 2012 and 2011, refer to Note 9.

Accrued Distributions

The following tables summarize accrued distributions for the noted common and preferred units as of December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Distributions payable to:
General partner	$	26,224	$	20,587
Common limited partners	639		601
RSU holders (1)	367		295
Total accrued distributions to common unitholders	27,230		21,483
Preferred unitholders	1,694		1,209
Total accrued distributions	$	28,924	$	22,692

______________________

(1) The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12).

	December 31,
	2012	2011
Outstanding Units:
Common units held by the general partner	74,926,981	58,819,717
Common units held by the limited partners	1,826,503	1,718,131
RSUs	1,048,863	842,675
Series E Preferred units		1,610,000
Series F Preferred units		3,450,000
Series G Preferred units	4,000,000
Series H Preferred units	4,000,000

XML

Deferred Revenue and Acquisition Related Liabilities, net Deferred Revenue and Acquisition Related Liabilities, net (Tables)

12 Months Ended

Dec. 31, 2012

Deferred Revenue [Abstract]

Deferred revenue and acquisition-related liabilities disclosure [Table Text Block]

Deferred revenue and acquisition-related liabilities, net consisted of the following at December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Deferred revenue related to tenant-funded tenant improvements	$	56,461	$	41,884
Other deferred revenue	2,314		1,310
Acquisition-related intangible liabilities, net (1)	59,129		36,587
Total	$	117,904	$	79,781

________________________

(1) See Note 4 for additional information.

Schedule of Future Amortization of Deferred Revenue [Table Text Block]

The following is the estimated amortization of deferred revenue related to tenant-funded tenant improvements as of December 31, 2012 for the next five years and thereafter:

Year Ending	(in thousands)
2013	$	10,054
2014	9,339
2015	8,255
2016	7,825
2017	6,409
Thereafter	14,579
Total	$	56,461

XML

Schedule III - Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2012

Real Estate and Accumulated Depreciation Disclosure [Abstract]

Real Estate and Accumulated Depreciation Disclosure [Text Block]

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III—REAL ESTATE AND ACCUMULATED DEPRECIATION

December 31, 2012

	Initial Cost									Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances			Land		Buildings and Improve- ments		Costs Capitalized Subsequent to Acquisition/ Improvement		Land		Buildings and Improve- ments		Total		Accumulated Depreciation		Deprecia- tion Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	(in thousands)
Office Properties:
23925 Park Sorrento Calabasas, California	$	11,210	(5)	$	50	$	2,346	$	304	$	50	$	2,650	$	2,700	$	1,293	35	2001	(C)	11,789
23975 Park Sorrento Calabasas, California			(5)	765		17,720		5,370		765		23,090		23,855		10,909		35	2002	(C)	100,592
24025 Park Sorrento Calabasas, California			(5)	845		15,896		3,716		845		19,612		20,457		9,913		35	2000	(C)	102,264
26541 Agoura Road Calabasas, California				1,979		9,630		9,798		1,979		19,428		21,407		9,765		35	1997	(A)	90,156
2240 E. Imperial Highway El Segundo, California				1,044		11,763		23,715		1,048		35,474		36,522		17,379		35	1983	(C)	122,870
2250 E. Imperial Highway El Segundo, California				2,579		29,062		23,009		2,547		52,103		54,650		40,489		35	1983	(C)	298,728
2260 E. Imperial Highway El Segundo, California				2,518		28,370		19,134		2,547		47,475		50,022		895		35	1983	(C)	298,728
909 Sepulveda Boulevard El Segundo, California	68,615		(6)	3,577		34,042		39,782		3,577		73,824		77,401		20,802		35	2005	(C)	241,607
999 Sepulveda Boulevard El Segundo, California			(6)	1,407		34,326		10,995		1,407		45,321		46,728		13,604		35	2003	(C)	128,504
3750 Kilroy Airport Way Long Beach, California						1,941		10,248				12,189		12,189		8,305		35	1989	(C)	10,457
3760 Kilroy Airport Way Long Beach, California						17,467		8,196				25,663		25,663		19,147		35	1989	(C)	165,278
3780 Kilroy Airport Way Long Beach, California						22,319		14,561				36,880		36,880		29,000		35	1989	(C)	219,745
3800 Kilroy Airport Way Long Beach, California						19,408		16,641				36,049		36,049		18,072		35	2000	(C)	192,476
3840 Kilroy Airport Way Long Beach, California						13,586		10,353				23,939		23,939		12,394		35	1999	(C)	136,026
3880 Kilroy Airport Way Long Beach, California						9,704		5,676				15,380		15,380		225		35	1997	(A)	(14	)
3900 Kilroy Airport Way Long Beach, California						12,615		8,264				20,879		20,879		10,966		35	1997	(A)	126,840
Kilroy Airport Center, Phase IV Long Beach, California(4)								2,087				2,087		2,087		2,087		35
12100 W. Olympic Boulevard Los Angeles, California				352		45,611		15,401		9,633		51,731		61,364		15,325		35	2003	(C)	150,167
12200 W. Olympic Boulevard Los Angeles, California				4,329		35,488		15,145		3,977		50,985		54,962		26,198		35	2000	(C)	150,302
12233 W. Olympic Boulevard Los Angeles, California	40,523		(7)	22,100		53,170		428		22,100		53,598		75,698		415		35	2012	(A)	151,029
12312 W. Olympic Boulevard Los Angeles, California				3,325		12,202		714		3,399		12,842		16,241		5,703		35	1997	(A)	78,000
6255 W. Sunset Boulevard Los Angeles, California	53,554		(8)	18,111		60,320		3,948		18,111		64,268		82,379		1,380		35	2012	(A)	321,883
1633 26th Street Santa Monica, California				2,080		6,672		3,147		2,040		9,859		11,899		4,889		35	1997	(A)	44,915
2100/2110 Colorado Avenue Santa Monica, California	97,000		(9)	5,474		26,087		13,114		5,476		39,199		44,675		13,927		35	1997	(A)	102,864
3130 Wilshire Boulevard Santa Monica, California				8,921		6,579		10,413		9,188		16,725		25,913		9,513		35	1997	(A)	88,339
501 Santa Monica Boulevard Santa Monica, California				4,547		12,044		6,427		4,551		18,467		23,018		9,456		35	1998	(A)	73,115
2829 Townsgate Road Thousand Oaks, California				5,248		8,001		5,585		5,248		13,586		18,834		7,221		35	1997	(A)	81,067
12225 El Camino Real Del Mar, California				1,700		9,633		2,992		1,683		12,642		14,325		4,943		35	1998	(A)	60,148
12235 El Camino Real Del Mar, California				1,507		8,543		4,495		1,530		13,015		14,545		6,375		35	1998	(A)	54,673
12340 El Camino Real Del Mar, California			(6)	4,201		13,896		7,369		4,201		21,265		25,466		6,809		35	2002	(C)	87,405
12390 El Camino Real Del Mar, California			(6)	3,453		11,981		1,263		3,453		13,244		16,697		6,840		35	2000	(C)	72,332
12348 High Bluff Drive Del Mar, California				1,629		3,096		3,451		1,629		6,547		8,176		4,413		35	1999	(C)	38,710
12400 High Bluff Drive Del Mar, California				15,167		40,497		11,609		15,167		52,106		67,273		16,183		35	2004	(C)	208,464

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III—REAL ESTATE AND ACCUMULATED DEPRECIATION—(Continued)

December 31, 2012

	Initial Cost					Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances	Land	Buildings and Improve- ments	Costs Capitalized Subsequent to Acquisition/ Improvement		Land	Buildings and Improve- ments	Total	Accumulated Depreciation	Deprecia- tion Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	(in thousands)
3579 Valley Centre Drive Del Mar, California		2,167	6,897	6,777		2,858	12,983	15,841	5,668	35	1999	(C)	52,375
3611 Valley Centre Drive Del Mar, California		4,184	19,352	15,868		5,259	34,145	39,404	15,193	35	2000	(C)	130,178
3661 Valley Centre Drive Del Mar, California		4,038	21,144	8,803		4,725	29,260	33,985	13,437	35	2001	(C)	129,752
3721 Valley Centre Drive Del Mar, California		4,297	18,967	5,692		4,254	24,702	28,956	7,612	35	2003	(C)	114,780
3811 Valley Centre Drive Del Mar, California		3,452	16,152	20,076		4,457	35,223	39,680	13,717	35	2000	(C)	112,067
6200 Greenwich Drive Governor Park, California		1,583	5,235	2,752		1,722	7,848	9,570	4,802	35	1999	(C)	71,000
6220 Greenwich Drive Governor Park, California		3,213	10,628	16,371		3,426	26,786	30,212	8,122	35	1997	(A)	141,214
15051 Avenue of Science I-15 Corridor, California		2,888	5,780	5,769		2,888	11,549	14,437	5,119	35	2002	(C)	70,617
15073 Avenue of Science I -15 Corridor, California		2,070	5,728	1,648		2,070	7,376	9,446	3,543	35	2002	(C)	46,759
15231 Avenue of Science I-15 Corridor, California		2,233	8,830	4,888		2,233	13,718	15,951	3,993	35	2005	(C)	65,638
15253 Avenue of Science I-15 Corridor, California		1,548	6,423	1,571		1,548	7,994	9,542	1,998	35	2005	(C)	37,437
15333 Avenue of Science I-15 Corridor, California		2,371	16,500	3,424		2,371	19,924	22,295	3,881	35	2006	(C)	78,880
15378 Avenue of Science I-15 Corridor, California		3,565	3,796	3,156		3,565	6,952	10,517	3,141	35	1998	(A)	68,910
15435 Innovation Drive I-15 Corridor, California		2,143	6,311	2,612		2,046	9,020	11,066	4,494	35	2000	(C)	49,863
15445 Innovation Drive I-15 Corridor, California		2,143	6,311	5,146		2,046	11,554	13,600	5,521	35	2000	(C)	51,500
13280 Evening Creek Drive South I-15 Corridor, California		3,701	8,398	2,937		3,701	11,335	15,036	1,733	35	2008	(C)	41,665
13290 Evening Creek Drive South I-15 Corridor, California		5,229	11,871	1,458		5,229	13,329	18,558	1,593	35	2008	(C)	61,176
13480 Evening Creek Drive North I-15 Corridor, California		7,997		41,733		7,997	41,733	49,730	6,852	35	2008	(C)	149,817
13500 Evening Creek Drive North I-15 Corridor, California		7,581	35,903	11,338		7,580	47,242	54,822	11,744	35	2004	(A)	147,533
13520 Evening Creek Drive North I-15 Corridor, California		7,581	35,903	12,376		7,580	48,280	55,860	12,818	35	2004	(A)	141,129
7525 Torrey Santa Fe 56 Corridor, California		2,348	28,035	4,060		2,348	32,095	34,443	6,488	35	2007	(C)	103,979
7535 Torrey Santa Fe 56 Corridor, California		2,950	33,808	5,991		2,950	39,799	42,749	8,306	35	2007	(C)	130,243
7545 Torrey Santa Fe 56 Corridor, California		2,950	33,708	8,117		2,950	41,825	44,775	9,330	35	2007	(C)	130,354
7555 Torrey Santa Fe 56 Corridor, California		2,287	24,916	3,712		2,287	28,628	30,915	5,757	35	2007	(C)	101,236
2355 Northside Drive Mission Valley, California		4,066	8,332	706		3,270	9,834	13,104	1,279	35	2010	(A)	53,610
2365 Northside Drive Mission Valley, California		7,359	15,257	(83	)	5,919	16,614	22,533	1,874	35	2010	(A)	91,260
2375 Northside Drive Mission Valley, California		3,947	8,146	188		3,175	9,106	12,281	1,172	35	2010	(A)	51,516
2385 Northside Drive Mission Valley, California		2,752	14,513	3,738		5,759	15,244	21,003	1,757	35	2010	(A)	88,795
2305 Historic Decatur Road Point Loma, California		5,240	22,220	435		5,240	22,655	27,895	1,621	35	2010	(A)	103,900
10020 Pacific Mesa Boulevard Sorrento Mesa, California		8,007	52,189	15,348		8,007	67,537	75,544	14,967	35	2007	(C)	318,000
4910 Directors Place Sorrento Mesa, California		2,240	13,039	6,548		2,240	19,587	21,827	1,906	35	2009	(C)	50,925
4921 Directors Place Sorrento Mesa, California		3,792	11,091	4,748		3,792	15,839	19,631	2,121	35	2008	(C)	56,136
4939 Directors Place Sorrento Mesa, California		2,225	12,698	4,359		2,198	17,084	19,282	7,021	35	2002	(C)	60,662
4955 Directors Place Sorrento Mesa, California		2,521	14,122	3,696		3,179	17,160	20,339	10,400	35	2000	(C)	76,246

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III—REAL ESTATE AND ACCUMULATED DEPRECIATION—(Continued)

December 31, 2012

	Initial Cost						Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances		Land	Buildings and Improve- ments	Costs Capitalized Subsequent to Acquisition/ Improvement		Land	Buildings and Improve- ments	Total	Accumulated Depreciation	Deprecia- tion Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	(in thousands)
5005 Wateridge Vista Drive Sorrento Mesa, California			3,320	5,049	2,026		3,320	7,075	10,395	3,193	35	1999	(C)	61,460
5010 Wateridge Vista Drive Sorrento Mesa, California			3,786	10,767	27,132		15,620	26,065	41,685	172	35	1999	(C)	111,318
10770 Wateridge Circle Sorrento Mesa, California			4,560	26,671	184		4,560	26,855	31,415	3,307	35	2011	(A)	174,310
6055 Lusk Avenue Sorrento Mesa, California			3,935	8,008	5,919		3,942	13,920	17,862	6,209	35	1997	(A)	93,000
6260 Sequence Drive Sorrento Mesa, California			3,206	9,803	1,291		3,212	11,088	14,300	5,205	35	1997	(A)	130,536
6290 Sequence Drive Sorrento Mesa, California			2,403	7,349	4,906		2,407	12,251	14,658	6,204	35	1997	(A)	90,000
6310 Sequence Drive Sorrento Mesa, California			2,940	4,946	190		2,941	5,135	8,076	2,689	35	2000	(C)	62,415
6340 Sequence Drive Sorrento Mesa, California			2,434	7,302	9,963		2,464	17,235	19,699	8,245	35	1998	(A)	66,400
6350 Sequence Drive Sorrento Mesa, California			4,941	14,824	(4,387	)	4,922	10,456	15,378	5,633	35	1998	(A)	132,600
10390 Pacific Center Court Sorrento Mesa, California			3,267	5,779	7,500		3,267	13,279	16,546	4,481	35	2002	(C)	68,400
10394 Pacific Center Court Sorrento Mesa, California			2,696	7,134	(782	)	1,671	7,377	9,048	3,217	35	1998	(A)	59,630
10398 Pacific Center Court Sorrento Mesa, California			1,947	5,152	1,316		1,222	7,193	8,415	2,824	35	1998	(A)	43,645
10421 Pacific Center Court Sorrento Mesa, California			2,926	7,979	21,999		2,926	29,978	32,904	11,682	35	1998	(A)	75,899
10445 Pacific Center Court Sorrento Mesa, California			2,247	5,945	567		1,809	6,950	8,759	2,911	35	1998	(A)	48,709
10455 Pacific Center Court Sorrento Mesa, California			4,044	10,701	(2,251	)	3,780	8,714	12,494	3,684	35	1998	(A)	90,000
5717 Pacific Center Boulevard Sorrento Mesa, California			2,693	6,280	4,219		2,693	10,499	13,192	2,721	35	2001	(C)	67,995
4690 Executive Drive UTC, California		(6)	1,623	7,926	2,394		1,623	10,320	11,943	5,009	35	1999	(A)	47,212
9785 Towne Center Drive UTC, California			2,722	9,932	(1,077	)	2,329	9,248	11,577	3,633	35	1999	(A)	75,534
9791 Towne Center Drive UTC, California			1,814	6,622	1,121		2,217	7,340	9,557	2,883	35	1999	(A)	50,466
8101 Kaiser Boulevard Anaheim, California			2,369	6,180	2,091		2,377	8,263	10,640	4,342	35	1997	(A)	59,790
2211 Michelson Irvine, California		(9)	9,319	82,836	1,507		9,319	84,343	93,662	7,926	35	2010	(A)	271,556
111 Pacifica Irvine, California			5,165	4,653	4,254		5,166	8,906	14,072	4,975	35	1997	(A)	67,496
999 Town & Country Orange, California			7,867	9,579	219		7,867	9,798	17,665	1,110	35	2010	(A)	98,551
4100 Bohannon Drive, Menlo Park, California			4,835	15,526	(18	)	4,835	15,508	20,343	457	35	2012	(A)	46,614
4200 Bohannon Drive, Menlo Park, California			4,798	15,406	(413	)	4,798	14,993	19,791	446	35	2012	(A)	46,255
4300 Bohannon Drive, Menlo Park, California			6,527	20,958	268		6,527	21,226	27,753	589	35	2012	(A)	62,920
4400 Bohannon Drive, Menlo Park, California			4,798	15,406	551		4,798	15,957	20,755	451	35	2012	(A)	46,255
4500 Bohannon Drive, Menlo Park, California			6,527	20,957	1,041		6,527	21,998	28,525	655	35	2012	(A)	62,920
4600 Bohannon Drive, Menlo Park, California			4,798	15,406	67		4,798	15,473	20,271	363	35	2012	(A)	46,255
4700 Bohannon Drive, Menlo Park, California			6,527	20,958	821		6,527	21,779	28,306	636	35	2012	(A)	62,920
303 Second Street San Francisco, California	135,000	(10)	63,550	154,153	18,442		63,550	172,595	236,145	17,837	35	2010	(A)	740,047
100 First Street San Francisco, California			49,150	131,238	11,188		49,150	142,426	191,576	11,851	35	2010	(A)	466,490

KILROY REALTY CORPORATION AND KILROY REALTY, L.P.

SCHEDULE III—REAL ESTATE AND ACCUMULATED DEPRECIATION—(Continued)

December 31, 2012

	Initial Cost										Gross Amounts at Which Carried at Close of Period
Property Location	Encumb- rances			Land		Buildings and Improve- ments		Costs Capitalized Subsequent to Acquisition/ Improvement			Land		Buildings and Improve- ments		Total		Accumulated Depreciation		Deprecia- tion Life (1)	Date of Acquisition (A)/ Construction (C) (2)		Rentable Square Feet (3) (unaudited)
	(in thousands)
250 Brannan Street San Francisco, California				7,630		22,770		1,252			7,630		24,022		31,652		2,215		35	2011	(A)	92,948
201 Third Street San Francisco, California				19,260		84,018		13,803			19,260		97,821		117,081		7,397		35	2011	(A)	332,893
301 Brannan Street San Francisco, California				5,910		22,450		1,008			5,910		23,458		29,368		1,065		35	2011	(A)	74,430
360 Third Street San Francisco, California								13,749			—		13,749		13,749		923		35	2011	(A)	(15	)
4040 Civic Center San Rafael, California				10,210		18,029		396			10,210		18,425		28,635		1,262		35	2011	(A)	130,237
599 Mathilda Sunnyvale, California				13,538		12,559		—			13,538		12,559		26,097		—		35	2012	(A)	75,810
601 108th Avenue Bellevue, Washington				—		214,095		1,222			—		215,317		215,317		13,857		35	2011	(A)	488,470
10900 NE 4th Street Bellevue, Washington	83,116		(11)	25,080		150,877		1,665			25,080		152,542		177,622		2,526		35	2012	(A)	416,755
10220 NE Points Drive Kirkland, Washington	28,384		(12)	2,554		12,080		402			2,554		12,482		15,036		830		35	2011	(A)	49,851
10230 NE Points Drive Kirkland, Washington			(12)	5,071		24,694		2,669			5,071		27,363		32,434		1,728		35	2011	(A)	98,982
10210 NE Points Drive Kirkland, Washington			(12)	4,336		24,187		892			4,336		25,079		29,415		1,583		35	2011	(A)	84,641
3933 Lake Washington Boulevard NE Kirkland, Washington			(12)	2,380		15,114		990			2,380		16,104		18,484		958		35	2011	(A)	46,450
15050 N.E. 36th Street Redmond, Washington				9,260		34,650		197			9,260		34,847		44,107		2,404		35	2010	(A)	122,103
837 N. 34th Street Lake Union, Washington				—		37,404		352			—		37,756		37,756		888		35	2012	(A)	111,580
701 N. 34th Street Lake Union, Washington	34,000		(13)	—		48,027		(140		)	—		47,887		47,887		1,172		35	2012	(A)	138,995
801 N. 34th Street Lake Union, Washington			(13)	—		58,537		(360		)	—		58,177		58,177		1,239		35	2012	(A)	169,412
17150 Von Karman Irvine, California				4,848		7,342		2,224			7,301		7,113		14,414		7,113		35	1997	(A)	(16	)
TOTAL OPERATING PROPERTIES	$	551,402		$	587,387	$	2,644,476	$	715,877		$	612,714	$	3,335,026	$	3,947,740	$	756,515				13,249,780
Undeveloped land and construction in progress(18)	2,517		(17)	521,633		90,512		197,509			521,633		288,021		809,654		—
TOTAL ALL PROPERTIES	$	553,919	(19)	$	1,109,020	$	2,734,988	$	913,386		$	1,134,347	$	3,623,047	$	4,757,394	$	756,515				13,249,780

__________________________

(1) The initial costs of buildings are depreciated over 35 years using a straight-line method of accounting; improvements capitalized subsequent to acquisition are depreciated over the shorter of the lease term or useful life, generally ranging from one to 20 years.

(2) Represents our date of construction or acquisition, or our predecessor, the Kilroy Group.

(3) Includes square footage from our stabilized portfolio.

(4) These costs represent infrastructure costs incurred in 1989. During the third quarter of 2009, we exercised our option to terminate the ground lease at Kilroy Airport Center, Phase IV in Long Beach, California. We had previously leased this land, which is adjacent to our Office Properties at Kilroy Airport Center, Long Beach, for potential future development opportunities.

(5) These properties secure a $11.2 million mortgage note.

(6) These properties secure a $68.6 million mortgage note.

(7) This property secures a $40.5 million mortgage note.

(8) This property secures a $53.6 million mortgage note.

(9) These properties secure a $97.0 million mortgage note.

(10) This property secures a $135.0 million mortgage note.

(11) This property secures a $83.1 million mortgage note.

(12) These properties secure a $28.4 million mortgage note.

(13) These properties secure a $34.0 million mortgage note.

(14) Excludes approximately 98,000 rentable square feet as this building was under redevelopment at December 31, 2012. A portion of the cost basis is included in "Undeveloped land and construction in progress" below.

(15) Excludes approximately 410,000 rentable square feet as this building was under redevelopment at December 31, 2012. The cost basis is included in "Undeveloped land and construction in progress" below.

(16) During the fourth quarter of 2011, we completed demolition of the industrial building on this site to prepare for the possible sale of the land, since we successfully obtained entitlements to reposition this site for residential use. Our ultimate decision to sell this site and the timing of any potential future sale will depend upon market conditions and other factors.

(17) Represents the principal balance of the public facility bonds (the “Bonds”), the proceeds from which were used to finance infrastructure improvements on one of our undeveloped land parcels. The Bonds are secured by property tax payments.

(18) Includes initial cost of 9455 Towne Center Drive, which was transferred to the future development portfolio and is included in construction in progress during the year ended December 31, 2012.

(19) Represents gross aggregate principal amount before the effect of the unamortized premium of approximately $7.2 million as of December 31, 2012.

The aggregate gross cost of property included above for federal income tax purposes approximated $4.1 billion as of December 31, 2012.

The following table reconciles the historical cost of total real estate held for investment from January 1, 2010 to December 31, 2012:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Total real estate held for investment, beginning of year	$	3,798,690		$	3,216,871		$	2,520,083
Additions during period:
Acquisitions	1,023,384			617,923			643,776
Improvements, etc.	207,345			84,736			86,754
Total additions during period	1,230,729			702,659			730,530
Deductions during period:
Cost of real estate sold	(264,533		)	(21,052		)	(17,456		)
Properties held for sale	—			(89,937		)	—
Other (1)	(7,492		)	(9,851		)	(16,286		)
Total deductions during period	(272,025		)	(120,840		)	(33,742		)
Total real estate held for investment, end of year	$	4,757,394		$	3,798,690		$	3,216,871

__________________________

(1) Related to the redevelopment property transferred to construction in progress during the year.

The following table reconciles the accumulated depreciation from January 1, 2010 to December 31, 2012:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Accumulated depreciation, beginning of year	$	742,503		$	672,429		$	605,976
Additions during period:
Depreciation of real estate	125,906			105,982			86,288
Total additions during period	125,906			105,982			86,288
Deductions during period:
Write-offs due to sale	(109,797		)	(11,152		)	(3,549		)
Properties held for sale	—			(14,905		)	—
Other (1)	(2,097		)	(9,851		)	(16,286		)
Total deductions during period	(111,894		)	(35,908		)	(19,835		)
Accumulated depreciation, end of year	$	756,515		$	742,503		$	672,429

__________________________

(1) Related to the redevelopment property transferred to construction in progress during the year.

XML

Secured and Unsecured Debt of the Operating Partnership Secured and Unsecured Debt of the Operating Partnership - Secured Debt (Details) (USD $)											12 Months Ended				1 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended					12 Months Ended				12 Months Ended				1 Months Ended	12 Months Ended				12 Months Ended					12 Months Ended					12 Months Ended					12 Months Ended				12 Months Ended				12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Secured Debt [Member] properties	Dec. 31, 2011 Secured Debt [Member] properties	Dec. 31, 2012 Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] loans		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.27% Mortgage Payable due Feb 1, 2018 [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.27% Mortgage Payable due Feb 1, 2018 [Member]		Jun. 30, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.48% Mortgage Payable due July 2027	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.48% Mortgage Payable due July 2027		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.48% Mortgage Payable due July 2027		Jul. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member]		Jul. 24, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member] building	Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.57% Mortgage Payable due August 1, 2012 [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.57% Mortgage Payable due August 1, 2012 [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.51% Mortgage Payable due February 1, 2017 [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.51% Mortgage Payable due February 1, 2017 [Member]		Jul. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.23% Mortgage Payable due January 2016 [Member] building	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.23% Mortgage Payable due January 2016 [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.23% Mortgage Payable due January 2016 [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.57% Mortgage Note Payable due February 2016 [Member]		Oct. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.57% Mortgage Note Payable due February 2016 [Member] building	Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.57% Mortgage Note Payable due February 2016 [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.09% Mortgage Payable due August 2015 [Member] [Member]		Jun. 30, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.09% Mortgage Payable due August 2015 [Member] [Member] building	Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 5.09% Mortgage Payable due August 2015 [Member] [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.94% Mortgage Payable due April 15, 2015 [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.94% Mortgage Payable due April 15, 2015 [Member]		Apr. 30, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.94% Mortgage Payable due April 15, 2015 [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.95% Mortgage Payable due August 1, 2012 [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.95% Mortgage Payable due August 1, 2012 [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 7.15% Mortgage Payable due May 1, 2017 [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] 7.15% Mortgage Payable due May 1, 2017 [Member]		Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] Public Facility Bonds [Member]		Dec. 31, 2011 Kilroy Realty, L.P. [Member] Secured Debt [Member] Public Facility Bonds [Member]		Jun. 30, 2012 Irvine, California [Member] Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.48% Mortgage Payable due July 2027 building	Jun. 30, 2012 Los Angeles, California [Member] Kilroy Realty, L.P. [Member] Secured Debt [Member] 4.48% Mortgage Payable due July 2027 building
Secured Debt
Stated interest rate											4.27%	[1]				4.48%	[1],[2],[3]				6.37%	[1],[2],[4]				5.57%	[1],[5]			6.51%	[1]				5.23%	[1],[2],[6]			5.57%	[1],[2],[7]				5.09%	[1],[2],[8]				4.94%	[1],[2]				4.95%	[1],[5]			7.15%	[1]
Effective interest rate											4.27%	[1],[9]				4.48%	[1],[2],[3],[9]				3.55%	[1],[2],[4],[9]				5.57%	[1],[5],[9]			6.51%	[1],[9]				3.50%	[1],[2],[6],[9]			3.25%	[1],[2],[7],[9]				3.50%	[1],[2],[8],[9]				4.00%	[1],[2],[9]				4.95%	[1],[5],[9]			7.15%	[1],[9]
Maturity date											Feb. 01, 2018					Jul. 01, 2027	[2],[3]				Apr. 01, 2013	[2],[4]				Aug. 01, 2012	[5]			Feb. 01, 2017					Jan. 01, 2016	[2],[6]			Feb. 11, 2016	[2],[7]				Aug. 07, 2015	[2],[8]				Apr. 15, 2015	[2]				Aug. 01, 2012	[5]			May 01, 2017
Secured Debt	$ 561,096,000	$ 351,825,000			$ 561,096,000	$ 351,825,000	$ 561,096,000	[10]	$ 351,825,000	[10]	$ 135,000,000	[10]	$ 135,000,000	[10]		$ 97,000,000	[10],[2],[3]	$ 0	[10],[2],[3]		$ 83,116,000	[10],[2],[4]		$ 0	[10],[2],[4]	$ 0	[10],[5]	$ 71,517,000	[10],[5]	$ 68,615,000	[10]	$ 69,507,000	[10]		$ 56,302,000		$ 0	[10],[2],[6]	$ 43,016,000			$ 0	[10],[2],[7]	$ 35,379,000			$ 0	[10],[2],[8]	$ 28,941,000	[10],[2]	$ 30,191,000	[10],[2]		$ 0	[10],[5]	$ 29,754,000	[10],[5]	$ 11,210,000	[10]	$ 13,294,000	[10]	$ 2,517,000	[10],[11]	$ 2,562,000	[10],[11]
Debt amortization period															30 years					30 years														30 years
Period of interest only payments															3 years
Principal amount																							83,600,000											53,900,000							40,700,000					34,000,000							30,000,000
Debt premium							8,900,000																1,400,000											3,100,000							2,700,000					1,700,000							1,000,000
Number of buildings																							1											1							1					2																				1	2
Stated interest rate, minimum																																																														4.74%
Stated interest rate, maximum																																																														6.20%
Number of properties used as collateral for secured debbt			20	18
Net book value of properties pledged as collateral for secured debt			$ 1,010,200,000	$ 567,800,000
Number of secured loans with restrictions							9
Number of secured debt							10

[1] All interest rates presented are fixed-rate interest rates.

[2] The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.

[3] In June 2012, we obtained a mortgage loan that is secured by one office property located in Irvine, California and two office properties located in Los Angeles, California and requires monthly principal and interest payments based on a 30 year amortization period with an initial 3 years of interest only payments.

[4] In July 2012, in connection with the acquisition of one office building in Bellevue, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $83.6 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $1.4 million. The loan requires monthly principal and interest payments based on a 30 year amortization period. In January 2013, we repaid this loan prior to the stated maturity.

[5] In May 2012, we repaid these loans prior to the stated maturity.

[6] In July 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage had a principal balance of $53.9 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $3.1 million. The loan requires monthly principal and interest payments based on a 30 year amortization period.

[7] In October 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $40.7 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium ofapproximately $2.7 million.

[8] In June 2012, in connection with the acquisition of two office buildings in Seattle, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $34.0 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium ofapproximately $1.7 million.

[9] This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of discounts/premiums, excluding debt issuance costs.

[10] Amounts reported include the amounts of unamortized debt premiums and discounts for the periods presented.

[11] The public facility bonds (the “Bonds”), the proceeds from which were used to finance infrastructure improvements on one of the Company’s undeveloped land parcels, were issued in February 2008 by the City of Carlsbad. The Bonds have annual maturities from September 1, 2013 through September 1, 2038, with interest rates ranging from 4.74% to 6.20%. Principal and interest payments for the Bonds will be charged through the assessment of special property taxes.

XML

Commitments and Contingencies (Details 1) (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies (Textuals) [Abstract]
Commitments for contracts and executed leases, operating and redevelopment and development properties	$ 601.8		$ 601.8
Construction bonds, outstanding	4.4		4.4
Ten Year Ground Lease Extension Option			10 years
Forty-Five Year Ground Lease Extension Option			45 years
Period after which Ground lease rentals are adjusted based on fair market value and the Consumer Price Index			5 years
Annual ground lease rental obligations limit			1.0
Ground Lease, Minimum Rent Increase, Period of Increase			5 years
Ground Lease, Minimum Rent Increase, Percentage of Annual Percentage Rent			50.00%
Proceeds from Bankruptcy Claim	0.9	3.7
Proceeds from Legal Settlements				1.0	3.6
Bad Debt Expense, Recoveries of Bad Debt					1.0
Ten Year Ground Lease Extension Option [Member]
Commitments and Contingencies (Textuals) [Abstract]
Number of extension options			3
Forty-Five Year Ground Lease Extension Option [Member]
Commitments and Contingencies (Textuals) [Abstract]
Number of extension options			1
Other Income [Member]
Commitments and Contingencies (Textuals) [Abstract]
Gain (Loss) Related to Litigation Settlement				$ 4.3

XML

Quarterly Financial Information of the Operating Partnership (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information of the Operating Partnership

Quarterly Financial Information of the Company (Unaudited)

Summarized quarterly financial data for the years ended December 31, 2012 and 2011 was as follows:

	2012 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	92,397		$	97,111		$	104,293		$	111,111
Net Operating Income from continuing operations (2)(3)	67,791			68,437			72,251			79,276
Income (loss) from continuing operations (3)	2,165			36			(665		)	3,911
Income from discontinued operations (3)	76,506			2,241			3,187			189,720
Net income	78,671			2,277			2,522			193,631
Net income attributable to Kilroy Realty Corporation	76,876			2,297			2,589			189,152
Preferred dividends and distributions	(9,336		)	(3,097		)	(5,342		)	(3,313		)
Net income (loss) available to common stockholders	67,540			(800		)	(2,753		)	185,839
Net income (loss) available to common stockholders per share—basic	1.06			(0.02		)	(0.04		)	2.49
Net income (loss) available to common stockholders per share—diluted	1.06			(0.02		)	(0.04		)	2.45
	2011 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	76,003		$	81,002		$	86,398		$	94,226
Net Operating Income from continuing operations (2)(3)	53,660			56,910			60,268			67,777
Income from continuing operations (3)	750			(1,071		)	(3,391		)	(16		)
Income from discontinued operations (3)	4,117			4,543			17,681			44,876
Net income	4,867			3,472			14,290			44,860
Net income attributable to Kilroy Realty Corporation	4,833			3,482			13,994			43,706
Preferred dividends and distributions	(3,799		)	(3,799		)	(3,799		)	(3,799		)
Net income (loss) available to common stockholders	1,034			(317		)	10,195			39,907
Net income (loss) available to common stockholders per share—basic	0.01			(0.01		)	0.17			0.68
Net income (loss) available to common stockholders per share—diluted	0.01			(0.01		)	0.17			0.68

____________________

(1) The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding.  The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

(2) Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

(3) All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

Kilroy Realty, L.P. [Member]

Quarterly Financial Information of the Operating Partnership

Quarterly Financial Information of the Operating Partnership (Unaudited)

Summarized quarterly financial data for the years ended December 31, 2012 and 2011 was as follows:

	2012 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per unit amounts)
Revenues from continuing operations (3)	$	92,397		$	97,111		$	104,293		$	111,111
Net Operating Income from continuing operations (2)(3)	67,791			68,437			72,251			79,276
Income (loss) from continuing operations (3)	2,165			36			(665		)	3,911
Income from discontinued operations (3)	76,506			2,241			3,187			189,720
Net income	78,671			2,277			2,522			193,631
Net income attributable to the Operating Partnership	78,618			2,234			2,474			193,137
Preferred distributions	(9,336		)	(3,097		)	(5,342		)	(3,313		)
Net income (loss) available to common unitholders	69,282			(863		)	(2,868		)	189,824
Net income (loss) available to common unitholders per unit—basic	1.05			(0.02		)	(0.04		)	2.48
Net income (loss) available to common unitholders per unit—diluted	1.05			(0.02		)	(0.04		)	2.44
	2011 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per unit amounts)
Revenues from continuing operations (3)	$	76,003		$	81,002		$	86,398		$	94,226
Net Operating Income from continuing operations (2)(3)	53,660			56,910			60,268			67,777
Income from continuing operations (3)	750			(1,071		)	(3,391		)	(16		)
Income from discontinued operations (3)	4,117			4,543			17,681			44,876
Net income	4,867			3,472			14,290			44,860
Net income attributable to the Operating Partnership	4,833			3,440			14,260			44,427
Preferred distributions	(3,799		)	(3,799		)	(3,799		)	(3,799		)
Net income (loss) available to common unitholders	1,034			(359		)	10,461			40,628
Net income (loss) available to common unitholders per unit—basic	0.01			(0.01		)	0.17			0.68
Net income (loss) available to common unitholders per unit—diluted	0.01			(0.01		)	0.17			0.68

___________________

(1) The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding.  The summation of the quarterly net income (loss) available to common unitholders per unit does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

(2) Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

(3) All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

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Preferred and Common Units of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2012

Class of Stock [Line Items]

Schedule of Dividends Payable [Table Text Block]

The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock, preferred stock, and noncontrolling units as of December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Dividends and Distributions payable to:
Common stockholders	$	26,224	$	20,587
Noncontrolling common unitholders of the Operating Partnership	639		601
RSU holders (1)	367		295
Total accrued dividends and distribution to common stockholders and noncontrolling unitholders	27,230		21,483
Preferred stockholders	1,694		1,209
Total accrued dividends and distributions	$	28,924	$	22,692

______________________

(1) The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12)

Schedule of Stock by Class [Table Text Block]

	December 31,
	2012	2011
Outstanding Shares and Units:
Common stock (1)	74,926,981	58,819,717
Noncontrolling common units	1,826,503	1,718,131
RSUs (2)	1,048,863	842,675
Series E Preferred stock		1,610,000
Series F Preferred stock		3,450,000
Series G Preferred stock	4,000,000
Series H Preferred stock	4,000,000

______________________

(1) The amount includes nonvested shares.

(2) The amount includes nonvested RSUs.

Kilroy Realty, L.P. [Member]

Class of Stock [Line Items]

Schedule of Dividends Payable [Table Text Block]

The following tables summarize accrued distributions for the noted common and preferred units as of December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Distributions payable to:
General partner	$	26,224	$	20,587
Common limited partners	639		601
RSU holders (1)	367		295
Total accrued distributions to common unitholders	27,230		21,483
Preferred unitholders	1,694		1,209
Total accrued distributions	$	28,924	$	22,692

______________________

(1) The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12).

Schedule of Stock by Class [Table Text Block]

	December 31,
	2012	2011
Outstanding Units:
Common units held by the general partner	74,926,981	58,819,717
Common units held by the limited partners	1,826,503	1,718,131
RSUs	1,048,863	842,675
Series E Preferred units		1,610,000
Series F Preferred units		3,450,000
Series G Preferred units	4,000,000
Series H Preferred units	4,000,000

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Organization and Ownership (Details Textuals)	12 Months Ended
	Dec. 31, 2012 building	Dec. 31, 2011
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Stabilized occupancy	95.00%
Number of properties of the company in Washington	10
Percentage of general partnership interest owned by the company in the Operating Partnership	97.60%	97.20%
Percentage of Common limited partnership interest owned by certain non-affiliated investors and certain directors and officers of the Company in the Operating Partnership	2.40%	2.80%
Percentage of General partnership interest owned by wholly-owned subsidiary of the Company	1.00%
Percentage of limited partnership interest owned by Operating Partnership	99.00%

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Pro Forma Results of the Company (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	10 Months Ended	12 Months Ended											7 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Pro Forma Information Including 2011 Acquisitions [Member]		Dec. 31, 2011 Pro Forma Information Including 2011 Acquisitions [Member]		Dec. 31, 2011 Pro Forma Information Including 2011 and 2010 Acquisitions [Member]		Dec. 31, 2010 Pro Forma Information Including 2011 and 2010 Acquisitions [Member]		Dec. 31, 2011 Pro Forma 2011 Material Acquisitions [Member]		Dec. 31, 2011 Pro Forma 2011 Material Acquisitions [Member]	Dec. 31, 2012 Pro Forma 2012 Material Acquisitions [Member]
Pro forma Results of the Company
Revenues					$ 414,813		$ 363,815		$ 377,871		$ 283,941
Net income available to common stockholders					238,947	[1],[2]	42,601	[1],[2]	41,293	[1],[2],[3]	2,491	[1],[2],[3]
Net income available to common stockholders per share - basic					$ 3.41	[1],[2]	$ 0.73	[1],[2]	$ 0.71	[1],[2],[3]	$ 0.03	[1],[2],[3]
Net income available to common stockholders per share - diluted					$ 3.41	[1],[2]	$ 0.73	[1],[2]	$ 0.71	[1],[2],[3]	$ 0.03	[1],[2],[3]
Actual results for material acquisitions
Revenues	18,943												15,150
Net income	3,412												397	[4]
Pro Forma Results of the Company (Textuals) [Abstract]
Acquisition-related expenses		$ 4,937	$ 4,053	$ 2,248											$ 600	$ 1,000

[1] The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to common stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

[2] The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisition of 4100-4700 Bohannon Drive, Menlo Park, CA , 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

[3] The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

[4] Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

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Tax Treatment of Distributions Tax Treatment of Distributions (Tables)

12 Months Ended

Dec. 31, 2012

Tax Treatment of Distributions [Line Items]

Reconciliation of Dividends Declared to Dividends Paid [Table Text Block]

The following table reconciles the dividends declared per common share to the dividends paid per common share during the years ended December 31, 2012, 2011, and 2010 as follows:

	Year Ended December 31,
Dividends	2012		2011		2010
Dividends declared per common share	1.400		1.400		1.400
Less: Dividends declared in the current year and paid in the following year	(0.350	)	(0.350	)	(0.350	)
Add: Dividends declared in the prior year and paid in the current year	0.350		0.350		0.350
Dividends paid per common share	1.400		1.400		1.400

Common Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [Table Text Block]

The unaudited income tax treatment for the dividends to common stockholders reportable for the years ended December 31, 2012, 2011, and 2010 as identified in the table above was as follows:

	Year Ended December 31,
Common Shares	2012				2011				2010
Ordinary income	$	0.577	41.21	%	$	0.230	16.43	%	$	—	—	%
Return of capital	0.823		58.79		1.170		83.57		1.400		100.00
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	1.400	100.00	%	$	1.400	100.00	%	$	1.400	100.00	%

_________________

(1) Capital gains are comprised entirely of 15% rate gains.

Series E Cumulative Redeemable Preferred Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [Table Text Block]

The unaudited income tax treatment for the dividends to Series E preferred stockholders reportable for the years ended December 31, 2012, 2011, and 2010 is seen in the table below. Series E preferred stock was redeemed on April 16, 2012.

	Year Ended December 31,
Preferred Shares	2012				2011				2010
Ordinary income	$	0.818	100.00	%	$	1.950	100.00	%	$	1.950	100.00	%
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	0.818	100.00	%	$	1.950	100.00	%	$	1.950	100.00	%

__________________

(1) Capital gains are comprised entirely of 15% rate gains.

Series F Cumulative Redeemable Preferred Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [Table Text Block]

The unaudited income tax treatment for the dividends to Series F preferred stockholders reportable for the years ended December 31, 2012, 2011, and 2010 is seen in the table below. Series F preferred stock was redeemed on April 16, 2012.

	Year Ended December 31,
Preferred Shares	2012				2011				2010
Ordinary income	$	0.786	100.00	%	$	1.875	100.00	%	$	1.875	100.00	%
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	0.786	100.00	%	$	1.875	100.00	%	$	1.875	100.00	%

_________________

(1) Capital gains are comprised entirely of 15% rate gains.

Series G Cumulative Redeemable Preferred Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [Table Text Block]

The 6.875% Series G Cumulative Redeemable Preferred Stock was issued in March 2012. The unaudited income tax treatment for the dividends to Series G preferred stockholders reportable for the year ended December 31, 2012 was as follows:

	Year Ended December 31,
Preferred Shares	2012
Ordinary income	$	1.089	100.00	%
Capital gains (1)	—		—
Unrecaptured section 1250 gains	—		—
	$	1.089	100.00	%

__________________

(1) Capital gains are comprised entirely of 15% rate gains.

Series H Cumulative Redeemable Preferred Stock [Member]

Tax Treatment of Distributions [Line Items]

Schedule of the income tax treatment for dividends to stockholders [Table Text Block]

The 6.375% Series H Cumulative Redeemable Preferred Stock was issued in August 2012. The unaudited income tax treatment for the dividends to Series H preferred stockholders reportable for the year ended December 31, 2012 was as follows:

	Year Ended December 31,
Preferred Shares	2012
Ordinary income	$	0.398	100.00	%
Capital gains (1)	—		—
Unrecaptured section 1250 gains	—		—
	$	0.398	100.00	%

__________________

(1) Capital gains are comprised entirely of 15% rate gains.

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Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net (Tables)

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Summary of identified deferred leasing costs and acquisition-related intangible assets

The following table summarizes our deferred leasing costs and acquisition-related intangible assets (acquired value of leasing costs, above-market operating leases, in-place leases and below-market ground lease obligation) and intangible liabilities (acquired value of below-market operating leases and above-market ground lease obligation) as of December 31, 2012 and 2011:

	December 31,
	2012			2011
	(in thousands)
Deferred Leasing Costs and Acquisition-related Intangible Assets, net:
Deferred leasing costs	$	168,087		$	142,652
Accumulated amortization	(61,443		)	(52,974		)
Deferred leasing costs, net	106,644			89,678
Above-market operating leases	27,977			28,143
Accumulated amortization	(12,180		)	(8,101		)
Above-market operating leases, net	15,797			20,042
In-place leases	101,061			61,355
Accumulated amortization	(34,019		)	(15,753		)
In-place leases, net	67,042			45,602
Below-market ground lease obligation	690			200
Accumulated amortization	(205		)	—
Below-market ground lease obligation, net	485			200
Total deferred leasing costs and acquisition-related intangible assets, net	$	189,968		$	155,522
Acquisition-related Intangible Liabilities, net(1):
Below-market operating leases	$	70,486		$	37,582
Accumulated amortization	(17,555		)	(6,158		)
Below-market operating leases, net	52,931			31,424
Above-market ground lease obligation	6,320			5,200
Accumulated amortization	(122		)	(37		)
Above-market ground lease obligation, net	6,198			5,163
Total acquisition-related intangible liabilities, net	$	59,129		$	36,587

________________________

(1) Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets.

Amortization for the period related to deferred leasing costs and acquisition-related intangibles

The following table sets forth amortization related to deferred leasing costs and acquisition-related intangibles for the years ended December 31, 2012, 2011 and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Deferred leasing costs (1)	$	20,804		$	16,905		$	13,344
Above-market operating leases (2)	5,695			5,946			2,163
In-place leases (1)	21,976			12,575			3,266
Below-market ground lease obligation (3)	205			—			—
Below-market operating leases (4)	(12,393		)	(4,890		)	(786		)
Above-market ground lease obligation (5)	(85		)	(37		)	—
Total	$	36,202		$	30,499		$	17,987

_________________________

(1) The amortization of deferred leasing costs and in-place leases is recorded to depreciation and amortization expense in the consolidated statements of operations for the periods

presented.

(2) The amortization of above-market operating leases is recorded as a decrease to rental income in the consolidated statements of operations for the periods presented.

(3) The amortization of the below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented.

(4) The amortization of below−market operating leases is recorded as an increase to rental income in the consolidated statements of operations for the periods presented.

(5) The amortization of the above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented.

Estimated annual amortization related to deferred leasing costs and acquisition-related intangibles

The following table sets forth the estimated annual amortization expense related to deferred leasing costs and acquisition-related intangibles as of December 31, 2012 for future periods:

Year Ending	Deferred Leasing Costs		Above-Market Operating Leases (1)		In-Place Leases		Below-Market Ground Lease Obligation (2)		Below-Market Operating Leases (3)			Above-Market Ground Lease Obligation (4)
	(in thousands)
2013	$	22,676	$	5,316	$	23,298	$	8	$	(13,140	)	$	(101	)
2014	20,235		4,336		15,567		8		(11,360		)	(101		)
2015	16,377		2,533		9,913		8		(8,828		)	(101		)
2016	13,757		1,506		6,798		8		(6,645		)	(101		)
2017	11,421		1,185		5,417		8		(5,577		)	(101		)
Thereafter	22,178		921		6,049		445		(7,381		)	(5,693		)
Total	$	106,644	$	15,797	$	67,042	$	485	$	(52,931	)	$	(6,198	)

_______________________

(1) Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations.

(2) Represents estimated annual amortization related to below−market ground lease obligations. Amounts will be recorded as an increase to ground lease expense in the consolidated statements of operations.

(3) Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations.

(4) Represents estimated annual amortization related to above−market ground lease obligations. Amounts will be recorded as a decrease to ground lease expense in the consolidated statements of operations.

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Consolidated Balance Sheets (KILROY REALTY, L.P.) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
REAL ESTATE ASSETS (Notes 3, 17, and 18):
Land and improvements	$ 612,714	$ 537,574
Buildings and improvements	3,335,026	2,830,310
Undeveloped land and construction in progress	809,654	430,806
Total real estate held for investment	4,757,394	3,798,690
Accumulated depreciation and amortization	(756,515)	(742,503)
Total real estate held for investment, net ($319,770 and $101,352 of VIE, Note 2)	4,000,879	3,056,187
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 17)	0	84,156
CASH AND CASH EQUIVALENTS	16,700	4,777
RESTRICTED CASH (Note 17)	247,544	358
MARKETABLE SECURITIES (Notes 13 and 16)	7,435	5,691
CURRENT RECEIVABLES, NET (Note 5)	9,220	8,395
DEFERRED RENT RECEIVABLES, NET (Note 5)	115,418	101,142
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 3 and 4)	189,968	155,522
DEFERRED FINANCING COSTS, NET (Notes 2 and 7)	18,971	18,368
PREPAID EXPENSES AND OTHER ASSETS, NET	9,949	12,199
Total Assets	4,616,084	3,446,795
LIABILITIES:
Secured debt (Notes 3, 6, 7 and 16)	561,096	351,825
Exchangeable senior notes, net (Notes 6, 7 and 16)	163,944	306,892
Unsecured debt, net (Notes 6, 7 and 16)	1,130,895	980,569
Unsecured line of credit (Notes 6, 7 and 16)	185,000	182,000
Accounts payable, accrued expenses and other liabilities (Note 15)	154,734	81,713
Accrued distributions (Note 10)	28,924	22,692
Deferred revenue and acquisition-related intangible liabilities, net (Notes 3, 4 and 8)	117,904	79,781
Rents received in advance and tenant security deposits	37,654	26,917
Liabilities and deferred revenue of real estate assets held for sale (Note 17)	0	13,286
Total liabilities	2,380,151	2,045,675
COMMITMENTS AND CONTINGENCIES (Note 15)
7.45% SERIES A CUMULATIVE REDEEMABLE PREFERRED UNITS (Note 9)	0	73,638
Partners' Capital:
Cumulative Redeemable Preferred stock	0	0
TOTAL LIABILITIES, NONCONTROLLING INTEREST AND CAPITAL	4,616,084	3,446,795
Kilroy Realty, L.P. [Member]
REAL ESTATE ASSETS (Notes 3, 17, and 18):
Land and improvements	612,714	537,574
Buildings and improvements	3,335,026	2,830,310
Undeveloped land and construction in progress	809,654	430,806
Total real estate held for investment	4,757,394	3,798,690
Accumulated depreciation and amortization	(756,515)	(742,503)
Total real estate held for investment, net ($319,770 and $101,352 of VIE, Note 2)	4,000,879	3,056,187
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 17)	0	84,156
CASH AND CASH EQUIVALENTS	16,700	4,777
RESTRICTED CASH (Note 17)	247,544	358
MARKETABLE SECURITIES (Notes 13 and 16)	7,435	5,691
CURRENT RECEIVABLES, NET (Note 5)	9,220	8,395
DEFERRED RENT RECEIVABLES, NET (Note 5)	115,418	101,142
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 3 and 4)	189,968	155,522
DEFERRED FINANCING COSTS, NET (Notes 2 and 7)	18,971	18,368
PREPAID EXPENSES AND OTHER ASSETS, NET	9,949	12,199
Total Assets	4,616,084	3,446,795
LIABILITIES:
Secured debt (Notes 3, 6, 7 and 16)	561,096	351,825
Exchangeable senior notes, net (Notes 6, 7 and 16)	163,944	306,892
Unsecured debt, net (Notes 6, 7 and 16)	1,130,895	980,569
Unsecured line of credit (Notes 6, 7 and 16)	185,000	182,000
Accounts payable, accrued expenses and other liabilities (Note 15)	154,734	81,713
Accrued distributions (Note 10)	28,924	22,692
Deferred revenue and acquisition-related intangible liabilities, net (Notes 3, 4 and 8)	117,904	79,781
Rents received in advance and tenant security deposits	37,654	26,917
Liabilities and deferred revenue of real estate assets held for sale (Note 17)	0	13,286
Total liabilities	2,380,151	2,045,675
COMMITMENTS AND CONTINGENCIES (Note 15)
7.45% SERIES A CUMULATIVE REDEEMABLE PREFERRED UNITS (Note 9)	0	73,638
Partners' Capital:
Common units, 74,926,981 and 58,819,717 held by the general partner and 1,826,503 and 1,718,131 held by common limited partners issued and outstanding, respectively	2,040,243	1,203,259
Total Partners' Capital	2,232,654	1,324,841
Noncontrolling interests in consolidated subsidiaries	3,279	2,641
Total capital	2,235,933	1,327,482
TOTAL LIABILITIES, NONCONTROLLING INTEREST AND CAPITAL	4,616,084	3,446,795
Kilroy Realty, L.P. [Member] | Series E Cumulative Redeemable Preferred Unit [Member]
Partners' Capital:
Cumulative Redeemable Preferred stock	0	38,425
Kilroy Realty, L.P. [Member] | Series F Cumulative Redeemable Preferred Unit [Member]
Partners' Capital:
Cumulative Redeemable Preferred stock	0	83,157
Kilroy Realty, L.P. [Member] | Series G Cumulative Redeemable Preferred Unit [Member]
Partners' Capital:
Cumulative Redeemable Preferred stock	96,155	0
Kilroy Realty, L.P. [Member] | Series H Cumulative Redeemable Preferred Unit [Member]
Partners' Capital:
Cumulative Redeemable Preferred stock	$ 96,256	$ 0

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Schedule III - Real Estate and Accumulated Depreciation (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Real Estate and Accumulated Depreciation [Line Items]
Accumulated depreciation, beginning of year	$ 742,503	$ 672,429	$ 605,976
Depreciation of real estate	125,906	105,982	86,288
Total additions during period	125,906	105,982	86,288
Write-offs due to sale	(109,797)	(11,152)	(3,549)
Properties held for sale	0	(14,905)	0
Other	(2,097)	(9,851)	(16,286)
Total deductions during period	(111,894)	(35,908)	(19,835)
Accumulated depreciation, end of year	$ 756,515	$ 742,503	$ 672,429

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Quarterly Financial Information of the Company (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Schedule of Quarterly Financial Information [Table Text Block]

Summarized quarterly financial data for the years ended December 31, 2012 and 2011 was as follows:

	2012 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	92,397		$	97,111		$	104,293		$	111,111
Net Operating Income from continuing operations (2)(3)	67,791			68,437			72,251			79,276
Income (loss) from continuing operations (3)	2,165			36			(665		)	3,911
Income from discontinued operations (3)	76,506			2,241			3,187			189,720
Net income	78,671			2,277			2,522			193,631
Net income attributable to Kilroy Realty Corporation	76,876			2,297			2,589			189,152
Preferred dividends and distributions	(9,336		)	(3,097		)	(5,342		)	(3,313		)
Net income (loss) available to common stockholders	67,540			(800		)	(2,753		)	185,839
Net income (loss) available to common stockholders per share—basic	1.06			(0.02		)	(0.04		)	2.49
Net income (loss) available to common stockholders per share—diluted	1.06			(0.02		)	(0.04		)	2.45
	2011 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	76,003		$	81,002		$	86,398		$	94,226
Net Operating Income from continuing operations (2)(3)	53,660			56,910			60,268			67,777
Income from continuing operations (3)	750			(1,071		)	(3,391		)	(16		)
Income from discontinued operations (3)	4,117			4,543			17,681			44,876
Net income	4,867			3,472			14,290			44,860
Net income attributable to Kilroy Realty Corporation	4,833			3,482			13,994			43,706
Preferred dividends and distributions	(3,799		)	(3,799		)	(3,799		)	(3,799		)
Net income (loss) available to common stockholders	1,034			(317		)	10,195			39,907
Net income (loss) available to common stockholders per share—basic	0.01			(0.01		)	0.17			0.68
Net income (loss) available to common stockholders per share—diluted	0.01			(0.01		)	0.17			0.68

____________________

(1) The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding.  The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

(2) Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

(3) All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

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Basis of Presentation and Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2012

Basis of presentation and significant accounting policies [Line Items]

Consolidation, Policy [Policy Text Block]

The consolidated financial statements of the Company include the consolidated financial position and results of operations of the Company, the Operating Partnership, the Finance Partnership, KSLLC, and all of our wholly-owned subsidiaries. The consolidated financial statements of the Operating Partnership include the consolidated financial position and results of operations of the Operating Partnership, the Finance Partnership, KSLLC, and all wholly-owned and controlled subsidiaries of the Operating Partnership. All intercompany balances and transactions have been eliminated in the consolidated financial statements.

Consolidation, Variable Interest Entity, Policy [Policy Text Block]

As of December 31, 2012 the consolidated financial statements of the Company and the Operating Partnership also included two variable interest entities ("VIEs") in which we are deemed to be the primary beneficiary. During the year ended December 31, 2012, one operating property and one development project were acquired in two separate transactions and transferred to two special purpose VIEs to facilitate potential Section 1031 Exchanges. To realize the tax deferral available under the Section 1031 Exchange, the Company must complete the Section 1031 Exchanges, if any, and take title to the to-be-exchanged properties within 180 days of the acquisition dates (see Note 3). The VIEs were terminated subsequent to year-end. The impact of consolidating the VIEs increased the Company's total assets and liabilities by approximately $337.0 million (of which $319.8 million is related to real estate held for investment on our consolidated balance sheets) and $111.1 million, respectively, at December 31, 2012. As of December 31, 2011, the consolidated financial statements of the Company and the Operating Partnership included one VIE in which we were deemed to be the primary beneficiary, which was established in September 2011 to facilitate a Section 1031 Exchange. The impact of consolidating this VIE increased the Company's total assets and liabilities by approximately $108.5 million (of which $101.4 million was related to real estate held for investment on our consolidated balance sheets) and $7.3 million, respectively, at December 31, 2011. This Section 1031 Exchange was completed in January 2012 and this entity was no longer a VIE at December 31, 2012.

Business Combinations Policy [Policy Text Block]

Acquisitions

We record the acquired tangible and intangible assets and assumed liabilities of acquisitions of operating properties and development and redevelopment opportunities that meet the accounting criteria to be accounted for as business combinations at fair value at the acquisition date. The acquired assets and assumed liabilities for an acquisition generally include but are not limited to: land, buildings and improvements, undeveloped land and construction in progress; and identified tangible and intangible assets and liabilities associated with in-place leases, including tenant improvements, leasing costs, value of above-market and below-market operating leases and ground leases, acquired in-place lease values and tenant relationships, if any. Any debt assumed and equity (including common units of the Operating Partnership) issued in connection with a property acquisition is recorded at fair value on the date of acquisition.

The fair value of land is derived from comparable sales of land within the same submarket and/or region. The fair value of buildings and improvements, tenant improvements, and leasing costs are based upon current market replacement costs and other relevant market rate information.

The fair value of the above-market or below-market component of an acquired in-place operating lease is based upon the present value (calculated using a market discount rate) of the difference between (i) the contractual rents to be paid pursuant to the lease over its remaining non-cancellable lease term and (ii) management's estimate of the rents that would be paid using fair market rental rates and rent escalations at the date of acquisition measured over the remaining non-cancellable term of the lease for above-market operating leases and the initial non-cancellable term plus the term of any below-market fixed rate renewal options, if applicable, for below-market operating leases. Our below-market operating leases generally do not include fixed rate or below-market renewal options. The amounts recorded for above-market operating leases are included in deferred leasing costs and acquisition-related intangibles, net on the balance sheet and are amortized on a straight-line basis as a reduction of rental income over the remaining term of the applicable leases. The amounts recorded for below-market operating leases are included in deferred revenue and acquisition-related liabilities, net on the balance sheet and are amortized on a straight-line basis as an increase to rental income over the remaining term of the applicable leases plus the term of any below-market fixed rate renewal options, if applicable.

The fair value of acquired in-place leases is derived based on management's assessment of lost revenue and costs incurred for the period required to lease the "assumed vacant" property to the occupancy level when purchased. The amount recorded for acquired in-place leases is included in deferred leasing costs and acquisition-related intangibles, net on the balance sheet and amortized as an increase to depreciation and amortization expense over the remaining term of the applicable leases.

We record the acquisition of undeveloped land that does not meet the accounting criteria to be accounted for as business combinations and the subsequent acquisition of the fee interest in land underlying our properties at the purchase price paid and capitalize the associated acquisition costs. During the year ended December 31, 2012, we capitalized $0.7 million in acquisition costs associated with the acquisition of undeveloped land.

Fully amortized intangible assets are written off on January 1st of each fiscal year.

Property, Plant and Equipment, Policy [Policy Text Block]

Operating Properties

Operating properties are generally carried at historical cost less accumulated depreciation. Properties held for sale are reported at the lower of the carrying value or the fair value less estimated cost to sell. The cost of operating properties includes the purchase price or development costs of the properties. Costs incurred for the renovation and betterment of the operating properties are capitalized to our investment in that property. Maintenance and repairs are charged to expense as incurred.

When evaluating properties to be held and used for potential impairment, we first evaluate whether there are any indicators of impairment for any of our properties. If any impairment indicators are present for a specific property, we then perform an undiscounted cash flow analysis and compare the net carrying amount of the property to the property's estimated undiscounted future cash flow over the anticipated holding period. If the estimated undiscounted future cash flow is less than the net carrying amount of the property, we then perform an impairment loss calculation to determine if the fair value of the property is less than the net carrying value of the property. Our impairment loss calculation compares the net carrying amount of the property to the property's estimated fair value, which may be based on estimated discounted future cash flow calculations or third-party valuations or appraisals. We would recognize an impairment loss if the asset's net carrying amount exceeds the asset's estimated fair value. If we were to recognize an impairment loss, the estimated fair value of the asset (less costs to sell for assets held for sale) would become its new cost basis. For a depreciable long-lived asset, the new cost basis would be depreciated (amortized) over the remaining useful life of that asset. We did not record any impairment losses for the periods presented.

Cost Capitalization

All costs clearly associated with the development, redevelopment and construction of a property are capitalized as project costs, including internal compensation costs. In addition, the following costs are capitalized as project costs during periods in which activities necessary to prepare development and redevelopment properties for its intended use are in progress: pre-construction costs essential to the development of the property, interest, real estate taxes, insurance.

• For development and redevelopment properties that are pre-leased, we cease capitalization when revenue recognition commences, which is upon substantial completion of tenant improvements.

• For development and redevelopment properties that are not pre-leased, we may not immediately build out the tenant improvements. Therefore we cease capitalization when revenue recognition commences upon substantial completion of the tenant improvements, but in any event not later than one year after the cessation of major construction activities. We also cease capitalization on a development or redevelopment property when activities necessary to prepare the property for its intended use have been suspended.

• For development or redevelopment properties with multiple tenants and staged leasing, we cease capitalization and begin depreciation on the portion of the development or redevelopment property for which revenue recognition has commenced.

Once major construction activity has ceased and the development or redevelopment property is in the lease-up phase, the costs capitalized to construction in progress are transferred to land and improvements, buildings and improvements, and deferred leasing costs on our consolidated balance sheets as the historical cost of the property.

Depreciation and Amortization of Buildings and Improvements

The cost of buildings and improvements and tenant improvements are depreciated using the straight-line method of accounting over the estimated useful lives set forth in the table below. Depreciation expense for buildings and improvements, including discontinued operations, for the three years ended December 31, 2012, 2011, and 2010 was $125.9 million, $106.0 million and $86.3 million, respectively.

Asset Description	Depreciable Lives
Buildings and improvements	25 – 40 years
Tenant improvements	1 – 20 years(1)

________________________

(1) Tenant improvements are amortized over the shorter of the lease term or the estimated useful life. 

Discontinued Operations, Policy [Policy Text Block]

The revenues and expenses of operating properties that have been sold, if material, and the revenues and expenses of operating properties that have been classified as held for sale, if material, are reported in the consolidated statements of operations as discontinued operations for all periods presented through the date of the applicable disposition. The net gains (losses) on disposition of operating properties are reported in the consolidated statements of operations as discontinued operations in the period the properties are sold. In determining whether the revenues, expenses, and net gains (losses) on dispositions of operating properties are reported as discontinued operations, we evaluate whether we have any significant continuing involvement in the operations, leasing, or management of the sold property. If we were to determine that we had any significant continuing involvement, the revenues, expenses and net gain (loss) on dispositions of the operating property would not be recorded in discontinued operations.

An operating property is classified as held for sale when certain criteria are met, including but not limited to the availability of the asset for immediate sale, the existence of an active program to locate a buyer, and the probable sale or transfer of the asset within one year. If such criteria are met, we present the applicable assets and liabilities related to the property held for sale, if material, separately on the balance sheet and we would cease to record depreciation and amortization expense. Properties held for sale are reported at the lower of their carrying value or their estimated fair value less the estimated costs to sell. As of December 31, 2012, we did not have any buildings classified as held for sale, and as of December 31, 2011, we had two buildings classified as held for sale, which were sold in January 2012 (see Note 17).

Revenue Recognition Leases, Operating [Policy Text Block]

Revenue Recognition

We recognize revenue from rent, tenant reimbursements, parking, and other revenue once all of the following criteria are met:

• the agreement has been fully executed and delivered;

• services have been rendered;

• the amount is fixed or determinable; and

• the collectability of the amount is reasonably assured.

Minimum annual rental revenues are recognized in rental revenues on a straight-line basis over the term of the related lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

When management concludes that we are the owner of tenant improvements for accounting purposes, management records the cost to construct the tenant improvements as a capital asset. In addition, management records the cost of certain tenant improvements paid for or reimbursed by tenants as capital assets when management concludes that we are the owner of such tenant improvements. For these tenant improvements, management records the amount funded or reimbursed by tenants as deferred revenue, which is amortized on a straight-line basis as additional rental income over the term of the related lease.

When management concludes that the tenant is the owner of tenant improvements for accounting purposes, management records our contribution towards those improvements as a lease incentive, which is included in deferred leasing costs and acquisition-related intangibles, net on our consolidated balance sheets and amortized as a reduction to rental income on a straight-line basis over the term of the lease.

Tenant Reimbursements

Reimbursements from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs, are recognized as revenue in the period the recoverable costs are incurred. Tenant reimbursements are recognized and recorded on a gross basis, as we are generally the primary obligor with respect to purchasing goods and services from third-party suppliers, have discretion in selecting the supplier, and have credit risk.

Other Property Income

Other property income primarily includes amounts recorded in connection with lease terminations and tenant bankruptcy settlement payments. Lease termination fees are amortized over the remaining lease term, if applicable. If there is no remaining lease term, they are recognized when received and realized. Other property income also includes miscellaneous income from tenants, such as fees related to the restoration of leased premises to their original condition and fees for late rental payments.

Receivables, Policy [Policy Text Block]

Allowances for Uncollectible Tenant and Deferred Rent Receivables

We carry our current and deferred rent receivables net of allowances for uncollectible amounts. Our determination of the adequacy of these allowances is based primarily upon evaluations of individual receivables, current economic conditions, historical loss experience, and other relevant factors. The allowances are increased or decreased through the provision for bad debts on our consolidated statements of operations.

Cash and Cash Equivalents, Unrestricted Cash and Cash Equivalents, Policy [Policy Text Block]

We consider all highly-liquid investments with original maturities of three months or less to be cash equivalents

Cash and Cash Equivalents, Restricted Cash and Cash Equivalents, Policy [Policy Text Block]

Restricted cash consists of cash proceeds from dispositions that are temporarily held at qualified intermediaries for purposes of facilitating potential Section 1031 Exchanges and cash held in escrow related to acquisition holdbacks. Restricted cash also includes cash held as collateral to provide credit enhancement for the Operating Partnership's mortgage debt, including cash reserves for capital expenditures, tenant improvements, and property taxes.

Marketable Securities, Trading Securities, Policy [Policy Text Block]

Marketable securities reported in our consolidated balance sheets represent the assets held in connection with the Kilroy Realty Corporation 2007 Deferred Compensation Plan (the "Deferred Compensation Plan") (see Note 13). The Deferred Compensation Plan assets are held in a limited rabbi trust and invested in various mutual and money market funds. As a result, the marketable securities are treated as trading securities for financial reporting purposes and are adjusted to fair value at the end of each accounting period, with the corresponding gains and losses recorded in interest income and other net investment gains.

Compensation Related Costs, Policy [Policy Text Block]

At the time eligible management employees ("Participants") defer compensation or earn mandatory Company contributions, or if we were to make a discretionary contribution, we record compensation cost and a corresponding deferred compensation plan liability, which is included in accounts payable, accrued expenses, and other liabilities on our consolidated balance sheets. This liability is adjusted to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each Participant, and the impact of adjusting the liability to fair value is recorded as an increase or decrease to compensation cost. The impact of adjusting the deferred compensation plan liability to fair value and the changes in the value of the marketable securities held in connection with the Deferred Compensation Plan generally offset and therefore does not significantly impact net income.

Deferred Charges, Policy [Policy Text Block]

Costs incurred in connection with successful property leasing are capitalized as deferred leasing costs and classified as investment activities in the statement of cash flows. Deferred leasing costs consist primarily of leasing commissions and also include certain internal payroll costs and lease incentives, which are amortized using the straight-line method of accounting over the lives of the leases which generally range from one to 20 years. We reevaluate the remaining useful lives of leasing costs as the creditworthiness of our tenants and economic and market conditions change. If we determine that the estimated remaining life of a lease has changed, we adjust the amortization period accordingly. Fully amortized deferred leasing costs are written off on January 1st of each fiscal year.

Debt, Policy [Policy Text Block]

Deferred Financing Costs

Financing costs related to the origination or assumption of long-term debt are deferred and generally amortized using the straight-line method of accounting, which approximates the effective interest method, over the contractual terms of the applicable financings. As of December 31, 2012 and 2011, deferred financing costs were reported net of accumulated amortization of $16.6 million and $16.8 million, respectively.

Debt Discounts and Premiums

Original issuance debt discounts and discounts/premiums related to recording debt acquired in connection with operating property acquisitions at fair value are generally amortized and accreted on a straight-line basis, which approximates the effective interest method. Discounts are recorded as additional interest expense from date of issuance or acquisition through the contractual maturity date of the related debt. Premiums are recorded as a reduction to interest expense from the date of issuance or acquisition through the contractual maturity date of the related debt. Our secured debt is presented including unamortized premiums of $7.2 million and $0.8 million as of December 31, 2012 and 2011, respectively. Our unsecured senior notes are presented net of unamortized discounts of $2.1 million and $2.4 million, as of December 31, 2012 and 2011, respectively.

Exchangeable Debt Instruments

The initial proceeds from exchangeable debt that may be settled in cash, including partial cash settlements, are bifurcated between a liability component and an equity component associated with the embedded conversion option. The liability and equity components of exchangeable debt are separately accounted for in a manner such that the interest expense on the exchangeable debt is not recorded at the stated rate of interest but rather at an effective rate that reflects the issuer’s conventional debt borrowing rate at the date of issuance.

We calculate the liability component of exchangeable debt based on the present value of the contractual cash flows discounted at a comparable market conventional debt borrowing rate at the date of issuance. The difference between the principal amount and the fair value of the liability component is reported as a discount on the exchangeable debt that is accreted as additional interest expense from the issuance date through the contractual maturity date using the effective interest method. A portion of this additional interest expense is capitalized to the development and redevelopment balances qualifying for interest capitalization each period. The liability component of the exchangeable debt is reported net of discounts on our consolidated balance sheets.

We calculate the equity component of exchangeable debt based on the difference between the initial proceeds received from the issuance of the exchangeable debt and the fair value of the liability component at the issuance date. The equity component is included in additional paid-in-capital, net of issuance costs, on our consolidated balance sheets. We allocate issuance costs for exchangeable debt between the liability and the equity components based on their relative values.

Gains and Losses on Early Extinguishment of Debt

Gains and losses on early extinguishment of debt represents the gains and losses recorded in connection with the repurchases of portions of our 3.25% Exchangeable Notes, which were outstanding during the year ended December 31, 2011 and repaid during the year ended December 31, 2012 (see Note 7). We calculate the gain or loss on early extinguishment of debt as the difference on the repurchase date between the estimated fair value of the liability component and the net carrying amount of the repurchased exchangeable debt. Deferred financing costs are written off against the gain on early extinguishment of debt or added to the loss on early extinguishment of debt in proportion to the exchangeable debt repurchased.

Noncontrolling Interest [Policy Text Block]

Noncontrolling interests in the Company's consolidated financial statements represent the issued 1,510,000 7.45% Series A Cumulative Redeemable Preferred Units of the Operating Partnership (“Series A Preferred Units”) which were outstanding at December 31, 2011 and common limited partnership interests in the Operating Partnership not held by the Company (“noncontrolling common units”).

The Series A Preferred Units were presented in the temporary equity section of the Company's consolidated balance sheets after total liabilities and before equity and reported at redemption value, less issuance costs, given that the Series A Preferred Units contained a right of redemption at the option of the holders in the event of certain corporate events. On August 15, 2012, the Operating Partnership redeemed all Series A Preferred Units (see Note 9).

Noncontrolling common units are presented in the equity section of the Company's consolidated balance sheets and reported at their proportionate share of the net assets of the Operating Partnership. Noncontrolling interests with redemption provisions that permit the issuer to settle in either cash or shares of common stock at the option of the issuer must be further evaluated to determine whether equity or temporary equity classification on the balance sheet is appropriate. Since the common units contain such a provision, we evaluated the accounting guidance and determined that the common units qualify for equity presentation in the Company's consolidated financial statements (see Note 9).

Net income attributable to noncontrolling common units is allocated based on their relative ownership percentage of the Operating Partnership during the reported period. The noncontrolling interest ownership percentage is determined by dividing the number of noncontrolling common units by the total number of common units outstanding. The issuance or redemption of additional shares of common stock or common units results in changes to the noncontrolling interest percentage as well as the total net assets of the Company. As a result, all equity transactions result in an allocation between equity and the noncontrolling interest in the Company’s consolidated balance sheets and statements of equity to account for the changes in the noncontrolling interest ownership percentage as well as the change in total net assets of the Company.

Partnership Interests [Policy Text Block]

Preferred partnership interests of the Operating Partnership represent the issued and outstanding 4,000,000 6.875% Series G Cumulative Redeemable Preferred Units ("Series G Preferred Units") and the 4,000,000 6.375% Series H Cumulative Redeemable Preferred Units ("Series H Preferred Units"), which were outstanding as of December 31, 2012. The Series A Preferred Units, 1,610,000 7.80% Series E Cumulative Redeemable Preferred Units ("Series E Preferred Units") and 3,450,000 7.50% Series F Cumulative Redeemable Preferred Units ("Series F Preferred Units") were outstanding as of December 31, 2011 and redeemed during the year ended December 31, 2012.

The Series A Preferred Units were presented in the temporary equity section of the Operating Partnership's consolidated balance sheets after total liabilities and before equity and reported at redemption value, less issuance costs, given that the Series A Preferred Units contain a right of redemption at the option of the holders in the event of certain corporate events (see Note 9).

The Series G and Series H Preferred Units are presented in the permanent equity section of the Operating Partnership's consolidated balance sheets given that the Series G and Series H Preferred Units may be redeemed only at our option (see Note 11). The Company is the holder of both the Series G and Series H Preferred Units and for each Series G and Series H Preferred Unit, the Company has an equivalent number of shares of the Company's 6.875% Series G Cumulative Redeemable Preferred Stock and shares of the Company's 6.375% Series H Cumulative Redeemable Preferred Stock publicly issued and outstanding. The Series E Preferred Units and Series F Preferred Units were presented in the permanent equity section of the Operating Partnership's consolidated balance sheets at December 31, 2011, similar to the Series G and Series H Preferred Units.

Stockholders' Equity, Policy [Policy Text Block]

Underwriting commissions and offering costs incurred in connection with common equity offerings and our at-the-market stock offering program (see Note 10) are reflected as a reduction of additional paid-in capital. Issuance costs incurred in connection with preferred equity offerings are reflected as a reduction of the carrying value of the preferred equity.

The Company records preferred stock issuance costs as a non-cash preferred equity distribution at the time we notify the holders of preferred stock or units of our intent to redeem such shares or units.

The net proceeds from any equity offering of the Company are contributed to the Operating Partnership in exchange for a number of common or preferred units equivalent to the number of shares of common or preferred stock issued and are reflected in the Operating Partnership's consolidated financial statements as an increase in partners' capital.

Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block]

Compensation cost for all share-based awards, including options, requires measurement at estimated fair value on the grant date and recognition of the compensation cost is recognized over the service vesting period, which represents the requisite service period, on a straight-line basis. The grant date fair value of market measure-based share-based compensation plans are calculated using a Monte Carlo simulation pricing model. The grant date fair value of stock option grants is calculated using the Black-Scholes valuation model.

For share-based awards in which the performance period precedes the grant date, we recognize compensation cost over the requisite service period, which includes both the performance and service vesting periods, using the accelerated attribution expense method. The requisite service period begins on the date the Executive Compensation Committee authorizes the award and adopts any relevant performance measures.

During the performance period for a share-based award program when the performance period precedes the grant date, we estimate the total compensation cost of the potential future awards. We then record compensation cost equal to the portion of the requisite service period that has elapsed through the end of the reporting period. For programs with performance-based measures, the total estimated compensation cost is based on our most recent estimate of the probable achievement of the pre-established specific corporate performance measures. These estimates are based on our latest internal forecasts for each performance measure. For programs with market measures, the total estimated compensation cost is based on the fair value of the award at the reporting date.

In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of Company common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period.

For share based awards granted by the Company, the Operating Partnership issues a number of common units equal to the number of shares of common stock ultimately granted by the Company in respect of such awards.

Earnings Per Share, Policy [Policy Text Block]

Basic net income (loss) available to common stockholders per share is computed by dividing net income (loss) available to common stockholders, after the allocation of income to participating securities, by the weighted-average number of vested shares of common stock outstanding, for the period. Diluted net income (loss) available to common stockholders per share is computed by dividing net income (loss) available for common stockholders, after the allocation of income to participating securities, by the sum of the weighted-average number of shares of common stock outstanding for the period plus the assumed exercise of all dilutive securities. The impact of the outstanding common units is considered in the calculation of diluted net income (loss) available to common stockholders per share. The common units are not reflected in the diluted net income (loss) available to common stockholders per share calculation because the exchange of common units into common stock is on a one for one basis, and the common units are allocated net income on a per share basis equal to the common stock (see Note 19). Accordingly, any exchange would not have any effect on diluted net income (loss) available to common stockholders per share.

Nonvested share-based payment awards (including nonvested restricted stock units ("RSUs") and dividend equivalents issued to holders of RSUs) containing nonforfeitable rights to dividends or dividend equivalents are accounted for as participating securities and included in the computation of basic and diluted net income (loss) available to common stockholders per share pursuant to the two-class method. The dilutive effect of stock options are reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. The dilutive effect of Exchangeable Notes are reflected in the weighted average diluted outstanding shares calculation when the average quoted trading price of the Company's common stock on the NYSE for the periods presented was above the Exchangeable Notes exchange prices. The dilutive effect of the outstanding nonvested shares of common stock (“nonvested shares”) and RSUs that have not yet been granted but are contingently issuable under the share-based compensation programs is reflected in the weighted average diluted shares calculation by application of the treasury stock method at the beginning of the quarterly period in which all necessary conditions have been satisfied.

Fair Value of Financial Instruments, Policy [Policy Text Block]

The fair value of our financial assets and liabilities are disclosed in Note 16 to our consolidated financial statements. The only financial assets recorded at fair value on a recurring basis in our consolidated financial statements are our marketable securities. We elected not to apply the fair value option for any of our eligible financial instruments or other items.

We determine the estimated fair value of financial assets and liabilities utilizing a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions. This hierarchy requires the use of observable market data when available. The following is the fair value hierarchy:

• Level 1—quoted prices for identical instruments in active markets;

• Level 2—quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and

• Level 3—fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.

We determine the fair value for the marketable securities using quoted prices in active markets for identical assets. Our other financial instruments, which are only disclosed at fair value, are comprised of secured debt, unsecured senior notes, unsecured line of credit, unsecured term loan facility and Exchangeable Notes.

We generally determine the fair value of our secured debt, unsecured line of credit, and unsecured term loan facility by performing discounted cash flow analyses using an appropriate market discount rate. We calculate the market rate by obtaining period-end treasury rates for maturities that correspond to the maturities of our fixed-rate debt and then adding an appropriate credit spread based on information obtained from third-party financial institutions. We calculate the market rate of our unsecured line of credit and unsecured term loan facility by obtaining the period-end London Interbank Offered Rate ("LIBOR") rate and then adding an appropriate credit spread based on information obtained from third-party financial institutions. These credit spreads take into account factors, including but not limited to, our credit profile, the tenure of the debt, amortization period, whether the debt is secured or unsecured, and the loan-to-value ratio of the debt to the collateral. These calculations are significantly affected by the assumptions used, including the discount rate, credit spreads, and estimates of future cash flow. We determine the fair value of the liability component of our Exchangeable Notes by performing discounted cash flow analyses using an appropriate market interest rate based upon spreads for our publicly traded debt. We determine the fair value of each of our publicly traded unsecured senior notes based on their quoted trading price at the end of the reporting period, if such prices are available.

Carrying amounts of our cash and cash equivalents, restricted cash, and accounts payable approximate fair value due to their short-term maturities.

Segment Reporting, Policy [Policy Text Block]

At December 31, 2012 we only had one segment, which was our office properties segment, because all of our industrial properties were sold during the year ended December 31, 2012. During the year ended December 31, 2011 we had one reportable segment, which was our office properties segment, and we had one non-reportable segment, which was our industrial properties segment.

For the year ended December 31, 2011, the amount of revenues and Net Operating Income generated by our industrial properties, in relation to our total consolidated operating portfolio revenues and Net Operating Income, fell below the required 10% quantitative reporting threshold and the industrial properties were no longer considered to be a reportable segment under GAAP.  For the year ended December 31, 2010, the amount of revenues and Net Operating Income generated by our industrial properties, in relation to our total consolidated operating portfolio revenues and Net Operating Income, was greater than the required 10% quantitative reporting threshold and the industrial properties were considered to be a reportable segment under GAAP.

Income Tax, Policy [Policy Text Block]

We have elected to be taxed as a REIT under Sections 856 through 860 of the Code. To qualify as a REIT, we must distribute annually at least 90% of our adjusted taxable income, as defined in the Code, to our stockholders and satisfy certain other organizational and operating requirements. For distributions with respect to taxable years ended on or before December 31, 2011, IRS guidance allows REITs to satisfy up to 90% of this requirement through the distribution of shares of common stock, if certain conditions are met. We generally will not be subject to federal income taxes if we distribute 100% of our taxable income for each year to our stockholders. If we fail to qualify as a REIT in any taxable year, we will be subject to federal income taxes (including any applicable alternative minimum tax) on our taxable income at regular corporate rates and we may not be able to qualify as a REIT for four subsequent taxable years. Even if we qualify for taxation as a REIT, we may be subject to certain state and local taxes on our income and property and to federal income taxes and excise taxes on our undistributed taxable income. We believe that we have met all of the REIT distribution and technical requirements for the years ended December 31, 2012, 2011 and 2010, and we were not subject to any federal income taxes (see Note 21). We intend to continue to adhere to these requirements and maintain the Company’s REIT status.

In addition, any taxable income from our taxable REIT subsidiary, which was formed in August 2002, is subject to federal, state, and local income taxes.

Income Tax Uncertainties, Policy [Policy Text Block]

We include favorable tax positions in the calculation of tax liabilities if it is more likely than not that our adopted tax position will prevail if challenged by tax authorities.

As a result of our REIT status, we are able to claim a dividends-paid deduction on our tax return to deduct the full amount of common and preferred dividends paid to stockholders when computing our annual taxable income. Since this dividends-paid deduction has historically exceeded our taxable income, the Company has historically had significant return of capital to its stockholders. In order for us to be required to record any unrecognized tax benefits or additional tax liabilities, any adjustment for potential uncertain tax positions would need to exceed the return of capital.

We evaluated the potential impact of identified uncertain tax positions for all tax years still subject to potential audit under state and federal income tax law and concluded that our return of capital would not be materially affected for any of the years still subject to potential audit. As of December 31, 2012, the years still subject to audit are 2008 through 2011 under the California state income tax law and 2009 through 2011 under the federal income tax law. We concluded that we did not have any unrecognized tax benefits or any additional tax liabilities as of December 31, 2012 and 2011.

Use of Estimates, Policy [Policy Text Block]

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reported periods. Actual results could differ from those estimates.

Concentration Risk Credit Risk Policy [Policy Text Block]

All of our properties and all of our business is currently conducted in the state of California with the exception of the ownership and operation of ten office properties located in the state of Washington. The ability of the tenants to honor the terms of their leases is dependent upon the economic, regulatory, and social factors affecting the communities in which the tenants operate.

As of December 31, 2012, our 15 largest tenants represented approximately 34.1% of total annualized base rental revenues.

We have deposited cash with financial institutions that is insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 per institution. As of December 31, 2012 and 2011, we had cash accounts in excess of FDIC insured limits.

Kilroy Realty, L.P. [Member]

Basis of presentation and significant accounting policies [Line Items]

Noncontrolling Interest [Policy Text Block]

Noncontrolling interests of the Operating Partnership represent the Company's 1.0% general partnership interest in the Finance Partnership. This noncontrolling interest is presented in the permanent equity section of the Operating Partnership's consolidated balance sheets given that these interests are not convertible or redeemable into any other ownership interest of the Company or the Operating Partnership.

Partnership Interests [Policy Text Block]

The common units held by the Company and the noncontrolling common units held by the common limited partners are both presented in the permanent equity section of the Operating Partnership's consolidated balance sheets in partners' capital. The redemption rights of the noncontrolling common units permit us to settle the redemption obligation in either cash or shares of the Company's common stock at our option (see Note 9).

Earnings Per Share, Policy [Policy Text Block]

Basic net income (loss) available to common unitholders per unit is computed by dividing net income (loss) available to common unitholders, after the allocation of income to participating securities, by the weighted-average number of vested common units outstanding, for the period. Diluted net income (loss) available to common unitholders per unit is computed by dividing net income (loss) available to common unitholders, after the allocation of income to participating securities, by the sum of the weighted-average number of common units outstanding for the period plus the assumed exercise of all dilutive securities.

The dilutive effect of stock options, Exchangeable Notes, outstanding nonvested shares, RSUs, and awards containing nonforfeitable rights to dividend equivalents are reflected in diluted net income (loss) available to common unitholders per unit in the same manner as noted above for net income (loss) available to common stockholders per share.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2012

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

General

As of December 31, 2012, we had commitments of approximately $601.8 million for contracts and executed leases directly related to our operating and redevelopment properties. This amount includes the $27.5 million that we expect to pay in the second quarter of 2013 upon the closing of the purchase of the land underlying the ground lease at 360 Third Street in San Francisco, CA. We exercised an option to acquire the land during the fourth quarter of 2012.

In the normal course of business, we are required to post construction bonds to guarantee our performance of government-mandated infrastructure improvements. As of December 31, 2012, we had outstanding construction bonds of approximately $4.4 million.

Ground Leases

The following table summarizes our properties that are held subject to long-term noncancellable ground lease obligations and the respective contractual expiration dates:

Property	Contractual Expiration Date(1)
601 108th Ave NE, Bellevue, Washington	November 2093
701, 801 and 837 N. 34th Street, Seattle, Washington (2)	December 2041
Kilroy Airport Center Phases I, II, and III, Long Beach, California	July 2084
360 Third Street, San Francisco, California	December 2022

____________________

(1) Reflects the contractual expiration date prior to the impact of any extension or purchase options held by the Company.

(2) The Company has three10-year and one45-year extension option for this ground lease which if exercised would extend the expiration date to December 2116.

The minimum commitment under our ground leases as of December 31, 2012 for five years and thereafter was as follows:

Year Ending	(in thousands)
2013	$	3,685
2014	3,095
2015	3,095
2016	3,095
2017	3,095
Thereafter	160,007
Total(1)(2)(3)(4)(5)	$	176,072

________________________

(1) Reflects the minimum ground lease obligations before the impact of ground lease extension options.

(2) One of our ground lease obligations is subject to a fair market value adjustment every five years; however, the lease includes ground rent subprotection and infrastructure rent credits which currently limit our annual rental obligations to $1.0 million. The contractual obligations for that ground lease included above assumes the lesser of $1.0 million or annual lease rental obligation in effect as of December 31, 2012.

(3) One of our ground lease obligations includes a component which is based on the percentage of gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every five years based on 50% of the average annual percentage rent for the previous five years. Currently, gross income does not exceed the threshold requiring us to pay percentage rent. The contractual obligations for that ground lease included above assumes the annual lease rental obligation in effect as of December 31, 2012.

(4) One of our ground lease obligations is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals limited to maximum increases annually. The contractual obligations included above assumes the annual lease rental obligation in effect as of December 31, 2012.

(5) As previously discussed, the Company exercised the land purchase option included in the 360 3rd Street ground lease and will acquire the land in the second quarter of 2013. The amount presented above includes payments through the second quarter of 2013 and excludes the purchase price of $27.5 million.

Litigation

We and our properties are subject to litigation arising in the ordinary course of business. To our knowledge, neither we nor any of our properties are presently subject to any litigation or threat of litigation which, if determined unfavorably to us, would have a material adverse effect on our cash flow, financial condition, or results of operations.

During the fourth quarter of 2011, we received cash distributions totaling $3.7 million under a bankruptcy claim related to a former tenant that defaulted on their lease in 2009. Due to these and other distributions received earlier in the year, we recognized $4.3 million from this claim as other property income in 2011. In the fourth quarter of 2012, we received the final cash distribution under the bankruptcy claim of $0.9 million, which we recognized as other property income in 2012.

In the third quarter of 2010, we settled outstanding litigation related to certain premises at one of our properties that had been abandoned by its former occupants. In connection with this legal settlement, we received a $3.6 million cash payment in 2010. In addition, in January 2011 we received a $1.0 million cash payment relating to this matter. As a result, during the year ended December 31, 2010, we reversed approximately $1.0 million of our allowance for bad debts which was previously recorded in prior periods for receivables related to the lease at this property.

Insurance

We maintain commercial general liability, auto liability, employers liability, umbrella/excess liability, special form property, difference in conditions including earthquake and flood, environmental, rental loss, and terrorism insurance covering all of our properties. Management believes the policy specifications and insured limits are reasonable given the relative risk of loss, the cost of the coverage, and industry practice. We do not carry insurance for generally uninsurable losses such as loss from governmental action, nuclear hazard, and war and military action. Policies are subject to various terms, conditions, and exclusions and some policies may involve large deductibles or co-payments.

Environmental Matters

We follow the policy of monitoring our properties for the presence of hazardous or toxic substances. While there can be no assurance that a material environmental liability does not exist, we are not currently aware of any environmental liability with respect to the properties that would have a material adverse effect on our financial condition, results of operations, and cash flow. Further, we are not aware of any environmental liability or any unasserted claim or assessment with respect to an environmental liability that we believe would require additional disclosure or the recording of a loss contingency.

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Future Minimum Rent

12 Months Ended

Dec. 31, 2012

Leases [Abstract]

Future Minimum Rent

Future Minimum Rent

We have operating leases with tenants that expire at various dates through 2027 and are either subject to scheduled fixed increases or adjustments in rent based on the Consumer Price Index. Generally, the leases grant tenants renewal options. Leases also provide for additional rents based on certain operating expenses. Future contractual minimum rent under operating leases as of December 31, 2012 for future periods is summarized as follows:

Year Ending	(in thousands)
2013	$	360,592
2014	346,840
2015	306,262
2016	273,241
2017	230,299
Thereafter	641,268
Total	$	2,158,502

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Discontinued Operations Discontinued Operations (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011 property
Long Lived Assets Held-for-sale [Line Items]
Number of Real Estate Properties Held-for-Sale		2
Real estate assets and other assets held for sale, net	$ 0	$ 84,156
Deferred rent receivables, net	115,418	101,142
Deferred leasing costs and acquisition-related intangible assets, net	189,968	155,522
Accounts payable, accrued expenses and other liabilities	154,734	81,713
Deferred revenue and acquisition-related intangible liabilities, net	117,904	79,781
Rents received in advance and tenant security deposits	37,654	26,917
Liabilities and deferred revenue of real estate assets held for sale	0	13,286
Assets Held-for-sale [Member]
Long Lived Assets Held-for-sale [Line Items]
Real estate assets and other assets held for sale, net		84,156
Deferred rent receivables, net		6,749
Deferred leasing costs and acquisition-related intangible assets, net		2,375
Accounts payable, accrued expenses and other liabilities		24
Deferred revenue and acquisition-related intangible liabilities, net		13,223
Rents received in advance and tenant security deposits		39
Liabilities and deferred revenue of real estate assets held for sale		13,286
Land and Land Improvements [Member]
Long Lived Assets Held-for-sale [Line Items]
Real estate assets held for sale		6,490
Building and Building Improvements [Member]
Long Lived Assets Held-for-sale [Line Items]
Real estate assets held for sale		83,447
Real Estate [Member]
Long Lived Assets Held-for-sale [Line Items]
Real estate assets held for sale		89,937
Accumulated depreciation		(14,905)
Real estate assets and other assets held for sale, net		$ 75,032

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Fair Value Measurements and Disclosures (Tables)

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Fair value of the company's marketable securities

The following table sets forth the fair value of our marketable securities as of December 31, 2012 and 2011 :

	Fair Value (Level 1) (1)
	2012		2011
Description	(in thousands)
Marketable securities (2)	$	7,435	$	5,691

_______________

(1) Based on quoted prices in active markets for identical securities.

(2) The marketable securities are held in a limited rabbi trust.

Fair Value Adjustment Of Marketable Securities And Deferred Compensation Plan Liability [Table Text Block]

The following table sets forth the net gain (loss) on marketable securities recorded during the years ended December 31, 2012, 2011, and 2010:

Description	December 31, 2012		December 31, 2011			December 31, 2010
	(in thousands)
Net gain (loss) on marketable securities	$	723	$	(153	)	$	435

Carrying value and fair value of company's remaining financial assets and liabilities

The following table sets forth the carrying value and the fair value of our other financial instruments as of December 31, 2012 and 2011:

	December 31,
	2012				2011
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Liabilities
Secured debt (1)	$	561,096	$	591,993	$	351,825	$	367,402
Exchangeable senior notes, net (1)	163,944		181,223		306,892		320,919
Unsecured debt, net (2)	1,130,895		1,254,047		980,569		1,011,982
Unsecured line of credit (1)	185,000		185,049		182,000		182,299

_______________

(1) Fair value calculated using Level II inputs which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.

(2) Fair value calculated primarily using Level I inputs which are based on quoted prices for identical instruments in active markets. The carrying value and fair value of the Level I instruments was $653.0 million and $573.0 million, respectively, as of December 31, 2012. The carrying value and fair value of the Level I instruments at December 31, 2011, was $897.6 million and $923.1 million, respectively. The carrying value and fair value of the Level II instruments was $601.0 million and $558.0 million, respectively, as of December 31, 2012. The carrying value and fair value of the Level II instruments at December 31, 2011, was $83.0 million and $88.9 million, respectively.

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Organization and Ownership (Tables)

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of stabilized portfolio of operating properties

Our portfolio of operating properties was comprised of the following office properties at December 31, 2012. During the fourth quarter of 2012 we disposed of our industrial portfolio and, as a result, no longer owned any industrial properties at December 31, 2012 (see Note 17 and 18 for further discussion).

	Number of Buildings	Rentable Square Feet (unaudited)	Number of Tenants	Percent Occupied
Office Properties	114	13,249,780	530	92.8	%

Our stabilized portfolio includes all of our properties with the exception of undeveloped land, development and redevelopment properties currently under construction or committed for construction including 9455 Towne Center in San Diego, CA, which was moved from the stabilized portfolio to the development pipeline in the fourth quarter of 2012, "lease-up" properties and properties held-for-sale. We define redevelopment properties as those projects for which we expect to spend significant development and construction costs on existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. We define "lease-up" properties as properties we recently developed or redeveloped that have not yet reached 95% occupancy and are within one year following cessation of major construction activities. As of December 31, 2012, the following properties were excluded from our stabilized portfolio:

	Number of Properties	Estimated Rentable Square Feet (unaudited) (1)
Development properties under construction	4	1,416,000
Redevelopment properties under construction	1	410,000
Lease-up properties	1	98,000

________________________

(1) Estimated rentable square feet upon completion.

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Fair Value Measurements and Disclosures

12 Months Ended

Dec. 31, 2012

Fair Value Disclosures [Abstract]

Fair Value Measurements and Disclosures

Fair Value Measurements and Disclosures

Assets and Liabilities Reported at Fair Value

The only assets we record at fair value on our consolidated financial statements are the marketable securities related to our Deferred Compensation Plan (see Note 13). The following table sets forth the fair value of our marketable securities as of December 31, 2012 and 2011 :

	Fair Value (Level 1) (1)
	2012		2011
Description	(in thousands)
Marketable securities (2)	$	7,435	$	5,691

_______________

(1) Based on quoted prices in active markets for identical securities.

(2) The marketable securities are held in a limited rabbi trust.

We report the change in the fair value of the marketable securities at the end of each accounting period in interest income and other net investment gains in the consolidated statements of operations. We also adjust the related Deferred Compensation Plan liability to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each participant, which results in a corresponding increase or decrease to compensation cost for the period.

The following table sets forth the net gain (loss) on marketable securities recorded during the years ended December 31, 2012, 2011, and 2010:

Description	December 31, 2012		December 31, 2011			December 31, 2010
	(in thousands)
Net gain (loss) on marketable securities	$	723	$	(153	)	$	435

Financial Instruments Disclosed at Fair Value

The following table sets forth the carrying value and the fair value of our other financial instruments as of December 31, 2012 and 2011:

	December 31,
	2012				2011
	Carrying Value		Fair Value		Carrying Value		Fair Value
	(in thousands)
Liabilities
Secured debt (1)	$	561,096	$	591,993	$	351,825	$	367,402
Exchangeable senior notes, net (1)	163,944		181,223		306,892		320,919
Unsecured debt, net (2)	1,130,895		1,254,047		980,569		1,011,982
Unsecured line of credit (1)	185,000		185,049		182,000		182,299

_______________

(1) Fair value calculated using Level II inputs which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.

(2) Fair value calculated primarily using Level I inputs which are based on quoted prices for identical instruments in active markets. The carrying value and fair value of the Level I instruments was $653.0 million and $573.0 million, respectively, as of December 31, 2012. The carrying value and fair value of the Level I instruments at December 31, 2011, was $897.6 million and $923.1 million, respectively. The carrying value and fair value of the Level II instruments was $601.0 million and $558.0 million, respectively, as of December 31, 2012. The carrying value and fair value of the Level II instruments at December 31, 2011, was $83.0 million and $88.9 million, respectively.

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Discontinued Operations

12 Months Ended

Dec. 31, 2012

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

Discontinued Operations

Properties Held For Sale

We did not have any properties held for sale as of December 31, 2012. We had two properties classified as held for sale at December 31, 2011, which were sold in January 2012. The major classes of assets and liabilities of these properties held for sale as of December 31, 2011 were as follows:

Real estate assets and other assets held for sale	(in thousands)
Land and improvements	$	6,490
Buildings and improvements	83,447
Total real estate held for sale	89,937
Accumulated depreciation	(14,905		)
Total real estate held for sale, net	75,032
Deferred rent receivables, net	6,749
Deferred leasing costs and acquisition-related intangible assets, net	2,375
Real estate assets and other assets held for sale, net	$	84,156
Liabilities and deferred revenue of real estate assets held for sale
Accounts payable, accrued expenses and other liabilities	$	24
Deferred revenue and acquisition-related intangible liabilities, net	13,223
Rents received in advance and tenant security deposits	39
Liabilities and deferred revenue of real estate assets held for sale	$	13,286

Dispositions

The following table summarizes properties sold during the years ended December 31, 2012, 2011, and 2010.

Location	Property Type	Month of Disposition	Number of Buildings	Rentable Square Feet	Sales Price (in millions) (1)
2012 Dispositions
15004 Innovation Drive and 10243 Genetic Center Drive, San Diego, CA (2)	Office	January	2	253,676	$	146.1
Industrial Portfolio (3)	Industrial	November/December	39	3,413,354
5151, 5153 & 5155 Camino Ruiz, Camarillo, CA	Office	December	4	265,372
4175 E. La Palma Avenue, Anaheim, CA	Office	December	1	43,263
Subtotal			44	3,721,989	354.2
Total			46	3,975,665	$	500.3
2011 Dispositions
10350 Barnes Canyon and 10120 Pacific Heights Drive, San Diego, CA	Office	September	2	90,558	$	23.9
2031 E. Mariposa Avenue, Los Angeles, CA	Industrial	December	1	192,053	42.2
Total			3	282,611	$	66.1
2010 Dispositions
660 N. Puente Street, Brea, CA	Industrial	October	1	51,567	$	5.0
601 Valencia Avenue, Brea, CA	Office	December	1	60,891	5.4
603 Valencia Avenue, Brea, CA	Office	December	1	45,900	5.4
Total			3	158,358	$	15.8

__________________

(1) Represents gross sales price before the impact of broker commissions and selling costs.

(2) These properties were classified as held-for-sale on the consolidated balance sheets as of December 31, 2011.

(3) The industrial portfolio was sold in two tranches in November and December 2012 to two separate third party buyers.

At December 31, 2012, approximately $228.8 million of net proceeds related to the sale of the buildings during the quarter ended December 31, 2012 were temporarily being held at a qualified intermediary, at our direction, for the purpose of facilitating Section 1031 Exchanges. The $228.8 million cash proceeds are included in restricted cash on the consolidated balance sheets at December 31, 2012. In January 2013, we successfully completed two Section 1031 Exchanges and all cash proceeds were released from the qualified intermediary.

Discontinued Operations

The following table summarizes the income and expense components that comprise discontinued operations for the years ended December 31, 2012, 2011 and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Revenues:
Rental income	$	22,337		$	39,226		$	39,404
Tenant reimbursements	3,902			5,502			6,330
Other property income	323			790			1,252
Total revenues	26,562			45,518			46,986
Expenses:
Property expenses	4,586			6,733			6,898
Real estate taxes	2,779			4,000			4,020
Provision for bad debts	(195		)	(137		)	(1,128		)
Depreciation and amortization	6,983			11,668			12,973
Interest expense (1)	—			3,624			4,859
Total expenses	14,153			25,888			27,622
Income from discontinued operations before net gain on dispositions of discontinued operations	12,409			19,630			19,364
Net gain on dispositions of discontinued operations	259,245			51,587			949
Total income from discontinued operations	$	271,654		$	71,217		$	20,313

__________________

(1) Interest expense relates to a $70.0 million mortgage loan that was secured by 13 of our industrial properties. The mortgage loan was repaid in October 2011 prior to maturity.

The following table summarizes the total income from discontinued operations within the consolidated statements of operations by segment for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Office Properties	$	77,157	$	20,535	$	7,673
Industrial Properties(1)	194,497		50,682		12,640
Total income from discontinued operations	$	271,654	$	71,217	$	20,313

__________________

(1) The industrial properties were no longer a segment at December 31, 2012 because we disposed of all of our industrial properties during the fourth quarter of 2012.

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Consolidated Statements of Cash Flows (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Capitalized interest	$ 17,657	$ 7,615	$ 7,697

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Segment Disclosure

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Segment Disclosure

Segment Disclosure

At December 31, 2012 we only had one segment, which was our office properties segment, since all of our industrial properties were sold during the year ended December 31, 2012 and the results of operations for these properties were included in discontinued operations for the years ended December 31, 2012, 2011 and 2010. During the year ended December 31, 2011 we had one reportable segment, which was our office properties segment, and we had one non-reportable segment, which was our industrial properties segment. The following table, which reconciles total segment assets to total consolidated assets, is presented solely for the purposes of showing the comparative information for our asset composition at December 31, 2012 and December 31, 2011.

	December 31,
	2012		2011
	(in thousands)
Assets:
Reportable Segment - Office Properties
Land, buildings, and improvements, net	$	3,191,225	$	2,480,338
Undeveloped land and construction in progress	809,654		430,806
Total assets(1)	4,315,485		3,248,661
Non-Reportable Segment - Industrial Properties
Land, buildings, and improvements, net	—		145,043
Total assets(1)	—		156,741
Total Segments
Land, buildings, and improvements, net	3,191,225		2,625,381
Undeveloped land and construction in progress	809,654		430,806
Total assets(1)	4,315,485		3,405,402

Reconciliation to Consolidated Assets:
Total assets allocated to segments	4,315,485		3,405,402
Other unallocated assets:
Cash and cash equivalents	16,700		4,777
Restricted cash	247,544		358
Marketable securities	7,435		5,691
Deferred financing costs, net	18,971		18,368
Prepaid expenses and other assets, net	9,949		12,199
Total consolidated assets	$	4,616,084	$	3,446,795

_______________

(1) Includes land, buildings, and improvements, undeveloped land and construction in progress, real estate assets held for sale, current receivables, deferred rent receivables, deferred

leasing costs, and acquisition-related intangible assets, all shown on a net basis.

	December 31,
	2012		2011
	(in thousands)
Acquisitions and Capital Expenditures:(1)
Reportable Segment - Office Properties
Expenditures for real estate acquisitions	$	1,087,489	$	663,483
Expenditures for development and redevelopment properties and undeveloped land	144,477		32,198
Expenditures for operating properties(2)	86,089		66,448
Non-Reportable Segment - Industrial Properties
Expenditures for operating properties(2)	1,131		6,001
Total Segments
Expenditures for real estate acquisitions	1,087,489		663,483
Expenditures for development and redevelopment properties and undeveloped land	144,477		32,198
Expenditures for operating properties(2)	87,220		72,449

_______________

(1) Total consolidated acquisitions and capital expenditures are equal to the same amounts disclosed for total segments. Amounts represent balances on an accrual basis.

(2) Includes expenditures for building improvements, tenant improvements, deferred leasing costs and acquisition-related intangible assets for our operating properties. Excludes acquisition-related intangible liabilities.

XML

Deferred Revenue and Acquisition Related Liabilities, net Deferred Revenue and Acquisition Related Liabilities, net (Textuals) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Deferred Revenue [Abstract]
Noncash amortization of deferred revenue related to tenant-funded tenant improvements	$ 9,136	$ 9,349	$ 9,689

XML

Schedule III - Real Estate and Accumulated Depreciation (Details) (USD $) In Thousands, unless otherwise specified					12 Months Ended																																																																3 Months Ended		12 Months Ended
	Dec. 31, 2012 sqft		Dec. 31, 2012 Office Properties [Member] sqft		Dec. 31, 2012 Office Properties [Member] 23925 Park Sorrento, Calabasas, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 23975 Park Sorrento, Calabasas, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 24025 Park Sorrento, Calabasas, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 26541 Agoura Road, Calabasas, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2240 E. Imperial Highway, El Segundo, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2250 E. Imperial Highway, El Segundo, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2260 E. Imperial Highway, El Segundo, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 909 Sepulveda Boulevard, El Segundo, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 999 Sepulveda Boulevard, El Segundo, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3750 Kilroy Airport Way, Long Beach, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3760 Kilroy Airport Way, Long Beach, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3780 Kilroy Airport Way, Long Beach, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3800 Kilroy Airport Way, Long Beach, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3840 Kilroy Airport Way, Long Beach, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3880 Kilroy Airport Way, Long Beach, California [Member]		Dec. 31, 2012 Office Properties [Member] 3900 Kilroy Airport Way, Long Beach, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] Kilroy Airport Center, Phase IV, Long Beach, California [Member]		Dec. 31, 2012 Office Properties [Member] 12100 W. Olympic Boulevard, Los Angeles, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 12200 W. Olympic Boulevard, Los Angeles, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] Olympic Blvd 12233, Los Angeles, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] 12312 W. Olympic Boulevard, Los Angeles, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 6255 Sunset Boulevard, Los Angeles, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] 1633 26th Street, Santa Monica, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2100 Colorado Avenue, Santa Monica, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3130 Wilshire Boulevard, Santa Monica, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 501 Santa Monica Boulevard, Santa Monica, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2829 Townsgate Road, Thousand Oaks, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 12225 El Camino Real, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 12235 El Camino Real, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 12340 El Camino Real, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 12390 El Camino Real, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 12348 High Bluff Drive, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 12400 High Bluff Drive, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3579 Valley Centre Drive, Del Mar, Calilfornia [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3611 Valley Centre Drive, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3661 Valley Centre Drive, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3721 Valley Centre Drive, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3811 Valley Centre Drive, Del Mar, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 6200 Greenwich Drive, Governor Park, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 6220 Greenwich Drive, Governor Park, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 15051 Avenue of Science, I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 15073 Avenue of Science, I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 15231 Avenue of Science, I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 15253 Avenue of Science, I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 15333 Avenue of Science, I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 15378 Avenue of Science, I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 15435 Innovation Drive, I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 15445 Innovation Drive, I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 13280 Evening Creek Drive, South I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 13290 Evening Creek Drive, South I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 13480 Evening Creek Drive, North I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 13500 Evening Creek Drive, North I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 13520 Evening Creek Drive, North I-15 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 7525 Torrey Santa Fe, 56 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 7535 Torrey Santa Fe, 56 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 7545 Torrey Santa Fe, 56 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 7555 Torrey Santa Fe, 56 Corridor, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2355 Northside Drive, Mission Valley, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2365 Northside Drive, Mission Valley, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2375 Northside Drive, Mission Valley, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2385 Northside Drive, Mission Valley, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2305 Historic Decatur Road, San Diego, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10020 Pacific Mesa Boulevard, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 4910 Directors Place, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 4921 Directors Place, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 4939 Directors Place, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 4955 Directors Place, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 5005 Wateridge Vista Drive, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 5010 Wateridge Vista Drive, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10770 Wateridge Circle, San Diego, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 6055 Lusk Avenue, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 6260 Sequence Drive, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 6290 Sequence Drive, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 6310 Sequence Drive, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 6340 Sequence Drive, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 6350 Sequence Drive, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10390 Pacific Center Court, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10394 Pacific Center Court, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10398 Pacific Center Court, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10421 Pacific Center Court, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10445 Pacific Center Court, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10455 Pacific Center Court, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 5717 Pacific Center Boulevard, Sorrento Mesa, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 4690 Executive Drive, UTC, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 9785 Towne Center Drive, UTC, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 9791 Towne Center Drive, UTC, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 8101 Kaiser Boulevard, Anaheim, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 2211 Michelson Drive, Irvine, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 111 Pacifica, Irvine, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 999 Town and Country, Orange, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] Bohannon Drive 4100, Menlo Park, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] Bohannon Drive 4200, Menlo Park, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] Bohannon Drive 4300, Menlo Park, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] Bohannon Drive 4400, Menlo Park, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] Bohannon Drive 4500, Menlo Park, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] Bohannon Drive 4600, Menlo Park, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] Bohannon Drive 4700, Menlo Park, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] 303 Second Street, San Francisco, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 100 First Street, San Francisco, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 250 Brannan Street, San Francisco, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 201 Third Street, San Francisco, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 301 Brannan Street, San Francisco, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] 370 Third Street, San Francisco, California [Member]		Dec. 31, 2012 Office Properties [Member] 4040 Civic Center Drive, San Rafael, California [Member] sqft		Dec. 31, 2012 Office Properties [Member] N. Mathilda Avenue 599, Sunnyvale, CA [Member] sqft		Dec. 31, 2012 Office Properties [Member] 601 108th Avenue, Bellevue, Washington [Member] sqft		Dec. 31, 2012 Office Properties [Member] NE 4th Street 10900 Bellevue, Washington [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10220 NE Points Drive, Kirkland, Washington [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10230 NE Points Drive, Kirkland, Washington [Member] sqft		Dec. 31, 2012 Office Properties [Member] 10210 NE Points Drive, Kirkland, Washington [Member] sqft		Dec. 31, 2012 Office Properties [Member] 3933 Lake Washington Boulevard NE, Kirkland, Washington [Member] sqft		Dec. 31, 2012 Office Properties [Member] 15050 N.E. 36th Street, Redmond, Washington [Member] sqft		Dec. 31, 2012 Office Properties [Member] Fremont Lake View Seattle WA [Member] sqft		Dec. 31, 2012 Office Properties [Member] N 34th Street 701, Lake Union, Washington [Member] sqft		Dec. 31, 2012 Office Properties [Member] N 34th Street 801, Lake Union, Washington [Member] sqft		Dec. 31, 2012 Office Properties [Member] 17150 Von Karman, Irvine, California [Member] sqft		Dec. 31, 2012 Undeveloped Land and CIP Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]
Real Estate and Accumulated Depreciation, Amount of Encumbrances	$ 553,919		$ 551,402		$ 11,210	[1]													$ 68,615	[2]																							$ 40,523				$ 53,554				$ 97,000																					[3]								[4]																																																																																																																							$ 135,000	[5]																	$ 83,116	[6]	$ 28,384	[6]											$ 34,000	[6]					$ 2,517
Real Estate and Accumulated Depreciation, Initial Cost of Land	1,109,020		587,387		50		765		845		1,979		1,044		2,579		2,518		3,577		1,407																		352		4,329		22,100		3,325		18,111		2,080		5,474		8,921		4,547		5,248		1,700		1,507		4,201		3,453		1,629		15,167		2,167		4,184		4,038		4,297		3,452		1,583		3,213		2,888		2,070		2,233		1,548		2,371		3,565		2,143		2,143		3,701		5,229		7,997		7,581		7,581		2,348		2,950		2,950		2,287		4,066		7,359		3,947		2,752		5,240		8,007		2,240		3,792		2,225		2,521		3,320		3,786		4,560		3,935		3,206		2,403		2,940		2,434		4,941		3,267		2,696		1,947		2,926		2,247		4,044		2,693		1,623		2,722		1,814		2,369		9,319		5,165		7,867		4,835		4,798		6,527		4,798		6,527		4,798		6,527		63,550		49,150		7,630		19,260		5,910				10,210		13,538		0		25,080		2,554		5,071		4,336		2,380		9,260		0		0		0		4,848		521,633
Real Estate and Accumulated Depreciation, Initial Cost of Buildings and Improvements	2,734,988		2,644,476		2,346		17,720		15,896		9,630		11,763		29,062		28,370		34,042		34,326		1,941		17,467		22,319		19,408		13,586		9,704		12,615				45,611		35,488		53,170		12,202		60,320		6,672		26,087		6,579		12,044		8,001		9,633		8,543		13,896		11,981		3,096		40,497		6,897		19,352		21,144		18,967		16,152		5,235		10,628		5,780		5,728		8,830		6,423		16,500		3,796		6,311		6,311		8,398		11,871				35,903		35,903		28,035		33,808		33,708		24,916		8,332		15,257		8,146		14,513		22,220		52,189		13,039		11,091		12,698		14,122		5,049		10,767		26,671		8,008		9,803		7,349		4,946		7,302		14,824		5,779		7,134		5,152		7,979		5,945		10,701		6,280		7,926		9,932		6,622		6,180		82,836		4,653		9,579		15,526		15,406		20,958		15,406		20,957		15,406		20,958		154,153		131,238		22,770		84,018		22,450				18,029		12,559		214,095		150,877		12,080		24,694		24,187		15,114		34,650		37,404		48,027		58,537		7,342		90,512
Real Estate and Accumulated Depreciation, Costs Capitalized Subsequent to Acquisition, Improvements	913,386		715,877		304		5,370		3,716		9,798		23,715		23,009		19,134		39,782		10,995		10,248		8,196		14,561		16,641		10,353		5,676		8,264		2,087	[7]	15,401		15,145		428		714		3,948		3,147		13,114		10,413		6,427		5,585		2,992		4,495		7,369		1,263		3,451		11,609		6,777		15,868		8,803		5,692		20,076		2,752		16,371		5,769		1,648		4,888		1,571		3,424		3,156		2,612		5,146		2,937		1,458		41,733		11,338		12,376		4,060		5,991		8,117		3,712		706		(83)		188		3,738		435		15,348		6,548		4,748		4,359		3,696		2,026		27,132		184		5,919		1,291		4,906		190		9,963		(4,387)		7,500		(782)		1,316		21,999		567		(2,251)		4,219		2,394		(1,077)		1,121		2,091		1,507		4,254		219		(18)		(413)		268		551		1,041		67		821		18,442		11,188		1,252		13,803		1,008		13,749		396		0		1,222		1,665		402		2,669		892		990		197		352		(140)		(360)		2,224		197,509
Real Estate and Accumulated Depreciation, Carrying Amount of Land	1,134,347		612,714		50		765		845		1,979		1,048		2,547		2,547		3,577		1,407																		9,633		3,977		22,100		3,399		18,111		2,040		5,476		9,188		4,551		5,248		1,683		1,530		4,201		3,453		1,629		15,167		2,858		5,259		4,725		4,254		4,457		1,722		3,426		2,888		2,070		2,233		1,548		2,371		3,565		2,046		2,046		3,701		5,229		7,997		7,580		7,580		2,348		2,950		2,950		2,287		3,270		5,919		3,175		5,759		5,240		8,007		2,240		3,792		2,198		3,179		3,320		15,620		4,560		3,942		3,212		2,407		2,941		2,464		4,922		3,267		1,671		1,222		2,926		1,809		3,780		2,693		1,623		2,329		2,217		2,377		9,319		5,166		7,867		4,835		4,798		6,527		4,798		6,527		4,798		6,527		63,550		49,150		7,630		19,260		5,910		0		10,210		13,538		0		25,080		2,554		5,071		4,336		2,380		9,260		0		0		0		7,301		521,633
Real Estate and Accumulated Depreciation, Carrying Amount of Buildings and Improvements	3,623,047		3,335,026		2,650		23,090		19,612		19,428		35,474		52,103		47,475		73,824		45,321		12,189		25,663		36,880		36,049		23,939		15,380		20,879		2,087	[7]	51,731		50,985		53,598		12,842		64,268		9,859		39,199		16,725		18,467		13,586		12,642		13,015		21,265		13,244		6,547		52,106		12,983		34,145		29,260		24,702		35,223		7,848		26,786		11,549		7,376		13,718		7,994		19,924		6,952		9,020		11,554		11,335		13,329		41,733		47,242		48,280		32,095		39,799		41,825		28,628		9,834		16,614		9,106		15,244		22,655		67,537		19,587		15,839		17,084		17,160		7,075		26,065		26,855		13,920		11,088		12,251		5,135		17,235		10,456		13,279		7,377		7,193		29,978		6,950		8,714		10,499		10,320		9,248		7,340		8,263		84,343		8,906		9,798		15,508		14,993		21,226		15,957		21,998		15,473		21,779		172,595		142,426		24,022		97,821		23,458		13,749		18,425		12,559		215,317		152,542		12,482		27,363		25,079		16,104		34,847		37,756		47,887		58,177		7,113		288,021
Real Estate and Accumulated Depreciation, Carrying Amount of Land and Buildings and Improvements	4,757,394		3,947,740		2,700	[1]	23,855	[1]	20,457	[1]	21,407		36,522		54,650		50,022		77,401	[2]	46,728	[2]	12,189		25,663		36,880		36,049		23,939		15,380		20,879		2,087	[7]	61,364		54,962		75,698		16,241		82,379		11,899		44,675		25,913		23,018		18,834		14,325		14,545		25,466	[2]	16,697	[2]	8,176		67,273		15,841	[3]	39,404	[3]	33,985	[3]	28,956	[3]	39,680	[4]	9,570		30,212		14,437		9,446		15,951		9,542		22,295		10,517		11,066		13,600		15,036		18,558		49,730		54,822		55,860		34,443		42,749		44,775		30,915		13,104		22,533		12,281		21,003		27,895		75,544		21,827		19,631		19,282		20,339		10,395		41,685		31,415		17,862		14,300		14,658		8,076		19,699		15,378		16,546		9,048		8,415		32,904		8,759		12,494		13,192		11,943	[2]	11,577		9,557		10,640		93,662		14,072		17,665		20,343		19,791		27,753		20,755		28,525		20,271		28,306		236,145	[5]	191,576		31,652		117,081		29,368		13,749		28,635		26,097		215,317		177,622	[6]	15,036	[6]	32,434	[6]	29,415	[6]	18,484	[6]	44,107		37,756		47,887		58,177		14,414		809,654
Real Estate and Accumulated Depreciation, Accumulated Depreciation	$ 756,515		$ 756,515		$ 1,293		$ 10,909		$ 9,913		$ 9,765		$ 17,379		$ 40,489		$ 895		$ 20,802		$ 13,604		$ 8,305		$ 19,147		$ 29,000		$ 18,072		$ 12,394		$ 225		$ 10,966		$ 2,087	[7]	$ 15,325		$ 26,198		$ 415		$ 5,703		$ 1,380		$ 4,889		$ 13,927		$ 9,513		$ 9,456		$ 7,221		$ 4,943		$ 6,375		$ 6,809		$ 6,840		$ 4,413		$ 16,183		$ 5,668		$ 15,193		$ 13,437		$ 7,612		$ 13,717		$ 4,802		$ 8,122		$ 5,119		$ 3,543		$ 3,993		$ 1,998		$ 3,881		$ 3,141		$ 4,494		$ 5,521		$ 1,733		$ 1,593		$ 6,852		$ 11,744		$ 12,818		$ 6,488		$ 8,306		$ 9,330		$ 5,757		$ 1,279		$ 1,874		$ 1,172		$ 1,757		$ 1,621		$ 14,967		$ 1,906		$ 2,121		$ 7,021		$ 10,400		$ 3,193		$ 172		$ 3,307		$ 6,209		$ 5,205		$ 6,204		$ 2,689		$ 8,245		$ 5,633		$ 4,481		$ 3,217		$ 2,824		$ 11,682		$ 2,911		$ 3,684		$ 2,721		$ 5,009		$ 3,633		$ 2,883		$ 4,342		$ 7,926		$ 4,975		$ 1,110		$ 457		$ 446		$ 589		$ 451		$ 655		$ 363		$ 636		$ 17,837		$ 11,851		$ 2,215		$ 7,397		$ 1,065		$ 923		$ 1,262		$ 0		$ 13,857		$ 2,526		$ 830		$ 1,728		$ 1,583		$ 958		$ 2,404		$ 888		$ 1,172		$ 1,239		$ 7,113		$ 0
Real Estate and Accumulated Depreciation, Life Used for Depreciation					35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]	35 years	[8]
Rentable square feet	13,249,780	[9]	13,249,780	[9]	11,789	[9]	100,592	[9]	102,264	[9]	90,156	[9]	122,870	[9]	298,728	[9]	298,728	[9]	241,607	[9]	128,504	[9]	10,457	[9]	165,278	[9]	219,745	[9]	192,476	[9]	136,026	[9]			126,840	[9]			150,167	[9]	150,302	[9]	151,029	[9]	78,000	[9]	321,883	[9]	44,915	[9]	102,864	[9]	88,339	[9]	73,115	[9]	81,067	[9]	60,148	[9]	54,673	[9]	87,405	[9]	72,332	[9]	38,710	[9]	208,464	[9]	52,375	[9]	130,178	[9]	129,752	[9]	114,780	[9]	112,067	[9]	71,000	[9]	141,214	[9]	70,617	[9]	46,759	[9]	65,638	[9]	37,437	[9]	78,880	[9]	68,910	[9]	49,863	[9]	51,500	[9]	41,665	[9]	61,176	[9]	149,817	[9]	147,533	[9]	141,129	[9]	103,979	[9]	130,243	[9]	130,354	[9]	101,236	[9]	53,610	[9]	91,260	[9]	51,516	[9]	88,795	[9]	103,900	[9]	318,000	[9]	50,925	[9]	56,136	[9]	60,662	[9]	76,246	[9]	61,460	[9]	111,318	[9]	174,310	[9]	93,000	[9]	130,536	[9]	90,000	[9]	62,415	[9]	66,400	[9]	132,600	[9]	68,400	[9]	59,630	[9]	43,645	[9]	75,899	[9]	48,709	[9]	90,000	[9]	67,995	[9]	47,212	[9]	75,534	[9]	50,466	[9]	59,790	[9]	271,556	[9]	67,496	[9]	98,551	[9]	46,614	[9]	46,255	[9]	62,920	[9]	46,255	[9]	62,920	[9]	46,255	[9]	62,920	[9]	740,047	[9]	466,490	[9]	92,948	[9]	332,893	[9]	74,430	[9]			130,237	[9]	75,810	[9]	488,470	[9]	416,755	[9]	49,851	[9]	98,982	[9]	84,641	[9]	46,450	[9]	122,103	[9]	111,580	[9]	138,995	[9]	169,412	[9]	(16)	[9]

[1] These properties secure a $11.2 million mortgage note.

[2] These properties secure a $68.6 million mortgage note.

[3] This property secures a $40.5 million mortgage note.

[4] This property secures a $53.6 million mortgage note.

[5] These properties secure a $97.0 million mortgage note.

[6] This property secures a $135.0 million mortgage note.

[7] These costs represent infrastructure costs incurred in 1989. During the third quarter of 2009, we exercised our option to terminate the ground lease at Kilroy Airport Center, Phase IV in Long Beach, California. We had previously leased this land, which is adjacent to our Office Properties at Kilroy Airport Center, Long Beach, for potential future development opportunities.

[8] The initial costs of buildings are depreciated over 35 years using a straight-line method of accounting; improvements capitalized subsequent to acquisition are depreciated over the shorter of the lease term or useful life, generally ranging from one to 20 years.

[9] Includes square footage from our stabilized portfolio.

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Pro Forma Results of the Operating Partnership

12 Months Ended

Dec. 31, 2012

Business Acquisition, Equity Interests Issued or Issuable [Line Items]

Pro Forma Results of the Operating Partnership

Pro Forma Results of the Company (Unaudited)

The first table of pro forma consolidated results of operations of the Company for the years ended December 31, 2012 and 2011 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011. The second table of pro forma consolidated results of operations of the Company for the years ended December 31, 2011 and 2010 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011 and that the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, were completed as of January 1, 2010. Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2011 and 2010, respectively, nor does it intend to be a projection of future results.

	Year EndedDecember 31,
	2012		2011
	(in thousands except per share amounts)
Revenues from continuing operations	$	414,813	$	363,815
Net income available to common stockholders(1)(3)	$	238,947	$	42,601
Net income available to common stockholders per share - basic(1)(3)	$	3.41	$	0.73
Net income available to common stockholders per share - diluted(1)(3)	$	3.41	$	0.73

	Year EndedDecember 31,
	2011		2010
	(in thousands except per share amounts)
Revenues from continuing operations	$	377,871	$	283,941
Net income available to common stockholders(1)(2)(3)	$	41,293	$	2,491
Net income available to common stockholders per share - basic(1)(2)(3)	$	0.71	$	0.03
Net income available to common stockholders per share - diluted(1)(2)(3)	$	0.71	$	0.03

_________________

(1) The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisition of 4100-4700 Bohannon Drive, Menlo Park, CA , 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

(2) The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

(3) The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to common stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

The following table summarizes the results of operations for the properties at 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, from February 29, 2012, July 24, 2012 and December 17, 2012, the dates of acquisition, respectively, through December 31, 2012:

	(in thousands)
Revenues	$	18,943
Net income(1)	$	3,412

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

The following table summarizes the results of operations for the properties at 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, from June 3, 2011 and September 15, 2011, the dates of acquisition, respectively, through December 31, 2011:

	(in thousands)
Revenues	$	15,150
Net income(1)	$	397

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

Kilroy Realty, L.P. [Member]

Business Acquisition, Equity Interests Issued or Issuable [Line Items]

Pro Forma Results of the Operating Partnership

Pro Forma Results of the Operating Partnership (Unaudited)

The first table of pro forma consolidated results of operations of the Operating Partnership for the years ended December 31, 2012 and 2011 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011. The second table of pro forma consolidated results of operations of the Operating Partnership for the years ended December 31, 2011 and 2010 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011 and that the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, were completed as of January 1, 2010. Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2011 and 2010, respectively, nor does it intend to be a projection of future results.

	Year EndedDecember 31,
	2012		2011
	(in thousands except per unit amounts)
Revenues from continuing operations	$	414,813	$	363,815
Net income available to common unitholders(1)(3)	$	244,337	$	43,386
Net income available to common unitholders per unit - basic(1)(3)	$	3.40	$	0.72
Net income available to common unitholders per unit - diluted(1)(3)	$	3.40	$	0.72

	Year EndedDecember 31,
	2011		2010
	(in thousands except per unit amounts)
Revenues from continuing operations	$	377,871	$	283,941
Net income available to common unitholders(1)(2)(3)	$	42,039	$	2,437
Net income available to common unitholders per unit - basic(1)(2)(3)	$	0.70	$	0.03
Net income available to common unitholders per unit - diluted(1)(2)(3)	$	0.70	$	0.03

_______________

(1) The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA and 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

(2) The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

(3) The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

The following table summarizes the results of operations for the properties at 4100-4700 Bohannon Drive, Menlo Park, CA, and 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, from February 29, 2012, July 24, 2012, and December 17, 2012, the dates of acquisition, respectively, through December 31, 2012:

	(in thousands)
Revenues	$	18,943
Net income(1)	$	3,412

_______________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

The following table summarizes the results of operations for the properties at 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, from June 3, 2011 and September 15, 2011, the dates of acquisition, respectively, through December 31, 2011:

	(in thousands)
Revenues	$	15,150
Net income(1)	$	397

_______________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

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Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2012

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block]

A summary of our stock option activity from January 1, 2012 through December 31, 2012 is presented below:

	Number of Options		Exercise Price	Remaining Contractual Term (years)
Outstanding at January 1, 2012 (1)	5,000		$25.77
Granted	1,550,000		42.61
Exercised (1)	(5,000	)	25.77
Forfeited	(10,000	)	42.61
Outstanding at December 31, 2012 (2)(3)	1,540,000		$42.61	9.2

________________________

(1) Stock options outstanding as of December 31, 2011 were granted in 2002 and exercised in 2012 prior to expiration. No stock options were granted during 2003 through 2011.

(2) As of December 31, 2012, none of the outstanding stock options were exercisable.

(3) The total intrinsic value of options outstanding at December 31, 2012 was $7.3 million.

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on the following assumptions for the February 2012 grant.

	February 2012 Option Grant
Fair value of options granted per share	$9.20
Expected stock price volatility	33.00%
Risk-free interest rate	1.35%
Dividend yield	3.80%
Expected life of option	6.5 years

Schedule of Share-based Payment Award, Restricted Stock Units, Valuation Assumptions [Table Text Block]

	March 2012 Market Measure-based RSU Grant
Grant date fair value per share	$41.20
Expected share price volatility	31.00%
Risk-free interest rate	1.60%
Dividend yield	3.80%
Expected life	7 years

Summary of Restricted Stock Units

A summary of our time-based RSU activity from January 1, 2012 through December 31, 2012 is presented below:

	Nonvested RSUs
Nonvested and Vested Restricted Stock Units	Amount		Weighted-Average Grant Date Fair Value		Vested RSUs		Total RSUs
Outstanding at January 1, 2012	147,961		$	32.18	694,714		842,675
Granted (1)	204,829		44.34		—		204,829
Vested	(73,688	)	38.91		73,688		—
Settled (2)					(19,955	)	(19,955	)
Issuance of dividend equivalents (3)					28,368		28,368
Canceled (2) (4)					(7,054	)	(7,054	)
Outstanding as of December 31, 2012	279,102		$	41.30	769,761		1,048,863

 _______________________

(1) Includes 103,239 RSUs issued to the Company's Chief Executive Officer, as described above.

(2) In August 2012 and December 2012, certain vested RSUs were settled in shares of the Company's common stock.

(3) RSUs issued as dividend equivalents are vested upon issuance.

(4) We accept the return of RSUs, at the current quoted market price of the Company's common stock, to satisfy minimum statutory tax-withholding requirements related to either RSUs that have vested or RSU dividend equivalents in accordance with the terms of the 2006 Plan.

Summary of Nonvested and Vested Restricted Stock Units

A summary of our time-based RSU activity for the years ended December 31, 2012, 2011, and 2010 is presented below:

	RSUs Granted			RSUs Vested
Year Ended	Non-Vested RSUs Issued	Weighted- Average Grant-Date Fair Value		Vested RSUs		Total Vest-Date Fair Value (1)         (in thousands)
2012	204,829	$	44.34	(73,688	)	$	3,118
2011	107,673	37.94		(85,466	)	3,273
2010	159,606	30.24		(303,146	)	10,936

________________________

(1) Total fair value of RSUs vested was calculated based on the quoted closing share price of the Company's common stock on the NYSE on the day of vesting.

Summary of nonvested shares

A summary of our nonvested shares activity from January 1, 2012 through December 31, 2012 is presented below:

Nonvested Shares	Shares		Weighted-Average Grant-Date Fair Value
Outstanding at January 1, 2012	83,966		$	39.83
Granted	62,137		41.84
Vested (1)	(50,862	)	41.29
Outstanding as of December 31, 2012	95,241		$	40.42

_______________

(1) The total shares vested include 18,766 of shares that were then tendered to satisfy minimum statutory tax withholding requirements related to the restricted shares that have vested in accordance with the terms of the 2006 Plan. We accept the return of shares at the current quoted market price of the Company's common stock to satisfy tax obligations.

Summary of nonvested and vested shares

A summary of our nonvested and vested shares activity for the years ended December 31, 2012, 2011, and 2010 is presented below:

	Shares Granted			Shares Vested
Year Ended	Non-Vested Shares Issued	Weighted- Average Grant-Date Fair Value		Vested Shares		Total Vest-Date Fair Value (1)          (in thousands)
2012	62,137	$	41.84	(50,862	)	$	2,110
2011	68,727	37.83		(34,793	)	1,334
2010	3,239	30.88		(41,680	)	1,398

_______________________

(1) Total fair value of shares vested was calculated based on the quoted closing share price of the Company's common stock on the NYSE on the day of vesting.

XML

Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	$ 36,202		$ 30,499		$ 17,987
Deferred Leasing Costs [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	20,804	[1]	16,905	[1]	13,344	[1]
Estimated annual amortization related to acquisition-related intangibles
2013	22,676
2014	20,235
2015	16,377
2016	13,757
2017	11,421
Thereafter	22,178
Finite-lived intangible assets/liabilities, net	106,644
Above Market Leases [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	5,695	[2]	5,946	[2]	2,163	[2]
Estimated annual amortization related to acquisition-related intangibles
2013	5,316	[3]
2014	4,336	[3]
2015	2,533	[3]
2016	1,506	[3]
2017	1,185	[3]
Thereafter	921	[3]
Finite-lived intangible assets/liabilities, net	15,797	[3]
In-Place Leases [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	21,976	[1]	12,575	[1]	3,266	[1]
Estimated annual amortization related to acquisition-related intangibles
2013	23,298
2014	15,567
2015	9,913
2016	6,798
2017	5,417
Thereafter	6,049
Finite-lived intangible assets/liabilities, net	67,042
Below-Market Ground Lease Obligation [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization for the period related to deferred leasing costs and acquisition-related intangibles	205	[4]	0	[4]	0	[4]
Estimated annual amortization related to acquisition-related intangibles
2013	8	[5]
2014	8	[5]
2015	8	[5]
2016	8	[5]
2017	8	[5]
Thereafter	445	[5]
Finite-lived intangible assets/liabilities, net	485	[5]
Below Market Leases [Member]
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization Of Intangible Liabilities	(12,393)	[6]	(4,890)	[6]	(786)	[6]
Estimated annual amortization related to acquisition-related intangibles
2013	13,140	[7]
2014	(11,360)	[7]
2015	(8,828)	[7]
2016	(6,645)	[7]
2017	(5,577)	[7]
Thereafter	(7,381)	[7]
Total	52,931	[7]
Leases Acquired In Place Above Market Ground Leases Adjustment Member
Amortization for the period related to deferred leasing costs and acquisition-related intangibles
Amortization Of Intangible Liabilities	(85)	[8]	(37)	[8]	0	[8]
Estimated annual amortization related to acquisition-related intangibles
2013	101	[9]
2014	(101)	[9]
2015	(101)	[9]
2016	(101)	[9]
2017	(101)	[9]
Thereafter	(5,693)	[9]
Total	$ 6,198	[9]

[1] The amortization of deferred leasing costs and in-place leases is recorded to depreciation and amortization expense in the consolidated statements of operations for the periodspresented.

[2] The amortization of above-market operating leases is recorded as a decrease to rental income in the consolidated statements of operations for the periods presented.

[3] Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations.

[4] The amortization of the below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented.

[5] Represents estimated annual amortization related to below−market ground lease obligations. Amounts will be recorded as an increase to ground lease expense in the consolidated statements of operations.

[6] The amortization of below−market operating leases is recorded as an increase to rental income in the consolidated statements of operations for the periods presented.

[7] Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations.

[8] The amortization of the above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented.

[9] Represents estimated annual amortization related to above−market ground lease obligations. Amounts will be recorded as a decrease to ground lease expense in the consolidated statements of operations.

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
REAL ESTATE ASSETS (Notes 3, 17, and 18):
Land and improvements	$ 612,714	$ 537,574
Buildings and improvements	3,335,026	2,830,310
Undeveloped land and construction in progress	809,654	430,806
Total real estate held for investment	4,757,394	3,798,690
Accumulated depreciation and amortization	(756,515)	(742,503)
Total real estate held for investment, net ($319,770 and $101,352 of VIE, Note 2)	4,000,879	3,056,187
REAL ESTATE ASSETS AND OTHER ASSETS HELD FOR SALE, NET (Note 17)	0	84,156
CASH AND CASH EQUIVALENTS	16,700	4,777
RESTRICTED CASH (Note 17)	247,544	358
MARKETABLE SECURITIES (Notes 13 and 16)	7,435	5,691
CURRENT RECEIVABLES, NET (Note 5)	9,220	8,395
DEFERRED RENT RECEIVABLES, NET (Note 5)	115,418	101,142
DEFERRED LEASING COSTS AND ACQUISITION-RELATED INTANGIBLE ASSETS, NET (Notes 3 and 4)	189,968	155,522
DEFERRED FINANCING COSTS, NET (Notes 2 and 7)	18,971	18,368
PREPAID EXPENSES AND OTHER ASSETS, NET	9,949	12,199
TOTAL ASSETS	4,616,084	3,446,795
LIABILITIES:
Secured debt (Notes 3, 6, 7 and 16)	561,096	351,825
Exchangeable senior notes, net (Notes 6, 7 and 16)	163,944	306,892
Unsecured debt, net (Notes 6, 7 and 16)	1,130,895	980,569
Unsecured line of credit (Notes 6, 7 and 16)	185,000	182,000
Accounts payable, accrued expenses and other liabilities (Note 15)	154,734	81,713
Accrued distributions (Note 10)	28,924	22,692
Deferred revenue and acquisition-related intangible liabilities, net (Notes 3, 4 and 8)	117,904	79,781
Rents received in advance and tenant security deposits	37,654	26,917
Liabilities and deferred revenue of real estate assets held for sale (Note 17)	0	13,286
Total liabilities	2,380,151	2,045,675
COMMITMENTS AND CONTINGENCIES (Note 15)
NONCONTROLLING INTEREST (Note 9):
7.45% Series A Cumulative Redeemable Preferred units of the Operating Partnership	0	73,638
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Cumulative Redeemable Preferred stock	0	0
Common stock, $.01 par value, 150,000,000 shares authorized, 74,926,981 and 58,819,717 shares issued and outstanding, respectively	749	588
Additional paid-in capital	2,126,005	1,448,997
Distributions in excess of earnings	(129,535)	(277,450)
Total stockholders' equity	2,189,630	1,293,717
Noncontrolling interest:
Common units of the Operating Partnership	46,303	33,765
Total equity	2,235,933	1,327,482
TOTAL LIABILITIES, NONCONTROLLING INTEREST AND EQUITY	4,616,084	3,446,795
Series E Cumulative Redeemable Preferred Stock [Member]
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Cumulative Redeemable Preferred stock	0	38,425
Series F Cumulative Redeemable Preferred Stock
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Cumulative Redeemable Preferred stock	0	83,157
Series G Cumulative Redeemable Preferred Stock [Member]
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Cumulative Redeemable Preferred stock	96,155	0
Series H Cumulative Redeemable Preferred Stock [Member]
Preferred stock, $.01 par value, 30,000,000 shares authorized:
Cumulative Redeemable Preferred stock	$ 96,256	$ 0

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Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Basis of Presentation and Significant Accounting Policies [Abstract]

Property, Plant and Equipment [Table Text Block]

Asset Description	Depreciable Lives
Buildings and improvements	25 – 40 years
Tenant improvements	1 – 20 years(1)

________________________

(1) Tenant improvements are amortized over the shorter of the lease term or the estimated useful life.

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Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Summary of minimum commitment
2013	$ 3,685
2014	3,095
2015	3,095
2016	3,095
2017	3,095
Thereafter	160,007
Total	$ 176,072	[1],[2],[3],[4],[5]

[1] Reflects the minimum ground lease obligations before the impact of ground lease extension options.

[2] One of our ground lease obligations is subject to a fair market value adjustment every five years based on a combination of CPI adjustments and third-party appraisals limited to maximum increases annually. The contractual obligations included above assumes the annual lease rental obligation in effect as of December 31, 2012.

[3] One of our ground lease obligations is subject to a fair market value adjustment every five years; however, the lease includes ground rent subprotection and infrastructure rent credits which currently limit our annual rental obligations to $1.0 million. The contractual obligations for that ground lease included above assumes the lesser of $1.0 million or annual lease rental obligation in effect as of December 31, 2012.

[4] As previously discussed, the Company exercised the land purchase option included in the 360 3rd Street ground lease and will acquire the land in the second quarter of 2013. The amount presented above includes payments through the second quarter of 2013 and excludes the purchase price of $27.5 million.

[5] One of our ground lease obligations includes a component which is based on the percentage of gross income that exceeds the minimum ground rent. The minimum rent is subject to increases every five years based on 50% of the average annual percentage rent for the previous five years. Currently, gross income does not exceed the threshold requiring us to pay percentage rent. The contractual obligations for that ground lease included above assumes the annual lease rental obligation in effect as of December 31, 2012.

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Schedule II Valuation and Qualifying Accounts Schedule II Valuation and Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Allowance for Uncollectible Tenant Receivables [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 2,590		$ 2,819		$ 3,063
Charged to Costs and Expenses	(42)	[1]	923	[1]	16	[1]
Deductions	33		(1,152)		(260)
Balance at End of Period	2,581		2,590		2,819
Allowance for Unbilled Deferred Rent [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	3,406		3,831		6,388
Charged to Costs and Expenses	0	[1]	(279)	[1]	(1,079)	[1]
Deductions	(799)		(146)		(1,478)
Balance at End of Period	$ 2,607		$ 3,406		$ 3,831

[1] Includes amounts reported in Discontinued Operations (see Note 17).

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Consolidated Statements of Equity (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Dividends declared, per common share and common unit	$ 1.4	$ 1.4	$ 1.4
3.25% Exchangeable Notes [Member] | Exchangeable Notes [Member]
Stated interest rate			3.25%

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Employee Benefit Plans Employee Benefit Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 Months	Dec. 31, 2011	Dec. 31, 2010
Defined Benefit Plan Disclosure [Line Items]
Eligibility period for 401K savings plan, number of months	3
Defined Contribution Plan, Contributions by Employee, Percent	60.00%
Defined Contribution Plan, Employer Matching Contribution	$ 0.50
Defined Contribution Plan, Employer Matching Contribution, Percent	10.00%
Defined Contribution Plan, Cost Recognized	700,000	600,000	500,000
Deferred Compensation, Employee Salary, Percent	70.00%
Deferred Compensation, Directors Fees and Employee Bonuses, Percent	100.00%
Deferred Compensation Arrangement with Individual, Employer Contribution, Percent	10.00%
Fair Value (Level 1) [Member]
Defined Benefit Plan Disclosure [Line Items]
Deferred Compensation Liability, Current and Noncurrent	$ 7,339,000	$ 5,597,000

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Net Income Available to Common Stockholders Per Share of the Company (Tables)

12 Months Ended

Dec. 31, 2012

Earnings Per Share [Abstract]

Net income available to common stockholders

The following table reconciles the numerator and denominator in computing the Company's basic and diluted per-share computations for net income available to common stockholders for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands, except share and per share amounts)
Numerator:
Income (loss) from continuing operations	$	5,447		$	(3,728	)	(427		)
Loss from continuing operations attributable to noncontrolling common units of the Operating Partnership	383			545			468
Preferred distributions and dividends	(21,088		)	(15,196		)	(15,196		)
Allocation to participating securities (nonvested shares and time-based RSUs)	(1,602		)	(1,309		)	(1,151		)
Numerator for basic and diluted loss from continuing operations available to common stockholders	(16,860		)	(19,688		)	(16,306		)
Income from discontinued operations	271,654			71,217			20,313
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership	(6,570		)	(2,019		)	(646		)
Numerator for basic and diluted net income available to common stockholders	$	248,224		$	49,510		$	3,361
Denominator:
Basic weighted average vested shares outstanding	69,639,623			56,717,121			49,497,487
Effect of dilutive securities—contingently issuable shares and stock options	—			—			—
Diluted weighted average vested shares and common share equivalents outstanding	69,639,623			56,717,121			49,497,487
Basic earnings per share:
Loss from continuing operations available to common stockholders per share	$	(0.24	)	$	(0.35	)	$	(0.33	)
Income from discontinued operations per common share	3.80			1.22			0.40
Net income available to common stockholders per share	$	3.56		$	0.87		$	0.07
Diluted earnings per share:
Loss from continuing operations available to common stockholders per share	$	(0.24	)	$	(0.35	)	$	(0.33	)
Income from discontinued operations per common share	3.80			1.22			0.40
Net income available to common stockholders per share	$	3.56		$	0.87		$	0.07

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Fair Value Measurements and Disclosures (Details 1) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Liabilities
Secured Debt	$ 561,096,000		$ 351,825,000
Exchangeable notes	163,944,000		306,892,000
Unsecured Debt	1,130,895,000		980,569,000
Credit Facility	185,000,000		182,000,000
Fair Value [Member]
Liabilities
Secured Debt	591,993,000	[1]	367,402,000	[1]
Exchangeable notes	181,223,000	[1]	320,919,000	[1]
Unsecured Debt	1,254,047,000	[2]	1,011,982,000	[2]
Credit Facility	185,049,000	[1]	182,299,000	[1]
Fair Value [Member] | Level 2 [Member]
Liabilities
Unsecured Debt	558,000,000		88,900,000
Carrying Value [Member]
Liabilities
Secured Debt	561,096,000	[1]	351,825,000	[1]
Exchangeable notes	163,944,000	[1]	306,892,000	[1]
Unsecured Debt	1,130,895,000	[2]	980,569,000	[2]
Credit Facility	185,000,000	[1]	182,000,000	[1]
Carrying Value [Member] | Level 2 [Member]
Liabilities
Unsecured Debt	601,000,000		83,000,000
Unsecured Debt [Member] | Fair Value [Member] | Level 1 [Member]
Liabilities
Debt	573,000,000		923,100,000
Unsecured Debt [Member] | Carrying Value [Member] | Level 1 [Member]
Liabilities
Debt	$ 653,000,000		$ 897,600,000

[1] Fair value calculated using Level II inputs which are based on model-derived valuations in which significant inputs and significant value drivers are observable in active markets.

[2] Fair value calculated primarily using Level I inputs which are based on quoted prices for identical instruments in active markets. The carrying value and fair value of the Level I instruments was $653.0 million and $573.0 million, respectively, as of December 31, 2012. The carrying value and fair value of the Level I instruments at December 31, 2011, was $897.6 million and $923.1 million, respectively. The carrying value and fair value of the Level II instruments was $601.0 million and $558.0 million, respectively, as of December 31, 2012. The carrying value and fair value of the Level II instruments at December 31, 2011, was $83.0 million and $88.9 million, respectively.

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Tax Treatment of Distributions

12 Months Ended

Dec. 31, 2012

Tax Treatment of Distributions [Abstract]

Tax Treatment of Distributions

Tax Treatment of Distributions

The following table reconciles the dividends declared per common share to the dividends paid per common share during the years ended December 31, 2012, 2011, and 2010 as follows:

	Year Ended December 31,
Dividends	2012		2011		2010
Dividends declared per common share	1.400		1.400		1.400
Less: Dividends declared in the current year and paid in the following year	(0.350	)	(0.350	)	(0.350	)
Add: Dividends declared in the prior year and paid in the current year	0.350		0.350		0.350
Dividends paid per common share	1.400		1.400		1.400

The unaudited income tax treatment for the dividends to common stockholders reportable for the years ended December 31, 2012, 2011, and 2010 as identified in the table above was as follows:

	Year Ended December 31,
Common Shares	2012				2011				2010
Ordinary income	$	0.577	41.21	%	$	0.230	16.43	%	$	—	—	%
Return of capital	0.823		58.79		1.170		83.57		1.400		100.00
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	1.400	100.00	%	$	1.400	100.00	%	$	1.400	100.00	%

_________________

(1) Capital gains are comprised entirely of 15% rate gains.

The unaudited income tax treatment for the dividends to Series E preferred stockholders reportable for the years ended December 31, 2012, 2011, and 2010 is seen in the table below. Series E preferred stock was redeemed on April 16, 2012.

	Year Ended December 31,
Preferred Shares	2012				2011				2010
Ordinary income	$	0.818	100.00	%	$	1.950	100.00	%	$	1.950	100.00	%
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	0.818	100.00	%	$	1.950	100.00	%	$	1.950	100.00	%

__________________

(1) Capital gains are comprised entirely of 15% rate gains.

The unaudited income tax treatment for the dividends to Series F preferred stockholders reportable for the years ended December 31, 2012, 2011, and 2010 is seen in the table below. Series F preferred stock was redeemed on April 16, 2012.

	Year Ended December 31,
Preferred Shares	2012				2011				2010
Ordinary income	$	0.786	100.00	%	$	1.875	100.00	%	$	1.875	100.00	%
Capital gains (1)	—		—		—		—		—		—
Unrecaptured section 1250 gains	—		—		—		—		—		—
	$	0.786	100.00	%	$	1.875	100.00	%	$	1.875	100.00	%

_________________

(1) Capital gains are comprised entirely of 15% rate gains.

The 6.875% Series G Cumulative Redeemable Preferred Stock was issued in March 2012. The unaudited income tax treatment for the dividends to Series G preferred stockholders reportable for the year ended December 31, 2012 was as follows:

	Year Ended December 31,
Preferred Shares	2012
Ordinary income	$	1.089	100.00	%
Capital gains (1)	—		—
Unrecaptured section 1250 gains	—		—
	$	1.089	100.00	%

__________________

(1) Capital gains are comprised entirely of 15% rate gains.

The 6.375% Series H Cumulative Redeemable Preferred Stock was issued in August 2012. The unaudited income tax treatment for the dividends to Series H preferred stockholders reportable for the year ended December 31, 2012 was as follows:

	Year Ended December 31,
Preferred Shares	2012
Ordinary income	$	0.398	100.00	%
Capital gains (1)	—		—
Unrecaptured section 1250 gains	—		—
	$	0.398	100.00	%

__________________

(1) Capital gains are comprised entirely of 15% rate gains.

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Pro Forma Results of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2012

Pro forma results of the operating partnership

The first table of pro forma consolidated results of operations of the Company for the years ended December 31, 2012 and 2011 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011. The second table of pro forma consolidated results of operations of the Company for the years ended December 31, 2011 and 2010 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011 and that the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, were completed as of January 1, 2010. Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2011 and 2010, respectively, nor does it intend to be a projection of future results.

	Year EndedDecember 31,
	2012		2011
	(in thousands except per share amounts)
Revenues from continuing operations	$	414,813	$	363,815
Net income available to common stockholders(1)(3)	$	238,947	$	42,601
Net income available to common stockholders per share - basic(1)(3)	$	3.41	$	0.73
Net income available to common stockholders per share - diluted(1)(3)	$	3.41	$	0.73

	Year EndedDecember 31,
	2011		2010
	(in thousands except per share amounts)
Revenues from continuing operations	$	377,871	$	283,941
Net income available to common stockholders(1)(2)(3)	$	41,293	$	2,491
Net income available to common stockholders per share - basic(1)(2)(3)	$	0.71	$	0.03
Net income available to common stockholders per share - diluted(1)(2)(3)	$	0.71	$	0.03

_________________

(1) The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisition of 4100-4700 Bohannon Drive, Menlo Park, CA , 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

(2) The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

(3) The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to common stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

Actual results for certain operating data for the property

The following table summarizes the results of operations for the properties at 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, from February 29, 2012, July 24, 2012 and December 17, 2012, the dates of acquisition, respectively, through December 31, 2012:

	(in thousands)
Revenues	$	18,943
Net income(1)	$	3,412

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

The following table summarizes the results of operations for the properties at 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, from June 3, 2011 and September 15, 2011, the dates of acquisition, respectively, through December 31, 2011:

	(in thousands)
Revenues	$	15,150
Net income(1)	$	397

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

Kilroy Realty, L.P. [Member]

Pro forma results of the operating partnership

The first table of pro forma consolidated results of operations of the Operating Partnership for the years ended December 31, 2012 and 2011 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011. The second table of pro forma consolidated results of operations of the Operating Partnership for the years ended December 31, 2011 and 2010 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011 and that the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, were completed as of January 1, 2010. Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2011 and 2010, respectively, nor does it intend to be a projection of future results.

	Year EndedDecember 31,
	2012		2011
	(in thousands except per unit amounts)
Revenues from continuing operations	$	414,813	$	363,815
Net income available to common unitholders(1)(3)	$	244,337	$	43,386
Net income available to common unitholders per unit - basic(1)(3)	$	3.40	$	0.72
Net income available to common unitholders per unit - diluted(1)(3)	$	3.40	$	0.72

	Year EndedDecember 31,
	2011		2010
	(in thousands except per unit amounts)
Revenues from continuing operations	$	377,871	$	283,941
Net income available to common unitholders(1)(2)(3)	$	42,039	$	2,437
Net income available to common unitholders per unit - basic(1)(2)(3)	$	0.70	$	0.03
Net income available to common unitholders per unit - diluted(1)(2)(3)	$	0.70	$	0.03

_______________

(1) The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA and 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

(2) The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

(3) The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

Actual results for certain operating data for the property

The following table summarizes the results of operations for the properties at 4100-4700 Bohannon Drive, Menlo Park, CA, and 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, from February 29, 2012, July 24, 2012, and December 17, 2012, the dates of acquisition, respectively, through December 31, 2012:

	(in thousands)
Revenues	$	18,943
Net income(1)	$	3,412

_______________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

The following table summarizes the results of operations for the properties at 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, from June 3, 2011 and September 15, 2011, the dates of acquisition, respectively, through December 31, 2011:

	(in thousands)
Revenues	$	15,150
Net income(1)	$	397

_______________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

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Deferred Revenue and Acquisition Related Liabilities, net

12 Months Ended

Dec. 31, 2012

Deferred Revenue [Abstract]

Deferred Revenue and Acquisition Related Liabilities, net

Deferred Revenue and Acquisition Related Liabilities, net

Deferred revenue and acquisition-related liabilities, net consisted of the following at December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Deferred revenue related to tenant-funded tenant improvements	$	56,461	$	41,884
Other deferred revenue	2,314		1,310
Acquisition-related intangible liabilities, net (1)	59,129		36,587
Total	$	117,904	$	79,781

________________________

(1) See Note 4 for additional information.

Deferred Revenue Related to Tenant-funded Tenant Improvements

During the years ended December 31, 2012, 2011, and 2010, $9.1 million, $9.3 million, and $9.7 million, respectively, of deferred revenue related to tenant-funded tenant improvements (including discontinued operations) was amortized and recognized as rental income. The following is the estimated amortization of deferred revenue related to tenant-funded tenant improvements as of December 31, 2012 for the next five years and thereafter:

Year Ending	(in thousands)
2013	$	10,054
2014	9,339
2015	8,255
2016	7,825
2017	6,409
Thereafter	14,579
Total	$	56,461

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Quarterly Financial Information of the Company (Unaudited)

12 Months Ended

Dec. 31, 2012

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Information of the Company

Quarterly Financial Information of the Company (Unaudited)

Summarized quarterly financial data for the years ended December 31, 2012 and 2011 was as follows:

	2012 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	92,397		$	97,111		$	104,293		$	111,111
Net Operating Income from continuing operations (2)(3)	67,791			68,437			72,251			79,276
Income (loss) from continuing operations (3)	2,165			36			(665		)	3,911
Income from discontinued operations (3)	76,506			2,241			3,187			189,720
Net income	78,671			2,277			2,522			193,631
Net income attributable to Kilroy Realty Corporation	76,876			2,297			2,589			189,152
Preferred dividends and distributions	(9,336		)	(3,097		)	(5,342		)	(3,313		)
Net income (loss) available to common stockholders	67,540			(800		)	(2,753		)	185,839
Net income (loss) available to common stockholders per share—basic	1.06			(0.02		)	(0.04		)	2.49
Net income (loss) available to common stockholders per share—diluted	1.06			(0.02		)	(0.04		)	2.45
	2011 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	76,003		$	81,002		$	86,398		$	94,226
Net Operating Income from continuing operations (2)(3)	53,660			56,910			60,268			67,777
Income from continuing operations (3)	750			(1,071		)	(3,391		)	(16		)
Income from discontinued operations (3)	4,117			4,543			17,681			44,876
Net income	4,867			3,472			14,290			44,860
Net income attributable to Kilroy Realty Corporation	4,833			3,482			13,994			43,706
Preferred dividends and distributions	(3,799		)	(3,799		)	(3,799		)	(3,799		)
Net income (loss) available to common stockholders	1,034			(317		)	10,195			39,907
Net income (loss) available to common stockholders per share—basic	0.01			(0.01		)	0.17			0.68
Net income (loss) available to common stockholders per share—diluted	0.01			(0.01		)	0.17			0.68

____________________

(1) The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding.  The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

(2) Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

(3) All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

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Fair Value Measurements and Disclosures (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Assets and Liabilities Reported at Fair Value
Marketable securities	$ 7,435		$ 5,691
Fair value adjustment of marketable securities and deferred compensation plan liability
Net loss (gain) on marketable securities	723		(153)		435
Fair Value (Level 1) [Member]
Assets and Liabilities Reported at Fair Value
Marketable securities	7,435	[1],[2]	5,691	[1],[2]
Deferred compensation plan liability	$ 7,339		$ 5,597

[1] Based on quoted prices in active markets for identical securities.

[2] The marketable securities are held in a limited rabbi trust.

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Stockholders' Equity of the Company

12 Months Ended

Dec. 31, 2012

Equity [Abstract]

Stockholders' Equity of the Company

Stockholders' Equity of the Company

Preferred Stock Issuances

6.375% Series H and 6.875% Series G Cumulative Redeemable Preferred Stock

In August 2012, the Company issued 4,000,000 shares of its 6.375% Series H Cumulative Redeemable Preferred Stock ("Series H Preferred Stock") at a public offering price of $25.00 per share, for a total of approximately $96.2 million of net proceeds, after deducting the underwriting discount and other offering-related costs. We used a portion of the net proceeds to redeem the Series A Preferred Units as discussed in Note 9 and the remaining portion for general corporate purposes. Dividends on the Series H Preferred Stock are cumulative and are payable quarterly in arrears on the 15th day of each February, May, August and November, commencing November 15, 2012. The Series H Preferred Stock is presented in stockholders' equity on the consolidated balance sheet net of issuance costs.

In March 2012, the Company issued 4,000,000 shares of its 6.875% Series G Cumulative Redeemable Preferred Stock ("Series G Preferred Stock") at a public offering price of $25.00 per share, for a total of approximately $96.2 million of net proceeds, after deducting the underwriting discount and other offering-related costs. We used the net proceeds to redeem the Series E Preferred and Series F Preferred Stock as discussed below. Dividends on the Series G Preferred Stock are cumulative and are payable quarterly in arrears on the 15th day of each February, May, August and November, commencing May 15, 2012. The Series G Preferred Stock is presented in stockholders' equity on the consolidated balance sheet net of issuance costs.

The outstanding shares of the Series G Preferred Stock and the Series H Preferred Stock do not have a stated maturity date and are not subject to any sinking fund or mandatory redemption. Upon liquidation, dissolution or winding up, the Series G Preferred Stock and the Series H Preferred Stock will rank senior to the Company's common stock with respect to the payment of distributions and other amounts. Holders of the Series G Preferred Stock and the Series H Preferred Stock generally have no voting rights except for limited voting rights if the Company fails to pay dividends for six or more quarterly dividend periods (whether or not consecutive). The Company may not redeem the Series G Preferred Stock prior to March 27, 2017 nor the Series H Preferred Stock prior to August 15, 2017, except in limited circumstances relating to the Company’s continuing qualification as a REIT and upon certain specified change in control transactions in which the Company’s shares of common stock and the acquiring or surviving entity common securities would not be listed on the NYSE, NYSE Amex or NASDAQ, or any successor exchanges. On or after March 27, 2017 or August 15, 2017, the Company may, at its option, redeem the Series G Preferred Stock or the Series H Preferred Stock, respectively, in whole or in part at any time or from time to time, by payment of $25.00 per share in cash, plus any accumulated, accrued and unpaid distributions through the date of redemption. Upon the occurrence of a specified change of control transaction, the Company may, at its option, redeem the Series G Preferred Stock or the Series H Preferred Stock in whole or in part within 120 days after the change of control occurred, by paying $25.00 per share in cash, plus any accrued and unpaid distributions through the date of redemption. If the Company does not exercise its right to redeem the Series G Preferred Stock or the Series H Preferred Stock upon the occurrence of a specified change of control transaction, the holders of Series G Preferred Stock and the Series H Preferred Stock have the right to convert some or all of their shares into a number of the Company’s shares of common stock based on a pre-determined formula subject to a maximum share cap of 4,390,000 shares of common stock for the Series G Preferred Stock and 4,187,600 shares of common stock for the Series H Preferred Stock.

Preferred Stock Redemption

7.80% Series E and 7.50% Series F Cumulative Redeemable Preferred Stock

On April 16, 2012 (the "Series E and F Redemption Date"), the Company redeemed all 1,610,000 outstanding shares of its 7.80% Series E Cumulative Redeemable Preferred Stock ("Series E Preferred Stock") and all 3,450,000 outstanding shares of its 7.50% Series F Cumulative Redeemable Preferred Stock ("Series F Preferred Stock"). On the Series E and F Redemption Date, the shares of Series E and Series F Preferred Stock (together, the “Redeemed Preferred Stock”) were redeemed at a redemption price equal to their stated liquidation preference of $25.00 per share, representing $126.5 million in aggregate, plus all accrued and unpaid dividends to the Series E and F Redemption Date. As of December 31, 2011, all 1,610,000 Series E Preferred Stock and all 3,450,000 Series F Preferred Stock were outstanding.

During the year ended December 31, 2012, we recognized a non-recurring non-cash charge of $4.9 million as a reduction to net income available to common stockholders for the original issuance costs related to the Redeemed Preferred Stock.

Common Stock

Issuance of Common Stock

In August 2012, the Company completed an underwritten public offering of 5,750,000 shares of its common stock. The net offering proceeds, after deducting sales agent compensation and offering expenses, were approximately $253.8 million. We used a portion of the net proceeds from the offering to fund acquisitions, repay borrowings under the revolving credit facility, and for general corporate purposes.

In February 2012, the Company completed an underwritten public offering of 9,487,500 shares of its common stock. The net offering proceeds, after deducting sales agent compensation and offering expenses, were approximately $382.1 million. We used a portion of the net proceeds from the offering to fund acquisitions, repay borrowings under the revolving credit facility, and for general corporate purposes.

In April 2011, the Company completed an underwritten public offering of 6,037,500 shares of its common stock. The net offering proceeds, after deducting sales agent compensation and offering expenses, were approximately $221.0 million. We used a portion of the net proceeds from the offering to fund acquisitions and for general corporate purposes.

In April 2010, the Company completed an underwritten public offering of 9,200,000 shares of its common stock. The net offering proceeds, after deducting sales agent compensation and offering expenses, were approximately $299.8 million. We used a portion of the net proceeds from the offering to fund acquisitions, repay borrowings under the prior revolving credit facility, and for general corporate purposes.

At-The-Market Stock Offering Program

Under our at-the-market stock offering program, which commenced in July 2011, we may offer and sell shares of our common stock having an aggregate gross sales price of up to $200.0 million from time to time in "at the market" offerings. During the year ended December 31, 2012, we sold 787,118 shares of common stock under this program for aggregate gross proceeds of approximately $37.0 million and net proceeds of approximately $36.3 million, after sales agent compensation. During the year ended December 31, 2011, we sold 355,305 shares of common stock under this program for aggregate gross proceeds of approximately $13.0 million and net proceeds of approximately $12.8 million, after sales agent compensation. The proceeds from the sales were used to fund acquisitions and general corporate purposes including repayment of borrowings under the revolving credit facility. Since commencement of the program, we have sold 1,142,423 shares of common stock and, as of December 31, 2012, approximately $150.0 million remains available to be sold under this program. Actual future sales will depend upon a variety of factors including but not limited to market conditions, the trading price of the Company's common stock and our capital needs. We have no obligation to sell the remaining shares available for sale under this program.

Dividend Reinvestment and Direct Purchase Plan

During the year ended December 31, 2011, the Company had a Dividend Reinvestment and Direct Purchase Plan (the “DRIP Plan”) designed to provide the Company’s stockholders and other investors with a convenient and economical method to purchase shares of the Company’s common stock. As of December 31, 2011, no shares had been acquired under the DRIP Plan from new issuances. We terminated the DRIP Plan effective as of January 12, 2012.

Share Repurchases

An aggregate of 988,025 shares currently remain eligible for repurchase under a share-repurchase program approved by the Company’s board of directors in prior periods. The Company did not repurchase shares of common stock under this program during the years ended December 31, 2012, 2011 or 2010.

Accrued Dividends and Distributions

The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock, preferred stock, and noncontrolling units as of December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Dividends and Distributions payable to:
Common stockholders	$	26,224	$	20,587
Noncontrolling common unitholders of the Operating Partnership	639		601
RSU holders (1)	367		295
Total accrued dividends and distribution to common stockholders and noncontrolling unitholders	27,230		21,483
Preferred stockholders	1,694		1,209
Total accrued dividends and distributions	$	28,924	$	22,692

______________________

(1) The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12).

	December 31,
	2012	2011
Outstanding Shares and Units:
Common stock (1)	74,926,981	58,819,717
Noncontrolling common units	1,826,503	1,718,131
RSUs (2)	1,048,863	842,675
Series E Preferred stock		1,610,000
Series F Preferred stock		3,450,000
Series G Preferred stock	4,000,000
Series H Preferred stock	4,000,000

______________________

(1) The amount includes nonvested shares.

(2) The amount includes nonvested RSUs.

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Basis of Presentation and Significant Accounting Policies (Details) (USD $)	3 Months Ended		12 Months Ended									12 Months Ended		12 Months Ended		12 Months Ended			12 Months Ended													12 Months Ended					12 Months Ended
	Dec. 31, 2012 VIEtransactions VIE building		Dec. 31, 2012 NumberofTradingDays segment VIE building		Dec. 31, 2011 segment VIE		Dec. 31, 2010	Dec. 31, 2012 Undeveloped Land [Member]	Dec. 31, 2011 Series A Cummulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series A Cummulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2010 Series A Cummulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Series E Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series E Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Series F Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series F Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series G Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Mar. 31, 2012 Series G Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Series G Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Series H Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Aug. 31, 2012 Series H Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Series H Cumulative Redeemable Preferred Unit [Member] Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Largest Tenants [Member] NumberofTenants	Dec. 31, 2012 Secured Debt [Member]	Dec. 31, 2011 Secured Debt [Member]	Dec. 31, 2012 Unsecured Debt [Member]	Dec. 31, 2011 Unsecured Debt [Member]	Dec. 31, 2012 Office Properties Acquisitions [Member] Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] building	Dec. 31, 2012 Development and Redevelopment Project Acquisitions [Member] project	Dec. 31, 2012 Development and Redevelopment Project Acquisitions [Member] Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] property	Dec. 31, 2012 Real Estate Investment [Member]	Dec. 31, 2011 Real Estate Investment [Member]	Dec. 31, 2012 Minimum [Member] Building and Building Improvements [Member]	Dec. 31, 2012 Minimum [Member] Tenant Improvements [Member]	Dec. 31, 2012 Maximum [Member] Building and Building Improvements [Member]	Dec. 31, 2012 Maximum [Member] Tenant Improvements [Member]	Dec. 31, 2011 Assets Held-for-sale [Member] building	Dec. 31, 2012 Lease Agreements [Member] Minimum [Member]	Dec. 31, 2012 Lease Agreements [Member] Maximum [Member]
Basis of presentation and significant accounting policies [Line Items]
Business Acquisition, Acquisition Related Costs Capitalized								$ 700,000
Number of consolidated variable interest entities	2		2		1
Number of days to complete Section 1031 Exchange			180
VIE Asset Amount	337,000,000		337,000,000		108,500,000																									319,770,000	101,352,000
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	111,100,000		111,100,000		7,300,000
Secured debt	221,032,000	[1]	221,032,000	[1]	30,997,000	[2]
Number of buildings																											1	7	1							2
Number of acquisition transactions	2
Depreciation and amortization of buildings and improvements			125,900,000		106,000,000		86,300,000
Property, Plant and Equipment, Useful Life																																25 years	1 year	40 years	20 years
Finite-Lived Intangible Asset, Useful Life																																						20 years
Leases, Estimated Useful Lives																																					1 year
Amortization of Financing Costs			16,600,000		16,800,000
Unamortized discount (premium), Net																							(7,200,000)	(800,000)	2,100,000	2,400,000
Preferred stock issued (in shares)										1,510,000	1,510,000
Preferred Units, Issued												1,610,000		3,450,000		4,000,000	4,000,000		4,000,000	4,000,000
Preferred stock (in shares)									1,510,000		1,510,000
Preferred units outstanding												1,610,000		3,450,000		4,000,000			4,000,000
Preferred stock, dividend rate									7.45%			7.80%		7.50%		6.875%			6.375%
Percentage of General partnership interest owned by wholly-owned subsidiary of the Company	1.00%		1.00%
REIT annual taxable income distribution requirement percentage			90.00%		90.00%
Company annual taxable income distribution			100.00%
Income tax liability relating to taxable REIT subisidiary			$ 60,000,000		$ 30,000,000		$ 30,000,000
Concentration Risk, Geographic			All of our properties and all of our business is currently conducted in the state of California with the exception of the ownership and operation of ten office properties located in the state of Washington. The ability of the tenants to honor the terms of their leases is dependent upon the economic, regulatory, and social factors affecting the communities in which the tenants operate.
Concentration Risk, Customer			As of December 31, 2012, our 15 largest tenants represented approximately 34.1% of total annualized base rental revenues.
Number Of Properties Of Company In Another State	10		10
Number Of Tenants																						15,000
Concentration Risk of Significant Tenants, Percentage			34.10%
Concentration Risk, Credit Risk, Uninsured Deposits			We have deposited cash with financial institutions that is insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 per institution. As of December 31, 2012 and 2011, we had cash accounts in excess of FDIC insured limits.
Number of Reportable Segments			1		1
Number of Non-Reportable Segments					1

[1] Represents the fair value of the mortgage loans assumed, which includes an aggregate unamortized premium balance of approximately $8.9 million at the dates of acquisition (see Note 7).

[2] Reflects the purchase price net of assumed secured debt and other lease-related obligations.

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Quarterly Financial Information of the Company (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Operating revenues	$ 111,111	[1]	$ 104,293	[1]	$ 97,111	[1]	$ 92,397	[1]	$ 94,226	[1]	$ 86,398	[1]	$ 81,002	[1]	$ 76,003	[1]	$ 404,912	$ 337,629	$ 254,994
Net Operating Income from continuing operations	79,276	[1],[2]	72,251	[1],[2]	68,437	[1],[2]	67,791	[1],[2]	67,777	[1],[2]	60,268	[1],[2]	56,910	[1],[2]	53,660	[1],[2]
Income (loss) from continuing operations	3,911	[1]	(665)	[1]	36	[1]	2,165	[1]	(16)	[1]	(3,391)	[1]	(1,071)	[1]	750	[1]	5,447	(3,728)	(427)
Income from discontinued operations	189,720	[1]	3,187	[1]	2,241	[1]	76,506	[1]	44,876	[1]	17,681	[1]	4,543	[1]	4,117	[1]	271,654	71,217	20,313
Net income	193,631		2,522		2,277		78,671		44,860		14,290		3,472		4,867		277,101	67,489	19,886
Net income attributable to Kilroy Realty Corporation	189,152		2,589		2,297		76,876		43,706		13,994		3,482		4,833		270,914	66,015	19,708
Preferred dividends and distributions	(3,313)		(5,342)		(3,097)		(9,336)		(3,799)		(3,799)		(3,799)		(3,799)		(21,088)	(15,196)	(15,196)
Net income (loss) available to common stockholders	$ 185,839	[3]	$ (2,753)	[3]	$ (800)	[3]	$ 67,540	[3]	$ 39,907	[3]	$ 10,195	[3]	$ (317)	[3]	$ 1,034	[3]	$ 249,826	$ 50,819	$ 4,512
Net income (loss) available to common stockholders per share—basic	$ 2.49	[3]	$ (0.04)	[3]	$ (0.02)	[3]	$ 1.06	[3]	$ 0.68	[3]	$ 0.17	[3]	$ (0.01)	[3]	$ 0.01	[3]	$ 3.56	$ 0.87	$ 0.07
Net income (loss) available to common stockholders per share—diluted	$ 2.45	[3]	$ (0.04)	[3]	$ (0.02)	[3]	$ 1.06	[3]	$ 0.68	[3]	$ 0.17	[3]	$ (0.01)	[3]	$ 0.01	[3]	$ 3.56	$ 0.87	$ 0.07

[1] All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

[2] Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

[3] The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding. The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 277,101	$ 67,489	$ 19,886
Adjustments to reconcile net income to net cash provided by operating activities (including discontinued operations):
Depreciation and amortization of building and improvements and leasing costs	168,687	135,467	102,898
(Decrease) increase in provision for bad debts	(42)	644	(1,063)
Depreciation of furniture, fixtures and equipment	1,213	1,130	911
Noncash amortization of share-based compensation awards (Note 12)	7,670	4,482	6,031
Noncash amortization of deferred financing costs and net debt discounts	8,433	13,540	12,490
Noncash amortization of net (below)/above market rents (Note 4)	(6,699)	1,056	1,377
Net gain on dispositions of discontinued operations (Note 17)	(259,245)	(51,587)	(949)
Noncash amortization of deferred revenue related to tenant-funded tenant improvements (Note 8)	(9,136)	(9,349)	(9,689)
Straight-line rents	(21,530)	(21,331)	(13,616)
Loss on early extinguishment of debt (Note 7)	0	0	4,564
Net change in operating assets	(1,297)	(5,434)	(9,065)
Net change in operating liabilities	17,320	2,779	5,509
Insurance proceeds received for property damage and other, net	(1,751)	(630)	543
Net cash provided by operating activities	180,724	138,256	119,827
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisition of operating properties (Note 3)	(454,841)	(603,301)	(637,620)
Expenditures for acquisitions of development and redevelopment properties (Note 3)	(333,942)	0	0
Expenditures for operating properties	(86,377)	(62,739)	(71,099)
Expenditures for development and redevelopment properties and undeveloped land	(83,310)	(28,517)	(21,832)
Net proceeds received from dispositions of operating properties (Note 17)	263,572	64,171	14,978
Insurance proceeds received for property damage	1,751	0	0
Decrease (increase) in acquisition-related deposits	5,000	(5,000)	0
(Increase) decrease in restricted cash (Note 3)	(18,359)	1,103	3,120
Receipt of principal payments on note receivable	0	0	10,679
Net cash used in investing activities	(706,506)	(634,283)	(701,774)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of Series G and Series H preferred stock (Note 10)	192,411	0	0
Payments for Repurchase of Redeemable Preferred Stock			0
Net proceeds from issuance of common stock (Note 10)	672,102	233,312	299,847
Borrowings on unsecured line of credit	704,000	550,000	660,000
Repayments on unsecured line of credit	(701,000)	(527,000)	(598,000)
Proceeds from issuance of secured debt (Note 7)	97,000	135,000	71,000
Principal payments on secured debt	(106,262)	(127,665)	(103,247)
Proceeds from the issuance of unsecured senior notes (Note 7)	150,000	324,476	572,672
Repayments of unsecured debt (Note 7)	0	0	(61,000)
Repurchase of exchangeable senior notes (Note 7)	0	0	(151,097)
Repayments of exchangeable senior notes (Note 7)	(148,000)	0	0
Financing costs	(7,963)	(9,060)	(14,912)
Decrease (increase) in loan deposits and other	0	2,859	(605)
Repurchase/redemption of common stock and restricted stock units	(1,661)	(1,152)	(3,417)
Proceeds from exercise of stock options	129	395	83
Dividends and distributions paid to common stockholders and common unitholders	(97,386)	(80,005)	(69,224)
Dividends and distributions paid to preferred stockholders and preferred unitholders	(14,165)	(15,196)	(15,196)
Net cash provided by financing activities	537,705	485,964	586,904
Net increase (decrease) in cash and cash equivalents	11,923	(10,063)	4,957
Cash and cash equivalents, beginning of period	4,777	14,840	9,883
Cash and cash equivalents, end of period	16,700	4,777	14,840
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $17,657, $7,615, and $7,697 as of December 31, 2012, 2011 and 2010, respectively	71,633	68,280	45,986
NONCASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	54,198	14,301	19,563
Tenant improvements funded directly by tenants to third parties	17,719	3,288	4,758
Assumption of secured debt with property acquisition (Notes 3 and 7)	221,032	30,042	51,079
Assumption of other assets and liabilities in connection with operating and development property acquisitions, net (Note 3)	37,535	4,515	10,840
NONCASH FINANCING TRANSACTIONS:
Accrual of dividends and distributions payable to common stockholders and common unitholders (Note 10)	26,863	21,188	18,925
Accrual of dividends and distributions payable to preferred stockholders and preferred unitholders (Note 10)	1,694	1,909	1,909
Issuance of share-based compensation awards (Note 12)	31,396	7,797	5,910
Issuance of common units in the Operating Partnership in connection with an operating property acquisition (Note 3)	5,604	0	0
Exchange of common units of the Operating Partnership into shares of the Company’s common stock (Note 10)	$ 231	$ 91	$ 0

XML

Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified					12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2012 Series A Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series A Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series H Cumulative Redeemable Preferred Stock [Member]
VIE Asset Amount	$ 337,000		$ 108,500
Common stock, par value	$ 0.01		$ 0.01
Common stock, shares authorized	150,000,000		150,000,000
Common stock, shares issued	74,926,981		58,819,717
Common stock, shares outstanding	74,926,981	[1]	58,819,717	[1]
Preferred stock, shares authorized	30,000,000		30,000,000			1,500,000		1,610,000		3,450,000	4,600,000		4,000,000
Preferred stock, par value	$ 0.01		$ 0.01			$ 0.01		$ 0.01		$ 0.01	$ 0.01		$ 0.01
Preferred stock, shares issued						0		1,610,000		3,450,000	4,000,000		4,000,000
Preferred stock, shares outstanding						0		1,610,000		3,450,000	4,000,000		4,000,000
Preferred stock dividend rate percentage						7.45%		7.80%		7.50%	6.875%		6.375%
Preferred stock liquidation preference								$ 40,250		$ 86,250	$ 100,000		$ 100,000

[1] The amount includes nonvested shares.

XML

Acquisitions

12 Months Ended

Dec. 31, 2012

Business Combinations [Abstract]

Acquisitions

Acquisitions

Operating Properties

During the years ended December 31, 2012 and 2011, we acquired the 24 operating office properties listed below from unrelated third parties. Unless otherwise noted, we funded these acquisitions with proceeds from the Company's public offerings of common stock (see Note 10), borrowings under the unsecured line of credit (see Note 7), disposition proceeds (see Note 17), the assumption of existing debt and the issuance of common units of the Operating Partnership.

Property	Acquisition	Number of Buildings	Rentable Square Feet (unaudited)	Occupancy as of December 31, 2012 (unaudited)	Purchase Price (in millions) (1)
2012 Acquisitions
4100-4700 Bohannon Drive, Menlo Park, CA	February 29, 2012	7	374,139	84.7%	$	162.5
701 and 801 N. 34th Street, Seattle, WA (3)	June 1, 2012	2	308,407	99.4%	105.4
837 N. 34th Street, Seattle, WA	June 1, 2012	1	111,580	100.0%	39.2
10900 NE 4th Street, Bellevue, WA (2)(4)	July 24, 2012	1	416,755	90.5%	186.1
6255 W. Sunset Boulevard, Los Angeles, CA (5)	July 31, 2012	1	321,883	85.2%	78.8
12233 Olympic Blvd, Los Angeles, CA (6)	October 5, 2012	1	151,029	96.8%	72.9
599 N. Mathilda Avenue, Sunnyvale, CA (2)(7)	December 17, 2012	1	75,810	100.0%	29.1
Total		14	1,759,603		$	674.0
2011 Acquisitions
250 Brannan Street, San Francisco, CA	January 28, 2011	1	92,948	100.0%	$	33.0
10210, 10220, and 10230 NE Points Drive; 3933 Lake Washington Boulevard NE, Kirkland, WA (8)	April 21, 2011	4	279,924	90.0%	100.1
10770 Wateridge Circle, San Diego, CA	May 12, 2011	1	174,310	97.5%	32.7
601 108th Avenue N.E., Bellevue, WA	June 3, 2011	1	488,470	90.4%	215.0
4040 Civic Center Drive, San Rafael, CA	June 9, 2011	1	126,787	98.1%	32.2
201 Third Street, San Francisco, CA	September 15, 2011	1	332,076	99.5%	103.3
301 Brannan Street, San Francisco, CA	November 15, 2011	1	74,430	100.0%	30.0
Total		10	1,568,945		$	546.3

________________________

(1) Excludes acquisition-related costs and non-lease related accrued liabilities assumed. Includes assumed unpaid leasing commissions and tenant improvements.

(2) As of December 31, 2012, these properties were temporarily being held in separate VIEs to facilitate potential Section 1031 Exchanges (see Note 2). The VIE was terminated subsequent to year-end.

(3) We acquired these properties through the acquisition of the ownership interest of the bankruptcy remote LLC that owned the properties. In connection with this acquisition we also acquired cash of approximately $4.0 million and other assets of approximately $0.2 million and we assumed current liabilities of approximately $0.6 million and secured debt with an outstanding principal balance of $34.0 million and a premium of $1.7 million as a result of recording the debt at fair value at the acquisition date (see Note 7).

(4) In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $83.6 million and a premium of $1.4 million as a result of recording

this debt at fair value on the acquisition date. In January 2013, we repaid this loan prior to the stated maturity (see Note 7).

(5) As part of the consideration for this transaction, we issued 118,372 common units of the Operating Partnership valued at $47.34 per unit, which was the Company's closing

stock price on the NYSE on the acquisition date. In connection with this acquisition we also assumed secured debt with an outstanding principal balance of $53.9 million and a

premium of $3.1 million as a result of recording this debt at fair value on the acquisition date (see Note 7). We also assumed $4.7 million of accrued liabilities in connection

with this acquisition that are not included in the purchase price above.

(6) In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $40.7 million and a premium of $2.7 million as a result of recording this debt at fair value on the acquisition date (see Note 7).

(7) This operating property was acquired in connection with the purchase of the 555 N. Mathilda Ave. development property discussed in further detail in the "Development and Redevelopment Project Site" section of this footnote, for a total purchase price of $137.6 million. The acquisition of both the operating property and the development site in a single transaction constituted our third largest acquisition of 2012.

(8) In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $30.0 million and an initial premium of $1.0 million as a result of recording this debt at fair value on the acquisition date (see Note 7).

The related assets, liabilities, and results of operations of the acquired properties are included in the consolidated financial statements as of the date of acquisition. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the respective acquisition dates for our 2012 and 2011 acquisitions:

2012 Acquisitions
	4100-4700 Bohannon Drive, Menlo Park, CA		10900 NE 4th Street, Bellevue, WA		599 N. Mathilda, Sunnyvale, CA		All Other Acquisitions (1)		Total
	(in thousands)
Assets
Land and improvements(2)	$	38,810	$	25,080	$	13,538	$	40,211	$	117,639
Buildings and improvements (3)	124,617		150,877		12,558		257,458		545,510
Cash and cash equivalents	—		—		—		3,973		3,973
Restricted cash	—		—		—		5,329		5,329
Deferred leasing costs and acquisition-related intangible assets (4)	9,470		16,469		3,004		30,570		59,513
Prepaid expenses and other assets	—		—		—		184		184
Total assets acquired	172,897		192,426		29,100		337,725		732,148
Liabilities
Deferred revenue and acquisition-related intangible liabilities (5)	10,380		4,940		—		19,700		35,020
Secured debt, net (6)	—		84,984		—		136,048		221,032
Accounts payable, accrued expenses and other liabilities	137		627		—		5,584		6,348
Total liabilities assumed	10,517		90,551		—		161,332		262,400
Net assets and liabilities acquired (7)	$	162,380	$	101,875	$	29,100	$	176,393	$	469,748

2011 Acquisitions
	601 108th Avenue N.E., Bellevue, WA		201 Third Street San Francisco, CA		All Other Acquisitions (1)		Total
	(in thousands)
Assets
Land and improvements (2)	$	—	$	19,260	$	42,650	$	61,910
Buildings and improvements (3)	214,095		84,018		165,995		464,108
Undeveloped land and construction in progress	—		—		2,560		2,560
Deferred leasing costs and acquisition-related intangible assets(8)	13,790		8,700		20,140		42,630
Total assets acquired	227,885		111,978		231,345		571,208
Liabilities
Deferred revenue and acquisition-related intangible liabilities(9)	12,850		8,700		2,390		23,940
Secured debt, net (10)	—		—		30,997		30,997
Accounts payable, accrued expenses, and other liabilities	2,380		76		2,059		4,515
Total liabilities assumed	15,230		8,776		35,446		59,452
Net assets and liabilities acquired (11)	$	212,655	$	103,202	$	195,899	$	511,756

________________________

(1) The purchase price of all other acquisitions during the years ended December 31, 2012 and 2011 were individually less than 5% and in aggregate less than 10% of the Company's total assets as of December 31, 2012 and 2011, respectively.

(2) In connection with the acquisitions of 701, 801, and 837 N. 34th Street, Seattle, WA, we assumed the lessee obligations under a ground lease with an initial expiration in December 2041. The ground lease obligation contains three10-year extension options and one45-year extension option. In connection with the acquisitions of 601 108th Avenue N.E., Bellevue, WA, we assumed the lessee obligation under a ground lease that is scheduled to expire in November 2093 (see Note 15 for additional information pertaining to these ground leases).

(3) Represents buildings, building improvements, and tenant improvements.

(4) Represents in-place leases (approximately $43.4 million with a weighted average amortization period of 4.7 years), above-market leases (approximately $1.4 million with a weighted average amortization period of 3.8 years), leasing commissions (approximately $14.2 million with a weighted average amortization period of 3.4 years), and a below-market ground lease obligation (approximately $0.5 million with a weighted average amortization period of 59.6 years).

(5) Represents below-market leases (approximately $33.9 million with a weighted average amortization period of 6.5 years) and an above-market ground lease obligation (approximately $1.1 million with a weighted average amortization period of 29.6 years).

(6) Represents the fair value of the mortgage loans assumed, which includes an aggregate unamortized premium balance of approximately $8.9 million at the dates of acquisition (see Note 7).

(7) Reflects the purchase price plus cash and restricted cash received, net of assumed secured debt, lease-related obligations and other accrued liabilities.

(8) Represents in-place leases (approximately $27.4 million with a weighted average amortization period of 3.8 years), above-market leases (approximately $6.8 million with a weighted average amortization period of 4.5 years years) and unamortized leasing commissions (approximately $8.5 million with a weighted average amortization period of 2.5 years).

(9) Represents below-market leases (approximately $18.7 million with a weighted average amortization period of 3.9 years) and an above-market ground lease obligation (approximately $5.2 million with a weighted average amortization period of 82.5 years), under which we are the lessee.

(10) Represents the mortgage loan, which includes an unamortized premium of approximately $1.0 million at the date of acquisition, assumed in connection with the properties acquired in April 2011 (see Note 7).

(11) Reflects the purchase price net of assumed secured debt and other lease-related obligations.

Development and Redevelopment Project Sites

During the years ended December 31, 2012 and 2011, we acquired seven development and redevelopment project sites from unrelated third parties. Unless otherwise noted, we funded these acquisitions with proceeds from the Company's public offering of common stock (see Note 10), disposition proceeds (see Note 17) and borrowings under the unsecured line of credit (see Note 7).

Project	Date of Acquisition	Type	Purchase Price (in millions) (1)
2012 Acquisitions
690 E. Middlefield Road, Mountain View, CA (2)(3)	May 9, 2012	Development	$	74.5
333 Brannan Street, San Francisco, CA	July 20, 2012	Development	18.5
Columbia Square, Los Angeles, CA (4)	September 28, 2012	Development and Redevelopment	65.0
350 Mission Street, San Francisco, CA	October 23, 2012	Development	52.0
331 Fairchild Drive, Mountain View, CA (2)(5)	December 4, 2012	Development	21.8
555 N. Mathilda Avenue, Sunnyvale, CA (2)(6)(7)	December 17, 2012	Development	108.5
Total			$	340.3
2011 Acquisitions
360 Third Street, San Francisco, CA	December 15, 2011	Redevelopment	$	91.5
Total			$	91.5

________________________

(1) Excludes leasing costs and/or other accrued liabilities assumed in connection with the acquisitions.

(2) Acquisition of these development sites are accounted for as business combinations because the projects were 100% pre-leased upon acquisition.

(3) The total purchase price for this acquisition was comprised of a cash purchase price of $74.5 million plus $9.5 million of assumed leasing commissions and other accrued liabilities.

(4) In connection with this acquisition we also assumed $1.1 million of other accrued liabilities which are not included in the purchase price above.

(5) The total purchase price for this acquisition was comprised of a cash purchase price of $18.9 million plus $2.9 million of development costs reimbursed to the seller. In addition, we assumed $2.1 million of leasing commissions and other accrued liabilities which are not included in the purchase price above.

(6) As of December 31, 2012, this property was temporarily being held in a separate VIE to facilitate a potential Section 1031 Exchange (see Note 2). The VIE was terminated subsequent to year-end.

(7) This development site was acquired with the purchase of the 555 Mathilda operating property for a total cash purchase price of $137.6 million plus $2.4 million of development costs reimbursed to the seller. In addition, we assumed $11.8 million of other accrued liabilities which are not included in the purchase price above.

The related assets and liabilities of the acquired projects are included in the consolidated financial statements as of the date of acquisition. The following table summarizes the estimated fair values of the assets acquired and liabilities assumed at the respective acquisition dates for our 2012 and 2011 development and redevelopment acquisitions:

2012 Acquisitions
	555 N. Mathilda, Sunnyvale, CA		All Other Acquisitions		Total
	(in thousands)
Assets
Undeveloped land and construction in progress	$	120,243	$	244,584	$	364,827
Restricted cash (1)	11,250		—		11,250
Prepaid expenses and other assets	—		1,300		1,300
Total assets acquired	131,493		245,884		377,377
Liabilities
Accounts payable, accrued expenses and other liabilities (1)	23,071		9,752		32,823
Total liabilities assumed	23,071		9,752		32,823
Net assets and liabilities acquired (2)	$	108,422	$	236,132	$	344,554

2011 Acquisition
	360 Third Street, San Francisco, CA
	(in thousands)
Assets
Undeveloped land and construction in progress (3)	$	89,345
Deferred leasing costs and acquisition-related intangible assets	2,930
Total assets acquired	92,275
Liabilities
Deferred revenue and acquisition-related intangible liabilities	730
Total liabilities assumed	730
Net assets and liabilities acquired	$	91,545

________________________

(1) In connection with this acquisition, restricted cash is being held in escrow to pay for potential environmental costs and contingent development costs. Any unused amounts will be released to the seller.

(2) Reflects the purchase price including assumed leasing commissions, net of assumed accrued liabilities.

(3) In connection with this acquisition we assumed the lessee obligation under a ground lease that is scheduled to expire in December 2022. We exercised the $27.5 million land purchase option, which was not included in the purchase price, during 2012 and anticipate we will close on the purchase of the land during the second quarter of 2013 (see Note 15 for additional information pertaining to this ground lease).

XML

Segment Disclosure (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Real Estate Acquisitions [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	$ 1,087,489	[1]	$ 663,483	[1]
Real Estate Acquisitions [Member] | Reportable Segment - Office Properties [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	1,087,489	[1]	663,483	[1]
Development and Redevelopment Properties and Undeveloped Land [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	144,477	[1]	32,198	[1]
Development and Redevelopment Properties and Undeveloped Land [Member] | Reportable Segment - Office Properties [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	144,477	[1]	32,198	[1]
Stabilized Portfolio [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	87,220	[1],[2]	72,449	[1],[2]
Stabilized Portfolio [Member] | Reportable Segment - Office Properties [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	86,089	[1],[2]	66,448	[1],[2]
Stabilized Portfolio [Member] | Non-Reportable Segment - Industrial Properties [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information, Expenditures for Additions to Long-Lived Assets	$ 1,131	[1],[2]	$ 6,001	[1],[2]

[1] Total consolidated acquisitions and capital expenditures are equal to the same amounts disclosed for total segments. Amounts represent balances on an accrual basis.

[2] Includes expenditures for building improvements, tenant improvements, deferred leasing costs and acquisition-related intangible assets for our operating properties. Excludes acquisition-related intangible liabilities.

XML

Share-Based Compensation Share-Based Compensation (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding, Number of Options, Beginning of Year	5,000
Granted (in shares)	1,550,000
Exercised (in shares)	(5,000)
Forfeited (in shares)	(10,000)
Outstanding, Number of Options, End of Year	1,540,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, Exercise Price, Beginning of Year (in dollars per share)	$ 25.77
Granted, Exercise Price (in dollars per share)	$ 42.61
Exercised, Exercise Price (in dollars per share)	$ 25.77
Forfeited, Exercise Price (in dollars per share)	$ 42.61
Outstanding, Exercise Price, End of Year (in dollars per share)	$ 42.61
Remaining Contractual Term	9 years 2 months 12 days
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of options granted per share	$ 9.20
Expected share price volatility	33.00%
Risk-free interest rate	1.35%
Dividend yield	3.80%
Expected life	6 years 6 months

XML

Share-Based Compensation (Details 1) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year (in shares)	83,966
Outstanding at beginning of year, Weighted Average Grant Date Fair Value (in dollars per share)	$ 39.83
Granted (in shares)	62,137		68,727	3,239
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	$ 41.84		$ 37.83	$ 30.88
Vested (in shares)	(50,862)		(34,793)	(41,680)
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 41.29
Cancelled (in shares)	(18,766)
Outstanding at end of year (in shares)	95,241		83,966
Outstanding at end of year, Weighted Average Grant Date Fair Value (in dollars per share)	$ 40.42		$ 39.83
Nonvested Restricted Stock Units RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year (in shares)	147,961
Outstanding at beginning of year, Weighted Average Grant Date Fair Value (in dollars per share)	$ 32.18
Granted (in shares)	204,829		107,673	159,606
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	$ 44.34		$ 37.94	$ 30.24
Vested (in shares)	(73,688)		(85,466)	(303,146)
Vested, Weighted Average Grant Date Fair Value (in dollars per share)	$ 38.91
Outstanding at end of year (in shares)	279,102		147,961
Outstanding at end of year, Weighted Average Grant Date Fair Value (in dollars per share)	$ 41.30		$ 32.18
Vested Restricted Stock Units R S U [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year, Vested RSUs and Total RSUs (in shares)	694,714
Granted (in shares)	0
Vested (in shares)	(73,688)
Settled (in shares)	(19,955)
Issuance of dividend equivalents (in shares)	28,368
Cancelled (in shares)	(7,054)
Outstanding at end of year, Vested RSUs and Total RSUs (in shares)	769,761
Time-Based Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Outstanding at beginning of year, Vested RSUs and Total RSUs (in shares)	842,675	[1]
Granted (in shares)	204,829
Vested (in shares)	0
Settled (in shares)	(19,955)
Issuance of dividend equivalents (in shares)	28,368
Cancelled (in shares)	(7,054)
Outstanding at end of year, Vested RSUs and Total RSUs (in shares)	1,048,863	[1]
Chief Executive Officer [Member] | Nonvested Restricted Stock Units RSU [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	103,239

[1] The amount includes nonvested RSUs.

XML

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2012	Feb. 11, 2013	Jun. 30, 2012
Entity Information [Line Items]
Entity Registrant Name	KILROY REALTY CORP
Entity Central Index Key	0001025996
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q4
Amendment Flag	false
Entity Common Stock, Shares Outstanding		74,895,990
Entity Public Float			$ 2,382,187,648
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Kilroy Realty, L.P. [Member]
Entity Information [Line Items]
Entity Registrant Name	Kilroy Realty, L.P.
Entity Central Index Key	0001493976
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2012
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q4
Amendment Flag	false
Entity Public Float			$ 12,415,519
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

XML

Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net

12 Months Ended

Dec. 31, 2012

Goodwill and Intangible Assets Disclosure [Abstract]

Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net

Deferred Leasing Costs and Acquisition-related Intangible Assets and Liabilities, net

The following table summarizes our deferred leasing costs and acquisition-related intangible assets (acquired value of leasing costs, above-market operating leases, in-place leases and below-market ground lease obligation) and intangible liabilities (acquired value of below-market operating leases and above-market ground lease obligation) as of December 31, 2012 and 2011:

	December 31,
	2012			2011
	(in thousands)
Deferred Leasing Costs and Acquisition-related Intangible Assets, net:
Deferred leasing costs	$	168,087		$	142,652
Accumulated amortization	(61,443		)	(52,974		)
Deferred leasing costs, net	106,644			89,678
Above-market operating leases	27,977			28,143
Accumulated amortization	(12,180		)	(8,101		)
Above-market operating leases, net	15,797			20,042
In-place leases	101,061			61,355
Accumulated amortization	(34,019		)	(15,753		)
In-place leases, net	67,042			45,602
Below-market ground lease obligation	690			200
Accumulated amortization	(205		)	—
Below-market ground lease obligation, net	485			200
Total deferred leasing costs and acquisition-related intangible assets, net	$	189,968		$	155,522
Acquisition-related Intangible Liabilities, net(1):
Below-market operating leases	$	70,486		$	37,582
Accumulated amortization	(17,555		)	(6,158		)
Below-market operating leases, net	52,931			31,424
Above-market ground lease obligation	6,320			5,200
Accumulated amortization	(122		)	(37		)
Above-market ground lease obligation, net	6,198			5,163
Total acquisition-related intangible liabilities, net	$	59,129		$	36,587

________________________

(1) Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets.

The following table sets forth amortization related to deferred leasing costs and acquisition-related intangibles for the years ended December 31, 2012, 2011 and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands)
Deferred leasing costs (1)	$	20,804		$	16,905		$	13,344
Above-market operating leases (2)	5,695			5,946			2,163
In-place leases (1)	21,976			12,575			3,266
Below-market ground lease obligation (3)	205			—			—
Below-market operating leases (4)	(12,393		)	(4,890		)	(786		)
Above-market ground lease obligation (5)	(85		)	(37		)	—
Total	$	36,202		$	30,499		$	17,987

_________________________

(1) The amortization of deferred leasing costs and in-place leases is recorded to depreciation and amortization expense in the consolidated statements of operations for the periods

presented.

(2) The amortization of above-market operating leases is recorded as a decrease to rental income in the consolidated statements of operations for the periods presented.

(3) The amortization of the below-market ground lease obligation is recorded as an increase to ground lease expense in the consolidated statements of operations for the periods presented.

(4) The amortization of below−market operating leases is recorded as an increase to rental income in the consolidated statements of operations for the periods presented.

(5) The amortization of the above-market ground lease obligation is recorded as a decrease to ground lease expense in the consolidated statements of operations for the periods presented.

The following table sets forth the estimated annual amortization expense related to deferred leasing costs and acquisition-related intangibles as of December 31, 2012 for future periods:

Year Ending	Deferred Leasing Costs		Above-Market Operating Leases (1)		In-Place Leases		Below-Market Ground Lease Obligation (2)		Below-Market Operating Leases (3)			Above-Market Ground Lease Obligation (4)
	(in thousands)
2013	$	22,676	$	5,316	$	23,298	$	8	$	(13,140	)	$	(101	)
2014	20,235		4,336		15,567		8		(11,360		)	(101		)
2015	16,377		2,533		9,913		8		(8,828		)	(101		)
2016	13,757		1,506		6,798		8		(6,645		)	(101		)
2017	11,421		1,185		5,417		8		(5,577		)	(101		)
Thereafter	22,178		921		6,049		445		(7,381		)	(5,693		)
Total	$	106,644	$	15,797	$	67,042	$	485	$	(52,931	)	$	(6,198	)

_______________________

(1) Represents estimated annual amortization related to above-market operating leases. Amounts will be recorded as a decrease to rental income in the consolidated statements of operations.

(2) Represents estimated annual amortization related to below−market ground lease obligations. Amounts will be recorded as an increase to ground lease expense in the consolidated statements of operations.

(3) Represents estimated annual amortization related to below-market operating leases. Amounts will be recorded as an increase to rental income in the consolidated statements of operations.

(4) Represents estimated annual amortization related to above−market ground lease obligations. Amounts will be recorded as a decrease to ground lease expense in the consolidated statements of operations.

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Secured and Unsecured Debt of the Operating Partnership (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Capitalized interest and loan fees
Interest expense (Note 5)		$ 79,114		$ 85,785	$ 55,082
Kilroy Realty, L.P. [Member]
Capitalized interest and loan fees
Gross interest expense	69,661	98,906		94,915
Capitalized interest	(10,015)	(19,792)		(9,130)
Interest expense (Note 5)	59,646	79,114		85,785	55,082
Debt [Member] | Kilroy Realty, L.P. [Member]
Stated debt maturities and scheduled amortization payments, excluding debt discounts
2013		90,881
2014		263,913
2015		393,711
2016		247,822
2017		255,036
Thereafter		793,056
Total		$ 2,044,419	[1]

[1] Includes gross principal balance of outstanding debt before impact of all debt discounts and premiums.

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Share-Based Compensation (Details) (Market Measure-Based Restricted Stock Units (RSUs) [Member], USD $)	12 Months Ended
	Dec. 31, 2012
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value per share	$ 41.20
Expected share price volatility	31.00%
Risk-free interest rate	1.60%
Dividend yield	3.80%
Expected life	7 years

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Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUES:
Rental income	$ 369,516	$ 307,118	$ 235,304
Tenant reimbursements	32,309	23,977	17,996
Other property income	3,087	6,534	1,694
Total revenues	404,912	337,629	254,994
EXPENSES:
Property expenses	79,357	66,821	51,169
Real estate taxes	34,479	29,633	23,474
Provision for bad debts	153	781	65
Ground leases (Note 4 and 15)	3,168	1,779	984
General and administrative expenses	36,188	28,148	27,963
Acquisition-related expenses	4,937	4,053	2,248
Depreciation and amortization (Notes 2 and 4)	162,917	124,928	90,836
Total expenses	321,199	256,143	196,739
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (Note 16)	848	571	964
Interest expense (Note 7)	(79,114)	(85,785)	(55,082)
Loss on early extinguishment of debt (Note 7)	0	0	(4,564)
Total other (expenses) income	(78,266)	(85,214)	(58,682)
INCOME (LOSS) FROM CONTINUING OPERATIONS	5,447	(3,728)	(427)
DISCONTINUED OPERATIONS (Note 17)
Income from discontinued operations	12,409	19,630	19,364
Net gain on dispositions of discontinued operations	259,245	51,587	949
Total income from discontinued operations	271,654	71,217	20,313
NET INCOME	277,101	67,489	19,886
Net income attributable to noncontrolling common units of the Operating Partnership	(6,187)	(1,474)	(178)
NET INCOME ATTRIBUTABLE TO KILROY REALTY CORPORATION	270,914	66,015	19,708
PREFERRED DISTRIBUTIONS AND DIVIDENDS:
Distributions to noncontrolling cumulative redeemable preferred units of the Operating Partnership (Note 9)	(3,541)	(5,588)	(5,588)
Preferred dividends (Note 10)	(10,567)	(9,608)	(9,608)
Original issuance costs of redeemed preferred stock and preferred units (Notes 9 and 11)	6,980	0	0
Total preferred distributions	21,088	15,196	15,196
NET INCOME AVAILABLE TO COMMON STOCKHOLDERS	$ 249,826	$ 50,819	$ 4,512
Loss from continuing operations available to common stockholders per common share-basic (Note 19)	$ (0.24)	$ (0.35)	$ (0.33)
Loss from continuing operations available to common stockholders per common share-diluted (Note 19)	$ (0.24)	$ (0.35)	$ (0.33)
Net income available to common stockholders per share-basic (Note 19)	$ 3.56	$ 0.87	$ 0.07
Net income available to common stockholders per share-diluted (Note 19)	$ 3.56	$ 0.87	$ 0.07
Weighted average common shares outstanding-basic (Note 19)	69,639,623	56,717,121	49,497,487
Weighted average common shares outstanding-diluted (Note 19	69,639,623	56,717,121	49,497,487
Dividends declared per common share	$ 1.4	$ 1.4	$ 1.4

XML

Consolidated Statements of Capital (KILROY REALTY, L.P.) (Kilroy Realty, L.P. [Member], USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended									12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Total Partners Capital [Member]	Dec. 31, 2011 Total Partners Capital [Member]	Dec. 31, 2010 Total Partners Capital [Member]	Dec. 31, 2012 Partners Capital Preferred Units [Member]	Dec. 31, 2010 Partners Capital Preferred Units [Member]	Dec. 31, 2009 Partners Capital Preferred Units [Member]	Dec. 31, 2012 Partners Capital Common Unit [Member]	Dec. 31, 2011 Partners Capital Common Unit [Member]	Dec. 31, 2010 Partners Capital Common Unit [Member]	Dec. 31, 2012 Noncontrolling Interest In Consolidated Subsidiaries [Member]	Dec. 31, 2011 Noncontrolling Interest In Consolidated Subsidiaries [Member]	Dec. 31, 2010 Noncontrolling Interest In Consolidated Subsidiaries [Member]	Dec. 31, 2012 Series E and Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series E and Series F Cumulative Redeemable Preferred Stock [Member] Total Partners Capital [Member]	Dec. 31, 2012 Series E and Series F Cumulative Redeemable Preferred Stock [Member] Partners Capital Common Unit [Member]	Dec. 31, 2012 Series A Preferred Units [Member]	Dec. 31, 2012 Series A Preferred Units [Member] Total Partners Capital [Member]	Dec. 31, 2012 Series A Preferred Units [Member] Partners Capital Common Unit [Member]
Distributions Per Common Unit	$ 1.4	$ 1.4	$ 1.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance	$ 1,327,482	$ 1,117,730	$ 883,838	$ 1,324,841	$ 1,116,093	$ 882,338	$ 121,582	$ 121,582	$ 121,582	$ 1,203,259	$ 994,511	$ 760,756	$ 2,641	$ 1,637	$ 1,500
Beginning Balance units										60,537,848	54,072,801	44,871,893
Net income	277,101	67,489	19,886	276,463	66,960	19,724				276,463	66,960	19,724	638	529	162
Proceeds from issuance of preferred stock	192,411			192,411			192,411
Redemption of Series E and Series F Preferred units (Note 11), shares							121,582
Original issuance costs of redeemed preferred units (Notes 9 and 11)	(6,980)	0	0													(126,500)	(126,500)	(4,918)	(2,062)	(2,062)	(2,062)
Issuance of common units (Note 11)	672,102	233,312	299,847	672,102	233,312	299,847				672,102	233,312	299,847
Issuance of common units in connection with an operating property acquisition ( Notes 2 and 11)										118,372
Issuance of common units in the Operating Partnership in connection with an operating property acquisition (Note 3)	5,604	0	0	5,604						5,604
Issuance of common units, units (Note 11)										16,024,618	6,392,805
Issuance of share-based compensation awards (Note 12)	1,291	2,739	2,151	1,291	2,739	2,151				1,291	2,739	2,151
Issuance of share-based compensation awards, units (Note 12)										62,137	68,727	3,239
Noncash amortization of share-based compensation	8,537	5,588	6,687	8,537	5,588	6,687				8,537	5,588	6,687
Repurchase of common units and restricted stock units (Note 12)	(877)	(1,152)	(2,121)	(877)	(1,152)	(2,121)				(877)	(1,152)	(2,121)
Repurchase of common units and restricted stock units, units (Note 12)										(22,312)	(11,485)	(59,782)
Allocation to the equity component of cash paid upon repurchase of 3.25% Exchangeable Notes (Note 7)			(2,694)			(2,694)						(2,694)
Other		0	0		(475)	25					(475)	25		475	(25)
Preferred Stock Dividends, Income Statement Impact	14,108	15,196	15,196	14,108						14,108	15,196
Preferred dividends and distributions	(21,088)	(15,196)	(15,196)		(15,196)	(15,196)						(15,196)
Distributions declared per common unit ($1.40 per unit)	(104,393)	(83,423)	(73,455)	(104,393)	(83,423)	(73,455)				(104,393)	(83,423)	(73,455)
Settlement of restricted stock units for shares of common stock	(784)		(1,296)	(784)		(1,296)				(784)		(1,296)
Settlement of restricted stock units for shares of common stock units										27,821		53,451
Exercise of stock options	129	395	83	129	395	83				129	395	83
Exercise of stock options, units										5,000	15,000	4,000
Ending Balance	$ 2,235,933	$ 1,327,482	$ 1,117,730	$ 2,232,654	$ 1,324,841	$ 1,116,093	$ 192,411	$ 121,582	$ 121,582	$ 2,040,243	$ 1,203,259	$ 994,511	$ 3,279	$ 2,641	$ 1,637
Ending Balance units										76,753,484	60,537,848	54,072,801

XML

Consolidated Statements of Operations (KILROY REALTY, L.P.) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
REVENUES:
Rental income	$ 369,516	$ 307,118	$ 235,304
Tenant reimbursements	32,309	23,977	17,996
Other property income	3,087	6,534	1,694
Total revenues	404,912	337,629	254,994
EXPENSES:
Property expenses	79,357	66,821	51,169
Real estate taxes	34,479	29,633	23,474
Provision for bad debts	153	781	65
Ground leases (Note 4 and 15)	3,168	1,779	984
General and administrative expenses	36,188	28,148	27,963
Acquisition-related expenses	4,937	4,053	2,248
Depreciation and amortization (Notes 2 and 4)	162,917	124,928	90,836
Total expenses	321,199	256,143	196,739
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (Note 16)	848	571	964
Interest expense (Note 7)	(79,114)	(85,785)	(55,082)
Loss on early extinguishment of debt (Note 7)	0	0	(4,564)
Total other (expenses) income	(78,266)	(85,214)	(58,682)
INCOME (LOSS) FROM CONTINUING OPERATIONS	5,447	(3,728)	(427)
DISCONTINUED OPERATIONS (Note 17)
Income from discontinued operations	12,409	19,630	19,364
Net gain on dispositions of discontinued operations	259,245	51,587	949
Total income from discontinued operations	271,654	71,217	20,313
NET INCOME	277,101	67,489	19,886
NET INCOME ATTRIBUTABLE TO KILROY REALTY, L.P.	270,914	66,015	19,708
Preferred distributions (Note 11)	(14,108)	(15,196)
Original issuance costs of redeemed preferred units (Notes 9 and 11)	(6,980)	0	0
Total preferred distributions	21,088	15,196	15,196
NET INCOME AVAILABLE TO COMMON UNITHOLDERS	249,826	50,819	4,512
Loss from continuing operations available to common unitholders per unit-basic (Note 20)	$ (0.24)	$ (0.35)	$ (0.33)
Loss from continuing operations available to common unitholders per unit-diluted (Note 20)	$ (0.24)	$ (0.35)	$ (0.33)
Net income available to common unitholders per unit-basic (Note 20)	$ 3.56	$ 0.87	$ 0.07
Net income available to common unitholders per unit-diluted (Note 20)	$ 3.56	$ 0.87	$ 0.07
Weighted average common units outstanding - basic (Note 20)	69,639,623	56,717,121	49,497,487
Weighted average common units outstanding - diluted (Note 20)	69,639,623	56,717,121	49,497,487
Kilroy Realty, L.P. [Member]
REVENUES:
Rental income	369,516	307,118	235,304
Tenant reimbursements	32,309	23,977	17,996
Other property income	3,087	6,534	1,694
Total revenues	404,912	337,629	254,994
EXPENSES:
Property expenses	79,357	66,821	51,169
Real estate taxes	34,479	29,633	23,474
Provision for bad debts	153	781	65
Ground leases (Note 4 and 15)	3,168	1,779	984
General and administrative expenses	36,188	28,148	27,963
Acquisition-related expenses	4,937	4,053	2,248
Depreciation and amortization (Notes 2 and 4)	162,917	124,928	90,836
Total expenses	321,199	256,143	196,739
OTHER (EXPENSES) INCOME:
Interest income and other net investment gains (Note 16)	848	571	964
Interest expense (Note 7)	(79,114)	(85,785)	(55,082)
Loss on early extinguishment of debt (Note 7)	0	0	(4,564)
Total other (expenses) income	(78,266)	(85,214)	(58,682)
INCOME (LOSS) FROM CONTINUING OPERATIONS	5,447	(3,728)	(427)
DISCONTINUED OPERATIONS (Note 17)
Income from discontinued operations	12,409	19,630	19,364
Net gain on dispositions of discontinued operations	259,245	51,587	949
Total income from discontinued operations	271,654	71,217	20,313
NET INCOME	277,101	67,489	19,886
Net income attributable to noncontrolling interests in consolidated subsidiaries	(638)		(162)
NET INCOME ATTRIBUTABLE TO KILROY REALTY, L.P.	276,463	66,960	19,724
Preferred distributions (Note 11)	(14,108)	(15,196)	(15,196)
Original issuance costs of redeemed preferred units (Notes 9 and 11)	(6,980)	0	0
Total preferred distributions	21,088	15,196	15,196
NET INCOME AVAILABLE TO COMMON UNITHOLDERS	$ 255,375	$ 51,764	$ 4,528
Loss from continuing operations available to common unitholders per unit-basic (Note 20)	$ (0.24)	$ (0.36)	$ (0.33)
Loss from continuing operations available to common unitholders per unit-diluted (Note 20)	$ (0.24)	$ (0.36)	$ (0.33)
Net income available to common unitholders per unit-basic (Note 20)	$ 3.56	$ 0.86	$ 0.07
Net income available to common unitholders per unit-diluted (Note 20)	$ 3.56	$ 0.86	$ 0.07
Weighted average common units outstanding - basic (Note 20)	71,403,258	58,437,444	51,220,618
Weighted average common units outstanding - diluted (Note 20)	71,403,258	58,437,444	51,220,618
Distributions declared per common unit	$ 1.4	$ 1.4000	$ 1.4000

XML

Noncontrolling Interests on the Company's Consolidated Financial Statements

12 Months Ended

Dec. 31, 2012

Noncontrolling Interest [Abstract]

Noncontrolling Interests on the Company's Consolidated Financial Statements

Noncontrolling Interests on the Company's Consolidated Financial Statements

7.45% Series A Cumulative Redeemable Preferred Units of the Operating Partnership

On August 15, 2012 (the "Series A Redemption Date"), the Operating Partnership redeemed all 1,500,000 outstanding 7.45% Series A Cumulative Redeemable Preferred Units representing preferred limited partnership interests in the Operating Partnership ("Series A Preferred Units"). On the Series A Redemption Date, the Series A Preferred Units were redeemed at a redemption price equal to $50.00 per unit, representing $75.0 million in aggregate, plus all accrued and unpaid distributions to the Series A Redemption Date.

During the year ended December 31, 2012, we recognized a non-recurring non-cash charge of $2.1 million as a reduction to net income available to common stockholders for the original issuance costs related to the Series A Preferred Units.

As of December 31, 2011, all 1,500,000 Series A Preferred units were outstanding and the accrued distribution payable to holders of Series A Preferred Units, which was included in the Series A Preferred Units noncontrolling interest on the balance sheet, was $0.7 million.

Common Units of the Operating Partnership

The Company owned a 97.6% and 97.2% common general partnership interest in the Operating Partnership as of December 31, 2012 and 2011, respectively. The remaining 2.4% and 2.8% common limited partnership interest as of December 31, 2012 and 2011, respectively, was owned by non-affiliate investors and certain of our executive officers and directors in the form of noncontrolling common units. There were 1,826,503 and 1,718,131 common units outstanding held by these investors, executive officers and directors as of December 31, 2012 and 2011, respectively. The increase in the common units from December 31, 2011 to December 31, 2012 was primarily attributable to 118,372 units issued in connection with an operating property acquisition (see Note 3).

The noncontrolling common units may be redeemed by unitholders for cash. We, at our option, may satisfy the cash redemption obligation with shares of the Company’s common stock on a one-for-one basis. Whether satisfied in cash or shares of the Company’s common stock, the value for each noncontrolling common unit upon redemption is the amount equal to the average of the closing quoted price per share of the Company’s common stock, par value $.01 per share, as reported on the NYSE for the ten trading days immediately preceding the applicable balance sheet date. The aggregate value upon redemption of the then-outstanding noncontrolling common units was $85.4 million and $64.7 million as of December 31, 2012 and 2011, respectively. This redemption value does not necessarily represent the amount that would be distributed with respect to each noncontrolling common unit in the event of our termination or liquidation. In the event of our termination or liquidation, it is expected in most cases that each common unit would be entitled to a liquidating distribution equal to the amount payable with respect to each share of the Company’s common stock.

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Receivables

12 Months Ended

Dec. 31, 2012

Receivables [Abstract]

Receivables

Receivables

Current Receivables, net

Current receivables, net is primarily comprised of contractual rents and other lease-related obligations due from tenants. The balance consisted of the following as of December 31, 2012 and 2011:

	December 31,
	2012			2011
	(in thousands)
Current receivables	$	11,801		$	10,985
Allowance for uncollectible tenant receivables	(2,581		)	(2,590		)
Current receivables, net	$	9,220		$	8,395

Deferred Rent Receivables, net

Deferred rent receivables, net consisted of the following as of December 31, 2012 and 2011:

	December 31,
	2012			2011
	(in thousands)
Deferred rent receivables	$	118,025		$	104,548
Allowance for deferred rent receivables	(2,607		)	(3,406		)
Total deferred rent receivables, net	$	115,418		$	101,142

XML

Noncontrolling Interests on the Company's Consolidated Financial Statements (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 D	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Series A Cummulative Redeemable Preferred Unit [Member]	Aug. 15, 2012 Series A Cummulative Redeemable Preferred Unit [Member]
Temporary Equity [Line Items]
7.45% Series A cumulative redeemable preferred units of the Operating Partnership outstanding					1,500,000
Preferred units redemption value per unit					$ 50
Redemption value					$ 75,000,000
Preferred stock redemption premium	6,980,000	0	0	2,100,000
Accrued distribution payable	700,000
Noncontrolling Interest (Textuals) [Abstract]
Percentage of general partnership interest owned by the company in the Operating Partnership	97.60%	97.20%
Percentage of Common limited partnership interest owned by certain non-affiliated investors and certain directors and officers of the Company in the Operating Partnership	2.40%	2.80%
Noncontrolling common units	1,826,503	1,718,131
Issuance of common units in connection with an operating property acquisition	118,372
Common stock, par value	$ 0.01	$ 0.01
Number of trading days	10
Aggregate value upon redemption of outstanding noncontrolling common units	$ 85,400,000	$ 64,700,000

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Organization and Ownership

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Ownership

Organization and Ownership

Organization

Kilroy Realty Corporation (the "Company") is a self-administered real estate investment trust ("REIT") active in office submarkets along the West Coast. We own, develop, acquire and manage real estate assets, consisting primarily of Class A properties in the coastal regions of Los Angeles, Orange County, San Diego County, the San Francisco Bay Area and greater Seattle, which we believe have strategic advantages and strong barriers to entry. Class A real estate encompasses attractive and efficient buildings of high quality that are attractive to tenants, are well-designed and constructed with above-average material, workmanship and finishes and are well-maintained and managed. We qualify as a REIT under the Internal Revenue Code of 1986, as amended (the "Code"). The Company's common stock is publicly traded on the New York Stock Exchange ("NYSE") under the ticker symbol "KRC."

We own our interests in all of our real estate assets through Kilroy Realty, L.P. (the "Operating Partnership") and Kilroy Realty Finance Partnership, L.P. (the "Finance Partnership"). We conduct substantially all of our operations through the Operating Partnership. Unless stated otherwise or the context indicates otherwise, the terms "Kilroy Realty Corporation" or the "Company," "we," "our," and "us" refer to Kilroy Realty Corporation and its consolidated subsidiaries and the term "Operating Partnership" refers to Kilroy Realty, L.P. and its consolidated subsidiaries. The descriptions of our business, employees, and properties apply to both the Company and the Operating Partnership.

Our portfolio of operating properties was comprised of the following office properties at December 31, 2012. During the fourth quarter of 2012 we disposed of our industrial portfolio and, as a result, no longer owned any industrial properties at December 31, 2012 (see Note 17 and 18 for further discussion).

	Number of Buildings	Rentable Square Feet (unaudited)	Number of Tenants	Percent Occupied
Office Properties	114	13,249,780	530	92.8	%

Our stabilized portfolio includes all of our properties with the exception of undeveloped land, development and redevelopment properties currently under construction or committed for construction including 9455 Towne Center in San Diego, CA, which was moved from the stabilized portfolio to the development pipeline in the fourth quarter of 2012, "lease-up" properties and properties held-for-sale. We define redevelopment properties as those projects for which we expect to spend significant development and construction costs on existing or acquired buildings pursuant to a formal plan, the intended result of which is a higher economic return on the property. We define "lease-up" properties as properties we recently developed or redeveloped that have not yet reached 95% occupancy and are within one year following cessation of major construction activities. As of December 31, 2012, the following properties were excluded from our stabilized portfolio:

	Number of Properties	Estimated Rentable Square Feet (unaudited) (1)
Development properties under construction	4	1,416,000
Redevelopment properties under construction	1	410,000
Lease-up properties	1	98,000

________________________

(1) Estimated rentable square feet upon completion.

As of December 31, 2012, all of our properties and development and redevelopment projects are owned and all of our business is currently conducted in the state of California with the exception of ten office properties located in the state of Washington.

As of December 31, 2012, the Company owned a 97.6% general partnership interest in the Operating Partnership. The remaining 2.4% common limited partnership interest in the Operating Partnership as of December 31, 2012 was owned by non-affiliated investors and certain of our directors and officers (see Note 9). Both the general and limited common partnership interests in the Operating Partnership are denominated in common units. The number of common units held by the Company is at all times equivalent to the number of outstanding shares of the Company's common stock, and the rights of all the common units to quarterly distributions and payments in liquidation mirror those of the Company's common stockholders. The common limited partners have certain redemption rights as provided in the Operating Partnership's Seventh Amended and Restated Agreement of Limited Partnership (as amended, the “Partnership Agreement”) (see Note 9).

Kilroy Realty Finance, Inc., a wholly-owned subsidiary of the Company, is the sole general partner of the Finance Partnership and owns a 1.0% general partnership interest. The Operating Partnership owns the remaining 99.0% limited partnership interest. Kilroy Services, LLC ("KSLLC"), which is a wholly-owned subsidiary of the Operating Partnership, is the entity through which we conduct substantially all of our development activities. With the exception of the Operating Partnership, all of our subsidiaries are wholly-owned.

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Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Tables)

12 Months Ended

Dec. 31, 2012

Net Income Available To Common Unitholders [Line Items]

Net income available to common unitholders

The following table reconciles the numerator and denominator in computing the Company's basic and diluted per-share computations for net income available to common stockholders for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands, except share and per share amounts)
Numerator:
Income (loss) from continuing operations	$	5,447		$	(3,728	)	(427		)
Loss from continuing operations attributable to noncontrolling common units of the Operating Partnership	383			545			468
Preferred distributions and dividends	(21,088		)	(15,196		)	(15,196		)
Allocation to participating securities (nonvested shares and time-based RSUs)	(1,602		)	(1,309		)	(1,151		)
Numerator for basic and diluted loss from continuing operations available to common stockholders	(16,860		)	(19,688		)	(16,306		)
Income from discontinued operations	271,654			71,217			20,313
Income from discontinued operations attributable to noncontrolling common units of the Operating Partnership	(6,570		)	(2,019		)	(646		)
Numerator for basic and diluted net income available to common stockholders	$	248,224		$	49,510		$	3,361
Denominator:
Basic weighted average vested shares outstanding	69,639,623			56,717,121			49,497,487
Effect of dilutive securities—contingently issuable shares and stock options	—			—			—
Diluted weighted average vested shares and common share equivalents outstanding	69,639,623			56,717,121			49,497,487
Basic earnings per share:
Loss from continuing operations available to common stockholders per share	$	(0.24	)	$	(0.35	)	$	(0.33	)
Income from discontinued operations per common share	3.80			1.22			0.40
Net income available to common stockholders per share	$	3.56		$	0.87		$	0.07
Diluted earnings per share:
Loss from continuing operations available to common stockholders per share	$	(0.24	)	$	(0.35	)	$	(0.33	)
Income from discontinued operations per common share	3.80			1.22			0.40
Net income available to common stockholders per share	$	3.56		$	0.87		$	0.07

Kilroy Realty, L.P. [Member]

Net Income Available To Common Unitholders [Line Items]

Net income available to common unitholders

The following table reconciles the numerator and denominator in computing the Operating Partnership's basic and diluted per-unit computations for net income available to common unitholders for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands, except unit and per unit amounts)
Numerator:
Income (loss) from continuing operations	$	5,447		$	(3,728	)	$	(427	)
Income from continuing operations attributable to noncontrolling interests in consolidated subsidiaries	(174		)	(529		)	(162		)
Preferred distributions	(21,088		)	(15,196		)	(15,196		)
Allocation to participating securities (nonvested units and time-based RSUs)	(1,602		)	(1,309		)	(1,151		)
Numerator for basic and diluted loss from continuing operations available to common unitholders	(17,417		)	(20,762		)	(16,936		)
Income from discontinued operations	271,654			71,217			20,313
Income from discontinued operations attributable to noncontrolling interests in consolidated subsidiaries	(464		)	—			—
Numerator for basic and diluted net income available to common unitholders	$	253,773		$	50,455		$	3,377
Denominator:
Basic weighted average vested units outstanding	71,403,258			58,437,444			51,220,618
Effect of dilutive securities-contingently issuable shares and stock options	—			—			—
Diluted weighted average vested units and common unit equivalents outstanding	71,403,258			58,437,444			51,220,618
Basic earnings per unit:
Loss from continuing operations available to common unitholders per unit	$	(0.24	)	$	(0.36	)	$	(0.33	)
Income from discontinued operations per common unit	3.80			1.22			0.40
Net income available to common unitholders per unit	$	3.56		$	0.86		$	0.07
Diluted earnings per unit:
Loss from continuing operations available to common unitholders per unit	$	(0.24	)	$	(0.36	)	$	(0.33	)
Income from discontinued operations per common unit	3.80			1.22			0.40
Net income available to common unitholders per unit	$	3.56		$	0.86		$	0.07

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Subsequent Events (Details) (USD $)	12 Months Ended				0 Months Ended		3 Months Ended	12 Months Ended								0 Months Ended
	Dec. 31, 2012 sqft		Dec. 31, 2011	Dec. 31, 2010	Jan. 15, 2013 Subsequent Event [Member]	Jan. 10, 2013 Subsequent Event [Member]	Mar. 31, 2013 Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member] Subsequent Event [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member]	Dec. 31, 2011 Kilroy Realty, L.P. [Member]	Dec. 31, 2010 Kilroy Realty, L.P. [Member]	Dec. 31, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member]		Jul. 24, 2012 Kilroy Realty, L.P. [Member] Secured Debt [Member] 6.37% Mortgage Payable due April 2013 [Member] building	Jan. 14, 2013 Kilroy Realty, L.P. [Member] Unsecured Debt [Member] Unsecured Senior Notes, 3 Point 8 Percent, Due 2023 [Member] Subsequent Event [Member]	Jan. 16, 2013 South Lake Union Submarket [Member] Subsequent Event [Member] sqft	Jan. 10, 2013 Restricted Stock Units (RSUs) [Member] Subsequent Event [Member]
Subsequent Event [Line Items]
Repayments of Secured Debt							$ 83,100,000
Principal amount													83,600,000	300,000,000
Stated interest rate											6.37%	[1],[2],[3]		3.80%
Subsequent Events (Textuals) [Abstract]
Aggregate dividends, distributions, and dividend equivalents paid to common stockholders and common unitholders	97,386,000		80,005,000	69,224,000	26,200,000			97,386,000	80,005,000	69,224,000
Rentable square feet	13,249,780	[4]													320,000
Business Combination, Consideration Transferred															170,000,000
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred															83,900,000
Number of buildings													1
Granted (in shares)																157,744
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Fair Value																$ 7,700,000
Share Price						$ 48.88
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights																P5Y

[1] The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.

[2] All interest rates presented are fixed-rate interest rates.

[3] In July 2012, in connection with the acquisition of one office building in Bellevue, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $83.6 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $1.4 million. The loan requires monthly principal and interest payments based on a 30 year amortization period. In January 2013, we repaid this loan prior to the stated maturity.

[4] Includes square footage from our stabilized portfolio.

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Consolidated Statements of Cash Flows (KILROY REALTY, L.P.) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 277,101	$ 67,489	$ 19,886
Adjustments to reconcile net income to net cash provided by operating activities (including discontinued operations):
Depreciation and amortization of building and improvements and leasing costs	168,687	135,467	102,898
(Decrease) increase in provision for bad debts	(42)	644	(1,063)
Depreciation of furniture, fixtures and equipment	1,213	1,130	911
Noncash amortization of share-based compensation awards (Note 12)	7,670	4,482	6,031
Noncash amortization of deferred financing costs and net debt discounts	8,433	13,540	12,490
Noncash amortization of net (below)/above market rents (Note 4)	(6,699)	1,056	1,377
Net gain on dispositions of discontinued operations (Note 17)	(259,245)	(51,587)	(949)
Noncash amortization of deferred revenue related to tenant-funded tenant improvements (Note 8)	(9,136)	(9,349)	(9,689)
Straight-line rents	(21,530)	(21,331)	(13,616)
Loss on early extinguishment of debt (Note 7)	0	0	4,564
Net change in operating assets	(1,297)	(5,434)	(9,065)
Net change in operating liabilities	17,320	2,779	5,509
Insurance proceeds received for property damage and other, net	(1,751)	(630)	543
Net cash provided by operating activities	180,724	138,256	119,827
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisition of operating properties (Note 3)	(454,841)	(603,301)	(637,620)
Expenditures for acquisitions of development and redevelopment properties (Note 3)	(333,942)	0	0
Expenditures for operating properties	(86,377)	(62,739)	(71,099)
Expenditures for development and redevelopment properties and undeveloped land	(83,310)	(28,517)	(21,832)
Net proceeds received from dispositions of operating properties (Note 17)	263,572	64,171	14,978
Insurance proceeds received for property damage	1,751	0	0
Decrease (increase) in acquisition-related deposits	5,000	(5,000)	0
(Increase) decrease in restricted cash (Note 3)	(18,359)	1,103	3,120
Receipt of principal payments on note receivable	0	0	10,679
Net cash used in investing activities	(706,506)	(634,283)	(701,774)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of Series G and Series H preferred stock (Note 10)	192,411	0	0
Payments for Repurchase of Redeemable Preferred Stock			0
Borrowings on unsecured line of credit	704,000	550,000	660,000
Repayments on unsecured line of credit	(701,000)	(527,000)	(598,000)
Proceeds from issuance of secured debt (Note 7)	97,000	135,000	71,000
Principal payments on secured debt	(106,262)	(127,665)	(103,247)
Proceeds from the issuance of unsecured senior notes (Note 7)	150,000	324,476	572,672
Repayments of unsecured debt (Note 7)	0	0	(61,000)
Repurchase of exchangeable senior notes (Note 7)	0	0	(151,097)
Repayments of exchangeable senior notes (Note 7)	(148,000)	0	0
Financing costs	(7,963)	(9,060)	(14,912)
Decrease (increase) in loan deposits and other	0	2,859	(605)
Repurchase/redemption of common units and restricted stock units	(1,661)	(1,152)	(3,417)
Proceeds from exercise of stock options	129	395	83
Distributions paid to common unitholders	(97,386)	(80,005)	(69,224)
Distributions paid to preferred unitholders	(14,165)	(15,196)	(15,196)
Net cash provided by financing activities	537,705	485,964	586,904
Net increase (decrease) in cash and cash equivalents	11,923	(10,063)	4,957
Cash and cash equivalents, beginning of period	4,777	14,840	9,883
Cash and cash equivalents, end of period	16,700	4,777	14,840
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $17,657, $7,615, and $7,697 as of December 31, 2012, 2011 and 2010, respectively	71,633	68,280	45,986
NONCASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	54,198	14,301	19,563
Tenant improvements funded directly by tenants to third parties	17,719	3,288	4,758
Assumption of secured debt with property acquisition (Notes 3 and 7)	221,032	30,042	51,079
Assumption of other assets and liabilities in connection with operating and development property acquisitions, net (Note 3)	37,535	4,515	10,840
NONCASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Note 11)	26,863	21,188	18,925
Accrual of distributions payable to preferred unitholders (Note 11)	1,694	1,909	1,909
Issuance of share-based compensation awards (Note 12)	31,396	7,797	5,910
Issuance of common units in the Operating Partnership in connection with an operating property acquisition (Note 3)	5,604	0	0
Kilroy Realty, L.P. [Member]
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	277,101	67,489	19,886
Adjustments to reconcile net income to net cash provided by operating activities (including discontinued operations):
Depreciation and amortization of building and improvements and leasing costs	168,687	135,467	102,898
(Decrease) increase in provision for bad debts	(42)	644	(1,063)
Depreciation of furniture, fixtures and equipment	1,213	1,130	911
Noncash amortization of share-based compensation awards (Note 12)	7,670	4,482	6,031
Noncash amortization of deferred financing costs and net debt discounts	8,433	13,540	12,490
Noncash amortization of net (below)/above market rents (Note 4)	(6,699)	1,056	1,377
Net gain on dispositions of discontinued operations (Note 17)	(259,245)	(51,587)	(949)
Noncash amortization of deferred revenue related to tenant-funded tenant improvements (Note 8)	(9,136)	(9,349)	(9,689)
Straight-line rents	(21,530)	(21,331)	(13,616)
Loss on early extinguishment of debt (Note 7)	0	0	4,564
Net change in operating assets	(1,297)	(5,434)	(9,065)
Net change in operating liabilities	17,320	2,779	5,509
Insurance proceeds received for property damage and other, net	(1,751)	(630)	543
Net cash provided by operating activities	180,724	138,256	119,827
CASH FLOWS FROM INVESTING ACTIVITIES:
Expenditures for acquisition of operating properties (Note 3)	(454,841)	(603,301)	(637,620)
Expenditures for acquisitions of development and redevelopment properties (Note 3)	(333,942)	0	0
Expenditures for operating properties	(86,377)	(62,739)	(71,099)
Expenditures for development and redevelopment properties and undeveloped land	(83,310)	(28,517)	(21,832)
Net proceeds received from dispositions of operating properties (Note 17)	263,572	64,171	14,978
Insurance proceeds received for property damage	1,751	0	0
Decrease (increase) in acquisition-related deposits	5,000	(5,000)	0
(Increase) decrease in restricted cash (Note 3)	(18,359)	1,103	3,120
Receipt of principal payments on note receivable	0	0	10,679
Net cash used in investing activities	(706,506)	(634,283)	(701,774)
CASH FLOWS FROM FINANCING ACTIVITIES:
Net proceeds from issuance of Series G and Series H preferred stock (Note 10)	192,411	0	0
Net proceeds from issuance of common units (Note 10)	672,102	233,312	299,847
Borrowings on unsecured line of credit	704,000	550,000	660,000
Repayments on unsecured line of credit	(701,000)	(527,000)	(598,000)
Proceeds from issuance of secured debt (Note 7)	97,000	135,000	71,000
Principal payments on secured debt	(106,262)	(127,665)	(103,247)
Proceeds from the issuance of unsecured senior notes (Note 7)	150,000	324,476	572,672
Repayments of unsecured debt (Note 7)	0	0	(61,000)
Repurchase of exchangeable senior notes (Note 7)	0	0	(151,097)
Repayments of exchangeable senior notes (Note 7)	(148,000)	0	0
Financing costs	(7,963)	(9,060)	(14,912)
Decrease (increase) in loan deposits and other	0	2,859	(605)
Repurchase/redemption of common units and restricted stock units	(1,661)	(1,152)	(3,417)
Proceeds from exercise of stock options	129	395	83
Distributions paid to common unitholders	(97,386)	(80,005)	(69,224)
Distributions paid to preferred unitholders	(14,165)	(15,196)	(15,196)
Net cash provided by financing activities	537,705	485,964	586,904
Net increase (decrease) in cash and cash equivalents	11,923	(10,063)	4,957
Cash and cash equivalents, beginning of period	4,777	14,840	9,883
Cash and cash equivalents, end of period	16,700	4,777	14,840
SUPPLEMENTAL CASH FLOWS INFORMATION:
Cash paid for interest, net of capitalized interest of $17,657, $7,615, and $7,697 as of December 31, 2012, 2011 and 2010, respectively	71,633	68,280	45,986
NONCASH INVESTING TRANSACTIONS:
Accrual for expenditures for operating properties and development and redevelopment properties	54,198	14,301	19,563
Tenant improvements funded directly by tenants to third parties	17,719	3,288	4,758
Assumption of secured debt with property acquisition (Notes 3 and 7)	221,032	30,042	51,079
Assumption of other assets and liabilities in connection with operating and development property acquisitions, net (Note 3)	37,535	4,515	10,840
NONCASH FINANCING TRANSACTIONS:
Accrual of distributions payable to common unitholders (Note 11)	26,863	21,188	18,925
Accrual of distributions payable to preferred unitholders (Note 11)	1,694	1,909	1,909
Issuance of share-based compensation awards (Note 12)	31,396	7,797	5,910
Issuance of common units in the Operating Partnership in connection with an operating property acquisition (Note 3)	5,604	0	0
Series E and Series F Cumulative Redeemable Preferred Stock [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments for Repurchase of Redeemable Preferred Stock	(126,500)	0
Series E and Series F Cumulative Redeemable Preferred Stock [Member] | Kilroy Realty, L.P. [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments for Repurchase of Redeemable Preferred Stock	(126,500)	0	0
Series A Preferred Units [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments for Repurchase of Redeemable Preferred Stock	(75,000)	0
Series A Preferred Units [Member] | Kilroy Realty, L.P. [Member]
CASH FLOWS FROM FINANCING ACTIVITIES:
Payments for Repurchase of Redeemable Preferred Stock	$ (75,000)	$ 0	$ 0

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Consolidated Statements of Cash Flows (KILROY REALTY, L.P.) Parenthetical (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Capitalized interest	$ 17,657	$ 7,615	$ 7,697
Kilroy Realty, L.P. [Member]
Capitalized interest	$ 17,657	$ 7,615	$ 7,697

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Basis of Presentation and Significant Accounting Policies

12 Months Ended

Dec. 31, 2012

Basis of Presentation and Significant Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies [Text Block]

Basis of Presentation and Significant Accounting Policies

Basis of Presentation

The consolidated financial statements of the Company include the consolidated financial position and results of operations of the Company, the Operating Partnership, the Finance Partnership, KSLLC, and all of our wholly-owned subsidiaries. The consolidated financial statements of the Operating Partnership include the consolidated financial position and results of operations of the Operating Partnership, the Finance Partnership, KSLLC, and all wholly-owned and controlled subsidiaries of the Operating Partnership. All intercompany balances and transactions have been eliminated in the consolidated financial statements.

Consolidated Variable Interest Entities

As of December 31, 2012 the consolidated financial statements of the Company and the Operating Partnership also included two variable interest entities ("VIEs") in which we are deemed to be the primary beneficiary. During the year ended December 31, 2012, one operating property and one development project were acquired in two separate transactions and transferred to two special purpose VIEs to facilitate potential Section 1031 Exchanges. To realize the tax deferral available under the Section 1031 Exchange, the Company must complete the Section 1031 Exchanges, if any, and take title to the to-be-exchanged properties within 180 days of the acquisition dates (see Note 3). The VIEs were terminated subsequent to year-end. The impact of consolidating the VIEs increased the Company's total assets and liabilities by approximately $337.0 million (of which $319.8 million is related to real estate held for investment on our consolidated balance sheets) and $111.1 million, respectively, at December 31, 2012. As of December 31, 2011, the consolidated financial statements of the Company and the Operating Partnership included one VIE in which we were deemed to be the primary beneficiary, which was established in September 2011 to facilitate a Section 1031 Exchange. The impact of consolidating this VIE increased the Company's total assets and liabilities by approximately $108.5 million (of which $101.4 million was related to real estate held for investment on our consolidated balance sheets) and $7.3 million, respectively, at December 31, 2011. This Section 1031 Exchange was completed in January 2012 and this entity was no longer a VIE at December 31, 2012.

Change in Segment Reporting

At December 31, 2012 we only had one segment, which was our office properties segment, because all of our industrial properties were sold during the year ended December 31, 2012. During the year ended December 31, 2011 we had one reportable segment, which was our office properties segment, and we had one non-reportable segment, which was our industrial properties segment.

For the year ended December 31, 2011, the amount of revenues and Net Operating Income generated by our industrial properties, in relation to our total consolidated operating portfolio revenues and Net Operating Income, fell below the required 10% quantitative reporting threshold and the industrial properties were no longer considered to be a reportable segment under GAAP.  For the year ended December 31, 2010, the amount of revenues and Net Operating Income generated by our industrial properties, in relation to our total consolidated operating portfolio revenues and Net Operating Income, was greater than the required 10% quantitative reporting threshold and the industrial properties were considered to be a reportable segment under GAAP.

Significant Accounting Policies

Acquisitions

We record the acquired tangible and intangible assets and assumed liabilities of acquisitions of operating properties and development and redevelopment opportunities that meet the accounting criteria to be accounted for as business combinations at fair value at the acquisition date. The acquired assets and assumed liabilities for an acquisition generally include but are not limited to: land, buildings and improvements, undeveloped land and construction in progress; and identified tangible and intangible assets and liabilities associated with in-place leases, including tenant improvements, leasing costs, value of above-market and below-market operating leases and ground leases, acquired in-place lease values and tenant relationships, if any. Any debt assumed and equity (including common units of the Operating Partnership) issued in connection with a property acquisition is recorded at fair value on the date of acquisition.

The fair value of land is derived from comparable sales of land within the same submarket and/or region. The fair value of buildings and improvements, tenant improvements, and leasing costs are based upon current market replacement costs and other relevant market rate information.

The fair value of the above-market or below-market component of an acquired in-place operating lease is based upon the present value (calculated using a market discount rate) of the difference between (i) the contractual rents to be paid pursuant to the lease over its remaining non-cancellable lease term and (ii) management's estimate of the rents that would be paid using fair market rental rates and rent escalations at the date of acquisition measured over the remaining non-cancellable term of the lease for above-market operating leases and the initial non-cancellable term plus the term of any below-market fixed rate renewal options, if applicable, for below-market operating leases. Our below-market operating leases generally do not include fixed rate or below-market renewal options. The amounts recorded for above-market operating leases are included in deferred leasing costs and acquisition-related intangibles, net on the balance sheet and are amortized on a straight-line basis as a reduction of rental income over the remaining term of the applicable leases. The amounts recorded for below-market operating leases are included in deferred revenue and acquisition-related liabilities, net on the balance sheet and are amortized on a straight-line basis as an increase to rental income over the remaining term of the applicable leases plus the term of any below-market fixed rate renewal options, if applicable.

The fair value of acquired in-place leases is derived based on management's assessment of lost revenue and costs incurred for the period required to lease the "assumed vacant" property to the occupancy level when purchased. The amount recorded for acquired in-place leases is included in deferred leasing costs and acquisition-related intangibles, net on the balance sheet and amortized as an increase to depreciation and amortization expense over the remaining term of the applicable leases.

We record the acquisition of undeveloped land that does not meet the accounting criteria to be accounted for as business combinations and the subsequent acquisition of the fee interest in land underlying our properties at the purchase price paid and capitalize the associated acquisition costs. During the year ended December 31, 2012, we capitalized $0.7 million in acquisition costs associated with the acquisition of undeveloped land.

Fully amortized intangible assets are written off on January 1st of each fiscal year.

Operating Properties

Operating properties are generally carried at historical cost less accumulated depreciation. Properties held for sale are reported at the lower of the carrying value or the fair value less estimated cost to sell. The cost of operating properties includes the purchase price or development costs of the properties. Costs incurred for the renovation and betterment of the operating properties are capitalized to our investment in that property. Maintenance and repairs are charged to expense as incurred.

When evaluating properties to be held and used for potential impairment, we first evaluate whether there are any indicators of impairment for any of our properties. If any impairment indicators are present for a specific property, we then perform an undiscounted cash flow analysis and compare the net carrying amount of the property to the property's estimated undiscounted future cash flow over the anticipated holding period. If the estimated undiscounted future cash flow is less than the net carrying amount of the property, we then perform an impairment loss calculation to determine if the fair value of the property is less than the net carrying value of the property. Our impairment loss calculation compares the net carrying amount of the property to the property's estimated fair value, which may be based on estimated discounted future cash flow calculations or third-party valuations or appraisals. We would recognize an impairment loss if the asset's net carrying amount exceeds the asset's estimated fair value. If we were to recognize an impairment loss, the estimated fair value of the asset (less costs to sell for assets held for sale) would become its new cost basis. For a depreciable long-lived asset, the new cost basis would be depreciated (amortized) over the remaining useful life of that asset. We did not record any impairment losses for the periods presented.

Cost Capitalization

All costs clearly associated with the development, redevelopment and construction of a property are capitalized as project costs, including internal compensation costs. In addition, the following costs are capitalized as project costs during periods in which activities necessary to prepare development and redevelopment properties for its intended use are in progress: pre-construction costs essential to the development of the property, interest, real estate taxes, insurance.

• For development and redevelopment properties that are pre-leased, we cease capitalization when revenue recognition commences, which is upon substantial completion of tenant improvements.

• For development and redevelopment properties that are not pre-leased, we may not immediately build out the tenant improvements. Therefore we cease capitalization when revenue recognition commences upon substantial completion of the tenant improvements, but in any event not later than one year after the cessation of major construction activities. We also cease capitalization on a development or redevelopment property when activities necessary to prepare the property for its intended use have been suspended.

• For development or redevelopment properties with multiple tenants and staged leasing, we cease capitalization and begin depreciation on the portion of the development or redevelopment property for which revenue recognition has commenced.

Once major construction activity has ceased and the development or redevelopment property is in the lease-up phase, the costs capitalized to construction in progress are transferred to land and improvements, buildings and improvements, and deferred leasing costs on our consolidated balance sheets as the historical cost of the property.

Depreciation and Amortization of Buildings and Improvements

The cost of buildings and improvements and tenant improvements are depreciated using the straight-line method of accounting over the estimated useful lives set forth in the table below. Depreciation expense for buildings and improvements, including discontinued operations, for the three years ended December 31, 2012, 2011, and 2010 was $125.9 million, $106.0 million and $86.3 million, respectively.

Asset Description	Depreciable Lives
Buildings and improvements	25 – 40 years
Tenant improvements	1 – 20 years(1)

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(1) Tenant improvements are amortized over the shorter of the lease term or the estimated useful life. 

Discontinued Operations and Properties Held for Sale

The revenues and expenses of operating properties that have been sold, if material, and the revenues and expenses of operating properties that have been classified as held for sale, if material, are reported in the consolidated statements of operations as discontinued operations for all periods presented through the date of the applicable disposition. The net gains (losses) on disposition of operating properties are reported in the consolidated statements of operations as discontinued operations in the period the properties are sold. In determining whether the revenues, expenses, and net gains (losses) on dispositions of operating properties are reported as discontinued operations, we evaluate whether we have any significant continuing involvement in the operations, leasing, or management of the sold property. If we were to determine that we had any significant continuing involvement, the revenues, expenses and net gain (loss) on dispositions of the operating property would not be recorded in discontinued operations.

An operating property is classified as held for sale when certain criteria are met, including but not limited to the availability of the asset for immediate sale, the existence of an active program to locate a buyer, and the probable sale or transfer of the asset within one year. If such criteria are met, we present the applicable assets and liabilities related to the property held for sale, if material, separately on the balance sheet and we would cease to record depreciation and amortization expense. Properties held for sale are reported at the lower of their carrying value or their estimated fair value less the estimated costs to sell. As of December 31, 2012, we did not have any buildings classified as held for sale, and as of December 31, 2011, we had two buildings classified as held for sale, which were sold in January 2012 (see Note 17).

Revenue Recognition

We recognize revenue from rent, tenant reimbursements, parking, and other revenue once all of the following criteria are met:

• the agreement has been fully executed and delivered;

• services have been rendered;

• the amount is fixed or determinable; and

• the collectability of the amount is reasonably assured.

Minimum annual rental revenues are recognized in rental revenues on a straight-line basis over the term of the related lease. Rental revenue recognition commences when the tenant takes possession or controls the physical use of the leased space. In order for the tenant to take possession, the leased space must be substantially ready for its intended use. To determine whether the leased space is substantially ready for its intended use, management evaluates whether we are or the tenant is the owner of tenant improvements for accounting purposes. When management concludes that we are the owner of tenant improvements, rental revenue recognition begins when the tenant takes possession of the finished space, which is when such tenant improvements are substantially complete. In certain instances, when management concludes that we are not the owner (the tenant is the owner) of tenant improvements, rental revenue recognition begins when the tenant takes possession of or controls the space.

When management concludes that we are the owner of tenant improvements for accounting purposes, management records the cost to construct the tenant improvements as a capital asset. In addition, management records the cost of certain tenant improvements paid for or reimbursed by tenants as capital assets when management concludes that we are the owner of such tenant improvements. For these tenant improvements, management records the amount funded or reimbursed by tenants as deferred revenue, which is amortized on a straight-line basis as additional rental income over the term of the related lease.

When management concludes that the tenant is the owner of tenant improvements for accounting purposes, management records our contribution towards those improvements as a lease incentive, which is included in deferred leasing costs and acquisition-related intangibles, net on our consolidated balance sheets and amortized as a reduction to rental income on a straight-line basis over the term of the lease.

Tenant Reimbursements

Reimbursements from tenants, consisting of amounts due from tenants for common area maintenance, real estate taxes, and other recoverable costs, are recognized as revenue in the period the recoverable costs are incurred. Tenant reimbursements are recognized and recorded on a gross basis, as we are generally the primary obligor with respect to purchasing goods and services from third-party suppliers, have discretion in selecting the supplier, and have credit risk.

Other Property Income

Other property income primarily includes amounts recorded in connection with lease terminations and tenant bankruptcy settlement payments. Lease termination fees are amortized over the remaining lease term, if applicable. If there is no remaining lease term, they are recognized when received and realized. Other property income also includes miscellaneous income from tenants, such as fees related to the restoration of leased premises to their original condition and fees for late rental payments.

Allowances for Uncollectible Tenant and Deferred Rent Receivables

We carry our current and deferred rent receivables net of allowances for uncollectible amounts. Our determination of the adequacy of these allowances is based primarily upon evaluations of individual receivables, current economic conditions, historical loss experience, and other relevant factors. The allowances are increased or decreased through the provision for bad debts on our consolidated statements of operations.

Cash and Cash Equivalents

We consider all highly-liquid investments with original maturities of three months or less to be cash equivalents.

Restricted Cash

Restricted cash consists of cash proceeds from dispositions that are temporarily held at qualified intermediaries for purposes of facilitating potential Section 1031 Exchanges and cash held in escrow related to acquisition holdbacks. Restricted cash also includes cash held as collateral to provide credit enhancement for the Operating Partnership's mortgage debt, including cash reserves for capital expenditures, tenant improvements, and property taxes.

Marketable Securities / Deferred Compensation Plan

Marketable securities reported in our consolidated balance sheets represent the assets held in connection with the Kilroy Realty Corporation 2007 Deferred Compensation Plan (the "Deferred Compensation Plan") (see Note 13). The Deferred Compensation Plan assets are held in a limited rabbi trust and invested in various mutual and money market funds. As a result, the marketable securities are treated as trading securities for financial reporting purposes and are adjusted to fair value at the end of each accounting period, with the corresponding gains and losses recorded in interest income and other net investment gains.

At the time eligible management employees ("Participants") defer compensation or earn mandatory Company contributions, or if we were to make a discretionary contribution, we record compensation cost and a corresponding deferred compensation plan liability, which is included in accounts payable, accrued expenses, and other liabilities on our consolidated balance sheets. This liability is adjusted to fair value at the end of each accounting period based on the performance of the benchmark funds selected by each Participant, and the impact of adjusting the liability to fair value is recorded as an increase or decrease to compensation cost. The impact of adjusting the deferred compensation plan liability to fair value and the changes in the value of the marketable securities held in connection with the Deferred Compensation Plan generally offset and therefore does not significantly impact net income.

Deferred Leasing Costs

Costs incurred in connection with successful property leasing are capitalized as deferred leasing costs and classified as investment activities in the statement of cash flows. Deferred leasing costs consist primarily of leasing commissions and also include certain internal payroll costs and lease incentives, which are amortized using the straight-line method of accounting over the lives of the leases which generally range from one to 20 years. We reevaluate the remaining useful lives of leasing costs as the creditworthiness of our tenants and economic and market conditions change. If we determine that the estimated remaining life of a lease has changed, we adjust the amortization period accordingly. Fully amortized deferred leasing costs are written off on January 1st of each fiscal year.

Deferred Financing Costs

Financing costs related to the origination or assumption of long-term debt are deferred and generally amortized using the straight-line method of accounting, which approximates the effective interest method, over the contractual terms of the applicable financings. As of December 31, 2012 and 2011, deferred financing costs were reported net of accumulated amortization of $16.6 million and $16.8 million, respectively.

Debt Discounts and Premiums

Original issuance debt discounts and discounts/premiums related to recording debt acquired in connection with operating property acquisitions at fair value are generally amortized and accreted on a straight-line basis, which approximates the effective interest method. Discounts are recorded as additional interest expense from date of issuance or acquisition through the contractual maturity date of the related debt. Premiums are recorded as a reduction to interest expense from the date of issuance or acquisition through the contractual maturity date of the related debt. Our secured debt is presented including unamortized premiums of $7.2 million and $0.8 million as of December 31, 2012 and 2011, respectively. Our unsecured senior notes are presented net of unamortized discounts of $2.1 million and $2.4 million, as of December 31, 2012 and 2011, respectively.

Exchangeable Debt Instruments

The initial proceeds from exchangeable debt that may be settled in cash, including partial cash settlements, are bifurcated between a liability component and an equity component associated with the embedded conversion option. The liability and equity components of exchangeable debt are separately accounted for in a manner such that the interest expense on the exchangeable debt is not recorded at the stated rate of interest but rather at an effective rate that reflects the issuer’s conventional debt borrowing rate at the date of issuance.

We calculate the liability component of exchangeable debt based on the present value of the contractual cash flows discounted at a comparable market conventional debt borrowing rate at the date of issuance. The difference between the principal amount and the fair value of the liability component is reported as a discount on the exchangeable debt that is accreted as additional interest expense from the issuance date through the contractual maturity date using the effective interest method. A portion of this additional interest expense is capitalized to the development and redevelopment balances qualifying for interest capitalization each period. The liability component of the exchangeable debt is reported net of discounts on our consolidated balance sheets.

We calculate the equity component of exchangeable debt based on the difference between the initial proceeds received from the issuance of the exchangeable debt and the fair value of the liability component at the issuance date. The equity component is included in additional paid-in-capital, net of issuance costs, on our consolidated balance sheets. We allocate issuance costs for exchangeable debt between the liability and the equity components based on their relative values.

Gains and Losses on Early Extinguishment of Debt

Gains and losses on early extinguishment of debt represents the gains and losses recorded in connection with the repurchases of portions of our 3.25% Exchangeable Notes, which were outstanding during the year ended December 31, 2011 and repaid during the year ended December 31, 2012 (see Note 7). We calculate the gain or loss on early extinguishment of debt as the difference on the repurchase date between the estimated fair value of the liability component and the net carrying amount of the repurchased exchangeable debt. Deferred financing costs are written off against the gain on early extinguishment of debt or added to the loss on early extinguishment of debt in proportion to the exchangeable debt repurchased.

Noncontrolling Interests in the Company's Consolidated Financial Statements

Noncontrolling interests in the Company's consolidated financial statements represent the issued 1,510,000 7.45% Series A Cumulative Redeemable Preferred Units of the Operating Partnership (“Series A Preferred Units”) which were outstanding at December 31, 2011 and common limited partnership interests in the Operating Partnership not held by the Company (“noncontrolling common units”).

The Series A Preferred Units were presented in the temporary equity section of the Company's consolidated balance sheets after total liabilities and before equity and reported at redemption value, less issuance costs, given that the Series A Preferred Units contained a right of redemption at the option of the holders in the event of certain corporate events. On August 15, 2012, the Operating Partnership redeemed all Series A Preferred Units (see Note 9).

Noncontrolling common units are presented in the equity section of the Company's consolidated balance sheets and reported at their proportionate share of the net assets of the Operating Partnership. Noncontrolling interests with redemption provisions that permit the issuer to settle in either cash or shares of common stock at the option of the issuer must be further evaluated to determine whether equity or temporary equity classification on the balance sheet is appropriate. Since the common units contain such a provision, we evaluated the accounting guidance and determined that the common units qualify for equity presentation in the Company's consolidated financial statements (see Note 9).

Net income attributable to noncontrolling common units is allocated based on their relative ownership percentage of the Operating Partnership during the reported period. The noncontrolling interest ownership percentage is determined by dividing the number of noncontrolling common units by the total number of common units outstanding. The issuance or redemption of additional shares of common stock or common units results in changes to the noncontrolling interest percentage as well as the total net assets of the Company. As a result, all equity transactions result in an allocation between equity and the noncontrolling interest in the Company’s consolidated balance sheets and statements of equity to account for the changes in the noncontrolling interest ownership percentage as well as the change in total net assets of the Company.

Preferred Partnership Interests on the Operating Partnership's Consolidated Balance Sheets

Preferred partnership interests of the Operating Partnership represent the issued and outstanding 4,000,000 6.875% Series G Cumulative Redeemable Preferred Units ("Series G Preferred Units") and the 4,000,000 6.375% Series H Cumulative Redeemable Preferred Units ("Series H Preferred Units"), which were outstanding as of December 31, 2012. The Series A Preferred Units, 1,610,000 7.80% Series E Cumulative Redeemable Preferred Units ("Series E Preferred Units") and 3,450,000 7.50% Series F Cumulative Redeemable Preferred Units ("Series F Preferred Units") were outstanding as of December 31, 2011 and redeemed during the year ended December 31, 2012.

The Series A Preferred Units were presented in the temporary equity section of the Operating Partnership's consolidated balance sheets after total liabilities and before equity and reported at redemption value, less issuance costs, given that the Series A Preferred Units contain a right of redemption at the option of the holders in the event of certain corporate events (see Note 9).

The Series G and Series H Preferred Units are presented in the permanent equity section of the Operating Partnership's consolidated balance sheets given that the Series G and Series H Preferred Units may be redeemed only at our option (see Note 11). The Company is the holder of both the Series G and Series H Preferred Units and for each Series G and Series H Preferred Unit, the Company has an equivalent number of shares of the Company's 6.875% Series G Cumulative Redeemable Preferred Stock and shares of the Company's 6.375% Series H Cumulative Redeemable Preferred Stock publicly issued and outstanding. The Series E Preferred Units and Series F Preferred Units were presented in the permanent equity section of the Operating Partnership's consolidated balance sheets at December 31, 2011, similar to the Series G and Series H Preferred Units.

Common Partnership Interests on the Operating Partnership's Consolidated Balance Sheets

The common units held by the Company and the noncontrolling common units held by the common limited partners are both presented in the permanent equity section of the Operating Partnership's consolidated balance sheets in partners' capital. The redemption rights of the noncontrolling common units permit us to settle the redemption obligation in either cash or shares of the Company's common stock at our option (see Note 9).

Noncontrolling Interests on the Operating Partnership's Consolidated Balance Sheets

Noncontrolling interests of the Operating Partnership represent the Company's 1.0% general partnership interest in the Finance Partnership. This noncontrolling interest is presented in the permanent equity section of the Operating Partnership's consolidated balance sheets given that these interests are not convertible or redeemable into any other ownership interest of the Company or the Operating Partnership.

Equity Offerings

Underwriting commissions and offering costs incurred in connection with common equity offerings and our at-the-market stock offering program (see Note 10) are reflected as a reduction of additional paid-in capital. Issuance costs incurred in connection with preferred equity offerings are reflected as a reduction of the carrying value of the preferred equity.

The Company records preferred stock issuance costs as a non-cash preferred equity distribution at the time we notify the holders of preferred stock or units of our intent to redeem such shares or units.

The net proceeds from any equity offering of the Company are contributed to the Operating Partnership in exchange for a number of common or preferred units equivalent to the number of shares of common or preferred stock issued and are reflected in the Operating Partnership's consolidated financial statements as an increase in partners' capital.

Share-based Incentive Compensation Accounting

Compensation cost for all share-based awards, including options, requires measurement at estimated fair value on the grant date and recognition of the compensation cost is recognized over the service vesting period, which represents the requisite service period, on a straight-line basis. The grant date fair value of market measure-based share-based compensation plans are calculated using a Monte Carlo simulation pricing model. The grant date fair value of stock option grants is calculated using the Black-Scholes valuation model.

For share-based awards in which the performance period precedes the grant date, we recognize compensation cost over the requisite service period, which includes both the performance and service vesting periods, using the accelerated attribution expense method. The requisite service period begins on the date the Executive Compensation Committee authorizes the award and adopts any relevant performance measures.

During the performance period for a share-based award program when the performance period precedes the grant date, we estimate the total compensation cost of the potential future awards. We then record compensation cost equal to the portion of the requisite service period that has elapsed through the end of the reporting period. For programs with performance-based measures, the total estimated compensation cost is based on our most recent estimate of the probable achievement of the pre-established specific corporate performance measures. These estimates are based on our latest internal forecasts for each performance measure. For programs with market measures, the total estimated compensation cost is based on the fair value of the award at the reporting date.

In accordance with the provisions of our share-based incentive compensation plans, we accept the return of shares of Company common stock, at the current quoted market price, from certain key employees to satisfy minimum statutory tax-withholding requirements related to shares that vested during the period.

For share based awards granted by the Company, the Operating Partnership issues a number of common units equal to the number of shares of common stock ultimately granted by the Company in respect of such awards.

Basic and Diluted Net Income (Loss) Available to Common Stockholders per Share

Basic net income (loss) available to common stockholders per share is computed by dividing net income (loss) available to common stockholders, after the allocation of income to participating securities, by the weighted-average number of vested shares of common stock outstanding, for the period. Diluted net income (loss) available to common stockholders per share is computed by dividing net income (loss) available for common stockholders, after the allocation of income to participating securities, by the sum of the weighted-average number of shares of common stock outstanding for the period plus the assumed exercise of all dilutive securities. The impact of the outstanding common units is considered in the calculation of diluted net income (loss) available to common stockholders per share. The common units are not reflected in the diluted net income (loss) available to common stockholders per share calculation because the exchange of common units into common stock is on a one for one basis, and the common units are allocated net income on a per share basis equal to the common stock (see Note 19). Accordingly, any exchange would not have any effect on diluted net income (loss) available to common stockholders per share.

Nonvested share-based payment awards (including nonvested restricted stock units ("RSUs") and dividend equivalents issued to holders of RSUs) containing nonforfeitable rights to dividends or dividend equivalents are accounted for as participating securities and included in the computation of basic and diluted net income (loss) available to common stockholders per share pursuant to the two-class method. The dilutive effect of stock options are reflected in the weighted average diluted outstanding shares calculation by application of the treasury stock method. The dilutive effect of Exchangeable Notes are reflected in the weighted average diluted outstanding shares calculation when the average quoted trading price of the Company's common stock on the NYSE for the periods presented was above the Exchangeable Notes exchange prices. The dilutive effect of the outstanding nonvested shares of common stock (“nonvested shares”) and RSUs that have not yet been granted but are contingently issuable under the share-based compensation programs is reflected in the weighted average diluted shares calculation by application of the treasury stock method at the beginning of the quarterly period in which all necessary conditions have been satisfied.

Basic and Diluted Net Income (Loss) Available to Common Unitholders per Unit

Basic net income (loss) available to common unitholders per unit is computed by dividing net income (loss) available to common unitholders, after the allocation of income to participating securities, by the weighted-average number of vested common units outstanding, for the period. Diluted net income (loss) available to common unitholders per unit is computed by dividing net income (loss) available to common unitholders, after the allocation of income to participating securities, by the sum of the weighted-average number of common units outstanding for the period plus the assumed exercise of all dilutive securities.

The dilutive effect of stock options, Exchangeable Notes, outstanding nonvested shares, RSUs, and awards containing nonforfeitable rights to dividend equivalents are reflected in diluted net income (loss) available to common unitholders per unit in the same manner as noted above for net income (loss) available to common stockholders per share.

Fair Value Measurements

The fair value of our financial assets and liabilities are disclosed in Note 16 to our consolidated financial statements. The only financial assets recorded at fair value on a recurring basis in our consolidated financial statements are our marketable securities. We elected not to apply the fair value option for any of our eligible financial instruments or other items.

We determine the estimated fair value of financial assets and liabilities utilizing a hierarchy of valuation techniques based on whether the inputs to a fair value measurement are considered to be observable or unobservable in a marketplace. Observable inputs reflect market data obtained from independent sources, while unobservable inputs reflect our market assumptions. This hierarchy requires the use of observable market data when available. The following is the fair value hierarchy:

• Level 1—quoted prices for identical instruments in active markets;

• Level 2—quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations in which significant inputs and significant value drivers are observable in active markets; and

• Level 3—fair value measurements derived from valuation techniques in which one or more significant inputs or significant value drivers are unobservable.

We determine the fair value for the marketable securities using quoted prices in active markets for identical assets. Our other financial instruments, which are only disclosed at fair value, are comprised of secured debt, unsecured senior notes, unsecured line of credit, unsecured term loan facility and Exchangeable Notes.

We generally determine the fair value of our secured debt, unsecured line of credit, and unsecured term loan facility by performing discounted cash flow analyses using an appropriate market discount rate. We calculate the market rate by obtaining period-end treasury rates for maturities that correspond to the maturities of our fixed-rate debt and then adding an appropriate credit spread based on information obtained from third-party financial institutions. We calculate the market rate of our unsecured line of credit and unsecured term loan facility by obtaining the period-end London Interbank Offered Rate ("LIBOR") rate and then adding an appropriate credit spread based on information obtained from third-party financial institutions. These credit spreads take into account factors, including but not limited to, our credit profile, the tenure of the debt, amortization period, whether the debt is secured or unsecured, and the loan-to-value ratio of the debt to the collateral. These calculations are significantly affected by the assumptions used, including the discount rate, credit spreads, and estimates of future cash flow. We determine the fair value of the liability component of our Exchangeable Notes by performing discounted cash flow analyses using an appropriate market interest rate based upon spreads for our publicly traded debt. We determine the fair value of each of our publicly traded unsecured senior notes based on their quoted trading price at the end of the reporting period, if such prices are available.

Carrying amounts of our cash and cash equivalents, restricted cash, and accounts payable approximate fair value due to their short-term maturities.

Income Taxes

We have elected to be taxed as a REIT under Sections 856 through 860 of the Code. To qualify as a REIT, we must distribute annually at least 90% of our adjusted taxable income, as defined in the Code, to our stockholders and satisfy certain other organizational and operating requirements. For distributions with respect to taxable years ended on or before December 31, 2011, IRS guidance allows REITs to satisfy up to 90% of this requirement through the distribution of shares of common stock, if certain conditions are met. We generally will not be subject to federal income taxes if we distribute 100% of our taxable income for each year to our stockholders. If we fail to qualify as a REIT in any taxable year, we will be subject to federal income taxes (including any applicable alternative minimum tax) on our taxable income at regular corporate rates and we may not be able to qualify as a REIT for four subsequent taxable years. Even if we qualify for taxation as a REIT, we may be subject to certain state and local taxes on our income and property and to federal income taxes and excise taxes on our undistributed taxable income. We believe that we have met all of the REIT distribution and technical requirements for the years ended December 31, 2012, 2011 and 2010, and we were not subject to any federal income taxes (see Note 21). We intend to continue to adhere to these requirements and maintain the Company’s REIT status.

In addition, any taxable income from our taxable REIT subsidiary, which was formed in August 2002, is subject to federal, state, and local income taxes. For the year ended December 31, 2012 the taxable REIT subsidiary had less than $60,000 of taxable income and for the years ended December 31, 2011 and 2010 the taxable REIT subsidiary had less than $30,000 of taxable income.

Uncertain Tax Positions

We include favorable tax positions in the calculation of tax liabilities if it is more likely than not that our adopted tax position will prevail if challenged by tax authorities.

As a result of our REIT status, we are able to claim a dividends-paid deduction on our tax return to deduct the full amount of common and preferred dividends paid to stockholders when computing our annual taxable income. Since this dividends-paid deduction has historically exceeded our taxable income, the Company has historically had significant return of capital to its stockholders. In order for us to be required to record any unrecognized tax benefits or additional tax liabilities, any adjustment for potential uncertain tax positions would need to exceed the return of capital.

We evaluated the potential impact of identified uncertain tax positions for all tax years still subject to potential audit under state and federal income tax law and concluded that our return of capital would not be materially affected for any of the years still subject to potential audit. As of December 31, 2012, the years still subject to audit are 2008 through 2011 under the California state income tax law and 2009 through 2011 under the federal income tax law. We concluded that we did not have any unrecognized tax benefits or any additional tax liabilities as of December 31, 2012 and 2011.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reported periods. Actual results could differ from those estimates.

Concentration of Credit Risk

All of our properties and all of our business is currently conducted in the state of California with the exception of the ownership and operation of ten office properties located in the state of Washington. The ability of the tenants to honor the terms of their leases is dependent upon the economic, regulatory, and social factors affecting the communities in which the tenants operate.

As of December 31, 2012, our 15 largest tenants represented approximately 34.1% of total annualized base rental revenues.

We have deposited cash with financial institutions that is insured by the Federal Deposit Insurance Corporation (“FDIC”) up to $250,000 per institution. As of December 31, 2012 and 2011, we had cash accounts in excess of FDIC insured limits.

Recent Accounting Pronouncements

In October 2012, the FASB issued Accounting Standards Update 2012-04, Technical Corrections and Improvements ("ASU 2012-04"), which makes certain technical corrections and “conforming fair value amendments” to the FASB Accounting Standards Codification. The amendments affect various Codification topics and apply to all reporting entities within the scope of those topics. These provisions of the amendment are effective upon issuance, except for amendments that are subject to transition guidance, which will be effective for fiscal periods beginning after December 15, 2012. The provisions of ASU 2012-04 are not expected to have a material impact on our consolidated financial statements.

Effective January 1, 2012, we adopted the provisions of ASU No. 2011-04, Amendment to Achieve Common Fair Value Measurement and Disclosure Requirements in U.S. GAAP and IFRSs ("ASU 2011-04"), which amended ASC Topic 820, Fair Value Measurement. The objective of this guidance is to develop common requirements for measuring fair value and for disclosing information about fair value measurements in accordance with GAAP and International Financial Reporting Standards. The guidance also requires expanded fair value disclosures related to Level 3 financial instruments and Level 3 financial instrument transfers. The guidance does not require any new fair value measurements. The adoption of this guidance did not have a material impact on our consolidated financial statements or notes to our consolidated financial statements.

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Pro Forma Results of the Company (Tables)

12 Months Ended

Dec. 31, 2012

Business Combinations [Abstract]

Pro forma consolidated results of operations of the company

The first table of pro forma consolidated results of operations of the Company for the years ended December 31, 2012 and 2011 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011. The second table of pro forma consolidated results of operations of the Company for the years ended December 31, 2011 and 2010 assumes that the acquisitions of 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, were completed as of January 1, 2011 and that the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, were completed as of January 1, 2010. Pro forma data may not be indicative of the results that would have been reported had the acquisitions actually occurred as of January 1, 2011 and 2010, respectively, nor does it intend to be a projection of future results.

	Year EndedDecember 31,
	2012		2011
	(in thousands except per share amounts)
Revenues from continuing operations	$	414,813	$	363,815
Net income available to common stockholders(1)(3)	$	238,947	$	42,601
Net income available to common stockholders per share - basic(1)(3)	$	3.41	$	0.73
Net income available to common stockholders per share - diluted(1)(3)	$	3.41	$	0.73

	Year EndedDecember 31,
	2011		2010
	(in thousands except per share amounts)
Revenues from continuing operations	$	377,871	$	283,941
Net income available to common stockholders(1)(2)(3)	$	41,293	$	2,491
Net income available to common stockholders per share - basic(1)(2)(3)	$	0.71	$	0.03
Net income available to common stockholders per share - diluted(1)(2)(3)	$	0.71	$	0.03

_________________

(1) The pro forma results for the year ended December 31, 2012 were adjusted to exclude acquisition-related expenses of approximately $1.0 million incurred in 2012 for the acquisition of 4100-4700 Bohannon Drive, Menlo Park, CA , 10900 Northeast 4th Street, Bellevue, WA and 555-599 N. Mathilda Avenue, Sunnyvale, CA. The pro forma results for the year ended December 31, 2011 were adjusted to include these expenses.

(2) The pro forma results for the year ended December 31, 2011 were adjusted to exclude acquisition-related expenses of approximately $0.6 million incurred in 2011 for the acquisitions of 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA. The pro forma results for the year ended December 31, 2010 were adjusted to include these expenses.

(3) The pro forma results for all periods presented include incremental interest expense assuming the acquisitions were funded by pro forma borrowings under the revolving credit facility. The pro forma interest expense estimate is calculated based on the actual interest rate in effect on the revolving credit facility for each respective period. A portion of the 599 N. Mathilda Avenue, Sunnyvale, CA total purchase price related to development assets acquired. This portion of the purchase price has no pro forma impact as the interest expense related to development would be capitalized and would not impact net income available to common stockholders. Actual funding of the acquisitions may be from different sources and the pro forma borrowings and related pro forma interest expense estimate assumed herein are not indicative of actual results.

Actual results for certain operating data for the property

The following table summarizes the results of operations for the properties at 4100-4700 Bohannon Drive, Menlo Park, CA, 10900 Northeast 4th Street, Bellevue, WA, and 555-599 N. Mathilda Avenue, Sunnyvale, CA, from February 29, 2012, July 24, 2012 and December 17, 2012, the dates of acquisition, respectively, through December 31, 2012:

	(in thousands)
Revenues	$	18,943
Net income(1)	$	3,412

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

The following table summarizes the results of operations for the properties at 601 108th Avenue N.E., Bellevue, WA, and 201 Third Street, San Francisco, CA, from June 3, 2011 and September 15, 2011, the dates of acquisition, respectively, through December 31, 2011:

	(in thousands)
Revenues	$	15,150
Net income(1)	$	397

________________

(1) Reflects the net operating income less depreciation for these properties and amortization of lease related intangibles.

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Stockholders' Equity of the Company (Details Textuals) (USD $)	0 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended		0 Months Ended	12 Months Ended								1 Months Ended
	Apr. 16, 2012	Dec. 31, 2012 Quarters	Dec. 31, 2011	Dec. 31, 2010	Aug. 31, 2012 Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series H Cumulative Redeemable Preferred Stock [Member]	Mar. 31, 2012 Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series G Cumulative Redeemable Preferred Stock [Member]	Apr. 16, 2012 Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series E Cumulative Redeemable Preferred Stock [Member]	Apr. 16, 2012 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series E and Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2010 Common Stock [Member]	Dec. 31, 2012 Issuance of Equity under ATM Program [Member]	Dec. 31, 2011 Issuance of Equity under ATM Program [Member]	Dec. 31, 2012 Issuance of Equity under ATM Program [Member] Common Stock [Member]	Dec. 31, 2011 Issuance of Equity under ATM Program [Member] Common Stock [Member]	Aug. 31, 2012 Issuance of Equity [Member]	Feb. 28, 2012 Issuance of Equity [Member]	Apr. 30, 2011 Issuance of Equity [Member]	Apr. 30, 2010 Issuance of Equity [Member]	Aug. 31, 2012 Issuance of Equity [Member] Common Stock [Member]	Feb. 28, 2012 Issuance of Equity [Member] Common Stock [Member]	Apr. 30, 2011 Issuance of Equity [Member] Common Stock [Member]	Apr. 30, 2010 Issuance of Equity [Member] Common Stock [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate					6.375%	6.375%		6.875%	6.875%		7.80%		7.80%	7.50%		7.50%
Preferred stock issued (in shares)					4,000,000	4,000,000		4,000,000	4,000,000				1,610,000			3,450,000
Liquidation preference (in dollars per share)					$ 25			$ 25	$ 25
Proceeds from issuance of preferred stock		$ 192,411,000			$ 96,200,000			$ 96,200,000
Number of quarters		6
Number of days within a change in control in which preferred stock may be redeemed									120 days
Redeemable preferred stock issued upon conversion, maximum						4,187,600			4,390,000
Preferred stock (in shares)						4,000,000			4,000,000		1,610,000		1,610,000	3,450,000		3,450,000
Redemption price (in dollars per share)											$ 25
Stock Redeemed or Called During Period, Value	126,500,000	126,500,000
Preferred stock redemption premium		6,980,000	0	0													4,900,000
Issuance of common stock, shares																		9,200,000			787,118	355,305					5,750,000	9,487,500	6,037,500	9,200,000
Proceeds from Issuance of Common Stock		672,102,000	233,312,000	299,847,000															36,300,000	12,800,000			253,800,000	382,100,000	221,000,000	299,800,000
At Market Stock Offering Program Aggregate Value Of Common Stock		200,000,000
At Market Stock Offering Program Gross Proceeds																			37,000,000	13,000,000
Common stock issued (in shares)		74,926,981	58,819,717																		1,142,423
At Market Stock Offering Program Remained Available For Issuance		$ 150,000,000
Dividend reinvestment plan, stock issued (in shares)			0
Share Repurchase, remaining number of shares authorized to be repurchased		988,025

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Organization and Ownership (Details)	Dec. 31, 2012 sqft
Summary of stabilized portfolio of operating properties
Rentable square feet	13,249,780	[1]
Office Properties [Member]
Summary of stabilized portfolio of operating properties
Rentable square feet	13,249,780	[1]
Development Properties [Member]
Summary of stabilized portfolio of operating properties
Number of buildings	0
Rentable square feet	1,416,000	[2]
Redevelopment Properties [Member]
Summary of stabilized portfolio of operating properties
Number of buildings	0
Rentable square feet	410,000	[2]
Lease Up Properties [Member]
Summary of stabilized portfolio of operating properties
Number of buildings	1
Rentable square feet	98,000	[2]
Stabilized Portfolio [Member] | Office Properties [Member]
Summary of stabilized portfolio of operating properties
Number of buildings	114
Rentable square feet	13,249,780
Number of Tenants	530
Percentage Occupied	92.80%

[1] Includes square footage from our stabilized portfolio.

[2] Estimated rentable square feet upon completion.

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Segment Disclosure (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 segment		Dec. 31, 2011 segment		Dec. 31, 2010	Dec. 31, 2009
Segment Reporting Information [Line Items]
Number of Reportable Segments	1		1
Number of Non-Reportable Segments			1
Assets:
Land, buildings and improvement, net	$ 3,191,225		$ 2,625,381
Undeveloped land and construction in progress	809,654		430,806
TOTAL ASSETS	4,616,084		3,446,795
Reconciliation to Consolidated Assets:
Total assets allocated to segments	4,616,084		3,446,795
Other unallocated asset:
Cash and cash equivalents	16,700		4,777		14,840	9,883
Restricted cash	247,544		358
Marketable securities	7,435		5,691
Deferred financing costs, net	18,971		18,368
Prepaid expenses and other assets, net	9,949		12,199
TOTAL ASSETS	4,616,084		3,446,795
Operating Segments [Member]
Assets:
TOTAL ASSETS	4,315,485	[1]	3,405,402	[1]
Reconciliation to Consolidated Assets:
Total assets allocated to segments	4,315,485	[1]	3,405,402	[1]
Other unallocated asset:
TOTAL ASSETS	4,315,485	[1]	3,405,402	[1]
Reportable Segment - Office Properties [Member]
Assets:
Land, buildings and improvement, net	3,191,225		2,480,338
Undeveloped land and construction in progress	809,654		430,806
TOTAL ASSETS	4,315,485	[1]	3,248,661	[1]
Reconciliation to Consolidated Assets:
Total assets allocated to segments	4,315,485	[1]	3,248,661	[1]
Other unallocated asset:
TOTAL ASSETS	4,315,485	[1]	3,248,661	[1]
Non-Reportable Segment - Industrial Properties [Member]
Assets:
Land, buildings and improvement, net	0		145,043
TOTAL ASSETS	0	[1]	156,741	[1]
Reconciliation to Consolidated Assets:
Total assets allocated to segments	0	[1]	156,741	[1]
Other unallocated asset:
TOTAL ASSETS	$ 0	[1]	$ 156,741	[1]

[1] Includes land, buildings, and improvements, undeveloped land and construction in progress, real estate assets held for sale, current receivables, deferred rent receivables, deferred leasing costs, and acquisition-related intangible assets, all shown on a net basis.

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Quarterly Financial Information of the Operating Partnership (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Quarterly Financial Information [Table Text Block]

Summarized quarterly financial data for the years ended December 31, 2012 and 2011 was as follows:

	2012 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	92,397		$	97,111		$	104,293		$	111,111
Net Operating Income from continuing operations (2)(3)	67,791			68,437			72,251			79,276
Income (loss) from continuing operations (3)	2,165			36			(665		)	3,911
Income from discontinued operations (3)	76,506			2,241			3,187			189,720
Net income	78,671			2,277			2,522			193,631
Net income attributable to Kilroy Realty Corporation	76,876			2,297			2,589			189,152
Preferred dividends and distributions	(9,336		)	(3,097		)	(5,342		)	(3,313		)
Net income (loss) available to common stockholders	67,540			(800		)	(2,753		)	185,839
Net income (loss) available to common stockholders per share—basic	1.06			(0.02		)	(0.04		)	2.49
Net income (loss) available to common stockholders per share—diluted	1.06			(0.02		)	(0.04		)	2.45
	2011 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per share amounts)
Revenues from continuing operations (3)	$	76,003		$	81,002		$	86,398		$	94,226
Net Operating Income from continuing operations (2)(3)	53,660			56,910			60,268			67,777
Income from continuing operations (3)	750			(1,071		)	(3,391		)	(16		)
Income from discontinued operations (3)	4,117			4,543			17,681			44,876
Net income	4,867			3,472			14,290			44,860
Net income attributable to Kilroy Realty Corporation	4,833			3,482			13,994			43,706
Preferred dividends and distributions	(3,799		)	(3,799		)	(3,799		)	(3,799		)
Net income (loss) available to common stockholders	1,034			(317		)	10,195			39,907
Net income (loss) available to common stockholders per share—basic	0.01			(0.01		)	0.17			0.68
Net income (loss) available to common stockholders per share—diluted	0.01			(0.01		)	0.17			0.68

____________________

(1) The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding.  The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

(2) Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

(3) All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

Kilroy Realty, L.P. [Member]

Schedule of Quarterly Financial Information [Table Text Block]

Summarized quarterly financial data for the years ended December 31, 2012 and 2011 was as follows:

	2012 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per unit amounts)
Revenues from continuing operations (3)	$	92,397		$	97,111		$	104,293		$	111,111
Net Operating Income from continuing operations (2)(3)	67,791			68,437			72,251			79,276
Income (loss) from continuing operations (3)	2,165			36			(665		)	3,911
Income from discontinued operations (3)	76,506			2,241			3,187			189,720
Net income	78,671			2,277			2,522			193,631
Net income attributable to the Operating Partnership	78,618			2,234			2,474			193,137
Preferred distributions	(9,336		)	(3,097		)	(5,342		)	(3,313		)
Net income (loss) available to common unitholders	69,282			(863		)	(2,868		)	189,824
Net income (loss) available to common unitholders per unit—basic	1.05			(0.02		)	(0.04		)	2.48
Net income (loss) available to common unitholders per unit—diluted	1.05			(0.02		)	(0.04		)	2.44
	2011 Quarter Ended (1)
	March 31,			June 30,			September 30,			December 31,
	(in thousands, except per unit amounts)
Revenues from continuing operations (3)	$	76,003		$	81,002		$	86,398		$	94,226
Net Operating Income from continuing operations (2)(3)	53,660			56,910			60,268			67,777
Income from continuing operations (3)	750			(1,071		)	(3,391		)	(16		)
Income from discontinued operations (3)	4,117			4,543			17,681			44,876
Net income	4,867			3,472			14,290			44,860
Net income attributable to the Operating Partnership	4,833			3,440			14,260			44,427
Preferred distributions	(3,799		)	(3,799		)	(3,799		)	(3,799		)
Net income (loss) available to common unitholders	1,034			(359		)	10,461			40,628
Net income (loss) available to common unitholders per unit—basic	0.01			(0.01		)	0.17			0.68
Net income (loss) available to common unitholders per unit—diluted	0.01			(0.01		)	0.17			0.68

___________________

(1) The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding.  The summation of the quarterly net income (loss) available to common unitholders per unit does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

(2) Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

(3) All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

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Share-Based Compensation (Details 2) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	62,137		68,727		3,239
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	$ 41.84		$ 37.83		$ 30.88
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(50,862)		(34,793)		(41,680)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	$ 2,110		$ 1,334		$ 1,398
Nonvested Restricted Stock Units R S U [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	204,829		107,673		159,606
Granted, Weighted Average Grant Date Fair Value (in dollars per share)	$ 44.34		$ 37.94		$ 30.24
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period	(73,688)		(85,466)		(303,146)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	$ 3,118	[1]	$ 3,273	[1]	$ 10,936	[1]

[1] Total fair value of RSUs vested was calculated based on the quoted closing share price of the Company's common stock on the NYSE on the day of vesting.

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Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Kilroy Realty, L.P. [Member])

12 Months Ended

Dec. 31, 2012

Kilroy Realty, L.P. [Member]

Net Income Available To Common Unitholders [Line Items]

Net Income Available to Common Unitholders per Unit of the Operating Partnership

Net Income Available to Common Unitholders Per Unit of the Operating Partnership

The following table reconciles the numerator and denominator in computing the Operating Partnership's basic and diluted per-unit computations for net income available to common unitholders for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012			2011			2010
	(in thousands, except unit and per unit amounts)
Numerator:
Income (loss) from continuing operations	$	5,447		$	(3,728	)	$	(427	)
Income from continuing operations attributable to noncontrolling interests in consolidated subsidiaries	(174		)	(529		)	(162		)
Preferred distributions	(21,088		)	(15,196		)	(15,196		)
Allocation to participating securities (nonvested units and time-based RSUs)	(1,602		)	(1,309		)	(1,151		)
Numerator for basic and diluted loss from continuing operations available to common unitholders	(17,417		)	(20,762		)	(16,936		)
Income from discontinued operations	271,654			71,217			20,313
Income from discontinued operations attributable to noncontrolling interests in consolidated subsidiaries	(464		)	—			—
Numerator for basic and diluted net income available to common unitholders	$	253,773		$	50,455		$	3,377
Denominator:
Basic weighted average vested units outstanding	71,403,258			58,437,444			51,220,618
Effect of dilutive securities-contingently issuable shares and stock options	—			—			—
Diluted weighted average vested units and common unit equivalents outstanding	71,403,258			58,437,444			51,220,618
Basic earnings per unit:
Loss from continuing operations available to common unitholders per unit	$	(0.24	)	$	(0.36	)	$	(0.33	)
Income from discontinued operations per common unit	3.80			1.22			0.40
Net income available to common unitholders per unit	$	3.56		$	0.86		$	0.07
Diluted earnings per unit:
Loss from continuing operations available to common unitholders per unit	$	(0.24	)	$	(0.36	)	$	(0.33	)
Income from discontinued operations per common unit	3.80			1.22			0.40
Net income available to common unitholders per unit	$	3.56		$	0.86		$	0.07

The impact of the contingently issuable units, which consist of the 88,490 market measure-based RSUs, the Exchangeable Notes, and the 1,540,000 stock options, were not considered in our diluted earnings per unit calculation for the year ended December 31, 2012 because the Operating Partnership reported a loss from continuing operations attributable to common unitholders and the effect was anti-dilutive. The impact of stock options and the Exchangeable Notes during the years ended December 31, 2011 and 2010, were not considered in our diluted earnings per unit calculation for the years ended December 31, 2011 and 2010 because we reported a loss from continuing operations attributable to common unitholders and the effect was anti-dilutive. See Note 7 for additional information regarding the Exchangeable Notes and Note 12 for additional information regarding the outstanding stock options and market measure-based RSUs.

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Stockholders' Equity of the Company Stockholders' Equity of the Company (Tables)

12 Months Ended

Dec. 31, 2012

Equity [Abstract]

Schedule of Dividends Payable [Table Text Block]

The following tables summarize accrued dividends and distributions for the noted outstanding shares of common stock, preferred stock, and noncontrolling units as of December 31, 2012 and 2011:

	December 31,
	2012		2011
	(in thousands)
Dividends and Distributions payable to:
Common stockholders	$	26,224	$	20,587
Noncontrolling common unitholders of the Operating Partnership	639		601
RSU holders (1)	367		295
Total accrued dividends and distribution to common stockholders and noncontrolling unitholders	27,230		21,483
Preferred stockholders	1,694		1,209
Total accrued dividends and distributions	$	28,924	$	22,692

______________________

(1) The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12)

Schedule of Stock by Class [Table Text Block]

	December 31,
	2012	2011
Outstanding Shares and Units:
Common stock (1)	74,926,981	58,819,717
Noncontrolling common units	1,826,503	1,718,131
RSUs (2)	1,048,863	842,675
Series E Preferred stock		1,610,000
Series F Preferred stock		3,450,000
Series G Preferred stock	4,000,000
Series H Preferred stock	4,000,000

______________________

(1) The amount includes nonvested shares.

(2) The amount includes nonvested RSUs.

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Secured and Unsecured Debt of the Operating Partnership

12 Months Ended

Dec. 31, 2012

Debt Instrument [Line Items]

Secured and Unsecured Debt of the Operating Partnership

Secured and Unsecured Debt of the Company

In this Note 6, the "Company" refers solely to Kilroy Realty Corporation and not to any of our subsidiaries. The Company itself does not hold any indebtedness. All of our secured and unsecured debt is held directly by the Operating Partnership.

The Company generally guarantees all the Operating Partnership's unsecured debt obligations including the unsecured revolving credit facility, the $150.0 million unsecured term loan facility, 6.625% unsecured senior notes due 2020, the 4.80% unsecured senior notes due 2018, the 5.00% unsecured senior notes due 2015, the 6.45% unsecured senior notes due 2014, and the 4.25% Exchangeable Notes. As of both December 31, 2012 and 2011, the Operating Partnership had $1.5 billion outstanding in total under these unsecured debt obligations.

In addition, although the remaining $0.6 billion and $0.4 billion of the Operating Partnership's debt for December 31, 2012 and 2011, respectively, is secured and non-recourse to the Company, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities.

The Company and the Operating Partnership are both named parties to the capped call option transactions discussed further in Note 7.

Debt Covenants and Restrictions

One of the covenants contained within the credit facility and the term loan facility, as discussed further below in Note 7 prohibits the Company from paying dividends in excess of 95% of funds from operations ("FFO").

Kilroy Realty, L.P. [Member]

Debt Instrument [Line Items]

Secured and Unsecured Debt of the Operating Partnership

Secured and Unsecured Debt of the Operating Partnership

Secured Debt

The following table sets forth the composition of our secured debt as of December 31, 2012 and 2011:

	Annual Stated	GAAP		December 31,
Type of Debt	Interest Rate (1)	Effective Rate (1)(2)	Maturity Date	2012 (11)		2011 (11)
				(in thousands)
Mortgage note payable	4.27%	4.27%	February 2018	$	135,000	$	135,000
Mortgage note payable (3)(9)	4.48%	4.48%	July 2027	97,000		—
Mortgage note payable (4)(9)	6.37%	3.55%	April 2013	83,116		—
Mortgage note payable (5)	5.57%	5.57%	August 2012	—		71,517
Mortgage note payable	6.51%	6.51%	February 2017	68,615		69,507
Mortgage note payable (6)(9)	5.23%	3.50%	January 2016	56,302		—
Mortgage note payable (7)(9)	5.57%	3.25%	February 2016	43,016		—
Mortgage note payable (8)(9)	5.09%	3.50%	August 2015	35,379		—
Mortgage note payable (9)	4.94%	4.00%	April 2015	28,941		30,191
Mortgage note payable (5)	4.95%	4.95%	August 2012	—		29,754
Mortgage note payable	7.15%	7.15%	May 2017	11,210		13,294
Public facility bonds (10)	Various	Various	Various	2,517		2,562
Total				$	561,096	$	351,825

_______________________

(1) All interest rates presented are fixed-rate interest rates.

(2) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of discounts/premiums, excluding debt issuance costs.

(3) In June 2012, we obtained a mortgage loan that is secured by one office property located in Irvine, California and two office properties located in Los Angeles, California and requires monthly principal and interest payments based on a 30 year amortization period with an initial 3 years of interest only payments.

(4) In July 2012, in connection with the acquisition of one office building in Bellevue, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $83.6 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $1.4 million. The loan requires monthly principal and interest payments based on a 30 year amortization period. In January 2013, we repaid this loan prior to the stated maturity.

(5) In May 2012, we repaid these loans prior to the stated maturity.

(6) In July 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage had a principal balance of $53.9 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $3.1 million. The loan requires monthly principal and interest payments based on a 30 year amortization period.

(7) In October 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $40.7 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium of

approximately $2.7 million.

(8) In June 2012, in connection with the acquisition of two office buildings in Seattle, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $34.0 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium of

approximately $1.7 million.

(9) The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.

(10) The public facility bonds (the “Bonds”), the proceeds from which were used to finance infrastructure improvements on one of the Company’s undeveloped land parcels, were issued in February 2008 by the City of Carlsbad. The Bonds have annual maturities from September 1, 2013 through September 1, 2038, with interest rates ranging from 4.74% to 6.20%. Principal and interest payments for the Bonds will be charged through the assessment of special property taxes.

(11) Amounts reported include the amounts of unamortized debt premiums and discounts for the periods presented.

The Operating Partnership’s secured debt was collateralized by 20 operating properties as of December 31, 2012 with a combined net book value of $1.0 billion and 18 operating properties at December 31, 2011 with a combined net book value of $567.8 million.

Although our mortgage loans are secured and non-recourse to the Company and the Operating Partnership, the Company

provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments,

and environmental liabilities.

As of December 31, 2012, nine of the Operating Partnership's ten secured loans contained restrictions that would require the payment of prepayment penalties for the acceleration of outstanding debt. The mortgage notes payable are secured by deeds of trust on certain of our properties and the assignment of certain rents and leases associated with those properties. The Bonds are secured by property tax payments.

Exchangeable Senior Notes

The following table summarizes the balance and significant terms of the Company's 3.25% Exchangeable Notes due April 2012 (the "3.25% Exchangeable Notes") and 4.25% Exchangeable Notes due November 2014 (the "4.25% Exchangeable Notes" and together with the 3.25% Exchangeable Notes, the "Exchangeable Notes") outstanding as of December 31, 2012 and 2011. The Company repaid the 3.25% Exchangeable Notes in April 2012 upon maturity.

	3.25% Exchangeable Notes					4.25% Exchangeable Notes
	December 31, 2012		December 31, 2011			December 31, 2012			December 31, 2011
	(in thousands)
Principal amount	$	—	$	148,000		$	172,500		$	172,500
Unamortized discount	—		(924		)	(8,556		)	(12,684		)
Net carrying amount of liability component	$	—	$	147,076		$	163,944		$	159,816
Carrying amount of equity component			$33,675			$19,835
Issuance date			April 2007			November 2009
Maturity date			April 2012			November 2014
Stated coupon rate (1)			3.25%			4.25%
Effective interest rate (2)			5.45%			7.13%
Exchange rate per $1,000 principal value of the Exchangeable Notes, as adjusted (3)						27.8307
Exchange price, as adjusted (3)						$35.93
Number of shares on which the aggregate consideration to be delivered on conversion is determined (3)						4,800,796

_______________

(1) Interest on the 4.25% Exchangeable Notes is payable semi-annually in arrears on May 15th and November 15th of each year.

(2) The rate at which we record interest expense for financial reporting purposes, which reflects the amortization of the discounts on the Exchangeable Notes (see Note 2). This rate represents our conventional debt borrowing rate at the date of issuance.

(3) The exchange rate, exchange price, and the number of shares to be delivered upon conversion are subject to adjustment under certain circumstances including increases in our common dividends.  

The 4.25% Exchangeable Notes are exchangeable for shares of the Company’s common stock prior to maturity only upon the occurrence of certain events as follows: (i) during any calendar quarter, if the closing sale price per share of the common stock of the Company is more than 130% of the exchange price per share of the Company’s common stock for at least 20 trading days in a specified period, (ii) during the five consecutive trading-day period following any five consecutive trading days in which the trading price per $1,000 principal amount of the Exchangeable Notes was less than 98% of the product of the closing sale price per share of the Company’s common stock multiplied by the applicable exchange rate, (iii) if the Exchangeable Notes have been called for redemption, (iv) upon the occurrence of specified corporate transactions, (v) if the Company’s common stock ceases to be listed or approved for quotation for 30 consecutive trading days, or (vi) on or after August 15, 2014.

Upon exchange, the holders of the 4.25% Exchangeable Notes will receive (i) cash up to the principal amount of the Exchangeable Notes and (ii) to the extent the exchange value exceeds the principal amount of the 4.25% Exchangeable Notes, shares of the Company’s common stock. At any time prior to August 15, 2014, the Operating Partnership may irrevocably elect, in its sole discretion without the consent of the holders of the 4.25% Exchangeable Notes, to settle all of the future exchange obligations of the 4.25% Exchangeable Notes in shares of common stock. Any shares of common stock delivered for settlement will be based on a daily exchange value calculated on a proportionate basis for each day of a 30 trading-day observation period.

During the third quarter of 2012, the closing sale price per share of the common stock of the Company was more than 130% of the exchange price per share of the Company’s common stock for at least 20 trading days in the specified period. As a result, for the three months ended December 31, 2012, the 4.25% Exchangeable Notes were exchangeable at the exchange rate stated above, however no holders exchanged any of the 4.25% Exchangeable Notes during this period. The 4.25% Exchangeable notes may again be exchangeable if one or more of the events were again to occur during future measurement periods.

For the years ended December 31, 2012 and December 31, 2011, the per share average trading price of the Company's common stock on the NYSE was higher than the $35.93 exchange price for the 4.25% Exchangeable Notes, as presented below:

	Year Ended December 31,
	2012	2011
Per share average trading price of the Company's common stock	$45.72	$37.27

The average trading price of the Company's common stock on the NYSE was below the exchange price for the 4.25% Exchangeable Notes during year ended December 31, 2010 and below the exchange price for the 3.25% Exchangeable Notes, which were repaid in April 2012, during the years ended December 31, 2011 and 2010. See Notes 19 and 20 for a discussion of the impact of the Exchangeable Notes on our diluted earnings per share and unit calculations for the periods presented.

Using the per share average trading price presented in the table above, the approximate fair value of the shares upon conversion of the 4.25% Exchangeable Notes as of December 31, 2012 and December 31, 2011 would have been as follows:

	December 31, 2012 (1)		December 31, 2011 (2)
	(in thousands)
Approximate fair value of shares upon conversion	$	221,200	$	179,100
Principal amount of 4.25% Exchangeable Notes	172,500		172,500
Approximate fair value in excess amount of principal amount	$	48,700	$	6,600

_______________

(1) Although the 4.25% Exchangeable Notes were exchangeable during the three months ended December 31, 2012, no 4.25% Exchangeable Notes were exchanged during the period. The 4.25% Exchangeable Notes were not exchangeable during the remainder of the year.

(2) The 4.25% Exchangeable Notes were not exchangeable during the year ended December 31, 2011.

Exchangeable Note Tender Offer and Note Repurchases

In June 2010, we repurchased 3.25% Exchangeable Notes with an aggregate stated principal amount of $150.0 million for approximately $151.1 million in cash, including transaction costs, pursuant to a tender offer. As a result of the transaction, we recorded a net loss on early extinguishment of debt of approximately $4.6 million and charged approximately $2.7 million, representing the amount of the cash repurchase proceeds allocated to the equity component, to additional paid-in capital.

Interest Expense for the Exchangeable Notes

The unamortized discount on the Exchangeable Notes is accreted as additional interest expense from the date of issuance through the maturity date of the applicable Exchangeable Notes. The following table summarizes the total interest expense attributable to the Exchangeable Notes based on the effective interest rates set forth above, before the effect of capitalized interest, for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Contractual interest payments	$	8,721	$	12,141	$	14,565
Amortization of discount	5,052		6,928		7,965
Interest expense attributable to Exchangeable Notes	$	13,773	$	19,069	$	22,530

Capped Call Transactions

In connection with the offerings of the Exchangeable Notes, we entered into capped call option transactions ("capped calls") to mitigate the dilutive impact of the potential conversion of the Exchangeable Notes. The capped calls, as amended, are separate transactions entered into by us with the relevant financial institutions, are not part of the terms of the Exchangeable Notes, and do not affect the holders’ rights under the Exchangeable Notes. The strike prices of the capped calls, which are subject to customary anti-dilution adjustments, correspond to the exchange prices of the applicable Exchangeable Notes.

The capped calls for the 3.25% Exchangeable Notes, which referenced a total of 1,121,201 shares of common stock with an exchange price of $102.72 at December 31, 2011, were terminated when the 3.25% Exchangeable Notes were repaid in April 2012. The table below summarizes our capped call option positions for the 4.25% Exchangeable Notes as of both December 31, 2012 and 2011:

	4.25% Exchangeable Notes (1)
Referenced shares of common stock	4,800,796
Exchange price including effect of capped calls	$42.81

________________________

(1) The capped calls mitigate the dilutive impact to us of the potential exchange of all of the 4.25% Exchangeable Notes into shares of common stock.

The capped calls are expected to terminate upon the earlier of the maturity date of the 4.25% Exchangeable Notes or upon the date upon which the 4.25% Exchangeable Notes are no longer outstanding resulting from an exchange or repurchase by us. The initial cost of capped calls were recorded as a reduction to additional paid-in capital.

Unsecured Senior Notes

The following table summarizes the balance and significant terms of the registered unsecured senior notes issued by the Operating Partnership as of December 31, 2012 and 2011:

	4.800% Unsecured Senior Notes						6.625% Unsecured Senior Notes						5.000% Unsecured Senior Notes
	December 31, 2012			December 31, 2011			December 31, 2012			December 31, 2011			December 31, 2012			December 31, 2011
	(in thousands)
Principal amount	$	325,000		$	325,000		$	250,000		$	250,000		$	325,000		$	325,000
Unamortized discount	(413		)	(486		)	(1,580		)	(1,793		)	(112		)	(152		)
Net carrying amount	$	324,587		$	324,514		$	248,420		$	248,207		$	324,888		$	324,848
Issuance date	July 2011						May 2010						November 2010
Maturity date	July 2018						June 2020						November 2015
Stated coupon rate (1)(2)(3)	4.800%						6.625%						5.000%
Effective interest rate (4)	4.827%						6.743%						5.014%

________________________

(1) Interest on the 4.800% unsecured senior notes is payable semi-annually in arrears on January 15th and July 15th of each year.

(2) Interest on the 6.625% unsecured senior notes is payable semi-annually in arrears on June 1st and December 1st of each year.

(3) Interest on the 5.000% unsecured senior notes is payable semi-annually in arrears on May 3rd and November 3rd of each year.

(4) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of initial issuance discounts, excluding debt issuance costs.

In 2011, we used a portion of the net proceeds from the 4.800% unsecured senior note offering for general corporate purposes, including the repayment of borrowings under our revolving credit facility and to fund operating property acquisitions. In 2010, we used the net proceeds from the 6.625% and 5.000% unsecured senior note offerings to fund operating property acquisitions and to repurchase $150.0 million in aggregate principal balance of the 3.25% Exchangeable Notes.

In addition to the registered unsecured senior note issuances listed above, we also had outstanding Series B unsecured senior notes with an aggregate principal balance of $83.0 million and effective interest rate of 6.45% as of December 31, 2012 and 2011, that mature in August 2014. The Series B notes require semi-annual interest payment each February and August based on a fixed annual interest rate of 6.45%.

Term Loan Facility

In March 2012, the Operating Partnership entered into a $150.0 million term loan facility, which is included in unsecured debt, net on our consolidated balance sheets. The term loan facility bears interest at an annual rate of LIBOR plus 1.750%, which can vary depending on the Operating Partnership's credit rating, and is scheduled to mature on March 29, 2016. Under the terms of the term loan facility, we may exercise an option to extend the maturity date by one year. We may elect to borrow up to an additional $100.0 million under an accordion option, subject to bank approval. We used the borrowings under the term loan facility to repay the 3.25% Exchangeable Notes in April 2012 upon maturity.

Unsecured Revolving Credit Facility

In August 2010 we entered into our current $500.0 million revolving credit facility and used the borrowings under the revolving credit facility to repay and then terminate our prior $550.0 million unsecured revolving credit facility. In March 2012, we amended the revolving credit facility to reduce the FMV Cap Rate (as defined in the revolving credit facility agreement), which is used to calculate the fair value of our assets for certain covenants under the revolving credit facility, from 7.50% to 6.75%. There were no other changes to the terms of the revolving credit facility in connection with this amendment. In November 2012 and June 2011, we amended and restated our revolving credit facility to extend the maturity date and reduce the interest rate and facility fee. The following table summarizes the terms of our revolving credit facility as of December 31, 2012 and December 31, 2011:

	December 31, 2012			December 31, 2011
	(in thousands)
Outstanding borrowings	$	185,000		$	182,000
Remaining borrowing capacity	315,000			318,000
Total borrowing capacity (1)	$	500,000		$	500,000
Interest rate (2)	1.66		%	2.05		%
Facility fee-annual rate (3)	0.300		%	0.350		%
Maturity date (4)	April 2017			August 2015

_______________________

(1) We may elect to borrow, subject to bank approval, up to an additional $200.0 million under an accordion feature under the terms of the revolving credit facility.

(2) The revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.450% and 1.750% as of December 31, 2012 and December 31, 2011, respectively.

(3) The facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we also incurred debt origination and legal costs of approximately $5.0 million when we entered into the revolving credit facility in 2010, an additional $3.3 million when we amended the terms of the revolving credit facility in June 2011 and an additional $1.9 million when we amended the terms of the revolving credit facility in November 2012. The unamortized balance of these costs are amortized through the extended maturity date of the revolving credit facility.

(4) Under the original and all amended terms of the revolving credit facility, we may exercise an option to extend the maturity date by one year.

The Company intends to borrow amounts under the revolving credit facility from time to time for general corporate purposes, to fund potential acquisitions, to finance development and redevelopment expenditures, and to potentially repay long-term debt.

Debt Covenants and Restrictions

The revolving credit facility, the unsecured senior notes, the term loan facility, and certain other secured debt arrangements contain covenants and restrictions requiring us to meet certain financial ratios and reporting requirements. Some of the more restrictive financial covenants include a maximum ratio of total debt to total asset value, a minimum fixed-charge coverage ratio, a minimum unsecured debt ratio, and a minimum unencumbered asset pool debt service coverage ratio. Noncompliance with one or more of the covenants and restrictions could result in the full or partial principal balance of the associated debt becoming immediately due and payable. We believe we were in compliance with all of our debt covenants as of December 31, 2012 and 2011.

Debt Maturities

The following table summarizes the stated debt maturities and scheduled amortization payments, excluding debt discounts and premiums, as of December 31, 2012:

Year Ending	(in thousands)
2013	$	90,881
2014	263,913
2015	393,711
2016	247,822
2017	255,036
Thereafter	793,056
Total	$	2,044,419	(1)

_______________________

(1) Includes gross principal balance of outstanding debt before impact of all debt discounts and premiums.

Capitalized Interest and Loan Fees

The following table sets forth our gross interest expense reported in continuing operations, including debt discount/premium and loan cost amortization, net of capitalized interest, for the years ended December 31, 2012, 2011 and 2010. The interest expense capitalized was recorded as a cost of development and redevelopment, and increased the carrying value of undeveloped land and construction in progress. (See Note 17 for interest expense reported in discontinued operations).

	Year Ended December 31,
	2012			2011			2010 (1)
	(in thousands)
Gross interest expense	$	98,906		$	94,915		$	69,661
Capitalized interest	(19,792		)	(9,130		)	(10,015		)
Interest expense	$	79,114		$	85,785		$	59,646

_______________________

(1) Interest expense for the year ended December 31, 2010 includes loss on extinguishment of debt.

XML

Schedule III - Real Estate and Accumulated Depreciation (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Real Estate and Accumulated Depreciation [Line Items]
Total real estate held for investment, beginning of year	$ 3,798,690		$ 3,216,871		$ 2,520,083
Acquisitions	1,023,384		617,923		643,776
Improvements, etc.	207,345		84,736		86,754
Total additions during period	1,230,729		702,659		730,530
Cost of real estate sold	(264,533)		(21,052)		(17,456)
Properties held for sale	0		(89,937)		0
Other	(7,492)	[1]	(9,851)	[1]	(16,286)	[1]
Total deductions during period	(272,025)		(120,840)		(33,742)
Total real estate held for investment, end of year	$ 4,757,394		$ 3,798,690		$ 3,216,871

[1] Related to the redevelopment property transferred to construction in progress during the year.

XML

Share-Based Compensation

12 Months Ended

Dec. 31, 2012

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation

Share-Based Compensation

Stockholder Approved Equity Compensation Plans

We establish share-based incentive compensation plans for the purpose of attracting and retaining officers, key employees, and non-employee board members. As of December 31, 2012, we had one share-based incentive compensation plan, the Kilroy Realty 2006 Incentive Award Plan as amended (the “2006 Plan”), which was adopted by our board of directors and approved by our stockholders.

As of December 31, 2012, 639,487 shares were available for grant under the 2006 Plan. The number of shares that remains available for grant is calculated using the weighted share counting provisions set forth in the 2006 Plan, which are based on the type of awards that are granted. The maximum number of shares available for grant subject to full value awards (which generally include equity awards other than options and stock appreciation rights) was 219,002 shares as of December 31, 2012.

The Executive Compensation Committee, which is comprised of four independent directors, may grant the following share-based awards as provided under the 2006 Plan: incentive stock options, nonqualified stock options, restricted stock (nonvested shares), stock appreciation rights, performance shares, performance stock units, dividend equivalents, stock payments, deferred stock, RSUs, profit interest units, performance bonus awards, performance-based awards, and other incentive awards to eligible individuals. For each award granted under our share-based incentive compensation programs, the Operating Partnership simultaneously issues to the Company a number of common units equal to the number of shares of common stock ultimately paid by the Company in respect of such awards.

All of our outstanding share-based awards issued prior to 2007 were issued under the 1997 Stock Option and Incentive Plan (the “1997 Plan”), which was terminated by our board of directors in September 2006. Any awards that were outstanding upon the termination of the 1997 Plan continued in effect in accordance with the terms of such plan and the applicable award agreement following termination of the 1997 Plan.

Stock Award Deferral Program

We have a Stock Award Deferral Program (the “RSU Program”) under the 2006 Plan. Under the RSU Program, participants may defer receipt of awards of nonvested shares that may be granted by electing to receive an equivalent number of RSUs in lieu of nonvested shares. Each RSU represents the right to receive one share of our common stock in the future and is subject to the same vesting conditions that would have applied if the award had been issued in nonvested shares. RSUs carry with them the right to receive dividend equivalents such that participants receive additional, fully-vested RSUs at the time dividends are paid equal to the value of the dividend paid on the shares underlying participant RSUs. Shares issued in settlement of vested RSUs including RSUs paid on dividend equivalents will be distributed in a single lump sum distribution upon the earlier of (1) the date specified by the participant when the election is made, which may be no earlier than two years after the start of the calendar year to which the election applies, or (2) upon other certain events specified under the RSU program.

Share-Based Compensation Programs

The Executive Compensation Committee has historically awarded nonvested shares and RSUs under the following share-based compensation programs. These share-based awards were valued based on the quoted closing share price of the Company’s common stock on the NYSE on the applicable grant date. Dividends are paid on all outstanding shares and RSUs whether vested or nonvested and are not forfeitable if the underlying shares or RSUs ultimately do not vest.

Executive Officer Share-Based Compensation Programs

The Executive Compensation Committee has annually approved compensation programs that include the potential issuance of share-based awards to our Chief Executive Officer, Chief Operating Officer, Chief Investment Officer and Chief Financial Officer (“the Executive Officers”) as part of their annual and long-term incentive compensation. Incentive compensation for our executive officers for 2011 and 2012 was structured to allow the Executive Compensation Committee to evaluate a variety of key factors and metrics at the end of the year and make a determination of share-based incentive compensation for executive officers based on the Company's and management's overall performance. In years prior to 2011, the number of nonvested shares or nonvested RSUs issued has been contingent upon specific corporate performance and market conditions. The share-based awards are generally issued in the first quarter after the end of our prior fiscal year. The share-based awards generally have a service vesting period, which has historically ranged from one to five years, depending on the type of award.

Key Employee Share-Based Compensation Program

The Executive Compensation Committee has historically awarded nonvested shares or nonvested RSUs to other key employees on an annual basis as part of their long-term incentive compensation. The share-based awards are generally issued in the first quarter, and the individual share awards generally vest in equal annual installments over the applicable service vesting period, which has historically ranged from two to five years.

Non-employee Board Members Share-Based Compensation Program

The Board of Directors awards nonvested shares or nonvested RSUs to non-employee board members on an annual basis as part of such board members’ annual compensation and to newly elected non-employee board members in accordance with our board of directors compensation program. The share-based awards are generally issued in the second quarter, and the individual share awards vest in equal annual installments over the applicable service vesting period, which will be one year.

Summary of 2012 CEO RSU Awards

On March 30, 2012, the Executive Compensation Committee of the Company's Board of Directors granted 206,477 restricted stock units ("RSUs") to the Company's Chief Executive Officer. Fifty-percent of the RSUs granted will vest in seven equal annual installments beginning on December 31, 2012 through December 31, 2018, subject to continued employment through the applicable vesting date. The grant date fair value of these time-based RSUs was $4.8 million, which was based on the $46.61 closing share price of the Company's common stock on the New York Stock Exchange on the grant date. Compensation expense will be recognized on a straight-line basis over the service vesting period for these time-based RSUs. The remaining 50% of the RSUs granted will vest in seven equal annual installments for each calendar year during 2012 through 2018 based on the achievement of certain absolute or relative total shareholder return goals measured annually or, if neither of the shareholder return hurdles are achieved for an applicable year during the performance period, those RSUs will remain eligible to vest in a subsequent year (ending in 2018) based on the achievement of a cumulative total shareholder return goal, as well as (in each case) continued employment through the applicable vesting date. The grant date fair value of these market measure-based RSUs was $4.3 million and was calculated using a Monte Carlo simulation pricing model based on the assumptions in the table below. The grant date fair value is allocated among each of the seven annual vesting tranches for these market measure-based RSUs and compensation expense will be recognized over the service vesting period using the accelerated expense attribution method.

	March 2012 Market Measure-based RSU Grant
Grant date fair value per share	$41.20
Expected share price volatility	31.00%
Risk-free interest rate	1.60%
Dividend yield	3.80%
Expected life	7 years

The computation of expected volatility is based on a blend of the historical volatility of our shares of common stock over 14 years as that is expected to be most consistent with future volatility and equates to a time period twice as long as the seven-year term of the RSUs and implied volatility data based on the observed pricing of six-month publicly-traded options on our shares of common stock. The risk-free interest rate is based on the yield curve on zero-coupon U.S. Treasury STRIP securities in effect at the grant date. The expected dividend yield is estimated by examining the average of the historical dividend yield levels over the seven-year term of the RSUs and our current annualized dividend yield as of the grant date. The expected life of the RSUs is equal to the seven-year vesting period.

As of December 31, 2012, the first tranche of 14,748 market-measure based RSUs was earned and distributed to the Chief Executive Officer, with 6,883 shares tendered for taxes.

Summary of Time-Based RSUs

A summary of our time-based RSU activity from January 1, 2012 through December 31, 2012 is presented below:

	Nonvested RSUs
Nonvested and Vested Restricted Stock Units	Amount		Weighted-Average Grant Date Fair Value		Vested RSUs		Total RSUs
Outstanding at January 1, 2012	147,961		$	32.18	694,714		842,675
Granted (1)	204,829		44.34		—		204,829
Vested	(73,688	)	38.91		73,688		—
Settled (2)					(19,955	)	(19,955	)
Issuance of dividend equivalents (3)					28,368		28,368
Canceled (2) (4)					(7,054	)	(7,054	)
Outstanding as of December 31, 2012	279,102		$	41.30	769,761		1,048,863

 _______________________

(1) Includes 103,239 RSUs issued to the Company's Chief Executive Officer, as described above.

(2) In August 2012 and December 2012, certain vested RSUs were settled in shares of the Company's common stock.

(3) RSUs issued as dividend equivalents are vested upon issuance.

(4) We accept the return of RSUs, at the current quoted market price of the Company's common stock, to satisfy minimum statutory tax-withholding requirements related to either RSUs that have vested or RSU dividend equivalents in accordance with the terms of the 2006 Plan.

A summary of our time-based RSU activity for the years ended December 31, 2012, 2011, and 2010 is presented below:

	RSUs Granted			RSUs Vested
Year Ended	Non-Vested RSUs Issued	Weighted- Average Grant-Date Fair Value		Vested RSUs		Total Vest-Date Fair Value (1)         (in thousands)
2012	204,829	$	44.34	(73,688	)	$	3,118
2011	107,673	37.94		(85,466	)	3,273
2010	159,606	30.24		(303,146	)	10,936

________________________

(1) Total fair value of RSUs vested was calculated based on the quoted closing share price of the Company's common stock on the NYSE on the day of vesting.

Summary of Nonvested Shares

A summary of our nonvested shares activity from January 1, 2012 through December 31, 2012 is presented below:

Nonvested Shares	Shares		Weighted-Average Grant-Date Fair Value
Outstanding at January 1, 2012	83,966		$	39.83
Granted	62,137		41.84
Vested (1)	(50,862	)	41.29
Outstanding as of December 31, 2012	95,241		$	40.42

_______________

(1) The total shares vested include 18,766 of shares that were then tendered to satisfy minimum statutory tax withholding requirements related to the restricted shares that have vested in accordance with the terms of the 2006 Plan. We accept the return of shares at the current quoted market price of the Company's common stock to satisfy tax obligations.

A summary of our nonvested and vested shares activity for the years ended December 31, 2012, 2011, and 2010 is presented below:

	Shares Granted			Shares Vested
Year Ended	Non-Vested Shares Issued	Weighted- Average Grant-Date Fair Value		Vested Shares		Total Vest-Date Fair Value (1)          (in thousands)
2012	62,137	$	41.84	(50,862	)	$	2,110
2011	68,727	37.83		(34,793	)	1,334
2010	3,239	30.88		(41,680	)	1,398

_______________________

(1) Total fair value of shares vested was calculated based on the quoted closing share price of the Company's common stock on the NYSE on the day of vesting.

Summary of Stock Options

On February 22, 2012, the Executive Compensation Committee of the Company granted non-qualified stock options to certain key members of our senior management team, including our executive officers, to purchase an aggregate 1,550,000 shares of the Company's common stock at an exercise price per share equal to $42.61, the closing price of the Company's common stock on the grant date. The options will vest ratably in annual installments over a five-year period, subject to continued employment through the applicable vesting date. The term of each option is ten years from the date of the grant. Dividends will not be paid on vested or unvested options. The options were granted pursuant to the 2006 Plan.

The fair value of each stock option granted is estimated on the date of grant using the Black-Scholes option pricing model based on the following assumptions for the February 2012 grant.

	February 2012 Option Grant
Fair value of options granted per share	$9.20
Expected stock price volatility	33.00%
Risk-free interest rate	1.35%
Dividend yield	3.80%
Expected life of option	6.5 years

The computation of expected volatility is based on a blend of the historical volatility of our shares of common stock over a time period longer than the expected life of the option and implied volatility data based on the observed pricing of six-month publicly traded options on our shares of common stock. The risk-free interest rate is based on the yield curve on zero-coupon U.S. Treasury STRIP securities in effect at the grant date. The expected dividend yield is estimated by examining the average of the historical dividend yield levels over the expected life of the option and the current dividend yield as of the grant date. The expected life of the options is calculated as the average of the vesting term and the contractual term.

A summary of our stock option activity from January 1, 2012 through December 31, 2012 is presented below:

	Number of Options		Exercise Price	Remaining Contractual Term (years)
Outstanding at January 1, 2012 (1)	5,000		$25.77
Granted	1,550,000		42.61
Exercised (1)	(5,000	)	25.77
Forfeited	(10,000	)	42.61
Outstanding at December 31, 2012 (2)(3)	1,540,000		$42.61	9.2

________________________

(1) Stock options outstanding as of December 31, 2011 were granted in 2002 and exercised in 2012 prior to expiration. No stock options were granted during 2003 through 2011.

(2) As of December 31, 2012, none of the outstanding stock options were exercisable.

(3) The total intrinsic value of options outstanding at December 31, 2012 was $7.3 million.

Share-based Compensation Cost Recorded During the Period

The total compensation cost for all share-based compensation programs was $8.5 million, $5.6 million, and $7.4 million for the years ended December 31, 2012, 2011, and 2010, respectively. Included in the total $7.4 million of compensation cost for the year ended December 31, 2010 was the reversal of approximately $1.1 million of cumulative compensation expense previously recorded during the years 2007 through 2010 for the 2007 Development Performance Plan, because the performance targets for this program were not ultimately achieved. Of the total share-based compensation cost, $0.9 million, $1.1 million, and $1.4 million was capitalized as part of real estate assets for the years ended December 31, 2012, 2011, and 2010, respectively. As of December 31, 2012, there was approximately $25.9 million of total unrecognized compensation cost related to nonvested incentive awards granted under share-based compensation arrangements that is expected to be recognized over a weighted-average period of 2.6 years. The remaining compensation cost related to these nonvested incentive awards had been recognized in periods prior to December 31, 2012. The $25.9 million of unrecognized compensation cost does not reflect the potential future compensation related to share-based awards that were granted subsequent to December 31, 2012.

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Future Minimum Rent (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012
Future contractual minimum rent under operating lease
2013	$ 360,592
2014	346,840
2015	306,262
2016	273,241
2017	230,299
Thereafter	641,268
Total	$ 2,158,502

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Secured and Unsecured Debt of the Operating Partnership (Tables) (Kilroy Realty, L.P. [Member])

12 Months Ended

Dec. 31, 2012

Debt Instrument [Line Items]

Exchangeable Notes If-Converted Value

For the years ended December 31, 2012 and December 31, 2011, the per share average trading price of the Company's common stock on the NYSE was higher than the $35.93 exchange price for the 4.25% Exchangeable Notes, as presented below:

	Year Ended December 31,
	2012	2011
Per share average trading price of the Company's common stock	$45.72	$37.27

Approximate fair value of shares upon conversion

Using the per share average trading price presented in the table above, the approximate fair value of the shares upon conversion of the 4.25% Exchangeable Notes as of December 31, 2012 and December 31, 2011 would have been as follows:

	December 31, 2012 (1)		December 31, 2011 (2)
	(in thousands)
Approximate fair value of shares upon conversion	$	221,200	$	179,100
Principal amount of 4.25% Exchangeable Notes	172,500		172,500
Approximate fair value in excess amount of principal amount	$	48,700	$	6,600

_______________

(1) Although the 4.25% Exchangeable Notes were exchangeable during the three months ended December 31, 2012, no 4.25% Exchangeable Notes were exchanged during the period. The 4.25% Exchangeable Notes were not exchangeable during the remainder of the year.

(2) The 4.25% Exchangeable Notes were not exchangeable during the year ended December 31, 2011.

Interest expense for the exchangeable notes

The following table summarizes the total interest expense attributable to the Exchangeable Notes based on the effective interest rates set forth above, before the effect of capitalized interest, for the years ended December 31, 2012, 2011, and 2010:

	Year Ended December 31,
	2012		2011		2010
	(in thousands)
Contractual interest payments	$	8,721	$	12,141	$	14,565
Amortization of discount	5,052		6,928		7,965
Interest expense attributable to Exchangeable Notes	$	13,773	$	19,069	$	22,530

Capped call Transactions

The table below summarizes our capped call option positions for the 4.25% Exchangeable Notes as of both December 31, 2012 and 2011:

	4.25% Exchangeable Notes (1)
Referenced shares of common stock	4,800,796
Exchange price including effect of capped calls	$42.81

________________________

(1) The capped calls mitigate the dilutive impact to us of the potential exchange of all of the 4.25% Exchangeable Notes into shares of common stock.

Terms of the Credit Facility

The following table summarizes the terms of our revolving credit facility as of December 31, 2012 and December 31, 2011:

	December 31, 2012			December 31, 2011
	(in thousands)
Outstanding borrowings	$	185,000		$	182,000
Remaining borrowing capacity	315,000			318,000
Total borrowing capacity (1)	$	500,000		$	500,000
Interest rate (2)	1.66		%	2.05		%
Facility fee-annual rate (3)	0.300		%	0.350		%
Maturity date (4)	April 2017			August 2015

_______________________

(1) We may elect to borrow, subject to bank approval, up to an additional $200.0 million under an accordion feature under the terms of the revolving credit facility.

(2) The revolving credit facility interest rate was calculated based on an annual rate of LIBOR plus 1.450% and 1.750% as of December 31, 2012 and December 31, 2011, respectively.

(3) The facility fee is paid on a quarterly basis and is calculated based on the total borrowing capacity. In addition to the facility fee, we also incurred debt origination and legal costs of approximately $5.0 million when we entered into the revolving credit facility in 2010, an additional $3.3 million when we amended the terms of the revolving credit facility in June 2011 and an additional $1.9 million when we amended the terms of the revolving credit facility in November 2012. The unamortized balance of these costs are amortized through the extended maturity date of the revolving credit facility.

(4) Under the original and all amended terms of the revolving credit facility, we may exercise an option to extend the maturity date by one year.

Stated debt maturities and scheduled amortization payments, excluding debt discounts

The following table summarizes the stated debt maturities and scheduled amortization payments, excluding debt discounts and premiums, as of December 31, 2012:

Year Ending	(in thousands)
2013	$	90,881
2014	263,913
2015	393,711
2016	247,822
2017	255,036
Thereafter	793,056
Total	$	2,044,419	(1)

_______________________

(1) Includes gross principal balance of outstanding debt before impact of all debt discounts and premiums.

Capitalized interest and loan fees

The following table sets forth our gross interest expense reported in continuing operations, including debt discount/premium and loan cost amortization, net of capitalized interest, for the years ended December 31, 2012, 2011 and 2010. The interest expense capitalized was recorded as a cost of development and redevelopment, and increased the carrying value of undeveloped land and construction in progress. (See Note 17 for interest expense reported in discontinued operations).

	Year Ended December 31,
	2012			2011			2010 (1)
	(in thousands)
Gross interest expense	$	98,906		$	94,915		$	69,661
Capitalized interest	(19,792		)	(9,130		)	(10,015		)
Interest expense	$	79,114		$	85,785		$	59,646

Secured Debt [Member]

Debt Instrument [Line Items]

Debt balance and significant terms

The following table sets forth the composition of our secured debt as of December 31, 2012 and 2011:

	Annual Stated	GAAP		December 31,
Type of Debt	Interest Rate (1)	Effective Rate (1)(2)	Maturity Date	2012 (11)		2011 (11)
				(in thousands)
Mortgage note payable	4.27%	4.27%	February 2018	$	135,000	$	135,000
Mortgage note payable (3)(9)	4.48%	4.48%	July 2027	97,000		—
Mortgage note payable (4)(9)	6.37%	3.55%	April 2013	83,116		—
Mortgage note payable (5)	5.57%	5.57%	August 2012	—		71,517
Mortgage note payable	6.51%	6.51%	February 2017	68,615		69,507
Mortgage note payable (6)(9)	5.23%	3.50%	January 2016	56,302		—
Mortgage note payable (7)(9)	5.57%	3.25%	February 2016	43,016		—
Mortgage note payable (8)(9)	5.09%	3.50%	August 2015	35,379		—
Mortgage note payable (9)	4.94%	4.00%	April 2015	28,941		30,191
Mortgage note payable (5)	4.95%	4.95%	August 2012	—		29,754
Mortgage note payable	7.15%	7.15%	May 2017	11,210		13,294
Public facility bonds (10)	Various	Various	Various	2,517		2,562
Total				$	561,096	$	351,825

_______________________

(1) All interest rates presented are fixed-rate interest rates.

(2) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of discounts/premiums, excluding debt issuance costs.

(3) In June 2012, we obtained a mortgage loan that is secured by one office property located in Irvine, California and two office properties located in Los Angeles, California and requires monthly principal and interest payments based on a 30 year amortization period with an initial 3 years of interest only payments.

(4) In July 2012, in connection with the acquisition of one office building in Bellevue, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $83.6 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $1.4 million. The loan requires monthly principal and interest payments based on a 30 year amortization period. In January 2013, we repaid this loan prior to the stated maturity.

(5) In May 2012, we repaid these loans prior to the stated maturity.

(6) In July 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage had a principal balance of $53.9 million at the acquisition date and was recorded at fair value on the date of the acquisition resulting in a premium of approximately $3.1 million. The loan requires monthly principal and interest payments based on a 30 year amortization period.

(7) In October 2012, in connection with the acquisition of one office building in Los Angeles, California, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $40.7 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium of

approximately $2.7 million.

(8) In June 2012, in connection with the acquisition of two office buildings in Seattle, Washington, we assumed a mortgage loan that is secured by the project. The assumed mortgage loan had a principal balance of $34.0 million at the acquisition date and was recorded at fair value at the date of acquisition resulting in an initial premium of

approximately $1.7 million.

(9) The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.

(10) The public facility bonds (the “Bonds”), the proceeds from which were used to finance infrastructure improvements on one of the Company’s undeveloped land parcels, were issued in February 2008 by the City of Carlsbad. The Bonds have annual maturities from September 1, 2013 through September 1, 2038, with interest rates ranging from 4.74% to 6.20%. Principal and interest payments for the Bonds will be charged through the assessment of special property taxes.

(11) Amounts reported include the amounts of unamortized debt premiums and discounts for the periods presented.

Exchangeable Notes [Member]

Debt Instrument [Line Items]

Debt balance and significant terms

The following table summarizes the balance and significant terms of the Company's 3.25% Exchangeable Notes due April 2012 (the "3.25% Exchangeable Notes") and 4.25% Exchangeable Notes due November 2014 (the "4.25% Exchangeable Notes" and together with the 3.25% Exchangeable Notes, the "Exchangeable Notes") outstanding as of December 31, 2012 and 2011. The Company repaid the 3.25% Exchangeable Notes in April 2012 upon maturity.

	3.25% Exchangeable Notes					4.25% Exchangeable Notes
	December 31, 2012		December 31, 2011			December 31, 2012			December 31, 2011
	(in thousands)
Principal amount	$	—	$	148,000		$	172,500		$	172,500
Unamortized discount	—		(924		)	(8,556		)	(12,684		)
Net carrying amount of liability component	$	—	$	147,076		$	163,944		$	159,816
Carrying amount of equity component			$33,675			$19,835
Issuance date			April 2007			November 2009
Maturity date			April 2012			November 2014
Stated coupon rate (1)			3.25%			4.25%
Effective interest rate (2)			5.45%			7.13%
Exchange rate per $1,000 principal value of the Exchangeable Notes, as adjusted (3)						27.8307
Exchange price, as adjusted (3)						$35.93
Number of shares on which the aggregate consideration to be delivered on conversion is determined (3)						4,800,796

_______________

(1) Interest on the 4.25% Exchangeable Notes is payable semi-annually in arrears on May 15th and November 15th of each year.

(2) The rate at which we record interest expense for financial reporting purposes, which reflects the amortization of the discounts on the Exchangeable Notes (see Note 2). This rate represents our conventional debt borrowing rate at the date of issuance.

(3) The exchange rate, exchange price, and the number of shares to be delivered upon conversion are subject to adjustment under certain circumstances including increases in our common dividends.  

Unsecured Senior Notes [Member]

Debt Instrument [Line Items]

Debt balance and significant terms

The following table summarizes the balance and significant terms of the registered unsecured senior notes issued by the Operating Partnership as of December 31, 2012 and 2011:

	4.800% Unsecured Senior Notes						6.625% Unsecured Senior Notes						5.000% Unsecured Senior Notes
	December 31, 2012			December 31, 2011			December 31, 2012			December 31, 2011			December 31, 2012			December 31, 2011
	(in thousands)
Principal amount	$	325,000		$	325,000		$	250,000		$	250,000		$	325,000		$	325,000
Unamortized discount	(413		)	(486		)	(1,580		)	(1,793		)	(112		)	(152		)
Net carrying amount	$	324,587		$	324,514		$	248,420		$	248,207		$	324,888		$	324,848
Issuance date	July 2011						May 2010						November 2010
Maturity date	July 2018						June 2020						November 2015
Stated coupon rate (1)(2)(3)	4.800%						6.625%						5.000%
Effective interest rate (4)	4.827%						6.743%						5.014%

________________________

(1) Interest on the 4.800% unsecured senior notes is payable semi-annually in arrears on January 15th and July 15th of each year.

(2) Interest on the 6.625% unsecured senior notes is payable semi-annually in arrears on June 1st and December 1st of each year.

(3) Interest on the 5.000% unsecured senior notes is payable semi-annually in arrears on May 3rd and November 3rd of each year.

(4) This represents the rate at which interest expense is recorded for financial reporting purposes, which reflects the amortization of initial issuance discounts, excluding debt issuance costs.

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Net Income Available to Common Unitholders Per Unit of the Operating Partnership (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Numerator:
Income (loss) from continuing operations	$ 3,911	[1]	$ (665)	[1]	$ 36	[1]	$ 2,165	[1]	$ (16)	[1]	$ (3,391)	[1]	$ (1,071)	[1]	$ 750	[1]	$ 5,447	$ (3,728)	$ (427)
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest																	(383)	(545)	(468)
PREFERRED DISTRIBUTIONS	(3,313)		(5,342)		(3,097)		(9,336)		(3,799)		(3,799)		(3,799)		(3,799)		(21,088)	(15,196)	(15,196)
Allocation to participating securities (nonvested units and RSUs)																	(1,602)	(1,309)	(1,151)
Numerator for basic and diluted (loss) income from continuing operations available to common unitholders																	(16,860)	(19,688)	(16,306)
Income from discontinued operations	189,720	[1]	3,187	[1]	2,241	[1]	76,506	[1]	44,876	[1]	17,681	[1]	4,543	[1]	4,117	[1]	271,654	71,217	20,313
Income from discontinued operations attributable to noncontrolling interests in consolidated subsidiaries																	(6,570)	(2,019)	(646)
Numerator for basic and diluted net income (loss) available to common unitholders																	248,224	49,510	3,361
Denominator:
Basic weighted average vested units outstanding																	69,639,623	56,717,121	49,497,487
Effect of dilutive securities - contingently issuable shares and stock options																	0	0	0
Diluted weighted average vested units and common unit equivalents outstanding																	69,639,623	56,717,121	49,497,487
Basic earnings per unit:
Loss from continuing operations available to common stockholders per common share-basic (Note 19)																	$ (0.24)	$ (0.35)	$ (0.33)
Income from discontinued operations per common unit																	$ 3.80	$ 1.22	$ 0.40
Net income available to common unitholders per unit-basic (Note 20)	$ 2.49	[2]	$ (0.04)	[2]	$ (0.02)	[2]	$ 1.06	[2]	$ 0.68	[2]	$ 0.17	[2]	$ (0.01)	[2]	$ 0.01	[2]	$ 3.56	$ 0.87	$ 0.07
Diluted earnings per unit:
Loss from continuing operations available to common stockholders per common share-diluted (Note 19)																	$ (0.24)	$ (0.35)	$ (0.33)
Income from discontinued operations per common unit																	$ 3.80	$ 1.22	$ 0.40
Net income available to common unitholders per unit-diluted (Note 20)	$ 2.45	[2]	$ (0.04)	[2]	$ (0.02)	[2]	$ 1.06	[2]	$ 0.68	[2]	$ 0.17	[2]	$ (0.01)	[2]	$ 0.01	[2]	$ 3.56	$ 0.87	$ 0.07
Number of options, outstanding	1,540,000								5,000								1,540,000	5,000
Kilroy Realty, L.P. [Member]
Numerator:
Income (loss) from continuing operations	3,911	[1]	(665)	[1]	36	[1]	2,165	[1]	(16)	[1]	(3,391)	[1]	(1,071)	[1]	750	[1]	5,447	(3,728)	(427)
Income (Loss) from Continuing Operations Attributable to Noncontrolling Interest																	(174)	529	162
PREFERRED DISTRIBUTIONS	(3,313)		(5,342)		(3,097)		(9,336)		(3,799)		(3,799)		(3,799)		(3,799)		(21,088)	(15,196)	(15,196)
Allocation to participating securities (nonvested units and RSUs)																	(1,602)	(1,309)	(1,151)
Numerator for basic and diluted (loss) income from continuing operations available to common unitholders																	(17,417)	(20,762)	(16,936)
Income from discontinued operations	189,720	[1]	3,187	[1]	2,241	[1]	76,506	[1]	44,876	[1]	17,681	[1]	4,543	[1]	4,117	[1]	271,654	71,217	20,313
Income from discontinued operations attributable to noncontrolling interests in consolidated subsidiaries																	(464)	0	0
Numerator for basic and diluted net income (loss) available to common unitholders																	$ 253,773	$ 50,455	$ 3,377
Denominator:
Basic weighted average vested units outstanding																	71,403,258	58,437,444	51,220,618
Effect of dilutive securities - contingently issuable shares and stock options																	0	0	0
Diluted weighted average vested units and common unit equivalents outstanding																	71,403,258	58,437,444	51,220,618
Basic earnings per unit:
Loss from continuing operations available to common stockholders per common share-basic (Note 19)																	$ (0.24)	$ (0.36)	$ (0.33)
Income from discontinued operations per common unit																	$ 3.80	$ 1.22	$ 0.40
Net income available to common unitholders per unit-basic (Note 20)	$ 2.48	[3]	$ (0.04)	[3]	$ (0.02)	[3]	$ 1.05	[3]	$ 0.68	[3]	$ 0.17	[3]	$ (0.01)	[3]	$ 0.01	[3]	$ 3.56	$ 0.86	$ 0.07
Diluted earnings per unit:
Loss from continuing operations available to common stockholders per common share-diluted (Note 19)																	$ (0.24)	$ (0.36)	$ (0.33)
Income from discontinued operations per common unit																	$ 3.80	$ 1.22	$ 0.40
Net income available to common unitholders per unit-diluted (Note 20)	$ 2.44	[3]	$ (0.04)	[3]	$ (0.02)	[3]	$ 1.05	[3]	$ 0.68	[3]	$ 0.17	[3]	$ (0.01)	[3]	$ 0.01	[3]	$ 3.56	$ 0.86	$ 0.07
Market Measure-Based Restricted Stock Units (RSUs) [Member]
Diluted earnings per unit:
Number of RSUs outstanding	88,490																88,490

[1] All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

[2] The summation of the quarterly financial data may not equal the annual number reported on the consolidated statements of operations due to rounding. The summation of the quarterly net income (loss) available to common stockholders per share does not equal the annual number reported on the consolidated statements of operations due to the impact of equity offerings that occurred during the years ended December 31, 2012 and 2011.

[3] Net Operating Income is defined as operating revenues (rental income, tenant reimbursements, and other property income) less property and related expenses (property expenses, real estate taxes, ground leases, and provisions for bad debts) and excludes other non−property related income and expenses such as interest income and other net investment gains (losses) and interest expense, depreciation and amortization, acquisition−related expenses and corporate general and administrative expenses.

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Schedule II Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2012

Valuation and Qualifying Accounts [Abstract]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

	Balance at Beginning of Period		Charged to Costs and Expenses (1)			Recoveries (Deductions)			Balance at End of Period
Allowance for Uncollectible Tenant Receivables
Year ended December 31, 2012—Allowance for uncollectible tenant receivables	$	2,590	$	(42	)	$	33		$	2,581
Year ended December 31, 2011—Allowance for uncollectible tenant receivables	$	2,819	$	923		$	(1,152	)	$	2,590
Year ended December 31, 2010—Allowance for uncollectible tenant receivables	$	3,063	$	16		$	(260	)	$	2,819
Allowance for Unbilled Deferred Rent
Year ended December 31, 2012—Allowance for deferred rent	$	3,406	$	—		$	(799	)	$	2,607
Year ended December 31, 2011—Allowance for deferred rent	$	3,831	$	(279	)	$	(146	)	$	3,406
Year ended December 31, 2010—Allowance for deferred rent	$	6,388	$	(1,079	)	$	(1,478	)	$	3,831

____________________

(1) Includes amounts reported in Discontinued Operations (see Note 17).

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Tax Treatment of Distributions Tax Treatment of Distributions (Details 1) (USD $)	12 Months Ended			0 Months Ended	12 Months Ended			0 Months Ended	12 Months Ended			1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2012 Common Stock [Member]	Dec. 31, 2011 Common Stock [Member]	Dec. 31, 2010 Common Stock [Member]	Apr. 16, 2012 Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2010 Series E Cumulative Redeemable Preferred Stock [Member]	Apr. 16, 2012 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2010 Series F Cumulative Redeemable Preferred Stock [Member]	Mar. 31, 2012 Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series G Cumulative Redeemable Preferred Stock [Member]	Aug. 31, 2012 Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Tax Treatment, Ordinary Income [Member] Common Stock [Member]	Dec. 31, 2011 Tax Treatment, Ordinary Income [Member] Common Stock [Member]	Dec. 31, 2010 Tax Treatment, Ordinary Income [Member] Common Stock [Member]	Dec. 31, 2012 Tax Treatment, Ordinary Income [Member] Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Tax Treatment, Ordinary Income [Member] Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2010 Tax Treatment, Ordinary Income [Member] Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Tax Treatment, Ordinary Income [Member] Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Tax Treatment, Ordinary Income [Member] Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2010 Tax Treatment, Ordinary Income [Member] Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Tax Treatment, Ordinary Income [Member] Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Tax Treatment, Ordinary Income [Member] Series H Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Tax Treatment, Return of Capital [Member] Common Stock [Member]	Dec. 31, 2011 Tax Treatment, Return of Capital [Member] Common Stock [Member]	Dec. 31, 2010 Tax Treatment, Return of Capital [Member] Common Stock [Member]	Dec. 31, 2012 Tax Treatment, Capital Gains [Member] Common Stock [Member]		Dec. 31, 2011 Tax Treatment, Capital Gains [Member] Common Stock [Member]		Dec. 31, 2010 Tax Treatment, Capital Gains [Member] Common Stock [Member]		Dec. 31, 2012 Tax Treatment, Capital Gains [Member] Series E Cumulative Redeemable Preferred Stock [Member]		Dec. 31, 2011 Tax Treatment, Capital Gains [Member] Series E Cumulative Redeemable Preferred Stock [Member]		Dec. 31, 2010 Tax Treatment, Capital Gains [Member] Series E Cumulative Redeemable Preferred Stock [Member]		Dec. 31, 2012 Tax Treatment, Capital Gains [Member] Series F Cumulative Redeemable Preferred Stock [Member]		Dec. 31, 2011 Tax Treatment, Capital Gains [Member] Series F Cumulative Redeemable Preferred Stock [Member]		Dec. 31, 2010 Tax Treatment, Capital Gains [Member] Series F Cumulative Redeemable Preferred Stock [Member]		Dec. 31, 2012 Tax Treatment, Capital Gains [Member] Series G Cumulative Redeemable Preferred Stock [Member]		Dec. 31, 2012 Tax Treatment, Capital Gains [Member] Series H Cumulative Redeemable Preferred Stock [Member]		Dec. 31, 2012 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Common Stock [Member]	Dec. 31, 2011 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Common Stock [Member]	Dec. 31, 2010 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Common Stock [Member]	Dec. 31, 2012 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2010 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Series E Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2011 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2010 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Series F Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Series G Cumulative Redeemable Preferred Stock [Member]	Dec. 31, 2012 Tax Treatment, Unrecaptured Section 1250 Gains [Member] Series H Cumulative Redeemable Preferred Stock [Member]
Class of Stock [Line Items]
Preferred stock, dividend rate				7.80%		7.80%		7.50%		7.50%		6.875%	6.875%		6.375%	6.375%
Dividends paid per common share	$ 1.400	$ 1.400	$ 1.400															$ 0.577	$ 0.230	$ 0.000									$ 0.823	$ 1.170	$ 1.400	$ 0.000	[1]	$ 0.000	[1]	$ 0.000	[1]																	$ 0.000	$ 0.000	$ 0.000
Common Stock, Dividends, Per Share, Cash Paid, Percentage	100.00%	100.00%	100.00%															41.21%	16.43%	0.00%									58.79%	83.57%	100.00%	0.00%	[1]	0.00%	[1]	0.00%	[1]																	0.00%	0.00%	0.00%
Preferred Stock, Dividends, Per Share, Cash Paid					$ 0.818	$ 1.950	$ 1.950		$ 0.786	$ 1.875	$ 1.875		$ 1.089			$ 0.398					$ 0.818	$ 1.950	$ 1.950	$ 0.786	$ 1.875	$ 1.875	$ 1.089	$ 0.398										$ 0.000	[1]	$ 0.000	[1]	$ 0.000	[1]	$ 0.000	[1]	$ 0.000	[1]	$ 0.000	[1]	$ 0.000	[1]	$ 0.000	[1]				$ 0.000	$ 0.000	$ 0.000	$ 0.000	$ 0.000	$ 0.000	$ 0.000	$ 0.000
Preferred Stock, Dividends, Per Share, Cash Paid, Percentage					100.00%	100.00%	100.00%		100.00%	100.00%	100.00%		100.00%			100.00%					100.00%	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%	100.00%										0.00%	[1]	0.00%	[1]	0.00%	[1]	0.00%	[1]	0.00%	[1]	0.00%	[1]	0.00%	[1]	0.00%	[1]				0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%	0.00%
Capital Gains, Percent	15.00%								15.00%							15.00%

[1] Capital gains are comprised entirely of 15% rate gains.

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Consolidated Statements of Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total		Total Stockholders' Equity	Preferred Stock [Member]	Common Stock [Member]	Common Stock Additional Paid-in Capital	Common Stock Distributions in Excess of Earnings	Noncontrolling Interests - Common Units of the Operating Partnership	Series E and Series F Cumulative Redeemable Preferred Stock [Member] Common Stock Distributions in Excess of Earnings	Series A Preferred Units [Member]	Series A Preferred Units [Member] Total Stockholders' Equity	Series A Preferred Units [Member] Common Stock Distributions in Excess of Earnings
Beginning Balance at Dec. 31, 2009	$ 883,838		$ 854,948	$ 121,582	$ 431	$ 913,657	$ (180,722)	$ 28,890
Beginning Balance, shares at Dec. 31, 2009					43,148,762
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	19,886		19,708				19,708	178
Issuance of common stock (Note 10)	299,847		299,847		92	299,755
Issuance of share-based compensation awards (Note 12)	2,151		2,151			2,151
Issuance of share-based compensation awards, shares (Note 12)					3,239
Noncash amortization of share-based compensation	6,687		6,687			6,687
Exercise of stock options, shares					4,000
Exercise of stock options	83		83			83
Issuance of common units in the Operating Partnership in connection with an operating property acquisition (Note 3)	0
Repurchase of common stock and restricted stock units (Note 12)	(2,121)		(2,121)			(2,121)
Repurchase of common stock and restricted stock units, shares (Note 12)					(59,782)
Settlement of restricted stock units for shares of common stock (Note 12)	(1,296)		(1,296)			(1,296)
Settlement of restricted stock units for shares of common stock, shares (Note 12)					53,451
Allocation to the equity component of cash paid upon repurchase of 3.25% Exchangeable Notes (Note 7)	(2,694)		(2,694)			(2,694)
Adjustment for noncontrolling interest (Note 2)	0		(4,724)			(4,724)		4,724
Preferred dividends and distributions	(15,196)		(15,196)				(15,196)
Dividends declared per common share and common unit ($1.40 per share/ unit for 2010, 2011 and $1.63 per share/unit for 2009)	(73,455)		(71,042)				(71,042)	(2,413)
Ending Balance at Dec. 31, 2010	1,117,730		1,086,351	121,582	523	1,211,498	(247,252)	31,379
Ending Balance, shares at Dec. 31, 2010					52,349,670
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	67,489		66,015				66,015	1,474
Issuance of common stock (Note 10)	233,312		233,312		64	233,248
Issuance of common stock, shares (Note 10)					6,392,805
Issuance of share-based compensation awards (Note 12)	2,739		2,739		1	2,738
Issuance of share-based compensation awards, shares (Note 12)					68,727
Noncash amortization of share-based compensation	5,588		5,588			5,588
Exercise of stock options, shares					15,000
Exercise of stock options	395		395			395
Issuance of common units in the Operating Partnership in connection with an operating property acquisition (Note 3)	0
Repurchase of common stock and restricted stock units (Note 12)	(1,152)		(1,152)			(1,152)
Repurchase of common stock and restricted stock units, shares (Note 12)					(11,485)
Exchange of common units of the Operating Partnership (Note 10)	0		91			91		(91)
Exchange of common units of the Operating Partnership, shares (Note 10)					5,000
Adjustment for noncontrolling interest (Note 2)	0		(3,409)			(3,409)		3,409
Preferred Stock Dividends, Income Statement Impact	15,196		15,196				15,196
Preferred dividends and distributions	(15,196)
Dividends declared per common share and common unit ($1.40 per share/ unit for 2010, 2011 and $1.63 per share/unit for 2009)	(83,423)		(81,017)				(81,017)	(2,406)
Ending Balance at Dec. 31, 2011	1,327,482		1,293,717	121,582	588	1,448,997	(277,450)	33,765
Ending Balance, shares at Dec. 31, 2011	58,819,717	[1]			58,819,717
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	277,101		270,914				270,914	6,187
Proceeds from issuance of preferred stock	192,411		192,411	192,411
Redemption of Series E and Series F Preferred units (Note 11), shares				121,582
Stock redeemed during period, value	(126,500)		(126,500)						(4,918)	(2,062)	(2,062)	(2,062)
Issuance of common stock (Note 10)	672,102		672,102		161	671,941
Issuance of common stock, shares (Note 10)					16,024,618
Issuance of share-based compensation awards (Note 12)	1,291		1,291		0	1,291
Issuance of share-based compensation awards, shares (Note 12)					62,137
Noncash amortization of share-based compensation	8,537		8,537			8,537
Exercise of stock options, shares	5,000				5,000
Exercise of stock options	129		129			129
Issuance of common units in the Operating Partnership in connection with an operating property acquisition (Note 3)	5,604							5,604
Repurchase of common stock and restricted stock units (Note 12)	(877)		(877)			(877)
Repurchase of common stock and restricted stock units, shares (Note 12)					(22,312)
Settlement of restricted stock units for shares of common stock (Note 12)	(784)		(784)			(784)
Settlement of restricted stock units for shares of common stock, shares (Note 12)					27,821
Exchange of common units of the Operating Partnership (Note 10)	0		231			231		(231)
Exchange of common units of the Operating Partnership, shares (Note 10)					10,000
Adjustment for noncontrolling interest (Note 2)	0		(3,460)			(3,460)		3,460
Preferred Stock Dividends, Income Statement Impact	14,108		14,108				14,108
Preferred dividends and distributions	(21,088)
Dividends declared per common share and common unit ($1.40 per share/ unit for 2010, 2011 and $1.63 per share/unit for 2009)	(104,393)		(101,911)				(101,911)	(2,482)
Ending Balance at Dec. 31, 2012	$ 2,235,933		$ 2,189,630	$ 192,411	$ 749	$ 2,126,005	$ (129,535)	$ 46,303
Ending Balance, shares at Dec. 31, 2012	74,926,981	[1]			74,926,981

[1] The amount includes nonvested shares.

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Preferred and Common Units of the Operating Partnership (Details) (USD $) In Thousands, except Share data, unless otherwise specified	Dec. 31, 2012		Dec. 31, 2011
Accrued distributions
Accrued dividends and distributions	$ 28,924		$ 22,692
Summary of units
Common units held by limited partners	1,826,503		1,718,131
Restricted Stock Units (RSUs) [Member]
Accrued distributions
Accrued dividends and distributions	367	[1]	295	[1]
Kilroy Realty, L.P. [Member]
Accrued distributions
Accrued dividends and distributions	28,924		22,692
Summary of units
Common units held by general partner	74,926,981		58,819,717
Common units held by limited partners	1,826,503		1,718,131
Kilroy Realty, L.P. [Member] | Restricted Stock Units (RSUs) [Member]
Accrued distributions
Accrued dividends and distributions	367	[2]	295	[2]
Summary of units
RSUs	1,048,863		842,675
Kilroy Realty, L.P. [Member] | Partners Capital Common Unit [Member]
Accrued distributions
Accrued dividends and distributions	27,230		21,483
Kilroy Realty, L.P. [Member] | Partners Capital General Partner [Member]
Accrued distributions
Accrued dividends and distributions	26,224		20,587
Kilroy Realty, L.P. [Member] | Partners Capital Limited Partner [Member]
Accrued distributions
Accrued dividends and distributions	639		601
Kilroy Realty, L.P. [Member] | Partners Capital Preferred Units [Member]
Accrued distributions
Accrued dividends and distributions	$ 1,694		$ 1,209
Kilroy Realty, L.P. [Member] | Series E Cumulative Redeemable Preferred Unit [Member]
Summary of units
Preferred units outstanding			1,610,000
Kilroy Realty, L.P. [Member] | Series F Cumulative Redeemable Preferred Unit [Member]
Summary of units
Preferred units outstanding			3,450,000
Kilroy Realty, L.P. [Member] | Series G Cumulative Redeemable Preferred Unit [Member]
Summary of units
Preferred units outstanding	4,000,000
Kilroy Realty, L.P. [Member] | Series H Cumulative Redeemable Preferred Unit [Member]
Summary of units
Preferred units outstanding	4,000,000

[1] The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12)

[2] The amount includes the value of the dividend equivalents that will be paid with additional fully-vested RSUs (see Note 12).

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Consolidated Balance Sheets (KILROY REALTY, L.P.) (Parenthetical) (Kilroy Realty, L.P. [Member], USD $) In Thousands, except Share data, unless otherwise specified			12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2011 Series A Preferred Units [Member]	Dec. 31, 2011 Series E Cumulative Redeemable Preferred Unit [Member]	Dec. 31, 2012 Series E Cumulative Redeemable Preferred Unit [Member]	Dec. 31, 2011 Series F Cumulative Redeemable Preferred Unit [Member]	Dec. 31, 2012 Series F Cumulative Redeemable Preferred Unit [Member]	Dec. 31, 2012 Series G Cumulative Redeemable Preferred Unit [Member]	Mar. 31, 2012 Series G Cumulative Redeemable Preferred Unit [Member]	Dec. 31, 2012 Series H Cumulative Redeemable Preferred Unit [Member]	Aug. 31, 2012 Series H Cumulative Redeemable Preferred Unit [Member]
General Partners' Capital Account, Units Issued	74,926,981	58,819,717
General Partners' Capital Account, Units Outstanding	74,926,981	58,819,717
Limited Partners' Capital Account, Units Issued	1,826,503	1,718,131
Common units held by limited partners	1,826,503	1,718,131
Preferred stock dividend rate percentage			7.45%	7.80%		7.50%		6.875%		6.375%
Preferred Units, Issued				1,610,000		3,450,000		4,000,000	4,000,000	4,000,000	4,000,000
Preferred units outstanding				1,610,000		3,450,000		4,000,000		4,000,000
Preferred stock liquidation preference				$ 40,250		$ 86,250		$ 100,000		$ 100,000

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Segment Disclosure (Tables)

12 Months Ended

Dec. 31, 2012

Segment Reporting [Abstract]

Reconciliation of Assets from Segment to Consolidated [Table Text Block]

The following table, which reconciles total segment assets to total consolidated assets, is presented solely for the purposes of showing the comparative information for our asset composition at December 31, 2012 and December 31, 2011.

	December 31,
	2012		2011
	(in thousands)
Assets:
Reportable Segment - Office Properties
Land, buildings, and improvements, net	$	3,191,225	$	2,480,338
Undeveloped land and construction in progress	809,654		430,806
Total assets(1)	4,315,485		3,248,661
Non-Reportable Segment - Industrial Properties
Land, buildings, and improvements, net	—		145,043
Total assets(1)	—		156,741
Total Segments
Land, buildings, and improvements, net	3,191,225		2,625,381
Undeveloped land and construction in progress	809,654		430,806
Total assets(1)	4,315,485		3,405,402

Reconciliation to Consolidated Assets:
Total assets allocated to segments	4,315,485		3,405,402
Other unallocated assets:
Cash and cash equivalents	16,700		4,777
Restricted cash	247,544		358
Marketable securities	7,435		5,691
Deferred financing costs, net	18,971		18,368
Prepaid expenses and other assets, net	9,949		12,199
Total consolidated assets	$	4,616,084	$	3,446,795

_______________

(1) Includes land, buildings, and improvements, undeveloped land and construction in progress, real estate assets held for sale, current receivables, deferred rent receivables, deferred

leasing costs, and acquisition-related intangible assets, all shown on a net basis.

Schedule of Segment Reporting Expenditures for Acquisitions and Capital Expenditures [Table Text Block]

	December 31,
	2012		2011
	(in thousands)
Acquisitions and Capital Expenditures:(1)
Reportable Segment - Office Properties
Expenditures for real estate acquisitions	$	1,087,489	$	663,483
Expenditures for development and redevelopment properties and undeveloped land	144,477		32,198
Expenditures for operating properties(2)	86,089		66,448
Non-Reportable Segment - Industrial Properties
Expenditures for operating properties(2)	1,131		6,001
Total Segments
Expenditures for real estate acquisitions	1,087,489		663,483
Expenditures for development and redevelopment properties and undeveloped land	144,477		32,198
Expenditures for operating properties(2)	87,220		72,449

_______________

(1) Total consolidated acquisitions and capital expenditures are equal to the same amounts disclosed for total segments. Amounts represent balances on an accrual basis.

(2) Includes expenditures for building improvements, tenant improvements, deferred leasing costs and acquisition-related intangible assets for our operating properties. Excludes acquisition-related intangible liabilities.

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Deferred Revenue and Acquisition Related Liabilities, net Deferred Revenue and Acquisition Related Liabilities, net (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Deferred Revenue [Abstract]
Deferred revenue related to tenant-funded tenant improvements	$ 56,461		$ 41,884
Other deferred revenue	2,314		1,310
Acquisition-related intangible liabilities, net	59,129	[1],[2]	36,587	[1],[2]
Deferred revenue and acquisition-related intangible liabilities, net	117,904		79,781
2013	10,054
2014	9,339
2015	8,255
2016	7,825
2017	6,409
Thereafter	14,579
Total	$ 56,461

[1] See Note 4 for additional information.

[2] Included in deferred revenue and acquisition-related intangible liabilities, net in the consolidated balance sheets.

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Tax Treatment of Distributions Tax Treatment of Distributions (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Class of Stock [Line Items]
Dividends declared per common share	$ 1.4	$ 1.4	$ 1.4
Common Stock [Member]
Class of Stock [Line Items]
Dividends declared per common share	$ 1.400	$ 1.400	$ 1.400
Less: Dividends declared in the current year and paid in the following year	$ (0.350)	$ (0.350)	$ (0.350)
Add: Dividends declared in the prior year and paid in the current year	$ 0.350	$ 0.350	$ 0.350
Dividends paid per common share	$ 1.400	$ 1.400	$ 1.400

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Acquisitions (Details) (USD $)									12 Months Ended								12 Months Ended																12 Months Ended			12 Months Ended		12 Months Ended			12 Months Ended		12 Months Ended		12 Months Ended									12 Months Ended
	Dec. 31, 2012 sqft		Dec. 31, 2011		Dec. 31, 2012 Real Estate Acquisitions [Member] building sqft		Dec. 31, 2011 Real Estate Acquisitions [Member] building sqft		Dec. 31, 2012 Bohannon Drive Menlo Park, CA [Member] sqft building		Dec. 31, 2012 Fremont Lake Union Center Seattle WA [Member] sqft building		Dec. 31, 2012 Fremont Lake View Seattle WA [Member] building sqft		Dec. 31, 2012 Fourth Street Bellevue WA [Member]		Dec. 31, 2012 Olympic Blvd 12233, Los Angeles, CA [Member] building sqft		Dec. 31, 2012 N. Mathilda Avenue 599, Sunnyvale, CA [Member] sqft building		Dec. 31, 2011 601 108th Avenue N.E Bellevue, WA [Member]		Dec. 31, 2011 201 Third Street San Francisco CA [Member]		Dec. 31, 2012 All Other Acquisitions [Member]		Dec. 31, 2011 All Other Acquisitions [Member]		Dec. 31, 2012 Development and Redevelopment Project Acquisitions [Member] project		Dec. 31, 2011 Development and Redevelopment Project Acquisitions [Member]		Dec. 31, 2012 Middlefield, Mountain View, CA [Member]	May 09, 2012 Middlefield, Mountain View, CA [Member]		Dec. 31, 2012 Brannan Street 333, San Francisco, CA [Member]	Oct. 23, 2012 Brannan Street 333, San Francisco, CA [Member]	Dec. 31, 2012 6121 Sunset Boulevard, Los Angeles, CA [Member]	Sep. 28, 2012 6121 Sunset Boulevard, Los Angeles, CA [Member]		Dec. 31, 2012 Mission St., 350, San Francisco, CA [Member]	Oct. 23, 2012 Mission St., 350, San Francisco, CA [Member]	Dec. 31, 2012 Fairchild Drive, 331, Mountain View, CA [Member]	Dec. 04, 2012 Fairchild Drive, 331, Mountain View, CA [Member]	Dec. 31, 2012 Mathilda, 555, Sunnyvale, CA [Member]		Dec. 10, 2012 Mathilda, 555, Sunnyvale, CA [Member]		Dec. 31, 2012 All Other Acquisitions [Member]		Dec. 31, 2012 Office Properties [Member] sqft		Dec. 31, 2012 Office Properties [Member] Real Estate Acquisitions [Member] building	Dec. 31, 2012 Office Properties [Member] Fourth Street Bellevue WA [Member] building sqft		Dec. 31, 2012 Office Properties [Member] 6255 Sunset Boulevard, Los Angeles, CA [Member] building sqft		Dec. 31, 2011 Office Properties [Member] 250 Brannan Street San Francisco, CA [Member] building sqft		Dec. 31, 2011 Office Properties [Member] 10210, 10220, and 1023 NE Points Drive; 3933 Lake Washington Boulevard NE Kirkland, WA [Member] building sqft		Dec. 31, 2011 Office Properties [Member] 10770 Wateridge Circle San Diego, CA [Member] sqft building		Dec. 31, 2011 Office Properties [Member] 601 108th Avenue N.E Bellevue, WA [Member] sqft building		Dec. 31, 2011 Office Properties [Member] 4040 Civic Center Drive San Rafael, CA [Member] sqft building		Dec. 31, 2011 Office Properties [Member] 201 Third Street San Francisco CA [Member] building sqft		Dec. 31, 2011 Office Properties [Member] 301 Brannan Street San Francisco CA [Member] sqft building		Dec. 31, 2011 Office Properties [Member] 370 Third Street, San Francisco, CA [Member]
Acquired operating properties from unrelated third parties
Date of Acquisition									Feb. 29, 2012		Jun. 01, 2012	[1]	Jun. 01, 2012				Oct. 05, 2012	[2]	Dec. 17, 2012	[3]													May 09, 2012			Jul. 20, 2012		Sep. 28, 2012			Oct. 23, 2012		Dec. 04, 2012		Dec. 17, 2012									Jul. 24, 2012	[4],[5]	Jul. 31, 2012	[6]	Jan. 28, 2011		Apr. 21, 2011	[7]	May 12, 2011		Jun. 03, 2011		Jun. 09, 2011		Sep. 15, 2011		Nov. 15, 2011		Dec. 15, 2011
Number of buildings					14		10		7		2	[1]	1				1	[2]	1	[3]									7																								24	1	[4],[5]	1	[6]	1		4	[7]	1		1		1		1		1
Rentable square feet	13,249,780	[8]			1,759,603		1,568,945		374,139		308,407	[1]	111,580				151,029	[2]	75,810	[3]																															13,249,780	[8]		416,755	[4],[5]	321,883	[6]	92,948		279,924	[7]	174,310		488,470		126,787		332,076		74,430
Percentage Occupied									84.70%		99.40%	[1]	100.00%				96.80%	[2]	100.00%	[3]																																		90.50%	[4],[5]	85.20%	[6]	100.00%		90.00%	[7]	97.50%		90.40%		98.10%		99.50%		100.00%
Purchase Price					$ 674,000,000	[9]	$ 546,300,000	[9]	$ 162,500,000	[9]	$ 105,400,000	[1],[9]	$ 39,200,000	[9]			$ 72,900,000	[2],[9]	$ 29,100,000	[3],[9]									$ 340,300,000		$ 91,500,000	[9]		$ 74,500,000	[10]		$ 18,500,000		$ 65,000,000	[11]		$ 52,000,000		$ 21,800,000			$ 108,500,000	[12]						$ 186,100,000	[4],[5],[9]	$ 78,800,000	[6],[9]	$ 33,000,000	[9]	$ 100,100,000	[7],[9]	$ 32,700,000	[9]	$ 215,000,000	[9]	$ 32,200,000	[9]	$ 103,300,000	[9]	$ 30,000,000	[9]	$ 91,500,000	[9]
Assets
Land	117,639,000	[13]	61,910,000						38,810,000	[13]					25,080,000	[13]			13,538,000	[13]			19,260,000		40,211,000	[13],[14]	42,650,000	[14]
Buildings and improvements	545,510,000	[15]	464,108,000	[15]					124,617,000	[15]					150,877,000	[15]			12,558,000	[15]	214,095,000	[15]	84,018,000	[15]	257,458,000	[14],[15]	165,995,000	[14],[15]
Undeveloped land and construction in progress			2,560,000	[16]																	0		0				2,560,000	[14],[16]	364,827,000		89,345,000														120,243,000				244,584,000
Cash and cash equivalents	3,973,000								0		4,000,000				0				0						3,973,000	[14]
Restricted cash	5,329,000								0						0				0						5,329,000	[14]			11,250,000																11,250,000	[17]			0
Deferred leasing costs and acquisition-related intangible assets	59,513,000	[18]	42,630,000	[19]					9,470,000	[18]					16,469,000	[18]			3,004,000	[18]	13,790,000	[19]	8,700,000	[19]	30,570,000	[14],[18]	20,140,000	[14],[19]			2,930,000
Prepaid expenses and other assets	184,000								0						0				0						184,000	[14]			1,300,000																0				1,300,000
Total Assets Acquired	732,148,000		571,208,000						172,897,000						192,426,000				29,100,000		227,885,000		111,978,000		337,725,000	[14]	231,345,000	[14]	377,377,000		92,275,000														131,493,000				245,884,000
Liabilities
Deferred revenue and acquisition-related intangible liabilities	35,020,000	[20]	23,940,000	[21]					10,380,000	[20]					4,940,000	[20]			0	[20]	12,850,000	[21]	8,700,000	[21]	19,700,000	[14],[20]	2,390,000	[14],[21]			730,000
Secured debt,net	221,032,000	[22]	30,997,000	[23]					0	[22]					84,984,000	[22]			0	[22]	0	[23]	0	[23]	136,048,000	[14],[22]	30,997,000	[14],[23]
Accounts payable, accrued expenses, and other liabilities	6,348,000		4,515,000						137,000		600,000				627,000				0		2,380,000		76,000		5,584,000	[14]	2,059,000	[14]	32,823,000																23,071,000	[17]			9,752,000
Total liabilities assumed	262,400,000		59,452,000						10,517,000						90,551,000				0		15,230,000		8,776,000		161,332,000	[14]	35,446,000	[14]	32,823,000		730,000														23,071,000				9,752,000
Net assets and liabilities acquired	$ 469,748,000	[24]	$ 511,756,000						$ 162,380,000	[24]					$ 101,875,000	[24]			$ 29,100,000	[24]	$ 212,655,000		$ 103,202,000		$ 176,393,000	[14],[24]	$ 195,899,000	[14]	$ 344,554,000	[25]	$ 91,545,000														$ 108,422,000	[25]			$ 236,132,000	[25]

[1] We acquired these properties through the acquisition of the ownership interest of the bankruptcy remote LLC that owned the properties. In connection with this acquisition we also acquired cash of approximately $4.0 million and other assets of approximately $0.2 million and we assumed current liabilities of approximately $0.6 million and secured debt with an outstanding principal balance of $34.0 million and a premium of $1.7 million as a result of recording the debt at fair value at the acquisition date (see Note 7).

[2] In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $40.7 million and a premium of $2.7 million as a result of recording this debt at fair value on the acquisition date (see Note 7).

[3] This operating property was acquired in connection with the purchase of the 555 N. Mathilda Ave. development property discussed in further detail in the "Development and Redevelopment Project Site" section of this footnote, for a total purchase price of $137.6 million. The acquisition of both the operating property and the development site in a single transaction constituted our third largest acquisition of 2012.

[4] In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $83.6 million and a premium of $1.4 million as a result of recordingthis debt at fair value on the acquisition date. In January 2013, we repaid this loan prior to the stated maturity (see Note 7).

[5] As of December 31, 2012, these properties were temporarily being held in separate VIEs to facilitate potential Section 1031 Exchanges (see Note 2). The VIE was terminated subsequent to year-end.

[6] As part of the consideration for this transaction, we issued 118,372 common units of the Operating Partnership valued at $47.34 per unit, which was the Company's closing stock price on the NYSE on the acquisition date. In connection with this acquisition we also assumed secured debt with an outstanding principal balance of $53.9 million and a premium of $3.1 million as a result of recording this debt at fair value on the acquisition date (see Note 7). We also assumed $4.7 million of accrued liabilities in connection with this acquisition that are not included in the purchase price above.

[7] In connection with this acquisition, we assumed secured debt with an outstanding principal balance of $30.0 million and an initial premium of $1.0 million as a result of recording this debt at fair value on the acquisition date (see Note 7).

[8] Includes square footage from our stabilized portfolio.

[9] Excludes acquisition-related costs and non-lease related accrued liabilities assumed. Includes assumed unpaid leasing commissions and tenant improvements.

[10] The total purchase price for this acquisition was comprised of a cash purchase price of $74.5 million plus $9.5 million of assumed leasing commissions and other accrued liabilities

[11] In connection with this acquisition we also assumed $1.1 million of other accrued liabilities which are not included in the purchase price above.

[12] As of December 31, 2012, this property was temporarily being held in a separate VIE to facilitate a potential Section 1031 Exchange (see Note 2).

[13] In connection with the acquisitions of 701, 801, and 837 N. 34th Street, Seattle, WA, we assumed the lessee obligations under a ground lease with an initial expiration in December 2041. The ground lease obligation contains three 10-year extension options and one 45-year extension option. In connection with the acquisitions of 601 108th Avenue N.E., Bellevue, WA, we assumed the lessee obligation under a ground lease that is scheduled to expire in November 2093 (see Note 15 for additional information pertaining to these ground leases).

[14] The purchase price of all other acquisitions during the years ended December 31, 2012 and 2011 were individually less than 5% and in aggregate less than 10% of the Company's total assets as of December 31, 2012 and 2011, respectively.

[15] Represents buildings, building improvements, and tenant improvements.

[16] Represents in-place leases (approximately $27.4 million with a weighted average amortization period of 3.8 years), above-market leases (approximately $6.8 million with a weighted average amortization period of 4.5 years years) and unamortized leasing commissions (approximately $8.5 million with a weighted average amortization period of 2.5 years)

[17] In connection with this acquisition, restricted cash is being held in escrow to pay for potential environmental costs and contingent development costs. Any unused amounts will be released to the seller.

[18] Represents in-place leases (approximately $43.4 million with a weighted average amortization period of 4.7 years), above-market leases (approximately $1.4 million with a weighted average amortization period of 3.8 years), leasing commissions (approximately $14.2 million with a weighted average amortization period of 3.4 years), and a below-market ground lease obligation (approximately $0.5 million with a weighted average amortization period of 59.6 years).

[19] Represents below-market leases (approximately $18.7 million with a weighted average amortization period of 3.9 years) and an above-market ground lease obligation (approximately $5.2 million with a weighted average amortization period of 82.5 years), under which we are the lessee.

[20] Represents below-market leases (approximately $33.9 million with a weighted average amortization period of 6.5 years) and an above-market ground lease obligation (approximately $1.1 million with a weighted average amortization period of 29.6 years).

[21] Represents the mortgage loan, which includes an unamortized premium of approximately $1.0 million at the date of acquisition, assumed in connection with the properties acquired in April 2011 (see Note 7).

[22] Represents the fair value of the mortgage loans assumed, which includes an aggregate unamortized premium balance of approximately $8.9 million at the dates of acquisition (see Note 7).

[23] Reflects the purchase price net of assumed secured debt and other lease-related obligations.

[24] Reflects the purchase price plus cash and restricted cash received, net of assumed secured debt, lease-related obligations and other accrued liabilities.

[25] Reflects the purchase price including assumed leasing commissions, net of assumed accrued liabilities.

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Employee Benefit Plans

12 Months Ended

Dec. 31, 2012

Employee Benefit Plans [Abstract]

Employee Benefit Plans

Employee Benefit Plans

401(k) Plan

We have a retirement savings plan designed to qualify under Section 401(k) of the Code (the “401(k) Plan”). Our employees are eligible to participate in the 401(k) Plan on the first day of the month after three months of service. The 401(k) Plan allows eligible employees (“401(k) Participants”) to defer up to 60% of their eligible compensation on a pre-tax basis, subject to certain maximum amounts allowed by the Code. The 401(k) Plan provides for a matching contribution by the Company in an amount equal to 50 cents of each one dollar of participant contributions up to a maximum of 10% of the 401(k) Participant’s annual salary. 401(k) Participants vest immediately in the amounts contributed by us. For each of the years ended December 31, 2012, 2011, and 2010, we contributed $0.7 million, $0.6 million, and $0.5 million, respectively, to the 401(k) Plan.

Deferred Compensation Plan

In 2007, we adopted the Deferred Compensation Plan, under which directors and certain management employees may defer receipt of their compensation, including up to 70% of their salaries and up to 100% of their director fees and bonuses, as applicable. In addition, employee participants will receive mandatory Company contributions to their Deferred Compensation Plan accounts equal to 10% of their gross monthly salaries, without regard to whether such employees elect to defer salary or bonus compensation under the Deferred Compensation Plan. Our board of directors may, but has no obligation to, approve additional discretionary contributions by the Company to Participant accounts. We hold the Deferred Compensation Plan assets in a limited rabbi trust, which is subject to the claims of our creditors in the event of bankruptcy or insolvency.

See Note 16 for further discussion of our Deferred Compensation Plan assets as of December 31, 2012 and 2011. Our liability of $7.3 million and $5.6 million under the Deferred Compensation Plan was fully funded as of December 31, 2012 and 2011, respectively.

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Schedule III - Real Estate and Accumulated Depreciation (Details) (Textuals) (USD $)	Dec. 31, 2012		Dec. 31, 2011		Apr. 30, 2011
Real Estate and Accumulated Depreciation [Line Items]
Secured Debt	$ 561,096,000		$ 351,825,000
Kilroy Realty, L.P. [Member]
Real Estate and Accumulated Depreciation [Line Items]
Secured Debt	561,096,000		351,825,000
Kilroy Realty, L.P. [Member] | Secured Debt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Secured Debt	561,096,000	[1]	351,825,000	[1]
Debt premium	8,900,000
7.15% Mortgage Payable due May 1, 2017 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Secured Debt	11,210,000	[1]	13,294,000	[1]
6.51% Mortgage Payable due February 1, 2017 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Secured Debt	68,615,000	[1]	69,507,000	[1]
5.57% Mortgage Payable due August 1, 2012 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Secured Debt	0	[1],[2]	71,517,000	[1],[2]
4.95% Mortgage Payable due August 1, 2012 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Secured Debt	0	[1],[2]	29,754,000	[1],[2]
4.27% Mortgage Payable due Feb 1, 2018 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Secured Debt	135,000,000	[1]	135,000,000	[1]
4.94% Mortgage Payable due April 15, 2015 [Member] | Kilroy Realty, L.P. [Member] | Secured Debt [Member]
Real Estate and Accumulated Depreciation [Line Items]
Secured Debt	28,941,000	[1],[3]	30,191,000	[1],[3]
Debt premium					$ 1,000,000

[1] Amounts reported include the amounts of unamortized debt premiums and discounts for the periods presented.

[2] In May 2012, we repaid these loans prior to the stated maturity.

[3] The secured debt and the related properties that secure the debt are held in a special purpose entity and the properties are not available to satisfy the debts and other obligations of the Company or the Operating Partnership.

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Secured and Unsecured Debt of the Company Secured and Unsecured Debt of the Company (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Debt Instrument [Line Items]
Unsecured Debt	$ 1,130,895,000		$ 980,569,000
Secured Debt	561,096,000		351,825,000
Kilroy Realty, L.P. [Member]
Debt Instrument [Line Items]
Unsecured Debt	1,130,895,000		980,569,000
Secured Debt	561,096,000		351,825,000
Maximum dividend payment as percentage of funds from operations	95.00%
Kilroy Realty, L.P. [Member] | Unsecured Term Loan [Member] | One Hundred Fifty Million Term Loan Facility [Member]
Debt Instrument [Line Items]
Unsecured Debt	150,000,000
Kilroy Realty, L.P. [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt			1,500,000,000
Kilroy Realty, L.P. [Member] | Unsecured Senior Notes [Member] | 6.625% Unsecured Senior Notes due June 1, 2020 [Member]
Debt Instrument [Line Items]
Unsecured Debt	248,420,000		248,207,000
Stated interest rate	6.625%	[1]
Kilroy Realty, L.P. [Member] | Unsecured Senior Notes [Member] | 4.80% Unsecured Senior Notes due July 15, 2018 [Member]
Debt Instrument [Line Items]
Unsecured Debt	324,587,000		324,514,000
Stated interest rate	4.80%	[2]
Kilroy Realty, L.P. [Member] | Unsecured Senior Notes [Member] | 5.00% Unsecured Senior Notes due Nov 3, 2015 [Member]
Debt Instrument [Line Items]
Unsecured Debt	324,888,000		324,848,000
Stated interest rate	5.00%	[3]
Kilroy Realty, L.P. [Member] | Unsecured Senior Notes [Member] | 6.45% Unsecured Senior Notes due Aug 4 2014 [Member]
Debt Instrument [Line Items]
Unsecured Debt	83,000,000
Stated interest rate	6.45%
Kilroy Realty, L.P. [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Borrowing capacity	500,000,000	[4]	500,000,000	[4]
Kilroy Realty, L.P. [Member] | Exchangeable Notes [Member]
Debt Instrument [Line Items]
Stated interest rate	4.25%
Kilroy Realty, L.P. [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Secured Debt	$ 561,096,000	[5]	$ 351,825,000	[5]

[1] Interest on the 6.625% unsecured senior notes is payable semi-annually in arrears on June 1st and December 1st of each year.

[2] Interest on the 4.800% unsecured senior notes is payable semi-annually in arrears on January 15th and July 15th of each year.

[3] Interest on the 5.000% unsecured senior notes is payable semi-annually in arrears on May 3rd and November 3rd of each year.

[4] We may elect to borrow, subject to bank approval, up to an additional $200.0 million under an accordion feature under the terms of the revolving credit facility.

[5] Amounts reported include the amounts of unamortized debt premiums and discounts for the periods presented.

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Subsequent Events

12 Months Ended

Dec. 31, 2012

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Subsequent to December 31, 2012, we repaid a $83.1 million secured mortgage loan prior to its maturity date of April 2013.

On January 14, 2013, the Operating Partnership issued unsecured senior notes in a public offering with an aggregate principal balance of $300.0 million that are scheduled to mature on January 15, 2023. The unsecured senior notes require semi-annual interest payments each January and July based on a stated annual interest rate of 3.800%. The Company used a portion of the net proceeds for general corporate purposes, including the repayment of borrowings under the revolving credit facility.

On January 15, 2013 aggregate dividends, distributions, and dividend equivalents of $26.2 million were paid to common stockholders and common unitholders of record on December 31, 2012 and RSU holders of record on January 15, 2013.

On January 16, 2013, we completed the acquisition of a 320,000 rentable square foot office project in the South Lake Union submarket of greater Seattle for a purchase price of approximately $170.0 million. The purchase price includes the assumption of approximately $83.9 million of debt secured by the project. We are currently in the process of completing the purchase price allocation for this acquisition.

On January 10, 2013, the Executive Compensation Committee granted 157,744 RSUs to the Executive Officers and other key employees under the 2006 Plan. The grant date fair value of these time-based RSUs was $7.7 million, which was based on the $48.88 closing share price of the Company's common stock on the New York Stock Exchange on the grant date, is expected to be recognized over a period of 5 years.

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Secured and Unsecured Debt of the Company

12 Months Ended

Dec. 31, 2012

Debt Disclosure [Abstract]

Secured and Unsecured Debt of the Company

Secured and Unsecured Debt of the Company

In this Note 6, the "Company" refers solely to Kilroy Realty Corporation and not to any of our subsidiaries. The Company itself does not hold any indebtedness. All of our secured and unsecured debt is held directly by the Operating Partnership.

The Company generally guarantees all the Operating Partnership's unsecured debt obligations including the unsecured revolving credit facility, the $150.0 million unsecured term loan facility, 6.625% unsecured senior notes due 2020, the 4.80% unsecured senior notes due 2018, the 5.00% unsecured senior notes due 2015, the 6.45% unsecured senior notes due 2014, and the 4.25% Exchangeable Notes. As of both December 31, 2012 and 2011, the Operating Partnership had $1.5 billion outstanding in total under these unsecured debt obligations.

In addition, although the remaining $0.6 billion and $0.4 billion of the Operating Partnership's debt for December 31, 2012 and 2011, respectively, is secured and non-recourse to the Company, the Company provides limited customary secured debt guarantees for items such as voluntary bankruptcy, fraud, misapplication of payments, and environmental liabilities.

The Company and the Operating Partnership are both named parties to the capped call option transactions discussed further in Note 7.

Debt Covenants and Restrictions

One of the covenants contained within the credit facility and the term loan facility, as discussed further below in Note 7 prohibits the Company from paying dividends in excess of 95% of funds from operations ("FFO").

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Discontinued Operations (Details 1) (USD $)	3 Months Ended																12 Months Ended															12 Months Ended
	Dec. 31, 2012 sqft		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012 sqft		Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Total Property Dispositions [Member] sqft building		Dec. 31, 2011 Total Property Dispositions [Member] building sqft		Dec. 31, 2010 Total Property Dispositions [Member] sqft building		Dec. 31, 2012 Innovation Drive and Genetic Center Drive, San Diego, CA [Member] building sqft	Dec. 31, 2012 Industrial Portfolio and Other Properties [Member] sqft building	Dec. 31, 2012 Industrial Portfolio [Member] sqft building	Dec. 31, 2012 Carmino Ruiz CA [Member] sqft building	Dec. 31, 2012 4175 E. La Palma Avenue, Anaheim, California [Member] building sqft	Dec. 31, 2011 10350 Barnes Canyon and 10120 Pacific Heights Drive San Diego CA Disposition [Member] building sqft	Dec. 31, 2011 2031 E Mariposa Avenue, Los Angeles, CA [Member] building sqft	Dec. 31, 2010 660 N Puente Street Brea CA Disposition [Member] sqft building	Dec. 31, 2010 601 Valencia Avenue Brea CA Disposition [Member] building sqft	Dec. 31, 2010 603 Valencia Avenue Brea CA Disposition [Member] building sqft	Dec. 31, 2012 Office Properties [Member] sqft		Dec. 31, 2011 Office Properties [Member]	Dec. 31, 2010 Office Properties [Member]	Dec. 31, 2012 Industrial Properties [Member]		Dec. 31, 2011 Industrial Properties [Member]		Dec. 31, 2010 Industrial Properties [Member]		Oct. 31, 2011 Mortgage Loans on Real Estate [Member] Total Property Dispositions [Member] property	Dec. 31, 2012 Restricted cash [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash Received from Divestiture of Businesses																																																$ 228,800,000
Property Type																											Office		Industrial			Office	Industrial	Industrial	Office	Office
Month of Disposition																											January		November/December			September	December	October	December	December
Number of buildings																					46		3		3		2	44	39	4	1	2	1	1	1	1
Rentable square feet	13,249,780	[1]															13,249,780	[1]			3,975,665		282,611		158,358		253,676	3,721,989	3,413,354	265,372	43,263	90,558	192,053	51,567	60,891	45,900	13,249,780	[1]
Sales Price																					500,300,000		66,100,000		15,800,000		146,100,000	354,200,000				23,900,000	42,200,000	5,000,000	5,400,000	5,400,000
Rental income																	369,516,000		307,118,000	235,304,000	22,337,000		39,226,000		39,404,000
Tenant reimbursements																	32,309,000		23,977,000	17,996,000	3,902,000		5,502,000		6,330,000
Other property income																	3,087,000		6,534,000	1,694,000	323,000		790,000		1,252,000
Total revenues																					26,562,000		45,518,000		46,986,000
Property expenses																	79,357,000		66,821,000	51,169,000	4,586,000		6,733,000		6,898,000
Real estate taxes																	34,479,000		29,633,000	23,474,000	2,779,000		4,000,000		4,020,000
Provision for bad debts																	(153,000)		(781,000)	(65,000)	195,000		137,000		1,128,000
Depreciation and amortization																	162,917,000		124,928,000	90,836,000	6,983,000		11,668,000		12,973,000
Interest expense																					0	[2]	3,624,000	[2]	4,859,000	[2]
Total expenses																					14,153,000		25,888,000		27,622,000
Income from discontinued operations before net gain on dispositions of discontinued operations																	12,409,000		19,630,000	19,364,000	12,409,000		19,630,000		19,364,000
Net gain on dispositions of discontinued operations																	259,245,000		51,587,000	949,000	259,245,000		51,587,000		949,000
Total income from discontinued operations	189,720,000	[3]	3,187,000	[3]	2,241,000	[3]	76,506,000	[3]	44,876,000	[3]	17,681,000	[3]	4,543,000	[3]	4,117,000	[3]	271,654,000		71,217,000	20,313,000	271,654,000		71,217,000		20,313,000												77,157,000		20,535,000	7,673,000	194,497,000	[4]	50,682,000	[4]	12,640,000	[4]
Principal amount																																															$ 70,000,000
Number of properties, collateral																																															13

[1] Includes square footage from our stabilized portfolio.

[2] Interest expense relates to a $70.0 million mortgage loan that was secured by 13 of our industrial properties. The mortgage loan was repaid in October 2011 prior to maturity.

[3] All periods have been adjusted from amounts previously disclosed in our quarterly filings on Form 10-Q to reclassify amounts related to discontinued operations (see Note 17).

[4] The industrial properties were no longer a segment at December 31, 2012 because we disposed of all of our industrial properties during the fourth quarter of 2012.