424B5

Filed Pursuant To Rule 424(b)(5)
Under the Securities Act of 1933
Registration No. 333-191524

On December 12, 2014, we entered into separate sales agreements with each of RBC Capital Markets, LLC, Jefferies LLC, KeyBanc Capital Markets Inc., BNP Paribas Securities Corp., J.P. Morgan Securities LLC and Barclays Capital Inc. (collectively, the “Agents”) providing for the offer and sale of shares of our common stock having an aggregate gross sales price of up to $300,000,000 from time to time through the Agents, as our sales agents, or directly to the Agents acting as principal.

Sales of the shares, if any, made through the Agents, as our sales agents, as contemplated by this prospectus supplement and the accompanying prospectus, may be made (1) by means of ordinary brokers’ transactions on the New York Stock Exchange at market prices prevailing at the time of sale, in negotiated transactions or as otherwise agreed by us, the applicable Agent and the applicable investor, (2) to or through any market maker or (3) on or through any other national securities exchange or facility thereof, trading facility of a securities association or national securities exchange, alternative trading system, electronic communication network or other similar market venue. We will pay each of the Agents a commission that will not (except as provided below) exceed, but may be lower than, 2.0% of the gross sales price per share of our common stock sold through such Agent, as our sales agent, under the applicable sales agreement. We may also agree with the applicable Agent to sell shares other than through ordinary brokers’ transactions using sales efforts and methods that may constitute “distributions” within the meaning of Rule 100 of Regulation M under the Securities Exchange Act of 1934, as amended, and for which we may agree to pay the applicable Agent a commission that may exceed 2.0% of the gross sales price.

None of the Agents is required to sell any specific number or dollar amount of shares of our common stock but each has agreed to use its reasonable efforts, as our sales agent and on the terms and subject to the conditions of the applicable sales agreement, to sell the shares offered on terms agreed upon by such Agent and us. The shares of our common stock offered and sold through the Agents, as our sales agents, pursuant to this prospectus supplement and the accompanying prospectus will be offered and sold through only one Agent on any given day.

Under the terms of the sales agreements, we may also sell shares of our common stock to any of the Agents, as principal, at a price per share to be agreed upon at the time of sale. If we sell shares to an Agent as principal, we will enter into a separate terms agreement with that Agent and we will describe the terms of the offering of those shares in a separate prospectus supplement.

Shares of our common stock are subject to certain restrictions on ownership and transfer designed to preserve our qualification as a real estate investment trust for federal income tax purposes. See “Description of Capital Stock—Restrictions on Ownership and Transfer of the Company’s Capital Stock” in the accompanying prospectus.

Our common stock is listed on the New York Stock Exchange under the symbol “KRC”. The last reported sale price of our common stock on the New York Stock Exchange on December 11, 2014 was $69.58 per share.

An investment in our common stock involves various risks and prospective investors should carefully consider the matters discussed under “Risk Factors” beginning on page S-4 of this prospectus supplement and the matters discussed in the documents incorporated by reference in this prospectus supplement and the accompanying prospectus.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus supplement or the accompanying prospectus is truthful or complete. Any representation to the contrary is a criminal offense.

Kilroy Realty Corporation, or the Company, is the sole general partner of Kilroy Realty, L.P., or the operating partnership. Unless otherwise expressly stated or the context otherwise requires, in this prospectus supplement and the accompany prospectus, “we”, “us”, and “our” refer collectively to Kilroy Realty Corporation and its subsidiaries, including the operating partnership; and references in this prospectus supplement to the operating partnership’s revolving credit facility mean the operating partnership’s current $600 million unsecured revolving credit facility and references in this prospectus supplement to the operating partnership’s term loan facilities mean the operating partnership’s current $150 million fully drawn unsecured term loan facility and up to $50 million unsecured term loan facility or, if such revolving credit facility or any such term loan facilities are amended, restated or replaced from time to time (including, without limitation, any such amendment, restatement or replacement that increases the size thereof), then references in this prospectus supplement to the operating partnership’s revolving credit facility and term loan facilities, as applicable, shall be deemed to refer to such amended, restated or replacement facility or facilities, as applicable.

You should rely only on the information contained in this prospectus supplement and the accompanying prospectus, any document incorporated or deemed to be incorporated by reference herein

and in the accompanying prospectus and any free writing prospectus that we may prepare in connection with this offering. Neither we nor the Agents have authorized anyone to provide you with any additional or different information. If anyone provides you with any additional or different information, you should not rely on it. Neither this prospectus supplement nor the accompanying prospectus nor any such free writing prospectus is an offer to sell or a solicitation of an offer to buy any securities other than the common stock to which it relates or an offer to sell or the solicitation of an offer to buy securities in any jurisdiction where, or to any person to whom, it is unlawful to make an offer or solicitation. You should not assume that the information contained in this prospectus supplement, the accompanying prospectus, any document incorporated or deemed to be incorporated by reference herein or in the accompanying prospectus or any free writing prospectus that we may prepare in connection with this offering is correct on any date after their respective dates. Our business, financial condition, liquidity, results of operations, funds from operations and prospects may have changed since those respective dates.

In the documents incorporated and deemed to be incorporated by reference in this prospectus supplement and the accompanying prospectus, we refer to information and statistics regarding, among other things, the industry, markets, submarkets and sectors in which we operate. We obtained this information and these statistics from various third-party sources and our own internal estimates. We believe that these sources and estimates are reliable, but have not independently verified them and cannot guarantee their accuracy or completeness.

PROSPECTUS SUPPLEMENT SUMMARY

This summary does not contain all the information important to you in deciding whether to invest in our common stock. You should read this entire prospectus supplement and the accompanying prospectus and the documents incorporated and deemed to be incorporated by reference herein and therein, including the financial statements and related notes, before making an investment decision.

THE COMPANY

We are a self-administered real estate investment trust, or 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.

As of September 30, 2014, our stabilized portfolio of operating properties was comprised of 105 office buildings, which encompassed an aggregate of approximately 13.5 million rentable square feet. As of September 30, 2014, these properties were approximately 94.1% occupied by 526 tenants. Our stabilized portfolio includes all of our properties with the exception of real estate assets held for sale, undeveloped land, development and redevelopment properties currently under construction or committed for construction and “lease-up” properties. We define “redevelopment properties” as those projects for which we expect to spend significant development and construction costs on the existing or acquired buildings pursuant to a formal plan, the intended result of which is higher economic return on the property. As of September 30, 2014, we had five office property developments under construction that are expected to encompass approximately 2.0 million aggregate rentable square feet upon completion and no redevelopment properties. 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. There were no operating properties in “lease-up” as of September 30, 2014.

Kilroy Realty Corporation is a Maryland corporation organized to qualify as a REIT under the Internal Revenue Code of 1986, as amended, or the Code, which owns its interests in all of its properties through Kilroy Realty, L.P., or the operating partnership, and Kilroy Realty Finance Partnership, L.P., or the finance partnership, both of which are Delaware limited partnerships. We conduct substantially all of our operations through the operating partnership in which, as of September 30, 2014, Kilroy Realty Corporation owned an approximate 97.9% general partnership interest. The remaining approximately 2.1% common limited partnership interest in the operating partnership as of September 30, 2014 was owned by non-affiliated investors and certain directors and officers of Kilroy Realty Corporation. Kilroy Realty Finance, Inc., one of Kilroy Realty Corporation’s wholly-owned subsidiaries, 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 in the finance partnership. We conduct substantially all of our development activities through Kilroy Services, LLC, or KSLLC, which is a wholly-owned subsidiary of the operating partnership. With the exception of the operating partnership and Redwood City Partners, LLC, a subsidiary that we formed to pursue a development project, as of September 30, 2014, all of the beneficial ownership interests in Kilroy Realty Corporation’s subsidiaries were wholly-owned directly or indirectly by Kilroy Realty Corporation and the operating partnership.

The Company’s outstanding common stock and preferred stock are listed on the New York Stock Exchange. The Company’s common stock is listed under the symbol “KRC,” the Company’s 6.875% Series G Cumulative Redeemable Preferred Stock, or the Series G preferred stock, is listed under the symbol “KRC-PRG,” and the Company’s 6.375% Series H Cumulative Redeemable Preferred Stock, or the Series H preferred stock, is listed under the symbol “KRC-PRH.”

Our principal executive offices are located at 12200 West Olympic Boulevard, Suite 200, Los Angeles, California 90064. Our telephone number is (310) 481-8400.

THE OFFERING

Issuer

Kilroy Realty Corporation, a Maryland corporation

Common stock to be offered by us

Shares with an aggregate gross sales price of up to $300,000,000.

Use of proceeds

Restrictions on ownership and transfer

Shares of our common stock are subject to certain restrictions on ownership and transfer designed to preserve our qualification as a REIT for federal income tax purposes. See “Description of Capital Stock—Restrictions on Ownership and Transfer of the Company’s Capital Stock” in the accompanying prospectus.

NYSE Listing

Our common stock is listed on the New York Stock Exchange under the symbol “KRC”.

Risk factors

An investment in our common stock involves various risks and prospective investors should carefully consider the matters discussed under the caption entitled “Risk Factors” beginning on page S-4 of this prospectus supplement and under the captions entitled “Risk Factors” in our and the operating partnership’s most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q (in each case including any amendments thereto), which are incorporated by reference in this prospectus supplement and the accompanying prospectus, as well as the other risks described in the documents incorporated and deemed to be incorporated by reference in this prospectus supplement and the accompanying prospectus before making a decision to invest in our common stock.

Transfer Agent and Registrar

Computershare, Inc.

We have reserved shares of our common stock for issuance upon the exercise of stock options and restricted stock units granted under our equity compensation plans, for issuance under our equity compensation plans, for issuance upon exchange of common units of limited partnership interest of the operating partnership as described

in the accompanying prospectus under “Description of Material Provisions of the Partnership Agreement of Kilroy Realty, L.P.—Common Limited Partnership Units—Redemption/Exchange Rights” and for potential issuance upon conversion of our Series G preferred stock and Series H preferred stock following a “Change of Control” (as defined in the terms of the Series G preferred stock and Series H preferred stock, respectively) of us. All of the foregoing shares, in addition to shares held by certain stockholders, have been or will be registered under the Securities Act of 1933 and, if and when issued or sold, will therefore generally be freely tradable in the public markets. For additional information, please see our and the operating partnership’s most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q (in each case including any amendments thereto) and the description of our Series G preferred stock and Series H preferred stock contained in our Registration Statements on Form 8-A filed with the Securities and Exchange Commission, or the SEC, on March 22, 2012 and August 10, 2012, respectively (in each case including any subsequently filed amendments and reports filed for the purpose of updating such descriptions), all of which are incorporated by reference in this prospectus supplement and the accompanying prospectus.

Investing in our common stock involves risks. Before acquiring any common stock pursuant to this prospectus supplement and the accompanying prospectus, you should carefully consider the information contained in this prospectus supplement, the accompanying prospectus, the documents incorporated or deemed to be incorporated by reference in each and any free writing prospectus that we may prepare in connection with this offering, including, without limitation, the risks of an investment in our common stock described below and under the captions “Item 1A. Risk Factors” and “Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our and the operating partnership’s most recent Annual Report on Form 10-K and any amendments thereto filed with the SEC, under the captions “Item 1A. Risk Factors” and “Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations” in our and the operating partnership’s subsequent Quarterly Reports on Form 10-Q and any amendments thereto filed with the SEC and as described in our other filings with the SEC. The occurrence of any of these risks could materially and adversely affect our business, financial condition, liquidity, results of operations, funds from operations and prospects, as well as the trading price of our common stock, and might cause you to lose all or a part of your investment in our common stock. Please also refer to the sections “Forward-Looking Statements” in this prospectus supplement and in our and the operating partnership’s most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q (in each case including any amendments thereto).

This offering could be dilutive, and there may be future dilution of our common stock.

Giving effect to the issuance of common stock in this offering, the receipt of the expected net proceeds and the use of those net proceeds, we expect that this offering could have a dilutive effect on our expected earnings per share and funds from operations per share. Additional issuances of our common stock, including in connection with acquisitions, if any, could also be dilutive to our earnings per share and funds from operations per share. The issuance or sale of our common stock, including the sale of shares in this offering, in connection with acquisitions, if any, or in the secondary market (including upon the conversion, exchange or exercise of our outstanding convertible, exchangeable or exercisable securities, upon redemption of outstanding common units of limited partnership interest of the operating partnership and upon the exercise of options and other awards granted under our equity compensation plans), or the perception that such additional issuances or sales could occur, could also adversely affect the trading price of our common stock and our ability to raise capital through future offerings of equity or equity-related securities. In addition, if we are unable to apply the net proceeds from this offering to make investments in properties that generate sufficient revenues to offset the dilutive impact of the issuance of common stock in this offering, there will be further dilution of our earnings per share and funds from operations per share.

The trading price of our common stock may fluctuate significantly in response to many factors, including:

Many of the factors listed above are beyond our control. These factors may cause the trading price of our common stock to decline, regardless of our financial performance and condition and prospects. It is impossible to provide any assurance that the trading price of our common stock or the amount of dividends we pay on our common stock will not fall in the future, and it may be difficult for holders to resell shares of our common stock at prices they find attractive, or at all.

The covenants in the operating partnership’s revolving credit facility and term loan facilities may limit our ability to make distributions to the holders of our common stock.

The operating partnership’s unsecured revolving credit facility and unsecured term loan facilities 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 term loan facilities 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:

In addition, the agreements governing the revolving credit facility and term loan facilities each provides that, if the operating partnership fails to pay any principal of or interest on any borrowings or other amounts payable under such agreement when due, then the operating partnership may make only those partnership distributions that result in distributions to us in an amount sufficient to permit 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 and the term loan facilities or otherwise, could have a material adverse effect on the market value of our common stock.

Our ability to make payments on and to refinance our indebtedness and to fund our operations, working capital and capital expenditures, depends on our ability to generate cash in the future. Our cash flow is subject to general economic, industry, financial, competitive, operating, legislative, regulatory and other factors, many of which are beyond our control.

The instruments and agreements governing some of our outstanding indebtedness (including borrowings under the operating partnership’s revolving credit facility and term loan facilities) contain provisions that require us to repurchase for cash or repay that indebtedness under specified circumstances or upon the occurrence of specified events (including certain changes of control of the Company) and our future debt agreements and debt securities may contain similar provisions or may require that we offer to repurchase the applicable indebtedness for cash under specified circumstances or upon the occurrence of specified events. We may not have sufficient funds to pay our indebtedness when due (including upon any such required repurchase, repayment or offer to repurchase), and we may not be able to arrange for the financing necessary to make those payments on favorable terms or at all. In addition, our ability to make required payments on our indebtedness when due (including upon any such required repurchase, repayment or offer to repurchase) may be limited by the terms of other debt instruments or agreements. Our failure to pay amounts due in respect of any of our indebtedness when due may constitute an event of default under the instrument governing that indebtedness, which could permit the holders of that indebtedness to require the immediate repayment of that indebtedness in full and, in the case of secured indebtedness, could allow them to sell the collateral securing that indebtedness and use the proceeds to repay that indebtedness. Moreover, any acceleration of or default in respect of any of our indebtedness could, in turn, constitute an event of default under other debt instruments or agreements, thereby resulting in the acceleration and required repayment of that other indebtedness.

We cannot assure you that our business will generate sufficient cash flow from operations or that future sources of cash will be available to us in an amount sufficient to enable us to pay amounts due on our indebtedness or to fund our other liquidity needs. Additionally, if we incur additional indebtedness in connection with future acquisitions or for any other purpose, our debt service obligations could increase.

We may need to refinance all or a portion of our indebtedness on or before maturity. Our ability to refinance our indebtedness or obtain additional financing will depend on, among other things:

As a result, we may not be able to refinance our indebtedness on commercially reasonable terms, or at all. If we do not generate sufficient cash flow from operations, and additional borrowings or refinancings or proceeds of asset sales or other sources of cash are not available to us, we may not have sufficient cash to enable us meet all of our obligations. Accordingly, if we cannot service our indebtedness, we may have to take actions such as seeking additional equity financing, delaying capital expenditures, or strategic acquisitions and alliances. Any of these events or circumstances could have a material adverse effect on our financial condition, results of operations, cash flows, the trading price of our common stock and our ability to satisfy our debt service obligations and to pay distributions to our stockholders and unitholders.

The market price of our common stock may be adversely affected by future offerings of debt and equity securities by the operating partnership, which would be structurally senior to our common stock for purposes of interest and principal payments on those debt securities and distributions on those equity securities and, in each case, distributions upon our liquidation, and future offerings of debt securities and preferred stock by us, which would be senior to our common stock for purposes of interest and principal payments on those debt securities and dividend distributions on such preferred stock, and, in each case, distributions upon our liquidation.

In the future, we may increase our capital resources by making offerings of our debt securities and preferred stock and the operating partnership’s debt securities and equity securities and by our or the operating partnership’s other borrowings. Upon our liquidation, dissolution or winding-up, holders of these debt securities, our preferred stock and operating partnership’s equity securities, and lenders with respect to those other borrowings by us and the operating partnership, will be entitled to receive distributions of our available assets prior to the holders of our common stock and it is possible that, after making distributions on these other securities and borrowings, no assets would be available for distribution to holders of our common stock. In addition, the operating partnership’s debt and equity securities and borrowings are structurally senior to our common stock, our debt securities and borrowings are senior in right of payment to our common stock, and our outstanding preferred stock has and any preferred stock we may issue in the future may have a preference over our common stock, and all payments (including dividends, principal and interest) and liquidating distributions on such securities and borrowings could limit our ability to pay dividends or make other distributions to the holders of our common stock. Because any decision to issue securities and make borrowings in the future will depend on market conditions and other factors, some of which may be beyond our control, we cannot predict or estimate the amount, timing or nature of our or the operating partnership’s future offerings or borrowings. Thus, holders of our common stock bear the risk of such future offerings or borrowings reducing the market price of our common stock.

A downgrade in our credit ratings could materially adversely affect our business and financial condition.

The credit ratings assigned to the operating partnership’s debt securities 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 operating partnership’s debt securities 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.

This prospectus supplement and the accompanying prospectus, including the documents incorporated by reference in each, contain, and documents we subsequently file with the SEC and incorporate by reference in each may contain, certain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended (referred to as the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (referred to as the “Exchange Act”), including information concerning our capital resources, portfolio performance, results of operations, projected future occupancy and rental rates, lease expirations, debt maturities, potential investments, strategies such as capital recycling, development and redevelopment activity, projected construction costs, projected construction commencement and completion dates, dispositions, future incentive compensation, pending, potential or proposed acquisitions, the anticipated use of proceeds from this offering, anticipated growth in our funds from operations and anticipated market conditions, demographics, and similar matters. 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 events. Numerous factors could cause actual future performance, results and events to differ materially from those indicated in the forward-looking statements, including, among others:

The risk factors included in this prospectus supplement and the accompanying prospectus, including the documents incorporated by reference in each, and documents we subsequently file with the SEC and incorporate by reference in each, 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 under the caption “Risk Factors” in this prospectus supplement, in the accompanying prospectus, in our and the operating partnership’s most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q (in each case including any amendments thereto), as well as the other risks described in this prospectus supplement and the accompanying prospectus and the documents incorporated by reference in each. All forward-looking statements are based on information that was available, and speak only, as of the date on which they were made. 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.

We intend to use the net proceeds from this offering for general corporate purposes, which may include acquiring properties, funding development and redevelopment projects and repaying indebtedness, which may include borrowings under the operating partnership’s revolving credit facility and term loan facilities. Pending application of the net proceeds for those purposes, we may temporarily invest such net proceeds in marketable securities. As of November 30, 2014, we had borrowings of $125 million outstanding under the revolving credit facility and borrowings of $150 million outstanding under the fully drawn unsecured term loan facility. The revolving credit facility matures in 2019 and, as of September 30, 2014, bore interest at a rate equal to the London Interbank Offered Rate, or LIBOR, plus 1.25%, and this term loan facility matures in 2019 and, as of September 30, 2014, bore interest at a rate equal to LIBOR plus 1.40%. Proceeds from borrowings under the revolving credit facility and this term loan facility were applied for general corporate purposes, including acquiring properties, funding development and redevelopment projects and repaying other indebtedness. Any borrowings under the revolving credit facility that are repaid with net proceeds from this offering may be reborrowed, subject to customary conditions.

Affiliates of all but one of the Agents are lenders and, in certain cases, co-documentation agents, an affiliate of J.P. Morgan Securities LLC is the administrative agent, and J.P. Morgan Securities LLC is a joint lead arranger and joint bookrunner, under the operating partnership’s revolving credit facility and term loan facilities. Because affiliates of all but one of the Agents are lenders under the revolving credit facility and the term loan facilities, to the extent that net proceeds from this offering are applied to repay borrowings under the revolving credit facility or term loan facilities, such affiliates will receive proceeds of this offering through the repayment of those borrowings. Likewise, to the extent that net proceeds from this offering are applied to repay any other indebtedness of the Company, the operating partnership or any of the Company’s other subsidiaries that may be held by any of the Agents or any of their respective affiliates, such Agents or affiliates, as the case may be, will receive proceeds of this offering through the repayment of those borrowings. The amount received by any Agent and its affiliates, as applicable, from the repayment, if any, of those borrowings may exceed 5% of the proceeds of this offering (not including the Agents’ discounts, if any, and commissions). Nonetheless, in accordance with Rule 5121 of the Financial Industry Regulatory Authority Inc., or FINRA, the appointment of a qualified independent underwriter is not necessary in connection with this offering because REITs are excluded from that requirement.

The discussion appearing under the caption “United States Federal Income Tax Considerations” in the accompanying prospectus has been supplemented and, in certain cases, superseded, by the discussion appearing in Exhibit 99.1 to our and the operating partnership’s Current Report on Form 8-K filed with the SEC on December 12, 2014 with respect to certain supplemental United States federal income tax considerations (the “December 12 Form 8-K”) and incorporated by reference in this prospectus supplement and the accompanying prospectus. Exhibit 99.1 to the December 12 Form 8-K also supersedes the discussion of certain supplemental United States federal income tax considerations in Exhibit 99.1 to our and the operating partnership’s Current Report on Form 8-K filed with the SEC on July 30, 2014. We may in the future file additional Current Reports on Form 8-K with the SEC that are incorporated by reference in this prospectus supplement and the accompanying prospectus and that further supplement and, if applicable, supersede the discussion appearing under the caption “United States Federal Income Tax Considerations” in the accompanying prospectus and that may also supplement and, if applicable, supersede the discussion appearing in Exhibit 99.1 to the December 12 Form 8-K and/or the discussion of United States federal income tax considerations set forth in other documents that we have filed with the SEC and that are incorporated by reference in this prospectus supplement and the accompanying prospectus. Prospective investors should carefully review the discussion in Exhibit 99.1 to the December 12 Form 8-K, as well as the other information included and incorporated by reference in this prospectus supplement and the accompanying prospectus, before acquiring any common stock pursuant to this prospectus supplement and the accompanying prospectus.

On December 12, 2014, the Company and the operating partnership entered into separate sales agreements with each of RBC Capital Markets, LLC, Jefferies LLC, KeyBanc Capital Markets Inc., BNP Paribas Securities Corp., J.P. Morgan Securities LLC and Barclays Capital Inc., providing for the offer and sale of shares of our common stock having an aggregate gross sales price of up to $300,000,000 from time to time through the Agents, as our sales agents, or directly to the Agents acting as principal.

The sales, if any, of common stock made through the Agents, as our sales agents, may be made (1) by means of ordinary brokers’ transactions on the New York Stock Exchange at market prices prevailing at the time of sale, in negotiated transactions or as otherwise agreed with us, the applicable Agent and the applicable investor, (2) to or through any market maker or (3) on or through any other national securities exchange or facility thereof, trading facility of a securities association or national securities exchange, alternative trading system, electronic communication network or other similar market venue.

Upon its acceptance of instructions from us, each Agent has agreed to use its reasonable efforts to sell shares of our common stock, as our sales agent, on the terms and subject to the conditions set forth in the applicable sales agreement. We will instruct each Agent as to the amount of common stock to be sold by it as our sales agent. We may instruct an Agent not to sell our common stock as our sales agent if the sales cannot be effected at or above a price designated by us. Our common stock offered and sold through the Agents, as our sales agents, pursuant to the sales agreements will be offered and sold through only one of the Agents on any given day. We or any of the Agents may suspend the offering of common stock by such Agent, as our sales agent, upon notice to the other party.

Each Agent will provide written confirmation to us following the close of trading on the New York Stock Exchange on each day on which shares of our common stock are sold by it, as our sales agent, under the sales agreement to which it is a party. Each confirmation will include the number of shares of common stock sold on that day, the gross sales price per share, the aggregate gross sales price of the shares of common stock sold, the net proceeds to us and the compensation payable by us to such Agent in connection with the sales. We will report at least quarterly the number of shares of common stock sold through the Agents, as our sales agents, under the sales agreements, the net proceeds to us (before expenses) and the compensation paid by us to the Agents in connection with those sales of the common stock.

We will pay each Agent a commission that will not (except as provided below) exceed, but may be lower than, 2.0% of the gross sales price per share of our common stock sold through such Agent, as our sales agent, under the sales agreement to which it is a party. We may also agree with the applicable Agent to sell shares other than through ordinary brokers’ transactions using sales efforts and methods that may constitute “distributions” within the meaning of Rule 100 of Regulation M under the Securities Exchange Act of 1934, as amended, and for which we may agree to pay the applicable Agent a commission that may exceed 2.0% of the gross sales price. We estimate that the total expenses payable by us in connection with the offering and sale of shares of our common stock pursuant to the sales agreements, excluding commissions and discounts payable to the Agents, will be approximately $200,000. The remaining sales proceeds from the sale of any such shares, after deducting any transaction fees, transfer taxes or similar charges imposed by any governmental or self-regulatory organization in connection with the sales, will be our net proceeds for the sale of the common stock offered by this prospectus supplement and the accompanying prospectus.

Settlement for sales of our common stock will occur on the third business day (or on such other date as may be agreed upon by us and the applicable Agent) following the respective dates on which any such sales are made in return for payment of the net proceeds to us. There is no arrangement for funds to be received in an escrow, trust or similar arrangement.

The offering of shares of our common stock pursuant to the sales agreements will terminate upon the earlier of (1) the sale of shares of our common stock having an aggregate gross sales price of $300,000,000 pursuant to the sales agreements and (2) the termination of all of the sales agreements by us or the Agents.

We have agreed to provide indemnification and contribution to the Agents against certain liabilities, including liabilities under the Securities Act.

The Agents have determined that our common stock is an “actively-traded security” excepted from the requirements of Rule 101 of Regulation M under the Securities Exchange Act of 1934, as amended, or the Exchange Act, by Rule 101(c)(1) of Regulation M. If an Agent or we has reason to believe that the exemptive provisions set forth in Rule 101(c)(1) of Regulation M under the Exchange Act are not satisfied, that party will promptly notify the other party and sales of common stock under the sales agreements will be suspended until that or other exemptive provisions have been satisfied in the judgment of the Agents and us.

Affiliates of all but one of the Agents are lenders and, in certain cases, co-documentation agents, an affiliate of J.P. Morgan Securities LLC is the administrative agent, and J.P. Morgan Securities LLC is a joint lead arranger and joint bookrunner, under the operating partnership’s revolving credit facility and term loan facilities. As described in this prospectus supplement under “Use of Proceeds,” net proceeds of this offering may be used to repay borrowings under the revolving credit facility and term loan facilities. Because affiliates of all but one of the Agents are lenders under the revolving credit facility and the term loan facilities, to the extent that net proceeds from this offering are applied to repay borrowings under the revolving credit facility or term loan facilities, such affiliates will receive proceeds of this offering through the repayment of those borrowings. Likewise, to the extent that net proceeds from this offering are applied to repay any other indebtedness of the Company, the operating partnership or any of the Company’s other subsidiaries that may be held by any of the Agents or any of their respective affiliates, such Agents or affiliates, as the case may be, will receive proceeds of this offering through the repayment of those borrowings. The amount received by any Agent and its affiliates, as applicable, from the repayment, if any, of those borrowings may exceed 5% of the proceeds of this offering (not including the Agents’ discounts, if any, and commissions). Nonetheless, in accordance with Rule 5121 of FINRA, the appointment of a qualified independent underwriter is not necessary in connection with this offering because REITs are excluded from that requirement.

In addition to the matters discussed above under “—Conflicts of Interest,” some or all of the Agents and/or their affiliates have engaged in, and/or may in the future engage in, investment banking, commercial banking, financial advisory and other commercial dealings in the ordinary course of business with us and the operating partnership. They have received and in the future may receive fees and commissions for these transactions.

In addition, in the ordinary course of their various business activities, the Agents and their respective affiliates may make or hold a broad array of investments and actively trade debt and equity securities (or related derivative securities) and financial instruments (including bank loans) for their own account and for the accounts of their customers and such investment and securities activities may involve securities and/or instruments of ours or the operating partnership. Certain of the Agents or their affiliates that may have lending relationship with us or the operating partnership may also choose to hedge their credit exposure to us or the operating partnership, as the case may be, consistent with their customary risk management policies. Typically those Agents and their

affiliates would hedge such exposure by entering into transactions, which may consist of either the purchase of credit default swaps or the creation of short positions in securities of us or the operating partnership. The Agents and their respective affiliates may also make investment recommendations and/or publish or express independent research views in respect of securities or financial instruments of ours or the operating partnership and may at any time hold, or recommend to clients that they acquire, long and/or short positions in such securities and instruments.

No action has been taken in any jurisdiction (except in the United States) that would permit a public offering of the shares of common stock, or the possession, circulation or distribution of this prospectus supplement, the accompanying prospectus or any other material relating to us or the shares, where action for that purpose is required. Accordingly, the shares may not be offered or sold, directly or indirectly, and neither this prospectus supplement, the accompanying prospectus nor any other offering material or advertisements in connection with the shares may be distributed or published, in or from any other country or jurisdiction except in compliance with any applicable rules and regulations of any such country or jurisdiction.

The SEC allows us to “incorporate by reference” the information we file with the SEC, which means that we can disclose important information to you by referring to those documents. The information incorporated by reference is an important part of this prospectus supplement and the accompanying prospectus. Any statement contained in this prospectus supplement, the accompanying prospectus or a document which is incorporated by reference in this prospectus supplement or the accompanying prospectus is automatically updated and superseded if information contained in this prospectus supplement or the accompanying prospectus, or information that we later file with the SEC prior to the termination of this offering that is incorporated by reference or deemed to be incorporated by reference in each, as the case may be, modifies or replaces this information. We incorporate by reference the following documents we filed with the SEC:

We are also incorporating by reference any additional documents that we file with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act on or after the date of this prospectus supplement and before the termination of this offering. We are not, however, incorporating by reference any documents or portions thereof or exhibits thereto, whether specifically listed above or filed in the future, that are deemed to have been “furnished to,” rather than “filed” with, the SEC, including our compensation committee report and performance graph included or incorporated by reference in any Annual Report on Form 10-K or Form 10-K/A or proxy statement, or any information or related exhibits furnished pursuant to Items 2.02 or 7.01 of Form 8-K, or any exhibits filed pursuant to Item 9.01 of Form 8-K that are not deemed “filed” with the SEC.

To receive a free copy of any of the documents incorporated by reference in this prospectus supplement and the accompanying prospectus, including exhibits, if they are specifically incorporated by reference in the documents, call or write Kilroy Realty Corporation, 12200 West Olympic Boulevard, Suite 200, Los Angeles, California 90064, Attention: Secretary (telephone (310) 481-8400).

Certain legal matters in connection with this offering will be passed upon for us by Latham & Watkins LLP, Los Angeles, California. Certain legal matters relating to Maryland law, including the validity of the issuance of the shares of common stock offered by this prospectus supplement and the accompanying prospectus will be passed upon for us by Ballard Spahr LLP, Baltimore, Maryland. Sidley Austin LLP, San Francisco, California, will act as counsel to the Agents.

The financial statements, and the related financial statement schedules, incorporated in this prospectus supplement by reference from Kilroy Realty Corporation’s and Kilroy Realty, L.P.’s Annual Reports on Form 10-K and Form 10-K/A for the year ended December 31, 2013, and the effectiveness of Kilroy Realty Corporation’s and Kilroy Realty, L.P.’s internal control over financial reporting have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated herein by reference. Such financial statements and financial statement schedules have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

We may offer from time to time in one or more series or classes (i) debt securities of Kilroy Realty, L.P. which may be fully and unconditionally guaranteed by Kilroy Realty Corporation, (ii) shares of Kilroy Realty Corporation’s common stock, par value $.01 per share, (iii) shares or fractional shares of Kilroy Realty Corporation’s preferred stock, par value $.01 per share, (iv) shares of Kilroy Realty Corporation’s preferred stock represented by depositary shares and (v) warrants to purchase preferred stock or common stock, referred to collectively in this prospectus as the offered securities, separately or together, in separate series in amounts, at prices and on terms to be set forth in one or more supplements to this prospectus.

The specific terms of the offered securities with respect to which this prospectus is being delivered will be set forth in the applicable prospectus supplement, along with any applicable modifications of or additions to the general terms of the debt securities as described in this prospectus, and will include, where applicable (i) in the case of debt securities and, as applicable, related guarantees, the specific terms of such debt securities, which may be either senior or subordinated, secured or unsecured, and related guarantees, (ii) in the case of common stock, the specific title and any initial public offering price; (iii) in the case of preferred stock, the specific title and any dividend, liquidation, redemption, conversion, voting and other rights and any initial public offering price; (iv) in the case of depositary shares, the fractional or multiple shares of preferred stock represented by each such depositary share; and (v) in the case of warrants, the duration, offering price, exercise price and detachability. In addition, such specific terms may include limitations on actual or constructive ownership and restrictions on transfer of the offered securities, in each case as may be appropriate to preserve Kilroy Realty Corporation’s status as a real estate investment trust, or REIT, for federal income tax purposes.

The applicable prospectus supplement will also contain information, where applicable, about (i) certain United States federal income tax consequences relating to, and (ii) any listing on a securities exchange of, the offered securities covered by such prospectus supplement.

The securities may be offered directly, through agents we may designate from time to time or by, to or through underwriters or dealers. The securities also may be offered by securityholders, if so provided in a prospectus supplement hereto. We will provide specific information about any selling securityholders in one or more supplements to this prospectus. If any agents or underwriters are involved in the sale of any of the offered securities, their names, and any applicable purchase price, fee, commission or discount arrangement between or among them, will be set forth in, or will be calculable from the information set forth in, the applicable prospectus supplement. See “Plan of Distribution.” No offered securities may be sold without delivery of this prospectus and the applicable prospectus supplement describing the method and terms of the offering of such series of offered securities.

Kilroy Realty Corporation’s common stock is listed on the New York Stock Exchange, or NYSE, under the symbol “KRC.” On September 30, 2013, the last reported sales price of Kilroy Realty Corporation’s common stock on the NYSE was $49.95 per share.

Before you invest in the offered securities, you should consider the risks discussed in “Risk Factors” on page 1.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the accuracy or completeness of this prospectus. Any representation to the contrary is a criminal offense.

Kilroy Realty, L.P., or the operating partnership, is a Delaware limited partnership. Kilroy Realty Corporation, or the Company or guarantor, is the sole general partner of the operating partnership. Unless otherwise expressly stated or the context otherwise requires, in this prospectus, “we,” “us” and “our” refer collectively to the Company, the operating partnership and the Company’s other subsidiaries, references to “Company common stock,” “common stock” or similar references refer to the common stock, par value $.01 per share, of the Company, references to “Company preferred stock,” “preferred stock” or similar references refer to the preferred stock, par value $.01 per share, of the Company and references to “common units” or similar references refer to the common units of the operating partnership.

You should rely only on the information contained in this prospectus, the applicable prospectus supplement and in any document incorporated by reference. We have not authorized anyone to provide you with information or make any representation that is different. If anyone provides you with different or inconsistent information, you should not rely on it. This prospectus and the applicable prospectus supplement are not an offer to sell or a solicitation of an offer to buy any securities other than the registered securities to which they relate, and this prospectus and the applicable prospectus supplement are not an offer to sell or the solicitation of an offer to buy securities in any jurisdiction where, or to any person to whom, it is unlawful to make an offer or solicitation. You should not assume that the information contained in this prospectus and the applicable prospectus supplement is correct on any date after the date of this prospectus or the date of the applicable prospectus supplement even though this prospectus and the applicable prospectus supplement are delivered or securities are sold pursuant to this prospectus and the applicable prospectus supplement at a later date. Since the date of this prospectus and the date of the applicable prospectus supplement, our business, financial condition, results of operations and prospects may have changed.

Investment in the offered securities involves risks. Before acquiring any offered securities pursuant to this prospectus, you should carefully consider the information contained or incorporated by reference in this prospectus, in the applicable prospectus supplement or in any free writing prospectus that we may prepare in connection with the offered securities, including, without limitation, the risks of an investment in our Company under the captions “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations” (or similar captions) in Kilroy Realty Corporation’s and Kilroy Realty, L.P.’s most recent Annual Report on Form 10-K and subsequent Quarterly Reports on Form 10-Q, incorporated into this prospectus and the applicable prospectus supplement by reference, as updated in subsequent filings of Kilroy Realty Corporation and Kilroy Realty, L.P. with the Securities and Exchange Commission, or the SEC, under the Securities Exchange Act of 1934, as amended, or the Exchange Act, that are incorporated by reference herein. The occurrence of any of these risks could materially and adversely affect our business, financial condition, liquidity, results of operations, funds from operations and prospects, and might cause you to lose all or a part of your investment in the offered securities. Please also refer to the section entitled “Forward-Looking Statements” included elsewhere in this prospectus and the applicable prospectus supplement.

This prospectus and the applicable prospectus supplement, including the documents incorporated by reference in each, contain, and documents we subsequently file with the SEC and incorporate by reference in each may contain, certain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, or Securities Act, and Section 21E of the Exchange Act, including information concerning our capital resources, portfolio performance, results of operations, projected future occupancy and rental rates, lease expirations, debt maturities, potential investments, strategies such as capital recycling, development and redevelopment activity, projected construction costs, dispositions, future executive incentive compensation, pending, potential or proposed acquisitions, the anticipated use of proceeds from any offered securities, anticipated growth in our funds from operations and anticipated market conditions, demographics, and similar matters. 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 events. Numerous factors could cause actual future performance, results and events to differ materially from those indicated in the forward- looking statements, including, among others:

The factors included in this prospectus and the applicable prospectus supplement, including the documents incorporated by reference in each, and documents we subsequently file with the SEC and incorporate by reference in each, 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 under the caption “Risk Factors” in this prospectus, in the applicable prospectus supplement, in our and the operating partnership’s most recent Annual Report on Form 10-K, and in our and the operating partnership’s subsequent Quarterly Reports on Form 10-Q, as well as the other risks described in this prospectus and the applicable prospectus supplement and the documents incorporated by reference in each. All forward-looking statements are based on information that was available, and speak only, as of the date on which they were made. 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.

Kilroy Realty Corporation’s (i) consolidated ratio of earnings to fixed charges and (ii) consolidated ratio of earnings to combined fixed charges and preferred dividends for each of the periods indicated was as follows:

Kilroy Realty, L.P.’s consolidated ratio of earnings to fixed charges for each of the periods indicated was as follows:

We have computed the consolidated ratio of earnings to fixed charges for Kilroy Realty Corporation 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 capitalized interest, reduced by capitalized interest and loan costs and distributions on Series A cumulative redeemable preferred units prior to their redemption on August 15, 2012. 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 for Kilroy Realty Corporation 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 prior to their redemption on August 15, 2012. 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 prior to their redemption on August 15, 2012.

We have computed the consolidated ratio of earnings to fixed charges for Kilroy Realty, L.P. 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 capitalized interest, 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.

We are a self-administered real estate investment trust, or REIT, active in office submarkets along the West Coast. We own, develop, acquire and manage real estate assets, consisting primarily of Class A real estate 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.

As of June 30, 2013, our stabilized portfolio of operating properties was comprised of 115 office buildings, which encompassed an aggregate of approximately 13.5 million rentable square feet. As of June 30, 2013, these properties were approximately 90.7% occupied by 545 tenants. 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 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 higher economic return on the property. As of June 30, 2013, we had five office property developments under construction that are expected to encompass approximately 1.5 million aggregate rentable square feet upon completion. 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 June 30, 2013, we had two “lease-up” properties, which encompassed an aggregate of approximately 508,000 rentable square feet.

Kilroy Realty Corporation is a Maryland corporation organized to qualify as a REIT under the Internal Revenue Code of 1986, as amended, or the Code, which owns its interests in all of its properties through Kilroy Realty, L.P., or the operating partnership, and Kilroy Realty Finance Partnership, L.P., or the finance partnership, both of which are Delaware limited partnerships. We conduct substantially all of our operations through the operating partnership in which, as of June 30, 2013, Kilroy Realty Corporation owned an approximate 97.7% general partnership interest. The remaining approximately 2.3% common limited partnership interest in the operating partnership as of June 30, 2013 was owned by non-affiliated investors and certain directors and officers of Kilroy Realty Corporation. Kilroy Realty Finance, Inc., one of Kilroy Realty Corporation’s wholly-owned subsidiaries, 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 in the finance partnership. We conduct substantially all of our development activities through Kilroy Services, LLC, or KSLLC, which is a wholly-owned subsidiary of the operating partnership. With the exception of the operating partnership and Redwood City Partners, LLC, a newly organized subsidiary that we formed to pursue a development project, as of June 30, 2013, all of the beneficial ownership interests in Kilroy Realty Corporation’s subsidiaries were wholly-owned directly or indirectly by Kilroy Realty Corporation and the operating partnership.

The Company’s outstanding common stock and preferred stock are listed on the NYSE. The Company’s common stock is listed under the symbol “KRC,” the Company’s 6.875% Series G Cumulative Redeemable Preferred Stock is listed under the symbol “KRC-PRG,” and the Company’s 6.375% Series H Cumulative Redeemable Preferred Stock is listed under the symbol “KRC-PRH.”

Our principal executive offices are located at 12200 West Olympic Boulevard, Suite 200, Los Angeles, California 90064. Our telephone number is (310) 481-8400.

The Company, as general partner of the operating partnership, is required under the terms and conditions of the operating partnership’s partnership agreement to contribute the net proceeds of any sale of common stock, preferred stock, depositary shares or warrants pursuant to this prospectus to the operating partnership. Unless otherwise indicated in the applicable prospectus supplement, the operating partnership intends to use the contributed net proceeds from sales of securities by the Company and any net proceeds from any sale of the operating partnership’s debt securities pursuant to this prospectus and the applicable prospectus supplement for general corporate purposes, which may include acquiring properties (including office properties and undeveloped land), funding development and redevelopment projects and repaying indebtedness, which may include borrowings under the operating partnership’s revolving credit facility and term loan facility. We will not receive any of the proceeds from sales of securities by selling securityholders, if any, pursuant to this prospectus.

This section describes the general terms and provisions of the operating partnership’s debt securities. When our operating partnership offers to sell a particular series of debt securities, we will describe the specific terms of the series in a supplement to this prospectus, along with any applicable modifications of or additions to the general terms of the debt securities as described in this prospectus, including the terms of any related guarantees by the Company and the terms, if any, on which a series of debt securities may be convertible into or exchangeable for other securities. To the extent the information contained in the prospectus supplement differs from this summary description, you should rely on the information in the prospectus supplement.

The debt securities may be offered either separately, or together with, or upon the conversion or exercise of or in exchange for, other securities described in this prospectus. Debt securities may be the operating partnership’s senior, senior subordinated or subordinated obligations and may be issued in one or more series. Unless otherwise specified in the applicable prospectus supplement, the debt securities will be the operating partnership’s direct, unsecured senior obligations and will rank equally in right of payment with all of its other senior unsecured indebtedness.

Unless otherwise specified in a prospectus supplement, the debt securities will be issued under an indenture between us and U.S. Bank National Association, as trustee. The indenture contains the full legal text of the matters described in this section. We have summarized select portions of the indenture below. The summary is not complete and is subject to and qualified in its entirety by reference to all the provisions of the indenture, including definitions of the terms used in the indenture. Whenever we refer to particular sections or defined terms of the indenture in this prospectus or in a prospectus supplement, those sections or defined terms are incorporated by reference into this prospectus or the applicable prospectus supplement, and this summary also is subject to and qualified by reference to the description of the particular terms of a particular series of debt securities described in the applicable prospectus supplement. The form of the indenture has been filed as an exhibit to the Registration Statement of which this prospectus is a part and you should read the indenture for provisions that may be important to you. Capitalized terms used in the summary and not defined herein have the meanings specified in the indenture.

As used in this “Description of Debt Securities and Related Guarantees,” references to the “operating partnership,” “we,” “our” or “us” refer solely to Kilroy Realty, L.P. and not to any of its subsidiaries and references to the “Company” or “guarantor” refer solely to Kilroy Realty Corporation and not to any of its subsidiaries, unless otherwise expressly stated or the context otherwise requires.

The terms of each series of debt securities will be established by or pursuant to a resolution of the Company’s board of directors and set forth or determined in the manner provided in a resolution of the

Company’s board of directors, in an officer’s certificate or by a supplemental indenture. The particular terms of each series of debt securities, along with any applicable modifications of or additions to the general terms of the debt securities as described in this prospectus, will be described in a prospectus supplement relating to such series (including any pricing supplement or term sheet). A prospectus supplement, pricing supplement or term sheet may change any of the terms of the debt securities described in this prospectus.

Unless we state otherwise in the applicable prospectus supplement, we can issue an unlimited amount of the operating partnership’s debt securities under the indenture that may be in one or more series with the same or various maturities, at par, at a premium, or at a discount. We will set forth in a prospectus supplement (including any pricing supplement or term sheet) relating to any series of debt securities being offered, the aggregate principal amount and the following terms of the debt securities, if applicable:

As discussed above, we may issue debt securities of the operating partnership that provide for an amount less than their stated principal amount to be due and payable upon declaration of acceleration of their maturity pursuant to the terms of the indenture. In addition, we may denominate the purchase price of any of the debt securities in a foreign currency or currencies or a foreign currency unit or units, and the principal of and any premium and interest on any series of debt securities may be payable in a foreign currency or currencies or a foreign currency unit or units. The applicable prospectus supplement will provide you with information on the federal income tax considerations and other special considerations applicable to any such debt securities.

Unless we state otherwise in the applicable prospectus supplement, the debt securities of any series will not contain any provisions which may afford holders of the debt securities of such series protection in the event the operating partnership or the Company has a change of control or in the event of a highly leveraged transaction (whether or not such transaction results in a change of control), which could adversely affect holders of debt securities.

We will set forth in the applicable prospectus supplement any restrictive covenants applicable to any issue of any series of debt securities.

Unless we state otherwise in the applicable prospectus supplement, the operating partnership and the Company may consolidate with, or sell, lease or convey all or substantially all of their respective assets to, or merge with or into, any other entity, provided that the following conditions are met:

Upon any such merger, consolidation or conveyance, the resulting, surviving or transferee person shall succeed to, and may exercise every right and power of, the operating partnership or the Company, as the case may be, under the indenture.

Unless we state otherwise in the applicable prospectus supplement, the indenture provides that the following events are “Events of Default” with respect to any series of debt securities:

A supplemental indenture or officer’s certificate establishing the terms of a particular series of debt securities may delete, modify or add to the Events of Default described above.

If an Event of Default with respect to the debt securities of a particular series occurs and is continuing (other than an Event of Default specified in the last bullet above, which shall result in an automatic acceleration), then in every case the trustee or the holders of not less than 25% in principal amount of the outstanding debt securities of such series may declare the principal amount of, and accrued and unpaid interest on, all of the debt securities of such series to be due and payable immediately by written notice thereof to the operating partnership and the Company (and to the trustee if given by the holders). However, at any time after the declaration of acceleration (or automatic acceleration) with respect to the debt securities of such series has occurred, but before a judgment or decree for payment of the money due has been obtained by the trustee, the holders of not less than a majority in principal amount of the debt securities of such series outstanding may rescind and annul the declaration and its consequences if:

The indenture also will provide that the holders of not less than a majority in principal amount of the outstanding debt securities of any series may waive any past default or Event of Default with respect to the debt securities of such series and its consequences, except, among other things, a default:

The trustee will be required to give notice to the holders of the debt securities of any particular series within 90 days of a default under the indenture with respect to the debt securities of such series known to a responsible officer (as defined in the indenture) of the trustee unless the default has been cured or waived; provided, however, that the trustee may withhold notice to the holders of the debt securities of such series of any default with respect to the debt securities of such series (except a default in the payment of the principal of or premium, if any or interest on the debt securities of such series) if specified responsible officers of the trustee in good faith determines the withholding to be in the interest of the holders of the debt securities of such series; and provided, further, that in the case of a default with respect to the debt securities of any series of the character specified in the penultimate bullet point of the first paragraph under this caption “Events of Default,” no such notice to holders of debt securities of such series shall be given until at least 60 days after the occurrence thereof.

The indenture will provide that no holder of the debt securities of a particular series may institute any action or proceedings, judicial or otherwise, with respect to the indenture or for any remedy thereunder, unless:

This provision will not prevent, however, any holder of the debt securities of any series from instituting suit for the enforcement of payment of the principal of or premium if any, or interest on such debt securities on or after the respective due dates thereof.

Subject to provisions in the indenture relating to its duties in case of default, the trustee will be under no obligation to exercise any of its rights or powers under the indenture at the request or direction of any holders of debt securities of any series then outstanding under the indenture, unless the holders of debt securities of such series shall have offered to the trustee reasonable security or indemnity. The holders of not less than a majority in principal amount of the outstanding debt securities of any series shall have the right to direct the time, method and place of conducting any proceeding for any remedy available to the trustee, or of exercising any trust or power conferred upon the trustee with respect to the debt securities of such series. However, the trustee may refuse to follow any direction which is in conflict with any law or the indenture or which may involve the trustee in personal liability or be unduly prejudicial to the holders of the debt securities of such series not joining therein.

Within 120 days after the close of each fiscal year, the operating partnership and the Company must deliver a certificate of an officer certifying to the trustee whether or not the officer has knowledge of any default under the indenture and, if so, specifying each default and the nature and status thereof.

Unless we state otherwise in the applicable prospectus supplement, modifications and amendments of the indenture will be permitted to be made pursuant to a supplemental indenture entered into by the operating partnership, the Company and the trustee with the consent of the holders of not less than a majority in principal amount of all outstanding debt securities of each series affected by such supplemental indenture (including consent obtained in connection with a tender offer or exchange offer for the outstanding debt securities of such series); provided, however, that no modification or amendment may, without the consent of the holder of each debt security affected thereby:

Notwithstanding the foregoing, modifications and amendments of the indenture will be permitted to be made by supplemental indenture executed by the operating partnership, the Company and the trustee without the consent of any holder of the debt securities for, among other things, any of the following purposes:

The operating partnership and the Company may omit in any particular instance to comply with certain specified covenants in the indenture with respect to the debt securities of any series if the holders of at least a majority in principal amount of all outstanding debt securities of such series waive such compliance. In determining whether the holders of the requisite principal amount of outstanding debt securities have given any request, demand, authorization, direction, notice, consent or waiver under the indenture or whether a quorum is present at a meeting of holders of debt securities, the indenture will provide that debt securities owned by the operating partnership, the Company or any other obligor upon the debt securities or the guarantees thereof or any affiliate of the operating partnership, the Company, or of any other such obligor shall be disregarded.

The indenture will contain provisions for convening meetings of the holders of debt securities of any series. A meeting of the holders of debt securities of any series will be permitted to be called at any time by the trustee, and also, upon request, by the operating partnership or the holders of at least 25% in principal amount of the

outstanding debt securities of such series, in any case upon notice given as provided in the indenture. Except for any consent that must be given by the holder of each debt security affected by certain modifications and amendments of the indenture, any resolution presented at a meeting or adjourned meeting duly reconvened at which a quorum is present will be permitted to be adopted by the affirmative vote of the holders of a majority in principal amount of the outstanding debt securities of such series; provided, however, that, except as referred to above, any resolution with respect to any request, demand, authorization, direction, notice, consent, waiver or other action that may be made, given or taken by the holders of a specified percentage, which is less than a majority, in principal amount of the outstanding debt securities of such series may be adopted at a meeting or adjourned meeting duly reconvened at which a quorum is present by the affirmative vote of the holders of the specified percentage in principal amount of the outstanding debt securities of such series. Any resolution passed or decision taken at any meeting of holders of debt securities of any series duly held in accordance with the indenture will be binding on all holders of the debt securities of such series. The quorum at any meeting called to adopt a resolution, and at any reconvened meeting of the debt securities of any series, will be holders of a majority in principal amount of the outstanding debt securities of such series; provided, however, that if any action is to be taken at the meeting with respect to a request, demand, authorization, direction, notice, consent, waiver or other action which may be given by the holders of not less than a specified percentage in principal amount of the outstanding debt securities of such series, holders of the specified percentage in principal amount of the outstanding debt securities of such series will constitute a quorum with respect to that matter.

Notwithstanding the foregoing provisions, if any action is to be taken at a meeting of holders of debt securities of any series with respect to any request, demand, authorization, direction, notice, consent, waiver or other action that the indenture expressly provides may be taken by holders of such series and one or more additional series acting collectively and voting together as a single class, there shall be no minimum quorum requirement for that meeting and the principal amount of outstanding debt securities of all such series that are entitled to vote in favor of that request, demand, authorization, direction, notice, consent, waiver or other action shall be taken into account in determining whether such action has been made, given or taken under the indenture.

Unless we state otherwise in the applicable prospectus supplement, the indenture shall cease to be of further effect with respect to any series of debt securities, and the Company shall be released from its guarantee of the debt securities of such series (subject to the survival of a limited number of specified provisions) when:

To effect legal defeasance or covenant defeasance, the operating partnership will be required to make an irrevocable deposit with the trustee, in trust for such purpose, of money and/or Government Obligations that, through the scheduled payment of interest and principal in accordance with their terms, will provide money in an amount sufficient to pay and discharge the principal, premium, if any, and interest on the debt securities of such series on the scheduled due dates or the applicable redemption date, as the case may be, in accordance with the terms of the indenture and the debt securities of such series. Upon any legal defeasance (but not covenant defeasance) the Company will be released from its guarantee of the debt securities of such series.

The trust described in the preceding paragraph may only be established if, among other things:

In the event we effect covenant defeasance with respect to the debt securities of any series, then any failure by the operating partnership or the Company to comply with any covenant as to which there has been covenant defeasance will not constitute an Event of Default. However, if the debt securities of such series are declared due and payable because of the occurrence of any other Event of Default, the amount of monies and/or Government Obligations deposited with the trustee to effect such covenant defeasance may not be sufficient to pay amounts due on the debt securities of such series at the time of any acceleration resulting from such Event of Default. However, the operating partnership and the Company would remain liable to make payment of such amounts due at the time of acceleration.

The indenture, the debt securities and any guarantees endorsed on the certificates evidencing the debt securities will be governed by, and construed in accordance with, the internal laws of the State of New York.

The debt securities of each series will be initially issued in the form of one or more registered debt securities in global form, without interest coupons, or the global notes. Upon issuance, each of the global notes will be deposited with the trustee as custodian for The Depository Trust Company, or DTC, and registered in the name of Cede & Co., as nominee of DTC.

Ownership of beneficial interests in a global note will be limited to persons who have accounts with DTC, or DTC participants, or persons who hold interests through DTC participants. We expect that under procedures established by DTC:

Beneficial interests in global notes may not be exchanged for notes in physical, certificated form except in the limited circumstances described below.

All interests in the global notes will be subject to the operations and procedures of DTC. We provide the following summary of those operations and procedures solely for the convenience of investors. The operations and procedures of DTC are controlled by that settlement system and may be changed at any time. None of the operating partnership, the Company or the applicable underwriters are responsible for those operations or procedures.

DTC was created to hold securities for its participants and to facilitate the clearance and settlement of securities transactions between its participants through electronic book-entry changes to the accounts of its participants. DTC’s participants include securities brokers and dealers, including underwriters, banks and trust companies, clearing corporations and other organizations. Indirect access to DTC’s system is also available to others such as banks, brokers, dealers and trust companies; these indirect participants clear through or maintain a custodial relationship with a DTC participant, either directly or indirectly. Investors who are not DTC participants may beneficially own securities held by or on behalf of DTC only through DTC participants or indirect participants in DTC.

So long as DTC’s nominee is the registered owner of a global note, that nominee will be considered the sole owner or holder of the debt securities represented by that global note for all purposes under the indenture. Except as provided below, owners of beneficial interests in a global note:

As a result, each investor who owns a beneficial interest in a global note of any series must rely on the procedures of DTC to exercise any rights of a holder of debt securities of such series under the indenture (and, if the investor is not a participant or an indirect participant in DTC, on the procedures of the direct, or, if applicable, indirect DTC participant through which the investor owns its interest).

Payments of principal, premium, if any, and interest with respect to the debt securities represented by a global note will be made by the trustee to DTC or DTC’s nominee as the registered holder of the global note. Neither the operating partnership, the Company nor the trustee will have any responsibility or liability for the payment of amounts to owners of beneficial interests in a global note, for any aspect of the records relating to or payments made on account of those interests by DTC, or for maintaining, supervising or reviewing any records of DTC relating to those interests.

Payments by participants and indirect participants in DTC to the owners of beneficial interests in a global note will be governed by standing instructions and customary industry practice and will be the responsibility of those participants or indirect participants and DTC.

Transfers between participants in DTC will be effected under DTC’s procedures and will be settled in same-day funds.

If the debt securities of any series are initially issued as global notes, debt securities of such series in physical, certificated form will be issued and delivered to each person that DTC identifies as a beneficial owner of the related debt securities of such series only if:

The following is a summary of some of the terms and provisions of the capital stock of Kilroy Realty Corporation, which we refer to as the “Company.” The following description does not purport to be complete and is subject to, and qualified in its entirety by reference to, the provisions of the Company’s charter (including, without limitation, the articles supplementary (the “Articles Supplementary”) establishing the terms of the Company’s 6.875% Series G Cumulative Redeemable Preferred Stock (the “Series G preferred stock”) and 6.375% Series H Cumulative Redeemable Preferred Stock (the “Series H preferred stock”)) incorporated by reference to our SEC filings. Unless otherwise expressly stated or the context otherwise requires, “we,” “us” and “our” refer collectively to the Company, Kilroy Realty, L.P., which is the Company’s operating partnership and which we refer to as the “operating partnership,” and the Company’s other subsidiaries. See “Where You Can Find More Information.”

The Company’s charter authorizes us to issue 150,000,000 shares of common stock, par value $.01 per share. As of September 30, 2013, we had 82,113,491 shares of common stock outstanding. The number of outstanding shares of common stock excludes the following as of September 30, 2013: (i) 1,525,000 shares of common stock issuable upon exercise of options granted under our equity compensation plans; (ii) 43,836 additional shares of common stock reserved and available for issuance under our equity compensation plans; (iii) 1,341,680 shares of common stock underlying restricted stock units awarded under our stock award deferral program; (iv) 1,821,503 shares of common stock issuable upon redemption of common units of the operating partnership outstanding; (v) 5,640,939 shares (subject to certain anti-dilution and other potential adjustments) of common stock potentially issuable upon the exchange of our 4.250% Exchangeable Senior Notes due 2014, calculated using the maximum exchange rate; and (vi) a total of up to 9,236,100 shares of our common stock (subject to certain anti-dilution and other potential adjustments) issuable upon conversion of our Series G preferred stock and Series H preferred stock following a “Change of Control” (as defined in the terms of the Series G preferred stock and Series H preferred stock, respectively) of us.

We may pay distributions on shares of the Company’s common stock, subject to the preferential rights of the Company’s Series G preferred stock, the Company’s Series H preferred stock and any other series or class of capital stock that we may issue in the future with rights to dividends and other distributions senior to the Company’s common stock. However, we may only pay distributions when the board of directors (in its sole discretion) authorizes a distribution out of legally available funds.

Under the Maryland General Corporation Law, or the MGCL, the Company’s stockholders are generally not liable for our debts or obligations. If we liquidate, we will first pay all debts and other liabilities, including debts and liabilities arising out of the Company’s status as general partner of the operating partnership, and, second, any preferential distributions on any outstanding shares of our preferred stock. Each holder of the Company’s common stock then will share ratably in our remaining assets. All shares of the Company’s common stock have equal distribution, liquidation and voting rights, and have no preference or exchange rights, subject to the ownership limits in the Company’s charter or as permitted by the board of directors pursuant to executed agreements waiving these ownership limits with respect to specific stockholders.

Under the MGCL, we generally require approval by the Company’s stockholders by the affirmative vote of at least two-thirds of the votes entitled to vote before we can:

Because the term “substantially all” of a company’s assets is not defined in the MGCL, it is subject to Maryland common law and to judicial interpretation and review in the context of the unique facts and circumstances of any particular transaction. Although the MGCL allows the Company’s charter to establish a lesser percentage of affirmative votes by the Company’s stockholders for approval of those actions, the Company’s charter does not include such a provision.

The Company’s charter authorizes us to issue 30,000,000 shares of preferred stock, par value $.01 per share. Of the 30,000,000 authorized shares of preferred stock, we have classified and designated 4,600,000 shares as Series G preferred stock and 4,000,000 shares as Series H preferred stock. As of September 30, 2013, 4,000,000 shares of the Company’s Series G preferred stock are issued and outstanding and 4,000,000 shares of Series H preferred stock are issued and outstanding.

We may classify, designate and issue additional shares of currently authorized shares of preferred stock, in one or more classes or series, as authorized by the board of directors without the prior consent of the Company’s stockholders. The board of directors may grant the holders of preferred stock of any class or series preferences,

powers and rights—voting or otherwise—senior to the rights of holders of shares of the Company’s common stock. The board of directors can authorize the issuance of currently authorized shares of preferred stock with terms and conditions that could have the effect of delaying or preventing a change of control transaction that might involve a premium price for holders of shares of the Company’s common stock or otherwise be in their best interest. All shares of preferred stock which are issued and are or become outstanding are or will be fully paid and nonassessable. Before we may issue any shares of preferred stock of any class or series, the MGCL and the Company’s charter require the board of directors to determine the following with respect to such class or series:

Of the Company’s 30,000,000 authorized preferred shares, 4,600,000 shares have been classified and designated as 6.875% Series G Cumulative Redeemable Preferred Stock. Of these shares, as of September 30, 2013, 4,000,000 are issued and outstanding.

Each share of Series G preferred stock is entitled to receive, when, as, and if authorized by the Company’s board of directors and declared by us, out of funds legally available for the payment of dividends, cumulative cash dividends at the rate of 6.875% of the $25.00 per share liquidation preference per annum (equivalent to $1.71875 per annum per share), payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year.

Except as provided in the immediately following paragraph, unless full cumulative dividends for all past dividend periods on the Series G preferred stock have been or contemporaneously are declared and paid or declared and a sum sufficient for the payment thereof is set apart for such payment, no dividends (other than in shares of the Company’s common stock or shares of any other class or series of stock of the Company ranking junior to the Series G preferred stock as to dividends and as to the distribution of assets upon liquidation, dissolution and winding up of the Company) shall be declared or paid or set aside for payment nor shall any other distribution be declared or made on the Company’s common stock or any other class or series of stock of the Company ranking junior to or on a parity with the Series G preferred stock as to dividends or as to the distribution of assets upon liquidation, dissolution or winding up of the Company, nor shall any shares of the Company’s common stock or any other class or series of stock of the Company ranking junior to or on a parity with the Series G preferred stock as to dividends or as to the distribution of assets upon liquidation, dissolution or winding up of the Company be redeemed, purchased or otherwise acquired for any consideration (or any amounts be paid to or made available for a sinking fund for the redemption of any shares of any such stock) by the Company (except by conversion into or exchange for shares of the Company’s common stock or shares of any other class or series of stock of the Company ranking junior to the Series G preferred stock as to dividends and as to the distribution of assets upon liquidation, dissolution and winding up of the Company); provided, however,

that the foregoing shall not prevent the purchase or acquisition of shares of the Company’s stock to preserve the Company’s status as a real estate investment trust, or REIT, for federal and/or state income tax purposes. With respect to the Series G preferred stock, all references to “past dividend periods” shall mean, as of any date, dividend periods ending on or prior to such date, and with respect to shares of any other class or series of stock ranking on a parity as to dividends with the Series G preferred stock, “past dividend periods” shall mean, as of any date, dividend periods with respect to such other class or series of stock ending on or prior to such date.

When full cumulative dividends for all past dividend periods are not paid in full (or a sum sufficient for the full payment is not set apart) upon the shares of Series G preferred stock and when full cumulative dividends for all past dividend periods are not paid in full (or a sum sufficient for such full payment is not so set apart) upon the shares of any other class or series of the Company’s stock ranking on a parity as to dividends with the Series G preferred stock, then all dividends declared on shares of Series G preferred stock and any other outstanding classes or series of the Company’s stock ranking on a parity as to dividends with the Series G preferred stock shall be declared pro rata so that the amount of dividends declared per share on the Series G preferred stock and such other classes or series of stock ranking on a parity as to dividends with the Series G preferred stock shall in all cases bear to each other the same ratio that accumulated and unpaid dividends per share on the shares of Series G preferred stock and such other classes or series of stock ranking on a parity as to dividends with the Series G preferred stock (which, in the case of any such other class or series of stock ranking on a parity as to dividends with the Series G preferred stock, shall not include any accumulation in respect of unpaid dividends for past dividend periods if such other class or series of stock ranking on a parity as to dividends with the Series G preferred stock does not have a cumulative dividend) bear to each other.

The Series G preferred stock will, with respect to dividends and rights upon the distribution of assets upon the Company’s voluntary or involuntary liquidation, dissolution or winding-up, rank:

The Series G preferred stock will not be redeemable before March 27, 2017, except to preserve our status as a REIT for federal and/or state income tax purposes and except as described below upon the occurrence of a Series G Change of Control (as defined below). On and after March 27, 2017, we may, at our option, redeem any or all of the shares of the Series G preferred stock, for cash, at $25.00 per share plus, subject to exceptions, any accrued and unpaid dividends to but excluding the date fixed for redemption.

Upon the occurrence of a Series G Change of Control, we may, at our option, at any time or from time to time, redeem any or all of the shares of Series G preferred stock, within 120 days after the first date on which such Series G Change of Control occurred, for cash, at $25.00 per share plus, subject to exceptions, any accrued and unpaid dividends to but excluding the date fixed for redemption. If, prior to the Series G Change of Control Conversion Date (as defined below), we have provided or provide notice of our election to redeem some or all of the shares of Series G preferred stock (whether pursuant to our optional redemption right described in the paragraph above or the special optional redemption right described in this paragraph), the holders of Series G preferred stock will not have the conversion right described below under “—Conversion Rights” with respect to the shares of Series G preferred stock called for redemption.

A “Series G Change of Control” is when the following have occurred and are continuing:

The “Series G Change of Control Conversion Date” is the date the Series G preferred stock is to be converted into the Company’s common stock, which will be a business day selected by the Company that is no fewer than 20 days nor more than 35 days after the date on which the Company provides a notice of the occurrence of the Series G Change of Control that describes the resulting Series G Change of Control Conversion Right to the holders of Series G preferred stock.

Upon the occurrence of a Series G Change of Control, each holder of Series G preferred stock will have the right, which we refer to as the Series G Change of Control Conversion Right (unless, prior to the Series G Change of Control Conversion Date, the Company has provided notice of its election to redeem some or all of the shares of Series G preferred stock held by such holder pursuant to the redemption provisions described above under “—Redemption,” in which case such holder will have the right only with respect to shares of Series G preferred stock that are not called for redemption) to convert some or all of the Series G preferred stock held by such holder on the Series G Change of Control Conversion Date, into a number of shares of the Company’s common stock per share of Series G preferred stock equal to the lesser of:

subject, in each case, to provisions for the receipt of alternative consideration under specified circumstances as set forth in the Articles Supplementary for the Series G preferred stock.

The “Series G Common Stock Price” is (i) if the consideration to be received in the Series G Change of Control by the holders of the Company’s common stock is solely cash, the amount of cash consideration per share of the Company’s common stock or (ii) if the consideration to be received in the Series G Change of Control by holders of the Company’s common stock is other than solely cash (x) the average of the closing sale prices per share of the Company’s common stock (or, if no closing sale price is reported, the average of the closing bid and ask prices per share or, if more than one in either case, the average of the average closing bid and

the average closing ask prices per share) for the ten consecutive trading days immediately preceding, but not including, the date on which such Series G Change of Control occurred as reported on the principal U.S. securities exchange on which the Company’s common stock is then traded, or (y) the average of the last quoted bid prices for the Company’s common stock in the over-the-counter market as reported by Pink OTC Markets Inc. or similar organization for the ten consecutive trading days immediately preceding, but not including, the date on which such Series G Change of Control occurred, if the Company’s common stock is not then listed for trading on a U.S. securities exchange.

The Series G preferred stock has no maturity date, and the Company is not required to redeem the Series G preferred stock at any time. Accordingly, the shares of Series G preferred stock will remain outstanding indefinitely, unless the Company decides, at its option, to exercise its redemption rights or otherwise repurchase them or they become convertible and are converted in the manner set forth in Articles Supplementary for the Series G preferred stock. None of the Series G preferred stock is subject to any sinking fund.

Holders of Series G preferred stock do not have any voting rights except as set forth below. Whenever dividends on any shares of Series G preferred stock are in arrears for six or more quarterly periods, whether or not consecutive, the holders of Series G preferred stock will have the right to vote as a single class with all other classes or series of stock ranking on parity with the Series G preferred stock upon which like voting rights have been conferred and are exercisable for the election of two additional directors to the board of directors. The election will take place at:

When all of the dividends in arrears have been paid or declared and provided for in full, the right of holders of the Series G preferred stock to elect those two directors will cease and, unless there are one or more other classes or series of the Company’s preferred stock ranking on a parity with the Series G preferred stock upon which like voting rights have been conferred and are exercisable, the term of office of the two directors shall automatically terminate and the number of directors constituting the board of directors shall be reduced accordingly.

In addition, so long as any shares of Series G preferred stock are outstanding, without the consent or affirmative vote of at least two-thirds of the shares of Series G preferred stock then outstanding, the Company may not:

provided that any amendment to the Company’s charter to increase the number of authorized shares of stock or the creation or issuance of any other class or series of preferred stock or any increase in the number of authorized or outstanding shares of Series G preferred stock or any other class or series of stock, in each case ranking on a parity with or junior to the Series G preferred stock with respect to payment of dividends and the distribution of assets upon liquidation, dissolution and winding up, shall not be deemed to materially and adversely affect any right, preference, privilege or voting power of the Series G preferred stock.

On each matter on which holders of Series G preferred stock are entitled to vote, each share of Series G preferred stock will be entitled to one vote, except that when shares of any other class or series of the Company’s preferred stock have the right to vote with the Series G preferred stock as a single class on any matter, the Series G preferred stock and the shares of each such other class or series will have one vote for each $50.00 of liquidation preference (excluding accrued and unpaid dividends), resulting in each share of Series G preferred stock being entitled to one-half of a vote under such circumstances.

Except as expressly stated in the Articles Supplementary for the Series G preferred stock, the Series G preferred stock will not have any relative, participating, optional or other special voting rights or powers and the consent of the holders shall not be required for the taking of any corporate action.

The voting provisions above will not apply if, at or prior to the time when the act with respect to which the vote would otherwise be required would occur, all outstanding shares of Series G preferred stock shall have been redeemed or called for redemption upon proper notice and sufficient funds shall have been irrevocably deposited in trust to effect the redemption.

Upon any voluntary or involuntary liquidation, dissolution or winding-up of the Company, each share of Series G preferred stock is entitled to receive, out of our assets legally available for distribution to stockholders, a liquidation distribution of $25.00 per share, plus any accrued but unpaid dividends, in preference to any of the Company’s common stock or any other class or series of the Company’s stock ranking junior to the Series G preferred stock, but subject to the preferential rights of any class or series of our preferred stock ranking senior to the Series G preferred stock.

Of the Company’s 30,000,000 authorized preferred shares, 4,000,000 shares have been classified and designated as 6.375% Series H Cumulative Redeemable Preferred Stock. Of these shares, as of September 30, 2013, 4,000,000 are issued and outstanding.

Each share of Series H preferred stock is entitled to receive, when, as, and if authorized by the Company’s board of directors and declared by us, out of funds legally available for the payment of dividends, cumulative cash dividends at the rate of 6.375% of the $25.00 per share liquidation preference per annum (equivalent to $1.59375 per annum per share), payable quarterly in arrears on February 15, May 15, August 15 and November 15 of each year.

Except as provided in the immediately following paragraph, unless full cumulative dividends for all past dividend periods on the Series H preferred stock have been or contemporaneously are declared and paid or declared and a sum sufficient for the payment thereof is set apart for such payment, no dividends (other than in shares of the Company’s common stock or shares of any other class or series of stock of the Company ranking junior to the Series H preferred stock as to dividends and as to the distribution of assets upon liquidation, dissolution and winding up of the Company) shall be declared or paid or set aside for payment nor shall any other distribution be declared or made on the Company’s common stock or any other class or series of stock of the Company ranking junior to or on a parity with the Series H preferred stock as to dividends or as to the distribution of assets upon liquidation, dissolution or winding up of the Company, nor shall any shares of the Company’s common stock or any other class or series of stock of the Company ranking junior to or on a parity with the Series H preferred stock as to dividends or as to the distribution of assets upon liquidation, dissolution or winding up of the Company be redeemed, purchased or otherwise acquired for any consideration (or any amounts be paid to or made available for a sinking fund for the redemption of any shares of any such stock) by the Company (except by conversion into or exchange for shares of the Company’s common stock or shares of any other class or series of stock of the Company ranking junior to the Series H preferred stock as to dividends and as to the distribution of assets upon liquidation, dissolution and winding up of the Company); provided, however, that the foregoing shall not prevent the purchase or acquisition of shares of the Company’s stock to preserve the Company’s status as a REIT for federal and/or state income tax purposes. With respect to the Series H preferred stock, all references to “past dividend periods” shall mean, as of any date, dividend periods ending on or prior to such date, and with respect to shares of any other class or series of stock ranking on a parity as to dividends with the Series H preferred stock, “past dividend periods” shall mean, as of any date, dividend periods with respect to such other class or series of stock ending on or prior to such date.

When full cumulative dividends for all past dividend periods are not paid in full (or a sum sufficient for the full payment is not set apart) upon the shares of Series H preferred stock and when full cumulative dividends for all past dividend periods are not paid in full (or a sum sufficient for such full payment is not so set apart) upon the shares of any other class or series of the Company’s stock ranking on a parity as to dividends with the Series H preferred stock, then all dividends declared on shares of Series H preferred stock and any other outstanding classes or series of the Company’s stock ranking on a parity as to dividends with the Series H preferred stock shall be declared pro rata so that the amount of dividends declared per share on the Series H preferred stock and such other classes or series of stock ranking on a parity as to dividends with the Series H preferred stock shall in all cases bear to each other the same ratio that accumulated and unpaid dividends per share on the shares of Series H preferred stock and such other classes or series of stock ranking on a parity as to dividends with the Series H preferred stock (which, in the case of any such other class or series of stock ranking on a parity as to dividends with the Series H preferred stock, shall not include any accumulation in respect of unpaid dividends for past dividend periods if such other class or series of stock ranking on a parity as to dividends with the Series H preferred stock does not have a cumulative dividend) bear to each other.

The Series H preferred stock will, with respect to dividends and rights upon the distribution of assets upon the Company’s voluntary or involuntary liquidation, dissolution or winding-up, rank:

The Series H preferred stock will not be redeemable before August 15, 2017, except to preserve our status as a REIT for federal and/or state income tax purposes and except as described below upon the occurrence of a Series H Change of Control (as defined below). On and after August 15, 2017, we may, at our option, redeem any or all of the shares of the Series H preferred stock, for cash, at $25.00 per share plus, subject to exceptions, any accrued and unpaid dividends to but excluding the date fixed for redemption.

Upon the occurrence of a Series H Change of Control, we may, at our option, at any time or from time to time, redeem any or all of the shares of Series H preferred stock, within 120 days after the first date on which such Series H Change of Control occurred, for cash, at $25.00 per share plus, subject to exceptions, any accrued and unpaid dividends to but excluding the date fixed for redemption. If, prior to the Series H Change of Control Conversion Date (as defined below), we have provided or provide notice of our election to redeem some or all of the shares of Series H preferred stock (whether pursuant to our optional redemption right described in the paragraph above or the special optional redemption right described in this paragraph), the holders of Series H preferred stock will not have the conversion right described below under “—Conversion Rights” with respect to the shares of Series H preferred stock called for redemption.

A “Series H Change of Control” is when the following have occurred and are continuing:

The “Series H Change of Control Conversion Date” is the date the Series H preferred stock is to be converted into the Company’s common stock, which will be a business day selected by the Company that is no fewer than 20 days nor more than 35 days after the date on which the Company provides a notice of the occurrence of the Series H Change of Control that describes the resulting Series H Change of Control Conversion Right to the holders of Series H preferred stock.

Upon the occurrence of a Series H Change of Control, each holder of Series H preferred stock will have the right, which we refer to as the Series H Change of Control Conversion Right (unless, prior to the Series H Change of Control Conversion Date, the Company has provided notice of its election to redeem some or all of the shares of Series H preferred stock held by such holder pursuant to the redemption provisions described above

under “—Redemption,” in which case such holder will have the right only with respect to shares of Series H preferred stock that are not called for redemption) to convert some or all of the Series H preferred stock held by such holder on the Series H Change of Control Conversion Date, into a number of shares of the Company’s common stock per share of Series H preferred stock equal to the lesser of:

subject, in each case, to provisions for the receipt of alternative consideration under specified circumstances as set forth in the Articles Supplementary for the Series H preferred stock.

The “Series H Common Stock Price” is (i) if the consideration to be received in the Series H Change of Control by the holders of the Company’s common stock is solely cash, the amount of cash consideration per share of the Company’s common stock or (ii) if the consideration to be received in the Series H Change of Control by holders of the Company’s common stock is other than solely cash (x) the average of the closing sale prices per share of the Company’s common stock (or, if no closing sale price is reported, the average of the closing bid and ask prices per share or, if more than one in either case, the average of the average closing bid and the average closing ask prices per share) for the ten consecutive trading days immediately preceding, but not including, the date on which such Series H Change of Control occurred as reported on the principal U.S. securities exchange on which the Company’s common stock is then traded, or (y) the average of the last quoted bid prices for the Company’s common stock in the over-the-counter market as reported by Pink OTC Markets Inc. or similar organization for the ten consecutive trading days immediately preceding, but not including, the date on which such Series H Change of Control occurred, if the Company’s common stock is not then listed for trading on a U.S. securities exchange.

The Series H preferred stock has no maturity date, and the Company is not required to redeem the Series H preferred stock at any time. Accordingly, the shares of Series H preferred stock will remain outstanding indefinitely, unless the Company decides, at its option, to exercise its redemption rights or otherwise repurchase them or they become convertible and are converted in the manner set forth in Articles Supplementary for the Series H preferred stock. None of the Series H preferred stock is subject to any sinking fund.

Holders of Series H preferred stock do not have any voting rights except as set forth below. Whenever dividends on any shares of Series H preferred stock are in arrears for six or more quarterly periods, whether or not consecutive, the holders of Series H preferred stock will have the right to vote as a single class with all other classes or series of stock ranking on parity with the Series H preferred stock upon which like voting rights have been conferred and are exercisable for the election of two additional directors to the board of directors. The election will take place at:

When all of the dividends in arrears have been paid or declared and provided for in full, the right of holders of the Series H preferred stock to elect those two directors will cease and, unless there are one or more other classes or series of the Company’s preferred stock ranking on a parity with the Series H preferred stock upon which like voting rights have been conferred and are exercisable, the term of office of the two directors shall automatically terminate and the number of directors constituting the board of directors shall be reduced accordingly.

In addition, so long as any shares of Series H preferred stock are outstanding, without the consent or affirmative vote of at least two-thirds of the shares of Series H preferred stock then outstanding, the Company may not:

provided that any amendment to the Company’s charter to increase the number of authorized shares of stock or the creation or issuance of any other class or series of preferred stock or any increase in the number of authorized or outstanding shares of Series H preferred stock or any other class or series of stock, in each case ranking on a parity with or junior to the Series H preferred stock with respect to payment of dividends and the distribution of assets upon liquidation, dissolution and winding up, shall not be deemed to materially and adversely affect any right, preference, privilege or voting power of the Series H preferred stock.

On each matter on which holders of Series H preferred stock are entitled to vote, each share of Series H preferred stock will be entitled to one vote, except that when shares of any other class or series of the Company’s preferred stock have the right to vote with the Series H preferred stock as a single class on any matter, the Series H preferred stock and the shares of each such other class or series will have one vote for each $50.00 of liquidation preference (excluding accrued and unpaid dividends), resulting in each share of Series H preferred stock being entitled to one-half of a vote under such circumstances.

Except as expressly stated in the Articles Supplementary for the Series H preferred stock, the Series H preferred stock will not have any relative, participating, optional or other special voting rights or powers and the consent of the holders shall not be required for the taking of any corporate action.

The voting provisions above will not apply if, at or prior to the time when the act with respect to which the vote would otherwise be required would occur, all outstanding shares of Series H preferred stock shall have been redeemed or called for redemption upon proper notice and sufficient funds shall have been irrevocably deposited in trust to effect the redemption.

Upon any voluntary or involuntary liquidation, dissolution or winding-up of the Company, each share of Series H preferred stock is entitled to receive, out of our assets legally available for distribution to stockholders, a liquidation distribution of $25.00 per share, plus any accrued but unpaid dividends, in preference to any of the Company’s common stock or any other class or series of the Company’s stock ranking junior to the Series H preferred stock, but subject to the preferential rights of any class or series of our preferred stock ranking senior to the Series H preferred stock.

To maintain the Company’s tax status as a REIT, five or fewer “individuals,” as that term is defined in the Code, which includes certain entities, may not own, actually or constructively, more than 50% in value of the Company’s issued and outstanding capital stock at any time during the last half of a taxable year. Constructive ownership provisions in the Code determine if any individual or entity constructively owns the Company’s capital stock for purposes of this requirement. In addition, 100 or more persons must beneficially own the Company’s capital stock during at least 335 days of a taxable year or during a proportionate part of a short taxable year. Also, rent from tenants in which we actually or constructively own a 10% or greater interest is not qualifying income for purposes of the gross income tests of the Code. To help ensure we meet these tests, the Company’s charter restricts the acquisition and ownership of shares of the Company’s capital stock.

Subject to exceptions specified therein, the Company’s charter provides that no holder may own, either actually or constructively under the applicable constructive ownership provisions of the Code:

In addition, because rent from tenants in which we actually or constructively own a 10% or greater interest is not qualifying rent for purposes of the gross income tests under the Code, the Company’s charter provides that no holder may own, either actually or constructively by virtue of the constructive ownership provisions of the Code, which differ from the constructive ownership provisions used for purposes of the preceding sentence:

We refer to the limits described in this paragraph and the preceding paragraph, together, as the “ownership limits.”

The constructive ownership provisions set forth in the Code are complex, and may cause shares of the Company’s capital stock owned actually or constructively by a group of related individuals and/or entities to be constructively owned by one individual or entity. As a result, the acquisition of shares of the Company’s capital stock in an amount that does not exceed the ownership limits, or the acquisition of an interest in an entity that actually or constructively owns the Company’s capital stock, could, nevertheless cause that individual or entity, or another individual or entity, to own constructively shares in excess of the ownership limits and thus violate the ownership limits described above or otherwise permitted by the Company’s board of directors.

The Company’s charter permits the board of directors to waive the ownership limits with respect to a particular stockholder if the board of directors:

As a condition of this waiver, the Company’s board of directors may require opinions of counsel satisfactory to it and/or undertakings or representations from the applicant with respect to preserving the Company’s REIT status. The board of directors has waived the ownership limit applicable to the Company’s common stock for John B. Kilroy, Sr. and John B. Kilroy, Jr., members of their families and some of their affiliated entities, allowing them to own up to 19.6% of the Company’s common stock. However, the board of directors conditioned this waiver upon the receipt of undertakings and representations from Messrs. Kilroy which it believed were reasonably necessary to conclude that the waiver would not cause us to fail to qualify and maintain the Company’s status as a REIT. The Company’s board of directors has also waived the ownership limits with respect to the initial purchasers and certain of their affiliated entities in the offering of 4.250% Exchangeable Senior Notes due 2014, by our operating partnership, allowing each of such initial purchasers 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 of certain capped call transactions relating to those notes.

In addition to the foregoing ownership limits, the Company’s charter provides that no holder may own, either actually or constructively under the applicable attribution rules of the Code, any shares of any class of the Company’s capital stock if, as a result of this ownership:

Under the Company’s charter, any person who acquires or attempts or intends to acquire actual or constructive ownership of the Company’s shares of capital stock that violate any of the foregoing restrictions on transferability and ownership must give us notice immediately and provide us with any other information that we may request to determine the effect of the transfer on the Company’s status as a REIT. The foregoing restrictions on transferability and ownership will not apply if the Company’s board of directors determines that it is no longer in the Company’s best interest to attempt to qualify, or to continue to qualify, as a REIT.

The Company’s charter provides that if any attempted transfer of the Company’s capital stock or any other event would result in any person violating the ownership limits described above, unless otherwise permitted by the board of directors, then the purported transfer will be void ab initio and of no force or effect with respect to the attempted transferee as to that number of shares in excess of the applicable ownership limit, and the transferee shall acquire no right or interest in the excess shares. The Company’s charter further provides that in the case of any event other than a purported transfer, the person or entity holding record title to any of the excess shares shall cease to own any right or interest in the excess shares.

The Company’s charter provides that if any transfer or other event occurs that, if effective, would result in any person owning shares of Company’s capital stock in violation of the ownership limit described above, the number of shares of capital stock that otherwise would cause such person to violate the ownership limit (the “excess shares”) will be transferred automatically to a trust, the beneficiary of which will be a qualified charitable organization selected by us or, if for any reason that transfer is not automatically effective, then the transfer of such excess shares shall be void ab initio and the purported transferee will not have any rights in such excess shares. The automatic transfer will be effective as of the close of business on the business day prior to the date of the violative transfer.

Excess shares transferred to the charitable trust shall be deemed to have been offered for sale to us at a price per share equal to the lesser of the price paid by the prohibited transferee or owner for the excess shares (or, if the event which resulted in the transfer to the charitable shares did not involve the purchase of the applicable stock for fair value, the market price of such shares on the day of the event which resulted in the transfer of such shares to the charitable trust) and the market price on the date we accept such offer. We will have the right to accept such offer until the charitable trust has sold the excess shares as described above.

The trustee shall be designated by us and be unaffiliated with us and any prohibited transferee or owner. Prior to a sale of any excess shares by the trust, the trustee will receive, in trust for the beneficiary, all dividends and other distributions paid by us with respect to the excess shares, and may also exercise all voting rights with respect to the excess shares.

The Company’s charter provides that, subject to Maryland law, effective as of the date that the shares have been transferred to the trust, the trustee shall have the authority, at the trustee’s sole discretion:

However, if we have already taken irreversible corporate action, then the trustee may not rescind and recast the vote. Any dividend or other distribution paid to the prohibited transferee or owner, prior to our discovery that the shares had been automatically transferred to a trust as described above, must be repaid to the trustee upon demand for distribution to the beneficiary of the trust. If the transfer to the trust as described above is not automatically effective, for any reason, to prevent violation of the applicable ownership limit or as otherwise permitted by the board of directors, then the Company’s charter provides that the transfer of the excess shares will be void ab initio.

If shares of capital stock are transferred to any person in a manner which would cause us to be beneficially owned by fewer than 100 persons, the Company’s charter provides that the transfer shall be null and void in its entirety, and the intended transferee will acquire no rights to the stock.

If the Company’s board of directors shall at any time determine in good faith that a person has acquired, intends to acquire or own, has attempted to acquire or own, or may acquire or own the Company’s capital stock in violation of the limits described above, the Company’s charter provides that the board of directors shall take actions to refuse to give effect to or to prevent the ownership or acquisition, including, but not limited to:

All certificates representing shares of the Company’s capital stock bear a legend referring to the restrictions described above.

All persons who own at least a specified percentage of the outstanding shares of the Company’s stock must file with us a completed questionnaire annually containing information about their ownership of the shares, as set forth in the applicable Treasury regulations. Under current Treasury regulations, the percentage is between 0.5% and 5.0%, depending on the number of record holders of the Company’s shares. In addition, each stockholder may be required to disclose to us in writing information about the actual and constructive ownership of the Company’s shares as the board of directors deems necessary to comply with the provisions of the Code applicable to a REIT or to comply with the requirements of any taxing authority or governmental agency.

These ownership limitations could discourage a takeover or other transaction in which holders of some, or a majority, of the Company’s shares of capital stock might receive a premium for their shares over the then prevailing market price or which stockholders might believe to be otherwise in their best interest.

Computershare Shareowner Services LLC is the transfer agent and registrar for shares of the Company’s preferred stock and common stock.

We may issue warrants for the purchase of the Company’s preferred stock or common stock. Warrants may be issued independently or together with any other offered securities offered by the applicable prospectus supplement and may be attached to or separate from such offered securities. Each series of warrants will be issued under a separate warrant agreement to be entered into between the Company and a warrant agent specified in the applicable prospectus supplement. The warrant agent will act solely as our agent in connection with the warrants of such series and will not assume any obligation or relationship of agency or trust for or with any provisions of the warrants offered hereby. Further terms of the warrants and the applicable warrant agreements will be set forth in the applicable prospectus supplement.

The applicable prospectus supplement will describe the terms of the warrants in respect of which this prospectus is being delivered, including, where applicable, the following:

We may, at our option, elect to offer fractional or multiple shares of preferred stock, rather than single shares of preferred stock. In the event we exercise this option, we may issue depository receipts evidencing depositary shares, each of which will represent a fraction or multiple of, to be described in an applicable prospectus supplement, of a share of a particular series of preferred stock. The preferred stock represented by depositary shares will be deposited under a deposit agreement between us and a bank or trust company selected by us. Subject to the terms of the deposit agreement, each owner of a depositary share will, in general, be entitled, in proportion to the applicable fraction or multiple of a preferred stock represented by the depositary share, to all of the rights and preferences of the preferred stock or other equity stock represented thereby, including any dividend, voting, redemption, conversion or liquidation rights. For a description of our common stock and preferred stock, see the descriptions in this prospectus under the heading “Description of Capital Stock.”

The depositary shares will be evidenced by depositary receipts issued pursuant to the deposit agreement. The particular terms of the depositary shares offered by the applicable prospectus supplement will be described in the prospectus supplement, which may also include a discussion of certain U.S. federal income tax consequences.

Copies of the applicable form of deposit agreement and depositary receipt may be obtained from us upon request, and the statements made within this prospectus relating to the deposit agreement and the depositary receipt to be issued pursuant to the deposit agreement are summaries of certain anticipated provisions, and do not purport to be complete and are subject to, and qualified in their entirety by reference to, all of the provisions of the applicable deposit agreement and related depositary receipts.

The following is a summary of certain terms and provisions of the Seventh Amended and Restated Agreement of Limited Partnership of the operating partnership, which we refer to, together with any subsequent amendments, supplements or restatements thereof, as the “partnership agreement.” The following description does not purport to be complete and is subject to, and qualified in its entirety by reference to, the provisions of the partnership agreement. For more detail, you should refer to the partnership agreement itself, which is incorporated by reference to our SEC filings. See “Where You Can Find More Information.”

The operating partnership is a Delaware limited partnership. The Company is the sole general partner of the operating partnership and conducts substantially all of its business through the operating partnership.

As the sole general partner of the operating partnership, the Company exercises exclusive and complete discretion in the day-to-day management and control of the operating partnership. Subject to certain exceptions set forth in the partnership agreement, the Company can cause the operating partnership to enter into certain major transactions including acquisitions, dispositions and refinancings and cause changes in its line of business, capital structure and distribution policies. Limited partners may not transact business for, or participate in the management activities or decisions of, the operating partnership, except as provided in the partnership agreement and as required by applicable law.

The operating partnership has both preferred limited partnership interests and common limited partnership interests. As of September 30, 2013, the operating partnership had issued and outstanding 4,000,000 6.875% Series G Cumulative Redeemable Preferred Units, or the Series G preferred units, 4,000,000 6.375% Series H Cumulative Redeemable Preferred Units, or the Series H preferred units, all of which were held by the Company, and 1,821,503 common units. In this discussion, we refer collectively to the Series G preferred units, the Series H preferred units and any other preferred units the operating partnership may issue in the future as preferred units, and to the preferred units and the common units as the units.

To the extent permitted by applicable law, the partnership agreement provides indemnity to the Company, as general partner, and its officers, directors, employees, agents and any other persons the Company may designate. Similarly, the partnership agreement limits the Company’s liability, as well as that of its officers, directors, employees and agents, to the operating partnership.

Generally, the Company may not voluntarily withdraw from or transfer or assign its interest in the operating partnership without the consent of the holders of at least 60% of the common units including the Company’s interest. The limited partners may, without the consent of the general partner, transfer, assign, sell, encumber or otherwise dispose of their units in the operating partnership to family members, affiliates (as defined under federal securities laws) and charitable organizations and as collateral in connection with certain lending transactions, and, with the consent of the general partner, may also transfer, assign or sell their units to accredited investors. In each case, the transferee must agree to assume the transferor’s obligations under the partnership agreement. This transfer is also subject to the Company’s right of first refusal to purchase the limited partner’s units for our benefit.

In addition, without the Company’s consent, limited partners may not transfer their units:

The Company may not engage in any “termination transaction” without the approval of at least 60% of the common units in the operating partnership, including the Company’s general partnership interest in the operating partnership. Termination transactions consist of:

In connection with a termination transaction, all common limited partners must either receive, or have the right to elect to receive, for each common unit an amount of cash, securities or other property equal to the product of:

If, in connection with a termination transaction, a purchase, tender or exchange offer is made to holders of Company common stock, and the common stockholders accept the purchase, tender or exchange offer, each holder of common units must either receive, or must have the right to elect to receive, the greatest amount of cash, securities or other property which that holder would have received if immediately prior to the purchase, tender or exchange offer it had exercised its right to redeem common units, received shares of Company common stock in exchange for its common units, and accepted the purchase, tender or exchange offer.

The Company also may merge or otherwise combine its assets with another entity with the approval of at least 60% of the common units if:

The board of directors of the Company, in the Company’s capacity as general partner, will reasonably determine relative fair market values and rights, preferences and privileges of the limited partners as of the time of the termination transaction. These values may not be less favorable to the limited partners than the relative values reflected in the terms of the termination transaction.

The Company must use commercially reasonable efforts to structure termination transactions to avoid causing the common limited partners to recognize gain for federal income tax purposes by virtue of the occurrence of or their participation in the termination transaction. In addition, the operating partnership must use commercially reasonable efforts to cooperate with the common limited partners to minimize any taxes payable in connection with any repayment, refinancing, replacement or restructuring of indebtedness, or any sale, exchange or other disposition of its assets.

As sole general partner of the operating partnership, the Company has the ability to cause the operating partnership to issue additional units representing general and limited partnership interests. These units may include units representing preferred limited partnership interests, subject to the approval rights of holders of the Series G preferred units with respect to the issuance of preferred units ranking senior to the Series G preferred units and holders of the Series H preferred units with respect to the issuance of preferred units ranking senior to the Series H preferred units.

The Company may borrow additional funds in excess of the funds available from borrowings or capital contributions from a financial institution or other lender or through public or private debt offerings. The Company may then lend these funds to the operating partnership on the same terms and conditions that applied to the Company. In some cases, the Company may instead contribute these funds as an additional capital contribution to the operating partnership and increase its interest in the operating partnership and decrease the interests of the limited partners.

The Company may issue shares of common stock (including restricted Company common stock) to employees and other service providers of the operating partnership and/or its subsidiaries Kilroy Services, LLC or Kilroy Realty TRS, Inc., which we refer to collectively as the services companies, as applicable, in respect of services provided to such entity, pursuant to awards granted under the Company’s 1997 Stock Option and Incentive Plan, as amended, the Company’s 2006 Incentive Award Plan, as amended, or any other equity incentive award plan maintained by the Company from time to time.

Issuances of any such shares of Company common stock are treated as follows: (i) upon the issuance of the shares (or, with respect to restricted Company common stock, upon the vesting of such shares) a number of operating partnership units equal to the number of shares of Company common stock issued (or vested), are transferred by the operating partnership to the Company; (ii) any amounts paid by an employee or other service provider of the operating partnership or services companies, as applicable, to the Company to purchase such shares of Company common stock are transferred by the Company to the operating partnership or services companies, as applicable; and (iii) shares of Company common stock received by the employee or other service provider of the operating partnership or services companies, as applicable, are treated as compensation paid by the operating partnership or the services companies, as applicable, to the employee or other service provider (to the extent that the value of such shares at the time of transfer or subsequent vesting exceeds the amount paid for them).

Any distributions made to employees or other service providers of the operating partnership or services companies by the Company in respect of unvested shares of Company common stock are reimbursed to the Company by the operating partnership or services companies, as applicable, and are treated as compensation paid directly by the operating partnership or the services companies, as applicable. Unvested shares of Company common stock that are forfeited prior to vesting are returned to the Company by the employee or other service provider. In addition, any amounts paid for such shares are returned by the operating partnership or services companies, as applicable, to the Company. To the extent that an employee or other service provider provides services to more than one of the Company, the operating partnership, the services companies or any subsidiary, the Company may, in its discretion, allocate the payment or issuance of shares among such entities.

The foregoing description assumes that no employee or other service provider of the Company, the operating partnership or the services companies has made (or will make) an election under Section 83(b) of the Code.

The Company has the authority under the partnership agreement to make tax elections under the Code on the operating partnership’s behalf.

Notwithstanding the foregoing, the partnership agreement generally provides that the operating partnership’s adjusted net income (as defined in the partnership agreement) will first be allocated to the holders of the operating partnership’s Series G preferred units and the Series H preferred units and any other preferred units that the operating partnership may issue in the future to the extent of their preferred returns, with the remaining items of net income or net loss allocated according to the provisions described above. The allocations described above are subject to compliance with the provisions of Sections 704(b) and 704(c) of the Code and the associated Treasury regulations.

The operating partnership must be operated in a manner that will enable the Company to maintain its qualification as a REIT and avoid any federal income tax liability. The partnership agreement provides that the Company will determine from time to time, but not less frequently than quarterly, the net operating cash revenues of the operating partnership, as well as net sales and refinancing proceeds, pro rata in accordance with the partners respective percentage interests, subject to the distribution preferences with respect to the Series G preferred units and the Series H preferred units and any other preferred units that the operating partnership may issue in the future. The partnership agreement further provides that the operating partnership will assume and pay when due, or reimburse the Company for payment of, all expenses that the Company incurs relating to the ownership and operation of, or for the benefit of, the operating partnership and all costs and expenses relating to the Company’s operations.

The operating partnership will continue in full force and effect until December 31, 2095, or until sooner dissolved in accordance with the terms of the partnership agreement.

Each Series G preferred unit is entitled to receive cumulative preferential distributions payable on or before the 15th day of February, May, August and November of each year at a rate of 6.875% per annum of the $25.00 stated value of a Series G preferred unit (equivalent to $1.71875 per annum). The cumulative preferential distributions will be paid in preference to any payment made on any other class or series of partnership interest of the operating partnership, other than the Series H preferred units and any other class or series of partnership interest expressly designated as ranking on parity with or senior to the Series G preferred units.

The Series G preferred units will not be redeemable before March 27, 2017, except under circumstances intended to preserve the Company’s status as a REIT for federal and/or state income tax purposes or upon the occurrence of a Series G Change of Control (as defined in the Articles Supplementary for the Series G preferred stock). On and after March 27, 2017, the Series G preferred units may be redeemed at a redemption price, payable in cash, equal to the sum of $25.00 plus any accumulated and unpaid distributions to the date of redemption per Series G preferred unit. In addition, upon the occurrence of a Series G Change of Control, the Series G preferred units may be redeemed at a redemption price equal to the sum of $25.00 plus accumulated and unpaid distributions to the date of redemption per Series G preferred unit.

The Series G preferred units may be exchanged for common units upon a Series G Change of Control, all on the terms and subject to the conditions and exceptions described in the partnership agreement.

The distribution and income allocation provisions of the partnership agreement have the effect of providing each Series G preferred unit with a liquidation preference equal to $25.00 per unit, plus any accumulated but unpaid distributions, in preference to any other class or series of partnership interest other than those interests expressly designated as ranking on a parity with or senior to the Series G preferred units.

Each Series H preferred unit is entitled to receive cumulative preferential distributions payable on the 15th day of February, May, August and November of each year at a rate of 6.375% per annum of the $25.00 stated value of a Series H preferred unit (equivalent to $1.59375 per annum). The cumulative preferential distributions will be paid in preference to any payment made on any other class or series of partnership interest of the operating partnership, other than the Series G preferred units and any other class or series of partnership interest expressly designated as ranking on parity with or senior to the Series H preferred units.

The Series H preferred units will not be redeemable before August 15, 2017, except under circumstances intended to preserve the Company’s status as a real estate investment trust for federal and/or state income tax purposes or upon the occurrence of a Change of Control (as defined in the Articles Supplementary for the

Series H preferred stock). On and after August 15, 2017, the Series G preferred units may be redeemed at a redemption price payable in cash, equal to the sum of $25.00 plus any accumulated and unpaid distributions to the date of redemption per Series H preferred unit. In addition, upon the occurrence of a Change of Control, the Series H preferred units may be redeemed at a redemption price equal to the sum of $25.00 plus accumulated and unpaid distributions to the date of redemption per Series H preferred unit.

The Series H preferred units may be exchanged for common units upon a Change of Control, all on the terms and subject to the conditions and exceptions described in the partnership agreement.

The distribution and income allocation provisions of the partnership agreement have the effect of providing each Series H preferred unit with a liquidation preference equal to $25.00 per unit, plus any accumulated but unpaid distributions, in preference to any other class or series of partnership interest other than those interests expressly designated as ranking on a parity with or senior to the Series H preferred units.

The partnership agreement provides that, subject to the distribution preferences of the Series G preferred units and the Series H preferred units and any other preferred units that may be issued in the future, common units are entitled to receive quarterly distributions of available cash on a pro rata basis in accordance with their respective percentage interests. As of September 30, 2013, 1,821,503 issued and outstanding common units were held by our common limited partners other than the Company.

Common limited partners have the right to require the operating partnership to redeem part or all of their common units for cash based upon the fair market value of an equivalent number of shares of Company common stock at the time of the redemption. Alternatively, the Company may elect to acquire those units tendered for redemption in exchange for shares of Company common stock. The Company’s acquisition will be on a one-for-one basis, subject to adjustment in the event of stock splits, stock dividends, issuance of some rights, some extraordinary distributions and similar events. However, even if the Company elects not to acquire tendered units in exchange for shares of common stock, holders of common units that are corporations or limited liability companies may require that the Company issue common stock in exchange for their common units, subject to applicable ownership limits or any other limit as provided in the Company’s charter or as otherwise determined by the board of directors, as applicable. The Company presently anticipates that the Company will elect to issue shares of common stock in exchange for common units in connection with each redemption request, rather than having the operating partnership redeem the common units for cash. With each redemption or exchange, the Company increases its percentage ownership interest in the operating partnership. Common limited partners may exercise this redemption right from time to time, in whole or in part, except when, as a consequence of shares of common stock being issued, any person’s actual or constructive stock ownership would exceed the ownership limits, or any other limit as provided in the Company’s charter or as otherwise determined by the board of directors.

The partnership agreement provides that if the limited partners own at least 5% of the common units representing common partnership interests in the operating partnership, including those common units held by the Company as general partner, the Company will not, on behalf of the operating partnership and without the prior consent of the holders of more than 50% of the common units representing limited partnership interests in the operating partnership, dissolve the operating partnership, unless the dissolution or sale is incident to a merger or a sale of substantially all of the Company’s assets.

The following is a description of certain provisions of Maryland law and the Company’s charter and bylaws. This description is not complete and is subject to, and qualified in its entirety by reference to, Maryland law and the Company’s charter and bylaws. You should read the Company’s charter and bylaws, which are incorporated by reference to our SEC filings. See “Where You Can Find More Information.”

The Company’s charter provides that the number of the directors shall be established by its bylaws, but cannot be less than the minimum number required by the Maryland General Corporation Law, or MGCL, which is one. The Company’s bylaws allow the board of directors to fix or change the number to not fewer than three and not more than 13 members. The number of directors is currently fixed at six. A majority of the remaining board of directors may fill any vacancy, other than a vacancy caused by removal. A majority of the board of directors may fill a vacancy resulting from an increase in the number of directors. The stockholders entitled to vote for the election of directors at an annual or special meeting of the Company’s stockholders may fill a vacancy resulting from the removal of a director.

The Company’s charter and bylaws provide that a majority of the board of directors must be “independent directors.” An “independent director” is a director who is not:

Holders of shares of Company common stock have no right to cumulative voting for the election of directors. Consequently, at each annual meeting of the Company’s stockholders, the holders of a majority of the shares of Company common stock entitled to vote will be able to elect all of the successors of the directors at that meeting.

The Company’s charter provides that its stockholders may remove a director only for “cause” and only by the affirmative vote of at least two-thirds of the shares entitled to vote in the election of directors. The MGCL does not define the term “cause.” As a result, removal for “cause” is subject to Maryland common law and to judicial interpretation and review in the context of the unique facts and circumstances of any particular situation.

The Company has elected not to be subject to the “business combination” provisions of the MGCL (sections 3-601 through 3-604) and it cannot rescind such election and become subject to these business combination provisions without the approval of holders of a majority of its shares entitled to vote.

In the event that the Company decides to be subject to the business combinations provision, “business combinations” between a Maryland corporation and an interested stockholder or an affiliate of an interested stockholder are generally prohibited for five years after the most recent date on which the interested stockholder becomes an interested stockholder. A business combination includes a merger, consolidation or share exchange.

A business combination may also include an asset transfer or issuance or reclassification of equity securities. An interested stockholder is defined in the MGCL as:

A person is not an interested stockholder under the business combinations provisions of the MGCL if the board of directors approved in advance the transaction by which such person would otherwise have become an interested stockholder.

At the conclusion of the five-year prohibition, any business combination between the Maryland corporation and an interested stockholder generally must be recommended by the board of directors of the corporation and approved by the affirmative vote of at least:

These super-majority vote requirements do not apply if the corporation’s common stockholders receive a minimum price, as defined under Maryland law, for their shares in the form of cash or other consideration in the same form as previously paid by the interested stockholder for its shares. None of these provisions of Maryland law will apply, however, to business combinations that are approved or exempted by the board of directors of the corporation prior to the time that the interested stockholder becomes an interested stockholder.

As a result of the Company’s decision not to be subject to the business combinations statute, an interested stockholder would be able to effect a “business combination” without complying with the requirements discussed above, which may make it easier for stockholders who become interested stockholders to consummate a business combination involving the Company. However, the Company cannot assure you that any business combinations will be consummated or, if consummated, will result in a purchase of shares of capital stock from its stockholders at a premium.

The Company is not Subject to the Maryland Control Share Acquisition Statute

The Company has elected in its bylaws not to be subject to the “control share acquisition” provisions of the MGCL (sections 3-701 through 3-710). If it wants to be subject to these provisions, its bylaws would need to be amended. Such amendments would require the approval of the holders of a majority of the shares entitled to vote.

Maryland law provides that “control shares” of a company acquired in a “control share acquisition” have no voting rights except to the extent approved by a vote of two-thirds of the votes entitled to vote, excluding shares owned by the acquiror or by officers or directors who are employees of the Company. “Control shares” are voting shares of stock which, if aggregated with all other voting shares of stock previously acquired by the acquiror, or over which the acquiror is able to directly or indirectly exercise voting power, except solely by revocable proxy, would entitle the acquiror to exercise voting power in electing directors within one of the following ranges of voting power:

“Control shares” do not include shares of stock the acquiring person is entitled to vote having obtained prior stockholder approval. Generally, “control share acquisition” means the acquisition of control shares.

A person who has made or proposes to make a control share acquisition may compel the board of directors to call a special meeting of stockholders to consider voting rights for the shares. The meeting must be held within 50 days of demand. If no request for a meeting is made, the Company may present the question at any stockholders’ meeting.

If voting rights are not approved at the meeting or if the acquiring person does not deliver an acquiring person statement as required by the statute, then, subject to conditions and limitations, the corporation may redeem any or all of the control shares, except those for which voting rights previously have been approved, for fair value. Fair value is determined without regard to the absence of voting rights for control shares, as of the date of the last control share acquisition or of any meeting of stockholders at which the voting rights of control shares are considered and not approved. If voting rights for control shares are approved at a stockholders meeting and the acquiror becomes entitled to vote a majority of the shares entitled to vote, all other stockholders may exercise appraisal rights. The fair value of the shares as determined for purposes of these appraisal rights may not be less than the highest price per share paid in the control share acquisition. Limitations and restrictions otherwise applicable to the exercise of dissenters’ rights do not apply in the context of a control share acquisition.

The control share acquisition statute does not apply to shares acquired in a merger, consolidation or share exchange if the company is a party to the transaction, or to acquisitions approved or exempted by its charter or bylaws. Because the Company is not subject to these provisions, stockholders who acquire a substantial block of Company common stock do not need approval of the other stockholders before exercising full voting rights with respect to their shares on all matters. This may make it easier for any of these control share stockholders to effect a business combination with the Company. However, the Company cannot assure you that any business combinations will be consummated or, if consummated, will result in a purchase of shares of Company common stock from any stockholder at a premium.

Under certain provisions of the MGCL relating to unsolicited takeovers, a Maryland corporation with a class of equity securities registered under the Exchange Act and at least three independent directors may elect to be subject to certain statutory provisions relating to unsolicited takeovers which, among other things, would automatically classify the board of directors into three classes with staggered terms of three years each and vest in its board of directors the exclusive right to determine the number of directors and the exclusive right, by the affirmative vote of a majority of the remaining directors, to fill vacancies on the board of directors, even if the remaining directors do not constitute a quorum. These statutory provisions also provide that any director elected to fill a vacancy shall hold office for the remainder of the full term of the class of directors in which the vacancy occurred, rather than the next annual meeting of directors as would otherwise be the case, and until his successor is elected and qualified.

An election to be subject to any or all of the foregoing statutory provisions may be made in the Company’s charter or bylaws, or by resolution of the board of directors. Any such statutory provision to which the Company elects to be subject will apply even if other provisions of Maryland law or the Company’s charter or bylaws provide to the contrary.

If the Company made an election to be subject to the statutory provisions described above, the board of directors would automatically be classified into three classes with staggered terms of office of three years each, and would have the exclusive right to determine the number of directors and the exclusive right to fill vacancies on the board of directors. Moreover, any director elected to fill a vacancy would hold office for the remainder of the full term of the class of directors in which the vacancy occurred.

In such instance, the classification and staggered terms of office of the directors would make it more difficult for a third party to gain control of the board of directors since at least two annual meetings of stockholders, instead of one, generally would be required to effect a change in the majority of the board of directors.

The Company has not elected to become subject to the foregoing statutory provisions relating to unsolicited takeovers. However, the Company could by resolutions adopted by the board of directors and without stockholder approval, elect to become subject to some or all of these statutory provisions.

The Company’s charter may generally be amended only if the amendment is declared advisable by the board of directors and approved by its stockholders by the affirmative vote of at least two-thirds of the shares entitled to vote on the amendment. The Company’s bylaws generally may be amended by the affirmative vote of a majority of the board of directors or of a majority of the Company’s shares entitled to vote. However, the following bylaw provisions may be amended only by the approval of a majority of the Company’s shares of capital stock entitled to vote:

The Company’s bylaws provide for annual meetings of its stockholders to elect directors and to transact other business properly brought before the meeting. In addition, a special meeting of stockholders may be called by:

The MGCL provides that the Company’s stockholders also may act by unanimous written consent without a meeting with respect to any action that they are required or permitted to take at a meeting. To do so, each stockholder entitled to vote on the matter must sign the consent setting forth the action.

The Company’s bylaws provide that with respect to an annual meeting of stockholders, nominations of persons for election to the board of directors and the proposal of other business to be considered by stockholders at the meeting may be made only:

The Company’s bylaws also provide that with respect to special meetings of stockholders, only the business specified in the notice of meeting may be brought before the meeting.

The advance notice provisions of the Company’s bylaws could have the effect of discouraging a takeover or other transaction in which holders of some, or a majority, of the shares of common stock might receive a premium for their shares over the then prevailing market price or which holders of the Company’s common stock believe is in their best interests.

Under the MGCL, the Company may be dissolved if a majority of the entire board of directors determines by resolution that dissolution is advisable and submits a proposal for dissolution for consideration at any annual or special meeting of stockholders, and this proposal is approved, by the vote of the holders of two-thirds of the shares of the Company’s capital stock entitled to vote on the dissolution.

The Company’s charter and bylaws, and the partnership agreement, provide for indemnification of its officers and directors against liabilities to the fullest extent permitted by the MGCL, as amended from time to time.

The MGCL permits the Company to indemnify its directors and officers and other parties against judgments, penalties, fines, settlements, and reasonable expenses actually incurred by them in connection with any proceeding to which they may be made a party by reason of their service in those or other capacities unless it is established that:

Under the MGCL, the Company may indemnify its directors or officers against judgments, penalties, fines, settlements and reasonable expenses that they actually incur in connection with the proceeding unless the proceeding is one by the Company or in its right and the director or officer has been found to be liable to the Company. In addition, the Company may not indemnify a director or officer in any proceeding charging improper personal benefit to them if they were found to be liable on the basis that personal benefit was received. The termination of any proceeding by judgment, order or settlement does not create a presumption that the director or officer did not meet the requisite standard of conduct required for indemnification to be permitted. The termination of any proceeding by conviction, or upon a plea of nolo contendere or its equivalent, or an entry of any order of probation prior to judgment, creates a rebuttable presumption that the director or officer did not meet the requisite standard of conduct required for indemnification to be permitted.

In addition, the MGCL provides that, unless limited by its charter, a corporation shall indemnify any director or officer who is made a party to any proceeding by reason of service in that capacity against reasonable expenses incurred by the director or officer in connection with the proceeding, in the event that the director or officer is successful, on the merits or otherwise, in the defense of the proceeding. The Company’s charter contains no such limitation.

As permitted by the MGCL, the Company’s charter limits the liability of its directors and officers to the Company and its stockholders for money damages, subject to specified restrictions. However, the liability of the Company’s directors and officers to it and its stockholders for money damages is not limited if:

This provision does not limit the Company’s ability or its stockholders’ ability to obtain other relief, such as an injunction or rescission.

The partnership agreement provides that the Company, as general partner, and its officers and directors are indemnified to the same extent its officers and directors are indemnified in its charter. The partnership agreement limits the Company’s liability and the liability of its officers and directors to the operating partnership and its partners to the same extent that its charter limits the liability of its officers and directors to it and its stockholders. See “Description of Material Provisions of the Partnership Agreement of Kilroy Realty, L.P.—Indemnification of the Company’s Officers and Directors.”

Insofar as the foregoing provisions permit indemnification of directors, officers or persons controlling the Company for liability arising under the Securities Act of 1933, as amended, the Securities Act, the Company has been informed that in the opinion of the SEC, this indemnification is against public policy as expressed in the Securities Act and is therefore unenforceable.

The Company has entered into indemnification agreements with certain of its executive officers and directors. The indemnification agreements provide that:

The Company’s indemnification agreements with its executive officers and directors offer substantially the same scope of coverage afforded by applicable law. In addition, as contracts, these indemnification agreements provide greater assurance to its directors and executive officers that indemnification will be available because they cannot be modified unilaterally in the future by the board of directors or the stockholders to eliminate the rights that they provide.

Anti-takeover Effect of Certain Provisions of Maryland Law and of the Company’s Charter and Bylaws

If the resolution of the board of directors exempting the Company from the business combination provisions of the MGCL and the applicable provision in its bylaws exempting it from the control share acquisition provisions of the MGCL are rescinded or revoked (which in each case would require stockholder approval) or it elects to be subject to the unsolicited takeover provisions of the MGCL, then the business combination, control share acquisition and unsolicited takeover provisions of the MGCL, the provisions of its charter on removal of directors, the advance notice provisions of its bylaws and certain other provisions of its charter and bylaws and Maryland law could delay, deter or prevent a change of control of the Company or other transactions that might involve a premium price for holders of its capital stock or otherwise be in their best interest.

The following is a general summary of the material United States federal income tax considerations related to the Company’s election to be taxed as REIT and the United States federal income tax considerations anticipated to be material to holders of our capital stock or the operating partnership’s debt securities. This summary is for general information only and is not tax advice. Supplemental United States federal income tax considerations relevant to the ownership of certain securities offered by this prospectus may be provided in the prospectus supplement that relates to those securities. Your tax treatment will vary depending upon the terms of the specific securities you acquire, as well as your particular situation. Unless otherwise expressly stated or the context otherwise requires, all references to “we,” “us” and “our” in this summary refer to the Company.

in each case, as of the date of this summary. These authorities may change or be subject to differing interpretations. The effects of other United States federal tax laws, such as estate and gift tax laws, and any applicable state, local or foreign tax laws are not discussed. We have not sought and do not plan to seek any rulings from the IRS that we qualify as a REIT or otherwise regarding the matters discussed below. In addition, the administrative interpretations and practices of the IRS include its practices and policies as expressed in private letter rulings that are not binding on the IRS except with respect to the particular taxpayers who requested and received those rulings. Future legislation, Treasury regulations, administrative interpretations and practices and/or court decisions may adversely affect the tax considerations contained in this discussion. Any such change could apply retroactively in a manner that could adversely affect a holder of our capital stock or the operating partnership’s debt securities. Thus, we can provide no assurance that the tax considerations contained in this summary will not be challenged by the IRS or will be sustained by a court if so challenged.

You are urged to consult your tax advisors regarding the tax consequences to you of:

General. We elected to be taxed as a REIT under Sections 856 through 860 of the Code, commencing with our taxable year ended December 31, 1997. We believe that we have been organized and have operated in a manner which will allow us to qualify for taxation as a REIT under the Code commencing with our taxable year ended December 31, 1997, and we intend to continue to be organized and operate in this manner. However, qualification and taxation as a REIT depend upon our ability to meet the various qualification tests imposed under the Code, including through actual annual operating results, asset composition, distribution levels and diversity of stock ownership. Accordingly, no assurance can be given that we have been organized and have operated, or will continue to be organized and operate, in a manner so as to qualify or remain qualified as a REIT. See “—Failure to Qualify.”

The sections of the Code and the corresponding Treasury regulations that relate to qualification and operation as a REIT are highly technical and complex. The following sets forth the material aspects of the sections of the Code that govern the United States federal income tax treatment of a REIT and its stockholders. This summary is qualified in its entirety by the applicable Code provisions, relevant rules and regulations promulgated under the Code, and administrative and judicial interpretations of the Code and these rules and regulations.

Latham & Watkins LLP has rendered an opinion to us to the effect that, commencing with our taxable year ended December 31, 1997, we have been organized and have operated in conformity with the requirements for qualification and taxation as a REIT, and that our proposed method of operation will enable us to continue to meet the requirements for qualification and taxation as a REIT, under the Code. It must be emphasized that this opinion was based on various assumptions and representations as to factual matters, including representations made by us in a factual certificate provided by one of our officers. In addition, this opinion was based upon the facts set forth in this prospectus concerning our business, assets and governing documents, as well as the business, assets and governing documents of the operating partnership and our other subsidiaries. Moreover, our qualification and taxation as a REIT depend upon our ability to meet the various qualification tests imposed under the Code which are discussed in more detail below, including through actual annual operating results, asset composition, distribution levels and diversity of stock ownership, the results of which have not been and will not be reviewed by Latham & Watkins LLP. Accordingly, no assurance can be given that our actual results of operation for any particular taxable year have satisfied or will satisfy those requirements. See “—Failure to Qualify” below. Further, the United States federal income tax consequences related to the acquisition, ownership and disposition of our capital stock described below may be changed, perhaps retroactively, by legislative, administrative or judicial action at any time. Latham & Watkins LLP has no obligation to update its opinion subsequent to its date.

Provided we qualify for taxation as a REIT, we generally will not be required to pay United States federal corporate income taxes on our net income that is currently distributed to our stockholders. This treatment substantially eliminates the “double taxation” that ordinarily results from investment in a C corporation. A C corporation is a corporation that is generally required to pay tax at the corporate-level. Double taxation generally means taxation that occurs once at the corporate level when income is earned and once again at the stockholder level when the income is distributed. We will be required to pay United States federal income tax, however, as follows:

Requirements for Qualification as a Real Estate Investment Trust. The Code defines a REIT as a corporation, trust or association:

The Code provides that conditions (1) to (4), inclusive, must be met during the entire taxable year and that condition (5) must be met during at least 335 days of a taxable year of twelve months, or during a proportionate part of a taxable year of less than twelve months. Conditions (5) and (6) do not apply until after the first taxable year for which an election is made to be taxed as a REIT. For purposes of condition (6), the term “individual”

generally includes a supplemental unemployment compensation benefit plan, a private foundation or a portion of a trust permanently set aside or used exclusively for charitable purposes, but does not include a qualified pension plan or profit sharing trust.

We believe that we have been organized, have operated and have issued sufficient shares of capital stock with sufficient diversity of ownership to allow us to satisfy conditions (1) through (7) inclusive, during the relevant time periods. In addition, our charter with respect to our common stock, and the articles supplementary with respect to preferred stock we may issue from time to time, provide for restrictions regarding the ownership and transfer of our shares which are intended to assist us in continuing to satisfy the share ownership requirements described in conditions (5) and (6) above. These stock ownership and transfer restrictions with respect to our common stock are described in Article IV of our charter. These restrictions, however, may not ensure that we will, in all cases, be able to satisfy the share ownership requirements described in conditions (5) and (6) above. If we fail to satisfy these share ownership requirements, except as provided in the next sentence, our status as a REIT will terminate. If, however, we comply with the rules contained in applicable Treasury regulations that require us to ascertain the actual ownership of our shares and we do not know, or would not have known through the exercise of reasonable diligence, that we failed to meet the requirement described in condition (6) above, we will be treated as having met this requirement. See “—Failure to Qualify.”

In addition, we may not maintain our status as a REIT unless our taxable year is the calendar year. We have and will continue to have a calendar taxable year.

Ownership of Interests in Partnerships, Limited Liability Companies and Qualified REIT Subsidiaries. We own and operate one or more properties through partnerships and limited liability companies. Treasury regulations generally provide that, in the case of a REIT which is a partner in a partnership or a member in a limited liability company that is treated as a partnership for United States federal income tax purposes, the REIT will be deemed to own its proportionate share of the assets of the partnership or limited liability company, as the case may be, based on its interest in partnership capital, subject to special rules relating to the 10% REIT asset test described below. Also, pursuant to Treasury regulations, the REIT will be deemed to be entitled to its proportionate share of the income of that entity. The assets and gross income of the partnership or limited liability company retain the same character in the hands of the REIT, including for purposes of satisfying the gross income tests and the asset tests. In addition, for these purposes, the assets and items of income of any partnership or limited liability company treated as a partnership or disregarded entity for United States federal income tax purposes in which we directly or indirectly own an interest include such entity’s share of assets and items of income of any partnership or limited liability company in which it owns an interest. We have included a brief summary of the rules governing the United States federal income taxation of partnerships and limited liability companies below in “—Tax Aspects of the Operating Partnership, the Subsidiary Partnerships and Limited Liability Companies.”

We have direct control of the operating partnership and certain subsidiary partnerships and limited liability companies and we intend to continue to operate them in a manner consistent with the requirements for our qualification as a REIT. From time to time, we may be a limited partner or non-managing member in certain partnerships and limited liability companies. If any such partnership or limited liability company were to take actions that could jeopardize our status as a REIT or require us to pay tax, we could be forced to dispose of our interest in such entity. In addition, it is possible that a partnership or limited liability company could take an action which could cause us to fail a REIT income or asset test, and that we would not become aware of such action in time to dispose of our interest in the partnership or limited liability company or take other corrective action on a timely basis. In that case, we could fail to qualify as a REIT unless we were entitled to relief, as described below. See “—Failure to Qualify” below.

We may from time to time own and operate certain properties through wholly owned subsidiaries that we intend to be treated as “qualified REIT subsidiaries” under the Code. A corporation will qualify as our qualified REIT subsidiary if we own 100% of the corporation’s outstanding stock and we do not elect with the corporation to treat it as a “taxable REIT subsidiary,” as described below. A qualified REIT subsidiary is not treated as a separate

corporation, and all assets, liabilities and items of income, gain, loss, deduction and credit of our qualified REIT subsidiaries will be treated as our assets, liabilities and such items, for all purposes of the Code, including the REIT qualification tests. Thus, in applying the United States federal tax requirements described in this prospectus, any corporations in which we own a 100% interest (other than any taxable REIT subsidiaries) are ignored, and all assets, liabilities and items of income, gain, loss, deduction and credit of such corporations are treated as our assets, liabilities, and items of income, gain, loss, deduction and credit. A qualified REIT subsidiary is not required to pay United States federal income tax, and our ownership of the stock of a qualified REIT subsidiary does not violate the restrictions on ownership of securities, as described below under “—Asset Tests.”

Ownership of Interests in Taxable REIT Subsidiaries. A taxable REIT subsidiary of ours is a corporation other than a REIT in which we directly or indirectly hold stock and that has made a joint election with us to be treated as a taxable REIT subsidiary. A taxable REIT subsidiary also includes any corporation other than a REIT with respect to which a taxable REIT subsidiary owns securities possessing more than 35% of the total voting power or value of the outstanding securities of such corporation. Other than some activities relating to lodging and health care facilities, a taxable REIT subsidiary may generally engage in any business, including the provision of customary or non-customary services to tenants of its parent REIT. A taxable REIT subsidiary is subject to income tax as a regular C corporation. In addition, a taxable REIT subsidiary of ours may be prevented from deducting interest on debt that we directly or indirectly fund if certain tests regarding the taxable REIT subsidiary’s debt-to-equity ratio and interest expense are satisfied. Our ownership of securities of our taxable REIT subsidiaries will not be subject to the 10% or 5% asset tests described below. See “—Asset Tests.” We currently own interests in Kilroy Realty TRS, Inc., and we have jointly elected with Kilroy Realty TRS, Inc. to have it be treated as a taxable REIT subsidiary. We may acquire interests in additional taxable REIT subsidiaries in the future.

Income Tests. We must satisfy two gross income requirements annually to maintain our qualification as a REIT. First, in each taxable year we must derive directly or indirectly at least 75% of our gross income, excluding gross income from prohibited transactions, certain hedging transactions entered into after July 30, 2008, and certain foreign currency gains recognized after July 30, 2008, from (a) investments relating to real property or mortgages on real property, including “rents from real property” and, in certain circumstances, interest, or (b) certain types of temporary investments. Second, in each taxable year we must derive at least 95% of our gross income, excluding gross income from prohibited transactions, certain hedging transactions entered into on or after January 1, 2005, and certain foreign currency gains recognized after July 30, 2008, from the real property investments described above or dividends, interest and gain from the sale or disposition of stock or securities, or from any combination of the foregoing.

For these purposes, the term “interest” generally does not include any amount received or accrued, directly or indirectly, if the determination of all or some of the amount depends in any way on the income or profits of any person. However, an amount received or accrued generally will not be excluded from the term “interest” solely by reason of being based on a fixed percentage or percentages of receipts or sales.

Rents we receive from a tenant will qualify as “rents from real property” for the purpose of satisfying the gross income requirements for a REIT described above only if all of the following conditions are met:

We generally do not intend, and as a general partner of the operating partnership do not intend to permit the operating partnership, to take actions we believe will cause us to fail to satisfy the rental conditions described above. However, we may intentionally fail to satisfy some of these conditions to the extent such failure will not, based on the advice of our tax counsel, jeopardize our tax status as a REIT. In addition, with respect to the limitation on the rental of personal property, we have not obtained appraisals of the real property and personal property leased to tenants. Accordingly, there can be no assurance that the IRS will agree with our determinations of value.

Income we receive that is attributable to the rental of parking spaces at the properties will constitute rents from real property for purposes of the REIT gross income tests if certain services provided with respect to the parking facilities are performed by independent contractors from whom we derive no income, either directly or indirectly, or by a taxable REIT subsidiary, and certain other conditions are met. We believe that the income we receive that is attributable to parking facilities meets these tests and, accordingly, will constitute rents from real property for purposes of the REIT gross income tests.

From time to time, we may enter into hedging transactions with respect to one or more of our assets or liabilities. The term “hedging transaction” generally means any transaction we enter into in the normal course of our business primarily to manage risk of (1) interest rate changes or fluctuations with respect to borrowings made or to be made by us to acquire or carry real estate assets, or (2) for hedging transactions entered into after July 30, 2008, currency fluctuations with respect to an item of qualifying income under the 75% or 95% gross income test. The hedging activities may include entering into interest rate swaps, caps, and floors, options to purchase these items, and futures and forward contracts. Income we derive from a hedging transaction, including gain from the sale or disposition thereof, that is clearly identified as a hedging transaction as specified in the Code will not constitute gross income and thus will be exempt from the 95% gross income test to the extent such a hedging transaction is entered into on or after January 1, 2005, and will not constitute gross income and thus will be exempt from the 75% gross income test to the extent such hedging transaction is entered into after July 30, 2008.

Income and gain from a hedging transaction, including gain from the sale or disposition of such a transaction, entered into on or prior to July 30, 2008 will be treated as nonqualifying income for purposes of the 75% gross income test. Income and gain from a hedging transaction, including gain from the sale or disposition of such a transaction, entered into prior to January 1, 2005, will be qualifying income for purposes of the 95% gross income test. To the extent that we do not properly identify such transactions as hedges or we hedge with other types of financial instruments, the income from those transactions is not likely to be treated as qualifying income for purposes of the gross income tests. We intend to structure any hedging transactions in a manner that does not jeopardize our status as a REIT.

To the extent our taxable REIT subsidiary, Kilroy Realty TRS, Inc., pays dividends, we generally will derive our allocable share of such dividend income through our interest in the operating partnership. Such dividend income will qualify under the 95%, but not the 75%, REIT gross income test.

We will monitor the amount of the dividend and other income from our taxable REIT subsidiaries and will take actions intended to keep this income, and any other nonqualifying income, within the limitations of the REIT income tests. While we expect these actions will prevent a violation of the REIT income tests, we cannot guarantee that such actions will in all cases prevent such a violation. If we fail to satisfy one or both of the 75% or 95% gross income tests for any taxable year, we may nevertheless qualify as a REIT for the year if we are entitled to relief under certain provisions of the Code. We generally may avail ourselves of the relief provisions if:

It is not possible, however, to state whether in all circumstances we would be entitled to the benefit of these relief provisions. For example, if we fail to satisfy the gross income tests because nonqualifying income that we intentionally accrue or receive exceeds the limits on nonqualifying income, the IRS could conclude that our failure to satisfy the tests was not due to reasonable cause. If these relief provisions do not apply to a particular set of circumstances, we will not qualify as a REIT. As discussed above in “—Taxation of the Company—General,” even if these relief provisions apply, and we retain our status as a REIT, a tax would be imposed with respect to our nonqualifying income. We may not always be able to comply with the gross income tests for REIT qualification despite periodic monitoring of our income.

Prohibited Transaction Income. Any gain that we realize on the sale of property held as inventory or otherwise held primarily for sale to customers in the ordinary course of business, including our share of any such gain realized by the operating partnership, either directly or through its subsidiary partnerships and limited liability companies, will be treated as income from a prohibited transaction that is subject to a 100% penalty tax. This prohibited transaction income may also adversely affect our ability to satisfy the income tests for qualification as a REIT. Under existing law, whether property is held as inventory or primarily for sale to customers in the ordinary course of a trade or business is a question of fact that depends on all the facts and circumstances surrounding the particular transaction. We intend to hold our properties for investment with a view to long-term appreciation, to engage in the business of acquiring, developing and owning properties and to make occasional sales of the properties consistent with our investment objectives. We do not intend to enter into any sales that are prohibited transactions. However, the IRS may successfully contend that some or all of the sales made by us or by our subsidiary partnerships or limited liability companies are prohibited transactions. We would be required to pay the 100% penalty tax on our allocable share of the gains from any such sales.

Penalty Tax. Any redetermined rents, redetermined deductions or excess interest we generate will be subject to a 100% penalty tax. In general, redetermined rents are rents from real property that are overstated as a result of any services furnished to any of our tenants by one of our taxable REIT subsidiaries, and redetermined

deductions and excess interest represent any amounts that are deducted by a taxable REIT subsidiary for amounts paid to us that are in excess of the amounts that would have been deducted based on arm’s length negotiations. Rents we receive will not constitute redetermined rents if they qualify for certain safe harbor provisions contained in the Code.

We believe that, in all instances in which Kilroy Realty TRS, Inc. provides services to our tenants, the fees paid to Kilroy Realty TRS, Inc. for such services are at arm’s-length rates, although the fees paid may not satisfy the safe-harbor provisions contained in the Code. These determinations are inherently factual, and the IRS has broad discretion to assert that amounts paid between related parties should be reallocated to clearly reflect their respective incomes. If the IRS successfully made such an assertion, we would be required to pay a 100% penalty tax on the excess of an arm’s-length fee for tenant services over the amount actually paid.

Asset Tests. At the close of each quarter of our taxable year, we must also satisfy four tests relating to the nature and diversification of our assets.

First, at least 75% of the value of our total assets, including assets held by our qualified REIT subsidiaries and our allocable share of the assets held by the operating partnership and its subsidiary partnerships and other entities treated as partnerships for United States federal income tax purposes, must be represented by real estate assets, cash, cash items and government securities. For purposes of this test, the term “real estate assets” generally means real property (including interests in real property and interests in mortgages on real property) and shares (or transferable certificates of beneficial interest) in other REITs, as well as any stock or debt instrument attributable to investment of the proceeds of a stock offering or a public offering of debt with a term of at least five years, but only for the one-year period beginning on the date we receive such proceeds.

Second, not more than 25% of the value of our total assets may be represented by securities, other than those securities includable in the 75% asset test.

Third, of the investments included in the 25% asset class, and except for investments in other REITs, our qualified REIT subsidiaries and our taxable REIT subsidiaries, the value of any one issuer’s securities may not exceed 5% of the value of our total assets and we may not own more than 10% of the total vote or value of the outstanding securities of any one issuer, except, in the case of the 10% value test, securities satisfying the “straight debt” safe-harbor. Certain types of securities we may own are disregarded as securities solely for purposes of the 10% value test, including but not limited to, any loan to an individual or an estate, any obligation to pay rents from real property and any security issued by a REIT. In addition, solely for purposes of the 10% value test, the determination of our interest in the assets of a partnership or limited liability company in which we own an interest will be based on our proportionate interest in any securities issued by the partnership or limited liability company, excluding for this purpose, certain securities described in the Code.

Fourth, not more than 25% (20% for taxable years beginning before January 1, 2009) of the value of our total assets may be represented by the securities of one or more taxable REIT subsidiaries.

The operating partnership owns 100% of the outstanding stock of Kilroy Realty TRS, Inc. Kilroy Realty TRS, Inc. elected, together with us, to be treated as a taxable REIT subsidiary. So long as Kilroy Realty TRS, Inc. qualifies as our taxable REIT subsidiary, we will not be subject to the 5% asset test, the 10% voting securities limitation or the 10% value limitation with respect to our ownership of securities in Kilroy Realty TRS, Inc. We or Kilroy Realty TRS, Inc. may acquire securities in other taxable REIT subsidiaries in the future. We believe that the aggregate value of our taxable REIT subsidiaries will not exceed 25% (or 20% for taxable years beginning before January 1, 2009) of the aggregate value of our gross assets. With respect to each issuer in which we currently own an interest that does not qualify as a REIT, a qualified REIT subsidiary or a taxable REIT subsidiary, we believe that our ownership of the securities of any such issuer has complied with the 5% asset test, the 10% voting securities limitation, 10% value limitation, and the 75% asset test. No independent appraisals have been obtained to support these conclusions. In addition, there can be no assurance that the IRS will not disagree with our determinations of value.

The asset tests described above must be satisfied at the close of each calendar quarter of our taxable year in which we (directly or through the operating partnership or our subsidiary partnerships and limited liability companies) acquire securities in the applicable issuer, and also at the close of each calendar quarter in which we increase our ownership of securities of such issuer (including as a result of increasing our interest in the operating partnership or in our subsidiary partnerships and limited liability companies). For example, our indirect ownership of securities of each issuer will increase as a result of our capital contributions to the operating partnership and as limited partners exercise their redemption/exchange rights. After initially meeting the asset tests at the close of any quarter, we will not lose our status as a REIT for failure to satisfy the asset tests at the end of a later quarter solely by reason of changes in asset values. If we fail to satisfy an asset test because we acquire securities or other property during a quarter (including as a result of an increase in our interests in the operating partnership or in our subsidiary partnerships and limited liability companies), we may cure this failure by disposing of sufficient nonqualifying assets within 30 days after the close of that quarter. We believe that we have maintained and intend to maintain adequate records of the value of our assets to ensure compliance with the asset tests. In addition, we intend to take such actions within 30 days after the close of any quarter as may be required to cure any noncompliance.

Certain relief provisions may be available to us if we fail to satisfy the asset tests described above after the 30 day cure period. Under these provisions, we will be deemed to have met the 5% and 10% REIT asset tests if the value of our nonqualifying assets (i) does not exceed the lesser of (a) 1% of the total value of our assets at the end of the applicable quarter or (b) $10,000,000, and (ii) we dispose of the nonqualifying assets or otherwise satisfy such asset tests within (a) six months after the last day of the quarter in which the failure to satisfy the asset tests is discovered or (b) the period of time prescribed by Treasury regulations to be issued. For violations of any of the asset tests due to reasonable cause and not due to willful neglect and that are, in the case of the 5% and 10% asset test, in excess of the de minimis exception described above, we may avoid disqualification as a REIT, after the 30 day cure period, by taking steps including (i) the disposition of sufficient nonqualifying assets, or the taking of other actions, which allow us to meet the asset tests within (a) six months after the last day of the quarter in which the failure to satisfy the asset tests is discovered or (b) the period of time prescribed by Treasury regulations to be issued, and (ii) disclosing certain information to the IRS. In such case, we will be required to pay a tax equal to the greater of (a) $50,000 or (b) the highest corporate tax rate multiplied by the net income generated by the nonqualifying assets.

Although we believe that we have satisfied the asset tests described above and plan to take steps to ensure that we satisfy such tests for any quarter with respect to which retesting is to occur, there can be no assurance that we will always be successful, or will not require a reduction in the operating partnership’s overall interest in an issuer (including in a taxable REIT subsidiary). If we fail to cure any noncompliance with the asset tests in a timely manner, and the relief provisions described above are not available, we would cease to qualify as a REIT. See “—Failure to Qualify” below.

Annual Distribution Requirements. To maintain our qualification as a REIT, we are required to distribute dividends, other than capital gain dividends, to our stockholders in an amount at least equal to the sum of:

For these purposes, our “real estate investment trust taxable income” is computed without regard to the dividends paid deduction and our net capital gain. In addition, for purposes of this test, non-cash income means income attributable to leveled stepped rents, original issue discount, cancellation of indebtedness or a like-kind exchange that is later determined to be taxable.

Also, our “REIT taxable income” will be reduced by any taxes we are required to pay on any gain we recognize from the disposition of any asset we acquired from a corporation which is or has been a C corporation in a transaction

in which our basis in the asset is less than the fair market value of the asset, in each case determined at the time we acquired the asset, within the ten-year period following our acquisition of such asset. See “—General” above.

We generally must pay, or be treated as paying, the distributions described above in the taxable year to which they relate. At our election, a distribution for a taxable year may be declared before we timely file our tax return for such year and paid on or before the first regular dividend payment after such declaration, provided such payment is made during the twelve-month period following the close of such year. These distributions generally are taxable to our stockholders, other than tax-exempt entities, in the year in which paid. This is so even though these distributions relate to the prior year for purposes of the 90% distribution requirement. The amount distributed must not be preferential (i.e., every stockholder of the class of stock to which a distribution is made must be treated the same as every other stockholder of that class, and no class of stock may be treated other than in according to its dividend rights as a class). To the extent that we do not distribute all of our net capital gain or distribute at least 90%, but less than 100%, of our “real estate investment trust taxable income,” as adjusted, we will be required to pay tax on the undistributed amount at regular corporate tax rates. We believe we have made, and intend to continue to make, timely distributions sufficient to satisfy these annual distribution requirements and to minimize our corporate tax obligations. In this regard, the partnership agreement of the operating partnership authorizes us, as general partner of the operating partnership, to take such steps as may be necessary to cause the operating partnership to distribute to its partners an amount sufficient to permit us to meet these distribution requirements.

We expect that our real estate investment trust taxable income will be less than our cash flow because of depreciation and other non-cash charges included in computing real estate investment trust taxable income. Accordingly, we anticipate that we will generally have sufficient cash or liquid assets to enable us to satisfy the distribution requirements described above. However, from time to time, we may not have sufficient cash or other liquid assets to meet these distribution requirements due to timing differences between the actual receipt of income and actual payment of deductible expenses, and the inclusion of income and deduction of expenses in arriving at our taxable income. If these timing differences occur, we may be required to borrow funds to pay cash dividends or to pay dividends in the form of taxable stock dividends in order to meet the distribution requirements, while preserving our cash. In addition, we may decide to retain our cash, rather than distribute it, in order to repay debt or for other reasons.

Under some circumstances, we may be able to rectify an inadvertent failure to meet the 90% distribution requirement for a year by paying “deficiency dividends” to our stockholders in a later year, which may be included in our deduction for dividends paid for the earlier year. Thus, we may be able to avoid being taxed on amounts distributed as deficiency dividends, subject to the 4% excise tax described below. However, we will be required to pay interest to the IRS based upon the amount of any deduction claimed for deficiency dividends.

Furthermore, we will be required to pay a 4% excise tax to the extent we fail to distribute during each calendar year, at least the sum of 85% of our real estate investment trust ordinary income for such year, 95% of our real estate investment trust capital gain net income for the year and any undistributed taxable income from prior periods. Any real estate investment trust taxable income and net capital gain on which this excise tax is imposed for any year is treated as an amount distributed during that year for purposes of calculating such tax.

For purposes of the distribution requirements and excise tax described above, dividends declared during the last three months of the taxable year, payable to stockholders of record on a specified date during such period, and paid during January of the following year, will be treated as paid by us and received by our stockholders on December 31 of the year in which they are declared.

Like-Kind Exchanges. We have in the past disposed of properties in transactions intended to qualify as like-kind exchanges under the Code, and may continue this practice in the future. Such like-kind exchanges are intended to result in the deferral of gain for United States federal income tax purposes. The failure of any such

transaction to qualify as a like-kind exchange could subject us to United States federal income tax, possibly including the 100% prohibited transaction tax, depending on the facts and circumstances surrounding the particular transaction.

Specified cure provisions are available to us in the event that we discover a violation of a provision of the Code that would result in our failure to qualify as a REIT. Except with respect to violations of the REIT income tests and asset tests (for which the cure provisions are described above), and provided the violation is due to reasonable cause and not due to willful neglect, these cure provisions generally impose a $50,000 penalty for each violation in lieu of a loss of REIT status.

If we fail to qualify for taxation as a REIT in any taxable year, and the relief provisions do not apply, we will be required to pay tax, including any applicable alternative minimum tax, on our taxable income at regular corporate rates. Distributions to stockholders in any year in which we fail to qualify as a REIT will not be deductible by us, and we will not be required to distribute any amounts to our stockholders. As a result, we anticipate that our failure to qualify as a REIT would reduce the cash available for distribution by us to our stockholders. In addition, if we fail to qualify as a REIT, all distributions to stockholders will be taxable as regular corporate dividends to the extent of our current and accumulated earnings and profits. In this event, corporate distributees may be eligible for the dividends-received deduction. In addition, individuals may be eligible for the preferential rates on qualified dividend income. Unless entitled to relief under specific statutory provisions, we will also be disqualified from taxation as a REIT for the four taxable years following the year during which we lost our qualification. It is not possible to state whether in all circumstances we would be entitled to this statutory relief.

Tax Aspects of the Operating Partnership, the Subsidiary Partnerships and Limited Liability Companies

General. Substantially all of our investments are held indirectly through the operating partnership. In addition, the operating partnership holds certain of its investments indirectly through subsidiary partnerships and limited liability companies which we expect will be treated as partnerships or disregarded entities for United States federal income tax purposes. In general, entities that are classified as partnerships (or disregarded entities) for United States federal income tax purposes are “pass-through” entities which are not required to pay United States federal income tax. Rather, partners or members of such entities are allocated their shares of the items of income, gain, loss, deduction and credit of the entity, and are potentially required to pay tax on this income, without regard to whether the partners or members receive a distribution of cash from the entity. We will include in our income our proportionate share of the foregoing items for purposes of the various REIT income tests and in the computation of our real estate investment trust taxable income. Moreover, as described above under “—Asset Tests,” for purposes of the REIT asset tests, we will generally include our proportionate share of assets held by the operating partnership, including its share of assets held by its subsidiary partnerships and limited liability companies, based on our capital interests. See “—Taxation of the Company.”

Entity Classification. Our interests in the operating partnership and its subsidiary partnerships and limited liability companies involve special tax considerations, including the possibility that the IRS might challenge the status of any of these entities as a partnership (or disregarded entity), as opposed to an association taxable as a corporation for United States federal income tax purposes. If the operating partnership, a subsidiary partnership or a limited liability company were treated as an association, it would be taxable as a corporation and would be required to pay an entity-level tax on its income. In this situation, the character of our assets and items of gross income would change and could preclude us from satisfying the asset tests and possibly the income tests (see “—Taxation of the Company—Asset Tests” and “—Income Tests”). This, in turn, could prevent us from qualifying as a REIT. See “—Failure to Qualify” for a discussion of the effect of our failure to meet these tests for a taxable year. In addition, a change in the operating partnership’s, a subsidiary partnership’s or a subsidiary limited liability company’s status for tax purposes might be treated as a taxable event. If so, we might incur a tax liability without any related cash distributions.

The Company believes the operating partnership and each of its other partnerships and limited liability companies will be classified as partnerships or disregarded entities for United States federal income tax purposes.

Allocations of Income, Gain, Loss and Deduction. A partnership or limited liability company agreement will generally determine the allocation of income and losses among partners or members. These allocations, however, will be disregarded for tax purposes if they do not comply with the provisions of Section 704(b) of the Code and the related Treasury regulations. Generally, Section 704(b) of the Code and the related Treasury regulations require that partnership and limited liability company allocations respect the economic arrangement of the partners or members.

The partnership agreement of the operating partnership provides for preferred distributions of cash and preferred allocations of income to the holders of its preferred units. Preferred units have been issued to us in connection with our issuance of preferred stock. Upon our issuance of additional shares of preferred stock for cash or other consideration, we will contribute the net proceeds or other consideration from such issuance to the operating partnership in exchange for additional preferred units with similar terms. In general, all remaining items of income and loss will be allocated to the holders of common units in proportion to the number of common units held by each unit holder. See the discussion under “Description of Material Provisions of the Partnership Agreement of Kilroy Realty, L.P.—Allocations of Net Income and Net Losses to Partners” included elsewhere in this prospectus, describing the allocations of net income and net losses to partners required pursuant to the partnership agreement of the operating partnership. Some limited partners have agreed to guarantee debt of the operating partnership, either directly or indirectly through an agreement to make capital contributions to the operating partnership under limited circumstances. As a result, and notwithstanding the above discussion of allocations of income and loss to holders of common units, these limited partners could under limited circumstances be allocated a disproportionate amount of net loss of the operating partnership or a disproportionate amount of net income of the operating partnership to offset any such allocations of net loss.

If an allocation is not recognized by the IRS for United States federal income tax purposes, the item subject to the allocation will be reallocated in accordance with the partners’ or members’ interests in the partnership or limited liability company. This reallocation will be determined by taking into account all of the facts and circumstances relating to the economic arrangement of the partners or members with respect to such item. The operating partnership’s allocations of taxable income and loss are intended to comply with the requirements of Section 704(b) of the Code and the Treasury regulations promulgated thereunder.

Tax Allocations with Respect to the Properties. Under Section 704(c) of the Code, income, gain, loss and deduction attributable to appreciated or depreciated property that is contributed to a partnership or limited liability company in exchange for an interest in the partnership or limited liability company, must be allocated in a manner so that the contributing partner or member is charged with the unrealized gain, or benefits from the unrealized loss, associated with the property at the time of the contribution, as adjusted from time to time. The amount of the unrealized gain or unrealized loss is generally equal to the difference between the fair market value or book value and the adjusted tax basis of the property at the time of contribution. These allocations are solely for United States federal income tax purposes and do not affect the book capital accounts or other economic or legal arrangements among the partners or members. The operating partnership was formed by way of contributions of appreciated property (i.e., property having an adjusted tax basis less than its fair market value at the time of contribution). Moreover, subsequent to the formation of the operating partnership, additional appreciated property has been contributed to the operating partnership in exchange for interests in the operating partnership. The partnership agreement requires that these allocations be made in a manner consistent with Section 704(c) of the Code.

Treasury regulations issued under Section 704(c) of the Code provide partnerships and limited liability companies with a choice of several methods of accounting for book-tax differences, including retention of the “traditional method” or the election of certain methods which would permit any distortions caused by a book-tax difference to be entirely rectified on an annual basis or with respect to a specific taxable transaction such as a sale. We and the operating partnership have determined to use the “traditional method” for accounting for book-tax differences for the properties initially contributed to the operating partnership and for certain assets

contributed subsequently. We and the operating partnership have not yet decided what method will be used to account for book-tax differences for properties acquired by the operating partnership in the future.

In general, the partners of the operating partnership who acquired their limited partnership interests through a contribution of appreciated property will be allocated depreciation deductions for tax purposes that are lower than such deductions would have been if they had been determined on a pro rata basis. In addition, in the event of the disposition of any of the contributed assets which have such a book-tax difference, all income attributable to such book-tax difference (as adjusted) generally will be allocated to the contributing partners. These allocations will tend to eliminate the book-tax difference over the life of the operating partnership. However, under the traditional method, the special allocation rules of Section 704(c) of the Code do not always entirely eliminate the book-tax difference on an annual basis or with respect to a specific taxable transaction such as a sale. Thus, the carryover basis of the contributed assets in the hands of the operating partnership may cause us or other partners to be allocated lower depreciation and other deductions, and possibly an amount of taxable income in the event of a sale of such contributed assets in excess of the economic or book income allocated to us or other partners as a result of the sale. Such an allocation might cause us or other partners to recognize taxable income in excess of cash proceeds, which might adversely affect our ability to comply with the REIT distribution requirements. See “—Taxation of the Company—Requirements for Qualification as a Real Estate Investment Trust” and “—Annual Distribution Requirements.”

Any property acquired by the operating partnership in a taxable transaction will initially have a tax basis equal to its fair market value, and Section 704(c) of the Code will not apply.

Material United States Federal Income Tax Consequences for Holders of Our Capital Stock and the Operating Partnership’s Debt Securities

The following discussion is a summary of certain United States federal income tax consequences to you of acquiring, owning and disposing of our capital stock or the operating partnership’s debt securities. This discussion is limited to holders who hold our capital stock or the operating partnership’s debt securities as “capital assets” within the meaning of Section 1221 of the Code (generally, property held for investment). This discussion does not address all of the United States federal income tax consequences relevant to a holder’s particular circumstances, including the impact of the tax on net investment income imposed by Section 1411 of the Code. In addition, it does not address consequences relevant to holders subject to particular rules, including, without limitation:

If an entity treated as a partnership for United States federal income tax purposes) holds our capital stock or the operating partnership’s debt securities, the tax treatment of a partner in the partnership will depend on the status of the partner, the activities of the partnership and certain determinations made at the partner level. Accordingly, partnerships holding our capital stock or the operating partnership’s debt securities and the partners in such partnerships should consult their tax advisors regarding the United States federal income tax consequences to them.

THIS DISCUSSION IS FOR INFORMATIONAL PURPOSES ONLY AND IS NOT INTENDED AS TAX ADVICE. INVESTORS SHOULD CONSULT THEIR TAX ADVISORS WITH RESPECT TO THE APPLICATION OF THE UNITED STATES FEDERAL INCOME TAX LAWS TO THEIR PARTICULAR SITUATIONS AS WELL AS ANY TAX CONSEQUENCES OF THE PURCHASE, OWNERSHIP AND DISPOSITION OF OUR CAPITAL STOCK OR THE OPERATING PARTNERSHIP’S DEBT SECURITIES ARISING UNDER OTHER UNITED STATES FEDERAL TAX LAWS (INCLUDING ESTATE AND GIFT TAX LAWS), UNDER THE LAWS OF ANY STATE, LOCAL OR NON-UNITED STATES TAXING JURISDICTION OR UNDER ANY APPLICABLE TAX TREATY.

For purposes of this discussion, a “United States holder” is a beneficial holder of shares of our capital stock or the operating partnership’s debt securities that, for United States federal income tax purposes, is or is treated as:

For purposes of this discussion, a “non-United States holder” is any beneficial owner of our capital stock or the operating partnership’s debt securities that is neither a United States holder nor an entity treated as a partnership for United States federal income tax purposes.

Distributions Generally. Distributions out of our current or accumulated earnings and profits, other than capital gain dividends and certain amounts previously subject to corporate level taxation as discussed below, will constitute dividends taxable to our taxable United States holders as ordinary income when actually or constructively received. See “—Tax Rates” below. As long as we qualify as a REIT, these distributions will not be eligible for the dividends-received deduction in the case of United States holders that are corporations or, except to the extent provided in “—Tax Rates” below, the preferential rates on qualified dividend income applicable to individuals. For purposes of determining whether distributions to holders of our stock are out of current or accumulated earnings and profits, our earnings and profits will be allocated first to our outstanding preferred stock and then to our outstanding common stock.

To the extent that we make distributions on our capital stock in excess of our current and accumulated earnings and profits, these distributions will be treated first as a tax-free return of capital to a United States holder. This treatment will reduce the United States holder’s adjusted tax basis in its shares of our capital stock by the amount of the distribution, but not below zero. Distributions in excess of our current and accumulated earnings and profits and in excess of a United States holder’s adjusted tax basis in its shares will be taxable as capital gain. Such gain will be taxable as long-term capital gain if the shares have been held for more than one year. Dividends we declare in October, November, or December of any year and which are payable to a

stockholder of record on a specified date in any of these months will be treated as both paid by us and received by the stockholder on December 31 of that year, provided we actually pay the dividend on or before January 31 of the following year. United States holders may not include in their own income tax returns any of our net operating losses or capital losses.

United States holders who receive taxable stock dividends, as described above under “Taxation of the Company—Annual Distribution Requirements,” including dividends partially payable in our capital stock and partially payable in cash, would be required to include the full amount of the dividend (i.e., the cash and the stock portion) as ordinary income (subject to limited exceptions) to the extent of our current and accumulated earnings and profits for United States federal income tax purposes, as described above. The amount of any dividend payable in our capital stock generally is equal to the amount of cash that could have been received instead of the capital stock. Depending on the circumstances of a United States holder, the tax on the distribution may exceed the amount of the distribution received in cash, in which case such a United States holder would have to pay the tax using cash from other sources. If a United States holder sells the capital stock it receives as a dividend in order to pay this tax and the sales proceeds are less than the amount required to be included in income with respect to the dividend, such United States holder could have a capital loss with respect to the capital stock sale that could not be used to offset such dividend income. A United States holder that receives capital stock pursuant to a distribution generally has a tax basis in such capital stock equal to the amount of cash that could have been received instead of such capital stock as described above, and has a holding period in such capital stock that begins on the day immediately following the payment date for the distribution.

Capital Gain Dividends. Dividends that we properly designate as capital gain dividends will be taxable to our taxable United States holders as a gain from the sale or disposition of a capital asset, to the extent that such gain does not exceed our actual net capital gain for the taxable year. If we properly designate any portion of a dividend as a capital gain dividend then, except as otherwise required by law, we presently intend to allocate a portion of the total capital gain dividends paid or made available to holders of all classes of our capital stock for the year to the holders of each class of our capital stock in proportion to the amount that our total dividends, as determined for United States federal income tax purposes, paid or made available to the holders of each such class of stock for the year bears to the total dividends, as determined for United States federal income tax purposes, paid or made available to holders of all classes of our capital stock for the year.

Retention of Net Capital Gains. We may elect to retain, rather than distribute as a capital gain dividend, all or a portion of our net capital gains. If we make this election, we would pay tax on our retained net capital gains. In addition, to the extent we so elect, a United States holder generally would:

Passive Activity Losses and Investment Interest Limitations. Distributions we make and gain arising from the sale or exchange by a United States holder of our capital stock will not be treated as passive activity income. As a result, United States holders generally will not be able to apply any “passive losses” against this income or gain. A United States holder may elect to treat capital gain dividends, capital gains from the disposition of stock and qualified dividend income as investment income for purposes of computing the investment interest

limitation, but in such case, the stockholder will be taxed at ordinary income rates on such amount. Other distributions made by us, to the extent they do not constitute a return of capital, generally will be treated as investment income for purposes of computing the investment interest limitation.

Dispositions of Our Capital Stock. If a United States holder sells or disposes of shares of capital stock to a person other than us, it will recognize gain or loss for United States federal income tax purposes in an amount equal to the difference between the amount of cash and the fair market value of any property received on the sale or other disposition and the holder’s adjusted tax basis in the shares for tax purposes. This gain or loss, except as provided below, will be long-term capital gain or loss if the holder has held the capital stock for more than one year at the time of such sale or disposition. However, if a United States holder recognizes loss upon the sale or other disposition of capital stock that it has held for six months or less, after applying certain holding period rules, the loss recognized will be treated as a long-term capital loss to the extent the United States holder received distributions from us which were required to be treated as long-term capital gains.

Redemption or Repurchase by Us. A redemption or repurchase of shares of our stock will be treated under Section 302 of the Code as a distribution taxable as a dividend to the extent of our current and accumulated earnings and profits at ordinary income rates unless the redemption or repurchase satisfies one of the tests set forth in Section 302(b) of the Code and is therefore treated as a sale or exchange of the redeemed or repurchased shares. The redemption or repurchase will be treated as a sale or exchange if it:

In determining whether any of these tests have been met, shares of capital stock, including common stock and other equity interests in us, considered to be owned by the United States holder by reason of certain constructive ownership rules set forth in the Code, as well as shares of our capital stock actually owned by the United States holder, must generally be taken into account. Because the determination as to whether any of the alternative tests of Section 302(b) of the Code will be satisfied with respect to the United States holder depends upon the facts and circumstances at the time that the determination must be made, United States holders are advised to consult their tax advisors to determine such tax treatment.

If a redemption or repurchase of shares of our stock is treated as a distribution taxable as a dividend, the amount of the distribution will be measured by the amount of cash and the fair market value of any property received. See “—Distributions Generally.” A United States holder’s adjusted basis in the redeemed or repurchased shares of the stock for tax purposes will be transferred to its remaining shares of our capital stock, if any. If a United States holder owns no other shares of our capital stock, such basis may, under certain circumstances, be transferred to a related person or it may be lost entirely. Proposed Treasury regulations issued in 2009, if enacted in their current form, would affect the basis recovery rules described above. It is not clear whether these proposed regulations will be enacted in their current form or at all. Prospective investors should consult their tax advisors regarding the federal income tax consequences of a redemption or repurchase of our capital stock.

If a redemption or repurchase of shares of our stock is not treated as a distribution taxable as a dividend, it will be treated as a taxable sale or exchange in the manner described under “—Dispositions of Our Capital Stock.”

Backup Withholding. We report to our United States holders and the IRS the amount of dividends paid during each calendar year, and the amount of any tax withheld. Under the backup withholding rules, a United States holder may be subject to backup withholding with respect to dividends paid unless the United States holder is a corporation or comes within certain other exempt categories and, when required,

demonstrates this fact, or provides a taxpayer identification number, certifies as to no loss of exemption from backup withholding, and otherwise complies with applicable requirements of the backup withholding rules. A United States holder that does not provide us with its correct taxpayer identification number may also be subject to penalties imposed by the IRS. Backup withholding is not an additional tax. Any amount paid as backup withholding will be creditable against the United States holder’s United States federal income tax liability, provided the required information is timely furnished to the IRS. In addition, we may be required to withhold a portion of capital gain distributions to any holders who fail to certify their non-foreign status. See “—Taxation of Non-United States Holders of our Capital Stock.”

Foreign Accounts. Certain payments made to “foreign financial institutions” in respect of accounts of United States holders at such financial institutions may be subject to withholding at a rate of 30%. United States holders should consult their tax advisors regarding the effect, if any, of these withholding provisions on their ownership and disposition of our capital stock. See “—Foreign Accounts.”

Dividend income from us and gain arising upon a sale of our capital stock generally will not be unrelated business taxable income to a tax-exempt stockholder, except as described below. This income or gain will be unrelated business taxable income, however, if a tax-exempt stockholder holds its shares as “debt-financed property” within the meaning of the Code. Generally, debt-financed property is property, the acquisition or holding of which was financed through a borrowing by the tax-exempt stockholder.

For tax-exempt stockholders which are social clubs, voluntary employee benefit associations, supplemental unemployment benefit trusts, or qualified group legal services plans exempt from United States federal income taxation under Sections 501(c)(7), (c)(9), (c)(17) or (c)(20) of the Code, respectively, income from an investment in our capital stock will constitute unrelated business taxable income unless the organization is able to properly claim a deduction for amounts set aside or placed in reserve for specific purposes so as to offset the income generated by its investment in our capital stock. These prospective investors should consult their tax advisors concerning these “set aside” and reserve requirements.

Notwithstanding the above, however, a portion of the dividends paid by a “pension-held REIT” may be treated as unrelated business taxable income as to some trusts that hold more than 10%, by value, of the interests in the REIT. A REIT will not be a “pension-held REIT” if it is able to satisfy the “not closely held” requirement without relying on the “look-through” exception with respect to certain trusts, or if such REIT is not “predominantly held” by “qualified trusts.” As a result of limitations on the transfer and ownership of stock contained in our charter, we do not expect to be classified as a “pension-held REIT,” and as a result, the tax treatment described in this paragraph should be inapplicable to our stockholders. However, because our stock will be publicly traded, we cannot guarantee that this will always be the case.

The following discussion addresses the rules governing United States federal income taxation of the ownership and disposition of our capital stock by non-United States holders. These rules are complex, and no attempt is made herein to provide more than a brief summary of such rules. Accordingly, the discussion does not address all aspects of United States federal income taxation and does not address any state, local or foreign tax consequences that may be relevant to a non-United States holder in light of its particular circumstances. We urge non-United States holders to consult their tax advisors to determine the impact of United States federal, state, local and foreign income tax laws on the acquisition, ownership, and disposition of shares of our capital stock, including any reporting requirements.

Distributions Generally. Distributions that are neither attributable to gain from our sale or exchange of United States real property interests nor designated by us as capital gain dividends will be treated as dividends of ordinary income to the extent that they are made out of our current or accumulated earnings and profits. Such

distributions ordinarily will be subject to withholding of United States federal income tax at a 30% rate or such lower rate as may be specified by an applicable income tax treaty unless the distributions are treated as effectively connected with the conduct by the non-United States holder of a United States trade or business. Under certain treaties, however, lower withholding rates generally applicable to dividends do not apply to dividends from a REIT. Certain certification and disclosure requirements must be satisfied to be exempt from withholding under the effectively connected income exemption. Dividends that are treated as effectively connected with such a trade or business will be subject to tax on a net basis at graduated rates, in the same manner as dividends paid to United States holders are subject to tax, and are generally not subject to withholding. Any such dividends received by a non-United States holder that is a corporation may also be subject to an additional branch profits tax at a 30% rate (applicable after deducting United States federal income taxes paid on such effectively connected income) or such lower rate as may be specified by an applicable income tax treaty.

For withholding purposes, we expect to treat all distributions as made out of our current or accumulated earnings and profits. As a result, except as otherwise provided below, we expect to withhold United States income tax at the rate of 30% on any distributions made to a non-United States holder unless:

However, amounts withheld should generally be refundable if it is subsequently determined that the distribution was, in fact, in excess of our current and accumulated earnings and profits, provided that certain conditions are met.

Distributions in excess of our current and accumulated earnings and profits will not be taxable to a non-United States holder to the extent that such distributions do not exceed the non-United States holder’s adjusted basis in our capital stock, but rather will reduce the adjusted basis of such capital stock. To the extent that these distributions exceed a non-United States holder’s adjusted basis in our capital stock, they will give rise to gain from the sale or exchange of such stock. The tax treatment of this gain is described below.

Capital Gain Dividends and Distributions Attributable to a Sale or Exchange of United States Real Property Interests. Distributions to a non-United States holder that we properly designate as capital gain dividends, other than those arising from the disposition of a United States real property interest, generally should not be subject to United States federal income taxation, unless:

Pursuant to the Foreign Investment in Real Property Tax Act, or FIRPTA, distributions to a non-United States holder that are attributable to gain from our sale or exchange of United States real property interests (whether or not designated as capital gain dividends) will cause the non-United States holder to be treated as recognizing such gain as income effectively connected with a United States trade or business. Non-United States holders would generally be taxed at the same rates applicable to United States holders. We also will be required to withhold and to remit to the IRS 35% (or 20% to the extent provided in Treasury regulations) of any distribution to non-United States holders to the extent attributable to gain from sales or exchanges by us of USRPIs. The amount withheld is creditable against the non-United States holder’s United States federal income

tax liability. However, any distribution with respect to any class of stock which is regularly traded on an established securities market located in the United States is not subject to FIRPTA, and therefore, not subject to the 35% United States withholding tax described above, if the non-United States holder did not own more than 5% of such class of stock at any time during the one-year period ending on the date of the distribution. Instead, such distributions generally will be treated in the same manner as ordinary dividend distributions.

Retention of Net Capital Gains. Although the law is not clear on the matter, it appears that amounts we designate as retained capital gains in respect of the capital stock held by United States holders generally should be treated with respect to non-United States holders in the same manner as actual distributions by us of capital gain dividends. Under this approach, a non-United States holder would be able to offset as a credit against its United States federal income tax liability resulting from its proportionate share of the tax we pay on such retained capital gains, and to receive from the IRS a refund to the extent its proportionate share of such tax paid by us exceeds its actual United States federal income tax liability.

Sale of Our Capital Stock. Gain recognized by a non-United States holder upon the sale or exchange of our capital stock generally will not be subject to United States federal income taxation unless such stock constitutes a “United States real property interest” within the meaning of FIRPTA. Our capital stock will not constitute a “United States real property interest” so long as we are a “domestically-controlled qualified investment entity.” A “domestically-controlled qualified investment entity” includes a REIT in which at all times during a specified testing period less than 50% in value of its stock is held directly or indirectly by non-United States holders. We believe, but cannot guarantee, that we have been a “domestically-controlled qualified investment entity.” Even if we have been a “domestically-controlled qualified investment entity,” because our capital stock is publicly traded, no assurance can be given that we will continue to be a “domestically-controlled qualified investment entity.”

Notwithstanding the foregoing, gain from the sale or exchange of our capital stock not otherwise subject to FIRPTA will be taxable to a non-United States holder if either (1) the investment in our capital stock is treated as effectively connected with the non-United States holder’s United States trade or business or (2) the non-United States holder is a nonresident alien individual who is present in the United States for 183 days or more during the taxable year and certain other conditions are met. In addition, in general, even if we are a domestically controlled qualified investment entity, upon disposition of our capital stock, a non-United States holder may be treated as having gain from the sale or exchange of United States real property interest if the non-United States holder (or certain of its affiliate or related parties) (1) disposes of our capital stock within a 30-day period preceding the ex-dividend date of a distribution, any portion of which, but for the disposition, would have been treated as gain from the sale or exchange of a United States real property interest and (2) acquires, or enters into a contract or option to acquire, or is deemed to acquire, other shares of our capital stock during the 61-day period beginning with the first day of the 30-day period described in clause (1). The preceding sentence shall not apply to a non-United States holder if the non-United States holder did not own more than 5% of the stock at any time during the one-year period ending on the date of the distribution described in clause (1) of the preceding sentence and the class of stock as ‘‘regularly traded,’’ as defined by applicable Treasury regulations. Non-United States holders should contact their tax advisors regarding the tax consequences of any sale, exchange, or other taxable disposition of our capital stock.

Even if we do not qualify as a “domestically-controlled qualified investment entity” at the time a non-United States holder sells or exchanges our capital stock, gain arising from such a sale or exchange would not be subject to United States taxation under FIRPTA as a sale of a “United States real property interest” if:

If gain on the sale or exchange of our capital stock were subject to taxation under FIRPTA, the non-United States holder would be subject to regular United States federal income tax with respect to such gain in the same manner as a taxable United States holder. In addition, if the stock is not then traded on an established securities market, the purchaser of the capital stock would be required to withhold and remit to the IRS 10% of the purchase price. If amounts withheld on a sale, redemption, repurchase, or exchange of our capital stock exceed the holder’s substantive tax liability resulting from such disposition, such excess may be refunded or credited against such holder’s United States federal income tax liability, provided that the required information is provided to the IRS on a timely basis. Amounts withheld on any such sale, exchange or other taxable disposition of our capital stock may not satisfy a non-United States holder’s entire tax liability under FIRPTA, and such holder remains liable for the timely payment of any remaining tax liability.

Backup Withholding and Information Reporting. Generally, we must report annually to the IRS the amount of dividends paid to a non-United States holder, such holder’s name and address, and the amount of tax withheld, if any. A similar report is sent to the non-United States holder. Pursuant to tax treaties or other agreements, the IRS may make its reports available to tax authorities in the non-United States holder’s country of residence.

Payments of dividends or of proceeds from the disposition of stock made to a non-United States holder may be subject to information reporting and backup withholding unless such holder establishes an exemption, for example, by properly certifying its non-United States status on an IRS Form W-8BEN or another appropriate version of IRS Form W-8. Notwithstanding the foregoing, backup withholding and information reporting may apply if either the Company has or its paying agent has actual knowledge, or reason to know, that a holder is a United States person. Backup withholding is not an additional tax. Rather, the United States federal income tax liability of persons subject to backup withholding will be reduced by the amount of tax withheld. If withholding results in an overpayment of taxes, a refund or credit may be obtained, provided that the required information is timely furnished to the IRS.

The following summary describes certain material United States federal income tax consequences of acquiring, owning and disposing of debt securities issued by the operating partnership. This discussion assumes the debt securities will be issued with no more than a de minimis amount of original issue discount for United States federal income tax purposes. In addition, this discussion is limited to persons purchasing the debt securities for cash at original issue and at their original “issue price” within the meaning of Section 1273 of the Code (i.e., the first price at which a substantial amount of the debt securities is sold to the public for cash).

Interest. Interest on a debt security generally will be taxable to a United States holder as ordinary income at the time such interest is received or accrued, in accordance with such United States holder’s method of tax accounting for United States federal income tax purposes.

Sale or Other Taxable Disposition of the Debt Securities. A United States holder will recognize gain or loss on the sale, exchange, redemption, retirement or other taxable disposition of a debt security. The amount of such gain or loss will equal the difference between the amount received for the debt security in cash or other property valued at fair market value (less amounts attributable to any accrued but unpaid interest, which generally will be taxable as interest to the extent not previously included in income) and the United States holder’s adjusted tax basis in the debt security. A United States holder’s adjusted tax basis in a debt security generally will be equal to the amount the United States holder paid for the debt security. Any gain or loss will be capital gain or loss, and will be long-term capital gain or loss if the United States holder has held the debt security for more than one year at the time of sale or other taxable disposition. Otherwise, such gain or loss will be short-term capital gain or loss. Long-term capital gains recognized by certain non-corporate United States holders, including individuals, generally will be taxable at a reduced rate. The deductibility of capital losses is subject to limitations.

Information Reporting and Backup Withholding. A United States holder may be subject to information reporting and backup withholding when such holder receives payments on a debt security or receives proceeds from the sale or other taxable disposition of a debt security (including a redemption or retirement of a debt security). Certain United States holders are exempt from backup withholding, including corporations and certain tax-exempt organizations. A United States holder will be subject to backup withholding if such holder is not otherwise exempt and such holder:

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules may be allowed as a refund or a credit against a United States holder’s United States federal income tax liability, provided the required information is timely furnished to the IRS. United States holders should consult their tax advisors regarding their qualification for an exemption from backup withholding and the procedures for obtaining such an exemption.

Non-United States Holders of the Operating Partnership’s Debt Securities

Payments of Interest. Interest paid on a debt security to a non-United States holder that is not effectively connected with the non-United States holder’s conduct of a trade or business within the United States will not be subject to United States federal income tax, or withholding tax of 30% (or such lower rate specified by an applicable income tax treaty), provided that:

If a non-United States holder does not satisfy the requirements above, such non-United States holder may be entitled to a reduction in or an exemption from withholding on such interest as a result of an applicable tax treaty. To claim such entitlement, the non-United States holder must provide the applicable withholding agent with a properly executed IRS Form W-8BEN claiming a reduction in or exemption from withholding tax under the benefit of an income tax treaty between the United States and the country in which the non-United States holder resides or is established.

If interest paid to a non-United States holder is effectively connected with the non-United States holder’s conduct of a trade or business within the United States (and, if required by an applicable income tax treaty, the

non-United States holder maintains a permanent establishment in the United States to which such interest is attributable), the non-United States holder will be exempt from the United States federal withholding tax described above. To claim the exemption, the non-United States holder must furnish to the applicable withholding agent a valid IRS Form W-8ECI, certifying that interest paid on a debt security is not subject to withholding tax because it is effectively connected with the conduct by the non-United States holder of a trade or business within the United States.

Any such effectively connected interest will be subject to United States federal income tax at the regular graduated United States federal income tax rates. In addition, a non-United States holder that is a corporation may be subject to a branch profits tax at a rate of 30% (or such lower rate specified by an applicable income tax treaty) on such effectively connected interest, as adjusted for certain items.

The certifications described above must be provided to the applicable withholding agent prior to the payment of interest and must be updated periodically. Non-United States holders that do not timely provide the applicable withholding agent with the required certification, but that qualify for a reduced rate under an applicable income tax treaty, may obtain a refund of any excess amounts withheld by timely filing an appropriate claim for refund with the IRS. Non-United States holders should consult their tax advisors regarding their entitlement to benefits under any applicable income tax treaty.

Sale or Other Taxable Disposition of the Debt Securities. A non-United States holder will not be subject to United States federal income tax on any gain realized upon the sale, exchange, redemption, retirement or other taxable disposition of a debt security (such amount excludes any amount allocable to accrued and unpaid interest, which generally will be treated as interest and may be subject to the rules discussed above in “—Payments of Interest”) unless:

Gain described in the first bullet point above will be subject to United States federal income tax on a net income basis at the regular graduated United States federal income tax rates. A non-United States holder that is a foreign corporation also may be subject to a branch profits tax at a rate of 30% (or such lower rate specified by an applicable income tax treaty) on such effectively connected gain, as adjusted for certain items.

Gain described in the second bullet point above will be subject to United States federal income tax at a rate of 30% (or such lower rate specified by an applicable income tax treaty), which may be offset by United States source capital losses of the non-United States holder (even though the individual is not considered a resident of the United States), provided the non-United States holder has timely filed United States federal income tax returns with respect to such losses.

Non-United States holders should consult their tax advisors regarding any applicable income tax treaties that may provide for different rules.

Backup Withholding and Information Reporting. Payments of interest generally will not be subject to backup withholding, provided the applicable withholding agent does not have actual knowledge or reason to know the holder is a United States person and the holder certifies its non-United States status as described above under “—Payments of Interest.” However, information returns are required to be filed with the IRS in connection with any interest paid to the non-United States holder, regardless of whether any tax was actually withheld. In addition, proceeds of the sale or other taxable disposition of a debt security (including a retirement or redemption of the debt security) within the United States or conducted through certain United States-related brokers

generally will not be subject to backup withholding or information reporting, if the applicable withholding agent receives the statement described above and does not have actual knowledge or reason to know that such holder is a United States person or the holder otherwise establishes an exemption. Proceeds of a disposition of a debt security paid outside the United States and conducted through a non-United States office of a non-United States broker generally will not be subject to backup withholding or information reporting.

Copies of information returns that are filed with the IRS may also be made available under the provisions of an applicable treaty or agreement to the tax authorities of the country in which the non-United States holder resides or is established.

Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules may be allowed as a refund or a credit against a non-United States holder’s United States federal income tax liability, provided the required information is timely furnished to the IRS.

Beginning January 1, 2013, the maximum tax rate for non-corporate taxpayers for capital gains, including certain “capital gain dividends,” is generally 20% (although depending on the characteristics of the assets that produced these gains and on designations that we may make, certain capital gain dividends may be taxed at a 25% rate). Capital gain dividends will only be eligible for the rates describe above to the extent they are properly designated by the REIT as “capital gain dividends.” The maximum tax rate for non-corporate taxpayers for income that the REIT properly designates as “qualified dividend income” is generally 20%. However, dividends payable by REITs are not eligible for the 20% tax rate on qualified dividend income, except to the extent that certain holding requirements have been met and the REIT’s dividends are attributable to dividends received from taxable corporations (such as its taxable REIT subsidiaries) or to income that was subject to tax at the corporate/REIT level (for example, if the REIT distributed taxable income that it retained and paid tax on in the prior taxable year). In addition, United States holders that are corporations may be required to treat up to 20% of some capital gain dividends as ordinary income.

Medicare Tax on Unearned Income. Certain United States holders that are individuals, estates or trusts are required to pay an additional 3.8% tax on, among other things, dividends on and capital gains from the sale or other disposition of stock or debt obligations. United States holders should consult their tax advisors regarding the effect, if any, of these rules on their ownership and disposition of our capital stock or the operating partnership’s debt securities.

Withholding taxes may apply to certain types of payments made to “foreign financial institutions” (as defined in the Code) and certain other non-United States entities (including payments to United States holders who hold shares of our stock or the operating partnership’s debt securities through such a foreign financial institution or non-United States entity). Specifically, a 30% withholding tax may be imposed on dividends on, and gross proceeds from the sale or other disposition of, our capital stock or the operating partnership’s debt securities paid to a foreign financial institution or to a non-financial foreign entity, unless (1) the foreign financial institution undertakes certain diligence and reporting, (2) the non-financial foreign entity either certifies it does not have any substantial United States owners or furnishes identifying information regarding each substantial United States owner, or (3) the foreign financial institution or non-financial foreign entity otherwise qualifies for an exemption from these rules. If the payee is a foreign financial institution and is subject to the diligence and reporting requirements in clause (1) above, in order to avoid the imposition of such withholding, it generally must undertake to identify accounts held by certain United States persons or United States-owned foreign entities, annually report certain information about such accounts to the IRS (or, in some cases, local tax authorities), and withhold 30% on payments it makes to non-compliant foreign financial institutions and certain other account holders. Foreign financial institutions located in jurisdictions that have an intergovernmental agreement with the United States governing these withholding and reporting requirements may be subject to different rules.

The IRS has issued final Treasury regulations and additional guidance providing that the withholding provisions described above will generally apply to payments of dividends or interest made on or after July 1, 2014 and to payments of gross proceeds from a sale or other disposition of capital stock or debt securities on or after January 1, 2017. Because we may not know the extent to which a distribution is a dividend for United States federal income tax purposes at the time it is made, for purposes of these withholding rules we may treat the entire distribution as a dividend. In addition, these rules generally would not apply to debt securities issued before July 1, 2014, provided that if any such debt securities are significantly modified (within the meaning of applicable Treasury Regulations) on or after July 1, 2014, payments on such debt securities could be subject to the withholding rules described above. Prospective investors should consult their tax advisors regarding these withholding provisions.

State, local and foreign income tax laws may differ substantially from the corresponding United States federal income tax laws, and this discussion does not purport to describe any aspect of the tax laws of any state, local or foreign jurisdiction. You should consult your tax advisors regarding the effect of state, local and foreign tax laws with respect to our tax treatment as a REIT and on an investment in our capital stock or the operating partnership’s debt securities.

If the registration statement of which this prospectus forms a part is used by selling securityholders for the resale of any securities registered thereunder, information about such selling securityholders, their beneficial ownership of the securities and their relationship with us will be set forth in a prospectus supplement, in a post-effective amendment, or in filings we make with the SEC under the Exchange Act that are incorporated by reference to such registration statement.

We, or selling securityholders, may sell the offered securities on a delayed or continuous basis through agents, underwriters or dealers, directly to one or more purchasers, through a combination of any of these methods of sale, or in any other manner, as provided in the applicable prospectus supplement. As used herein, the term “selling securityholder” includes pledgees, donees, transferees or other successors-in-interest that receive the applicable offered securities from a selling securityholder as a gift, distribution or other transfer (including a purchase) after the date of this prospectus. We will identify the specific plan of distribution, including any underwriters, dealers, agents or direct purchasers and their compensation, in the applicable prospectus supplement.

Underwriters may offer and sell the securities at: (i) a fixed price or prices, which may be changed, (ii) market prices prevailing at the time of sale, (iii) prices related to the prevailing market prices at the time of sale or (iv) negotiated prices. We also may, from time to time, authorize broker-dealers acting as our agents to offer and sell the securities upon the terms and conditions as are set forth in the applicable prospectus supplement. In connection with the sale of securities, underwriters and agents may be deemed to have received compensation from us in the form of discounts or commissions and may also receive commissions from purchasers of securities. Underwriters and agents may sell securities to or through dealers, and the dealers may receive compensation in the form of discounts, concessions or commissions from the underwriters, agents and/or commissions from the purchasers.

Any discounts or commissions paid by us to underwriters, dealers or agents in connection with the offering of securities, and any discounts, concessions or commissions allowed by underwriters to participating dealers, will be set forth in the applicable prospectus supplement. Underwriters, dealers and agents may be entitled, under agreements entered into with us and our operating partnership, to indemnification against and contribution toward civil liabilities, including liabilities under the Securities Act. We will describe any indemnification agreement in the applicable prospectus supplement.

Unless we specify otherwise in the applicable prospectus supplement, any offered securities issued hereunder will be a new issue with no established trading market (other than our common stock, Series G preferred stock and Series H preferred stock, each of which is listed on the NYSE). If we sell any shares of our common stock, or additional shares of our Series G preferred stock or Series H preferred stock, pursuant to a prospectus supplement, such shares will be listed on the NYSE, subject to official notice of issuance. We may elect to list any other securities issued hereunder on any exchange, but we are not obligated to do so. Any underwriters or agents to or through whom such securities are sold by us or our operating partnership for public offering and sale may make a market in such securities, but such underwriters or agents will not be obligated to do so and may discontinue any market making at any time without notice. We cannot assure you as to the liquidity of the trading market for any such securities.

If indicated in the applicable prospectus supplement, we may authorize underwriters or other persons acting as our agents to solicit offers by institutions or other suitable purchasers to purchase the offered securities from us at the public offering price set forth in the applicable prospectus supplement, pursuant to delayed delivery contracts providing for payment and delivery on the date or dates stated in the prospectus supplement. These purchasers may include, among others, commercial and savings banks, insurance companies, pension funds, investment companies and educational and charitable institutions. Delayed delivery contracts will be subject to the condition that the purchase of the securities covered by the delayed delivery contracts will not at the time of delivery be prohibited under the laws of any jurisdiction in the United States to which the purchaser is subject. The underwriters and agents will not have any responsibility with respect to the validity or performance of these contracts.

In connection with the distributions of securities of selling securityholders, the selling securityholders, underwriters, selling group members and their respective affiliates may (i) enter into hedging transactions with

broker-dealers or other financial institutions, which may in turn engage in short sales of such securities in the course of hedging the positions they assume, (ii) sell our securities short and deliver the securities of the selling securityholders to close out such short positions, (iii) enter into option or other transactions with broker-dealers or other financial institutions which require the delivery to them of securities offered by the selling securityholder, which they may in turn resell or (iv) pledge securities to a broker-dealer or other financial institution, which, upon a default by the selling securityholder under the transaction to which such pledge relates, they may in turn resell.

In addition, the selling securityholders may sell securities pursuant to Rule 144 adopted under the Securities Act, as permitted by that rule, or under Section 4(1) of the Securities Act, rather than pursuant to an applicable prospectus supplement and this prospectus. In effecting sales, broker-dealers or agents engaged by us or the selling securityholders may arrange for other broker-dealers to participate. Broker-dealers or agents may receive commissions, discounts or concessions from the selling securityholders.

To facilitate the offering of any offered securities, certain persons participating in the offering may engage in transactions that stabilize, maintain, or otherwise affect the price of such offered securities. This may include over-allotments or short sales of such offered securities, which involves the sale by persons participating in the offering of more such offered securities than we or the selling securityholders, as applicable, sold to them. In these circumstances, these persons would cover the over-allotments or short positions by making purchases in the open market or by exercising any option to purchase additional securities that we or the selling securityholders, as applicable, may grant. In addition, these persons may stabilize or maintain the price of such offered securities by bidding for or purchasing securities in the open market or by imposing penalty bids, whereby selling concessions allowed to dealers participating in the offering may be reclaimed if offered securities sold by them are repurchased in connection with stabilization transactions. The effect of these transactions may be to stabilize or maintain the market price of such offered securities at a level above that which might otherwise prevail in the open market. These transactions may be discontinued at any time.

The underwriters, dealers and agents and their affiliates may be customers of, engage in transactions with and perform services for us and our operating partnership in the ordinary course of business.

Certain legal matters with respect to the validity of shares of the Company’s capital stock and certain other legal matters relating to Maryland law will be passed upon for us by Ballard Spahr LLP, Baltimore, Maryland. Certain legal matters will be passed upon for us by Latham & Watkins LLP, Los Angeles, California. Latham & Watkins LLP will rely as to certain matters of Maryland law on the opinion of Ballard Spahr LLP.

The financial statements, and the related financial statement schedules, incorporated in this prospectus by reference from Kilroy Realty Corporation’s and Kilroy Realty, L.P.’s Annual Report on Form 10-K for the year ended December 31, 2012, and the effectiveness of Kilroy Realty Corporation’s and Kilroy Realty, L.P.’s internal control over financial reporting have been audited by Deloitte & Touche LLP, an independent registered public accounting firm, as stated in their reports, which are incorporated herein by reference. Such financial statements and financial statement schedules have been so incorporated in reliance upon the reports of such firm given upon their authority as experts in accounting and auditing.

The Company files proxy statements and the Company and the operating partnership file annual, quarterly and current reports and other information with the SEC. You may read and copy any document we file with the SEC at the SEC’s public reference room at 100 F Street, N.E. Room 1580, Washington, D.C. 20549. Please call the SEC at 1-800-SEC-0330 for further information about the public reference room. The SEC also maintains a website that contains reports, proxy and information statements and other information regarding registrants that file electronically with the SEC at http://www.sec.gov. You can inspect reports and other information the Company and the operating partnership file at the offices of the NYSE, 20 Broad Street, New York, New York 10005.

We have filed with the SEC a Registration Statement on Form S-3, of which this prospectus is a part, including exhibits, schedules and amendments filed with, or incorporated by reference in, the Registration Statement, under the Securities Act with respect to the securities registered hereby. This prospectus and the applicable prospectus supplement do not contain all of the information set forth in the Registration Statement and exhibits and schedules to the Registration Statement. For further information with respect to us, the operating partnership and the securities registered hereby, reference is made to the Registration Statement, including the exhibits to the Registration Statement. Statements contained in this prospectus and the applicable prospectus supplement as to the contents of any contract or other document referred to in, or incorporated by reference in, this prospectus and the applicable prospectus supplement are not necessarily complete and, where that contract is an exhibit to the Registration Statement or an exhibit to a document incorporated by reference into the Registration Statement, each statement is qualified in all respects by the exhibit to which the reference relates. Copies of the Registration Statement, including the exhibits and schedules to the Registration Statement, may be examined at the SEC’s public reference room. Copies of all or a portion of the Registration Statement can be obtained from the public reference room of the SEC upon payment of prescribed fees. The Registration Statement is also available to you on the SEC’s website.

We are also incorporating by reference any additional documents that we file with the SEC pursuant to Sections 13(a), 13(c), 14 or 15(d) of the Exchange Act from the date of this prospectus until the termination of the offering described in this prospectus and the applicable prospectus supplement. We are not, however, incorporating by reference any documents or portions thereof or exhibits thereto, whether specifically listed above or filed in the future, that are deemed to have been “furnished to,” rather than “filed” with the SEC, including our compensation committee report and performance graph included or incorporated by reference in any Annual Report on Form 10-K or proxy statement, or any information or related exhibits furnished pursuant to Items 2.02 or 7.01 of Form 8-K, or any exhibits filed pursuant to Item 9.01 of Form 8-K that are not deemed “filed” with the SEC.

To receive a free copy of any of the documents incorporated by reference in this prospectus, including exhibits, if they are specifically incorporated by reference in the documents, call or write Kilroy Realty Corporation, 12200 West Olympic Boulevard, Suite 200, Los Angeles, California 90064, Attention: Secretary (telephone (310) 481-8400).



Title of Each Class of Securities to be Registered	Proposed Maximum Aggregate Offering Price	Amount of Registration Fee(1)
Kilroy Realty Corporation Common Stock, par value $0.01 per share	$300,000,000	$34,860


RBC Capital Markets		Jefferies		KeyBanc Capital Markets		BNP PARIBAS		J.P. Morgan		Barclays


	Page
Prospectus Supplement Summary		S-1
Risk Factors		S-4
Forward-Looking Statements		S-8
Use of Proceeds		S-10
Supplemental United States Federal Income Tax Considerations		S-11
Plan of Distribution (Conflicts of Interest)		S-12
Incorporation of Certain Documents by Reference		S-15
Legal Matters		S-16
Experts		S-16


RISK FACTORS			1
FORWARD-LOOKING STATEMENTS			1
CONSOLIDATED RATIO OF EARNINGS TO COMBINED FIXED CHARGES AND PREFERRED DIVIDENDS			3
THE COMPANY			4
USE OF PROCEEDS			5
DESCRIPTION OF DEBT SECURITIES AND RELATED GUARANTEES			5
DESCRIPTION OF CAPITAL STOCK			16
DESCRIPTION OF WARRANTS			31
DESCRIPTION OF DEPOSITARY SHARES			32
DESCRIPTION OF MATERIAL PROVISIONS OF THE PARTNERSHIP AGREEMENT OF KILROY REALTY, L.P.			33
CERTAIN PROVISIONS OF MARYLAND LAW AND OF THE COMPANY’S CHARTER AND BYLAWS			40
UNITED STATES FEDERAL INCOME TAX CONSIDERATIONS			47
SELLING SECURITYHOLDERS			71
PLAN OF DISTRIBUTION			72
LEGAL MATTERS			74
EXPERTS			75
WHERE YOU CAN FIND MORE INFORMATION			76
INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE			77


	For Six Months Ended June 30,			For Year Ended December 31,
	2013			2012			2011			2010			2009			2008
Consolidated ratio of earnings to fixed charges		0.98	x		0.88	x		0.87	x		0.85	x		1.07	x		1.12	x
Fixed Charges in Excess of Earnings (in thousands)	$	1,254		$	12,568		$	13,824		$	11,682			—			—
Consolidated ratio of earnings to combined fixed charges and preferred dividends		0.88	x		0.80	x		0.80	x		0.75	x		0.93	x		0.98	x
Deficiency (in thousands)	$	7,880		$	23,135		$	23,432		$	21,290		$	5,243		$	1,478