10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-K

(Mark one)

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

For the fiscal year ended December 31, 2015

or

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

For the transition period from to

Commission file number 1-14023 (Corporate Office Properties Trust)

Commission file number 333-189188 (Corporate Office Properties, L.P.)

Corporate Office Properties Trust

Corporate Office Properties, L.P.

(Exact name of registrant as specified in its charter)

Corporate Office Properties Trust	Maryland	23-2947217
	(State or other jurisdiction of	(IRS Employer
	incorporation or organization)	Identification No.)
Corporate Office Properties, L.P.	Delaware	23-2930022
	(State or other jurisdiction of	(IRS Employer
	incorporation or organization)	Identification No.)

6711 Columbia Gateway Drive, Suite 300, Columbia, MD	21046
(Address of principal executive offices)	(Zip Code)

 Registrant’s telephone number, including area code:  (443) 285-5400

________________________________________

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

(Title of Each Class)	(Name of Exchange on Which Registered
Common Shares of beneficial interest, $0.01 par value	New York Stock Exchange
Series L Cumulative Redeemable Preferred Shares of beneficial interest, $0.01 par value	New York Stock Exchange

Securities registered pursuant to Section 12(g) of the Act: None

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

Corporate Office Properties Trust ý Yes   o No

Corporate Office Properties, L.P. ý Yes   o No

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

Corporate Office Properties Trust o Yes   ý No

Corporate Office Properties, L.P. o Yes   ý No

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

Corporate Office Properties Trust ý Yes   o No

Corporate Office Properties, L.P. ý Yes   o No

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

Corporate Office Properties Trust ý Yes   o No

Corporate Office Properties, L.P. ý Yes   o No

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

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

Corporate Office Properties Trust

Large accelerated filer x	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
		(Do not check if a smaller reporting company)

Corporate Office Properties, L.P.

Large accelerated filer o	Accelerated filer o	Non-accelerated filer x	Smaller reporting company o
		(Do not check if a smaller reporting company)

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

Corporate Office Properties Trust o Yes   ý No

Corporate Office Properties, L.P. o Yes   ý No

The aggregate market value of the voting and nonvoting shares of common stock held by non-affiliates of Corporate Office Properties Trust was approximately $2.2 billion, as calculated using the closing price of such shares on the New York Stock Exchange and the number of outstanding shares as of June 30, 2015. For purposes of calculating this amount only, affiliates are defined as Trustees, executive owners and beneficial owners of more than 10% of Corporate Office Properties Trust’s outstanding common shares, $0.01 par value. At February 16, 2016, 94,528,118 of Corporate Office Properties Trust’s common shares were outstanding.

The aggregate market value of the voting and nonvoting common units of limited partnership interest held by non-affiliates of Corporate Office Properties, L.P. was approximately $79.4 million, as calculated using the closing price of the common shares of Corporate Office Properties Trust (into which common units not held by Corporate Office Properties Trust are exchangeable) on the New York Stock Exchange and the number of outstanding units as of June 30, 2015.

Portions of the proxy statement of Corporate Office Properties Trust for its 2016 Annual Meeting of Shareholders to be filed within 120 days after the end of the fiscal year covered by this Form 10-K are incorporated by reference into Part III of this Form 10-K.

EXPLANATORY NOTE

This report combines the annual reports on Form 10-K for the year ended December 31, 2015 of Corporate Office Properties Trust (“COPT”) and subsidiaries (collectively, the “Company”) and Corporate Office Properties, L.P. (“COPLP”) and subsidiaries (collectively, the “Operating Partnership”). Unless stated otherwise or the context otherwise requires, “we,” “our,” and “us” refer collectively to COPT, COPLP and their subsidiaries.

COPT is a real estate investment trust, or REIT, and the sole general partner of COPLP. As of December 31, 2015, COPT owned approximately 96.3% of the outstanding common units and approximately 95.5% of the outstanding preferred units in COPLP. The remaining common and preferred units in COPLP were owned by third parties. As the sole general partner of COPLP, COPT controls COPLP and can cause it to enter into major transactions including acquisitions, dispositions and refinancings and cause changes in its line of business, capital structure and distribution policies.

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

Noncontrolling interests and shareholders’ equity and partners’ capital are the main areas of difference between the consolidated financial statements of COPT and those of COPLP. The common limited partnership interests in COPLP not owned by COPT are accounted for as partners’ capital in COPLP’s consolidated financial statements and as noncontrolling interests in COPT’s consolidated financial statements. COPLP’s consolidated financial statements also reflect COPT’s noncontrolling interests in certain real estate partnerships, limited liability companies (“LLCs”), business trusts and corporations; the differences between shareholders’ equity, partners’ capital and noncontrolling interests result from the differences in the equity issued at the COPT and COPLP levels and in COPT’s noncontrolling interests in these real estate partnerships, LLCs, business trusts and corporations. The only other significant differences between the consolidated financial statements of COPT and those of COPLP are assets in connection with a non-qualified elective deferred compensation plan (comprised primarily of mutual funds and equity securities) and the corresponding liability to the plan’s participants that are held directly by COPT.

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

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

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

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

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

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

• consolidated financial statements;

• the following notes to the consolidated financial statements:

• Note 3, Fair Value Measurements of COPT and subsidiaries and COPLP and subsidiaries;

• Note 13, Equity of COPT and subsidiaries;

• Note 14, Equity of COPLP and subsidiaries;

• Note 19, Earnings per Share of COPT and subsidiaries and Earnings per Unit of COPLP and subsidiaries; and

• Note 22, Quarterly Data of COPT and subsidiaries and COPLP and subsidiaries.

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

• “Item 7: Management’s Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources of COPLP.”

This report also includes separate sections under Part II, Item 9A. Controls and Procedures and separate Exhibit 31 and Exhibit 32 certifications for each of COPT and COPLP to establish that the Chief Executive Officer and the Chief Financial Officer of each entity have made the requisite certifications and that COPT and COPLP are compliant with Rule 13a-15 and Rule 15d-14 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and 18 U.S.C. §1350.

Table of Contents

Form 10-K

		PAGE
PART I
ITEM 1.	BUSINESS	6
ITEM 1A	RISK FACTORS	10
ITEM 1B.	UNRESOLVED STAFF COMMENTS	17
ITEM 2.	PROPERTIES	18
ITEM 3.	LEGAL PROCEEDINGS	22
ITEM 4.	MINE SAFETY DISCLOSURES	22
PART II
ITEM 5.	MARKET FOR REGISTRANTS’ COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES	22
ITEM 6.	SELECTED FINANCIAL DATA	24
ITEM 7.	MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	28
ITEM 7A.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	55
ITEM 8.	FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA	56
ITEM 9.	CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE	56
ITEM 9A.	CONTROLS AND PROCEDURES	56
ITEM 9B	OTHER INFORMATION	57
PART III
ITEM 10.	DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE	57
ITEM 11.	EXECUTIVE COMPENSATION	57
ITEM 12.	SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS	57
ITEM 13.	CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE	57
ITEM 14.	PRINCIPAL ACCOUNTANT FEES AND SERVICES	57
PART IV
ITEM 15.	EXHIBITS AND FINANCIAL STATEMENT SCHEDULES	58
	SIGNATURES	64

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FORWARD-LOOKING STATEMENTS

This Form 10-K contains “forward-looking” statements, as defined in the Private Securities Litigation Act of 1995, that are based on our current expectations, estimates and projections about future events and financial trends affecting the financial condition and operations of our business. Additionally, documents we subsequently file with the SEC and incorporated by reference will contain forward-looking statements.

Forward-looking statements can be identified by the use of words such as “may,” “will,” “should,” “could,” “believe,” “anticipate,” “expect,” “estimate,” “plan” or other comparable terminology. Forward-looking statements are inherently subject to risks and uncertainties, many of which we cannot predict with accuracy and some of which we might not even anticipate. Although we believe that the expectations, estimates and projections reflected in such forward-looking statements are based on reasonable assumptions at the time made, we can give no assurance that these expectations, estimates and projections will be achieved. Future events and actual results may differ materially from those discussed in the forward-looking statements. We caution readers that forward-looking statements reflect our opinion only as of the date on which they were made. You should not place undue reliance on forward-looking statements. The following factors, among others, could cause actual results and future events to differ materially from those set forth or contemplated in the forward-looking statements:

• general economic and business conditions, which will, among other things, affect office property and data center demand and rents, tenant creditworthiness, interest rates, financing availability and property values;

• adverse changes in the real estate markets, including, among other things, increased competition with other companies;

• governmental actions and initiatives, including risks associated with the impact of a prolonged government shutdown or budgetary reductions or impasses, such as a reduction in rental revenues, non-renewal of leases and/or a curtailment of demand for additional space by our strategic customers;

• our ability to borrow on favorable terms;

• risks of real estate acquisition and development activities, including, among other things, risks that development projects may not be completed on schedule, that tenants may not take occupancy or pay rent or that development or operating costs may be greater than anticipated;

• risks of investing through joint venture structures, including risks that our joint venture partners may not fulfill their financial obligations as investors or may take actions that are inconsistent with our objectives;

• changes in our plans for properties or views of market economic conditions or failure to obtain development rights, either of which could result in recognition of significant impairment losses;

• our ability to satisfy and operate effectively under Federal income tax rules relating to real estate investment trusts and partnerships;

• the dilutive effects of issuing additional common shares;

• our ability to achieve projected results; and

• environmental requirements.

We undertake no obligation to publicly update or supplement forward-looking statements, whether as a result of new information, future events or otherwise. For further information on these and other factors that could affect us and the statements contained herein, you should refer to the section below entitled “Item 1A. Risk Factors.”

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PART I

Item 1. Business

OUR COMPANY

General. Corporate Office Properties Trust (“COPT”) and subsidiaries (collectively, the “Company”) is a fully-integrated and self-managed real estate investment trust (“REIT”). Corporate Office Properties, L.P. (“COPLP”) and subsidiaries (collectively, the “Operating Partnership”) is the entity through which COPT, the sole general partner of COPLP, conducts almost all of its operations and owns almost all of its assets. Unless otherwise expressly stated or the context otherwise requires, “we”, “us” and “our” as used herein refer to each of the Company and the Operating Partnership. We own, manage, lease, develop and selectively acquire office and data center properties. The majority of our portfolio is in locations that support United States Government agencies and their contractors, most of whom are engaged in national security, defense and information technology (“IT”) related activities servicing what we believe are growing, durable priority missions (“Defense/IT Locations”). We also own a complementary portfolio of traditional office properties located in select urban/urban-like submarkets within our regional footprint with durable Class-A office fundamentals and characteristics, as well as other properties supporting general commercial office tenants (“Regional Office”). As of December 31, 2015, our properties included the following:

• 177 operating office properties totaling 18.1 million square feet that were 92% occupied, including nine triple-net leased, single-tenant data center properties;

• 13 office properties under, or contractually committed for, construction or redevelopment that we estimate will total approximately 1.5 million square feet upon completion, including one partially operational property included above;

• 1,439 acres of land we control that we believe are potentially developable into approximately 17.6 million square feet; and

• a wholesale data center with a critical load of 19.25 megawatts.

COPLP owns real estate both directly and through subsidiary partnerships and limited liability companies (“LLCs”).  In addition to owning real estate, COPLP also owns subsidiaries that provide real estate services such as property management and construction and development services primarily for our properties but also for third parties. Some of these services are performed by a taxable REIT subsidiary (“TRS”).

Equity interests in COPLP are in the form of common and preferred units. As of December 31, 2015, COPT owned 96.3% of the outstanding COPLP common units (“common units”) and 95.5% of the outstanding COPLP preferred units (“preferred units”); the remaining common and preferred units in COPLP were owned by third parties. Common units in COPLP not owned by COPT carry certain redemption rights. The number of common units in COPLP owned by COPT is equivalent to the number of outstanding common shares of beneficial interest (“common shares”) of COPT, and the entitlement of all COPLP common units to quarterly distributions and payments in liquidation is substantially the same as those of COPT common shareholders. Similarly, in the case of each series of preferred units in COPLP held by COPT, there is a series of preferred shares of beneficial interest (“preferred shares”) in COPT that is equivalent in number and carries substantially the same terms as such series of COPLP preferred units. COPT’s common shares are publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “OFC”.

Because COPLP is managed by COPT, and COPT conducts substantially all of its operations through COPLP, we refer to COPT’s executive officers as COPLP’s executive officers, and although, as a partnership, COPLP does not have a board of trustees, we refer to COPT’s Board of Trustees as COPLP’s Board of Trustees.

We believe that COPT is organized and has operated in a manner that satisfies the requirements for taxation as a REIT under the Internal Revenue Code of 1986, as amended, and we intend to continue to operate COPT in such a manner. If COPT continues to qualify for taxation as a REIT, it generally will not be subject to Federal income tax on its taxable income (other than that of its TRS) that is distributed to its shareholders. A REIT is subject to a number of organizational and operational requirements, including a requirement that it distribute to its shareholders at least 90% of its annual taxable income.

Our executive offices are located at 6711 Columbia Gateway Drive, Suite 300, Columbia, Maryland 21046 and our telephone number is (443) 285-5400.

Our Internet address is www.copt.com. We make available on our Internet website free of charge our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and amendments to those reports filed or furnished pursuant to Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), as soon as reasonably possible after we file such material with the Securities and Exchange Commission (the “SEC”). In addition, we have made available on our Internet website under the heading “Corporate Governance” the charters for our Board of Trustees’ Audit, Nominating and Corporate Governance, Compensation and Investment Committees, as well as our Corporate

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Governance Guidelines, Code of Business Conduct and Ethics and Code of Ethics for Financial Officers. We intend to make available on our website any future amendments or waivers to our Code of Business Conduct and Ethics and Code of Ethics for Financial Officers within four business days after any such amendments or waivers. The information on our Internet site is not part of this report.

The SEC maintains an Internet website that contains reports, proxy and information statements and other information regarding issuers that file electronically with the SEC. This Internet website can be accessed at www.sec.gov. The public may also read and copy paper filings that we have made with the SEC at the SEC’s Public Reference Room, located at 100 F Street, NE, Washington, DC 20549. Information on the operation of the Public Reference Room may be obtained by calling (800) SEC-0330.

Significant Developments

In 2015, we:

• finished the period with occupancy of our portfolio of operating office properties of 91.6%;

• leased 11.25 megawatts in our wholesale data center. The center became 100% operational during the period and was 92.5% leased as of year end;

• placed into service an aggregate of 1.1 million square feet in seven newly constructed properties and two redeveloped properties that were 97.1% leased as of December 31, 2015;

• acquired:

◦ 250 W. Pratt Street, a 367,000 square foot property in Baltimore, Maryland that was 96.2% leased, for $61.8 million on March 19, 2015;

◦ 2600 Park Tower Drive, a 237,000 square foot property in Northern Virginia that was 100% leased, for $80.5 million on April 15, 2015; and

◦ 100 Light Street, a 558,000 square foot office property in Baltimore, Maryland that was 93.5% leased, and its structured parking garage, 30 Light Street, for $121.2 million on August 7, 2015. In connection with that acquisition, we assumed a $55.0 million mortgage loan;

• disposed of nine office properties totaling 1.6 million square feet and land for transaction values totaling $365.9 million, including:

◦ seven office properties (five in Baltimore County, Maryland and two in Northern Virginia) and land sold for $198.5 million; and

◦ two office properties in Northern Virgina totaling 665,000 square feet that secured a $150.0 million nonrecourse mortgage loan. On August 28, 2015, ownership in these properties was transferred to the mortgage lender and we removed the debt obligation and accrued interest from our balance sheet;

• issued $300.0 million of 5.00% Senior Notes on June 29, 2015 at an initial offering price of 99.51% of their face value. The proceeds from the issuance, after deducting underwriting discounts but before other offering expenses, were approximately $296.6 million;

• entered into an unsecured term loan agreement on December 17, 2015 with an initial commitment of $250.0 million of which we borrowed $100.0 million; and

• issued 890,241 COPT common shares at a weighted average price of $30.29 per share under our at-the-market stock offering program established in October 2012. Net proceeds from the shares issued totaled $26.6 million. The net proceeds were contributed to COPLP in exchange for 890,241 common units.

On February 10, 2016, our Board of Trustees appointed Stephen E. Budorick, our Executive Vice President and Chief Operating Officer since September 2011, to become our President and Chief Executive Officer effective May 12, 2016, the date of the Company’s 2016 Annual Meeting of Shareholders. On that date, Roger A. Waesche, Jr., our current President and Chief Executive Officer, will leave the Company to pursue other interests and he will not be nominated for reelection as a Trustee. The Board expects to appoint Mr. Budorick to our Board of Trustees after the 2016 Annual Meeting of Shareholders.

Business and Growth Strategies

Our primary goal is to deliver attractive and competitive total returns to our shareholders. This section sets forth key components of our business and growth strategies that we have in place to support this goal.

Defense/ IT Locations Strategy: We specialize in serving the unique requirements of tenants of our Defense/IT Locations. The majority of our properties are located adjacent to, or houses, United States Government agencies. Our customers in these properties are primarily United States Government agencies and their contractors engaged in activities servicing what we believe are high priority security, defense and IT missions. These tenants’ missions generally pertain to knowledge-based

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activities (such as cyber security, research and development and other highly technical defense and security areas) rather than to force structure (troops) and weapon system production. A high percentage of our revenue (80.8% as of December 31, 2015) is concentrated in Defense/IT Locations, and we expect to maintain a high concentration through our:

• properties’ (existing buildings and developable land we control) proximity to defense installations and other knowledge-based government demand drivers, and our willingness to expand to new locations with similar proximities;

• extensive experience in developing secured, specialized space, with the ability to satisfy the United States Government’s unique needs, including Sensitive Compartmented Information Facility (“SCIF”) and Anti-Terrorism Force Protection (“ATFP”) requirements;

• depth of knowledge, specialized skills and credentialed personnel in operating highly specialized space with security-oriented needs;

• well-established relationships with United States Government agencies and their contractors; and

• track record of providing service that exceeds customer expectations both in terms of the quality of the space we provide and our level of responsiveness to their needs. We believe that operating with such an emphasis on service enables us to be a landlord of choice with high quality tenants of these properties and contributes to high levels of customer loyalty and retention.

Regional Office Strategy: While our primary focus pertains to Defense/IT Locations, we also own a portfolio of traditional office properties located in select urban/urban-like submarkets within our regional footprint with durable Class-A office fundamentals and characteristics, as well as other properties supporting general commercial office tenants. We believe that our Regional Office portfolio enables us to leverage our local expertise in a region into a second growth platform in a way that is complementary to our Defense/IT Locations strategy. Characteristics that we seek in Regional Office submarkets include: (1) mixed-use, lifestyle oriented locations with a robust high-end residential and retail base; (2) proximity to public transportation and major transportation routes; (3) educated workforce; and (4) diverse and growing employment base. We believe that these types of submarkets provide better overall quality and opportunity for long-term, sustained growth than other commercial office submarkets.

Asset Management Strategy: We aggressively manage our portfolio to maximize the value and operating performance of each property through: (1) proactive property management and leasing; (2) achievement of operating efficiencies by increasing economies of scale and, where possible, aggregating vendor contracts to achieve volume pricing discounts; (3) renewing tenant leases and re-tenanting at increased rents where market conditions permit; and (4) redevelopment when we believe property conditions and market demand warrant. We may also seek to dispose of properties when they no longer meet our strategic objectives, or when capital markets and the circumstances pertaining to such holdings otherwise warrant, in order to maximize our return on invested capital and be better positioned for long-term growth.

We also aim to develop and operate our properties in a manner that minimizes adverse impact on the environment by: (1) constructing new buildings designed to use resources with a high level of efficiency and low impact on human health and the environment during their life cycles through our participation in the U.S. Green Building Council’s Leadership in Energy and Environmental Design (“LEED”) program; (2) investing in energy systems and other equipment that reduce energy consumption and property operating costs; and (3) adopting select LEED Existing Building (“EB”) prerequisites for much of our portfolio, including guidelines pertaining to cleaning and recycling practices and energy reduction. In 2015, we participated for the first time in the GRESB (or Global Real Estate Sustainability Benchmark) survey, which is widely recognized for measuring the sustainability performance of real estate companies and funds, and earned an overall score of “Green Star,” which represents the highest quadrant of achievement from the survey.

Property Development and Acquisition Strategy: We pursue property development and acquisition opportunities for properties that fit our Defense/IT Locations and Regional Office strategies and, as discussed above, have significant land holdings that we believe can help fuel future development of Defense/IT Locations in particular. We pursue development activities as market conditions and leasing opportunities support favorable risk-adjusted returns on investment, and therefore typically prefer properties to be significantly leased prior to commencing construction. We typically seek to make acquisitions at attractive yields and below replacement cost, or that otherwise meet our strategic objectives. We also seek to increase operating cash flow of certain acquisitions by repositioning the properties and capitalizing on existing below market leases and expansion opportunities.

Capital Strategy: Our capital strategy is aimed at maintaining access to capital in the face of differing market conditions in the most cost-effective manner by:

• maintaining an investment grade rating to enable us to use debt comprised of unsecured, primarily fixed-rate debt (including the effect of interest rate swaps) from public markets and banks;

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• using secured nonrecourse debt from institutional lenders and banks;

• managing our debt by monitoring, among other things: (1) our total and secured debt levels relative to our overall capital structure; (2) the relationship of certain measures of earnings to our debt level and to certain capital costs; (3) the timing of debt maturities to ensure that maturities in any year do not exceed levels that we believe we can refinance; and (4) the relationship of our variable-rate debt to our total debt;

• using equity raised through issuances of common and preferred shares, issuances of common and preferred units in COPLP and, to a lesser extent, joint venture structures for certain investments;

• paying dividends at a level that at least enables us to maintain our REIT status;

• recycling proceeds from property sales under our asset management strategy (discussed above) to fund our investment activities and to reduce overall debt; and

• continuously evaluating the ability of our capital resources to accommodate our plans for future growth.

Industry Segments

We operate in two primary industries: commercial office properties and our wholesale data center. Effective in the quarter ended December 31, 2015, we changed the reportable segments that we use to review operating results and make decisions regarding segment performance and resource allocation. Given the changes in our portfolio resulting from development, acquisition and disposition activities, we made this change to better align our segments with our business strategy by contemplating the market characteristics of our properties. As of December 31, 2015, our commercial office real estate operations included the following: Defense/IT Locations and Regional Office. Our segment reporting also included reporting for Defense/IT Locations sub-segments, which included the following:

• Fort George G. Meade and the Baltimore/Washington Corridor (referred to herein as “Fort Meade/BW Corridor”);

• Northern Virginia Defense I/T Locations;

• Lackland Air Force Base in San Antonio, Texas;

• locations serving the U.S. Navy (referred to herein as “Navy Support Locations”). Properties in this segment as of December 31, 2015 were proximate to the Washington Navy Yard, the Naval Air Station Patuxent River in Maryland and the Naval Surface Warfare Center Dahlgren Division in Virginia;

• Redstone Arsenal in Huntsville, Alabama; and

• data center shells, which are properties leased to tenants to be operated as data centers in which the tenants generally fund the costs for the power, fiber connectivity and data center infrastructure. Most of our data center shells as of December 31, 2015 were proximate to the MAE-East Corridor, a major center in the United States for interconnecting traffic between Internet service providers.

As of December 31, 2015, Defense/IT Locations comprised 146 of our office properties, or 79.6% of our square feet in operations, while Regional Office comprised 24 of our office properties, or 17.7% of our square feet in operations. Our wholesale data center, which is comprised of one property in Manassas, Virginia, is reported as a separate segment.

For information relating to our segments, you should refer to Note 17 to our consolidated financial statements, which is included in a separate section at the end of this Annual Report on Form 10-K beginning on page F-1.

Employees

As of December 31, 2015, we had 383 employees, none of whom were parties to collective bargaining agreements. We believe that our relations with our employees are good.

Competition

The commercial real estate market is highly competitive. Numerous commercial properties compete with us for tenants. Some of the properties competing with ours may be newer or in more desirable locations, or the competing properties’ owners may be willing to accept lower rents than we are. We also compete with our own tenants, many of whom have the right to sublease their space. The competitive environment for leasing is affected considerably by a number of factors including, among other things, changes in economic conditions and supply of and demand for space. These factors may make it difficult for us to lease existing vacant space and space associated with future lease expirations at rental rates that are sufficient to meeting our short-term capital needs.

We compete for the acquisition of commercial properties with many entities, including other publicly-traded commercial REITs. Competitors for such acquisitions may have substantially greater financial resources than ours. In addition, our competitors may be willing to accept lower returns on their investments or may be willing to incur higher leverage. If our

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competitors prevent us from buying properties that we have targeted for acquisition, we may not be able to meet our property acquisition goals.

We also compete with many entities, including other publicly-traded commercial REITs, for capital. This competition could adversely affect our ability to raise capital we may need to fulfill our capital strategy.

Item 1A. Risk Factors

Set forth below are risks and uncertainties relating to our business and the ownership of our securities. These risks and uncertainties may lead to outcomes that could adversely affect our financial position, results of operations, cash flows and ability to make expected distributions to our equityholders. You should carefully consider each of these risks and uncertainties and all of the information in this Annual Report on Form 10-K and its Exhibits, including our consolidated financial statements and notes thereto for the year ended December 31, 2015, which are included in a separate section at the end of this report beginning on page F-1.

Our performance and value are subject to risks associated with our properties and with the real estate industry. Real estate investments are subject to various risks and fluctuations in value and demand, many of which are beyond our control.  Our economic performance and the value of our real estate assets may decline due to conditions in the general economy and the real estate business which, in turn, could have an adverse effect on our financial position, results of operations, cash flows and ability to make expected distributions to our shareholders. These conditions include, but are not limited to:

• downturns in national, regional and local economic environments, including increases in the unemployment rate and inflation or deflation;

• competition from other properties;

• deteriorating local real estate market conditions, such as oversupply, reduction in demand and decreasing rental rates;

• unavailability of financing for potential purchasers of our properties;

• declining real estate valuations;

• increasing vacancies and the need to periodically repair, renovate and re-lease space;

• adverse developments concerning our tenants, which could affect our ability to collect rents and execute lease renewals;

• government actions and initiatives, including risks associated with the impact of prolonged government shutdowns and budgetary reductions or impasses, such as a reduction of rental revenues, non-renewal of leases and/or a curtailment of demand for additional space by our strategic customers;

• increasing operating costs, including insurance expenses, utilities, real estate taxes and other expenses, much of which we may not be able to pass through to tenants;

• increasing interest rates and unavailability of financing on acceptable terms or at all;

• trends in office real estate that may adversely affect future demand, including telecommuting and flexible workplaces that increase the population density per square foot;

• adverse changes in taxation or zoning laws;

• potential inability to secure adequate insurance;

• adverse consequences resulting from civil disturbances, natural disasters, terrorist acts or acts of war; and

• potential liability under environmental or other laws or regulations.

We may suffer adverse consequences as a result of adverse economic conditions. Our business may be affected by adverse economic conditions in the United States economy or real estate industry as a whole or by the local economic conditions in the markets in which our properties are located, including the impact of high unemployment and constrained credit. Adverse economic conditions could increase the likelihood of tenants encountering financial difficulties, including bankruptcy, insolvency or general downturn of business, and as a result could increase the likelihood of tenants defaulting on their lease obligations to us. Such conditions also could increase the likelihood of our being unsuccessful in renewing tenants, renewing tenants on terms less favorable to us or being unable to lease newly constructed properties. In addition, such conditions could increase the level of risk that we may not be able to obtain new financing for development activities, acquisitions, refinancing of existing debt or other capital requirements at reasonable terms, if at all.

We may suffer adverse consequences as a result of our reliance on rental revenues for our income. We earn revenue from renting our properties. Our operating costs do not necessarily fluctuate in relation to changes in our rental revenue. This means that our costs will not necessarily decline and may increase even if our revenues decline.

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For new tenants or upon lease expiration for existing tenants, we generally must make improvements and pay other leasing costs for which we may not receive increased rents. We also make building-related capital improvements for which tenants may not reimburse us.

If our properties do not generate revenue sufficient to meet our operating expenses and capital costs, we may have to borrow additional amounts to cover these costs. In such circumstances, we would likely have lower profits or possibly incur losses. We may also find in such circumstances that we are unable to borrow to cover such costs, in which case our operations could be adversely affected.

In addition, the competitive environment for leasing is affected considerably by a number of factors including, among other things, changes due to economic factors such as supply and demand. These factors may make it difficult for us to lease existing vacant space and space associated with future lease expirations at rental rates that are sufficient to meet our short-term capital needs.

We rely on the ability of our tenants to pay rent and would be harmed by their inability to do so. Our performance depends on the ability of our tenants to fulfill their lease obligations by paying their rental payments in a timely manner. As a result, we would be harmed if one or more of our major tenants, or a number of our smaller tenants, were to experience financial difficulties, including bankruptcy, insolvency, government shutdown, or general downturn of business.

We may be adversely affected by developments concerning some of our major tenants and sector concentrations, including prolonged shutdowns of the United States Government and actual, or potential, reductions in government spending targeting United States Government agencies and defense contractors engaged in knowledge-based activities. As of December 31, 2015, our 20 largest tenants accounted for 63.8% of the total annualized rental revenue of our office properties, and the four largest of these tenants accounted for 41.9%. We calculated the annualized rental revenue by multiplying by 12 the sum of monthly contractual base rents and estimated monthly expense reimbursements under active leases in our portfolio of office properties as of December 31, 2015. Information regarding our four largest tenants is set forth below:

Tenant	Annualized Rental Revenue as of December 31, 2015		Percentage of Total Annualized Rental Revenue of Office Properties	Number of Leases
	(in thousands)
United States of America	$	141,497	29.0%	63
Northrop Grumman Corporation (1)	22,403		4.6%	9
The Boeing Company (1)	21,842		4.5%	12
General Dynamics Corporation (1)	19,163		3.9%	7

(1) Includes affiliated organizations and agencies and predecessor companies.

Most of our leases with the United States Government provide for a series of one-year terms or provide for early termination rights. The United States Government may terminate its leases if, among other reasons, the United States Congress fails to provide funding. We would be harmed if any of our four largest tenants fail to make rental payments to us, including as a result of a prolonged government shutdown, or if the United States Government elects to terminate some or all of its leases and the space cannot be re-leased on satisfactory terms.

As of December 31, 2015, 80.8% of the total annualized rental revenue of our office properties was from Defense/IT Locations, and we expect to maintain a similarly high revenue concentration in these types of properties. A reduction in government spending targeting the activities of these agencies and contractors (such as knowledge-based defense and security activities) could affect the ability of these tenants to fulfill lease obligations, decrease the likelihood that these tenants will renew their leases or enter into new leases and limit our future growth from these sectors. Moreover, uncertainty regarding the potential for future reduction in government spending targeting such activities could also decrease or delay leasing activity from tenants engaged in these activities.

Most of our properties are geographically concentrated in the Mid-Atlantic region, particularly in the Greater Washington, DC/Baltimore region, or in particular office parks. We may suffer economic harm in the event of a decline in the real estate market or general economic conditions in those regions or parks. Most of our properties are located in the Mid-Atlantic region of the United States, particularly in the Greater Washington, DC/Baltimore region. Our properties are also often concentrated in office parks in which we own most of the properties. Consequently, our portfolio of properties is not

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broadly distributed geographically. As a result, we would be harmed by a decline in the real estate market or general economic conditions in the Mid-Atlantic region, the Greater Washington, DC/Baltimore region or the office parks in which our properties are located.

We would suffer economic harm if we were unable to renew our leases on favorable terms. When leases expire, our tenants may not renew or may renew on terms less favorable to us than the terms of their original leases. If a tenant vacates a property, we can expect to experience a vacancy for some period of time, as well as incur higher leasing costs than we would likely incur if a tenant renews. As a result, we may be harmed if we experience a high volume of tenant departures at the end of their lease terms.

We may be adversely affected by trends in the office real estate industry. Some businesses increasingly permit employee telecommuting, flexible work schedules, open workplaces and teleconferencing. These practices enable businesses to reduce their space requirements. These trends could over time erode the overall demand for office space and, in turn, place downward pressure on occupancy, rental rates and property valuations.

We may encounter a decline in the value of our real estate. The value of our real estate could be adversely affected by general economic and market conditions connected to a specific property, a market or submarket, a broader economic region or the office real estate industry. Examples of such conditions include a broader economic recession, declining demand and decreases in market rental rates and/or market values of real estate assets. If our real estate assets decline in value, it could result in our recognition of impairment losses. Moreover, a decline in the value of our real estate could adversely affect the amount of borrowings available to us under future credit facilities and other loans.

We may not be able to compete successfully with other entities that operate in our industry. The commercial real estate market is highly competitive. We compete for the purchase of commercial property with many entities, including other publicly traded commercial REITs. Many of our competitors have substantially greater financial resources than we do. If our competitors prevent us from buying properties that we target for acquisition, we may not be able to meet our property acquisition goals. Moreover, numerous commercial properties compete with our properties for tenants. Some of the properties competing with ours may be newer or in more desirable locations, or the competing properties’ owners may be willing to accept lower rates than are acceptable to us.

Real estate investments are illiquid, and we may not be able to dispose of properties on a timely basis when we determine it is appropriate to do so. We intend to sell properties to fund our development plans and reduce debt. Real estate investments can be difficult to sell and convert to cash quickly, especially if market conditions, including real estate lending conditions, are not favorable. Such illiquidity could limit our ability to quickly change our portfolio of properties in response to changes in economic or other conditions. Our failure to successfully execute dispositions could adversely affect our ability to effectively execute our business strategy. Moreover, under certain circumstances, the Internal Revenue Code imposes certain penalties on a REIT that sells property held for less than two years and limits the number of properties it can sell in a given year. In addition, for certain of our properties that we acquired by issuing units in COPLP, we are restricted by agreements with the sellers of the properties for a certain period of time from entering into transactions (such as the sale or refinancing of the acquired property) that will result in a taxable gain to the sellers without the seller’s consent.

We are dependent on external sources of capital for future growth. Because COPT is a REIT, it must distribute at least 90% of its annual taxable income to its shareholders. Due to this requirement, we are not able to significantly fund our acquisition, construction and development activities using retained cash flow from operations. Therefore, our ability to fund these activities is dependent on our ability to access debt or equity capital. Such capital could be in the form of new debt, common shares, preferred shares, common and preferred units in COPLP or joint venture funding. These capital sources may not be available on favorable terms or at all. Moreover, additional debt financing may substantially increase our leverage and subject us to covenants that restrict management’s flexibility in directing our operations, and additional equity offerings may result in substantial dilution of our equityholders’ interests. Our inability to obtain capital when needed could have a material adverse effect on our ability to expand our business and fund other cash requirements.

We often use our Revolving Credit Facility to initially finance much of our investing activities and certain financing activities. We also use other credit facilities to fund a significant portion of our construction activities. Our lenders under these and other facilities could, for financial hardship or other reasons, fail to honor their commitments to fund our requests for borrowings under these facilities. If lenders default under these facilities by not being able or willing to fund a borrowing request, it would adversely affect our ability to access borrowing capacity under these facilities.

We may be unable to successfully execute plans to acquire existing commercial real estate properties.We may acquire existing commercial real estate properties to the extent that suitable acquisitions can be made on advantageous terms.

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Acquisitions of commercial properties entail risks, such as the risks that we may not be in a position, or have the opportunity in the future, to make suitable property acquisitions on advantageous terms and/or that such acquisitions will fail to perform as expected.

We may be exposed to unknown liabilities from acquired properties. We may acquire properties that are subject to liabilities in situations where we have no recourse, or only limited recourse, against the prior owners or other third parties with respect to unknown liabilities. As a result, if a liability were asserted against us based upon ownership of those properties, we might have to pay substantial sums to settle or contest it, which could adversely affect our results of operations and cash flow. Examples of unknown liabilities with respect to acquired properties include, but are not limited to:

• liabilities for clean-up of disclosed or undisclosed environmental contamination;

• claims by tenants, vendors or other persons dealing with the former owners of the properties;

• liabilities incurred in the ordinary course of business; and

• claims for indemnification by general partners, directors, officers and others indemnified by the former owners of the properties.

We may suffer economic harm as a result of making unsuccessful acquisitions in new markets. We may pursue selective acquisitions of properties in regions where we have not previously owned properties. These acquisitions may entail risks in addition to those we face in other acquisitions where we are familiar with the regions, such as the risk that we do not correctly anticipate conditions or trends in a new market and are therefore not able to operate the acquired property profitably.

We may be unable to execute our plans to develop and construct additional properties. Although the majority of our investments are in currently leased properties, we also develop, construct and redevelop properties, including some that are not fully pre-leased. When we develop, construct and redevelop properties, we assume the risk that actual costs will exceed our budgets, that we will experience conditions which delay or preclude project completion and that projected leasing will not occur. In addition, we generally do not obtain construction financing commitments until the development stage of a project is complete and construction is about to commence. We may find that we are unable to obtain financing needed to continue with the construction activities for such projects.

Our data centers may become obsolete. Data centers are much more expensive investments on a per square foot basis than office properties due to the level of infrastructure required to operate the centers. At the same time, technology, industry standards and service requirements for data centers are rapidly evolving and, as a result, the risk of investments we make in data centers becoming obsolete is higher than office properties. Our data centers may become obsolete due to the development of new systems to deliver power to, or eliminate heat from, the servers housed in the properties, or due to other technological advances. In addition, we may not be able to efficiently upgrade or change power and cooling systems to meet new demands or industry standards without incurring significant costs that we may not be able to pass on to our tenants.

Certain of our properties containing data centers contain space not suitable for lease other than as data centers, which could make it difficult to reposition them for alternative use. Certain of our properties contain data center space, which is highly specialized space containing extensive electrical and mechanical systems that are designed uniquely to run and maintain banks of computer servers. As discussed above, our data centers are subject to obsolescence risks. In the event that we needed to reposition data center space for another use, the renovations required to do so could be difficult and costly, and we may, as a result, deem such renovations to be impractical.

We may suffer adverse effects as a result of the indebtedness that we carry and the terms and covenants that relate to this debt. Some of our properties are pledged by us to support repayment of indebtedness. Any foreclosure on our properties could result in loss of income and asset value. In addition, we rely on borrowings to fund some or all of the costs of construction and development activities, new property acquisitions and other items. Our organizational documents do not limit the amount of indebtedness that we may incur.

Payments of principal and interest on our debt may leave us with insufficient cash to operate our properties or pay distributions to COPT’s shareholders required to maintain its qualification as a REIT. We are also subject to the risks that:

• we may not be able to refinance our existing indebtedness, or may refinance on terms that are less favorable to us than the terms of our existing indebtedness;

• in the event of our default under the terms of our Revolving Credit Facility, COPLP could be restricted from making cash distributions to COPT, which could result in reduced distributions to our equityholders or the need for us to incur additional debt to fund these distributions; and

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• if we are unable to pay our debt service on time or are unable to comply with restrictive financial covenants in certain of our debt, our lenders could foreclose on our properties securing such debt and, in some cases, other properties and assets that we own.

Some of our unsecured debt is cross-defaulted, which means that failure to pay interest or principal on the debt above a threshold value will create a default on certain of our other debt.

If interest rates were to rise, our debt service payments on debt with variable interest rates would increase.

As of December 31, 2015, our scheduled debt maturities over the next five years were as follows:

Year	Amount (1)
	(in thousands)
2016	$	208,109
2017	3,252
2018	3,400
2019	167,014
2020	315,252

(1) Represents principal maturities only and therefore excludes net debt discounts and deferred financing costs. As of December 31, 2015, maturities include $43.5 million in 2019 that may be extended to 2020, subject to certain conditions.

Our operations likely will not generate enough cash flow to repay some or all of this debt without additional borrowings, equity issuances and/or property sales. If we cannot refinance our debt, extend the repayment dates, or raise additional equity prior to the dates when our debt matures, we would default on our existing debt.

A downgrade in our credit ratings would materially adversely affect our business and financial condition. COPLP’s Senior Notes are currently rated investment grade by the three major rating agencies. These credit ratings are subject to ongoing evaluation by the credit rating agencies and can change. Any downgrades in terms of ratings or outlook by the credit rating agencies would have a material adverse impact on our cost and availability of capital and also have a material adverse effect on the market price of COPT’s common shares.

We have certain distribution requirements that reduce cash available for other business purposes. Since COPT is a REIT, it must distribute at least 90% of its annual taxable income, which limits the amount of cash that can be retained for other business purposes, including amounts to fund acquisitions and development activity. Also, it is possible that because of the differences between the time we actually receive revenue or pay expenses and the period during which we report those items for distribution purposes, we may have to borrow funds for COPT to meet the 90% distribution requirement.

We may be unable to continue to make equityholders distributions at expected levels. We expect to make regular quarterly cash distributions to our equityholders. However, our ability to make such distributions depends on a number of factors, some of which are beyond our control. Some of our loan agreements contain provisions that could, in the event of default, restrict future distributions. Our ability to make distributions at expected levels will also be dependent, in part, on other matters, including, but not limited to:

• continued property occupancy and timely receipt of rent obligations;

• the amount of future capital expenditures and expenses relating to our properties;

• the level of leasing activity and future rental rates;

• the strength of the commercial real estate market;

• our ability to compete;

• governmental actions and initiatives, including risks associated with the impact of a prolonged government shutdown or budgetary reductions or impasses;

• our costs of compliance with environmental and other laws;

• our corporate overhead levels;

• our amount of uninsured losses; and

• our decision to reinvest in operations rather than distribute available cash.

In addition, we can make distributions to the holders of our common shares/units only after we make preferential distributions to holders of our preferred shares/units.

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Our ability to pay distributions may be limited, and we cannot provide assurance that we will be able to pay distributions regularly. Our ability to pay distributions will depend on a number of things discussed elsewhere herein, including our ability to operate profitably and generate cash flow from our operations. We cannot guarantee that we will be able to pay distributions on a regular quarterly basis in the future. Additionally, the terms of some of COPLP’s debt may limit its ability to make some types of payments and other distributions to COPT in the event of certain default situations. This in turn may limit our ability to make some types of payments, including payment of distributions on common or preferred shares/units, unless we meet certain financial tests or such payments or distributions are required to maintain COPT’s qualification as a REIT. As a result, if we are unable to meet the applicable financial tests, we may not be able to pay distributions in one or more periods. Furthermore, any new common or preferred shares/units that may in the future be issued for raising capital, financing acquisitions, share-based compensation arrangements or otherwise will increase the cash required to continue to pay cash distributions at current levels.

We may incur additional indebtedness, which may harm our financial position and cash flow and potentially impact our ability to pay distributions to equityholders. Our governing documents do not limit us from incurring additional indebtedness and other liabilities. As of December 31, 2015, we had $2.1 billion of indebtedness outstanding. We may incur additional indebtedness and become more highly leveraged, which could harm our financial position.

Our ability to pay distributions is further limited by the requirements of Maryland law. As a Maryland REIT, COPT may not under applicable Maryland law make a distribution if either of the following conditions exists after giving effect to the distribution: (1) the REIT would not be able to pay its debts as the debts become due in the usual course of business; or (2) the REIT’s total assets would be less than the sum of its total liabilities plus the amount that would be needed, if the REIT were dissolved at the time of the distribution, to satisfy upon dissolution the rights of equityholders whose preferential rights are superior to those receiving the distribution. Therefore, we may not be able to make expected distributions to our equityholders if either of the above described conditions exists for COPT after giving effect to the distribution.

We may issue additional common or preferred shares/units that dilute our equityholders’ interests. We may issue additional common and preferred shares/units without shareholder approval. Similarly, COPT may cause COPLP to issue its common or preferred units for contributions of cash or property without approval by the limited partners of COPLP or COPT’s shareholders. Our existing equityholders’ interests could be diluted if such additional issuances were to occur.

We may suffer economic harm as a result of the actions of our partners in real estate joint ventures and other investments. We may invest in certain entities in which we are not the exclusive investor or principal decision maker. Investments in such entities may, under certain circumstances, involve risks not present when a third party is not involved, including the possibility that the other parties to these investments might become bankrupt or fail to fund their share of required capital contributions. Our partners in these entities may have economic, tax or other business interests or goals that are inconsistent with our business interests or goals, and may be in a position to take actions contrary to our policies or objectives. Such investments may also lead to impasses, for example, as to whether to sell a property, because neither we nor the other parties to these investments may have full control over the entity. In addition, we may in certain circumstances be liable for the actions of the other parties to these investments.

We may be subject to possible environmental liabilities. We are subject to various Federal, state and local environmental laws, including air and water quality, hazardous or toxic substances and health and safety. These laws can impose liability on current and prior property owners or operators for the costs of removal or remediation of hazardous substances released on a property, even if the property owner was not responsible for, or even aware of, the release of the hazardous substances. Costs resulting from environmental liability could be substantial. The presence of hazardous substances on our properties may also adversely affect occupancy and our ability to sell or borrow against those properties. In addition to the costs of government claims under environmental laws, private plaintiffs may bring claims for personal injury or other reasons. Additionally, various laws impose liability for the costs of removal or remediation of hazardous substances at the disposal or treatment facility. Anyone who arranges for the disposal or treatment of hazardous substances at such a facility is potentially liable under such laws. These laws often impose liability on an entity even if the facility was not owned or operated by the entity.

Although most of our properties have been subject to varying degrees of environmental assessment, many of these assessments are limited in scope and may not include or identify all potential environmental liabilities or risks associated with the property.  Identification of new compliance concerns or undiscovered areas of contamination, changes in the extent or known scope of contamination, discovery of additional sites, human exposure to the contamination or changes in cleanup or compliance requirements could result in significant costs to us.

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Terrorist attacks may adversely affect the value of our properties, our financial position and cash flows. We have significant investments in properties located in large metropolitan areas and near military installations. Future terrorist attacks could directly or indirectly damage our properties or cause losses that materially exceed our insurance coverage. After such an attack, tenants in these areas may choose to relocate their businesses to areas of the United States that may be perceived to be less likely targets of future terrorist activity, and fewer customers may choose to patronize businesses in these areas. This in turn would trigger a decrease in the demand for space in these areas, which could increase vacancies in our properties and force us to lease space on less favorable terms.

We may be subject to other possible liabilities that would adversely affect our financial position and cash flows. Our properties may be subject to other risks related to current or future laws, including laws benefiting disabled persons, state or local laws relating to zoning, construction, fire and life safety requirements and other matters. These laws may require significant property modifications in the future and could result in the levy of fines against us. In addition, although we believe that we adequately insure our properties, we are subject to the risk that our insurance may not cover all of the costs to restore a property that is damaged by a fire or other catastrophic events, including acts of war or, as mentioned above, terrorism.

We may be subject to increased costs of insurance and limitations on coverage, particularly regarding acts of terrorism. Our portfolio of properties is insured for losses under our property, casualty and umbrella insurance policies through September 30, 2016. These policies include coverage for acts of terrorism. Future changes in the insurance industry’s risk assessment approach and pricing structure may increase the cost of insuring our properties and decrease the scope of insurance coverage. Most of our loan agreements contain customary covenants requiring us to maintain insurance. Although we believe that we have adequate insurance coverage for purposes of these agreements, we may not be able to obtain an equivalent amount of coverage at reasonable costs, or at all, in the future. In addition, if lenders insist on greater coverage than we are able to obtain, it could adversely affect our ability to finance and/or refinance our properties and execute our growth strategies.

Our business could be adversely affected by a negative audit by the United States Government. Agencies of the United States, including the Defense Contract Audit Agency and various agency Inspectors General, routinely audit and investigate government contractors. These agencies review a contractor’s performance under its contracts, cost structure and compliance with applicable laws, regulations, and standards. The United States Government also reviews the adequacy of, and a contractor’s compliance with, its internal control systems and policies. Any costs found to be misclassified may be subject to repayment. If an audit or investigation uncovers improper or illegal activities, we may be subject to civil or criminal penalties and administrative sanctions, including termination of contracts, forfeiture of profits, suspension of payments, fines, and suspension or prohibition from doing business with the United States Government. In addition, we could suffer serious reputational harm if allegations of impropriety were made against us.

Our business could be adversely affected by security breaches through cyber attacks, cyber intrusions or otherwise. We face risks associated with security breaches and other significant disruptions of our information technology networks and related systems, which are essential to our business operations. Such breaches and disruptions may occur through cyber attacks or cyber intrusions over the Internet, malware, computer viruses, attachments to e-mails, persons inside our organization or persons with access to systems inside our organization. Because of our concentration on serving United States Government agencies and their contractors with a general focus on national security and information technology, we may be especially likely to be targeted by cyber attacks, including by governments, organizations or persons hostile to our government.  Despite our activities to maintain the security and integrity of our networks and related systems, as well as purchasing available insurance coverage, there can be no absolute assurance that these activities will be effective in mitigating these risks. A security breach involving our networks and related systems could disrupt our operations in numerous ways, including by creating difficulties for our tenants that may reflect poorly on us.

COPT’s ownership limits are important factors. COPT’s Declaration of Trust limits ownership of its common shares by any single shareholder to 9.8% of the number of the outstanding common shares or 9.8% of the value of the outstanding common shares, whichever is more restrictive. COPT’s Declaration of Trust also limits ownership by any single shareholder of our common and preferred shares in the aggregate to 9.8% of the aggregate value of the outstanding common and preferred shares. We call these restrictions the “Ownership Limit.” COPT’s Declaration of Trust allows our Board of Trustees to exempt shareholders from the Ownership Limit. The Ownership Limit and the restrictions on ownership of our common shares may delay or prevent a transaction or a change of control that might involve a premium price for our common shares/units or otherwise be in the best interest of our equityholders.

COPT’s Declaration of Trust includes other provisions that may prevent or delay a change of control. Subject to the requirements of the New York Stock Exchange, our Board of Trustees has the authority, without shareholder approval, to issue additional securities on terms that could delay or prevent a change in control. In addition, our Board of Trustees has the

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authority to reclassify any of our unissued common shares into preferred shares. Our Board of Trustees may issue preferred shares with such preferences, rights, powers and restrictions as our Board of Trustees may determine, which could also delay or prevent a change in control.

The Maryland business statutes impose potential restrictions that may discourage a change of control of our company. Various Maryland laws may have the effect of discouraging offers to acquire us, even if the acquisition would be advantageous to equityholders. Resolutions adopted by our Board of Trustees and/or provisions of our bylaws exempt us from such laws, but our Board of Trustees can alter its resolutions or change our bylaws at any time to make these provisions applicable to us.

COPT’s failure to qualify as a REIT would have adverse tax consequences, which would substantially reduce funds available to make distributions to our equityholders. We believe that COPT has qualified for taxation as a REIT for Federal income tax purposes since 1992. We plan for COPT to continue to meet the requirements for taxation as a REIT. Many of these requirements, however, are highly technical and complex. The determination that we are a REIT requires an analysis of various factual matters and circumstances that may not be totally within our control. For example, to qualify as a REIT, at least 95% of COPT’s gross income must come from certain sources that are specified in the REIT tax laws. COPT is also required to distribute to shareholders at least 90% of its REIT taxable income (excluding capital gains). The fact that COPT holds most of its assets through COPLP and its subsidiaries further complicates the application of the REIT requirements. Even a technical or inadvertent mistake could jeopardize COPT’s REIT status. Furthermore, Congress and the Internal Revenue Service might make changes to the tax laws and regulations and the courts might issue new rulings that make it more difficult or impossible for COPT to remain qualified as a REIT.

If COPT fails to qualify as a REIT, it would be subject to Federal income tax at regular corporate rates. Also, unless the Internal Revenue Service granted us relief under certain statutory provisions, COPT would remain disqualified as a REIT for four years following the year it first fails to qualify. If COPT fails to qualify as a REIT, it would have to pay significant income taxes and would therefore have less money available for investments or for distributions to our equityholders. In addition, if COPT fails to qualify as a REIT, it will no longer be required to pay distributions to shareholders. As a result of all these factors, COPT’s failure to qualify as a REIT could impair our ability to expand our business and raise capital and would likely have a significant adverse effect on the value of our shares/units.

We could face possible adverse changes in tax laws, which may result in an increase in our tax liability. From time to time, changes in state and local tax laws or regulations are enacted that may result in an increase in our tax liability. The shortfall in tax revenues for states and municipalities in recent years may lead to an increase in the frequency and size of such changes. If such changes occur, we may be required to pay additional taxes on our assets or income.

A number of factors could cause our security prices to decline. As is the case with any publicly-traded securities, certain factors outside of our control could influence the value of COPT’s common and preferred shares. These conditions include, but are not limited to:

• market perception of REITs in general and office REITs in particular;

• market perception regarding our major tenants and sector concentrations;

• the level of institutional investor interest in COPT;

• general economic and business conditions;

• prevailing interest rates;

• our financial performance;

• our underlying asset value;

• market perception of our financial condition, performance, dividends and growth potential; and

• adverse changes in tax laws.

We may experience significant losses and harm to our financial condition if financial institutions holding our cash and cash equivalents file for bankruptcy protection. We believe that we maintain our cash and cash equivalents with high quality financial institutions. We have not experienced any losses to date on our deposited cash. However, we may incur significant losses and harm to our financial condition in the future if any of these financial institutions files for bankruptcy protection.

Item 1B. Unresolved Staff Comments

None

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Item 2. Properties

The following table provides certain information about our office property segments as of December 31, 2015 (dollars and square feet in thousands, except per square foot amounts):

Segment	Number of Buildings	Rentable Square Feet	Occupancy (1)		Annualized Rental Revenue (2)		Annualized Rental Revenue per Occupied Square Foot (2)(3)
Defense/IT Locations:
Fort Meade/BW Corridor:
National Business Park (Annapolis Junction, MD)	29	3,485	97.4	%	$	126,271	$37.19
Howard County, MD	33	2,695	94.6	%	68,916		27.04
Other	28	1,998	89.5	%	47,149		26.37
Subtotal / Average	90	8,178	94.5	%	242,336		31.35
Northern Virginia Defense/IT	13	1,934	81.9	%	50,567		31.91
Lackland Air Force Base	7	953	100.0	%	40,672		42.68
Navy Support Locations	21	1,262	72.1	%	25,333		27.85
Redstone Arsenal	6	632	97.0	%	13,262		21.63
Data Center Shells	9	1,415	100.0	%	22,805		16.11
Defense/IT Locations Subtotal / Average	146	14,374	91.9	%	394,975		29.91
Regional Office (4)	24	3,202	95.4	%	86,996		28.48
Other Properties (5)	7	477	57.3	%	6,691		24.45
Total Portfolio	177	18,053	91.6	%	$	488,662	$29.55

(1)    This percentage is based upon all rentable square feet under lease terms that were in effect as of December 31, 2015.

(2) Annualized rental revenue is the monthly contractual base rent as of December 31, 2015 (ignoring free rent then in effect) multiplied by 12, plus the estimated annualized expense reimbursements under existing leases. We consider annualized rental revenue to be a useful measure for analyzing revenue sources because, since it is point-in-time based, it does not contain increases and decreases in revenue associated with periods in which lease terms were not in effect; historical revenue under generally accepted accounting principles does contain such fluctuations. We find the measure particularly useful for leasing, tenant, segment and industry analysis.

(3) Annualized rental revenue per occupied square foot is a property’s annualized rental revenue divided by that property’s occupied square feet as of December 31, 2015. Our computation of annualized rental revenue excludes the effect of lease incentives. The annualized rent per occupied square foot, including the effect of lease incentives, was $29.37 for our total office portfolio, $31.26 for Fort Meade/BW Corridor (our largest Defense/IT Location subsector) and $28.29 for our Regional Office portfolio.

(4) Includes 13 properties classified as held for sale as of December 31, 2015.

(5) Includes two properties classified as held for sale as of December 31, 2015.

18

The following table provides certain information about our office properties that were under, or contractually committed for, construction, or had redevelopment underway, or otherwise approved, as of December 31, 2015 (dollars and square feet in thousands):

Property and Location	Submarket	Estimated Rentable Square Feet Upon Completion	Percentage Leased		Calendar Quarter of Anticipated Completion	Costs Incurred to Date (1)		Estimated Costs to Complete (1)
Under Construction
Fort Meade/Baltimore/Washington Corridor:
310 Sentinel Way	National	191	0	%	1Q 2016	$	38,838	$	15,514
Annapolis Junction, Maryland	Business Park
7880 Milestone Parkway	Arundel	120	74	%	3Q 2016	29,356		2,179
Hanover, Maryland	Preserve
540 National Business Parkway	National	145	49	%	4Q 2017	12,636		31,076
Annapolis Junction, Maryland	Business Park
Subtotal / Average		456	35	%		80,830		48,769
Data Center Shells:
Patriot Point - DC 15	Ashburn	149	100	%	1Q 2016	19,482		10,268
Ashburn, Virginia	Crossing
Patriot Point - DC 16	Ashburn	149	100	%	2Q 2016	16,478		13,362
Ashburn, Virginia	Crossing
Patriot Point - DC 17 (2)	Ashburn	149	100	%	3Q 2016	6,550		16,120
Ashburn, Virginia	Crossing
Subtotal / Average		447	100	%		42,510		39,750
Northern Virginia Defense/IT:
NOVA Office B	Other	161	0	%	2Q 2016	30,336		11,164
Northern Virginia	Virginia
NOVA Office D	Other	240	100	%	1Q 2018	8,473		38,052
Northern Virginia	Virginia
Subtotal / Average		401	60	%		38,809		49,216
Redstone Arsenal:
2100 Redstone Gateway	Redstone	19	58	%	2Q 2017	2,677		2,356
Huntsville, Alabama	Gateway
Total Under Construction		1,323	65	%		$	164,826	$	140,091
Under Redevelopment
Fort Meade/Baltimore/Washington Corridor:
6708 Alexander Bell Drive	Howard County	52	0	%	1Q 2016	$	7,918	$	3,390
Columbia, MD	Perimeter
7134 Columbia Gateway Drive	Howard County	22	0	%	1Q 2017	1,923		2,226
Columbia, MD	Perimeter
1201 Winterson Road (AS 13)	Airport	68	0	%	1Q 2017	10,100		5,751
Linthicum, MD	Square
Airport Landing - Retail Buildings	Airport	14	56	%	3Q 2017	1,488		4,895
Linthicum, MD	Square
Airport Landing - Pad Site	Airport	N/A	100	%	4Q 2016	259		405
Linthicum, MD	Square
Total Under Redevelopment		156	8	%		$	21,688	$	16,667

(1) Includes land, construction, leasing costs and allocated portion of structured parking and other shared infrastructure, if applicable.

(2) This property became 100% leased on January 8, 2016.

19

The following table provides certain information about our land held or under pre-construction as of December 31, 2015, including properties under ground lease to us (square feet in thousands):

Segment	Acres	Estimated Developable Square Feet
Defense IT Locations:
Fort Meade/BW Corridor:
National Business Park	233	1,956
Howard County	27	590
Other	143	1,629
Total Fort Meade/BW Corridor	403	4,175
NoVA Defense/IT	64	1,614
Lackland AFB	68	1,033
Navy Support Locations	44	109
Redstone Arsenal (1)	428	4,084
Total Defense/IT Locations	1,007	11,015
Regional Office	52	1,613
Total land owned/controlled for future development	1,059	12,628
Other land owned/controlled	282	3,278
Land held for sale	98	1,675
Total land owned/controlled	1,439	17,581

(1) This land is owned by the Unites States Government and is under a long term enhanced-use lease to us. We are not required to pay rent on the individual land sites included in this lease until tenants of properties completed on such land sites begin paying rent.

The following table provides certain information about our wholesale data center property as of December 31, 2015 (square feet in thousands):

Property and Location	Year Built	Critical Load (in megawatts)	Megawatts Leased
9651 Hornbaker Road - Manassas, VA	2010	19.25	17.81

20

Lease Expirations

The following table provides a summary schedule of the lease expirations for leases in place at our office properties as of December 31, 2015, assuming that none of the tenants exercise any early termination rights. This analysis includes the effect of early renewals completed on existing leases but excludes the effect of new tenant leases on 209,000 square feet executed but yet to commence as of December 31, 2015 (dollars and square feet in thousands, except per square foot amounts):

Year of Lease Expiration (1)	Number of Leases Expiring	Square Footage of Leases Expiring	Percentage of Total Occupied Square Feet		Annualized Rental Revenue of Expiring Leases (2)		Percentage of Total Annualized Rental Revenue Expiring (2)		Total Annualized Rental Revenue of Expiring Leases Per Occupied Square Foot
					(in thousands)
2016	105	1,368	8.3	%	$	40,830	8.4	%		$29.86
2017	85	1,858	11.2	%	57,284		11.7	%	30.83
2018	98	2,361	14.3	%	73,200		15.0	%	31.00
2019	94	2,221	13.4	%	69,194		14.2	%	31.15
2020	100	2,395	14.5	%	71,797		14.7	%	29.98
2021	51	1,198	7.2	%	34,950		7.1	%	29.18
2022	24	989	6.0	%	31,004		6.3	%	31.34
2023	27	884	5.3	%	19,810		4.0	%	22.41
2024	16	772	4.7	%	17,879		3.6	%	23.15
2025	26	1,752	10.6	%	53,571		11.0	%	30.58
2026	9	379	2.3	%	9,660		2.0	%	25.46
2027	1	32	0.2	%	900		0.2	%	27.78
2028	1	127	0.8	%	3,765		0.8	%	29.70
2030	3	199	1.2	%	4,818		1.0	%	24.22
Total/Weighted Average	640	16,535	100.0	%	$	488,662	100.0	%		$29.55

With regard to leases expiring in 2016, we believe that the weighted average annualized rental revenue per occupied square foot for such leases as of December 31, 2015 was, on average, approximately 2% to 3% higher than estimated current market rents for the related space, with specific results varying by market.

The following table provides a summary schedule of the lease expirations for leases in place at our wholesale data center property as of December 31, 2015 (dollars and square feet in thousands):

Year of Lease Expiration (1)	Number of Leases Expiring	Raised Floor Square Footage Expiring	Critical Load Leased (in megawatts)	Critical Load Used (in megawatts)	Annualized Rental Revenue of Expiring Leases (2)
2016	2	22	4.00	2.00	$	4,320
2018	2	1	0.26	0.26	527
2019	1	6	1.00	1.00	2,228
2020	2	19	11.55	13.38	13,343
2022	1	6	1.00	1.00	1,521
Total/Weighted Average	8	54	17.81	17.64	$	21,939

(1) The leasing statistics set forth above assume no exercise of any existing early termination rights. Most of the leases with our largest tenant, the United States Government, provide for consecutive one-year terms; all of the leasing statistics set forth above assume that the United States Government will remain in the space that they lease through the end of the respective arrangements, without ending consecutive one-year leases prematurely.

(2) Annualized rental revenue is the monthly contractual base rent as of December 31, 2015 multiplied by 12, plus the estimated annualized expense reimbursements under existing office leases. Our computation of annualized rental revenue excludes the effect of lease incentives, although the effect of this exclusion is generally not material.

21

Item 3. Legal Proceedings

We are not currently involved in any material litigation nor, to our knowledge, is any material litigation currently threatened against the Company or the Operating Partnership (other than routine litigation arising in the ordinary course of business, substantially all of which is expected to be covered by liability insurance).

Item 4. Mine Safety Disclosures

Not applicable.

PART II

Item 5. Market for Registrants’ Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

COPT’s common shares trade on the New York Stock Exchange (“NYSE”) under the symbol “OFC.” The table below shows the range of the high and low sale prices for COPT’s common shares as reported on the NYSE, as well as the quarterly common share dividends per share declared:

	Price Range		Dividends
2014	Low	High	Per Share
First Quarter	$23.55	$27.28	$0.2750
Second Quarter	$26.18	$29.09	$0.2750
Third Quarter	$25.53	$29.44	$0.2750
Fourth Quarter	$25.29	$29.24	$0.2750
	Price Range		Dividends
2015	Low	High	Per Share
First Quarter	$28.26	$30.94	$0.2750
Second Quarter	$23.47	$29.87	$0.2750
Third Quarter	$20.13	$24.81	$0.2750
Fourth Quarter	$20.82	$23.96	$0.2750

The number of holders of record of COPT’s common shares was 489 as of December 31, 2015.This number does not include shareholders whose shares are held of record by a brokerage house or clearing agency, but does include any such brokerage house or clearing agency as one record holder.

COPT pays dividends at the discretion of its Board of Trustees. COPT’s ability to pay cash dividends will be dependent upon: (1) the cash flow generated from our operations; (2) cash generated or used by our financing and investing activities; and (3) the annual distribution requirements under the REIT provisions of the Code described above and such other factors as the Board of Trustees deems relevant. COPT’s ability to make cash dividends will also be limited by the terms of COPLP’s Partnership Agreement, as well as by limitations imposed by state law. In addition, COPT is prohibited from paying cash dividends in excess of the amount necessary for it to qualify for taxation as a REIT if a default or event of default exists pursuant to the terms of our Revolving Credit Facility; this restriction does not currently limit COPT’s ability to pay dividends, and COPT does not believe that this restriction is reasonably likely to limit its ability to pay future dividends because it expects to comply with the terms of our Revolving Credit Facility.

There is no established public trading market for COPLP’s partnership units. Quarterly common unit distributions per unit were the same as quarterly common dividends per share declared by COPT. As of December 31, 2015, there were 36 holders of record of COPLP’s common units.

22

COPT’s Common Shares Performance Graph

The graph and the table set forth below assume $100 was invested on December 31, 2010 in COPT’s common shares. The graph and the table compare the cumulative return (assuming reinvestment of dividends) of this investment with a $100 investment at that time in the S&P 500 Index or the All Equity REIT Index of the National Association of Real Estate Investment Trusts (“NAREIT”):

	Period Ended
Index	12/31/10		12/31/11		12/31/12		12/31/13		12/31/14		12/31/15
Corporate Office Properties Trust	$	100.00	$	64.79	$	79.78	$	79.07	$	98.59	$	79.45
S&P 500	100.00		102.11		118.45		156.82		178.28		180.75
NAREIT All Equity REIT Index	100.00		108.28		129.62		133.32		170.68		175.51

23

Item 6. Selected Financial Data

The following tables set forth summary historical consolidated financial data and operating data for COPT and COPLP and their respective subsidiaries as of and for each of the years ended December 31, 2011 through 2015. You should read the following summary historical financial data in conjunction with the consolidated historical financial statements and notes thereto of COPT and its subsidiaries and COPLP and its subsidiaries and the section of this report entitled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” for additional information.

Corporate Office Properties Trust and Subsidiaries
(in thousands, except per share data and number of properties)
	2015			2014			2013			2012			2011
Revenues
Revenues from real estate operations (1)	$	519,064		$	479,725		$	460,997		$	434,299		$	408,611
Construction contract and other service revenues	106,402			106,748			62,363			73,836			84,345
Total revenues	625,466			586,473			523,360			508,135			492,956
Expenses
Property operating expenses (1)	194,494			179,934			167,199			159,206			154,375
Depreciation and amortization associated with real estate operations (1)	140,025			136,086			113,214			107,998			107,003
Construction contract and other service expenses	102,696			100,058			58,875			70,576			81,639
Impairment losses (1)	23,289			1,416			5,857			43,678			83,213
General, administrative and leasing expenses (1)	31,361			31,794			30,869			31,900			30,306
Business development expenses and land carry costs	13,507			5,573			5,436			5,711			6,122
Total operating expenses	505,372			454,861			381,450			419,069			462,658
Operating income	120,094			131,612			141,910			89,066			30,298
Interest expense (1)	(89,074		)	(92,393		)	(82,010		)	(86,401		)	(90,037		)
Interest and other income	4,517			4,923			3,834			7,172			5,603
Gain (loss) on early extinguishment of debt	85,275			(9,552		)	(27,030		)	(943		)	(1,639		)
Loss on interest rate derivatives	—			—			—			—			(29,805		)
Income (loss) from continuing operations before equity in income (loss) of unconsolidated entities and income taxes	120,812			34,590			36,704			8,894			(85,580		)
Equity in income (loss) of unconsolidated entities	62			229			2,110			(546		)	(331		)
Income tax (expense) benefit	(199		)	(310		)	(1,978		)	(381		)	6,710
Income (loss) from continuing operations	120,675			34,509			36,836			7,967			(79,201		)
Discontinued operations (1)(2)	156			26			55,692			12,353			(51,107		)
Income (loss) before gain on sales of real estate	120,831			34,535			92,528			20,320			(130,308		)
Gain on sales of real estate, net of income taxes (3)	68,047			10,671			9,016			21			2,732
Net income (loss)	188,878			45,206			101,544			20,341			(127,576		)
Net (income) loss attributable to noncontrolling interests	(10,578		)	(4,951		)	(7,837		)	636			8,148
Net income (loss) attributable to COPT	178,300			40,255			93,707			20,977			(119,428		)
Preferred share dividends	(14,210		)	(15,939		)	(19,971		)	(20,844		)	(16,102		)
Issuance costs associated with redeemed preferred shares (4)	—			(1,769		)	(2,904		)	(1,827		)	—
Net income (loss) attributable to COPT common shareholders	$	164,090		$	22,547		$	70,832		$	(1,694	)	$	(135,530	)
Basic earnings per common share (5)
Income (loss) from continuing operations	$	1.74		$	0.25		$	0.21		$	(0.19	)	$	(1.28	)
Net income (loss)	$	1.74		$	0.25		$	0.83		$	(0.03	)	$	(1.97	)
Diluted earnings per common share (5)
Income (loss) from continuing operations	$	1.74		$	0.25		$	0.21		$	(0.19	)	$	(1.28	)
Net income (loss)	$	1.74		$	0.25		$	0.83		$	(0.03	)	$	(1.97	)
Weighted average common shares outstanding – basic	93,914			88,092			85,167			73,454			69,382
Weighted average common shares outstanding – diluted	97,667			88,263			85,224			73,454			69,382

24

	2015			2014			2013			2012			2011
Balance Sheet Data (as of year end):
Total properties, net	$	3,349,748		$	3,296,914		$	3,214,301		$	3,163,044		$	3,352,975
Total assets (6)	$	3,909,312		$	3,664,236		$	3,621,251		$	3,641,935		$	3,850,133
Debt (6)	$	2,077,752		$	1,914,036		$	1,919,002		$	2,007,344		$	2,412,881
Total liabilities (6)	$	2,273,530		$	2,124,935		$	2,106,244		$	2,195,138		$	2,635,326
Redeemable noncontrolling interests	$	19,218		$	18,417		$	17,758		$	10,298		$	8,908
Total equity	$	1,616,564		$	1,520,884		$	1,497,249		$	1,436,499		$	1,205,899
Other Financial Data (for the year ended):
Cash flows provided by (used in):
Operating activities	$	204,008		$	193,885		$	158,979		$	191,838		$	152,143
Investing activities	$	(307,532	)	$	(209,689	)	$	(119,790	)	$	13,744		$	(260,387	)
Financing activities	$	157,757		$	(32,492	)	$	4,590		$	(200,547	)	$	103,701
Numerator for diluted EPS	$	169,787		$	22,115		$	70,418		$	(2,163	)	$	(136,567	)
Diluted funds from operations (7)	$	249,454		$	155,296		$	214,149		$	165,720		$	53,062
Diluted funds from operations per share (7)	$	2.55		$	1.69		$	2.40		$	2.13		$	0.72
Cash dividends declared per common share	$	1.10		$	1.10		$	1.10		$	1.10		$	1.65
Property Data (as of year end):
Number of properties owned (8)	177			173			183			208			238
Total rentable square feet owned (8)	18,053			16,790			17,370			18,831			20,514

(1) Certain prior period amounts pertaining to properties included in discontinued operations have been reclassified to conform with the current presentation. These reclassifications did not affect consolidated net income or shareholders’ equity.

(2) Includes income derived from 23 operating properties disposed in 2011, 35 operating properties disposed in 2012 and 31 operating properties disposed in 2013 (see Note 18 to our consolidated financial statements).

(3) Reflects gain from sales of properties and unconsolidated real estate joint ventures not associated with discontinued operations.

(4) Reflects a decrease to net income available to common shareholders pertaining to the original issuance costs recognized upon the redemption of the Series G Preferred Shares in 2012, Series J Preferred Shares in 2013 and Series H Preferred Shares in 2014.

(5) Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of COPT.

(6) Prior period amounts include retrospective adjustments to reclassify net deferred financing costs in connection with recent accounting guidance adopted in 2015.

(7) For definitions of diluted funds from operations per share and diluted funds from operations and reconciliations of these measures to their comparable measures under generally accepted accounting principles, you should refer to the section entitled “Funds from Operations” within the section entitled “Management's Discussion and Analysis of Financial Condition and Results of Operations.”

(8) Amounts reported reflect only operating office properties.

25

Corporate Office Properties, L.P. and Subsidiaries
(in thousands, except per share data and number of properties)
	2015			2014			2013			2012			2011
Revenues
Revenues from real estate operations (1)	$	519,064		$	479,725		$	460,997		$	434,299		$	408,611
Construction contract and other service revenues	106,402			106,748			62,363			73,836			84,345
Total revenues	625,466			586,473			523,360			508,135			492,956
Expenses
Property operating expenses (1)	194,494			179,934			167,199			159,206			154,375
Depreciation and amortization associated with real estate operations (1)	140,025			136,086			113,214			107,998			107,003
Construction contract and other service expenses	102,696			100,058			58,875			70,576			81,639
Impairment losses (1)	23,289			1,416			5,857			43,678			83,213
General, administrative and leasing expenses (1)	31,361			31,794			30,869			31,900			30,300
Business development expenses and land carry costs	13,507			5,573			5,436			5,711			6,122
Total operating expenses	505,372			454,861			381,450			419,069			462,652
Operating income	120,094			131,612			141,910			89,066			30,304
Interest expense (1)	(89,074		)	(92,393		)	(82,010		)	(86,401		)	(90,037		)
Interest and other income	4,517			4,923			3,834			7,172			5,603
Gain (loss) on early extinguishment of debt	85,275			(9,552		)	(27,030		)	(943		)	(1,639		)
Loss on interest rate derivatives	—			—			—			—			(29,805		)
Income (loss) from continuing operations before equity in income (loss) of unconsolidated entities and income taxes	120,812			34,590			36,704			8,894			(85,574		)
Equity in income (loss) of unconsolidated entities	62			229			2,110			(546		)	(331		)
Income tax (expense) benefit	(199		)	(310		)	(1,978		)	(381		)	6,710
Income (loss) from continuing operations	120,675			34,509			36,836			7,967			(79,195		)
Discontinued operations (1)(2)	156			26			55,692			12,353			(51,107		)
Income (loss) before gain on sales of real estate	120,831			34,535			92,528			20,320			(130,302		)
Gain on sales of real estate, net of income taxes (3)	68,047			10,671			9,016			21			2,732
Net income (loss)	188,878			45,206			101,544			20,341			(127,570		)
Net (income) loss attributable to noncontrolling interests	(3,520		)	(3,276		)	(3,907		)	507			244
Net income (loss) attributable to COPLP	185,358			41,930			97,637			20,848			(127,326		)
Preferred unit distributions	(14,870		)	(16,599		)	(20,631		)	(21,504		)	(16,762		)
Issuance costs associated with redeemed preferred units (4)	—			(1,769		)	(2,904		)	(1,827		)	—
Net income (loss) attributable to COPLP common unitholders	$	170,488		$	23,562		$	74,102		$	(2,483	)	$	(144,088	)
Basic earnings per common unit (5)
Income (loss) from continuing operations	$	1.74		$	0.25		$	0.21		$	(0.19	)	$	(1.29	)
Net income (loss)	$	1.74		$	0.25		$	0.83		$	(0.04	)	$	(2.00	)
Diluted earnings per common unit (5)
Income (loss) from continuing operations	$	1.74		$	0.25		$	0.21		$	(0.19	)	$	(1.29	)
Net income (loss)	$	1.74		$	0.25		$	0.83		$	(0.04	)	$	(2.00	)
Weighted average common units outstanding – basic	97,606			91,989			89,036			77,689			72,564
Weighted average common units outstanding – diluted	97,667			92,160			89,093			77,689			72,564

26

	2015			2014			2013			2012			2011
Balance Sheet Data (as of year end):
Total properties, net	$	3,349,748		$	3,296,914		$	3,214,301		$	3,163,044		$	3,352,975
Total assets (6)	$	3,903,549		$	3,658,354		$	3,613,784		$	3,635,159		$	3,842,545
Debt (6)	$	2,077,752		$	1,914,036		$	1,919,002		$	2,007,344		$	2,412,881
Total liabilities (6)	$	2,267,767		$	2,119,053		$	2,098,777		$	2,188,362		$	2,627,738
Redeemable noncontrolling interests	$	19,218		$	18,417		$	17,758		$	10,298		$	8,908
Total equity	$	1,616,564		$	1,520,884		$	1,497,249		$	1,436,499		$	1,205,899
Other Financial Data (for the year ended):
Cash flows provided by (used in):
Operating activities	$	204,008		$	193,885		$	158,979		$	191,838		$	152,149
Investing activities	$	(307,532	)	$	(209,689	)	$	(119,790	)	$	13,744		$	(260,387	)
Financing activities	$	157,757		$	(32,492	)	$	4,590		$	(200,547	)	$	103,695
Numerator for diluted EPU	$	169,782		$	23,130		$	73,688		$	(2,952	)	$	(145,125	)
Cash distributions declared per common unit	$	1.10		$	1.10		$	1.10		$	1.10		$	1.65
Property Data (as of year end):
Number of properties owned (7)	177			173			183			208			238
Total rentable square feet owned (7)	18,053			16,790			17,370			18,831			20,514

(1) Certain prior period amounts pertaining to properties included in discontinued operations have been reclassified to conform with the current presentation. These reclassifications did not affect consolidated net income or shareholders’ equity.

(2) Includes income derived from 23 operating properties disposed in 2011, 35 operating properties disposed in 2012 and 31 operating properties disposed in 2013 (see Note 18 to our consolidated financial statements).

(3) Reflects gain from sales of properties and unconsolidated real estate joint ventures not associated with discontinued operations.

(4) Reflects a decrease to net income available to common shareholders pertaining to the original issuance costs recognized upon the redemption of the Series G Preferred Units in 2012, Series J Preferred Units in 2013 and Series H Preferred Units in 2014.

(5) Basic and diluted earnings per common unit are calculated based on amounts attributable to common unitholders of COPLP.

(6) Prior period amounts include retrospective adjustments to reclassify net deferred financing costs in connection with recent accounting guidance adopted in 2015.

(7) Amounts reported reflect only operating office properties.

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Item 7.    Management's Discussion and Analysis of Financial Condition and Results of Operations

You should refer to our consolidated financial statements and the notes thereto and our Selected Financial Data table as you read this section.

This section contains “forward-looking” statements, as defined in the Private Securities Litigation Reform Act of 1995, that are based on our current expectations, estimates and projections about future events and financial trends affecting the financial condition and operations of our business. Forward-looking statements can be identified by the use of words such as “may,” “will,” “should,” “could,” “believe,” “anticipate,” “expect,” “estimate,” “plan” or other comparable terminology. Forward-looking statements are inherently subject to risks and uncertainties, many of which we cannot predict with accuracy and some of which we might not even anticipate. Although we believe that the expectations, estimates and projections reflected in such forward-looking statements are based on reasonable assumptions at the time made, we can give no assurance that these expectations, estimates and projections will be achieved. Future events and actual results may differ materially from those discussed in the forward-looking statements. Important factors that may affect these expectations, estimates and projections include, but are not limited to:

• general economic and business conditions, which will, among other things, affect office property and data center demand and rents, tenant creditworthiness, interest rates, financing availability and property values;

• adverse changes in the real estate markets, including, among other things, increased competition with other companies;

• governmental actions and initiatives, including risks associated with the impact of a prolonged government shutdown or budgetary reductions or impasses, such as a reduction in rental revenues, non-renewal of leases and/or a curtailment of demand for additional space by our strategic customers;

• our ability to borrow on favorable terms;

• risks of real estate acquisition and development activities, including, among other things, risks that development projects may not be completed on schedule, that tenants may not take occupancy or pay rent or that development or operating costs may be greater than anticipated;

• risks of investing through joint venture structures, including risks that our joint venture partners may not fulfill their financial obligations as investors or may take actions that are inconsistent with our objectives;

• changes in our plans for properties or views of market economic conditions or failure to obtain development rights, either of which could result in recognition of significant impairment losses;

• our ability to satisfy and operate effectively under Federal income tax rules relating to real estate investment trusts and partnerships;

• the dilutive effects of issuing additional common shares;

• our ability to achieve projected results; and

• environmental requirements.

We undertake no obligation to update or supplement forward-looking statements.

Overview

Our revenues relating to real estate operations are derived from rents and property operating expense reimbursements earned from tenants leasing space in our properties. Most of our expenses relating to our real estate operations take the form of property operating costs (such as real estate taxes, utilities and repairs and maintenance) and depreciation and amortization associated with our operating properties. Most of our profitability from real estate operations depends on our ability to maintain high levels of occupancy and increase rents, which is affected by a number of factors, including, among other things, our tenants’ ability to fulfill their lease obligations and their continuing space needs based on variables such as employment levels, business confidence, competition, general economic conditions of the markets in which we operate and governmental actions and initiatives.

Due to our Defense/IT Locations strategy, a large concentration of our revenue is derived from several large tenants. As of December 31, 2015, 63.8% of our annualized rental revenue (as defined below) from office properties was from our 20 largest tenants, 41.9% from our four largest tenants and 29.0% from our largest tenant, the United States Government. In addition, 80.8% of the total annualized rental revenue of our office properties was from Defense/IT Locations properties.

In 2015, we believe that we improved both the strategic focus and quality of our property portfolio through development, acquisition and disposition activities. For our Defense/IT Locations, we

• placed into service an aggregate of 897,000 square feet in seven newly constructed properties that were 100.0% leased as of December 31, 2015, including three data center shells totaling 421,000 square feet; and

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• acquired 2600 Park Tower Drive, a 237,000 square foot property in a transportation-served, urban-like submarket of Northern Virginia that was 100% leased, for $80.5 million on April 15, 2015 primarily using borrowings from our Revolving Credit Facility.

For our Regional Office portfolio, we:

• acquired the following properties in the heart of Baltimore City’s central business district:

◦ 250 W. Pratt Street, a 367,000 square foot property that was 96.2% leased, for $61.8 million on March 19, 2015 primarily using borrowings from our Revolving Credit Facility; and

◦ 100 Light Street, a 558,000 square foot office property in Baltimore, Maryland that was 93.5% leased, and its structured parking garage, 30 Light Street, for $121.2 million on August 7, 2015. In connection with that acquisition, we assumed a $55.0 million mortgage loan, and funded the balance primarily using borrowings from our Revolving Credit Facility; and

• sold seven suburban office properties (five in Baltimore County, Maryland and two in Northern Virginia) totaling 932,000 square feet that were 100% leased upon disposition and land for $198.5 million. The office properties were not located in transportation-served, urban or urban-like locations, and therefore were not deemed to be as strategic as the properties we acquired. While most of the proceeds from these sales were used to repay borrowings under our Revolving Credit Facilty and for general corporate purposes, we also held $57.2 million in cash from these sales as of December 31, 2015 that we expect to use in 2016 to fund development activities.

Our capital activities in 2015 focused on funding our development and acquisition activities and extending our debt maturities by:

• completing the property sales discussed above;

• issuing $300.0 million of 5.000% Senior Notes, which are unsecured and guaranteed by COPT, on June 29, 2015 at an initial offering price of 99.510% of their face value. The proceeds from the offering, after deducting underwriting discounts but before other offering expenses, were approximately $296.6 million. We used the net proceeds of the offering to repay borrowings under our Revolving Credit Facility;

• entering into an unsecured term loan agreement with an initial commitment of $250.0 million, of which we borrowed $100.0 million. We used the proceeds to repay term loan debt previously scheduled to mature in 2016. We have until September 2016 to draw the remaining $150.0 million of the initial commitment, which we expect to use to repay most of our debt maturing in 2016;

• disposing of two office properties in Northern Virgina totaling 665,000 square feet that secured a $150.0 million nonrecourse mortgage loan. On August 28, 2015, ownership in these properties was transferred to the mortgage lender and we removed the debt obligation and accrued interest from our balance sheet; and

• issuing 890,241 COPT common shares at a weighted average price of $30.29 per share under its at-the-market stock offering program established in October 2012. Net proceeds from the shares issued totaled $26.6 million. The net proceeds from the shares issued were contributed to COPLP in exchange for 890,241 common units, and used by COPLP for general corporate purposes.

Our outstanding debt increased in 2015 from year-end 2014 due to the funding requirements of our development and acquisition activities exceeding the effects of the above capital activities. We improved the timing of our debt maturities in 2015 by ending the year with a weighted average debt maturity of 6.1 years, a one-year increase over year-end 2014, and minimal cash or new financing required for scheduled debt maturities through 2018. In addition, the fixed-rate portion of our debt was 90.5% by year-end 2015 (including the effect of variable rate loans subject to interest rate), virtually unchanged from year end 2014.

In the second half of 2015, we determined that we were unwilling to issue common shares at current pricing levels to reduce debt and fund development costs. We concluded instead that sales of selected operating properties and land were our best source of capital. In the preparation of our business plan, we determined that we expect to sell at least $400 million of operating properties and $40 million of land in 2016. In the fourth quarter of 2015, we identified some of these properties that we will attempt to sell, including some land parcels. We also determined that we will not likely develop additional properties on land parcels not proximate to our Defense/IT Locations. As a result of those decisions, we recognized approximately $20 million of impairment losses in the fourth quarter of 2015. As we identify additional properties for sale, we may recognize additional impairment losses.

For an extended number of years, our ability to lease Defense/IT Locations was adversely effected by continuing delays in Federal budget approvals and uncertainty regarding the potential for future reductions in government spending targeting defense. This served to disrupt the Government’s process for awarding contracts to prospective tenants, causing significant

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contraction in the defense contractor sector. In January 2014, the 2014 Consolidated Appropriations Act (the “2014 Act”) was passed, establishing a budget for the 2014 fiscal year that rolled back certain of the defense spending reductions that were to occur under the Budget Control Act of 2011. With the passage of the 2014 Act, defense spending levels were essentially flat in 2014 through September 30, 2015. In November 2015, the Bipartisan Budget Act of 2015 (the “2015 Act”) was passed, adding further clarity for the next two fiscal years, including increases in defense funding. The passage of the 2014 Act enabled the Federal Government to resume a more normalized process for awarding contracts by mid-2014, which served to improve leasing activity for our Defense/IT Locations in 2015, and we believe that the passage of the 2015 Act could serve to continue this trend.  We believe that the knowledge-based activities of most of our tenants will continue to be a priority in defense budgets as such activities are considered increasingly critical to our national security.

Occupancy for our Regional Office properties as of December 31, 2015 was 95.4% (including properties held for sale), a 0.3% increase from year-end 2014. Our Regional Office properties tend to be more subject to general market conditions than our Defense/IT Locations. Of the 24 Regional Office properties owned by us as of December 31, 2015, 13 were held for sale; the remaining properties were 97.1% occupied as of December 31, 2015.

We discuss significant factors contributing to changes in our net income over the last three years in the section below entitled “Results of Operations.” The results of operations discussion is combined for COPT and COPLP because there are no material differences in the results of operations between the two reporting entities.

In addition, the section below entitled “Liquidity and Capital Resources” includes discussions of, among other things:

• how we expect to generate cash for short and long-term capital needs;

• our off-balance sheet arrangements in place that are reasonably likely to affect our financial condition; and

• our commitments and contingencies.

We refer to the measure “annualized rental revenue” in various sections of the Management’s Discussion and Analysis of Financial Condition and Results of Operations section of this Annual Report on Form 10-K. Annualized rental revenue is a measure that we use to evaluate the source of our rental revenue as of a point in time. It is computed by multiplying by 12 the sum of monthly contractual base rents and estimated monthly expense reimbursements under active leases as of a point in time (ignoring free rent then in effect). Our computation of annualized rental revenue excludes the effect of lease incentives, although the effect of this exclusion is generally not material. We consider annualized rental revenue to be a useful measure for analyzing revenue sources because, since it is point-in-time based, it does not contain increases and decreases in revenue associated with periods in which lease terms were not in effect; historical revenue under generally accepted accounting principles in the United States of America (“GAAP”) does contain such fluctuations. We find the measure particularly useful for leasing, tenant, segment and industry analysis.

All of our operating portfolio square footage, occupancy and leasing statistics included below and elsewhere in this Annual Report on Form 10-K exclude the effect of the two properties (totaling 665,000 square feet) that served as collateral for debt in default; effective April 1, 2014, all cash flows from such properties belonged to the lender. On August 28, 2015, ownership in these properties was transferred to the mortgage lender and we removed the debt obligation and accrued interest from our balance sheet. These properties were 25.1% occupied as of the date we transferred ownership.

Critical Accounting Policies and Estimates

Our consolidated financial statements are prepared in accordance with GAAP, which require us to make certain estimates and assumptions. A summary of our significant accounting policies is provided in Note 2 to our consolidated financial statements. The following section is a summary of certain aspects of those accounting policies involving estimates and assumptions that (1) require our most difficult, subjective or complex judgments in accounting for uncertain matters or matters that are susceptible to change and (2) materially affect our reported operating performance or financial condition. It is possible that the use of different reasonable estimates or assumptions in making these judgments could result in materially different amounts being reported in our consolidated financial statements. While reviewing this section, you should refer to Note 2 to our consolidated financial statements, including terms defined therein.

Acquisitions of Properties

When we acquire properties, we allocate the purchase price to numerous tangible and intangible components. Most of the terms in this bullet section are discussed in further detail in Note 2 to the consolidated financial statements entitled “Acquisitions of Properties.” Our process for determining the allocation to these components requires many estimates and assumptions, including the following: (1) determination of market rental rates; (2) estimation of leasing and tenant

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improvement costs associated with the remaining term of acquired leases; (3) assumptions used in determining the in-place lease value, if-vacant value and tenant relationship value, including the rental rates, period of time that it would take to lease vacant space and estimated tenant improvement and leasing costs; (4) renewal probabilities; and (5) allocation of the if-vacant value between land and building. A change in any of the above key assumptions can materially change not only the presentation of acquired properties in our consolidated financial statements but also our reported results of operations. The allocation to different components affects the following:

• the amount of the purchase price allocated among different categories of assets and liabilities on our consolidated balance sheets; the amount of costs assigned to individual properties in multiple property acquisitions; and the amount of gain recognized in our consolidated statements of operations should we determine that the fair value of the acquisition exceeds its cost;

• where the amortization of the components appear over time in our consolidated statements of operations. Allocations to above- and below-market leases are amortized into rental revenue, whereas allocations to most of the other tangible and intangible assets are amortized into depreciation and amortization expense. As a REIT, this is important to us since much of the investment community evaluates our operating performance using non-GAAP measures such as funds from operations, the computation of which includes rental revenue but does not include depreciation and amortization expense; and

• the timing over which the items are recognized as revenue or expense in our consolidated statements of operations. For example, for allocations to the as-if vacant value, the land portion is not depreciated and the building portion is depreciated over a longer period of time than the other components (generally 40 years). Allocations to above- and below-market leases, in-place lease value and tenant relationship value are amortized over significantly shorter timeframes, and if individual tenants’ leases are terminated early, any unamortized amounts remaining associated with those tenants are written off upon termination. These differences in timing can materially affect our reported results of operations. In addition, we establish lives for tenant relationship values based on our estimates of how long we expect the respective tenants to remain in the properties.

Impairment of Long-Lived Assets

We assess each of our operating properties for impairment quarterly using cash flow projections and estimated fair values that we derive for each of the properties.  We update the leasing and other assumptions used in these projections regularly, paying particular attention to properties that have experienced chronic vacancy or face significant market challenges.  We review our plans and intentions for our development projects and land parcels quarterly.  If our analyses indicate that the carrying values of operating properties, properties in development or land held for future development may be impaired, we perform a recovery analysis for such properties. For long-lived assets to be held and used, we analyze recoverability based on the estimated undiscounted future cash flows expected to be generated from the operations and eventual disposition of the assets over, in most cases, a ten-year holding period.  If we believe there is a significant possibility that we might dispose of the assets earlier, we analyze recoverability using a probability weighted analysis of the estimated undiscounted future cash flows expected to be generated from the operations and eventual disposition of the assets over the various possible holding periods.  If the analysis indicates that the carrying value of a tested property is not recoverable from estimated future cash flows, it is written down to its estimated fair value and an impairment loss is recognized. If and when our plans change, we revise our recoverability analyses to use the cash flows expected from the operations and eventual disposition of each asset using holding periods that are consistent with our revised plans.

Property fair values are estimated based on contract prices, indicative bids, discounted cash flow analyses or yield analyses. Estimated cash flows used in such analyses are based on our plans for the property and our views of market and economic conditions. The estimates consider items such as current and future rental rates, occupancies for the tested property and comparable properties, estimated operating and capital expenditures and recent sales data for comparable properties; most of these items are influenced by market data obtained from real estate leasing and brokerage firms and our direct experience with the properties and their markets. Determining the appropriate capitalization or yield rate also requires significant judgment and is typically based on many factors, including the prevailing rate for the market or submarket, as well as the quality and location of the properties. Changes in the estimated future cash flows due to changes in our plans for a property (especially our expected holding period), views of market and economic conditions and/or our ability to obtain development rights could result in recognition of impairment losses which could be substantial.

Properties held for sale are carried at the lower of their carrying values (i.e., cost less accumulated depreciation and any impairment loss recognized, where applicable) or estimated fair values less costs to sell. Accordingly, decisions to sell certain operating properties, properties in development or land held for development will result in impairment losses if carrying values of the specific properties exceed their estimated fair values less costs to sell. The estimates of fair value consider matters such

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as recent sales data for comparable properties and, where applicable, contracts or the results of negotiations with prospective purchasers. These estimates are subject to revision as market conditions, and our assessment of such conditions, change.

Assessment of Lease Term

As discussed above, a significant portion of our portfolio is leased to the United States Government, and the majority of those leases consist of a series of one-year renewal options, or provide for early termination rights. In addition, certain other leases in our portfolio provide early termination rights to tenants. Applicable accounting guidance requires us to recognize minimum rental payments on a straight-line basis over the terms of each lease and to assess the lease terms as including all periods for which failure to renew, or continue, the lease imposes a penalty on the lessee in such amounts that renewal, or continuation, appears, at the inception of the lease, to be reasonably assured. Factors we consider when determining whether a penalty is significant include the uniqueness of the purpose or location of the property, the availability of a comparable replacement property, the relative importance or significance of the property to the continuation of the lessee's line of business and the existence of leasehold improvements or other assets whose value would be impaired by the lessee vacating or discontinuing use of the leased property. For a number of our leases with the United States Government, we have concluded, based on the factors above, that exercise of existing renewal options, or continuation of such leases without exercising early termination rights, is reasonably assured. Changes in these assessments could result in the write-off of any recorded assets associated with straight-line rental revenue and acceleration of depreciation and amortization expense associated with costs we have incurred related to these leases.

Revenue Recognition on Tenant Improvements

Most of our leases involve some form of improvements to leased space. When we are required to provide improvements under the terms of a lease, we need to determine whether the improvements constitute landlord assets or tenant assets. If the improvements are landlord assets, we capitalize the cost of the improvements and recognize depreciation expense associated with such improvements over the shorter of the useful life of the assets or the term of the lease and recognize any payments from the tenant as rental revenue over the term of the lease. If the improvements are tenant assets, we defer the cost of improvements funded by us as a lease incentive asset and amortize it as a reduction of rental revenue over the term of the lease. Our determination of whether improvements are landlord assets or tenant assets also may affect when we commence revenue recognition in connection with a lease.

In determining whether improvements constitute landlord or tenant assets, we consider numerous factors that may require subjective or complex judgments, including: whether the improvements are unique to the tenant or reusable by other tenants; whether the tenant is permitted to alter or remove the improvements without our consent or without compensating us for any lost fair value; whether the ownership of the improvements remains with us or remains with the tenant at the end of the lease term; and whether the economic substance of the lease terms is properly reflected.

Collectability of Accounts and Deferred Rent Receivable

Allowances for doubtful accounts and deferred rent receivable are established based on quarterly analyses of the risk of loss on specific accounts. The analyses place particular emphasis on past-due accounts and consider information such as the nature and age of the receivables, the payment history of the tenants, the financial condition of the tenants and our assessment of their ability to meet their lease obligations, the basis for any disputes and the status of related negotiations. Our estimate of the required allowance is subject to revision as these factors change and is sensitive to the effects of economic and market conditions on tenants.

Activities we conduct to monitor the credit quality of our tenants include the following: monitoring the timeliness of tenant lease payments; reviewing credit ratings of tenants that are rated by a nationally recognized credit agency prior to such tenants’ entry into leases, and monitoring periodically thereafter; reviewing financial statements of tenants that are publicly available or that are required to be provided to us pursuant to the terms of such tenants’ leases; and monitoring news reports regarding our tenants.

Accounting Method for Investments

We use three different accounting methods to report our investments in entities: the consolidation method; the equity method; and the cost method (see Note 2 to our consolidated financial statements). We use the consolidation method when we own most of the outstanding voting interests in an entity and can control its operations. We also consolidate certain entities when control of such entities can be achieved through means other than voting rights (“variable interest entities” or “VIEs”) if we are deemed to be the primary beneficiary. Generally, this applies to entities for which either: (1) the equity investors (if

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any) lack one or more of the essential characteristics of a controlling financial interest; (2) the equity investment at risk is insufficient to finance that entity's activities without additional subordinated financial support; or (3) the equity investors have voting rights that are not proportionate to their economic interests and the activities of the entity involve, or are conducted on behalf of, an investor with a disproportionately small voting interest. We use the equity method of accounting when we own an interest in an entity and can exert significant influence over, but cannot control, the entity's operations.

In making these determinations, we need to make subjective estimates and judgments regarding the entity’s future operating performance, financial condition, future valuation and other variables that may affect the cash flows of the entity. We must consider both our and our partner's ability to participate in the management of the entity’s operations and make decisions that allow the parties to manage their economic risks. We may also need to estimate the probability of different scenarios taking place over time and their effect on the partners’ cash flows. The conclusion reached as a result of this process affects whether or not we use the consolidation method in accounting for our investment or the equity method. Whether or not we consolidate an investment can materially affect our consolidated financial statements.

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Concentration of Operations

Customer Concentration of Property Operations

The table below sets forth the 20 largest tenants in our portfolio of office properties based on percentage of annualized rental revenue:

	Percentage of Annualized Rental
	Revenue of Office Properties
	for 20 Largest Tenants as of December 31,
Tenant	2015		2014		2013
United States of America	29.0	%	27.6	%	24.8	%
Northrop Grumman Corporation (1)	4.6	%	5.0	%	6.1	%
The Boeing Company (1)	4.5	%	3.8	%	2.6	%
General Dynamics Corporation (1)	3.9	%	4.2	%	4.0	%
Computer Sciences Corporation (1)	2.2	%	2.4	%	4.4	%
Vadata Inc.	2.2	%	1.3	%	N/A
CareFirst, Inc.	2.1	%	2.2	%	2.0	%
Booz Allen Hamilton, Inc.	2.0	%	5.4	%	5.8	%
Wells Fargo & Company (1)	1.7	%	1.7	%	1.6	%
Harris Corporation	1.3	%	N/A		N/A
AT&T Corporation (1)	1.2	%	1.3	%	1.3	%
KEYW Corporation	1.2	%	0.8	%	0.8	%
Raytheon Company (1)	1.2	%	0.9	%	0.9	%
Science Applications International Corporation (1)	1.1	%	1.0	%	1.0	%
L-3 Communications Holdings, Inc. (1)	1.1	%	1.2	%	1.3	%
Miles & Stockbridge, PC	1.0	%	N/A		N/A
Transamerica Life Insurance Company	0.9	%	N/A		N/A
University of Maryland	0.9	%	N/A		N/A
Engility Holdings, Inc.	0.9	%	N/A		N/A
Kratos Defense & Security Solution, Inc. (1)	0.9	%	1.0	%	0.9	%
The MITRE Corporation	N/A		2.1	%	2.0	%
TASC Inc.	N/A		0.9	%	0.9	%
ITT Exelis (1)	N/A		0.9	%	1.2	%
The Johns Hopkins Institutions (1)	N/A		0.8	%	0.9	%
Unisys Corporation	N/A		0.8	%	0.8	%
The Aerospace Corporation (1)	N/A		N/A		1.8	%
Subtotal of 20 largest tenants	63.8	%	65.3	%	65.1	%
All remaining tenants	36.2	%	34.7	%	34.9	%
Total	100.0	%	100.0	%	100.0	%
(1) Includes affiliated organizations and agencies and predecessor companies.

The United States Government’s concentration increased each of the last two years in large part due to our dispositions of properties in which it was not a tenant and its occupancy of newly-constructed square feet placed into service.

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Concentration of Property Operations by Segment

The table below sets forth the segment allocation of our annualized rental revenue of office properties as of the end of the last three calendar years:

	Percentage of Annualized Rental						Number of
	Revenue of Office						Office Properties
	Properties as of December 31,						as of December 31,
Region	2015		2014		2013		2015	2014	2013
Defense/IT Locations:
Fort Meade/BW Corridor	49.6	%	51.7	%	49.0	%	90	90	91
Northern Virginia Defense/IT	10.3	%	7.7	%	12.4	%	13	11	13
Lackland Air Force Base	8.3	%	7.6	%	6.6	%	7	6	6
Navy Support Locations	5.2	%	6.2	%	6.5	%	21	20	21
Redstone Arsenal	2.7	%	2.2	%	1.9	%	6	5	4
Data Center Shells	4.7	%	4.0	%	3.1	%	9	6	4
Total Defense/IT Locations	80.8	%	79.4	%	79.5	%	146	138	139
Regional Office	17.8	%	19.0	%	19.1	%	24	28	37
Other	1.4	%	1.6	%	1.4	%	7	7	7
	100.0	%	100.0	%	100.0	%	177	173	183

The increases in the Lackland Air Force Base, Redstone Arsenal and Data Center Shells segments were due to newly constructed properties placed in service. The decrease in Regional Office was due primarily to property dispositions.

Occupancy and Leasing

Office Properties

The tables below set forth occupancy information pertaining to our portfolio of operating office properties:

	December 31,
	2015			2014			2013
Occupancy rates at period end
Total	91.6		%	90.9		%	89.1		%
Defense/IT Locations:
Fort Meade/BW Corridor	94.5		%	93.3		%	91.6		%
Northern Virginia Defense/IT	81.9		%	75.7		%	85.1		%
Lackland Air Force Base	100.0		%	100.0		%	100.0		%
Navy Support Locations	72.1		%	86.0		%	86.0		%
Redstone Arsenal	97.0		%	80.8		%	80.7		%
Data Center Shells	100.0		%	100.0		%	100.0		%
Regional Office	95.4		%	95.1		%	88.4		%
Other	57.3		%	61.1		%	55.6		%
Average contractual annual rental rate per square foot at year end (1)	$	29.55		$	29.27		$	28.99

(1)  Includes estimated expense reimbursements.

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	Rentable Square Feet		Occupied Square Feet
	(in thousands)
December 31, 2014	16,790		15,255
Square feet vacated upon lease expiration (1)	—		(530	)
Occupancy of previously vacated space in connection with new leases (2)	—		484
Square feet constructed or redeveloped	1,067		1,138
Acquisitions	1,162		1,123
Dispositions	(932	)	(932	)
Square feet removed from operations for redevelopment	(22	)	—
Other changes	(12	)	(3	)
December 31, 2015	18,053		16,535

(1)  Includes lease terminations and space reductions occurring in connection with lease renewals.

(2) Excludes occupancy of vacant square feet acquired or developed.

Please refer to the section above entitled “Overview” for discussion regarding our leasing activity in 2015 and our expectations regarding the future outlook. As the table above reflects, the increase in our total occupancy from December 31, 2014 to December 31, 2015 was attributable primarily to high occupancy rates in newly constructed or redeveloped space placed into service and properties acquired during the year. Occupancy of our Same Office Properties was 90.9% at December 31, 2015, up slightly from 90.6% at December 31, 2014. With regard to our segment occupancy trends, including changes from December 31, 2014 to December 31, 2015:

• Fort Meade/BW Corridor: Occupancy increased due in large part to a fully-occupied, newly constructed property placed into service and occupancy of previously vacated space in connection with new leases. We renewed 77.1% of the square footage of our scheduled lease expirations for the year in this segment. Fort Meade continues to be among the strongest demand drivers of our Defense/IT Locations;

• Northern Virginia: Occupancy increased due primarily to a property acquired and a newly constructed property placed in service, each of which were fully occupied. Certain of our submarkets in this segment are experiencing weak market conditions, including surplus supply for space. While ten of our 13 properties in this segment had a weighted average occupancy rate of 98.0% as of December 31, 2015, the other three properties’ weighted average occupancy rate was 43.5%. However, only 73,000, or 4%, of the segment’s square feet had scheduled lease expirations in 2016;

• Navy Support Locations: Occupancy decreased due primarily to our renewal of 58.7% of the square footage of our scheduled lease expirations for the year and placing into service a vacant redeveloped building. As in Northern Virginia, we are also experiencing weak demand in each of our three submarkets comprising this segment, which is creating downward pressure on rental rates. In addition, 208,000, or 16.5%, of the segment’s square feet had scheduled lease expirations in 2016; and

• Redstone Arsenal: Occupancy increased due primarily to occupancy commencing on a previously vacant 62,000 square foot property and a fully-occupied, newly constructed property placed into service.

In 2015, we completed 2.5 million square feet of leasing, including 735,000 square feet of construction and redevelopment space. Our construction and redevelopment leasing was highlighted by four data center shells leased in Northern Virginia totaling 597,000 square feet and 71,000 square feet leased in a property in the Fort Meade/BW Corridor segment. As of December 31, 2015, we had 1.3 million square feet under construction that were 65% leased and 156,000 under redevelopment that were 8% leased.

In 2015, we renewed leases on 1.3 million square feet, representing 70.6% of the square footage of our lease expirations (including the effect of early renewals). The annualized rents of these renewals (totaling $26.72 per square foot) decreased on average by approximately 2.6% and the revenue under GAAP (totaling $27.06 per square foot) increased on average by approximately 6.5% relative to the leases previously in place for the space. The renewed leases had a weighted average lease term of approximately 4.3 years and the average estimated tenant improvements and lease costs associated with completing the leasing was approximately $12.58 per square foot.

In 2015, we also completed 515,000 square feet in other leasing, consisting primarily of space previously leased by us to tenants that was subsequently vacated (also referred to as re-tenanted space). The annualized rents of this other leasing totaled $25.38 per square foot and the revenue under GAAP totaled $25.86 per square foot; these leases had a weighted average lease term of approximately 6.3 years and the average estimated tenant improvements and lease costs associated with completing this leasing was approximately $43.49 per square foot.

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Our weighted average lease term for office properties at December 31, 2015 was approximately 4.9 years. The table below sets forth as of December 31, 2015 our scheduled lease expirations of office properties by region in terms of percentage of annualized rental revenue:

	Expiration of Annualized Rental
	Revenue of Office Properties
	2016		2017		2018		2019		2020		Thereafter		Total
Defense/ IT Locations
Fort Meade/BW Corridor	5.9	%	8.7	%	6.9	%	9.5	%	7.8	%	10.8	%	49.6	%
Northern Virginia Defense/IT	0.3	%	1.5	%	2.2	%	2.6	%	0.7	%	3.0	%	10.3	%
Lackland Air Force Base	0.0	%	0.0	%	0.0	%	0.0	%	1.9	%	6.4	%	8.3	%
Navy Support Locations	1.0	%	0.3	%	1.0	%	0.2	%	1.4	%	1.3	%	5.2	%
Redstone Arsenal	0.0	%	0.0	%	1.3	%	0.3	%	0.6	%	0.5	%	2.7	%
Data Center Shells	0.0	%	0.0	%	0.5	%	0.0	%	0.0	%	4.2	%	4.7	%
Regional Office	1.1	%	1.1	%	2.9	%	1.3	%	2.0	%	9.4	%	17.8	%
Other	0.1	%	0.1	%	0.1	%	0.3	%	0.3	%	0.5	%	1.4	%
Total	8.4	%	11.7	%	14.9	%	14.2	%	14.7	%	36.1	%	100.0	%

With regard to leases expiring in 2016, we believe that the weighted average annualized rental revenue per occupied square foot for such leases at December 31, 2015 was, on average, approximately 2% to 3% higher than estimated current market rents for the related space, with specific results varying by segment.

The leasing statistics set forth above assume no exercise of any early termination rights. Most of the leases with our largest tenant, the United States Government, provide for consecutive one-year terms; all of the leasing statistics set forth above assume that the United States Government will remain in the space that they lease through the end of the respective arrangements, without ending consecutive one-year leases prematurely.

Wholesale Data Center Property

We completed development of our 19.25 megawatt wholesale data center in 2015 and, in February 2015, leased 11.25 megawatts with occupancy that commenced in stages. The center became 100% operational during the period. As of December 31, 2015, 17.8 of the center’s megawatts were leased to tenants with further expansion rights of up to a combined 18.9 megawatts.

Results of Operations

We evaluate the operating performance of our properties using NOI from real estate operations, our segment performance measure derived by subtracting property operating expenses from revenues from real estate operations.  We view our NOI from real estate operations as comprising the following primary categories of operating properties:

• office properties owned and 100% operational throughout the two years being compared, excluding properties held for future disposition.  We define these as changes from “Same Office Properties.” For further discussion of the concept of “operational,” you should refer to the section of Note 2 of the consolidated financial statements entitled “Properties”;

• office properties acquired during the two years being compared;

• constructed or redeveloped office properties placed into service that were not 100% operational throughout the two years being compared;

• our wholesale data center;

• properties held for sale as of December 31, 2015; and

• property dispositions.

 In addition to owning properties, we provide construction management and other services. The primary manner in which we evaluate the operating performance of our construction management and other service activities is through a measure we define as NOI from service operations, which is based on the net of the revenues and expenses from these activities.  The revenues and expenses from these activities consist primarily of subcontracted costs that are reimbursed to us by customers along with a management fee.  The operating margins from these activities are small relative to the revenue.  We believe NOI from service operations is a useful measure in assessing both our level of activity and our profitability in conducting such operations.

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We believe that operating income, as reported on our consolidated statements of operations, is the most directly comparable GAAP measure for both NOI from real estate operations and NOI from service operations.  Since both of these measures exclude certain items includable in operating income, reliance on these measures has limitations; management compensates for these limitations by using the measures simply as supplemental measures that are considered alongside other GAAP and non-GAAP measures.

The table below reconciles NOI from real estate operations and NOI from service operations to operating income reported on the consolidated statements of operations of COPT and subsidiaries:

		For the Years Ended December 31,
		2015			2014			2013
	(in thousands)
NOI from real estate operations		$	324,580		$	299,912		$	317,929
NOI from service operations		3,706			6,690			3,488
NOI from discontinued operations		(10		)	(121		)	(24,131		)
Depreciation and amortization associated with real estate operations		(140,025		)	(136,086		)	(113,214		)
Impairment losses		(23,289		)	(1,416		)	(5,857		)
General, administrative and leasing expenses		(31,361		)	(31,794		)	(30,869		)
Business development expenses and land carry costs		(13,507		)	(5,573		)	(5,436		)
Operating income		$	120,094		$	131,612		$	141,910

Comparison of the Year Ended December 31, 2015 to the Year Ended December 31, 2014
	For the Years Ended December 31,
	2015			2014			Variance
	(in thousands)
Revenues
Revenues from real estate operations	$	519,064		$	479,725		$	39,339
Construction contract and other service revenues	106,402			106,748			(346		)
Total revenues	625,466			586,473			38,993
Expenses
Property operating expenses	194,494			179,934			14,560
Depreciation and amortization associated with real estate operations	140,025			136,086			3,939
Construction contract and other service expenses	102,696			100,058			2,638
Impairment losses	23,289			1,416			21,873
General, administrative and leasing expenses	31,361			31,794			(433		)
Business development expenses and land carry costs	13,507			5,573			7,934
Total operating expenses	505,372			454,861			50,511
Operating income	120,094			131,612			(11,518		)
Interest expense	(89,074		)	(92,393		)	3,319
Interest and other income	4,517			4,923			(406		)
Gain (loss) on early extinguishment of debt	85,275			(9,552		)	94,827
Equity in income of unconsolidated entities	62			229			(167		)
Income tax expense	(199		)	(310		)	111
Income from continuing operations	120,675			34,509			86,166
Discontinued operations	156			26			130
Gain on sales of real estate, net of income taxes	68,047			10,671			57,376
Net income	$	188,878		$	45,206		$	143,672

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NOI from Real Estate Operations

	For the Years Ended December 31,
	2015			2014			Variance
	(Dollars in thousands, except per square foot data)
Revenues
Same Office Properties revenues
Rental revenue, excluding lease termination revenue	$	321,803		$	321,606		$	197
Lease termination revenue	2,366			1,618			748
Tenant recoveries and other real estate operations revenue	85,003			83,936			1,067
Same Office Properties total revenues	409,172			407,160			2,012
Constructed and redeveloped properties placed in service	31,553			9,967			21,586
Acquired office properties	20,176			—			20,176
Wholesale data center	19,032			10,430			8,602
Properties held for sale	12,692			12,022			670
Dispositions	25,763			38,851			(13,088		)
Other	680			1,281			(601		)
	519,068			479,711			39,357
Property operating expenses
Same Office Properties	152,571			149,417			3,154
Constructed and redeveloped properties placed in service	7,662			2,357			5,305
Acquired office properties	8,219			—			8,219
Wholesale data center	10,402			7,286			3,116
Properties held for sale	5,011			4,633			378
Dispositions	10,501			14,397			(3,896		)
Other	122			1,709			(1,587		)
	194,488			179,799			14,689
NOI from real estate operations
Same Office Properties	256,601			257,743			(1,142		)
Constructed and redeveloped properties placed in service	23,891			7,610			16,281
Acquired office properties	11,957			—			11,957
Wholesale data center	8,630			3,144			5,486
Properties held for sale	7,681			7,389			292
Dispositions	15,262			24,454			(9,192		)
Other	558			(428		)	986
	$	324,580		$	299,912		$	24,668
Same Office Properties rent statistics
Average occupancy rate	90.6		%	91.1		%	-0.5		%
Average straight-line rent per occupied square foot (1)	$	24.51		$	24.36		$	0.15

(1)  Includes minimum base rents, net of abatements, and lease incentives on a straight-line basis for the years set forth above.

Our Same Office Properties pool consisted of 145 office properties, comprising 80.3% of our operating office square footage as of December 31, 2015. This pool of properties included the following changes from the pool used for purposes of comparing 2014 and 2013 in our 2014 Annual Report on Form 10-K: the addition of eight properties placed in service and 100% operational by January 1, 2014; and the removal of 15 properties reclassified to held for sale in 2015, seven properties disposed of and one property reclassified as redevelopment in 2015.

Our NOI from constructed and redeveloped office properties placed in service included 14 properties placed in service in 2014 and 2015, and our NOI from acquired office properties included our acquisitions of 250 W. Pratt Street, 2600 Park Tower Drive and 100 and 30 Light Street.

The increase in NOI from our wholesale data center was attributable primarily to higher occupancy in the current period.

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Depreciation and Amortization Expense

The increase in depreciation and amortization expense was attributable primarily to:

• additional expense in 2015 of $10.7 million from our office property acquisitions, $4.4 million from properties placed in service and $3.1 million from our shortening the useful lives of properties that were removed from service for redevelopment; offset in part by

• additional expense in 2014 of $12.9 million from our shortening the useful life of a property that was removed from service for redevelopment.

Impairment Losses

The increase in impairment losses was attributable primarily to the following losses recognized in 2015:

• $12.8 million on land in Colorado Springs, Colorado. We classified some of this land as held for sale in the fourth quarter of 2015, at which time we adjusted the land to its estimated fair value less costs to sell. Due to the impairment loss on the land held for sale, we updated our estimates of fair value for other land owned in Colorado Springs and determined that the carrying value of some of this land exceeded such land’s estimated fair value, which resulted in recognition of an additional impairment loss; and

• $6.6 million on land in Aberdeen, Maryland. After concluding in 2015 that we no longer expected to develop operating properties on the land, we determined that the carrying amount of the land would not likely be recovered from the sale of this property over the likely remaining holding period. Accordingly, we adjusted the land to its estimated fair value;

General, Administrative and Leasing Expenses

We capitalize compensation and indirect costs associated with properties, or portions thereof, undergoing construction, development and redevelopment activities, and also capitalize such costs associated with internal-use software development. We also capitalize compensation costs associated with obtaining new tenant leases or extending existing tenants. Capitalized compensation and indirect costs were as follows:

	For the Years Ended December 31,
	2015		2014
	(in thousands)
Construction, development, redevelopment, capital and tenant improvements	$	7,615	$	7,893
Leasing	1,331		1,461
Total	$	8,946	$	9,354

Business Development Expenses and Land Carry Costs

The increase in business development expenses and land carry costs was due primarily to additional expense in 2015 of $4.1 million in acquisition costs expensed in connection with operating property acquisitions and $1.4 million in demolition costs on properties undergoing redevelopment.

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Interest Expense

The table below sets forth the components of our interest expense included in continuing operations:

	For the Years Ended December 31,
	2015			2014			Variance
	(in thousands)
Interest on Unsecured Senior Notes	$	45,525		$	33,302		$	12,223
Interest on mortgage and other secured loans
Interest, excluding default rate on debt to be extinguished	22,644			37,857			(15,213		)
Interest under default rate on debt extinguished via property conveyance	5,270			5,806			(536		)
Interest on unsecured term loans	9,469			10,282			(813		)
Amortization of deferred financing costs	4,466			4,666			(200		)
Interest expense recognized on interest rate swaps	3,599			2,990			609
Interest on Revolving Credit Facility	1,771			232			1,539
Other interest	3,481			3,323			158
Capitalized interest	(7,151		)	(6,065		)	(1,086		)
Interest expense included in continuing operations	$	89,074		$	92,393		$	(3,319	)

Our average outstanding debt increased from $2.0 billion in 2014 to $2.1 billion in 2015, while our weighted average effective interest rate on debt under generally accepted accounting principles decreased from 4.6% in 2014 to 4.3% in 2015 (or from 4.3% in 2014 to 4.0% in 2015 excluding the effect of the default interest on the debt that we extinguished via property conveyance). The overall decrease in interest expense was due primarily to our fixed rate mortgage loans extinguished in 2014 and 2015 having higher interest rates than our newer debt issuances and borrowings. The changes reflected in the table above also reflect our increased emphasis on unsecured borrowing over mortgage and other secured borrowings. Interest expense for Unsecured Senior Notes increased due to our initial note issuances in May 2014 and June 2015. Capitalized interest increased due primarily to increased volume in active construction and development projects.

Gain (Loss) on Early Extinguishment of Debt

We recognized a gain on early extinguishment of debt of $85.7 million in the current year primarily in connection with our transfer of ownership in two properties serving as collateral for a $150.0 million nonrecourse mortgage loan to the mortgage lender and the removal of the debt obligation and accrued interest from our balance sheet. The loss on early extinguishment of debt in the prior year was attributable primarily to a $9.1 million loss recognized in connection with the defeasance of, and full satisfaction of our obligations with respect to, two secured nonrecourse mortgage loans with a $211.5 million aggregate principal amount.

Gain on Sales of Real Estate, Net

We recognized gain on sales of real estate in 2015 of $64.1 million in connection with office properties dispositions and $4.0 million in connection with land sales. We recognized gain on sales of real estate in 2014 of $5.6 million in connection with a land sale and $5.1 million in connection with dispositions of operating properties.

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Comparison of the Year Ended December 31, 2014 to the Year Ended December 31, 2013

	For the Years Ended December 31,
	2014			2013			Variance
	(in thousands)
Revenues
Revenues from real estate operations	$	479,725		$	460,997		$	18,728
Construction contract and other service revenues	106,748			62,363			44,385
Total revenues	586,473			523,360			63,113
Expenses
Property operating expenses	179,934			167,199			12,735
Depreciation and amortization associated with real estate operations	136,086			113,214			22,872
Construction contract and other service expenses	100,058			58,875			41,183
Impairment losses	1,416			5,857			(4,441		)
General, administrative and leasing expense	31,794			30,869			925
Business development expenses and land carry costs	5,573			5,436			137
Total operating expenses	454,861			381,450			73,411
Operating income	131,612			141,910			(10,298		)
Interest expense	(92,393		)	(82,010		)	(10,383		)
Interest and other income	4,923			3,834			1,089
Loss on early extinguishment of debt	(9,552		)	(27,030		)	17,478
Equity in income of unconsolidated entities	229			2,110			(1,881		)
Income tax expense	(310		)	(1,978		)	1,668
Income from continuing operations	34,509			36,836			(2,327		)
Discontinued operations	26			55,692			(55,666		)
Gain on sales of real estate, net of income taxes	10,671			9,016			1,655
Net income	$	45,206		$	101,544		$	(56,338	)

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NOI from Real Estate Operations

	For the Years Ended December 31,
	2014			2013			Variance
	(Dollars in thousands, except per square foot data)
Revenues
Same Office Properties revenues
Rental revenue, excluding lease termination revenue	$	304,667		$	302,343		$	2,324
Lease termination revenue	1,618			2,270			(652		)
Tenant recoveries and other real estate operations revenue	82,165			73,804			8,361
Same Office Properties	388,450			378,417			10,033
Constructed and redeveloped properties placed in service	28,677			9,890			18,787
Wholesale data center	10,430			7,271			3,159
Properties held for sale	12,022			11,394			628
Dispositions	38,852			86,562			(47,710		)
Other	1,280			5,099			(3,819		)
Other	479,711			498,633			(18,922		)
Property operating expenses
Same Office Properties	143,998			136,023			7,975
Constructed and redeveloped properties placed in service	7,725			2,543			5,182
Wholesale data center	7,286			6,360			926
Properties held for sale	4,633			4,002			631
Dispositions	14,397			30,107			(15,710		)
Other	1,760			1,669			91
	179,799			180,704			(905		)
NOI from real estate operations
Same Office Properties	244,452			242,394			2,058
Constructed and redeveloped properties placed in service	20,952			7,347			13,605
Wholesale data center	3,144			911			2,233
Properties held for sale	7,389			7,392			(3		)
Dispositions	24,455			56,455			(32,000		)
Other	(480		)	3,430			(3,910		)
	$	299,912		$	317,929		$	(18,017	)
Same Office Properties rent statistics
Average occupancy rate	91.7		%	90.4		%	1.3		%
Average straight-line rent per occupied square foot (1)	$	24.80		$	24.90		$	(0.10	)

(1)  Includes minimum base rents, net of abatements, and lease incentives on a straight-line basis for the years set forth above.

The increases in tenant recoveries and other real estate operations revenue and property operating expenses from our Same Office Properties were primarily due to increases in expenses resulting mostly from higher than normal snowfall and lower than normal temperatures in the Mid-Atlantic region in 2014 and an increase in certain other directly reimbursable expenses.

Our Same Office Properties pool consisted of 137 office properties, comprising 79.8% of our operating office square footage as of December 31, 2014. This pool of properties changed from the pool used for purposes of comparing 2014 and 2013 in our 2014 Annual Report on Form 10-K due to the removal of 15 properties reclassified to held for sale in 2015, seven property disposed of and one property reclassified as redevelopment in 2015.

Our NOI from constructed office properties placed in service included 13 properties placed in service in 2013 and 2014.

Depreciation and Amortization Expense

The increase in depreciation and amortization expense was attributable primarily to our shortening of the useful life of a property that was removed from service for redevelopment.

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NOI from Service Operations

	For the Years Ended December 31,
	2014		2013		Variance
	(in thousands)
Construction contract and other service revenues	$	106,748	$	62,363	$	44,385
Construction contract and other service expenses	100,058		58,875		41,183
NOI from service operations	$	6,690	$	3,488	$	3,202

Construction contract and other service revenue and expenses increased due primarily to a higher volume of construction activity in connection with several of our tenants. Construction contract activity is inherently subject to significant variability depending on the volume and nature of projects undertaken by us (primarily on behalf of tenants). Service operations are an ancillary component of our overall operations that typically contribute little operating income relative to our real estate operations.

Impairment Losses

We recognized the impairment losses described below in 2014 and 2013:

• $1.4 million in 2014 primarily in connection with certain of our operating properties in White Marsh, Maryland (included in our Regional Office segment) that we decided to sell and whose carrying amounts exceeded the cash flows from the operations and sales of the properties over the shortened period. These properties were subsequently disposed during the year;

• for certain of our operating properties that served as collateral for a nonrecourse loan, we expected that the cash flows to be generated by the properties would be insufficient to fund debt service requirements on the loan. While we sought to negotiate various alternatives with the lender, on December 23, 2013, we conveyed the properties to the lender to extinguish the loan. We recognized non-cash impairment losses of $11.0 million (all classified as discontinued operations and including $560,000 in exit costs) on these properties in 2013 resulting primarily from the carrying amount of certain of these properties located in Colorado Springs, Colorado (included in our Regional Office and Colorado Defense/IT Locations segments) exceeding their fair value;

• $15.2 million in 2013 (all classified as discontinued operations and including $419,000 in exit costs) in connection with properties and land no longer aligned with our strategy that we sold, mostly in Colorado Springs (operating properties included primarily in our Regional Office and Colorado Defense/IT Locations segments); and

• $5.9 million in 2013 on two properties in White Marsh, Maryland (included in our Regional Office segment) that we concluded no longer met our investment criteria during the year and whose carrying amounts exceeded the cash flows from the operations and sales of the properties over the shortened period.

General, Administrative and Leasing Expenses

Capitalized compensation and indirect costs were as follows:

	For the Years Ended December 31,
	2014		2013
	(in thousands)
Construction, development, redevelopment, capital and tenant improvements	$	7,893	$	8,189
Leasing	1,461		1,408
Total	$	9,354	$	9,597

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Interest Expense

The table below sets forth the components of our interest expense included in continuing operations:

	For the Years Ended December 31,
	2014			2013			Variance
	(in thousands)
Interest on mortgage and other secured loans
Interest, excluding default rate on debt to be extinguished	$	37,857		$	55,105		$	(17,248	)
Interest under default rate on debt extinguished via property conveyance	5,806			—			5,806
Interest on Unsecured Senior Notes	33,302			12,294			21,008
Interest on unsecured term loans	10,282			13,633			(3,351		)
Amortization of deferred financing costs	4,666			5,451			(785		)
Interest expense recognized on interest rate swaps	2,990			2,741			249
Interest on Revolving Credit Facility	232			968			(736		)
Interest on Exchangeable Senior Notes	34			5,824			(5,790		)
Other interest	3,289			3,000			289
Capitalized interest	(6,065		)	(8,785		)	2,720
Total interest expense, net of capitalized interest	92,393			90,231			2,162
Interest expense reclassified to discontinued operations	—			(8,221		)	8,221
Interest expense included in continuing operations	$	92,393		$	82,010		$	10,383

Aside from the incremental additional interest expense associated with the default rate on debt that was extinguished via property conveyance, most of the changes in interest expense reflected above are the result of our emphasis on improving our capital position primarily through the repayment of existing borrowings using proceeds from the property sales, public offerings of equity and new unsecured borrowings. Interest expense for Unsecured Senior Notes increased due to our initial note issuances in May and September 2013 and an additional issuance in May 2014. Interest expense for Exchangeable Senior Notes decreased due to our repayment of almost all of these notes during 2013. Capitalized interest decreased due primarily to our completion of significant construction and development projects that were not immediately offset by new projects.

Loss on Early Extinguishment of Debt

The loss on early extinguishment of debt in 2014 was attributable primarily to a $9.1 million loss recognized in connection with the defeasance of, and full satisfaction of our obligations with respect to, two secured nonrecourse mortgage loans with a $211.5 million aggregate principal amount. The loss on early extinguishment of debt in 2013 was attributable primarily to a $25.9 million loss recognized on our repayment of a $239.4 million principal amount of our 4.25% Exchangeable Senior Notes.

Discontinued Operations

The decrease in discontinued operations was due to a $67.8 million gain on early extinguishment of debt recognized on our conveyance of properties to the lender of a non recourse loan to extinguish the loan in December 2013.

Gain on Sales of Real Estate, Net

In 2014, we recognized gain on sales of real estate of $5.6 million in connection with the disposition of a non-operating property and $5.1 million in connection with dispositions of operating properties in White Marsh, Maryland. For 2013, our gain on sales of real estate, net (excluding amounts in discontinued operations) included a $6.3 million gain on the substantive disposition of our investment in an unconsolidated real estate joint venture and a $2.7 million gain from our disposition of land parcels in White Marsh, Maryland.

Adjusted EBITDA Interest Coverage Ratio and Adjusted EBITDA Fixed Charge Coverage Ratio

Adjusted earnings before interest, taxes, depreciation and amortization (“Adjusted EBITDA”) is net income adjusted for the effects of interest expense, depreciation and amortization, impairment losses, gain on sales of properties, gain or loss on early extinguishment of debt, net gain on unconsolidated entities, operating property acquisition costs, loss on interest rate

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derivatives, income taxes, business development expenses, demolition costs on redevelopment properties and executive transition costs, and excluding the effect of properties serving as collateral for debt which is in default that we extinguished via conveyance of such properties. The adjustment for the effect of properties that served as collateral for debt in default that we extinguished via conveyance of such properties pertains to the periods subsequent to our default on the loan’s payment terms, which was the result of our decision to not support payments on the loan since the estimated fair value of the properties was less than the loan balance. While we continued as the legal owner of the properties during this period up until the transfer ownership, all cash flows produced by them went directly to the lender and we did not fund any debt service shortfalls. In 2015, we changed our methodology for reporting Adjusted EBITDA to exclude the effect of business development expenses since such expenses pertain to the pursuit of new business opportunities rather than normal operations; Adjusted EBITDA for prior periods has been revised to conform with the change in methodology. We believe that Adjusted EBITDA is a useful supplemental measure for assessing our un-levered performance. We believe that net income, as reported on our consolidated statements of operations, is the most directly comparable GAAP measure to Adjusted EBITDA. Adjusted EBITDA excludes items that are included in net income, including some that require cash outlays; we compensate for this limitation by using the measure simply as a supplemental measure that is considered alongside other GAAP and non-GAAP measures. It should not be used as an alternative to net income when evaluating our financial performance or to cash flow from operating, investing and financing activities when evaluating our liquidity or ability to make cash distributions or pay debt service.

We use Adjusted EBITDA to calculate Adjusted EBITDA Interest Coverage Ratio and Adjusted EBITDA Fixed Charge Coverage Ratio. We calculate Adjusted EBITDA interest coverage by dividing Adjusted EBITDA by interest expense on continuing and discontinued operations (excluding amortization of deferred financing costs and amortization of debt discounts and premiums, net of amounts capitalized, gains or losses on interest rate derivatives and interest expense on debt in default which we have extinguished, or expect to extinguish, via conveyance of properties). We calculate Adjusted EBITDA fixed charge coverage ratio by dividing Adjusted EBITDA by the sum of: (1) interest expense on continuing and discontinued operations (excluding amortization of deferred financing costs and amortization of debt discounts and premiums, net of amounts capitalized, gains or losses on interest rate derivatives and interest expense on debt in default to be extinguished via conveyance of properties); (2) scheduled principal amortization on mortgage loans; (3) capitalized interest; (4) dividends on preferred shares; and (5) distributions on preferred units in the Operating Partnership not owned by COPT.

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The tables below set forth the computation of Adjusted EBITDA interest and fixed charge coverage ratios of COPT and subsidiaries and reconciliations of Adjusted EBITDA to net income reported on the COPT’s consolidated statements of operations:

	For the Years Ended December 31,
	2015			2014			2013
	(Dollars in thousands)
Net income	$	188,878		$	45,206		$	101,544
Interest expense (1)	89,074			92,393			90,231
Income tax expense (2)	199			310			1,978
Depreciation and amortization (1)	142,231			138,490			119,773
Impairment losses (1)	23,523			1,419			32,047
(Gain) loss on early extinguishment of debt (1)	(85,655		)	9,668			(40,780		)
Gain on sales of operating properties	(64,062		)	(5,117		)	(9,004		)
Gain on sales of non-operating properties	(3,985		)	(5,578		)	(2,683		)
Net loss on investments in unconsolidated entities included in interest and other income	127			291			206
Business development expenses	4,775			2,680			2,688
Operating property acquisition costs	4,134			—			—
EBITDA from properties conveyed to extinguish debt in default	(768		)	(2,091		)	—
Demolition costs on redevelopment properties	1,396			—			—
Executive transition costs	—			1,056			—
Adjusted EBITDA	$	299,867		$	278,727		$	296,000
Interest expense (1)	$	89,074		$	92,393		$	90,231
Less: Amortization of deferred financing costs	(4,466		)	(4,666		)	(5,451		)
Less: Amortization of net debt discounts and premiums, net of amounts capitalized	(1,166		)	(920		)	(1,015		)
Less: Loss on interest rate derivatives	(386		)	—			—
Less: Interest expense on debt in default extinguished via conveyance of properties	(11,224		)	(12,684		)	—
Denominator for Adjusted EBITDA interest coverage ratio	$	71,832		$	74,123		$	83,765
Scheduled principal amortization	6,728			6,517			9,481
Capitalized interest	7,151			6,065			8,785
Preferred share dividends	14,210			15,939			19,971
Preferred unit distributions	660			660			660
Denominator for Adjusted EBITDA fixed charge coverage ratio	$	100,581		$	103,304		$	122,662
Adjusted EBITDA interest coverage ratio	4.2x			3.8x			3.5x
Adjusted EBITDA fixed charge coverage ratio	3.0x			2.7x			2.4x
(1) Includes amounts included in continuing operations and discontinued operations.
(2) Includes income taxes on continuing operations and gains on sales of real estate.

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Funds from Operations

Funds from operations (“FFO”) is defined as net income (loss) computed using GAAP, excluding gains on sales of, and impairment losses on, previously depreciated operating properties, plus real estate-related depreciation and amortization. When multiple properties consisting of both operating and non-operating properties exist on a single tax parcel, we classify all of the gains on sales of, and impairment losses on, the tax parcel as all being for previously depreciated operating properties when most of the value of the parcel is associated with operating properties on the parcel. We believe that we use the National Association of Real Estate Investment Trusts (“NAREIT”) definition of FFO, although others may interpret the definition differently and, accordingly, our presentation of FFO may differ from those of other REITs.  We believe that FFO is useful to management and investors as a supplemental measure of operating performance because, by excluding gains related to sales of, and impairment losses on, previously depreciated operating properties, net of related tax benefit, and excluding real estate-related depreciation and amortization, FFO can help one compare our operating performance between periods.  In addition, since most equity REITs provide FFO information to the investment community, we believe that FFO is useful to investors as a supplemental measure for comparing our results to those of other equity REITs.  We believe that net income is the most directly comparable GAAP measure to FFO.

Since FFO excludes certain items includable in net income, reliance on the measure has limitations; management compensates for these limitations by using the measure simply as a supplemental measure that is weighed in the balance with other GAAP and non-GAAP measures. FFO is not necessarily an indication of our cash flow available to fund cash needs.  Additionally, it should not be used as an alternative to net income when evaluating our financial performance or to cash flow from operating, investing and financing activities when evaluating our liquidity or ability to make cash distributions or pay debt service.

Basic FFO available to common share and common unit holders (“Basic FFO”) is FFO adjusted to subtract (1) preferred share dividends, (2) issuance costs associated with redeemed preferred shares, (3) income attributable to noncontrolling interests through ownership of preferred units in the Operating Partnership or interests in other consolidated entities not owned by us, (4) depreciation and amortization allocable to noncontrolling interests in other consolidated entities and (5) Basic FFO allocable to restricted shares.  With these adjustments, Basic FFO represents FFO available to common shareholders and common unitholders.  Common units in the Operating Partnership are substantially similar to our common shares and are exchangeable into common shares, subject to certain conditions.  We believe that Basic FFO is useful to investors due to the close correlation of common units to common shares.  We believe that net income is the most directly comparable GAAP measure to Basic FFO.  Basic FFO has essentially the same limitations as FFO; management compensates for these limitations in essentially the same manner as described above for FFO.

Diluted FFO available to common share and common unit holders (“Diluted FFO”) is Basic FFO adjusted to add back any changes in Basic FFO that would result from the assumed conversion of securities that are convertible or exchangeable into common shares.  We believe that Diluted FFO is useful to investors because it is the numerator used to compute Diluted FFO per share, discussed below.  We believe that the numerator for diluted EPS is the most directly comparable GAAP measure to Diluted FFO.  Since Diluted FFO excludes certain items includable in the numerator to diluted EPS, reliance on the measure has limitations; management compensates for these limitations by using the measure simply as a supplemental measure that is weighed in the balance with other GAAP and non-GAAP measures.  Diluted FFO is not necessarily an indication of our cash flow available to fund cash needs.  Additionally, it should not be used as an alternative to net income when evaluating our financial performance or to cash flow from operating, investing and financing activities when evaluating our liquidity or ability to make cash distributions or pay debt service.

Diluted FFO available to common share and common unit holders, as adjusted for comparability is defined as Diluted FFO adjusted to exclude: operating property acquisition costs; gains on sales of, and impairment losses on, properties other than previously depreciated operating properties, net of associated income tax; gain or loss on early extinguishment of debt; FFO associated with properties securing non-recourse debt on which we have defaulted and which we have extinguished, or expect to extinguish, via conveyance of such properties, including property NOI and interest expense (discussed further below); loss on interest rate derivatives; demolition costs on redevelopment properties; executive transition costs; and issuance costs associated with redeemed preferred shares.  We believe that the excluded items are not reflective of normal operations and, as a result, we believe that a measure that excludes these items is a useful supplemental measure in evaluating our operating performance.  The adjustment for FFO associated with properties securing non-recourse debt on which we have defaulted pertains to the periods subsequent to our default on one loan’s payment terms, which was the result of our decision to not support payments on the loan since the estimated fair value of the properties was less than the loan balance. While we continued as the legal owner of the properties during this period up until the transfer ownership, all cash flows produced by them went directly to the lender and we did not fund any debt service shortfalls, which included incremental additional interest under the default rate of $5.3 million in 2015 and $5.8 million in 2014. We believe that the numerator to diluted EPS is the

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most directly comparable GAAP measure to this non-GAAP measure.  This measure has essentially the same limitations as Diluted FFO, as well as the further limitation of not reflecting the effects of the excluded items; we compensate for these limitations in essentially the same manner as described above for Diluted FFO.

Diluted FFO per share is (1) Diluted FFO divided by (2) the sum of the (a) weighted average common shares outstanding during a period, (b) weighted average common units outstanding during a period and (c) weighted average number of potential additional common shares that would have been outstanding during a period if other securities that are convertible or exchangeable into common shares were converted or exchanged.  We believe that Diluted FFO per share is useful to investors because it provides investors with a further context for evaluating our FFO results in the same manner that investors use earnings per share (“EPS”) in evaluating net income available to common shareholders.  In addition, since most equity REITs provide Diluted FFO per share information to the investment community, we believe that Diluted FFO per share is a useful supplemental measure for comparing us to other equity REITs. We believe that diluted EPS is the most directly comparable GAAP measure to Diluted FFO per share. Diluted FFO per share has most of the same limitations as Diluted FFO (described above); management compensates for these limitations in essentially the same manner as described above for Diluted FFO.

Diluted FFO per share, as adjusted for comparability is (1) Diluted FFO, as adjusted for comparability divided by (2) the sum of the (a) weighted average common shares outstanding during a period, (b) weighted average common units outstanding during a period and (c) weighted average number of potential additional common shares that would have been outstanding during a period if other securities that are convertible or exchangeable into common shares were converted or exchanged.  We believe that this measure is useful to investors because it provides investors with a further context for evaluating our FFO results.  We believe that diluted EPS is the most directly comparable GAAP measure to this per share measure.  This measure has most of the same limitations as Diluted FFO (described above) as well as the further limitation of not reflecting the effects of the excluded items; we compensate for these limitations in essentially the same manner as described above for Diluted FFO.

The computations for all of the above measures on a diluted basis assume the conversion of common units in COPLP but do not assume the conversion of other securities that are convertible into common shares if the conversion of those securities would increase per share measures in a given period.

We use measures called payout ratios as supplemental measures of our ability to make distributions to investors based on each of the following: FFO; Diluted FFO; and Diluted FFO, adjusted for comparability. These measures are defined as (1) the sum of (a) dividends on common shares and (b) distributions to holders of interests in COPLP and dividends on convertible preferred shares when such distributions and dividends are included in Diluted FFO divided by either (2) FFO, Diluted FFO or Diluted FFO, adjusted for comparability.

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The tables appearing below and on the following page sets forth the computation of the above stated measures for the years ended December 31, 2011 through 2015 and provides reconciliations to the GAAP measures of COPT and subsidiaries associated with such measures: 

	For the Year Ended December 31,
	2015			2014			2013			2012			2011
	(Dollars and shares in thousands, except per share data)
Net income (loss)	$	188,878		$	45,206		$	101,544		$	20,341		$	(127,576	)
Add: Real estate-related depreciation and amortization	140,025			136,086			117,719			121,937			134,131
Add: Depreciation and amortization on unconsolidated real estate entities allocable to COPT	—			—			—			346			492
Add: Impairment losses on previously depreciated operating properties	4,110			1,370			32,047			70,263			70,512
Less: Gain on sales of previously depreciated operating properties, net of income taxes	(64,062		)	(5,117		)	(9,004		)	(20,928		)	(4,811		)
FFO	268,951			177,545			242,306			191,959			72,748
Less: Noncontrolling interests-preferred units in the Operating Partnership	(660		)	(660		)	(660		)	(660		)	(660		)
Less: FFO allocable to other noncontrolling interests	(3,586		)	(3,216		)	(3,710		)	(1,989		)	(1,887		)
Less: Preferred share dividends	(14,210		)	(15,939		)	(19,971		)	(20,844		)	(16,102		)
Less: Issuance costs associated with redeemed preferred shares	—			(1,769		)	(2,904		)	(1,827		)	—
Basic and diluted FFO allocable to share-based compensation awards	(1,041		)	(665		)	(912		)	(919		)	(1,037		)
Basic and diluted FFO available to common shares and common unit holders	$	249,454		$	155,296		$	214,149		$	165,720		$	53,062
Operating property acquisition costs	4,134			—			—			229			156
Gain on sales of non-operating properties, net of income taxes	(3,985		)	(5,578		)	(2,683		)	(33		)	(2,717		)
Impairment losses (recoveries) on other properties	19,413			49			—			(3,353		)	80,509
Income tax expense (benefit) on impairments on other properties	—			—			—			673			(4,775		)
Valuation allowance on tax asset associated with FFO comparability adjustments	—			—			1,855			—			—
Loss on interest rate derivatives	386			—			—			—			29,805
(Gain) loss on early extinguishment of debt	(85,655		)	9,668			(40,780		)	(793		)	2,023
Issuance costs associated with redeemed preferred shares	—			1,769			2,904			1,827			—
Demolition costs on redevelopment properties	1,396			—			—			—			—
Executive transition costs	—			1,056			—			2,157			—
Add: Negative FFO of properties conveyed to extinguish debt in default	10,456			10,928			—			—			—
Diluted FFO comparability adjustments allocable to share-based compensation awards	225			(78		)	168			—			—
Diluted FFO available to common share and common unit holders, as adjusted for comparability	$	195,824		$	173,110		$	175,613		$	166,427		$	158,063
Weighted average common shares	93,914			88,092			85,167			73,454			69,382
Conversion of weighted average common units	3,692			3,897			3,869			4,235			4,355
Weighted average common shares/units - Basic FFO	97,606			91,989			89,036			77,689			73,737
Dilutive effect of share-based compensation awards	61			171			57			53			111
Weighted average common shares/units - Diluted FFO	97,667			92,160			89,093			77,742			73,848
Diluted FFO per share	$	2.55		$	1.69		$	2.40		$	2.13		$	0.72
Diluted FFO per share, as adjusted for comparability	$	2.01		$	1.88		$	1.97		$	2.14		$	2.14

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	For the Year Ended December 31,
	2015			2014			2013			2012			2011
	(Dollars and shares in thousands, except per share data)
Numerator for diluted EPS	$	169,787		$	22,115		$	70,418		$	(2,163	)	$	(136,567	)
Add: Income allocable to noncontrolling interests-common units in the Operating Partnership	—			1,006			3,283			(87		)	(8,439		)
Add: Real estate-related depreciation and amortization	140,025			136,086			117,719			121,937			134,131
Add: Depreciation and amortization of unconsolidated real estate entities	—			—			—			346			492
Add: Impairment losses on previously depreciated operating properties	4,110			1,370			32,047			70,263			70,512
Add: Numerator for diluted EPS allocable to share-based compensation awards	706			432			414			469			1,037
Less: Depreciation and amortization allocable to noncontrolling interests in other consolidated entities	(750		)	(725		)	(927		)	(633		)	(849		)
Less: Decrease in noncontrolling interests unrelated to earnings	679			794			1,111			(2,565		)	(1,407		)
Less: Basic and diluted FFO allocable to share-based compensation awards	(1,041		)	(665		)	(912		)	(919		)	(1,037		)
Less: Gain on sales of previously depreciated operating properties, net of income taxes	(64,062		)	(5,117		)	(9,004		)	(20,928		)	(4,811		)
Basic and diluted FFO available to common share and common unit holders	$	249,454		$	155,296		$	214,149		$	165,720		$	53,062
Operating property acquisition costs	4,134			—			—			229			156
Gain on sales of non-operating properties, net of income taxes	(3,985		)	(5,578		)	(2,683		)	(33		)	(2,717		)
Impairment losses (recoveries) on other properties	19,413			49			—			(3,353		)	80,509
Income tax expense (benefit) on impairments on other properties	—			—			—			673			(4,775		)
Valuation allowance on tax asset associated with FFO comparability adjustments	—			—			1,855			—			—
Loss on interest rate derivatives	386			—			—			—			29,805
(Gain) loss on early extinguishment of debt	(85,655		)	9,668			(40,780		)	(793		)	2,023
Issuance costs associated with redeemed preferred shares	—			1,769			2,904			1,827			—
Demolition costs on redevelopment properties	1,396			—			—			—			—
Executive transition costs	—			1,056			—			2,157			—
Add: Negative FFO of properties conveyed to extinguish debt in default	10,456			10,928			—			—			—
Diluted FFO comparability adjustments allocable to share-based compensation awards	225			(78		)	168			—			—
Diluted FFO available to common share and common unit holders, as adjusted for comparability	$	195,824		$	173,110		$	175,613		$	166,427		$	158,063
Denominator for diluted EPS	97,667			88,263			85,224			73,454			69,382
Weighted average common units	—			3,897			3,869			4,235			4,355
Anti-dilutive EPS effect of share-based compensation awards	—			—			—			53			111
Denominator for diluted FFO per share measures	97,667			92,160			89,093			77,742			73,848
Dividends on common shares	$	103,998		$	97,944		$	95,246		$	81,720		$	116,717
Common unit distributions	4,046			4,270			4,280			4,617			7,173
Numerator for diluted FFO payout ratio, adjusted for comparability	$	108,044		$	102,214		$	99,526		$	86,337		$	123,890
FFO payout ratio	40.2		%	57.6		%	41.1		%	45.0		%	170.3		%
Diluted FFO payout ratio	43.3		%	65.8		%	46.5		%	52.1		%	233.5		%
Diluted FFO payout ratio, as adjusted for comparability	55.2		%	59.0		%	56.7		%	51.9		%	78.4		%

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Property Additions

The table below sets forth the major components of our additions to properties for 2015 and 2014:

	For the Years Ended December 31,
	2015		2014		Variance
	(in thousands)
Construction, development and redevelopment	$	219,469	$	206,583	$	12,886
Acquisition of operating properties (1)	194,617		—		194,617
Tenant improvements on operating properties (2)	24,999		25,674		(675		)
Capital improvements on operating properties	29,293		22,611		6,682
	$	468,378	$	254,868	$	213,510

(1) Excludes intangible assets and liabilities associated with acquisitions.

(2) Tenant improvement costs incurred on newly-constructed properties are classified in this table as construction, development and redevelopment.

Cash Flows

Net cash flow provided by operating activities increased $10.1 million from 2014 to 2015 due primarily to:

• a $10.7 million increase in cash flow from real estate operations due primarily to properties acquired and placed in service since the prior period;

• a $13.3 million decrease in interest expense paid from 2014 to 2015 due in large part to: a $6.4 million decrease in interest paid on the $150.0 million nonrecourse loan that was in default (as discussed above) since we did not support payments on the loan in 2015; and a $6.0 million decrease due to a change in the timing of interest payments resulting from new debt requiring interest payments semi-annually rather than monthly; and

• an $8.6 million decrease in payments to early extinguish debt due primarily to our defeasance of mortgage loans in 2014; offset in part by

• a $17.3 million decrease in cash flow from construction contract and other services from 2014 to 2015 due in large part to the timing of cash payments and collections on third party construction projects.

Net cash flow used in investing activities increased $97.8 million from 2014 to 2015 due primarily to operating property acquisitions in 2015, offset in part by increased proceeds from sales of properties in 2015.

Net cash flow provided by financing activities in 2015 was $157.8 million and included the following:

• net proceeds from debt borrowings of $259.0 million; and

• net proceeds from the issuance of common shares (or units) of $28.6 million; offset in part by

• dividends and/or distributions to shareholders and/or unitholders of $122.6 million.

Net cash flow used in financing activities in 2014 was $32.5 million and included the following:

• net proceeds from the issuance of common shares (or units) of $150.2 million; offset in part by

• net repayments of borrowings of $9.3 million;

• redemption of preferred shares (or units) of $50.0 million; and

• dividends and/or distributions to shareholders and/or unitholders of $118.1 million.

Liquidity and Capital Resources of COPT

COPLP is the entity through which COPT, the sole general partner of COPLP, conducts almost all of its operations and owns almost all of its assets. COPT issues public equity from time to time, but does not otherwise generate any capital itself or conduct any business itself, other than incurring certain expenses in operating as a public company which are fully reimbursed by COPLP. COPT itself does not hold any indebtedness, and its only material asset is its ownership of partnership interests of COPLP. COPT’s principal funding requirement is the payment of dividends on its common and preferred shares. COPT’s principal source of funding for its dividend payments is distributions it receives from COPLP.

As of December 31, 2015, COPT owned 96.3% of the outstanding common units and 95.5% of the outstanding preferred units in COPLP; the remaining common and preferred units in COPLP were owned by third parties. As the sole general partner of COPLP, COPT has the full, exclusive and complete responsibility for COPLP’s day-to-day management and control.

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The liquidity of COPT is dependent on COPLP’s ability to make sufficient distributions to COPT. The primary cash requirement of COPT is its payment of dividends to its shareholders. COPT also guarantees some of the Operating Partnership’s debt, as discussed further in Note 10 of the notes to consolidated financial statements included elsewhere herein. If the Operating Partnership fails to fulfill certain of its debt requirements, which trigger COPT’s guarantee obligations, then COPT will be required to fulfill its cash payment commitments under such guarantees. However, COPT’s only significant asset is its investment in COPLP.

As discussed further below, we believe the Operating Partnership’s sources of working capital, specifically its cash flow from operations, and borrowings available under its unsecured line of credit, are adequate for it to make its distribution payments to COPT and, in turn, for COPT to make its dividend payments to its shareholders.

COPT’s short-term liquidity requirements consist primarily of funds to pay for future dividends expected to be paid to its shareholders. COPT periodically accesses the public equity markets to raise capital by issuing common and/or preferred shares.

For COPT to maintain its qualification as a REIT, it must pay dividends to its shareholders aggregating annually at least 90% of its ordinary taxable income. As a result of this distribution requirement, it cannot rely on retained earnings to fund its ongoing operations to the same extent that some other companies can. COPT may need to continue to raise capital in the equity markets to fund COPLP’s working capital needs, acquisitions and developments.

Liquidity and Capital Resources of COPLP

Our primary cash requirements are for operating expenses, debt service, development of new properties, improvements to existing properties and acquisitions.  We expect to continue to use cash flow provided by operations as the primary source to meet our short-term capital needs, including property operating expenses, general and administrative expenses, interest expense, scheduled principal amortization of debt, distributions to our security holders and improvements to existing properties.  As of December 31, 2015, we had $60.3 million in cash and cash equivalents; most of this balance was attributable to $57.2 million in cash held from dispositions as of December 31, 2015 that we expect to use in 2016 to fund development activities.

Our senior unsecured debt is currently rated investment grade by the three major rating agencies. We aim to maintain an investment grade rating to enable us to use debt comprised of unsecured, primarily fixed-rate debt (including the effect of interest rate swaps) from public markets and banks. We also use secured nonrecourse debt from institutional lenders and banks, when appropriate. In addition, we periodically access the public equity markets to raise capital by issuing common and/or preferred shares.

We use our Revolving Credit Facility to initially finance much of our investing activities.  We subsequently pay down the facility using proceeds from long-term borrowings, equity issuances and property sales.  The lenders’ aggregate commitment under the facility is $800.0 million, with the ability for us to increase the lenders’ aggregate commitment to $1.3 billion, provided that there is no default under the facility and subject to the approval of the lenders. Amounts available under the facility are computed based on 60% of our unencumbered asset value, as defined in the loan agreement.  The Revolving Credit Facility matures in May 2019, and may be extended by two six-month periods at our option, provided that there is no default under the facility and we pay an extension fee of 0.075% of the total availability of the facility.  As of December 31, 2015, the maximum borrowing capacity under this facility totaled $800.0 million, of which $741.7 million was available.

We believe that our liquidity and capital resources are adequate for our near-term and longer-term requirements without necessitating property sales.  We do, however, expect to raise at least $440 million from sales of properties in 2016 and use the proceeds to repay borrowings and fund development costs.

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The following table summarizes our contractual obligations as of December 31, 2015 (in thousands):

	For the Years Ending December 31,
	2016		2017		2018		2019		2020		Thereafter		Total
Contractual obligations (1)
Debt (2)
Balloon payments due upon maturity	$	201,713	$	—	$	—	$	163,500	$	312,132	$	1,391,229	$	2,068,574
Scheduled principal payments	6,396		3,252		3,400		3,514		3,120		8,974		28,656
Interest on debt (3)	77,100		67,611		67,470		65,673		60,294		157,263		495,411
New construction and redevelopment obligations (4)(5)	69,785		17,225		788		—		—		—		87,798
Third-party construction and development obligations (5)(6)	10,691		—		—		—		—		—		10,691
Capital expenditures for operating properties (5)(7)	32,394		9,028		6,459		—		—		—		47,881
Operating leases (8)	1,189		1,117		1,071		1,049		1,067		86,798		92,291
Other purchase obligations	1,779		938		479		342		94		5		3,637
Total contractual cash obligations	$	401,047	$	99,171	$	79,667	$	234,078	$	376,707	$	1,644,269	$	2,834,939

(1) The contractual obligations set forth in this table exclude property operations contracts that may be terminated with notice of one month or less.

(2) Represents scheduled principal amortization payments and maturities only and therefore excludes a net debt discounts and deferred financing costs of $19.5 million. We expect to repay most of our debt maturing in 2016 using proceeds from a term loan with $150.0 million in available capacity that we entered into in December 2015. As of December 31, 2015, maturities include $43.5 million in 2019 that may be extended to 2020, subject to certain conditions.

(3) Represents interest costs for our outstanding debt as of December 31, 2015 for the terms of such debt.  For variable rate debt, the amounts reflected above used December 31, 2015 interest rates on variable rate debt in computing interest costs for the terms of such debt.

(4) Represents contractual obligations pertaining to new development and redevelopment activities, including land acquisitions. 

(5) Due to the long-term nature of certain construction and development contracts and leases included in these lines, the amounts reported in the table represent our estimate of the timing for the related obligations being payable.

(6)   Represents contractual obligations pertaining to projects for which we are acting as construction manager on behalf of unrelated parties who are our clients.  We expect to be reimbursed in full for these costs by our clients.

(7) Represents contractual obligations pertaining to recurring and nonrecurring capital expenditures for our operating properties.  We expect to finance these costs primarily using cash flow from operations.

(8)  We expect to pay these items using cash flow from operations.

We expect to spend approximately $250.0 million on construction and development costs and approximately $60.0 million on improvements to operating properties (including the commitments set forth in the table above) in 2016.  We expect to fund the construction and development costs using primarily cash on hand and borrowings under our Revolving Credit Facility. We expect to use proceeds from the disposition of properties to repay borrowings under our Revolving Credit Facility. We expect to fund improvements to existing operating properties using cash flow from operations.

Certain of our debt instruments require that we comply with a number of restrictive financial covenants, including maximum leverage ratio, unencumbered leverage ratio, minimum net worth, minimum fixed charge coverage, minimum unencumbered interest coverage ratio, minimum debt service and maximum secured indebtedness ratio.  As of December 31, 2015, we were in compliance with these financial covenants.

Off-Balance Sheet Arrangements

We had no material off-balance sheet arrangements during 2015.

Inflation

Most of our tenants are obligated to pay their share of a building’s operating expenses to the extent such expenses exceed amounts established in their leases, which are based on historical expense levels.  Some of our tenants are obligated to pay their full share of a building’s operating expenses.  These arrangements somewhat reduce our exposure to increases in such costs resulting from inflation.

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Recent Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board (“FASB”) issued guidance regarding the recognition of revenue from contracts with customers. Under this guidance, an entity will recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additionally, this guidance requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We are required to adopt this guidance for our annual and interim periods beginning January 1, 2018 using one of two methods: retrospective restatement for each reporting period presented at the time of adoption, or retrospectively with the cumulative effect of initially applying this guidance recognized at the date of initial application. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In January 2015, the FASB issued guidance regarding the presentation of extraordinary and unusual items in statements of operations. This guidance eliminates the concept of extraordinary items. However, the presentation and disclosure requirements for items that are either unusual in nature or infrequent in occurrence remain and will be expanded to include items that are both unusual in nature and infrequent in occurrence. This guidance is effective for periods beginning after December 15, 2015. We expect that the application of this guidance will have no effect on our reported consolidated financial statements.

In February 2015, the FASB issued guidance regarding amendments to the consolidation analysis. This guidance amends the criteria for determining which entities are considered variable interest entities (“VIE”), amends the criteria for determining if a service provider possesses a variable interest in a VIE and ends the deferral granted to investment companies for application of the VIE consolidation model. This guidance is effective for annual periods, and interim periods therein, beginning after December 15, 2015. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In April 2015, the FASB issued guidance that changes the presentation of debt issuance costs in financial statements. This guidance requires an entity to present such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset. Amortization of the costs will continue to be reported as interest expense. This guidance was further updated in August 2015 with respect to debt issuance costs of line-of-credit arrangements to note that it will be permissible for an entity to defer and present debt issuance costs as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of a line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. This guidance is effective for annual reporting periods beginning after December 15, 2016. Early adoption is permitted. We early adopted this guidance in December 2015 and it was applied retrospectively to each prior period presented. The application of this guidance did not materially affect our consolidated financial statements.

In September 2015, the FASB issued guidance that eliminates the requirement to restate prior period financial statements for measurement period adjustments following a business combination.  The guidance requires that the cumulative impact of a measurement period adjustment (including the impact on prior periods) be recognized in the reporting period in which the adjustment is identified. The prior period impact of the adjustment should be either presented separately on the face of the statement of operations or disclosed in the notes. This guidance is effective for annual reporting periods beginning after December 15, 2015.  This guidance will be applied prospectively for measurement period adjustments that occur after the effective date.  We expect that the application of this guidance will not materially affect our consolidated financial statements.

Item 7A.Quantitative and Qualitative Disclosures about Market Risk

We are exposed to certain market risks, one of the most predominant of which is a change in interest rates.  Increases in interest rates can result in increased interest expense under our Revolving Credit Facility and other variable rate debt.  Increases in interest rates can also result in increased interest expense when our fixed rate debt matures and needs to be refinanced.

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The following table sets forth as of December 31, 2015 our debt obligations and weighted average interest rates on debt maturing each year (dollars in thousands):

	For the Years Ending December 31,
	2016			2017			2018			2019			2020			Thereafter			Total
Debt:
Fixed rate debt (1)	$	171,728		$	2,883		$	3,017		$	3,118		$	2,814		$	1,300,203		$	1,483,763
Weighted average interest rate	7.19		%	4.49		%	4.52		%	4.51		%	4.01		%	4.31		%	4.65		%
Variable rate debt (2)	$	36,381		$	369		$	383		$	163,896		$	312,438		$	100,000		$	613,467
Weighted average interest rate (3)	2.24		%	2.09		%	2.09		%	2.14		%	1.67		%	2.23		%	1.92		%

(1)   Represents principal maturities only and therefore excludes net debt discounts and deferred financing costs of $19.5 million.

(2)  As of December 31, 2015, maturities include $43.5 million in 2019 that may be extended to 2020, subject to certain conditions.

(3)  The amounts reflected above used December 31, 2015 interest rates on variable rate debt.

The fair value of our debt was $2.1 billion as of December 31, 2015 and $1.9 billion as of December 31, 2014.  If interest rates had been 1% lower, the fair value of our fixed-rate debt would have increased by approximately $112 million as of December 31, 2015 and $86 million as of December 31, 2014.

The following table sets forth information pertaining to interest rate swap contracts in place as of December 31, 2015 and 2014 and their respective fair values (dollars in thousands):

								Fair Value at
Notional						Effective	Expiration	December 31,
Amount			Fixed Rate		Floating Rate Index	Date	Date	2015			2014
$	100,000		0.8055	%	One-Month LIBOR	9/2/2014	9/1/2016	$	(148	)	$	(317	)
100,000			0.8100	%	One-Month LIBOR	9/2/2014	9/1/2016	(151		)	(324		)
100,000			1.6730	%	One-Month LIBOR	9/1/2015	8/1/2019	(1,217		)	239
100,000			1.7300	%	One-Month LIBOR	9/1/2015	8/1/2019	(1,429		)	35
13,941		(1)	1.3900	%	One-Month LIBOR	10/13/2015	10/1/2020	53			—
100,000			1.9013	%	One-Month LIBOR	9/1/2016	12/1/2022	(138		)	—
100,000			1.9050	%	One-Month LIBOR	9/1/2016	12/1/2022	(45		)	—
50,000			1.9079	%	One-Month LIBOR	9/1/2016	12/1/2022	(32		)	—
36,200			3.8300	%	One-Month LIBOR + 2.25%	11/2/2010	11/2/2015	—			(400		)
100,000			0.8320	%	One-Month LIBOR	1/3/2012	9/1/2015	—			(407		)
100,000			0.8320	%	One-Month LIBOR	1/3/2012	9/1/2015	—			(407		)
								$	(3,107	)	$	(1,581	)

(1) The notional amount of this instrument is scheduled to amortize to $12.1 million.

Based on our variable-rate debt balances, including the effect of interest rate swap contracts, our interest expense would have increased by $2.5 million in 2015 and $1.9 million in 2014 if short-term interest rates were 1% higher.  Interest expense in 2015 was more sensitive to a change in interest rates than 2014 due primarily to our having a higher average variable-rate debt balance in 2015.

Item 8.Financial Statements and Supplementary Data

This item is included in a separate section at the end of this report beginning on page F-1.

Item 9. Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A. Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) as of December 31, 2015. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of December 31, 2015 were functioning effectively to provide reasonable assurance that

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the information required to be disclosed by us in reports filed or submitted under the Securities Exchange Act of 1934, as amended is (i) recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms, and (ii) accumulated and communicated to our management, including our principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

I. Internal Control Over Financial Reporting

COPT

(a)    Management’s Annual Report on Internal Control Over Financial Reporting

Management’s Annual Report on Internal Control Over Financial Reporting is included in a separate section at the end of this report on page F-2.

(b)    Report of Independent Registered Public Accounting Firm

The Report of Independent Registered Public Accounting Firm is included in a separate section at the end of this report on page F-4.

(c)    Change in Internal Control over Financial Reporting

No change in the Company’s internal control over financial reporting occurred during the most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.

COPLP

(a)    Management’s Annual Report on Internal Control Over Financial Reporting

Management’s Annual Report on Internal Control Over Financial Reporting is included in a separate section at the end of this report on page F-3.

(b)    Report of Independent Registered Public Accounting Firm

The Report of Independent Registered Public Accounting Firm is included in a separate section at the end of this report on page F-5.

(c)    Change in Internal Control over Financial Reporting

No change in the Operating Partnership’s internal control over financial reporting occurred during the most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, its internal control over financial reporting.

Item 9B. Other Information

None.

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PART III

Items 10, 11, 12, 13 & 14. Directors, Executive Officers and Corporate Governance; Executive Compensation; Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters; Certain Relationships and Related Transactions, and Director Independence; and Principal Accountant Fees and Services

For the information required by Item 10, Item 11, Item 12, Item 13 and Item 14, you should refer to COPT’s definitive proxy statement relating to the 2015 Annual Meeting of COPT’s Shareholders to be filed with the Securities and Exchange Commission no later than 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

PART IV

Item 15. Exhibits and Financial Statement Schedules

(a) The following documents are filed as exhibits to this Form 10-K:

1. Financial Statements. See “Index to consolidated financial statements” on page F-1 of this Annual Report on Form 10-K.

2. Financial Statement Schedules. See “Index to consolidated financial statements” on page F-1 of this Annual Report on Form 10-K.

3. See section below entitled “Exhibits.”

(b) Exhibits. Refer to the Exhibit Index that follows. Unless otherwise noted, the file number of all documents incorporated by reference is 1-14023.

EXHIBIT NO.	DESCRIPTION
3.1.1	Amended and Restated Declaration of Trust of Registrant (filed with the Registrant’s Registration Statement on Form S-4 (Commission File No. 333-45649) and incorporated herein by reference).
3.1.2	Articles of Amendment of Amended and Restated Declaration of Trust (filed on March 22, 2002 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2001 and incorporated herein by reference).
3.1.3	Articles of Amendment of Amended and Restated Declaration of Trust (filed with the Company’s Current Report on Form 8-K on December 29, 2004 and incorporated herein by reference).
3.1.4	Articles Supplementary of Corporate Office Properties Trust relating to the Series G Cumulative Redeemable Preferred Shares, dated August 6, 2003 (filed with the Registrant’s Registration Statement on Form 8-A on August 7, 2003 and incorporated herein by reference).
3.1.5	Articles Supplementary of Corporate Office Properties Trust relating to the Series H Cumulative Redeemable Preferred Shares, dated December 11, 2003 (filed with the Company’s Current Report on Form 8-K on December 12, 2003 and incorporated herein by reference).
3.1.6	Articles Supplementary of Corporate Office Properties Trust relating to the Series J Cumulative Redeemable Preferred Shares of Beneficial Interest (filed with the Company’s Current Report on Form 8-K dated July 19, 2006 and incorporated herein by reference).
3.1.7	Articles Supplementary of Corporate Office Properties Trust relating to the Series K Cumulative Redeemable Convertible Preferred Shares of Beneficial Interest (filed with the Company’s Current Report on Form 8-K dated January 16, 2007 and incorporated herein by reference).
3.1.8	Articles Supplementary of Corporate Office Properties Trust relating to the Series L Cumulative Preferred Shares of Beneficial Interest (filed with the Company’s Current Report on Form 8-K dated June 25, 2012 and incorporated herein by reference).
3.1.9	Articles of Amendment of Amended and Restated Declaration of Trust (filed with the Company’s Current Report on Form 8-K dated May 28, 2008 and incorporated herein by reference).
3.1.10	Articles of Amendment of Amended and Restated Declaration of Trust (filed with the Company’s Current Report on Form 8-K dated May 19, 2010 and incorporated herein by reference).
3.1.11	Articles of Amendment of Amended and Restated Declaration of Trust (filed with the Company’s Current Report on Form 8-K dated June 19, 2012 and incorporated herein by reference).
3.1.12	Articles Supplementary filed with the State Department of Assessments and Taxation of Maryland on September 22, 2014 (filed with the Company’s Current Report on Form 8-K dated September 24, 2014 and incorporated herein by reference).

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EXHIBIT NO.	DESCRIPTION
3.2.1	Bylaws of the Registrant, as amended and restated on December 3, 2009 (filed with the Company’s Current Report on Form 8-K dated December 9, 2009 and incorporated herein by reference).
3.2.2	First Amendment to Amended and Restated Bylaws (filed with the Company’s Current Report on Form 8-K dated December 18, 2012 and incorporated herein by reference).
3.3	Form of certificate for the Registrant's Common Shares of Beneficial Interest, $0.01 par value per share (filed with the Registrant's Registration Statement on Form S-4 (Commission File No. 333-45649) and incorporated herein by reference).
10.1.1	Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 7, 1999 (filed on March 16, 2000 with the Company’s Annual Report on Form 10-K for the year ended December 31, 1999 and incorporated herein by reference).
10.1.2	First Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 21, 1999 (filed on March 16, 2000 with the Company’s Annual Report on Form 10-K for the year ended December 31, 1999 and incorporated herein by reference).
10.1.3	Second Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 21, 1999 (filed with the Company’s Post Effective Amendment No. 2 to Form S-3 dated November 1, 2000 (Registration Statement No. 333-71807) and incorporated herein by reference).
10.1.4	Third Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated September 29, 2000 (filed with the Company’s Post Effective Amendment No. 2 to Form S-3 dated November 1, 2000 (Registration Statement No. 333-71807) and incorporated herein by reference).
10.1.5	Fourth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated November 27, 2000 (filed on March 27, 2003 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).
10.1.6	Fifth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated January 25, 2001 (filed on March 27, 2003 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).
10.1.7	Sixth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated April 3, 2001 (filed with the Company’s Current Report on Form 8-K dated April 4, 2001 and incorporated herein by reference).
10.1.8	Seventh Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated August 30, 2001 (filed on March 27, 2003 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).
10.1.9	Eighth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated September 14, 2001 (filed with the Company’s Amended Current Report on Form 8-K dated September 14, 2001 and incorporated herein by reference).
10.1.10	Ninth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated October 16, 2001 (filed on March 27, 2003 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).
10.1.11	Tenth Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 29, 2001 (filed on March 27, 2003 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).
10.1.12	Eleventh Amendment to Second Amended and Restated Limited Partnership Agreement of the Operating Partnership, dated December 15, 2002 (filed on March 27, 2003 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).
10.1.13	Twelfth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated June 2, 2003 (filed on August 12, 2003 with the Registrant’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2003 and incorporated herein by reference).
10.1.14	Thirteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated August 11, 2003 (filed on March 27, 2003 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2002 and incorporated herein by reference).
10.1.15	Fourteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated December 18, 2003 (filed on March 11, 2004 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).
10.1.16	Fifteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated January 31, 2004 (filed on March 11, 2004 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2003 and incorporated herein by reference).

59

EXHIBIT NO.	DESCRIPTION
10.1.17	Sixteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated April 15, 2004 (filed on May 7, 2004 with the Company’s Form 10-Q for the quarter ended March 31, 2004 and incorporated herein by reference).
10.1.18	Seventeenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated September 23, 2004 (filed with the Company’s Current Report on Form 8-K dated September 23, 2004 and incorporated herein by reference).
10.1.19	Eighteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated April 18, 2005 (filed with the Company’s Form 8-K on April 22, 2005 and incorporated herein by reference).
10.1.20	Nineteenth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated July 8, 2005 (filed with the Company’s Current Report on Form 8-K on July 14, 2005 and incorporated herein by reference).
10.1.21	Twentieth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated June 29, 2006 (filed with the Company’s Current Report on Form 8-K dated July 6, 2006 and incorporated herein by reference).
10.1.22	Twenty-First Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated July 20, 2006 (filed with the Company’s Current Report on Form 8-K dated July 26, 2006 and incorporated herein by reference).
10.1.23	Twenty-Second Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated January 9, 2007 (filed with the Company’s Current Report on Form 8-K dated January 16, 2007 and incorporated herein by reference).
10.1.24	Twenty-Third Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated April 6, 2007 (filed with the Company’s Current Report on Form 8-K dated April 12, 2007 and incorporated herein by reference).
10.1.25	Twenty-Fourth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated November 2, 2007 (filed with the Company’s Current Report on Form 8-K dated November 5, 2007 and incorporated herein by reference).
10.1.26	Twenty-Fifth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated December 31, 2008 (filed with the Company’s Current Report on Form 8-K dated January 5, 2009 and incorporated herein by reference).
10.1.27	Twenty-Sixth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated March 4, 2010 (filed with the Company’s Current Report on Form 8-K dated March 10, 2010 and incorporated herein by reference).
10.1.28	Twenty-Seventh Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated February 3, 2011 (filed with the Company’s Current Report on Form 8-K dated February 3, 2011 and incorporated herein by reference).
10.1.29	Twenty-Eighth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated September 15, 2011 (filed with the Company’s Current Report on Form 8-K dated September 16, 2011 and incorporated herein by reference).
10.1.30	Twenty-Ninth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated June 27, 2012 (filed with the Company’s Current Report on Form 8-K dated June 27, 2012 and incorporated herein by reference).
10.1.31	Thirtieth Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated July 16, 2013 (filed with the Company’s Current Report on Form 8-K dated July 19, 2013 and incorporated herein by reference).
10.1.32	Thirty-First Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated September 17, 2013 (filed with the Company’s Current Report on Form 8-K dated September 19, 2013 and incorporated herein by reference).
10.1.33	Thirty-Second Amendment to Second Amended and Restated Limited Partnership Agreement of Corporate Office Properties, L.P., dated April 15, 2015 (filed with the Company’s Current Report on Form 8-K dated April 21, 2015 and incorporated herein by reference).
10.2.1*	Corporate Office Properties Trust 1998 Long Term Incentive Plan (filed with the Registrant’s Registration Statement on Form S-4 (Commission File No. 333-45649) and incorporated herein by reference).
10.2.2*	Amendment No. 1 to Corporate Office Properties Trust 1998 Long Term Incentive Plan (filed on August 13, 1999 with the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 1999 and incorporated herein by reference).

60

EXHIBIT NO.	DESCRIPTION
10.2.3*	Amendment No. 2 to Corporate Office Properties Trust 1998 Long Term Incentive Plan (filed on March 22, 2002 with the Company’s Annual Report on Form 10-K for the year ended December 31, 2001 and incorporated herein by reference).
10.3*	Corporate Office Properties Trust Supplemental Nonqualified Deferred Compensation Plan (filed with the Registrant’s Registration Statement on Form S-8 (Commission File No. 333-87384) and incorporated herein by reference).
10.4*	Separation Agreement and Release, dated February 3, 2015, between Corporate Office Properties Trust, Corporate Office Properties, L.P., and Stephen E. Riffee (filed with the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 and incorporated herein by reference).
10.5.1*	Corporate Office Properties Trust Supplemental Nonqualified Deferred Compensation Plan (filed with the Company’s Current Report on Form 8-K dated December 10, 2008 and incorporated herein by reference).
10.5.2*	First Amendment to the Corporate Office Properties Trust Supplemental Nonqualified Deferred Compensation Plan dated December 4, 2008 (filed with the Company’s Current Report on Form 8-K dated December 10, 2008 and incorporated herein by reference).
10.6.1*	Corporate Office Properties Trust 2008 Omnibus Equity and Incentive Plan (included in Appendix A to the Company’s Definitive Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on April 9, 2008 and incorporated herein by reference).
10.6.2*	Corporate Office Properties Trust Amended and Restated 2008 Omnibus Equity and Incentive Plan (included in Annex A to the Company’s Definitive Proxy Statement on Schedule 14A filed with the Securities and Exchange Commission on March 30, 2010 and incorporated herein by reference).
10.7*	Corporate Office Properties Trust and Corporate Office Properties, L.P. Executive Change in Control and Severance Plan (filed with the Company’s Current Report on Form 8-K dated March 13, 2013 and incorporated herein by reference).
10.8*	Letter Agreement, dated March 8, 2013, between Corporate Office Properties Trust, Corporate Office Properties, L.P., and Roger A. Waesche, Jr. (filed with the Company’s Current Report on Form 8-K dated March 13, 2013 and incorporated herein by reference).
10.9*	Letter Agreement, dated August 28, 2014, between Corporate Office Properties Trust, Corporate Office Properties, L.P., and Wayne H. Lingafelter (filed with the Company’s Current Report on Form 8-K dated September 3, 2014 and incorporated herein by reference).
10.10*	Letter Agreement, dated September 26, 2014, between Corporate Office Properties Trust, Corporate Office Properties, L.P., and Stephen E. Budorick (filed with the Company’s Current Report on Form 8-K dated October 1, 2014 and incorporated herein by reference).
10.11*	Letter Agreement, dated January 19, 2015, between Corporate Office Properties Trust, Corporate Office Properties, L.P., and Anthony Mifsud (filed with the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2015 and incorporated herein by reference).
10.12*	Letter Agreement, dated June 2, 2015, between Corporate Office Properties Trust, Corporate Office Properties, L.P., and Karen M. Singer (filed with the Company’s Current Report on Form 8-K dated June 5, 2015 and incorporated herein by reference).
10.13	Amended and Restated Registration Rights Agreement, dated March 16, 1998, for the benefit of certain shareholders of the Company (filed on August 12, 1998 with the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 1998 and incorporated herein by reference).
10.14	Amended, Restated and Consolidated Credit Agreement, dated as of May 6, 2015, by and among Corporate Office Properties, L.P.; Corporate Office Properties Trust; KeyBank National Association; KeyBanc Capital Markets, Inc.; J.P. Morgan Securities LLC; JPMorgan Chase Bank, N.A.; Bank of America, N.A.; PNC Bank, National Association; Royal Bank of Canada; Wells Fargo Bank, National Association; Barclays Bank PLC; Regions Bank; Citizens Bank of Pennsylvania; and Citibank, N.A. (filed with the Company’s Current Report on Form 8-K dated May 12, 2015 and incorporated herein by reference).
10.15	Indenture, dated as of May 6, 2013, among Corporate Office Properties, L.P., as issuer, Corporate Office Properties Trust, as guarantor, and U.S. Bank National Association, as trustee (filed with the Company’s Current Report on Form 8-K dated May 7, 2013 and incorporated herein by reference).
10.16	Registration Rights Agreement, dated May 6, 2013, among Corporate Office Properties, L.P., Corporate Office Properties Trust, J.P. Morgan Securities LLC and Wells Fargo Securities, LLC (filed with the Company’s Current Report on Form 8-K dated May 7, 2013 and incorporated herein by reference).
10.17	Indenture, dated as of September 16, 2013, by and among Corporate Office Properties, L.P., as issuer, Corporate Office Properties Trust, as guarantor, and U.S. Bank National Association, as trustee (filed with the Company’s Current Report on Form 8-K dated September 19, 2013 and incorporated herein by reference).

61

EXHIBIT NO.	DESCRIPTION
10.18	First Supplemental Indenture, dated September 16, 2013, by and among Corporate Office Properties, L.P., as issuer, Corporate Office Properties Trust, as guarantor, and U.S. Bank National Association, as trustee (filed with the Company’s Current Report on Form 8-K dated September 19, 2013 and incorporated herein by reference).
10.19	Second Supplemental Indenture, dated as of May 14, 2014, among Corporate Office Properties, L.P., as issuer, Corporate Office Properties Trust, as guarantor, and U.S. Bank National Association, as trustee. (filed with the Company’s Current Report on Form 8-K dated May 14, 2014 and incorporated herein by reference).
10.20	Third Supplemental Indenture, dated as of June 29, 2015, among Corporate Office Properties, L.P., as issuer, Corporate Office Properties Trust, as guarantor, and U.S. Bank National Association, as trustee (filed with the Company’s Current Report on Form 8-K dated July 1, 2015 and incorporated herein by reference).
10.21	Term Loan Agreement, dated as of December 17, 2015, by and among Corporate Office Properties, L.P.; Corporate Office Properties Trust; Capital One, National Association, PNC Capital Markets LLC and Regions Capital Markets, a division of Regions Bank, PNC Bank, National Association and Regions Bank (filed herewith).
12.1	COPT’s Statement regarding Computation of Earnings to Combined Fixed Charges and Preferred Share Dividends (filed herewith).
12.2	COPLP’s Statement regarding Computation of Consolidated Ratio of Earnings to Fixed Charges (filed herewith).
21.1	Subsidiaries of COPT (filed herewith).
21.2	Subsidiaries of COPLP (filed herewith).
23.1	COPT’s Consent of Independent Registered Public Accounting Firm (filed herewith).
23.2	COPLP’s Consent of Independent Registered Public Accounting Firm (filed herewith).
31.1	Certification of the Chief Executive Officer of Corporate Office Properties Trust required by Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended (filed herewith).
31.2	Certification of the Chief Financial Officer of Corporate Office Properties Trust required by Rule 13a-14(a) under the Securities Exchange Act of 1934, as amended (filed herewith).
31.3	Certification of the Chief Executive Officer of Corporate Office Properties, L.P. required by Rule 15d-14(a) under the Securities Exchange Act of 1934, as amended (filed herewith).
31.4	Certification of the Chief Financial Officer of Corporate Office Properties, L.P. required by Rule 15d-14(a) under the Securities Exchange Act of 1934, as amended (filed herewith).
32.1	Certification of the Chief Executive Officer of Corporate Office Properties Trust required by Rule 13a-14(b) under the Securities Exchange Act of 1934, as amended. (This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Further, this exhibit shall not be deemed to be incorporated by reference into any filing under the Securities Exchange Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.) (Furnished herewith).
32.2	Certification of the Chief Financial Officer of Corporate Office Properties Trust required by Rule 13a-14(b) under the Securities Exchange Act of 1934, as amended. (This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Further, this exhibit shall not be deemed to be incorporated by reference into any filing under the Securities Exchange Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended). (Furnished herewith).
32.3	Certification of the Chief Executive Officer of Corporate Office Properties, L.P. required by Rule 15d-14(b) under the Securities Exchange Act of 1934, as amended. (This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Further, this exhibit shall not be deemed to be incorporated by reference into any filing under the Securities Exchange Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended.) (Furnished herewith).
32.4	Certification of the Chief Financial Officer of Corporate Office Properties, L.P. required by Rule 15d-14(b) under the Securities Exchange Act of 1934, as amended. (This exhibit shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Further, this exhibit shall not be deemed to be incorporated by reference into any filing under the Securities Exchange Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended). (Furnished herewith).
101.INS	XBRL Instance Document (filed herewith).
101.SCH	XBRL Taxonomy Extension Schema Document (filed herewith).
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document (filed herewith).

62

EXHIBIT NO.	DESCRIPTION
101.LAB	XBRL Extension Labels Linkbase (filed herewith).
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document (filed herewith).
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document (filed herewith).

* - Indicates a compensatory plan or arrangement required to be filed as an exhibit to this Form 10-K.

(c)    Not applicable.

63

SIGNATURES

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

			CORPORATE OFFICE PROPERTIES TRUST
Date:	February 25, 2016	By:	/s/ Roger A. Waesche, Jr.
			Roger A. Waesche, Jr.
			President and Chief Executive Officer
Date:	February 25, 2016	By:	/s/ Anthony Mifsud
			Anthony Mifsud
			Executive Vice President and Chief Financial Officer

64

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

Signatures	Title	Date
/s/ Thomas F. Brady	Chairman of the Board and Trustee	February 25, 2016
(Thomas F. Brady)
/s/ Roger A. Waesche, Jr.	President and Chief Executive Officer and Trustee	February 25, 2016
(Roger A. Waesche, Jr.)
/s/ Anthony Mifsud	Executive Vice President and Chief Financial	February 25, 2016
(Anthony Mifsud)	Officer (Principal Financial Officer)
/s/ Gregory J. Thor	Senior Vice President, Controller and Chief	February 25, 2016
(Gregory J. Thor)	Accounting Officer (Principal Accounting Officer)
/s/ Robert L. Denton	Trustee	February 25, 2016
( Robert L. Denton)
/s/ Philip L. Hawkins	Trustee	February 25, 2016
(Philip L. Hawkins)
/s/ Elizabeth A. Hight	Trustee	February 25, 2016
(Elizabeth A. Hight)
/s/ David M. Jacobstein	Trustee	February 25, 2016
(David M. Jacobstein)
/s/ Steven D. Kesler	Trustee	February 25, 2016
(Steven D. Kesler)
/s/ C. Taylor Pickett	Trustee	February 25, 2016
(C. Taylor Pickett)
/s/ Richard Szafranski	Trustee	February 25, 2016
(Richard Szafranski)

65

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

			CORPORATE OFFICE PROPERTIES, L.P.
			By: Corporate Office Properties Trust,
			its General Partner
Date:	February 25, 2016	By:	/s/ Roger A. Waesche, Jr.
			Roger A. Waesche, Jr.
			President and Chief Executive Officer
Date:	February 25, 2016	By:	/s/ Anthony Mifsud
			Anthony Mifsud
			Executive Vice President and Chief Financial Officer

66

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

Signatures	Title	Date
/s/ Thomas F. Brady	Chairman of the Board and Trustee	February 25, 2016
(Thomas F. Brady)
/s/ Roger A. Waesche, Jr.	President and Chief Executive Officer and Trustee	February 25, 2016
(Roger A. Waesche, Jr.)
/s/ Anthony Mifsud	Executive Vice President and Chief Financial	February 25, 2016
(Anthony Mifsud)	Officer (Principal Financial Officer)
/s/ Gregory J. Thor	Senior Vice President, Controller and Chief	February 25, 2016
(Gregory J. Thor)	Accounting Officer (Principal Accounting Officer)
/s/ Robert L. Denton	Trustee	February 25, 2016
( Robert L. Denton)
/s/ Philip L. Hawkins	Trustee	February 25, 2016
(Philip L. Hawkins)
/s/ Elizabeth A. Hight	Trustee	February 25, 2016
(Elizabeth A. Hight)
/s/ David M. Jacobstein	Trustee	February 25, 2016
(David M. Jacobstein)
/s/ Steven D. Kesler	Trustee	February 25, 2016
(Steven D. Kesler)
/s/ C. Taylor Pickett	Trustee	February 25, 2016
(C. Taylor Pickett)
/s/ Richard Szafranski	Trustee	February 25, 2016
(Richard Szafranski)

67

INDEX TO FINANCIAL STATEMENTS AND SCHEDULE

Management’s Reports of Internal Control Over Financial Reporting
Corporate Office Properties Trust	F-2
Corporate Office Properties, L.P.	F-3
Reports of Independent Registered Public Accounting Firm
Corporate Office Properties Trust	F-4
Corporate Office Properties, L.P.	F-5
Consolidated Financial Statements of Corporate Office Properties Trust
Consolidated Balance Sheets as of December 31, 2015 and 2014	F-6
Consolidated Statements of Operations for the Years Ended December 31, 2015, 2014 and 2013	F-7
Consolidated Statements of Comprehensive Income for the Years Ended December 31, 2015, 2014 and 2013	F-8
Consolidated Statements of Equity for the Years Ended December 31, 2015, 2014 and 2013	F-9
Consolidated Statements of Cash Flows for the Years Ended December 31, 2015, 2014 and 2013	F-10
Consolidated Financial Statements of Corporate Office Properties, L.P.
Consolidated Balance Sheets as of December 31, 2015 and 2014	F-12
Consolidated Statements of Operations for the Years Ended December 31, 2015, 2014 and 2013	F-13
Consolidated Statements of Comprehensive Income for the Years Ended December 31, 2015, 2014 and 2013	F-14
Consolidated Statements of Equity for the Years Ended December 31, 2015, 2014 and 2013	F-15
Consolidated Statements of Cash Flows for the Years Ended December 31, 2015, 2014 and 2013	F-16
Notes to Consolidated Financial Statements	F-18
Financial Statements Schedules
Schedule II - Valuation and Qualifying Accounts	F-58
Schedule III - Real Estate and Accumulated Depreciation as of December 31, 2015	F-59

F-1

Corporate Office Properties Trust Management’s Report On Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting, and for performing an assessment of the effectiveness of internal control over financial reporting as of December 31, 2015. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. Our internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that our receipts and expenditures are being made only in accordance with authorizations of our management and trustees; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on the financial statements. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management performed an assessment of the effectiveness of our internal control over financial reporting as of December 31, 2015 based upon criteria in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). Based on our assessment, management determined that our internal control over financial reporting was effective as of December 31, 2015 based on the criteria in Internal Control-Integrated Framework (2013) issued by the COSO.

The effectiveness of our internal control over financial reporting as of December 31, 2015 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears herein.

F-2

Corporate Office Properties, L.P. Management’s Report On Internal Control Over Financial Reporting

Management is responsible for establishing and maintaining adequate internal control over financial reporting, and for performing an assessment of the effectiveness of internal control over financial reporting as of December 31, 2015. Internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. Our internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of our assets; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that our receipts and expenditures are being made only in accordance with authorizations of our management and trustees; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a material effect on the financial statements. Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

Management performed an assessment of the effectiveness of our internal control over financial reporting as of December 31, 2015 based upon criteria in Internal Control - Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (“COSO”). Based on our assessment, management determined that our internal control over financial reporting was effective as of December 31, 2015 based on the criteria in Internal Control-Integrated Framework (2013) issued by the COSO.

The effectiveness of our internal control over financial reporting as of December 31, 2015 has been audited by PricewaterhouseCoopers LLP, an independent registered public accounting firm, as stated in their report which appears herein.

F-3

Report of Independent Registered Public Accounting Firm

To the Board of Trustees and Shareholders of Corporate Office Properties Trust:

In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material respects, the financial position of Corporate Office Properties Trust and its subsidiaries at December 31, 2015 and December 31, 2014, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2015 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedules listed in the accompanying index present fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for these financial statements and financial statement schedules, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying “Management's Report on Internal Control over Financial Reporting”. Our responsibility is to express opinions on these financial statements, on the financial statement schedules, and on the Company’s internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

As discussed in Note 2 to the consolidated financial statements, the Company adopted accounting standards update (“ASU”) No. 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity”, which changed the criteria for reporting discontinued operations in 2014.

/s/ PricewaterhouseCoopers LLP

Baltimore, Maryland

February 25, 2016

F-4

Report of Independent Registered Public Accounting Firm

To the Board of Trustees and Unitholders of Corporate Office Properties, L.P.:

In our opinion, the consolidated financial statements listed in the accompanying index present fairly, in all material respects, the financial position of Corporate Office Properties, L.P. and its subsidiaries at December 31, 2015 and December 31, 2014, and the results of their operations and their cash flows for each of the three years in the period ended December 31, 2015 in conformity with accounting principles generally accepted in the United States of America. In addition, in our opinion, the financial statement schedules listed in the accompanying index present fairly, in all material respects, the information set forth therein when read in conjunction with the related consolidated financial statements. Also in our opinion, the Company maintained, in all material respects, effective internal control over financial reporting as of December 31, 2015, based on criteria established in Internal Control - Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission (COSO). The Company’s management is responsible for these financial statements and financial statement schedules, for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting, included in the accompanying “Management's Report on Internal Control over Financial Reporting”. Our responsibility is to express opinions on these financial statements, on the financial statement schedules, and on the Company’s internal control over financial reporting based on our integrated audits. We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audits to obtain reasonable assurance about whether the financial statements are free of material misstatement and whether effective internal control over financial reporting was maintained in all material respects. Our audits of the financial statements included examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, assessing the accounting principles used and significant estimates made by management, and evaluating the overall financial statement presentation. Our audit of internal control over financial reporting included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, and testing and evaluating the design and operating effectiveness of internal control based on the assessed risk. Our audits also included performing such other procedures as we considered necessary in the circumstances. We believe that our audits provide a reasonable basis for our opinions.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (i) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (ii) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (iii) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

As discussed in Note 2 to the consolidated financial statements, the Company adopted accounting standards update (“ASU”) No. 2014-08, “Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity”, which changed the criteria for reporting discontinued operations in 2014.

/s/ PricewaterhouseCoopers LLP

Baltimore, Maryland

February 25, 2016

F-5

Corporate Office Properties Trust and Subsidiaries

Consolidated Balance Sheets

(in thousands, except share data)

	December 31,
	2015			2014
Assets
Properties, net:
Operating properties, net	$	2,920,529		$	2,751,488
Projects in development or held for future development	429,219			545,426
Total properties, net	3,349,748			3,296,914
Assets held for sale, net	96,782			14,339
Cash and cash equivalents	60,310			6,077
Restricted cash and marketable securities	7,716			9,069
Accounts receivable (net of allowance for doubtful accounts of $1,525 and $717, respectively)	29,167			30,698
Deferred rent receivable (net of allowance of $1,962 and $1,418, respectively)	105,484			95,910
Intangible assets on real estate acquisitions, net	98,338			43,854
Deferred leasing costs (net of accumulated amortization of $66,364 and $69,998, respectively)	53,868			53,927
Investing receivables	47,875			52,147
Prepaid expenses and other assets, net	60,024			61,301
Total assets	$	3,909,312		$	3,664,236
Liabilities and equity
Liabilities:
Debt, net	$	2,077,752		$	1,914,036
Accounts payable and accrued expenses	91,755			123,035
Rents received in advance and security deposits	37,148			31,011
Dividends and distributions payable	30,178			29,862
Deferred revenue associated with operating leases	19,758			13,031
Interest rate derivatives	3,160			1,855
Other liabilities	13,779			12,105
Total liabilities	2,273,530			2,124,935
Commitments and contingencies (Note 20)
Redeemable noncontrolling interests	19,218			18,417
Equity:
Corporate Office Properties Trust’s shareholders’ equity:
Preferred Shares of beneficial interest at liquidation preference	199,083			199,083
Common Shares of beneficial interest ($0.01 par value; 125,000,000 shares authorized, shares issued and outstanding of 94,531,512 at December 31, 2015 and 93,255,284 at December 31, 2014)	945			933
Additional paid-in capital	2,004,507			1,969,968
Cumulative distributions in excess of net income	(657,172		)	(717,264		)
Accumulated other comprehensive loss	(2,838		)	(1,297		)
Total Corporate Office Properties Trust’s shareholders’ equity	1,544,525			1,451,423
Noncontrolling interests in subsidiaries:
Common units in COPLP	52,359			51,534
Preferred units in COPLP	8,800			8,800
Other consolidated entities	10,880			9,127
Noncontrolling interests in subsidiaries	72,039			69,461
Total equity	1,616,564			1,520,884
Total liabilities, redeemable noncontrolling interest and equity	$	3,909,312		$	3,664,236

See accompanying notes to consolidated financial statements.

F-6

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Operations

(in thousands, except per share data)

	For the Years Ended December 31,
	2015			2014			2013
Revenues
Rental revenue	$	420,340		$	386,396		$	377,611
Tenant recoveries and other real estate operations revenue	98,724			93,329			83,386
Construction contract and other service revenues	106,402			106,748			62,363
Total revenues	625,466			586,473			523,360
Expenses
Property operating expenses	194,494			179,934			167,199
Depreciation and amortization associated with real estate operations	140,025			136,086			113,214
Construction contract and other service expenses	102,696			100,058			58,875
Impairment losses	23,289			1,416			5,857
General, administrative and leasing expenses	31,361			31,794			30,869
Business development expenses and land carry costs	13,507			5,573			5,436
Total operating expenses	505,372			454,861			381,450
Operating income	120,094			131,612			141,910
Interest expense	(89,074		)	(92,393		)	(82,010		)
Interest and other income	4,517			4,923			3,834
Gain (loss) on early extinguishment of debt	85,275			(9,552		)	(27,030		)
Income from continuing operations before equity in income of unconsolidated entities and income taxes	120,812			34,590			36,704
Equity in income of unconsolidated entities	62			229			2,110
Income tax expense	(199		)	(310		)	(1,978		)
Income from continuing operations	120,675			34,509			36,836
Discontinued operations	156			26			55,692
Income before gain on sales of real estate	120,831			34,535			92,528
Gain on sales of real estate, net of income taxes	68,047			10,671			9,016
Net income	188,878			45,206			101,544
Net income attributable to noncontrolling interests:
Common units in COPLP	(6,403		)	(1,006		)	(3,283		)
Preferred units in COPLP	(660		)	(660		)	(660		)
Other consolidated entities	(3,515		)	(3,285		)	(3,894		)
Net income attributable to COPT	178,300			40,255			93,707
Preferred share dividends	(14,210		)	(15,939		)	(19,971		)
Issuance costs associated with redeemed preferred shares	—			(1,769		)	(2,904		)
Net income attributable to COPT common shareholders	$	164,090		$	22,547		$	70,832
Net income attributable to COPT:
Income from continuing operations	$	178,147		$	40,225		$	41,366
Discontinued operations, net	153			30			52,341
Net income attributable to COPT	$	178,300		$	40,255		$	93,707
Basic earnings per common share (1)
Income from continuing operations	$	1.74		$	0.25		$	0.21
Discontinued operations	—			—			0.62
Net income attributable to COPT common shareholders	$	1.74		$	0.25		$	0.83
Diluted earnings per common share (1)
Income from continuing operations	$	1.74		$	0.25		$	0.21
Discontinued operations	—			—			0.62
Net income attributable to COPT common shareholders	$	1.74		$	0.25		$	0.83

(1) Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.

See accompanying notes to consolidated financial statements.

F-7

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Comprehensive Income/Loss

(in thousands)

	For the Years Ended December 31,
	2015			2014			2013
Net income	$	188,878		$	45,206		$	101,544
Other comprehensive (loss) income
Unrealized (losses) gains on interest rate derivatives	(4,739		)	(7,799		)	6,791
Losses on interest rate derivatives included in interest expense	3,599			2,990			2,740
Losses on interest rate derivatives included in loss on early extinguishment of debt	—			38			—
Unrealized equity in other comprehensive (loss) income of equity method investee	(264		)	—			1,070
Realized equity in other comprehensive income of equity method investee	—			—			(1,070		)
Other comprehensive (loss) income	(1,404		)	(4,771		)	9,531
Comprehensive income	187,474			40,435			111,075
Comprehensive income attributable to noncontrolling interests	(10,715		)	(4,957		)	(8,453		)
Comprehensive income attributable to COPT	$	176,759		$	35,478		$	102,622

See accompanying notes to consolidated financial statements.

F-8

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Equity

(Dollars in thousands)

	Preferred Shares			Common Shares		Additional Paid-in Capital			Cumulative Distributions in Excess of Net Income			Accumulated Other Comprehensive Loss			Noncontrolling Interests			Total
Balance at December 31, 2012 (80,952,986 common shares outstanding)	$	333,833		$	809	$	1,653,672		$	(617,455	)	$	(5,435	)	$	71,075		$	1,436,499
Redemption of preferred shares (3,390,000 shares)	(84,750		)	—		2,904			(2,904		)	—			—			(84,750		)
Conversion of common units to common shares (311,343 shares)	—			3		3,994			—			—			(3,997		)	—
Common shares issued to the public (4,485,000 shares)	—			45		117,916			—			—			—			117,961
Common shares issued under at-the-market program (1,500,000 shares)	—			15		38,432			—			—			—			38,447
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units	—			—		(1,296		)	—			—			2,665			1,369
Exercise of share options (39,331 shares)	—			—		779			—			—			—			779
Share-based compensation (105,852 shares issued, net of redemptions)	—			2		7,603			—			—			—			7,605
Redemption of vested equity awards	—			—		(2,002		)	—			—			—			(2,002		)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	—			—		(744		)	—			—			744			—
Comprehensive income	—			—		—			93,707			8,915			7,077			109,699
Dividends	—			—		—			(115,216		)	—			—			(115,216		)
Distributions to owners of common and preferred units in COPLP	—			—		—			—			—			(4,940		)	(4,940		)
Contributions from noncontrolling interests in other consolidated entities	—			—		—			—			—			86			86
Distributions to noncontrolling interest in other consolidated entities	—			—		—			—			—			(1,045		)	(1,045		)
Adjustment to arrive at fair value of redeemable noncontrolling interest	—			—		(7,121		)	—			—			—			(7,121		)
Tax loss from share-based compensation	—			—		(122		)	—			—			—			(122		)
Balance at December 31, 2013 (87,394,512 common shares outstanding)	249,083			874		1,814,015			(641,868		)	3,480			71,665			1,497,249
Redemption of preferred shares (2,000,000 shares)	(50,000		)	—		1,769			(1,769		)	—			—			(50,000		)
Conversion of common units to common shares (140,149 shares)	—			2		1,841			—			—			(1,843		)	—
Common shares issued to the public (5,520,000 shares)	—			55		148,611			—			—			—			148,666
Exercise of share options (62,888 shares)	—			—		1,489			—			—			—			1,489
Share-based compensation (137,735 shares issued, net of redemptions)	—			2		7,048			—			—			—			7,050
Redemption of vested equity awards	—			—		(1,554		)	—			—			—			(1,554		)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	—			—		(3,382		)	—			—			3,382			—
Comprehensive income	—			—		—			40,255			(4,777		)	2,796			38,274
Dividends	—			—		—			(113,882		)	—			—			(113,882		)
Distributions to owners of common and preferred units in COPLP	—			—		—			—			—			(4,929		)	(4,929		)
Contributions from noncontrolling interests in other consolidated entities	—			—		—			—			—			3			3
Distributions to noncontrolling interests in other consolidated entities	—			—		—			—			—			(1,613		)	(1,613		)
Adjustment to arrive at fair value of redeemable noncontrolling interest	—			—		134			—			—			—			134
Tax loss from share-based compensation	—			—		(3		)	—			—			—			(3		)
Balance at December 31, 2014 (93,255,284 common shares outstanding)	199,083			933		1,969,968			(717,264		)	(1,297		)	69,461			1,520,884
Conversion of common units to common shares (160,160 shares)	—			2		2,149			—			—			(2,151		)	—
Common shares issued under at-the-market program (890,241 shares)	—			9		26,526			—			—			—			26,535
Exercise of share options (76,474 shares)	—			—		2,008			—			—			—			2,008
Share-based compensation (149,353 shares issued, net of redemptions)	—			1		7,397			—			—			—			7,398
Redemption of vested equity awards	—			—		(2,462		)	—			—			—			(2,462		)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	—			—		(682		)	—			—			682			—
Comprehensive income	—			—		—			178,300			(1,541		)	8,488			185,247
Dividends	—			—		—			(118,208		)	—			—			(118,208		)
Distributions to owners of common and preferred units in COPLP	—			—		—			—			—			(4,706		)	(4,706		)
Contributions from noncontrolling interests in other consolidated entities	—			—		—			—			—			300			300
Distributions to noncontrolling interests in other consolidated entities	—			—		—			—			—			(35		)	(35		)
Adjustment to arrive at fair value of redeemable noncontrolling interests	—			—		116			—			—			—			116
Tax loss from share-based compensation	—			—		(513		)	—			—			—			(513		)
Balance at December 31, 2015 (94,531,512 common shares outstanding)	$	199,083		$	945	$	2,004,507		$	(657,172	)	$	(2,838	)	$	72,039		$	1,616,564

See accompanying notes to consolidated financial statements.

F-9

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Cash Flows

(in thousands)

	For the Years Ended December 31,
	2015			2014			2013
Cash flows from operating activities
Revenues from real estate operations received	$	501,779		$	479,605		$	482,763
Construction contract and other service revenues received	117,107			89,180			63,647
Property operating expenses paid	(190,281		)	(178,803		)	(176,243		)
Construction contract and other service expenses paid	(124,481		)	(79,271		)	(63,853		)
General, administrative, leasing, business development and land carry costs paid	(38,113		)	(29,521		)	(28,022		)
Interest expense paid	(65,816		)	(79,095		)	(81,575		)
Previously accreted interest expense paid	—			—			(11,116		)
Exit costs on property dispositions	—			—			(979		)
Payments in connection with early extinguishment of debt	(373		)	(9,017		)	(27,909		)
Interest and other income received	4,194			607			2,260
Income taxes (paid) refunded	(8		)	200			6
Net cash provided by operating activities	204,008			193,885			158,979
Cash flows from investing activities
Acquisitions of operating properties and related intangible assets	(202,866		)	—			—
Construction, development and redevelopment	(234,346		)	(200,385		)	(201,808		)
Tenant improvements on operating properties	(29,413		)	(27,037		)	(21,950		)
Other capital improvements on operating properties	(23,147		)	(28,720		)	(23,940		)
Proceeds from dispositions of properties	193,735			57,782			148,569
Investing receivables funded	(22		)	(3,731		)	(14,077		)
Investing receivables payments received	5,114			10,279			144
Leasing costs paid	(13,710		)	(16,234		)	(14,429		)
Decrease in restricted cash associated with investing activities	1,455			1,137			8,178
Other	(4,332		)	(2,780		)	(477		)
Net cash used in investing activities	(307,532		)	(209,689		)	(119,790		)
Cash flows from financing activities
Proceeds from debt
Revolving Credit Facility	522,000			232,000			504,000
Unsecured senior notes	296,580			297,342			592,413
Other debt proceeds	164,000			11,569			94,049
Repayments of debt
Revolving Credit Facility	(561,500		)	(149,000		)	(504,000		)
Scheduled principal amortization	(6,728		)	(6,517		)	(9,481		)
Other debt repayments	(155,307		)	(394,653		)	(612,093		)
Deferred financing costs paid	(7,522		)	(708		)	(9,361		)
Net proceeds from issuance of common shares	28,567			150,174			157,444
Redemption of preferred shares	—			(50,000		)	(84,750		)
Common share dividends paid	(103,638		)	(96,330		)	(93,474		)
Preferred share dividends paid	(14,210		)	(16,731		)	(21,335		)
Distributions paid to noncontrolling interests in COPLP	(4,752		)	(5,008		)	(4,958		)
Redemption of vested equity awards	(2,462		)	(1,554		)	(2,002		)
Other	2,729			(3,076		)	(1,862		)
Net cash provided by (used in) financing activities	157,757			(32,492		)	4,590
Net increase (decrease) in cash and cash equivalents	54,233			(48,296		)	43,779
Cash and cash equivalents
Beginning of period	6,077			54,373			10,594
End of period	$	60,310		$	6,077		$	54,373

See accompanying notes to consolidated financial statements.

F-10

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Cash Flows (continued)

(in thousands)

	For the Years Ended December 31,
	2015			2014			2013
Reconciliation of net income to net cash provided by operating activities:
Net income	$	188,878		$	45,206		$	101,544
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and other amortization	142,231			138,490			119,773
Impairment losses	23,523			1,419			31,068
Settlement of previously accreted interest expense	—			—			(11,116		)
Amortization of deferred financing costs	4,466			4,666			5,451
Increase in deferred rent receivable	(14,969		)	(3,520		)	(5,196		)
Amortization of net debt discounts	1,122			921			1,159
Gain on sales of real estate	(68,047		)	(10,695		)	(11,687		)
Share-based compensation	6,574			6,164			6,530
(Gain) loss on early extinguishment of debt	(86,028		)	651			(68,689		)
Other	528			(3,242		)	(3,093		)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	1,331			(2,011		)	(11,698		)
(Increase) decrease in restricted cash and marketable securities	(1,241		)	1,352			576
Decrease (increase) in prepaid expenses and other assets, net	2,853			(10,126		)	(3,764		)
(Decrease) increase in accounts payable, accrued expenses and other liabilities	(3,620		)	25,091			3,960
Increase (decrease) in rents received in advance and security deposits	6,407			(481		)	4,161
Net cash provided by operating activities	$	204,008		$	193,885		$	158,979
Supplemental schedule of non-cash investing and financing activities:
(Decrease) increase in accrued capital improvements, leasing and other investing activity costs	$	(14,797	)	$	(3,779	)	$	2,947
Debt assumed on acquisition of operating property	$	55,490		$	—		$	—
Other liabilities assumed on acquisition of operating properties	$	5,179		$	—		$	—
Decrease in property in connection with transfer of property in settlement of debt	$	(82,738	)	$	—		$	(73,780	)
Decrease in debt in connection with transfer of property in settlement of debt	$	(150,000	)	$	—		$	(146,500	)
Increase in property and redeemable noncontrolling interests in connection with property contribution by a redeemable noncontrolling interest in a joint venture	$	1,415		$	—		$	—
(Decrease) increase in fair value of derivatives applied to accumulated other comprehensive income (loss) and noncontrolling interests	$	(1,140	)	$	(4,866	)	$	9,470
Equity in other comprehensive loss of an equity method investee	$	(264	)	$	—		$	—
Dividends/distribution payable	$	30,178		$	29,862		$	29,080
COPLP common units issued to acquire property and noncontrolling interest in other consolidated entity	$	—		$	—		$	5,194
Decrease in noncontrolling interests and increase in shareholders’ equity in connection with the conversion of common units into common shares	$	2,151		$	1,843		$	3,997
Adjustments to noncontrolling interests resulting from changes in COPLP ownership	$	682		$	3,382		$	744
(Decrease) increase in redeemable noncontrolling interest and (increase) decrease in equity to carry redeemable noncontrolling interests at fair value	$	(116	)	$	(134	)	$	7,121

See accompanying notes to consolidated financial statements.

F-11

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Balance Sheets

(in thousands, except unit data)

	December 31,
	2015			2014
Assets
Properties, net:
Operating properties, net	$	2,920,529		$	2,751,488
Projects in development or held for future development	429,219			545,426
Total properties, net	3,349,748			3,296,914
Assets held for sale, net	96,782			14,339
Cash and cash equivalents	60,310			6,077
Restricted cash and marketable securities	1,953			3,187
Accounts receivable (net of allowance for doubtful accounts of $1,525 and $717, respectively)	29,167			30,698
Deferred rent receivable (net of allowance of $1,962 and $1,418, respectively)	105,484			95,910
Intangible assets on real estate acquisitions, net	98,338			43,854
Deferred leasing costs (net of accumulated amortization of $66,364 and $69,998, respectively)	53,868			53,927
Investing receivables	47,875			52,147
Prepaid expenses and other assets, net	60,024			61,301
Total assets	$	3,903,549		$	3,658,354
Liabilities and equity
Liabilities:
Debt, net	$	2,077,752		$	1,914,036
Accounts payable and accrued expenses	91,755			123,035
Rents received in advance and security deposits	37,148			31,011
Distributions payable	30,178			29,862
Deferred revenue associated with operating leases	19,758			13,031
Interest rate derivatives	3,160			1,855
Other liabilities	8,016			6,223
Total liabilities	2,267,767			2,119,053
Commitments and contingencies (Note 20)
Redeemable noncontrolling interests	19,218			18,417
Equity:
Corporate Office Properties, L.P.’s equity:
Preferred units
General partner, preferred units outstanding of 7,431,667 at December 31, 2015 and 2014	199,083			199,083
Limited partner, 352,000 preferred units outstanding at December 31, 2015 and 2014	8,800			8,800
Common units, 94,531,512 and 93,255,284 held by the general partner and 3,677,391 and 3,837,551 held by limited partners at December 31, 2015 and 2014, respectively	1,400,745			1,305,219
Accumulated other comprehensive loss	(2,985		)	(1,381		)
Total Corporate Office Properties, L.P.’s equity	1,605,643			1,511,721
Noncontrolling interests in subsidiaries	10,921			9,163
Total equity	1,616,564			1,520,884
Total liabilities, redeemable noncontrolling interest and equity	$	3,903,549		$	3,658,354

See accompanying notes to consolidated financial statements.

F-12

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Operations

(in thousands, except per unit data)

	For the Years Ended December 31,
	2015			2014			2013
Revenues
Rental revenue	$	420,340		$	386,396		$	377,611
Tenant recoveries and other real estate operations revenue	98,724			93,329			83,386
Construction contract and other service revenues	106,402			106,748			62,363
Total revenues	625,466			586,473			523,360
Expenses
Property operating expenses	194,494			179,934			167,199
Depreciation and amortization associated with real estate operations	140,025			136,086			113,214
Construction contract and other service expenses	102,696			100,058			58,875
Impairment losses	23,289			1,416			5,857
General, administrative and leasing expenses	31,361			31,794			30,869
Business development expenses and land carry costs	13,507			5,573			5,436
Total operating expenses	505,372			454,861			381,450
Operating income	120,094			131,612			141,910
Interest expense	(89,074		)	(92,393		)	(82,010		)
Interest and other income	4,517			4,923			3,834
Gain (loss) on early extinguishment of debt	85,275			(9,552		)	(27,030		)
Income from continuing operations before equity in income of unconsolidated entities and income taxes	120,812			34,590			36,704
Equity in income of unconsolidated entities	62			229			2,110
Income tax expense	(199		)	(310		)	(1,978		)
Income from continuing operations	120,675			34,509			36,836
Discontinued operations	156			26			55,692
Income before gain on sales of real estate	120,831			34,535			92,528
Gain on sales of real estate, net of income taxes	68,047			10,671			9,016
Net income	188,878			45,206			101,544
Net income attributable to noncontrolling interests in consolidated entities	(3,520		)	(3,276		)	(3,907		)
Net income attributable to COPLP	185,358			41,930			97,637
Preferred unit distributions	(14,870		)	(16,599		)	(20,631		)
Issuance costs associated with redeemed preferred units	—			(1,769		)	(2,904		)
Net income attributable to COPLP common unitholders	$	170,488		$	23,562		$	74,102
Net income attributable to COPLP:
Income from continuing operations	$	185,199		$	41,899		$	42,875
Discontinued operations, net	159			31			54,762
Net income attributable to COPLP	$	185,358		$	41,930		$	97,637
Basic earnings per common unit (1)
Income from continuing operations	$	1.74		$	0.25		$	0.21
Discontinued operations	—			—			0.62
Net income attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.83
Diluted earnings per common unit (1)
Income from continuing operations	$	1.74		$	0.25		$	0.21
Discontinued operations	—			—			0.62
Net income attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.83

(1) Basic and diluted earnings per common unit are calculated based on amounts attributable to common unitholders of Corporate Office Properties, L.P.

See accompanying notes to consolidated financial statements.

F-13

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Comprehensive Income/Loss

(in thousands)

	For the Years Ended December 31,
	2015			2014			2013
Net income	$	188,878		$	45,206		$	101,544
Other comprehensive (loss) income
Unrealized (losses) gains on interest rate derivatives	(4,739		)	(7,799		)	6,791
Losses on interest rate derivatives included in interest expense	3,599			2,990			2,740
Losses on interest rate derivatives included in loss on early extinguishment of debt	—			38			—
Unrealized equity in other comprehensive (loss) income of equity method investee	(264		)	—			1,070
Realized equity in other comprehensive income of equity method investee	—			—			(1,070		)
Other comprehensive (loss) income	(1,404		)	(4,771		)	9,531
Comprehensive income	187,474			40,435			111,075
Comprehensive income attributable to noncontrolling interests	(3,720		)	(3,492		)	(4,125		)
Comprehensive income attributable to COPLP	$	183,754		$	36,943		$	106,950

See accompanying notes to consolidated financial statements.

F-14

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Equity

(Dollars in thousands)

	Limited Partner Preferred Units				General Partner Preferred Units					Common Units				Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests in Subsidiaries			Total Equity
	Units	Amount			Units		Amount			Units	Amount
Balance at December 31, 2012	352,000	$	8,800		12,821,667		$	333,833		85,020,528	$	1,089,391		$	(5,708	)	$	10,183		$	1,436,499
Redemption of preferred units resulting from redemption of preferred shares	—	—			(3,390,000	)	(84,750		)	—	—			—			—			(84,750		)
Issuance of common units resulting from public issuance of common shares	—	—			—		—			4,485,000	117,961			—			—			117,961
Issuance of common units resulting from common shares issued under COPT at-the-market program	—	—			—		—			1,500,000	38,447			—			—			38,447
Acquisition of property and noncontrolling interest in subsidiary for COPLP common units	—	—					—			221,501	3,899			—			(2,530		)	1,369
Issuance of common units resulting from exercise of share options	—	—			—		—			39,331	779			—			—			779
Share-based compensation (units net of redemption)	—	—			—		—			105,852	7,605			—			—			7,605
Redemptions of vested equity awards	—	—			—		—			—	(2,002		)	—			—			(2,002		)
Comprehensive income	—	660			—		19,971			—	77,006			9,313			2,749			109,699
Distributions to owners of common and preferred units	—	(660		)	—		(19,971		)	—	(99,525		)	—			—			(120,156		)
Contributions from noncontrolling interests in subsidiaries	—	—			—		—			—	—			—			86			86
Distributions to noncontrolling interests in subsidiaries	—	—			—		—			—	—			—			(1,045		)	(1,045		)
Adjustment to arrive at fair value of redeemable noncontrolling interest	—	—			—		—			—	(7,121		)	—			—			(7,121		)
Tax loss from share-based compensation	—	—			—		—			—	(122		)	—			—			(122		)
Balance at December 31, 2013	352,000	8,800			9,431,667		249,083			91,372,212	1,226,318			3,605			9,443			1,497,249
Redemption of preferred units resulting from redemption of preferred shares	—	—			(2,000,000	)	(50,000		)	—	—			—			—			(50,000		)
Issuance of common units resulting from public issuance of common shares	—	—			—		—			5,520,000	148,666			—			—			148,666
Issuance of common units resulting from exercise of share options	—	—			—		—			62,888	1,489			—			—			1,489
Share-based compensation (units net of redemption)	—	—			—		—			137,735	7,050			—			—			7,050
Redemptions of vested equity awards	—	—			—		—			—	(1,554		)	—			—			(1,554		)
Comprehensive income	—	660			—		15,939			—	25,331			(4,986		)	1,330			38,274
Distributions to owners of common and preferred units	—	(660		)	—		(15,939		)	—	(102,212		)	—			—			(118,811		)
Contributions from noncontrolling interests in subsidiaries	—	—			—		—			—	—			—			3			3
Distributions to noncontrolling interests in subsidiaries	—	—			—		—			—	—			—			(1,613		)	(1,613		)
Adjustment to arrive at fair value of redeemable noncontrolling interest	—	—			—		—			—	134			—			—			134
Tax loss from share-based compensation	—	—			—		—			—	(3		)	—			—			(3		)
Balance at December 31, 2014	352,000	8,800			7,431,667		199,083			97,092,835	1,305,219			(1,381		)	9,163			1,520,884
Issuance of common units resulting from common shares issued under COPT at-the-market program	—	—			—		—			890,241	26,535			—			—			26,535
Issuance of common units resulting from exercise of share options	—	—			—		—			76,474	2,008			—			—			2,008
Share-based compensation (units net of redemption)	—	—			—		—			149,353	7,398			—			—			7,398
Redemptions of vested equity awards	—	—			—		—			—	(2,462		)	—			—			(2,462		)
Comprehensive income	—	660			—		14,210			—	170,488			(1,604		)	1,493			185,247
Distributions to owners of common and preferred units	—	(660		)	—		(14,210		)	—	(108,044		)	—			—			(122,914		)
Contributions from noncontrolling interests in subsidiaries	—	—			—		—			—	—			—			300			300
Distributions to noncontrolling interests in subsidiaries	—	—			—		—			—	—			—			(35		)	(35		)
Adjustment to arrive at fair value of redeemable noncontrolling interests	—	—			—		—			—	116			—			—			116
Tax loss from share-based compensation	—	—			—		—			—	(513		)	—			—			(513		)
Balance at December 31, 2015	352,000	$	8,800		7,431,667		$	199,083		98,208,903	$	1,400,745		$	(2,985	)	$	10,921		$	1,616,564

See accompanying notes to consolidated financial statements.

F-15

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Cash Flows

(in thousands)

	For the Years Ended December 31,
	2015			2014			2013
Cash flows from operating activities
Revenues from real estate operations received	$	501,779		$	479,605		$	482,763
Construction contract and other service revenues received	117,107			89,180			63,647
Property operating expenses paid	(190,281		)	(178,803		)	(176,243		)
Construction contract and other service expenses paid	(124,481		)	(79,271		)	(63,853		)
General, administrative, leasing, business development and land carry costs paid	(38,113		)	(29,521		)	(28,022		)
Interest expense paid	(65,816		)	(79,095		)	(81,575		)
Previously accreted interest expense paid	—			—			(11,116		)
Exit costs on property dispositions	—			—			(979		)
Payments in connection with early extinguishment of debt	(373		)	(9,017		)	(27,909		)
Interest and other income received	4,194			607			2,260
Income taxes (paid) refunded	(8		)	200			6
Net cash provided by operating activities	204,008			193,885			158,979
Cash flows from investing activities
Acquisitions of operating properties and related intangible assets	(202,866		)	—			—
Construction, development and redevelopment	(234,346		)	(200,385		)	(201,808		)
Tenant improvements on operating properties	(29,413		)	(27,037		)	(21,950		)
Other capital improvements on operating properties	(23,147		)	(28,720		)	(23,940		)
Proceeds from dispositions of properties	193,735			57,782			148,569
Investing receivables funded	(22		)	(3,731		)	(14,077		)
Investing receivables payments received	5,114			10,279			144
Leasing costs paid	(13,710		)	(16,234		)	(14,429		)
Decrease in restricted cash associated with investing activities	1,455			1,137			8,178
Other	(4,332		)	(2,780		)	(477		)
Net cash used in investing activities	(307,532		)	(209,689		)	(119,790		)
Cash flows from financing activities
Proceeds from debt
Revolving Credit Facility	522,000			232,000			504,000
Unsecured senior notes	296,580			297,342			592,413
Other debt proceeds	164,000			11,569			94,049
Repayments of debt
Revolving Credit Facility	(561,500		)	(149,000		)	(504,000		)
Scheduled principal amortization	(6,728		)	(6,517		)	(9,481		)
Other debt repayments	(155,307		)	(394,653		)	(612,093		)
Deferred financing costs paid	(7,522		)	(708		)	(9,361		)
Net proceeds from issuance of common units	28,567			150,174			157,444
Redemption of preferred units	—			(50,000		)	(84,750		)
Common unit distributions paid	(107,730		)	(100,678		)	(97,772		)
Preferred unit distributions paid	(14,870		)	(17,391		)	(21,995		)
Redemption of vested equity awards	(2,462		)	(1,554		)	(2,002		)
Other	2,729			(3,076		)	(1,862		)
Net cash provided by (used in) financing activities	157,757			(32,492		)	4,590
Net increase (decrease) in cash and cash equivalents	54,233			(48,296		)	43,779
Cash and cash equivalents
Beginning of period	6,077			54,373			10,594
End of period	$	60,310		$	6,077		$	54,373

See accompanying notes to consolidated financial statements.

F-16

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Cash Flows (Continued)

(in thousands)

	For the Years Ended December 31,
	2015			2014			2013
Reconciliation of net income to net cash provided by operating activities:
Net income	$	188,878		$	45,206		$	101,544
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and other amortization	142,231			138,490			119,773
Impairment losses	23,523			1,419			31,068
Settlement of previously accreted interest expense	—			—			(11,116		)
Amortization of deferred financing costs	4,466			4,666			5,451
Increase in deferred rent receivable	(14,969		)	(3,520		)	(5,196		)
Amortization of net debt discounts	1,122			921			1,159
Gain on sales of real estate	(68,047		)	(10,695		)	(11,687		)
Share-based compensation	6,574			6,164			6,530
(Gain) loss on early extinguishment of debt	(86,028		)	651			(68,689		)
Other	528			(3,242		)	(3,093		)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	1,331			(2,011		)	(11,698		)
(Increase) decrease in restricted cash and marketable securities	(1,360		)	(234		)	1,267
Decrease (increase) in prepaid expenses and other assets, net	2,853			(10,126		)	(3,764		)
(Decrease) increase in accounts payable, accrued expenses and other liabilities	(3,501		)	26,677			3,269
Increase (decrease) in rents received in advance and security deposits	6,407			(481		)	4,161
Net cash provided by operating activities	$	204,008		$	193,885		$	158,979
Supplemental schedule of non-cash investing and financing activities:
(Decrease) increase in accrued capital improvements, leasing and other investing activity costs	$	(14,797	)	$	(3,779	)	$	2,947
Debt assumed on acquisition of operating property	$	55,490		$	—		$	—
Other liabilities assumed on acquisition of operating properties	$	5,179		$	—		$	—
Decrease in property in connection with transfer of property in settlement of debt	$	(82,738	)	$	—		$	(73,780	)
Decrease in debt in connection with transfer of property in settlement of debt	$	(150,000	)	$	—		$	(146,500	)
Increase in property and redeemable noncontrolling interests in connection with property contribution by a redeemable noncontrolling interest in a joint venture	$	1,415		$	—		$	—
(Decrease) increase in fair value of derivatives applied to accumulated other comprehensive income (loss) and noncontrolling interests	$	(1,140	)	$	(4,866	)	$	9,470
Equity in other comprehensive loss of an equity method investee	$	(264	)	$	—		$	—
Distributions payable	$	30,178		$	29,862		$	29,080
COPLP common units issued to acquire property and noncontrolling interest in other consolidated entity	$	—		$	—		$	5,194
(Decrease) increase in redeemable noncontrolling interest and (increase) decrease in equity to carry redeemable noncontrolling interests at fair value	$	(116	)	$	(134	)	$	7,121

See accompanying notes to consolidated financial statements.

F-17

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements

1.    Organization

Corporate Office Properties Trust (“COPT”) and subsidiaries (collectively, the “Company”) is a fully-integrated and self-managed real estate investment trust (“REIT”). Corporate Office Properties, L.P. (“COPLP”) and subsidiaries (collectively, the “Operating Partnership”) is the entity through which COPT, the sole general partner of COPLP, conducts almost all of its operations and owns almost all of its assets. Unless otherwise expressly stated or the context otherwise requires, “we”, “us” and “our” as used herein refer to each of the Company and the Operating Partnership. We own, manage, lease, develop and selectively acquire office and data center properties. The majority of our portfolio is in locations that support United States Government agencies and their contractors, most of whom are engaged in national security, defense and information technology (“IT”) related activities servicing what we believe are growing, durable priority missions (“Defense/IT Locations”). We also own a complementary portfolio of traditional office properties located in select urban/urban-like submarkets within our regional footprint with durable Class-A office fundamentals and characteristics, as well as other properties supporting general commercial office tenants (“Regional Office”). As of December 31, 2015, our properties included the following (all references to number of properties, square footage, acres and megawatts are unaudited):

• 177 operating office properties totaling 18.1 million square feet, including nine triple-net leased, single-tenant data center properties;

• 13 office properties under, or contractually committed for, construction or redevelopment that we estimate will total approximately 1.5 million square feet upon completion, including one partially operational property included above;

• 1,439 acres of land we control that we believe are potentially developable into approximately 17.6 million square feet; and

• a wholesale data center with a critical load of 19.25 megawatts.

COPLP owns real estate both directly and through subsidiary partnerships and limited liability companies (“LLCs”).  In addition to owning real estate, COPLP also owns subsidiaries that provide real estate services such as property management and construction and development services primarily for our properties but also for third parties. Some of these services are performed by a taxable REIT subsidiary (“TRS”).

Equity interests in COPLP are in the form of common and preferred units. As of December 31, 2015, COPT owned 96.3% of the outstanding COPLP common units (“common units”) and 95.5% of the outstanding COPLP preferred units (“preferred units”); the remaining common and preferred units in COPLP were owned by third parties. Common units in COPLP not owned by COPT carry certain redemption rights. The number of common units in COPLP owned by COPT is equivalent to the number of outstanding common shares of beneficial interest (“common shares”) of COPT, and the entitlement of all COPLP common units to quarterly distributions and payments in liquidation is substantially the same as those of COPT common shareholders. Similarly, in the case of each series of preferred units in COPLP held by COPT, there is a series of preferred shares of beneficial interest (“preferred shares”) in COPT that is equivalent in number and carries substantially the same terms as such series of COPLP preferred units. COPT’s common shares are publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “OFC”.

Because COPLP is managed by COPT, and COPT conducts substantially all of its operations through COPLP, we refer to COPT’s executive officers as COPLP’s executive officers, and although, as a partnership, COPLP does not have a board of trustees, we refer to COPT’s Board of Trustees as COPLP’s Board of Trustees.

2.Summary of Significant Accounting Policies

Basis of Presentation

The COPT consolidated financial statements include the accounts of COPT, the Operating Partnership, their subsidiaries and other entities in which COPT has a majority voting interest and control.  The COPLP consolidated financial statements include the accounts of COPLP, its subsidiaries and other entities in which COPLP has a majority voting interest and control.  We also consolidate certain entities when control of such entities can be achieved through means other than voting rights (“variable interest entities” or “VIEs”) if we are deemed to be the primary beneficiary of such entities.  We eliminate all intercompany balances and transactions in consolidation.

We use the equity method of accounting when we own an interest in an entity and can exert significant influence over but cannot control the entity’s operations. We discontinue equity method accounting if our investment in an entity (and net

F-18

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

advances) is reduced to zero unless we have guaranteed obligations of the entity or are otherwise committed to provide further financial support for the entity.

We use the cost method of accounting when we own an interest in an entity and cannot exert significant influence over its operations.

Reclassification

We reclassified certain amounts from prior periods to conform to the current period presentation of our consolidated financial statements, including amounts related to our adoption of guidance regarding the presentation of deferred debt issuance costs (discussed below) and our change in reportable segments (discussed in Note 17), with no effect on previously reported net income or equity.

Use of Estimates in the Preparation of Financial Statements

We make estimates and assumptions when preparing financial statements under generally accepted accounting principles (“GAAP”). These estimates and assumptions affect various matters, including:

• the reported amounts of assets and liabilities in our consolidated balance sheets at the dates of the financial statements;

• the disclosure of contingent assets and liabilities at the dates of the financial statements; and

• the reported amounts of revenues and expenses in our consolidated statements of operations during the reporting periods.

Significant estimates are inherent in the presentation of our financial statements in a number of areas, including the evaluation of the collectability of accounts and deferred rent receivable, the allocation of property acquisition costs, the determination of estimated useful lives of assets, the determination of lease terms, the evaluation of impairment of long-lived assets, the amount of impairment losses recognized, the amount of revenue recognized relating to tenant improvements, the level of expense recognized in connection with share-based compensation and the determination of accounting method for investments. Actual results could differ from these and other estimates.

Acquisitions of Properties

Upon completion of property acquisitions, we allocate the purchase price to tangible and intangible assets and liabilities associated with such acquisitions based on our estimates of their fair values. We determine these fair values by using market data and independent appraisals available to us and making numerous estimates and assumptions. We allocate property acquisitions to the following components:

• properties based on a valuation performed under the assumption that the property is vacant upon acquisition (the “if-vacant value”). The if-vacant value is allocated between land and buildings or, in the case of properties under development, construction in progress. We also allocate additional amounts to properties for in-place tenant improvements based on our estimate of improvements per square foot provided under market leases that would be attributable to the remaining non-cancelable terms of the respective leases;

• above- and below-market lease intangible assets or liabilities based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between: (1) the contractual amounts to be received pursuant to the in-place leases; and (2) our estimate of fair market lease rates for the corresponding space, measured over a period equal to the remaining non-cancelable term of the lease. The capitalized above- and below-market lease values are amortized as adjustments to rental revenue over the remaining lease terms of the respective leases, and to renewal periods in the case of below-market leases;

• in-place lease value based on our estimates of: (1) the present value of additional income to be realized as a result of leases being in place on the acquired properties; and (2) costs to execute similar leases. Our estimate of additional income to be realized includes carrying costs, such as real estate taxes, insurance and other operating expenses, and revenues during the expected lease-up periods considering current market conditions. Our estimate of costs to execute similar leases includes leasing commissions, legal and other related costs;

• tenant relationship value based on our evaluation of the specific characteristics of each tenant's lease and our overall relationship with that respective tenant. Characteristics we consider in determining these values include the nature and extent of our existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant's credit quality and expectations of lease renewals, among other factors; and

F-19

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

• above- and below- market cost arrangements (such as real estate tax treaties or above- or below- market ground leases) based on the present value of the expected benefit from any such arrangements in place on the property at the time of acquisition.

Intangible Assets and Deferred Revenue on Real Estate Acquisitions

We amortize the intangible assets and deferred revenue on real estate acquisitions discussed above as follows:

Asset Type	Amortization Period
Above- and below-market leases	Related lease terms
In-place lease value	Related lease terms
Tenant relationship value	Estimated period of time that tenant will lease space in property
Above- and below-market cost arrangements	Term of arrangements

We recognize the amortization of acquired above-market and below-market leases as adjustments to rental revenue. We recognize the amortization of above- and below- market cost arrangements as adjustments to property operating expenses. We recognize the amortization of other intangible assets on property acquisitions as amortization expense.

Properties

We report properties to be developed or held and used in operations at our depreciated cost, reduced for impairment losses. The preconstruction stage of the development or redevelopment of an operating property includes efforts and related costs to secure land control and zoning, evaluate feasibility and complete other initial tasks which are essential to development.

We capitalize interest expense, real estate taxes and direct and indirect project costs (including related compensation and other indirect costs) associated with properties, or portions thereof, undergoing construction, development and redevelopment activities. In capitalizing interest expense, if there is a specific borrowing for the property undergoing construction, development and redevelopment activities, we apply the interest rate of that borrowing to the average accumulated expenditures that do not exceed such borrowing; for the portion of expenditures exceeding any such specific borrowing, we apply our weighted average interest rate on other borrowings to the expenditures. We continue to capitalize costs while construction, development or redevelopment activities are underway until a property becomes “operational,” which occurs when lease terms commence (generally when the tenant has control of the leased space and we have delivered the premises to the tenant as required under the terms of such lease), but no later than one year after the cessation of major construction activities. When leases commence on portions of a newly-constructed or redeveloped property in the period prior to one year from the cessation of major construction activities, we consider that property to be “partially operational.” When a property is partially operational, we allocate the costs associated with the property between the portion that is operational and the portion under construction. We start depreciating newly-constructed and redeveloped properties as they become operational.

Most of our leases involve some form of improvements to leased space. When we are required to provide improvements under the terms of a lease, we determine whether the improvements constitute landlord assets or tenant assets. If the improvements are landlord assets, we capitalize the cost of the improvements and recognize depreciation expense associated with such improvements over the shorter of the useful life of the assets or the term of the lease and recognize any payments from the tenant as rental revenue over the term of the lease. If the improvements are tenant assets, we defer the cost of improvements funded by us as a lease incentive asset and amortize it as a reduction of rental revenue over the term of the lease. In determining whether improvements constitute landlord or tenant assets, we consider numerous factors, including: whether the improvements are unique to the tenant or reusable by other tenants; whether the tenant is permitted to alter or remove the improvements without our consent or without compensating us for any lost fair value; whether the ownership of the improvements remains with us or remains with the tenant at the end of the lease term; and whether the economic substance of the lease terms is properly reflected.

F-20

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

We depreciate our fixed assets using the straight-line method over their estimated useful lives as follows:

	Estimated Useful Lives
Buildings and building improvements	10-40 years
Land improvements	10-20 years
Tenant improvements on operating properties	Related lease term
Equipment and personal property	3-10 years

We assess each of our operating properties for impairment quarterly using cash flow projections and estimated fair values that we derive for each of the properties.  We update the leasing and other assumptions used in these projections regularly, paying particular attention to properties that have experienced chronic vacancy or face significant market challenges.  We review our plans and intentions for our development projects and land parcels quarterly.  If our analyses indicate that the carrying values of operating properties, properties in development or land held for future development may be impaired, we perform a recovery analysis for such properties.  For long-lived assets to be held and used, we analyze recoverability based on the estimated undiscounted future cash flows expected to be generated from the operations and eventual disposition of the assets over, in most cases, a ten-year holding period.  If we believe there is a significant possibility that we might dispose of the assets earlier, we analyze recoverability using a probability weighted analysis of the estimated undiscounted future cash flows expected to be generated from the operations and eventual disposition of the assets over the various possible holding periods.  If the recovery analysis indicates that the carrying value of a tested property is not recoverable from estimated future cash flows, it is written down to its estimated fair value and an impairment loss is recognized.  If and when our plans change, we revise our recoverability analyses to use the cash flows expected from the operations and eventual disposition of each asset using holding periods that are consistent with our revised plans. Changes in holding periods may require us to recognize significant impairment losses. 

Fair values are estimated based on contract prices, indicative bids, discounted cash flow analyses, yield analyses or sales comparison approach. Estimated cash flows used in such analyses are based on our plans for the property and our views of market and economic conditions. The estimates consider factors such as current and future rental rates, occupancies for the tested property and comparable properties, estimated operating and capital expenditures and recent sales data for comparable properties; most of these factors are influenced by market data obtained from real estate leasing and brokerage firms and our direct experience with the properties and their markets.

When we determine that a property is held for sale, we stop depreciating the property and estimate the property’s fair value, net of selling costs; if we then determine that the estimated fair value, net of selling costs, is less than the net book value of the property, we recognize an impairment loss equal to the difference and reduce the net book value of the property. For periods in which a property is classified as held for sale, we classify the assets of the property as held for sale on our consolidated balance sheet for such periods.

For dispositions of operating properties occurring prior to June 30, 2014 in which we had no significant continuing involvement, or for operating properties held for sale prior to June 30, 2014, we classify the results of operations for such properties as discontinued operations; interest expense that is specifically identifiable to properties included in discontinued operations is used in the computation of interest expense attributable to discontinued operations. We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) related to the reporting of discontinued operations and disclosures of disposals of components of an entity effective for the quarterly period ended June 30, 2014. This guidance defines a discontinued operation as a component or group of components disposed or classified as held for sale that represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results; the guidance states that a strategic shift could include a disposal of a major geographical area of operations, a major line of business, a major equity method investment or other major parts of an entity. We have had no properties newly classified as discontinued operations subsequent to our adoption of this guidance.

Sales of Interests in Real Estate

We recognize gains from sales of interests in real estate using the full accrual method, provided that various criteria relating to the terms of sale and any subsequent involvement by us with the real estate sold are met.

F-21

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

Cash and Cash Equivalents

Cash and cash equivalents include all cash and liquid investments that mature three months or less from when they are purchased. Cash equivalents are reported at cost, which approximates fair value. We maintain our cash in bank accounts in amounts that may exceed Federally insured limits at times. We have not experienced any losses in these accounts in the past and believe that we are not exposed to significant credit risk because our accounts are deposited with major financial institutions.

Investments in Marketable Securities

We classify marketable securities as trading securities when we have the intent to sell such securities in the near term, and classify other marketable securities as available-for-sale securities. We determine the appropriate classification of investments in marketable securities at the acquisition date and re-evaluate the classification at each balance sheet date. We report investments in marketable securities classified as trading securities at fair value, with unrealized gains and losses recognized through earnings; on our consolidated statements of cash flows, we classify cash flows from these securities as operating activities.

Accounts and Deferred Rents Receivable and Investing Receivables

We maintain allowances for estimated losses resulting from the failure of our customers or borrowers to satisfy their payment obligations. We use judgment in estimating these allowances based primarily upon the payment history and credit status of the entities associated with the individual receivables. We write off these receivables when we believe the facts and circumstances indicate that continued pursuit of collection is no longer warranted. When cash is received in connection with receivables for which we have established allowances, we reduce the amount of losses previously recognized.

We evaluate the collectibility of both interest and principal of loans whenever events or changes in circumstances indicate such amounts may not be recoverable. A loan is impaired when it is probable that we will be unable to collect all amounts due according to the existing contractual terms.  When a loan is impaired, the amount of the loss accrual is calculated by comparing the carrying amount of the investment to the present value of expected future cash flows discounted at the loan’s effective interest rate and the value of any collateral under such loan.

Interest on impaired loans is recognized when received in cash.

Deferred Leasing and Financing Costs

We defer costs incurred to obtain new tenant leases or extend existing tenant leases, including related compensation costs. We amortize these costs evenly over the lease terms. When tenant leases are terminated early, we expense any unamortized deferred leasing costs associated with those leases over the shortened term of the lease.

We defer costs of financing arrangements and recognize these costs as interest expense over the related loan terms on a straight-line basis, which approximates the amortization that would occur under the effective interest method of amortization. We expense any unamortized loan costs when loans are retired early.

In April 2015, the FASB issued guidance that changes the presentation of deferred debt issuance costs in financial statements. This guidance requires an entity to present such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset. This guidance was further updated in August 2015 with respect to debt issuance costs of line-of-credit arrangements to note that it will be permissible for an entity to defer and present debt issuance costs as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of a line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. We adopted this guidance effective for the quarterly period ended December 31, 2015 retrospectively to each prior period presented. The application of this guidance changed the balance sheet classification of most of our deferred financing costs but did not otherwise affect our consolidated financial statements. For costs of such arrangements attributable to line-of-credit arrangements and interest rate derivatives, we present such costs in the balance sheet in the line entitled prepaid and other assets.

F-22

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

Noncontrolling Interests

COPT’s consolidated noncontrolling interests are comprised of interests in COPLP not owned by COPT (discussed further in Note 14) and consolidated real estate joint ventures (discussed further in Note 6). COPLP’s consolidated noncontrolling interests are comprised primarily of interests in our consolidated real estate joint ventures. Also included in COPLP’s consolidated noncontrolling interests are interests in several real estate entities owned directly by COPT, or a wholly owned subsidiary of COPT, that generally do not exceed 1% of interests in such entities. We evaluate whether noncontrolling interests are subject to redemption features outside of our control. For noncontrolling interests that are currently redeemable for cash at the option of the holders of such interests or deemed probable to eventually become redeemable, we classify such interests as redeemable noncontrolling interests in the mezzanine section of our consolidated balance sheets; we adjust these interests each period to the greater of their fair value or carrying amount (initial amount as adjusted for allocations of income and losses and contributions and distributions), with a corresponding offset to additional paid-in capital on COPT’s consolidated balance sheets or common units on COPLP’s balance sheet, and only recognize reductions in such interests to the extent of their carrying amount. Our other noncontrolling interests are reported in the equity section of our consolidated balance sheets. The amounts reported for noncontrolling interests on our consolidated statements of operations represent the portion of these entities’ income or losses not attributable to us.

Revenue Recognition

We recognize minimum rents, net of abatements, on a straight-line basis over the term of tenant leases. A lease term generally commences when: (1) the tenant has control of the leased space (legal right to use the property); and (2) we have delivered the premises to the tenant as required under the terms of such lease. The term of a lease generally includes periods when a tenant: (1) may not terminate its lease obligation early; (2) may terminate its lease obligation early in exchange for a fee or penalty that we consider material enough such that termination would not be probable; (3) possesses renewal rights and the tenant’s failure to exercise such rights imposes a penalty on the tenant material enough such that renewal appears reasonably assured; or (4) possesses bargain renewal options for such periods. We report the amount by which our minimum rental revenue recognized on a straight-line basis under leases exceeds the contractual rent billings associated with such leases as deferred rent receivable on our consolidated balance sheets. Amounts by which our minimum rental revenue recognized on a straight-line basis under leases are less than the contractual rent billings associated with such leases are included in deferred revenue associated with operating leases on our consolidated balance sheets.

In connection with a tenant’s entry into, or modification of, a lease, if we make cash payments to, or on behalf of, the tenant for purposes other than funding the construction of landlord assets, we defer the amount of such payments as lease incentives. As discussed above, when we are required to provide improvements under the terms of a lease, we determine whether the improvements constitute landlord assets or tenant assets; if the improvements are tenant assets, we defer the cost of improvements funded by us as a lease incentive asset. We amortize lease incentives as a reduction of rental revenue over the term of the lease.

We recognize tenant recovery revenue in the same periods in which we incur the related expenses. Tenant recovery revenue includes payments from tenants as reimbursement for property taxes, utilities and other property operating expenses.

We recognize fees received for lease terminations as revenue and write off against such revenue any (1) deferred rents receivable, and (2) deferred revenue, lease incentives and intangible assets that are amortizable into rental revenue associated with the leases; the resulting net amount is the net revenue from the early termination of the leases. When a tenant's lease for space in a property is terminated early but the tenant continues to lease such space under a new or modified lease in the property, the net revenue from the early termination of the lease is recognized evenly over the remaining life of the new or modified lease in place on that property.

We recognize fees for services provided by us once services are rendered, fees are determinable and collectability is assured. We recognize revenue under construction contracts using the percentage of completion method when the revenue and costs for such contracts can be estimated with reasonable accuracy; when these criteria do not apply to a contract, we recognize revenue on that contract using the completed contract method. Under the percentage of completion method, we recognize a percentage of the total estimated revenue on a contract based on the cost of services provided on the contract as of a point in time relative to the total estimated costs on the contract.

F-23

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

Interest Rate Derivatives

Our primary objectives in using interest rate derivatives are to add stability to interest expense and to manage exposure to interest rate movements. To accomplish this objective, we primarily use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for our making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.  Derivatives are used to hedge the cash flows associated with interest rates on existing debt as well as future debt. We recognize all derivatives as assets or liabilities on our consolidated balance sheet at fair value. We defer the effective portion of changes in fair value of the designated cash flow hedges to AOCI and reclassify such deferrals to interest expense as interest expense is recognized on the hedged forecasted transactions. We recognize the ineffective portion of the change in fair value of interest rate derivatives directly in interest expense. When an interest rate swap designated as a cash flow hedge no longer qualifies for hedge accounting, we recognize changes in fair value of the hedge previously deferred to AOCI, along with any changes in fair value occurring thereafter, through earnings. We do not use interest rate derivatives for trading or speculative purposes. We manage counter-party risk by only entering into contracts with major financial institutions based upon their credit ratings and other risk factors.

We use standard market conventions and techniques such as discounted cash flow analysis, option pricing models, replacement cost and termination cost in computing the fair value of derivatives at each balance sheet date. We made an accounting policy election to use an exception provided for in the applicable accounting guidance with respect to measuring counterparty credit risk for derivative instruments; this election enables us to measure the fair value of groups of assets and liabilities associated with derivative instruments consistently with how market participants would price the net risk exposure as of the measurement date.

Please refer to Note 11 for additional information pertaining to interest rate derivatives.

Expense Classification

We classify as property operations expense costs incurred for property taxes, ground rents, utilities, property management, insurance, repairs, exterior and interior maintenance and tenant revenue collection losses, as well as associated labor and indirect costs attributable to these costs.

We classify as general and administrative and leasing expenses costs incurred for corporate-level management, public company administration, asset management, leasing, investor relations, marketing and corporate-level insurance (including general business, director and officers and key man life) and leasing prospects, as well as associated labor and indirect costs attributable to these costs.

Share-Based Compensation

We issue three forms of share-based compensation: restricted COPT common shares (“restricted shares”), deferred share awards and performance share units (“PSUs”). We also issued options to purchase COPT common shares (“options”) in prior years. We account for share-based compensation in accordance with authoritative guidance provided by the FASB that establishes standards for the accounting for transactions in which an entity exchanges its equity instruments for goods or services, focusing primarily on accounting for transactions in which an entity obtains employee services in share-based payment transactions. The guidance requires us to measure the cost of employee services received in exchange for an award of equity instruments based generally on the fair value of the award on the grant date; such cost is then recognized over the period during which the employee is required to provide service in exchange for the award. No compensation cost is recognized for equity instruments for which employees do not render the requisite service. The guidance also requires that share-based compensation be computed based on awards that are ultimately expected to vest; as a result, future forfeitures of awards are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. If an award is voluntarily cancelled by an employee, we recognize the previously unrecognized cost associated with the original award on the date of such cancellation. We capitalize costs associated with share-based compensation attributable to employees engaged in construction and development activities.

When we adopted the authoritative guidance on accounting for share-based compensation, we elected to adopt the alternative transition method for calculating the tax effects of share-based compensation. This method enabled us to use a simplified method to establishing the beginning balance of the additional paid-in capital pool related to the tax effects of

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Notes to Consolidated Financial Statements (Continued)

employee share-based compensation that was available to absorb tax deficiencies recognized subsequent to the adoption of this guidance.

We compute the fair value of restricted shares and deferred share awards based on the fair value of COPT common shares on the grant date.

We compute the fair value of options using the Black-Scholes option-pricing model. Under that model, the risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected option life is based on our historical experience of employee exercise behavior. Expected volatility is based on historical volatility of COPT common shares. Expected dividend yield is based on the average historical dividend yield on our common shares over a period of time ending on the grant date of the options.

We compute the fair value of PSUs using a Monte Carlo model. Under that model, the baseline common share value is based on the market value on the grant date. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. Expected volatility is based on historical volatility of COPT’s common shares.

Income Taxes

COPT elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code. To qualify as a REIT, COPT must meet a number of organizational and operational requirements, including a requirement that it distribute at least 90% of the Company’s adjusted taxable income to its shareholders. As a REIT, COPT generally will not be subject to Federal income tax on taxable income that it distributes to its shareholders. If COPT fails to qualify as a REIT in any tax year, it will be subject to Federal income tax on its taxable income at regular corporate rates and may not be able to qualify as a REIT for four subsequent tax years.

COPLP is a limited partnership and is not subject to federal income tax. Its partners are required to report their respective share of the Operating Partnership’s taxable income on their respective tax returns. COPT’s share of the Operating Partnership’s taxable income is reported on COPT’s income tax return.

For Federal income tax purposes, dividends to shareholders may be characterized as ordinary income, capital gains or return of capital. The characterization of dividends paid on COPT’s common and preferred shares during each of the last three years was as follows:

	Common Shares						Preferred Shares
	For the Years Ended December 31,						For the Years Ended December 31,
	2015		2014		2013		2015		2014		2013
Ordinary income	38.3	%	64.5	%	71.8	%	38.3	%	90.9	%	76.2	%
Long-term capital gain	61.7	%	6.5	%	22.4	%	61.7	%	9.1	%	23.8	%
Return of capital	0.0	%	29.0	%	5.8	%	0.0	%	0.0	%	0.0	%

In addition, dividends paid on January 15, 2016 (with a record date of December 31, 2015) on COPT’s common and preferred shares were allocated to 2015 for Federal income tax purposes and characterized based on the percentages set forth above for 2015.

We distributed all of COPT’s REIT taxable income in 2015, 2014 and 2013 and, as a result, did not incur Federal income tax in those years.

The net basis of our consolidated assets and liabilities for tax reporting purposes was approximately $224 million lower than the amount reported on our consolidated balance sheet at December 31, 2015, which was primarily related to differences in basis for net properties, intangible assets on property acquisitions and deferred rent receivable.

We are subject to certain state and local income and franchise taxes. The expense associated with these state and local taxes is included in general and administrative expense and property operating expenses on our consolidated statements of operations. We did not separately state these amounts on our consolidated statements of operations because they are insignificant.

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Notes to Consolidated Financial Statements (Continued)

Recent Accounting Pronouncements

In May 2014, the FASB issued guidance regarding the recognition of revenue from contracts with customers. Under this guidance, an entity will recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additionally, this guidance requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We are required to adopt this guidance for our annual and interim periods beginning January 1, 2018 using one of two methods: retrospective restatement for each reporting period presented at the time of adoption, or retrospectively with the cumulative effect of initially applying this guidance recognized at the date of initial application. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In January 2015, the FASB issued guidance regarding the presentation of extraordinary and unusual items in statements of operations. This guidance eliminates the concept of extraordinary items. However, the presentation and disclosure requirements for items that are either unusual in nature or infrequent in occurrence remain and will be expanded to include items that are both unusual in nature and infrequent in occurrence. This guidance is effective for periods beginning after December 15, 2015. We expect that the application of this guidance will have no effect on our reported consolidated financial statements.

In February 2015, the FASB issued guidance regarding amendments to the consolidation analysis. This guidance amends the criteria for determining which entities are considered variable interest entities (“VIE”), amends the criteria for determining if a service provider possesses a variable interest in a VIE and ends the deferral granted to investment companies for application of the VIE consolidation model. This guidance is effective for annual periods, and interim periods therein, beginning after December 15, 2015. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

As discussed further above, we adopted guidance issued by the FASB effective for the quarterly period ended December 31, 2015 retrospectively to each prior period presented that requires an entity to present deferred debt issuance costs (other than costs of line-of-credit arrangements) in the balance sheet as a direct deduction from the related debt liability rather than as an asset.

In September 2015, the FASB issued guidance that eliminates the requirement to restate prior period financial statements for measurement period adjustments following a business combination.  The guidance requires that the cumulative impact of a measurement period adjustment (including the impact on prior periods) be recognized in the reporting period in which the adjustment is identified. The prior period impact of the adjustment should be either presented separately on the face of the statement of operations or disclosed in the notes. This guidance is effective for annual reporting periods beginning after December 15, 2015.  This guidance will be applied prospectively for measurement period adjustments that occur after the effective date.  We expect that the application of this guidance will not materially affect our consolidated financial statements.

3.Fair Value Measurements

Accounting standards define fair value as the exit price, or the amount that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The standards also establish a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability developed based on market data obtained from sources independent of us. Unobservable inputs are inputs that reflect our assumptions about the factors market participants would use in valuing the asset or liability developed based upon the best information available in the circumstances. The hierarchy of these inputs is broken down into three levels: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs include (1) quoted prices for similar assets or liabilities in active markets, (2) quoted prices for identical or similar assets or liabilities in inactive markets and (3) inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly; and Level 3 inputs are unobservable inputs for the asset or liability. Categorization within the valuation hierarchy is based upon the lowest level of input that is most significant to the fair value measurement.

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Notes to Consolidated Financial Statements (Continued)

Recurring Fair Value Measurements

COPT has a non-qualified elective deferred compensation plan for certain members of our management team that permits participants to defer up to 100% of their compensation on a pre-tax basis and receive a tax-deferred return on such deferrals. The assets held in the plan (comprised primarily of mutual funds and equity securities) and the corresponding liability to the participants are measured at fair value on a recurring basis on COPT’s consolidated balance sheet using quoted market prices, as are other marketable securities that we hold. The balance of the plan, which was fully funded, totaled $5.8 million as of December 31, 2015 and $5.9 million as of December 31, 2014, and is included in the accompanying COPT consolidated balance sheets in the line entitled restricted cash and marketable securities. The offsetting liability associated with the plan is adjusted to fair value at the end of each accounting period based on the fair value of the plan assets and reported in other liabilities on COPT’s consolidated balance sheets. The assets of the plan and other marketable securities that we hold are classified in Level 1 of the fair value hierarchy. The liability associated with the plan is classified in Level 2 of the fair value hierarchy.

The fair values of our interest rate derivatives are determined using widely accepted valuation techniques, including a discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate market data and implied volatilities in such interest rates. While we determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our interest rate derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default. However, as of December 31, 2015, we assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivatives and determined that these adjustments are not significant. As a result, we determined that our interest rate derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

As discussed further in Note 6, our partners in two real estate joint ventures, LW Redstone Company, LLC and Stevens Investors, LLC, have the right to require us to acquire their respective interests at fair value; accordingly, we classify the fair value of our partners’ interests as redeemable noncontrolling interests in the mezzanine section of our consolidated balance sheet. We determine the fair value of the interests based on unobservable inputs after considering the assumptions that market participants would make in pricing the interest. We apply a discount rate to the estimated future cash flows allocable to our partners from the properties underlying the respective joint ventures. Estimated cash flows used in such analyses are based on our plans for the properties and our views of market and economic conditions, and consider items such as current and future rental rates, occupancies for the properties and comparable properties and estimated operating and capital expenditures.

The carrying values of cash and cash equivalents, restricted cash, accounts receivable, other assets (excluding investing receivables) and accounts payable and accrued expenses are reasonable estimates of their fair values because of the short maturities of these instruments.  As discussed in Note 8, we estimated the fair values of our investing receivables based on the discounted estimated future cash flows of the loans (categorized within Level 3 of the fair value hierarchy); the discount rates used approximate current market rates for loans with similar maturities and credit quality, and the estimated cash payments include scheduled principal and interest payments.  For our disclosure of debt fair values in Note 10, we estimated the fair value of our unsecured senior notes and exchangeable senior notes based on quoted market rates for publicly-traded debt (categorized within Level 2 of the fair value hierarchy) and estimated the fair value of our other debt based on the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximate current market rates for loans, or groups of loans, with similar maturities and credit quality, and the estimated future payments include scheduled principal and interest payments.  Fair value estimates are made at a specific point in time, are subjective in nature and involve uncertainties and matters of significant judgment.  Settlement at such fair value amounts may not be possible and may not be a prudent management decision.

For additional fair value information, please refer to Note 8 for investing receivables, Note 10 for debt and Note 11 for interest rate derivatives.

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Notes to Consolidated Financial Statements (Continued)

COPT and Subsidiaries

The tables below set forth financial assets and liabilities of COPT and its subsidiaries that are accounted for at fair value on a recurring basis as of December 31, 2015 and 2014 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):

Description	Quoted Prices in Active Markets for Identical Assets(Level 1)		Significant Other Observable Inputs(Level 2)		Significant Unobservable Inputs(Level 3)		Total
December 31, 2015:
Assets:
Marketable securities in deferred compensation plan (1)
Mutual funds	$	5,658	$	—	$	—	$	5,658
Other	105		—		—		105
Interest rate derivatives (2)	—		53		—		53
Total assets	$	5,763	$	53	$	—	$	5,816
Liabilities:
Deferred compensation plan liability (3)	$	—	$	5,763	$	—	$	5,763
Interest rate derivatives	—		3,160		—		3,160
Total liabilities	$	—	$	8,923	$	—	$	8,923
December 31, 2014:
Assets:
Marketable securities in deferred compensation plan (1)
Mutual funds	$	5,756	$	—	$	—	$	5,756
Other	126		—		—		126
Interest rate derivatives (2)	—		274		—		274
Total assets	$	5,882	$	274	$	—	$	6,156
Liabilities:
Deferred compensation plan liability (3)	$	—	$	5,882	$	—	$	5,882
Interest rate derivatives	—		1,855		—		1,855
Total liabilities	$	—	$	7,737	$	—	$	7,737

(1) Included in the line entitled “restricted cash and marketable securities” on COPT’s consolidated balance sheet.

(2) Included in the line entitled “prepaid expenses and other assets” on COPT’s consolidated balance sheet.

(3) Included in the line entitled “other liabilities” on COPT’s consolidated balance sheet.

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Notes to Consolidated Financial Statements (Continued)

COPLP and Subsidiaries

The tables below set forth financial assets and liabilities of COPLP and its subsidiaries that are accounted for at fair value on a recurring basis as of December 31, 2015 and 2014 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):

Description	Quoted Prices in Active Markets for Identical Assets(Level 1)		Significant Other Observable Inputs(Level 2)		Significant Unobservable Inputs(Level 3)		Total
December 31, 2015:
Assets:
Interest rate derivatives (1)	$	—	$	53	$	—	$	53
Total Assets	$	—	$	53	$	—	$	53
Liabilities:
Interest rate derivatives	$	—	$	3,160	$	—	$	3,160
December 31, 2014:
Assets:
Interest rate derivatives (1)	$	—	$	274	$	—	$	274
Total Assets	$	—	$	274	$	—	$	274
Liabilities:
Interest rate derivatives	$	—	$	1,855	$	—	$	1,855

(1) Included in the line entitled “prepaid expenses and other assets” on COPLP’s consolidated balance sheet.

Nonrecurring Fair Value Measurements

In 2015, we recognized the following impairment losses resulting from nonrecurring fair value measurements:

• $12.8 million on land in Colorado Springs, Colorado (“Colorado Springs”). We classified some of this land as held for sale in the fourth quarter of 2015, at which time we adjusted the land to its estimated fair value less costs to sell. Due to the impairment loss on the land held for sale, we updated our estimates of fair value for other land owned in Colorado Springs and determined that the carrying value of some of this land exceeded such land’s estimated fair value, which resulted in recognition of an additional impairment loss;

• $6.6 million on land in Aberdeen, Maryland. After concluding during the fourth quarter that we no longer expected to develop operating properties on the land, we determined that the carrying amount of the land would not likely be recovered from the sale of this property over the likely remaining holding period. Accordingly, we adjusted the land to its estimated fair value;

• $2.6 million on operating properties in White Marsh, Maryland (included in our Regional Office segment) that we decided to sell and whose carrying amounts exceeded their estimated fair values less costs to sell. These properties were reclassified as held for sale during the year; and

• $1.3 million on an operating property in Northern Virginia (included in our Regional Office segment) that we sold on July 27, 2015 following receipt of an unsolicited offer. This property’s carrying value exceeded its fair value less costs to sell.

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Notes to Consolidated Financial Statements (Continued)

The table below sets forth the fair value hierarchy of the valuation technique we used to determine nonrecurring fair measurements of assets as of December 31, 2015 (dollars in thousands):

	Fair Values as of December 31, 2015
	Quoted Prices in				Significant
	Active Markets for		Significant Other		Unobservable
	Identical Assets		Observable Inputs		Inputs
Description	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Total properties, net (1)	$	—	$	—	$	13,850	$	13,850
Assets held for sale, net (2)	—		—		21,423		21,423

(1) Represents estimated fair values.

(2) Represents estimated fair values less costs to sell.

The table below sets forth quantitative information about significant unobservable inputs used for the Level 3 fair value measurements reported above as of December 31, 2015 (dollars in thousands):

Valuation Technique	Fair Values on  Measurement Date		Unobservable Input	Range (Weighted Average) (1)
Bids for property indicative of value	$	24,423	Indicative bids	N/A
Comparable sales analysis	10,850		Comparable sales prices	N/A

(1) Only one value applied for these unobservable inputs.

In 2014, we recognized impairment losses totaling $1.4 million primarily in connection with certain of our operating properties in White Marsh, Maryland (included in our Regional Office segment) that we decided to sell and whose carrying amounts exceeded the cash flows from the operations and sales of the properties over the shortened period. These properties were subsequently disposed during the year.

In 2013, we recognized the following impairment losses:

• for certain of our operating properties that served as collateral for a nonrecourse loan, we expected that the cash flows to be generated by the properties would be insufficient to fund debt service requirements on the loan. While we sought to negotiate various alternatives with the lender, on December 23, 2013, we conveyed the properties to the lender to extinguish the loan. We recognized non-cash impairment losses of $11.0 million (all classified as discontinued operations and including $560,000 in exit costs) on these properties in 2013 resulting primarily from the carrying amount of certain of these properties located in Colorado Springs (included in our Regional Office and Colorado Defense/IT Locations segments) exceeding their fair value;

• $15.2 million (all classified as discontinued operations and including $419,000 in exit costs) in connection with properties and land no longer aligned with our strategy that we sold, mostly in Colorado Springs (operating properties included primarily in our Regional Office and Colorado Defense/IT Locations segments); and

• $5.9 million on two properties in White Marsh, Maryland (included in our Regional Office segment) that we concluded no longer met our investment criteria during the year and whose carrying amounts exceeded the cash flows from the operations and sales of the properties over the shortened period.

4.Concentration of Revenue

A large concentration of our revenue from real estate operations was earned from our largest tenant, the United States Government, including 20% of our rental revenue in 2015, 18% in 2014 and 18% in 2013 (continuing and discontinued operations, and excluding tenant recoveries and other real estate operations revenue). Our rental revenue from the United States Government was earned primarily from properties in the Fort Meade/Baltimore Washington Corridor, Lackland Air Force Base, Navy Support Locations and Redstone Arsenal business subsegments (see Note 17). No other individual tenants accounted for 10% or more of our revenue from real estate operations. In addition, we also derived in excess of 90% of our construction contract revenue from the United States Government in each of the years set forth on the consolidated statements of operations.

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Notes to Consolidated Financial Statements (Continued)

In addition, we derived large concentrations of our revenue from real estate operations from certain business segments as set forth in Note 17.

5.Properties, net

Operating properties, net consisted of the following (in thousands): 

	December 31,
	2015			2014
Land	$	463,305		$	439,355
Buildings and improvements	3,157,587			3,015,216
Less: accumulated depreciation	(700,363		)	(703,083		)
Operating properties, net	$	2,920,529		$	2,751,488

In 2014, we recognized $12.9 million in additional depreciation expense resulting from our shortening of the useful life of a property in Greater Philadelphia, Pennsylvania (included in our Regional Office segment) that was removed from service for redevelopment.

Projects we had in development or held for future development consisted of the following (in thousands): 

	December 31,
	2015		2014
Land	$	207,774	$	214,977
Development in progress, excluding land	221,445		330,449
Projects in development or held for future development	$	429,219	$	545,426

As of December 31, 2015, we had 13 operating properties in White Marsh, Maryland (included in our Regional Office segment), two operating properties in San Antonio (included in our Other segment) and land in Northern Virginia and Colorado Springs classified as held for sale. The table below sets forth the components of assets held for sale on our consolidated balance sheet for these properties (in thousands):

	December 31, 2015
Properties, net	$	90,188
Deferred rent receivable	2,891
Intangible assets on real estate acquisitions, net	1,591
Deferred leasing costs, net	1,391
Lease incentives, net	721
Assets held for sale, net	$	96,782

As of December 31, 2014, we had two land parcels in White Marsh, Maryland classified as held for sale with aggregate carrying amounts of $14.3 million that were sold in 2015.

2015 Acquisitions

In 2015, we acquired the following operating properties:

• 250 W. Pratt Street, a 367,000 square foot office property in Baltimore, Maryland that was 96.2% leased, for $61.8 million on March 19, 2015;

• 2600 Park Tower Drive, a 237,000 square foot office property in Vienna, Virginia that was 100% leased, for $80.5 million on April 15, 2015; and

• 100 Light Street, a 558,000 square foot office property in Baltimore, Maryland that was 93.5% leased, and its structured parking garage, 30 Light Street, for $121.2 million on August 7, 2015. In connection with that acquisition, we assumed a $55.0 million mortgage loan with a fair value at assumption of $55.5 million.

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Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

The table below sets forth the allocation of the aggregate purchase price of these properties to the value of the acquired assets and liabilities (in thousands):

Land, operating properties	$	55,076
Building and improvements	139,540
Intangible assets on real estate acquisitions	75,729
Total assets	270,345
Below-market leases	(6,808		)
Total acquisition cost	$	263,537

Intangible assets recorded in connection with these acquisitions included the following (dollars in thousands):

			Weighted Average Amortization Period (in Years)
Tenant relationship value	$	31,183	12
In-place lease value	35,139		7
Above-market leases	6,720		4
Below-market cost arrangements	2,687		40
	$	75,729	10

These properties contributed revenues of $20.2 million and net income from continuing operations of $1.2 million in 2015. We expensed operating property acquisition costs of $4.1 million in 2015 that are included in business development expenses and land carry costs on our consolidated statements of operations.

We accounted for these acquisitions as business combinations. We included the results of operations for the acquisitions in our consolidated statements of operations from their respective purchase dates through December 31, 2015. The following table presents pro forma information for COPT and subsidiaries as if these acquisitions had occurred on January 1, 2014. This pro forma information also includes adjustments to reclassify the operating property acquisition costs disclosed above from the 2015 periods in which they were incurred to the year ended December 31, 2014. The pro forma financial information was prepared for comparative purposes only and is not necessarily indicative of what would have occurred had these acquisitions been made at that time or of results which may occur in the future (in thousands, except per shares amounts).

	For the Year Ended December 31,
	2015		2014
	(Unaudited)
Pro forma total revenues	$	641,982	$	623,013
Pro forma net income attributable to COPT common shareholders	$	167,079	$	20,796
Pro forma EPS:
Basic	$	1.77	$	0.23
Diluted	$	1.77	$	0.23

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Notes to Consolidated Financial Statements (Continued)

2015 Dispositions

In 2015, we completed dispositions of the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Disposition	Number of Buildings	Total Rentable Square Feet	Transaction Value (1)		Gain on Disposition
1550 Westbranch Drive	McLean, VA	Regional Office	7/27/2015	1	160,000	$	27,800	$	—
15000 and 15010 Conference Center Drive	Chantilly, VA	Northern VA Defense/IT	8/28/2015	2	665,000	167,335		—
13200 Woodland Park Road	Herndon, VA	Regional Office	10/27/2015	1	397,000	84,000		42,515
9900, 9910 and 9920 Franklin Square Drive	White Marsh, MD	Regional Office	11/9/2015	3	135,000	24,150		6,468
9690 Deereco Road and 375 W. Padonia Road	Timonium, MD	Regional Office	12/17/2015	2	240,000	44,500		15,050
				9	1,597,000	$	347,785	$	64,033

(1) Each of these properties were sold except for 15000 and 15010 Conference Center Drive, the disposition of which was completed in connection with a debt extinguishment, as discussed further below.

We also sold land in 2015 for $18.1 million and recognized gains of $4.0 million on the sales.

On August 28, 2015, ownership in 15000 and 15010 Conference Center Drive was transferred to the mortgage lender on a $150.0 million nonrecourse mortgage loan that was secured by the properties and we removed the debt obligation and accrued interest from our balance sheet. Upon completion of this transfer, we recognized a gain on early extinguishment of debt of $84.8 million, representing the difference between the mortgage loan and accrued interest payable extinguished over the carrying value of the properties transferred as of the transfer date and related closing costs.

2015 Construction Activities

In 2015, we placed into service an aggregate of 897,000 square feet in seven newly constructed office properties and 170,000 square feet in two redeveloped properties. As of December 31, 2015, we had nine office properties under construction, or for which we were contractually committed to construct, that we estimate will total 1.3 million square feet upon completion and four office properties under redevelopment that we estimate will total 156,000 square feet upon completion.

2014 Dispositions

In 2014, we completed dispositions of the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Sale	Number of Buildings	Total Rentable Square Feet	Transaction Value		Gain on Disposition
4969 and 4979 Mercantile Road	White Marsh, MD	Regional Office	7/14/2014	2	96,721	$	5,960	$	2,124
9930 and 9940 Franklin Square	White Marsh, MD	Regional Office	7/30/2014	2	71,992	10,475		2,303
5020, 5022, 5024 and 5026 Campbell Boulevard	White Marsh, MD	Regional Office	8/4/2014	4	134,245	12,400		666
				8	302,958	$	28,835	$	5,093

We also sold land in 2014 for $28.3 million and recognized gains of $5.6 million on the sales.

2014 Construction Activities

In 2014, we placed into service an aggregate of 692,000 square feet in five newly constructed office properties.

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Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

2013 Dispositions

 In 2013, we completed dispositions of the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Sale	Number of Buildings	Total Rentable Square Feet	Transaction Value (1)		Gain on Disposition
920 Elkridge Landing Road	Linthicum, MD	Fort Meade/BW Corridor	6/25/2013	1	103,000	$	6,900	$	—
4230 Forbes Boulevard	Lanham, MD	Regional Office	12/11/2013	1	56,000	5,600		1,507
December 2013 Colorado Springs Portfolio Disposition	Colorado Springs, CO	Colorado Defense/IT and Regional Office	12/12/2013	15	1,165,000	133,925		1,164
December 2013 Portfolio Conveyance	Colorado Springs, CO and Linthicum, MD	Various (2)	12/23/2013	14	1,021,000	146,876		—
				31	2,345,000	$	293,301	$	2,671

(1) Each of these properties were sold except for the December 2013 Portfolio Conveyance, the disposition of which was completed in connection with a debt extinguishment, as described further below.

(2) Included properties in our Fort Meade/BW Corridor, Colorado Defense/IT and Regional Office segments.

We also disposed of a non-operating property in 2013 for an aggregate transaction value of $3.5 million. In addition to the gains on dispositions reflected above, we recognized impairment losses on certain of these assets that are disclosed in Note 3.

On December 23, 2013, the mortgage lender on a $146.5 million nonrecourse mortgage loan that was secured by the December 2013 Portfolio Conveyance accepted a deed in lieu of foreclosure on the properties. As a result, we transferred title to the properties to the mortgage lender and we were relieved of the debt obligation plus accrued interest. Upon completion of this transfer, we recognized a gain on extinguishment of debt of $67.8 million, representing the excess of the mortgage loan and interest payable extinguished over the carrying values of the properties transferred as of the transfer date (which included the effect of previous impairment losses) and related closing costs.

2013 Construction Activities

In 2013, we placed into service an aggregate of 812,000 square feet in eight newly constructed office properties.

6.Real Estate Joint Ventures

Consolidated Real Estate Joint Ventures

The table below sets forth information pertaining to our investments in consolidated real estate joint ventures as of December 31, 2015 (dollars in thousands):

		Nominal
		Ownership		December 31, 2015				(1)
	Date	% as of		Total		Encumbered		Total
	Acquired	12/31/2015	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	147,612	$	82,721	$	54,022
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	56,455		48,245		37,568
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	5,284		—		393
				$	209,351	$	130,966	$	91,983

(1) Excludes amounts eliminated in consolidation.

(2) This joint venture’s property is in Huntsville, Alabama.

(3) This joint venture’s properties are in College Park, Maryland.

(4) This joint venture’s property is in Washington, DC.

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Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

With regard to our consolidated joint ventures:

• For LW Redstone, LLC, we anticipate funding certain infrastructure costs (up to a maximum of $76.0 million excluding accrued interest thereon) due to be reimbursed by the City of Huntsville as discussed further in Note 8; as of December 31, 2015, we had advanced $37.2 million to the City to fund such costs (excluding accrued interest; the aggregate amount outstanding under these notes, including accrued interest, was $44.9 million as of December 31, 2015 and is included in investing receivables on our consolidated balance sheets).  We also expect to fund additional development and construction costs through equity contributions to the extent that third party financing is not obtained.  Our partner was credited with a $9.0 million capital account upon formation and is not required to make any future equity contributions. While net cash flow distributions to the partners vary depending on the source of the funds distributed, cash flows are generally distributed as follows:

• cumulative preferred returns on capital invested to fund the project’s infrastructure costs on a pro rata basis to us and our partner;

• cumulative preferred returns on our capital invested to fund the project’s vertical construction;

• return of our invested capital;

• return of our partner’s capital;

• any remaining residual 85% to us and 15% to our partner.

Our partner has the right to require us to acquire its interest for fair value beginning in March 2020; accordingly, we classify the fair value of our partner’s interest as redeemable noncontrolling interests in the mezzanine section of our consolidated balance sheet. We have the right to purchase our partner’s interest at fair value upon the earlier of five years following the project’s achievement of a construction commencement threshold of 4.4 million square feet or March 2040; the project had achieved 594,000 square feet of construction commencement through December 31, 2015;

• For M Square Associates, LLC, net cash flows of this entity will be distributed to the partners as follows: (1) member loans and accrued interest; (2) our preferred return and capital contributions used to fund infrastructure costs; (3) the partners’ preferred returns and capital contributions used to fund all other costs, including the base land value credit, in proportion to the accrued returns and capital accounts; and (4) residual amounts distributed 50% to each member.

• For Stevens Investors, LLC, net cash flows of this entity will be distributed to the partners as follows: (1) member loans and accrued interest; (2) pro rata return of the partners’ capital; (3) pro rata return of the partners’ respective unpaid preferred returns; and (4) varying splits of 85% to 60% to us and the balance to our partners as we reach specified return hurdles. Our partners have the right to require us to acquire some or all of their interests for fair value for a defined period of time following the construction completion and stabilization (as defined in the operating agreement) of the joint venture’s office property; accordingly, we classify the fair value of our partners’ interest as redeemable noncontrolling interests in the mezzanine section of our consolidated balance sheet. Our partners have the right to receive some or all of the consideration for the acquisition of their interests in the form of common units in COPLP.

We disclose the activity of our redeemable noncontrolling interests in Note 12.

The ventures discussed above include only ones in which parties other than COPLP and COPT own interests.

During the periods included herein, we also owned investments in the following consolidated real estate joint ventures:

• Arundel Preserve #5, LLC, a joint venture owning property in Hanover, Maryland (in the Baltimore/Washington Corridor) and in which we had a 50% nominal ownership interest. On September 17, 2013, we acquired our partner’s noncontrolling interest, along with incremental additional land value in the venture, in exchange for 221,501 common units in COPLP valued at $5.2 million;

• MOR Forbes 2 LLC, a joint venture owning property in Lanham, Maryland (in the Baltimore/Washington Corridor) and in which we had a 50% nominal ownership interest. On December 11, 2013, the joint venture sold the property, after which the proceeds were distributed to the partners and there was substantially no remaining business operations or property; and

• COPT-FD Indian Head, LLC, a joint venture owning property in Charles County, Maryland (in our “Other” region). On August 7, 2014, the joint venture’s property was repurchased by Charles County under the terms of a development agreement for $6.4 million, after which the proceeds were distributed to the partners and there was no remaining business operations or assets.

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Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

We consolidate the real estate joint ventures described above because we have: (1) the power to direct the matters that most significantly impact the activities of the joint ventures, including development, leasing and management of the properties constructed by the VIEs; and (2) the right to receive returns on our fundings and, in many cases, the obligation to fund the activities of the ventures to the extent that third-party financing is not obtained, both of which could be potentially significant to the VIEs.

Our commitments and contingencies pertaining to our real estate joint ventures are disclosed in Note 20.

Unconsolidated Real Estate Joint Venture

We had a 20% ownership interest in an unconsolidated real estate joint venture that operated 16 operating properties, and in which we had a negative investment balance of $6.4 million as of December 31, 2012. We accounted for the investment in the joint venture using the equity method of accounting. On December 6, 2013, the holder of mortgage debt encumbering all of the joint venture’s properties foreclosed on the properties. As a result, title to the properties was transferred to the mortgage lender and the joint venture was relieved of the debt obligation. We recognized a gain on the substantive disposition of our investment in the joint venture in 2013 of $6.3 million, which is included in the line entitled “gain on sales of real estate, net of income taxes” on our consolidated statements of operations.

7.Intangible Assets on Real Estate Acquisitions

Intangible assets on real estate acquisitions consisted of the following (in thousands):

	December 31, 2015						December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net  Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
In-place lease value	$	134,664	$	89,540	$	45,124	$	123,759	$	101,040	$	22,719
Tenant relationship value	62,172		23,468		38,704		42,301		28,492		13,809
Below-market cost arrangements	15,102		6,692		8,410		12,415		5,984		6,431
Above-market leases	14,210		8,491		5,719		8,659		8,159		500
Other	1,333		952		381		1,333		938		395
	$	227,481	$	129,143	$	98,338	$	188,467	$	144,613	$	43,854

Amortization of the intangible asset categories set forth above totaled $18.5 million in 2015, $15.2 million in 2014 and $16.2 million in 2013. The approximate weighted average amortization periods of the categories set forth above follow: in-place lease value: six years; tenant relationship value: 11 years; below-market cost arrangements: 35 years; above-market leases: four years; and other: 27 years. The approximate weighted average amortization period for all of the categories combined is eleven years. The estimated amortization (to amortization associated with real estate operations, rental revenue and property operating expenses) associated with the intangible asset categories set forth above for the next five years is: $18.8 million for 2016; $16.3 million for 2017; $11.6 million for 2018; $8.8 million for 2019; and $7.0 million for 2020.

8.     Investing Receivables

Investing receivables, including accrued interest thereon, consisted of the following (in thousands):

	December 31,
	2015		2014
Notes receivable from City of Huntsville	$	44,875	$	49,147
Other investing loans receivable	3,000		3,000
	$	47,875	$	52,147

Our notes receivable from the City of Huntsville funded infrastructure costs in connection with our LW Redstone Company, LLC joint venture (see Note 6) and carry an interest rate of 9.95%. These notes and the accrued and unpaid interest thereon, which is compounded annually on March 1st, will be repaid using the real estate taxes generated by the properties constructed by the joint venture. When these tax revenues are sufficient to cover the debt service on a certain increment of municipal

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Notes to Consolidated Financial Statements (Continued)

bonds, the City of Huntsville will be required to issue bonds to repay the notes receivable and the accrued and unpaid interest thereon. Each note has a maturity date of the earlier of 30 years from the date issued or the expiration of the tax increment district comprising the constructed properties in 2045.

We did not have an allowance for credit losses in connection with our investing receivables as of December 31, 2015 or December 31, 2014.  The fair value of these receivables approximated their carrying amounts as of December 31, 2015 and December 31, 2014.

9.    Prepaid Expenses and Other Assets, Net

Prepaid expenses and other assets, net consisted of the following (in thousands):

	December 31,
	2015		2014
Prepaid expenses	$	23,009	$	20,570
Lease incentives	11,133		13,344
Furniture, fixtures and equipment, net	6,004		6,637
Deferred financing costs, net (1)	5,867		4,849
Deferred tax asset, net	3,467		4,002
Construction contract costs incurred in excess of billings	3,261		6,656
Equity method investments	1,636		2,368
Other assets	5,647		2,875
Prepaid expenses and other assets, net	$	60,024	$	61,301

(1) Represents deferred costs, net of accumulated amortization, attributable to our Revolving Credit Facility and interest rate derivatives.

Deferred tax asset, net reported above includes the following tax effects of temporary differences and carry forwards of our TRS (in thousands):

	December 31,
	2015			2014
Operating loss carry forward	$	5,065		$	5,012
Share-based compensation	363			976
Accrued payroll	133			195
Property	(32		)	(119		)
Valuation allowance	(2,062		)	(2,062		)
Deferred tax asset, net	$	3,467		$	4,002

We recognize a valuation allowance on our deferred tax asset if we believe all or some portion of the asset may not be realized. An increase or decrease in the valuation allowance resulting from a change in circumstances that causes a change in our judgment about the realizability of our deferred tax asset is included in income. The deferred tax asset valuation allowance is due to a decrease in future projected operating income in our TRS resulting primarily from our dispositions of certain properties to which the TRS provided amenity services and our planned reduction in amenity services provided by the TRS at certain other properties. We believe it is more likely than not that the results of future operations in our TRS will generate sufficient taxable income to realize our December 31, 2015 net deferred tax asset.

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Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

10.    Debt

Debt Summary

Our debt consisted of the following (dollars in thousands):

	Carrying Value (1) as of
	December 31, 2015		December 31, 2014		Stated Interest Rates as of	Scheduled Maturity as of
					December 31, 2015	December 31, 2015
Mortgage and Other Secured Loans:
Fixed rate mortgage loans (2)	$	281,208	$	385,769	3.96% - 7.87% (3)	2016-2024
Variable rate secured loans	49,792		36,698		LIBOR + 1.85% - 2.00% (4)	2016-2020
Total mortgage and other secured loans	331,000		422,467
Revolving Credit Facility (5)	43,500		83,000		LIBOR + 0.875% to 1.60%	May 2019
Term Loan Facilities (6)	515,902		517,846		LIBOR + 0.90% to 2.60% (7)	2019-2022
Unsecured Senior Notes (5)
3.600%, $350,000 aggregate principal	346,714		346,311		3.60% (8)	May 2023
5.250%, $250,000 aggregate principal	245,731		245,306		5.25% (9)	February 2024
3.700%, $300,000 aggregate principal	297,378		296,927		3.70% (10)	June 2021
5.000%, $300,000 aggregate principal	296,019		—		5.00% (10)	July 2025
Unsecured notes payable	1,508		1,607		0% (11)	2026
4.25% Exchangeable Senior Notes (12)	—		572		N/A	N/A
Total debt	$	2,077,752	$	1,914,036

(1) The carrying values of our loans other than the Revolving Credit Facility reflect net deferred financing costs of $8.0 million as of December 31, 2015 and $6.0 million as of December 31, 2014.

(2)   Several of the fixed rate mortgages carry interest rates that were above or below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates.  The carrying values of these loans reflect net unamortized premiums totaling $514,000 as of December 31, 2015 and $42,000 as of December 31, 2014.

(3) The weighted average interest rate on our fixed rate mortgage loans was 6.08% as of December 31, 2015.

(4)  The weighted average interest rate on our variable rate secured loans was 2.2% as of December 31, 2015.

(5) Refer to the paragraphs below for further disclosure.

(6)   As discussed below, an additional $150.0 million in borrowings is available to be drawn under a term loan entered into in the current year. In addition, we have the ability to borrow an additional $430.0 million in the aggregate under these term loan facilities, provided that there is no default under the facilities and subject to the approval of the lenders.

(7)  The weighted average interest rate on these loans was 1.92% as of December 31, 2015.

(8)   The carrying value of these notes reflects an unamortized discount totaling $2.2 million as of December 31, 2015 and $2.5 million as of December 31, 2014. The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%.

(9)   The carrying value of these notes reflects an unamortized discount totaling $3.8 million as of December 31, 2015 and $4.2 million as of December 31, 2014. The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%.

(10) Refer to the paragraphs below for further disclosure.

(11)  These notes carry interest rates that were below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates.  The carrying value of these notes reflects an unamortized discount totaling $554,000 as of December 31, 2015 and $654,000 as of December 31, 2014.

(12) On April 20, 2015, we redeemed the remaining $575,000 principal amount of these notes at 100% of their principal amount. The carrying value of these notes as of December 31, 2014 included an unamortized discount totaling $3,000. 

All debt is owed by the Operating Partnership. While COPT is not directly obligated by any debt, it has guaranteed the Operating Partnership’s Revolving Credit Facility, Term Loan Facilities and Unsecured Senior Notes.

Certain of our debt instruments require that we comply with a number of restrictive financial covenants, including maximum leverage ratio, unencumbered leverage ratio, minimum net worth, minimum fixed charge coverage, minimum unencumbered interest coverage ratio, minimum debt service and maximum secured indebtedness ratio. In addition, the terms of some of COPLP’s debt may limit its ability to make certain types of payments and other distributions to COPT in the event of default or when such payments or distributions may prompt failure of debt covenants.  As of December 31, 2015, we were within the compliance requirements of these financial covenants.

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Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

Our debt matures on the following schedule (in thousands):

2016	$	208,109
2017	3,252
2018	3,400
2019	167,014		(1)
2020	315,252
Thereafter	1,400,203
Total	$	2,097,230	(2)

(1)    Includes $43.5 million in 2019 that may be extended to 2020 at our option, subject to certain conditions.

(2)     Represents scheduled principal amortization and maturities only and therefore excludes net discounts and deferred financing costs of $19.5 million.

We capitalized interest costs of $7.2 million in 2015, $6.1 million in 2014 and $8.8 million in 2013.

The following table sets forth information pertaining to the fair value of our debt (in thousands):

	December 31, 2015				December 31, 2014
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Fixed-rate debt
Unsecured Senior Notes	$	1,185,842	$	1,211,658	$	888,544	$	901,599
Other fixed-rate debt	282,716		291,991		387,948		356,377
Variable-rate debt	609,194		610,987		637,544		642,091
	$	2,077,752	$	2,114,636	$	1,914,036	$	1,900,067

Revolving Credit Facility

On May 6, 2015, we entered into a credit agreement with a group of lenders for which KeyBanc Capital Markets and J.P. Morgan Securities LLC acted as joint lead arrangers and joint book runners, KeyBank National Association acted as administrative agent and JPMorgan Chase Bank, N.A. acted as syndication agent (the “Consolidated Credit Agreement”) to amend, restate and consolidate the terms of our existing unsecured revolving credit facility (the “Revolving Credit Facility”) and one of our term loan facilities discussed below. The lenders’ aggregate commitment under the Revolving Credit Facility is $800.0 million, with the ability for us to increase the lenders’ aggregate commitment to $1.3 billion, provided that there is no default under the facility and subject to the approval of the lenders. Amounts available under the facility are computed based on 60% of our unencumbered asset value, as defined in the agreement.  The facility matures on May 6, 2019, with the ability for us to further extend such maturity by twosix-month periods at our option, provided that there is no default under the facility and we pay an extension fee of 0.075% of the total availability under the facility for each extension period. The interest rate on the facility is based on LIBOR (customarily the 30-day rate) plus 0.875% to 1.600%, as determined by the credit ratings assigned to COPLP by Standard & Poor’s Rating Services, Moody’s Investor Services, Inc. or Fitch Ratings Ltd. (collectively, the “Ratings Agencies”). The facility also carries a quarterly fee that is based on the lenders’ aggregate commitment under the facility multiplied by a per annum rate of 0.125% to 0.300%, as determined by the credit ratings assigned to COPLP by the Ratings Agencies. As of December 31, 2015, the maximum borrowing capacity under this facility totaled $800.0 million, of which $741.7 million was available.

Weighted average borrowings under our Revolving Credit Facility totaled $125.0 million in 2015 and $15.9 million in 2014. The weighted average interest rate on our Revolving Credit Facility was 1.40% in 2015 and 1.47% in 2014.

Term Loan Facilities

Effective February 14, 2012, we entered into an unsecured term loan agreement under which we borrowed $250.0 million. In connection with our entry into the Consolidated Credit Agreement on May 6, 2015 discussed above, we increased the loan amount to $300.0 million, with a right for us to borrow up to an additional $200.0 million during the term for an aggregate maximum loan of $500.0 million, subject to certain conditions. The term loan matures on May 6, 2020.  The variable interest rate on the loan is based on the LIBOR rate (customarily the 30-day rate) plus 0.90% to 1.85%, as determined by the credit ratings assigned to COPLP by the Ratings Agencies.

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Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

Effective August 3, 2012, we entered into an unsecured term loan agreement under which we borrowed $120.0 million, with the ability for us to borrow an additional $80.0 million, provided that there is no default under the loan and subject to the approval of the lenders.  The term loan matures on August 2, 2019.  The variable interest rate on the loan is based on the LIBOR rate (customarily the 30-day rate) plus 2.10% to 2.60%, as determined by our leverage levels.

Effective December 17, 2015, we entered into an unsecured term loan agreement with an initial commitment of $250.0 million, of which we borrowed $100.0 million. We have until September 2016 to draw the remaining initial commitment. We also have the ability to borrow $150.0 million above the initial commitment, provided that there is no default under the loan and subject to the approval of the lenders.  The term loan matures on December 17, 2022.  The variable interest rate on the loan is based on the LIBOR rate (customarily the 30-day rate) plus 1.40% to 2.35%, as determined by our leverage levels.

We also had an unsecured term loan agreement under which we borrowed $400.0 million in 2011. In 2013, we amended this term loan and repaid $150.0 million of the loan balance. We repaid the loan balance by an additional $100.0 million in 2014 and repaid the remaining balance in 2015.

Unsecured Senior Notes

We issued the following senior notes in 2014 and 2015:

• $300.0 million of 3.700% Senior Notes at an initial offering price of 99.739% of their face value on May 14, 2014, resulting in proceeds, after deducting underwriting discounts, but before other offering expenses, of $297.3 million. The carrying value of these notes reflects an unamortized discount totaling $2.1 million as of December 31, 2015 and $2.4 million as of December 31, 2014. The effective interest rate under the notes, including amortization of the issuance costs, was 3.85%; and

• $300.0 million of 5.000% Senior Notes at an initial offering price of 99.510% of their face value on June 29, 2015, resulting in proceeds, after deducting underwriting discounts, but before other offering expenses of $296.6 million. The carrying value of these notes reflects an unamortized discount totaling $3.3 million at December 31, 2015. The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

We may redeem our unsecured senior notes, in whole at any time or in part from time to time, at our option, at a redemption price equal to the greater of (1) the aggregate principal amount of the notes being redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest thereon (not including any portion of such payments of interest accrued as of the date of redemption) discounted to its present value, on a semi-annual basis at an adjusted treasury rate plus a spread (30 basis points for the 3.600% Senior Notes, 40 basis points for the 5.250% Senior Notes, 25 basis points for the 3.700% Senior Notes and 45 basis points for the 5.000% Senior Notes), plus, in each case, accrued and unpaid interest thereon to the date of redemption. However, in each case, if this redemption occurs on or after three months prior to the maturity date, the redemption price will be equal to 100% of the principal amount of the notes being redeemed, plus accrued and unpaid interest thereon to, but not including, the applicable redemption date. These notes are unconditionally guaranteed by COPT.

Gains (Losses) on Early Extinguishment of Debt

Our gains (losses) on early extinguishment of debt in 2013, 2014 and 2015 included the following:

• a gain of $67.8 million on December 23, 2013 resulting from our transfer of title to properties to the lender on a $146.5 million nonrecourse mortgage loan and being relieved of the debt obligation plus accrued interest as discussed further in Note 5;

• a loss of $25.9 million in 2013 resulting from early repayment of $239.4 million principal amount of 4.25% Exchangeable Senior Notes;

• a loss of $9.1 million in December 2014, when we completed the defeasance of, and full satisfaction of our obligations with respect to, (1) $103.0 million principal amount of secured nonrecourse mortgage loan due to mature on November 6, 2015 and bearing an interest rate of 5.53% and (2) $108.5 million principal amount of secured nonrecourse mortgage loan due to mature on January 1, 2016 and bearing an interest rate of 5.56%, as well as costs related to the defeasance and satisfaction; and

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Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

• a gain of $84.8 million on August 28, 2015 pertaining to the removal of a $150.0 million nonrecourse mortgage loan from our balance sheet as discussed further in Note 5.

11.    Interest Rate Derivatives

The following table sets forth the key terms and fair values of our interest rate swap derivatives (dollars in thousands):

								Fair Value at
Notional						Effective	Expiration	December 31,
Amount			Fixed Rate		Floating Rate Index	Date	Date	2015			2014
$	100,000		0.8055	%	One-Month LIBOR	9/2/2014	9/1/2016	$	(148	)	$	(317	)
100,000			0.8100	%	One-Month LIBOR	9/2/2014	9/1/2016	(151		)	(324		)
100,000			1.6730	%	One-Month LIBOR	9/1/2015	8/1/2019	(1,217		)	239
100,000			1.7300	%	One-Month LIBOR	9/1/2015	8/1/2019	(1,429		)	35
13,941		(1)	1.3900	%	One-Month LIBOR	10/13/2015	10/1/2020	53			—
100,000			1.9013	%	One-Month LIBOR	9/1/2016	12/1/2022	(138		)	—
100,000			1.9050	%	One-Month LIBOR	9/1/2016	12/1/2022	(45		)	—
50,000			1.9079	%	One-Month LIBOR	9/1/2016	12/1/2022	(32		)	—
36,200		-1	3.8300	%	One-Month LIBOR + 2.25%	11/2/2010	11/2/2015	—			(400		)
100,000			0.8320	%	One-Month LIBOR	1/3/2012	9/1/2015	—			(407		)
100,000			0.8320	%	One-Month LIBOR	1/3/2012	9/1/2015	—			(407		)
								$	(3,107	)	$	(1,581	)

(1) The notional amount of this instrument is scheduled to amortize to $12.1 million.

Each of the one-month LIBOR interest rate swaps set forth in the table above was designated as a cash flow hedge of interest rate risk.

The table below sets forth the fair value of our interest rate derivatives as well as their classification on our consolidated balance sheets (in thousands):

		Fair Value at
		December 31,
Derivatives	Balance Sheet Location	2015			2014
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets	$	53		$	274
Interest rate swaps designated as cash flow hedges	Interest rate derivatives	(3,160		)	(1,855		)

The table below presents the effect of our interest rate derivatives on our consolidated statements of operations and comprehensive income (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Amount of (losses) gains recognized in accumulated other comprehensive income (loss) (“AOCI”) (effective portion)	$	(4,739	)	$	(7,799	)	$	6,791
Amount of losses reclassified from AOCI into interest expense (effective portion)	3,599			2,990			2,740
Amount of loss recognized in interest expense (ineffective portion)	386			—			—
Amount of loss reclassified from AOCI into loss on early extinguishment of debt	—			38			—

Over the next 12 months, we estimate that approximately $3.3 million of losses will be reclassified from AOCI as an increase to interest expense.

We have agreements with each of our interest rate derivative counterparties that contain provisions under which, if we default or are capable of being declared in default on defined levels of our indebtedness, we could also be declared in default on

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Notes to Consolidated Financial Statements (Continued)

our derivative obligations.  These agreements also incorporate the loan covenant provisions of our indebtedness with a lender affiliate of the derivative counterparties.  Failure to comply with the loan covenant provisions could result in our being declared in default on any derivative instrument obligations covered by the agreements.  As of December 31, 2015, the fair value of interest rate derivatives in a liability position related to these agreements was $3.2 million, excluding the effects of accrued interest and credit valuation adjustments. As of December 31, 2015, we had not posted any collateral related to these agreements.  We are not in default with any of these provisions.  If we breached any of these provisions, we could be required to settle our obligations under the agreements at their termination value of $3.6 million.

12.    Redeemable Noncontrolling Interests

The table below sets forth the activity in redeemable noncontrolling interests in our LW Redstone, LLC and Stevens Investors, LLC joint ventures described in Note 6 (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Beginning balance	$	18,417		$	17,758		$	10,298
Contributions from noncontrolling interests	1,654			—			—
Distributions to noncontrolling interests	(2,964		)	(1,369		)	(1,037		)
Net income attributable to noncontrolling interests	2,227			2,162			1,376
Adjustment to arrive at fair value of interests	(116		)	(134		)	7,121
Ending balance	$	19,218		$	18,417		$	17,758

13.    Equity - COPT and Subsidiaries

Preferred Shares

As of December 31, 2015, COPT had 25.0 million preferred shares authorized at $0.01 par value per share. The table below sets forth additional information pertaining to COPT’s outstanding preferred shares (dollars in thousands, except per share data):

Series	# of Shares Issued	Aggregate Liquidation Preference		Month of Issuance	Annual Dividend Yield		Annual Dividend Per Share		Earliest Redemption Date
Series K	531,667	$	26,583	January 2007	5.600	%	$	2.80000	1/9/2017
Series L	6,900,000	172,500		June 2012	7.375	%	$	1.84375	6/27/2017
	7,431,667	$	199,083

Each series of preferred shares is nonvoting and redeemable for cash in the amount of its liquidation preference at COPT’s option on or after the earliest redemption date. The Series K Cumulative Redeemable Preferred Shares are also convertible, subject to certain conditions, into common shares on the basis of 0.8163 common shares for each preferred share. Holders of all preferred shares are entitled to cumulative dividends, payable quarterly (as and if declared by the Board of Trustees). In the case of each series of preferred shares, there is a series of COPLP preferred units owned by COPT that carries substantially the same terms.

COPT redeemed all of the outstanding shares of its 7.500% Series H Preferred Shares on June 16, 2014 at a price of $25.00 per share, or $50.0 million in the aggregate, plus accrued and unpaid dividends thereon through the date of redemption, and recognized a $1.8 million decrease to net income available to common shareholders pertaining to the shares’ original issuance costs incurred at the time of the redemption.

Common Shares

COPT completed the public offering of 5.52 million common shares in November 2014 at an offering price of $27.30 per share for net proceeds of $148.9 million after underwriter discounts but before offering expenses. COPT contributed the net proceeds from this issuance to COPLP in exchange for an equal number of units in COPLP.

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Notes to Consolidated Financial Statements (Continued)

In October 2012, COPT established an at-the-market (“ATM”) stock offering program under which it may, from time to time, offer and sell common shares in “at the market” stock offerings having an aggregate gross sales price of up to $150.0 million. Through December 31, 2015, COPT issued the following common shares under the program:

• 1.5 million shares on July 15, 2013 at a weighted average price of $26.05 per share. Net proceeds from the shares issued totaled $38.5 million, after payment of $0.6 million in commissions to sales agents; and

• 890,241 common shares issued in 2015 at a weighted average price of $30.29 per share. Net proceeds from the shares issued totaled $26.6 million, after payment of $0.4 million in commissions to sales agents.

COPT contributed the net proceeds from these issuances to COPLP in exchange for an equal number of units in COPLP. COPT’s remaining capacity under the ATM Plan is an aggregate gross sales price of $84.0 million in common share sales.

Holders of COPLP common units converted their units into COPT common shares on the basis of one common share for each common unit in the amount of 160,160 in 2015, 140,149 in 2014 and 311,343 in 2013.

COPT declared dividends per common share of $1.10 in 2015, 2014 and 2013.

See Note 15 for disclosure of common share activity pertaining to our share-based compensation plans.

14.    Equity - COPLP and Subsidiaries

General Partner Preferred Units

The table below sets forth information pertaining to preferred units in COPLP held by COPT at December 31, 2015 (dollars in thousands, except per unit data):

Series	# of Units Issued	Aggregate Liquidation Preference		Month of Issuance	Annual Distribution Yield		Annual Distribution Per Unit		Earliest Redemption Date
Series K	531,667	$	26,583	January 2007	5.600	%	$	2.80000	1/9/2017
Series L	6,900,000	172,500		June 2012	7.375	%	$	1.84375	6/27/2017
	7,431,667	$	199,083

In the case of each series of preferred units, COPT had preferred shares that carry substantially the same terms. Each series of preferred units are redeemable for cash in the amount of its liquidation preference at our option on or after the earliest redemption date. The Series K Preferred Units are also convertible, subject to certain conditions, into common units on the basis of 0.8163 common units for each preferred unit. COPT, as holder of these preferred units, is entitled to cumulative distributions, payable quarterly (as and if declared by the Board of Trustees).

COPLP redeemed all of the outstanding units of its 7.500% Series H Preferred Units held by COPT on June 16, 2014 at a price of $25.00 per unit, or $50.0 million in the aggregate, plus accrued and unpaid distributions thereon through the date of redemption, and recognized a $1.8 million decrease to net income available to common unitholders pertaining to the units’ original issuance costs at the time of the redemption.

Limited Partner Preferred Units

COPLP has 352,000 Series I Preferred Units issued to an unrelated party that have an aggregate liquidation preference of $8.8 million ($25.00 per unit), plus any accrued and unpaid distributions of return thereon (as described below), and may be redeemed for cash by COPLP at COPLP’s option any time after September 22, 2019. The owner of these units is entitled to a priority annual cumulative return equal to 7.5% of their liquidation preference through September 22, 2019; the annual cumulative preferred return increases for each subsequent five-year period, subject to certain maximum limits. These units are convertible into common units on the basis of 0.5 common units for each Series I Preferred Unit; the resulting common units would then be exchangeable for COPT common shares in accordance with the terms of COPLP’s agreement of limited partnership.

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Notes to Consolidated Financial Statements (Continued)

Common Units

COPT owned 96.3% of COPLP’s common units as of December 31, 2015 and 96.0% as of December 31, 2014.

COPT acquired additional common units through the public offering of 5.52 million common shares in November 2014 at an offering price of $27.30 per share for net proceeds of $148.9 million (after underwriter discounts but before offering expenses) that were contributed to COPLP in exchange for an equal number of common units in COPLP.

Through December 31, 2015, COPT issued the following common shares under the ATM program:

• 1.5 million common shares on July 15, 2013 at a weighted average price of $26.05 per share. Net proceeds from the shares issued totaled $38.5 million, after payment of $0.6 million in commissions to sales agents; and

• 890,241 common shares in 2015 at a weighted average price of $30.29 per share; net proceeds from the shares issued totaled $26.6 million, after payment of $0.4 million in commissions to sales agents.

COPT contributed the net proceeds from these issuances to COPLP in exchange for an equal number of units in COPLP.

Limited partners in COPLP holding common units have the right to require COPLP to redeem all or a portion of their common units. COPLP (or COPT as the general partner) has the right, in its sole discretion, to deliver to such redeeming limited partners for each partnership unit either one COPT common share (subject to anti-dilution adjustment) or a cash payment equal to the then fair market value of such share (so adjusted) (based on the formula for determining such value set forth in the partnership agreement). Limited partners holding common units redeemed their units into common shares on the basis of one common share for each common unit in the amount of 160,160 in 2015, 140,149 in 2014 and 311,343 in 2013.

We declared distributions per common unit of $1.10 in 2015, 2014 and 2013.

15.    Share-Based Compensation and Other Compensation Matters

Share-Based Compensation Plans

In May 2010, COPT adopted the Amended and Restated 2008 Omnibus Equity and Incentive Plan. COPT may issue equity-based awards under this plan to officers, employees, non-employee trustees and any other key persons of us and our subsidiaries, as defined in the plan. The plan provides for a maximum of 5.9 million common shares in COPT to be issued in the form of options, share appreciation rights, deferred share awards, restricted share awards, unrestricted share awards, performance shares, dividend equivalent rights and other equity-based awards and for the granting of cash-based awards. The plan expires on May 13, 2020.

In March 1998, COPT adopted a long-term incentive plan for our Trustees and employees. This plan, which expired in March 2008, provided for the award of options, restricted shares and dividend equivalents.

Awards under these plans to nonemployee Trustees generally vest on the first anniversary of the grant date provided that the Trustee remains in his or her position. Awards granted to employees vest based on increments and over periods of time set forth under the terms of the respective awards provided that the employees remain employed by us. Options expire ten years after the date of grant. Shares for each of the share-based compensation plans are issued under registration statements on Form S-8 that became effective upon filing with the Securities and Exchange Commission. In connection with awards of common shares granted by COPT under such share-based compensation plans, COPLP issues to COPT an equal number of equity instruments with identical terms.

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Notes to Consolidated Financial Statements (Continued)

The following table summarizes restricted shares under the share-based compensation plans for 2013, 2014 and 2015:

	Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2012	434,643		$	29.67
Granted	193,833		25.91
Forfeited	(9,541	)	27.59
Vested	(241,487	)	30.97
Unvested at December 31, 2013	377,448		26.96
Granted	216,607		26.73
Forfeited	(21,335	)	25.10
Vested	(182,213	)	28.56
Unvested at December 31, 2014	390,507		26.19
Granted	201,024		28.69
Forfeited	(10,550	)	26.05
Vested	(202,781	)	26.07
Unvested at December 31, 2015	378,200		$	27.58
Unvested shares as of December 31, 2015 that are expected to vest	364,666		$	27.61

The aggregate intrinsic value of restricted shares that vested was $4.9 million in 2015, $4.9 million in 2014 and $6.3 million in 2013.

We made the following grants of PSUs to executives from 2011 through 2015 (dollars in thousands):

Grant Date	Number of PSUs Granted	Performance Period Commencement Date	Performance Period End Date	Grant Date Fair Value		Number of PSUs Outstanding as of December 31, 2015
3/3/2011	56,883	3/3/2011	3/2/2014	$	2,796	—
3/1/2012	54,070	1/1/2012	12/31/2014	1,772		—
3/1/2013	69.579	1/1/2013	12/31/2015	1,867		51,556
3/6/2014	49,103	1/1/2014	12/31/2016	1,723		37,843
3/5/2015	45,656	1/1/2015	12/31/2017	1,678		45,656

The PSUs each have three year performance periods concluding on the earlier of the respective performance period end dates set forth above or the date of: (1) termination by us without cause, death or disability of the executive or constructive discharge of the executive (collectively, “qualified termination”); or (2) a sale event.  The number of PSUs earned (“earned PSUs”) at the end of the performance period will be determined based on the percentile rank of COPT’s total shareholder return relative to a peer group of companies, as set forth in the following schedule:

Percentile Rank	Earned PSUs Payout %
75th or greater	200% of PSUs granted
50th or greater	100% of PSUs granted
25th	50% of PSUs granted
Below 25th	0% of PSUs granted

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Notes to Consolidated Financial Statements (Continued)

If the percentile rank exceeds the 25th percentile and is between two of the percentile ranks set forth in the table above, then the percentage of the earned PSUs will be interpolated between the ranges set forth in the table above to reflect any performance between the listed percentiles.  At the end of the performance period, we, in settlement of the award, will issue a number of fully-vested COPT common shares equal to the sum of:

• the number of earned PSUs in settlement of the award plan; plus

• the aggregate dividends that would have been paid with respect to the common shares issued in settlement of the earned PSUs through the date of settlement had such shares been issued on the grant date, divided by the share price on such settlement date, as defined under the terms of the agreement.

If a performance period ends due to a sale event or qualified termination, the number of earned PSUs is prorated based on the portion of the three-year performance period that has elapsed.  If employment is terminated by the employee or by us for cause, all PSUs are forfeited.  PSUs do not carry voting rights.

Based on COPT’s total shareholder return relative to its peer group of companies:

• for the 2011 PSUs that vested in 2014, there was no payout value in connection with the vesting;

• for the 2012 PSUs that vested in 2014, we issued 40,309 common shares in settlement of the PSUs on March 5, 2015;

• for 2013 and 2014 PSUs issued to Mr. Stephen E. Riffee, our former Chief Financial Officer who departed on February 3, 2015, we issued 15,289 common shares on March 5, 2015 in settlement of such PSUs; and

• for the 2013 PSUs that vested on December 31, 2015, there was no payout value in connection with the vesting.

We computed grant date fair values for PSUs using Monte Carlo models and are recognizing these values over three-year periods that commenced on the respective grant dates. The grant date fair value and certain of the assumptions used in the Monte Carlo models for the PSUs granted in 2013, 2014 and 2015 are set forth below:

	For the Years Ended December 31,
	2015			2014			2013
Grant date fair value	$	36.76		$	35.09		$	26.84
Baseline common share value	$	29.28		$	26.52		$	25.85
Expected volatility of common shares	19.9		%	28.6		%	29.5		%
Risk-free interest rate	0.99		%	0.66		%	0.33		%

In 2015, nonemployee members of our Board of Trustees were granted a total of 24,056 deferred share awards with an aggregate grant date fair value of $642,000 ($26.70 per share). Deferred share awards vest on the first anniversary of the grant date, provided that the Trustee remains in his or her position. We settle deferred share awards by issuing an equivalent number of common shares upon vesting of the awards or a later date elected by the Trustee (generally upon cessation of being a Trustee). In 2015, we issued 15,485 common shares in settlement of deferred share awards granted in 2014; these shares had a grant date fair value of $26.77 per share, and the aggregate intrinsic value of the shares on the settlement date was $413,000.

We have not issued options since 2009, and all of our options were vested and fully expensed as of December 31, 2015. The table below sets forth information regarding our outstanding options (dollars in thousands, except per share data):

	Options Outstanding and Exercisable	Weighted Average Exercise Price Per Share	Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
December 31, 2012	798,210	$37.62	3	$	325
December 31, 2013	640,927	$38.11	2	$	68
December 31, 2014	559,736	$39.60	2	$	167
December 31, 2015	425,347	$42.75	1	$	—

The aggregate intrinsic value of options exercised was $300,000 in 2015, $225,000 in 2014 and $258,000 in 2013.

We own a taxable REIT subsidiary that is subject to Federal and state income taxes. We realized a windfall tax loss of $513,000 in 2015, $3,000 in 2014 and $122,000 in 2013 on options exercised and vesting restricted shares in connection with employees of that subsidiary.

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Notes to Consolidated Financial Statements (Continued)

The table below sets forth our reporting for share based compensation cost (in thousands):

	For the Years Ended December 31,
	2015		2014		2013
General, administrative and leasing expenses	$	5,574	$	5,307	$	5,412
Property operating expenses	1,000		857		1,118
Capitalized to development activities	824		886		1,075
Share-based compensation cost	$	7,398	$	7,050	$	7,605

The amounts included in our consolidated statements of operations for share-based compensation reflected an estimate of pre-vesting forfeitures of 0% for PSUs and deferred share awards and 0% to 5% for restricted shares.

As of December 31, 2015, unrecognized compensation costs related to unvested awards included:

• $6.3 million on restricted shares expected to be recognized over a weighted average period of approximately two years;

• $1.7 million on PSUs expected to be recognized over a weighted average performance period of approximately two years and

• $223,000 on deferred share awards expected to be recognized through May 2016.

16.    Operating Leases

We lease our properties to tenants under operating leases with various expiration dates extending to the year 2030. Gross minimum future rentals on noncancelable leases in our properties as of December 31, 2015 were as follows (in thousands):

Year Ending December 31,
2016	$	378,780
2017	349,192
2018	278,714
2019	218,977
2020	154,207
Thereafter	433,892
	$	1,813,762

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Notes to Consolidated Financial Statements (Continued)

17.    Information by Business Segment

Effective in the quarter ended December 31, 2015, we changed the reportable segments that we use to review operating results and make decisions regarding segment performance and resource allocation. Given the changes in our portfolio resulting from development, acquisition and disposition activities, we made this change to better align our segments with our business strategy by contemplating the market characteristics of our properties. Our new segment reporting includes the following segments: Defense/IT Locations; Regional Office; our operating wholesale data center; and other. Our segment reporting also includes reporting for Defense/IT Locations sub-segments, which include the following: Fort George G. Meade and the Baltimore/Washington Corridor (referred to herein as “Fort Meade/BW Corridor”); Northern Virginia Defense/IT Locations; Lackland Air Force Base (in San Antonio); locations serving the U.S. Navy ( “Navy Support Locations”), which included properties proximate to the Washington Navy Yard, the Naval Air Station Patuxent River in Maryland and the Naval Surface Warfare Center Dahlgren Division in Virginia); Redstone Arsenal (in Huntsville); Colorado Defense/IT Locations; and data center shells (properties leased to tenants to be operated as data centers in which the tenants generally fund the costs for the power, fiber connectivity and data center infrastructure). The table below reports segment financial information for our reportable segments (in thousands).  We measure the performance of our segments through the measure we define as NOI from real estate operations, which is derived by subtracting property operating expenses from revenues from real estate operations.

	Operating Office Property Segments
	Defense/Information Technology Locations
	Fort Meade/BW Corridor		Northern Virginia Defense/IT		Lackland Air Force Base		Navy Support Locations		Redstone Arsenal		Colorado Defense/IT		Data Center Shells		Total Defense/IT Locations		Regional Office		Operating Wholesale Data Center		Other			Total
Year Ended December 31, 2015
Revenues from real estate operations	$	244,274	$	49,199	$	39,659	$	28,177	$	11,228	$	—	$	21,746	$	394,283	$	98,165	$	19,032	$	7,588		$	519,068
Property operating expenses	83,309		20,107		22,004		13,229		3,497		—		2,298		144,444		36,165		10,402		3,477			194,488
NOI from real estate operations	$	160,965	$	29,092	$	17,655	$	14,948	$	7,731	$	—	$	19,448	$	249,839	$	62,000	$	8,630	$	4,111		$	324,580
Additions to long-lived assets	$	31,883	$	90,248	$	—	$	7,656	$	883	$	—	$	—	$	130,670	$	204,139	$	132	$	328		$	335,269
Transfers from non-operating properties	$	45,560	$	50,690	$	32,307	$	1,408	$	13,190	$	—	$	51,492	$	194,647	$	22,313	$	89,745	$	415		$	307,120
Segment assets at December 31, 2015	$	1,290,028	$	411,196	$	134,381	$	196,090	$	108,038	$	—	$	203,013	$	2,342,746	$	608,471	$	243,338	$	70,914		$	3,265,469
Year Ended December 31, 2014
Revenues from real estate operations	$	233,764	$	48,313	$	34,463	$	31,335	$	10,446	$	—	$	18,421	$	376,742	$	85,025	$	10,430	$	7,514		$	479,711
Property operating expenses	80,824		19,071		19,677		12,576		3,066		—		2,272		137,486		31,427		7,286		3,600			179,799
NOI from real estate operations	$	152,940	$	29,242	$	14,786	$	18,759	$	7,380	$	—	$	16,149	$	239,256	$	53,598	$	3,144	$	3,914		$	299,912
Additions to long-lived assets	$	24,173	$	7,119	$	—	$	10,010	$	4,077	$	—	$	—	$	45,379	$	19,290	$	22	$	(90	)	$	64,601
Transfers from non-operating properties	$	56,699	$	360	$	—	$	—	$	21,014	$	—	$	43,154	$	121,227	$	17,942	$	1,108	$	1,622		$	141,899
Segment assets at December 31, 2014	$	1,264,353	$	372,041	$	102,232	$	195,972	$	97,209	$	—	$	156,214	$	2,188,021	$	526,988	$	163,177	$	73,309		$	2,951,495
Year Ended December 31, 2013
Revenues from real estate operations	$	234,857	$	56,524	$	31,252	$	33,431	$	5,050	$	12,229	$	12,520	$	385,863	$	98,487	$	7,271	$	7,012		$	498,633
Property operating expenses	80,149		19,718		16,784		12,872		1,282		3,797		1,304		135,906		35,488		6,360		2,950			180,704
NOI from real estate operations	$	154,708	$	36,806	$	14,468	$	20,559	$	3,768	$	8,432	$	11,216	$	249,957	$	62,999	$	911	$	4,062		$	317,929
Additions to long-lived assets	$	28,009	$	5,522	$	5	$	4,945	$	3,563	$	200	$	—	$	42,244	$	13,244	$	598	$	791		$	56,877
Transfers from non-operating properties	$	50,067	$	37,234	$	—	$	14	$	48,799	$	987	$	24,200	$	161,301	$	32,692	$	70,106	$	191		$	264,290
Segment assets at December 31, 2013	$	1,229,192	$	385,061	$	103,650	$	195,105	$	77,773	$	—	$	117,012	$	2,107,793	$	556,718	$	166,790	$	74,329		$	2,905,630

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Notes to Consolidated Financial Statements (Continued)

The following table reconciles our segment revenues to total revenues as reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015			2014		2013
Segment revenues from real estate operations	$	519,068		$	479,711	$	498,633
Construction contract and other service revenues	106,402			106,748		62,363
Less: Revenues from discontinued operations (Note 18)	(4		)	14		(37,636		)
Total revenues	$	625,466		$	586,473	$	523,360

The following table reconciles our segment property operating expenses to property operating expenses as reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015		2014		2013
Segment property operating expenses	$	194,488	$	179,799	$	180,704
Less: Property operating expenses from discontinued operations (Note 18)	6		135		(13,505		)
Total property operating expenses	$	194,494	$	179,934	$	167,199

As previously discussed, we provide real estate services such as property management and construction and development services primarily for our properties but also for third parties.  The primary manner in which we evaluate the operating performance of our service activities is through a measure we define as net operating income from service operations (“NOI from service operations”), which is based on the net of revenues and expenses from these activities.  Construction contract and other service revenues and expenses consist primarily of subcontracted costs that are reimbursed to us by the customer along with a management fee. The operating margins from these activities are small relative to the revenue.  We believe NOI from service operations is a useful measure in assessing both our level of activity and our profitability in conducting such operations. The table below sets forth the computation of our NOI from service operations (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Construction contract and other service revenues	$	106,402		$	106,748		$	62,363
Construction contract and other service expenses	(102,696		)	(100,058		)	(58,875		)
NOI from service operations	$	3,706		$	6,690		$	3,488

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Notes to Consolidated Financial Statements (Continued)

The following table reconciles our NOI from real estate operations for reportable segments and NOI from service operations to income from continuing operations as reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
NOI from real estate operations	$	324,580		$	299,912		$	317,929
NOI from service operations	3,706			6,690			3,488
Interest and other income	4,517			4,923			3,834
Equity in income of unconsolidated entities	62			229			2,110
Income tax expense	(199		)	(310		)	(1,978		)
Other adjustments:	—
Depreciation and other amortization associated with real estate operations	(140,025		)	(136,086		)	(113,214		)
Impairment losses	(23,289		)	(1,416		)	(5,857		)
General, administrative and leasing expenses	(31,361		)	(31,794		)	(30,869		)
Business development expenses and land carry costs	(13,507		)	(5,573		)	(5,436		)
Interest expense on continuing operations	(89,074		)	(92,393		)	(82,010		)
NOI from discontinued operations	(10		)	(121		)	(24,131		)
Gain (loss) on early extinguishment of debt	85,275			(9,552		)	(27,030		)
COPT consolidated income from continuing operations	$	120,675		$	34,509		$	36,836

The following table reconciles our segment assets to the consolidated total assets of COPT and subsidiaries (in thousands):

	As of December 31,
	2015		2014
Segment assets	$	3,265,469	$	2,951,495
Non-operating property assets	450,679		567,586
Other assets	193,164		145,155
Total COPT consolidated assets	$	3,909,312	$	3,664,236

The accounting policies of the segments are the same as those used to prepare our consolidated financial statements, except that discontinued operations are not presented separately for segment purposes.  In the segment reporting presented above, we did not allocate interest expense, depreciation and amortization, impairment losses, loss on early extinguishment of debt and gain on sales of real estate to our real estate segments since they are not included in the measure of segment profit reviewed by management.  We also did not allocate general and administrative expenses, business development expenses and land carry costs, interest and other income, equity in income of unconsolidated entities, income taxes and noncontrolling interests because these items represent general corporate or non-operating property items not attributable to segments.

18.    Discontinued Operations

Income from discontinued operations primarily includes revenues and expenses associated with the following:

• 920 Elkridge Landing Road in the Baltimore/Washington Corridor that was sold on June 25, 2013;

• 4230 Forbes Boulevard in the Baltimore/Washington Corridor that was sold on December 11, 2013;

• 15 operating properties in Colorado Springs that were sold on December 12, 2013; and

• nine operating properties in the Baltimore/Washington Corridor and five operating properties in Colorado Springs for which the title to the properties was transferred to the mortgage lender on December 23, 2013.

F-50

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

The table below sets forth the components of discontinued operations reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Revenue from real estate operations	$	4		$	(14	)	$	37,636
Property operating expenses	6			135			(13,505		)
Depreciation and amortization	—			—			(4,505		)
Impairment losses	(234		)	(3		)	(26,190		)
General, administrative and leasing expenses	—			—			(4		)
Interest expense	—			—			(8,221		)
Gain on sales of real estate	—			24			2,671
Gain (loss) on early extinguishment of debt	380			(116		)	67,810
Discontinued operations	$	156		$	26		$	55,692

19.    Earnings Per Share (“EPS”) and Earnings Per Unit (“EPU”)

COPT and Subsidiaries EPS

We present both basic and diluted EPS.  We compute basic EPS by dividing net income available to common shareholders allocable to unrestricted common shares under the two-class method by the weighted average number of unrestricted common shares outstanding during the period.  Our computation of diluted EPS is similar except that:

• the denominator is increased to include: (1) the weighted average number of potential additional common shares that would have been outstanding if securities that are convertible into COPT common shares were converted; and (2) the effect of dilutive potential common shares outstanding during the period attributable to share-based compensation using the treasury stock or if-converted methods; and

• the numerator is adjusted to add back any changes in income or loss that would result from the assumed conversion into common shares that we added to the denominator.

F-51

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

Summaries of the numerator and denominator for purposes of basic and diluted EPS calculations are set forth below (in thousands, except per share data):

	For the Years Ended December 31,
	2015			2014			2013
Numerator:
Income from continuing operations	$	120,675		$	34,509		$	36,836
Gain on sales of real estate, net	68,047			10,671			9,016
Preferred share dividends	(14,210		)	(15,939		)	(19,971		)
Issuance costs associated with redeemed preferred shares	—			(1,769		)	(2,904		)
Income from continuing operations attributable to noncontrolling interests	(10,575		)	(4,955		)	(4,486		)
Income from continuing operations attributable to restricted shares	(706		)	(432		)	(414		)
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	$	163,231		$	22,085		$	18,077
Dilutive effect of common units in the Operating Partnership on diluted EPS from continuing operations	6,397			—			—
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders	$	169,628		$	22,085		$	18,077
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	$	163,231		$	22,085		$	18,077
Discontinued operations	156			26			55,692
Discontinued operations attributable to noncontrolling interests	(3		)	4			(3,351		)
Numerator for basic EPS on net income attributable to COPT common shareholders	$	163,384		$	22,115		$	70,418
Dilutive effect of common units in COPLP	6,403			—			—
Numerator for diluted EPS on net income attributable to COPT common shareholders	$	169,787		$	22,115		$	70,418
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	93,914			88,092			85,167
Dilutive effect of common units	3,692			—			—
Dilutive effect of share-based compensation awards	61			171			57
Denominator for diluted EPS (common shares)	97,667			88,263			85,224
Basic EPS:
Income from continuing operations attributable to COPT common shareholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPT common shareholders	—			—			0.62
Net income attributable to COPT common shareholders	$	1.74		$	0.25		$	0.83
Diluted EPS:
Income from continuing operations attributable to COPT common shareholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPT common shareholders	—			—			0.62
Net income attributable to COPT common shareholders	$	1.74		$	0.25		$	0.83

Our diluted EPS computations do not include the effects of the following securities since the conversions of such securities would increase diluted EPS for the respective periods (in thousands):

	Weighted Average Shares Excluded from Denominator for the Years Ended December 31,
	2015	2014	2013
Conversion of common units	—	3,897	3,869
Conversion of Series I preferred units	176	176	176
Conversion of Series K preferred shares	434	434	434

F-52

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

The following share-based compensation securities were excluded from the computation of diluted EPS because their effect was antidilutive:

• weighted average restricted shares and deferred share awards of 410,000 for 2015, 401,000 for 2014 and 385,000 for 2013; and

• weighted average options of 469,000 for 2015, 492,000 for 2014 and 636,000 for 2013, respectively.

As discussed in Note 10, we had outstanding senior notes with an exchange settlement feature, but such notes did not affect our diluted EPS reported above since the weighted average closing price of COPT’s common shares during each of the periods was less than the exchange prices per common share applicable for such periods.

COPLP and Subsidiaries EPU

We present both basic and diluted EPU.  We compute basic EPU by dividing net income available to common unitholders allocable to unrestricted common units under the two-class method by the weighted average number of unrestricted common units outstanding during the period.  Our computation of diluted EPU is similar except that:

• the denominator is increased to include: (1) the weighted average number of potential additional common units that would have been outstanding if securities that are convertible into our common units were converted; and (2) the effect of dilutive potential common units outstanding during the period attributable to share-based compensation using the treasury stock or if-converted methods; and

• the numerator is adjusted to add back any changes in income or loss that would result from the assumed conversion into common units that we added to the denominator.

F-53

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

Summaries of the numerator and denominator for purposes of basic and diluted EPU calculations are set forth below (in thousands, except per unit data):

	For the Years Ended December 31,
	2015			2014			2013
Numerator:
Income from continuing operations	$	120,675		$	34,509		$	36,836
Gain on sales of real estate, net	68,047			10,671			9,016
Preferred unit distributions	(14,870		)	(16,599		)	(20,631		)
Issuance costs associated with redeemed preferred units	—			(1,769		)	(2,904		)
Income from continuing operations attributable to noncontrolling interests	(3,523		)	(3,281		)	(2,977		)
Income from continuing operations attributable to restricted units	(706		)	(432		)	(414		)
Numerator for basic and diluted EPU from continuing operations attributable to COPLP common unitholders	$	169,623		$	23,099		$	18,926
Discontinued operations	156			26			55,692
Discontinued operations attributable to noncontrolling interests	3			5			(930		)
Numerator for basic and diluted EPU on net income attributable to COPLP common unitholders	$	169,782		$	23,130		$	73,688
Denominator (all weighted averages):
Denominator for basic EPU (common units)	97,606			91,989			89,036
Dilutive effect of share-based compensation awards	61			171			57
Denominator for diluted EPU (common units)	97,667			92,160			89,093
Basic EPU:
Income from continuing operations attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPLP common unitholders	—			—			0.62
Net income attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.83
Diluted EPU:
Income from continuing operations attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPLP common unitholders	—			—			0.62
Net income attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.83

Our diluted EPU computations do not include the effects of the following securities since the conversions of such securities would increase diluted EPU for the respective periods (in thousands):

	Weighted Average Units Excluded from Denominator for the Years Ended December 31,
	2015	2014	2013
Conversion of Series I preferred units	176	176	176
Conversion of Series K preferred units	434	434	434

The following share-based compensation securities were excluded from the computation of diluted EPU because their effect was antidilutive:

• weighted average restricted units and deferred share awards of 410,000 for 2015, 401,000 for 2014 and 385,000 for 2013; and

• weighted average options of 469,000 for 2015, 492,000 for 2014 and 636,000 for 2013.

As discussed in Note 10, we had outstanding senior notes with an exchange settlement feature, but such notes did not affect our diluted EPU reported above since the weighted average closing price of COPT’s common shares during each of the periods was less than the exchange prices per common share applicable for such periods.

F-54

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

20.    Commitments and Contingencies

Litigation

In the normal course of business, we are involved in legal actions arising from our ownership and administration of properties.  We establish reserves for specific legal proceedings when we determine that the likelihood of an unfavorable outcome is probable and the amount of loss can be reasonably estimated.  Management does not anticipate that any liabilities that may result from such proceedings will have a materially adverse effect on our financial position, operations or liquidity.  Our assessment of the potential outcomes of these matters involves significant judgment and is subject to change based on future developments.

Environmental

We are subject to various Federal, state and local environmental regulations related to our property ownership and operation.  We have performed environmental assessments of our properties, the results of which have not revealed any environmental liability that we believe would have a materially adverse effect on our financial position, operations or liquidity. 

Tax Incremental Financing Obligation

In August 2010, Anne Arundel County, Maryland issued $30 million in tax incremental financing bonds to third-party investors in order to finance public improvements needed in connection with our project known as National Business Park North.  The real estate taxes on increases in assessed value of a development district encompassing National Business Park North are to be transferred to a special fund pledged to the repayment of the bonds.  We recognized a $1.9 million liability through December 31, 2015 representing our estimated obligation to fund through a special tax any future shortfalls between debt service on the bonds and real estate taxes available to repay the bonds.

Operating Leases

We are obligated as lessee under operating leases (mostly ground leases) with various expiration dates extending to the year 2100. Future minimum rental payments due under the terms of these operating leases as of December 31, 2015 follow (in thousands):

Year Ending December 31,
2016	$	1,189
2017	1,117
2018	1,071
2019	1,049
2020	1,067
Thereafter	86,798
	$	92,291

Contractual Obligations

We had amounts remaining to be incurred under various contractual obligations as of December 31, 2015 that included the following:

• new development and redevelopment obligations of $87.8 million (including acquisitions of land);

• capital expenditures for operating properties of $47.9 million;

• third party construction and development of $10.7 million; and

• other purchase obligations of $3.6 million.

F-55

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

Environmental Indemnity Agreement

In connection with a lease and subsequent sale in 2008 and 2010 of three properties in Dayton, New Jersey, we agreed to provide certain environmental indemnifications. The prior owner of the properties, a Fortune 100 company that is responsible for groundwater contamination at such properties, previously agreed to indemnify us for (1) direct losses incurred in connection with the contamination and (2) its failure to perform remediation activities required by the State of New Jersey, up to the point that the state declares the remediation to be complete.  Under the environmental indemnification agreement, we agreed to the following:

• to indemnify the tenant against losses covered under the prior owner’s indemnity agreement if the prior owner fails to indemnify the tenant for such losses.  This indemnification is capped at $5.0 million in perpetuity after the State of New Jersey declares the remediation to be complete;

• to indemnify the tenant for consequential damages (e.g., business interruption) at one of the buildings in perpetuity and another of the buildings through 2025.  This indemnification is limited to $12.5 million; and

• to pay 50% of additional costs related to construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties.  This indemnification is limited to $300,000 annually and $1.5 million in the aggregate.

21.    Subsequent Event

On February 10, 2016, our Board of Trustees appointed Stephen E. Budorick, our Executive Vice President and Chief Operating Officer since September 2011, to become our President and Chief Executive Officer effective May 12, 2016, the date of the Company’s 2016 Annual Meeting of Shareholders. On that date, Roger A. Waesche, Jr., our current President and Chief Executive Officer, will leave the Company to pursue other interests and he will not be nominated for reelection as a Trustee. The Board expects to appoint Mr. Budorick to our Board of Trustees after the 2016 Annual Meeting of Shareholders. In connection with the departure of Mr. Waesche, we will recognize executive transition costs of approximately $2.9 million in 2016.

F-56

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Notes to Consolidated Financial Statements (Continued)

22.Quarterly Data (Unaudited)

The tables below set forth selected quarterly information for the years ended December 31, 2015 and 2014 (in thousands, except per share data). Certain of the amounts below have been reclassified to conform to the current period presentation of our consolidated financial statements.

	For the Year Ended December 31, 2015												For the Year Ended December 31, 2014
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter			First Quarter			Second Quarter			Third Quarter			Fourth Quarter
COPT and Subsidiaries
Revenues	$	161,034		$	170,363		$	150,744		$	143,325		$	146,667		$	139,820		$	153,015		$	146,971
Operating income	$	30,575		$	37,471		$	31,993		$	20,055		$	25,206		$	31,836		$	37,422		$	37,148
Income from continuing operations	$	10,987		$	16,839		$	94,279		$	(1,430	)	$	5,660		$	9,248		$	13,727		$	5,874
Discontinued operations	$	(238	)	$	394		$	—		$	—		$	11		$	(198	)	$	191		$	22
Net income	$	14,735		$	17,232		$	94,294		$	62,617		$	5,671		$	9,050		$	24,548		$	5,937
Net income attributable to noncontrolling interests	(1,380		)	(1,451		)	(4,494		)	(3,253		)	(930		)	(1,160		)	(1,828		)	(1,033		)
Net income attributable to COPT	13,355			15,781			89,800			59,364			4,741			7,890			22,720			4,904
Preferred share dividends	(3,552		)	(3,553		)	(3,552		)	(3,553		)	(4,490		)	(4,344		)	(3,553		)	(3,552		)
Issuance costs associated with redeemed preferred shares	—			—			—			—			—			(1,769		)	—			—
Net income attributable to COPT common shareholders	$	9,803		$	12,228		$	86,248		$	55,811		$	251		$	1,777		$	19,167		$	1,352
Basic earnings per common share	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01
Diluted earnings per common share	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01

COPLP and Subsidiaries
Revenues	$	161,034		$	170,363		$	150,744		$	143,325		$	146,667		$	139,820		$	153,015		$	146,971
Operating income	$	30,575		$	37,471		$	31,993		$	20,055		$	25,206		$	31,836		$	37,422		$	37,148
Income from continuing operations	$	10,987		$	16,839		$	94,279		$	(1,430	)	$	5,660		$	9,248		$	13,727		$	5,874
Discontinued operations	$	(238	)	$	394		$	—		$	—		$	11		$	(198	)	$	191		$	22
Net income	$	14,735		$	17,232		$	94,294		$	62,617		$	5,671		$	9,050		$	24,548		$	5,937
Net income attributable to noncontrolling interests	(818		)	(812		)	(972		)	(918		)	(737		)	(837		)	(897		)	(805		)
Net income attributable to COPLP	13,917			16,420			93,322			61,699			4,934			8,213			23,651			5,132
Preferred unit distributions	(3,717		)	(3,718		)	(3,717		)	(3,718		)	(4,655		)	(4,509		)	(3,718		)	(3,717		)
Issuance costs associated with redeemed preferred units	—			—			—			—			—			(1,769		)	—			—
Net income attributable to COPLP common unitholders	$	10,200		$	12,702		$	89,605		$	57,981		$	279		$	1,935		$	19,933		$	1,415
Basic earnings per common unit	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01
Diluted earnings per common unit	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01

F-57

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Schedule II—Valuation and Qualifying Accounts

Years Ended December 31, 2015, 2014 and 2013

(Dollars in thousands)

	Balance at Beginning of Year		Charged to Costs and Expenses (1)			Charged to Other Accounts (2)			Deductions (3)			Balance at End of Year
Accounts Receivables-Allowance for doubtful accounts
Year ended December 31, 2015	$	717	$	1,125		$	98		$	(415	)	$	1,525
Year ended December 31, 2014	$	2,976	$	278		$	—		$	(2,537	)	$	717
Year ended December 31, 2013	$	4,694	$	(65	)	$	—		$	(1,653	)	$	2,976
Allowance for Deferred Rent Receivable
Year ended December 31, 2015	$	1,418	$	—		$	544		$	—		$	1,962
Year ended December 31, 2014	$	2,126	$	—		$	(708	)	$	—		$	1,418
Year ended December 31, 2013	$	913	$	—		$	1,213		$	—		$	2,126
Allowance for Deferred Tax Asset
Year ended December 31, 2015	$	2,062	$	—		$	—		$	—		$	2,062
Year ended December 31, 2014	$	2,062	$	—		$	—		$	—		$	2,062
Year ended December 31, 2013	$	207	$	1,855		$	—		$	—		$	2,062

(1) Amounts charged to costs and expenses are net of recoveries.

(2) Allowances for certain accounts receivables were charged to service company revenue. Deferred rent receivable allowances were charged to rental revenue.

(3) Deductions reflect adjustments to reserves due to actual write-offs of accounts.

F-58

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Schedule III—Real Estate and Accumulated Depreciation

December 31, 2015

(Dollars in thousands)

				Initial Cost						Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)		Land		Building and Land Improvements		Costs Capitalized Subsequent to Acquisition		Land		Building and Land Improvements		Total (3)(4)		Accumulated Depreciation (5)			Year Built or Renovated	Date Acquired (6)
100 Light Street (O)	Baltimore, MD	$	50,732	$	26,715	$	58,343	$	55	$	26,715	$	58,398	$	85,113	$	(1,588	)	1973	8/7/2015
1000 Redstone Gateway (O)	Huntsville, AL	11,370		—		20,533		—		—		20,533		20,533		(1,438		)	2013	3/23/2010
1100 Redstone Gateway (O)	Huntsville, AL	11,791		—		19,593		—		—		19,593		19,593		(965		)	2014	3/23/2010
114 National Business Parkway (O)	Annapolis Junction, MD	—		364		3,109		60		364		3,169		3,533		(1,125		)	2002	6/30/2000
11751 Meadowville Lane (O)	Richmond, VA	—		1,305		52,098		112		1,305		52,210		53,515		(11,194		)	2007	9/15/2006
1200 Redstone Gateway (O)	Huntsville, AL	13,639		—		22,389		—		—		22,389		22,389		(1,145		)	2013	3/23/2010
1201 M Street (O)	Washington, DC	—		—		49,785		4,225		—		54,010		54,010		(8,947		)	2001	9/28/2010
1201 Winterson Road (O)	Linthicum, MD	—		1,288		12,175		460		1,288		12,635		13,923		(3,824		)	1985 (7)	4/30/1998
1220 12th Street, SE (O)	Washington, DC	—		—		42,464		2,431		—		44,895		44,895		(8,523		)	2003	9/28/2010
1243 Winterson Road (L)	Linthicum, MD	—		630		—		—		630		—		630		—			(8)	12/19/2001
1302 Concourse Drive (O)	Linthicum, MD	—		2,078		8,313		6,559		2,078		14,872		16,950		(6,188		)	1996	11/18/1999
1304 Concourse Drive (O)	Linthicum, MD	—		1,999		12,934		2,884		1,999		15,818		17,817		(6,360		)	2002	11/18/1999
1306 Concourse Drive (O)	Linthicum, MD	—		2,796		11,186		8,152		2,796		19,338		22,134		(6,922		)	1990	11/18/1999
131 National Business Parkway (O)	Annapolis Junction, MD	—		1,906		7,623		3,524		1,906		11,147		13,053		(5,596		)	1990	9/28/1998
132 National Business Parkway (O)	Annapolis Junction, MD	—		2,917		12,259		3,005		2,917		15,264		18,181		(7,700		)	2000	5/28/1999
133 National Business Parkway (O)	Annapolis Junction, MD	—		2,517		10,068		5,204		2,517		15,272		17,789		(8,230		)	1997	9/28/1998
1331 Ashton Road (O)	Hanover, MD	—		587		2,347		1,575		587		3,922		4,509		(1,337		)	1989	4/28/1999
1334 Ashton Road (O)	Hanover, MD	—		736		1,488		2,639		736		4,127		4,863		(2,467		)	1989	4/28/1999
134 National Business Parkway (O)	Annapolis Junction, MD	—		3,684		7,517		3,496		3,684		11,013		14,697		(4,062		)	1999	11/13/1998
1340 Ashton Road (O)	Hanover, MD	—		905		3,620		1,469		905		5,089		5,994		(2,621		)	1989	4/28/1999
1341 Ashton Road (O)	Hanover, MD	—		306		1,223		604		306		1,827		2,133		(932		)	1989	4/28/1999
1343 Ashton Road (O)	Hanover, MD	—		193		774		405		193		1,179		1,372		(640		)	1989	4/28/1999
13450 Sunrise Valley Road (O)	Herndon, VA	—		1,386		5,576		3,335		1,386		8,911		10,297		(3,902		)	1998	7/25/2003
13454 Sunrise Valley Road (O)	Herndon, VA	—		2,899		11,986		6,750		2,899		18,736		21,635		(7,177		)	1998	7/25/2003
135 National Business Parkway (O)	Annapolis Junction, MD	11,125		2,484		9,750		5,700		2,484		15,450		17,934		(6,467		)	1998	12/30/1998
1362 Mellon Road (O)	Hanover, MD	—		1,706		8,670		182		1,706		8,852		10,558		(1,517		)	2006	2/10/2006
13857 McLearen Road (O)	Herndon, VA	—		3,507		30,177		1,565		3,507		31,742		35,249		(6,961		)	2007	7/11/2012
140 National Business Parkway (O)	Annapolis Junction, MD	—		3,407		24,167		688		3,407		24,855		28,262		(7,647		)	2003	12/31/2003
141 National Business Parkway (O)	Annapolis Junction, MD	11,566		2,398		9,590		3,194		2,398		12,784		15,182		(5,963		)	1990	9/28/1998
14280 Park Meadow Drive (O)	Chantilly, VA	—		3,731		15,953		1,764		3,731		17,717		21,448		(6,185		)	1999	9/29/2004
1460 Dorsey Road (L)	Hanover, MD	—		1,800		—		—		1,800		—		1,800		—			(8)	2/28/2006
14840 Conference Center Drive (O)	Chantilly, VA	—		1,572		8,175		2,860		1,572		11,035		12,607		(4,320		)	2000	7/25/2003
14850 Conference Center Drive (O)	Chantilly, VA	—		1,615		8,358		2,947		1,615		11,305		12,920		(4,646		)	2000	7/25/2003
14900 Conference Center Drive (O)	Chantilly, VA	—		3,436		14,402		5,239		3,436		19,641		23,077		(8,221		)	1999	7/25/2003

F-59

			Initial Cost			Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)	Land	Building and Land Improvements	Costs Capitalized Subsequent to Acquisition	Land	Building and Land Improvements	Total (3)(4)	Accumulated Depreciation (5)		Year Built or Renovated	Date Acquired (6)
1501 South Clinton Street (O)	Baltimore, MD	—	27,964	52,146	8,165	27,964	60,311	88,275	(14,472	)	2006	10/27/2009
15049 Conference Center Drive (O)	Chantilly, VA	—	4,415	20,365	3,619	4,415	23,984	28,399	(9,236	)	1997	8/14/2002
15059 Conference Center Drive (O)	Chantilly, VA	—	5,753	13,615	2,065	5,753	15,680	21,433	(6,697	)	2000	8/14/2002
15395 John Marshall Highway (O)	Haymarket, VA	—	2,465	24,768	—	2,465	24,768	27,233	(1,195	)	2014	5/7/2013
1550 West Nursery Road (O)	Linthicum, MD	—	14,071	16,930	—	14,071	16,930	31,001	(3,626	)	2009	10/28/2009
1560 West Nursery Road (O)	Linthicum, MD	—	1,441	113	—	1,441	113	1,554	(5	)	2014	10/28/2009
1560A Cable Ranch Road (O) (10)	San Antonio, TX	—	1,097	3,770	394	1,097	4,164	5,261	(1,298	)	1985/2007	6/19/2008
1560B Cable Ranch Road (O) (10)	San Antonio, TX	—	2,299	6,545	159	2,299	6,704	9,003	(1,738	)	1985/2006	6/19/2008
16442 Commerce Drive (O)	Dahlgren, VA	—	613	2,582	883	613	3,465	4,078	(1,332	)	2002	12/21/2004
16480 Commerce Drive (O)	Dahlgren, VA	—	1,856	7,425	1,283	1,856	8,708	10,564	(2,316	)	2000	12/28/2004
16501 Commerce Drive (O)	Dahlgren, VA	—	522	2,090	482	522	2,572	3,094	(797	)	2002	12/21/2004
16539 Commerce Drive (O)	Dahlgren, VA	—	688	2,860	1,524	688	4,384	5,072	(1,934	)	1990	12/21/2004
16541 Commerce Drive (O)	Dahlgren, VA	—	773	3,094	1,368	773	4,462	5,235	(1,727	)	1996	12/21/2004
16543 Commerce Drive (O)	Dahlgren, VA	—	436	1,742	502	436	2,244	2,680	(573	)	2002	12/21/2004
1751 Pinnacle Drive (O)	McLean, VA	—	10,486	42,339	24,059	10,486	66,398	76,884	(23,750	)	1989/1995	9/23/2004
1753 Pinnacle Drive (O)	McLean, VA	—	8,275	34,353	10,894	8,275	45,247	53,522	(15,849	)	1976/2004	9/23/2004
201 Technology Drive (O)	Lebanon, VA	—	726	31,091	59	726	31,150	31,876	(6,358	)	2007	10/5/2007
206 Research Boulevard (O)	Aberdeen, MD	—	1,813	17,485	—	1,813	17,485	19,298	(1,416	)	2012	9/14/2007
209 Research Boulevard (O)	Aberdeen, MD	—	1,045	16,087	79	1,045	16,166	17,211	(2,069	)	2010	9/14/2007
210 Research Boulevard (O)	Aberdeen, MD	—	1,065	15,102	75	1,065	15,177	16,242	(1,569	)	2010	9/14/2007
2100 L Street (L)	Washington, DC	—	1,273	1,685	—	1,273	1,685	2,958	—		(8)	8/11/2015
2100 Rideout Road (O)	Huntsville, AL	—	—	2,586	—	—	2,586	2,586	—		(7)	3/23/2010
21267 Smith Switch Road (O)	Ashburn, VA	—	4,040	10,135	—	4,040	10,135	14,175	(365	)	2014	12/27/2012
21271 Smith Switch Road (O)	Ashburn, VA	—	7,346	18,267	—	7,346	18,267	25,613	(881	)	2013	12/27/2012
22289 Exploration Drive (O)	Lexington Park, MD	—	1,422	5,719	1,660	1,422	7,379	8,801	(2,826	)	2000	3/24/2004
22299 Exploration Drive (O)	Lexington Park, MD	—	1,362	5,791	1,218	1,362	7,009	8,371	(2,641	)	1998	3/24/2004
22300 Exploration Drive (O)	Lexington Park, MD	—	1,094	5,038	1,315	1,094	6,353	7,447	(2,024	)	1997	11/9/2004
22309 Exploration Drive (O)	Lexington Park, MD	—	2,243	10,419	7,787	2,243	18,206	20,449	(4,683	)	1984/1997	3/24/2004
23535 Cottonwood Parkway (O)	California, MD	—	692	3,051	248	692	3,299	3,991	(1,206	)	1984	3/24/2004
250 W Pratt St (O)	Baltimore, MD	—	8,057	34,654	4,765	8,057	39,419	47,476	(1,652	)	1985	3/19/2015
2500 Riva Road (O)	Annapolis, MD	—	2,791	12,145	1	2,791	12,146	14,937	(4,417	)	2000	3/4/2003
2600 Park Tower Drive (O)	Vienna, VA	—	20,304	34,443	346	20,304	34,789	55,093	(1,051	)	1999	4/15/2015
2691 Technology Drive (O)	Annapolis Junction, MD	—	2,098	17,334	5,305	2,098	22,639	24,737	(7,827	)	2005	5/26/2000
2701 Technology Drive (O)	Annapolis Junction, MD	22,053	1,737	15,266	2,821	1,737	18,087	19,824	(7,567	)	2001	5/26/2000
2711 Technology Drive (O)	Annapolis Junction, MD	17,153	2,251	21,611	1,468	2,251	23,079	25,330	(10,158	)	2002	11/13/2000
2720 Technology Drive (O)	Annapolis Junction, MD	—	3,863	29,272	146	3,863	29,418	33,281	(8,316	)	2004	1/31/2002
2721 Technology Drive (O)	Annapolis Junction, MD	—	4,611	14,597	1,263	4,611	15,860	20,471	(6,400	)	2000	10/21/1999
2730 Hercules Road (O)	Annapolis Junction, MD	34,256	8,737	31,612	7,213	8,737	38,825	47,562	(15,674	)	1990	9/28/1998
2900 Towerview Road (O)	Herndon, VA	—	3,207	16,379	6,509	3,207	22,888	26,095	(7,181	)	1982/2008	12/20/2005

F-60

			Initial Cost			Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)	Land	Building and Land Improvements	Costs Capitalized Subsequent to Acquisition	Land	Building and Land Improvements	Total (3)(4)	Accumulated Depreciation (5)		Year Built or Renovated	Date Acquired (6)
30 Light Street (O)	Baltimore, MD	4,268	—	12,101	37	—	12,138	12,138	(128	)	2009	8/7/2015
300 Sentinel Drive (O)	Annapolis Junction, MD	—	1,517	59,016	219	1,517	59,235	60,752	(8,458	)	2009	11/14/2003
302 Sentinel Drive (O)	Annapolis Junction, MD	—	2,648	29,687	445	2,648	30,132	32,780	(6,000	)	2007	11/14/2003
304 Sentinel Drive (O)	Annapolis Junction, MD	—	3,411	24,917	193	3,411	25,110	28,521	(6,304	)	2005	11/14/2003
306 Sentinel Drive (O)	Annapolis Junction, MD	15,878	3,260	22,592	611	3,260	23,203	26,463	(5,269	)	2006	11/14/2003
308 Sentinel Drive (O)	Annapolis Junction, MD	—	1,422	26,208	37	1,422	26,245	27,667	(3,050	)	2010	11/14/2003
310 Sentinel Way (O)	Annapolis Junction, MD	—	2,372	36,468	—	2,372	36,468	38,840	(191	)	(7)	11/14/2003
310 The Bridge Street (O)	Huntsville, AL	—	261	26,531	1,695	261	28,226	28,487	(5,136	)	2009	8/9/2011
312 Sentinel Way (O)	Annapolis Junction, MD	—	3,138	27,789	—	3,138	27,789	30,927	(913	)	2014	11/14/2003
3120 Fairview Park Drive (O)	Falls Church, VA	—	6,863	35,606	8,773	6,863	44,379	51,242	(7,229	)	2008	11/23/2010
314 Sentinel Way (O)	Annapolis Junction, MD	—	1,254	1,439	—	1,254	1,439	2,693	(249	)	2008	11/14/2003
316 Sentinel Way (O)	Annapolis Junction, MD	—	2,748	38,156	138	2,748	38,294	41,042	(3,570	)	2011	11/14/2003
318 Sentinel Way (O)	Annapolis Junction, MD	—	2,185	28,426	—	2,185	28,426	30,611	(6,981	)	2005	11/14/2003
320 Sentinel Way (O)	Annapolis Junction, MD	—	2,067	21,623	—	2,067	21,623	23,690	(4,310	)	2007	11/14/2003
322 Sentinel Way (O)	Annapolis Junction, MD	21,122	2,605	22,827	—	2,605	22,827	25,432	(5,143	)	2006	11/14/2003
324 Sentinel Way (O)	Annapolis Junction, MD	—	1,656	23,018	—	1,656	23,018	24,674	(3,078	)	2010	6/29/2006
410 National Business Parkway (O)	Annapolis Junction, MD	—	1,831	23,257	112	1,831	23,369	25,200	(1,719	)	2012	6/29/2006
420 National Business Parkway (O)	Annapolis Junction, MD	—	2,370	27,490	106	2,370	27,596	29,966	(1,230	)	2013	6/29/2006
430 National Business Parkway (O)	Annapolis Junction, MD	—	1,852	21,153	119	1,852	21,272	23,124	(2,034	)	2011	6/29/2006
44408 Pecan Court (O)	California, MD	—	817	1,583	581	817	2,164	2,981	(560	)	1986	3/24/2004
44414 Pecan Court (O)	California, MD	—	405	1,619	337	405	1,956	2,361	(725	)	1986	3/24/2004
44417 Pecan Court (O)	California, MD	—	434	3,348	88	434	3,436	3,870	(1,127	)	1989/2015	3/24/2004
44420 Pecan Court (O)	California, MD	—	344	890	148	344	1,038	1,382	(255	)	1989	11/9/2004
44425 Pecan Court (O)	California, MD	—	1,309	3,506	1,590	1,309	5,096	6,405	(1,784	)	1997	5/5/2004
45310 Abell House Lane (O)	California, MD	—	2,272	13,808	—	2,272	13,808	16,080	(1,403	)	2011	8/30/2010
46579 Expedition Drive (O)	Lexington Park, MD	—	1,406	5,796	1,335	1,406	7,131	8,537	(3,060	)	2002	3/24/2004
46591 Expedition Drive (O)	Lexington Park, MD	—	1,200	7,199	1,134	1,200	8,333	9,533	(1,933	)	2005	3/24/2004
4851 Stonecroft Boulevard (O)	Chantilly, VA	—	1,878	11,558	21	1,878	11,579	13,457	(3,248	)	2004	8/14/2002
4940 Campbell Drive (O) (10)	White Marsh, MD	—	1,379	2,728	1,464	1,379	4,192	5,571	(445	)	1990	1/9/2007
525 Babcock Road (O)	Colorado Springs, CO	—	355	397	79	355	476	831	(173	)	1967	7/12/2007
5325 Nottingham Drive (O)	White Marsh, MD	—	816	3,976	485	816	4,461	5,277	(1,233	)	2002	1/9/2007
5355 Nottingham Drive (O)	White Marsh, MD	—	761	3,562	1,758	761	5,320	6,081	(2,132	)	2005	1/9/2007
540 National Business Parkway (O)	Annapolis Junction, MD	—	2,035	9,496	—	2,035	9,496	11,531	—		(7)	6/29/2006
5520 Research Park Drive (O)	Catonsville, MD	—	—	20,072	201	—	20,273	20,273	(3,195	)	2009	4/4/2006
5522 Research Park Drive (O)	Catonsville, MD	—	—	4,550	—	—	4,550	4,550	(955	)	2007	3/8/2006
5825 University Research Court (O)	College Park, MD	15,255	—	22,740	87	—	22,827	22,827	(3,817	)	2008	1/29/2008
5850 University Research Court (O)	College Park, MD	20,771	—	31,906	406	—	32,312	32,312	(4,580	)	2008	1/29/2008
6700 Alexander Bell Drive (O)	Columbia, MD	—	1,755	7,019	6,226	1,755	13,245	15,000	(5,913	)	1988	5/14/2001
6708 Alexander Bell Drive (O)	Columbia, MD	—	897	8,844	1,591	897	10,435	11,332	(3,414	)	1988 (7)	5/14/2001

F-61

			Initial Cost			Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)	Land	Building and Land Improvements	Costs Capitalized Subsequent to Acquisition	Land	Building and Land Improvements	Total (3)(4)	Accumulated Depreciation (5)		Year Built or Renovated	Date Acquired (6)
6711 Columbia Gateway Drive (O)	Columbia, MD	—	2,683	23,239	619	2,683	23,858	26,541	(5,407	)	2006-2007	9/28/2000
6716 Alexander Bell Drive (O)	Columbia, MD	—	1,242	4,969	3,352	1,242	8,321	9,563	(4,359	)	1990	12/31/1998
6721 Columbia Gateway Drive (O)	Columbia, MD	16,663	1,753	34,090	76	1,753	34,166	35,919	(5,798	)	2009	9/28/2000
6724 Alexander Bell Drive (O)	Columbia, MD	—	449	5,039	708	449	5,747	6,196	(2,266	)	2001	5/14/2001
6731 Columbia Gateway Drive (O)	Columbia, MD	—	2,807	19,098	2,916	2,807	22,014	24,821	(8,494	)	2002	3/29/2000
6740 Alexander Bell Drive (O)	Columbia, MD	—	1,424	5,696	3,340	1,424	9,036	10,460	(5,058	)	1992	12/31/1998
6741 Columbia Gateway Drive (O)	Columbia, MD	—	675	1,711	124	675	1,835	2,510	(357	)	2008	9/28/2000
6750 Alexander Bell Drive (O)	Columbia, MD	—	1,263	12,461	3,457	1,263	15,918	17,181	(7,576	)	2001	12/31/1998
6760 Alexander Bell Drive (O)	Columbia, MD	—	890	3,561	2,974	890	6,535	7,425	(3,248	)	1991	12/31/1998
6940 Columbia Gateway Drive (O)	Columbia, MD	—	3,545	9,916	5,537	3,545	15,453	18,998	(7,000	)	1999	11/13/1998
6950 Columbia Gateway Drive (O)	Columbia, MD	—	3,596	14,269	3,087	3,596	17,356	20,952	(7,506	)	1998	10/22/1998
7000 Columbia Gateway Drive (O)	Columbia, MD	—	3,131	12,103	2,138	3,131	14,241	17,372	(4,482	)	1999	5/31/2002
7005 Columbia Gateway Drive (O)	Columbia, MD	—	3,036	189	—	3,036	189	3,225	—		(8)	6/26/2014
7015 Albert Einstein Drive (O)	Columbia, MD	1,570	2,058	6,093	1,527	2,058	7,620	9,678	(2,915	)	1999	12/1/2005
7061 Columbia Gateway Drive (O)	Columbia, MD	—	729	3,094	1,407	729	4,501	5,230	(1,802	)	2000	8/30/2001
7063 Columbia Gateway Drive (O)	Columbia, MD	—	902	3,684	2,512	902	6,196	7,098	(2,452	)	2000	8/30/2001
7065 Columbia Gateway Drive (O)	Columbia, MD	—	919	3,763	3,095	919	6,858	7,777	(2,773	)	2000	8/30/2001
7067 Columbia Gateway Drive (O)	Columbia, MD	—	1,829	11,823	2,838	1,829	14,661	16,490	(6,154	)	2001	8/30/2001
7125 Columbia Gateway Drive (L)	Columbia, MD	—	3,361	1,677	279	3,361	1,956	5,317	—		1973/1999 (8)	6/29/2006
7125 Columbia Gateway Drive (O)	Columbia, MD	—	17,126	46,994	9,813	17,126	56,807	73,933	(16,632	)	1973/1999	6/29/2006
7130 Columbia Gateway Drive (O)	Columbia, MD	—	1,350	4,359	1,906	1,350	6,265	7,615	(2,692	)	1989	9/19/2005
7134 Columbia Gateway Drive (O)	Columbia, MD	—	704	2,139	314	704	2,453	3,157	(1,234	)	1990 (7)	9/19/2005
7138 Columbia Gateway Drive (O)	Columbia, MD	—	1,104	3,518	2,118	1,104	5,636	6,740	(3,139	)	1990	9/19/2005
7142 Columbia Gateway Drive (O)	Columbia, MD	—	1,342	3,978	2,502	1,342	6,480	7,822	(2,322	)	1994	9/19/2005
7150 Columbia Gateway Drive (O)	Columbia, MD	—	1,032	3,429	665	1,032	4,094	5,126	(1,170	)	1991	9/19/2005
7150 Riverwood Drive (O)	Columbia, MD	—	1,821	4,388	1,713	1,821	6,101	7,922	(1,933	)	2000	1/10/2007
7160 Riverwood Drive (O)	Columbia, MD	—	2,732	7,006	2,275	2,732	9,281	12,013	(3,265	)	2000	1/10/2007
7170 Riverwood Drive (O)	Columbia, MD	—	1,283	3,096	692	1,283	3,788	5,071	(1,386	)	2000	1/10/2007
7175 Riverwood Drive (O)	Columbia, MD	—	1,788	7,269	—	1,788	7,269	9,057	(389	)	1996/2013	7/27/2005
7200 Redstone Gateway (O)	Huntsville, AL	6,649	—	8,347	—	—	8,347	8,347	(328	)	2013	3/23/2010
7200 Riverwood Road (O)	Columbia, MD	—	4,089	22,544	3,994	4,089	26,538	30,627	(8,761	)	1986	10/13/1998
7205 Riverwood Drive (O)	Columbia, MD	—	1,367	21,484	—	1,367	21,484	22,851	(1,310	)	2013	7/27/2005
7272 Park Circle Drive (O)	Hanover, MD	4,747	1,479	6,300	3,883	1,479	10,183	11,662	(2,956	)	1991/1996	1/10/2007
7318 Parkway Drive (O)	Hanover, MD	—	972	3,888	1,002	972	4,890	5,862	(2,084	)	1984	4/16/1999
7320 Parkway Drive (O)	Hanover, MD	—	905	3,570	5,048	905	8,618	9,523	(2,883	)	1983	4/4/2002
7400 Redstone Gateway (O)	Huntsville, AL	7,292	—	9,012	—	—	9,012	9,012	(121	)	2015	3/23/2010
7467 Ridge Road (O)	Hanover, MD	—	1,629	6,517	3,645	1,629	10,162	11,791	(4,439	)	1990	4/28/1999
7740 Milestone Parkway (O)	Hanover, MD	18,987	3,825	34,176	404	3,825	34,580	38,405	(4,692	)	2009	7/2/2007
7770 Backlick Road (O)	Springfield, VA	—	6,387	74,325	141	6,387	74,466	80,853	(5,292	)	2012	3/10/2010

F-62

			Initial Cost			Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)	Land	Building and Land Improvements	Costs Capitalized Subsequent to Acquisition	Land	Building and Land Improvements	Total (3)(4)	Accumulated Depreciation (5)		Year Built or Renovated	Date Acquired (6)
7880 Milestone Parkway (O)	Hanover, MD	—	4,857	23,647	—	4,857	23,647	28,504	(215	)	2015 (7)	9/17/2013
8003 Corporate Drive (O) (10)	White Marsh, MD	—	611	1,126	685	611	1,811	2,422	(99	)	1999	1/9/2007
8007 Corporate Drive (O) (10)	White Marsh, MD	—	1,434	350	1,218	1,434	1,568	3,002	(278	)	1995	1/9/2007
8010 Corporate Drive (O) (10)	White Marsh, MD	—	1,349	3,262	1,744	1,349	5,006	6,355	(1,448	)	1998	1/9/2007
8013 Corporate Drive (O) (10)	White Marsh, MD	—	642	1,072	1,808	642	2,880	3,522	(519	)	1990	1/9/2007
8015 Corporate Drive (O) (10)	White Marsh, MD	—	446	1,116	466	446	1,582	2,028	(468	)	1990	1/9/2007
8019 Corporate Drive (O) (10)	White Marsh, MD	—	680	1,898	825	680	2,723	3,403	(827	)	1990	1/9/2007
8020 Corporate Drive (O) (10)	White Marsh, MD	—	2,184	3,767	2,205	2,184	5,972	8,156	(1,703	)	1997	1/9/2007
8023 Corporate Drive (O) (10)	White Marsh, MD	—	651	1,164	5	651	1,169	1,820	(47	)	1990	1/9/2007
8094 Sandpiper Circle (O) (10)	White Marsh, MD	—	1,960	3,716	1,129	1,960	4,845	6,805	(1,267	)	1998	1/9/2007
8098 Sandpiper Circle (O) (10)	White Marsh, MD	—	1,797	3,651	639	1,797	4,290	6,087	(929	)	1998	1/9/2007
8110 Corporate Drive (O) (10)	White Marsh, MD	—	2,285	10,117	989	2,285	11,106	13,391	(3,133	)	2001	1/9/2007
8140 Corporate Drive (O) (10)	White Marsh, MD	—	2,158	8,457	3,163	2,158	11,620	13,778	(4,117	)	2003	1/9/2007
8621 Robert Fulton Drive (O)	Columbia, MD	—	2,317	12,642	344	2,317	12,986	15,303	(3,378	)	2005-2006	6/10/2005
8661 Robert Fulton Drive (O)	Columbia, MD	—	1,510	3,764	2,420	1,510	6,184	7,694	(2,117	)	2002	12/30/2003
8671 Robert Fulton Drive (O)	Columbia, MD	—	1,718	4,280	3,931	1,718	8,211	9,929	(3,060	)	2002	12/30/2003
870 Elkridge Landing Road (O)	Linthicum, MD	—	2,003	9,442	7,616	2,003	17,058	19,061	(8,411	)	1981	8/3/2001
891 Elkridge Landing Road (O)	Linthicum, MD	—	1,165	4,772	2,928	1,165	7,700	8,865	(3,488	)	1984	7/2/2001
900 Elkridge Landing Road (O)	Linthicum, MD	—	1,993	7,972	3,603	1,993	11,575	13,568	(6,009	)	1982	4/30/1998
901 Elkridge Landing Road (O)	Linthicum, MD	—	1,156	4,437	2,390	1,156	6,827	7,983	(3,015	)	1984	7/2/2001
911 Elkridge Landing Road (O)	Linthicum, MD	—	1,215	4,861	2,024	1,215	6,885	8,100	(3,462	)	1985	4/30/1998
921 Elkridge Landing Road (O)	Linthicum, MD	—	1,044	4,727	748	1,044	5,475	6,519	(4,924	)	1983 (7)	4/30/1998
938 Elkridge Landing Road (O)	Linthicum, MD	—	922	4,748	1,263	922	6,011	6,933	(2,116	)	1984	7/2/2001
939 Elkridge Landing Road (O)	Linthicum, MD	—	939	3,756	4,245	939	8,001	8,940	(3,337	)	1983	4/30/1998
940 Elkridge Landing Road (L)	Linthicum, MD	—	842	4	—	842	4	846	—		(8)	7/2/2001
9651 Hornbaker Road (D)	Manassas, VA	—	6,050	249,706	985	6,050	250,691	256,741	(18,119	)	2010	9/14/2010
Aerotech Commerce (L)	Colorado Springs, CO	—	900	—	—	900	—	900	—		(8)	5/19/2006
Arborcrest (O)	Blue Bell, PA	—	21,968	122,759	1,301	21,968	124,060	146,028	(25,901	)	1991-96/2015	10/14/1997
Arundel Preserve (L)	Hanover, MD	—	13,401	9,331	—	13,401	9,331	22,732	—		(8)	7/2/2007
Ashburn Crossing - DC10 (O)	Ashburn, VA	—	4,408	10,689	—	4,408	10,689	15,097	(225	)	2015	12/27/2012
Canton Crossing Land (L)	Baltimore, MD	—	16,085	2,134	—	16,085	2,134	18,219	—		(8)	10/27/2009
Canton Crossing Util Distr Ctr (O)	Baltimore, MD	—	7,300	15,556	942	7,300	16,498	23,798	(3,326	)	2006	10/27/2009
Columbia Gateway - Southridge (L)	Columbia, MD	—	6,387	3,539	—	6,387	3,539	9,926	—		(8)	9/20/2004
Dahlgren Technology Center (L)	Dahlgren, VA	—	978	178	—	978	178	1,156	—		(8)	3/16/2005
Expedition VII (L)	Lexington Park, MD	—	705	728	—	705	728	1,433	—		(8)	3/24/2004
InterQuest (L) (10)	Colorado Springs, CO	—	8,201	—	—	8,201	—	8,201	—		(8)	9/28/2005
M Square Research Park (L)	College Park, MD	—	—	2,986	—	—	2,986	2,986	—		(8)	1/29/2008
National Business Park North (L)	Annapolis Junction, MD	—	28,066	41,936	—	28,066	41,936	70,002	—		(8)	6/29/2006
North Gate Business Park (L)	Aberdeen, MD	—	6,309	4,540	—	6,309	4,540	10,849	—		(8)	9/14/2007

F-63

				Initial Cost						Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)		Land		Building and Land Improvements		Costs Capitalized Subsequent to Acquisition		Land		Building and Land Improvements		Total (3)(4)		Accumulated Depreciation (5)			Year Built or Renovated	Date Acquired (6)
Northwest Crossroads (L)	San Antonio, TX	—		7,430		847		—		7,430		847		8,277		—			(8)	1/20/2006
NOVA Office A (O) (9)	Chantilly, VA	—		2,096		47,364		—		2,096		47,364		49,460		(1,046		)	2015	7/31/2002
NOVA Office B (O) (9)	Chantilly, VA	—		739		26,277		—		739		26,277		27,016		—			(7)	7/31/2002
NOVA Office D (O)	Chantilly, VA	—		6,587		103		—		6,587		103		6,690		—			(7)	7/31/2002
Old Annapolis Road (O)	Columbia, MD	—		1,637		5,500		3,457		1,637		8,957		10,594		(2,983		)	1974/1985	12/14/2000
Patriot Park (L)	Colorado Springs, CO	—		2,328		1		—		2,328		1		2,329		—			(8)	7/8/2005
Patriot Point - DC15 (O)	Ashburn, VA	—		12,156		7,112		—		12,156		7,112		19,268		—			(7)	10/15/2015
Patriot Point - DC16 (O)	Ashburn, VA	—		12,156		4,110		—		12,156		4,110		16,266		—			(7)	10/15/2015
Patriot Point - DC17 (O)	Ashburn, VA	—		6,078		472		—		6,078		472		6,550		—			(7)	10/15/2015
Patriot Ridge (L)	Springfield, VA	—		18,517		14,423		—		18,517		14,423		32,940		—			(8)	3/10/2010
Redstone Gateway (L)	Huntsville, AL	—		—		14,250		—		—		14,250		14,250		—			(8)	3/23/2010
Route 15/Biggs Ford Road (L)	Frederick, MD	—		8,703		596		—		8,703		596		9,299		—			(8)	8/28/2008
Sentry Gateway (L)	San Antonio, TX	—		8,275		3,645		—		8,275		3,645		11,920		—			(8)	3/30/2005
Sentry Gateway - T (O)	San Antonio, TX	—		14,020		38,804		13		14,020		38,817		52,837		(8,618		)	1982/1985	3/30/2005
Sentry Gateway - V (O)	San Antonio, TX	—		—		1,066		—		—		1,066		1,066		(188		)	2007	3/30/2005
Sentry Gateway - W (O)	San Antonio, TX	—		—		1,884		—		—		1,884		1,884		(296		)	2009	3/30/2005
Sentry Gateway - X (O)	San Antonio, TX	—		1,964		21,178		—		1,964		21,178		23,142		(2,728		)	2010	1/20/2006
Sentry Gateway - Y (O)	San Antonio, TX	—		1,964		21,298		—		1,964		21,298		23,262		(2,745		)	2010	1/20/2006
Sentry Gateway - Z (O)	San Antonio, TX	—		1,964		30,335		—		1,964		30,335		32,299		(616		)	2015	6/14/2005
Southpoint Manassas - DC12 (O)	Manassas, VA	—		4,518		12,701		—		4,518		12,701		17,219		(127		)	2015	2/6/2015
Southpoint Manassas - DC14 (O)	Manassas, VA	—		4,518		13,009		—		4,518		13,009		17,527		(101		)	2015	2/6/2015
Westfields - Park Center (L)	Chantilly, VA	—		16,418		7,488		—		16,418		7,488		23,906		—			(8)	7/18/2002
Westfields Corporate Center (L)	Chantilly, VA	—		7,141		1,423		—		7,141		1,423		8,564		—			(8)	7/31/2002
White Marsh (L)	White Marsh, MD	—		7,852		2,570		—		7,852		2,570		10,422		—			(8)	1/9/2007
Woodland Park (L) (10)	Herndon, VA	—		9,614		85		—		9,614		85		9,699		—			(8)	4/29/2004
Other Developments, including intercompany eliminations (V)	Various	—		94		34		431		94		465		559		(39		)	Various	Various
		$	316,887	$	709,953	$	3,106,271	$	342,392	$	709,953	$	3,448,663	$	4,158,616	$	(718,680	)

(1) A legend for the Property Type follows: (O) = Office Property; (L) = Land held or pre-construction; (D) = Data Center; and (V) = Various.

(2) Excludes our Revolving Credit Facility of $43.5 million, term loan facilities of $515.9 million, unsecured senior notes of $1.2 billion, unsecured notes payable of $1.5 million, a letter of credit on a mortgage loan of $14.8 million, and deferred financing costs, net of premiums, on the remaining loans of $668,000.

(3) The aggregate cost of these assets for Federal income tax purposes was approximately $3.5 billion at December 31, 2015.

(4) As discussed in Note 3 to our Consolidated Financial Statements, we recognized impairment losses of $23.5 millionprimarily in connection with certain of our land and operating properties, including $22.0 million related to land and operating properties still owned as of December 31, 2015.

(5) The estimated lives over which depreciation is recognized follow: Building and land improvements: 10-40 years; and tenant improvements: related lease terms.

(6) The acquisition date of multi-parcel properties reflects the date of the earliest parcel acquisition.

(7) Under construction or redevelopment at December 31, 2015.

(8) Held or under pre-construction at December 31, 2015.

(9) The carrying amounts of these properties under construction exclude allocated costs of the garage being constructed to support the properties.

(10) Classified as held for sale as of December 31, 2015.

F-64

The following table summarizes our changes in cost of properties for the years ended December 31, 2015, 2014 and 2013 (in thousands):
		2015			2014			2013
	Beginning balance	$	4,014,336		$	3,811,950		$	3,859,960
	Acquisitions of operating properties	194,616			—			—
	Improvements and other additions	273,761			254,868			249,639
	Sales	(172,628		)	(48,466		)	(141,045		)
	Impairments	(29,548		)	(3,042		)	(45,931		)
	Other dispositions	(121,921		)	(974		)	(110,673		)
	Ending balance	$	4,158,616		$	4,014,336		$	3,811,950
The following table summarizes our changes in accumulated depreciation for the same time periods (in thousands):
		2015			2014			2013
	Beginning balance	$	703,083		$	597,649		$	568,176
	Depreciation expense	112,695			111,326			92,677
	Sales	(49,614		)	(3,129		)	(9,542		)
	Impairments	(6,092		)	(1,671		)	(14,863		)
	Other dispositions	(41,392		)	(1,092		)	(38,799		)
	Ending balance	$	718,680		$	703,083		$	597,649

F-65

EX-10.21

Exhibit 10.21

TERM LOAN AGREEMENT

Dated as of December 17, 2015,

by and among

CORPORATE OFFICE PROPERTIES, L.P.,

as Borrower,

CORPORATE OFFICE PROPERTIES TRUST,

as Parent,

THE FINANCIAL INSTITUTIONS INITIALLY SIGNATORY HERETO

AND THEIR ASSIGNEES PURSUANT TO SECTION 12.5.,

as Lenders,

and

CAPITAL ONE, NATIONAL ASSOCIATION,

as Administrative Agent

CAPITAL ONE, NATIONAL ASSOCIATION,

PNC CAPITAL MARKETS LLC

and

REGIONS CAPITAL MARKETS, A DIVISION OF REGIONS BANK,

as Joint Lead Arrangers and
Joint Bookrunners,

PNC BANK, NATIONAL ASSOCIATION,

and

REGIONS BANK,

as Syndication Agents

TABLE OF CONTENTS
Article I. Definitions		1
	Section 1.1. Definitions	1
	Section 1.2. General; References to Times	24
	Section 1.3. Financial Attributes of Non-Wholly Owned Subsidiaries	25
Article II. Credit Facility		25
	Section 2.1. Loans	25
	Section 2.2. Rates and Payment of Interest on Loans	26
	Section 2.3. Number of Interest Periods	27
	Section 2.4. Repayment of Loans	27
	Section 2.5. Prepayments	27
	Section 2.6. Continuation	27
	Section 2.7. Conversion	28
	Section 2.8. Notes	28
	Section 2.9. Additional Term Loans	29
Article III. Payments, Fees and Other General Provisions		30
	Section 3.1. Payments	30
	Section 3.2. Pro Rata Treatment	30
	Section 3.3. Sharing of Payments, Etc.	30
	Section 3.4. Several Obligations	31
	Section 3.5. Minimum Amounts	31
	Section 3.6. Fees	31
	Section 3.7. Computations	31
	Section 3.8. Usury	32
	Section 3.9. Agreement Regarding Interest and Charges	32
	Section 3.10. Statements of Account	32
	Section 3.11. Defaulting Lenders	32
	Section 3.12. Taxes	34
Article IV. Yield Protection, Etc.		37
	Section 4.1. Additional Costs; Capital Adequacy	37
	Section 4.2. Suspension of LIBOR Loans	39
	Section 4.3. Illegality	39
	Section 4.4. Compensation	39
	Section 4.5. Treatment of Affected Loans	40
	Section 4.6. Affected Lenders	40
	Section 4.7. Change of Lending Office	41
	Section 4.8. Assumptions Concerning Funding of LIBOR Loans	41
Article V. Conditions Precedent		41

- i -

	Section 5.1. Initial Conditions Precedent	41
	Section 5.2. Conditions Precedent to All Loans	43
	Section 5.3. Conditions as Covenants	44
Article VI. Representations and Warranties		44
	Section 6.1. Representations and Warranties	44
	Section 6.2. Survival of Representations and Warranties, Etc.	50
Article VII. Affirmative Covenants		50
	Section 7.1. Preservation of Existence and Similar Matters	50
	Section 7.2. Compliance with Applicable Law and Material Contracts	50
	Section 7.3. Maintenance of Property	50
	Section 7.4. Conduct of Business	51
	Section 7.5. Insurance	51
	Section 7.6. Payment of Taxes and Claims	51
	Section 7.7. Visits and Inspections	51
	Section 7.8. Use of Proceeds	52
	Section 7.9. Environmental Matters	52
	Section 7.10. Books and Records	52
	Section 7.11. Further Assurances	52
	Section 7.12. Guarantors	52
	Section 7.13. REIT Status	54
	Section 7.14. Exchange Listing	54
Article VIII. Information		54
	Section 8.1. Quarterly Financial Statements	54
	Section 8.2. Year‑End Statements	54
	Section 8.3. Compliance Certificate	54
	Section 8.4. Other Information	55
Article IX. Negative Covenants		56
	Section 9.1. Financial Covenants	56
	Section 9.2. Restricted Payments	57
	Section 9.3. Indebtedness	58
	Section 9.4. Liens; Negative Pledges; Other Matters	58
	Section 9.5. Merger, Consolidation, Sales of Assets and Other Arrangements	58
	Section 9.6. Fiscal Year	59
	Section 9.7. [Intentionally Omitted]	59
	Section 9.8. Modifications of Organizational Documents	59
	Section 9.9. Transactions with Affiliates	60
	Section 9.10. ERISA Exemptions	60
	Section 9.11. Foreign Assets Control	60
Article X. Default		60
	Section 10.1. Events of Default	60
	Section 10.2. Remedies Upon Event of Default	63

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LEGAL02/36006473v7

	Section 10.3. Remedies Upon Default		64
	Section 10.4. Allocation of Proceeds		64
	Section 10.5. Performance by Administrative Agent		65
	Section 10.6. Rights Cumulative		65
	Article XI. The Administrative Agent		66
	Section 11.1. Authorization and Action		66
	Section 11.2. Administrative Agent’s Reliance, Etc.		66
	Section 11.3. Notice of Defaults		67
	Section 11.4. Administrative Agent as Lender		67
	Section 11.5. Approvals of Lenders		67
	Section 11.6. Lender Credit Decision, Etc.		68
	Section 11.7. Indemnification of Administrative Agent		68
	Section 11.8. Successor Administrative Agent		69
	Section 11.9. Titled Agents		70
Article XII. Miscellaneous			70
	Section 12.1. Notices		70
	Section 12.2. Expenses		71
	Section 12.3. Setoff		72
	Section 12.4. Litigation; Jurisdiction; Other Matters; Waivers		72
	Section 12.5. Successors and Assigns		73
	Section 12.6. Amendments		77
	Section 12.7. Nonliability of Administrative Agent and Lenders		80
	Section 12.8. Confidentiality		80
	Section 12.9. Indemnification		81
	Section 12.10. Termination; Survival		82
	Section 12.11. Severability of Provisions		83
	Section 12.12. GOVERNING LAW		83
	Section 12.13. Counterparts		83
	Section 12.14. Obligations with Respect to Loan Parties		83
	Section 12.15. Limitation of Liability		83
	Section 12.16. Entire Agreement		84
	Section 12.17. Construction		84
	Section 12.18. Patriot Act		84
	Section 12.19. Headings		84
	SCHEDULE I	Commitments
	SCHEDULE 1.1	List of Loan Parties
	SCHEDULE 6.1.(b)	Ownership Structure
	SCHEDULE 6.1.(f)	Title to Properties; Liens
	SCHEDULE 6.1.(g)	Indebtedness and Guaranties

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LEGAL02/36006473v7

SCHEDULE 6.1.(i)	Litigation
SCHEDULE 6.1.(y)	Unencumbered Assets
EXHIBIT A	Form of Assignment and Acceptance Agreement
EXHIBIT B	Form of Notice of Borrowing
EXHIBIT C	Form of Notice of Continuation
EXHIBIT D	Form of Notice of Conversion
EXHIBIT E	Form of Term Note
EXHIBIT F	Form of Opinion of Counsel
EXHIBIT G	Form of Compliance Certificate
EXHIBIT H	Form of Guaranty
EXHIBIT I	Form of Guarantor Release Letter
EXHIBITS J-1 – J-4	Forms of U.S. Tax Compliance

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LEGAL02/36006473v7

THIS TERM LOAN AGREEMENT (this “Agreement”) dated as of December 17, 2015 by and among CORPORATE OFFICE PROPERTIES, L.P., a limited partnership formed under the laws of the State of Delaware (the “Borrower”), CORPORATE OFFICE PROPERTIES TRUST, a real estate investment trust formed under the laws of the State of Maryland (the “Parent”), each of the financial institutions initially a signatory hereto together with their assignees pursuant to Section 12.5., and CAPITAL ONE, NATIONAL ASSOCIATION, as Administrative Agent (the “Administrative Agent”), with CAPITAL ONE, NATIONAL ASSOCIATION, PNC CAPITAL MARKETS LLC and REGIONS CAPITAL MARKETS, A DIVISION OF REGIONS BANK, as Joint Lead Arrangers and Joint Bookrunners (collectively, the “Joint Lead Arrangers”), and PNC BANK, NATIONAL ASSOCIATION, and REGIONS BANK, as Syndication Agents (collectively, the “Syndication Agents”).

WHEREAS, the Administrative Agent and the Lenders desire to make available to the Borrower a delayed-draw term loan facility in the initial amount of $250,000,000 on the terms and conditions contained herein.

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged by the parties hereto, the parties hereto agree as follows:

ARTICLE I. DEFINITIONS

Section 1.1. Definitions.

In addition to terms defined elsewhere herein, the following terms shall have the following meanings for the purposes of this Agreement:

“Accession Agreement” means an Accession Agreement substantially in the form of Annex I to the Guaranty.

“Additional Costs” has the meaning given that term in Section 4.1.

“Additional Term Loan” means a loan made by a Lender to the Borrower pursuant to Section 2.9.

“Adjusted EBITDA” means, for any given period, (a) EBITDA for such period minus (b) Capital Reserves for such period.

“Adjusted LIBOR” means, with respect to each Interest Period for any LIBOR Loan, the rate obtained by dividing (a) LIBOR for such Interest Period by (b) a percentage equal to 1 minus the stated maximum rate (stated as a decimal) of all reserves, if any, required to be maintained with respect to Eurocurrency funding (currently referred to as “Eurocurrency liabilities”) as specified in Regulation D of the Board of Governors of the Federal Reserve System (or against any other category of liabilities which includes deposits by reference to which the interest rate on LIBOR Loans is determined or any applicable category of extensions of credit or other assets which includes loans by an office of any Lender outside of the United States of America to residents of the United States of America). Any change in such maximum rate shall result in a change in Adjusted LIBOR on the date on which such change in such maximum rate becomes effective.

“Adjusted Net Operating Income” means, with respect to a Property for any given period, Net Operating Income of such Property for such period minus Capital Reserves for such period.

- 1 -

“Administrative Agent” means Capital One, National Association, as contractual representative for the Lenders under the terms of this Agreement, and any successor Administrative Agent appointed pursuant to Section 11.8.

“Administrative Questionnaire” means an Administrative Questionnaire in a form supplied by the Administrative Agent to the Lenders from time to time.

“Affiliate” means, with respect to a specified Person, another Person that directly, or indirectly through one or more intermediaries, Controls or is Controlled by or is under common Control with the Person specified. In no event shall the Administrative Agent or any Lender be deemed to be an Affiliate of the Parent or the Borrower.

“Agreement Date” means the date as of which this Agreement is dated.

“Alternate Base Rate” means the per annum rate of interest equal to the greatest of (a) the Prime Rate, (b) the Federal Funds Rate plus one‑half of one percent (0.5%) and (c) LIBOR for a one-month Interest Period on such day (or if such day is not a Business Day, the immediately preceding Business Day) plus 1.0%. Any change in the Alternate Base Rate due to a change in the Prime Rate, the Federal Funds Rate or LIBOR shall be effective from and including the effective date of such change in the Prime Rate, the Federal Funds Rate or LIBOR, respectively (provided that clause (c) shall not be applicable during any period in which LIBOR is unavailable or unascertainable). For purposes of this definition, LIBOR referred to above shall be the rate for deposits in U.S. dollars for a one-month period in the London interbank market, as determined by Administrative Agent based on quotes or other information available to it, and shall not be required to be determined strictly in accordance with the requirements of the definition of “LIBOR” and the notice and other provisions applicable thereto as set forth herein.

“Anti-Corruption Laws” means all Applicable Laws of any jurisdiction concerning or relating to bribery, corruption or money laundering, including without limitation, the Foreign Corrupt Practices Act of 1977, as amended.

“Anti-Terrorism Laws” has the meaning given that term in Section 6.1.(z).

“Applicable Law” means all international, foreign, federal, state and local statutes, treaties, rules, guidelines, regulations, ordinances, codes, executive orders, and administrative or judicial precedents or authorities, including the interpretation or administration thereof by any Governmental Authority charged with the enforcement, interpretation or administration thereof, and all applicable administrative orders, directed duties, requests, licenses, authorizations and permits of, and agreements with, any Governmental Authority, in each case whether or not having the force of law.

“Applicable Margin” means, with respect to a particular Type of Loans, the percentage per annum determined, at any time, based on the range into which the Borrower’s Credit Rating then falls, in accordance with the levels in the table set forth below (each a “Level”). As of the Agreement Date, the Applicable Margin is determined based on Level 4. Any change in the Borrower’s Credit Rating which would cause it to move to a different Level in such table shall effect a change in the Applicable Margin on the Business Day on which such change occurs. During any period for which the Borrower has received a Credit Rating from only one Rating Agency, then the Applicable Margin shall be determined based on such Credit Rating. During any period that the Borrower has received only two Credit Ratings and such ratings are not equivalent, the Applicable Margin shall be determined by the higher of such two Credit Ratings so long as the next highest Credit Rating is only one Level below that of the highest Credit Rating, and if the next highest Credit

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Rating is more than one Level below that of the highest Credit Rating, then the Applicable Margin shall be determined by the Credit Rating that is one Level higher than the lower of the two Credit Ratings. During any period that the Borrower has received more than two Credit Ratings and such Credit Ratings are not equivalent, the Applicable Margin shall be determined by the higher of the two lowest Credit Ratings; provided, that if there is more than one Level between the two lowest Credit Ratings, then the Applicable Margin will be determined by the Credit Rating that is one Level higher than the lowest Credit Rating. During any period for which the Borrower does not have a Credit Rating from any Credit Agency, or during any other period not otherwise covered by this definition, the Applicable Margin shall be determined based on Level 5.

Level	Borrower’s Credit Rating (S&P/Moody’s or equivalent)	Applicable Margin for Loans that are LIBOR Loans	Applicable Margin for Loans that are Base Rate Loans
1	A-/A3 or higher	1.40%	0.40%
2	BBB+/Baa1	1.45%	0.45%
3	BBB/Baa2	1.55%	0.55%
4	BBB-/Baa3	1.80%	0.80%
5	Lower than BBB-/Baa3	2.35%	1.35%

“Approved Fund” means any Fund that is administered or managed by (a) a Lender, (b) an Affiliate of a Lender, or (c) an entity or an Affiliate of any entity that administers or manages a Lender.

“Assignment and Acceptance Agreement” means an Assignment and Acceptance Agreement among a Lender, an Eligible Assignee and the Administrative Agent, substantially in the form of Exhibit A.

“Availability Period” means the period from and including the Effective Date to but excluding the Availability Termination Date.

“Availability Termination Date” means the first to occur of: (a) September 17, 2016 and (b) the date on which the Commitments are terminated or reduced to zero in accordance herewith.

“Base Rate Loan” means a Loan (or any portion thereof) bearing interest at a rate based on the Alternate Base Rate.

“Benefit Arrangement” means at any time an employee benefit plan within the meaning of Section 3(3) of ERISA which is not a Plan or a Multiemployer Plan and which is maintained or otherwise contributed to by any member of the ERISA Group.

“Borrower” has the meaning set forth in the introductory paragraph hereof and shall include the Borrower’s successors and permitted assigns.

“Business Day” means any day other than a Saturday, Sunday or other day on which commercial banks are authorized to close under the Applicable Laws of, or are in fact closed in, the state where Administrative Agent’s Principal Office is located or the State of New York, and, if such day relates to the determination of LIBOR for any LIBOR Loan, means any such day that is also a London Banking Day.

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“Capital One” means Capital One, National Association, and its successors and assigns.

“Capital Reserves” means, for any period with respect to any developed Property, an amount equal to (a) $0.25 per square foot multiplied by (b) a fraction, the numerator of which is the number of days in such period and the denominator of which is 365. If the term Capital Reserves is used without reference to a specific Property, then the amount shall be determined on an aggregate basis with respect to all developed Property of the Parent and its Subsidiaries and a proportionate share of all developed Property of all Unconsolidated Affiliates. For purposes of this definition, once improvements related to the development of a Property have been completed for one year or such Property has achieved an Occupancy Rate of 85%, it shall be considered a developed Property.

“Capitalization Rate” means 7.00%.

“Capitalized Lease Obligation” means obligations under a lease (or other arrangement conveying the right to use property) to pay rent or other amounts that are required to be capitalized for financial reporting purposes in accordance with GAAP. The amount of a Capitalized Lease Obligation is the capitalized amount of such obligation as would be required to be reflected on a balance sheet of the applicable Person prepared in accordance with GAAP as of the applicable date.

“Cash Equivalents” means: (a) securities issued, guaranteed or insured by the United States of America or any of its agencies with maturities of not more than one year from the date acquired; (b) certificates of deposit with maturities of not more than one year from the date acquired, issued by a United States federal or state chartered commercial bank of recognized standing, or a commercial bank organized under the laws of any other country which is a member of the Organization for Economic Cooperation and Development, or a political subdivision of any such country, acting through a branch or agency, which bank has capital and unimpaired surplus in excess of $500,000,000 and which bank or its holding company has a short‑term commercial paper rating of at least A‑2 or the equivalent by S&P or at least P‑2 or the equivalent by Moody’s; (c) reverse repurchase agreements with terms of not more than seven days from the date acquired, for securities of the type described in clause (a) above and entered into only with commercial banks having the qualifications described in clause (b) above; (d) commercial paper issued by any Person incorporated under the laws of the United States of America or any State thereof and rated at least A‑2 or the equivalent thereof by S&P or at least P‑2 or the equivalent thereof by Moody’s, in each case with maturities of not more than one year from the date acquired; and (e) investments in money market funds registered under the Investment Company Act of 1940, which have net assets of at least $500,000,000 and at least 85% of whose assets consist of securities and other obligations of the type described in clauses (a) through (d) above.

“Commitment” means a Term Loan Commitment.

“Compliance Certificate” has the meaning given that term in Section 8.3.

“Construction-in-Process” means cash expenditures for land and improvements (including indirect costs internally allocated and development costs) determined in accordance with GAAP for all Properties that are under development or will commence development within twelve months from any date of determination.

“Continue”, “Continuation” and “Continued” each refers to the continuation of a LIBOR Loan from one Interest Period to another Interest Period pursuant to Section 2.6.

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“Control” means the possession, directly or indirectly, of the power to direct or cause the direction of the management or policies of a Person, whether through the ability to exercise voting power, by contract or otherwise. “Controlling” and “Controlled” have meanings correlative thereto.

“Controlled Property” means an Eligible Unencumbered Property that is not a Wholly-Owned Property and where the Parent or the Borrower directly or indirectly owns at least 80% of the Equity Interests of the Subsidiary that owns or leases such Property.

“Convert”, “Conversion” and “Converted” each refers to the conversion of a Loan of one Type into a Loan of another Type pursuant to Section 2.7.

“Credit Event” means either of the following: (a) the making (or deemed making) of any Loan and (b) the Conversion of a Base Rate Loan into a LIBOR Loan.

“Credit Rating” means the rating assigned by a Rating Agency to the senior unsecured long term Indebtedness of a Person.

“Debtor Relief Laws” means the Bankruptcy Code, and all other liquidation, conservatorship, bankruptcy, assignment for the benefit of creditors, moratorium, rearrangement, receivership, insolvency, reorganization, or similar Applicable Laws relating to the relief of debtors in the United States of America or other applicable jurisdictions from time to time in effect.

“Debt Service” means, for any period, the sum of (a) Interest Expense for such period, and (b) all regularly scheduled principal payments made with respect to Indebtedness of the Parent and its Subsidiaries during such period, other than any balloon, bullet, early repayment or similar principal payment which, in each case, repays such Indebtedness in full. Debt Service shall include a proportionate share of items (a) and (b) of all Unconsolidated Affiliates.

“Default” means any of the events specified in Section 10.1., whether or not there has been satisfied any requirement for the giving of notice, the lapse of time, or both.

“Defaulting Lender” means, subject to Section 3.11.(f), any Lender that (a) has failed to (i) fund all or any portion of its Loans within 2 Business Days of the date such Loans were required to be funded hereunder unless such Lender notifies the Administrative Agent and the Borrower in writing that such failure is the result of such Lender’s determination that one or more conditions precedent to funding (each of which conditions precedent, together with any applicable default, shall be specifically identified in such writing) has not been satisfied, or (ii) pay to the Administrative Agent or any Lender any other amount required to be paid by it hereunder within 2 Business Days of the date when due, (b) has notified the Borrower or the Administrative Agent in writing that it does not intend to comply with its funding obligations hereunder, or has made a public statement to that effect (unless such writing or public statement relates to such Lender’s obligation to fund a Loan hereunder and states that such position is based on such Lender’s determination that a condition precedent to funding (which condition precedent, together with any applicable default, shall be specifically identified in such writing or public statement) cannot be satisfied), (c) has failed, within 3 Business Days after written request by the Administrative Agent or the Borrower, to confirm in writing to the Administrative Agent and the Borrower that it will comply with its prospective funding obligations hereunder (provided that such Lender shall cease to be a Defaulting Lender pursuant to this clause (c) upon receipt of such written confirmation by the Administrative Agent and the Borrower), or (d) has, or has a direct or indirect parent company that has, (i) become the subject of a proceeding under any Debtor Relief Law, or (ii) had appointed for it a receiver, custodian, conservator, trustee, administrator, assignee for the

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benefit of creditors or similar Person charged with reorganization or liquidation of its business or assets, including the Federal Deposit Insurance Corporation or any other state or federal regulatory authority acting in such a capacity; provided that a Lender shall not be a Defaulting Lender solely by virtue of the ownership or acquisition of any equity interest in that Lender or any direct or indirect parent company thereof by a Governmental Authority so long as such ownership interest does not result in or provide such Lender with immunity from the jurisdiction of courts within the United States of America or from the enforcement of judgments or writs of attachment on its assets or permit such Lender (or such Governmental Authority) to reject, repudiate, disavow or disaffirm any contracts or agreements made with such Lender. Any determination by the Administrative Agent that a Lender is a Defaulting Lender under clauses (a) through (d) above shall be conclusive and binding absent manifest error, and such Lender shall be deemed to be a Defaulting Lender (subject to Section 3.11.(d)) upon delivery of written notice of such determination to the Borrower, the Administrative Agent and each Lender.

“Derivatives Contract” means any and all rate swap transactions, basis swaps, credit derivative transactions, forward rate transactions, commodity swaps, commodity options, forward commodity contracts, equity or equity index swaps or options, bond or bond price or bond index swaps or options or forward bond or forward bond price or forward bond index transactions, interest rate options, forward foreign exchange transactions, cap transactions, floor transactions, collar transactions, currency swap transactions, cross-currency rate swap transactions, currency options, spot contracts, or any other similar transactions or any combination of any of the foregoing (including any options to enter into any of the foregoing), whether or not any such transaction is governed by or subject to any master agreement. Not in limitation of the foregoing, the term “Derivatives Contract” includes any and all transactions of any kind, and the related confirmations, which are subject to the terms and conditions of, or governed by, any form of master agreement published by the International Swaps and Derivatives Association, Inc., any International Foreign Exchange Master Agreement, or any other master agreement, including any such obligations or liabilities under any such master agreement.

“Derivatives Termination Value” means, in respect of any one or more Derivatives Contracts, after taking into account the effect of any legally enforceable netting agreement relating to such Derivatives Contracts, (a) for any date on or after the date such Derivatives Contracts have been closed out and termination value(s) determined in accordance therewith, such termination value(s), and (b) for any date prior to the date referenced in clause (a) the amount(s) determined as the mark-to-market value(s) for such Derivatives Contracts, as determined based upon one or more mid-market or other readily available quotations provided by any recognized dealer in such Derivatives Contracts (which may include the Administrative Agent or any Lender).

“Development Property” means a Property which is under development or which (as determined in good faith by the Borrower) will commence development within twelve months of the date of determination. A Development Property shall cease to constitute a Development Property on the earlier of (a) the one year anniversary date of project completion and (b) the first day of the first full fiscal quarter after the project achieves an Occupancy Rate of 85%. For purposes of this definition, each individual phase of development of a data center shall be deemed to be a separate and distinct Property.

“Dollars” or “$” means the lawful currency of the United States of America.

“EBITDA” means, with respect to a Person for any period: (a) net income (or loss) of such Person for such period determined on a consolidated basis (excluding any income or losses from minority interests in the case of the Parent), in accordance with GAAP, exclusive of the following (but only to the extent included in determination of such net income (loss)): (i) depreciation and amortization expense; (ii) interest

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expense as determined in accordance with GAAP; (iii) income tax expense; (iv) extraordinary or non-recurring gains and losses (which would include, but not be limited to, the gains/losses from extinguishment of Indebtedness and impairment charges); (v) acquisition costs expensed but not capitalized; plus (b) such Person’s pro rata share of EBITDA of its Unconsolidated Affiliates. EBITDA shall be adjusted to remove any impact from straight line rent leveling adjustments required under GAAP and amortization of deferred market rent and expenses into income pursuant to FASB ASC 805. Notwithstanding the foregoing, gains and losses from land sales associated with Development Properties and other land shall be included in EBITDA.

“Effective Date” means the later of: (a) the Agreement Date; and (b) the date on which all of the conditions precedent set forth in Section 5.1. shall have been fulfilled or waived by all of the Lenders.

“Eligible Assignee” means (a) a Lender, (b) an Affiliate of a Lender, (c) an Approved Fund and (d) any other Person (other than a natural person) approved by the Administrative Agent (such approval not to be unreasonably withheld or delayed); provided, that notwithstanding the foregoing, “Eligible Assignee” shall not include (A) the Parent or the Borrower or any of their respective Affiliates or Subsidiaries, (B) an Affiliate of a Lender or an Approved Fund that (1) if organized under the laws of the United States of America, any state thereof or the District of Columbia, does not have total assets in excess of $5,000,000,000, or if organized under the laws of any other country or a political subdivision thereof, is not organized in such a country that is a member of the Organization for Economic Co-operation and Development, does not have total assets in excess of $10,000,000,000, or does not act through a branch or agency located in the United States or (2) does not have a rating of BBB or higher by S&P, Baa2 or higher by Moody’s or the equivalent or higher of either such rating by another rating agency acceptable to the Administrative Agent with respect to such Affiliate of a Lender or Approved Fund’s (or if such Affiliate or Approved Fund is a Subsidiary, such Affiliate’s or Approved Fund’s Parent’s) senior unsecured long term indebtedness, or (C) a Defaulting Lender.

“EligibleGround Lease”means a ground lease containing the following terms and conditions: (a) a remaining term (inclusive of any unexercised extension or renewal options that are exercisable without condition (other than a condition that no default exists under such ground lease at the time of exercise of such extension or renewal option)) of thirty (30) years or more from the Agreement Date; (b) the right of the lessee to mortgage and encumber its interest in the leased property without the consent of the lessor; (c) the obligation of the lessor to give the holder of any mortgage Lien on such leased property written notice of any defaults on the part of the lessee and agreement of such lessor that such lease will not be terminated until such holder has had a reasonable opportunity to cure or complete foreclosures, and fails to do so; (d) reasonable transferability of the lessee’s interest under such lease, including ability to sublease; and (e) such other rights customarily required by mortgagees making a loan secured by the interest of the holder of the leasehold estate demised pursuant to a ground lease.

“Eligible Unencumbered Property” means a Property which satisfies all of the following requirements:  (a) such Property is located in the United States of America; (b) neither such Property, nor any interest of the Parent, the Borrower or any Subsidiary thereof therein, is subject to any Lien (other than Permitted Liens described in clauses (a) through (f) of the definition thereof) or any Negative Pledge; (c) if such Property is owned by a Subsidiary, none of the Borrower’s or the Parent’s direct or indirect ownership interest in such Subsidiary is subject to any Lien (other than Permitted Liens described in clauses (a) through (f) of the definition thereof) or any Negative Pledge; (d) if such Property is owned by a Subsidiary, the Parent or the Borrower directly, or indirectly through a Subsidiary, has the right to take the following actions without the need to obtain the consent of any Person:  (A) to create Liens on such Property as security for Indebtedness of the Parent, the Borrower or such Subsidiary, as applicable and (B) to sell, transfer or otherwise dispose of such Property; (e) such Property is owned in fee simple, or leased under an Eligible Ground Lease, by

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(A) the Parent, (B) the Borrower, or (C) a Subsidiary that (i) has not incurred, acquired or suffered to exist any Recourse Indebtedness and (ii) is not owned directly or indirectly by a Subsidiary (other than the Borrower) that has incurred, acquired or suffered to exist any Recourse Indebtedness unless, in each case, at the time of determining whether such Property satisfies the requirement in this clause (e), the Borrower does not have an Investment Grade Rating and such Subsidiary that owns or leases such Property is required to be and has become a party to the Guaranty in accordance with Section 7.12.(a); and (f) such Property is free of all structural defects or major architectural deficiencies, title defects, environmental conditions or other adverse matters except for defects, deficiencies, conditions or other matters individually or collectively which are not material to the profitable operation of such Property.

“Environmental Laws” means any Applicable Law relating to environmental protection or the manufacture, storage, remediation, disposal or clean‑up of Hazardous Materials including, without limitation, the following: Clean Air Act, 42 U.S.C. § 7401 et seq.; Federal Water Pollution Control Act, 33 U.S.C. § 1251 et seq.; Solid Waste Disposal Act, as amended by the Resource Conservation and Recovery Act, 42 U.S.C. § 6901 et seq.; Comprehensive Environmental Response, Compensation and Liability Act, 42 U.S.C. § 9601 et seq.; National Environmental Policy Act, 42 U.S.C. § 4321 et seq.; regulations of the Environmental Protection Agency and any applicable rule of common law and any judicial interpretation thereof relating primarily to the environment or Hazardous Materials and any analogous or comparable state or local laws, regulations or ordinances that concern Hazardous Materials or protection of the environment.

“Equity Interest” means, with respect to any Person, any share of capital stock of (or other ownership or profit interests in) such Person, any warrant, option or other right for the purchase or other acquisition from such Person of any share of capital stock of (or other ownership or profit interests in) such Person, any security convertible into or exchangeable for any share of capital stock of (or other ownership or profit interests in) such Person or warrant, right or option for the purchase or other acquisition from such Person of such shares (or such other interests), and any other ownership or profit interest in such Person (including, without limitation, partnership, member or trust interests therein), whether voting or nonvoting, and whether or not such share, warrant, option, right or other interest is authorized or otherwise existing on any date of determination.

“Equity Issuance” means any issuance or sale by a Person of any Equity Interest and shall in any event include the issuance of any Equity Interest upon the conversion or exchange of any security constituting Indebtedness that is convertible or exchangeable, or is being converted or exchanged, for Equity Interests.

“ERISA” means the Employee Retirement Income Security Act of 1974, as in effect from time to time.

“ERISA Event” means, with respect to the ERISA Group, (a) any “reportable event” as defined in Section 4043 of ERISA with respect to a Plan (other than an event for which the 30‑day notice period is waived); (b) the withdrawal of a member of the ERISA Group from a Plan subject to Section 4063 of ERISA during a plan year in which it was a “substantial employer” as defined in Section 4001(a)(2) of ERISA or a cessation of operations that is treated as such a withdrawal under Section 4062(e) of ERISA; (c) the incurrence by a member of the ERISA Group of any liability with respect to the withdrawal or partial withdrawal from any Multiemployer Plan; (d) the incurrence by any member of the ERISA Group of any liability under Title IV of ERISA with respect to the termination of any Plan or Multiemployer Plan; (e) the institution of proceedings to terminate a Plan or Multiemployer Plan by the PBGC; (f) the failure by any member of the ERISA Group to make when due required contributions to a Multiemployer Plan or Plan unless such failure is cured within 30 days or the filing pursuant to Section 412(c) of the Internal Revenue Code or Section 302(c) of ERISA of an application for a waiver of the minimum funding standard; (g) any other event or condition

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that might reasonably be expected to constitute grounds under Section 4042 of ERISA for the termination of, or the appointment of a trustee to administer, any Plan or Multiemployer Plan or the imposition of liability under Section 4069 or 4212(c) of ERISA; (h) the receipt by any member of the ERISA Group of any notice or the receipt by any Multiemployer Plan from any member of the ERISA Group of any notice, concerning the imposition of Withdrawal Liability or a determination that a Multiemployer Plan is, or is expected to be, insolvent (within the meaning of Section 4245 of ERISA), in reorganization (within the meaning of Section 4241 of ERISA), or in “critical” status (within the meaning of Section 432 of the Internal Revenue Code or Section 305 of ERISA); (i) the imposition of any liability under Title IV of ERISA, other than for PBGC premiums due but not delinquent under Section 4007 of ERISA, upon any member of the ERISA Group or the imposition of any Lien in favor of the PBGC under Title IV of ERISA; or (j) a determination that a Plan is, or is reasonably expected to be, in “at risk” status (within the meaning of Section 430 of the Internal Revenue Code or Section 303 of ERISA).

“ERISA Group” means the Parent, any Subsidiary and all members of a controlled group of corporations and all trades or businesses (whether or not incorporated) under common control, which, together with the Parent or any Subsidiary, are treated as a single employer under Section 414 of the Internal Revenue Code.

“Event of Default” means any of the events specified in Section 10.1., provided that any requirement for notice or lapse of time or any other condition has been satisfied.

“Exchange Act” has the meaning given that term in Section 10.1.(m)(i).

“Excluded Subsidiary” means any Subsidiary which holds title to assets which are or are to become collateral for any Secured Indebtedness of such Subsidiary.

“Excluded Taxes” means any of the following Taxes imposed on or with respect to a Recipient or required to be withheld or deducted from a payment to a Recipient, (a) Taxes imposed on or measured by net income (however denominated), franchise Taxes, and branch profits Taxes, in each case, (i) imposed as a result of such Recipient being organized under the laws of, or having its principal office or, in the case of any Lender, its applicable Lending Office located in, the jurisdiction imposing such Tax (or any political subdivision thereof) or (ii) that are Other Connection Taxes, (b) in the case of a Lender, U.S. federal withholding Taxes imposed on amounts payable to or for the account of such Lender with respect to an applicable interest in a Loan or Commitment pursuant to an Applicable Law in effect on the date on which (i) such Lender acquires such interest in the Loan or Commitment or (ii) such Lender changes its lending office, except in each case to the extent that, pursuant to Section 3.12., amounts with respect to such Taxes were payable either to such Lender’s assignor immediately before such Lender became a party hereto or to such Lender immediately before it changed its lending office, (c) Taxes attributable to such Recipient’s failure to comply with Section 3.12.(g) and (d) any U.S. federal withholding Taxes imposed under FATCA.

“Existing Credit Agreement” means that certain Amended, Restated and Consolidated Credit Agreement dated as of May 6, 2015, among the Borrower, the Parent, the financial institutions from time to time party thereto, Keybank National Association, as administrative agent, and the other parties thereto.

“Existing Term Loan Agreement” means that certain Term Loan Agreement dated as of September 1, 2011, among the Borrower, the Parent, the financial institutions from time to time party thereto, KeyBank National Association, as agent, and the other parties thereto.

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“Fair Market Value” means, with respect to (a) a security listed on a national securities exchange or the NASDAQ National Market, the price of such security as reported on such exchange by any widely recognized reporting method customarily relied upon by financial institutions and (b) with respect to any other property, the price which could be negotiated in an arm’s-length free market transaction, for cash, between a willing seller and a willing buyer, neither of which is under pressure or compulsion to complete the transaction.

“FASB ASC” means the Accounting Standards Codification of the Financial Accounting Standards Board.    

“FATCA” means Sections 1471 through 1474 of the Internal Revenue Code, as of the date of this Agreement (or any amended or successor version that is substantively comparable and not materially more onerous to comply with) and any current or future regulations or official interpretations thereof and any agreements entered into pursuant to Section 1471(b)(1) of the Internal Revenue Code.

“Federal Funds Rate” means, for any day, the rate per annum (rounded upward to the nearest 1/100th of 1%) equal to the weighted average of the rates on overnight Federal funds transactions with members of the Federal Reserve System arranged by Federal funds brokers on such day, as published by the Federal Reserve Bank of New York on the Business Day next succeeding such day, provided that (a) if such day is not a Business Day, the Federal Funds Rate for such day shall be such rate on such transactions on the next preceding Business Day, and (b) if no such rate is so published on such next succeeding Business Day, the Federal Funds Rate for such day shall be the average rate quoted to the Administrative Agent by federal funds dealers selected by the Administrative Agent on such day on such transaction as determined by the Administrative Agent.

“Fees” means the fees and commissions provided for or referred to in Section 3.6. and any other fees payable by the Borrower hereunder or under any other Loan Document.

“Fitch” means Fitch Ratings Ltd., and its successors.

“Fixed Charges” means, for any period, the sum of (a) Debt Service and (b) all Preferred Dividends paid during such period. Fixed Charges shall include a proportionate share of items (a) and (b) with respect to all Unconsolidated Affiliates.

“Foreign Lender” means (a) if the Borrower is a U.S. Person, a Lender that is not a U.S. Person, and (b) if the Borrower is not a U.S. Person, a Lender that is resident or organized under the laws of a jurisdiction other than that in which the Borrower is resident for tax purposes.

“Fund” means any Person (other than a natural person) that is (or will be) engaged in making, purchasing, holding or otherwise investing in commercial loans and similar extensions of credit in the ordinary course of its business.

“Funds From Operations” means, for a given period, income of the Parent and its Subsidiaries available for common shareholders before depreciation and amortization of real estate assets and before extraordinary items less gains and losses on sale of real estate determined on a consolidated basis in accordance with GAAP applied on a consistent basis for such period. Adjustments for Unconsolidated Affiliates will be calculated to reflect the Borrower’s pro rata share of funds from operations on the same basis.

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“GAAP” means generally accepted accounting principles in the United States of America set forth in the opinions and pronouncements of the Accounting Principles Board of the American Institute of Certified Public Accountants and statements and pronouncements of the Financial Accounting Standards Board (including Statement of Financial Accounting Standards No. 168, “The FASB Accounting Standards Codification”) or in such other statements by such other entity as may be approved by a significant segment of the accounting profession in the United States of America, which are applicable to the circumstances as of the date of determination.

“Governmental Approvals” means all authorizations, consents, approvals, licenses and exemptions of, registrations and filings with, and reports to, all Governmental Authorities.

“Governmental Authority” means any national, state or local government (whether domestic or foreign), any political subdivision thereof or any other governmental, quasi-governmental, judicial, public or statutory instrumentality, authority, body, agency, bureau, commission, board, department or other entity (including, without limitation, the Federal Deposit Insurance Corporation, the Comptroller of the Currency or the Federal Reserve Board, any central bank or any comparable authority) or any arbitrator with authority to bind a party at law.

“Guarantor” means any Person that is a party to the Guaranty as a “Guarantor” and in any event shall include the Parent.

“Guarantor ReleaseLetter” means a letter executed by the Administrative Agent that confirms the release of one or more Guarantor(s), substantially in the form of Exhibit I.

“Guaranty”, “Guaranteed”, “Guarantying” or to “Guarantee” as applied to any obligation means and includes: (a) a guaranty (other than by endorsement of negotiable instruments for collection or deposit in the ordinary course of business), directly or indirectly, in any manner, of any part or all of such obligation, or (b) an agreement, direct or indirect, contingent or otherwise, and whether or not constituting a guaranty, the practical effect of which is to assure the payment or performance (or payment of damages in the event of nonperformance) of any part or all of such obligation whether by: (i) the purchase of securities or obligations, (ii) the purchase, sale or lease (as lessee or lessor) of property or the purchase or sale of services primarily for the purpose of enabling the obligor with respect to such obligation to make any payment or performance (or payment of damages in the event of nonperformance) of or on account of any part or all of such obligation, or to assure the owner of such obligation against loss, (iii) the supplying of funds to or in any other manner investing in the obligor with respect to such obligation, (iv) repayment of amounts drawn down by beneficiaries of letters of credit, or (v) the supplying of funds to or investing in a Person on account of all or any part of such Person’s obligation under a Guaranty of any obligation or indemnifying or holding harmless, in any way, such Person against any part or all of such obligation. As the context requires, “Guaranty” shall also mean the Guaranty to which the Guarantors are parties substantially in the form of Exhibit H.

“Hazardous Materials” means all or any of the following: (a) substances that are defined or listed in, or otherwise classified pursuant to, any applicable Environmental Laws as “hazardous substances”, “hazardous materials”, “hazardous wastes”, “toxic substances” or any other formulation intended to define, list or classify substances by reason of deleterious properties such as ignitability, corrosivity, reactivity, carcinogenicity, reproductive toxicity, “TCLP” toxicity or “EP toxicity”; (b) oil, petroleum or petroleum derived substances, natural gas, natural gas liquids or synthetic gas and drilling fluids, produced waters and other wastes associated with the exploration, development or production of crude oil, natural gas or geothermal resources; (c) any flammable substances or explosives or any radioactive materials; (d) asbestos

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in any form; (e) toxic mold; and (f) electrical equipment which contains any oil or dielectric fluid containing levels of polychlorinated biphenyls in excess of fifty parts per million.

“Indebtedness” means, with respect to a Person, at the time of computation thereof, all of the following (without duplication): (a) all obligations of such Person in respect of money borrowed; (b) all obligations of such Person, whether or not for money borrowed (i) represented by notes payable, or drafts accepted, in each case representing extensions of credit, (ii) evidenced by bonds, debentures, notes or similar instruments, or (iii) constituting purchase money indebtedness, conditional sales contracts, title retention debt instruments or other similar instruments, upon which interest charges are customarily paid or that are issued or assumed as full or partial payment for property or services rendered; (c) Capitalized Lease Obligations of such Person; (d) all reimbursement obligations of such Person under any letters of credit or acceptances (whether or not the same have been presented for payment); (e) all Off-Balance Sheet Obligations of such Person; (f) all obligations of such Person in respect of any purchase obligation, repurchase obligation, takeout commitment or forward equity commitment, in each case evidenced by a binding agreement (excluding any such obligation to the extent the obligation can be satisfied by the issuance of Equity Interests); (g) net obligations under any Derivatives Contract not entered into as a hedge against existing Indebtedness or Indebtedness to be entered into within 6 months of the time of computation, in an amount equal to the Derivatives Termination Value thereof; (h) all Indebtedness of other Persons which such Person has Guaranteed or is otherwise recourse to such Person (except for guaranties of customary exceptions for fraud, misapplication of funds, environmental indemnities, voluntary bankruptcy, involuntary bankruptcy and other similar exceptions to nonrecourse liability); (i) all Indebtedness of another Person secured by (or for which the holder of such Indebtedness has an existing right, contingent or otherwise, to be secured by) any Lien on property or assets owned by such Person, even though such Person has not assumed or become liable for the payment of such Indebtedness or other payment obligation; and (j) such Person’s pro rata share of the Indebtedness of any Unconsolidated Affiliate of such Person. Indebtedness of any Person shall include Indebtedness of any partnership or joint venture in which such Person is a general partner or joint venturer to the extent of such Person’s pro rata share of the ownership of such partnership or joint venture (except if such Indebtedness, or portion thereof, is recourse to such Person, in which case the greater of such Person’s pro rata portion of such Indebtedness or the amount of the recourse portion of the Indebtedness, shall be included as Indebtedness of such Person). All Loans shall constitute Indebtedness of the Borrower.

“Indemnified Taxes” means (a) Taxes, other than Excluded Taxes, imposed on or with respect to any payment made by or on account of any obligation of the Borrower or any other Loan Party under any Loan Document and (b) to the extent not otherwise described in the immediately preceding clause (a), Other Taxes.

“Intangible Assets” of any Person means at any date the amount of (i) all write‑ups (other than write‑ups resulting from write‑ups of assets of a going concern business made within twelve months after the acquisition of such business) in the book value of any asset owned by such Person and (ii) all unamortized debt discount and expense, unamortized deferred charges, capitalized start‑up costs, goodwill, patents, licenses, trademarks, trade names, copyrights, organization or developmental expenses, covenants not to compete and other intangible items.

“Intellectual Property” has the meaning given that term in Section 6.1.(t).

“Interest Expense” means, for any period of determination, (a) the total interest expense of the Parent and its Subsidiaries, determined on a consolidated basis for such period and in accordance with GAAP (excluding (i)  any non-cash portion of interest expense attributable to “convertible debt” under FASB ASC 470-20, (ii) amortization of deferred financing costs, and (iii) non-cash interest related to the reclassification

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of accumulated other comprehensive income (loss) related to settled hedges) plus (b) to the extent not already included in the foregoing clause (a), the Parent’s pro rata share of Interest Expense from Unconsolidated Affiliates of the Parent for such period.

“Interest Period” means with respect to any LIBOR Loan, each period commencing on the date such LIBOR Loan is made or the last day of the next preceding Interest Period for such Loan and ending 7 days, or 1, 2, 3 or 6 months thereafter, as the Borrower may select in a Notice of Borrowing, Notice of Continuation or Notice of Conversion, as the case may be, except that each Interest Period (other than an Interest Period of 7-days’ duration) that commences on the last Business Day of a calendar month shall end on the last Business Day of the appropriate subsequent calendar month. Notwithstanding the foregoing: (i) if any Interest Period would otherwise end after the Maturity Date, such Interest Period shall end on the Maturity Date; and (ii) each Interest Period that would otherwise end on a day which is not a Business Day shall end on the immediately following Business Day (or, if such immediately following Business Day falls in the next calendar month, on the immediately preceding Business Day).

“Internal Revenue Code” means the Internal Revenue Code of 1986, as amended.

“Investment” means, (x) with respect to any Person, any acquisition or investment (whether or not of a controlling interest) by such Person, by means of any of the following: (a) the purchase or other acquisition of any Equity Interest in another Person, (b) a loan, advance or extension of credit to, capital contribution to, Guaranty of Indebtedness of, or purchase or other acquisition of any Indebtedness of, another Person, including any partnership or joint venture interest in such other Person, or (c) the purchase or other acquisition (in one transaction or a series of transactions) of assets of another Person that constitute the business or a division or operating unit of another Person and (y) with respect to any Property or other asset, the acquisition thereof. Any binding commitment to make an Investment in any other Person, as well as any option of another Person to require an Investment in such Person, shall constitute an Investment. Except as expressly provided otherwise, for purposes of determining compliance with any covenant contained in a Loan Document, the amount of any Investment shall be the amount actually invested, without adjustment for subsequent increases or decreases in the value of such Investment.

“Investment Grade Rating” means a Credit Rating of BBB-/Baa3 (or equivalent) or higher from a Rating Agency.

“Joint Lead Arrangers” means Capital One, National Association, PNC Capital Markets LLC and Regions Capital Markets, a division of Regions Bank, together with their respective successors and permitted assigns.

“Lender” means each financial institution from time to time party hereto as a “Lender”, in each case, together with its respective successors and permitted assigns.

“Lending Office” means, for each Lender and for each Type of Loan, the office of such Lender specified in such Lender’s Administrative Questionnaire, or such other office of such Lender of which such Lender may notify the Administrative Agent in writing from time to time.

“Level” has the meaning given that term in the definition of the term “Applicable Margin.”

“LIBOR” means, for any LIBOR Loan for any Interest Period therefor, the London interbank offered rate (rounded upwards, if necessary, to the nearest 1/100 of 1%) administered by the ICE Benchmark Administration (or any other Person that takes over the administration of such rate for Dollars) for a period

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equal in length to such Interest Period as displayed on pages LIBOR01 or LIBOR02 of the Reuters screen or, in the event such rate does not appear on a Reuters page or screen, on any successor or substitute page on such screen that displays such rate, or on the appropriate page of such other information service that publishes such rate as shall be selected by the Administrative Agent from time to time in its reasonable discretion (the “LIBOR Screen Rate”) at approximately 11:00 a.m. (London time) two Business Days prior to the first day of such Interest Period for a term comparable to such Interest Period. If for any reason such rate is not available, the term “LIBOR” shall mean, for any LIBOR Loan for any Interest Period therefor, the applicable British Bankers’ Association LIBOR rate for deposits in Dollars as reported by any generally recognized financial information service as of 11:00 a.m. (London time) two Business Days prior to the first day of such Interest Period, and having a maturity equal to such Interest Period. If for any reason the LIBOR Screen Rate shall not be available at such time for a period equal in length to such Interest Period, then LIBOR shall be an interpolated rate as determined by the Administrative Agent at such time to be the rate at which Capital One or one of its affiliate banks offers to place deposits in Dollars with first class banks in the London interbank market at approximately 11:00 a.m. (London time) two Business Days prior to the first day of such Interest Period, in the approximate amount of the relevant LIBOR Loan and having a maturity equal to such Interest Period. If LIBOR determined as provided above would be less than zero, LIBOR shall be deemed to be zero. Notwithstanding the above, to the extent that “LIBOR” or “Adjusted LIBOR” is used in connection with a Base Rate Loan, such rate shall be determined as modified by the definition of Alternate Base Rate.

“LIBOR Loan” means a Loan (or any portion thereof) (other than a Base Rate Loan) bearing interest at a rate based on LIBOR.

“Lien” as applied to the property of any Person means: (a) any security interest, encumbrance, mortgage, deed to secure debt, deed of trust, assignment of leases and rents, pledge, lien, charge or lease constituting a Capitalized Lease Obligation, conditional sale or other title retention agreement, or other security title or encumbrance of any kind in respect of any property of such Person, or upon the income, rents or profits therefrom; (b) any arrangement, express or implied, under which any property of such Person is transferred, sequestered or otherwise identified for the purpose of subjecting the same to the payment of Indebtedness or performance of any other obligation in priority to the payment of the general, unsecured creditors of such Person; (c) the filing of any financing statement under the Uniform Commercial Code or its equivalent in any jurisdiction, other than any precautionary filing not otherwise constituting or giving rise to a Lien, including a financing statement filed (i) in respect of a lease not constituting a Capitalized Lease Obligation pursuant to Section 9-505 (or a successor provision) of the Uniform Commercial Code or its equivalent as in effect in an applicable jurisdiction or (ii) in connection with a sale or other disposition of accounts or other assets not prohibited by this Agreement in a transaction not otherwise constituting or giving rise to a Lien; and (d) any agreement by such Person to grant, give or otherwise convey any of the foregoing.

“Loan” means a Term Loan.

“Loan Document” means this Agreement, each Note, the Guaranty and each other document or instrument now or hereafter executed and delivered by a Loan Party in connection with, pursuant to or relating to this Agreement.

“Loan Party” means each of the Borrower, the Parent and each other Person who guarantees all or a portion of the Obligations and/or who pledges any collateral security to secure all or a portion of the Obligations. Schedule 1.1. sets forth the Loan Parties in addition to the Borrower and the Parent, if any, as of the Agreement Date.

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“London Banking Day” means any day on which dealings in Dollar deposits are conducted by and between banks in the London interbank eurodollar market.

“Marketable Securities” means (a) common or preferred Equity Interests of Persons located in, and formed under the laws of, any State of the United States of America or the District of Columbia, which Equity Interests are subject to price quotations (quoted at least daily) on The NASDAQ Stock Market’s National Market System or have trading privileges on the New York Stock Exchange, the NYSE MKT LLC or another recognized national United States securities exchange and (b) securities evidencing Indebtedness issued by Persons located in, and formed under the laws of, any State of the United States of America or the District of Columbia, which Persons have a Credit Rating of BBB-or Baa3 or better.

“Material Adverse Effect” means a materially adverse effect on (a) the business, assets, liabilities, condition (financial or otherwise), results of operations or business prospects of the Parent and its Subsidiaries taken as a whole, (b) the ability of the Borrower or any other Loan Party to perform its obligations under any Loan Document to which it is a party, (c) the validity or enforceability of any of the Loan Documents, (d) the rights and remedies of the Lenders and the Administrative Agent under any of the Loan Documents or (e) the timely payment of the principal of or interest on the Loans or other amounts payable in connection therewith or the timely payment of all Reimbursement Obligations.

“Material Contract” means any contract or other arrangement (other than Loan Documents), whether written or oral, to which the Parent, the Borrower, any Subsidiary or any other Loan Party is a party as to which the breach, nonperformance, cancellation or failure to renew by any party thereto could reasonably be expected to have a Material Adverse Effect.

“Material Subsidiary” means any Subsidiary that meets either of the following conditions: (a) the Parent and its other Subsidiaries’ investments in and advances to the Subsidiary exceed 10.0% of the Parent and its Subsidiaries’ total assets consolidated (determined in accordance with GAAP) as of the end of the most recent fiscal quarter for which a periodic report has been filed under the Exchange Act; or (b) the Parent and its Subsidiaries’ proportionate share of the total assets (after intercompany eliminations) of the Subsidiary exceed 10.0% of the Parent and its Subsidiaries’ total assets consolidated (determined in accordance with GAAP) as of the end of the most recent fiscal quarter for which a periodic report has been filed under the Exchange Act.

“Maturity Date” means December 17, 2022.

“Moody’s” means Moody’s Investors Service, Inc., and its successors.

“Mortgage” means a mortgage, deed of trust, deed to secure debt or similar security instrument made by a Person owning an interest in real property granting a Lien on such interest in real property as security for the payment of Indebtedness of such Person or another Person.

“Mortgage Receivable” means a promissory note secured by a Mortgage of which the Borrower, a Guarantor or one of their respective Subsidiaries is the holder and retains the rights of collection of all payments thereunder.

“Multiemployer Plan” means at any time a multiemployer plan within the meaning of Section 4001(a)(3) of ERISA to which any member of the ERISA Group is then making or accruing an obligation to make

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contributions or has within the preceding five plan years made contributions, including for these purposes any Person which ceased to be a member of the ERISA Group during such five year period.

“Negative Pledge” means, with respect to a given asset, any provision of a document, instrument or agreement (other than any Loan Document) which prohibits or purports to prohibit the creation or assumption of any Lien on such asset as security for Indebtedness of the Person owning such asset or any other Person; provided, however, that an agreement that conditions a Person’s ability to encumber its assets upon the maintenance of one or more specified ratios that limit such Person’s ability to encumber its assets but that do not generally prohibit the encumbrance of its assets, or the encumbrance of specific assets, shall not constitute a Negative Pledge.

“Net Operating Income” means, with respect to any Property for any period, the sum of the following (without duplication): (a) rents and other revenues earned in the ordinary course from such Property (excluding pre-paid rents and revenues and security deposits except to the extent applied in satisfaction of tenants’ obligations for rent) minus (b) all expenses paid or accrued related to the ownership, operation or maintenance of such Property, including but not limited to taxes, assessments and the like, insurance, utilities, payroll costs, maintenance, repair and landscaping expenses, marketing expenses, and general and administrative expenses (including an appropriate allocation for legal, accounting, advertising, marketing and other expenses incurred in connection with such Property, but specifically excluding general overhead expenses of the Parent or any Subsidiary and any property management fees) minus (c) the greater of (i) the actual property management fee paid during such period and (ii) an imputed management fee in the amount of 3.0% of the gross revenues for such Property for such period. Net Operating Income of any Person shall include such Person’s pro rata share of Net Operating Income of its Unconsolidated Affiliates. Net Operating Income shall be adjusted to remove any impact from straight line rent leveling adjustments required under GAAP and amortization of deferred market rent and expenses into income pursuant to FASB ASC 805. If for a period, the sum derived from the foregoing calculation for a Property is a negative number, the Net Operating Income of such Property shall be deemed to be zero for such period.

“Net Proceeds” means, with respect to any Equity Issuance by a Person, the aggregate amount of all cash and the Fair Market Value of all other property received by such Person in respect of such Equity Issuance net of investment banking fees, legal fees, accountants’ fees, underwriting discounts and commissions and other customary fees and expenses actually incurred by such Person in connection with such Equity Issuance.

“Nonrecourse Indebtedness” means, with respect to a Person, Indebtedness for borrowed money (other than construction completion guarantees with respect to Development Properties) in respect of which recourse for payment is contractually limited to specific assets of such Person encumbered by a Lien securing such Indebtedness; provided such contractual limitation to specific assets may include customary exceptions for fraud, misapplication of funds, environmental indemnities, voluntary bankruptcy, collusive involuntary bankruptcy and other similar exceptions to nonrecourse liability.

“Note” means a Term Note.

“Notice of Borrowing” means a notice substantially in the form of Exhibit B (or such other form reasonably acceptable to the Administrative Agent and containing the information required in such Exhibit) to be delivered to the Administrative Agent pursuant to Section 2.1.(b) evidencing the Borrower’s request for a borrowing of Term Loans.

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“Notice of Continuation” means a notice in the form of Exhibit C to be delivered to the Administrative Agent pursuant to Section 2.6. evidencing the Borrower’s request for the Continuation of a LIBOR Loan.

“Notice of Conversion” means a notice in the form of Exhibit D to be delivered to the Administrative Agent pursuant to Section 2.7. evidencing the Borrower’s request for the Conversion of a Loan from one Type to another Type.

“Obligations” means, individually and collectively: (a) the aggregate principal balance of, and all accrued and unpaid interest on, all Loans and (b) all other indebtedness, liabilities, obligations, covenants and duties of the Borrower and the other Loan Parties owing to the Administrative Agent or any Lender of every kind, nature and description, under or in respect of this Agreement or any of the other Loan Documents, including, without limitation, the Fees and indemnification obligations, whether direct or indirect, absolute or contingent, due or not due, contractual or tortious, liquidated or unliquidated, and whether or not evidenced by any promissory note.

“Occupancy Rate” means, with respect to a Property at any time, the ratio, expressed as a percentage, of (a) the net rentable square footage of such Property occupied by tenants that are not Affiliates paying rent at market rates pursuant to binding leases as to which no monetary default has occurred and is continuing to (b) the aggregate net rentable square footage of such Property; provided, however, for purposes of the immediately preceding clause (a): (i) if such tenant has executed a lease for space in such Property and the Borrower or such tenant’s agents are in the process of preparing such space for physical occupancy, then such space shall be considered occupied and (ii) net rentable square footage occupied by the Parent or any Affiliate paying rent at market rates pursuant to binding leases as to which no monetary default has occurred and is continuing (“Affiliate Rented Space”) may be included in such calculation; provided, no more than 30,000 square feet of Affiliate Rented Space shall be used in the calculation of Occupancy Rates of the Properties; provided, further, to the extent Affiliate Rented Space exceeds 30,000 square feet in the aggregate with respect to all Properties, such excess shall be allocated pro rata among each Property with respect to which Affiliate Rented Space was included in the calculation of the Occupancy Rate for such Property to reduce the Affiliate Rented Space used in such calculation.

“OFAC” means U.S. Department of the Treasury’s Office of Foreign Assets Control and any successor Governmental Authority.

“Off-Balance Sheet Obligations” means liabilities and obligations of the Parent, the Borrower, any Subsidiary or any other Person in respect of “off-balance sheet arrangements” (as defined in the SEC Off-Balance Sheet Rules) which the Parent would be required to disclose in the “Management’s Discussion and Analysis of Financial Condition and Results of Operations” section of the Parent’s report on Form 10‑Q or Form 10‑K (or their equivalents) which the Parent is required to file with the Securities and Exchange Commission (or any Governmental Authority substituted therefor). As used in this definition, the term “SEC Off-Balance Sheet Rules” means the Disclosure in Management’s Discussion and Analysis About Off‑Balance Sheet Arrangements, Securities Act Release No. 33-8182, 68 Fed. Reg. 5982 (Feb. 5, 2003) (codified at 17 CFR pts. 228, 229 and 249).

“Other Connection Taxes” means, with respect to any Recipient, Taxes imposed as a result of a present or former connection between such Recipient and the jurisdiction imposing such Tax (other than connections arising from such Recipient having executed, delivered, become a party to, performed its obligations under, received payments under, received or perfected a security interest under, engaged in any

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other transaction pursuant to or enforced any Loan Document, or sold or assigned an interest in any Loan or Loan Document).

“Other Taxes” means all present or future stamp, court or documentary, intangible, recording, filing or similar Taxes that arise from any payment made under, from the execution, delivery, performance, enforcement or registration of, from the receipt or perfection of a security interest under, or otherwise with respect to, any Loan Document, except any such Taxes that are Other Connection Taxes imposed with respect to an assignment.

“Parent” has the meaning set forth in the introductory paragraph hereof and shall include the Parent’s successors and permitted assigns.

“Participant” has the meaning given that term in Section 12.5.(d).

“Participant Register” has the meaning given that term in Section 12.5.(d).

“Patriot Act” means The Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 (Title III of Pub. L. No. 107-56 (signed into law October 26, 2001)).

“PBGC” means the Pension Benefit Guaranty Corporation and any successor agency.

“Permitted Liens” means, as to any Person: (a) Liens securing taxes, assessments and other charges or levies imposed by any Governmental Authority (excluding any Lien imposed pursuant to any of the provisions of ERISA or pursuant to any Environmental Laws) or the claims of materialmen, mechanics, carriers, warehousemen or landlords for labor, materials, supplies or rentals incurred in the ordinary course of business, which are not at the time required to be paid or discharged under Section 7.6.; (b) Liens consisting of deposits or pledges made, in the ordinary course of business, in connection with, or to secure payment of, obligations under workers’ compensation, unemployment insurance or similar Applicable Laws; (c) Liens consisting of encumbrances in the nature of zoning restrictions, easements, and rights or restrictions of record on the use of real property, which do not materially detract from the value of such property or impair the use thereof in the business of such Person; (d) the rights of tenants under leases or subleases not interfering with the ordinary conduct of business of such Person; (e) Liens in favor of the Administrative Agent for its benefit and the benefit of the Lenders; (f) Liens in favor of the Borrower or a Guarantor securing obligations owing by a Subsidiary to the Borrower or a Guarantor, which obligations have been subordinated to the obligations owing by the Borrower and the Guarantors under the Loan Documents on terms satisfactory to the Administrative Agent; and (g) Liens in existence as of the Agreement Date and set forth in Part II of Schedule 6.1.(f).

“Person” means an individual, corporation, partnership, limited liability company, association, trust or unincorporated organization, or a government or any agency or political subdivision thereof.

“Plan” means at any time an employee pension benefit plan (other than a Multiemployer Plan) which is covered by Title IV of ERISA or subject to the minimum funding standards under Section 412 of the Internal Revenue Code and either (a) is maintained, or contributed to, by any member of the ERISA Group for employees of any member of the ERISA Group or (b) has at any time within the preceding five years been maintained, or contributed to, by any Person which was at such time a member of the ERISA Group for employees of any Person which was at such time a member of the ERISA Group.

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“Post‑Default Rate” means a rate per annum equal to the Alternate Base Rate as in effect from time to time plus the Applicable Margin for Base Rate Loans plustwo percent (2.0%).

“Preferred Dividends” means, for any period and without duplication, all Restricted Payments paid during such period on Preferred Securities issued by the Parent or a Subsidiary. Preferred Dividends shall not include dividends or distributions paid or payable (a) solely in Equity Interests payable to holders of such class of Equity Interests; (b) to the Parent or a Subsidiary; or (c) constituting or resulting in the redemption of Preferred Securities, other than scheduled redemptions not constituting balloon, bullet or similar redemptions in full.

“Preferred Securities” means, with respect to any Person, Equity Interests in such Person which are entitled to preference or priority over any other Equity Interest in such Person in respect of the payment of dividends or distribution of assets upon liquidation or both.

“Prime Rate” means the rate of interest per annum announced publicly by the Lender then acting as the Administrative Agent as its prime rate from time to time. The Prime Rate is not necessarily the best or the lowest rate of interest offered by the Lender acting as the Administrative Agent or any other Lender.

“Principal Office” means the office of the Administrative Agent located at 1680 Capital One Drive, 10th Floor, McLean, Virginia 22102, or such other office of the Administrative Agent as the Administrative Agent may designate from time to time.

“Property” means any parcel of real property owned or leased (in whole or in part) or operated by the Parent, the Borrower, any Subsidiary or any Unconsolidated Affiliate of the Parent.

“Pro Rata Share” means, as to each Lender, the ratio, expressed as a percentage of (a)(i) the amount of such Lender’s Commitment plus (ii) the aggregate outstanding principal amount of such Lender’s Term Loans, if any, to (b)(i) the aggregate amount of the Commitments of all Lenders plus (ii) the aggregate amount of all outstanding Term Loans; provided, however, that if at the time of determination the Commitments have terminated or been reduced to zero, the “Pro Rata Share” of each Lender shall be the ratio, expressed as a percentage of (A) the sum of the unpaid principal amount of all outstanding Loans owing to such Lender as of such date to (B) the sum of the aggregate unpaid principal amount of all outstanding Loans of all Lenders as of such date. If at the time of determination the Commitments have been terminated and there are no outstanding Loans, then the Pro Rata Shares of the Lenders shall be determined as of the most recent date on which any Loans were outstanding.

“Qualified Plan” means a Benefit Arrangement that is intended to be tax-qualified under Section 401(a) of the Internal Revenue Code.

“Rating Agency” means S&P, Moody’s or Fitch.

“Recipient” means (a) the Administrative Agent, or (b) any Lender, as applicable.

“Recourse Indebtedness” means any Indebtedness other than Nonrecourse Indebtedness.

“Register” has the meaning given that term in Section 12.5.(c).

“Regulatory Change” means, with respect to any Lender, any change effective after the Agreement Date in Applicable Law (including without limitation, Regulation D of the Board of Governors of the Federal

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Reserve System) or the adoption or making after such date of any interpretation, directive or request applying to a class of banks, including such Lender, of or under any Applicable Law (whether or not having the force of law and whether or not failure to comply therewith would be unlawful) by any Governmental Authority or monetary authority charged with the interpretation or administration thereof or compliance by any Lender with any request or directive regarding capital adequacy or liquidity. Notwithstanding anything herein to the contrary, (a) the Dodd-Frank Wall Street Reform and Consumer Protection Act and all requests, rules, guidelines or directives thereunder or issued in connection therewith and (b) all requests, rules, guidelines or directives promulgated by the Bank for International Settlements, the Basel Committee on Banking Supervision (or any successor or similar authority) or the United States or foreign regulatory authorities, in each case pursuant to Basel III, shall in each case be deemed to be a “Regulatory Change”, regardless of the date enacted, adopted or issued.

“REIT” means a Person qualifying for treatment as a “real estate investment trust” under the Internal Revenue Code.

“Related Parties” means, with respect to any Person, such Person’s Affiliates and the partners, directors, officers, employees, agents and advisors of such Person and of such Person’s Affiliates.

“Requisite Lenders” means, as of any date, (a) Lenders having more than 50% of the aggregate amount of the Commitments and the principal amount of the aggregate outstanding Loans, or (b) if the Commitments have been terminated or reduced to zero, Lenders holding more than 50% of the principal amount of the aggregate outstanding Loans; provided that in determining such percentage at any given time, all then existing Defaulting Lenders will be disregarded and excluded.

“Responsible Officer” means with respect to the Parent or any Subsidiary, the chief executive officer, the chief operating officer, the chief financial officer, or president of the Parent or such Subsidiary.

“Restricted Payment” means: (a) any dividend or other distribution, direct or indirect, on account of any Equity Interest of the Parent or any Subsidiary now or hereafter outstanding, except a dividend payable solely in Equity Interests of identical class to the holders of that class; (b) any redemption, conversion, exchange, retirement, sinking fund or similar payment, purchase or other acquisition for value, direct or indirect, of any Equity Interest of the Parent or any Subsidiary now or hereafter outstanding; and (c) any payment made to retire, or to obtain the surrender of, any outstanding warrants, options or other rights to acquire any Equity Interests of the Parent or any Subsidiary now or hereafter outstanding.

“Sanctioned Country” means, at any time, a country or territory which is, or whose government is, the subject or target of any Sanctions.

“Sanctioned Person” means, at any time, (a) any Person listed in any Sanctions-related list of designated Persons maintained by any Governmental Authority of the United States of America, including without limitation, OFAC or the U.S. Department of State, or by the United Nations Security Council, the European Union or any other Governmental Authority, (b) any Person located, operating, organized or resident in a Sanctioned Country, (c) an agency, political subdivision or instrumentality of the government of a Sanctioned County or (d) any Person Controlled by any Person or agency described in any of the preceding clauses (a) through (c).

“Sanctions” means any sanctions or trade embargoes imposed, administered or enforced by any Governmental Authority of the United States of America, including without limitation, OFAC or the U.S.

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Department of State, or by the United Nations Security Council, the European Union or any other Governmental Authority.

“Secured Indebtedness” means, with respect to a Person as of any given date, the aggregate principal amount of all Indebtedness of such Person outstanding at such date and that is secured in any manner by any Lien, and in the case of the Parent or the Borrower, shall include (without duplication) the Parent’s or the Borrower’s, respectively, pro rata share of the Secured Indebtedness of its Unconsolidated Affiliates.

“Securities Act” means the Securities Act of 1933, as amended from time to time, together with all rules and regulations issued thereunder.

“Solvent” means, when used with respect to any Person, that (a) the fair value and the fair salable value of its assets (excluding any Indebtedness due from any Affiliate of such Person) are each in excess of the fair valuation of its total liabilities (including all contingent liabilities computed at the amount which, in light of all the facts and circumstances existing at such time, represents the amount that could reasonably be expected to become an actual and matured liability); (b) such Person is able to pay its debts or other obligations in the ordinary course as they mature; and (c) such Person has capital not unreasonably small to carry on its business and all business in which it proposes to be engaged.

“Stabilized Property” means, any Property that is not a Development Property.

“S&P” means Standard & Poor’s Ratings Services, a Standard & Poor’s Financial Services LLC business, or any successor.

“Subsidiary” means, for any Person, any corporation, partnership or other entity of which at least a majority of the securities or other ownership interests having by the terms thereof ordinary voting power to elect a majority of the board of directors or other persons performing similar functions of such corporation, partnership or other entity (without regard to the occurrence of any contingency) is at the time directly or indirectly owned or controlled by such Person or one or more Subsidiaries of such Person or by such Person and one or more Subsidiaries of such Person, and shall include all Persons the accounts of which are consolidated with those of such Person pursuant to GAAP.

“Tangible Net Worth” means, as of any date of determination, the stockholders’ equity of the Parent and its Subsidiaries determined on a consolidated basis plus (a) accumulated depreciation and amortization minus the following (to the extent reflected in determining stockholders’ equity of the Parent and its Subsidiaries); (b) the amount of any write-up in the book value of any assets contained in any balance sheet resulting from revaluation thereof or any write‑up in excess of the cost of such assets acquired; and (c) all amounts appearing on the assets side of any such balance sheet for assets which would be classified as intangible assets under GAAP excluding such intangibles booked in connection with real estate acquisitions with above or below market rents, all determined on a consolidated basis.

“Taxes” means all present or future taxes, levies, imposts, duties, deductions, withholdings (including backup withholding), assessments, fees or other charges imposed by any Governmental Authority, including any interest, additions to tax or penalties applicable thereto.

“Term Loan” means a loan made by a Lender to the Borrower pursuant to the terms of Section 2.1.(a) or an Additional Term Loan.

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“Term Loan Commitment” means, as to each Lender, such Lender’s obligation to make Term Loans pursuant to Section 2.1., in an amount up to, but not exceeding, the amount set forth for such Lender on Schedule I as such Lender’s “Commitment” or as set forth in the applicable Assignment and Acceptance or agreement executed by a Person becoming a Lender pursuant to Section 2.9., or increased or reduced as appropriate to reflect any assignments to or by such Lender effected in accordance with Section 12.5. or increased as appropriate to reflect any increase effected in accordance with Section 2.9.

“Term Note” means a promissory note of the Borrower substantially in the form of Exhibit E payable to the order of a Lender in a principal amount equal to the initial principal amount of such Lender’s Commitment.

“Titled Agents” means each of the Joint Lead Arrangers, each Syndication Agent and their respective successors and permitted assigns.

“Total Asset Value” means the sum of all of the following of the Parent and its Subsidiaries on a consolidated basis, without duplication, determined in accordance with GAAP applied on a consistent basis: (a) cash and Cash Equivalents (other than cash and Cash Equivalents that are subject to a Lien or a Negative Pledge or the disposition of which is restricted) and Marketable Securities, plus (b) with respect to each Stabilized Property owned by the Parent, the Borrower or any Subsidiary of the Borrower or the Parent, (i)(A) Net Operating Income attributable to such Stabilized Property for the fiscal quarter most recently ended multiplied by 4, divided by (ii) the Capitalization Rate, plus (c) the GAAP book value of all Properties owned or leased entirely by the Parent, the Borrower or a Wholly Owned Subsidiary and the pro-rata share of the Parent or the Borrower, as applicable, of the GAAP book value of all other Properties owned or leased by any Subsidiary that is not a Wholly Owned Subsidiary, in each case, acquired during the four consecutive fiscal quarters most recently ended, plus (d) the GAAP book value of all Development Properties (including Construction‑in‑Process), plus (e) the GAAP book value of Unimproved Land, Mortgage Receivables and other promissory notes, plus (f) the GAAP book value at undepreciated cost net of any impairments of all Stabilized Properties with negative Net Operating Income; provided, that no such Property described in this clause (f) shall be included for longer than a period of 24 months and to the extent that Total Asset Value attributable to such Properties described in this clause (f) exceeds 5.0% of Total Asset Value, such excess shall be excluded from Total Asset Value. The Parent’s pro rata share of assets held by Unconsolidated Affiliates will be included in Total Asset Value calculations consistent with the above described treatment for wholly owned assets. For purposes of determining Total Asset Value, Net Operating Income from (A) Properties acquired during the four consecutive fiscal quarters most recently ended, (B) Properties disposed of by the Parent, its Subsidiaries and Unconsolidated Affiliates during the immediately preceding fiscal quarter and (C) Properties with negative Net Operating Income shall be excluded from clause (b) above.

“Total Indebtedness” means all Indebtedness of the Parent and its Subsidiaries determined on a consolidated basis.

“Type” with respect to a Loan, refers to whether such Loan is a LIBOR Loan or Base Rate Loan.

“Unconsolidated Affiliate” means, with respect to any Person, any other Person in whom such Person holds an Investment, which Investment is accounted for in the financial statements of such Person on an equity basis of accounting and whose financial results would not be consolidated under GAAP with the financial results of such Person on the consolidated financial statements of such Person.

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“Unencumbered Adjusted NOI”means, for any period of determination, Adjusted Net Operating Income from Wholly Owned Properties and the pro-rata share of Adjusted Net Operating Income from Controlled Properties as adjusted for any non-recurring items during the reporting period.

“Unencumbered Asset Value” means, without duplication, (a) (i) the Unencumbered NOI (excluding Net Operating Income attributable to Development Properties, Properties with negative Net Operating Incomes, Properties acquired during the four consecutive fiscal quarters most recently ending and Properties disposed of during the fiscal quarter most recently ending) for the fiscal quarter most recently ending times four divided by (ii) the Capitalization Rate, plus (b) the GAAP book value of all Wholly Owned Properties and the pro-rata share of the Parent or the Borrower, as applicable, of the GAAP book value of Controlled Properties, in each case, acquired during the four consecutive fiscal quarters most recently ended, plus (c) the GAAP book value of all Development Properties (including the Construction-in-Process) and Unimproved Land, in each case that are Wholly Owned Properties, and the pro-rata share of the Parent or the Borrower, as applicable, of the GAAP book value of all Development Properties (including the Construction-in-Process) and Unimproved Land, in each case that are Controlled Properties, plus (d) the GAAP book value at undepreciated cost net of any impairments of all Stabilized Properties that constitute Wholly Owned Properties with negative Net Operating Income and the pro-rata share of the Parent or the Borrower, as applicable, of GAAP book value at undepreciated cost net of any impairments of all Stabilized Properties that constitute Controlled Properties; provided, that no such Property described in this clause (d) shall be included for longer than a period of 24 months and to the extent that Unencumbered Asset Value attributable to such Properties described in this clause (d) exceeds 5.0% of Unencumbered Asset Value, such excess shall be excluded from Unencumbered Asset Value. For purposes of this definition, (x) to the extent the Unencumbered Asset Value attributable to Development Properties and Unimproved Land would exceed 35% of the Unencumbered Asset Value, such excess shall be excluded, (y) to the extent the Unencumbered Asset Value attributable to Unimproved Land would exceed 15% of the Unencumbered Asset Value, such excess shall be excluded and (z) to the extent the Unencumbered Asset Value attributable to Controlled Properties would exceed 15% of the Unencumbered Asset Value, such excess shall be excluded.

“Unencumbered NOI” means, for any period of determination, Net Operating Income from Wholly Owned Properties and the pro-rata share of Net Operating Income from Controlled Properties which have been owned for the entire fiscal quarter most recently ended as adjusted for any non-recurring items during the reporting period.

“Unfunded Liabilities” means, with respect to any Plan at any time, the amount (if any) by which (a) the value of all benefit liabilities under such Plan, determined on a plan termination basis using the assumptions prescribed by the PBGC for purposes of Section 4044 of ERISA, exceeds (b) the fair market value of all Plan assets allocable to such liabilities under Title IV of ERISA (excluding any accrued but unpaid contributions), all determined as of the then most recent valuation date for such Plan, but only to the extent that such excess represents a potential liability of a member of the ERISA Group to the PBGC or any other Person under Title IV of ERISA.

“Unimproved Land” means land with respect to which no development (other than improvements that are not material and are temporary in nature) has occurred and for which no development is planned in the 12 months following the date of determination.

“Unsecured Indebtedness” means Indebtedness which is not Secured Indebtedness.

“Unsecured Interest Expense” means, for any period of determination, Interest Expense for such period attributable to Unsecured Indebtedness of the Parent and its Subsidiaries.

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“U.S. Person” means any Person that is a “United States Person” as defined in Section 7701(a)(30) of the Internal Revenue Code.

“U.S. Tax Compliance Certificate” has the meaning assigned to such term in Section 3.12.(g)(ii)(B)(III).

“Wholly Owned Property” means an Eligible Unencumbered Property which is owned or leased entirely by the Parent, the Borrower or a Wholly Owned Subsidiary.

“Wholly Owned Subsidiary” means any Subsidiary of a Person in respect of which all of the equity securities or other ownership interests (other than, in the case of a corporation, directors’ qualifying shares) are at the time directly or indirectly owned or controlled by such Person or one or more other Subsidiaries of such Person or by such Person and one or more other Subsidiaries of such Person.

“Withholding Agent” means (a) the Borrower, (b) any other Loan Party and (c) the Administrative Agent, as applicable.

Section 1.2. General; References to Times.

Unless otherwise indicated, all accounting terms, ratios and measurements shall be interpreted or determined in accordance with GAAP; provided that, if at any time any change in GAAP would affect the computation of any financial ratio or requirement set forth in any Loan Document, and either the Borrower or the Requisite Lenders shall so request, the Administrative Agent, the Lenders and the Borrower shall negotiate in good faith to amend such ratio or requirement to preserve the original intent thereof in light of such change in GAAP (subject to the approval of the Requisite Lenders); provided further that, until so amended, (i) such ratio or requirement shall continue to be computed in accordance with GAAP prior to such change therein and (ii) the Parent shall provide to the Administrative Agent and the Lenders financial statements and other documents required under this Agreement or as reasonably requested hereunder setting forth a reconciliation between calculations of such ratio or requirement made before and after giving effect to such change in GAAP. Notwithstanding the preceding sentence, the calculation of liabilities shall not include any fair value adjustments to the carrying value of liabilities to record such liabilities at fair value pursuant to electing the fair value option election under FASB ASC 825-10-25 (formerly known as FAS 159, The Fair Value Option for Financial Assets and Financial Liabilities) or other FASB standards allowing entities to elect fair value option for financial liabilities. Accordingly, the amount of liabilities shall be the historical cost basis, which generally is the contractual amount owed adjusted for amortization or accretion of any premium or discount. References in this Agreement to “Sections”, “Articles”, “Exhibits” and “Schedules” are to sections, articles, exhibits and schedules herein and hereto unless otherwise indicated. References in this Agreement to any document, instrument or agreement (a) shall include all exhibits, schedules and other attachments thereto, (b) shall include all documents, instruments or agreements issued or executed in replacement thereof, to the extent permitted hereby and (c) shall mean such document, instrument or agreement, or replacement or predecessor thereto, as amended, supplemented, restated or otherwise modified as of the date of this Agreement and from time to time thereafter to the extent not prohibited hereby and in effect at any given time. Wherever from the context it appears appropriate, each term stated in either the singular or plural shall include the singular and plural, and pronouns stated in the masculine, feminine or neuter gender shall include the masculine, the feminine and the neuter. Unless explicitly set forth to the contrary, a reference to “Subsidiary” means a Subsidiary of the Parent or a Subsidiary of such Subsidiary, a reference to an “Affiliate” means a reference to an Affiliate of the Parent and a reference to an “Unconsolidated Affiliate” means a reference to an Unconsolidated Affiliate of the Parent. Titles and

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captions of Articles, Sections, subsections and clauses in this Agreement are for convenience only, and neither limit nor amplify the provisions of this Agreement. Unless otherwise indicated, all references to time are references to Eastern time.

Section 1.3. Financial Attributes of Non-Wholly Owned Subsidiaries.

When determining the Parent’s or the Borrower’s compliance with any financial covenant contained in any of the Loan Documents, only the Parent’s or the Borrower’s, respectively, pro rata share of the financial attributes of a Subsidiary that is not a Wholly Owned Subsidiary (other than the Borrower) shall be included.

ARTICLE II. CREDIT FACILITY

Section 2.1. Loans.

(a)    Making of Term Loans. Subject to the terms and conditions of this Agreement, each Lender severally and not jointly agrees to make Term Loans to the Borrower during the Availability Period, in an aggregate principal amount up to, but not exceeding, such Lender’s Commitment. There shall be no more than 3 separate borrowings of Term Loans and each borrowing of Term Loans shall be in an aggregate minimum amount of $25,000,000 and integral multiples of $25,000,000 in excess thereof; provided, that a borrowing of Term Loans may be in the aggregate amount of the remaining Commitments. Upon a Lender’s funding of a Term Loan, such Lender’s Commitment shall be permanently reduced by the principal amount of such Term Loan. All Commitments shall terminate on the Availability Termination Date if not previously terminated pursuant to this Agreement. Once repaid, the principal amount of a Term Loan (or portion thereof) may not be reborrowed.

(b)    Requests for Term Loans.

(i)    Not later than 11:00 a.m. at least one (1) Business Day in the case of a borrowing of Term Loans that are to be Base Rate Loans and not later than 11:00 a.m. at least three (3) Business Days in the case of a borrowing of Term Loans that are to be LIBOR Loans, in each case, prior to the anticipated date of borrowing, the Borrower shall deliver to the Administrative Agent a Notice of Borrowing. Each Notice of Borrowing shall specify the aggregate principal amount of such Term Loans to be borrowed, the Type of such Term Loans, the date such Term Loans are to be borrowed (which must be a Business Day) and if any such Term Loans are to be LIBOR Loans, the initial Interest Period for such Term Loans.

(ii)    The Notice of Borrowing shall be irrevocable once given and binding on the Borrower. Prior to delivering a Notice of Borrowing, the Borrower may (without specifying whether a Term Loan will be a Base Rate Loan or a LIBOR Loan) request that the Administrative Agent provide the Borrower with the most recent LIBOR available to the Administrative Agent. The Administrative Agent shall provide such quoted rate to the Borrower on the date of such request or as soon as possible thereafter.

(c)    Funding of Term Loans. Promptly after receipt of a Notice of Borrowing,the Administrative Agent shall notify each Lender of the proposed borrowing. Each Lender shall deposit an amount equal to the requested Term Loan to be made by such Lender to the Borrower with the Administrative Agent at the Principal Office, in immediately available funds not later than 1:00 p.m. on the date of such proposed Term Loans. Subject to fulfillment of all applicable conditions set forth herein, the Administrative Agent shall make available to the Borrower in the account specified in the Notice of Borrowing, not later than 2:00 p.m.

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on the date of the requested borrowing of Term Loans, the proceeds of such amounts received by the Administrative Agent. The Borrower may not reborrow any portion of the Term Loans once repaid.

(d)    Assumptions Regarding Funding by Lenders. With respect to Term Loans to be made after the Effective Date, unless the Administrative Agent shall have been notified by any Lender that such Lender will not make available to the Administrative Agent a Term Loan to be made by such Lender in connection with any borrowing, the Administrative Agent may assume that such Lender will make the proceeds of such Term Loan available to the Administrative Agent in accordance with Section 2.1., and the Administrative Agent may (but shall not be obligated to), in reliance upon such assumption, make available to the Borrower the amount of such Term Loan to be provided by such Lender. In such event, if such Lender does not make available to the Administrative Agent the proceeds of such Term Loan, then such Lender and the Borrower severally agree to pay to the Administrative Agent on demand the amount of such Term Loan with interest thereon, for each day from and including the date such Term Loan is made available to the Borrower but excluding the date of payment to the Administrative Agent, at (i) in the case of a payment to be made by such Lender, the greater of the Federal Funds Rate and a rate determined by the Administrative Agent in accordance with banking industry rules on interbank compensation and (ii) in the case of a payment to be made by the Borrower, the interest rate applicable to such Term Loans. If the Borrower and such Lender shall pay the amount of such interest to the Administrative Agent for the same or overlapping period, the Administrative Agent shall promptly remit to the Borrower the amount of such interest paid by the Borrower for such period. If such Lender pays to the Administrative Agent the amount of such Term Loan, the amount so paid shall constitute such Lender’s Term Loan included in the borrowing. Any payment by the Borrower shall be without prejudice to any claim the Borrower may have against a Lender that shall have failed to make available the proceeds of a Term Loan to be made by such Lender.

Section 2.2. Rates and Payment of Interest on Loans.

(a)    Rates. The Borrower promises to pay to the Administrative Agent for the account of each Lender interest on the unpaid principal amount of each Loan made by such Lender for the period from and including the date of the making of such Loan to but excluding the date such Loan shall be paid in full, at the following per annum rates:

(i) during such periods as such Loan is a Base Rate Loan, at the Alternate Base Rate (as in effect from time to time), plus the Applicable Margin for Base Rate Loans; and

(ii)    during such periods as such Loan is a LIBOR Loan, at Adjusted LIBOR for such Loan for the Interest Period therefor, plus the Applicable Margin for LIBOR Loans.

Notwithstanding the foregoing, during the continuance of an Event of Default, the Borrower shall pay to the Administrative Agent for the account of each Lender interest at the Post-Default Rate on the outstanding principal amount of the Loans made by such Lender, and on any other amount payable by the Borrower hereunder or under the Notes held by such Lenders to or for the account of such Lenders (including without limitation, accrued but unpaid interest to the extent permitted under Applicable Law).

(b)    Payment of Interest. Accrued and unpaid interest on each Loan shall be payable (i) in the case of a Base Rate Loan, monthly in arrears on the first day of each calendar month, (ii) in the case of a LIBOR Loan, in arrears on the last day of each Interest Period therefor, and, if such Interest Period is longer than three months, at three-month intervals following the first day of such Interest Period, and (iii) in the case of any Loan, in arrears upon the payment, prepayment or Continuation thereof or the Conversion of

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such Loan to a Loan of another Type (but only on the principal amount so paid, prepaid, Continued or Converted). Interest payable at the Post-Default Rate shall be payable from time to time on demand. Promptly after the determination of any interest rate provided for herein or any change therein, the Administrative Agent shall give notice thereof to the Lenders to which such interest is payable and to the Borrower. All determinations by the Administrative Agent of an interest rate hereunder shall be conclusive and binding on the Lenders and the Borrower for all purposes, absent manifest error.

Section 2.3. Number of Interest Periods.

There may be no more than 8 different Interest Periods for Loans that are LIBOR Loans outstanding at the same time.

Section 2.4. Repayment of Loans.

The Borrower shall repay the entire outstanding principal amount of, and all accrued but unpaid interest on, the Loans on the Maturity Date.

Section 2.5. Prepayments.

(a)    Optional. Subject to the immediately succeeding subsection (b) and Section 4.4., the Borrower may prepay any Loan at any time without premium or penalty. The Borrower shall give the Administrative Agent at least one Business Day’s prior written notice of the prepayment of any Loan.

(b)     Prepayment Fee. During the periods set forth below, the Borrower may only prepay the Loans, in whole or in part, at the prices (expressed as percentages of the principal amount of the Loan (or portion thereof) to be prepaid) set forth below, plus accrued and unpaid interest, if any, to the date of prepayment:

Period	Percentage
Effective Date to and including December 17, 2016	102.0%
December 18, 2016 to and including December 17, 2017	101.0%
All times after December 17, 2017	100.0%

The Borrower acknowledges and agrees that the amounts payable by it under this subsection in connection with the prepayment of the Loans are reasonable calculations of the lost profits of the Lenders in view of the difficulties and impracticality of determining actual damages resulting from the prepayment of the Loans.

Section 2.6. Continuation.

So long as no Event of Default shall exist, the Borrower may on any Business Day, with respect to any LIBOR Loan, elect to maintain such LIBOR Loan or any portion thereof as a LIBOR Loan by selecting a new Interest Period for such LIBOR Loan. Each new Interest Period selected under this Section shall commence on the last day of the immediately preceding Interest Period. Each selection of a new Interest Period shall be made by the Borrower giving to the Administrative Agent a Notice of Continuation not later than 11:00 a.m. on the third Business Day prior to the date of any such Continuation. Such notice by the Borrower of a Continuation shall be by telephone, electronic mail or telecopy, confirmed immediately in writing if by telephone, in the form of a Notice of Continuation, specifying (a) the proposed date of such Continuation, (b) the LIBOR Loans and portions thereof subject to such Continuation and (c) the duration

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of the selected Interest Period, all of which shall be specified in such manner as is necessary to comply with all limitations on Loans outstanding hereunder. Each Notice of Continuation shall be irrevocable by and binding on the Borrower once given. Promptly after receipt of a Notice of Continuation, the Administrative Agent shall notify each Lender holding Loans being Continued by telecopy, or other similar form of transmission, of the proposed Continuation. If the Borrower shall fail to select in a timely manner a new Interest Period for any LIBOR Loan in accordance with this Section, or if an Event of Default shall exist, such Loan will automatically, on the last day of the current Interest Period therefor, Convert into a Base Rate Loan notwithstanding the first sentence of Section 2.7. or the Borrower’s failure to comply with any of the terms of such Section.

Section 2.7. Conversion.

The Borrower may on any Business Day, upon the Borrower’s giving of a Notice of Conversion to the Administrative Agent, Convert all or a portion of a Loan of one Type into a Loan of another Type; provided, however, a Base Rate Loan may not be Converted to a LIBOR Loan if an Event of Default shall exist. Any Conversion of a LIBOR Loan into a Base Rate Loan shall be made on, and only on, the last day of an Interest Period for such LIBOR Loan and, upon Conversion of a Base Rate Loan into a LIBOR Loan, the Borrower shall pay accrued interest to the date of Conversion on the principal amount so Converted. Each such Notice of Conversion shall be given not later than 11:00 a.m. on the Business Day prior to the date of any proposed Conversion into Base Rate Loans and on the third Business Day prior to the date of any proposed Conversion into LIBOR Loans. Promptly after receipt of a Notice of Conversion, the Administrative Agent shall notify each Lender holding Loans being Converted by telecopy, or other similar form of transmission, of the proposed Conversion. Subject to the restrictions specified above, each Notice of Conversion shall be by telephone (confirmed immediately in writing), electronic mail or telecopy in the form of a Notice of Conversion specifying (a) the requested date of such Conversion, (b) the Type of Loan to be Converted, (c) the portion of such Type of Loan to be Converted, (d) the Type of Loan such Loan is to be Converted into and (e) if such Conversion is into a LIBOR Loan, the requested duration of the Interest Period of such Loan. Each Notice of Conversion shall be irrevocable by and binding on the Borrower once given.

Section 2.8. Notes.

(a)    Notes. If requested by any Lender, the Loans made by such Lender shall, in addition to this Agreement, also be evidenced by a Note payable to the order of such Lender in a principal amount equal to the initial principal amount of its Commitment, and, in each case, otherwise duly completed.

(b)    Records. The date, amount, interest rate, Type and duration of Interest Periods (if applicable) of each Loan made by each Lender to the Borrower, and each payment made on account of the principal thereof, shall be recorded by such Lender on its books and such entries shall be binding on the Borrower, absent manifest error; provided, however, that (i) the failure of a Lender to make any such record shall not affect the obligations of the Borrower under any of the Loan Documents and (ii) if there is a discrepancy between such records and the statement of accounts maintained by the Administrative Agent pursuant to Section 3.10., in the absence of manifest error, the statements of account maintained by the Administrative Agent pursuant to Section 3.10. shall be controlling.

(c)    Lost, Stolen, Destroyed or Mutilated Notes. Upon receipt by the Borrower of (i) written notice from a Lender that a Note of such Lender has been lost, stolen, destroyed or mutilated, and (ii) (A) in the case of loss, theft or destruction, an unsecured agreement of indemnity from such Lender in form reasonably satisfactory to the Borrower, or (B) in the case of mutilation, upon surrender and cancellation of

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such Note, the Borrower shall at its own expense execute and deliver to such Lender a new Note dated the date of such lost, stolen, destroyed or mutilated Note.

Section 2.9. Additional Term Loans.

With the prior consent of the Administrative Agent, such consent not to be unreasonably withheld, conditioned or delayed, the Borrower shall have the right at any time and from time to time during the period from the Availability Termination Date to but excluding the Maturity Date, to request the making of additional Term Loans (the “Additional Term Loans”) (provided, that after giving effect to the making of Additional Term Loans, the aggregate outstanding principal amount of Term Loans may not exceed $400,000,000 less the amount of any voluntary prepayments of Term Loans) by providing written notice to the Administrative Agent, which notice shall be irrevocable once given and shall be forwarded by the Agent to each Lender; provided, however, the Borrower shall not have the right to make more than 4 requests for Additional Term Loans during the term of this Agreement. Each such borrowing of Additional Term Loans must be in an aggregate minimum amount of $5,000,000 and integral multiples of $5,000,000 in excess thereof. The Joint Lead Arrangers, in consultation with the Borrower, shall manage all aspects of the syndication of such Additional Term Loans, including decisions, which shall be subject to the approval of the Borrower, as to the selection of the existing Lenders and/or other banks, financial institutions and other institutional lenders to be approached with respect to any such Additional Term Loans and the allocations of any such Additional Term Loans among such existing Lenders and/or other banks, financial institutions and other institutional lenders. No Lender shall be obligated in any way whatsoever to make an Additional Term Loan, and any new Lender becoming a party to this Agreement in connection with any such making of Additional Term Loans must be an Eligible Assignee. The making of Additional Term Loans under this Section is subject to the following conditions precedent: (x) no Default or Event of Default shall be in existence on the effective date of such making of Additional Term Loans, (y) the representations and warranties made or deemed made by the Borrower or any other Loan Party in any Loan Document to which such Loan Party is a party shall be true and correct in all material respects (except in the case of a representation or warranty qualified by materiality, in which case such representation or warranty shall be true and correct in all respects) on the effective date of such making of Additional Term Loans except to the extent that such representations and warranties expressly relate solely to an earlier date (in which case such representations and warranties shall have been true and correct in all material respects (except in the case of a representation or warranty qualified by materiality, in which case such representation or warranty shall have been true and correct in all respects) on and as of such earlier date) and except for changes in factual circumstances not prohibited hereunder, and (z) the Administrative Agent shall have received each of the following, in form and substance satisfactory to the Administrative Agent: (i) if not previously delivered to the Administrative Agent, copies certified by the Secretary or Assistant Secretary of (A) all partnership or other necessary action taken by the Borrower to authorize such Additional Term Loans and (B) all corporate, partnership, member or other necessary action taken by each Guarantor authorizing the guaranty of such Additional Term Loans; (ii) if requested by the Administrative Agent, an opinion of counsel to the Borrower and the Guarantors, and addressed to the Administrative Agent and the Lenders covering such matters as reasonably requested by the Administrative Agent, and (iii) in the case of a Lender that has notified the Administrative Agent in writing that it wants to receive Notes, a new Term Note executed by the Borrower, payable to such new Lenders, and replacement Term Notes executed by the Borrower payable to such existing Lenders making such Additional Term Loans in the aggregate outstanding principal amount of such Lender’s Term Loan at the time of the making of such Additional Term Loans. In connection with the making of Additional Term Loans pursuant to this Section 2.9., any Lender becoming a party hereto shall (1) execute such documents and agreements as the Administrative Agent may reasonably request and (2) in the case of any Lender that is organized under the laws of a jurisdiction outside of the United States of America, provide to the Administrative Agent, its name, address, tax identification number and/or such other information as shall be necessary for the Administrative

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Agent to comply with “know your customer” and anti-money laundering rules and regulations, including without limitation, the Patriot Act.

ARTICLE III. PAYMENTS, FEES AND OTHER GENERAL PROVISIONS

Section 3.1. Payments.

Except to the extent otherwise provided herein, all payments of principal, interest and other amounts to be made by the Borrower under this Agreement or any other Loan Document shall be made in Dollars, in immediately available funds, without deduction, set‑off or counterclaim (excluding Taxes required to be withheld pursuant to Section 3.12.), to the Administrative Agent at its Principal Office, not later than 2:00 p.m. on the date on which such payment shall become due (each such payment made after such time on such due date to be deemed to have been made on the next succeeding Business Day). Subject to Section 10.4., the Borrower may, at the time of making each payment under this Agreement or any Note, specify to the Administrative Agent the amounts payable by the Borrower hereunder to which such payment is to be applied. Each payment received by the Administrative Agent for the account of a Lender under this Agreement or any Note shall be paid to such Lender at the applicable Lending Office of such Lender no later than 4:00 p.m. on the date of receipt. If the Administrative Agent fails to pay such amount to a Lender as provided in the previous sentence, the Administrative Agent shall pay interest on such amount until paid at a rate per annum equal to the Federal Funds Rate from time to time in effect. If the due date of any payment under this Agreement or any other Loan Document would otherwise fall on a day which is not a Business Day such date shall be extended to the next succeeding Business Day and interest shall be payable for the period of such extension.

Section 3.2. Pro Rata Treatment.

Except to the extent otherwise provided herein: (a) each borrowing from the Lenders under Section 2.1. shall be made from the Lenders, and each payment of the Fees under Section 3.6.(b) shall be made for the account of the Lenders, in each case, pro rata according to the amounts of their respective Commitments; (b) each payment or prepayment of principal of the Loans shall be made for the account of the Lenders pro rata in accordance with the respective unpaid principal amounts of the Loans held by them; (c) each payment of interest on the Loans shall be made for the account of the Lenders pro rata in accordance with the amounts of interest on such Loans then due and payable; and (d) the Conversion and Continuation of Loans of a particular Type (other than Conversions provided for by Section 4.1.) shall be made pro rata among the Lenders according to the amounts of their respective Loans and the then current Interest Period for each Lender’s portion of each such Loan of such Type shall be coterminous.

Section 3.3. Sharing of Payments, Etc.

If a Lender shall obtain payment of any principal of, or interest on, any Loan made by it to the Borrower under this Agreement or shall obtain payment on any other Obligation owing by the Borrower or any other Loan Party through the exercise of any right of set-off, banker’s lien, counterclaim or similar right or otherwise or through voluntary prepayments directly to a Lender or other payments made by or on behalf of the Borrower or any other Loan Party to a Lender not in accordance with the terms of this Agreement and such payment should be distributed to the Lenders in accordance with Section 3.2. or Section 10.4., as applicable, such Lender shall promptly purchase from the other Lenders participations in (or, if and to the extent specified by such Lender, direct interests in) the Loans made by the other Lenders or other Obligations owed to such other Lenders in such amounts, and make such other adjustments from time to time as shall

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be equitable, to the end that all the Lenders shall share the benefit of such payment (net of any reasonable expenses which may actually be incurred by such Lender in obtaining or preserving such benefit) in accordance with the requirements of Section 3.2. or Section 10.4., as applicable. To such end, all the Lenders shall make appropriate adjustments among themselves (by the resale of participations sold or otherwise) if such payment is rescinded or must otherwise be restored. The Borrower agrees that any Lender so purchasing a participation (or direct interest) in the Loans or other Obligations owed to the other Lenders may exercise all rights of set-off, banker’s lien, counterclaim or similar rights with respect to such participation as fully as if such Lender were a direct holder of Loans in the amount of such participation. Nothing contained herein shall require any Lender to exercise any such right or shall affect the right of any Lender to exercise and retain the benefits of exercising, any such right with respect to any other indebtedness or obligation of the Borrower.

Section 3.4. Several Obligations.

No Lender shall be responsible for the failure of any other Lender to make a Loan or to perform any other obligation to be made or performed by such other Lender hereunder, and the failure of any Lender to make a Loan or to perform any other obligation to be made or performed by it hereunder shall not relieve the obligation of any other Lender to make any Loan or to perform any other obligation to be made or performed by such other Lender.

Section 3.5. Minimum Amounts.

(a)    Borrowings and Conversions. Except as otherwise provided herein, each borrowing of Base Rate Loans shall be in an aggregate minimum amount of $1,000,000 and integral multiples of $100,000 in excess thereof. Except as otherwise provided herein, each borrowing and each Conversion of LIBOR Loans shall be in an aggregate minimum amount of $1,000,000 and integral multiples of $1,000,000 in excess of that amount.

(b)    Prepayments. Each voluntary prepayment of Loans shall be in an aggregate minimum amount of $1,000,000 and integral multiples of $500,000 in excess thereof (or, if less, the aggregate principal amount of Loans then outstanding).

Section 3.6. Fees.

(a)    Closing Fees. On the Effective Date, the Borrower agrees to pay to the Administrative Agent and each Lender all loan fees as have been agreed to in writing by the Parent and the Joint Lead Arrangers.

(b)    Facility Ticking Fees. During the period from the Effective Date to and including the Availability Termination Date, the Borrower agrees to pay to the Administrative Agent for the account of the Lenders a facility ticking fee equal to the sum of the daily amount of the Commitments available multiplied by a per annum rate equal to 0.25%. Such fee shall be computed on a daily basis and payable quarterly in arrears on the first day of each January, April, July and October that occurs during the Availability Period and on the Availability Termination Date.

(c)    Administrative and Other Fees. The Borrower agrees to pay the administrative and other fees of the Administrative Agent as may be agreed to in writing by the Borrower and the Administrative Agent from time to time.

Section 3.7. Computations.

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Unless otherwise expressly set forth herein, any accrued interest on any Loan, any Fees or any other Obligations due hereunder shall be computed on the basis of a year of 360 days and the actual number of days elapsed; provided, however, any accrued interest on any Base Rate Loan shall be computed on the basis of a year of 365 or 366 days, as applicable, and the actual number of days elapsed.

Section 3.8. Usury.

In no event shall the amount of interest due or payable on the Loans or other Obligations exceed the maximum rate of interest allowed by Applicable Law and, if any such payment is paid by the Borrower or any other Loan Party or received by any Lender, then such excess sum shall be credited as a payment of principal, unless the Borrower shall notify the respective Lender in writing that the Borrower elects to have such excess sum returned to it forthwith. It is the express intent of the parties hereto that the Borrower not pay and the Lenders not receive, directly or indirectly, in any manner whatsoever, interest in excess of that which may be lawfully paid by the Borrower under Applicable Law.

Section 3.9. Agreement Regarding Interest and Charges.

The parties hereto hereby agree and stipulate that the only charge imposed upon the Borrower for the use of money in connection with this Agreement is and shall be the interest specifically described in Section 2.2.(a)(i) and (ii). Notwithstanding the foregoing, the parties hereto further agree and stipulate that all agency fees, syndication fees, facility ticking fees, prepayment fees, closing fees, underwriting fees, default charges, late charges, funding or “breakage” charges, increased cost charges, attorneys’ fees and reimbursement for costs and expenses paid by the Administrative Agent or any Lender to third parties or for damages incurred by the Administrative Agent or any Lender, in each case in connection with the transactions contemplated by this Agreement and the other Loan Documents, are charges made to compensate the Administrative Agent or any such Lender for underwriting or administrative services and costs or losses performed or incurred, and to be performed or incurred, by the Administrative Agent and the Lenders in connection with this Agreement and shall under no circumstances be deemed to be charges for the use of money. All charges other than charges for the use of money shall be fully earned and nonrefundable when due.

Section 3.10. Statements of Account.

The Administrative Agent will account to the Borrower monthly with a statement of Loans, accrued interest and Fees, charges and payments made pursuant to this Agreement and the other Loan Documents, and such account rendered by the Administrative Agent shall be deemed conclusive upon Borrower to the extent the Borrower shall fail to object to such account in writing within 5 Business Days of the receipt thereof. The failure of the Administrative Agent to deliver such a statement of accounts shall not relieve or discharge the Borrower from any of its obligations hereunder.

Section 3.11. Defaulting Lenders.

Notwithstanding anything to the contrary contained in this Agreement, if any Lender becomes a Defaulting Lender, then, until such time as such Lender is no longer a Defaulting Lender, to the extent permitted by Applicable Law:

(a)    Waivers and Amendments. Such Defaulting Lender’s right to approve or disapprove any amendment, waiver or consent with respect to this Agreement shall be restricted as set forth in the definition of Requisite Lenders and Section 12.6.

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(b)    Defaulting Lender Waterfall. Any payment of principal, interest, Fees or other amounts received by the Administrative Agent for the account of such Defaulting Lender (whether voluntary or mandatory, at maturity, pursuant to Article X. or otherwise) or received by the Administrative Agent from a Defaulting Lender pursuant to Section 3.3. shall be applied at such time or times as may be determined by the Administrative Agent as follows: first, to the payment of any amounts owing by such Defaulting Lender to the Administrative Agent hereunder; second, as the Borrower may request (so long as no Default or Event of Default exists), to the funding of any Loan in respect of which such Defaulting Lender has failed to fund its portion thereof as required by this Agreement, as determined by the Administrative Agent; third, if so determined by the Administrative Agent and the Borrower, to be held in a deposit account and released pro rata in order to satisfy such Defaulting Lender’s potential future funding obligations with respect to Loans under this Agreement; fourth, to the payment of any amounts owing to the Lenders or the Administrative Agent as a result of any judgment of a court of competent jurisdiction obtained by any Lender or the Administrative Agent against such Defaulting Lender as a result of such Defaulting Lender’s breach of its obligations under this Agreement; fifth, so long as no Default or Event of Default exists, to the payment of any amounts owing to the Borrower as a result of any judgment of a court of competent jurisdiction obtained by the Borrower against such Defaulting Lender as a result of such Defaulting Lender’s breach of its obligations under this Agreement; and sixth, to such Defaulting Lender or as otherwise directed by a court of competent jurisdiction; providedthat if (x) such payment is a payment of the principal amount of any Loans, in respect of which such Defaulting Lender has not fully funded its appropriate share, and (y) such Loans were made at a time when the conditions set forth in Article V. were satisfied or waived, such payment shall be applied solely to pay the Loans of all Non-Defaulting Lenders on a pro rata basis prior to being applied to the payment of any Loans of such Defaulting Lender until such time as all Loans are held by the Lenders pro rata as if there had been no Defaulting Lenders. Any payments, prepayments or other amounts paid or payable to a Defaulting Lender that are applied (or held) to pay amounts owed by a Defaulting Lender or to post cash collateral pursuant to this subsection shall be deemed paid to and redirected by such Defaulting Lender, and each Lender irrevocably consents hereto.

(c)    Certain Fees. No Defaulting Lender shall be entitled to receive any Fee payable under Sections 3.6.(b) for any period during which that Lender is a Defaulting Lender (and the Borrower shall not be required to pay any such fee that otherwise would have been required to have been paid to that Defaulting Lender).

(d)    Defaulting Lender Cure. If the Borrower and the Administrative Agent agree in writing that a Lender is no longer a Defaulting Lender, the Administrative Agent will so notify the parties hereto, whereupon as of the effective date specified in such notice and subject to any conditions set forth therein, that Lender will, to the extent applicable, purchase at par that portion of outstanding Loans of the other Lenders or take such other actions as the Administrative Agent may determine to be necessary to cause the Term Loans to be held by the Lenders pro rata as though there had been no Defaulting Lender, whereupon such Lender will cease to be a Defaulting Lender; provided that no adjustments will be made retroactively with respect to Fees accrued or payments made by or on behalf of the Borrower while that Lender was a Defaulting Lender; and provided, further, that except to the extent otherwise expressly agreed by the affected parties, no change hereunder from Defaulting Lender to Lender will constitute a waiver or release of any claim of any party hereunder arising from that Lender’s having been a Defaulting Lender.

(e)    Purchase of Defaulting Lender’s Commitment/Loans. During any period that a Lender is a Defaulting Lender, the Borrower may, by the Borrower giving written notice thereof to the Administrative Agent, such Defaulting Lender and the other Lenders, demand that such Defaulting Lender assign its Commitment and Loans to an Eligible Assignee subject to and in accordance with the provisions of

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Section 12.5.(b). No party hereto shall have any obligation whatsoever to initiate any such replacement or to assist in finding an Eligible Assignee. In addition, any Lender which is not a Defaulting Lender may, but shall not be obligated, in its sole discretion, to acquire the face amount of all or a portion of such Defaulting Lender’s Commitment and Loans via an assignment subject to and in accordance with the provisions of Section 12.5.(b). In connection with any such assignment, such Defaulting Lender shall promptly execute all documents reasonably requested to effect such assignment, including an appropriate Assignment and Acceptance Agreement. The exercise by the Borrower of its rights under this Section shall be at the Borrower’s sole cost and expense and at no cost or expense to the Administrative Agent or any of the Lenders.

Section 3.12. Taxes.

(a)    Certain Terms. For purposes of this Section, “Applicable Law” includes FATCA.

(b)    Payments Free of Taxes. Any and all payments by or on account of any obligation of the Borrower or any other Loan Party under any Loan Document shall be made without deduction or withholding for any Taxes, except as required by Applicable Law. If any Applicable Law (as determined in the good faith discretion of an applicable Withholding Agent) requires the deduction or withholding of any Tax from any such payment by a Withholding Agent, then the applicable Withholding Agent shall be entitled to make such deduction or withholding and shall timely pay the full amount deducted or withheld to the relevant Governmental Authority in accordance with Applicable Law and, if such Tax is an Indemnified Tax, then the sum payable by the Borrower or other applicable Loan Party shall be increased as necessary so that after such deduction or withholding has been made (including such deductions and withholdings applicable to additional sums payable under this Section) the applicable Recipient receives an amount equal to the sum it would have received had no such deduction or withholding been made.

(c)    Payment of Other Taxes by the Borrower. The Borrower and the other Loan Parties shall timely pay to the relevant Governmental Authority in accordance with Applicable Law, or at the option of the Administrative Agent timely reimburse it for the payment of, any Other Taxes.

(d)    Indemnification by the Borrower. The Borrower and the other Loan Parties shall jointly and severally indemnify each Recipient, within 10 days after demand therefor, for the full amount of any Indemnified Taxes (including Indemnified Taxes imposed or asserted on or attributable to amounts payable under this Section) payable or paid by such Recipient or required to be withheld or deducted from a payment to such Recipient and any reasonable expenses arising therefrom or with respect thereto, whether or not such Indemnified Taxes were correctly or legally imposed or asserted by the relevant Governmental Authority. A certificate as to the amount of such payment or liability delivered to the Borrower by a Lender (with a copy to the Administrative Agent), or by the Administrative Agent on its own behalf or on behalf of a Lender, shall be conclusive absent manifest error.

(e)    Indemnification by the Lenders. Each Lender shall severally indemnify the Administrative Agent, within 10 days after demand therefor, for (i) any Indemnified Taxes attributable to such Lender (but only to the extent that the Borrower or another Loan Party has not already indemnified the Administrative Agent for such Indemnified Taxes and without limiting the obligation of the Borrower and the other Loan Parties to do so), (ii) any Taxes attributable to such Lender’s failure to comply with the provisions of Section 12.5. relating to the maintenance of a Participant Register and (iii) any Excluded Taxes attributable to such Lender, in each case, that are payable or paid by the Administrative Agent in connection with any Loan Document, and any reasonable expenses arising therefrom or with respect thereto, whether or not such Taxes were correctly or legally imposed or asserted by the relevant Governmental Authority. A certificate as to the amount of such payment or liability delivered to any Lender by the Administrative Agent shall be

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conclusive absent manifest error. Each Lender hereby authorizes the Administrative Agent to set off and apply any and all amounts at any time owing to such Lender under any Loan Document or otherwise payable by the Administrative Agent to the Lender from any other source against any amount due to the Administrative Agent under this subsection. The provisions of this subsection shall continue to inure to the benefit of an Administrative Agent following its resignation or removal as Administrative Agent.

(f)    Evidence of Payments. As soon as practicable after any payment of Taxes by the Borrower or any other Loan Party to a Governmental Authority pursuant to this Section, the Borrower or such other Loan Party shall deliver to the Administrative Agent the original or a certified copy of a receipt issued by such Governmental Authority evidencing such payment, a copy of the return reporting such payment or other evidence of such payment reasonably satisfactory to the Administrative Agent.

(g)    Status of Lenders.

(i)    Any Lender that is entitled to an exemption from or reduction of withholding Tax with respect to payments made under any Loan Document shall deliver to the Borrower and the Administrative Agent, at the time or times reasonably requested by the Borrower or the Administrative Agent, such properly completed and executed documentation reasonably requested by the Borrower or the Administrative Agent as will permit such payments to be made without withholding or at a reduced rate of withholding. In addition, any Lender, if reasonably requested by the Borrower or the Administrative Agent, shall deliver such other documentation prescribed by Applicable Law or reasonably requested by the Borrower or the Administrative Agent as will enable the Borrower or the Administrative Agent to determine whether or not such Lender is subject to backup withholding or information reporting requirements. Notwithstanding anything to the contrary in the preceding two sentences, the completion, execution and submission of such documentation (other than such documentation set forth in the immediately following clauses (ii)(A), (ii)(B) and (ii)(D)) shall not be required if in the Lender’s reasonable judgment such completion, execution or submission would subject such Lender to any material unreimbursed cost or expense or would materially prejudice the legal or commercial position of such Lender.

(ii)    Without limiting the generality of the foregoing, in the event that the Borrower is a U.S. Person:

(A)    any Lender that is a U.S. Person shall deliver to the Borrower and the Administrative Agent on or prior to the date on which such Lender becomes a Lender under this Agreement (and from time to time thereafter upon the reasonable request of the Borrower or the Administrative Agent), an electronic copy (or an original if requested by the Borrower or the Administrative Agent) of an executed IRS Form W-9 (or any successor form) certifying that such Lender is exempt from U.S. federal backup withholding tax;

(B)    any Foreign Lender shall, to the extent it is legally entitled to do so, deliver to the Borrower and the Administrative Agent (in such number of copies as shall be requested by the recipient) on or prior to the date on which such Foreign Lender becomes a Lender under this Agreement (and from time to time thereafter upon the reasonable request of the Borrower or the Administrative Agent), whichever of the following is applicable:

(I)    in the case of a Foreign Lender claiming the benefits of an income tax treaty to which the United States is a party (x) with respect to payments of interest under any Loan Document, an electronic copy (or an original if requested

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by the Borrower or the Administrative Agent) of an executed IRS Form W-8BEN or Form W-8BEN-E, as applicable, establishing an exemption from, or reduction of, U.S. federal withholding Tax pursuant to the “interest” article of such tax treaty and (y) with respect to any other applicable payments under any Loan Document, IRS Form W-8BEN or Form W-8BEN-E, as applicable, establishing an exemption from, or reduction of, U.S. federal withholding Tax pursuant to the “business profits” or “other income” article of such tax treaty;

(II)    an electronic copy (or an original if requested by the Borrower or the Administrative Agent) of an executed IRS Form W-8ECI;

(III)    in the case of a Foreign Lender claiming the benefits of the exemption for portfolio interest under Section 881(c) of the Internal Revenue Code, (x) a certificate substantially in the form of Exhibit J-1 to the effect that such Foreign Lender is not a “bank” within the meaning of Section 881(c)(3)(A) of the Internal Revenue Code, a “10 percent shareholder” of the Borrower within the meaning of Section 881(c)(3)(B) of the Internal Revenue Code, or a “controlled foreign corporation” described in Section 881(c)(3)(C) of the Internal Revenue Code (a “U.S. Tax Compliance Certificate”) and (y) executed originals of IRS Form W-8BEN or Form W-8BEN-E, as applicable; or

(IV)    to the extent a Foreign Lender is not the beneficial owner, an electronic copy (or an original if requested by the Borrower or the Administrative Agent) of an executed IRS Form W-8IMY, accompanied by IRS Form W-8ECI, IRS Form W-8BEN or Form W-8BEN-E, as applicable, a U.S. Tax Compliance Certificate substantially in the form of Exhibit J-2 or Exhibit J-3, IRS Form W-9, and/or other certification documents from each beneficial owner, as applicable; provided that if the Foreign Lender is a partnership and one or more direct or indirect partners of such Foreign Lender are claiming the portfolio interest exemption, such Foreign Lender may provide a U.S. Tax Compliance Certificate substantially in the form of Exhibit J-4 on behalf of each such direct and indirect partner;

(C)    any Foreign Lender shall, to the extent it is legally entitled to do so, deliver to the Borrower and the Administrative Agent (in such number of copies as shall be requested by the recipient) on or prior to the date on which such Foreign Lender becomes a Lender under this Agreement (and from time to time thereafter upon the reasonable request of the Borrower or the Administrative Agent), an electronic copy (or an original if requested by the Borrower or the Administrative Agent) of any other form prescribed by Applicable Law as a basis for claiming exemption from or a reduction in U.S. federal withholding Tax, duly completed, together with such supplementary documentation as may be prescribed by Applicable Law to permit the Borrower or the Administrative Agent to determine the withholding or deduction required to be made; and

(D)    if a payment made to a Lender under any Loan Document would be subject to U.S. federal withholding Tax imposed by FATCA if such Lender were to fail to comply with the applicable reporting requirements of FATCA (including those contained in Section 1471(b) or 1472(b) of the Internal Revenue Code, as applicable), such Lender shall deliver to the Borrower and the Administrative Agent at the time or times prescribed by Applicable Law and at such time or times reasonably requested by the Borrower or the Administrative

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Agent such documentation prescribed by Applicable Law (including as prescribed by Section 1471(b)(3)(C)(i) of the Internal Revenue Code) and such additional documentation reasonably requested by the Borrower or the Administrative Agent as may be necessary for the Borrower and the Administrative Agent to comply with their obligations under FATCA and to determine that such Lender has complied with such Lender’s obligations under FATCA or to determine the amount to deduct and withhold from such payment. Solely for purposes of this clause (D), “FATCA” shall include any amendments made to FATCA after the date of this Agreement.

Each Lender agrees that if any form or certification it previously delivered expires or becomes obsolete or inaccurate in any respect, it shall update such form or certification or promptly notify the Borrower and the Administrative Agent in writing of its legal inability to do so.

(h)    Treatment of Certain Refunds. If any party determines, in its sole discretion exercised in good faith, that it has received a refund of any Taxes as to which it has been indemnified pursuant to this Section (including by the payment of additional amounts pursuant to this Section), it shall pay to the indemnifying party an amount equal to such refund (but only to the extent of indemnity payments made under this Section with respect to the Taxes giving rise to such refund), net of all out-of-pocket expenses (including Taxes) of such indemnified party and without interest (other than any interest paid by the relevant Governmental Authority with respect to such refund). Such indemnifying party, upon the request of such indemnified party, shall repay to such indemnified party the amount paid over pursuant to this subsection (plus any penalties, interest or other charges imposed by the relevant Governmental Authority) in the event that such indemnified party is required to repay such refund to such Governmental Authority. Notwithstanding anything to the contrary in this subsection, in no event will the indemnified party be required to pay any amount to an indemnifying party pursuant to this subsection the payment of which would place the indemnified party in a less favorable net after-Tax position than the indemnified party would have been in if the Tax subject to indemnification and giving rise to such refund had not been deducted, withheld or otherwise imposed and the indemnification payments or additional amounts with respect to such Tax had never been paid. This subsection shall not be construed to require any indemnified party to make available its Tax returns (or any other information relating to its Taxes that it deems confidential) to the indemnifying party or any other Person.

(i)    Survival. Each party’s obligations under this Section shall survive the resignation or replacement of the Administrative Agent or any assignment of rights by, or the replacement of, a Lender, the termination of the Commitments and the repayment, satisfaction or discharge of all obligations under any Loan Document.

ARTICLE IV. YIELD PROTECTION, ETC.

Section 4.1. Additional Costs; Capital Adequacy.

(a)    Capital Adequacy. If any Lender determines that any Regulatory Change affecting such Lender or any lending office of such Lender or such Lender’s holding company, if any, regarding capital or liquidity requirements, has or would have the effect of reducing the rate of return on such Lender’s capital or on the capital of such Lender’s holding company, if any, as a consequence of this Agreement, the Commitment of such Lender or the Loans made by such Lender, to a level below that which such Lender or such Lender’s holding company could have achieved but for such Regulatory Change (taking into consideration such Lender’s policies and the policies of such Lender’s holding company with respect to

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capital adequacy), then from time to time the Borrower will pay to such Lender such additional amount or amounts as will compensate such Lender or such Lender’s holding company for any such reduction suffered.

(b)    Additional Costs. In addition to, and not in limitation of the immediately preceding subsection (a), the Borrower shall promptly pay to the Administrative Agent for the account of a Lender from time to time such amounts as such Lender may determine to be necessary to compensate such Lender for any costs incurred by such Lender that it determines are attributable to its making or maintaining of any LIBOR Loans or its obligation to make any LIBOR Loans hereunder, any reduction in any amount receivable by such Lender under this Agreement or any of the other Loan Documents in respect of any of such LIBOR Loans or such obligation or the maintenance by such Lender of capital in respect of its LIBOR Loans or its Commitment (such increases in costs and reductions in amounts receivable being herein called “Additional Costs”), to the extent any such Additional Costs result from any Regulatory Change that: (i) changes the basis of taxation of any amounts payable to such Lender under this Agreement or any of the other Loan Documents in respect of any of such LIBOR Loans or its Commitment (other than Indemnified Taxes, Taxes described in clauses (b) through (d) of the definition of Excluded Taxes and Connection Income Taxes); or (ii) imposes or modifies any reserve, special deposit or similar requirements (other than Regulation D of the Board of Governors of the Federal Reserve System or other reserve requirement to the extent utilized in the determination of Adjusted LIBOR for such LIBOR Loans) relating to any extensions of credit or other assets of, or any deposits with or other liabilities of, such Lender, or any commitment of such Lender (including, without limitation, the Commitment of such Lender hereunder); or (iii) imposes on any Lender or the London interbank market any other condition, cost or expense (other than Taxes) affecting this Agreement or the Loans made by such Lender.

(c)    Lender’s Suspension of LIBOR Loans. Without limiting the effect of the provisions of the immediately preceding subsections (a) and (b), if, by reason of any Regulatory Change, any Lender either (i) incurs or would incur Additional Costs based on or measured by the excess above a specified level of the amount of a category of deposits or other liabilities of such Lender that includes deposits by reference to which the interest rate on LIBOR Loans is determined as provided in this Agreement or a category of extensions of credit or other assets of such Lender that includes LIBOR Loans or (ii) becomes subject to restrictions on the amount of such a category of liabilities or assets that it may hold, then, if such Lender so elects by notice to the Borrower (with a copy to the Administrative Agent), the obligation of such Lender to make or Continue, or to Convert Base Rate Loans into, LIBOR Loans shall be suspended until such Regulatory Change ceases to be in effect (in which case the provisions of Section 4.5. shall apply).

(d)    Notification and Determination of Additional Costs. Each of the Administrative Agent and each Lender agrees to notify the Borrower of any event occurring after the Agreement Date entitling the Administrative Agent or such Lender to compensation under any of the preceding subsections of this Section as promptly as practicable; provided, however, the failure of the Administrative Agent or any Lender to give such notice shall not release the Borrower from any of its obligations hereunder (and in the case of a Lender, to the Administrative Agent); provided, further, that neither the Administrative Agent nor a Lender, as the case may be, shall be entitled to submit a claim for compensation under any of the preceding subsections of this Section unless such Person shall have determined that the making of such claim is consistent with its general practices under similar circumstances in respect of similarly situated borrowers that are equity REITs with credit agreements entitling it to make such claims (it being agreed that neither the Administrative Agent nor a Lender shall be required to disclose any confidential or proprietary information in connection with such determination or the making of such claim). The Administrative Agent or such Lender agrees to furnish to the Borrower (and in the case of a Lender, to the Administrative Agent) a certificate executed by a Person that has authority to execute such certificate on behalf of the Administrative Agent or such Lender, as the case may be, setting forth the basis and amount of each request by the Administrative Agent or such Lender

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for compensation under any of the preceding subsections of this Section and stating that such claim is consistent with such Person’s general practices under similar circumstances in respect of similarly situated borrowers that are equity REITs with credit agreements entitling it to make such claims. Absent manifest error, determinations by the Administrative Agent or any Lender of the effect of any Regulatory Change shall be conclusive, provided that such determinations are made on a reasonable basis and in good faith. The Borrower shall pay the Administrative Agent or any Lender, as the case may be, the amount shown as due on any such certificate within 10 days after receipt thereof.

Section 4.2. Suspension of LIBOR Loans.

Anything herein to the contrary notwithstanding, if, on or prior to the determination of LIBOR for any Interest Period:

(a)    the Administrative Agent reasonably determines (which determination shall be conclusive) that by reason of circumstances affecting the relevant market, adequate and reasonable means do not exist for ascertaining Adjusted LIBOR for such Interest Period;

(b)    the Administrative Agent reasonably determines (which determination shall be conclusive) that Adjusted LIBOR will not adequately and fairly reflect the cost to the Lenders of making or maintaining LIBOR Loans for such Interest Period; or

(c)    the Administrative Agent reasonably determines (which determination shall be conclusive) that quotations of interest rates for the relevant deposits referred to in the definition of LIBOR are not being provided in the relevant amounts or for the relevant maturities for purposes of determining rates of interest for LIBOR Loans as provided herein;

then the Administrative Agent shall give the Borrower and each Lender prompt notice thereof and, so long as such condition remains in effect, the Lenders shall be under no obligation to, and shall not, make additional LIBOR Loans, Continue LIBOR Loans or Convert Loans into LIBOR Loans and the Borrower shall, on the last day of each current Interest Period for each outstanding LIBOR Loan, either repay such Loan or Convert such Loan into a Base Rate Loan.

Section 4.3. Illegality.

Notwithstanding any other provision of this Agreement, if any Lender shall reasonably determine (which determination shall be conclusive and binding) that it has become unlawful for such Lender to honor its obligation to make or maintain LIBOR Loans hereunder, then such Lender shall promptly notify the Borrower thereof (with a copy to the Administrative Agent) and such Lender’s obligation to make or Continue, or to Convert Loans of any other Type into, LIBOR Loans shall be suspended until such time as such Lender may again make and maintain LIBOR Loans (in which case the provisions of Section 4.5. shall be applicable).

Section 4.4. Compensation.

The Borrower shall pay to the Administrative Agent for the account of each Lender, upon the request of such Lender through the Administrative Agent, such amount or amounts as shall be sufficient (in the reasonable opinion of such Lender) to compensate it for any loss, cost or expense that such Lender reasonably determines is attributable to:

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(a)    any payment or prepayment (whether mandatory or optional) of a LIBOR Loan, or Conversion of a LIBOR Loan, made by such Lender for any reason (including, without limitation, acceleration) on a date other than the last day of the Interest Period for such Loan; or

(b)    any failure by the Borrower for any reason (including, without limitation, the failure of any of the applicable conditions precedent specified in Article V. to be satisfied) to borrow a LIBOR Loan from such Lender on the requested date for such borrowing, or to Convert a Base Rate Loan into a LIBOR Loan or Continue a LIBOR Loan on the requested date of such Conversion or Continuation.

Upon the Borrower’s request, any Lender requesting compensation under this Section shall provide the Borrower with a statement setting forth the basis for requesting such compensation and the method for determining the amount thereof. Absent manifest error, determinations by any Lender in any such statement shall be conclusive, provided that such determinations are made on a reasonable basis and in good faith.

Section 4.5. Treatment of Affected Loans.

If the obligation of any Lender to make LIBOR Loans or to Continue, or to Convert Base Rate Loans into, LIBOR Loans shall be suspended pursuant to Section 4.1.(c) or 4.3., then such Lender’s LIBOR Loans shall be automatically Converted into Base Rate Loans on the last day(s) of the then current Interest Period(s) for LIBOR Loans (or, in the case of a Conversion required by Section 4.1.(c) or 4.3., on such earlier date as such Lender or the Administrative Agent, as applicable, may specify to the Borrower (with a copy to the Administrative Agent, as applicable)) and, unless and until such Lender gives notice as provided below that the circumstances specified in Section 4.1. or 4.3. that gave rise to such Conversion no longer exist:

(a)    to the extent that such Lender’s LIBOR Loans have been so Converted, all payments and prepayments of principal that would otherwise be applied to such Lender’s LIBOR Loans shall be applied instead to its Base Rate Loans; and

(b)    all Loans that would otherwise be made or Continued by such Lender as LIBOR Loans shall be made or Continued instead as Base Rate Loans, and all Base Rate Loans of such Lender that would otherwise be Converted into LIBOR Loans shall remain as Base Rate Loans.

If such Lender or the Administrative Agent, as applicable, gives notice to the Borrower (with a copy to the Administrative Agent, as applicable) that the circumstances specified in Section 4.1. or 4.3. that gave rise to the Conversion of such Lender’s LIBOR Loans pursuant to this Section no longer exist (which such Lender or the Administrative Agent, as applicable, agrees to do promptly upon such circumstances ceasing to exist) at a time when LIBOR Loans made by other Lenders are outstanding, then such Lender’s Base Rate Loans shall be automatically Converted, on the first day(s) of the next succeeding Interest Period(s) for such outstanding LIBOR Loans, to the extent necessary so that, after giving effect thereto, all Loans held by the Lenders holding LIBOR Loans and by such Lender are held pro rata (as to principal amounts, Types and Interest Periods) in accordance with their respective Commitments.

Section 4.6. Affected Lenders.

If (a) a Lender requests compensation pursuant to Section 3.12. or 4.1., and the Requisite Lenders are not also doing the same, or (b) the obligation of any Lender to make LIBOR Loans or to Continue, or to Convert Base Rate Loans into, LIBOR Loans shall be suspended pursuant to Section 4.1.(c) or 4.3. but the obligation of the Requisite Lenders shall not have been suspended under such Sections, then, so long as

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there does not then exist any Default or Event of Default, the Borrower may demand that such Lender (the “Affected Lender”), and upon such demand the Affected Lender shall promptly, assign its Commitment and Loans to an Eligible Assignee subject to and in accordance with the provisions of Section 12.5.(b) for a purchase price equal to (x) the aggregate principal balance of all Loans then owing to the Affected Lender, plus (y) any accrued but unpaid interest thereon and accrued but unpaid fees owing to the Affected Lender, or any other amount as may be mutually agreed upon by such Affected Lender and Eligible Assignee. Each of the Administrative Agent and the Affected Lender shall reasonably cooperate in effectuating the replacement of such Affected Lender under this Section, but at no time shall the Administrative Agent, such Affected Lender, any other Lender or any Titled Agent be obligated in any way whatsoever to initiate any such replacement or to assist in finding an Eligible Assignee. The exercise by the Borrower of its rights under this Section shall be at the Borrower’s sole cost and expense and at no cost or expense to the Administrative Agent, the Affected Lender or any of the other Lenders. The terms of this Section shall not in any way limit the Borrower’s obligation to pay to any Affected Lender compensation owing to such Affected Lender pursuant to this Agreement (including, without limitation, pursuant to Sections 3.12., 4.1.or 4.4.) with respect to any period up to the date of replacement.

Section 4.7. Change of Lending Office.

Each Lender agrees that it will use reasonable efforts to designate an alternate Lending Office with respect to any of its Loans affected by the matters or circumstances described in Sections 3.12., 4.1. or 4.3. to reduce the liability of the Borrower or avoid the results provided thereunder, so long as such designation is not disadvantageous to such Lender as determined by such Lender in its sole discretion, except that such Lender shall have no obligation to designate a Lending Office located in the United States of America.

Section 4.8. Assumptions Concerning Funding of LIBOR Loans.

Calculation of all amounts payable to a Lender under this Article IV. shall be made as though such Lender had actually funded LIBOR Loans through the purchase of deposits in the relevant market bearing interest at the rate applicable to such LIBOR Loans in an amount equal to the amount of the LIBOR Loans and having a maturity comparable to the relevant Interest Period; provided, however, that each Lender may fund each of its LIBOR Loans in any manner it sees fit and the foregoing assumption shall be used only for calculation of amounts payable under this Article IV.

ARTICLE V. CONDITIONS PRECEDENT

Section 5.1. Initial Conditions Precedent.

The obligation of the Lenders to make the initial Loans hereunder is subject to the following conditions precedent:

(a)    The Administrative Agent shall have received each of the following, in form and substance satisfactory to the Administrative Agent:

(i)    Counterparts of this Agreement executed by each of the parties hereto;

(ii)    Term Notes executed by the Borrower, payable to each Lender that has requested that it receive a Note and complying with the applicable provisions of Section 2.8.;

(iii)    the Guaranty executed by the Parent;

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(iv)    an opinion of the general counsel of the Parent and the other Loan Parties, addressed to the Administrative Agent and the Lenders, addressing the matters set forth in Exhibit F;

(v)    an opinion of Alston & Bird, LLP, counsel to the Administrative Agent, addressed to the Administrative Agent and the Lenders, addressing the enforceability of the Loan Documents and such matters as the Administrative Agent shall reasonably request;

(vi)    a certificate of incumbency signed by the secretary or assistant secretary of the Parent with respect to each of the officers of the Parent authorized to execute and deliver on behalf of the Parent and the Borrower the Loan Documents to which the Parent or the Borrower is a party and to execute and deliver (or make by telephone in the case of Notices of Conversion or Continuation), on behalf of the Borrower, Notices of Borrowing, Notices of Conversion and Notices of Continuation;

(vii)    a certified copy (certified by the secretary or assistant secretary of the Parent) of all necessary action taken by the Parent to authorize the execution, delivery and performance of the Loan Documents to which either the Parent or the Borrower is a party;

(viii)    the declaration of trust of the Parent and the certificate of limited partnership of the Borrower, in each case, certified by the Secretary of State of the State of formation of such Person (a copy of which was provided in accordance with the Existing Credit Agreement), certified by the secretary or assistant secretary (or other individual performing similar functions) of the Parent and the Borrower as being true, correct and unmodified in all respects since the date so certified;

(ix)    a Certificate of Good Standing or certificate of similar meaning with respect to the Parent and the Borrower issued as of a recent date by the Secretary of State of the State of formation of each such Person and certificates of qualification to transact business or other comparable certificates issued by each Secretary of State (and any state department of taxation, as applicable) of each state in which each such Person is required to be so qualified where failure to be so qualified could reasonably be expected to have a Material Adverse Effect;

(x)    copies certified by the secretary or assistant secretary (or other individual performing similar functions) of the Parent and the Borrower of the by-laws of the Parent and the limited partnership agreement of the Borrower;

(xi)    the Fees then due and payable under Section 3.6., and any other Fees payable to the Administrative Agent, the Titled Agents and the Lenders on or prior to the Effective Date;

(xii)    a Compliance Certificate calculated as of September 30, 2015, giving pro forma effect to the financing contemplated by this Agreement and the use of the proceeds of the Loans to be funded on the Effective Date;

(xiii)    a payoff letter from Keybank National Association, as administrative agent under the Existing Term Loan Agreement, providing for the repayment in full of all loans outstanding thereunder; and

(xiv)    such other documents, agreements and instruments as the Administrative Agent on behalf of the Lenders may reasonably request; and

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(b)    In the good faith judgment of the Administrative Agentand the Lenders:

(i)    There shall not have occurred or become known to the Administrative Agentor any of the Lenders any event, condition, situation or status since the date of the information contained in the financial and business projections, budgets, pro forma data and forecasts concerning the Borrower and its Subsidiaries delivered to the Administrative Agent and the Lenders prior to the Agreement Date that has had or could reasonably be expected to result in a Material Adverse Effect;

(ii)    No litigation, action, suit, investigation or other arbitral, administrative or judicial proceeding shall be pending or threatened which could reasonably be expected to (1) result in a Material Adverse Effect or (2) restrain or enjoin, impose materially burdensome conditions on, or otherwise materially and adversely affect the ability of the Borrower or any other Loan Party to fulfill its obligations under the Loan Documents to which it is a party;

(iii)    The Borrower and its Subsidiaries shall have received all approvals, consents and waivers, and shall have made or given all necessary filings and notices as shall be required to consummate the transactions contemplated hereby without the occurrence of any default under, conflict with or violation of (1) any Applicable Law or (2) any agreement, document or instrument to which the Borrower or any other Loan Party is a party or by which any of them or their respective properties is bound, except for such approvals, consents, waivers, filings and notices the receipt, making or giving of which would not reasonably be likely to (A) have a Material Adverse Effect, or (B) restrain or enjoin, impose materially burdensome conditions on, or otherwise materially and adversely affect the ability of the Borrower or any other Loan Party to fulfill its obligations under the Loan Documents to which it is a party; and

(iv)    There shall not have occurred or exist any other material disruption of financial or capital markets that could reasonably be expected to materially and adversely affect the transactions contemplated by the Loan Documents.

Section 5.2. Conditions Precedent to All Loans.

The obligation of the Lenders to make any Loans is all subject to the further condition precedent that: (a) no Default or Event of Default shall exist as of the date of the making of such Loan or would exist immediately after giving effect thereto; (b) the representations and warranties made or deemed made by the Borrower and each other Loan Party in the Loan Documents to which any of them is a party shall be true and correct in all material respects (except to the extent otherwise qualified by materiality, in which case such representation or warranty shall be true and correct in all respects) on and as of the date of the making of such Loan with the same force and effect as if made on and as of such date except to the extent that such representations and warranties expressly relate solely to an earlier date (in which case such representations and warranties shall have been true and correct in all material respects (except to the extent otherwise qualified by materiality, in which case such representation or warranty shall have been true and correct in all respects) on and as of such earlier date) and except for changes in factual circumstances not prohibited under the Loan Documents, and (c) the Administrative Agent shall have received a timely Notice of Borrowing. Each Credit Event shall constitute a certification by the Borrower to the effect set forth in the preceding sentence (both as of the date of the giving of notice relating to such Credit Event and, unless the Borrower otherwise notifies the Administrative Agent prior to the date of such Credit Event, as of the date of the occurrence of such Credit Event). In addition, if such Credit Event is the making of a Loan, the Borrower shall be deemed to

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have represented to the Administrative Agent and the Lenders at the time such Loan is made that all conditions to the occurrence of such Credit Event contained in Article V. have been satisfied.

Section 5.3. Conditions as Covenants.

If the Lenders make any Loans prior to the satisfaction of all conditions precedent set forth in Sections 5.1. and 5.2., the Borrower shall nevertheless cause such condition or conditions to be satisfied within 5 Business Days after the date of the making of such Loans. Unless set forth in writing to the contrary, the making of its initial Loan by a Lender shall constitute a certification by such Lender to the Administrative Agent and the other Lenders that the Borrower has satisfied the conditions precedent for initial Loans set forth in Sections 5.1. and 5.2.

ARTICLE VI. REPRESENTATIONS AND WARRANTIES

Section 6.1. Representations and Warranties.

In order to induce the Administrative Agent and each Lender to enter into this Agreement and to make Loans, the Parent and the Borrower represent and warrant to the Administrative Agent and each Lender as follows:

(a)    Organization; Power; Qualification. Each of the Parent, its Subsidiaries, the Borrower and the other Loan Parties is a corporation, partnership or other legal entity, duly organized or formed, validly existing and in good standing under the jurisdiction of its incorporation or formation, has the power and authority to own or lease its respective properties and to carry on its respective business as now being and hereafter proposed to be conducted and is duly qualified and is in good standing as a foreign corporation, partnership or other legal entity, and authorized to do business, in each jurisdiction in which the character of its properties or the nature of its business requires such qualification or authorization and where the failure to be so qualified or authorized could reasonably be expected to have, in each instance, a Material Adverse Effect.

(b)    Ownership Structure. As of the Agreement Date, Part I of Schedule 6.1.(b) is a complete and correct list of all Subsidiaries of the Parent setting forth for each such Subsidiary, (i) the jurisdiction of organization of such Subsidiary, (ii) each Person holding any Equity Interests in such Subsidiary, (iii) the nature of the Equity Interests held by each such Person, (iv) the percentage of ownership of such Subsidiary represented by such Equity Interests and (v) whether such Subsidiary is a Material Subsidiary. Except as disclosed in such Schedule, as of the Agreement Date (i) each of the Parent and its Subsidiaries owns, free and clear of all Liens (other than Permitted Liens of the types described in clauses (a), (e) and (f) of the definition of the term “Permitted Liens”), and has the unencumbered right to vote, all outstanding Equity Interests in each Person shown to be held by it on such Schedule, (ii) all of the issued and outstanding capital stock of each such Person organized as a corporation is validly issued, fully paid and nonassessable and (iii) there are no outstanding subscriptions, options, warrants, commitments, preemptive rights or agreements of any kind (including, without limitation, any stockholders’ or voting trust agreements) for the issuance, sale, registration or voting of, or outstanding securities convertible into, any additional shares of capital stock of any class, or partnership or other ownership interests of any type in, any such Person. As of the Agreement Date Part II of Schedule 6.1.(b) correctly sets forth all Unconsolidated Affiliates of the Parent, including the correct legal name of such Person, the type of legal entity which each such Person is, and all Equity Interests in such Person held directly or indirectly by the Parent.

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(c)    Authorization of Agreement, Etc. The Borrower has the right and power, and has taken all necessary action to authorize it, to borrow and obtain other extensions of credit hereunder. The Parent, the Borrower and each other Loan Party has the right and power, and has taken all necessary action to authorize it, to execute, deliver and perform each of the Loan Documents to which it is a party in accordance with their respective terms and to consummate the transactions contemplated hereby and thereby. The Loan Documents to which the Borrower or any other Loan Party is a party have been duly executed and delivered by the duly authorized officers of such Person and each is a legal, valid and binding obligation of such Person enforceable against such Person in accordance with its respective terms except as the same may be limited by bankruptcy, insolvency, and other similar laws affecting the rights of creditors generally and the availability of equitable remedies for the enforcement of certain obligations (other than the payment of principal) contained herein or therein and as may be limited by equitable principles generally.

(d)    Compliance of Loan Documents with Laws, Etc. The execution, delivery and performance of this Agreement, the Notes and the other Loan Documents to which the Borrower or any other Loan Party is a party in accordance with their respective terms and the borrowings and other extensions of credit hereunder do not and will not, by the passage of time, the giving of notice, or both: (i) require any Governmental Approval or violate any Applicable Law (including all Environmental Laws) relating to the Borrower or any other Loan Party; (ii) conflict with, result in a breach of or constitute a default under the organizational documents of the Borrower or any other Loan Party, or any indenture, agreement or other instrument to which the Borrower or any other Loan Party is a party or by which it or any of its respective properties may be bound; or (iii) result in or require the creation or imposition of any Lien upon or with respect to any property now owned or hereafter acquired by the Borrower or any other Loan Party.

(e)    Compliance with Law; Governmental Approvals. The Parent, the Borrower, each Subsidiary and each other Loan Party is in compliance with each Governmental Approval applicable to it and in compliance with all other Applicable Laws (including without limitation, Environmental Laws) relating to the Parent, the Borrower, a Subsidiary or such other Loan Party except for noncompliances which, and Governmental Approvals the failure to possess which, could not, individually or in the aggregate, reasonably be expected to cause a Default or Event of Default or have a Material Adverse Effect.

(f)    Title to Properties; Liens. As of the Agreement Date, Part I of Schedule 6.1.(f) sets forth all of the real property owned or leased by the Parent, the Borrower, each other Loan Party and each other Subsidiary. Each such Person has good, marketable and legal title to, or a valid leasehold interest in, its respective assets. As of the Agreement Date, there are no Liens against any assets of the Parent, the Borrower, any Subsidiary or any other Loan Party except for Permitted Liens, including, without limitation, those Liens in existence as of the Agreement Date and set forth in Part II of Schedule 6.1.(f).

(g)    Existing Indebtedness. Schedule 6.1.(g) is, as of the Agreement Date, a complete and correct listing of all Indebtedness of the Parent and its Subsidiaries, including without limitation, Guarantees of the Parent and its Subsidiaries, and indicating whether such Indebtedness is Secured Indebtedness or Unsecured Indebtedness. The Parent and its Subsidiaries have performed and are in compliance with all of the terms of such Indebtedness and all instruments and agreements relating thereto, and no default or event of default, or event or condition which with the giving of notice, the lapse of time, or both, would constitute such a default or event of default, exists with respect to any such Indebtedness.

(h)    [Intentionally Omitted.].

(i)    Litigation. Except as set forth on Schedule 6.1.(i), there are no actions, suits, investigations or proceedings pending (nor, to the knowledge of the Parent or the Borrower, are there any actions, suits or

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proceedings threatened, nor to the knowledge of the Parent or the Borrower is there any basis therefor) against or in any other way relating adversely to or affecting the Parent, the Borrower, any Subsidiary or any other Loan Party or any of its respective property in any court or before any arbitrator of any kind or before or by any other Governmental Authority which could reasonably be expected to have a Material Adverse Effect. There are no strikes, slow downs, work stoppages or walkouts or other labor disputes in progress or threatened relating to the Parent, the Borrower, any Subsidiary or any other Loan Party which could reasonably be expected to have a Material Adverse Effect.

(j)    Taxes. All federal, state and other tax returns of the Parent, the Borrower, any Subsidiary or any other Loan Party required by Applicable Law to be filed have been duly filed, and all federal, state and other taxes, assessments and other governmental charges or levies upon the Parent, the Borrower, any Subsidiary and each other Loan Party and its respective properties, income, profits and assets which are due and payable have been paid, except any such nonpayment which is at the time permitted under Section 7.6. As of the Agreement Date, none of the United States income tax returns of the Parent, the Borrower, its Subsidiaries or any other Loan Party is under audit. All charges, accruals and reserves on the books of the Parent, the Borrower and each of its Subsidiaries and each other Loan Party in respect of any taxes or other governmental charges are in accordance with GAAP.

(k)    Financial Statements. The Parent and the Borrower have furnished to each Lender copies of (i) the audited consolidated balance sheet of the Parent and its consolidated Subsidiaries for the fiscal year ending December 31, 2014, and the related audited consolidated statements of operations, cash flows and shareholders’ equity for the fiscal year ending on such dates, with the opinion thereon of PricewaterhouseCoopers LLP, and (ii) the unaudited consolidated balance sheet of the Parent and its consolidated Subsidiaries for the fiscal quarter ending September 30, 2015, and the related unaudited consolidated statements of operations, cash flows and shareholders’ equity of the Parent and its consolidated Subsidiaries for such fiscal quarter. Such financial statements (including in each case related schedules and notes) are complete and correct and present fairly, in accordance with GAAP consistently applied throughout the periods involved, the consolidated financial position of the Parent and its consolidated Subsidiaries as at their respective dates and the results of operations and the cash flow for such periods (subject, as to interim statements, to changes resulting from normal year‑end audit adjustments). Neither the Parent nor any of its Subsidiaries has on the Agreement Date any material contingent liabilities, liabilities, liabilities for taxes, unusual or long-term commitments or unrealized or forward anticipated losses from any unfavorable commitments, except as referred to or reflected or provided for in said financial statements.

(l)    No Material Adverse Change. Since December 31, 2014, there has been no material adverse change in the business, assets, liabilities, financial condition, results of operations, business or prospects of the Parent and its Subsidiaries taken as a whole. Each of the Parent, its Subsidiaries and the other Loan Parties is Solvent.

(m)    ERISA.

(i)    Each Benefit Arrangement is in compliance with the applicable provisions of ERISA, the Internal Revenue Code and other Applicable Laws in all material respects. Except with respect to Multiemployer Plans, each Qualified Plan (A) has received a favorable determination from the Internal Revenue Service applicable to such Qualified Plan’s current remedial amendment cycle (as defined in Revenue Procedure 2007-44 or “2007-44” for short), (B) has timely filed for a favorable determination letter from the Internal Revenue Service during its staggered remedial amendment cycle (as defined in 2007-44) and such application is currently being processed by the Internal Revenue Service, or (C) is maintained under a prototype plan and may rely upon a favorable

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opinion letter issued by the Internal Revenue Service with respect to such prototype plan. To the best knowledge of the Borrower, nothing has occurred which would cause the loss of its reliance on each Qualified Plan’s favorable determination letter or opinion letter.

(ii)    With respect to any Benefit Arrangement that is a retiree welfare benefit arrangement, all amounts have been accrued on the applicable ERISA Group’s financial statements in accordance with FASB ASC 715. The “benefit obligation” of all Plans does not exceed the “fair market value of plan assets” for such Plans by more than $10,000,000 all as determined by and with such terms defined in accordance with FASB ASC 715.

(iii)    Except as could not reasonably be expected, individually or in the aggregate, to have a Material Adverse Effect: (i) no ERISA Event has occurred or is expected to occur; (ii) there are no pending, or to the best knowledge of the Borrower, threatened, claims, actions or lawsuits or other action by any Governmental Authority, plan participant or beneficiary with respect to a Benefit Arrangement (other than routine claims for benefits); (iii) there are no violations of the fiduciary responsibility rules with respect to any Benefit Arrangement; and (iv) no member of the ERISA Group has engaged in a non-exempt “prohibited transaction,” as defined in Section 406 of ERISA and Section 4975 of the Internal Revenue Code, in connection with any Plan, that would subject any member of the ERISA Group to a tax on prohibited transactions imposed by Section 502(i) of ERISA or Section 4975 of the Internal Revenue Code.

(n)    Not Plan Assets; No Prohibited Transaction. None of the assets of the Parent, the Borrower, any Subsidiary or any other Loan Party constitute “plan assets” within the meaning of ERISA, the Internal Revenue Code and the respective regulations promulgated thereunder. The execution, delivery and performance of this Agreement and the other Loan Documents, and the borrowing and repayment of amounts hereunder, do not and will not constitute “prohibited transactions” under ERISA or the Internal Revenue Code.

(o)    Absence of Defaults. Neither the Parent, the Borrower, any Subsidiary nor any other Loan Party is in default under its articles of incorporation, bylaws, partnership agreement or other similar organizational documents, and no event has occurred, which has not been remedied, cured or waived, which, in any such case: (i) constitutes a Default or an Event of Default; or (ii) constitutes, or which with the passage of time, the giving of notice, a determination of materiality, the satisfaction of any condition, or any combination of the foregoing, would constitute, a default or event of default by the Parent, the Borrower, any Subsidiary or any other Loan Party under any agreement (other than this Agreement) or judgment, decree or order to which the Parent, the Borrower or any Subsidiary or other Loan Party is a party or by which the Parent, the Borrower or any Subsidiary or other Loan Party or any of their respective properties may be bound where such default or event of default could, individually or in the aggregate, reasonably be expected to have a Material Adverse Effect.

(p)    Environmental Laws. Each of the Parent, the Borrower, the Subsidiaries and the other Loan Parties has obtained all Governmental Approvals which are required under Environmental Laws and is in compliance with all terms and conditions of such Governmental Approvals which the failure to obtain or to comply with could reasonably be expected to have a Material Adverse Effect. Except for any of the following matters that could not be reasonably expected to have a Material Adverse Effect, (i) neither the Parent nor the Borrower is aware of, and has not received notice of, any past, present, or future events, conditions, circumstances, activities, practices, incidents, actions, or plans which, with respect to the Parent or the Borrower, the Subsidiaries and each other Loan Party, may interfere with or prevent compliance or continued compliance with Environmental Laws, or may give rise to any common‑law or legal liability, or otherwise

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form the basis of any claim, action, demand, suit, proceeding, hearing, study, or investigation, based on or related to the manufacture, processing, distribution, use, treatment, storage, disposal, transport, or handling or the emission, discharge, release or threatened release into the environment, of any pollutant, contaminant, chemical, or industrial, toxic, or other Hazardous Material; and (ii) there is no civil, criminal, or administrative action, suit, demand, claim, hearing, notice, or demand letter, notice of violation, investigation, or proceeding pending or, to the Parent’s and the Borrower’s knowledge after due inquiry, threatened, against the Parent, the Borrower, the Subsidiaries and each other Loan Party relating in any way to Environmental Laws.

(q)    Investment Company; Etc. Neither the Parent nor the Borrower nor any Subsidiary nor any other Loan Party is (i) an “investment company” or a company “controlled” by an “investment company” within the meaning of the Investment Company Act of 1940, as amended or (ii) subject to any other Applicable Law which purports to regulate or restrict its ability to borrow money or to consummate the transactions contemplated by this Agreement or to perform its obligations under any Loan Document to which it is a party.

(r)    Margin Stock. Neither the Parent nor the Borrower nor any Subsidiary nor any other Loan Party is engaged principally, or as one of its important activities, in the business of extending credit for the purpose, whether immediate, incidental or ultimate, of buying or carrying “margin stock” within the meaning of Regulation U of the Board of Governors of the Federal Reserve System.

(s)    Affiliate Transactions. Except as permitted by Section 9.9., neither the Parent nor the Borrower nor any Subsidiary nor any other Loan Party is a party to or bound by any agreement or arrangement (whether oral or written) to which any Affiliate of the Parent, the Borrower, any Subsidiary or any other Loan Party is a party.

(t)    Intellectual Property. Each of the Parent, the Borrower, each other Loan Party and each other Subsidiary owns or has the right to use, under valid license agreements or otherwise, all material patents, licenses, franchises, trademarks, trademark rights, trade names, trade name rights, trade secrets and copyrights (collectively, “Intellectual Property”) necessary to the conduct of its businesses as now conducted and as contemplated by the Loan Documents, without known conflict with any patent, license, franchise, trademark, trade secret, trade name, copyright, or other proprietary right of any other Person. The Parent, the Borrower, each other Loan Party and each other Subsidiary have taken all such steps as they deem reasonably necessary to protect their respective rights under and with respect to such Intellectual Property. No material claim has been asserted by any Person with respect to the use of any Intellectual Property by the Parent, the Borrower, any other Loan Party or any other Subsidiary, or challenging or questioning the validity or effectiveness of any Intellectual Property. The use of such Intellectual Property by the Parent, the Borrower, the Subsidiaries and the other Loan Parties, does not infringe on the rights of any Person, subject to such claims and infringements as do not, in the aggregate, give rise to any liabilities on the part of the Parent, the Borrower, any other Loan Party or any other Subsidiary that could reasonably be expected to have a Material Adverse Effect.

(u)    Business. As of the Agreement Date, the Parent and its Subsidiaries are engaged in the business of owning, managing, leasing, acquiring and developing real properties located in the United States of America, together with other business activities incidental thereto.

(v)    Broker’s Fees. No broker’s or finder’s fee, commission or similar compensation will be payable with respect to the transactions contemplated hereby. No other similar fees or commissions will be payable by any Loan Party for any other services rendered to the Parent or any of its Subsidiaries ancillary to the transactions contemplated hereby.

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(w)    Accuracy and Completeness of Information. No written information, report or other papers or data (excluding financial projections and other forward looking statements) furnished to the Administrative Agent or any Lender by, on behalf of, or at the direction of, the Parent, the Borrower, any Subsidiary or any other Loan Party in connection with or relating in any way to this Agreement, contained any untrue statement of a fact material to the creditworthiness of the Parent, the Borrower, any Subsidiary or any other Loan Party or omitted to state a material fact necessary in order to make such statements contained therein, in light of the circumstances under which they were made, not misleading. All financial statements furnished to the Administrative Agent or any Lender by, on behalf of, or at the direction of, the Parent, the Borrower, any Subsidiary or any other Loan Party in connection with or relating in any way to this Agreement, present fairly, in accordance with GAAP consistently applied throughout the periods involved, the financial position of the Persons involved as at the date thereof and the results of operations for such periods. All financial projections and other forward looking statements prepared by or on behalf of the Parent, the Borrower, any Subsidiary or any other Loan Party that have been or may hereafter be made available to the Administrative Agent or any Lender were or will be prepared in good faith based on reasonable assumptions. As of the Effective Date, no fact is known to the Parent or the Borrower which has had, or may in the future have (so far as the Parent or the Borrower can reasonably foresee), a Material Adverse Effect which has not been set forth in the financial statements referred to in Section 6.1.(k) or in such information, reports or other papers or data or otherwise disclosed in writing to the Administrative Agent and the Lenders.

(x)    REIT Status. The Parent qualifies as a REIT and is in compliance with all requirements and conditions imposed under the Internal Revenue Code to allow the Parent to maintain its status as a REIT.

(y)    Properties. As of the Agreement Date, Schedule 6.1.(y) is a correct and complete list of all Properties included in the calculation of Unencumbered Asset Value. Each of the assets included by the Borrower in calculations of Unencumbered Asset Value satisfies all of the requirements contained in the definitions of “Wholly Owned Property”, or “Controlled Property”, as applicable, and “Eligible Unencumbered Property”.

(z)    Anti-Corruption Laws and Sanctions; Anti-Terrorism Laws. None of the Parent, the Borrower, any Subsidiary, any of their respective directors, or officers, or, to the knowledge of the Parent or the Borrower, any of the Parent’s, Borrower’s or any Subsidiary’s employees and agents (i) is an “enemy” or an “ally of the enemy” within the meaning of Section 2 of the Trading with the Enemy Act of the United States, 50 U.S.C. App. §§ 1 et seq., as amended (the “Trading with the Enemy Act”) or (ii) is in violation of (A) the Trading with the Enemy Act, (B) any of the foreign assets control regulations of the United States Treasury Department or any enabling legislation or executive order relating thereto, including without limitation, Executive Order No. 13224, effective as of September 24, 2001 relating to Blocking Property and Prohibiting Transactions With Persons Who Commit, Threaten to Commit or Support Terrorism (66 Fed. Reg. 49079 (2001) or (C) the Patriot Act (collectively, the “Anti-Terrorism Laws”). The Parent and the Borrower have implemented and maintain in effect policies and procedures designed to ensure compliance by the Parent, the Borrower, their respective Subsidiaries and the Parent’s, the Borrower’s and their respective Subsidiaries’ respective directors, officers, employees and agents (in their capacities as such) with Anti-Corruption Laws, Anti-Terrorism Laws and applicable Sanctions, and the Parent, the Borrower, their respective Subsidiaries and the Parent’s, the Borrower’s and their respective Subsidiaries’ respective directors, officers, employees and agents are in compliance with Anti-Corruption Laws, Anti-Terrorism Laws and applicable Sanctions in all material respects. None of the Parent, the Borrower or any Subsidiary is, or derives any of its assets or operating income from investments in or transactions with, a Sanctioned Person, and none of the respective directors, officers, or, to the knowledge of the Parent and the Borrower, employees or agents of the Parent, the Borrower or any of their respective Subsidiaries is a Sanctioned Person.

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Section 6.2. Survival of Representations and Warranties, Etc.

All statements contained in any certificate, financial statement or other instrument delivered by or on behalf of the Parent, the Borrower, any Subsidiary or any other Loan Party to the Administrative Agent or any Lender pursuant to or in connection with this Agreement or any of the other Loan Documents (including, but not limited to, any such statement made in or in connection with any amendment thereto or any statement contained in any certificate, financial statement or other instrument delivered by or on behalf of the Parent or the Borrower prior to the Agreement Date and delivered to the Administrative Agent or any Lender in connection with the underwriting or closing of the transactions contemplated hereby) shall constitute representations and warranties made by the Borrower and the Parent in favor of the Administrative Agent or any of the Lenders under this Agreement. All representations and warranties made under this Agreement and the other Loan Documents shall be deemed to be made at and as of the Agreement Date, the Effective Date, the date on which the making of Additional Term Loans is effectuated pursuant to Section 2.9., and at and as of the date of the occurrence of any Credit Event, except to the extent that such representations and warranties expressly relate solely to an earlier date (in which case such representations and warranties shall have been true and accurate on and as of such earlier date) and except for changes in factual circumstances not prohibited hereunder. All such representations and warranties shall survive the effectiveness of this Agreement, the execution and delivery of the Loan Documents and the making of the Loans.

ARTICLE VII. AFFIRMATIVE COVENANTS

For so long as this Agreement is in effect, unless the Requisite Lenders (or, if required pursuant to Section 12.6., all of the Lenders) shall otherwise consent in the manner provided for in Section 12.6., the Parent and the Borrower shall comply with the following covenants:

Section 7.1. Preservation of Existence and Similar Matters.

Except as otherwise permitted under Section 9.5., the Parent and the Borrower shall, and shall cause each Subsidiary and each other Loan Party to, preserve and maintain its respective existence, rights, franchises, licenses and privileges in the jurisdiction of its incorporation or formation and qualify and remain qualified and authorized to do business in each jurisdiction in which the character of its properties or the nature of its business requires such qualification and authorization and where the failure to be so authorized and qualified could reasonably be expected to have a Material Adverse Effect.

Section 7.2. Compliance with Applicable Law and Material Contracts.

The Parent and the Borrower shall, and shall cause each Subsidiary and each other Loan Party to, comply with (a) all Applicable Laws, including the obtaining of all Governmental Approvals, the failure with which to comply could reasonably be expected to have a Material Adverse Effect, and (b) all terms and conditions of all Material Contracts to which it is a party. The Parent and the Borrower shall maintain in effect and enforce policies and procedures designed to ensure compliance by the Parent, the Borrower, their respective Subsidiaries and their and their respective Subsidiaries’ respective directors, officers, employees and agents with Anti-Corruption Laws, Anti-Terrorism Laws and applicable Sanctions.

Section 7.3. Maintenance of Property.

In addition to the requirements of any of the other Loan Documents, the Parent and the Borrower shall, and shall cause each Subsidiary and other Loan Party to, (a) protect and preserve all of its material

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properties, including, but not limited to, all Intellectual Property, and maintain in good repair, working order and condition all tangible properties, ordinary wear and tear excepted, and (b)  make or cause to be made all needed and appropriate repairs, renewals, replacements and additions to such properties, so that the business carried on in connection therewith may be properly and advantageously conducted at all times.

Section 7.4. Conduct of Business.

The Parent and the Borrower shall, and shall cause their Subsidiaries and the other Loan Parties to carry on, their respective businesses as described in Section 6.1.(u).

Section 7.5. Insurance.

In addition to the requirements of any of the other Loan Documents, the Parent and the Borrower shall, and shall cause each Subsidiary and other Loan Party to, maintain insurance (on a replacement cost basis) with financially sound and reputable insurance companies against such risks and in such amounts as is customarily maintained by Persons engaged in similar businesses or as may be required by Applicable Law, and from time to time deliver to the Administrative Agent upon its request a detailed list, together with copies of all policies of the insurance then in effect, stating the names of the insurance companies, the amounts and rates of the insurance, the dates of the expiration thereof and the properties and risks covered thereby.

Section 7.6. Payment of Taxes and Claims.

The Parent and the Borrower shall, and shall cause each Subsidiary and other Loan Party to, pay and discharge when due (a) all taxes, assessments and governmental charges or levies imposed upon it or upon its income or profits or upon any properties belonging to it, and (b) all lawful claims of materialmen, mechanics, carriers, warehousemen and landlords for labor, materials, supplies and rentals which, if unpaid, might become a Lien on any properties of such Person; provided, however, that this Section shall not require the payment or discharge of any such tax, assessment, charge, levy or claim which is being contested in good faith by appropriate proceedings which operate to suspend the collection thereof and for which adequate reserves have been established on the books of the Parent, the Borrower, such Subsidiary or such other Loan Party, as applicable, in accordance with GAAP.

Section 7.7. Visits and Inspections.

The Parent and the Borrower shall, and shall cause each Subsidiary and other Loan Party to, permit representatives or agents of any Lender or the Administrative Agent, from time to time after reasonable prior notice if no Event of Default shall be in existence, as often as may be reasonably requested, but only during normal business hours and at the expense of such Lender or the Administrative Agent (unless a Default or Event of Default shall exist, in which case the exercise by the Administrative Agent or such Lender of its rights under this Section shall be at the expense of the Borrower), as the case may be, to: (a) visit and inspect all properties of the Parent, the Borrower or such Subsidiary or other Loan Party to the extent any such right to visit or inspect is within the control of such Person; (b) inspect and make extracts from their respective books and records, including but not limited to management letters prepared by independent accountants; and (c) discuss with its officers and employees, and its independent accountants, its business, properties, condition (financial or otherwise), results of operations and performance. If requested by the Administrative Agent, the Parent shall execute an authorization letter addressed to its accountants authorizing the Administrative Agent or any Lender to discuss the financial affairs of the Parent and any Subsidiary or any other Loan Party with its accountants.

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Section 7.8. Use of Proceeds.

The Borrower shall use the proceeds of the Loans (a) to repay the Existing Term Loan on the Effective Date and (b) thereafter, for acquisitions, development and other general corporate purposes only. No part of the proceeds of any Loan will be used (i) for the purpose of buying or carrying “margin stock” within the meaning of Regulation U of the Board of Governors of the Federal Reserve System or (ii) to extend credit to others for the purpose of purchasing or carrying any such margin stock. The Borrower shall not, and shall not permit any other Loan Party or Subsidiary to, use any proceeds of any Loan directly or, to the knowledge of the Borrower, indirectly in any manner which would violate Anti-Corruption Laws, Anti-Terrorism Laws or applicable Sanctions.

Section 7.9. Environmental Matters.

The Parent shall, and shall cause all of its Subsidiaries and the other Loan Parties to, comply with all Environmental Laws the failure with which to comply could reasonably be expected to have a Material Adverse Effect. If the Parent, the Borrower, any Subsidiary or any other Loan Party shall (a) receive notice that any violation of any Environmental Law may have been committed or is about to be committed by such Person, (b) receive notice that any administrative or judicial complaint or order has been filed or is about to be filed against the Parent, the Borrower, any Subsidiary or any other Loan Party alleging violations of any Environmental Law or requiring the Parent, the Borrower, any Subsidiary or any other Loan Party to take any action in connection with the release of Hazardous Materials or (c) receive any notice from a Governmental Authority or private party alleging that the Parent, the Borrower, any Subsidiary or any other Loan Party may be liable or responsible for costs associated with a response to or cleanup of a release of Hazardous Materials or any damages caused thereby, and such notices, individually or in the aggregate, could reasonably be expected to have a Material Adverse Effect, the Borrower shall provide the Administrative Agent with a copy of such notice promptly, and in any event within 10 Business Days, after the receipt thereof by the Parent, the Borrower, any Subsidiary or any other Loan Party. The Parent shall, and shall cause its Subsidiaries and the other Loan Parties to, take promptly all actions necessary to prevent the imposition of any Liens on any of their respective properties arising out of or related to any Environmental Laws.

Section 7.10. Books and Records.

The Parent shall, and shall cause each of its Subsidiaries and the other Loan Parties to, maintain books and records pertaining to its respective business operations in such detail, form and scope as is consistent with good business practice and in accordance with GAAP.

Section 7.11. Further Assurances.

The Parent and the Borrower shall, at the Borrower’s cost and expense and upon request of the Administrative Agent, execute and deliver or cause to be executed and delivered, to the Administrative Agent such further instruments, documents and certificates, and do and cause to be done such further acts that may be reasonably necessary or advisable in the reasonable opinion of the Administrative Agent to carry out more effectively the provisions and purposes of this Agreement and the other Loan Documents.

Section 7.12. Guarantors.

(a)    Requirements to Become a Guarantor. During any time that the Borrower does not have an Investment Grade Rating, the Borrower shall cause each Material Subsidiary that has guaranteed, or otherwise

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become liable for, the Unsecured Indebtedness of another Person to deliver to the Administrative Agent an Accession Agreement executed by such Material Subsidiary and each of the items set forth in the immediately following subsection (b). The Borrower shall cause delivery of the Accession Agreement and the items described in the immediately following subsection (b) within 10 Business Days of any such Material Subsidiary guaranteeing, or otherwise becoming liable for, the Unsecured Indebtedness of another Person during any time that the Borrower does not have an Investment Grade Rating.

(b)    Required Deliverables. Each Accession Agreement delivered by a Material Subsidiary under the immediately preceding subsection (a) shall be accompanied by each of the following items:

(i)    the certificate or articles of incorporation, articles of organization, certificate of limited partnership, declaration of trust or other comparable organizational instrument (if any) of such Material Subsidiary, certified as of a recent date by the Secretary of State of the State of formation of such Material Subsidiary;

(ii)    a Certificate of Good Standing or certificate of similar meaning with respect to such Material Subsidiary (and in the case of a limited partnership, the general partner of such Material Subsidiary) issued as of a recent date by the Secretary of State of the State of formation of such Material Subsidiary and certificates of qualification to transact business or other comparable certificates issued by each Secretary of State (and any state department of taxation, as applicable) of each state in which such Material Subsidiary is required to be so qualified where failure to be so qualified could reasonably be expected to have a Material Adverse Effect;

(iii)    a certificate of incumbency signed by the Secretary or Assistant Secretary (or other individual performing similar functions) of such Material Subsidiary with respect to each of the officers of such Person authorized to execute and deliver the Loan Documents to which such Material Subsidiary is a party;

(iv)    copies certified by the Secretary or Assistant Secretary (or other individual performing similar functions) of such Material Subsidiary of the by-laws of such Person, if a corporation, the operating agreement, if a limited liability company, the partnership agreement, if a limited or general partnership, or other comparable document in the case of any other form of legal entity;

(v)    copies certified by the Secretary or Assistant Secretary (or other individual performing similar functions) of such Material Subsidiary of all corporate, partnership, member or other necessary action taken by such Material Subsidiary to authorize the execution, delivery and performance of the Loan Documents to which it is a party; and

(vi)    the items that would have been delivered under Sections 5.1.(a)(iv), (v) and (xiv) as if such Material Subsidiary had been a Guarantor on the Effective Date.

(c)    Release of a Guarantor. With respect to any Material Subsidiary that becomes a Guarantor pursuant to subsection (a) above, the Borrower may request in writing that the Administrative Agent release, and upon receipt of such request the Administrative Agent shall release, such Subsidiary from the Guaranty pursuant to a Guarantor Release Letter so long as: (i) either (A)(1) such Guarantor has ceased to be, or simultaneously with its release from the Guaranty will cease to be a Material Subsidiary; and (2) no Default or Event of Default exists or would occur as a result of such release; or (B) the Borrower has an Investment Grade Rating; and (ii) the Administrative Agent shall have received such written request at least 10 Business

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Days (or such shorter period as may be acceptable to the Administrative Agent) prior to the requested date of release. Delivery by the Borrower to the Administrative Agent of any such request shall constitute a representation by the Borrower that the matters set forth in the preceding sentence (both as of the date of the giving of such request and as of the date of the effectiveness of such request) are true and correct with respect to such request.

Section 7.13. REIT Status.

The Parent shall at all times maintain its status as a REIT.

Section 7.14. Exchange Listing.

The Parent shall maintain at least one class of common shares of the Parent having trading privileges on the New York Stock Exchange or NYSE MKT LLC or which is subject to price quotations on The NASDAQ Stock Market’s National Market System.

ARTICLE VIII. INFORMATION

For so long as this Agreement is in effect, the Parent and the Borrower, as applicable, shall furnish to the Administrative Agent for distribution to each of the Lenders:

Section 8.1. Quarterly Financial Statements.

As soon as available and in any event within 10 days after the same is required to be filed with the Securities and Exchange Commission (but in no event later than 45 days after the end of each of the first, second and third fiscal quarters of the Parent), the unaudited consolidated balance sheet of the Parent and its Subsidiaries as at the end of such period and the related unaudited consolidated statements of income, shareholders’ equity and cash flows of the Parent and its Subsidiaries for such period, setting forth in each case in comparative form the figures as of the end of and for the corresponding periods of the previous fiscal year, all of which shall be certified by the chief financial officer or the treasurer of the Parent, in his or her opinion, to present fairly, in accordance with GAAP and in all material respects, the consolidated financial position of the Parent and its Subsidiaries as at the date thereof and the results of operations for such period (subject to normal year‑end audit adjustments).

Section 8.2. Year‑End Statements.

As soon as available and in any event within 10 days after the same is required to be filed with the Securities and Exchange Commission (but in no event later than 90 days after the end of each fiscal year of the Parent), the audited consolidated balance sheet of the Parent and its Subsidiaries as at the end of such fiscal year and the related audited consolidated statements of income, shareholders’ equity and cash flows of the Parent and its Subsidiaries for such fiscal year, setting forth in comparative form the figures as at the end of and for the previous fiscal year, all of which shall be certified by (a) the chief financial officer or treasurer of the Parent, in his or her opinion, to present fairly, in accordance with GAAP, the consolidated financial position of the Parent and its Subsidiaries as at the date thereof and the results of operations for such period and (b) independent certified public accountants of recognized national standing, whose certificate shall be unqualified.

Section 8.3. Compliance Certificate.

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At the time financial statements are furnished pursuant to Sections 8.1. and 8.2., and within 5 Business Days of the Administrative Agent’s request with respect to any other fiscal period, a certificate substantially in the form of Exhibit G (a “Compliance Certificate”) executed by the chief financial officer or treasurer of the Parent: (a) setting forth in reasonable detail as at the end of such quarterly accounting period, fiscal year, or other fiscal period, as the case may be, the calculations required to establish whether or not the Parent and the Borrower were in compliance with the covenants contained in Sections 9.1. and (b) stating that, to the best of such Person’s knowledge, information and belief after due inquiry, no Default or Event of Default exists, or, if such is not the case, specifying such Default or Event of Default and its nature, when it occurred, whether it is continuing and the steps being taken by the Borrower with respect to such event, condition or failure. Together with each Compliance Certificate delivered in connection with quarterly or annual financial statements, the Borrower and the Parent shall deliver (a) a report, in form and detail reasonably satisfactory to the Administrative Agent, setting forth a Statement of Funds From Operations for the fiscal period then ending and (b) a complete and correct listing of all Indebtedness of the Parent and its Subsidiaries, including without limitation, Guarantees of the Parent and its Subsidiaries, and indicating whether such Indebtedness is Secured Indebtedness or Unsecured Indebtedness.

Section 8.4. Other Information.

(a)    Management Reports. Promptly upon receipt thereof, copies of all management reports, if any, submitted to the Parent or its respective Boards of Trustees by its independent public accountants;

(b)    Securities Filings. Within 5 Business Days of the filing thereof, copies of all registration statements (excluding the exhibits thereto (unless requested by the Administrative Agent) and any registration statements on Form S‑8 or its equivalent), reports on Forms 10‑K, 10‑Q and 8‑K (or their equivalents) and all other periodic or current reports which the Parent, the Borrower, any of their respective Subsidiaries or any other Loan Party shall file with the Securities and Exchange Commission (or any Governmental Authority substituted therefor) or any national securities exchange;

(c)    Shareholder Information. Promptly upon the mailing thereof to the shareholders of the Parent generally, copies of all financial statements, reports and proxy statements so mailed and promptly upon the issuance thereof copies of all press releases issued by the Parent, the Borrower, any Subsidiary or any other Loan Party;

(d)    ERISA. If any ERISA Event shall occur that individually, or together with any other ERISA Event that has occurred, could reasonably be expected to have a Material Adverse Effect, a certificate of the chief executive officer or chief financial officer, treasurer or controller of the Borrower or the Parent, as applicable, setting forth details as to such occurrence and the action, if any, which the Parent, the Borrower or applicable member of the ERISA Group is required or proposes to take;

(e)    Litigation. To the extent the Parent, the Borrower or any Subsidiary is aware of the same, prompt notice of the commencement of any proceeding or investigation by or before any Governmental Authority and any action or proceeding in any court or other tribunal or before any arbitrator against or in any other way relating adversely to, or adversely affecting, the Parent, the Borrower or any Subsidiary or any of their respective properties, assets or businesses which could reasonably be expected to have a Material Adverse Effect, and prompt notice of the receipt of notice that any United States income tax returns of the Parent, the Borrower or any Subsidiary are being audited;

(f)    [Intentionally Omitted];

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(g)    Change of Management or Financial Condition. Prompt notice of any change in the senior management of the Parent, the Borrower, any Subsidiary or any other Loan Party and any change in the business, assets, liabilities, financial condition, results of operations or business prospects of the Parent, the Borrower, any Subsidiary or any other Loan Party which has had or could reasonably be expected to have a Material Adverse Effect;

(h)    Default. Notice of the occurrence of any of the following promptly upon a Responsible Officer of the Parent or the Borrower obtaining knowledge thereof: (i) any Default or Event of Default or (ii) any event which constitutes or which with the passage of time, the giving of notice, or otherwise, would constitute a default or event of default by the Parent, the Borrower, any Subsidiary or any other Loan Party under any Material Contract to which any such Person is a party or by which any such Person or any of its respective properties may be bound;

(i)    Notice of Violations of Law. Prompt notice if the Parent, the Borrower, any Subsidiary or any other Loan Party shall receive any notification from any Governmental Authority alleging a violation of any Applicable Law or any inquiry which, in either case, could reasonably be expected to have a Material Adverse Effect;

(j)    Material Subsidiary. Prompt notice of any Person becoming a Material Subsidiary;

(k)    Material Asset Sales. Prompt notice of the sale, transfer or other disposition of, in one or a series of related transactions, assets constituting 10% or more of the Total Asset Value to any Person other than the Parent, the Borrower, any Subsidiary or any other Loan Party;

(l)    [Intentionally Omitted];

(m)    Patriot Act Information, Etc. From time to time and promptly upon each request, (i) information identifying the Borrower as a Lender may request in order to comply with the Patriot Act and (ii) any information that the Administrative Agent reasonably deems necessary from time to time in order to ensure compliance with all Applicable Laws concerning money laundering and similar activities; and

(n)    Other Information. From time to time and promptly upon each request, such data, certificates, reports, statements, opinions of counsel, documents or further information regarding the business, assets, liabilities, financial condition, results of operations or business prospects of the Parent, the Borrower or any of their respective Subsidiaries as the Administrative Agent or any Lender may reasonably request.

Notwithstanding anything to the contrary herein, documents and notices required to be delivered by the Loan Parties pursuant to subsections (b) and (c) of this Section shall be deemed delivered by, and delivery effective at the time of, the public filing of the same in electronic format with the Securities and Exchange Commission.

ARTICLE IX. NEGATIVE COVENANTS

For so long as this Agreement is in effect, unless the Requisite Lenders (or, if required pursuant to Section 12.6., all of the Lenders) shall otherwise consent in the manner set forth in Section 12.6., the Borrower and the Parent shall comply with the following covenants:

Section 9.1. Financial Covenants.

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Neither the Parent nor the Borrower shall permit:

(a)    Maximum Leverage Ratio. The ratio of (i) Total Indebtedness to (ii) Total Asset Value, to exceed 0.60 to 1.00 at any time.

For purposes of calculating this ratio, (A) Total Indebtedness shall be adjusted by deducting therefrom an amount equal to the lesser of (x) Total Indebtedness that by its terms is scheduled to mature on or before the date that is 24 months from the date of such calculation and (y) unrestricted cash and Cash Equivalents, and (B) Total Asset Value shall be adjusted by deducting therefrom the amount by which Total Indebtedness is adjusted under the immediately preceding clause (A).

(b)    Minimum Fixed Charge Coverage Ratio. The ratio of (i) Adjusted EBITDA of the Parent and its Subsidiaries determined on a consolidated basis for the fiscal quarter of the Parent most recently ending to (ii) Fixed Charges for such period, to be less than 1.50 to 1.00 at any time.

(c)    Maximum Secured Indebtedness Ratio. The ratio of (i) Secured Indebtedness of the Parent and its Subsidiaries determined on a consolidated basis to (ii) Total Asset Value, to exceed at any time 0.40 to 1.00

(d)    Unencumbered Leverage Ratio. The ratio of (i) Unsecured Indebtedness of the Parent and its Subsidiaries to (ii) Unencumbered Asset Value, to be greater than 0.60 to 1.00 at any time.

For purposes of calculating this ratio, (A) Unsecured Indebtedness shall be adjusted by deducting therefrom an amount equal to the lesser of (x) Unsecured Indebtedness that by its terms is scheduled to mature on or before the date that is 24 months from the date of calculation and (y) unrestricted cash and Cash Equivalents and (B) Unencumbered Asset Value shall be adjusted by deducting therefrom the amount by which Unsecured Indebtedness is adjusted under clause (A).

(e)    Minimum Unencumbered Interest Coverage Ratio. The ratio of (i) Unencumbered Adjusted NOI for the fiscal quarter of the Parent most recently ending to (ii) Unsecured Interest Expense for such period, to be less than 1.75 to 1.00 at any time.

(f)    Minimum Net Worth. Tangible Net Worth at any time to be less than (i) $1,300,000,000 plus (ii) 75% of the Net Proceeds of all Equity Issuances effected by the Parent or any Subsidiary after the Agreement Date (as defined in the Existing Credit Agreement).

Section 9.2. Restricted Payments.

If a Default or Event of Default exists, the Parent shall not, and shall not permit any of its Subsidiaries to, declare or make any Restricted Payment except (a) to the Parent or any Subsidiary and (b) the Borrower may pay cash dividends to the Parent and other holders of partnership interests in the Borrower on a pro rata basis with respect to any fiscal year ending during the term of this Agreement to the extent necessary for the Parent to distribute, and the Parent may so distribute, cash dividends to its shareholders in an aggregate amount not to exceed the minimum amount necessary for the Parent to remain in compliance with Section 7.13. If a Default or Event of Default specified in Section 10.1.(a), Section 10.1.(b), Section 10.1.(f) or Section 10.1.(g) shall exist, or if as a result of the occurrence of any other Event of Default any of the Obligations have been accelerated pursuant to Section 10.2.(a), the Parent shall not, and shall not permit any Subsidiary to, make any Restricted Payments to any Person other than to the Parent or any Subsidiary.

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Section 9.3. Indebtedness.

The Parent and the Borrower shall not, and shall not permit any Subsidiary or any other Loan Party to, incur, assume, or otherwise become obligated in respect of any Indebtedness after the Agreement Date if immediately prior to the assumption, incurring or becoming obligated in respect thereof, or immediately thereafter and after giving effect thereto, a Default or Event of Default is or would be in existence, including without limitation, a Default or Event of Default resulting from a violation of any of the covenants contained in Section 9.1.

Section 9.4. Liens; Negative Pledges; Other Matters.

(a)    The Parent and the Borrower shall not, and shall not permit any Subsidiary or other Loan Party to, create, assume, or incur any Lien (other than Permitted Liens) upon any of its properties, assets, income or profits of any character whether now owned or hereafter acquired if immediately prior to the creation, assumption or incurring of such Lien, or immediately thereafter, a Default or Event of Default is or would be in existence, including without limitation, a Default or Event of Default resulting from a violation of any of the covenants contained in Section 9.1. Notwithstanding anything to the contrary in this Section, if the Parent, the Borrower or any other Subsidiary grants a Lien in any of its respective properties, assets, income or profits to secure the Existing Credit Agreement liabilities and/or the liabilities and obligations under any other agreement evidencing Unsecured Indebtedness that the Parent, the Borrower, any other Loan Party or any Subsidiary may create, incur, assume or permit to suffer to exist under Section 9.3., then the Borrower or the applicable Subsidiary will make or cause to be made a provision whereby the Obligations will be secured equally and ratably with all other obligations secured by such Lien, and in any case the Administrative Agent and the Lenders shall have the benefit, to the full extent that and with such priority as, the Administrative Agent and the Lenders may be entitled under Applicable Law, of an equitable Lien on such properties, assets, income or profits securing the Obligations.

(b)    The Parent and the Borrower shall not, and shall not permit any Subsidiary or other Loan Party to, create or otherwise cause or suffer to exist or become effective any consensual encumbrance or restriction of any kind on the ability of any Subsidiary (other than an Excluded Subsidiary) to: (i) pay dividends or make any other distribution on any of such Subsidiary’s capital stock or other equity interests owned by the Parent or any Subsidiary; (ii) pay any Indebtedness owed to the Parent or any Subsidiary; (iii) make loans or advances to the Parent or any Subsidiary; or (iv) transfer any of its property or assets to the Parent or any Subsidiary; other than (i) with respect to clauses (i) through (iv), those encumbrances or restrictions (A) contained in any Loan Document, (B) contained in any other agreement that evidences Unsecured Indebtedness containing encumbrances or restrictions on the actions described above that are substantially similar to those contained in the Loan Documents, or, (ii) with respect to clause (iv), customary provisions restricting assignment of any agreement entered into by the Borrower, any other Loan Party or any Subsidiary in the ordinary course of business.

Section 9.5. Merger, Consolidation, Sales of Assets and Other Arrangements.

The Parent and the Borrower shall not, and shall not permit any Subsidiary or other Loan Party to: (i) enter into any transaction of merger or consolidation; (ii) liquidate, wind up or dissolve itself (or suffer any liquidation or dissolution); or (iii) convey, sell, lease, sublease, transfer or otherwise dispose of, in one transaction or a series of transactions, all or any substantial part of its business or assets, whether now owned or hereafter acquired; provided, however, that:

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(a)    any of the actions described in the immediately preceding clauses (i) through (iii) may be taken with respect to any Subsidiary or any other Loan Party (other than the Parent or the Borrower) so long as immediately prior to the taking of such action, and immediately thereafter and after giving effect thereto, no Default or Event of Default is or would be in existence; notwithstanding the foregoing, any such Loan Party (other than the Borrower) may enter into a transaction of merger pursuant to which such Loan Party is not the survivor of such merger only if (i) the Borrower shall have given the Administrative Agent and the Lenders at least 30 Business Days’ prior written notice of such merger, such notice to include a certification to the effect that immediately after and after giving effect to such action, no Default or Event of Default is or would be in existence; (ii) within 5 Business Days of consummation of such merger, the survivor entity (if not already a Guarantor) shall have executed and delivered an assumption agreement in form and substance satisfactory to the Administrative Agent pursuant to which such survivor entity shall expressly assume all of the such Loan Party’s Obligations under the Loan Documents to which it is a party; (iii) within 30 days of consummation of such merger, the survivor entity delivers to the Administrative Agent the following: (A) items of the types referred to in Section 7.12.(b) with respect to the survivor entity as in effect after consummation of such merger (if not previously delivered to the Administrative Agent and still in effect), (B) copies of all documents entered into by such Loan Party or the survivor entity to effectuate the consummation of such merger, including, but not limited to, articles of merger and the plan of merger, (C) copies, certified by the Secretary or Assistant Secretary (or other individual performing similar functions) of such Loan Party or the survivor entity, of all corporate and shareholder action authorizing such merger and (D) copies of any filings with the Securities and Exchange Commission in connection with such merger; and (iv) such Loan Party and the survivor entity each takes such other action and delivers such other documents, instruments, opinions and agreements as the Administrative Agent may reasonably request;

(b)    the Parent, the Borrower, the Subsidiaries and the other Loan Parties may lease and sublease their respective assets, as lessor or sublessor (as the case may be), in the ordinary course of their business;

(c)    a Person may merge with and into the Borrower or the Parent so long as (i) the Borrower or the Parent, as the case may be, is the survivor of such merger, (ii) immediately prior to such merger, and immediately thereafter and after giving effect thereto, no Default or Event of Default is or would be in existence, (iii) the Borrower shall have given the Administrative Agent and the Lenders at least 30 Business Days’ prior written notice of such merger, such notice to include a certification as to the matters described in the immediately preceding clause (ii) (except that in the case of the merger of a Subsidiary with and into the Borrower or the Parent such notice may be given no later 5 Business Days following the consummation of such merger); and

(d)    the Parent, the Borrower and each Subsidiary may sell, transfer or dispose of assets among themselves.

Section 9.6. Fiscal Year.

Neither the Parent nor the Borrower shall change its fiscal year from that in effect as of the Agreement Date.

Section 9.7. [Intentionally Omitted].

Section 9.8. Modifications of Organizational Documents.

The Parent and the Borrower shall not, and shall not permit any Loan Party or other Subsidiary to, amend, supplement, restate or otherwise modify its articles or certificate of incorporation, by-laws, operating

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agreement, declaration of trust, partnership agreement or other applicable organizational document if such amendment, supplement, restatement or other modification could reasonably be expected to have a Material Adverse Effect.

Section 9.9. Transactions with Affiliates.

The Parent and the Borrower shall not, and shall not permit any Subsidiary or any other Loan Party to, permit to exist or enter into, any transaction (including the purchase, sale, lease or exchange of any property or the rendering of any service) with any Affiliate, except transactions in the ordinary course of and pursuant to the reasonable requirements of the business of the Parent or any of its Subsidiaries and upon fair and reasonable terms which are no less favorable to the Parent or such Subsidiary than would be obtained in a comparable arm’s length transaction with a Person that is not an Affiliate.

Section 9.10. ERISA Exemptions.

Neither the Parent nor the Borrower shall, or shall permit any Subsidiary to, permit any of its respective assets to become or be deemed to be “plan assets” within the meaning of ERISA, the Internal Revenue Code and the respective regulations promulgated thereunder. Neither the Parent nor the Borrower shall cause or permit to occur, or permit any other member of the ERISA Group to cause or permit to occur, any ERISA Event if such ERISA Event could reasonably be expected to have a Material Adverse Effect.

Section 9.11. Foreign Assets Control.

The Borrower and each Guarantor shall not be at any time a Person with whom the Administrative Agent and the Lenders are restricted from doing business under the regulations of OFAC (including, Sanctioned Persons) or under any statute, executive order (including, the September 24, 2001 Executive Order Blocking Property and Prohibiting Transactions With Persons Who Commit, Threaten to Commit, or Support Terrorism), or other governmental action and shall not engage in any dealings or transactions or otherwise be associated with such Persons.

ARTICLE X. DEFAULT

Section 10.1. Events of Default.

Each of the following shall constitute an Event of Default, whatever the reason for such event and whether it shall be voluntary or involuntary or be effected by operation of Applicable Law or pursuant to any judgment or order of any Governmental Authority:

(a)    Default in Payment of Principal. The Borrower shall fail to pay when due (whether upon demand, at maturity, by reason of acceleration or otherwise) the principal of any of the Loans, or any Reimbursement Obligation.

(b)    Default in Payment of Interest and Other Obligations. The Borrower shall fail to pay when due any interest on any of the Loans or any of the other payment Obligations owing by the Borrower under this Agreement or any other Loan Document, or any other Loan Party shall fail to pay when due any payment Obligation owing by such other Loan Party under any Loan Document to which it is a party, and such failure shall continue for a period of 5 Business Days.

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(c)    Default in Performance. (i) The Parent or the Borrower shall fail to perform or observe any term, covenant, condition or agreement contained in Section 8.4.(h) or in Article IX. or (ii) the Borrower or any other Loan Party shall fail to perform or observe any term, covenant, condition or agreement contained in this Agreement or any other Loan Document to which it is a party and not otherwise mentioned in this Section and in the case of this clause (ii) only such failure shall continue for a period of 30 days after the earlier of (x) the date upon which a Responsible Officer of the Borrower or such Loan Party obtains knowledge of such failure or (y) the date upon which the Borrower has received written notice of such failure from the Administrative Agent.

(d)    Misrepresentations. Any written statement, representation or warranty made or deemed made by or on behalf of the Parent, the Borrower or any other Loan Party under this Agreement or under any other Loan Document, or any amendment hereto or thereto, or in any other writing or statement at any time furnished or made or deemed made by or on behalf of the Borrower or any other Loan Party to the Administrative Agent or any Lender, shall at any time prove to have been incorrect or misleading, in light of the circumstances in which made or deemed made, in any material respect when furnished or made or deemed made.

(e)    Indebtedness Cross-Default; Derivatives Contracts.

(i)    The Parent, the Borrower or any Subsidiary or any other Loan Party shall fail to pay when due and payable the principal of, or interest on, any Recourse Indebtedness (other than the Loans) having an aggregate outstanding principal amount of $50,000,000 or more individually or in the aggregate with all other Recourse Indebtedness as to which such a failure exists (“Material Indebtedness”) and as a result, the holder or holders of such Material Indebtedness, any trustee or agent acting on behalf of such holder or holders or any other Person, is permitted to accelerate the maturity of any such Material Indebtedness or require any such Material Indebtedness to be prepaid or repurchased prior to its stated maturity; or

(ii)    (x) the maturity of any Material Indebtedness shall have been accelerated in accordance with the provisions of any indenture, contract or instrument evidencing, providing for the creation of or otherwise concerning such Material Indebtedness or (y) any Material Indebtedness shall have been required to be prepaid, repurchased, redeemed or defeased prior to the stated maturity thereof; or

(iii)    any other event shall have occurred and be continuing with respect to any Material Indebtedness and as a result, the holder or holders of Material Indebtedness, any trustee or agent acting on behalf of such holder or holders or any other Person, is permitted to accelerate the maturity of any such Material Indebtedness or require any such Material Indebtedness to be prepaid or repurchased prior to its stated maturity; or

(iv)    there occurs under any Derivatives Contract an Early Termination Date (as defined in such Derivatives Contract) resulting from (A) any event of default under such Derivatives Contract as to which any Loan Party is the Defaulting Party (as defined in such Derivatives Contract) or (B) any Termination Event (as so defined) under such Derivatives Contract as to which any Loan Party is an Affected Party (as so defined) and, in either event, the Derivatives Termination Value owed by any Loan Party as a result thereof is $50,000,000 or more.

(f)    Voluntary Bankruptcy Proceeding. The Parent, the Borrower, any other Loan Party or any Material Subsidiary shall: (i) commence a voluntary case under the Bankruptcy Code of 1978, as amended,

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or other federal bankruptcy laws (as now or hereafter in effect); (ii) file a petition seeking to take advantage of any other Applicable Laws, domestic or foreign, relating to bankruptcy, insolvency, reorganization, winding‑up, or composition or adjustment of debts; (iii) consent to, or fail to contest in a timely and appropriate manner, any petition filed against it in an involuntary case under such bankruptcy laws or other Applicable Laws or consent to any proceeding or action described in the immediately following subsection; (iv) apply for or consent to, or fail to contest in a timely and appropriate manner, the appointment of, or the taking of possession by, a receiver, custodian, trustee, or liquidator of itself or of a substantial part of its property, domestic or foreign; (v) admit in writing its inability to pay its debts as they become due; (vi) make a general assignment for the benefit of creditors; (vii) make a conveyance fraudulent as to creditors under any Applicable Law; or (viii) take any corporate or partnership action for the purpose of effecting any of the foregoing.

(g)    Involuntary Bankruptcy Proceeding. A case or other proceeding shall be commenced against the Parent, the Borrower, any other Loan Party or any Material Subsidiary of the Parent or the Borrower in any court of competent jurisdiction seeking: (i) relief under the Bankruptcy Code of 1978, as amended, or other federal bankruptcy laws (as now or hereafter in effect) or under any other Applicable Laws, domestic or foreign, relating to bankruptcy, insolvency, reorganization, winding‑up, or composition or adjustment of debts; or (ii) the appointment of a trustee, receiver, custodian, liquidator or the like of such Person, or of all or any substantial part of the assets, domestic or foreign, of such Person, and such case or proceeding shall continue undismissed or unstayed for a period of 60 consecutive calendar days, or an order granting the remedy or other relief requested in such case or proceeding against the Parent, the Borrower, such Subsidiary or such other Loan Party (including, but not limited to, an order for relief under such Bankruptcy Code or such other federal bankruptcy laws) shall be entered.

(h)    Litigation; Enforceability. The Parent, the Borrower, any Subsidiary or any other Loan Party shall disavow, revoke or terminate (or attempt to terminate) any Loan Document to which it is a party or shall otherwise challenge or contest in any action, suit or proceeding in any court or before any Governmental Authority the validity or enforceability of this Agreement, any Note or any other Loan Document or this Agreement, any Note, the Guaranty or any other Loan Document shall cease to be in full force and effect (except as a result of the express terms thereof).

(i)    Judgment. A judgment or order for the payment of money or for an injunction shall be entered against the Parent, the Borrower, any Subsidiary or any other Loan Party, by any court or other tribunal and (i) such judgment or order shall continue for a period of 30 days without being paid, stayed or dismissed through appropriate appellate proceedings and (ii) either (A) the amount of such judgment or order for which insurance has not been acknowledged in writing by the applicable insurance carrier (or the amount as to which the insurer has denied liability) exceeds, individually or together with all other such outstanding judgments or orders $50,000,000 or (B) in the case of an injunction or other non-monetary judgment, such judgment could reasonably be expected to have a Material Adverse Effect.

(j)    Attachment. A warrant, writ of attachment, execution or similar process shall be issued against any property of the Parent, the Borrower, any Subsidiary of the Parent or the Borrower or any other Loan Party which exceeds, individually or together with all other such warrants, writs, executions and processes, $50,000,000 in amount and such warrant, writ, execution or process shall not be discharged, vacated, stayed or bonded for a period of 30 days; provided, however, that if a bond has been issued in favor of the claimant or other Person obtaining such warrant, writ, execution or process, the issuer of such bond shall execute a waiver or subordination agreement in form and substance satisfactory to the Administrative Agent pursuant to which the issuer of such bond subordinates its right of reimbursement, contribution or

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subrogation to the Obligations and waives or subordinates any Lien it may have on the assets of any Loan Party.

(k)    ERISA.

(i)    One or more ERISA Events shall have occurred that result in liability to any member of the ERISA Group aggregating in excess of $25,000,000; or

(ii)    The “benefit obligation” of all Plans exceeds the “fair market value of plan assets” for such Plans by more than $25,000,000, all as determined, and with such terms defined, in accordance with FASB ASC 715.

(l)    Loan Documents. An Event of Default (as defined therein) shall occur under any of the other Loan Documents.

(m)    Change of Control.

(i)    Any “person” or “group” (as such terms are used in Sections 13(d) and 14(d) of the Securities Exchange Act of 1934, as amended (the “Exchange Act”)), is or becomes the “beneficial owner” (as defined in Rules 13d-3 and 13d-5 under the Exchange Act, except that a Person will be deemed to have “beneficial ownership” of all securities that such Person has the right to acquire, whether such right is exercisable immediately or only after the passage of time), directly or indirectly, of more than 25% of the total voting power of the then outstanding voting stock of the Parent;

(ii)    During any period of 12 consecutive months ending after the Agreement Date, individuals who at the beginning of any such 12‑month period constituted the Board of Trustees of the Parent (together with any new trustees whose election by such Board or whose nomination for election by the shareholders of the Parent was approved by a vote of a majority of the trustees then still in office who were either directors at the beginning of such period or whose election or nomination for election was previously so approved) cease for any reason to constitute a majority of the Board of Trustees of the Parent then in office; or

(iii)    the Parent, or any Wholly Owned Subsidiary of the Parent, shall cease for any reason to be the general partner of the Borrower.

(n)    Existing Credit Agreement. An Event of Default under (and as defined in) the Existing Credit Agreement shall occur.

Section 10.2. Remedies Upon Event of Default.

Upon the occurrence of an Event of Default the following provisions shall apply:

(a)    Acceleration; Termination of Facilities.

(i)    Automatic. Upon the occurrence of an Event of Default specified in Sections 10.1.(f) or 10.1.(g), (A)(i) the principal of, and all accrued interest on, the Loans and the Notes at the time outstanding and (ii) all of the other Obligations of the Borrower, including, but not limited to, the other amounts owed to the Lenders and the Administrative Agent under this Agreement, the Notes or any of the other Loan Documents shall become immediately and automatically due and

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payable by the Borrower without presentment, demand, protest, or other notice of any kind, all of which are expressly waived by the Borrower and (B) all of the Commitments and the obligation of the Lenders to make Loans shall all immediately and automatically terminate.

(ii)    Optional. If any other Event of Default shall exist, the Administrative Agent shall, at the direction of the Requisite Lenders: (A) declare (1) the principal of, and accrued interest on, the Loans and the Notes at the time outstanding, and (2) all of the other Obligations, including, but not limited to, the other amounts owed to the Lenders and the Administrative Agent under this Agreement, the Notes or any of the other Loan Documents to be forthwith due and payable, whereupon the same shall immediately become due and payable without presentment, demand, protest or other notice of any kind, all of which are expressly waived by the Borrower and (B) terminate the Commitments.

(b)    Loan Documents. The Requisite Lenders may direct the Administrative Agent to, and the Administrative Agent if so directed shall, exercise any and all of its rights under any and all of the other Loan Documents.

(c)    Applicable Law. The Requisite Lenders may direct the Administrative Agent to, and the Administrative Agent if so directed shall, exercise all other rights and remedies it may have under any Applicable Law.

(d)    Appointment of Receiver. To the extent permitted by Applicable Law, the Administrative Agent and the Lenders shall be entitled to the appointment of a receiver for the assets and properties of the Parent, the Borrower and their respective Subsidiaries, without notice of any kind whatsoever and without regard to the adequacy of any security for the Obligations or the solvency of any party bound for its payment, to take possession of all or any portion of the business operations of the Parent, the Borrower and their respective Subsidiaries and to exercise such power as the court shall confer upon such receiver.

Section 10.3. Remedies Upon Default.

Upon the occurrence of a Default specified in Sections 10.1.(g), the Commitments shall immediately and automatically terminate.

Section 10.4. Allocation of Proceeds.

If an Event of Default exists, all payments received by the Administrative Agent (or any Lender as a result of its exercise of remedies permitted under Section 12.3.) under any of the Loan Documents in respect of any Obligations shall be applied in the following order and priority:

(a)    to payment of that portion of the Obligations constituting fees, indemnities, expenses and other amounts, including attorney fees, payable to the Administrative Agent in its capacity as such;

(b)    to payment of that portion of the Obligations constituting fees, indemnities and other amounts (other than principal and interest) payable to the Lenders under the Loan Documents, including attorney fees, ratably among the Lenders in proportion to the respective amounts described in this clause (b) payable to them;

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(c)    to payment of that portion of the Obligations constituting accrued and unpaid interest on the Loans, ratably among the Lenders in proportion to the respective amounts described in this clause (c) payable to them;

(d)    to payment of that portion of the Obligations constituting unpaid principal of the Loans, ratably among the Lenders in proportion to the respective amounts described in this clause (d) payable to them; and

(e)    the balance, if any, after all of the Obligations have been indefeasibly paid in full, to the Borrower or as otherwise required by Applicable Law.

Section 10.5. Performance by Administrative Agent.

If the Parent or the Borrower shall fail to perform any covenant, duty or agreement contained in any of the Loan Documents, and such failure has continued after the expiration of any cure or grace period set forth herein, the Administrative Agent may, after notice to the Parent or the Borrower, perform or attempt to perform such covenant, duty or agreement on behalf of the Parent or the Borrower. In such event, the Borrower shall, at the request of the Administrative Agent, promptly pay any amount reasonably expended by the Administrative Agent in such performance or attempted performance to the Administrative Agent, together with interest thereon at the applicable Post‑Default Rate from the date of such expenditure until paid. Notwithstanding the foregoing, neither the Administrative Agent nor any Lender shall have any liability or responsibility whatsoever for the performance of any obligation of the Borrower under this Agreement or any other Loan Document.

Section 10.6. Rights Cumulative.

(a)    Generally. The rights and remedies of the Administrative Agent and the Lenders under this Agreement and each of the other Loan Documents shall be cumulative and not exclusive of any rights or remedies which any of them may otherwise have under Applicable Law. In exercising their respective rights and remedies the Administrative Agent and the Lenders may be selective and no failure or delay by the Administrative Agent or any of the Lenders in exercising any right shall operate as a waiver of it, nor shall any single or partial exercise of any power or right preclude its other or further exercise or the exercise of any other power or right.

(b)    Enforcement by Administrative Agent. Notwithstanding anything to the contrary contained herein or in any other Loan Document, the authority to enforce rights and remedies hereunder and under the other Loan Documents against the Loan Parties or any of them shall be vested exclusively in, and all actions and proceedings at law in connection with such enforcement shall be instituted and maintained exclusively by, the Administrative Agent in accordance with Article X. for its benefit and the benefit of all the Lenders; provided that the foregoing shall not prohibit (i) the Administrative Agent from exercising on its own behalf the rights and remedies that inure to its benefit (solely in its capacity as Administrative Agent) hereunder and under the other Loan Documents, (ii) any Lender from exercising setoff rights in accordance with Section 12.3. (subject to the terms of Section 3.3.), or (iii) any Lender from filing proofs of claim or appearing and filing pleadings on its own behalf during the pendency of a proceeding relative to any Loan Party under any Debtor Relief Law; and provided, further, that if at any time there is no Person acting as Administrative Agent hereunder and under the other Loan Documents, then (x) the Requisite Lenders shall have the rights otherwise ascribed to the Administrative Agent pursuant to Article X. and (y) in addition to the matters set forth in clauses (ii) and (iii) of the preceding proviso and subject to Section 3.3., any Lender may, with the

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consent of the Requisite Lenders, enforce any rights and remedies available to it and as authorized by the Requisite Lenders.

ARTICLE XI. THE ADMINISTRATIVE AGENT

Section 11.1. Authorization and Action.

Each Lender hereby appoints and authorizes the Administrative Agent to take such action as contractual representative on such Lender’s behalf and to exercise such powers under this Agreement and the other Loan Documents as are specifically delegated to the Administrative Agent by the terms hereof and thereof, together with such powers as are reasonably incidental thereto. Not in limitation of the foregoing, each Lender authorizes and directs the Administrative Agent to enter into the Loan Documents for the benefit of the Lenders. Each Lender hereby agrees that, except as otherwise set forth herein, any action taken by the Requisite Lenders in accordance with the provisions of this Agreement or the Loan Documents, and the exercise by the Requisite Lenders of the powers set forth herein or therein, together with such other powers as are reasonably incidental thereto, shall be authorized and binding upon all of the Lenders. Nothing herein shall be construed to deem the Administrative Agent a trustee or fiduciary for any Lender nor to impose on the Administrative Agent duties or obligations other than those expressly provided for herein. At the request of a Lender, the Administrative Agent will forward to such Lender copies or, where appropriate, originals of the documents delivered to the Administrative Agent pursuant to this Agreement or the other Loan Documents. The Administrative Agent will also furnish to any Lender, upon the request of such Lender, a copy of any certificate or notice furnished to the Administrative Agent by the Borrower, any Loan Party or any other Affiliate of the Borrower, pursuant to this Agreement or any other Loan Document not already delivered to such Lender pursuant to the terms of this Agreement or any such other Loan Document. As to any matters not expressly provided for by the Loan Documents (including, without limitation, enforcement or collection of any of the Obligations), the Administrative Agent shall not be required to exercise any discretion or take any action, but shall be required to act or to refrain from acting (and shall be fully protected in so acting or refraining from acting) upon the instructions of the Requisite Lenders (or all of the Lenders if explicitly required under any other provision of this Agreement), and such instructions shall be binding upon all Lenders and all holders of any of the Obligations; provided, however, that, notwithstanding anything in this Agreement to the contrary, the Administrative Agent shall not be required to take any action which exposes the Administrative Agent to personal liability or which is contrary to this Agreement or any other Loan Document or Applicable Law. Not in limitation of the foregoing, the Administrative Agent shall not exercise any right or remedy it or the Lenders may have under any Loan Document upon the occurrence of a Default or an Event of Default unless the Requisite Lenders have so directed the Administrative Agent to exercise such right or remedy.

Section 11.2. Administrative Agent’s Reliance, Etc.

Notwithstanding any other provisions of this Agreement or any other Loan Documents, neither the Administrative Agent nor any of its directors, officers, agents, employees or counsel shall be liable for any action taken or omitted to be taken by it or them under or in connection with this Agreement or any other Loan Document, except for its or their own gross negligence or willful misconduct as determined by a court of competent jurisdiction in a final, non-appealable judgment. Without limiting the generality of the foregoing, the Administrative Agent: (a) may treat the payee of any Note as the holder thereof until the Administrative Agent receives written notice of the assignment or transfer thereof signed by such payee and in form satisfactory to the Administrative Agent; (b) may consult with legal counsel (including its own counsel or counsel for the Borrower or any other Loan Party), independent public accountants and other experts selected by it and shall not be liable for any action taken or omitted to be taken in good faith by it

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in accordance with the advice of such counsel, accountants or experts; (c) makes no warranty or representation to any Lender or any other Person and shall not be responsible to any Lender or any other Person for any statements, warranties or representations made by any Person in or in connection with this Agreement or any other Loan Document; (d) shall not have any duty to ascertain or to inquire as to the performance or observance of any of the terms, covenants or conditions of any of this Agreement or any other Loan Document or the satisfaction of any conditions precedent under this Agreement or any Loan Document on the part of the Borrower or other Persons or inspect the property, books or records of the Borrower or any other Person; (e) shall not be responsible to any Lender for the due execution, legality, validity, enforceability, genuineness, sufficiency or value of this Agreement or any other Loan Document, any other instrument or document furnished pursuant thereto or any collateral covered thereby or the perfection or priority of any Lien in favor of the Administrative Agent on behalf of the Lenders in any such collateral; and (f) shall incur no liability under or in respect of this Agreement or any other Loan Document by acting upon any notice, consent, certificate or other instrument or writing (which may be by telephone or telecopy) believed by it to be genuine and signed, sent or given by the proper party or parties.

Section 11.3. Notice of Defaults.

The Administrative Agent shall not be deemed to have knowledge or notice of the occurrence of a Default or Event of Default unless the Administrative Agent has received notice from a Lender, the Parent or the Borrower referring to this Agreement, describing with reasonable specificity such Default or Event of Default and stating that such notice is a “notice of default.” If any Lender (excluding the Lender which is also serving as the Administrative Agent) becomes aware of any Default or Event of Default, it shall promptly send to the Administrative Agent such a “notice of default.” Further, if the Administrative Agent receives such a “notice of default”, the Administrative Agent shall give prompt notice thereof to the Lenders.

Section 11.4. Administrative Agent as Lender.

The Lender acting as Administrative Agent shall have the same rights and powers under this Agreement and any other Loan Document as any other Lender and may exercise the same as though it were not the Administrative Agent; and the term “Lender” or “Lenders” shall, unless otherwise expressly indicated, include Capital One in each case in its individual capacity. Capital One and its Affiliates may each accept deposits from, maintain deposits or credit balances for, invest in, lend money to, act as trustee under indentures of, serve as financial advisor to, and generally engage in any kind of business with, the Parent, the Borrower, any other Loan Party or any other Affiliate thereof as if it were any other bank and without any duty to account therefor to the other Lenders. Further, the Administrative Agent and any Affiliate of the Administrative Agent may accept fees and other consideration from the Parent or the Borrower for services in connection with this Agreement and otherwise without having to account for the same to the other Lenders. The Lenders acknowledge that, pursuant to such activities, Capital One or its Affiliates may receive information regarding the Parent, the Borrower, other Loan Parties, other Subsidiaries and other Affiliates (including information that may be subject to confidentiality obligations in favor of such Person) and acknowledge that the Administrative Agent shall be under no obligation to provide such information to them.

Section 11.5. Approvals of Lenders.

All communications from the Administrative Agent to any Lender requesting such Lender’s determination, consent or approval (a) shall be given in the form of a written notice to such Lender, (b) shall be accompanied by a description of the matter or issue as to which such determination, approval or consent is requested, or shall advise such Lender where information, if any, regarding such matter or issue may be inspected, or shall otherwise describe the matter or issue to be resolved, and (c) shall include, if reasonably

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requested by such Lender and to the extent not previously provided to such Lender, written materials and a summary of all oral information provided to the Administrative Agent by the Parent and the Borrower in respect of the matter or issue to be resolved. Each Lender shall reply promptly, but in any event within 10 Business Days (or such lesser or greater period as may be specifically required under the Loan Documents) of receipt of such communication. Unless a Lender shall give written notice to the Administrative Agent that it specifically objects to the recommendation or determination of the Administrative Agent (together with a written explanation of the reasons behind such objection) within the applicable time period for reply (which shall be no less than 10 Business Days), such Lender shall be deemed to have conclusively approved such requested determination, consent or approval. The provisions of this Section shall not apply to any amendment, waiver or consent regarding any of the matters described in Section 12.6.(b).

Section 11.6. Lender Credit Decision, Etc.

Each Lender expressly acknowledges and agrees that neither the Administrative Agent nor any of its officers, directors, employees, agents, counsel, attorneys‑in‑fact or other Affiliates of the Administrative Agent has made any representations or warranties as to the financial condition, operations, creditworthiness, solvency or other information concerning the business or affairs of the Borrower, any other Loan Party, any Subsidiary or any other Person to such Lender and that no act by the Administrative Agent hereafter taken, including any review of the affairs of the Parent, the Borrower, any other Loan Party or any other Subsidiary of the Parent or the Borrower, shall be deemed to constitute any such representation or warranty by the Administrative Agent to any Lender. Each Lender acknowledges that it has made its own credit and legal analysis and decision to enter into this Agreement and the transactions contemplated hereby, independently and without reliance upon the Administrative Agent, any other Lender or counsel to the Administrative Agent, or any of their respective officers, directors, employees and agents, and based on the financial statements of the Parent, the Borrower, the Subsidiaries or any other Affiliate thereof, and inquiries of such Persons, its independent due diligence of the business and affairs of the Borrower, the Loan Parties, the Subsidiaries of the Parent and the Borrower and other Persons, its review of the Loan Documents, the legal opinions required to be delivered to it hereunder, the advice of its own counsel and such other documents and information as it has deemed appropriate. Each Lender also acknowledges that it will, independently and without reliance upon the Administrative Agent, any other Lender or counsel to the Administrative Agent or any of their respective officers, directors, employees and agents, and based on such review, advice, documents and information as it shall deem appropriate at the time, continue to make its own decisions in taking or not taking action under the Loan Documents. Except for notices, reports and other documents and information expressly required to be furnished to the Lenders by the Administrative Agent under this Agreement or any of the other Loan Documents, the Administrative Agent shall have no duty or responsibility to provide any Lender with any credit or other information concerning the business, operations, property, financial and other condition or creditworthiness of the Borrower, any other Loan Party or any other Affiliate thereof which may come into possession of the Administrative Agent, or any of its officers, directors, employees, agents, attorneys‑in‑fact or other Affiliates. Each Lender acknowledges that the Administrative Agent’s legal counsel in connection with the transactions contemplated by this Agreement is only acting as counsel to the Administrative Agent and is not acting as counsel to such Lender.

Section 11.7. Indemnification of Administrative Agent.

Each Lender agrees to indemnify the Administrative Agent (to the extent not reimbursed by the Borrower and without limiting the obligation of the Borrower to do so) pro rata in accordance with such Lender’s Pro Rata Share (determined as of the time that the applicable unreimbursed expense or indemnity payment is sought), from and against any and all liabilities, obligations, losses, damages, penalties, actions, judgments, suits, costs, expenses or disbursements of any kind or nature whatsoever which may at any time

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be imposed on, incurred by, or asserted against the Administrative Agent (in its capacity as Administrative Agent but not as a Lender) in any way relating to or arising out of the Loan Documents, any transaction contemplated hereby or thereby or any action taken or omitted by the Administrative Agent under the Loan Documents (collectively, “Indemnifiable Amounts”); provided, however, that no Lender shall be liable for any portion of such Indemnifiable Amounts to the extent resulting from the Administrative Agent’s gross negligence or willful misconduct as determined by a court of competent jurisdiction in a final, non-appealable judgment or if the Administrative Agent fails to follow the written direction of the Requisite Lenders (or all of the Lenders if expressly required hereunder) unless such failure results from the Administrative Agent following the advice of counsel to the Administrative Agent of which advice the Lenders have received notice. Without limiting the generality of the foregoing but subject to the preceding proviso, each Lender agrees to reimburse the Administrative Agent (to the extent not reimbursed by the Borrower and without limiting the obligation of the Borrower to do so), promptly upon demand for its ratable share of any out‑of‑pocket expenses (including counsel fees of the counsel(s) of the Administrative Agent’s own choosing) incurred by the Administrative Agent in connection with the preparation, negotiation, execution, or enforcement of, or legal advice with respect to the rights or responsibilities of the parties under, the Loan Documents, any suit or action brought by the Administrative Agent to enforce the terms of the Loan Documents and/or collect any Obligations, any “lender liability” suit or claim brought against the Administrative Agent and/or the Lenders, and any claim or suit brought against the Administrative Agent, and/or the Lenders arising under any Environmental Laws. Such out‑of‑pocket expenses (including counsel fees) shall be advanced by the Lenders on the request of the Administrative Agent notwithstanding any claim or assertion that the Administrative Agent is not entitled to indemnification hereunder upon receipt of an undertaking by the Administrative Agent that the Administrative Agent will reimburse the Lenders if it is actually and finally determined by a court of competent jurisdiction that the Administrative Agent is not so entitled to indemnification. The agreements in this Section shall survive the payment of the Loans and all other amounts payable hereunder or under the other Loan Documents and the termination of this Agreement. If the Borrower shall reimburse the Administrative Agent for any Indemnifiable Amount following payment by any Lender to the Administrative Agent in respect of such Indemnifiable Amount pursuant to this Section, the Administrative Agent shall share such reimbursement on a ratable basis with each Lender making any such payment.

Section 11.8. Successor Administrative Agent.

The Administrative Agent may resign at any time as Administrative Agent under the Loan Documents by giving written notice thereof to the Lenders and the Borrower. The Administrative Agent may be removed as Administrative Agent under the Loan Documents for gross negligence or willful misconduct upon 30-day’s prior written notice by all Lenders (other than the Lender then acting as Administrative Agent). Upon any such resignation or removal, the Requisite Lenders shall have the right to appoint a successor Administrative Agent which appointment shall, provided no Default or Event of Default exists, be subject to the Borrower’s approval, which approval shall not be unreasonably withheld or delayed (except that the Borrower shall, in all events, be deemed to have approved each Lender and its Affiliates as a successor Administrative Agent). If no successor Administrative Agent shall have been so appointed in accordance with the immediately preceding sentence, and shall have accepted such appointment, within 30 days after the resigning Administrative Agent’s giving of notice of resignation or the giving of notice of the removal of the Administrative Agent, then the resigning or removed Administrative Agent may, on behalf of the Lenders, appoint a successor Administrative Agent, which shall be a Lender, if any Lender shall be willing to serve, and otherwise shall be a commercial bank having total combined assets of at least $50,000,000,000; provided, the resigning or removed Administrative Agent shall continue to serve as Administrative Agent until such time as a successor Administrative Agent shall have accepted such appointment. Upon the acceptance of any appointment as Administrative Agent hereunder by a successor Administrative Agent,

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such successor Administrative Agent shall thereupon succeed to and become vested with all the rights, powers, privileges and duties of the retiring Administrative Agent, and the retiring Administrative Agent shall be discharged from its duties and obligations under the Loan Documents; provided, however, such retiring Administrative Agent shall not be relieved from any obligations arising prior to its discharge to the extent resulting from the Administrative Agent’s gross negligence or willful misconduct as determined by a court of competent jurisdiction in a final, non-appealable judgment or from the failure by the Administrative Agent to follow the written direction of the Requisite Lenders (or all of the Lenders if expressly required hereunder) unless such failure results from the Administrative Agent following the advice of counsel to the Administrative Agent of which advice the Lenders have received notice. After any Administrative Agent’s resignation or removal hereunder as Administrative Agent, the provisions of this Article XI. shall continue to inure to its benefit as to any actions taken or omitted to be taken by it while it was Administrative Agent under the Loan Documents.

Section 11.9. Titled Agents.

Each of the Titled Agents in each such respective capacity, assumes no responsibility or obligation hereunder, including, without limitation, for servicing, enforcement or collection of any of the Loans, nor any duties as an agent hereunder for the Lenders. The titles of “Joint Lead Arranger”, “Joint Bookrunner”, “Syndication Agent” and any other similar titles are solely honorific and imply no fiduciary responsibility on the part of the Titled Agents to the Administrative Agent, the Borrower or any Lender and the use of such titles does not impose on the Titled Agents any duties or obligations greater than those of any other Lender or entitle the Titled Agents to any rights other than those to which any other Lender is entitled.

ARTICLE XII. MISCELLANEOUS

Section 12.1. Notices.

Unless otherwise provided herein, communications provided for hereunder shall be in writing and shall be mailed, telecopied or delivered as follows:

If to the Parent:

Corporate Office Properties Trust

6711 Columbia Gateway Drive, Suite 300

Columbia, Maryland 21046

Attention: General Counsel

Telephone Number:    (443) 285-5400

Telecopy Number:    (443) 285-7650

If to the Borrower:

Corporate Office Properties, L.P.

6711 Columbia Gateway Drive, Suite 300

Columbia, Maryland 21046

Attention: General Counsel

Telephone Number:    (443) 285-5400

Telecopy Number:    (443) 285-7650

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If to the Administrative Agent:

Capital One, National Association,

as Administrative Agent

1680 Capital One Drive, 10th Floor

McLean, Virginia 22102

Attn: Jessica W. Schneickert

Telephone:     (703) 720-6526

Telecopy:     (703) 720-2032

with a copy to:

Capital One, National Association,

as Administrative Agent

299 Park Ave., 31st Floor

New York, NY 10170

Attn: Thomas Kornobis, Commercial Loan Operations

Telephone:     (646) 836-5268

Telecopy:     (888) 246-3710

If to a Lender:

To such Lender’s address or telecopy number, as applicable, set forth in its Administrative Questionnaire;

or, as to each party at such other address as shall be designated by such party in a written notice to the other parties delivered in compliance with this Section. All such notices and other communications shall be effective (i) if mailed, when received; (ii) if telecopied, when transmitted; or (iii) if hand delivered or sent by overnight courier, when delivered. Notwithstanding the immediately preceding sentence, all notices or communications to the Administrative Agent or any Lender under Article II. shall be effective only when actually received. Neither the Administrative Agent nor any Lender shall incur any liability to the Borrower (nor shall the Administrative Agent incur any liability to the Lenders) for acting upon any telephonic notice referred to in this Agreement which the Administrative Agent or such Lender, as the case may be, believes in good faith to have been given by a Person authorized to deliver such notice or for otherwise acting in good faith hereunder.

Section 12.2. Expenses.

The Borrower agrees (a) to pay or reimburse the Administrative Agent for all of its reasonable out-of-pocket costs and expenses incurred in connection with the preparation, negotiation and execution of, and any amendment, supplement or modification to, any of the Loan Documents (including due diligence expenses and travel expenses relating to closing), and the consummation and administration of the transactions contemplated thereby, including the reasonable fees and disbursements of counsel to the Administrative Agent and costs and expenses in connection with the use of Intralinks, Inc. or other similar information transmission systems in connection with the Loan Documents, (b) to pay or reimburse the Administrative Agent, and the Lenders for all their costs and expenses incurred in connection with the enforcement or preservation of any rights under the Loan Documents, including the reasonable fees and disbursements of their respective counsel (including the allocated fees and expenses of in-house counsel) and any payments in indemnification or otherwise payable by the Lenders to the Administrative Agent

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pursuant to the Loan Documents, (c) to pay, and indemnify and hold harmless the Administrative Agent, and the Lenders from, any and all recording and filing fees and any and all liabilities with respect to, or resulting from any failure to pay or delay in paying, documentary, stamp, excise and other similar taxes, if any, which may be payable or determined to be payable in connection with the execution and delivery of any of the Loan Documents, or consummation of any amendment, supplement or modification of, or any waiver or consent under or in respect of, any Loan Document; and (d) to the extent not already covered by any of the preceding subsections, to pay or reimburse the Administrative Agent, and the Lenders for all their costs and expenses incurred in connection with any bankruptcy or other proceeding of the type described in Sections 10.1.(f) or 10.1.(g), including the reasonable fees and disbursements of counsel to the Administrative Agent and any Lender, whether such fees and expenses are incurred prior to, during or after the commencement of such proceeding or the confirmation or conclusion of any such proceeding. If the Borrower shall fail to pay any amounts required to be paid by it pursuant to this Section, the Administrative Agent, and/or the Lenders may pay such amounts on behalf of the Borrower and either deem the same to be Loans outstanding hereunder or otherwise Obligations owing hereunder.

Section 12.3. Setoff.

Subject to Section 3.3. and in addition to any rights now or hereafter granted under Applicable Law and not by way of limitation of any such rights, the Administrative Agent, each Lender and each Participant is hereby authorized by the Borrower, at any time or from time to time during the continuance of an Event of Default, without prior notice to the Borrower or to any other Person, any such notice being hereby expressly waived, but in the case of a Lender or Participant subject to receipt of the prior written consent of the Administrative Agent exercised in its sole discretion, to set off and to appropriate and to apply any and all deposits (general or special, including, but not limited to, indebtedness evidenced by certificates of deposit, whether matured or unmatured) and any other indebtedness at any time held or owing by the Administrative Agent, such Lender or any Affiliate of the Administrative Agent or such Lender, to or for the credit or the account of the Borrower against and on account of any of the Obligations, irrespective of whether or not any or all of the Loans and all other Obligations have been declared to be, or have otherwise become, due and payable as permitted by Section 10.2., and although such obligations shall be contingent or unmatured. Notwithstanding anything to the contrary in this Section, if any Defaulting Lender shall exercise any such right of setoff, (x) all amounts so set off shall be paid over immediately to the Administrative Agent for further application in accordance with the provisions of Section 3.11. and, pending such payment, shall be segregated by such Defaulting Lender from its other funds and deemed held in trust for the benefit of the Administrative Agent and the Lenders and (y) such Defaulting Lender shall provide promptly to the Administrative Agent a statement describing in reasonable detail the Obligations owing to such Defaulting Lender as to which it exercised such right of setoff.

Section 12.4. Litigation; Jurisdiction; Other Matters; Waivers.

(a)    EACH PARTY HERETO ACKNOWLEDGES THAT ANY DISPUTE OR CONTROVERSY BETWEEN OR AMONG THE PARENT, THE BORROWER, THE ADMINISTRATIVE AGENT OR ANY OF THE LENDERS WOULD BE BASED ON DIFFICULT AND COMPLEX ISSUES OF LAW AND FACT AND WOULD RESULT IN DELAY AND EXPENSE TO THE PARTIES. ACCORDINGLY, TO THE EXTENT PERMITTED BY APPLICABLE LAW, EACH OF THE LENDERS, THE ADMINISTRATIVE AGENT, THE PARENT AND THE BORROWER HEREBY WAIVES ITS RIGHT TO A TRIAL BY JURY IN ANY ACTION OR PROCEEDING OF ANY KIND OR NATURE IN ANY COURT OR TRIBUNAL IN WHICH AN ACTION MAY BE COMMENCED BY OR AGAINST ANY PARTY HERETO ARISING OUT OF THIS AGREEMENT, THE NOTES, OR ANY OTHER LOAN DOCUMENT OR BY REASON OF ANY OTHER SUIT, CAUSE OF ACTION OR DISPUTE

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WHATSOEVER BETWEEN OR AMONG THE PARENT, THE BORROWER, THE ADMINISTRATIVE AGENT OR ANY OF THE LENDERS OF ANY KIND OR NATURE RELATING TO ANY OF THE LOAN DOCUMENTS.

(b)    EACH OF THE PARENT, THE BORROWER, THE ADMINISTRATIVE AGENT AND EACH LENDER HEREBY AGREES THAT THE FEDERAL DISTRICT COURT LOCATED FOR THE SOUTHERN DISTRICT OF NEW YORK AND ANY STATE COURT LOCATED IN THE BOROUGH OF MANHATTAN, NEW YORK, NEW YORK, SHALL HAVE JURISDICTION TO HEAR AND DETERMINE ANY CLAIMS OR DISPUTES BETWEEN OR AMONG THE PARENT, THE BORROWER, THE ADMINISTRATIVE AGENT OR ANY OF THE LENDERS, PERTAINING DIRECTLY OR INDIRECTLY TO THIS AGREEMENT, THE LOANS, THE NOTES OR ANY OTHER LOAN DOCUMENT OR TO ANY MATTER ARISING HEREFROM OR THEREFROM. THE PARENT, THE BORROWER AND EACH OF THE LENDERS EXPRESSLY SUBMIT AND CONSENT IN ADVANCE TO SUCH JURISDICTION IN ANY ACTION OR PROCEEDING COMMENCED IN SUCH COURTS WITH RESPECT TO SUCH CLAIMS OR DISPUTES. EACH PARTY FURTHER WAIVES ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR PROCEEDING IN ANY SUCH COURT OR THAT SUCH ACTION OR PROCEEDING WAS BROUGHT IN AN INCONVENIENT FORUM, AND EACH AGREES NOT TO PLEAD OR CLAIM THE SAME. THE CHOICE OF FORUM SET FORTH IN THIS SECTION SHALL NOT BE DEEMED TO PRECLUDE THE BRINGING OF ANY ACTION BY THE ADMINISTRATIVE AGENT OR ANY LENDER OR THE ENFORCEMENT BY THE ADMINISTRATIVE AGENT OR ANY LENDER OF ANY JUDGMENT OBTAINED IN SUCH FORUM IN ANY OTHER APPROPRIATE JURISDICTION.

(c)    THE PROVISIONS OF THIS SECTION HAVE BEEN CONSIDERED BY EACH PARTY WITH THE ADVICE OF COUNSEL AND WITH A FULL UNDERSTANDING OF THE LEGAL CONSEQUENCES THEREOF, AND SHALL SURVIVE THE PAYMENT OF THE LOANS AND ALL OTHER AMOUNTS PAYABLE HEREUNDER OR UNDER THE OTHER LOAN DOCUMENTS AND THE TERMINATION OF THIS AGREEMENT.

Section 12.5. Successors and Assigns.

(a)    Successors and Assigns Generally. The provisions of this Agreement shall be binding upon and inure to the benefit of the parties hereto and their respective successors and assigns permitted hereby, except that neither the Borrower nor the Parent may assign or otherwise transfer any of its rights or obligations hereunder without the prior written consent of the Administrative Agent and each Lender and no Lender may assign or otherwise transfer any of its rights or obligations hereunder except (i) to an Eligible Assignee in accordance with the provisions of the immediately following subsection (b), (ii) by way of participation in accordance with the provisions of the immediately following subsection (d) or (iii) by way of pledge or assignment of a security interest subject to the restrictions of the immediately following subsection (f). Subject to the last sentence of the immediately following subsection (b), any attempted assignment or transfer by any party hereto not permitted by clauses (i) through (iii) of the immediately preceding sentence shall be null and void. Nothing in this Agreement, expressed or implied, shall be construed to confer upon any Person (other than the parties hereto, their respective successors and assigns permitted hereby, Participants to the extent provided in the immediately following subsection (d) and, to the extent expressly contemplated hereby, the Related Parties of the Administrative Agent and the Lenders) any legal or equitable right, remedy or claim under or by reason of this Agreement.

(b)    Assignments by Lenders. Any Lender may at any time assign to one or more Eligible Assignees all or a portion of its rights and obligations under this Agreement (including all or a portion of its

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Commitments and the Loans at the time owing to it); provided that any such assignment shall be subject to the following conditions:

(i)    Minimum Amounts.

(A)    in the case of an assignment of the entire remaining amount of an assigning Lender’s Commitment and/or Loans at the time owing to it, or in the case of an assignment to a Lender, an Affiliate of a Lender or an Approved Fund, no minimum amount need be assigned; and

(B)    in any case not described in the immediately preceding subsection (A), the aggregate amount of Commitments (which for this purpose includes Loans outstanding thereunder) or, if the Commitments are not then in effect, the principal outstanding balance of Loans of the assigning Lender subject to each such assignment (in each case, determined as of the date the Assignment and Acceptance Agreement with respect to such assignment is delivered to the Administrative Agent or, if “Trade Date” is specified in the Assignment and Acceptance Agreement, as of the Trade Date) shall not be less than $10,000,000 in the case of any assignment of a Commitment or a Loan, unless each of the Administrative Agent and, so long as no Default or Event of Default shall exist, the Borrower otherwise consents (each such consent not to be unreasonably withheld or delayed); provided, however, that if after giving effect to such assignment, the amount of the Commitment held by such assigning Lender or, if the applicable Commitment is not then in effect, the outstanding principal balance of the Loans of such assigning Lender, as applicable, would be less than $10,000,000 in the case of a Commitment or Loan, then such assigning Lender shall assign the entire amount of its Commitment and the Loans at the time owing to it; provided, further, that, notwithstanding the foregoing, a Lender may assign the entire remaining amount of Term Loans held by it without having to otherwise comply with this subsection (B).

(ii)    Proportionate Amounts. Each partial assignment shall be made as an assignment of a proportionate part of all the assigning Lender’s rights and obligations under this Agreement with respect to the Loan or the Commitment assigned.

(iii)    Required Consents. No consent shall be required for any assignment except to the extent required by clause (i)(B) of this subsection (b) and, in addition:

(A)    the consent of the Borrower (such consent not to be unreasonably withheld or delayed) shall be required unless (x) a Default or Event of Default shall exist at the time of such assignment or (y) such assignment is to a Lender, an Affiliate of a Lender or an Approved Fund; provided that the Borrower shall be deemed to have consented to any such assignment unless it shall object thereto by written notice to the Administrative Agent within 5 Business Days after having received notice thereof; and

(B)    the consent of the Administrative Agent (such consent not to be unreasonably withheld or delayed) shall be required for assignments in respect of (x) a Commitment if such assignment is to a Person that is not already a Lender, an Affiliate of a Lender or an Approved Fund with respect to a Lender or (y) a Loan to a Person who is not a Lender, an Affiliate of a Lender or an Approved Fund.

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(iv)    Assignment and Acceptance Agreement; Notes. The parties to each assignment shall execute and deliver to the Administrative Agent an Assignment and Acceptance Agreement, together with a processing and recordation fee of $3,500 for each assignment, and the assignee, if it is not a Lender, shall deliver to the Administrative Agent an Administrative Questionnaire. If requested by the transferor Lender or the Eligible Assignee, upon the consummation of any assignment, the transferor Lender, the Administrative Agent and the Borrower shall make appropriate arrangements so that new Notes are issued to the Eligible Assignee and such transferor Lender, as appropriate.

(v)    No Assignment to Certain Persons. No such assignment shall be made to (A) the Parent, the Borrower or any of the Parent or the Borrower’s Affiliates or Subsidiaries or (B) any Defaulting Lender or any of its Subsidiaries, or any Person who, upon becoming a Lender hereunder, would constitute any of the foregoing Persons described in this clause (B).

(vi)    No Assignment to Natural Persons. No such assignment shall be made to a natural person.

(vii)    Certain Additional Payments. In connection with any assignment of rights and obligations of any Defaulting Lender hereunder, no such assignment shall be effective unless and until, in addition to the other conditions thereto set forth herein, the parties to the assignment shall make such additional payments to the Administrative Agent in an aggregate amount sufficient, upon distribution thereof as appropriate (which may be outright payment, purchases by the assignee of participations or subparticipations, or other compensating actions, including funding, with the consent of the Borrower and the Administrative Agent, the applicable pro rata share of Loans previously requested but not funded by the Defaulting Lender, to each of which the applicable assignee and assignor hereby irrevocably consent), to pay and satisfy in full all payment liabilities then owed by such Defaulting Lender to the Administrative Agent and each Lender hereunder (and interest accrued thereon). Notwithstanding the foregoing, in the event that any assignment of rights and obligations of any Defaulting Lender hereunder shall become effective under Applicable Law without compliance with the provisions of this paragraph, then the assignee of such interest shall be deemed to be a Defaulting Lender for all purposes of this Agreement until such compliance occurs.

Subject to acceptance and recording thereof by the Administrative Agent pursuant to the immediately following subsection (c), from and after the effective date specified in each Assignment and Acceptance Agreement, the assignee thereunder shall be a party to this Agreement and, to the extent of the interest assigned by such Assignment and Acceptance Agreement, have the rights and obligations of a Lender under this Agreement, and the assigning Lender thereunder shall, to the extent of the interest assigned by such Assignment and Acceptance Agreement, be released from its obligations under this Agreement (and, in the case of an Assignment and Acceptance Agreement covering all of the assigning Lender’s rights and obligations under this Agreement, such Lender shall cease to be a party hereto) but shall continue to be entitled to the benefits of Sections 4.4., 12.2. and 12.9. and the other provisions of this Agreement and the other Loan Documents as provided in Section 12.10. with respect to facts and circumstances occurring prior to the effective date of such assignment; provided, that except to the extent otherwise expressly agreed by the affected parties, no assignment by a Defaulting Lender will constitute a waiver or release of any claim of any party hereunder arising from that Lender having been a Defaulting Lender. Any assignment or transfer by a Lender of rights or obligations under this Agreement that does not comply with this paragraph shall be treated for purposes of this Agreement as a sale by such Lender of a participation in such rights and obligations in accordance with the immediately following subsection (d).

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(c)    Register. The Administrative Agent, acting solely for this purpose as a non-fiduciary agent of the Borrower, shall maintain at the Principal Office a copy of each Assignment and Acceptance Agreement delivered to it and a register for the recordation of the names and addresses of the Lenders, and the Commitments of, and principal amounts (and stated interest) of the Loans owing to, each Lender pursuant to the terms hereof from time to time (the “Register”). The entries in the Register shall be conclusive absent manifest error, and the Borrower, the Administrative Agent and the Lenders may treat each Person whose name is recorded in the Register pursuant to the terms hereof as a Lender hereunder for all purposes of this Agreement. The Register shall be available for inspection by the Borrower and any Lender, at any reasonable time and from time to time upon reasonable prior notice.

(d)    Participations. Any Lender may at any time, without the consent of, or notice to, the Borrower or the Administrative Agent, sell participations to any Person (other than a natural person or the Borrower or any of the Borrower’s Affiliates or Subsidiaries) (each, a “Participant”) in all or a portion of such Lender’s rights and/or obligations under this Agreement (including all or a portion of its Commitment and/or the Loans owing to it); provided that (i) such Lender’s obligations under this Agreement shall remain unchanged, (ii) such Lender shall remain solely responsible to the other parties hereto for the performance of such obligations and (iii) the Borrower, the Administrative Agent and the Lenders shall continue to deal solely and directly with such Lender in connection with such Lender’s rights and obligations under this Agreement. Any agreement or instrument pursuant to which a Lender sells such a participation shall provide that such Lender shall retain the sole right to enforce this Agreement and to approve any amendment, modification or waiver of any provision of this Agreement; provided that such agreement or instrument may provide that such Lender will not, without the consent of the Participant, agree to (w) increase such Lender’s Commitment, (x) extend the date fixed for the payment of principal on the Loans or portions thereof owing to such Lender, (y) reduce the rate at which interest is payable thereon or (z) release any Guarantor from its Obligations under the Guaranty (except as otherwise permitted under Section 7.12.(c)) in each case, as applicable to that portion of such Lender’s rights and/or obligations that are subject to the participation. Subject to the immediately following subsection (e), the Borrower agrees that each Participant shall be entitled to the benefits of Sections 3.12., 4.1., 4.4.to the same extent as if it were a Lender and had acquired its interest by assignment pursuant to paragraph (b) of this Section. To the extent permitted by Applicable Law, each Participant also shall be entitled to the benefits of Section 12.3. as though it were a Lender, provided such Participant agrees to be subject to Section 3.3. as though it were a Lender. Each Lender that sells a participation shall, acting solely for this purpose as a non-fiduciary agent of the Borrower, maintain a register on which it enters the name and address of each Participant and the principal amounts (and stated interest) of each Participant’s interest in the Loans or other obligations under the Loan Documents (and is maintained in accordance with Sections 5f. 103-1(c) and 1.871-14(c)(1)(i) of the United States Treasury Regulations) (the “Participant Register”); provided that no Lender shall have any obligation to disclose all or any portion of the Participant Register (including the identity of any Participant or any information relating to a Participant’s interest in any commitments, loans or its other obligations under any Loan Document) to any Person except to the extent that such disclosure is necessary to establish that such commitment, loan, letter of credit or other obligation is in registered form under Sections 5f.103-1(c) and 1.871-14(c)(1)(i) of the United States Treasury Regulations. The entries in the Participant Register shall be conclusive absent manifest error, and such Lender shall treat each Person whose name is recorded in the Participant Register as the owner of such participation for all purposes of this Agreement notwithstanding any notice to the contrary. For the avoidance of doubt, the Administrative Agent (in its capacity as Administrative Agent) shall have no responsibility for maintaining a Participant Register.

(e)    Limitations upon Participant Rights. A Participant shall not be entitled to receive any greater payment under Sections 3.12., 4.1. and 4.4. than the applicable Lender would have been entitled to receive with respect to the participation sold to such Participant, unless the sale of the participation to such Participant

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is made with the Borrower’s prior written consent which consent may be withheld in the Borrower’s sole discretion. A Participant that is organized under the laws of a jurisdiction outside of the United States of America shall not be entitled to the benefits of Section 3.12. unless the Borrower is notified of the participation sold to such Participant and such Participant agrees, for the benefit of the Borrower and the Administrative Agent, to comply with Section 3.12.(g) as though it were a Lender (it being understood that the documentation required under Section 3.12.(g) shall be delivered to the participating Lender).

(f)    Certain Pledges. Any Lender may at any time pledge or assign a security interest in all or any portion of its rights under this Agreement to secure obligations of such Lender, including any pledge or assignment to secure obligations to a Federal Reserve Bank; provided that no such pledge or assignment shall release such Lender from any of its obligations hereunder or substitute any such pledgee or assignee for such Lender as a party hereto.

(g)    No Registration. Each Lender agrees that, without the prior written consent of the Borrower and the Administrative Agent exercised in their sole discretion, it will not make any assignment hereunder in any manner or under any circumstances that would require registration or qualification of, or filings in respect of, any Loan or Note under the Securities Act or any other securities laws of the United States of America or of any other jurisdiction.

Section 12.6. Amendments.

(a)    Generally. Except as otherwise expressly provided in this Agreement, any consent or approval required or permitted by this Agreement or any other Loan Document to be given by the Lenders may be given, and any term of this Agreement or of any other Loan Document may be amended, and the performance or observance by the Borrower or any other Loan Party or any Subsidiary of any terms of this Agreement or such other Loan Document or the continuance of any Default or Event of Default may be waived (either generally or in a particular instance and either retroactively or prospectively) with, but only with, the written consent of the Requisite Lenders (and, in the case of an amendment to any Loan Document, the written consent of each Loan Party a party thereto).

(b)    Additional Lender Consents. In addition to the foregoing requirements, no amendment waiver or consent shall do any of the following:

(i)    (A) increase (or reinstate) the Commitment of a Lender or subject a Lender to any additional obligations without the written consent of such Lender or (B) increase the aggregate outstanding principal amount of the Loans in excess of any limit imposed under Section 2.9. without the consent of each Lender;

(ii)    reduce the principal of, or interest that has accrued or the rates of interest that will be charged on the outstanding principal amount of, any Loans or other Obligations without the written consent of each Lender directly affected thereby; provided, however, only the written consent of the Requisite Lenders shall be required for the waiver of interest payable at the Post-Default Rate, retraction of the imposition of interest at the Post-Default Rate and amendment of the definition of “Post-Default Rate”;

(iii)    reduce the amount of any Fees payable to a Lender without the written consent of such Lender;

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(iv)    modify the definition of “Maturity Date”, “Availability Termination Date” or otherwise postpone any date fixed for, or forgive, any payment of principal of, or interest on, any Loans or for the payment of Fees or any other Obligations owing to the Lenders, in each case, without the written consent of each Lender directly affected thereby;

(v)    modify the definition of “Pro Rata Share” or amend or otherwise modify the provisions of Section 2.3. or 3.2. without the written consent of each Lender;

(vi)    amend this Section or amend the definitions of the terms used in this Agreement or the other Loan Documents insofar as such definitions affect the substance of this Section, modify the definition of the term “Requisite Lenders” or modify in any other manner the number or percentage of the Lenders required to make any determinations or waive any rights hereunder or to modify any provision hereof without the written consent of each Lender;

(vii)    release the Parent as a Guarantor or any other Guarantor from its obligations under the Guaranty (except as expressly permitted by Section 7.12.(c)) without the written consent of each Lender; provided, however, the consent of each Lender shall not otherwise be required under this clause (vii) for any amendment, waiver or consent which does not expressly provide for the release of a Guarantor (but which may indirectly result in such a release);

(viii)    waive any Default or Event of Default occurring under Section 10.1.(a) or Section 10.1.(b) without the written consent of each Lender owed the Obligations that were not paid when due resulting in such Default or Event of Default.

(c)    No amendment, waiver or consent, unless in writing and signed by the Administrative Agent, in such capacity, in addition to the Lenders required hereinabove to take such action, shall affect the rights or duties of the Administrative Agent under this Agreement or any of the other Loan Documents.

(d)    Notwithstanding anything to the contrary herein, no Defaulting Lender shall have any right to approve or disapprove any amendment, waiver or consent hereunder (and any amendment, waiver or consent which by its terms requires the consent of all Lenders or each affected Lender may be effected with the consent of the applicable Lenders other than Defaulting Lenders), except that (x) the Commitments of any Defaulting Lender may not be increased, reinstated or extended without the written consent of such Defaulting Lender and (y) any waiver, amendment or modification requiring the consent of all Lenders or each affected Lender that by its terms affects any Defaulting Lender more adversely than other affected Lenders shall require the written consent of such Defaulting Lender. No waiver shall extend to or affect any obligation not expressly waived or impair any right consequent thereon and any amendment, waiver or consent shall be effective only in the specific instance and for the specific purpose set forth therein. No course of dealing or delay or omission on the part of the Administrative Agent or any Lender in exercising any right shall operate as a waiver thereof or otherwise be prejudicial thereto. Any Event of Default occurring hereunder shall continue to exist until such time as such Event of Default is waived in writing in accordance with the terms of this Section, notwithstanding any attempted cure or other action by the Borrower, any other Loan Party or any other Person subsequent to the occurrence of such Event of Default. Except as otherwise explicitly provided for herein or in any other Loan Document, no notice to or demand upon the Borrower shall entitle the Borrower to any other or further notice or demand in similar or other circumstances.

(e)    Notwithstanding anything to the contrary in this Section 12.6., if the Administrative Agent and the Borrower have jointly identified an ambiguity, omission, mistake or defect in any provision of this Agreement or an inconsistency between provisions of this Agreement, the Administrative Agent and the

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Borrower shall be permitted to amend such provision or provisions to cure such ambiguity, omission, mistake, defect or inconsistency so long as to do so would not adversely affect the interests of the Lenders. Any such amendment shall become effective without any further action or consent of any of other party to this Agreement.

(f)    Modifications to Existing Credit Agreement. Notwithstanding anything to the contrary contained in this Agreement but subject to Section 12.6.(b), if (i)(x) any of the representations and warranties, covenants, events of default or other material terms contained in Article VI. through Article X. of the Existing Credit Agreement (including any related definitions for such provisions) are hereafter amended or otherwise in any material respect, or compliance therewith is waived, or any additional representations, warranties, covenants or events of default are added to the Existing Credit Agreement, or (y) a Property is included as an Eligible Unencumbered Property (as defined in the Existing Credit Agreement) for purposes of the calculation of Unencumbered Asset Value (as defined in the Existing Credit Agreement) which Property does not meet one or more of the criteria for inclusion set forth in the Existing Credit Agreement (each of the deviations from the Existing Credit Agreement in the immediately preceding clauses (x) and (y), a “Modification”; the written amendment, modification, supplement or waiver enacting such Modification to the Existing Credit Agreement, a “Modification Document”), and (ii) the Lenders hereunder constituting the Requisite Lenders that are also Lenders under the Existing Credit Agreement (an “Existing Credit Agreement Lender”) expressly approved the applicable Modification Document (a “Consenting Lender”), then the substantive terms contained in the Modification shall be deemed incorporated and given effect in this Agreement to the same extent as though set forth in full herein, so as to have the provisions of this Agreement consistent with such Modification of the Existing Credit Agreement. Any Corresponding Modification shall be effective only in the specific instance and for the specific purpose for which given. For purposes hereof, “Corresponding Modification” shall mean any deemed or written amendment, modification, supplement or waiver to this Agreement that enacts the terms of a Modification to the Existing Credit Agreement that correspond to terms contained in this Agreement.

At any time that the Administrative Agent is not an Existing Credit Agreement Lender, the Borrower agrees to provide the Administrative Agent with (x) a copy of all draft Modification Documents with respect to the Existing Credit Agreement within 10 days (or such shorter period as may be acceptable to the Administrative Agent) prior to the execution thereof, (y) updated information with respect to each proposed Modification during the negotiation thereof upon the request of the Administrative Agent and (z) a final, executed copy of each Modification Document. The Borrower, each Consenting Lender and any other Lender that has approved a Corresponding Modification each agrees to execute and deliver promptly after the Administrative Agent’s or the Requisite Lenders’ request an amendment, modification, supplement or waiver to this Agreement (in form and substance satisfactory to the Administrative Agent or the Requisite Lenders, as applicable, and the Borrower) to reflect the intent of this subsection (f), provided, that the execution and delivery thereof shall not be a condition to the effectiveness of such amendment, modification, supplement or waiver. At any time that the Administrative Agent is an Existing Credit Agreement Lender, Borrower shall be deemed to have provided the notice required to the Administrative Agent hereunder upon execution of any Modification Documents.

Notwithstanding the foregoing, if any representation, warranty or covenant contained in the Existing Credit Agreement (including any related definitions for such provision) is amended or otherwise modified in a manner that is more restrictive to the Loan Parties or more favorable to the Existing Credit Agreement Lenders than the representations, warranties or covenants then set forth in the Existing Credit Agreement or any additional representation, warranty or covenant not set forth in this Agreement is included in the Existing Credit Agreement and such representation, warranty or covenant is more restrictive to the Loan Parties or more favorable to the Existing Credit Agreement Lenders than the representations, warranties or covenants

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then set forth in the Existing Credit Agreement, then and in such event the Borrower shall provide notice thereof to the Administrative Agent and the corresponding representation, warranty or covenant set forth in this Agreement shall automatically be deemed to be amended, modified or incorporated herein by reference, as applicable, with the same effect as in the Existing Credit Agreement.

Section 12.7. Nonliability of Administrative Agent and Lenders.

The relationship between the Borrower and the Lenders and the Administrative Agent shall be solely that of borrower and lender. Neither the Administrative Agent nor any Lender shall have any fiduciary responsibilities to the Parent or the Borrower and no provision in this Agreement or in any of the other Loan Documents, and no course of dealing between or among any of the parties hereto, shall be deemed to create any fiduciary duty owing by the Administrative Agent or any Lender to any Lender, the Parent, the Borrower, any Subsidiary of the Parent or the Borrower or any other Loan Party. Neither the Administrative Agent nor any Lender undertakes any responsibility to the Borrower or the Parent to review or inform the Borrower or the Parent of any matter in connection with any phase of the Borrower’s or Parent’s business or operations.

Section 12.8. Confidentiality.

The Administrative Agent and each Lender shall use reasonable efforts to assure that information about the Borrower, the Parent, the other Loan Parties and other Subsidiaries of the Parent and the Borrower, and the Properties thereof and their operations, affairs and financial condition, not generally disclosed to the public, which is furnished to the Administrative Agent or any Lender pursuant to the provisions of this Agreement or any other Loan Document, is used only for the purposes of this Agreement and the other Loan Documents and shall not be divulged to any Person other than the Administrative Agent, the Lenders, and their respective agents who are actively and directly participating in the evaluation, administration or enforcement of the Loan Documents and other transactions between the Administrative Agent or such Lender, as applicable, and the Borrower and the Parent, but in any event the Administrative Agent and the Lenders may make disclosure: (a) to any of their respective Affiliates (provided such Affiliates shall agree to keep such information confidential in accordance with the terms of this Section 12.8.); (b) as reasonably requested by any bona fide Eligible Assignee, Participant or other transferee in connection with the contemplated transfer of any Commitment or participations therein as permitted hereunder (provided they shall agree to keep such information confidential in accordance with the terms of this Section); (c) as required or requested by any Governmental Authority or representative thereof or pursuant to legal process or in connection with any legal proceedings; (d) to the Administrative Agent’s or such Lender’s independent auditors and other professional advisors (provided they shall be notified of the confidential nature of the information); (e) after the happening and during the continuance of an Event of Default, to any other Person, in connection with the exercise by the Administrative Agent or the Lenders of rights hereunder or under any of the other Loan Documents; (f) upon Borrower’s prior consent (which consent shall not be unreasonably withheld), to any contractual counter-parties to any swap or similar hedging agreement or to any rating agency; (g) to the extent such information (x) becomes publicly available other than as a result of a breach of this Section actually known to such Lender to be such a breach or (y) becomes available to the Administrative Agent or any Lender on a nonconfidential basis from a source other than the Parent, the Borrower or any Affiliate, and (h) with the consent of the Borrower. Notwithstanding the foregoing, the Administrative Agent and each Lender may disclose any such confidential information, upon notice to the Borrower or any other Loan Party, to the extent practicable (provided, that, any failure by the Administrative Agent or any Lender to give such notice to the Borrower or any Loan Party shall not subject the Administrative Agent or any Lender to any liability which may arise from such failure to give notice), to Governmental Authorities in connection with any regulatory examination of the Administrative Agent or such Lender or in accordance with the regulatory compliance policy of the Administrative Agent or such Lender.

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Section 12.9. Indemnification.

(a)    The Borrower shall and hereby agrees to indemnify, defend and hold harmless the Administrative Agent, each of the Lenders, any Affiliate of the Administrative Agent or any Lender, and their respective directors, officers, shareholders, agents, employees and counsel (each referred to herein as an “Indemnified Party”) from and against any and all of the following (collectively, the “Indemnified Costs”): losses, costs, claims, damages, liabilities, deficiencies, judgments or expenses of every kind and nature (including, without limitation, amounts paid in settlement, court costs and the reasonable fees and disbursements of counsel incurred in connection with any litigation, investigation, claim or proceeding or any advice rendered in connection therewith, but excluding losses, costs, claims, damages, liabilities, deficiencies, judgments or expenses indemnification in respect of which is specifically covered by Section 3.12. or 4.1. or expressly excluded from the coverage of such Sections 3.12. or 4.1.) incurred by an Indemnified Party in connection with, arising out of, or by reason of, any suit, cause of action, claim, arbitration, investigation or settlement, consent decree or other proceeding (the foregoing referred to herein as an “Indemnity Proceeding”) which is in any way related directly or indirectly to: (i) this Agreement or any other Loan Document or the transactions contemplated thereby; (ii) the making of any Loans hereunder; (iii) any actual or proposed use by the Borrower of the proceeds of the Loans; (iv) the Administrative Agent’s or any Lender’s entering into this Agreement; (v) the fact that the Administrative Agent and the Lenders have established the credit facility evidenced hereby in favor of the Borrower; (vi) the fact that the Administrative Agent and the Lenders are creditors of the Borrower and have or are alleged to have information regarding the financial condition, strategic plans or business operations of the Parent, the Borrower and their respective Subsidiaries; (vii) the fact that the Administrative Agent and the Lenders are material creditors of the Borrower and are alleged to influence directly or indirectly the business decisions or affairs of the Parent, the Borrower and their respective Subsidiaries or their financial condition; (viii) the exercise of any right or remedy the Administrative Agent or the Lenders may have under this Agreement or the other Loan Documents; (ix) any civil penalty or fine assessed by the OFAC against, and all reasonable costs and expenses (including counsel fees and disbursements) incurred in connection with defense thereof by, the Administrative Agent or any Lender as a result of conduct of the Borrower, any other Loan Party or any Subsidiary that violates a sanction enforced by the OFAC; or (x) any violation or non‑compliance by the Parent, the Borrower or any Subsidiary of any Applicable Law (including any Environmental Law) including, but not limited to, any Indemnity Proceeding commenced by (A) the Internal Revenue Service or state taxing authority or (B) any Governmental Authority or other Person under any Environmental Law, including any Indemnity Proceeding commenced by a Governmental Authority or other Person seeking remedial or other action to cause the Parent, the Borrower or their respective Subsidiaries (or its respective properties) (or the Administrative Agent and/or the Lenders as successors to the Borrower) to be in compliance with such Environmental Laws; provided, however, that the Borrower shall not be obligated to indemnify any Indemnified Party for (A) any acts or omissions of such Indemnified Party in connection with matters described in this subsection to the extent arising from the gross negligence or willful misconduct of such Indemnified Party, as determined by a court of competent jurisdiction in a final, non-appealable judgment or (B) Indemnified Costs to the extent arising directly out of or resulting directly from claims of one or more Indemnified Parties against another Indemnified Party.

(b)    The Borrower’s indemnification obligations under this Section 12.9. shall apply to all Indemnity Proceedings arising out of, or related to, the foregoing whether or not an Indemnified Party is a named party in such Indemnity Proceeding. In this regard, this indemnification shall cover all Indemnified Costs of any Indemnified Party in connection with any deposition of any Indemnified Party or compliance with any subpoena (including any subpoena requesting the production of documents). This indemnification shall, among other things, apply to any Indemnity Proceeding commenced by other creditors of the Parent,

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the Borrower or any Subsidiary, any shareholder of the Parent, the Borrower or any Subsidiary (whether such shareholder(s) are prosecuting such Indemnity Proceeding in their individual capacity or derivatively on behalf of the Borrower or the Parent), any account debtor of the Parent, the Borrower or any Subsidiary or by any Governmental Authority. If indemnification is to be sought hereunder by an Indemnified Party, then such Indemnified Party shall notify the Borrower in writing of the commencement of any Indemnity Proceeding; provided, however, that the failure to so notify the Borrower shall not relieve the Borrower from any liability that it may have to such Indemnified Party pursuant to this Section 12.9.

(c)    This indemnification shall apply to any Indemnity Proceeding arising during the pendency of any bankruptcy proceeding filed by or against the Parent, the Borrower and/or any Subsidiary.

(d)    All out‑of‑pocket fees and expenses of, and all amounts paid to third‑persons by, an Indemnified Party shall be advanced by the Borrower at the request of such Indemnified Party notwithstanding any claim or assertion by the Borrower that such Indemnified Party is not entitled to indemnification hereunder, upon receipt of an undertaking by such Indemnified Party that such Indemnified Party will reimburse the Borrower if it is actually and finally determined by a court of competent jurisdiction that such Indemnified Party is not so entitled to indemnification hereunder.

(e)    An Indemnified Party may conduct its own investigation and defense of, and may formulate its own strategy with respect to, any Indemnity Proceeding covered by this Section and, as provided above, all Indemnified Costs incurred by such Indemnified Party shall be reimbursed by the Borrower. No action taken by legal counsel chosen by an Indemnified Party in investigating or defending against any such Indemnity Proceeding shall vitiate or in any way impair the obligations and duties of the Borrower hereunder to indemnify and hold harmless each such Indemnified Party; provided, however, that if (i) the Borrower is required to indemnify an Indemnified Party pursuant hereto and (ii) the Borrower has provided evidence reasonably satisfactory to such Indemnified Party that the Borrower has the financial wherewithal to reimburse such Indemnified Party for any amount paid by such Indemnified Party with respect to such Indemnity Proceeding, such Indemnified Party shall not settle or compromise any such Indemnity Proceeding without the prior written consent of the Borrower (which consent shall not be unreasonably withheld or delayed). Notwithstanding the foregoing, an Indemnified Party may settle or compromise any such Indemnity Proceeding without the prior written consent of the Borrower where (x) no monetary relief is sought against such Indemnified Party in such Indemnity Proceeding or (y) there is an allegation of a violation of law by such Indemnified Party.

(f)    If and to the extent that the obligations of the Borrower under this Section are unenforceable for any reason, the Borrower hereby agrees to make the maximum contribution to the payment and satisfaction of such obligations which is permissible under Applicable Law.

(g)    The Borrower’s obligations under this Section shall survive any termination of this Agreement and the other Loan Documents and the payment in full in cash of the Obligations, and are in addition to, and not in substitution of, any other of their obligations set forth in this Agreement or any other Loan Document to which it is a party.

Section 12.10. Termination; Survival.

This Agreement shall terminate at such time as (a) all of the Commitments have been terminated, (b) none of the Lenders is obligated any longer under this Agreement to make any Loans and (c) all Obligations (other than obligations which survive as provided in the following sentence) have been paid and satisfied in full. The indemnities to which the Administrative Agent and the Lenders are entitled under the provisions

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of Sections 3.12., 4.1., 4.4., 11.7., 12.2. and 12.9. and any other provision of this Agreement and the other Loan Documents, and the provisions of Section 12.4., shall continue in full force and effect and shall protect the Administrative Agent and the Lenders (i) notwithstanding any termination of this Agreement, or of the other Loan Documents, against events arising before such termination as well as, in the case of Sections 11.7., 12.4. and 12.9., after such termination and (ii) at all times after any such party ceases to be a party to this Agreement with respect to all matters and events existing on or prior to the date such party ceased to be a party to this Agreement.

Section 12.11. Severability of Provisions.

Any provision of this Agreement which is prohibited or unenforceable in any jurisdiction shall, as to such jurisdiction, be ineffective only to the extent of such prohibition or unenforceability without invalidating the remainder of such provision or the remaining provisions or affecting the validity or enforceability of such provision in any other jurisdiction.

Section 12.12. GOVERNING LAW.

THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS EXECUTED, AND TO BE FULLY PERFORMED, IN SUCH STATE.

Section 12.13. Counterparts.

To facilitate execution, this Agreement and any amendments, waivers, consents or supplements may be executed in any number of counterparts as may be convenient or required (which may be effectively delivered by facsimile, in portable document format (“PDF”) or other similar electronic means). It shall not be necessary that the signature of, or on behalf of, each party, or that the signature of all persons required to bind any party, appear on each counterpart. All counterparts shall collectively constitute a single document. It shall not be necessary in making proof of this document to produce or account for more than a single counterpart containing the respective signatures of, or on behalf of, each of the parties hereto.

Section 12.14. Obligations with Respect to Loan Parties.

The obligations of the Parent and the Borrower to direct or prohibit the taking of certain actions by the other Loan Parties as specified herein shall be absolute and not subject to any defense the Parent or the Borrower may have that the Parent or the Borrower does not control such Loan Parties.

Section 12.15. Limitation of Liability.

Neither the Administrative Agent nor any Lender, nor any Affiliate, officer, director, employee, attorney, or agent of the Administrative Agent or any Lender shall have any liability with respect to, and the Parent and the Borrower hereby waives, releases, and agrees not to sue any of them upon, any claim for any special, indirect, incidental, or consequential damages suffered or incurred by the Parent or the Borrower in connection with, arising out of, or in any way related to, this Agreement or any of the other Loan Documents, or any of the transactions contemplated by this Agreement or any of the other Loan Documents. Each of the Parent and the Borrower hereby waives, releases, and agrees not to sue the Administrative Agent or any Lender or any of the Administrative Agent’s or any Lender’s Affiliates, officers, directors, employees, attorneys, or agents for punitive damages in respect of any claim in connection with, arising out of, or in

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any way related to, this Agreement or any of the other Loan Documents, or any of the transactions contemplated by this Agreement or financed hereby.

Section 12.16. Entire Agreement.

This Agreement, the Notes, and the other Loan Documents referred to herein embody the final, entire agreement among the parties hereto and supersede any and all prior commitments, agreements, representations, and understandings, whether written or oral, relating to the subject matter hereof and thereof and may not be contradicted or varied by evidence of prior, contemporaneous, or subsequent oral agreements or discussions of the parties hereto. There are no oral agreements among the parties hereto. To the extent any term of this Agreement is inconsistent with a term of any other Loan Document to which the parties of this Agreement are party, the term of this Agreement shall control to the extent of such inconsistency.

Section 12.17. Construction.

The Administrative Agent, the Borrower, the Parent and each Lender acknowledge that each of them has had the benefit of legal counsel of its own choice and has been afforded an opportunity to review this Agreement and the other Loan Documents with its legal counsel and that this Agreement and the other Loan Documents shall be construed as if jointly drafted by the Administrative Agent, the Borrower, the Parent and each Lender.

Section 12.18. Patriot Act.

The Lenders and the Administrative Agent each hereby notifies the Borrower that pursuant to the requirements of the Patriot Act, it is required to obtain, verify and record information that identifies the Borrower, which information includes the name and address of the Borrower and other information that will allow such Lender or the Administrative Agent, as applicable, to identify the Borrower in accordance with such Act.

Section 12.19. Headings.

The paragraph and section headings in this Agreement are provided for convenience of reference only and shall not affect its construction or interpretation.

[Signatures on Following Pages]

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IN WITNESS WHEREOF, the parties hereto have caused this Term Loan Agreement to be executed by their authorized officers all as of the day and year first above written.

CORPORATE OFFICE PROPERTIES, L.P.

By: Corporate Office Properties Trust, its sole general partner

By:/s/ Scott D. Robuck

Name: Scott D. Robuck

Title: Vice President

CORPORATE OFFICE PROPERTIES TRUST

By:/s/ Scott D. Robuck

Name: Scott D. Robuck

Title: Vice President

[Signatures Continued Next Page]

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[Signature Page to Term Loan Agreement with Corporate Office Properties, L.P.]

CAPITAL ONE, NATIONAL ASSOCIATION, as Administrative Agent and as a Lender

By: /s/ Frederick H. Denecke

Name:Frederick H. Denecke    

Title:Senior Vice President    

[Signatures Continued Next Page]

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[Signature Page to Term Loan Agreement with Corporate Office Properties, L.P.]

PNC BANK, NATIONAL ASSOCIATION

By:/s/ Katie Chowdhry

Name: Katie Chowdhry    

Title: Assistant Vice President    

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[Signature Page to Term Loan Agreement with Corporate Office Properties, L.P.]

REGIONS BANK

By: /s/ Kyle D. Upton

Name: Kyle D. Upton    

Title: Vice President    

LEGAL02/36006473v7    

[Signature Page to Term Loan Agreement with Corporate Office Properties, L.P.]

U.S. BANK NATIONAL ASSOCIATION

as a Lender

By: /s/ Gary D. Houston

Name: Gary D. Houston    

Title: Vice President    

LEGAL02/36006473v7    

[Signature Page to Term Loan Agreement with Corporate Office Properties, L.P.]

TD BANK, N.A.

By: /s/ Michael Dugonich

Name: Michael Dugonich    

Title: Vice President    

LEGAL02/36006473v7    

[Signature Page to Term Loan Agreement with Corporate Office Properties, L.P.]

MANUFACTURERS AND TRADERS TRUST COMPANY

By: /s/ Isidoros Roros

Name:Isidoros Roros    

Title: Vice President    

LEGAL02/36006473v7    

[Signature Page to Term Loan Agreement with Corporate Office Properties, L.P.]

BRANCH BANKING AND TRUST COMPANY

By: /s/ Glenn A. Page

Name: Glenn A. Page    

Title: Senior Vice President    

LEGAL02/36006473v7    

SCHEDULE I

Commitments

Lender	Commitment
Capital One, National Association	$75,000,000
PNC Bank, National Association	$50,000,000
Regions Bank	$50,000,000
U.S. Bank National Association	$25,000,000
TD Bank, N.A.	$25,000,000
Manufacturers and Traders Trust Company	$15,000,000
Branch Banking and Trust Company	$10,000,000
TOTAL	$250,000,000

LEGAL02/36006473v7

SCHEDULE 1.1(A)

List of Loan Parties

Name	Jurisdiction of Formation	Jurisdictions of Foreign Qualification
Borrower
Corporate Office Properties, L.P.	Delaware	Maryland, New Jersey, Pennsylvania, Virginia, Alabama and District of Columbia
Parent
Corporate Office Properties Trust	Maryland	Pennsylvania

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
W&M Business Trust	Maryland	Corporate Office Properties, L.P.	Sole Shareholder & Trustee	100%
2500 Riva Trust	Maryland	Riva Trustee, LLC	Sole Trustee	100%
8027 Corporate Drive Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
COPT Babcock Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Campbell Boulevard Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Campbell Boulevard I Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Campbell Boulevard II Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Campbell Corporate Center I-2 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Corporate Place I Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Corporate Place III Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Corporate Place IV Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Franklin Ridge No. 1 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Franklin Ridge No. 2 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Franklin Ridge No. 3 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Franklin Ridge No. 4 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Franklin Ridge V Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Franklin Ridge Open Space Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Lot 401 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
McLean Ridge I Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
McLean Ridge II Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
McLean Ridge III Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
McLean Ridge IV Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Nottingham Ridge I Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
		W & M Business Trust	Sole Shareholder	100%
Nottingham Ridge II Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Nottingham Ridge III Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Nottingham Ridge No. 20 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Nottingham Ridge No. 30 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Philadelphia Road Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Tyler Ridge I Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		Tyler Ridge Limited Parnership	Sole Shareholder	100%
Tyler Ridge II Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Tyler Ridge II A Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Tyler Ridge Water Management Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
White Marsh Business Center 2 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
White Marsh Hi-Tech 1 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
White Marsh Hi-Tech 2 Business Trust	Maryland	Corporate Office Properties, L.P.	Trustee
		W & M Business Trust	Sole Shareholder	100%
Limited & General Partnerships
Blue Bell Investment Company, L.P.	Delaware	Corporate Office Properties Holdings, Inc.	General Partner	0.10%
		Corporate Office Properties, L.P.	Limited Partner	99.99%
Colgatedrive Associates, L.P.	Pennsylvania	COPT Colgate General, LLC,	General Partner	0.10%
		Corporate Office Properties, L.P.	Limited Partner	99.99%
Corporate Center I Limited Partnership	Maryland	Corporate Office Properties, L.P.	Limited Partner
		W & M Business Trust	Limited Partner
Corporate Office Properties, L.P.	Delaware	Corporate Office Properties Trust	General Partner
		See Partnership documents	Limited Partners
COPT 8000 Potranco, L.P.	Texas	COPT San Antonio General, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT 8030 Potranco, L.P.	Texas	COPT San Antonio General, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT 8100 Potranco, L.P.	Texas	COPT San Antonio General, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
COPT Gateway, LP	Delaware	Corporate Office Properties Holdings, Inc.	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT Harrisburg, L.P.	Maryland	COPT Harrisburg GP, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT Pennlyn, L.P.	PA	Corporate Office Properties Holdings, Inc.	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT San Antonio , L.P.	Texas	COPT San Antonio General, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT San Antonio II, L.P.	Texas	COPT San Antonio General, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT SA Technology Center, L.P.	Texas	COPT San Antonio General, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT Sentry Gateway 100, L.P.	Texas	COPT San Antonio General, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT Westpointe 3A, L.P.	Texas	COPT San Antonio General, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
COPT Westpointe 4, L.P.	Texas	COPT San Antonio General, LLC	General Partner	1%
		Corporate Office Properties, L.P.	Limited Partner	99%
Tyler Ridge Limited Partnership	Maryland	Tyler Ridge I, LLC	General Partner	1%
		W & M Business Trust	Limited Partner	99%
White Marsh Business Center Limited Partnership	Maryland	White Marsh Business Center, LLC	General Partner	1%
		W & M Business Trust	Limited Partner	99%
Corporations
Corporate Office Management, Inc.	Maryland	Corporate Office Properties, L.P.	sole stockholder	100%
Corporate Office Properties Holdings, Inc.	Delaware	Corporate Office Properties Trust	sole stockholder	100%
COPT Acquisitions, Inc.	Delaware	Corporate Office Properties Trust	sole stockholder	100%
Nottingham Ridge Holding Corp.	Maryland	Corporate Office Properties Trust	sole shareholder	100%
Nottingham Commons I Holding Corp.	Maryland	Corporate Office Properties, L.P.	stockholder	99.00%
		John Hermann	stockholder	1.00%
Nottingham Commons II Holding Corp.	Maryland	Corporate Office Properties, L.P.	stockholder	99.00%
		Catherine M. Ward	stockholder	1.00%
Limited Liability Companies
ASI, LLC	Maryland	Airport Square Holdings I, LLC	Sole Member	100%
Aerotech Manager, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square, LLC	Maryland	Corporate Office Properties, L.P.	Member	70%
		Airport Square Partners, LLC	Member	30%
Airport Square II, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square IV, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
Airport Square V, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square X, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square XI, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square XIII, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square XIV, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square XV, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square XIX, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square XX, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square XXI, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square XXII, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square Holdings I, LLC	Delaware	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square Holdings VI and VII, LLC	Delaware	Airport Square Partners, LLC	Sole Member	100%
Airport Square Partners, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Airport Square Storms, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
AP#5 Lot A, LLC	Maryland	COPT-Kirk AP#5, LLC	sole member	100%
AP#5 Lot B, LLC	Maryland	COPT-Kirk AP#5, LLC	sole member	100%
AP#5 Lot C, LLC	Maryland	COPT-Kirk AP#5, LLC	sole member	100%
Arundel Preserve #5, LLC	Maryland	COPT-Kirk AP#5, LLC	sole member	100%
Atrium Building, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Canton Crossing Retail, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Clarks Hundred, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Clarks Hundred II, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Colorado Land Acquisition, LLC	Colorado	Corporate Office Properties, L.P.	Sole Member	100%
Columbia Equity Finance, LLC	Maryland	One Sellner Road, LLC	Sole Member	100%
Columbia Gateway S-28, L.L.C.	Maryland	Corporate Office Properties, L.P.	sole Member	100%
COMI Investments, LLC	Maryland	Corporate Office Management, Inc.	Sole Member	100%
Commons Office Research, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Commons Office 6-B, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
Concourse 1304, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
COPT Academy Ridge, LLC	Colorado	Corporate Office Properties, L.P.	Sole Member	100%
COPT Aberdeen, LLC	Maryland	Corporate Office Properties, L.P.	Sole Member	100%
COPT Aerotech, LLC	Colorado	Corporate Office Properties, L.P.	Member	99.5%
		Aerotech Manager	Member	0.5%
COPT AP 9, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Arundel Preserve, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Baltimore County I, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Baltimore County II, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Bridge Street Office, LLC	Alabama	Corporate Office Properties, L.P.	sole member	100%
COPT Brock Bridge, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT CC 1600, LLC	Maryland	Corporate Office Properties, L.P.	sole Member	100%
COPT CC Bulkhead, LLC	Maryland	COPT CC Holding, LLC	sole member	100%

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
COPT CCW I, LLC	Maryland	COPT CC Holding, LLC	sole member	100%
COPT CCW II, LLC	Maryland	COPT CC Holding, LLC	sole member	100%
COPT CCW III, LLC	Maryland	COPT CC Holding, LLC	sole member	100%
COPT CC D1, LLC	Maryland	COPT CC Holding, LLC	sole member	100%
COPT CC Holding, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT CC Parking, LLC	Maryland	COPT CC Holding, LLC	sole member	100%
COPT CC Tower, LLC	Maryland	COPT CC Holding, LLC	sole member	100%
COPT Chantilly, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Chantilly II, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Chantilly I Manager, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Chantilly II Manager, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Colgate General, LLC	Delaware	Corporate Office Properties, L.P.	member	99.99%
		Corporate Office Properties Holdings, Inc.	member	0.01%
COPT Concourse, LLC	Delaware	Corporate Office Properties, L.P.	sole member	100%
COPT Connect, LLC	Virginia	Corporate Office Management, Inc.	sole member	100%
COPT Cresterra 3535, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Cresterra Master, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Dahlgren, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Dahlgren I, LLC	Virginia	Corporate Office Properties Holdings, Inc.	member	0.01%
		Corporate Office Properties, L.P.	member	99.99%
COPT Dahlgren II, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Dahlgren IV, LLC	Virginia	Corporate Office Properties Holdings, Inc.	member	0.01%
		Corporate Office Properties, L.P.	member	99.99%
COPT Dahlgren Land, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Data Management, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT DC-6, LLC	Delaware	Powerloft Holdings, LLC	sole member	100%
COPT DC-8, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT DC-11, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT DC-12, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT DC-15, LLC	Virginia	CDECRE, LLC	sole member	100%
COPT Development & Construction Services, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Fairview, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Frederick, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Gate 63, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Gate 6700-6708-6724, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Gateway Commerce, LLC	Delaware	Corporate Office Properties, L.P.	sole member	100%
COPT General, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Greens I, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Greens II, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Greens III, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Harbour's Edge, LLC	Maryland	COPT CC Holding, LLC	sole member	100%
COPT Harrisburg GP, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
COPT Huntsville, LLC	Maryland	Huntsville Holdings, LLC	sole member	100%
COPT Interquest, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Interquest III, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Interquest IV, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Interquest Epic I, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Interquest Hybrid I, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Interquest Hybrid II, LLC	Colorado	Corporate Office Properties, L.P.	sole Member	100%
COPT-Kirk AP#5, LLC	Maryland	COPT Arundel Preserve, LLC	sole member	100%
COPT Maritime I & II, LLC	Delaware	Maritime Holdings, LLC	sole member	100%
COPT McLearen, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Metro Place II, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Newport C, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Newport D, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Northcreek, LLC	Colorado	Corporate Office Properties, L.P.	member	99.50%
		Northcreek Manager, LLC	member	0.50%
COPT Northgate A, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Northgate B, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Northgate C, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Northgate D, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Northgate H, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Northgate I, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Opportunity Invest I, LLC (JV)	Maryland	Corporate Office Management, Inc.	sole member	100%
COPT Powerhouse, LLC	Maryland	COPT CC Holding, LLC	sole member	100%
COPT Park Meadow, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Parkstone, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Patriot Park I, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Patriot Park II, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Patriot Park V, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Patriot Park VI, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Patriot Park VII, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Patriot Park at Galley, LLC	Colorado	Corporate Office Properties, L.P.	sole member	100%
COPT Pres Investment, LLC	Maryland	Corporate Office Management, Inc.	sole member	100%
COPT Property Management Services, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Renovation, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Richmond I, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Ridgeview I, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Ridgeview II & III, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Riverwood, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT San Antonio General, LLC	Texas	Corporate Office Properties, L.P.	sole member	100%
COPT Southwest VA, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Stevens Place, LLC	Delaware	Corporate Office Properties, L.P.	sole member	100%
COPT Sunrise, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Stonecroft, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
COPT T-11, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
COPT Virtru, LLC	Maryland	Corporate Office Management, Inc.	sole member	100%
COPT Waterview I, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Waterview III, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
COPT Westbranch, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
Cornucopia Holdings, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Cornucopia Holdings II, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Corporate Center I, LLC	Maryland	W & M Business Trust	sole member	100%
Corporate Development Services, LLC	Maryland	Corporate Office Management, Inc.	sole member	100%
Corporate Gatespring, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Corporate Gatespring II, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Corporate Office Services, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Corporate Paragon, LLC	Maryland	Corporate Office Management, Inc.	sole member	100%
Corporate Place B Equity Affiliates, LLC	Maryland	W & M Business Trust	sole member	100%
Corporate Property, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Crown Point, L.L.C.	Delaware	Corporate Office Properties, L.P.	member	99.99%
		Corporate Office Properties Holdings, Inc.	member	0.01%
Delaware Airport III, LLC	Delaware	Airport Square Partners, LLC	sole member	100%
Delaware Airport VIII, LLC	Delaware	Airport Square Partners, LLC	sole member	100%
Delaware Airport IX, LLC	Delaware	Airport Square Partners, LLC	sole member	100%
Enterprise Campus Developer, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Fifth Exploration, L.L.C.	Maryland	Great Mills V, L.L.C.	sole member	100%
Fourth Exploration, L.L.C.	Maryland	Great Mills V, L.L.C.	sole member	100%
Gateway Crossing 95, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Gateway 44, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Gateway 67, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Gateway 70, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Gateway 70 Holdings, LLC	Maryland	Gateway 70, LLC	sole member	100%
Great Mills I, L.L.C.	Delaware	Corporate Office Properties, L.P.	sole member	100%
Great Mills II, L.L.C.	Delaware	Corporate Office Properties, L.P.	sole member	100%
Great Mills III, L.L.C.	Delaware	Corporate Office Properties, L.P.	sole member	100%
Great Mills IV, L.L.C.	Delaware	Corporate Office Properties, L.P.	sole member	100%
Great Mills V, L.L.C.	Delaware	Corporate Office Properties, L.P.	sole member	100%
Honeyland 108, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Huntsville Holdings, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Jolly COPT I, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Jolly COPT II, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
LW Redstone Company, LLC (JV)	Delaware	COPT Huntsville, LLC	member	85%
		Tri-W Huntsville, LLC	member	15%
Maritime Holdings, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
M Square Associates, LLC (JV)	Maryland	M Square Research Park, LLC	member	50%
		Enterprise Campus Developer, LLC	member	50%
M Square NOAA, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
M Square 5825, LLC (JV)	Maryland	M Square Associates, LLC	sole member	100%
M Square 5850, LLC (JV)	Maryland	M Square Associates, LLC	sole member	100%
MOR Forbes, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP One, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP Huff & Puff, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP Lot 3-A, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP Retail, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 131, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 132, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 133, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 134, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 135, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 140, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 141, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 191, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 201, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 201 Holdings, LLC	Maryland	NBP 201, LLC	sole member	100%
NBP 211, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 211 Holdings, LLC	Maryland	NBP 211, LLC	sole member	100%
NBP 220, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 220 Holdings, LLC	Maryland	NBP 220, LLC	sole member	100%
NBP 221, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 300, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 300 Restaurant, LLC	Maryland	Corporate Office Management, Inc.	sole member	100%
NBP 302, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 304, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 306, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 308, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 310, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 312, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 314, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 316, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 318, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 320, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 322, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 324, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 410, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 420, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 430, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 520, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
NBP 540, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Northcreek Manager, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
One Sellner Road, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
Park Circle Equities, LLC	Maryland	W & M Business Trust	sole member	100%
Patriot Park, L.L.C.	Colorado	Corporate Office Properties, L.P.	sole member	100%
Patriot Ridge I, LLC	Virginia	Patriot Ridge Holdings, LLC	sole member	100%
Patriot Ridge II, LLC	Virginia	Patriot Ridge Holdings, LLC	sole member	100%
Patriot Ridge Commons, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
Patriot Ridge Holdings, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
Patriot Ridge 7770, LLC	Virginia	Corporate Office Properties, L.P.	sole member	100%
Pecan Court L.L.C.	Maryland	Great Mills II, L.L.C.	sole member	100%
Powerloft Holdings, LLC	Delaware	Corporate Office Properties, L.P.	sole member	100%
Red Cedar Building, LLC	Maryland	Great Mills I, L.L.C.	sole member	100%
Redstone Gateway 1000, LLC	Delaware	LW Redstone Company, LLC	sole member	100%
Redstone Gateway 1100, LLC	Delaware	LW Redstone Company, LLC	sole member	100%
Redstone Gateway 1200, LLC	Delaware	LW Redstone Company, LLC	sole member	100%
Redstone Gateway 2100, LLC	Delaware	LW Redstone Company, LLC	sole member	100%
Redstone Gateway 6500, LLC	Delaware	LW Redstone Company, LLC	sole member	100%
Redstone Gateway 7200, LLC	Delaware	LW Redstone Company, LLC	sole member	100%
RG 2100 Restaurant, LLC	Maryland	Corporate Office Management, Inc.	sole member	100%
RIVA Trustee, LLC	Maryland	MOR Forbes, LLC	sole member	100%
Riverwood Business Center Equity Affiliates, LLC	Maryland	W & M Business Trust	sole member	100%
Tech Park I, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Tech Park II, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Tech Park IV, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
Third Exploration L.L.C.	Maryland	Great Mills III, L.L.C.	sole member	100%
TRC Pinnacle Towers, L.L.C.	Virginia	Corporate Office Properties, L.P.	sole member	100%
Tyler Ridge I, LLC	Maryland	W & M Business Trust	sole member	100%
White Marsh Business Center, LLC	Maryland	W & M Business Trust	sole member	100%
WMBC 13A Investment Company, LLC	Maryland	Tyler Ridge Limited Partnership	sole member	100%
30 Charm City, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
30 LS Borrower, LLC	Maryland	30 Charm City, LLC	sole member	100%
67 Financing LLC	Maryland	Gateway 67, LLC	sole member	100%
100 Charm City, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
100 LS Borrower, LLC	Maryland	100 Charm City, LLC	sole member	100%
110 Thomas Johnson, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
131 Parkway, LLC	Maryland	NBP 131, LLC	sole member	100%
133 Parkway, LLC	Maryland	NBP 133, LLC	sole member	100%
134, LLC	Maryland	NBP 134, LLC	sole member	100%
135 Parkway, LLC	Maryland	NBP 135, LLC	sole member	100%
141 Parkway, LLC	Maryland	NBP 141, LLC	sole member	100%
250 Charm City, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
302 Sentinel, LLC	Maryland	NBP 302, LLC	sole member	100%
304 Sentinel, LLC	Maryland	NBP 304, LLC	sole member	100%
306 Sentinel, LLC	Maryland	NBP 306, LLC	sole member	100%
318 Sentinel, LLC	Maryland	NBP 318, LLC	sole member	100%

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
320 Sentinel, LLC	Maryland	NBP 320, LLC	sole member	100%
322 Sentinel, LLC	Maryland	NBP 322, LLC	sole member	100%
800 International, LLC	Maryland	Tech Park IV, LLC	sole member	100%
849 International, LLC	Maryland	Airport Square XXI, LLC	sole member	100%
881 Elkridge Landing, LLC	Maryland	Airport Square X, LLC	sole member	100%
900 International, LLC	Maryland	Tech Park II, LLC	sole member	100%
930 International, LLC	Maryland	Tech Park I, LLC	sole member	100%
999 Corporate, LLC	Maryland	Airport Square XV, LLC	sole member	100%
1099 Winterson, LLC	Maryland	Airport Square XIX, LLC	sole member	100%
1190 Winterson, LLC	Maryland	Airport Square XIV, LLC	sole member	100%
1199 Winterson, LLC	Maryland	Airport Square XX, LLC	sole member	100%
1362 Mellon, LLC	Maryland	Commons Office 6-B, LLC	sole member	100%
1460 Dorsey Road, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
1550 Nursery, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
2691 Technology, LLC	Maryland	NBP 191, LLC	sole member	100%
2701 Technology, LLC	Maryland	NBP 201, LLC	sole member	100%
2711 Technology, LLC	Maryland	NBP 211, LLC	sole member	100%
2720 Technology, LLC	Maryland	NBP 220, LLC	sole member	100%
2730 Hercules, LLC	Maryland	NBP One, LLC	sole member	100%
5825 URC Borrower, LLC	Maryland	M Square 5825, LLC	sole member	100%
5850 URC Borrower, LLC	Maryland	M Square 5850, LLC	sole member	100%
6700 Alexander Bell, LLC	Maryland	COPT Gate 6700-6708-6724, LLC	sole member	100%
6711 Gateway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
6711 Gateway Funding, LLC	Maryland	Corporate Office Properties, L.P.	member	99%
		Corporate Office Properties Trust	member	1%
6721 Gateway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
6721 CGD, LLC	Maryland	6721 Gateway, LLC	sole member	100%
6731 Gateway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
6741 Gateway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
6940 CGD,LLC	Maryland	Corporate Gatespring II, LLC	sole member	100%
6950 CG, LLC	Maryland	Corporate Gatespring, LLC	sole member	100%
7000 CG, LLC	Maryland	7000 Honeys, LLC	sole member	100%
7000 Honeys, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7005 Columbia Gateway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7015 Albert Einstein Drive, L.L.C.	Maryland	Corporate Office Properties, L.P.	sole member	100%
7130 Columbia Gateway, LLC	Maryland	Gateway Crossing 95, LLC	sole member	100%
7150-70 Riverwood, LLC	Maryland	Riverwood Business Center Equity Affiliates, LLC	sole member	100%
7200 Riverwood, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7205 Riverwood, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7240 Parkway Drive Enterprises, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7318 Parkway Drive Enterprises, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7320 Parkway Drive Enterprises, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7320 PD, LLC	Maryland	7320 Parkway Drive Enterprises, LLC	sole member	100%

LEGAL02/36006473v7

SCHEDULE 6.1(B) PART I
OWNERSHIP STRUCTURE - ALL SUBSIDIARIES
Current as of 12/10/15
Name	Jurisdiction	Person Holding an Equity Interest	Nature of Interests Held	Percentage Ownership
Business Trusts
7740 Milestone, LLC	Maryland	Arundel Preserve #5, LLC	sole member	100%
7760 Milestone Parkway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7780 Milestone Parkway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7874 Milestone Parkway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7876 Milestone Parkway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7878 Milestone Parkway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
7880 Milestone Parkway, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
8621 RFD, LLC	Maryland	Gateway 70, LLC	sole member	100%
8661 RFD, LLC	Maryland	Gateway 67, LLC	sole member	100%
9690 Deereco Road, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%
45310 Abell House, LLC	Maryland	Corporate Office Properties, L.P.	sole member	100%

LEGAL02/36006473v7

Schedule 6.1(b) Part 2
Unconsolidated Affiliates
Name	Type of Legal Entity	Nature of Interests Held
BDCP Sky LLC	Limited Liability Company	Member
BDCP Vision LLC	Limited Liability Company	Member

LEGAL02/36006473v7

Schedule 6.1(f) Part I - All Real Property
As of December 17, 2015
Address	Square Feet
Unencumbered Wholly Owned Operating Properties
7700 Potranco Road	533,468
1501 S Clinton St	480,288
7125 Columbia Gateway Drive	433,375
250 W Pratt St	364,594
1751 Pinnacle Drive	258,260
7770 Backlick Road	239,272
2600 Park Tower Drive	237,023
15395 John Marshall Highway	233,768
801 Lakeview Drive	216,669
1201 M Street	202,185
13857 McLearen Road	201,837
21271 Smith Switch Road	200,000
300 Sentinel Drive-NBP300	193,296
11751 Meadowville Lane	193,000
1753 Pinnacle Drive	184,480
721 Arbor Way	183,383
3120 Fairview Drive	183,067
9140 Rt.108	171,436
304 Sentinel Drive-NBP304	162,330
1550 West Nursery Road	161,689
8100 Potranco Road	160,561
7200 Riverwood Drive	160,000
4850 Stonecroft Boulevard	159,300
2720 Technology Drive-NBP220	158,786
1220 12th Street SE	157,895
2500 Riva Road	155,000
302 Sentinel Drive-NBP302	152,598
308 Sentinel Drive-NBP308	151,207
2900 Towerview Road	150,644
15059 Conference Center Drive	146,752
15049 Conference Center Drive	145,675
7000 Columbia Gateway Drive	145,386
731 Arbor Way	140,601
420 Natl Business Pkwy-NBP420	139,056
310 The Bridge Street	137,048
9690 Deereco Road	134,950
206 Research Blvd	128,119
318 Sentinel Way-NBP318	125,635
320 Sentinel Way-NBP320	125,325
14900 Conference Center Drive	125,221
312 Sentinel Way-NBP312	125,160
8000 Potranco Road	125,157
8030 Potranco Road	125,155
316 Sentinel Way-NBP316	125,150
324 Sentinel Way-NBP324	125,118

LEGAL02/36006473v7

Schedule 6.1(f) Part I - All Real Property
As of December 17, 2015
Address	Square Feet
6711 Columbia Gateway Drive	123,136
6731 Columbia Gateway Drive	122,917
21263 Smith Switch Road	120,666
140 Natl Business Pkwy-NBP140	119,466
132 Natl Business Pkwy-NBP132	118,008
2721 Technology Drive-NBP221	116,988
1306 Concourse Drive	115,576
751 Arbor Way	113,295
14280 Park Meadow Drive	112,916
6950 Columbia Gateway Drive	112,861
13454 Sunrise Valley Road	112,043
430 Natl Business Pkwy-NBP430	110,136
410 Natl Business Pkwy-NBP410	110,052
21267 Smith Switch Road	109,997
6940 Columbia Gateway Drive	108,652
870-880 Elkridge Landing Road	105,456
375 West Padonia Road	104,885
2691 Technology Drive-NBP191	103,422
5520 Research Pk Dr(UMBC)	103,333
201 Technology Drive	102,842
900 Elkridge Landing Road	101,005
1304 Concourse Drive	100,319
22309 Exploration Drive	98,860
134 Natl Business Pkwy-NBP134	92,173
7205 Riverwood Drive	89,268
4851 Stonecroft Boulevard	88,099
133 Natl Business Pkwy-NBP133	86,937
7067 Columbia Gateway Drive	85,393
8621 Robert Fulton Drive	83,734
1302 Concourse Drive	83,717
45310 Abell House Lane	82,829
210 Research Blvd	79,596
8110 Corporate Drive	79,091
209 Research Blvd	78,037
8140 Corporate Drive	76,439
6700 Alexander Bell Drive	76,358
6750 Alexander Bell Drive	75,327
1560B Cable Ranch Road	74,119
7467 Ridge Road	73,694
14840 Conference Center Drive	72,248
14850 Conference Center Drive	70,757
16480 Commerce Drive	69,769
131 Natl Business Pkwy-NBP131	69,375
911 Elkridge Landing Road	68,373
6740 Alexander Bell Drive	63,161
7160 Riverwood Drive	62,238

LEGAL02/36006473v7

Schedule 6.1(f) Part I - All Real Property
As of December 17, 2015
Address	Square Feet
46591 Expedition Drive	59,843
7318 Parkway Drive	59,204
46579 Expedition Drive	59,004
44425 Pecan Court	58,651
22289 Exploration Drive	58,632
22299 Exploration Drive	58,491
891 Elkridge Landing Road	57,982
901 Elkridge Landing Road	57,872
7320 Parkway Drive	56,964
938 Elkridge Landing Road	56,270
8671 Robert Fulton Drive	55,688
939 Elkridge Landing Road	54,235
13450 Sunrise Valley Road	52,990
6716 Alexander Bell Drive	51,816
8020 Corporate Drive	50,796
4940 Campbell Boulevard	49,880
44408 Pecan Court	49,808
8094 Sandpiper Circle	49,585
8661 Robert Fulton Drive	48,666
23535 Cottonwood Parkway	46,656
8098 Sandpiper Circle	46,485
7142 Columbia Gateway Drive	46,339
1560A Cable Ranch Road	45,935
7130 Columbia Gateway Drive	45,882
1340 Ashton Road	45,867
22300 Exploration Drive	45,093
1362 Mellon Road	43,232
8007 Corporate Drive	41,798
7150 Riverwood Drive	39,496
7065 Columbia Gateway Drive	38,560
8010 Corporate Drive	38,487
7138 Columbia Gateway Drive	38,285
1334 Ashton Road	37,304
16541 Commerce Drive	37,293
7063 Columbia Gateway Drive	36,296
6760 Alexander Bell Drive	36,228
5355 Nottingham Ridge Road	35,930
5325 Nottingham Ridge Road	35,678
7150 Columbia Gateway Drive	34,734
8019 Corporate Drive	32,424
16539 Commerce Drive	32,257
8013 Corporate Drive	29,995
7061 Columbia Gateway Drive	29,890
1331 Ashton Road	28,907
6724 Alexander Bell Drive	28,121
7170 Riverwood Drive	27,891

LEGAL02/36006473v7

Schedule 6.1(f) Part I - All Real Property
As of December 17, 2015
Address	Square Feet
7175 Riverwood Drive	25,939
16442 Commerce Drive	25,606
44420 Pecan Court	25,338
44414 Pecan Court	24,894
5522 Research Pk Dr(UMBC)	23,925
16501 Commerce Drive	22,429
8003 Corporate Drive	18,106
16543 Commerce Drive	17,287
8015 Corporate Drive	15,669
1341 Ashton Road	15,314
114 Natl Business Pkwy-NBP114	10,113
1343 Ashton Road	9,903
8023 Corporate Drive	9,486
San.Antonio Vis.Control	8,674
6741 Columbia Gateway Drive	4,592
NBP Visitor Control Ctr	4,462
525 Babcock Road	—
9651 Hornbaker Road	—
Encumbered Wholly Owned Operating Properties
135 Natl Business Pkwy-NBP135	86,990
141 Natl Business Pkwy-NBP141	87,276
2701 Technology Drive-NBP201	116,885
2711 Technology Drive-NBP211	152,097
2730 Hercules Road-NBP1	238,007
306 Sentinel Drive-NBP306	153,536
322 Sentinel Way-NBP322	125,487
6721 Columbia Gateway Drive	131,451
7015 Albert Einstein Drive	62,216
7740 Milestone Parkway	146,666
7272 Park Circle Drive	60,347
100 Light Street	497,504
30 Light Street	9,825
Unencumbered Under Construction/Development
14091 Conference Center Drive
4870 Stonecroft Boulevard
7880 Milestone Parkway
7060 Wellington Road
7070 Wellington Road
310 Sentinel Way-NBP310
520 National Business Parkway
540 National Business Parkway
560 National Business Parkway
Beumeade Land (DC 15,16 & 17)

LEGAL02/36006473v7

Schedule 6.1(f) Part I - All Real Property
As of December 17, 2015
Address	Square Feet
Unencumbered Land
Aerotech 2 (Newport D)
Arundel Preserve Parcel 5
Arundel Preserve Parcel 7
Arundel Preserve Parcel 8
Arundel Preserve Parcel 9
Arundel Off-Site Infra.
Babcock Land
7750 Backlick Road
7800 Backlick Road
7005 Columbia Gateway Drive
7055 Columbia Gateway Drive
7059 Columbia Gateway Drive
Dahlgren Land Parcel
8120 Corporate Drive
8130 Corporate Drive
1050 Democracy
1460 Dorsey Road
940 Elkridge Landing Road
Expedition VII(parcel#2)
0 Galley Road
605 Guardian Way
610 Guardian Way
Interquest land parcel
7874 Milestone Parkway
North Gate Retail B2
Nottingham Ridge
Nottingham Rid&Philadel
Westfields - Park Center
Patriot Park
Patriot Ridge
Philadelphia Road & Rt 43
202 Research Blvd-Lot H
Other Canton Crossing
598 Stenton Avenue
Thatcher Farm Land Parcel
7086 Wellington Road
Westfields Corporate Center
1243 Winterson Road
Woodland Park
Cedar Knolls Master Plan
Clarks 100

LEGAL02/36006473v7

Schedule 6.1(f) Part I - All Real Property
As of December 17, 2015
Address	Square Feet
Other North Gate	0
Other San Antonio	0
7125 Columbia Gateway Land
785 Jolly Road	0
Unencumbered Properties - Re - Development (COPT Controlled Properties)
731 Arbor Way
44417 Pecan Court
921 Elkridge Landing Road
1201 Winterson Road
6708 Alexander Bell Drive
7134 Columbia Gateway Drive
JV - Unencumbered Operational Controlled
6500 Redstone Gateway	0
JV - Encumbered Operational Controlled
1000 Redstone Gateway	121,105
1200 Redstone Gateway	121,088
1100 Redstone Gateway	121,111
7200 Redstone Gateway	131,498
JV - Unencumbered Properties - Under Construction Controlled
2100 Rideout Road	—
1600 Rideout Rd. Retail	—
JV - Unencumbered Properties - Development/Land Controlled
Other Redstone Gateway
3400 Redstone Gateway
4100 Market Street
6100 Redstone Gateway
7000 Redstone Gateway
JV - Encumbered Operational Non-Controlled
5825 University Research Court	118,621
5850 University Research Court	123,449
JV - Unencumbered Properties - Development/Land Non-controlled
4400 River Road
4500 River Road
4600 River Road
M Square Associates
M Square Litton Building
5801 University Research CT-JV

LEGAL02/36006473v7

Schedule 6.1(f) Part II - Real Property Liens
As of December 17, 2015
Wholly-Owned Properties	Rentable SF
State Farm - Matures 9/1/16
7272 Park Circle Drive	60,347
Teachers Insurance and Annuity Association (TIAA) - Matures 10/1/16
2730 Hercules Road	238,007
135 National Business Parkway	86,990
141 National Business Parkway	87,276
306 Sentinel Drive	153,536
322 Sentinel Drive	125,487
2701 Technology Drive	116,885
2711 Technology Drive	152,097
6721 Columbia Gateway Drive	131,451
State Farm - Matures 11/1/19
7015 Albert Einstein Drive	62,216
PNC - Matures 2/1/23
7740 Milestone Parkway	146,666
Northwestern Mutual - Matures 6/15/23
100 Light Street	497,504
30 Light Street	9,825
Joint Venture Properties
Wells Fargo - Matures 5/2/16
5825 University Research Blvd.	118,621
5850 University Research Blvd.	123,449
M&T Bank - Matures 10/1/20
7200 Redstone Gateway	131,498
State Farm - Matures 6/1/24
1000 Redstone Gateway	121,105
State Farm - Matures 6/1/24
1100 Redstone Gateway	121,111
State Farm - Matures 6/1/24
1200 Redstone Gateway	121,088

LEGAL02/36006473v7

Schedule 6.1(g) Indebtedness and Guaranties
As of December 17 , 2015
Loan		JV %	Recourse Guarantee Amount	Principal Balance	Secured/ Unsecured
$800M Revolver	1)			43,000,000	U
$300M Term Loan				300,000,000	U
$120M Term Loan				120,000,000	U
$400M Term Loan	2)			100,000,000	U
3.60% Senior Unsecured Notes				350,000,000	U
3.70% Senior Unsecured Notes				300,000,000	U
5.25% Senior Unsecured Notes				250,000,000	U
5.00% Senior Unsecured Notes				300,000,000	U
MDE Note (CC Bulkhead)				1,781,120	U
				1,764,781,120
State Farm (7015 Albert Einstein)				1,570,326	S
State Farm (7272 Park Circle)				4,746,828	S
PNC (Arundel Preserve)				18,986,744	S
Northwestern Mutual				55,000,000	S
TIAA - $185				164,596,398	S
				244,900,296
Add: Pro Rata Share of JV Debt
State Farm - 1100 Redstone Gateway	3)	85%	11,836,496	11,836,496	S
State Farm - 1000 Redstone Gateway	3)	85%	11,370,442	11,370,442	S
State Farm - 1200 Redstone Gateway	3)	85%	13,638,866	13,638,866	S
M&T Bank - 7200 Redstone Gateway	3)	85%	13,941,170	13,941,170	S
Wells Fargo (MSquare)	3)	50%	36,026,046	36,026,046	S
				86,813,020
Add: Letters of Credit
TIAA (Release of 3535 NG)				14,780,830	U
NOVEC (DC-6)				1,666,311	U
Fairfax County, VA (COPT Stonecroft)				674,700	U
Fairfax County, VA (COPT Stonecroft)				359,000	U
Prince William County, VA (DC-12)				481,146	U
Prince William County, VA (DC-6)				139,362	U
Misc. Development Related				181,487	U
				18,282,836
Total Indebtedness:				$ 2,114,777,272
1) Outstanding Revolver Balance as of 12/9/15
2) This debt will be paid off w/initial loan proceeds from this new $250M Term Loan
3) COPLP providing full Payment Guaranty for this JV debt

LEGAL02/36006473v7

SCHEDULE 6.1(i)

Litigation

None

LEGAL02/36006473v7

Schedule 6.1(y) Unencumbered Assets
As of December 17, 2015
Address	Square Feet
Unencumbered Wholly Owned Operating Properties
7700 Potranco Road	533,468
1501 S Clinton St	480,288
7125 Columbia Gateway Drive	433,375
250 W Pratt St	364,594
1751 Pinnacle Drive	258,260
7770 Backlick Road	239,272
2600 Park Tower Drive	237,023
15395 John Marshall Highway	233,768
801 Lakeview Drive	216,669
1201 M Street	202,185
13857 McLearen Road	201,837
21271 Smith Switch Road	200,000
300 Sentinel Drive-NBP300	193,296
11751 Meadowville Lane	193,000
1753 Pinnacle Drive	184,480
721 Arbor Way	183,383
3120 Fairview Drive	183,067
9140 Rt.108	171,436
304 Sentinel Drive-NBP304	162,330
1550 West Nursery Road	161,689
8100 Potranco Road	160,561
7200 Riverwood Drive	160,000
4850 Stonecroft Boulevard	159,300
2720 Technology Drive-NBP220	158,786
1220 12th Street SE	157,895
2500 Riva Road	155,000
302 Sentinel Drive-NBP302	152,598
308 Sentinel Drive-NBP308	151,207
2900 Towerview Road	150,644
15059 Conference Center Drive	146,752
15049 Conference Center Drive	145,675
7000 Columbia Gateway Drive	145,386
731 Arbor Way	140,601
420 Natl Business Pkwy-NBP420	139,056
310 The Bridge Street	137,048
9690 Deereco Road	134,950
206 Research Blvd	128,119
318 Sentinel Way-NBP318	125,635
320 Sentinel Way-NBP320	125,325
14900 Conference Center Drive	125,221
312 Sentinel Way-NBP312	125,160
8000 Potranco Road	125,157
8030 Potranco Road	125,155
316 Sentinel Way-NBP316	125,150
324 Sentinel Way-NBP324	125,118

LEGAL02/36006473v7

Schedule 6.1(y) Unencumbered Assets
As of December 17, 2015
Address	Square Feet
6711 Columbia Gateway Drive	123,136
6731 Columbia Gateway Drive	122,917
21263 Smith Switch Road	120,666
140 Natl Business Pkwy-NBP140	119,466
132 Natl Business Pkwy-NBP132	118,008
2721 Technology Drive-NBP221	116,988
1306 Concourse Drive	115,576
751 Arbor Way	113,295
14280 Park Meadow Drive	112,916
6950 Columbia Gateway Drive	112,861
13454 Sunrise Valley Road	112,043
430 Natl Business Pkwy-NBP430	110,136
410 Natl Business Pkwy-NBP410	110,052
21267 Smith Switch Road	109,997
6940 Columbia Gateway Drive	108,652
870-880 Elkridge Landing Road	105,456
375 West Padonia Road	104,885
2691 Technology Drive-NBP191	103,422
5520 Research Pk Dr(UMBC)	103,333
201 Technology Drive	102,842
900 Elkridge Landing Road	101,005
1304 Concourse Drive	100,319
22309 Exploration Drive	98,860
134 Natl Business Pkwy-NBP134	92,173
7205 Riverwood Drive	89,268
4851 Stonecroft Boulevard	88,099
133 Natl Business Pkwy-NBP133	86,937
7067 Columbia Gateway Drive	85,393
8621 Robert Fulton Drive	83,734
1302 Concourse Drive	83,717
45310 Abell House Lane	82,829
210 Research Blvd	79,596
8110 Corporate Drive	79,091
209 Research Blvd	78,037
8140 Corporate Drive	76,439
6700 Alexander Bell Drive	76,358
6750 Alexander Bell Drive	75,327
1560B Cable Ranch Road	74,119
7467 Ridge Road	73,694
14840 Conference Center Drive	72,248
14850 Conference Center Drive	70,757
16480 Commerce Drive	69,769
131 Natl Business Pkwy-NBP131	69,375
911 Elkridge Landing Road	68,373

LEGAL02/36006473v7

Schedule 6.1(y) Unencumbered Assets
As of December 17, 2015
Address	Square Feet
6740 Alexander Bell Drive	63,161
7160 Riverwood Drive	62,238
46591 Expedition Drive	59,843
7318 Parkway Drive	59,204
46579 Expedition Drive	59,004
44425 Pecan Court	58,651
22289 Exploration Drive	58,632
22299 Exploration Drive	58,491
891 Elkridge Landing Road	57,982
901 Elkridge Landing Road	57,872
7320 Parkway Drive	56,964
938 Elkridge Landing Road	56,270
8671 Robert Fulton Drive	55,688
939 Elkridge Landing Road	54,235
13450 Sunrise Valley Road	52,990
6716 Alexander Bell Drive	51,816
8020 Corporate Drive	50,796
4940 Campbell Boulevard	49,880
44408 Pecan Court	49,808
8094 Sandpiper Circle	49,585
8661 Robert Fulton Drive	48,666
23535 Cottonwood Parkway	46,656
8098 Sandpiper Circle	46,485
7142 Columbia Gateway Drive	46,339
1560A Cable Ranch Road	45,935
7130 Columbia Gateway Drive	45,882
1340 Ashton Road	45,867
22300 Exploration Drive	45,093
1362 Mellon Road	43,232
8007 Corporate Drive	41,798
7150 Riverwood Drive	39,496
7065 Columbia Gateway Drive	38,560
8010 Corporate Drive	38,487
7138 Columbia Gateway Drive	38,285
1334 Ashton Road	37,304
16541 Commerce Drive	37,293
7063 Columbia Gateway Drive	36,296
6760 Alexander Bell Drive	36,228
5355 Nottingham Ridge Road	35,930
5325 Nottingham Ridge Road	35,678
7150 Columbia Gateway Drive	34,734
8019 Corporate Drive	32,424
16539 Commerce Drive	32,257
8013 Corporate Drive	29,995
7061 Columbia Gateway Drive	29,890
1331 Ashton Road	28,907

LEGAL02/36006473v7

Schedule 6.1(y) Unencumbered Assets
As of December 17, 2015
Address	Square Feet
6724 Alexander Bell Drive	28,121
7170 Riverwood Drive	27,891
7175 Riverwood Drive	25,939
16442 Commerce Drive	25,606
44420 Pecan Court	25,338
44414 Pecan Court	24,894
5522 Research Pk Dr(UMBC)	23,925
16501 Commerce Drive	22,429
8003 Corporate Drive	18,106
16543 Commerce Drive	17,287
8015 Corporate Drive	15,669
1341 Ashton Road	15,314
114 Natl Business Pkwy-NBP114	10,113
1343 Ashton Road	9,903
8023 Corporate Drive	9,486
San.Antonio Vis.Control	8,674
6741 Columbia Gateway Drive	4,592
NBP Visitor Control Ctr	4,462
525 Babcock Road	—
9651 Hornbaker Road	—
Unencumbered Under Construction/Development
14091 Conference Center Drive
4870 Stonecroft Boulevard
7880 Milestone Parkway
7060 Wellington Road
7070 Wellington Road
310 Sentinel Way-NBP310
520 National Business Parkway
540 National Business Parkway
560 National Business Parkway
Beumeade Land (DC 15,16 & 17)
Unencumbered Land
Aerotech 2 (Newport D)
Arundel Preserve Parcel 5
Arundel Preserve Parcel 7
Arundel Preserve Parcel 8
Arundel Preserve Parcel 9
Arundel Off-Site Infra.
Babcock Land
7750 Backlick Road
7800 Backlick Road
7005 Columbia Gateway Drive
7055 Columbia Gateway Drive

LEGAL02/36006473v7

Schedule 6.1(y) Unencumbered Assets
As of December 17, 2015
Address	Square Feet
7059 Columbia Gateway Drive
Dahlgren Land Parcel
8120 Corporate Drive
8130 Corporate Drive
1050 Democracy
1460 Dorsey Road
940 Elkridge Landing Road
Expedition VII(parcel#2)
0 Galley Road
605 Guardian Way
610 Guardian Way
Interquest land parcel
7874 Milestone Parkway
North Gate Retail B2
Nottingham Ridge
Nottingham Rid&Philadel
Westfields - Park Center
Patriot Park
Patriot Ridge
Philadelphia Road & Rt 43
202 Research Blvd-Lot H
Other Canton Crossing
598 Stenton Avenue
Thatcher Farm Land Parcel
7086 Wellington Road
Westfields Corporate Center
1243 Winterson Road
Woodland Park
Cedar Knolls Master Plan
Clarks 100
Other North Gate
Other San Antonio
7125 Columbia Gateway Land
785 Jolly Road
Unencumbered Properties - Re - Development (COPT Controlled Properties)
731 Arbor Way
44417 Pecan Court
921 Elkridge Landing Road
1201 Winterson Road
6708 Alexander Bell Drive

LEGAL02/36006473v7

Schedule 6.1(y) Unencumbered Assets
As of December 17, 2015
Address	Square Feet
7134 Columbia Gateway Drive
JV - Unencumbered Operational Controlled
6500 Redstone Gateway
JV - Unencumbered Properties - Under Construction Controlled
2100 Rideout Road
1600 Rideout Rd. Retail
JV - Unencumbered Properties - Development/Land Controlled
Other Redstone Gateway
3400 Redstone Gateway
4100 Market Street
6100 Redstone Gateway
7000 Redstone Gateway
JV - Unencumbered Properties - Development/Land Non-controlled
4400 River Road
4500 River Road
4600 River Road
M Square Associates
M Square Litton Building
5801 University Research CT-JV

LEGAL02/36006473v7

LEGAL02/36019505v2

EXHIBIT A

FORM OF ASSIGNMENT AND Acceptance AGREEMENT

This Assignment and Acceptance Agreement (the “Assignment and Assumption”) is dated as of the Effective Date set forth below and is entered into by and between [the][each] Assignor identified in item 1 below ([the][each, an] “Assignor”) and [the][each]¹Assignee identified in item 2 below ([the][each, an] “Assignee”).[It is understood and agreed that the rights and obligations of [the Assignors][the

Assignees]²hereunder are several and not joint.]³ Capitalized terms used but not defined herein shall have the meanings given to them in the Term Loan Agreement identified below (as amended, restated, supplemented, or otherwise modified from time to time, the “Term Loan Agreement”), receipt of a copy of which is hereby acknowledged by [the][each] Assignee. The Standard Terms and Conditions set forth in Annex 1 attached hereto are hereby agreed to and incorporated herein by reference and made a part of this Assignment and Assumption as if set forth herein in full.

For an agreed consideration, [the][each] Assignor hereby irrevocably sells and assigns to [the Assignee][the respective Assignees], and [the][each] Assignee hereby irrevocably purchases and assumes from [the Assignor][the respective Assignors], subject to and in accordance with the Standard Terms and Conditions and the Term Loan Agreement, as of the Effective Date inserted by the Administrative Agent as contemplated below (i) all of [the Assignor’s][the respective Assignors’] rights and obligations in [its capacity as a Lender][their respective capacities as Lenders] under the Term Loan Agreement and any other documents or instruments delivered pursuant thereto to the extent related to the amount and percentage interest identified below of all of such outstanding rights and obligations of [the Assignor][the respective Assignors] under the respective facilities identified below (including without limitation any Guarantees included in such facilities), and (ii) to the extent permitted to be assigned under Applicable Law, all claims, suits, causes of action and any other right of [the Assignor (in its capacity as a Lender)][the respective Assignors (in their respective capacities as Lenders)] against any Person, whether known or unknown, arising under or in connection with the Term Loan Agreement, any other documents or instruments delivered pursuant thereto or the loan transactions governed thereby or in any way based on or related to any of the foregoing, including, but not limited to, contract claims, tort claims, malpractice claims, statutory claims and all other claims at law or in equity related to the rights and obligations sold and assigned pursuant to clause (i) above (the rights and obligations sold and assigned by [the][any] Assignor to [the][any] Assignee pursuant to clauses (i) and (ii) above being referred to herein collectively as [the][an] “Assigned Interest”). Each such sale and assignment is without recourse to [the][any] Assignor and, except as expressly provided in this Assignment and Assumption, without representation or warranty by [the][any] Assignor.

_____________________________________________________________________________________

¹    For bracketed language here and elsewhere in this form relating to the Assignee(s), if the assignment is to a single Assignee, choose the first bracketed language. If the assignment is to multiple Assignees, choose the second bracketed language.

²    Select as appropriate.

³    Include bracketed language if there are either multiple Assignors or multiple Assignees.

LEGAL02/36006473v7

1.Assignor[s]:________________________________

______________________________

[Assignor [is] [is not] a Defaulting Lender]

2. Assignee[s]:______________________________

______________________________

[for each Assignee, indicate [Affiliate][Approved Fund] of [identify Lender]

3. Borrower:Corporate Office Properties, L.P.

4. Administrative Agent:Capital One, National Association, as Administrative Agent under the Term Loan Agreement

5. Term Loan Agreement:Term Loan Agreement dated as of December 17, 2015, by and among Corporate Office Properties, L.P., as Borrower, Corporate Office Properties Trust, as Parent, the financial institutions party thereto and their assignees under Section 12.5. thereof, Capital One, National Association, as Administrative Agent, and the other parties thereto

6. Assigned Interest[s]:

Assignor[s]	Assignee[s]	Facility Assigned4	Aggregate Amount of Commitment/Loans for all Lenders	Amount of Commitment/ Loans Assigned	Percentage Assigned of Commitment/ Loans
			$	$	%
			$	$	%
			$	$	%

[7.Trade Date:______________]⁵ 

[Page break]

___________________________________________________________________________________

⁴    Fill in the appropriate terminology for the types of facilities under the Term Loan Agreement that are being assigned under this Assignment (e.g., “Commitment,” “Term Loan,” etc.)

⁵    To be completed if the Assignor(s) and the Assignee(s) intend that the minimum assignment amount is to be determined as of the Trade Date.

LEGAL02/36006473v7

Effective Date: _____________ ___, 20___ [TO BE INSERTED BY ADMINISTRATIVE AGENT AND WHICH SHALL BE THE EFFECTIVE DATE OF RECORDATION OF TRANSFER IN THE REGISTER THEREFOR.]

The terms set forth in this Assignment and Assumption are hereby agreed to:

ASSIGNOR[S]

[NAME OF ASSIGNOR]

By:______________________________

Title:

[NAME OF ASSIGNOR]

By:______________________________

Title:

ASSIGNEE[S]

[NAME OF ASSIGNEE]

By:______________________________

Title:

[NAME OF ASSIGNEE]

By:______________________________

Title:

LEGAL02/36006473v7

[Consented to and]⁶ Accepted:

CAPITAL ONE, National Association, as Administrative Agent

By: _________________________________

Title:

[Consented to:]⁷

[CORPORATE OFFICE PROPERTIES, L.P.]

By: Corporate Office Properties Trust, its sole general partner

By:

Name:

Title:

[Consented to:]⁸

[NAME OF RELEVANT PARTY]

By: ________________________________

Title:

_______________________________________________________________________________________

⁶    To be added only if the consent of the Agent is required by the terms of the Term Loan Agreement.

⁷    To be added only if the consent of the Borrower is required by the terms of the Term Loan Agreement.

⁸    To be added only if the consent of the other parties is required by the terms of the Term Loan Agreement.

LEGAL02/36006473v7

ANNEX 1

STANDARD TERMS AND CONDITIONS FOR

ASSIGNMENT AND ASSUMPTION

1.Representations and Warranties.

1.1Assignor[s]. [The][Each] Assignor (a) represents and warrants that (i) it is the legal and beneficial owner of [the][the relevant] Assigned Interest, (ii) [the][such] Assigned Interest is free and clear of any lien, encumbrance or other adverse claim, (iii) it has full power and authority, and has taken all action necessary, to execute and deliver this Assignment and Assumption and to consummate the transactions contemplated hereby and (iv) it is [not] a Defaulting Lender; and (b) assumes no responsibility with respect to (i) any statements, warranties or representations made in or in connection with the Term Loan Agreement or any other Loan Document, (ii) the execution, legality, validity, enforceability, genuineness, sufficiency or value of the Loan Documents or any collateral thereunder, (iii) the financial condition of the Borrower, any of its Subsidiaries or Affiliates or any other Person obligated in respect of any Loan Document, or (iv) the performance or observance by the Borrower, any of its Subsidiaries or Affiliates or any other Person of any of their respective obligations under any Loan Document.

1.2. Assignee[s]. [The][Each] Assignee (a) represents and warrants that (i) it has full power and authority, and has taken all action necessary, to execute and deliver this Assignment and Assumption and to consummate the transactions contemplated hereby and to become a Lender under the Term Loan Agreement, (ii) it meets all the requirements to be an Eligible Assignee as defined in the Term Loan Agreement (subject to such consents, if any, as may be required under Section 12.5.(b) of the Term Loan Agreement), (iii) from and after the Effective Date specified for this Assignment and Assumption, it shall be bound by the provisions of the Term Loan Agreement as a Lender thereunder and, to the extent of [the][the relevant] Assigned Interest, shall have the obligations of a Lender thereunder, (iv) it is sophisticated with respect to decisions to acquire assets of the type represented by the Assigned Interest and either it, or the person exercising discretion in making its decision to acquire the Assigned Interest, is experienced in acquiring assets of such type, (v) it has received a copy of the Term Loan Agreement, and has received or has been accorded the opportunity to receive copies of the most recent financial statements delivered pursuant to Section 8.1. or 8.2. thereof, as applicable, and such other documents and information as it deems appropriate to make its own credit analysis and decision to enter into this Assignment and Assumption and to purchase [the][such] Assigned Interest, (vi) it has, independently and without reliance upon the Administrative Agent, the Assignor or any other Lender and based on such documents and information as it has deemed appropriate, made its own credit analysis and decision to enter into this Assignment and Assumption and to purchase [the][such] Assigned Interest; and (b) agrees that (i) it will, independently and without reliance on the Administrative Agent, [the][any] Assignor or any other Lender, and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit decisions in taking or not taking action under the Loan Documents, and (ii) it will perform in accordance with their terms all of the obligations which by the terms of the Loan Documents are required to be performed by it as a Lender, and (vii) if such Assignee is organized under the laws of a jurisdiction outside the United States of America, attached to the Assignment and Assumption is any documentation required to be delivered by it pursuant to the terms of the Term Loan Agreement (including, without limitation, Section 3.12.(c) of the Term Loan Agreement), duly completed and executed by [the][such] Assignee; and (b) agrees that (i) it will, independently and without reliance on the Administrative Agent, [the][any] Assignor or any other Lender, and based on such documents and information as it shall deem appropriate at the time, continue to make its own credit decisions in taking or not taking action under the Loan Documents, and (ii) it will perform in accordance with their

LEGAL02/36006473v7

terms all of the obligations which by the terms of the Loan Documents are required to be performed by it as a Lender.

2. Payments. From and after the Effective Date, the Administrative Agent shall make all payments in respect of [the][each] Assigned Interest (including payments of principal, interest, fees and other amounts) to [the][the relevant] Assignee whether such amounts have accrued prior to, on or after the Effective Date. The Assignor[s] and the Assignee[s] shall make all appropriate adjustments in payments by the Administrative Agent for periods prior to such Effective Date or with respect to the making of this assignment directly between themselves.

3. General Provisions. This Assignment and Assumption shall be binding upon, and inure to the benefit of, the parties hereto and their respective successors and assigns. This Assignment and Assumption may be executed in any number of counterparts, which together shall constitute one instrument. Delivery of an executed counterpart of a signature page of this Assignment and Assumption by telecopy shall be effective as delivery of a manually executed counterpart of this Assignment and Assumption. This Assignment and Assumption shall be governed by, and construed in accordance with, the law of the State of New York.

LEGAL02/36006473v7

EXHIBIT B

FORM OF NOTICE OF BORROWING

____________, 20__

Capital One, National Association,

as Administrative Agent

1680 Capital One Drive, 10th Floor

McLean, Virginia 22102

Attn: Jessica W. Schneickert

Telecopy: (703) 720-2032

Ladies and Gentlemen:

Reference is made to that certain Term Loan Agreement dated as of December 17, 2015 (as amended, restated, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”), and the other parties thereto. Capitalized terms used herein, and not otherwise defined herein, have their respective meanings given them in the Term Loan Agreement.

1. Pursuant to Section 2.1.(b) of the Term Loan Agreement, the Borrower hereby requests that Lenders make a Term Loan to the Borrower in an aggregate amount equal to $___________________.

2. The Borrower requests that such Term Loan be made available to the Borrower on ____________, 20[15/16].

3. The Borrower hereby requests that such Term Loan be of the following Type:

[Check one box only]

Base Rate Loans

LIBOR Loans, with an initial Interest Period for a duration of:

[Check one box only]

seven days

one month

two months

three months

six months

4. The Borrower requests that the proceeds of such Term Loan be made to _______________________ [describe deposit account].

The Borrower hereby certifies to the Administrative Agent and the Lenders that as of the date hereof and as of the date of the making of the requested Term Loans and after giving effect thereto, (a) no Default or Event of Default exists or shall exist, and (b) the representations and warranties made or deemed made

LEGAL02/36006473v7

by the Borrower and each other Loan Party in the Loan Documents to which any of them is a party are and shall be true and correct in all material respects (except in the case of a representation or warranty qualified by materiality, in which case such representation or warranty is true and correct in all respects) with the same force and effect as if made on and as of such date except to the extent that such representations and warranties expressly relate solely to an earlier date (in which case such representations and warranties shall have been true and correct in all material respects (except in the case of a representation or warranty qualified by materiality, in which case such representation or warranty shall have been true and correct in all respects) on and as of such earlier date) and except for changes in factual circumstances not prohibited under the Loan Documents. In addition, the Borrower certifies to the Administrative Agent and the Lenders that all conditions to the making of the requested Term Loans contained in Section 2.1 and Article V. of the Term Loan Agreement, will have been satisfied (or waived in accordance with the applicable provisions of the Loan Documents) at the time such Credit Event are made.

IN WITNESS WHEREOF, the undersigned has duly executed and delivered this Notice of Term Loan Borrowing as of the date first written above.

Corporate Office Properties, L.P.

By: Corporate Office Properties Trust, its general partner

By: ______________

Name:___________

Title:    ________________

LEGAL02/36006473v7

EXHIBIT C

FORM OF NOTICE OF CONTINUATION

____________, 20__

Capital One, National Association,

as Administrative Agent

1680 Capital One Drive, 10th Floor

McLean, Virginia 22102

Attn: Jessica W. Schneickert

Telecopy: (703) 720-2032

Ladies and Gentlemen:

Reference is made to that certain Term Loan Agreement dated as of December 17, 2015 (as amended, restated, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”), and the other parties thereto. Capitalized terms used herein, and not otherwise defined herein, have their respective meanings given them in the Term Loan Agreement.

Pursuant to Section 2.6 of the Term Loan Agreement, the Borrower hereby requests a Continuation of a borrowing of LIBOR Loans under the Term Loan Agreement, and in that connection sets forth below the information relating to such Continuation as required by such Section of the Term Loan Agreement:

1. The proposed date of such Continuation is ____________, 20___.

2. The aggregate principal amount of the Loans indicated above subject to the requested Continuation is $ ____________________ and was originally borrowed by the Borrower on ____________, 20__.

3. The portion of such principal amount subject to such Continuation is $___________________.

4. The current Interest Period for each of the Loans subject to such Continuation ends on ________________, 20__.

5. The duration of the new Interest Period for each of such Loans or portion thereof subject to such Continuation is:

[Check one box only]

seven days

one month

two months

three months

six months

LEGAL02/36006473v7

The Borrower hereby certifies to the Administrative Agent and the Lenders that as of the date hereof, as of the proposed date of the requested Continuation, and after giving effect to such Continuation, (a) no Default or Event of Default exists or will exist, and (b) the representations and warranties made or deemed made by the Borrower and each other Loan Party in the Loan Documents to which any of them is a party are and shall be true and correct in all material respects (except to the extent otherwise qualified by materiality, in which case such representation or warranty are and shall be true and correct in all respects), except to the extent that such representations and warranties expressly relate solely to an earlier date (in which case such representations and warranties shall have been true and correct in all material respects (except to the extent otherwise qualified by materiality, in which case such representation or warranty shall have been true and correct in all respects) on and as of such earlier date) and except for changes in factual circumstances not prohibited under the Loan Documents.

If notice of the requested Continuation was given previously by telephone, this notice is to be considered the written confirmation of such telephone notice required by Section 2.6 of the Term Loan Agreement.

IN WITNESS WHEREOF, the undersigned has duly executed and delivered this Notice of Continuation as of the date first written above.

Corporate Office Properties, L.P.

By: Corporate Office Properties Trust, its general partner

By:     _____________    

Name: _______________

Title: ______________    

LEGAL02/36006473v7

EXHIBIT D

FORM OF NOTICE OF CONVERSION

____________, 20__

Capital One, National Association,

as Administrative Agent

1680 Capital One Drive, 10th Floor

McLean, Virginia 22102

Attn: Jessica W. Schneickert

Telecopy: (703) 720-2032

Ladies and Gentlemen:

Reference is made to that certain Term Loan Agreement dated as of December 17, 2015 (as amended, restated, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”), and the other parties thereto. Capitalized terms used herein, and not otherwise defined herein, have their respective meanings given them in the Term Loan Agreement.

Pursuant to Section 2.7 of the Term Loan Agreement, the Borrower hereby requests a Conversion of a borrowing of Loans of one Type into Loans of another Type under the Term Loan Agreement, and in that connection sets forth below the information relating to such Conversion as required by such Section of the Term Loan Agreement:

1. The proposed date of such Conversion is ______________, 20__.

2. The Type of Loans to be Converted pursuant hereto are currently:

[Check one box only]

Base Rate Loans

LIBOR Loans

3. The aggregate principal amount of the Type of Loans indicated above subject to the requested Conversion is $_____________________ and was originally borrowed by the Borrower on ____________, 20__.

4. The portion of such principal amount subject to such Conversion is $___________________.

5. The amount of such Loans to be so Converted is to be converted into Loans of the following Type:

[Check one box only]

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Base Rate Loans

LIBOR Loans, with an initial Interest Period for a duration of:

[Check one box only]

seven days

one month

two months

three months

six months

[The Borrower hereby certifies to the Administrative Agent and the Lenders that as of the date hereof and as of the date of the requested Conversion and after giving effect thereto, (a) no Default or Event of Default exists or will exist, and (b) the representations and warranties made or deemed made by the Borrower and each other Loan Party in the Loan Documents to which any of them is a party are and shall be true and correct in all material respects (except to the extent otherwise qualified by materiality, in which case such representation or warranty are and shall be true and correct in all respects), except to the extent that such representations and warranties expressly relate solely to an earlier date (in which case such representations and warranties shall have been true and correct in all material respects (except to the extent otherwise qualified by materiality, in which case such representation or warranty shall have been true and correct in all respects) on and as of such earlier date) and except for changes in factual circumstances not prohibited under the Loan Documents.]     Include this certification only when converting a Base Rate Loan into a LIBOR Loan.

If notice of the requested Conversion was given previously by telephone, this notice is to be considered the written confirmation of such telephone notice required by Section 2.7 of the Term Loan Agreement.

IN WITNESS WHEREOF, the undersigned has duly executed and delivered this Notice of Conversion as of the date first written above.

Corporate Office Properties, L.P.

By: Corporate Office Properties Trust, its general partner

By:     _____________

Name:_____________

Title:    _________________

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EXHIBIT E

FORM OF TERM NOTE

$______________December 17, 2015

FOR VALUE RECEIVED, the undersigned, Corporate Office Properties, L.P., a limited partnership formed under the laws of the State of Delaware (the “Borrower”), hereby promises to pay to the order of ____________________ (the “Lender”), in care of Capital One, National Association, as Administrative Agent (the “Administrative Agent”) at 1680 Capital One Drive, 10th Floor, McLean, Virginia 22102, or at such other address as may be specified in writing by the Administrative Agent to the Borrower, the principal sum of ___________________ AND ___/100 DOLLARS ($_____________) (or such lesser amount as shall equal the aggregate unpaid principal amount of the Term Loan made by the Lender to the Borrower under the Term Loan Agreement (defined below)), on the dates and in the principal amounts provided in the Term Loan Agreement, and to pay interest on the unpaid principal amount owing hereunder, at the rates and on the dates provided in the Term Loan Agreement.

This Term Note is one of the Term Notes referred to in the Term Loan Agreement dated as of December 17, 2015 (as amended, restated, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among the Borrower, Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof, the Administrative Agent, and the other parties thereto. Capitalized terms used herein and not defined herein shall have the respective meanings given to such terms in the Term Loan Agreement.

The Term Loan Agreement provides for the acceleration of the maturity of this Term Note upon the occurrence of certain events and for prepayments of Loans upon the terms and conditions specified therein.

Except as permitted by Section 12.5. of the Term Loan Agreement, this Term Note may not be assigned by the Lender to any other Person.

This TERM Note shall be governed by, and construed in accordance with, the laws of the State of NEW YORK APPLICABLE TO CONTRACTS EXECUTED, AND TO BE FULLY PERFORMED, IN SUCH STATE.

The Borrower hereby waives presentment for payment, demand, notice of demand, notice of non‑payment, protest, notice of protest and all other similar notices.

Time is of the essence for this Term Note.

[Signature on following page]

IN WITNESS WHEREOF, the undersigned has executed and delivered this Term Note under seal as of the date written above.

Corporate Office Properties, L.P.

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By: Corporate Office Properties Trust, its general partner

By:     ______________    

Name:_____________

Title:    ______________

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EXHIBIT F

FORM OF OPINION OF COUNSEL

[LETTERHEAD OF COUNSEL TO THE LOAN PARTIES]

December 17, 2015

Capital One, National Association,

as Administrative Agent

1680 Capital One Drive, 10th Floor

McLean, Virginia 22102

The Lenders party to the Term Loan Agreement referred to below

Ladies and Gentlemen:

We have acted as counsel to Corporate Office Properties, L.P., a limited partnership formed under the laws of the State of Delaware (the “Borrower”) in connection with the negotiation, execution and delivery of that certain Term Loan Agreement dated as of December 17, 2015 (the “Term Loan Agreement”), by and among the Borrower, Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”), and the other parties thereto. We have also acted as counsel to each of the Guarantors listed on Schedule 1 attached hereto (the “Guarantors”; together with the Borrower, the “Loan Parties”), in connection with the Guaranty and the other Loan Documents identified below to which they are party. Capitalized terms not otherwise defined herein have the respective meaning given them in the Term Loan Agreement.

In these capacities, we have reviewed executed copies of the following:

(a) the Term Loan Agreement;

(b) the Notes;

(c) the Guaranty; and

(d) [list other applicable Loan Documents].

The documents and instruments set forth in items (a) through (d) above are referred to herein as the “Loan Documents”.

In addition to the foregoing, we have reviewed the [articles or certificate of incorporation, by-laws, declaration of trust, partnership agreement and limited liability company operating agreement, as applicable,] of each Loan Party and certain resolutions of the board of trustees or directors, as applicable, of each Loan Party (collectively, the “Organizational Documents”) and have also examined originals or copies, certified

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or otherwise identified to our satisfaction, of such documents, corporate records, and other instruments, and made such other investigations of law and fact, as we have deemed necessary or advisable for the purposes of rendering this opinion. In our examination of documents, we assumed the genuineness of all signatures on documents presented to us as originals (other than the signatures of officers of the Loan Parties) and the conformity to originals of documents presented to us as conformed or reproduced copies.

Based upon the foregoing, and subject to all of the qualifications and assumptions set forth herein, we are of the opinion that:

1.The Parent is a real estate investment trust, duly organized, validly existing and in good standing under the laws of the State of Maryland, and has the power to execute and deliver, and to perform its obligations under, the Loan Documents to which it is a party, to own and use its assets, and to conduct its business as presently conducted. The Parent is qualified to transact business as a foreign real estate investment trust in the following jurisdictions: ____________________________.

2.The Borrower is a limited partnership, duly organized, validly existing and in good standing under the laws of the State of Delaware, and has the power to execute and deliver, and to perform its obligations under, the Loan Documents to which it is a party, to own and use its assets, and to conduct its business as presently conducted. The Borrower is qualified to transact business as a foreign limited partnership in the following jurisdictions: ____________________________.

3.[Insert separate paragraphs or Guarantors with different corporate structure] Each [Guarantor] is a [corporation, trust, partnership or limited liability company, as applicable,] duly organized or formed, validly existing and in good standing under the laws of the State of its organization or formation and has the power to execute and deliver, and to perform its obligations under, the Loan Documents to which it is a party, to own and use its assets, and to conduct its business as presently conducted. Each [Guarantor] is qualified to transact business as a foreign [corporation, trust, partnership or limited liability company, as applicable,] in the indicated jurisdictions set forth on Schedule I attached hereto.

4.Each Loan Party has duly authorized the execution and delivery of the Loan Documents to which it is a party and the performance by such Loan Party of all of its obligations under each such Loan Document.

5.Each Loan Party has duly executed and delivered the Loan Documents to which it is a party.

6.The execution and delivery by each Loan Party of the Loan Documents to which it is a party do not, and if each Loan Party were now to perform its obligations under such Loan Documents, such performance would not, result in any:

(a)violation of such Loan Party’s Organizational Documents;

(b)violation of any existing federal or state constitution, statute, regulation, rule, order, or law to which such Loan Party or its assets are subject;

(c)breach or violation of or default under, any agreement, instrument, indenture or other document evidencing any indebtedness for money borrowed or any other material agreement to which, to our knowledge, such Loan Party is bound or under which a Loan Party or its assets is subject;

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(d)creation or imposition of a lien or security interest in, on or against the assets of such Loan Party under any agreement, instrument, indenture or other document evidencing any indebtedness for money borrowed or any other material agreement to which, to our knowledge, such Loan Party is bound or under which a Loan Party or its assets is subject; or

(e)violation of any judicial or administrative decree, writ, judgment or order to which, to our knowledge, such Loan Party or its assets are subject.

7.The execution, delivery and performance by each Loan Party of each Loan Document to which it is a party, and the consummation of the transactions thereunder, do not and will not require any registration with, consent or approval of, or notice to, or other action to, with or by, any Governmental Authority of the United States of America or the States of ___________, ___________ or ___________.

8.To our knowledge, there are no judgments outstanding against any of the Loan Parties or affecting any of their respective assets, nor is there any litigation or other proceeding against any of the Loan Parties or its assets pending or overtly threatened, could reasonably be expected to have a materially adverse effect on (a) the business, assets, liabilities, condition (financial or otherwise), results of operations or business prospects of the Borrower or any other Loan Party or (b) the validity or enforceability of any of the Loan Documents.

9.None of the Loan Parties is, or, after giving effect to any Loan will be, subject to the Investment Company Act of 1940 or to any federal or state statute or regulation limiting its ability to incur indebtedness for borrowed money.

10.No transfer, mortgage, intangible, documentary stamp or similar taxes are payable by the Administrative Agent or the Lenders to the States of _________ or _________ or any political subdivision thereof in connection with (a) the execution and delivery of the Loan Documents or (b) the creation of the Indebtedness and the other Obligations evidenced by any of the Loan Documents.

11.Assuming that Borrower applies the proceeds of the Loans as provided in the Term Loan Agreement, the transactions contemplated by the Loan Documents do not violate the provisions of Regulations T, U or X of the Board of Governors of the Federal Reserve System of the United States of America.

12.The consideration to be paid to the Administrative Agent and the Lenders for the financial accommodations to be provided to the Loan Parties pursuant to the Term Loan Agreement does not violate any law of the States of ____________ or ____________ relating to interest and usury.

This opinion is limited to the laws of the States of _____________, _____________ and ____________, and the federal laws of the United States of America, and we express no opinions with respect to the law of any other jurisdiction.

[Other Customary Qualifications/Assumptions/Limitations]

This opinion is furnished to you solely for your benefit in connection with the consummation of the transactions contemplated by the Term Loan Agreement and may not be relied upon by any other Person, other than an Assignee of a Lender, or for any other purpose without our express, prior written consent.

Very truly yours,

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[NAME OF LAW FIRM]

By:__________________

A Partner

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SCHEDULE 1

Guarantors

Name Jurisdiction of Formation Jurisdictions of Foreign Qualification

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EXHIBIT G

FORM OF COMPLIANCE CERTIFICATE

_______________, 20__

Capital One, National Association,

as Administrative Agent

1680 Capital One Drive, 10th Floor

McLean, Virginia 22102

Attn: Jessica W. Schneickert

Telecopy: (703) 720-2032

Each of the Lenders Party to the Term Loan Agreement referred to below

Ladies and Gentlemen:

Reference is made to that certain Term Loan Agreement dated as of December 17, 2015 (as amended, restated, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust (the “Parent”), the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”) and the other parties thereto. Capitalized terms used herein, and not otherwise defined herein, have their respective meanings given them in the Term Loan Agreement.

Pursuant to Section 8.3. of the Term Loan Agreement, the undersigned hereby certifies to the Administrative Agent and the Lenders as follows:

(1)The undersigned is the _____________________ of the Parent.

(2)The undersigned has examined the books and records of the Borrower and has conducted such other examinations and investigations as are reasonably necessary to provide this Compliance Certificate.

(3)No Default or Event of Default exists [if such is not the case, specify such Default or Event of Default and its nature, when it occurred and whether it is continuing and the steps being taken by the Borrower with respect to such event, condition or failure].

(4)The representations and warranties made or deemed made by the Borrower and the other Loan Parties in the Loan Documents to which any is a party, are true and correct in all material respects (except to the extent otherwise qualified by materiality, in which case such representation or warranty are true and correct in all respects) on and as of the date hereof except to the extent that such representations and warranties expressly relate solely to an earlier date (in which case such representations and warranties were true and accurate in all material respects (except to the extent otherwise qualified by materiality, in which case such representation or warranty were true and correct in all respects) on and as of such earlier date) and except for changes in factual circumstances not prohibited under the Loan Documents.

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(5)Attached hereto as Schedule 1 are reasonably detailed calculations establishing whether or not the Borrower and its Subsidiaries were in compliance with the covenants contained in Section 9.1. of the Term Loan Agreement.

IN WITNESS WHEREOF, the undersigned has executed this certificate as of the date first above written.

Name:    _____________

Title:    _______________

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Schedule 1

[Calculations to be Attached]

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EXHIBIT H

FORM OF GUARANTY

THIS GUARANTY dated as of December 17, 2015, executed and delivered by each of the undersigned and the other Persons from time to time party hereto pursuant to the execution and delivery of an Accession Agreement in the form of Annex I hereto (all of the undersigned, together with such other Persons each a “Guarantor” and collectively, the “Guarantors”) in favor of (a) Capital One, National Association its capacity as Administrative Agent (the “Administrative Agent”) for the Lenders under that certain Term Loan Agreement dated as of December 17, 2015 (as amended, restated, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), the Administrative Agent, and the other parties thereto, and (b) the Lenders.

WHEREAS, pursuant to the Term Loan Agreement, the Administrative Agent and the Lenders have agreed to make available to the Borrower certain financial accommodations on the terms and conditions set forth in the Term Loan Agreement;

WHEREAS, the Borrower and each of the Guarantors, though separate legal entities, are mutually dependent on each other in the conduct of their respective businesses as an integrated operation and have determined it to be in their mutual best interests to obtain financing from the Administrative Agent and the Lenders through their collective efforts;

WHEREAS, each Guarantor acknowledges that it will receive direct and indirect benefits from the Administrative Agent and the Lenders making such financial accommodations available to the Borrower under the Term Loan Agreement and, accordingly, each Guarantor is willing to guarantee the Borrower’s obligations to the Administrative Agent and the Lenders on the terms and conditions contained herein; and

WHEREAS, each Guarantor’s execution and delivery of this Guaranty is a condition to the Administrative Agent and the Lenders making, and continuing to make, such financial accommodations to the Borrower.

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged by each Guarantor, each Guarantor agrees as follows:

Section 1. Guaranty. Each Guarantor hereby absolutely, irrevocably and unconditionally guaranties the due and punctual payment and performance when due, whether at stated maturity, by acceleration or otherwise, of all of the following (collectively referred to as the “Guarantied Obligations”): (a) all indebtedness and obligations owing by the Borrower to any Lender or the Administrative Agent under or in connection with the Term Loan Agreement and any other Loan Document, including without limitation, the repayment of all principal of the Loans, and the payment of all interest, Fees, charges, attorneys’ fees and other amounts payable to any Lender or the Administrative Agent thereunder or in connection therewith; (b) any and all extensions, renewals, modifications, amendments or substitutions of the foregoing; (c) all expenses, including, without limitation, reasonable attorneys’ fees and disbursements, that are incurred by

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the Lenders and the Administrative Agent in the enforcement of any of the foregoing or any obligation of such Guarantor hereunder; and (d) all other Obligations.

Section 2. Guaranty of Payment and Not of Collection. This Guaranty is a guaranty of payment, and not of collection, and a debt of each Guarantor for its own account. Accordingly, none of the Lenders nor the Administrative Agent shall be obligated or required before enforcing this Guaranty against any Guarantor: (a)  to pursue any right or remedy any of them may have against the Borrower, any other Guarantor or any other Person or commence any suit or other proceeding against the Borrower, any other Guarantor or any other Person in any court or other tribunal; (b) to make any claim in a liquidation or bankruptcy of the Borrower, any other Guarantor or any other Person; or (c) to make demand of the Borrower, any other Guarantor or any other Person or to enforce or seek to enforce or realize upon any collateral security held by the Lenders or the Administrative Agent which may secure any of the Guarantied Obligations.

Section 3. Guaranty Absolute. Each Guarantor guarantees that the Guarantied Obligations will be paid strictly in accordance with the terms of the documents evidencing the same, regardless of any Applicable Law now or hereafter in effect in any jurisdiction affecting any of such terms or the rights of the Administrative Agent or the Lenders with respect thereto. The liability of each Guarantor under this Guaranty shall be absolute, irrevocable and unconditional in accordance with its terms and shall remain in full force and effect without regard to, and shall not be released, suspended, discharged, terminated or otherwise affected by, any circumstance or occurrence whatsoever, including without limitation, the following (whether or not such Guarantor consents thereto or has notice thereof):

(a)(i) any change in the amount, interest rate or due date or other term of any of the Guarantied Obligations, (ii) any change in the time, place or manner of payment of all or any portion of the Guarantied Obligations, (iii) any amendment or waiver of, or consent to the departure from or other indulgence with respect to, the Term Loan Agreement, any other Loan Document, or any other document or instrument evidencing or relating to any Guarantied Obligations, or (iv) any waiver, renewal, extension, addition, or supplement to, or deletion from, or any other action or inaction under or in respect of, the Term Loan Agreement, any of the other Loan Documents, or any other documents, instruments or agreements relating to the Guarantied Obligations or any other instrument or agreement referred to therein or evidencing any Guarantied Obligations or any assignment or transfer of any of the foregoing;

(b)any lack of validity or enforceability of the Term Loan Agreement, any of the other Loan Documents, or any other document, instrument or agreement referred to therein or evidencing any Guarantied Obligations or any assignment or transfer of any of the foregoing;

(c)any furnishing to the Administrative Agent or the Lenders of any security for the Guarantied Obligations, or any sale, exchange, release or surrender of, or realization on, any collateral securing any of the Obligations;

(d)any settlement or compromise of any of the Guarantied Obligations, any security therefor, or any liability of any other party with respect to the Guarantied Obligations, or any subordination of the payment of the Guarantied Obligations to the payment of any other liability of the Borrower or any other Loan Party;

(e)any bankruptcy, insolvency, reorganization, composition, adjustment, dissolution, liquidation or other like proceeding relating to such Guarantor, the Borrower, any other Loan Party or any other Person, or any action taken with respect to this Guaranty by any trustee or receiver, or by any court, in any such proceeding;

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(f)any act or failure to act by the Borrower, any other Loan Party or any other Person which may adversely affect such Guarantor’s subrogation rights, if any, against the Borrower to recover payments made under this Guaranty;

(g)any nonperfection or impairment of any security interest or other Lien on any collateral, if any, securing in any way any of the Obligations;

(h)any application of sums paid by the Borrower, any other Guarantor or any other Person with respect to the liabilities of the Borrower to the Administrative Agent or the Lenders, regardless of what liabilities of the Borrower remain unpaid;

(i)any defect, limitation or insufficiency in the borrowing powers of the Borrower or in the exercise thereof; or

(j)any other circumstance which might otherwise constitute a defense available to, or a discharge of, a Guarantor hereunder (other than indefeasible payment and performance in full).

Section 4. Action with Respect to Guarantied Obligations. The Lenders and the Administrative Agent may, at any time and from time to time, without the consent of, or notice to, any Guarantor, and without discharging any Guarantor from its obligations hereunder, take any and all actions described in Section 3 and may otherwise: (a) amend, modify, alter or supplement the terms of any of the Guarantied Obligations, including, but not limited to, extending or shortening the time of payment of any of the Guarantied Obligations or changing the interest rate that may accrue on any of the Guarantied Obligations; (b) amend, modify, alter or supplement the Term Loan Agreement or any other Loan Document; (c) sell, exchange, release or otherwise deal with all, or any part, of any collateral securing any of the Obligations; (d) release any other Loan Party or other Person liable in any manner for the payment or collection of the Guarantied Obligations; (e) exercise, or refrain from exercising, any rights against the Borrower, any other Guarantor or any other Person; and (f) apply any sum, by whomsoever paid or however realized, to the Guarantied Obligations in such order as the Lenders shall elect.

Section 5. Representations and Warranties. Each Guarantor hereby makes to the Administrative Agent and the Lenders all of the representations and warranties made by the Borrower with respect to or in any way relating to such Guarantor in the Term Loan Agreement and the other Loan Documents, as if the same were set forth herein in full.

Section 6. Covenants. Each Guarantor will comply with all covenants which the Borrower is to cause such Guarantor to comply with under the terms of the Term Loan Agreement or any of the other Loan Documents.

Section 7. Waiver. Each Guarantor, to the fullest extent permitted by Applicable Law, hereby waives notice of acceptance hereof or any presentment, demand, protest or notice of any kind, and any other act or thing, or omission or delay to do any other act or thing, which in any manner or to any extent might vary the risk of such Guarantor or which otherwise might operate to discharge such Guarantor from its obligations hereunder.

Section 8. Inability to Accelerate Loan. If the Administrative Agent and/or the Lenders are prevented under Applicable Law or otherwise from demanding or accelerating payment of any of the Guarantied Obligations by reason of any automatic stay or otherwise, the Administrative Agent and/or the Lenders shall be entitled to receive from each Guarantor, upon demand therefor, the sums which otherwise would have been due had such demand or acceleration occurred.

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Section 9. Reinstatement of Guarantied Obligations. If claim is ever made on the Administrative Agent or any Lender for repayment or recovery of any amount or amounts received in payment or on account of any of the Guarantied Obligations, and the Administrative Agent or such Lender repays all or part of said amount by reason of (a) any judgment, decree or order of any court or administrative body of competent jurisdiction, or (b) any settlement or compromise of any such claim effected by the Administrative Agent or such Lender with any such claimant (including the Borrower or a trustee in bankruptcy for the Borrower), then and in such event each Guarantor agrees that any such judgment, decree, order, settlement or compromise shall be binding on it, notwithstanding any revocation hereof or the cancellation of the Term Loan Agreement, any of the other Loan Documents, or any other instrument evidencing any liability of the Borrower, and such Guarantor shall be and remain liable to the Administrative Agent or such Lender for the amounts so repaid or recovered to the same extent as if such amount had never originally been paid to the Administrative Agent or such Lender.

Section 10. Subrogation. Upon the making by any Guarantor of any payment hereunder for the account of the Borrower, such Guarantor shall be subrogated to the rights of the payee against the Borrower; provided, however, that such Guarantor shall not enforce any right or receive any payment by way of subrogation or otherwise take any action in respect of any other claim or cause of action such Guarantor may have against the Borrower arising by reason of any payment or performance by such Guarantor pursuant to this Guaranty, unless and until all of the Guarantied Obligations have been indefeasibly paid and performed in full. If any amount shall be paid to such Guarantor on account of or in respect of such subrogation rights or other claims or causes of action, such Guarantor shall hold such amount in trust for the benefit of the Administrative Agent and the Lenders and shall forthwith pay such amount to the Administrative Agent to be credited and applied against the Guarantied Obligations, whether matured or unmatured, in accordance with the terms of the Term Loan Agreement or to be held by the Administrative Agent as collateral security for any Guarantied Obligations existing.

Section 11. Payments Free and Clear. All sums payable by each Guarantor hereunder, whether of principal, interest, Fees, expenses, premiums or otherwise, shall be paid in full, without set‑off or counterclaim or any deduction or withholding whatsoever (including any Taxes), and if any Guarantor is required by Applicable Law or by a Governmental Authority to make any such deduction or withholding, such Guarantor shall pay to the Administrative Agent and the Lenders such additional amount as will result in the receipt by the Administrative Agent and the Lenders of the full amount payable hereunder had such deduction or withholding not occurred or been required.

Section 12. Set-off. In addition to any rights now or hereafter granted under any of the other Loan Documents or Applicable Law and not by way of limitation of any such rights, each Guarantor hereby authorizes the Administrative Agent and each Lender, at any time during the continuance of an Event of Default, without any prior notice to such Guarantor or to any other Person, any such notice being hereby expressly waived, but in the case of a Lender or Participant subject to receipt of the prior written consent of the Administrative Agent exercised in its sole discretion, to set off and to appropriate and to apply any and all deposits (general or special, including, but not limited to, indebtedness evidenced by certificates of deposit, whether matured or unmatured) and any other indebtedness at any time held or owing by the Administrative Agent, such Lender, or any Affiliate of the Administrative Agent or such Lender, to or for the credit or the account of such Guarantor against and on account of any of the Guarantied Obligations, although such obligations shall be contingent or unmatured. Each Guarantor agrees, to the fullest extent permitted by Applicable Law, that any Participant may exercise rights of setoff or counterclaim and other rights with respect to its participation as fully as if such Participant were a direct creditor of such Guarantor in the amount of such participation.

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Section 13. Subordination. Each Guarantor hereby expressly covenants and agrees for the benefit of the Administrative Agent and the Lenders that all obligations and liabilities of the Borrower to such Guarantor of whatever description, including without limitation, all intercompany receivables of such Guarantor from the Borrower (collectively, the “Junior Claims”) shall be subordinate and junior in right of payment to all Guarantied Obligations. If an Event of Default shall exist, then no Guarantor shall accept any direct or indirect payment (in cash, property or securities, by setoff or otherwise) from the Borrower on account of or in any manner in respect of any Junior Claim until all of the Guarantied Obligations have been indefeasibly paid in full.

Section 14. Avoidance Provisions. It is the intent of each Guarantor, the Administrative Agent and the Lenders that in any Proceeding, such Guarantor’s maximum obligation hereunder shall equal, but not exceed, the maximum amount which would not otherwise cause the obligations of such Guarantor hereunder (or any other obligations of such Guarantor to the Administrative Agent and the Lenders) to be avoidable or unenforceable against such Guarantor in such Proceeding as a result of Applicable Law, including without limitation, (a) Section 548 of the Bankruptcy Code of 1978, as amended (the “Bankruptcy Code”) and (b) any state fraudulent transfer or fraudulent conveyance act or statute applied in such Proceeding, whether by virtue of Section 544 of the Bankruptcy Code or otherwise. The Applicable Laws under which the possible avoidance or unenforceability of the obligations of such Guarantor hereunder (or any other obligations of such Guarantor to the Administrative Agent and the Lenders) shall be determined in any such Proceeding are referred to as the “Avoidance Provisions”. Accordingly, to the extent that the obligations of any Guarantor hereunder would otherwise be subject to avoidance under the Avoidance Provisions, the maximum Guarantied Obligations for which such Guarantor shall be liable hereunder shall be reduced to that amount which, as of the time any of the Guarantied Obligations are deemed to have been incurred under the Avoidance Provisions, would not cause the obligations of such Guarantor hereunder (or any other obligations of such Guarantor to the Administrative Agent and the Lenders), to be subject to avoidance under the Avoidance Provisions. This Section is intended solely to preserve the rights of the Administrative Agent and the Lenders hereunder to the maximum extent that would not cause the obligations of any Guarantor hereunder to be subject to avoidance under the Avoidance Provisions, and no Guarantor or any other Person shall have any right or claim under this Section as against the Administrative Agent and the Lenders that would not otherwise be available to such Person under the Avoidance Provisions.

Section 15. Information. Each Guarantor assumes all responsibility for being and keeping itself informed of the financial condition of the Borrower and the other Guarantors, and of all other circumstances bearing upon the risk of nonpayment of any of the Guarantied Obligations and the nature, scope and extent of the risks that such Guarantor assumes and incurs hereunder, and agrees that none of the Administrative Agent or the Lenders shall have any duty whatsoever to advise any Guarantor of information regarding such circumstances or risks.

Section 16. Governing Law. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS EXECUTED, AND TO BE FULLY PERFORMED, IN SUCH STATE.

Section 17. Waiver of jury trial.

(a)EACH PARTY HERETO ACKNOWLEDGES THAT ANY DISPUTE OR CONTROVERSY BETWEEN OR AMONG ANY GUARANTOR, THE ADMINISTRATIVE AGENT OR ANY OF THE LENDERS WOULD BE BASED ON DIFFICULT AND COMPLEX ISSUES OF LAW AND FACT AND WOULD RESULT IN DELAY AND EXPENSE TO THE PARTIES. ACCORDINGLY,

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TO THE EXTENT PERMITTED BY APPLICABLE LAW, EACH OF THE LENDERS, THE ADMINISTRATIVE AGENT AND EACH GUARANTOR HEREBY WAIVES ITS RIGHT TO A TRIAL BY JURY IN ANY ACTION OR PROCEEDING OF ANY KIND OR NATURE IN ANY COURT OR TRIBUNAL IN WHICH AN ACTION MAY BE COMMENCED BY OR AGAINST ANY PARTY HERETO ARISING OUT OF THIS GUARANTY OR ANY OTHER LOAN DOCUMENT OR BY REASON OF ANY OTHER SUIT, CAUSE OF ACTION OR DISPUTE WHATSOEVER BETWEEN OR AMONG ANY GUARANTOR, THE ADMINISTRATIVE AGENT OR ANY OF THE LENDERS OF ANY KIND OR NATURE RELATING TO ANY OF THE LOAN DOCUMENTS.

(b)EACH OF THE GUARANTORS, THE ADMINISTRATIVE AGENT AND EACH LENDER HEREBY AGREES THAT THE FEDERAL DISTRICT COURT LOCATED IN THE SOUTHERN DISTRICT OF NEW YORK OR, ANY STATE COURT LOCATED IN THE BOROUGH OF MANHATTAN, NEW YORK, NEW YORK, SHALL HAVE JURISDICTION TO HEAR AND DETERMINE ANY CLAIMS OR DISPUTES BETWEEN OR AMONG ANY GUARANTOR, THE ADMINISTRATIVE AGENT OR ANY OF THE LENDERS, PERTAINING DIRECTLY OR INDIRECTLY TO THIS GUARANTY OR ANY OTHER LOAN DOCUMENT OR TO ANY MATTER ARISING HEREFROM OR THEREFROM. EACH GUARANTOR AND EACH OF THE LENDERS EXPRESSLY SUBMITS AND CONSENTS IN ADVANCE TO SUCH JURISDICTION IN ANY ACTION OR PROCEEDING COMMENCED IN SUCH COURTS WITH RESPECT TO SUCH CLAIMS OR DISPUTES. EACH PARTY FURTHER WAIVES ANY OBJECTION THAT IT MAY NOW OR HEREAFTER HAVE TO THE VENUE OF ANY SUCH ACTION OR PROCEEDING IN ANY SUCH COURT OR THAT SUCH ACTION OR PROCEEDING WAS BROUGHT IN AN INCONVENIENT FORUM AND EACH AGREES NOT TO PLEAD OR CLAIM THE SAME. THE CHOICE OF FORUM SET FORTH IN THIS SECTION SHALL NOT BE DEEMED TO PRECLUDE THE BRINGING OF ANY ACTION BY THE ADMINISTRATIVE AGENT OR ANY LENDER OR THE ENFORCEMENT BY THE ADMINISTRATIVE AGENT OR ANY LENDER OF ANY JUDGMENT OBTAINED IN SUCH FORUM IN ANY OTHER APPROPRIATE JURISDICTION.

(c)THE PROVISIONS OF THIS SECTION HAVE BEEN CONSIDERED BY EACH PARTY WITH THE ADVICE OF COUNSEL AND WITH A FULL UNDERSTANDING OF THE LEGAL CONSEQUENCES THEREOF, AND SHALL SURVIVE THE PAYMENT OF THE LOANS AND ALL OTHER AMOUNTS PAYABLE HEREUNDER OR UNDER THE OTHER LOAN DOCUMENTS AND THE TERMINATION OF THIS GUARANTY.

Section 18. Loan Accounts. The Administrative Agent and each Lender may maintain books and accounts setting forth the amounts of principal, interest and other sums paid and payable with respect to the Guarantied Obligations, and in the case of any dispute relating to any of the outstanding amount, payment or receipt of any of the Guarantied Obligations or otherwise, the entries in such books and accounts shall be deemed conclusive evidence of the amounts and other matters set forth herein, absent manifest error. The failure of the Administrative Agent or any Lender to maintain such books and accounts shall not in any way relieve or discharge any Guarantor of any of its obligations hereunder.

Section 19. Waiver of Remedies. No delay or failure on the part of the Administrative Agent or any Lender in the exercise of any right or remedy it may have against any Guarantor hereunder or otherwise shall operate as a waiver thereof, and no single or partial exercise by the Administrative Agent or any Lender of any such right or remedy shall preclude any other or further exercise thereof or the exercise of any other such right or remedy.

LEGAL02/36006473v7

Section 20. Termination. This Guaranty shall remain in full force and effect until indefeasible payment in full of the Guarantied Obligations and the other Obligations and the termination or cancellation of the Term Loan Agreement in accordance with its terms.

Section 21. Successors and Assigns. Each reference herein to the Administrative Agent or the Lenders shall be deemed to include such Person’s respective successors and assigns (including, but not limited to, any holder of the Guarantied Obligations) in whose favor the provisions of this Guaranty also shall inure, and each reference herein to each Guarantor shall be deemed to include such Guarantor’s successors and assigns, upon whom this Guaranty also shall be binding. The Lenders may, in accordance with the applicable provisions of the Term Loan Agreement, assign, transfer or sell any Guarantied Obligation, or grant or sell participations in any Guarantied Obligations, to any Person without the consent of, or notice to, any Guarantor and without releasing, discharging or modifying any Guarantor’s obligations hereunder. Subject to Section 12.8. of the Term Loan Agreement, each Guarantor hereby consents to the delivery by the Administrative Agent or any Lender to any Eligible Assignee or Participant (or any prospective Eligible Assignee or Participant) of any financial or other information regarding the Borrower or any Guarantor. No Guarantor may assign or transfer its obligations hereunder to any Person without the prior written consent of all Lenders and any such assignment or other transfer to which all of the Lenders have not so consented shall be null and void.

Section 22. Joint and Several Obligations. the obligationS of the Guarantors HEREUNDER SHALL BE joint and several, and ACCORDINGLY, each Guarantor CONFIRMS THAT IT is liable for the full amount of the “GUARANTiED Obligations” AND ALL OF THE OBLIGATIONS AND LIABILITIES OF EACH OF THE OTHER gUARANTORS HEREUNDER.

Section 23. Amendments. This Guaranty may not be amended except in writing signed by the Requisite Lenders (or all of the Lenders if required under the terms of the Term Loan Agreement), the Administrative Agent and each Guarantor.

Section 24. Payments. All payments to be made by any Guarantor pursuant to this Guaranty shall be made in Dollars, in immediately available funds to the Administrative Agent at the Principal Office, not later than 2:00 p.m. on the date of demand therefor.

Section 25. Notices. All notices, requests and other communications hereunder shall be in writing (including facsimile transmission or similar writing) and shall be given (a) to each Guarantor at its address set forth below its signature hereto, (b) to the Administrative Agent or any Lender at its respective address for notices provided for in the Term Loan Agreement, or (c) as to each such party at such other address as such party shall designate in a written notice to the other parties. Each such notice, request or other communication shall be effective (i) if mailed, when received or when receipt is refused; (ii) if telecopied, when transmitted; or (iii) if hand delivered, when delivered; provided, however, that any notice of a change of address for notices shall not be effective until received.

Section 26. Severability. In case any provision of this Guaranty shall be invalid, illegal or unenforceable in any jurisdiction, the validity, legality and enforceability of the remaining provisions shall not in any way be affected or impaired thereby.

Section 27. Headings. Section headings used in this Guaranty are for convenience only and shall not affect the construction of this Guaranty.

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Section 28. Limitation of Liability. Neither the Administrative Agent nor any Lender, nor any Affiliate, officer, director, employee, attorney, or agent of the Administrative Agent or any Lender, shall have any liability with respect to, and each Guarantor hereby waives, releases, and agrees not to sue any of them upon, any claim for any special, indirect, incidental, or consequential damages suffered or incurred by a Guarantor in connection with, arising out of, or in any way related to, this Guaranty or any of the other Loan Documents, or any of the transactions contemplated by this Guaranty, the Term Loan Agreement or any of the other Loan Documents. Each Guarantor hereby waives, releases, and agrees not to sue the Administrative Agent or any Lender or any of the Administrative Agent’s or any Lender’s Affiliates, officers, directors, employees, attorneys, or agents for punitive damages in respect of any claim in connection with, arising out of, or in any way related to, this Guaranty, the Term Loan Agreement or any of the other Loan Documents, or any of the transactions contemplated by Term Loan Agreement or financed thereby.

Section 29. Definitions. (a) For the purposes of this Guaranty:

“Proceeding” means any of the following: (i) a voluntary or involuntary case concerning any Guarantor shall be commenced under the Bankruptcy Code of 1978, as amended; (ii) a custodian (as defined in such Bankruptcy Code or any other applicable bankruptcy laws) is appointed for, or takes charge of, all or any substantial part of the property of any Guarantor; (iii) any other proceeding under any Applicable Law, domestic or foreign, relating to bankruptcy, insolvency, reorganization, winding‑up or composition for adjustment of debts, whether now or hereafter in effect, is commenced relating to any Guarantor; (iv) any Guarantor is adjudicated insolvent or bankrupt; (v) any order of relief or other order approving any such case or proceeding is entered by a court of competent jurisdiction; (vi) any Guarantor makes a general assignment for the benefit of creditors; (vii) any Guarantor shall fail to pay, or shall state that it is unable to pay, or shall be unable to pay, its debts generally as they become due; (viii) any Guarantor shall call a meeting of its creditors with a view to arranging a composition or adjustment of its debts; (ix) any Guarantor shall by any act or failure to act indicate its consent to, approval of or acquiescence in any of the foregoing; or (x) any corporate action shall be taken by any Guarantor for the purpose of effecting any of the foregoing.

(b)Terms not otherwise defined herein are used herein with the respective meanings given them in the Term Loan Agreement.

[Signature on Next Page]

IN WITNESS WHEREOF, each Guarantor has duly executed and delivered this Guaranty as of the date and year first written above.

CORPORATE OFFICE PROPERTIES TRUST

By: _________________

Name:____________

Title:________________

[OTHER GUARANTORS]

Address for Notices for all Guarantors:

c/o Corporate Office Properties, L.P.

6711 Columbia Gateway Drive, Suite 300

LEGAL02/36006473v7

Columbia, Maryland 21046

Attention: General Counsel

Telephone Number:(443) 285-5400

Telecopy Number:(443) 285-7650

LEGAL02/36006473v7

ANNEX I

FORM OF ACCESSION AGREEMENT

THIS ACCESSION AGREEMENT dated as of ____________, 20___, executed and delivered by ______________________, a _____________ (the “New Guarantor”), in favor of (a) Capital One, National Association, in its capacity as Administrative Agent (the “Administrative Agent”) for the Lenders under that certain Term Loan Agreement dated as of December 17, 2015 (as amended, restated, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), the Administrative Agent, and the other parties thereto, and (b) the Lenders.

WHEREAS, pursuant to the Term Loan Agreement, the Administrative Agent and the Lenders have agreed to make available to the Borrower certain financial accommodations on the terms and conditions set forth in the Term Loan Agreement;

WHEREAS, the Borrower, the New Guarantor, and the existing Guarantors, though separate legal entities, are mutually dependent on each other in the conduct of their respective businesses as an integrated operation and have determined it to be in their mutual best interests to obtain financing from the Administrative Agent and the Lenders through their collective efforts;

WHEREAS, the New Guarantor acknowledges that it will receive direct and indirect benefits from the Administrative Agent and the Lenders making such financial accommodations available to the Borrower under the Term Loan Agreement and, accordingly, the New Guarantor is willing to guarantee the Borrower’s obligations to the Administrative Agent and the Lenders on the terms and conditions contained herein; and

WHEREAS, the New Guarantor’s execution and delivery of this Agreement is a condition to the Administrative Agent and the Lenders continuing to make such financial accommodations to the Borrower.

NOW, THEREFORE, for good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged by the New Guarantor, the New Guarantor agrees as follows:

Section 1. Accession to Guaranty. The New Guarantor hereby agrees that it is a “Guarantor” under that certain Guaranty dated as of December 17, 2015 (as amended, supplemented, restated or otherwise modified from time to time, the “Guaranty”), made by each Subsidiary of the Borrower a party thereto in favor of the Administrative Agent and the Lenders and assumes all obligations of a “Guarantor” thereunder, all as if the New Guarantor had been an original signatory to the Guaranty. Without limiting the generality of the foregoing, the New Guarantor hereby:

(a)irrevocably and unconditionally guarantees the due and punctual payment and performance when due, whether at stated maturity, by acceleration or otherwise, of all Guarantied Obligations (as defined in the Guaranty);

(b)makes to the Administrative Agent and the Lenders as of the date hereof each of the representations and warranties contained in Section 5 of the Guaranty and agrees to be bound by each of the covenants contained in Section 6 of the Guaranty; and

(c)consents and agrees to each provision set forth in the Guaranty.

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SECTION 2. GOVERNING LAW. THIS AGREEMENT SHALL BE GOVERNED BY, AND CONSTRUED AND ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK APPLICABLE TO CONTRACTS EXECUTED, AND TO BE FULLY PERFORMED, IN SUCH STATE.

Section 3. Definitions. Capitalized terms used herein and not otherwise defined herein shall have their respective defined meanings given them in the Term Loan Agreement.

[Signatures on Next Page]

IN WITNESS WHEREOF, the New Guarantor has caused this Accession Agreement to be duly executed and delivered under seal by its duly authorized officers as of the date first written above.

[NEW GUARANTOR]

By:_______________

Name:_______________

Title:_______________

Address for Notices:

c/o Corporate Office Properties, L.P.

6711 Columbia Gateway Drive, Suite 300

Columbia, Maryland 21046

Attention: General Counsel

Telephone Number:(443) 285-5400

Telecopy Number:(443) 285-7650

Accepted:

Capital One, National Association, as Administrative Agent

By:    ______________

Name:________

Title:________

LEGAL02/36006473v7

EXHIBIT I

FORM OF GUARANTOR RELEASE

________ ___, 20__

Corporate Office Properties, L.P.

6711 Columbia Gateway Drive, Suite 300

Columbia, Maryland 21046

Attention: General Counsel

Ladies and Gentlemen:

Reference is made to that certain Term Loan Agreement dated as of December 17, 2015 (as amended, restated, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”), and the other parties thereto. Capitalized terms used herein, and not otherwise defined herein, have their respective meanings given them in the Term Loan Agreement.

The Borrower has requested that each of the Subsidiaries identified on Exhibit A attached hereto (each a “Subsidiary Guarantor”) be released as a Guarantor from the Guaranty in accordance with Section 7.12.(c) of the Term Loan Agreement. In reliance on the representations deemed made by the Borrower pursuant to the last sentence of Section 7.12.(c), the Administrative Agent confirms that each Subsidiary Guarantor is released as a Guarantor from the Guaranty effective as of the date of this letter.

[Signatures on Following Page]

IN WITNESS WHEREOF, the undersigned has duly executed and delivered this Guarantor Release as of the date first written above.

CAPITAL ONE, NATIONAL ASSOCIATION, as Administrative Agent

By: _________

Name:_________

                        Title: ___________________

LEGAL02/36006473v7

EXHIBIT J-1

FORM OF U.S. TAX COMPLIANCE CERTIFICATE

(For Foreign Lenders That Are Not Partnerships For U.S. Federal Income Tax Purposes)

Reference is hereby made to the Term Loan Agreement dated as of December 17, 2015 (as amended, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”), and the other parties thereto. Capitalized terms used herein, and not otherwise defined herein, have their respective meanings given them in the Term Loan Agreement.

Pursuant to the provisions of Section 3.12. of the Term Loan Agreement, the undersigned hereby certifies that (i) it is the sole record and beneficial owner of the Loan(s) (as well as any Note(s) evidencing such Loan(s)) in respect of which it is providing this certificate, (ii) it is not a bank within the meaning of Section 881(c)(3)(A) of the Internal Revenue Code, (iii) it is not a ten percent shareholder of the Borrower within the meaning of Section 871(h)(3)(B) of the Internal Revenue Code and (iv) it is not a controlled foreign corporation related to the Borrower as described in Section 881(c)(3)(C) of the Internal Revenue Code.

The undersigned has furnished the Administrative Agent and the Borrower with a certificate of its non-U.S. Person status on IRS Form W-8BEN or Form W-8BEN-E, as applicable,. By executing this certificate, the undersigned agrees that (1) if the information provided on this certificate changes, the undersigned shall promptly so inform the Borrower and the Administrative Agent, and (2) the undersigned shall have at all times furnished the Borrower and the Administrative Agent with a properly completed and currently effective certificate in either the calendar year in which each payment is to be made to the undersigned, or in either of the two calendar years preceding such payments.

Unless otherwise defined herein, terms defined in the Term Loan Agreement and used herein shall have the meanings given to them in the Term Loan Agreement.

[NAME OF LENDER]

By:__________

Name:_____________

Title:___________

Date: ________ __, 20__

LEGAL02/36006473v7

EXHIBIT J-2

FORM OF U.S. TAX COMPLIANCE CERTIFICATE

(For Foreign Participants That Are Not Partnerships For U.S. Federal Income Tax Purposes)

Reference is hereby made to the Term Loan Agreement dated as of December 17, 2015 (as amended, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”), and the other parties thereto. Capitalized terms used herein, and not otherwise defined herein, have their respective meanings given them in the Term Loan Agreement.

Pursuant to the provisions of Section 3.12. of the Term Loan Agreement, the undersigned hereby certifies that (i) it is the sole record and beneficial owner of the participation in respect of which it is providing this certificate, (ii) it is not a bank within the meaning of Section 881(c)(3)(A) of the Internal Revenue Code, (iii) it is not a ten percent shareholder of the Borrower within the meaning of Section 871(h)(3)(B) of the Internal Revenue Code, and (iv) it is not a controlled foreign corporation related to the Borrower as described in Section 881(c)(3)(C) of the Internal Revenue Code.

The undersigned has furnished its participating Lender with a certificate of its non-U.S. Person status on IRS Form W-8BEN or Form W-8BEN-E, as applicable,. By executing this certificate, the undersigned agrees that (1) if the information provided on this certificate changes, the undersigned shall promptly so inform such Lender in writing, and (2) the undersigned shall have at all times furnished such Lender with a properly completed and currently effective certificate in either the calendar year in which each payment is to be made to the undersigned, or in either of the two calendar years preceding such payments.

Unless otherwise defined herein, terms defined in the Term Loan Agreement and used herein shall have the meanings given to them in the Term Loan Agreement.

[NAME OF PARTICIPANT]

By:__________

Name:___________

Title:___________

Date: ________ __, 20__

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EXHIBIT J-3

FORM OF U.S. TAX COMPLIANCE CERTIFICATE

(For Foreign Participants That Are Partnerships For U.S. Federal Income Tax Purposes)

Reference is hereby made to the Term Loan Agreement dated as of December 17, 2015 (as amended, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”), and the other parties thereto. Capitalized terms used herein, and not otherwise defined herein, have their respective meanings given them in the Term Loan Agreement.

Pursuant to the provisions of Section 3.12. of the Term Loan Agreement, the undersigned hereby certifies that (i) it is the sole record owner of the participation in respect of which it is providing this certificate, (ii) its direct or indirect partners/members are the sole beneficial owners of such participation, (iii) with respect such participation, neither the undersigned nor any of its direct or indirect partners/members is a bank extending credit pursuant to a loan agreement entered into in the ordinary course of its trade or business within the meaning of Section 881(c)(3)(A) of the Internal Revenue Code, (iv) none of its direct or indirect partners/members is a ten percent shareholder of the Borrower within the meaning of Section 871(h)(3)(B) of the Internal Revenue Code and (v) none of its direct or indirect partners/members is a controlled foreign corporation related to the Borrower as described in Section 881(c)(3)(C) of the Internal Revenue Code.

The undersigned has furnished its participating Lender with IRS Form W-8IMY accompanied by one of the following forms from each of its partners/members that is claiming the portfolio interest exemption: (i) an IRS Form W-8BEN or Form W-8BEN-E, as applicable, or (ii) an IRS Form W-8IMY accompanied by an IRS Form W-8BEN or Form W-8BEN-E, as applicable, from each of such partner’s/member’s beneficial owners that is claiming the portfolio interest exemption. By executing this certificate, the undersigned agrees that (1) if the information provided on this certificate changes, the undersigned shall promptly so inform such Lender and (2) the undersigned shall have at all times furnished such Lender with a properly completed and currently effective certificate in either the calendar year in which each payment is to be made to the undersigned, or in either of the two calendar years preceding such payments.

Unless otherwise defined herein, terms defined in the Term Loan Agreement and used herein shall have the meanings given to them in the Term Loan Agreement.

[NAME OF PARTICIPANT]

By:______________

Name:______________

Title:______________

Date: ________ __, 20__

LEGAL02/36006473v7

EXHIBIT J-4

FORM OF U.S. TAX COMPLIANCE CERTIFICATE

(For Foreign Lenders That Are Partnerships For U.S. Federal Income Tax Purposes)

Reference is hereby made to the Term Loan Agreement dated as of December 17, 2015 (as amended, supplemented or otherwise modified from time to time, the “Term Loan Agreement”), by and among Corporate Office Properties, L.P. (the “Borrower”), Corporate Office Properties Trust, the financial institutions party thereto and their assignees under Section 12.5. thereof (the “Lenders”), Capital One, National Association, as Administrative Agent (the “Administrative Agent”), and the other parties thereto. Capitalized terms used herein, and not otherwise defined herein, have their respective meanings given them in the Term Loan Agreement.

Pursuant to the provisions of Section 3.12. of the Term Loan Agreement, the undersigned hereby certifies that (i) it is the sole record owner of the Loan(s) (as well as any Note(s) evidencing such Loan(s)) in respect of which it is providing this certificate, (ii) its direct or indirect partners/members are the sole beneficial owners of such Loan(s) (as well as any Note(s) evidencing such Loan(s)), (iii) with respect to the extension of credit pursuant to this Term Loan Agreement or any other Loan Document, neither the undersigned nor any of its direct or indirect partners/members is a bank extending credit pursuant to a loan agreement entered into in the ordinary course of its trade or business within the meaning of Section 881(c)(3)(A) of the Internal Revenue Code, (iv) none of its direct or indirect partners/members is a ten percent shareholder of the Borrower within the meaning of Section 871(h)(3)(B) of the Internal Revenue Code and (v) none of its direct or indirect partners/members is a controlled foreign corporation related to the Borrower as described in Section 881(c)(3)(C) of the Internal Revenue Code.

The undersigned has furnished the Administrative Agent and the Borrower with IRS Form W-8IMY accompanied by one of the following forms from each of its partners/members that is claiming the portfolio interest exemption: (i) an IRS Form W-8BEN or Form W-8BEN-E, as applicable, or (ii) an IRS Form W-8IMY accompanied by an IRS Form W-8BEN or Form W-8BEN-E, as applicable, from each of such partner’s/member’s beneficial owners that is claiming the portfolio interest exemption. By executing this certificate, the undersigned agrees that (1) if the information provided on this certificate changes, the undersigned shall promptly so inform the Borrower and the Administrative Agent, and (2) the undersigned shall have at all times furnished the Borrower and the Administrative Agent with a properly completed and currently effective certificate in either the calendar year in which each payment is to be made to the undersigned, or in either of the two calendar years preceding such payments.

Unless otherwise defined herein, terms defined in the Term Loan Agreement and used herein shall have the meanings given to them in the Term Loan Agreement.

[NAME OF LENDER]

By:    _________

Name:________

Title:________

Date: ________ __, 20__

LEGAL02/36006473v7

EX-12.1

EXHIBIT 12.1

Corporate Office Properties Trust

Ratio of Earnings to Combined Fixed Charges and Preferred Share Dividends

(Dollars in thousands)

	Years Ended December 31,
	2015			2014			2013			2012			2011
Earnings:
Income (loss) from continuing operations before equity in income (loss) of unconsolidated entities and income taxes	$	120,812		$	34,590		$	36,704		$	8,894		$	(85,580	)
Gain on sales of real estate, excluding discontinued operations	68,047			10,671			9,016			21			2,732
Combined fixed charges and preferred share dividends (from below)	111,737			115,842			120,307			133,345			139,159
Amortization of capitalized interest	2,591			2,374			1,977			1,798			1,610
Distributed income (loss) of equity investees	361			225			1,857			—			(31		)
Subtract:
Capitalized interest (from below)	(7,151		)	(6,065		)	(8,785		)	(13,903		)	(17,400		)
Preferred share dividends included in fixed charges	(14,210		)	(15,939		)	(19,971		)	(20,844		)	(16,102		)
Preferred unit distributions included in fixed charges	(660		)	(660		)	(660		)	(660		)	(660		)
Preferred distributions of other consolidated entities	(16		)	(16		)	(16		)	(16		)	—
Total earnings	$	281,511		$	141,022		$	140,429		$	108,635		$	23,728
Combined Fixed Charges and Preferred Share Dividends:
Combined fixed charges and preferred share dividends:
Interest expense on continuing operations	$	89,074		$	92,393		$	82,010		$	86,401		$	90,037
Interest expense on discontinued operations	—			—			8,221			10,397			14,264
Capitalized interest (internal and external)	7,151			6,065			8,785			13,903			17,400
Amortization of debt issuance costs-capitalized	8			186			144			649			183
Interest included in rental expense	618			583			500			475			513
Preferred share dividends	14,210			15,939			19,971			20,844			16,102
Preferred unit distributions	660			660			660			660			660
Preferred distributions of other consolidated entities	16			16			16			16			—
Total combined fixed charges and preferred share dividends	$	111,737		$	115,842		$	120,307		$	133,345		$	139,159
Ratio of earnings to combined fixed charges and preferred share dividends	2.52			1.22			1.17			0.81			0.17
										$	24,710		$	115,431

For purposes of calculating the above ratios, earnings were computed by adding fixed charges (excluding capitalized interest), gain on sales of real estate (excluding discontinued operations) amortization of capitalized interest and distributed income (loss) of equity investees to income (loss) from continuing operations before noncontrolling interests, equity in income (loss) of unconsolidated entities and income taxes. Fixed charges consist of interest costs and capitalized amortization of debt issuance costs.

EX-12.2

EXHIBIT 12.2

Corporate Office Properties, L.P.

Ratio of Earnings to Fixed Charges

(Dollars in thousands)

	Years Ended December 31,
Earnings:	2015			2014			2013			2012			2011
Income (loss) from continuing operations before equity in income (loss) of unconsolidated entities and income taxes	$	120,812		$	34,590		$	36,704		$	8,894		$	(85,574	)
Gain on sales of real estate, excluding discontinued operations	68,047			10,671			9,016			21			2,732
Fixed charges (from below)	96,867			99,243			99,676			111,825			122,397
Amortization of capitalized interest	2,591			2,374			1,977			1,798			1,610
Distributed income (loss) of equity investees	361			225			1,857			—			(31		)
Subtract:
Capitalized interest (from below)	(7,151		)	(6,065		)	(8,785		)	(13,903		)	(17,400		)
Preferred distributions of other consolidated entities	(16		)	(16		)	(16		)	—			—
Total earnings	$	281,511		$	141,022		$	140,429		$	108,635		$	23,734
Fixed charges:
Interest expense on continuing operations	$	89,074		$	92,393		$	82,010		$	86,401		$	90,037
Interest expense on discontinued operations	—			—			8,221			10,397			14,264
Capitalized interest (internal and external)	7,151			6,065			8,785			13,903			17,400
Amortization of debt issuance costs-capitalized	8			186			144			649			183
Interest included in rental expense	618			583			500			475			513
Preferred distributions of other consolidated entities	16			16			16			—			—
Total fixed charges	$	96,867		$	99,243		$	99,676		$	111,825		$	122,397
Ratio of earnings to fixed charges	2.91			1.42			1.41			0.97			0.19
										$	3,190		$	98,663

For purposes of calculating the above ratios, earnings were computed by adding fixed charges (excluding capitalized interest), gain on sales of real estate (excluding discontinued operations) amortization of capitalized interest and distributed income (loss) of equity investees to income (loss) from continuing operations before noncontrolling interests, equity in income (loss) of unconsolidated entities and income taxes. Fixed charges consist of interest costs and capitalized amortization of debt issuance costs.

EX-21.1

	Exhibit 21.1
CORPORATE OFFICE PROPERTIES TRUST
SUBSIDIARIES OF REGISTRANT
Alabama
COPT Bridge Street Office, LLC
Colorado
Colorado Land Acquisition, LLC
COPT Academy Ridge, LLC
COPT Aerotech, LLC
COPT Cresterra 3535, LLC
COPT Cresterra Master LLC
COPT Interquest, LLC
COPT Interquest III, LLC
COPT Interquest IV, LLC
COPT Interquest Epic I, LLC
COPT Interquest Hybrid I, LLC
COPT Interquest Hybrid II, LLC
COPT Newport C, LLC
COPT Newport D, LLC
COPT Northcreek, LLC
COPT Patriot Park at Galley, LLC
COPT Patriot Park I, LLC
COPT Patriot Park II, LLC
COPT Patriot Park V, LLC
COPT Patriot Park VI, LLC
COPT Patriot Park VII, LLC
Patriot Park, LLC
Delaware
Airport Square Holdings I, LLC
Airport Square Holdings VI and VII, LLC
Blue Bell Investment Company, LP
COPT Acquisitions, Inc.
COPT Colgate General, LLC
COPT Concourse, LLC
COPT DC-6, LLC
COPT Gateway Commerce, LLC
COPT Maritime I & II, LLC
COPT Stevens Place, LLC
Corporate Office Properties, LP
Corporate Office Properties Holdings, Inc.
Delaware Airport III, LLC
Delaware Airport VIII, LLC
Delaware Airport IX, LLC
Great Mills I, L.L.C.
Great Mills II, L.L.C.
Great Mills III, L.L.C.
Great Mills IV, L.L.C.
Great Mills V, L.L.C.
LW Redstone Company, LLC
Powerloft Holdings, LLC

Redstone Gateway 1000, LLC

Redstone Gateway 1100, LLC

Redstone Gateway 1200, LLC

Redstone Gateway 2100, LLC

Redstone Gateway 6500, LLC

Redstone Gateway 7200, LLC

Stevens Investors, LLC

Maryland

100 Charm City, LLC

100 LS Borrower, LLC

110 Thomas Johnson, LLC

131 Parkway, LLC

133 Parkway, LLC

134, LLC

135 Parkway, LLC

1362 Mellon, LLC

141 Parkway, LLC

1460 Dorsey Road, LLC

1550 Nursery LLC

250 Charm City, LLC

2500 Riva Trust

2691 Technology, LLC

2701 Technology, LLC

2711 Technology, LLC

2720 Technology, LLC

2730 Hercules, LLC

30 Charm City, LLC

30 LS Borrower, LLC

302 Sentinel, LLC

304 Sentinel, LLC

306 Sentinel, LLC

318 Sentinel, LLC

320 Sentinel, LLC

322 Sentinel, LLC

45310 Abell House, LLC

5825 URC Borrower, LLC

5850 URC Borrower, LLC

67 Financing, LLC

6700 Alexander Bell, LLC

6711 Gateway Funding, LLC

6711 Gateway, LLC

6721 CGD., LLC

6721 Gateway, LLC

6731 Gateway, LLC

6741 Gateway, LLC

6940 CGD, LLC

6950 CG, LLC

7000 CG, LLC

7000 Honeys, LLC

7005 Columbia Gateway, LLC

7015 Albert Einstein Drive, LLC

7130 Columbia Gateway, LLC

7150-70 Riverwood. LLC

7200 Riverwood, LLC

7205 Riverwood, LLC

7240 Parkway Drive Enterprises, LLC

7318 Parkway Drive Enterprises, LLC

7320 Parkway Drive Enterprises, LLC

7320 PD, LLC

7740 Milestone LLC

7760 Milestone Parkway, LLC

7780 Milestone Parkway, LLC

7874 Milestone Parkway, LLC

7876 Milestone Parkway, LLC

7878 Milestone Parkway, LLC

7880 Milestone Parkway, LLC

8027 Corporate Drive Business Trust

8621 RFD, LLC

8661 RFD, LLC

9690 Deereco Road, LLC

Airport Square II, LLC

Airport Square IV, LLC

Airport Square Partners, LLC

Airport Square Storms, LLC

Airport Square V, LLC

Airport Square XI, LLC

Airport Square XIII, LLC

Airport Square XXII, LLC

Airport Square, LLC

AP#5 Lot A, LLC

AP#5 Lot B, LLC

AP#5 Lot C, LLC

Arundel Preserve #5, LLC

ASI, LLC

Atrium Building, LLC

Campbell Boulevard I Business Trust

Campbell Boulevard II Business Trust

Campbell Boulevard Trust

Campbell Corporate Center 1-2 Business Trust

Canton Crossing Retail, LLC

Clarks Hundred II, LLC

Clarks Hundred, LLC

Columbia Equity Finance, LLC

Columbia Gateway S-28, LLC

COMI Investments LLC

Commons Office 6-B, LLC

Commons Office Research, LLC

Concourse 1304, LLC

COPT Aberdeen, LLC

COPT Arundel Preserve, LLC

COPT AP 9, LLC

COPT Babcock Business Trust

COPT Baltimore County I, LLC

COPT Baltimore County II, LLC

COPT Brock Bridge, LLC

COPT CC 1600, LLC

COPT CC Bulkhead LLC

COPT CC D1 LLC

COPT CC Holding LLC

COPT CC Parking LLC

COPT CC Tower LLC

COPT CCW I LLC

COPT CCW II LLC

COPT CCW III LLC

COPT Chantilly I Manager, LLC

COPT Chantilly II Manager, LLC

COPT Data Management, LLC

COPT Development & Construction Services, LLC

COPT Frederick, LLC

COPT Gate 63, LLC

COPT Gate 6700-6708-6724, LLC

COPT General, LLC

COPT Harbour's Edge LLC

COPT Harrisburg GP, LLC

COPT Harrisburg L.P.

COPT Huntsville, LLC

COPT Northgate A, LLC

COPT Northgate B, LLC

COPT Northgate C, LLC

COPT Northgate D, LLC

COPT Northgate H, LLC

COPT Northgate I, LLC

COPT Powerhouse LLC

COPT Pres Investment, LLC

COPT Property Management Services, LLC

COPT Renovation, LLC

COPT Riverwood, LLC

COPT T-11, LLC

COPT Virtru, LLC

COPT-Kirk AP#5, LLC

Cornucopia Holdings II, LLC

Cornucopia Holdings, LLC

Corporate Center I Limited Partnership

Corporate Center I, LLC

Corporate Development Services, LLC

Corporate Gatespring II, LLC

Corporate Gatespring, LLC

Corporate Office Management, Inc.

Corporate Office Services, LLC

Corporate Paragon, LLC

Corporate Place B Equity Affiliates, LLC

Corporate Place I Business Trust

Corporate Place III Business Trust

Corporate Place IV Business Trust

Corporate Property, LLC

Enterprise Campus Developer, LLC

Fifth Exploration, L.L.C.

Fourth Exploration, L.L.C.

Franklin Ridge No. 1 Business Trust

Franklin Ridge No. 2 Business Trust

Franklin Ridge No. 3 Business Trust

Franklin Ridge No. 4 Business Trust

Franklin Ridge Open Space Business Trust

Franklin Ridge V Business Trust

Gateway 44, LLC

Gateway 67, LLC

Gateway 70 Holdings, LLC

Gateway 70, LLC

Gateway Crossing 95, LLC

Honeyland 108, LLC

Huntsville Holdings, LLC

Jolly COPT I, LLC

Jolly COPT II, LLC

Lot 401 Business Trust

M Square 5825, LLC

M Square 5850, LLC

M Square Associates, LLC

M Square NOAA, LLC

Maritime Holdings, LLC

McLean Ridge I Business Trust

McLean Ridge II Business Trust

McLean Ridge III Business Trust

McLean Ridge IV Business Trust

MOR Forbes, LLC

NBP 131, LLC

NBP 132, LLC

NBP 133 LLC

NBP 134, LLC

NBP 135, LLC

NBP 140, LLC

NBP 141, LLC

NBP 191, LLC

NBP 201 Holdings, LLC

NBP 201, LLC

NBP 211 Holdings, LLC

NBP 211, LLC

NBP 220 Holdings, LLC

NBP 220, LLC

NBP 221, LLC

NBP 300 Restaurant, LLC

NBP 300, LLC

NBP 302, LLC

NBP 304, LLC

NBP 306, LLC

NBP 308, LLC

NBP 310, LLC

NBP 312 LLC

NBP 314, LLC

NBP 316, LLC

NBP 318, LLC

NBP 320, LLC

NBP 322, LLC

NBP 324, LLC

NBP 410, LLC

NBP 420, LLC

NBP 430, LLC

NBP 520, LLC

NBP 540, LLC

NBP Huff & Puff, LLC

NBP Lot 3-A, LLC

NBP One, LLC

NBP Retail, LLC

Nottingham Commons I Holding Corp.

Nottingham Commons II Holding Corp.

Nottingham Ridge Holding Corporation

Nottingham Ridge I Business Trust

Nottingham Ridge II Business Trust

Nottingham Ridge III Business Trust

Nottingham Ridge No. 20 Business Trust

Nottingham Ridge No. 30 Business Trust

One Sellner Road LLC

Park Circle Equities, LLC

Pecan Court, L.L.C.

Philadelphia Road Business Trust

Red Cedar Building, LLC

RG 2100 Restaurant, LLC

RIVA Trustee, LLC

Riverwood Business Center Equity Affiliates, LLC

Third Exploration, L.L.C.

Tyler Ridge I Business Trust

Tyler Ridge I, LLC

Tyler Ridge II A Business Trust

Tyler Ridge II Business Trust

Tyler Ridge Limited Partnership

Tyler Ridge Water Management Business Trust

W&M Business Trust

White Marsh Business Center 2 Business Trust

White Marsh Business Center Limited Partnership

White Marsh Business Center, LLC

White Marsh Hi-Tech 1 Business Trust

White Marsh Hi-Tech 2 Business Trust

WMBC 13A Investment Company, LLC

Pennsylvania

Colgatedrive Associates, L.P.

COPT Pennlyn, L.P.

Texas

COPT 8000 Potranco, L.P.

COPT 8030 Potranco, L.P.

COPT 8100 Potranco, L.P.

COPT San Antonio General, LLC

COPT San Antonio, LP

COPT San Antonio II, L.P.

COPT SA Technology Center, L.P.

COPT Sentry Gateway 100 LP

COPT Westpointe 3A, L.P.

COPT Westpointe 4, L.P.

Virginia

COPT Chantilly, LLC

COPT Chantilly II, LLC

COPT Connect LLC

COPT Dahlgren, LLC

COPT Dahlgren I, LLC

COPT Dahlgren II, LLC

COPT Dahlgren IV, LLC

COPT Dahlgren Land, LLC

COPT DC-8, LLC

COPT DC-11, LLC

COPT DC-12, LLC

COPT DC-15, LLC

COPT DC-18, LLC

COPT Fairview, LLC

COPT Greens I, LLC

COPT Greens II, LLC

COPT Greens III, LLC

COPT McLearen, LLC

COPT Metro Place II, LLC

COPT Park Meadow, LLC

COPT Parkstone, LLC

COPT Richmond I, LLC

COPT Ridgeview I, LLC

COPT Ridgeview II & III, LLC

COPT Southwest VA, LLC

COPT Stonecroft, LLC

COPT Sunrise, LLC

COPT Waterview I, LLC

COPT Waterview III, LLC

COPT Westbranch, LLC

Patriot Ridge I, LLC

Patriot Ridge II, LLC

Patriot Ridge 7770, LLC

Patriot Ridge Commons, LLC

Patriot Ridge Holdings, LLC

TRC Pinnacle Towers, L.L.C.

EX-21.2

	Exhibit 21.2
CORPORATE OFFICE PROPERTIES, L.P.
SUBSIDIARIES OF REGISTRANT
Alabama
COPT Bridge Street Office, LLC
Colorado
Colorado Land Acquisition, LLC
COPT Academy Ridge, LLC
COPT Aerotech, LLC
COPT Cresterra 3535, LLC
COPT Cresterra Master LLC
COPT Interquest, LLC
COPT Interquest III, LLC
COPT Interquest IV, LLC
COPT Interquest Epic I, LLC
COPT Interquest Hybrid I, LLC
COPT Interquest Hybrid II, LLC
COPT Newport C, LLC
COPT Newport D, LLC
COPT Northcreek, LLC
COPT Patriot Park at Galley, LLC
COPT Patriot Park I, LLC
COPT Patriot Park II, LLC
COPT Patriot Park V, LLC
COPT Patriot Park VI, LLC
COPT Patriot Park VII, LLC
Patriot Park, LLC
Delaware
Airport Square Holdings I, LLC
Airport Square Holdings VI and VII, LLC
Blue Bell Investment Company, LP
COPT Colgate General, LLC
COPT Concourse, LLC
COPT DC-6, LLC
COPT Gateway Commerce, LLC
COPT Maritime I & II, LLC
COPT Stevens Place, LLC
Delaware Airport III, LLC
Delaware Airport VIII, LLC
Delaware Airport IX, LLC
Great Mills I, L.L.C.
Great Mills II, L.L.C.
Great Mills III, L.L.C.

Great Mills IV, L.L.C.

Great Mills V, L.L.C.

LW Redstone Company, LLC

Powerloft Holdings, LLC

Redstone Gateway 1000, LLC

Redstone Gateway 1100, LLC

Redstone Gateway 1200, LLC

Redstone Gateway 2100, LLC

Redstone Gateway 6500, LLC

Redstone Gateway 7200, LLC

Stevens Investors, LLC

Maryland

100 Charm City, LLC

100 LS Borrower, LLC

110 Thomas Johnson, LLC

131 Parkway, LLC

133 Parkway, LLC

134, LLC

135 Parkway, LLC

1362 Mellon, LLC

141 Parkway, LLC

1460 Dorsey Road, LLC

1550 Nursery LLC

250 Charm City, LLC

2500 Riva Trust

2691 Technology, LLC

2701 Technology, LLC

2711 Technology, LLC

2720 Technology, LLC

2730 Hercules, LLC

30 Charm City, LLC

30 LS Borrower, LLC

302 Sentinel, LLC

304 Sentinel, LLC

306 Sentinel, LLC

318 Sentinel, LLC

320 Sentinel, LLC

322 Sentinel, LLC

45310 Abell House, LLC

5825 URC Borrower, LLC

5850 URC Borrower, LLC

67 Financing, LLC

6700 Alexander Bell, LLC

6711 Gateway Funding, LLC

6711 Gateway, LLC

6721 CGD., LLC

6721 Gateway, LLC

6731 Gateway, LLC

6741 Gateway, LLC

6940 CGD, LLC

6950 CG, LLC

7000 CG, LLC

7000 Honeys, LLC

7005 Columbia Gateway, LLC

7015 Albert Einstein Drive, LLC

7130 Columbia Gateway, LLC

7150-70 Riverwood. LLC

7200 Riverwood, LLC

7205 Riverwood, LLC

7240 Parkway Drive Enterprises, LLC

7318 Parkway Drive Enterprises, LLC

7320 Parkway Drive Enterprises, LLC

7320 PD, LLC

7740 Milestone LLC

7760 Milestone LLC

7780 Milestone LLC

7874 Milestone LLC

7876 Milestone LLC

7878 Milestone Parkway, LLC

7880 Milestone Parkway, LLC

8027 Corporate Drive Business Trust

8621 RFD, LLC

8661 RFD, LLC

9690 Deereco Road, LLC

Airport Square II, LLC

Airport Square IV, LLC

Airport Square Partners, LLC

Airport Square Storms, LLC

Airport Square V, LLC

Airport Square XI, LLC

Airport Square XIII, LLC

Airport Square XXII, LLC

Airport Square, LLC

AP#5 Lot A, LLC

AP#5 Lot B, LLC

AP#5 Lot C, LLC

Arundel Preserve #5, LLC

ASI, LLC

Atrium Building, LLC

Campbell Boulevard I Business Trust

Campbell Boulevard II Business Trust

Campbell Boulevard Trust

Campbell Corporate Center 1-2 Business Trust

Canton Crossing Retail, LLC

Clarks Hundred II, LLC

Clarks Hundred, LLC

Columbia Equity Finance, LLC

Columbia Gateway S-28, LLC

COMI Investments LLC

Commons Office 6-B, LLC

Commons Office Research, LLC

Concourse 1304, LLC

COPT Aberdeen, LLC

COPT Arundel Preserve, LLC

COPT AP 9, LLC

COPT Babcock Business Trust

COPT Baltimore County I, LLC

COPT Baltimore County II, LLC

COPT Brock Bridge, LLC

COPT CC 1600, LLC

COPT CC Bulkhead LLC

COPT CC D1 LLC

COPT CC Holding LLC

COPT CC Parking LLC

COPT CC Tower LLC

COPT CCW I LLC

COPT CCW II LLC

COPT CCW III LLC

COPT Chantilly I Manager, LLC

COPT Chantilly II Manager, LLC

COPT Data Management, LLC

COPT Development & Construction Services, LLC

COPT Frederick, LLC

COPT Gate 63, LLC

COPT Gate 6700-6708-6724, LLC

COPT General, LLC

COPT Harbour's Edge LLC

COPT Harrisburg GP, LLC

COPT Harrisburg L.P.

COPT Huntsville, LLC

COPT Northgate A, LLC

COPT Northgate B, LLC

COPT Northgate C, LLC

COPT Northgate D, LLC

COPT Northgate H, LLC

COPT Northgate I, LLC

COPT Powerhouse LLC

COPT Pres Investment, LLC

COPT Property Management Services, LLC

COPT Renovation, LLC

COPT Riverwood, LLC

COPT T-11, LLC

COPT Virtru, LLC

COPT-Kirk AP#5, LLC

Cornucopia Holdings II, LLC

Cornucopia Holdings, LLC

Corporate Center I Limited Partnership

Corporate Center I, LLC

Corporate Development Services, LLC

Corporate Gatespring II, LLC

Corporate Gatespring, LLC

Corporate Office Management, Inc.

Corporate Office Services, LLC

Corporate Paragon, LLC

Corporate Place B Equity Affiliates, LLC

Corporate Place I Business Trust

Corporate Place III Business Trust

Corporate Place IV Business Trust

Corporate Property, LLC

Enterprise Campus Developer, LLC

Fifth Exploration, L.L.C.

Fourth Exploration, L.L.C.

Franklin Ridge No. 1 Business Trust

Franklin Ridge No. 2 Business Trust

Franklin Ridge No. 3 Business Trust

Franklin Ridge No. 4 Business Trust

Franklin Ridge Open Space Business Trust

Franklin Ridge V Business Trust

Gateway 44, LLC

Gateway 67, LLC

Gateway 70 Holdings, LLC

Gateway 70, LLC

Gateway Crossing 95, LLC

Honeyland 108, LLC

Huntsville Holdings, LLC

Jolly COPT I, LLC

Jolly COPT II, LLC

Lot 401 Business Trust

M Square 5825, LLC

M Square 5850, LLC

M Square Associates, LLC

M Square NOAA, LLC

Maritime Holdings, LLC

McLean Ridge I Business Trust

McLean Ridge II Business Trust

McLean Ridge III Business Trust

McLean Ridge IV Business Trust

MOR Forbes, LLC

NBP 131, LLC

NBP 132, LLC

NBP 133 LLC

NBP 134, LLC

NBP 135, LLC

NBP 140, LLC

NBP 141, LLC

NBP 191, LLC

NBP 201 Holdings, LLC

NBP 201, LLC

NBP 211 Holdings, LLC

NBP 211, LLC

NBP 220 Holdings, LLC

NBP 220, LLC

NBP 221, LLC

NBP 300 Restaurant, LLC

NBP 300, LLC

NBP 302, LLC

NBP 304, LLC

NBP 306, LLC

NBP 308, LLC

NBP 310, LLC

NBP 312 LLC

NBP 314, LLC

NBP 316, LLC

NBP 318, LLC

NBP 320, LLC

NBP 322, LLC

NBP 324, LLC

NBP 410, LLC

NBP 420, LLC

NBP 430, LLC

NBP 520, LLC

NBP 540, LLC

NBP Huff & Puff, LLC

NBP Lot 3-A, LLC

NBP One, LLC

NBP Retail, LLC

Nottingham Commons I Holding Corp.

Nottingham Commons II Holding Corp.

Nottingham Ridge Holding Corporation

Nottingham Ridge I Business Trust

Nottingham Ridge II Business Trust

Nottingham Ridge III Business Trust

Nottingham Ridge No. 20 Business Trust

Nottingham Ridge No. 30 Business Trust

One Sellner Road LLC

Park Circle Equities, LLC

Pecan Court, L.L.C.

Philadelphia Road Business Trust

Red Cedar Building, LLC

RG 2100 Restaurant, LLC

RIVA Trustee, LLC

Riverwood Business Center Equity Affiliates, LLC

Third Exploration, L.L.C.

Tyler Ridge I Business Trust

Tyler Ridge I, LLC

Tyler Ridge II A Business Trust

Tyler Ridge II Business Trust

Tyler Ridge Limited Partnership

Tyler Ridge Water Management Business Trust

W&M Business Trust

White Marsh Business Center 2 Business Trust

White Marsh Business Center Limited Partnership

White Marsh Business Center, LLC

White Marsh Hi-Tech 1 Business Trust

White Marsh Hi-Tech 2 Business Trust

WMBC 13A Investment Company, LLC

Pennsylvania

Colgatedrive Associates, L.P.

COPT Pennlyn, L.P.

Texas

COPT 8000 Potranco, L.P.

COPT 8030 Potranco, L.P.

COPT 8100 Potranco, L.P.

COPT San Antonio General, LLC

COPT San Antonio, LP

COPT San Antonio II, L.P.

COPT SA Technology Center, L.P.

COPT Sentry Gateway 100 LP

COPT Westpointe 3A, L.P.

COPT Westpointe 4, L.P.

Virginia

COPT Chantilly, LLC

COPT Chantilly II, LLC

COPT Connect LLC

COPT Dahlgren, LLC

COPT Dahlgren I, LLC

COPT Dahlgren II, LLC

COPT Dahlgren IV, LLC

COPT Dahlgren Land, LLC

COPT DC-8, LLC

COPT DC-11, LLC

COPT DC-12, LLC

COPT DC-15, LLC

COPT DC-18, LLC

COPT Fairview, LLC

COPT Greens I, LLC

COPT Greens II, LLC

COPT Greens III, LLC

COPT McLearen, LLC

COPT Metro Place II, LLC

COPT Park Meadow, LLC

COPT Parkstone, LLC

COPT Richmond I, LLC

COPT Ridgeview I, LLC

COPT Ridgeview II & III, LLC

COPT Southwest VA, LLC

COPT Stonecroft, LLC

COPT Sunrise, LLC

COPT Waterview I, LLC

COPT Waterview III, LLC

COPT Westbranch, LLC

Patriot Ridge I, LLC

Patriot Ridge II, LLC

Patriot Ridge 7770, LLC

Patriot Ridge Commons, LLC

Patriot Ridge Holdings, LLC

TRC Pinnacle Towers, L.L.C.

EX-23.1

Exhibit 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statements on Forms S-3 (No. 333-203031, No. 333-36740, No. 333-60379, No. 333-187841, and No. 333-190137) and S-8 (No. 333-87384, No. 333-88711, No. 333-111736, No. 333-118096, No. 333-118097, No. 333-151105, and No. 333-166989) of Corporate Office Properties Trust of our report dated February 25, 2016 relating to the financial statements, financial statement schedules and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Baltimore, MD

February 25, 2016

EX-23.2

Exhibit 23.2

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We hereby consent to the incorporation by reference in the Registration Statement on Form S-3 (No. 333-190137-01) of Corporate Office Properties, L.P. of our report dated February 25, 2016 relating to the financial statements, financial statement schedules and the effectiveness of internal control over financial reporting, which appears in this Form 10-K.

/s/ PricewaterhouseCoopers LLP

Baltimore, MD

February 25, 2016

EX-31.1

EXHIBIT 31.1

CORPORATE OFFICE PROPERTIES TRUST

CERTIFICATIONS REQUIRED BY

RULE 13a-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934

CERTIFICATIONS

I, Roger A. Waesche, Jr., certify that:

1. I have reviewed this annual report on Form 10-K of Corporate Office Properties Trust;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 25, 2016	/s/ Roger A. Waesche, Jr.
		Roger A. Waesche, Jr.
		President and Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CORPORATE OFFICE PROPERTIES TRUST

CERTIFICATIONS REQUIRED BY

RULE 13a-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934

CERTIFICATIONS

I, Anthony Mifsud, certify that:

1. I have reviewed this annual report on Form 10-K of Corporate Office Properties Trust;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting. 

Date:	February 25, 2016	/s/ Anthony Mifsud
		Anthony Mifsud
		Chief Financial Officer

EX-31.3

EXHIBIT 31.3

CORPORATE OFFICE PROPERTIES, L.P.

CERTIFICATIONS REQUIRED BY

RULE 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934

CERTIFICATIONS

I, Roger A. Waesche, Jr., certify that:

1. I have reviewed this annual report on Form 10-K of Corporate Office Properties, L.P.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 25, 2016	/s/ Roger A. Waesche, Jr.
		Roger A. Waesche, Jr.
		President and Chief Executive Officer

EX-31.4

EXHIBIT 31.4

CORPORATE OFFICE PROPERTIES, L.P.

CERTIFICATIONS REQUIRED BY

RULE 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934

CERTIFICATIONS

I, Anthony Mifsud, certify that:

1. I have reviewed this annual report on Form 10-K of Corporate Office Properties, L.P.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting. 

Date:	February 25, 2016	/s/ Anthony Mifsud
		Anthony Mifsud
		Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CORPORATE OFFICE PROPERTIES TRUST

CERTIFICATIONS REQUIRED BY

RULE 13a-14(b) UNDER THE SECURITIES EXCHANGE ACT OF 1934

In connection with the Annual Report on Form 10-K of Corporate Office Properties Trust (the “Company”) for the year ended December 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Roger A. Waesche, Jr., President and Chief Executive Officer of the Company, certify that to my knowledge:

(1)           The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)           The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Roger A. Waesche, Jr.
Roger A. Waesche, Jr.
President and Chief Executive Officer
Date:	February 25, 2016

EX-32.2

EXHIBIT 32.2

CORPORATE OFFICE PROPERTIES TRUST

CERTIFICATIONS REQUIRED BY

RULE 13a-14(b) UNDER THE SECURITIES EXCHANGE ACT OF 1934

In connection with the Annual Report on Form 10-K of Corporate Office Properties Trust (the “Company”) for the year ended December 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Anthony Mifsud, Chief Financial Officer of the Company, certify that to my knowledge:

(1)           The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)           The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Anthony Mifsud
Anthony Mifsud
Chief Financial Officer
Date:	February 25, 2016

EX-32.3

EXHIBIT 32.3

CORPORATE OFFICE PROPERTIES, L.P.

CERTIFICATIONS REQUIRED BY

RULE 15d-14(b) UNDER THE SECURITIES EXCHANGE ACT OF 1934

In connection with the Annual Report on Form 10-K of Corporate Office Properties, L.P. (the “Company”) for the year ended December 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Roger A. Waesche, Jr., President and Chief Executive Officer of the Company, certify that to my knowledge:

(1)           The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)           The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Roger A. Waesche, Jr.
Roger A. Waesche, Jr.
President and Chief Executive Officer
Date:	February 25, 2016

EX-32.4

EXHIBIT 32.4

CORPORATE OFFICE PROPERTIES, L.P.

CERTIFICATIONS REQUIRED BY

RULE 15d-14(b) UNDER THE SECURITIES EXCHANGE ACT OF 1934

In connection with the Annual Report on Form 10-K of Corporate Office Properties, L.P. (the “Company”) for the year ended December 31, 2015, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Anthony Mifsud, Chief Financial Officer of the Company, certify that to my knowledge:

(1)           The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)           The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Anthony Mifsud
Anthony Mifsud
Chief Financial Officer
Date:	February 25, 2016

XML

Document and Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Feb. 16, 2016	Jun. 30, 2015
Entity Information [Line Items]
Entity Registrant Name	CORPORATE OFFICE PROPERTIES TRUST
Entity Central Index Key	0000860546
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 2,200.0
Entity Common Stock, Shares Outstanding		94,528,118
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY
Corporate Office Properties, L.P. [Member]
Entity Information [Line Items]
Entity Registrant Name	CORPORATE OFFICE PROPERTIES, L.P.
Entity Central Index Key	0001577966
Document Type	10-K
Document Period End Date	Dec. 31, 2015
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float			$ 79.4
Document Fiscal Year Focus	2015
Document Fiscal Period Focus	FY

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Properties, net:
Operating properties, net	$ 2,920,529	$ 2,751,488
Projects in development or held for future development	429,219	545,426
Total properties, net	3,349,748	3,296,914
Assets held for sale, net	96,782	14,339
Cash and cash equivalents	60,310	6,077
Restricted cash and marketable securities	7,716	9,069
Accounts receivable (net of allowance for doubtful accounts of $1,525 and $717, respectively)	29,167	30,698
Deferred rent receivable (net of allowance of $1,962 and $1,418, respectively)	105,484	95,910
Intangible assets on real estate acquisitions, net	98,338	43,854
Deferred leasing costs (net of accumulated amortization of $66,364 and $69,998, respectively)	53,868	53,927
Investing receivables	47,875	52,147
Prepaid expenses and other assets, net	60,024	61,301
Total assets	3,909,312	3,664,236
Liabilities:
Debt, net	2,077,752	1,914,036
Accounts payable and accrued expenses	91,755	123,035
Rents received in advance and security deposits	37,148	31,011
Dividends and distributions payable	30,178	29,862
Deferred revenue associated with operating leases	19,758	13,031
Interest rate derivatives	3,160	1,855
Other liabilities	13,779	12,105
Total liabilities	$ 2,273,530	$ 2,124,935
Commitments and contingencies
Redeemable noncontrolling interest	$ 19,218	$ 18,417
Corporate Office Properties Trust’s shareholders’ equity:
Preferred Shares of beneficial interest at liquidation preference	199,083	199,083
Common Shares of beneficial interest ($0.01 par value; 125,000,000 shares authorized, shares issued and outstanding of 94,531,512 at December 31, 2015 and 93,255,284 at December 31, 2014)	945	933
Additional paid-in capital	2,004,507	1,969,968
Cumulative distributions in excess of net income	(657,172)	(717,264)
Accumulated other comprehensive loss	(2,838)	(1,297)
Total Corporate Office Properties Trust’s shareholders’ equity	1,544,525	1,451,423
Noncontrolling interests in subsidiaries:
Common units in COPLP	52,359	51,534
Preferred units in COPLP	8,800	8,800
Other consolidated entities	10,880	9,127
Noncontrolling interests in subsidiaries	72,039	69,461
Total equity	1,616,564	1,520,884
Total liabilities, redeemable noncontrolling interest and equity	3,909,312	3,664,236
Corporate Office Properties, L.P. [Member]
Properties, net:
Operating properties, net	2,920,529	2,751,488
Projects in development or held for future development	429,219	545,426
Total properties, net	3,349,748	3,296,914
Assets held for sale, net	96,782	14,339
Cash and cash equivalents	60,310	6,077
Restricted cash and marketable securities	1,953	3,187
Accounts receivable (net of allowance for doubtful accounts of $1,525 and $717, respectively)	29,167	30,698
Deferred rent receivable (net of allowance of $1,962 and $1,418, respectively)	105,484	95,910
Intangible assets on real estate acquisitions, net	98,338	43,854
Deferred leasing costs (net of accumulated amortization of $66,364 and $69,998, respectively)	53,868	53,927
Investing receivables	47,875	52,147
Prepaid expenses and other assets, net	60,024	61,301
Total assets	3,903,549	3,658,354
Liabilities:
Debt, net	2,077,752	1,914,036
Accounts payable and accrued expenses	91,755	123,035
Rents received in advance and security deposits	37,148	31,011
Dividends and distributions payable	30,178	29,862
Deferred revenue associated with operating leases	19,758	13,031
Interest rate derivatives	3,160	1,855
Other liabilities	8,016	6,223
Total liabilities	$ 2,267,767	$ 2,119,053
Commitments and contingencies
Redeemable noncontrolling interest	$ 19,218	$ 18,417
Corporate Office Properties Trust’s shareholders’ equity:
Preferred Shares of beneficial interest at liquidation preference	199,083
Common Shares of beneficial interest ($0.01 par value; 125,000,000 shares authorized, shares issued and outstanding of 94,531,512 at December 31, 2015 and 93,255,284 at December 31, 2014)	1,400,745	1,305,219
Accumulated other comprehensive loss	(2,985)	(1,381)
Total Corporate Office Properties Trust’s shareholders’ equity	1,605,643	1,511,721
Noncontrolling interests in subsidiaries:
Noncontrolling interests in subsidiaries	10,921	9,163
Total equity	1,616,564	1,520,884
Total liabilities, redeemable noncontrolling interest and equity	3,903,549	3,658,354
Corporate Office Properties, L.P. [Member] | General Partner [Member]
Corporate Office Properties Trust’s shareholders’ equity:
Preferred Units, Preferred Partners' Capital Accounts	199,083	199,083
Corporate Office Properties, L.P. [Member] | Limited Partner [Member]
Corporate Office Properties Trust’s shareholders’ equity:
Preferred Units, Preferred Partners' Capital Accounts	$ 8,800	$ 8,800

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Allowance for doubtful accounts- AR	$ 1,525	$ 717
Allowance for deferred rent receivable	1,962	1,418
Accumulated amortization of deferred leasing costs	$ 66,364	$ 69,998
Common Shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Common Shares of beneficial interest, shares authorized	125,000,000	125,000,000
Common Shares of beneficial interest, shares issued	94,531,512	93,255,284
Common Shares of beneficial interest, shares outstanding	94,531,512	93,255,284
Corporate Office Properties, L.P. [Member]
Allowance for doubtful accounts- AR	$ 1,525	$ 717
Allowance for deferred rent receivable	1,962	1,418
Accumulated amortization of deferred leasing costs	$ 66,364	$ 69,998
General Partner [Member] | Corporate Office Properties, L.P. [Member]
Preferred Units, Outstanding	7,431,667	7,431,667
Common Shares of beneficial interest, shares outstanding	94,531,512	93,255,284
Limited Partner [Member] | Corporate Office Properties, L.P. [Member]
Preferred Units, Outstanding	352,000	352,000
Common Shares of beneficial interest, shares outstanding	3,677,391	3,837,551

XML

Consolidated Statements of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues
Rental revenue		$ 420,340	$ 386,396	$ 377,611
Tenant recoveries and other real estate operations revenue		98,724	93,329	83,386
Construction contract and other service revenues		106,402	106,748	62,363
Total revenues		625,466	586,473	523,360
Expenses
Property operating expenses		194,494	179,934	167,199
Depreciation and amortization associated with real estate operations		140,025	136,086	113,214
Construction contract and other service expenses		102,696	100,058	58,875
Impairment losses		23,289	1,416	5,857
General, administrative and leasing expenses		31,361	31,794	30,869
Business development expenses and land carry costs		13,507	5,573	5,436
Total operating expenses		505,372	454,861	381,450
Operating income		120,094	131,612	141,910
Interest expense		(89,074)	(92,393)	(82,010)
Interest and other income		4,517	4,923	3,834
Gain (loss) on early extinguishment of debt		85,275	(9,552)	(27,030)
Income from continuing operations before equity in income of unconsolidated entities and income taxes		120,812	34,590	36,704
Equity in income of unconsolidated entities		62	229	2,110
Income tax expense		(199)	(310)	(1,978)
Income from continuing operations		120,675	34,509	36,836
Discontinued operations		156	26	55,692
Income before gain on sales of real estate		120,831	34,535	92,528
Gain on sales of real estate, net of income taxes		68,047	10,671	9,016
Net income		188,878	45,206	101,544
Net income attributable to noncontrolling interests:
Common units in COPLP		(6,403)	(1,006)	(3,283)
Preferred units in COPLP		(660)	(660)	(660)
Other consolidated entities		(3,515)	(3,285)	(3,894)
Net income		178,300	40,255	93,707
Preferred share/ unit dividends/ distributions		(14,210)	(15,939)	(19,971)
Issuance costs associated with redeemed preferred shares		0	(1,769)	(2,904)
Net income attributable to COPT common shareholders		164,090	22,547	70,832
Net income attributable to COPT:
Income from continuing operations		178,147	40,225	41,366
Discontinued operations, net		153	30	52,341
Net income		$ 178,300	$ 40,255	$ 93,707
Basic earnings per common share
Income from continuing operations (in dollars per share/unit)	[1]	$ 1.74	$ 0.25	$ 0.21
Discontinued operations (in dollars per share/unit)	[1]	0.00	0.00	0.62
Net income attributable to COPT common shareholders (in dollars per share/unit)	[1]	1.74	0.25	0.83
Diluted earnings per common share
Income from continuing operations (in dollars per share/unit)	[1]	1.74	0.25	0.21
Discontinued operations (in dollars per share/unit)	[1]	0.00	0.00	0.62
Net income attributable to COPT common shareholders (in dollars per share/unit)	[1]	$ 1.74	$ 0.25	$ 0.83
Corporate Office Properties, L.P. [Member]
Revenues
Rental revenue		$ 420,340	$ 386,396	$ 377,611
Tenant recoveries and other real estate operations revenue		98,724	93,329	83,386
Construction contract and other service revenues		106,402	106,748	62,363
Total revenues		625,466	586,473	523,360
Expenses
Property operating expenses		194,494	179,934	167,199
Depreciation and amortization associated with real estate operations		140,025	136,086	113,214
Construction contract and other service expenses		102,696	100,058	58,875
Impairment losses		23,289	1,416	5,857
General, administrative and leasing expenses		31,361	31,794	30,869
Business development expenses and land carry costs		13,507	5,573	5,436
Total operating expenses		505,372	454,861	381,450
Operating income		120,094	131,612	141,910
Interest expense		(89,074)	(92,393)	(82,010)
Interest and other income		4,517	4,923	3,834
Gain (loss) on early extinguishment of debt		85,275	(9,552)	(27,030)
Income from continuing operations before equity in income of unconsolidated entities and income taxes		120,812	34,590	36,704
Equity in income of unconsolidated entities		62	229	2,110
Income tax expense		(199)	(310)	(1,978)
Income from continuing operations		120,675	34,509	36,836
Discontinued operations		156	26	55,692
Income before gain on sales of real estate		120,831	34,535	92,528
Gain on sales of real estate, net of income taxes		68,047	10,671	9,016
Net income		188,878	45,206	101,544
Net income attributable to noncontrolling interests in consolidated entities		(3,520)	(3,276)	(3,907)
Net income attributable to noncontrolling interests:
Net income		185,358	41,930	97,637
Preferred share/ unit dividends/ distributions		(14,870)	(16,599)	(20,631)
Issuance costs associated with redeemed preferred shares		0	(1,769)	(2,904)
Net income attributable to COPT common shareholders		170,488	23,562	74,102
Net income attributable to COPT:
Income from continuing operations		185,199	41,899	42,875
Discontinued operations, net		159	31	54,762
Net income		$ 185,358	$ 41,930	$ 97,637
Basic earnings per common share
Income from continuing operations (in dollars per share/unit)	[2]	$ 1.74	$ 0.25	$ 0.21
Discontinued operations (in dollars per share/unit)	[2]	0.00	0.00	0.62
Net income attributable to COPT common shareholders (in dollars per share/unit)	[2]	1.74	0.25	0.83
Diluted earnings per common share
Income from continuing operations (in dollars per share/unit)	[2]	1.74	0.25	0.21
Discontinued operations (in dollars per share/unit)	[2]	0.00	0.00	0.62
Net income attributable to COPT common shareholders (in dollars per share/unit)	[2]	$ 1.74	$ 0.25	$ 0.83

[1] Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.

[2] Basic and diluted earnings per common unit are calculated based on amounts attributable to common unitholders of Corporate Office Properties, L.P.

XML

Consolidated Statements of Comprehensive Income/Loss - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Net income	$ 188,878	$ 45,206	$ 101,544
Other comprehensive (loss) income
Amount of (losses) gains recognized in accumulated other comprehensive income (loss) (“AOCI”) (effective portion)	(4,739)	(7,799)	6,791
Unrealized equity in other comprehensive (loss) income of equity method investee	(264)	0	1,070
Realized equity in other comprehensive income of equity method investee	0	0	(1,070)
Other comprehensive (loss) income	(1,404)	(4,771)	9,531
Comprehensive income	187,474	40,435	111,075
Comprehensive income attributable to noncontrolling interests	(10,715)	(4,957)	(8,453)
Comprehensive income attributable to COPT	176,759	35,478	102,622
Interest expense [Member]
Other comprehensive (loss) income
Losses on interest rate derivatives	3,599	2,990	2,740
Loss on early extinguishment of debt [Member]
Other comprehensive (loss) income
Losses on interest rate derivatives	0	38	0
Corporate Office Properties, L.P. [Member]
Net income	188,878	45,206	101,544
Other comprehensive (loss) income
Amount of (losses) gains recognized in accumulated other comprehensive income (loss) (“AOCI”) (effective portion)	(4,739)	(7,799)	6,791
Unrealized equity in other comprehensive (loss) income of equity method investee	(264)	0	1,070
Realized equity in other comprehensive income of equity method investee	0	0	(1,070)
Other comprehensive (loss) income	(1,404)	(4,771)	9,531
Comprehensive income	187,474	40,435	111,075
Comprehensive income attributable to noncontrolling interests	(3,720)	(3,492)	(4,125)
Comprehensive income attributable to COPT	183,754	36,943	106,950
Corporate Office Properties, L.P. [Member] | Interest expense [Member]
Other comprehensive (loss) income
Losses on interest rate derivatives	3,599	2,990	2,740
Corporate Office Properties, L.P. [Member] | Loss on early extinguishment of debt [Member]
Other comprehensive (loss) income
Losses on interest rate derivatives	$ 0	$ 38	$ 0

XML

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Shares [Member]	Preferred Shares [Member]	Common Shares [Member]	Additional Paid-in Capital [Member]	Additional Paid-in Capital [Member] Common Shares [Member]	Cumulative Distributions in Excess of Net Income [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Noncontrolling Interests in Subsidiaries [Member]	Corporate Office Properties, L.P. [Member]	Corporate Office Properties, L.P. [Member] Common Shares [Member]	Corporate Office Properties, L.P. [Member] Accumulated Other Comprehensive Income (Loss) [Member]	Corporate Office Properties, L.P. [Member] Noncontrolling Interests in Subsidiaries [Member]	Corporate Office Properties, L.P. [Member] Limited Partner [Member]	Corporate Office Properties, L.P. [Member] Limited Partner [Member] Preferred Shares [Member]	Corporate Office Properties, L.P. [Member] General Partner [Member]	Corporate Office Properties, L.P. [Member] General Partner [Member] Preferred Shares [Member]
Balance at Dec. 31, 2012	$ 1,436,499		$ 333,833	$ 809	$ 1,653,672		$ (617,455)	$ (5,435)	$ 71,075	$ 1,436,499	$ 1,089,391	$ (5,708)	$ 10,183		$ 8,800		$ 333,833
Balance (in units/ shares) at Dec. 31, 2012	80,952,986										85,020,528
Balance (preferred units) at Dec. 31, 2012															352,000		12,821,667
Increase (Decrease) in Shareholders' Equity
Redemption of preferred shares/units			(3,390,000)														(3,390,000)
Redemption of preferred shares/units (3,390,000 and 2,000,000 shares in 2013 and 2014, respectively)	$ (84,750)		$ (84,750)		2,904		(2,904)			(84,750)							$ (84,750)
Conversion of common units to common shares (311,343, 140,149 and 160,160 shares in 2013, 2014 and 2015 respectively)	0			3	3,994				(3,997)
Shares issued to the public (4,485,000 and 5,520,000 common shares in 2013 and 2014, respectively)(in dollars)	117,961			$ 45	117,916					117,961	$ 117,961
Shares issued to the public (in units/shares)				4,485,000							4,485,000
Issuance of common units resulting from common shares issued under at-the-market program (in units)											1,500,000
Issuance of common units resulting from common shares issued under at-the-market program (1,500,000 shares in 2013 and 890,241 shares in 2015) (in dollars)		$ 38,447		$ 15		$ 38,432				38,447	$ 38,447
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units	$ 1,369				(1,296)				2,665
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in units)											221,501
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars)										1,369	$ 3,899		(2,530)
Exercise of share options (in units/shares)	39,331										39,331
Exercise of share options (39,331, 62,888 and 76,474 shares in 2013, 2014 and 2015 respectively)(in dollars)	$ 779				779					779	$ 779
Share-based compensation (105,852, 137,735 and 149,353 shares issued in 2013, 2014 and 2015)	$ 7,605			2	7,603					7,605	$ 7,605
Share-based compensation (in shares/units)	105,852										105,852
Redemptions of vested equity awards	$ (2,002)				(2,002)					(2,002)	$ (2,002)
Contributions from noncontrolling interests	0				(744)				744
Comprehensive income	109,699						93,707	8,915	7,077	109,699	77,006	9,313	2,749		$ 660		19,971
Dividends/Distributions	(115,216)						(115,216)			(120,156)	(99,525)				$ (660)		$ (19,971)
Distributions to owners of common and preferred units in COPLP	(4,940)								(4,940)
Contributions from noncontrolling interests in other consolidates entities	86								86	86			86
Distributions to noncontrolling interests	(1,045)								(1,045)	(1,045)			(1,045)
Adjustment to arrive at fair value of redeemable noncontrolling interest	(7,121)				(7,121)					(7,121)	(7,121)
Tax loss from share-based compensation	$ (122)				(122)					(122)	$ (122)
Balance (preferred units) at Dec. 31, 2013															352,000		9,431,667
Balance (in units/ shares) at Dec. 31, 2013	87,394,512										91,372,212
Balance at Dec. 31, 2013	$ 1,497,249		$ 249,083	874	1,814,015		(641,868)	3,480	71,665	1,497,249	$ 1,226,318	3,605	9,443		$ 8,800		$ 249,083
Increase (Decrease) in Shareholders' Equity
Redemption of preferred shares/units			(2,000,000)														(2,000,000)
Redemption of preferred shares/units (3,390,000 and 2,000,000 shares in 2013 and 2014, respectively)	(50,000)		$ (50,000)		1,769		(1,769)			(50,000)							$ (50,000)
Conversion of common units to common shares (311,343, 140,149 and 160,160 shares in 2013, 2014 and 2015 respectively)	0			2	1,841				(1,843)
Shares issued to the public (4,485,000 and 5,520,000 common shares in 2013 and 2014, respectively)(in dollars)	$ 148,666			$ 55	148,611					148,666	$ 148,666
Shares issued to the public (in units/shares)				5,520,000							5,520,000
Exercise of share options (in units/shares)	62,888										62,888
Exercise of share options (39,331, 62,888 and 76,474 shares in 2013, 2014 and 2015 respectively)(in dollars)	$ 1,489			$ 0	1,489					1,489	$ 1,489
Share-based compensation (105,852, 137,735 and 149,353 shares issued in 2013, 2014 and 2015)	$ 7,050			2	7,048					7,050	$ 7,050
Share-based compensation (in shares/units)	137,735										137,735
Redemptions of vested equity awards	$ (1,554)				(1,554)					(1,554)	$ (1,554)
Contributions from noncontrolling interests	0				(3,382)				3,382
Comprehensive income	38,274						40,255	(4,777)	2,796	38,274	25,331	(4,986)	1,330		660		15,939
Dividends/Distributions	(113,882)						(113,882)			(118,811)	(102,212)				$ (660)		$ (15,939)
Distributions to owners of common and preferred units in COPLP	(4,929)								(4,929)
Contributions from noncontrolling interests in other consolidates entities	3				0				3	3			3
Distributions to noncontrolling interests	(1,613)								(1,613)	(1,613)			(1,613)
Adjustment to arrive at fair value of redeemable noncontrolling interest	134				134					134	134
Tax loss from share-based compensation	$ (3)				(3)					(3)	$ (3)
Balance (preferred units) at Dec. 31, 2014														352,000	352,000	7,431,667	7,431,667
Balance (in units/ shares) at Dec. 31, 2014	93,255,284										97,092,835			3,837,551		93,255,284
Balance at Dec. 31, 2014	$ 1,520,884		199,083	933	1,969,968		(717,264)	(1,297)	69,461	1,520,884	$ 1,305,219	(1,381)	9,163		$ 8,800		$ 199,083
Increase (Decrease) in Shareholders' Equity
Conversion of common units to common shares (311,343, 140,149 and 160,160 shares in 2013, 2014 and 2015 respectively)	0			2	2,149				(2,151)
Issuance of common units resulting from common shares issued under at-the-market program (in units)											890,241
Issuance of common units resulting from common shares issued under at-the-market program (1,500,000 shares in 2013 and 890,241 shares in 2015) (in dollars)	$ 26,535			9	26,526					26,535	$ 26,535
Exercise of share options (in units/shares)	76,474										76,474
Exercise of share options (39,331, 62,888 and 76,474 shares in 2013, 2014 and 2015 respectively)(in dollars)	$ 2,008				2,008					2,008	$ 2,008
Share-based compensation (105,852, 137,735 and 149,353 shares issued in 2013, 2014 and 2015)	$ 7,398			1	7,397					7,398	$ 7,398
Share-based compensation (in shares/units)	149,353										149,353
Redemptions of vested equity awards	$ (2,462)				(2,462)					(2,462)	$ (2,462)
Contributions from noncontrolling interests	0				(682)				682
Comprehensive income	185,247						178,300	(1,541)	8,488	185,247	170,488	(1,604)	1,493		660		14,210
Dividends/Distributions	(118,208)						(118,208)			(122,914)	(108,044)				$ (660)		$ (14,210)
Distributions to owners of common and preferred units in COPLP	(4,706)								(4,706)
Contributions from noncontrolling interests in other consolidates entities	300								300	300			300
Distributions to noncontrolling interests	(35)								(35)	(35)			(35)
Adjustment to arrive at fair value of redeemable noncontrolling interest	116				116					116	116
Tax loss from share-based compensation	$ (513)				(513)					(513)	$ (513)
Balance (preferred units) at Dec. 31, 2015														352,000	352,000	7,431,667	7,431,667.000
Balance (in units/ shares) at Dec. 31, 2015	94,531,512										98,208,903.000			3,677,391		94,531,512
Balance at Dec. 31, 2015	$ 1,616,564		$ 199,083	$ 945	$ 2,004,507		$ (657,172)	$ (2,838)	$ 72,039	$ 1,616,564	$ 1,400,745	$ (2,985)	$ 10,921		$ 8,800		$ 199,083

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Consolidated Statements of Equity (Parenthetical) - shares		1 Months Ended	12 Months Ended
	Jul. 15, 2013	Nov. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Balance (in units/ shares)			94,531,512	93,255,284	87,394,512	80,952,986
Conversion of common units to common shares (in shares/units)			160,160	140,149	311,343
Shares issued to the public (in units/shares)		5,520,000
Exercise of share options (in units/shares)			76,474	62,888	39,331
Restricted common units/shares redemptions			149,353	137,735	105,852
Preferred Shares [Member]
Stock redeemed or called during period (in units/ shares)				(2,000,000)	(3,390,000)
Common Shares [Member]
Shares issued to the public (in units/shares)				5,520,000	4,485,000
Common Stock Issued to Public Under At-the-Market Program [Member]
Shares issued to the public (in units/shares)	1,500,000.0		890,241		1,500,000

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Consolidated Statements of Cash Flows $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Cash flows from operating activities
Revenues from real estate operations received	$ 501,779	$ 479,605	$ 482,763
Construction contract and other service revenues received	117,107	89,180	63,647
Property operating expenses paid	(190,281)	(178,803)	(176,243)
Construction contract and other service expenses paid	(124,481)	(79,271)	(63,853)
General, administrative, leasing, business development and land carry costs paid	(38,113)	(29,521)	(28,022)
Interest expense paid	(65,816)	(79,095)	(81,575)
Previously accreted interest expense paid	0	0	(11,116)
Exit costs on property dispositions	0	0	(979)
Payments in connection with early extinguishment of debt	(373)	(9,017)	(27,909)
Interest and other income received	4,194	607	2,260
Income taxes refunded (paid)	(8)	200	6
Net cash provided by operating activities	204,008	193,885	158,979
Cash flows from investing activities
Acquisitions of operating properties and related intangible assets	(202,866)	0	0
Construction, development and redevelopment	(234,346)	(200,385)	(201,808)
Tenant improvements on operating properties	(29,413)	(27,037)	(21,950)
Other capital improvements on operating properties	(23,147)	(28,720)	(23,940)
Proceeds from dispositions of properties	193,735	57,782	148,569
Investing receivables funded	(22)	(3,731)	(14,077)
Investing receivables payments received	5,114	10,279	144
Leasing costs paid	(13,710)	(16,234)	(14,429)
Decrease in restricted cash associated with investing activities	1,455	1,137	8,178
Other	(4,332)	(2,780)	(477)
Net cash used in investing activities	(307,532)	(209,689)	(119,790)
Proceeds from debt
Revolving Credit Facility	522,000	232,000	504,000
Unsecured senior notes	296,580	297,342	592,413
Other debt proceeds	164,000	11,569	94,049
Repayments of debt
Revolving Credit Facility	(561,500)	(149,000)	(504,000)
Scheduled principal amortization	(6,728)	(6,517)	(9,481)
Other debt repayments	(155,307)	(394,653)	(612,093)
Deferred financing costs paid	(7,522)	(708)	(9,361)
Net proceeds from issuance of common shares	28,567	150,174	157,444
Redemption of preferred shares	0	(50,000)	(84,750)
Common share/unit dividends/distributions paid	(103,638)	(96,330)	(93,474)
Preferred share/unit dividends/distributions paid	(14,210)	(16,731)	(21,335)
Distributions paid to noncontrolling interests in COPLP	(4,752)	(5,008)	(4,958)
Redemption of vested equity awards	(2,462)	(1,554)	(2,002)
Other	2,729	(3,076)	(1,862)
Net cash provided by (used in) financing activities	157,757	(32,492)	4,590
Net increase (decrease) in cash and cash equivalents	54,233	(48,296)	43,779
Cash and cash equivalents
Beginning of period	6,077	54,373	10,594
End of period	60,310	6,077	54,373
Reconciliation of net income to net cash provided by operating activities:
Net income	188,878	45,206	101,544
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and other amortization	142,231	138,490	119,773
Impairment losses	23,523	1,419	31,068
Settlement of previously accreted interest expense	0	0	(11,116)
Amortization of deferred financing costs	4,466	4,666	5,451
Increase in deferred rent receivable	(14,969)	(3,520)	(5,196)
Amortization of net debt discounts	1,122	921	1,159
Gain on sales of real estate	(68,047)	(10,695)	(11,687)
Share-based compensation	6,574	6,164	6,530
(Gain) loss on early extinguishment of debt	(86,028)	651	(68,689)
Other	528	(3,242)	(3,093)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	1,331	(2,011)	(11,698)
Decrease in restricted cash and marketable securities	(1,241)	1,352	576
Decrease (increase) in prepaid expenses and other assets, net	2,853	(10,126)	(3,764)
(Decrease) increase in accounts payable, accrued expenses and other liabilities	(3,620)	25,091	3,960
Increase (decrease) in rents received in advance and security deposits	6,407	(481)	4,161
Net cash provided by operating activities	204,008	193,885	158,979
Supplemental schedule of non-cash investing and financing activities:
(Decrease) increase in accrued capital improvements, leasing and other investing activity costs	(14,797)	(3,779)	2,947
Debt assumed on acquisition of operating property	55,490	0	0
Other liabilities assumed on acquisition of operating properties	5,179	0	0
Decrease in property in connection with transfer of property in settlement of debt	(82,738)	0	(73,780)
Decrease in debt in connection with transfer of property in settlement of debt	(150,000)	0	(146,500)
Increase in property and redeemable noncontrolling interests in connection with property contribution by a redeemable noncontrolling interest in a joint venture	1,415	0	0
(Decrease) increase in fair value of derivatives applied to accumulated other comprehensive income (loss) and noncontrolling interests	(1,140)	(4,866)	9,470
Equity in other comprehensive loss of an equity method investee	(264)	0	0
Dividends/distribution payable	30,178	29,862	29,080
COPLP common units issued to acquire property and noncontrolling interest in other consolidated entity	0	0	5,194
Decrease in noncontrolling interests and increase in shareholders’ equity in connection with the conversion of common units into common shares	2,151	1,843	3,997
Adjustments to noncontrolling interests resulting from changes in COPLP ownership	682	3,382	744
(Decrease) increase in redeemable noncontrolling interest and (increase) decrease in equity to carry redeemable noncontrolling interests at fair value	(116)	(134)	7,121
Corporate Office Properties, L.P. [Member]
Cash flows from operating activities
Revenues from real estate operations received	501,779	479,605	482,763
Construction contract and other service revenues received	117,107	89,180	63,647
Property operating expenses paid	(190,281)	(178,803)	(176,243)
Construction contract and other service expenses paid	(124,481)	(79,271)	(63,853)
General, administrative, leasing, business development and land carry costs paid	(38,113)	(29,521)	(28,022)
Interest expense paid	(65,816)	(79,095)	(81,575)
Previously accreted interest expense paid	0	0	(11,116)
Exit costs on property dispositions	0	0	(979)
Payments in connection with early extinguishment of debt	(373)	(9,017)	(27,909)
Interest and other income received	4,194	607	2,260
Income taxes refunded (paid)	(8)	200	6
Net cash provided by operating activities	204,008	193,885	158,979
Cash flows from investing activities
Acquisitions of operating properties and related intangible assets	(202,866)	0	0
Construction, development and redevelopment	(234,346)	(200,385)	(201,808)
Tenant improvements on operating properties	(29,413)	(27,037)	(21,950)
Other capital improvements on operating properties	(23,147)	(28,720)	(23,940)
Proceeds from dispositions of properties	193,735	57,782	148,569
Investing receivables funded	(22)	(3,731)	(14,077)
Investing receivables payments received	5,114	10,279	144
Leasing costs paid	(13,710)	(16,234)	(14,429)
Decrease in restricted cash associated with investing activities	1,455	1,137	8,178
Other	(4,332)	(2,780)	(477)
Net cash used in investing activities	(307,532)	(209,689)	(119,790)
Proceeds from debt
Revolving Credit Facility	522,000	232,000	504,000
Unsecured senior notes	296,580	297,342	592,413
Other debt proceeds	164,000	11,569	94,049
Repayments of debt
Revolving Credit Facility	(561,500)	(149,000)	(504,000)
Scheduled principal amortization	(6,728)	(6,517)	(9,481)
Other debt repayments	(155,307)	(394,653)	(612,093)
Deferred financing costs paid	(7,522)	(708)	(9,361)
Net proceeds from issuance of common shares	28,567	150,174	157,444
Redemption of preferred shares	0	(50,000)	(84,750)
Common share/unit dividends/distributions paid	(107,730)	(100,678)	(97,772)
Preferred share/unit dividends/distributions paid	(14,870)	(17,391)	(21,995)
Redemption of vested equity awards	(2,462)	(1,554)	(2,002)
Other	2,729	(3,076)	(1,862)
Net cash provided by (used in) financing activities	157,757	(32,492)	4,590
Net increase (decrease) in cash and cash equivalents	54,233	(48,296)	43,779
Cash and cash equivalents
Beginning of period	6,077	54,373	10,594
End of period	60,310	6,077	54,373
Reconciliation of net income to net cash provided by operating activities:
Net income	188,878	45,206	101,544
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and other amortization	142,231	138,490	119,773
Impairment losses	23,523	1,419	31,068
Settlement of previously accreted interest expense	0	0	(11,116)
Amortization of deferred financing costs	4,466	4,666	5,451
Increase in deferred rent receivable	(14,969)	(3,520)	(5,196)
Amortization of net debt discounts	1,122	921	1,159
Gain on sales of real estate	(68,047)	(10,695)	(11,687)
Share-based compensation	6,574	6,164	6,530
(Gain) loss on early extinguishment of debt	(86,028)	651	(68,689)
Other	528	(3,242)	(3,093)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	1,331	(2,011)	(11,698)
Decrease in restricted cash and marketable securities	(1,360)	(234)	1,267
Decrease (increase) in prepaid expenses and other assets, net	2,853	(10,126)	(3,764)
(Decrease) increase in accounts payable, accrued expenses and other liabilities	(3,501)	26,677	3,269
Increase (decrease) in rents received in advance and security deposits	6,407	(481)	4,161
Net cash provided by operating activities	204,008	193,885	158,979
Supplemental schedule of non-cash investing and financing activities:
(Decrease) increase in accrued capital improvements, leasing and other investing activity costs	(14,797)	(3,779)	2,947
Debt assumed on acquisition of operating property	55,490	0	0
Other liabilities assumed on acquisition of operating properties	5,179	0	0
Decrease in property in connection with transfer of property in settlement of debt	(82,738)	0	(73,780)
Decrease in debt in connection with transfer of property in settlement of debt	(150,000)	0	(146,500)
Increase in property and redeemable noncontrolling interests in connection with property contribution by a redeemable noncontrolling interest in a joint venture	1,415	0	0
(Decrease) increase in fair value of derivatives applied to accumulated other comprehensive income (loss) and noncontrolling interests	(1,140)	(4,866)	9,470
Equity in other comprehensive loss of an equity method investee	(264)	0	0
Dividends/distribution payable	30,178	29,862	29,080
COPLP common units issued to acquire property and noncontrolling interest in other consolidated entity	0	0	5,194
(Decrease) increase in redeemable noncontrolling interest and (increase) decrease in equity to carry redeemable noncontrolling interests at fair value	$ (116)	$ (134)	$ 7,121

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Organization

12 Months Ended

Dec. 31, 2015

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

Organization

Corporate Office Properties Trust (“COPT”) and subsidiaries (collectively, the “Company”) is a fully-integrated and self-managed real estate investment trust (“REIT”). Corporate Office Properties, L.P. (“COPLP”) and subsidiaries (collectively, the “Operating Partnership”) is the entity through which COPT, the sole general partner of COPLP, conducts almost all of its operations and owns almost all of its assets. Unless otherwise expressly stated or the context otherwise requires, “we”, “us” and “our” as used herein refer to each of the Company and the Operating Partnership. We own, manage, lease, develop and selectively acquire office and data center properties. The majority of our portfolio is in locations that support United States Government agencies and their contractors, most of whom are engaged in national security, defense and information technology (“IT”) related activities servicing what we believe are growing, durable priority missions (“Defense/IT Locations”). We also own a complementary portfolio of traditional office properties located in select urban/urban-like submarkets within our regional footprint with durable Class-A office fundamentals and characteristics, as well as other properties supporting general commercial office tenants (“Regional Office”). As of December 31, 2015, our properties included the following (all references to number of properties, square footage, acres and megawatts are unaudited):

• 177 operating office properties totaling 18.1 million square feet, including nine triple-net leased, single-tenant data center properties;

• 13 office properties under, or contractually committed for, construction or redevelopment that we estimate will total approximately 1.5 million square feet upon completion, including one partially operational property included above;

• 1,439 acres of land we control that we believe are potentially developable into approximately 17.6 million square feet; and

• a wholesale data center with a critical load of 19.25 megawatts.

COPLP owns real estate both directly and through subsidiary partnerships and limited liability companies (“LLCs”).  In addition to owning real estate, COPLP also owns subsidiaries that provide real estate services such as property management and construction and development services primarily for our properties but also for third parties. Some of these services are performed by a taxable REIT subsidiary (“TRS”).

Equity interests in COPLP are in the form of common and preferred units. As of December 31, 2015, COPT owned 96.3% of the outstanding COPLP common units (“common units”) and 95.5% of the outstanding COPLP preferred units (“preferred units”); the remaining common and preferred units in COPLP were owned by third parties. Common units in COPLP not owned by COPT carry certain redemption rights. The number of common units in COPLP owned by COPT is equivalent to the number of outstanding common shares of beneficial interest (“common shares”) of COPT, and the entitlement of all COPLP common units to quarterly distributions and payments in liquidation is substantially the same as those of COPT common shareholders. Similarly, in the case of each series of preferred units in COPLP held by COPT, there is a series of preferred shares of beneficial interest (“preferred shares”) in COPT that is equivalent in number and carries substantially the same terms as such series of COPLP preferred units. COPT’s common shares are publicly traded on the New York Stock Exchange (“NYSE”) under the ticker symbol “OFC”.

Because COPLP is managed by COPT, and COPT conducts substantially all of its operations through COPLP, we refer to COPT’s executive officers as COPLP’s executive officers, and although, as a partnership, COPLP does not have a board of trustees, we refer to COPT’s Board of Trustees as COPLP’s Board of Trustees.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation

The COPT consolidated financial statements include the accounts of COPT, the Operating Partnership, their subsidiaries and other entities in which COPT has a majority voting interest and control.  The COPLP consolidated financial statements include the accounts of COPLP, its subsidiaries and other entities in which COPLP has a majority voting interest and control.  We also consolidate certain entities when control of such entities can be achieved through means other than voting rights (“variable interest entities” or “VIEs”) if we are deemed to be the primary beneficiary of such entities.  We eliminate all intercompany balances and transactions in consolidation.

We use the equity method of accounting when we own an interest in an entity and can exert significant influence over but cannot control the entity’s operations. We discontinue equity method accounting if our investment in an entity (and net advances) is reduced to zero unless we have guaranteed obligations of the entity or are otherwise committed to provide further financial support for the entity.

We use the cost method of accounting when we own an interest in an entity and cannot exert significant influence over its operations.

Reclassification

We reclassified certain amounts from prior periods to conform to the current period presentation of our consolidated financial statements, including amounts related to our adoption of guidance regarding the presentation of deferred debt issuance costs (discussed below) and our change in reportable segments (discussed in Note 17), with no effect on previously reported net income or equity.

Use of Estimates in the Preparation of Financial Statements

We make estimates and assumptions when preparing financial statements under generally accepted accounting principles (“GAAP”). These estimates and assumptions affect various matters, including:

• the reported amounts of assets and liabilities in our consolidated balance sheets at the dates of the financial statements;

• the disclosure of contingent assets and liabilities at the dates of the financial statements; and

• the reported amounts of revenues and expenses in our consolidated statements of operations during the reporting periods.

Significant estimates are inherent in the presentation of our financial statements in a number of areas, including the evaluation of the collectability of accounts and deferred rent receivable, the allocation of property acquisition costs, the determination of estimated useful lives of assets, the determination of lease terms, the evaluation of impairment of long-lived assets, the amount of impairment losses recognized, the amount of revenue recognized relating to tenant improvements, the level of expense recognized in connection with share-based compensation and the determination of accounting method for investments. Actual results could differ from these and other estimates.

Acquisitions of Properties

Upon completion of property acquisitions, we allocate the purchase price to tangible and intangible assets and liabilities associated with such acquisitions based on our estimates of their fair values. We determine these fair values by using market data and independent appraisals available to us and making numerous estimates and assumptions. We allocate property acquisitions to the following components:

• properties based on a valuation performed under the assumption that the property is vacant upon acquisition (the “if-vacant value”). The if-vacant value is allocated between land and buildings or, in the case of properties under development, construction in progress. We also allocate additional amounts to properties for in-place tenant improvements based on our estimate of improvements per square foot provided under market leases that would be attributable to the remaining non-cancelable terms of the respective leases;

• above- and below-market lease intangible assets or liabilities based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between: (1) the contractual amounts to be received pursuant to the in-place leases; and (2) our estimate of fair market lease rates for the corresponding space, measured over a period equal to the remaining non-cancelable term of the lease. The capitalized above- and below-market lease values are amortized as adjustments to rental revenue over the remaining lease terms of the respective leases, and to renewal periods in the case of below-market leases;

• in-place lease value based on our estimates of: (1) the present value of additional income to be realized as a result of leases being in place on the acquired properties; and (2) costs to execute similar leases. Our estimate of additional income to be realized includes carrying costs, such as real estate taxes, insurance and other operating expenses, and revenues during the expected lease-up periods considering current market conditions. Our estimate of costs to execute similar leases includes leasing commissions, legal and other related costs;

• tenant relationship value based on our evaluation of the specific characteristics of each tenant's lease and our overall relationship with that respective tenant. Characteristics we consider in determining these values include the nature and extent of our existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant's credit quality and expectations of lease renewals, among other factors; and

• above- and below- market cost arrangements (such as real estate tax treaties or above- or below- market ground leases) based on the present value of the expected benefit from any such arrangements in place on the property at the time of acquisition.

Intangible Assets and Deferred Revenue on Real Estate Acquisitions

We amortize the intangible assets and deferred revenue on real estate acquisitions discussed above as follows:

Asset Type	Amortization Period
Above- and below-market leases	Related lease terms
In-place lease value	Related lease terms
Tenant relationship value	Estimated period of time that tenant will lease space in property
Above- and below-market cost arrangements	Term of arrangements

We recognize the amortization of acquired above-market and below-market leases as adjustments to rental revenue. We recognize the amortization of above- and below- market cost arrangements as adjustments to property operating expenses. We recognize the amortization of other intangible assets on property acquisitions as amortization expense.

Properties

We report properties to be developed or held and used in operations at our depreciated cost, reduced for impairment losses. The preconstruction stage of the development or redevelopment of an operating property includes efforts and related costs to secure land control and zoning, evaluate feasibility and complete other initial tasks which are essential to development.

We capitalize interest expense, real estate taxes and direct and indirect project costs (including related compensation and other indirect costs) associated with properties, or portions thereof, undergoing construction, development and redevelopment activities. In capitalizing interest expense, if there is a specific borrowing for the property undergoing construction, development and redevelopment activities, we apply the interest rate of that borrowing to the average accumulated expenditures that do not exceed such borrowing; for the portion of expenditures exceeding any such specific borrowing, we apply our weighted average interest rate on other borrowings to the expenditures. We continue to capitalize costs while construction, development or redevelopment activities are underway until a property becomes “operational,” which occurs when lease terms commence (generally when the tenant has control of the leased space and we have delivered the premises to the tenant as required under the terms of such lease), but no later than one year after the cessation of major construction activities. When leases commence on portions of a newly-constructed or redeveloped property in the period prior to one year from the cessation of major construction activities, we consider that property to be “partially operational.” When a property is partially operational, we allocate the costs associated with the property between the portion that is operational and the portion under construction. We start depreciating newly-constructed and redeveloped properties as they become operational.

Most of our leases involve some form of improvements to leased space. When we are required to provide improvements under the terms of a lease, we determine whether the improvements constitute landlord assets or tenant assets. If the improvements are landlord assets, we capitalize the cost of the improvements and recognize depreciation expense associated with such improvements over the shorter of the useful life of the assets or the term of the lease and recognize any payments from the tenant as rental revenue over the term of the lease. If the improvements are tenant assets, we defer the cost of improvements funded by us as a lease incentive asset and amortize it as a reduction of rental revenue over the term of the lease. In determining whether improvements constitute landlord or tenant assets, we consider numerous factors, including: whether the improvements are unique to the tenant or reusable by other tenants; whether the tenant is permitted to alter or remove the improvements without our consent or without compensating us for any lost fair value; whether the ownership of the improvements remains with us or remains with the tenant at the end of the lease term; and whether the economic substance of the lease terms is properly reflected.

We depreciate our fixed assets using the straight-line method over their estimated useful lives as follows:

	Estimated Useful Lives
Buildings and building improvements	10-40 years
Land improvements	10-20 years
Tenant improvements on operating properties	Related lease term
Equipment and personal property	3-10 years

We assess each of our operating properties for impairment quarterly using cash flow projections and estimated fair values that we derive for each of the properties.  We update the leasing and other assumptions used in these projections regularly, paying particular attention to properties that have experienced chronic vacancy or face significant market challenges.  We review our plans and intentions for our development projects and land parcels quarterly.  If our analyses indicate that the carrying values of operating properties, properties in development or land held for future development may be impaired, we perform a recovery analysis for such properties.  For long-lived assets to be held and used, we analyze recoverability based on the estimated undiscounted future cash flows expected to be generated from the operations and eventual disposition of the assets over, in most cases, a ten-year holding period.  If we believe there is a significant possibility that we might dispose of the assets earlier, we analyze recoverability using a probability weighted analysis of the estimated undiscounted future cash flows expected to be generated from the operations and eventual disposition of the assets over the various possible holding periods.  If the recovery analysis indicates that the carrying value of a tested property is not recoverable from estimated future cash flows, it is written down to its estimated fair value and an impairment loss is recognized.  If and when our plans change, we revise our recoverability analyses to use the cash flows expected from the operations and eventual disposition of each asset using holding periods that are consistent with our revised plans. Changes in holding periods may require us to recognize significant impairment losses. 

Fair values are estimated based on contract prices, indicative bids, discounted cash flow analyses, yield analyses or sales comparison approach. Estimated cash flows used in such analyses are based on our plans for the property and our views of market and economic conditions. The estimates consider factors such as current and future rental rates, occupancies for the tested property and comparable properties, estimated operating and capital expenditures and recent sales data for comparable properties; most of these factors are influenced by market data obtained from real estate leasing and brokerage firms and our direct experience with the properties and their markets.

When we determine that a property is held for sale, we stop depreciating the property and estimate the property’s fair value, net of selling costs; if we then determine that the estimated fair value, net of selling costs, is less than the net book value of the property, we recognize an impairment loss equal to the difference and reduce the net book value of the property. For periods in which a property is classified as held for sale, we classify the assets of the property as held for sale on our consolidated balance sheet for such periods.

For dispositions of operating properties occurring prior to June 30, 2014 in which we had no significant continuing involvement, or for operating properties held for sale prior to June 30, 2014, we classify the results of operations for such properties as discontinued operations; interest expense that is specifically identifiable to properties included in discontinued operations is used in the computation of interest expense attributable to discontinued operations. We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) related to the reporting of discontinued operations and disclosures of disposals of components of an entity effective for the quarterly period ended June 30, 2014. This guidance defines a discontinued operation as a component or group of components disposed or classified as held for sale that represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results; the guidance states that a strategic shift could include a disposal of a major geographical area of operations, a major line of business, a major equity method investment or other major parts of an entity. We have had no properties newly classified as discontinued operations subsequent to our adoption of this guidance.

Sales of Interests in Real Estate

We recognize gains from sales of interests in real estate using the full accrual method, provided that various criteria relating to the terms of sale and any subsequent involvement by us with the real estate sold are met.

Cash and Cash Equivalents

Cash and cash equivalents include all cash and liquid investments that mature three months or less from when they are purchased. Cash equivalents are reported at cost, which approximates fair value. We maintain our cash in bank accounts in amounts that may exceed Federally insured limits at times. We have not experienced any losses in these accounts in the past and believe that we are not exposed to significant credit risk because our accounts are deposited with major financial institutions.

Investments in Marketable Securities

We classify marketable securities as trading securities when we have the intent to sell such securities in the near term, and classify other marketable securities as available-for-sale securities. We determine the appropriate classification of investments in marketable securities at the acquisition date and re-evaluate the classification at each balance sheet date. We report investments in marketable securities classified as trading securities at fair value, with unrealized gains and losses recognized through earnings; on our consolidated statements of cash flows, we classify cash flows from these securities as operating activities.

Accounts and Deferred Rents Receivable and Investing Receivables

We maintain allowances for estimated losses resulting from the failure of our customers or borrowers to satisfy their payment obligations. We use judgment in estimating these allowances based primarily upon the payment history and credit status of the entities associated with the individual receivables. We write off these receivables when we believe the facts and circumstances indicate that continued pursuit of collection is no longer warranted. When cash is received in connection with receivables for which we have established allowances, we reduce the amount of losses previously recognized.

We evaluate the collectibility of both interest and principal of loans whenever events or changes in circumstances indicate such amounts may not be recoverable. A loan is impaired when it is probable that we will be unable to collect all amounts due according to the existing contractual terms.  When a loan is impaired, the amount of the loss accrual is calculated by comparing the carrying amount of the investment to the present value of expected future cash flows discounted at the loan’s effective interest rate and the value of any collateral under such loan.

Interest on impaired loans is recognized when received in cash.

Deferred Leasing and Financing Costs

We defer costs incurred to obtain new tenant leases or extend existing tenant leases, including related compensation costs. We amortize these costs evenly over the lease terms. When tenant leases are terminated early, we expense any unamortized deferred leasing costs associated with those leases over the shortened term of the lease.

We defer costs of financing arrangements and recognize these costs as interest expense over the related loan terms on a straight-line basis, which approximates the amortization that would occur under the effective interest method of amortization. We expense any unamortized loan costs when loans are retired early.

In April 2015, the FASB issued guidance that changes the presentation of deferred debt issuance costs in financial statements. This guidance requires an entity to present such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset. This guidance was further updated in August 2015 with respect to debt issuance costs of line-of-credit arrangements to note that it will be permissible for an entity to defer and present debt issuance costs as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of a line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. We adopted this guidance effective for the quarterly period ended December 31, 2015 retrospectively to each prior period presented. The application of this guidance changed the balance sheet classification of most of our deferred financing costs but did not otherwise affect our consolidated financial statements. For costs of such arrangements attributable to line-of-credit arrangements and interest rate derivatives, we present such costs in the balance sheet in the line entitled prepaid and other assets.

Noncontrolling Interests

COPT’s consolidated noncontrolling interests are comprised of interests in COPLP not owned by COPT (discussed further in Note 14) and consolidated real estate joint ventures (discussed further in Note 6). COPLP’s consolidated noncontrolling interests are comprised primarily of interests in our consolidated real estate joint ventures. Also included in COPLP’s consolidated noncontrolling interests are interests in several real estate entities owned directly by COPT, or a wholly owned subsidiary of COPT, that generally do not exceed 1% of interests in such entities. We evaluate whether noncontrolling interests are subject to redemption features outside of our control. For noncontrolling interests that are currently redeemable for cash at the option of the holders of such interests or deemed probable to eventually become redeemable, we classify such interests as redeemable noncontrolling interests in the mezzanine section of our consolidated balance sheets; we adjust these interests each period to the greater of their fair value or carrying amount (initial amount as adjusted for allocations of income and losses and contributions and distributions), with a corresponding offset to additional paid-in capital on COPT’s consolidated balance sheets or common units on COPLP’s balance sheet, and only recognize reductions in such interests to the extent of their carrying amount. Our other noncontrolling interests are reported in the equity section of our consolidated balance sheets. The amounts reported for noncontrolling interests on our consolidated statements of operations represent the portion of these entities’ income or losses not attributable to us.

Revenue Recognition

We recognize minimum rents, net of abatements, on a straight-line basis over the term of tenant leases. A lease term generally commences when: (1) the tenant has control of the leased space (legal right to use the property); and (2) we have delivered the premises to the tenant as required under the terms of such lease. The term of a lease generally includes periods when a tenant: (1) may not terminate its lease obligation early; (2) may terminate its lease obligation early in exchange for a fee or penalty that we consider material enough such that termination would not be probable; (3) possesses renewal rights and the tenant’s failure to exercise such rights imposes a penalty on the tenant material enough such that renewal appears reasonably assured; or (4) possesses bargain renewal options for such periods. We report the amount by which our minimum rental revenue recognized on a straight-line basis under leases exceeds the contractual rent billings associated with such leases as deferred rent receivable on our consolidated balance sheets. Amounts by which our minimum rental revenue recognized on a straight-line basis under leases are less than the contractual rent billings associated with such leases are included in deferred revenue associated with operating leases on our consolidated balance sheets.

In connection with a tenant’s entry into, or modification of, a lease, if we make cash payments to, or on behalf of, the tenant for purposes other than funding the construction of landlord assets, we defer the amount of such payments as lease incentives. As discussed above, when we are required to provide improvements under the terms of a lease, we determine whether the improvements constitute landlord assets or tenant assets; if the improvements are tenant assets, we defer the cost of improvements funded by us as a lease incentive asset. We amortize lease incentives as a reduction of rental revenue over the term of the lease.

We recognize tenant recovery revenue in the same periods in which we incur the related expenses. Tenant recovery revenue includes payments from tenants as reimbursement for property taxes, utilities and other property operating expenses.

We recognize fees received for lease terminations as revenue and write off against such revenue any (1) deferred rents receivable, and (2) deferred revenue, lease incentives and intangible assets that are amortizable into rental revenue associated with the leases; the resulting net amount is the net revenue from the early termination of the leases. When a tenant's lease for space in a property is terminated early but the tenant continues to lease such space under a new or modified lease in the property, the net revenue from the early termination of the lease is recognized evenly over the remaining life of the new or modified lease in place on that property.

We recognize fees for services provided by us once services are rendered, fees are determinable and collectability is assured. We recognize revenue under construction contracts using the percentage of completion method when the revenue and costs for such contracts can be estimated with reasonable accuracy; when these criteria do not apply to a contract, we recognize revenue on that contract using the completed contract method. Under the percentage of completion method, we recognize a percentage of the total estimated revenue on a contract based on the cost of services provided on the contract as of a point in time relative to the total estimated costs on the contract.

Interest Rate Derivatives

Our primary objectives in using interest rate derivatives are to add stability to interest expense and to manage exposure to interest rate movements. To accomplish this objective, we primarily use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for our making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.  Derivatives are used to hedge the cash flows associated with interest rates on existing debt as well as future debt. We recognize all derivatives as assets or liabilities on our consolidated balance sheet at fair value. We defer the effective portion of changes in fair value of the designated cash flow hedges to AOCI and reclassify such deferrals to interest expense as interest expense is recognized on the hedged forecasted transactions. We recognize the ineffective portion of the change in fair value of interest rate derivatives directly in interest expense. When an interest rate swap designated as a cash flow hedge no longer qualifies for hedge accounting, we recognize changes in fair value of the hedge previously deferred to AOCI, along with any changes in fair value occurring thereafter, through earnings. We do not use interest rate derivatives for trading or speculative purposes. We manage counter-party risk by only entering into contracts with major financial institutions based upon their credit ratings and other risk factors.

We use standard market conventions and techniques such as discounted cash flow analysis, option pricing models, replacement cost and termination cost in computing the fair value of derivatives at each balance sheet date. We made an accounting policy election to use an exception provided for in the applicable accounting guidance with respect to measuring counterparty credit risk for derivative instruments; this election enables us to measure the fair value of groups of assets and liabilities associated with derivative instruments consistently with how market participants would price the net risk exposure as of the measurement date.

Please refer to Note 11 for additional information pertaining to interest rate derivatives.

Expense Classification

We classify as property operations expense costs incurred for property taxes, ground rents, utilities, property management, insurance, repairs, exterior and interior maintenance and tenant revenue collection losses, as well as associated labor and indirect costs attributable to these costs.

We classify as general and administrative and leasing expenses costs incurred for corporate-level management, public company administration, asset management, leasing, investor relations, marketing and corporate-level insurance (including general business, director and officers and key man life) and leasing prospects, as well as associated labor and indirect costs attributable to these costs.

Share-Based Compensation

We issue three forms of share-based compensation: restricted COPT common shares (“restricted shares”), deferred share awards and performance share units (“PSUs”). We also issued options to purchase COPT common shares (“options”) in prior years. We account for share-based compensation in accordance with authoritative guidance provided by the FASB that establishes standards for the accounting for transactions in which an entity exchanges its equity instruments for goods or services, focusing primarily on accounting for transactions in which an entity obtains employee services in share-based payment transactions. The guidance requires us to measure the cost of employee services received in exchange for an award of equity instruments based generally on the fair value of the award on the grant date; such cost is then recognized over the period during which the employee is required to provide service in exchange for the award. No compensation cost is recognized for equity instruments for which employees do not render the requisite service. The guidance also requires that share-based compensation be computed based on awards that are ultimately expected to vest; as a result, future forfeitures of awards are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. If an award is voluntarily cancelled by an employee, we recognize the previously unrecognized cost associated with the original award on the date of such cancellation. We capitalize costs associated with share-based compensation attributable to employees engaged in construction and development activities.

When we adopted the authoritative guidance on accounting for share-based compensation, we elected to adopt the alternative transition method for calculating the tax effects of share-based compensation. This method enabled us to use a simplified method to establishing the beginning balance of the additional paid-in capital pool related to the tax effects of employee share-based compensation that was available to absorb tax deficiencies recognized subsequent to the adoption of this guidance.

We compute the fair value of restricted shares and deferred share awards based on the fair value of COPT common shares on the grant date.

We compute the fair value of options using the Black-Scholes option-pricing model. Under that model, the risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected option life is based on our historical experience of employee exercise behavior. Expected volatility is based on historical volatility of COPT common shares. Expected dividend yield is based on the average historical dividend yield on our common shares over a period of time ending on the grant date of the options.

We compute the fair value of PSUs using a Monte Carlo model. Under that model, the baseline common share value is based on the market value on the grant date. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. Expected volatility is based on historical volatility of COPT’s common shares.

Income Taxes

COPT elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code. To qualify as a REIT, COPT must meet a number of organizational and operational requirements, including a requirement that it distribute at least 90% of the Company’s adjusted taxable income to its shareholders. As a REIT, COPT generally will not be subject to Federal income tax on taxable income that it distributes to its shareholders. If COPT fails to qualify as a REIT in any tax year, it will be subject to Federal income tax on its taxable income at regular corporate rates and may not be able to qualify as a REIT for four subsequent tax years.

COPLP is a limited partnership and is not subject to federal income tax. Its partners are required to report their respective share of the Operating Partnership’s taxable income on their respective tax returns. COPT’s share of the Operating Partnership’s taxable income is reported on COPT’s income tax return.

For Federal income tax purposes, dividends to shareholders may be characterized as ordinary income, capital gains or return of capital. The characterization of dividends paid on COPT’s common and preferred shares during each of the last three years was as follows:

	Common Shares						Preferred Shares
	For the Years Ended December 31,						For the Years Ended December 31,
	2015		2014		2013		2015		2014		2013
Ordinary income	38.3	%	64.5	%	71.8	%	38.3	%	90.9	%	76.2	%
Long-term capital gain	61.7	%	6.5	%	22.4	%	61.7	%	9.1	%	23.8	%
Return of capital	0.0	%	29.0	%	5.8	%	0.0	%	0.0	%	0.0	%

In addition, dividends paid on January 15, 2016 (with a record date of December 31, 2015) on COPT’s common and preferred shares were allocated to 2015 for Federal income tax purposes and characterized based on the percentages set forth above for 2015.

We distributed all of COPT’s REIT taxable income in 2015, 2014 and 2013 and, as a result, did not incur Federal income tax in those years.

The net basis of our consolidated assets and liabilities for tax reporting purposes was approximately $224 million lower than the amount reported on our consolidated balance sheet at December 31, 2015, which was primarily related to differences in basis for net properties, intangible assets on property acquisitions and deferred rent receivable.

We are subject to certain state and local income and franchise taxes. The expense associated with these state and local taxes is included in general and administrative expense and property operating expenses on our consolidated statements of operations. We did not separately state these amounts on our consolidated statements of operations because they are insignificant.

Recent Accounting Pronouncements

In May 2014, the FASB issued guidance regarding the recognition of revenue from contracts with customers. Under this guidance, an entity will recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additionally, this guidance requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We are required to adopt this guidance for our annual and interim periods beginning January 1, 2018 using one of two methods: retrospective restatement for each reporting period presented at the time of adoption, or retrospectively with the cumulative effect of initially applying this guidance recognized at the date of initial application. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In January 2015, the FASB issued guidance regarding the presentation of extraordinary and unusual items in statements of operations. This guidance eliminates the concept of extraordinary items. However, the presentation and disclosure requirements for items that are either unusual in nature or infrequent in occurrence remain and will be expanded to include items that are both unusual in nature and infrequent in occurrence. This guidance is effective for periods beginning after December 15, 2015. We expect that the application of this guidance will have no effect on our reported consolidated financial statements.

In February 2015, the FASB issued guidance regarding amendments to the consolidation analysis. This guidance amends the criteria for determining which entities are considered variable interest entities (“VIE”), amends the criteria for determining if a service provider possesses a variable interest in a VIE and ends the deferral granted to investment companies for application of the VIE consolidation model. This guidance is effective for annual periods, and interim periods therein, beginning after December 15, 2015. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

As discussed further above, we adopted guidance issued by the FASB effective for the quarterly period ended December 31, 2015 retrospectively to each prior period presented that requires an entity to present deferred debt issuance costs (other than costs of line-of-credit arrangements) in the balance sheet as a direct deduction from the related debt liability rather than as an asset.

In September 2015, the FASB issued guidance that eliminates the requirement to restate prior period financial statements for measurement period adjustments following a business combination.  The guidance requires that the cumulative impact of a measurement period adjustment (including the impact on prior periods) be recognized in the reporting period in which the adjustment is identified. The prior period impact of the adjustment should be either presented separately on the face of the statement of operations or disclosed in the notes. This guidance is effective for annual reporting periods beginning after December 15, 2015.  This guidance will be applied prospectively for measurement period adjustments that occur after the effective date.  We expect that the application of this guidance will not materially affect our consolidated financial statements.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Accounting standards define fair value as the exit price, or the amount that would be received upon sale of an asset or paid to transfer a liability in an orderly transaction between market participants as of the measurement date. The standards also establish a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that the most observable inputs be used when available. Observable inputs are inputs market participants would use in valuing the asset or liability developed based on market data obtained from sources independent of us. Unobservable inputs are inputs that reflect our assumptions about the factors market participants would use in valuing the asset or liability developed based upon the best information available in the circumstances. The hierarchy of these inputs is broken down into three levels: Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities; Level 2 inputs include (1) quoted prices for similar assets or liabilities in active markets, (2) quoted prices for identical or similar assets or liabilities in inactive markets and (3) inputs (other than quoted prices) that are observable for the asset or liability, either directly or indirectly; and Level 3 inputs are unobservable inputs for the asset or liability. Categorization within the valuation hierarchy is based upon the lowest level of input that is most significant to the fair value measurement.

Recurring Fair Value Measurements

COPT has a non-qualified elective deferred compensation plan for certain members of our management team that permits participants to defer up to 100% of their compensation on a pre-tax basis and receive a tax-deferred return on such deferrals. The assets held in the plan (comprised primarily of mutual funds and equity securities) and the corresponding liability to the participants are measured at fair value on a recurring basis on COPT’s consolidated balance sheet using quoted market prices, as are other marketable securities that we hold. The balance of the plan, which was fully funded, totaled $5.8 million as of December 31, 2015 and $5.9 million as of December 31, 2014, and is included in the accompanying COPT consolidated balance sheets in the line entitled restricted cash and marketable securities. The offsetting liability associated with the plan is adjusted to fair value at the end of each accounting period based on the fair value of the plan assets and reported in other liabilities on COPT’s consolidated balance sheets. The assets of the plan and other marketable securities that we hold are classified in Level 1 of the fair value hierarchy. The liability associated with the plan is classified in Level 2 of the fair value hierarchy.

The fair values of our interest rate derivatives are determined using widely accepted valuation techniques, including a discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate market data and implied volatilities in such interest rates. While we determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our interest rate derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default. However, as of December 31, 2015, we assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivatives and determined that these adjustments are not significant. As a result, we determined that our interest rate derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy.

As discussed further in Note 6, our partners in two real estate joint ventures, LW Redstone Company, LLC and Stevens Investors, LLC, have the right to require us to acquire their respective interests at fair value; accordingly, we classify the fair value of our partners’ interests as redeemable noncontrolling interests in the mezzanine section of our consolidated balance sheet. We determine the fair value of the interests based on unobservable inputs after considering the assumptions that market participants would make in pricing the interest. We apply a discount rate to the estimated future cash flows allocable to our partners from the properties underlying the respective joint ventures. Estimated cash flows used in such analyses are based on our plans for the properties and our views of market and economic conditions, and consider items such as current and future rental rates, occupancies for the properties and comparable properties and estimated operating and capital expenditures.

The carrying values of cash and cash equivalents, restricted cash, accounts receivable, other assets (excluding investing receivables) and accounts payable and accrued expenses are reasonable estimates of their fair values because of the short maturities of these instruments.  As discussed in Note 8, we estimated the fair values of our investing receivables based on the discounted estimated future cash flows of the loans (categorized within Level 3 of the fair value hierarchy); the discount rates used approximate current market rates for loans with similar maturities and credit quality, and the estimated cash payments include scheduled principal and interest payments.  For our disclosure of debt fair values in Note 10, we estimated the fair value of our unsecured senior notes and exchangeable senior notes based on quoted market rates for publicly-traded debt (categorized within Level 2 of the fair value hierarchy) and estimated the fair value of our other debt based on the discounted estimated future cash payments to be made on such debt (categorized within Level 3 of the fair value hierarchy); the discount rates used approximate current market rates for loans, or groups of loans, with similar maturities and credit quality, and the estimated future payments include scheduled principal and interest payments.  Fair value estimates are made at a specific point in time, are subjective in nature and involve uncertainties and matters of significant judgment.  Settlement at such fair value amounts may not be possible and may not be a prudent management decision.

For additional fair value information, please refer to Note 8 for investing receivables, Note 10 for debt and Note 11 for interest rate derivatives.

COPT and Subsidiaries

The tables below set forth financial assets and liabilities of COPT and its subsidiaries that are accounted for at fair value on a recurring basis as of December 31, 2015 and 2014 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):

Description	Quoted Prices in Active Markets for Identical Assets(Level 1)		Significant Other Observable Inputs(Level 2)		Significant Unobservable Inputs(Level 3)		Total
December 31, 2015:
Assets:
Marketable securities in deferred compensation plan (1)
Mutual funds	$	5,658	$	—	$	—	$	5,658
Other	105		—		—		105
Interest rate derivatives (2)	—		53		—		53
Total assets	$	5,763	$	53	$	—	$	5,816
Liabilities:
Deferred compensation plan liability (3)	$	—	$	5,763	$	—	$	5,763
Interest rate derivatives	—		3,160		—		3,160
Total liabilities	$	—	$	8,923	$	—	$	8,923
December 31, 2014:
Assets:
Marketable securities in deferred compensation plan (1)
Mutual funds	$	5,756	$	—	$	—	$	5,756
Other	126		—		—		126
Interest rate derivatives (2)	—		274		—		274
Total assets	$	5,882	$	274	$	—	$	6,156
Liabilities:
Deferred compensation plan liability (3)	$	—	$	5,882	$	—	$	5,882
Interest rate derivatives	—		1,855		—		1,855
Total liabilities	$	—	$	7,737	$	—	$	7,737

(1) Included in the line entitled “restricted cash and marketable securities” on COPT’s consolidated balance sheet.

(2) Included in the line entitled “prepaid expenses and other assets” on COPT’s consolidated balance sheet.

(3) Included in the line entitled “other liabilities” on COPT’s consolidated balance sheet.

COPLP and Subsidiaries

The tables below set forth financial assets and liabilities of COPLP and its subsidiaries that are accounted for at fair value on a recurring basis as of December 31, 2015 and 2014 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):

Description	Quoted Prices in Active Markets for Identical Assets(Level 1)		Significant Other Observable Inputs(Level 2)		Significant Unobservable Inputs(Level 3)		Total
December 31, 2015:
Assets:
Interest rate derivatives (1)	$	—	$	53	$	—	$	53
Total Assets	$	—	$	53	$	—	$	53
Liabilities:
Interest rate derivatives	$	—	$	3,160	$	—	$	3,160
December 31, 2014:
Assets:
Interest rate derivatives (1)	$	—	$	274	$	—	$	274
Total Assets	$	—	$	274	$	—	$	274
Liabilities:
Interest rate derivatives	$	—	$	1,855	$	—	$	1,855

(1) Included in the line entitled “prepaid expenses and other assets” on COPLP’s consolidated balance sheet.

Nonrecurring Fair Value Measurements

In 2015, we recognized the following impairment losses resulting from nonrecurring fair value measurements:

• $12.8 million on land in Colorado Springs, Colorado (“Colorado Springs”). We classified some of this land as held for sale in the fourth quarter of 2015, at which time we adjusted the land to its estimated fair value less costs to sell. Due to the impairment loss on the land held for sale, we updated our estimates of fair value for other land owned in Colorado Springs and determined that the carrying value of some of this land exceeded such land’s estimated fair value, which resulted in recognition of an additional impairment loss;

• $6.6 million on land in Aberdeen, Maryland. After concluding during the fourth quarter that we no longer expected to develop operating properties on the land, we determined that the carrying amount of the land would not likely be recovered from the sale of this property over the likely remaining holding period. Accordingly, we adjusted the land to its estimated fair value;

• $2.6 million on operating properties in White Marsh, Maryland (included in our Regional Office segment) that we decided to sell and whose carrying amounts exceeded their estimated fair values less costs to sell. These properties were reclassified as held for sale during the year; and

• $1.3 million on an operating property in Northern Virginia (included in our Regional Office segment) that we sold on July 27, 2015 following receipt of an unsolicited offer. This property’s carrying value exceeded its fair value less costs to sell.

The table below sets forth the fair value hierarchy of the valuation technique we used to determine nonrecurring fair measurements of assets as of December 31, 2015 (dollars in thousands):

	Fair Values as of December 31, 2015
	Quoted Prices in				Significant
	Active Markets for		Significant Other		Unobservable
	Identical Assets		Observable Inputs		Inputs
Description	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Total properties, net (1)	$	—	$	—	$	13,850	$	13,850
Assets held for sale, net (2)	—		—		21,423		21,423

(1) Represents estimated fair values.

(2) Represents estimated fair values less costs to sell.

The table below sets forth quantitative information about significant unobservable inputs used for the Level 3 fair value measurements reported above as of December 31, 2015 (dollars in thousands):

Valuation Technique	Fair Values on  Measurement Date		Unobservable Input	Range (Weighted Average) (1)
Bids for property indicative of value	$	24,423	Indicative bids	N/A
Comparable sales analysis	10,850		Comparable sales prices	N/A

(1) Only one value applied for these unobservable inputs.

In 2014, we recognized impairment losses totaling $1.4 million primarily in connection with certain of our operating properties in White Marsh, Maryland (included in our Regional Office segment) that we decided to sell and whose carrying amounts exceeded the cash flows from the operations and sales of the properties over the shortened period. These properties were subsequently disposed during the year.

In 2013, we recognized the following impairment losses:

• for certain of our operating properties that served as collateral for a nonrecourse loan, we expected that the cash flows to be generated by the properties would be insufficient to fund debt service requirements on the loan. While we sought to negotiate various alternatives with the lender, on December 23, 2013, we conveyed the properties to the lender to extinguish the loan. We recognized non-cash impairment losses of $11.0 million (all classified as discontinued operations and including $560,000 in exit costs) on these properties in 2013 resulting primarily from the carrying amount of certain of these properties located in Colorado Springs (included in our Regional Office and Colorado Defense/IT Locations segments) exceeding their fair value;

• $15.2 million (all classified as discontinued operations and including $419,000 in exit costs) in connection with properties and land no longer aligned with our strategy that we sold, mostly in Colorado Springs (operating properties included primarily in our Regional Office and Colorado Defense/IT Locations segments); and

• $5.9 million on two properties in White Marsh, Maryland (included in our Regional Office segment) that we concluded no longer met our investment criteria during the year and whose carrying amounts exceeded the cash flows from the operations and sales of the properties over the shortened period.

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Concentration of Revenue

12 Months Ended

Dec. 31, 2015

Risks and Uncertainties [Abstract]

Concentration of Revenue

Concentration of Revenue

A large concentration of our revenue from real estate operations was earned from our largest tenant, the United States Government, including 20% of our rental revenue in 2015, 18% in 2014 and 18% in 2013 (continuing and discontinued operations, and excluding tenant recoveries and other real estate operations revenue). Our rental revenue from the United States Government was earned primarily from properties in the Fort Meade/Baltimore Washington Corridor, Lackland Air Force Base, Navy Support Locations and Redstone Arsenal business subsegments (see Note 17). No other individual tenants accounted for 10% or more of our revenue from real estate operations. In addition, we also derived in excess of 90% of our construction contract revenue from the United States Government in each of the years set forth on the consolidated statements of operations.

In addition, we derived large concentrations of our revenue from real estate operations from certain business segments as set forth in Note 17.

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Properties, net

12 Months Ended

Dec. 31, 2015

Real Estate [Abstract]

Properties, net

Properties, net

Operating properties, net consisted of the following (in thousands): 

	December 31,
	2015			2014
Land	$	463,305		$	439,355
Buildings and improvements	3,157,587			3,015,216
Less: accumulated depreciation	(700,363		)	(703,083		)
Operating properties, net	$	2,920,529		$	2,751,488

In 2014, we recognized $12.9 million in additional depreciation expense resulting from our shortening of the useful life of a property in Greater Philadelphia, Pennsylvania (included in our Regional Office segment) that was removed from service for redevelopment.

Projects we had in development or held for future development consisted of the following (in thousands): 

	December 31,
	2015		2014
Land	$	207,774	$	214,977
Development in progress, excluding land	221,445		330,449
Projects in development or held for future development	$	429,219	$	545,426

As of December 31, 2015, we had 13 operating properties in White Marsh, Maryland (included in our Regional Office segment), two operating properties in San Antonio (included in our Other segment) and land in Northern Virginia and Colorado Springs classified as held for sale. The table below sets forth the components of assets held for sale on our consolidated balance sheet for these properties (in thousands):

	December 31, 2015
Properties, net	$	90,188
Deferred rent receivable	2,891
Intangible assets on real estate acquisitions, net	1,591
Deferred leasing costs, net	1,391
Lease incentives, net	721
Assets held for sale, net	$	96,782

As of December 31, 2014, we had two land parcels in White Marsh, Maryland classified as held for sale with aggregate carrying amounts of $14.3 million that were sold in 2015.

2015 Acquisitions

In 2015, we acquired the following operating properties:

• 250 W. Pratt Street, a 367,000 square foot office property in Baltimore, Maryland that was 96.2% leased, for $61.8 million on March 19, 2015;

• 2600 Park Tower Drive, a 237,000 square foot office property in Vienna, Virginia that was 100% leased, for $80.5 million on April 15, 2015; and

• 100 Light Street, a 558,000 square foot office property in Baltimore, Maryland that was 93.5% leased, and its structured parking garage, 30 Light Street, for $121.2 million on August 7, 2015. In connection with that acquisition, we assumed a $55.0 million mortgage loan with a fair value at assumption of $55.5 million.

The table below sets forth the allocation of the aggregate purchase price of these properties to the value of the acquired assets and liabilities (in thousands):

Land, operating properties	$	55,076
Building and improvements	139,540
Intangible assets on real estate acquisitions	75,729
Total assets	270,345
Below-market leases	(6,808		)
Total acquisition cost	$	263,537

Intangible assets recorded in connection with these acquisitions included the following (dollars in thousands):

			Weighted Average Amortization Period (in Years)
Tenant relationship value	$	31,183	12
In-place lease value	35,139		7
Above-market leases	6,720		4
Below-market cost arrangements	2,687		40
	$	75,729	10

These properties contributed revenues of $20.2 million and net income from continuing operations of $1.2 million in 2015. We expensed operating property acquisition costs of $4.1 million in 2015 that are included in business development expenses and land carry costs on our consolidated statements of operations.

We accounted for these acquisitions as business combinations. We included the results of operations for the acquisitions in our consolidated statements of operations from their respective purchase dates through December 31, 2015. The following table presents pro forma information for COPT and subsidiaries as if these acquisitions had occurred on January 1, 2014. This pro forma information also includes adjustments to reclassify the operating property acquisition costs disclosed above from the 2015 periods in which they were incurred to the year ended December 31, 2014. The pro forma financial information was prepared for comparative purposes only and is not necessarily indicative of what would have occurred had these acquisitions been made at that time or of results which may occur in the future (in thousands, except per shares amounts).

	For the Year Ended December 31,
	2015		2014
	(Unaudited)
Pro forma total revenues	$	641,982	$	623,013
Pro forma net income attributable to COPT common shareholders	$	167,079	$	20,796
Pro forma EPS:
Basic	$	1.77	$	0.23
Diluted	$	1.77	$	0.23

2015 Dispositions

In 2015, we completed dispositions of the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Disposition	Number of Buildings	Total Rentable Square Feet	Transaction Value (1)		Gain on Disposition
1550 Westbranch Drive	McLean, VA	Regional Office	7/27/2015	1	160,000	$	27,800	$	—
15000 and 15010 Conference Center Drive	Chantilly, VA	Northern VA Defense/IT	8/28/2015	2	665,000	167,335		—
13200 Woodland Park Road	Herndon, VA	Regional Office	10/27/2015	1	397,000	84,000		42,515
9900, 9910 and 9920 Franklin Square Drive	White Marsh, MD	Regional Office	11/9/2015	3	135,000	24,150		6,468
9690 Deereco Road and 375 W. Padonia Road	Timonium, MD	Regional Office	12/17/2015	2	240,000	44,500		15,050
				9	1,597,000	$	347,785	$	64,033

(1) Each of these properties were sold except for 15000 and 15010 Conference Center Drive, the disposition of which was completed in connection with a debt extinguishment, as discussed further below.

We also sold land in 2015 for $18.1 million and recognized gains of $4.0 million on the sales.

On August 28, 2015, ownership in 15000 and 15010 Conference Center Drive was transferred to the mortgage lender on a $150.0 million nonrecourse mortgage loan that was secured by the properties and we removed the debt obligation and accrued interest from our balance sheet. Upon completion of this transfer, we recognized a gain on early extinguishment of debt of $84.8 million, representing the difference between the mortgage loan and accrued interest payable extinguished over the carrying value of the properties transferred as of the transfer date and related closing costs.

2015 Construction Activities

In 2015, we placed into service an aggregate of 897,000 square feet in seven newly constructed office properties and 170,000 square feet in two redeveloped properties. As of December 31, 2015, we had nine office properties under construction, or for which we were contractually committed to construct, that we estimate will total 1.3 million square feet upon completion and four office properties under redevelopment that we estimate will total 156,000 square feet upon completion.

2014 Dispositions

In 2014, we completed dispositions of the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Sale	Number of Buildings	Total Rentable Square Feet	Transaction Value		Gain on Disposition
4969 and 4979 Mercantile Road	White Marsh, MD	Regional Office	7/14/2014	2	96,721	$	5,960	$	2,124
9930 and 9940 Franklin Square	White Marsh, MD	Regional Office	7/30/2014	2	71,992	10,475		2,303
5020, 5022, 5024 and 5026 Campbell Boulevard	White Marsh, MD	Regional Office	8/4/2014	4	134,245	12,400		666
				8	302,958	$	28,835	$	5,093

We also sold land in 2014 for $28.3 million and recognized gains of $5.6 million on the sales.

2014 Construction Activities

In 2014, we placed into service an aggregate of 692,000 square feet in five newly constructed office properties.

2013 Dispositions

 In 2013, we completed dispositions of the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Sale	Number of Buildings	Total Rentable Square Feet	Transaction Value (1)		Gain on Disposition
920 Elkridge Landing Road	Linthicum, MD	Fort Meade/BW Corridor	6/25/2013	1	103,000	$	6,900	$	—
4230 Forbes Boulevard	Lanham, MD	Regional Office	12/11/2013	1	56,000	5,600		1,507
December 2013 Colorado Springs Portfolio Disposition	Colorado Springs, CO	Colorado Defense/IT and Regional Office	12/12/2013	15	1,165,000	133,925		1,164
December 2013 Portfolio Conveyance	Colorado Springs, CO and Linthicum, MD	Various (2)	12/23/2013	14	1,021,000	146,876		—
				31	2,345,000	$	293,301	$	2,671

(1) Each of these properties were sold except for the December 2013 Portfolio Conveyance, the disposition of which was completed in connection with a debt extinguishment, as described further below.

(2) Included properties in our Fort Meade/BW Corridor, Colorado Defense/IT and Regional Office segments.

We also disposed of a non-operating property in 2013 for an aggregate transaction value of $3.5 million. In addition to the gains on dispositions reflected above, we recognized impairment losses on certain of these assets that are disclosed in Note 3.

On December 23, 2013, the mortgage lender on a $146.5 million nonrecourse mortgage loan that was secured by the December 2013 Portfolio Conveyance accepted a deed in lieu of foreclosure on the properties. As a result, we transferred title to the properties to the mortgage lender and we were relieved of the debt obligation plus accrued interest. Upon completion of this transfer, we recognized a gain on extinguishment of debt of $67.8 million, representing the excess of the mortgage loan and interest payable extinguished over the carrying values of the properties transferred as of the transfer date (which included the effect of previous impairment losses) and related closing costs.

2013 Construction Activities

In 2013, we placed into service an aggregate of 812,000 square feet in eight newly constructed office properties.

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Real Estate Joint Ventures

12 Months Ended

Dec. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Real Estate Joint Ventures

Real Estate Joint Ventures

Consolidated Real Estate Joint Ventures

The table below sets forth information pertaining to our investments in consolidated real estate joint ventures as of December 31, 2015 (dollars in thousands):

		Nominal
		Ownership		December 31, 2015				(1)
	Date	% as of		Total		Encumbered		Total
	Acquired	12/31/2015	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	147,612	$	82,721	$	54,022
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	56,455		48,245		37,568
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	5,284		—		393
				$	209,351	$	130,966	$	91,983

(1) Excludes amounts eliminated in consolidation.

(2) This joint venture’s property is in Huntsville, Alabama.

(3) This joint venture’s properties are in College Park, Maryland.

(4) This joint venture’s property is in Washington, DC.

With regard to our consolidated joint ventures:

• For LW Redstone, LLC, we anticipate funding certain infrastructure costs (up to a maximum of $76.0 million excluding accrued interest thereon) due to be reimbursed by the City of Huntsville as discussed further in Note 8; as of December 31, 2015, we had advanced $37.2 million to the City to fund such costs (excluding accrued interest; the aggregate amount outstanding under these notes, including accrued interest, was $44.9 million as of December 31, 2015 and is included in investing receivables on our consolidated balance sheets).  We also expect to fund additional development and construction costs through equity contributions to the extent that third party financing is not obtained.  Our partner was credited with a $9.0 million capital account upon formation and is not required to make any future equity contributions. While net cash flow distributions to the partners vary depending on the source of the funds distributed, cash flows are generally distributed as follows:

• cumulative preferred returns on capital invested to fund the project’s infrastructure costs on a pro rata basis to us and our partner;

• cumulative preferred returns on our capital invested to fund the project’s vertical construction;

• return of our invested capital;

• return of our partner’s capital;

• any remaining residual 85% to us and 15% to our partner.

Our partner has the right to require us to acquire its interest for fair value beginning in March 2020; accordingly, we classify the fair value of our partner’s interest as redeemable noncontrolling interests in the mezzanine section of our consolidated balance sheet. We have the right to purchase our partner’s interest at fair value upon the earlier of five years following the project’s achievement of a construction commencement threshold of 4.4 million square feet or March 2040; the project had achieved 594,000 square feet of construction commencement through December 31, 2015;

• For M Square Associates, LLC, net cash flows of this entity will be distributed to the partners as follows: (1) member loans and accrued interest; (2) our preferred return and capital contributions used to fund infrastructure costs; (3) the partners’ preferred returns and capital contributions used to fund all other costs, including the base land value credit, in proportion to the accrued returns and capital accounts; and (4) residual amounts distributed 50% to each member.

• For Stevens Investors, LLC, net cash flows of this entity will be distributed to the partners as follows: (1) member loans and accrued interest; (2) pro rata return of the partners’ capital; (3) pro rata return of the partners’ respective unpaid preferred returns; and (4) varying splits of 85% to 60% to us and the balance to our partners as we reach specified return hurdles. Our partners have the right to require us to acquire some or all of their interests for fair value for a defined period of time following the construction completion and stabilization (as defined in the operating agreement) of the joint venture’s office property; accordingly, we classify the fair value of our partners’ interest as redeemable noncontrolling interests in the mezzanine section of our consolidated balance sheet. Our partners have the right to receive some or all of the consideration for the acquisition of their interests in the form of common units in COPLP.

We disclose the activity of our redeemable noncontrolling interests in Note 12.

The ventures discussed above include only ones in which parties other than COPLP and COPT own interests.

During the periods included herein, we also owned investments in the following consolidated real estate joint ventures:

• Arundel Preserve #5, LLC, a joint venture owning property in Hanover, Maryland (in the Baltimore/Washington Corridor) and in which we had a 50% nominal ownership interest. On September 17, 2013, we acquired our partner’s noncontrolling interest, along with incremental additional land value in the venture, in exchange for 221,501 common units in COPLP valued at $5.2 million;

• MOR Forbes 2 LLC, a joint venture owning property in Lanham, Maryland (in the Baltimore/Washington Corridor) and in which we had a 50% nominal ownership interest. On December 11, 2013, the joint venture sold the property, after which the proceeds were distributed to the partners and there was substantially no remaining business operations or property; and

• COPT-FD Indian Head, LLC, a joint venture owning property in Charles County, Maryland (in our “Other” region). On August 7, 2014, the joint venture’s property was repurchased by Charles County under the terms of a development agreement for $6.4 million, after which the proceeds were distributed to the partners and there was no remaining business operations or assets.

We consolidate the real estate joint ventures described above because we have: (1) the power to direct the matters that most significantly impact the activities of the joint ventures, including development, leasing and management of the properties constructed by the VIEs; and (2) the right to receive returns on our fundings and, in many cases, the obligation to fund the activities of the ventures to the extent that third-party financing is not obtained, both of which could be potentially significant to the VIEs.

Our commitments and contingencies pertaining to our real estate joint ventures are disclosed in Note 20.

Unconsolidated Real Estate Joint Venture

We had a 20% ownership interest in an unconsolidated real estate joint venture that operated 16 operating properties, and in which we had a negative investment balance of $6.4 million as of December 31, 2012. We accounted for the investment in the joint venture using the equity method of accounting. On December 6, 2013, the holder of mortgage debt encumbering all of the joint venture’s properties foreclosed on the properties. As a result, title to the properties was transferred to the mortgage lender and the joint venture was relieved of the debt obligation. We recognized a gain on the substantive disposition of our investment in the joint venture in 2013 of $6.3 million, which is included in the line entitled “gain on sales of real estate, net of income taxes” on our consolidated statements of operations.

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Intangible Assets on Real Estate Acquisitions

12 Months Ended

Dec. 31, 2015

Intangible Assets on Real Estate Acquisitions

Intangible Assets on Real Estate Acquisitions

Intangible Assets on Real Estate Acquisitions

Intangible assets on real estate acquisitions consisted of the following (in thousands):

	December 31, 2015						December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net  Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
In-place lease value	$	134,664	$	89,540	$	45,124	$	123,759	$	101,040	$	22,719
Tenant relationship value	62,172		23,468		38,704		42,301		28,492		13,809
Below-market cost arrangements	15,102		6,692		8,410		12,415		5,984		6,431
Above-market leases	14,210		8,491		5,719		8,659		8,159		500
Other	1,333		952		381		1,333		938		395
	$	227,481	$	129,143	$	98,338	$	188,467	$	144,613	$	43,854

Amortization of the intangible asset categories set forth above totaled $18.5 million in 2015, $15.2 million in 2014 and $16.2 million in 2013. The approximate weighted average amortization periods of the categories set forth above follow: in-place lease value: six years; tenant relationship value: 11 years; below-market cost arrangements: 35 years; above-market leases: four years; and other: 27 years. The approximate weighted average amortization period for all of the categories combined is eleven years. The estimated amortization (to amortization associated with real estate operations, rental revenue and property operating expenses) associated with the intangible asset categories set forth above for the next five years is: $18.8 million for 2016; $16.3 million for 2017; $11.6 million for 2018; $8.8 million for 2019; and $7.0 million for 2020.

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Investing Receivables

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Investing Receivables

Investing Receivables

Investing receivables, including accrued interest thereon, consisted of the following (in thousands):

	December 31,
	2015		2014
Notes receivable from City of Huntsville	$	44,875	$	49,147
Other investing loans receivable	3,000		3,000
	$	47,875	$	52,147

Our notes receivable from the City of Huntsville funded infrastructure costs in connection with our LW Redstone Company, LLC joint venture (see Note 6) and carry an interest rate of 9.95%. These notes and the accrued and unpaid interest thereon, which is compounded annually on March 1st, will be repaid using the real estate taxes generated by the properties constructed by the joint venture. When these tax revenues are sufficient to cover the debt service on a certain increment of municipal bonds, the City of Huntsville will be required to issue bonds to repay the notes receivable and the accrued and unpaid interest thereon. Each note has a maturity date of the earlier of 30 years from the date issued or the expiration of the tax increment district comprising the constructed properties in 2045.

We did not have an allowance for credit losses in connection with our investing receivables as of December 31, 2015 or December 31, 2014.  The fair value of these receivables approximated their carrying amounts as of December 31, 2015 and December 31, 2014.

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Prepaid Expenses and Other Assets, Net

12 Months Ended

Dec. 31, 2015

Prepaid Expense and Other Assets [Abstract]

Prepaid Expenses and Other Assets, Net

Prepaid Expenses and Other Assets, Net

Prepaid expenses and other assets, net consisted of the following (in thousands):

	December 31,
	2015		2014
Prepaid expenses	$	23,009	$	20,570
Lease incentives	11,133		13,344
Furniture, fixtures and equipment, net	6,004		6,637
Deferred financing costs, net (1)	5,867		4,849
Deferred tax asset, net	3,467		4,002
Construction contract costs incurred in excess of billings	3,261		6,656
Equity method investments	1,636		2,368
Other assets	5,647		2,875
Prepaid expenses and other assets, net	$	60,024	$	61,301

(1) Represents deferred costs, net of accumulated amortization, attributable to our Revolving Credit Facility and interest rate derivatives.

Deferred tax asset, net reported above includes the following tax effects of temporary differences and carry forwards of our TRS (in thousands):

	December 31,
	2015			2014
Operating loss carry forward	$	5,065		$	5,012
Share-based compensation	363			976
Accrued payroll	133			195
Property	(32		)	(119		)
Valuation allowance	(2,062		)	(2,062		)
Deferred tax asset, net	$	3,467		$	4,002

We recognize a valuation allowance on our deferred tax asset if we believe all or some portion of the asset may not be realized. An increase or decrease in the valuation allowance resulting from a change in circumstances that causes a change in our judgment about the realizability of our deferred tax asset is included in income. The deferred tax asset valuation allowance is due to a decrease in future projected operating income in our TRS resulting primarily from our dispositions of certain properties to which the TRS provided amenity services and our planned reduction in amenity services provided by the TRS at certain other properties. We believe it is more likely than not that the results of future operations in our TRS will generate sufficient taxable income to realize our December 31, 2015 net deferred tax asset.

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Debt

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Debt

Debt

Debt Summary

Our debt consisted of the following (dollars in thousands):

	Carrying Value (1) as of
	December 31, 2015		December 31, 2014		Stated Interest Rates as of	Scheduled Maturity as of
					December 31, 2015	December 31, 2015
Mortgage and Other Secured Loans:
Fixed rate mortgage loans (2)	$	281,208	$	385,769	3.96% - 7.87% (3)	2016-2024
Variable rate secured loans	49,792		36,698		LIBOR + 1.85% - 2.00% (4)	2016-2020
Total mortgage and other secured loans	331,000		422,467
Revolving Credit Facility (5)	43,500		83,000		LIBOR + 0.875% to 1.60%	May 2019
Term Loan Facilities (6)	515,902		517,846		LIBOR + 0.90% to 2.60% (7)	2019-2022
Unsecured Senior Notes (5)
3.600%, $350,000 aggregate principal	346,714		346,311		3.60% (8)	May 2023
5.250%, $250,000 aggregate principal	245,731		245,306		5.25% (9)	February 2024
3.700%, $300,000 aggregate principal	297,378		296,927		3.70% (10)	June 2021
5.000%, $300,000 aggregate principal	296,019		—		5.00% (10)	July 2025
Unsecured notes payable	1,508		1,607		0% (11)	2026
4.25% Exchangeable Senior Notes (12)	—		572		N/A	N/A
Total debt	$	2,077,752	$	1,914,036

(1) The carrying values of our loans other than the Revolving Credit Facility reflect net deferred financing costs of $8.0 million as of December 31, 2015 and $6.0 million as of December 31, 2014.

(2)   Several of the fixed rate mortgages carry interest rates that were above or below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates.  The carrying values of these loans reflect net unamortized premiums totaling $514,000 as of December 31, 2015 and $42,000 as of December 31, 2014.

(3) The weighted average interest rate on our fixed rate mortgage loans was 6.08% as of December 31, 2015.

(4)  The weighted average interest rate on our variable rate secured loans was 2.2% as of December 31, 2015.

(5) Refer to the paragraphs below for further disclosure.

(6)   As discussed below, an additional $150.0 million in borrowings is available to be drawn under a term loan entered into in the current year. In addition, we have the ability to borrow an additional $430.0 million in the aggregate under these term loan facilities, provided that there is no default under the facilities and subject to the approval of the lenders.

(7)  The weighted average interest rate on these loans was 1.92% as of December 31, 2015.

(8)   The carrying value of these notes reflects an unamortized discount totaling $2.2 million as of December 31, 2015 and $2.5 million as of December 31, 2014. The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%.

(9)   The carrying value of these notes reflects an unamortized discount totaling $3.8 million as of December 31, 2015 and $4.2 million as of December 31, 2014. The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%.

(10) Refer to the paragraphs below for further disclosure.

(11)  These notes carry interest rates that were below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates.  The carrying value of these notes reflects an unamortized discount totaling $554,000 as of December 31, 2015 and $654,000 as of December 31, 2014.

(12) On April 20, 2015, we redeemed the remaining $575,000 principal amount of these notes at 100% of their principal amount. The carrying value of these notes as of December 31, 2014 included an unamortized discount totaling $3,000.

All debt is owed by the Operating Partnership. While COPT is not directly obligated by any debt, it has guaranteed the Operating Partnership’s Revolving Credit Facility, Term Loan Facilities and Unsecured Senior Notes.

Certain of our debt instruments require that we comply with a number of restrictive financial covenants, including maximum leverage ratio, unencumbered leverage ratio, minimum net worth, minimum fixed charge coverage, minimum unencumbered interest coverage ratio, minimum debt service and maximum secured indebtedness ratio. In addition, the terms of some of COPLP’s debt may limit its ability to make certain types of payments and other distributions to COPT in the event of default or when such payments or distributions may prompt failure of debt covenants.  As of December 31, 2015, we were within the compliance requirements of these financial covenants.

Our debt matures on the following schedule (in thousands):

2016	$	208,109
2017	3,252
2018	3,400
2019	167,014		(1)
2020	315,252
Thereafter	1,400,203
Total	$	2,097,230	(2)

(1)    Includes $43.5 million in 2019 that may be extended to 2020 at our option, subject to certain conditions.

(2)     Represents scheduled principal amortization and maturities only and therefore excludes net discounts and deferred financing costs of $19.5 million.

We capitalized interest costs of $7.2 million in 2015, $6.1 million in 2014 and $8.8 million in 2013.

The following table sets forth information pertaining to the fair value of our debt (in thousands):

	December 31, 2015				December 31, 2014
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Fixed-rate debt
Unsecured Senior Notes	$	1,185,842	$	1,211,658	$	888,544	$	901,599
Other fixed-rate debt	282,716		291,991		387,948		356,377
Variable-rate debt	609,194		610,987		637,544		642,091
	$	2,077,752	$	2,114,636	$	1,914,036	$	1,900,067

Revolving Credit Facility

On May 6, 2015, we entered into a credit agreement with a group of lenders for which KeyBanc Capital Markets and J.P. Morgan Securities LLC acted as joint lead arrangers and joint book runners, KeyBank National Association acted as administrative agent and JPMorgan Chase Bank, N.A. acted as syndication agent (the “Consolidated Credit Agreement”) to amend, restate and consolidate the terms of our existing unsecured revolving credit facility (the “Revolving Credit Facility”) and one of our term loan facilities discussed below. The lenders’ aggregate commitment under the Revolving Credit Facility is $800.0 million, with the ability for us to increase the lenders’ aggregate commitment to $1.3 billion, provided that there is no default under the facility and subject to the approval of the lenders. Amounts available under the facility are computed based on 60% of our unencumbered asset value, as defined in the agreement.  The facility matures on May 6, 2019, with the ability for us to further extend such maturity by twosix-month periods at our option, provided that there is no default under the facility and we pay an extension fee of 0.075% of the total availability under the facility for each extension period. The interest rate on the facility is based on LIBOR (customarily the 30-day rate) plus 0.875% to 1.600%, as determined by the credit ratings assigned to COPLP by Standard & Poor’s Rating Services, Moody’s Investor Services, Inc. or Fitch Ratings Ltd. (collectively, the “Ratings Agencies”). The facility also carries a quarterly fee that is based on the lenders’ aggregate commitment under the facility multiplied by a per annum rate of 0.125% to 0.300%, as determined by the credit ratings assigned to COPLP by the Ratings Agencies. As of December 31, 2015, the maximum borrowing capacity under this facility totaled $800.0 million, of which $741.7 million was available.

Weighted average borrowings under our Revolving Credit Facility totaled $125.0 million in 2015 and $15.9 million in 2014. The weighted average interest rate on our Revolving Credit Facility was 1.40% in 2015 and 1.47% in 2014.

Term Loan Facilities

Effective February 14, 2012, we entered into an unsecured term loan agreement under which we borrowed $250.0 million. In connection with our entry into the Consolidated Credit Agreement on May 6, 2015 discussed above, we increased the loan amount to $300.0 million, with a right for us to borrow up to an additional $200.0 million during the term for an aggregate maximum loan of $500.0 million, subject to certain conditions. The term loan matures on May 6, 2020.  The variable interest rate on the loan is based on the LIBOR rate (customarily the 30-day rate) plus 0.90% to 1.85%, as determined by the credit ratings assigned to COPLP by the Ratings Agencies.

Effective August 3, 2012, we entered into an unsecured term loan agreement under which we borrowed $120.0 million, with the ability for us to borrow an additional $80.0 million, provided that there is no default under the loan and subject to the approval of the lenders.  The term loan matures on August 2, 2019.  The variable interest rate on the loan is based on the LIBOR rate (customarily the 30-day rate) plus 2.10% to 2.60%, as determined by our leverage levels.

Effective December 17, 2015, we entered into an unsecured term loan agreement with an initial commitment of $250.0 million, of which we borrowed $100.0 million. We have until September 2016 to draw the remaining initial commitment. We also have the ability to borrow $150.0 million above the initial commitment, provided that there is no default under the loan and subject to the approval of the lenders.  The term loan matures on December 17, 2022.  The variable interest rate on the loan is based on the LIBOR rate (customarily the 30-day rate) plus 1.40% to 2.35%, as determined by our leverage levels.

We also had an unsecured term loan agreement under which we borrowed $400.0 million in 2011. In 2013, we amended this term loan and repaid $150.0 million of the loan balance. We repaid the loan balance by an additional $100.0 million in 2014 and repaid the remaining balance in 2015.

Unsecured Senior Notes

We issued the following senior notes in 2014 and 2015:

• $300.0 million of 3.700% Senior Notes at an initial offering price of 99.739% of their face value on May 14, 2014, resulting in proceeds, after deducting underwriting discounts, but before other offering expenses, of $297.3 million. The carrying value of these notes reflects an unamortized discount totaling $2.1 million as of December 31, 2015 and $2.4 million as of December 31, 2014. The effective interest rate under the notes, including amortization of the issuance costs, was 3.85%; and

• $300.0 million of 5.000% Senior Notes at an initial offering price of 99.510% of their face value on June 29, 2015, resulting in proceeds, after deducting underwriting discounts, but before other offering expenses of $296.6 million. The carrying value of these notes reflects an unamortized discount totaling $3.3 million at December 31, 2015. The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

We may redeem our unsecured senior notes, in whole at any time or in part from time to time, at our option, at a redemption price equal to the greater of (1) the aggregate principal amount of the notes being redeemed or (2) the sum of the present values of the remaining scheduled payments of principal and interest thereon (not including any portion of such payments of interest accrued as of the date of redemption) discounted to its present value, on a semi-annual basis at an adjusted treasury rate plus a spread (30 basis points for the 3.600% Senior Notes, 40 basis points for the 5.250% Senior Notes, 25 basis points for the 3.700% Senior Notes and 45 basis points for the 5.000% Senior Notes), plus, in each case, accrued and unpaid interest thereon to the date of redemption. However, in each case, if this redemption occurs on or after three months prior to the maturity date, the redemption price will be equal to 100% of the principal amount of the notes being redeemed, plus accrued and unpaid interest thereon to, but not including, the applicable redemption date. These notes are unconditionally guaranteed by COPT.

Gains (Losses) on Early Extinguishment of Debt

Our gains (losses) on early extinguishment of debt in 2013, 2014 and 2015 included the following:

• a gain of $67.8 million on December 23, 2013 resulting from our transfer of title to properties to the lender on a $146.5 million nonrecourse mortgage loan and being relieved of the debt obligation plus accrued interest as discussed further in Note 5;

• a loss of $25.9 million in 2013 resulting from early repayment of $239.4 million principal amount of 4.25% Exchangeable Senior Notes;

• a loss of $9.1 million in December 2014, when we completed the defeasance of, and full satisfaction of our obligations with respect to, (1) $103.0 million principal amount of secured nonrecourse mortgage loan due to mature on November 6, 2015 and bearing an interest rate of 5.53% and (2) $108.5 million principal amount of secured nonrecourse mortgage loan due to mature on January 1, 2016 and bearing an interest rate of 5.56%, as well as costs related to the defeasance and satisfaction; and

• a gain of $84.8 million on August 28, 2015 pertaining to the removal of a $150.0 million nonrecourse mortgage loan from our balance sheet as discussed further in Note 5.

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Interest Rate Derivatives

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Interest Rate Derivatives

Interest Rate Derivatives

The following table sets forth the key terms and fair values of our interest rate swap derivatives (dollars in thousands):

								Fair Value at
Notional						Effective	Expiration	December 31,
Amount			Fixed Rate		Floating Rate Index	Date	Date	2015			2014
$	100,000		0.8055	%	One-Month LIBOR	9/2/2014	9/1/2016	$	(148	)	$	(317	)
100,000			0.8100	%	One-Month LIBOR	9/2/2014	9/1/2016	(151		)	(324		)
100,000			1.6730	%	One-Month LIBOR	9/1/2015	8/1/2019	(1,217		)	239
100,000			1.7300	%	One-Month LIBOR	9/1/2015	8/1/2019	(1,429		)	35
13,941		(1)	1.3900	%	One-Month LIBOR	10/13/2015	10/1/2020	53			—
100,000			1.9013	%	One-Month LIBOR	9/1/2016	12/1/2022	(138		)	—
100,000			1.9050	%	One-Month LIBOR	9/1/2016	12/1/2022	(45		)	—
50,000			1.9079	%	One-Month LIBOR	9/1/2016	12/1/2022	(32		)	—
36,200		-1	3.8300	%	One-Month LIBOR + 2.25%	11/2/2010	11/2/2015	—			(400		)
100,000			0.8320	%	One-Month LIBOR	1/3/2012	9/1/2015	—			(407		)
100,000			0.8320	%	One-Month LIBOR	1/3/2012	9/1/2015	—			(407		)
								$	(3,107	)	$	(1,581	)

(1) The notional amount of this instrument is scheduled to amortize to $12.1 million.

Each of the one-month LIBOR interest rate swaps set forth in the table above was designated as a cash flow hedge of interest rate risk.

The table below sets forth the fair value of our interest rate derivatives as well as their classification on our consolidated balance sheets (in thousands):

		Fair Value at
		December 31,
Derivatives	Balance Sheet Location	2015			2014
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets	$	53		$	274
Interest rate swaps designated as cash flow hedges	Interest rate derivatives	(3,160		)	(1,855		)

The table below presents the effect of our interest rate derivatives on our consolidated statements of operations and comprehensive income (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Amount of (losses) gains recognized in accumulated other comprehensive income (loss) (“AOCI”) (effective portion)	$	(4,739	)	$	(7,799	)	$	6,791
Amount of losses reclassified from AOCI into interest expense (effective portion)	3,599			2,990			2,740
Amount of loss recognized in interest expense (ineffective portion)	386			—			—
Amount of loss reclassified from AOCI into loss on early extinguishment of debt	—			38			—

Over the next 12 months, we estimate that approximately $3.3 million of losses will be reclassified from AOCI as an increase to interest expense.

We have agreements with each of our interest rate derivative counterparties that contain provisions under which, if we default or are capable of being declared in default on defined levels of our indebtedness, we could also be declared in default on our derivative obligations.  These agreements also incorporate the loan covenant provisions of our indebtedness with a lender affiliate of the derivative counterparties.  Failure to comply with the loan covenant provisions could result in our being declared in default on any derivative instrument obligations covered by the agreements.  As of December 31, 2015, the fair value of interest rate derivatives in a liability position related to these agreements was $3.2 million, excluding the effects of accrued interest and credit valuation adjustments. As of December 31, 2015, we had not posted any collateral related to these agreements.  We are not in default with any of these provisions.  If we breached any of these provisions, we could be required to settle our obligations under the agreements at their termination value of $3.6 million.

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Redeemable Noncontrolling Interest

12 Months Ended

Dec. 31, 2015

Noncontrolling Interest [Abstract]

Redeemable Noncontrolling Interest

Redeemable Noncontrolling Interests

The table below sets forth the activity in redeemable noncontrolling interests in our LW Redstone, LLC and Stevens Investors, LLC joint ventures described in Note 6 (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Beginning balance	$	18,417		$	17,758		$	10,298
Contributions from noncontrolling interests	1,654			—			—
Distributions to noncontrolling interests	(2,964		)	(1,369		)	(1,037		)
Net income attributable to noncontrolling interests	2,227			2,162			1,376
Adjustment to arrive at fair value of interests	(116		)	(134		)	7,121
Ending balance	$	19,218		$	18,417		$	17,758

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Equity - COPT and Subsidiaries

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Equity - COPT and Subsidiaries

Equity - COPT and Subsidiaries

Preferred Shares

As of December 31, 2015, COPT had 25.0 million preferred shares authorized at $0.01 par value per share. The table below sets forth additional information pertaining to COPT’s outstanding preferred shares (dollars in thousands, except per share data):

Series	# of Shares Issued	Aggregate Liquidation Preference		Month of Issuance	Annual Dividend Yield		Annual Dividend Per Share		Earliest Redemption Date
Series K	531,667	$	26,583	January 2007	5.600	%	$	2.80000	1/9/2017
Series L	6,900,000	172,500		June 2012	7.375	%	$	1.84375	6/27/2017
	7,431,667	$	199,083

Each series of preferred shares is nonvoting and redeemable for cash in the amount of its liquidation preference at COPT’s option on or after the earliest redemption date. The Series K Cumulative Redeemable Preferred Shares are also convertible, subject to certain conditions, into common shares on the basis of 0.8163 common shares for each preferred share. Holders of all preferred shares are entitled to cumulative dividends, payable quarterly (as and if declared by the Board of Trustees). In the case of each series of preferred shares, there is a series of COPLP preferred units owned by COPT that carries substantially the same terms.

COPT redeemed all of the outstanding shares of its 7.500% Series H Preferred Shares on June 16, 2014 at a price of $25.00 per share, or $50.0 million in the aggregate, plus accrued and unpaid dividends thereon through the date of redemption, and recognized a $1.8 million decrease to net income available to common shareholders pertaining to the shares’ original issuance costs incurred at the time of the redemption.

Common Shares

COPT completed the public offering of 5.52 million common shares in November 2014 at an offering price of $27.30 per share for net proceeds of $148.9 million after underwriter discounts but before offering expenses. COPT contributed the net proceeds from this issuance to COPLP in exchange for an equal number of units in COPLP.

In October 2012, COPT established an at-the-market (“ATM”) stock offering program under which it may, from time to time, offer and sell common shares in “at the market” stock offerings having an aggregate gross sales price of up to $150.0 million. Through December 31, 2015, COPT issued the following common shares under the program:

• 1.5 million shares on July 15, 2013 at a weighted average price of $26.05 per share. Net proceeds from the shares issued totaled $38.5 million, after payment of $0.6 million in commissions to sales agents; and

• 890,241 common shares issued in 2015 at a weighted average price of $30.29 per share. Net proceeds from the shares issued totaled $26.6 million, after payment of $0.4 million in commissions to sales agents.

COPT contributed the net proceeds from these issuances to COPLP in exchange for an equal number of units in COPLP. COPT’s remaining capacity under the ATM Plan is an aggregate gross sales price of $84.0 million in common share sales.

Holders of COPLP common units converted their units into COPT common shares on the basis of one common share for each common unit in the amount of 160,160 in 2015, 140,149 in 2014 and 311,343 in 2013.

COPT declared dividends per common share of $1.10 in 2015, 2014 and 2013.

See Note 15 for disclosure of common share activity pertaining to our share-based compensation plans.

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Equity - COPLP and Subsidiaries

12 Months Ended

Dec. 31, 2015

Class of Stock [Line Items]

Equity - COPLP and Subsidiaries

Equity - COPT and Subsidiaries

Preferred Shares

As of December 31, 2015, COPT had 25.0 million preferred shares authorized at $0.01 par value per share. The table below sets forth additional information pertaining to COPT’s outstanding preferred shares (dollars in thousands, except per share data):

Series	# of Shares Issued	Aggregate Liquidation Preference		Month of Issuance	Annual Dividend Yield		Annual Dividend Per Share		Earliest Redemption Date
Series K	531,667	$	26,583	January 2007	5.600	%	$	2.80000	1/9/2017
Series L	6,900,000	172,500		June 2012	7.375	%	$	1.84375	6/27/2017
	7,431,667	$	199,083

Each series of preferred shares is nonvoting and redeemable for cash in the amount of its liquidation preference at COPT’s option on or after the earliest redemption date. The Series K Cumulative Redeemable Preferred Shares are also convertible, subject to certain conditions, into common shares on the basis of 0.8163 common shares for each preferred share. Holders of all preferred shares are entitled to cumulative dividends, payable quarterly (as and if declared by the Board of Trustees). In the case of each series of preferred shares, there is a series of COPLP preferred units owned by COPT that carries substantially the same terms.

COPT redeemed all of the outstanding shares of its 7.500% Series H Preferred Shares on June 16, 2014 at a price of $25.00 per share, or $50.0 million in the aggregate, plus accrued and unpaid dividends thereon through the date of redemption, and recognized a $1.8 million decrease to net income available to common shareholders pertaining to the shares’ original issuance costs incurred at the time of the redemption.

Common Shares

COPT completed the public offering of 5.52 million common shares in November 2014 at an offering price of $27.30 per share for net proceeds of $148.9 million after underwriter discounts but before offering expenses. COPT contributed the net proceeds from this issuance to COPLP in exchange for an equal number of units in COPLP.

In October 2012, COPT established an at-the-market (“ATM”) stock offering program under which it may, from time to time, offer and sell common shares in “at the market” stock offerings having an aggregate gross sales price of up to $150.0 million. Through December 31, 2015, COPT issued the following common shares under the program:

• 1.5 million shares on July 15, 2013 at a weighted average price of $26.05 per share. Net proceeds from the shares issued totaled $38.5 million, after payment of $0.6 million in commissions to sales agents; and

• 890,241 common shares issued in 2015 at a weighted average price of $30.29 per share. Net proceeds from the shares issued totaled $26.6 million, after payment of $0.4 million in commissions to sales agents.

COPT contributed the net proceeds from these issuances to COPLP in exchange for an equal number of units in COPLP. COPT’s remaining capacity under the ATM Plan is an aggregate gross sales price of $84.0 million in common share sales.

Holders of COPLP common units converted their units into COPT common shares on the basis of one common share for each common unit in the amount of 160,160 in 2015, 140,149 in 2014 and 311,343 in 2013.

COPT declared dividends per common share of $1.10 in 2015, 2014 and 2013.

See Note 15 for disclosure of common share activity pertaining to our share-based compensation plans.

Corporate Office Properties, L.P. [Member]

Class of Stock [Line Items]

Equity - COPLP and Subsidiaries

Equity - COPLP and Subsidiaries

General Partner Preferred Units

The table below sets forth information pertaining to preferred units in COPLP held by COPT at December 31, 2015 (dollars in thousands, except per unit data):

Series	# of Units Issued	Aggregate Liquidation Preference		Month of Issuance	Annual Distribution Yield		Annual Distribution Per Unit		Earliest Redemption Date
Series K	531,667	$	26,583	January 2007	5.600	%	$	2.80000	1/9/2017
Series L	6,900,000	172,500		June 2012	7.375	%	$	1.84375	6/27/2017
	7,431,667	$	199,083

In the case of each series of preferred units, COPT had preferred shares that carry substantially the same terms. Each series of preferred units are redeemable for cash in the amount of its liquidation preference at our option on or after the earliest redemption date. The Series K Preferred Units are also convertible, subject to certain conditions, into common units on the basis of 0.8163 common units for each preferred unit. COPT, as holder of these preferred units, is entitled to cumulative distributions, payable quarterly (as and if declared by the Board of Trustees).

COPLP redeemed all of the outstanding units of its 7.500% Series H Preferred Units held by COPT on June 16, 2014 at a price of $25.00 per unit, or $50.0 million in the aggregate, plus accrued and unpaid distributions thereon through the date of redemption, and recognized a $1.8 million decrease to net income available to common unitholders pertaining to the units’ original issuance costs at the time of the redemption.

Limited Partner Preferred Units

COPLP has 352,000 Series I Preferred Units issued to an unrelated party that have an aggregate liquidation preference of $8.8 million ($25.00 per unit), plus any accrued and unpaid distributions of return thereon (as described below), and may be redeemed for cash by COPLP at COPLP’s option any time after September 22, 2019. The owner of these units is entitled to a priority annual cumulative return equal to 7.5% of their liquidation preference through September 22, 2019; the annual cumulative preferred return increases for each subsequent five-year period, subject to certain maximum limits. These units are convertible into common units on the basis of 0.5 common units for each Series I Preferred Unit; the resulting common units would then be exchangeable for COPT common shares in accordance with the terms of COPLP’s agreement of limited partnership.

Common Units

COPT owned 96.3% of COPLP’s common units as of December 31, 2015 and 96.0% as of December 31, 2014.

COPT acquired additional common units through the public offering of 5.52 million common shares in November 2014 at an offering price of $27.30 per share for net proceeds of $148.9 million (after underwriter discounts but before offering expenses) that were contributed to COPLP in exchange for an equal number of common units in COPLP.

Through December 31, 2015, COPT issued the following common shares under the ATM program:

• 1.5 million common shares on July 15, 2013 at a weighted average price of $26.05 per share. Net proceeds from the shares issued totaled $38.5 million, after payment of $0.6 million in commissions to sales agents; and

• 890,241 common shares in 2015 at a weighted average price of $30.29 per share; net proceeds from the shares issued totaled $26.6 million, after payment of $0.4 million in commissions to sales agents.

COPT contributed the net proceeds from these issuances to COPLP in exchange for an equal number of units in COPLP.

Limited partners in COPLP holding common units have the right to require COPLP to redeem all or a portion of their common units. COPLP (or COPT as the general partner) has the right, in its sole discretion, to deliver to such redeeming limited partners for each partnership unit either one COPT common share (subject to anti-dilution adjustment) or a cash payment equal to the then fair market value of such share (so adjusted) (based on the formula for determining such value set forth in the partnership agreement). Limited partners holding common units redeemed their units into common shares on the basis of one common share for each common unit in the amount of 160,160 in 2015, 140,149 in 2014 and 311,343 in 2013.

We declared distributions per common unit of $1.10 in 2015, 2014 and 2013.

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Share-Based Compensation and Other Compensation Matters

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation and Other Compensation Matters

Share-Based Compensation and Other Compensation Matters

Share-Based Compensation Plans

In May 2010, COPT adopted the Amended and Restated 2008 Omnibus Equity and Incentive Plan. COPT may issue equity-based awards under this plan to officers, employees, non-employee trustees and any other key persons of us and our subsidiaries, as defined in the plan. The plan provides for a maximum of 5.9 million common shares in COPT to be issued in the form of options, share appreciation rights, deferred share awards, restricted share awards, unrestricted share awards, performance shares, dividend equivalent rights and other equity-based awards and for the granting of cash-based awards. The plan expires on May 13, 2020.

In March 1998, COPT adopted a long-term incentive plan for our Trustees and employees. This plan, which expired in March 2008, provided for the award of options, restricted shares and dividend equivalents.

Awards under these plans to nonemployee Trustees generally vest on the first anniversary of the grant date provided that the Trustee remains in his or her position. Awards granted to employees vest based on increments and over periods of time set forth under the terms of the respective awards provided that the employees remain employed by us. Options expire ten years after the date of grant. Shares for each of the share-based compensation plans are issued under registration statements on Form S-8 that became effective upon filing with the Securities and Exchange Commission. In connection with awards of common shares granted by COPT under such share-based compensation plans, COPLP issues to COPT an equal number of equity instruments with identical terms.

The following table summarizes restricted shares under the share-based compensation plans for 2013, 2014 and 2015:

	Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2012	434,643		$	29.67
Granted	193,833		25.91
Forfeited	(9,541	)	27.59
Vested	(241,487	)	30.97
Unvested at December 31, 2013	377,448		26.96
Granted	216,607		26.73
Forfeited	(21,335	)	25.10
Vested	(182,213	)	28.56
Unvested at December 31, 2014	390,507		26.19
Granted	201,024		28.69
Forfeited	(10,550	)	26.05
Vested	(202,781	)	26.07
Unvested at December 31, 2015	378,200		$	27.58
Unvested shares as of December 31, 2015 that are expected to vest	364,666		$	27.61

The aggregate intrinsic value of restricted shares that vested was $4.9 million in 2015, $4.9 million in 2014 and $6.3 million in 2013.

We made the following grants of PSUs to executives from 2011 through 2015 (dollars in thousands):

Grant Date	Number of PSUs Granted	Performance Period Commencement Date	Performance Period End Date	Grant Date Fair Value		Number of PSUs Outstanding as of December 31, 2015
3/3/2011	56,883	3/3/2011	3/2/2014	$	2,796	—
3/1/2012	54,070	1/1/2012	12/31/2014	1,772		—
3/1/2013	69.579	1/1/2013	12/31/2015	1,867		51,556
3/6/2014	49,103	1/1/2014	12/31/2016	1,723		37,843
3/5/2015	45,656	1/1/2015	12/31/2017	1,678		45,656

The PSUs each have three year performance periods concluding on the earlier of the respective performance period end dates set forth above or the date of: (1) termination by us without cause, death or disability of the executive or constructive discharge of the executive (collectively, “qualified termination”); or (2) a sale event.  The number of PSUs earned (“earned PSUs”) at the end of the performance period will be determined based on the percentile rank of COPT’s total shareholder return relative to a peer group of companies, as set forth in the following schedule:

Percentile Rank	Earned PSUs Payout %
75th or greater	200% of PSUs granted
50th or greater	100% of PSUs granted
25th	50% of PSUs granted
Below 25th	0% of PSUs granted

If the percentile rank exceeds the 25th percentile and is between two of the percentile ranks set forth in the table above, then the percentage of the earned PSUs will be interpolated between the ranges set forth in the table above to reflect any performance between the listed percentiles.  At the end of the performance period, we, in settlement of the award, will issue a number of fully-vested COPT common shares equal to the sum of:

• the number of earned PSUs in settlement of the award plan; plus

• the aggregate dividends that would have been paid with respect to the common shares issued in settlement of the earned PSUs through the date of settlement had such shares been issued on the grant date, divided by the share price on such settlement date, as defined under the terms of the agreement.

If a performance period ends due to a sale event or qualified termination, the number of earned PSUs is prorated based on the portion of the three-year performance period that has elapsed.  If employment is terminated by the employee or by us for cause, all PSUs are forfeited.  PSUs do not carry voting rights.

Based on COPT’s total shareholder return relative to its peer group of companies:

• for the 2011 PSUs that vested in 2014, there was no payout value in connection with the vesting;

• for the 2012 PSUs that vested in 2014, we issued 40,309 common shares in settlement of the PSUs on March 5, 2015;

• for 2013 and 2014 PSUs issued to Mr. Stephen E. Riffee, our former Chief Financial Officer who departed on February 3, 2015, we issued 15,289 common shares on March 5, 2015 in settlement of such PSUs; and

• for the 2013 PSUs that vested on December 31, 2015, there was no payout value in connection with the vesting.

We computed grant date fair values for PSUs using Monte Carlo models and are recognizing these values over three-year periods that commenced on the respective grant dates. The grant date fair value and certain of the assumptions used in the Monte Carlo models for the PSUs granted in 2013, 2014 and 2015 are set forth below:

	For the Years Ended December 31,
	2015			2014			2013
Grant date fair value	$	36.76		$	35.09		$	26.84
Baseline common share value	$	29.28		$	26.52		$	25.85
Expected volatility of common shares	19.9		%	28.6		%	29.5		%
Risk-free interest rate	0.99		%	0.66		%	0.33		%

In 2015, nonemployee members of our Board of Trustees were granted a total of 24,056 deferred share awards with an aggregate grant date fair value of $642,000 ($26.70 per share). Deferred share awards vest on the first anniversary of the grant date, provided that the Trustee remains in his or her position. We settle deferred share awards by issuing an equivalent number of common shares upon vesting of the awards or a later date elected by the Trustee (generally upon cessation of being a Trustee). In 2015, we issued 15,485 common shares in settlement of deferred share awards granted in 2014; these shares had a grant date fair value of $26.77 per share, and the aggregate intrinsic value of the shares on the settlement date was $413,000.

We have not issued options since 2009, and all of our options were vested and fully expensed as of December 31, 2015. The table below sets forth information regarding our outstanding options (dollars in thousands, except per share data):

	Options Outstanding and Exercisable	Weighted Average Exercise Price Per Share	Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
December 31, 2012	798,210	$37.62	3	$	325
December 31, 2013	640,927	$38.11	2	$	68
December 31, 2014	559,736	$39.60	2	$	167
December 31, 2015	425,347	$42.75	1	$	—

The aggregate intrinsic value of options exercised was $300,000 in 2015, $225,000 in 2014 and $258,000 in 2013.

We own a taxable REIT subsidiary that is subject to Federal and state income taxes. We realized a windfall tax loss of $513,000 in 2015, $3,000 in 2014 and $122,000 in 2013 on options exercised and vesting restricted shares in connection with employees of that subsidiary.

The table below sets forth our reporting for share based compensation cost (in thousands):

	For the Years Ended December 31,
	2015		2014		2013
General, administrative and leasing expenses	$	5,574	$	5,307	$	5,412
Property operating expenses	1,000		857		1,118
Capitalized to development activities	824		886		1,075
Share-based compensation cost	$	7,398	$	7,050	$	7,605

The amounts included in our consolidated statements of operations for share-based compensation reflected an estimate of pre-vesting forfeitures of 0% for PSUs and deferred share awards and 0% to 5% for restricted shares.

As of December 31, 2015, unrecognized compensation costs related to unvested awards included:

• $6.3 million on restricted shares expected to be recognized over a weighted average period of approximately two years;

• $1.7 million on PSUs expected to be recognized over a weighted average performance period of approximately two years and

• $223,000 on deferred share awards expected to be recognized through May 2016.

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Operating Leases

12 Months Ended

Dec. 31, 2015

Leases, Operating [Abstract]

Operating Leases

Operating Leases

We lease our properties to tenants under operating leases with various expiration dates extending to the year 2030. Gross minimum future rentals on noncancelable leases in our properties as of December 31, 2015 were as follows (in thousands):

Year Ending December 31,
2016	$	378,780
2017	349,192
2018	278,714
2019	218,977
2020	154,207
Thereafter	433,892
	$	1,813,762

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Information by Business Segment

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Information by Business Segment

Information by Business Segment

Effective in the quarter ended December 31, 2015, we changed the reportable segments that we use to review operating results and make decisions regarding segment performance and resource allocation. Given the changes in our portfolio resulting from development, acquisition and disposition activities, we made this change to better align our segments with our business strategy by contemplating the market characteristics of our properties. Our new segment reporting includes the following segments: Defense/IT Locations; Regional Office; our operating wholesale data center; and other. Our segment reporting also includes reporting for Defense/IT Locations sub-segments, which include the following: Fort George G. Meade and the Baltimore/Washington Corridor (referred to herein as “Fort Meade/BW Corridor”); Northern Virginia Defense/IT Locations; Lackland Air Force Base (in San Antonio); locations serving the U.S. Navy ( “Navy Support Locations”), which included properties proximate to the Washington Navy Yard, the Naval Air Station Patuxent River in Maryland and the Naval Surface Warfare Center Dahlgren Division in Virginia); Redstone Arsenal (in Huntsville); Colorado Defense/IT Locations; and data center shells (properties leased to tenants to be operated as data centers in which the tenants generally fund the costs for the power, fiber connectivity and data center infrastructure). The table below reports segment financial information for our reportable segments (in thousands).  We measure the performance of our segments through the measure we define as NOI from real estate operations, which is derived by subtracting property operating expenses from revenues from real estate operations.

	Operating Office Property Segments
	Defense/Information Technology Locations
	Fort Meade/BW Corridor		Northern Virginia Defense/IT		Lackland Air Force Base		Navy Support Locations		Redstone Arsenal		Colorado Defense/IT		Data Center Shells		Total Defense/IT Locations		Regional Office		Operating Wholesale Data Center		Other			Total
Year Ended December 31, 2015
Revenues from real estate operations	$	244,274	$	49,199	$	39,659	$	28,177	$	11,228	$	—	$	21,746	$	394,283	$	98,165	$	19,032	$	7,588		$	519,068
Property operating expenses	83,309		20,107		22,004		13,229		3,497		—		2,298		144,444		36,165		10,402		3,477			194,488
NOI from real estate operations	$	160,965	$	29,092	$	17,655	$	14,948	$	7,731	$	—	$	19,448	$	249,839	$	62,000	$	8,630	$	4,111		$	324,580
Additions to long-lived assets	$	31,883	$	90,248	$	—	$	7,656	$	883	$	—	$	—	$	130,670	$	204,139	$	132	$	328		$	335,269
Transfers from non-operating properties	$	45,560	$	50,690	$	32,307	$	1,408	$	13,190	$	—	$	51,492	$	194,647	$	22,313	$	89,745	$	415		$	307,120
Segment assets at December 31, 2015	$	1,290,028	$	411,196	$	134,381	$	196,090	$	108,038	$	—	$	203,013	$	2,342,746	$	608,471	$	243,338	$	70,914		$	3,265,469
Year Ended December 31, 2014
Revenues from real estate operations	$	233,764	$	48,313	$	34,463	$	31,335	$	10,446	$	—	$	18,421	$	376,742	$	85,025	$	10,430	$	7,514		$	479,711
Property operating expenses	80,824		19,071		19,677		12,576		3,066		—		2,272		137,486		31,427		7,286		3,600			179,799
NOI from real estate operations	$	152,940	$	29,242	$	14,786	$	18,759	$	7,380	$	—	$	16,149	$	239,256	$	53,598	$	3,144	$	3,914		$	299,912
Additions to long-lived assets	$	24,173	$	7,119	$	—	$	10,010	$	4,077	$	—	$	—	$	45,379	$	19,290	$	22	$	(90	)	$	64,601
Transfers from non-operating properties	$	56,699	$	360	$	—	$	—	$	21,014	$	—	$	43,154	$	121,227	$	17,942	$	1,108	$	1,622		$	141,899
Segment assets at December 31, 2014	$	1,264,353	$	372,041	$	102,232	$	195,972	$	97,209	$	—	$	156,214	$	2,188,021	$	526,988	$	163,177	$	73,309		$	2,951,495
Year Ended December 31, 2013
Revenues from real estate operations	$	234,857	$	56,524	$	31,252	$	33,431	$	5,050	$	12,229	$	12,520	$	385,863	$	98,487	$	7,271	$	7,012		$	498,633
Property operating expenses	80,149		19,718		16,784		12,872		1,282		3,797		1,304		135,906		35,488		6,360		2,950			180,704
NOI from real estate operations	$	154,708	$	36,806	$	14,468	$	20,559	$	3,768	$	8,432	$	11,216	$	249,957	$	62,999	$	911	$	4,062		$	317,929
Additions to long-lived assets	$	28,009	$	5,522	$	5	$	4,945	$	3,563	$	200	$	—	$	42,244	$	13,244	$	598	$	791		$	56,877
Transfers from non-operating properties	$	50,067	$	37,234	$	—	$	14	$	48,799	$	987	$	24,200	$	161,301	$	32,692	$	70,106	$	191		$	264,290
Segment assets at December 31, 2013	$	1,229,192	$	385,061	$	103,650	$	195,105	$	77,773	$	—	$	117,012	$	2,107,793	$	556,718	$	166,790	$	74,329		$	2,905,630

The following table reconciles our segment revenues to total revenues as reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015			2014		2013
Segment revenues from real estate operations	$	519,068		$	479,711	$	498,633
Construction contract and other service revenues	106,402			106,748		62,363
Less: Revenues from discontinued operations (Note 18)	(4		)	14		(37,636		)
Total revenues	$	625,466		$	586,473	$	523,360

The following table reconciles our segment property operating expenses to property operating expenses as reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015		2014		2013
Segment property operating expenses	$	194,488	$	179,799	$	180,704
Less: Property operating expenses from discontinued operations (Note 18)	6		135		(13,505		)
Total property operating expenses	$	194,494	$	179,934	$	167,199

As previously discussed, we provide real estate services such as property management and construction and development services primarily for our properties but also for third parties.  The primary manner in which we evaluate the operating performance of our service activities is through a measure we define as net operating income from service operations (“NOI from service operations”), which is based on the net of revenues and expenses from these activities.  Construction contract and other service revenues and expenses consist primarily of subcontracted costs that are reimbursed to us by the customer along with a management fee. The operating margins from these activities are small relative to the revenue.  We believe NOI from service operations is a useful measure in assessing both our level of activity and our profitability in conducting such operations. The table below sets forth the computation of our NOI from service operations (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Construction contract and other service revenues	$	106,402		$	106,748		$	62,363
Construction contract and other service expenses	(102,696		)	(100,058		)	(58,875		)
NOI from service operations	$	3,706		$	6,690		$	3,488

The following table reconciles our NOI from real estate operations for reportable segments and NOI from service operations to income from continuing operations as reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
NOI from real estate operations	$	324,580		$	299,912		$	317,929
NOI from service operations	3,706			6,690			3,488
Interest and other income	4,517			4,923			3,834
Equity in income of unconsolidated entities	62			229			2,110
Income tax expense	(199		)	(310		)	(1,978		)
Other adjustments:	—
Depreciation and other amortization associated with real estate operations	(140,025		)	(136,086		)	(113,214		)
Impairment losses	(23,289		)	(1,416		)	(5,857		)
General, administrative and leasing expenses	(31,361		)	(31,794		)	(30,869		)
Business development expenses and land carry costs	(13,507		)	(5,573		)	(5,436		)
Interest expense on continuing operations	(89,074		)	(92,393		)	(82,010		)
NOI from discontinued operations	(10		)	(121		)	(24,131		)
Gain (loss) on early extinguishment of debt	85,275			(9,552		)	(27,030		)
COPT consolidated income from continuing operations	$	120,675		$	34,509		$	36,836

The following table reconciles our segment assets to the consolidated total assets of COPT and subsidiaries (in thousands):

	As of December 31,
	2015		2014
Segment assets	$	3,265,469	$	2,951,495
Non-operating property assets	450,679		567,586
Other assets	193,164		145,155
Total COPT consolidated assets	$	3,909,312	$	3,664,236

The accounting policies of the segments are the same as those used to prepare our consolidated financial statements, except that discontinued operations are not presented separately for segment purposes.  In the segment reporting presented above, we did not allocate interest expense, depreciation and amortization, impairment losses, loss on early extinguishment of debt and gain on sales of real estate to our real estate segments since they are not included in the measure of segment profit reviewed by management.  We also did not allocate general and administrative expenses, business development expenses and land carry costs, interest and other income, equity in income of unconsolidated entities, income taxes and noncontrolling interests because these items represent general corporate or non-operating property items not attributable to segments.

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Discontinued Operations

12 Months Ended

Dec. 31, 2015

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

Discontinued Operations

Income from discontinued operations primarily includes revenues and expenses associated with the following:

• 920 Elkridge Landing Road in the Baltimore/Washington Corridor that was sold on June 25, 2013;

• 4230 Forbes Boulevard in the Baltimore/Washington Corridor that was sold on December 11, 2013;

• 15 operating properties in Colorado Springs that were sold on December 12, 2013; and

• nine operating properties in the Baltimore/Washington Corridor and five operating properties in Colorado Springs for which the title to the properties was transferred to the mortgage lender on December 23, 2013.

The table below sets forth the components of discontinued operations reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Revenue from real estate operations	$	4		$	(14	)	$	37,636
Property operating expenses	6			135			(13,505		)
Depreciation and amortization	—			—			(4,505		)
Impairment losses	(234		)	(3		)	(26,190		)
General, administrative and leasing expenses	—			—			(4		)
Interest expense	—			—			(8,221		)
Gain on sales of real estate	—			24			2,671
Gain (loss) on early extinguishment of debt	380			(116		)	67,810
Discontinued operations	$	156		$	26		$	55,692

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Earnings Per Share ("EPS") and Earnings Per Unit (“EPU”)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Abstract]

Earnings Per Share (“EPS”) and Earnings Per Unit (“EPU”)

Earnings Per Share (“EPS”) and Earnings Per Unit (“EPU”)

COPT and Subsidiaries EPS

We present both basic and diluted EPS.  We compute basic EPS by dividing net income available to common shareholders allocable to unrestricted common shares under the two-class method by the weighted average number of unrestricted common shares outstanding during the period.  Our computation of diluted EPS is similar except that:

• the denominator is increased to include: (1) the weighted average number of potential additional common shares that would have been outstanding if securities that are convertible into COPT common shares were converted; and (2) the effect of dilutive potential common shares outstanding during the period attributable to share-based compensation using the treasury stock or if-converted methods; and

• the numerator is adjusted to add back any changes in income or loss that would result from the assumed conversion into common shares that we added to the denominator.

Summaries of the numerator and denominator for purposes of basic and diluted EPS calculations are set forth below (in thousands, except per share data):

	For the Years Ended December 31,
	2015			2014			2013
Numerator:
Income from continuing operations	$	120,675		$	34,509		$	36,836
Gain on sales of real estate, net	68,047			10,671			9,016
Preferred share dividends	(14,210		)	(15,939		)	(19,971		)
Issuance costs associated with redeemed preferred shares	—			(1,769		)	(2,904		)
Income from continuing operations attributable to noncontrolling interests	(10,575		)	(4,955		)	(4,486		)
Income from continuing operations attributable to restricted shares	(706		)	(432		)	(414		)
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	$	163,231		$	22,085		$	18,077
Dilutive effect of common units in the Operating Partnership on diluted EPS from continuing operations	6,397			—			—
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders	$	169,628		$	22,085		$	18,077
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	$	163,231		$	22,085		$	18,077
Discontinued operations	156			26			55,692
Discontinued operations attributable to noncontrolling interests	(3		)	4			(3,351		)
Numerator for basic EPS on net income attributable to COPT common shareholders	$	163,384		$	22,115		$	70,418
Dilutive effect of common units in COPLP	6,403			—			—
Numerator for diluted EPS on net income attributable to COPT common shareholders	$	169,787		$	22,115		$	70,418
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	93,914			88,092			85,167
Dilutive effect of common units	3,692			—			—
Dilutive effect of share-based compensation awards	61			171			57
Denominator for diluted EPS (common shares)	97,667			88,263			85,224
Basic EPS:
Income from continuing operations attributable to COPT common shareholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPT common shareholders	—			—			0.62
Net income attributable to COPT common shareholders	$	1.74		$	0.25		$	0.83
Diluted EPS:
Income from continuing operations attributable to COPT common shareholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPT common shareholders	—			—			0.62
Net income attributable to COPT common shareholders	$	1.74		$	0.25		$	0.83

Our diluted EPS computations do not include the effects of the following securities since the conversions of such securities would increase diluted EPS for the respective periods (in thousands):

	Weighted Average Shares Excluded from Denominator for the Years Ended December 31,
	2015	2014	2013
Conversion of common units	—	3,897	3,869
Conversion of Series I preferred units	176	176	176
Conversion of Series K preferred shares	434	434	434

The following share-based compensation securities were excluded from the computation of diluted EPS because their effect was antidilutive:

• weighted average restricted shares and deferred share awards of 410,000 for 2015, 401,000 for 2014 and 385,000 for 2013; and

• weighted average options of 469,000 for 2015, 492,000 for 2014 and 636,000 for 2013, respectively.

As discussed in Note 10, we had outstanding senior notes with an exchange settlement feature, but such notes did not affect our diluted EPS reported above since the weighted average closing price of COPT’s common shares during each of the periods was less than the exchange prices per common share applicable for such periods.

COPLP and Subsidiaries EPU

We present both basic and diluted EPU.  We compute basic EPU by dividing net income available to common unitholders allocable to unrestricted common units under the two-class method by the weighted average number of unrestricted common units outstanding during the period.  Our computation of diluted EPU is similar except that:

• the denominator is increased to include: (1) the weighted average number of potential additional common units that would have been outstanding if securities that are convertible into our common units were converted; and (2) the effect of dilutive potential common units outstanding during the period attributable to share-based compensation using the treasury stock or if-converted methods; and

• the numerator is adjusted to add back any changes in income or loss that would result from the assumed conversion into common units that we added to the denominator.

Summaries of the numerator and denominator for purposes of basic and diluted EPU calculations are set forth below (in thousands, except per unit data):

	For the Years Ended December 31,
	2015			2014			2013
Numerator:
Income from continuing operations	$	120,675		$	34,509		$	36,836
Gain on sales of real estate, net	68,047			10,671			9,016
Preferred unit distributions	(14,870		)	(16,599		)	(20,631		)
Issuance costs associated with redeemed preferred units	—			(1,769		)	(2,904		)
Income from continuing operations attributable to noncontrolling interests	(3,523		)	(3,281		)	(2,977		)
Income from continuing operations attributable to restricted units	(706		)	(432		)	(414		)
Numerator for basic and diluted EPU from continuing operations attributable to COPLP common unitholders	$	169,623		$	23,099		$	18,926
Discontinued operations	156			26			55,692
Discontinued operations attributable to noncontrolling interests	3			5			(930		)
Numerator for basic and diluted EPU on net income attributable to COPLP common unitholders	$	169,782		$	23,130		$	73,688
Denominator (all weighted averages):
Denominator for basic EPU (common units)	97,606			91,989			89,036
Dilutive effect of share-based compensation awards	61			171			57
Denominator for diluted EPU (common units)	97,667			92,160			89,093
Basic EPU:
Income from continuing operations attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPLP common unitholders	—			—			0.62
Net income attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.83
Diluted EPU:
Income from continuing operations attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPLP common unitholders	—			—			0.62
Net income attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.83

Our diluted EPU computations do not include the effects of the following securities since the conversions of such securities would increase diluted EPU for the respective periods (in thousands):

	Weighted Average Units Excluded from Denominator for the Years Ended December 31,
	2015	2014	2013
Conversion of Series I preferred units	176	176	176
Conversion of Series K preferred units	434	434	434

The following share-based compensation securities were excluded from the computation of diluted EPU because their effect was antidilutive:

• weighted average restricted units and deferred share awards of 410,000 for 2015, 401,000 for 2014 and 385,000 for 2013; and

• weighted average options of 469,000 for 2015, 492,000 for 2014 and 636,000 for 2013.

As discussed in Note 10, we had outstanding senior notes with an exchange settlement feature, but such notes did not affect our diluted EPU reported above since the weighted average closing price of COPT’s common shares during each of the periods was less than the exchange prices per common share applicable for such periods

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Litigation

In the normal course of business, we are involved in legal actions arising from our ownership and administration of properties.  We establish reserves for specific legal proceedings when we determine that the likelihood of an unfavorable outcome is probable and the amount of loss can be reasonably estimated.  Management does not anticipate that any liabilities that may result from such proceedings will have a materially adverse effect on our financial position, operations or liquidity.  Our assessment of the potential outcomes of these matters involves significant judgment and is subject to change based on future developments.

Environmental

We are subject to various Federal, state and local environmental regulations related to our property ownership and operation.  We have performed environmental assessments of our properties, the results of which have not revealed any environmental liability that we believe would have a materially adverse effect on our financial position, operations or liquidity. 

Tax Incremental Financing Obligation

In August 2010, Anne Arundel County, Maryland issued $30 million in tax incremental financing bonds to third-party investors in order to finance public improvements needed in connection with our project known as National Business Park North.  The real estate taxes on increases in assessed value of a development district encompassing National Business Park North are to be transferred to a special fund pledged to the repayment of the bonds.  We recognized a $1.9 million liability through December 31, 2015 representing our estimated obligation to fund through a special tax any future shortfalls between debt service on the bonds and real estate taxes available to repay the bonds.

Operating Leases

We are obligated as lessee under operating leases (mostly ground leases) with various expiration dates extending to the year 2100. Future minimum rental payments due under the terms of these operating leases as of December 31, 2015 follow (in thousands):

Year Ending December 31,
2016	$	1,189
2017	1,117
2018	1,071
2019	1,049
2020	1,067
Thereafter	86,798
	$	92,291

Contractual Obligations

We had amounts remaining to be incurred under various contractual obligations as of December 31, 2015 that included the following:

• new development and redevelopment obligations of $87.8 million (including acquisitions of land);

• capital expenditures for operating properties of $47.9 million;

• third party construction and development of $10.7 million; and

• other purchase obligations of $3.6 million.

Environmental Indemnity Agreement

In connection with a lease and subsequent sale in 2008 and 2010 of three properties in Dayton, New Jersey, we agreed to provide certain environmental indemnifications. The prior owner of the properties, a Fortune 100 company that is responsible for groundwater contamination at such properties, previously agreed to indemnify us for (1) direct losses incurred in connection with the contamination and (2) its failure to perform remediation activities required by the State of New Jersey, up to the point that the state declares the remediation to be complete.  Under the environmental indemnification agreement, we agreed to the following:

• to indemnify the tenant against losses covered under the prior owner’s indemnity agreement if the prior owner fails to indemnify the tenant for such losses.  This indemnification is capped at $5.0 million in perpetuity after the State of New Jersey declares the remediation to be complete;

• to indemnify the tenant for consequential damages (e.g., business interruption) at one of the buildings in perpetuity and another of the buildings through 2025.  This indemnification is limited to $12.5 million; and

• to pay 50% of additional costs related to construction and environmental regulatory activities incurred by the tenant as a result of the indemnified environmental condition of the properties.  This indemnification is limited to $300,000 annually and $1.5 million in the aggregate.

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Subsequent Event

12 Months Ended

Dec. 31, 2015

Subsequent Events [Abstract]

Subsequent Event

Subsequent Event

On February 10, 2016, our Board of Trustees appointed Stephen E. Budorick, our Executive Vice President and Chief Operating Officer since September 2011, to become our President and Chief Executive Officer effective May 12, 2016, the date of the Company’s 2016 Annual Meeting of Shareholders. On that date, Roger A. Waesche, Jr., our current President and Chief Executive Officer, will leave the Company to pursue other interests and he will not be nominated for reelection as a Trustee. The Board expects to appoint Mr. Budorick to our Board of Trustees after the 2016 Annual Meeting of Shareholders. In connection with the departure of Mr. Waesche, we will recognize executive transition costs of approximately $2.9 million in 2016.

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Quarterly Data (Unaudited)

12 Months Ended

Dec. 31, 2015

Quarterly Financial Information Disclosure [Abstract]

Quarterly Data (Unaudited)

Quarterly Data (Unaudited)

The tables below set forth selected quarterly information for the years ended December 31, 2015 and 2014 (in thousands, except per share data). Certain of the amounts below have been reclassified to conform to the current period presentation of our consolidated financial statements.

	For the Year Ended December 31, 2015												For the Year Ended December 31, 2014
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter			First Quarter			Second Quarter			Third Quarter			Fourth Quarter
COPT and Subsidiaries
Revenues	$	161,034		$	170,363		$	150,744		$	143,325		$	146,667		$	139,820		$	153,015		$	146,971
Operating income	$	30,575		$	37,471		$	31,993		$	20,055		$	25,206		$	31,836		$	37,422		$	37,148
Income from continuing operations	$	10,987		$	16,839		$	94,279		$	(1,430	)	$	5,660		$	9,248		$	13,727		$	5,874
Discontinued operations	$	(238	)	$	394		$	—		$	—		$	11		$	(198	)	$	191		$	22
Net income	$	14,735		$	17,232		$	94,294		$	62,617		$	5,671		$	9,050		$	24,548		$	5,937
Net income attributable to noncontrolling interests	(1,380		)	(1,451		)	(4,494		)	(3,253		)	(930		)	(1,160		)	(1,828		)	(1,033		)
Net income attributable to COPT	13,355			15,781			89,800			59,364			4,741			7,890			22,720			4,904
Preferred share dividends	(3,552		)	(3,553		)	(3,552		)	(3,553		)	(4,490		)	(4,344		)	(3,553		)	(3,552		)
Issuance costs associated with redeemed preferred shares	—			—			—			—			—			(1,769		)	—			—
Net income attributable to COPT common shareholders	$	9,803		$	12,228		$	86,248		$	55,811		$	251		$	1,777		$	19,167		$	1,352
Basic earnings per common share	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01
Diluted earnings per common share	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01

COPLP and Subsidiaries
Revenues	$	161,034		$	170,363		$	150,744		$	143,325		$	146,667		$	139,820		$	153,015		$	146,971
Operating income	$	30,575		$	37,471		$	31,993		$	20,055		$	25,206		$	31,836		$	37,422		$	37,148
Income from continuing operations	$	10,987		$	16,839		$	94,279		$	(1,430	)	$	5,660		$	9,248		$	13,727		$	5,874
Discontinued operations	$	(238	)	$	394		$	—		$	—		$	11		$	(198	)	$	191		$	22
Net income	$	14,735		$	17,232		$	94,294		$	62,617		$	5,671		$	9,050		$	24,548		$	5,937
Net income attributable to noncontrolling interests	(818		)	(812		)	(972		)	(918		)	(737		)	(837		)	(897		)	(805		)
Net income attributable to COPLP	13,917			16,420			93,322			61,699			4,934			8,213			23,651			5,132
Preferred unit distributions	(3,717		)	(3,718		)	(3,717		)	(3,718		)	(4,655		)	(4,509		)	(3,718		)	(3,717		)
Issuance costs associated with redeemed preferred units	—			—			—			—			—			(1,769		)	—			—
Net income attributable to COPLP common unitholders	$	10,200		$	12,702		$	89,605		$	57,981		$	279		$	1,935		$	19,933		$	1,415
Basic earnings per common unit	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01
Diluted earnings per common unit	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01

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Schedule II - Valuation and Qualifying Accounts (Notes)

12 Months Ended

Dec. 31, 2015

Valuation and Qualifying Accounts [Abstract]

Schedule II—Valuation and Qualifying Accounts

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Schedule II—Valuation and Qualifying Accounts

Years Ended December 31, 2015, 2014 and 2013

(Dollars in thousands)

	Balance at Beginning of Year		Charged to Costs and Expenses (1)			Charged to Other Accounts (2)			Deductions (3)			Balance at End of Year
Accounts Receivables-Allowance for doubtful accounts
Year ended December 31, 2015	$	717	$	1,125		$	98		$	(415	)	$	1,525
Year ended December 31, 2014	$	2,976	$	278		$	—		$	(2,537	)	$	717
Year ended December 31, 2013	$	4,694	$	(65	)	$	—		$	(1,653	)	$	2,976
Allowance for Deferred Rent Receivable
Year ended December 31, 2015	$	1,418	$	—		$	544		$	—		$	1,962
Year ended December 31, 2014	$	2,126	$	—		$	(708	)	$	—		$	1,418
Year ended December 31, 2013	$	913	$	—		$	1,213		$	—		$	2,126
Allowance for Deferred Tax Asset
Year ended December 31, 2015	$	2,062	$	—		$	—		$	—		$	2,062
Year ended December 31, 2014	$	2,062	$	—		$	—		$	—		$	2,062
Year ended December 31, 2013	$	207	$	1,855		$	—		$	—		$	2,062

(1) Amounts charged to costs and expenses are net of recoveries.

(2) Allowances for certain accounts receivables were charged to service company revenue. Deferred rent receivable allowances were charged to rental revenue.

(3) Deductions reflect adjustments to reserves due to actual write-offs of accounts.

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Schedule III - Real Estate and Accumulated Depreciation

12 Months Ended

Dec. 31, 2015

SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]

Schedule III-Real Estate and Accumulated Depreciation

Corporate Office Properties Trust and Subsidiaries and Corporate Office Properties, L.P. and Subsidiaries

Schedule III—Real Estate and Accumulated Depreciation

December 31, 2015

(Dollars in thousands)

				Initial Cost						Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)		Land		Building and Land Improvements		Costs Capitalized Subsequent to Acquisition		Land		Building and Land Improvements		Total (3)(4)		Accumulated Depreciation (5)			Year Built or Renovated	Date Acquired (6)
100 Light Street (O)	Baltimore, MD	$	50,732	$	26,715	$	58,343	$	55	$	26,715	$	58,398	$	85,113	$	(1,588	)	1973	8/7/2015
1000 Redstone Gateway (O)	Huntsville, AL	11,370		—		20,533		—		—		20,533		20,533		(1,438		)	2013	3/23/2010
1100 Redstone Gateway (O)	Huntsville, AL	11,791		—		19,593		—		—		19,593		19,593		(965		)	2014	3/23/2010
114 National Business Parkway (O)	Annapolis Junction, MD	—		364		3,109		60		364		3,169		3,533		(1,125		)	2002	6/30/2000
11751 Meadowville Lane (O)	Richmond, VA	—		1,305		52,098		112		1,305		52,210		53,515		(11,194		)	2007	9/15/2006
1200 Redstone Gateway (O)	Huntsville, AL	13,639		—		22,389		—		—		22,389		22,389		(1,145		)	2013	3/23/2010
1201 M Street (O)	Washington, DC	—		—		49,785		4,225		—		54,010		54,010		(8,947		)	2001	9/28/2010
1201 Winterson Road (O)	Linthicum, MD	—		1,288		12,175		460		1,288		12,635		13,923		(3,824		)	1985 (7)	4/30/1998
1220 12th Street, SE (O)	Washington, DC	—		—		42,464		2,431		—		44,895		44,895		(8,523		)	2003	9/28/2010
1243 Winterson Road (L)	Linthicum, MD	—		630		—		—		630		—		630		—			(8)	12/19/2001
1302 Concourse Drive (O)	Linthicum, MD	—		2,078		8,313		6,559		2,078		14,872		16,950		(6,188		)	1996	11/18/1999
1304 Concourse Drive (O)	Linthicum, MD	—		1,999		12,934		2,884		1,999		15,818		17,817		(6,360		)	2002	11/18/1999
1306 Concourse Drive (O)	Linthicum, MD	—		2,796		11,186		8,152		2,796		19,338		22,134		(6,922		)	1990	11/18/1999
131 National Business Parkway (O)	Annapolis Junction, MD	—		1,906		7,623		3,524		1,906		11,147		13,053		(5,596		)	1990	9/28/1998
132 National Business Parkway (O)	Annapolis Junction, MD	—		2,917		12,259		3,005		2,917		15,264		18,181		(7,700		)	2000	5/28/1999
133 National Business Parkway (O)	Annapolis Junction, MD	—		2,517		10,068		5,204		2,517		15,272		17,789		(8,230		)	1997	9/28/1998
1331 Ashton Road (O)	Hanover, MD	—		587		2,347		1,575		587		3,922		4,509		(1,337		)	1989	4/28/1999
1334 Ashton Road (O)	Hanover, MD	—		736		1,488		2,639		736		4,127		4,863		(2,467		)	1989	4/28/1999
134 National Business Parkway (O)	Annapolis Junction, MD	—		3,684		7,517		3,496		3,684		11,013		14,697		(4,062		)	1999	11/13/1998
1340 Ashton Road (O)	Hanover, MD	—		905		3,620		1,469		905		5,089		5,994		(2,621		)	1989	4/28/1999
1341 Ashton Road (O)	Hanover, MD	—		306		1,223		604		306		1,827		2,133		(932		)	1989	4/28/1999
1343 Ashton Road (O)	Hanover, MD	—		193		774		405		193		1,179		1,372		(640		)	1989	4/28/1999
13450 Sunrise Valley Road (O)	Herndon, VA	—		1,386		5,576		3,335		1,386		8,911		10,297		(3,902		)	1998	7/25/2003
13454 Sunrise Valley Road (O)	Herndon, VA	—		2,899		11,986		6,750		2,899		18,736		21,635		(7,177		)	1998	7/25/2003
135 National Business Parkway (O)	Annapolis Junction, MD	11,125		2,484		9,750		5,700		2,484		15,450		17,934		(6,467		)	1998	12/30/1998
1362 Mellon Road (O)	Hanover, MD	—		1,706		8,670		182		1,706		8,852		10,558		(1,517		)	2006	2/10/2006
13857 McLearen Road (O)	Herndon, VA	—		3,507		30,177		1,565		3,507		31,742		35,249		(6,961		)	2007	7/11/2012
140 National Business Parkway (O)	Annapolis Junction, MD	—		3,407		24,167		688		3,407		24,855		28,262		(7,647		)	2003	12/31/2003
141 National Business Parkway (O)	Annapolis Junction, MD	11,566		2,398		9,590		3,194		2,398		12,784		15,182		(5,963		)	1990	9/28/1998
14280 Park Meadow Drive (O)	Chantilly, VA	—		3,731		15,953		1,764		3,731		17,717		21,448		(6,185		)	1999	9/29/2004
1460 Dorsey Road (L)	Hanover, MD	—		1,800		—		—		1,800		—		1,800		—			(8)	2/28/2006
14840 Conference Center Drive (O)	Chantilly, VA	—		1,572		8,175		2,860		1,572		11,035		12,607		(4,320		)	2000	7/25/2003
14850 Conference Center Drive (O)	Chantilly, VA	—		1,615		8,358		2,947		1,615		11,305		12,920		(4,646		)	2000	7/25/2003
14900 Conference Center Drive (O)	Chantilly, VA	—		3,436		14,402		5,239		3,436		19,641		23,077		(8,221		)	1999	7/25/2003

			Initial Cost			Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)	Land	Building and Land Improvements	Costs Capitalized Subsequent to Acquisition	Land	Building and Land Improvements	Total (3)(4)	Accumulated Depreciation (5)		Year Built or Renovated	Date Acquired (6)
1501 South Clinton Street (O)	Baltimore, MD	—	27,964	52,146	8,165	27,964	60,311	88,275	(14,472	)	2006	10/27/2009
15049 Conference Center Drive (O)	Chantilly, VA	—	4,415	20,365	3,619	4,415	23,984	28,399	(9,236	)	1997	8/14/2002
15059 Conference Center Drive (O)	Chantilly, VA	—	5,753	13,615	2,065	5,753	15,680	21,433	(6,697	)	2000	8/14/2002
15395 John Marshall Highway (O)	Haymarket, VA	—	2,465	24,768	—	2,465	24,768	27,233	(1,195	)	2014	5/7/2013
1550 West Nursery Road (O)	Linthicum, MD	—	14,071	16,930	—	14,071	16,930	31,001	(3,626	)	2009	10/28/2009
1560 West Nursery Road (O)	Linthicum, MD	—	1,441	113	—	1,441	113	1,554	(5	)	2014	10/28/2009
1560A Cable Ranch Road (O) (10)	San Antonio, TX	—	1,097	3,770	394	1,097	4,164	5,261	(1,298	)	1985/2007	6/19/2008
1560B Cable Ranch Road (O) (10)	San Antonio, TX	—	2,299	6,545	159	2,299	6,704	9,003	(1,738	)	1985/2006	6/19/2008
16442 Commerce Drive (O)	Dahlgren, VA	—	613	2,582	883	613	3,465	4,078	(1,332	)	2002	12/21/2004
16480 Commerce Drive (O)	Dahlgren, VA	—	1,856	7,425	1,283	1,856	8,708	10,564	(2,316	)	2000	12/28/2004
16501 Commerce Drive (O)	Dahlgren, VA	—	522	2,090	482	522	2,572	3,094	(797	)	2002	12/21/2004
16539 Commerce Drive (O)	Dahlgren, VA	—	688	2,860	1,524	688	4,384	5,072	(1,934	)	1990	12/21/2004
16541 Commerce Drive (O)	Dahlgren, VA	—	773	3,094	1,368	773	4,462	5,235	(1,727	)	1996	12/21/2004
16543 Commerce Drive (O)	Dahlgren, VA	—	436	1,742	502	436	2,244	2,680	(573	)	2002	12/21/2004
1751 Pinnacle Drive (O)	McLean, VA	—	10,486	42,339	24,059	10,486	66,398	76,884	(23,750	)	1989/1995	9/23/2004
1753 Pinnacle Drive (O)	McLean, VA	—	8,275	34,353	10,894	8,275	45,247	53,522	(15,849	)	1976/2004	9/23/2004
201 Technology Drive (O)	Lebanon, VA	—	726	31,091	59	726	31,150	31,876	(6,358	)	2007	10/5/2007
206 Research Boulevard (O)	Aberdeen, MD	—	1,813	17,485	—	1,813	17,485	19,298	(1,416	)	2012	9/14/2007
209 Research Boulevard (O)	Aberdeen, MD	—	1,045	16,087	79	1,045	16,166	17,211	(2,069	)	2010	9/14/2007
210 Research Boulevard (O)	Aberdeen, MD	—	1,065	15,102	75	1,065	15,177	16,242	(1,569	)	2010	9/14/2007
2100 L Street (L)	Washington, DC	—	1,273	1,685	—	1,273	1,685	2,958	—		(8)	8/11/2015
2100 Rideout Road (O)	Huntsville, AL	—	—	2,586	—	—	2,586	2,586	—		(7)	3/23/2010
21267 Smith Switch Road (O)	Ashburn, VA	—	4,040	10,135	—	4,040	10,135	14,175	(365	)	2014	12/27/2012
21271 Smith Switch Road (O)	Ashburn, VA	—	7,346	18,267	—	7,346	18,267	25,613	(881	)	2013	12/27/2012
22289 Exploration Drive (O)	Lexington Park, MD	—	1,422	5,719	1,660	1,422	7,379	8,801	(2,826	)	2000	3/24/2004
22299 Exploration Drive (O)	Lexington Park, MD	—	1,362	5,791	1,218	1,362	7,009	8,371	(2,641	)	1998	3/24/2004
22300 Exploration Drive (O)	Lexington Park, MD	—	1,094	5,038	1,315	1,094	6,353	7,447	(2,024	)	1997	11/9/2004
22309 Exploration Drive (O)	Lexington Park, MD	—	2,243	10,419	7,787	2,243	18,206	20,449	(4,683	)	1984/1997	3/24/2004
23535 Cottonwood Parkway (O)	California, MD	—	692	3,051	248	692	3,299	3,991	(1,206	)	1984	3/24/2004
250 W Pratt St (O)	Baltimore, MD	—	8,057	34,654	4,765	8,057	39,419	47,476	(1,652	)	1985	3/19/2015
2500 Riva Road (O)	Annapolis, MD	—	2,791	12,145	1	2,791	12,146	14,937	(4,417	)	2000	3/4/2003
2600 Park Tower Drive (O)	Vienna, VA	—	20,304	34,443	346	20,304	34,789	55,093	(1,051	)	1999	4/15/2015
2691 Technology Drive (O)	Annapolis Junction, MD	—	2,098	17,334	5,305	2,098	22,639	24,737	(7,827	)	2005	5/26/2000
2701 Technology Drive (O)	Annapolis Junction, MD	22,053	1,737	15,266	2,821	1,737	18,087	19,824	(7,567	)	2001	5/26/2000
2711 Technology Drive (O)	Annapolis Junction, MD	17,153	2,251	21,611	1,468	2,251	23,079	25,330	(10,158	)	2002	11/13/2000
2720 Technology Drive (O)	Annapolis Junction, MD	—	3,863	29,272	146	3,863	29,418	33,281	(8,316	)	2004	1/31/2002
2721 Technology Drive (O)	Annapolis Junction, MD	—	4,611	14,597	1,263	4,611	15,860	20,471	(6,400	)	2000	10/21/1999
2730 Hercules Road (O)	Annapolis Junction, MD	34,256	8,737	31,612	7,213	8,737	38,825	47,562	(15,674	)	1990	9/28/1998
2900 Towerview Road (O)	Herndon, VA	—	3,207	16,379	6,509	3,207	22,888	26,095	(7,181	)	1982/2008	12/20/2005

			Initial Cost			Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)	Land	Building and Land Improvements	Costs Capitalized Subsequent to Acquisition	Land	Building and Land Improvements	Total (3)(4)	Accumulated Depreciation (5)		Year Built or Renovated	Date Acquired (6)
30 Light Street (O)	Baltimore, MD	4,268	—	12,101	37	—	12,138	12,138	(128	)	2009	8/7/2015
300 Sentinel Drive (O)	Annapolis Junction, MD	—	1,517	59,016	219	1,517	59,235	60,752	(8,458	)	2009	11/14/2003
302 Sentinel Drive (O)	Annapolis Junction, MD	—	2,648	29,687	445	2,648	30,132	32,780	(6,000	)	2007	11/14/2003
304 Sentinel Drive (O)	Annapolis Junction, MD	—	3,411	24,917	193	3,411	25,110	28,521	(6,304	)	2005	11/14/2003
306 Sentinel Drive (O)	Annapolis Junction, MD	15,878	3,260	22,592	611	3,260	23,203	26,463	(5,269	)	2006	11/14/2003
308 Sentinel Drive (O)	Annapolis Junction, MD	—	1,422	26,208	37	1,422	26,245	27,667	(3,050	)	2010	11/14/2003
310 Sentinel Way (O)	Annapolis Junction, MD	—	2,372	36,468	—	2,372	36,468	38,840	(191	)	(7)	11/14/2003
310 The Bridge Street (O)	Huntsville, AL	—	261	26,531	1,695	261	28,226	28,487	(5,136	)	2009	8/9/2011
312 Sentinel Way (O)	Annapolis Junction, MD	—	3,138	27,789	—	3,138	27,789	30,927	(913	)	2014	11/14/2003
3120 Fairview Park Drive (O)	Falls Church, VA	—	6,863	35,606	8,773	6,863	44,379	51,242	(7,229	)	2008	11/23/2010
314 Sentinel Way (O)	Annapolis Junction, MD	—	1,254	1,439	—	1,254	1,439	2,693	(249	)	2008	11/14/2003
316 Sentinel Way (O)	Annapolis Junction, MD	—	2,748	38,156	138	2,748	38,294	41,042	(3,570	)	2011	11/14/2003
318 Sentinel Way (O)	Annapolis Junction, MD	—	2,185	28,426	—	2,185	28,426	30,611	(6,981	)	2005	11/14/2003
320 Sentinel Way (O)	Annapolis Junction, MD	—	2,067	21,623	—	2,067	21,623	23,690	(4,310	)	2007	11/14/2003
322 Sentinel Way (O)	Annapolis Junction, MD	21,122	2,605	22,827	—	2,605	22,827	25,432	(5,143	)	2006	11/14/2003
324 Sentinel Way (O)	Annapolis Junction, MD	—	1,656	23,018	—	1,656	23,018	24,674	(3,078	)	2010	6/29/2006
410 National Business Parkway (O)	Annapolis Junction, MD	—	1,831	23,257	112	1,831	23,369	25,200	(1,719	)	2012	6/29/2006
420 National Business Parkway (O)	Annapolis Junction, MD	—	2,370	27,490	106	2,370	27,596	29,966	(1,230	)	2013	6/29/2006
430 National Business Parkway (O)	Annapolis Junction, MD	—	1,852	21,153	119	1,852	21,272	23,124	(2,034	)	2011	6/29/2006
44408 Pecan Court (O)	California, MD	—	817	1,583	581	817	2,164	2,981	(560	)	1986	3/24/2004
44414 Pecan Court (O)	California, MD	—	405	1,619	337	405	1,956	2,361	(725	)	1986	3/24/2004
44417 Pecan Court (O)	California, MD	—	434	3,348	88	434	3,436	3,870	(1,127	)	1989/2015	3/24/2004
44420 Pecan Court (O)	California, MD	—	344	890	148	344	1,038	1,382	(255	)	1989	11/9/2004
44425 Pecan Court (O)	California, MD	—	1,309	3,506	1,590	1,309	5,096	6,405	(1,784	)	1997	5/5/2004
45310 Abell House Lane (O)	California, MD	—	2,272	13,808	—	2,272	13,808	16,080	(1,403	)	2011	8/30/2010
46579 Expedition Drive (O)	Lexington Park, MD	—	1,406	5,796	1,335	1,406	7,131	8,537	(3,060	)	2002	3/24/2004
46591 Expedition Drive (O)	Lexington Park, MD	—	1,200	7,199	1,134	1,200	8,333	9,533	(1,933	)	2005	3/24/2004
4851 Stonecroft Boulevard (O)	Chantilly, VA	—	1,878	11,558	21	1,878	11,579	13,457	(3,248	)	2004	8/14/2002
4940 Campbell Drive (O) (10)	White Marsh, MD	—	1,379	2,728	1,464	1,379	4,192	5,571	(445	)	1990	1/9/2007
525 Babcock Road (O)	Colorado Springs, CO	—	355	397	79	355	476	831	(173	)	1967	7/12/2007
5325 Nottingham Drive (O)	White Marsh, MD	—	816	3,976	485	816	4,461	5,277	(1,233	)	2002	1/9/2007
5355 Nottingham Drive (O)	White Marsh, MD	—	761	3,562	1,758	761	5,320	6,081	(2,132	)	2005	1/9/2007
540 National Business Parkway (O)	Annapolis Junction, MD	—	2,035	9,496	—	2,035	9,496	11,531	—		(7)	6/29/2006
5520 Research Park Drive (O)	Catonsville, MD	—	—	20,072	201	—	20,273	20,273	(3,195	)	2009	4/4/2006
5522 Research Park Drive (O)	Catonsville, MD	—	—	4,550	—	—	4,550	4,550	(955	)	2007	3/8/2006
5825 University Research Court (O)	College Park, MD	15,255	—	22,740	87	—	22,827	22,827	(3,817	)	2008	1/29/2008
5850 University Research Court (O)	College Park, MD	20,771	—	31,906	406	—	32,312	32,312	(4,580	)	2008	1/29/2008
6700 Alexander Bell Drive (O)	Columbia, MD	—	1,755	7,019	6,226	1,755	13,245	15,000	(5,913	)	1988	5/14/2001
6708 Alexander Bell Drive (O)	Columbia, MD	—	897	8,844	1,591	897	10,435	11,332	(3,414	)	1988 (7)	5/14/2001

			Initial Cost			Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)	Land	Building and Land Improvements	Costs Capitalized Subsequent to Acquisition	Land	Building and Land Improvements	Total (3)(4)	Accumulated Depreciation (5)		Year Built or Renovated	Date Acquired (6)
6711 Columbia Gateway Drive (O)	Columbia, MD	—	2,683	23,239	619	2,683	23,858	26,541	(5,407	)	2006-2007	9/28/2000
6716 Alexander Bell Drive (O)	Columbia, MD	—	1,242	4,969	3,352	1,242	8,321	9,563	(4,359	)	1990	12/31/1998
6721 Columbia Gateway Drive (O)	Columbia, MD	16,663	1,753	34,090	76	1,753	34,166	35,919	(5,798	)	2009	9/28/2000
6724 Alexander Bell Drive (O)	Columbia, MD	—	449	5,039	708	449	5,747	6,196	(2,266	)	2001	5/14/2001
6731 Columbia Gateway Drive (O)	Columbia, MD	—	2,807	19,098	2,916	2,807	22,014	24,821	(8,494	)	2002	3/29/2000
6740 Alexander Bell Drive (O)	Columbia, MD	—	1,424	5,696	3,340	1,424	9,036	10,460	(5,058	)	1992	12/31/1998
6741 Columbia Gateway Drive (O)	Columbia, MD	—	675	1,711	124	675	1,835	2,510	(357	)	2008	9/28/2000
6750 Alexander Bell Drive (O)	Columbia, MD	—	1,263	12,461	3,457	1,263	15,918	17,181	(7,576	)	2001	12/31/1998
6760 Alexander Bell Drive (O)	Columbia, MD	—	890	3,561	2,974	890	6,535	7,425	(3,248	)	1991	12/31/1998
6940 Columbia Gateway Drive (O)	Columbia, MD	—	3,545	9,916	5,537	3,545	15,453	18,998	(7,000	)	1999	11/13/1998
6950 Columbia Gateway Drive (O)	Columbia, MD	—	3,596	14,269	3,087	3,596	17,356	20,952	(7,506	)	1998	10/22/1998
7000 Columbia Gateway Drive (O)	Columbia, MD	—	3,131	12,103	2,138	3,131	14,241	17,372	(4,482	)	1999	5/31/2002
7005 Columbia Gateway Drive (O)	Columbia, MD	—	3,036	189	—	3,036	189	3,225	—		(8)	6/26/2014
7015 Albert Einstein Drive (O)	Columbia, MD	1,570	2,058	6,093	1,527	2,058	7,620	9,678	(2,915	)	1999	12/1/2005
7061 Columbia Gateway Drive (O)	Columbia, MD	—	729	3,094	1,407	729	4,501	5,230	(1,802	)	2000	8/30/2001
7063 Columbia Gateway Drive (O)	Columbia, MD	—	902	3,684	2,512	902	6,196	7,098	(2,452	)	2000	8/30/2001
7065 Columbia Gateway Drive (O)	Columbia, MD	—	919	3,763	3,095	919	6,858	7,777	(2,773	)	2000	8/30/2001
7067 Columbia Gateway Drive (O)	Columbia, MD	—	1,829	11,823	2,838	1,829	14,661	16,490	(6,154	)	2001	8/30/2001
7125 Columbia Gateway Drive (L)	Columbia, MD	—	3,361	1,677	279	3,361	1,956	5,317	—		1973/1999 (8)	6/29/2006
7125 Columbia Gateway Drive (O)	Columbia, MD	—	17,126	46,994	9,813	17,126	56,807	73,933	(16,632	)	1973/1999	6/29/2006
7130 Columbia Gateway Drive (O)	Columbia, MD	—	1,350	4,359	1,906	1,350	6,265	7,615	(2,692	)	1989	9/19/2005
7134 Columbia Gateway Drive (O)	Columbia, MD	—	704	2,139	314	704	2,453	3,157	(1,234	)	1990 (7)	9/19/2005
7138 Columbia Gateway Drive (O)	Columbia, MD	—	1,104	3,518	2,118	1,104	5,636	6,740	(3,139	)	1990	9/19/2005
7142 Columbia Gateway Drive (O)	Columbia, MD	—	1,342	3,978	2,502	1,342	6,480	7,822	(2,322	)	1994	9/19/2005
7150 Columbia Gateway Drive (O)	Columbia, MD	—	1,032	3,429	665	1,032	4,094	5,126	(1,170	)	1991	9/19/2005
7150 Riverwood Drive (O)	Columbia, MD	—	1,821	4,388	1,713	1,821	6,101	7,922	(1,933	)	2000	1/10/2007
7160 Riverwood Drive (O)	Columbia, MD	—	2,732	7,006	2,275	2,732	9,281	12,013	(3,265	)	2000	1/10/2007
7170 Riverwood Drive (O)	Columbia, MD	—	1,283	3,096	692	1,283	3,788	5,071	(1,386	)	2000	1/10/2007
7175 Riverwood Drive (O)	Columbia, MD	—	1,788	7,269	—	1,788	7,269	9,057	(389	)	1996/2013	7/27/2005
7200 Redstone Gateway (O)	Huntsville, AL	6,649	—	8,347	—	—	8,347	8,347	(328	)	2013	3/23/2010
7200 Riverwood Road (O)	Columbia, MD	—	4,089	22,544	3,994	4,089	26,538	30,627	(8,761	)	1986	10/13/1998
7205 Riverwood Drive (O)	Columbia, MD	—	1,367	21,484	—	1,367	21,484	22,851	(1,310	)	2013	7/27/2005
7272 Park Circle Drive (O)	Hanover, MD	4,747	1,479	6,300	3,883	1,479	10,183	11,662	(2,956	)	1991/1996	1/10/2007
7318 Parkway Drive (O)	Hanover, MD	—	972	3,888	1,002	972	4,890	5,862	(2,084	)	1984	4/16/1999
7320 Parkway Drive (O)	Hanover, MD	—	905	3,570	5,048	905	8,618	9,523	(2,883	)	1983	4/4/2002
7400 Redstone Gateway (O)	Huntsville, AL	7,292	—	9,012	—	—	9,012	9,012	(121	)	2015	3/23/2010
7467 Ridge Road (O)	Hanover, MD	—	1,629	6,517	3,645	1,629	10,162	11,791	(4,439	)	1990	4/28/1999
7740 Milestone Parkway (O)	Hanover, MD	18,987	3,825	34,176	404	3,825	34,580	38,405	(4,692	)	2009	7/2/2007
7770 Backlick Road (O)	Springfield, VA	—	6,387	74,325	141	6,387	74,466	80,853	(5,292	)	2012	3/10/2010

			Initial Cost			Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)	Land	Building and Land Improvements	Costs Capitalized Subsequent to Acquisition	Land	Building and Land Improvements	Total (3)(4)	Accumulated Depreciation (5)		Year Built or Renovated	Date Acquired (6)
7880 Milestone Parkway (O)	Hanover, MD	—	4,857	23,647	—	4,857	23,647	28,504	(215	)	2015 (7)	9/17/2013
8003 Corporate Drive (O) (10)	White Marsh, MD	—	611	1,126	685	611	1,811	2,422	(99	)	1999	1/9/2007
8007 Corporate Drive (O) (10)	White Marsh, MD	—	1,434	350	1,218	1,434	1,568	3,002	(278	)	1995	1/9/2007
8010 Corporate Drive (O) (10)	White Marsh, MD	—	1,349	3,262	1,744	1,349	5,006	6,355	(1,448	)	1998	1/9/2007
8013 Corporate Drive (O) (10)	White Marsh, MD	—	642	1,072	1,808	642	2,880	3,522	(519	)	1990	1/9/2007
8015 Corporate Drive (O) (10)	White Marsh, MD	—	446	1,116	466	446	1,582	2,028	(468	)	1990	1/9/2007
8019 Corporate Drive (O) (10)	White Marsh, MD	—	680	1,898	825	680	2,723	3,403	(827	)	1990	1/9/2007
8020 Corporate Drive (O) (10)	White Marsh, MD	—	2,184	3,767	2,205	2,184	5,972	8,156	(1,703	)	1997	1/9/2007
8023 Corporate Drive (O) (10)	White Marsh, MD	—	651	1,164	5	651	1,169	1,820	(47	)	1990	1/9/2007
8094 Sandpiper Circle (O) (10)	White Marsh, MD	—	1,960	3,716	1,129	1,960	4,845	6,805	(1,267	)	1998	1/9/2007
8098 Sandpiper Circle (O) (10)	White Marsh, MD	—	1,797	3,651	639	1,797	4,290	6,087	(929	)	1998	1/9/2007
8110 Corporate Drive (O) (10)	White Marsh, MD	—	2,285	10,117	989	2,285	11,106	13,391	(3,133	)	2001	1/9/2007
8140 Corporate Drive (O) (10)	White Marsh, MD	—	2,158	8,457	3,163	2,158	11,620	13,778	(4,117	)	2003	1/9/2007
8621 Robert Fulton Drive (O)	Columbia, MD	—	2,317	12,642	344	2,317	12,986	15,303	(3,378	)	2005-2006	6/10/2005
8661 Robert Fulton Drive (O)	Columbia, MD	—	1,510	3,764	2,420	1,510	6,184	7,694	(2,117	)	2002	12/30/2003
8671 Robert Fulton Drive (O)	Columbia, MD	—	1,718	4,280	3,931	1,718	8,211	9,929	(3,060	)	2002	12/30/2003
870 Elkridge Landing Road (O)	Linthicum, MD	—	2,003	9,442	7,616	2,003	17,058	19,061	(8,411	)	1981	8/3/2001
891 Elkridge Landing Road (O)	Linthicum, MD	—	1,165	4,772	2,928	1,165	7,700	8,865	(3,488	)	1984	7/2/2001
900 Elkridge Landing Road (O)	Linthicum, MD	—	1,993	7,972	3,603	1,993	11,575	13,568	(6,009	)	1982	4/30/1998
901 Elkridge Landing Road (O)	Linthicum, MD	—	1,156	4,437	2,390	1,156	6,827	7,983	(3,015	)	1984	7/2/2001
911 Elkridge Landing Road (O)	Linthicum, MD	—	1,215	4,861	2,024	1,215	6,885	8,100	(3,462	)	1985	4/30/1998
921 Elkridge Landing Road (O)	Linthicum, MD	—	1,044	4,727	748	1,044	5,475	6,519	(4,924	)	1983 (7)	4/30/1998
938 Elkridge Landing Road (O)	Linthicum, MD	—	922	4,748	1,263	922	6,011	6,933	(2,116	)	1984	7/2/2001
939 Elkridge Landing Road (O)	Linthicum, MD	—	939	3,756	4,245	939	8,001	8,940	(3,337	)	1983	4/30/1998
940 Elkridge Landing Road (L)	Linthicum, MD	—	842	4	—	842	4	846	—		(8)	7/2/2001
9651 Hornbaker Road (D)	Manassas, VA	—	6,050	249,706	985	6,050	250,691	256,741	(18,119	)	2010	9/14/2010
Aerotech Commerce (L)	Colorado Springs, CO	—	900	—	—	900	—	900	—		(8)	5/19/2006
Arborcrest (O)	Blue Bell, PA	—	21,968	122,759	1,301	21,968	124,060	146,028	(25,901	)	1991-96/2015	10/14/1997
Arundel Preserve (L)	Hanover, MD	—	13,401	9,331	—	13,401	9,331	22,732	—		(8)	7/2/2007
Ashburn Crossing - DC10 (O)	Ashburn, VA	—	4,408	10,689	—	4,408	10,689	15,097	(225	)	2015	12/27/2012
Canton Crossing Land (L)	Baltimore, MD	—	16,085	2,134	—	16,085	2,134	18,219	—		(8)	10/27/2009
Canton Crossing Util Distr Ctr (O)	Baltimore, MD	—	7,300	15,556	942	7,300	16,498	23,798	(3,326	)	2006	10/27/2009
Columbia Gateway - Southridge (L)	Columbia, MD	—	6,387	3,539	—	6,387	3,539	9,926	—		(8)	9/20/2004
Dahlgren Technology Center (L)	Dahlgren, VA	—	978	178	—	978	178	1,156	—		(8)	3/16/2005
Expedition VII (L)	Lexington Park, MD	—	705	728	—	705	728	1,433	—		(8)	3/24/2004
InterQuest (L) (10)	Colorado Springs, CO	—	8,201	—	—	8,201	—	8,201	—		(8)	9/28/2005
M Square Research Park (L)	College Park, MD	—	—	2,986	—	—	2,986	2,986	—		(8)	1/29/2008
National Business Park North (L)	Annapolis Junction, MD	—	28,066	41,936	—	28,066	41,936	70,002	—		(8)	6/29/2006
North Gate Business Park (L)	Aberdeen, MD	—	6,309	4,540	—	6,309	4,540	10,849	—		(8)	9/14/2007

				Initial Cost						Gross Amounts Carried At Close of Period
Property (Type) (1)	Location	Encumbrances (2)		Land		Building and Land Improvements		Costs Capitalized Subsequent to Acquisition		Land		Building and Land Improvements		Total (3)(4)		Accumulated Depreciation (5)			Year Built or Renovated	Date Acquired (6)
Northwest Crossroads (L)	San Antonio, TX	—		7,430		847		—		7,430		847		8,277		—			(8)	1/20/2006
NOVA Office A (O) (9)	Chantilly, VA	—		2,096		47,364		—		2,096		47,364		49,460		(1,046		)	2015	7/31/2002
NOVA Office B (O) (9)	Chantilly, VA	—		739		26,277		—		739		26,277		27,016		—			(7)	7/31/2002
NOVA Office D (O)	Chantilly, VA	—		6,587		103		—		6,587		103		6,690		—			(7)	7/31/2002
Old Annapolis Road (O)	Columbia, MD	—		1,637		5,500		3,457		1,637		8,957		10,594		(2,983		)	1974/1985	12/14/2000
Patriot Park (L)	Colorado Springs, CO	—		2,328		1		—		2,328		1		2,329		—			(8)	7/8/2005
Patriot Point - DC15 (O)	Ashburn, VA	—		12,156		7,112		—		12,156		7,112		19,268		—			(7)	10/15/2015
Patriot Point - DC16 (O)	Ashburn, VA	—		12,156		4,110		—		12,156		4,110		16,266		—			(7)	10/15/2015
Patriot Point - DC17 (O)	Ashburn, VA	—		6,078		472		—		6,078		472		6,550		—			(7)	10/15/2015
Patriot Ridge (L)	Springfield, VA	—		18,517		14,423		—		18,517		14,423		32,940		—			(8)	3/10/2010
Redstone Gateway (L)	Huntsville, AL	—		—		14,250		—		—		14,250		14,250		—			(8)	3/23/2010
Route 15/Biggs Ford Road (L)	Frederick, MD	—		8,703		596		—		8,703		596		9,299		—			(8)	8/28/2008
Sentry Gateway (L)	San Antonio, TX	—		8,275		3,645		—		8,275		3,645		11,920		—			(8)	3/30/2005
Sentry Gateway - T (O)	San Antonio, TX	—		14,020		38,804		13		14,020		38,817		52,837		(8,618		)	1982/1985	3/30/2005
Sentry Gateway - V (O)	San Antonio, TX	—		—		1,066		—		—		1,066		1,066		(188		)	2007	3/30/2005
Sentry Gateway - W (O)	San Antonio, TX	—		—		1,884		—		—		1,884		1,884		(296		)	2009	3/30/2005
Sentry Gateway - X (O)	San Antonio, TX	—		1,964		21,178		—		1,964		21,178		23,142		(2,728		)	2010	1/20/2006
Sentry Gateway - Y (O)	San Antonio, TX	—		1,964		21,298		—		1,964		21,298		23,262		(2,745		)	2010	1/20/2006
Sentry Gateway - Z (O)	San Antonio, TX	—		1,964		30,335		—		1,964		30,335		32,299		(616		)	2015	6/14/2005
Southpoint Manassas - DC12 (O)	Manassas, VA	—		4,518		12,701		—		4,518		12,701		17,219		(127		)	2015	2/6/2015
Southpoint Manassas - DC14 (O)	Manassas, VA	—		4,518		13,009		—		4,518		13,009		17,527		(101		)	2015	2/6/2015
Westfields - Park Center (L)	Chantilly, VA	—		16,418		7,488		—		16,418		7,488		23,906		—			(8)	7/18/2002
Westfields Corporate Center (L)	Chantilly, VA	—		7,141		1,423		—		7,141		1,423		8,564		—			(8)	7/31/2002
White Marsh (L)	White Marsh, MD	—		7,852		2,570		—		7,852		2,570		10,422		—			(8)	1/9/2007
Woodland Park (L) (10)	Herndon, VA	—		9,614		85		—		9,614		85		9,699		—			(8)	4/29/2004
Other Developments, including intercompany eliminations (V)	Various	—		94		34		431		94		465		559		(39		)	Various	Various
		$	316,887	$	709,953	$	3,106,271	$	342,392	$	709,953	$	3,448,663	$	4,158,616	$	(718,680	)

(1) A legend for the Property Type follows: (O) = Office Property; (L) = Land held or pre-construction; (D) = Data Center; and (V) = Various.

(2) Excludes our Revolving Credit Facility of $43.5 million, term loan facilities of $515.9 million, unsecured senior notes of $1.2 billion, unsecured notes payable of $1.5 million, a letter of credit on a mortgage loan of $14.8 million, and deferred financing costs, net of premiums, on the remaining loans of $668,000.

(3) The aggregate cost of these assets for Federal income tax purposes was approximately $3.5 billion at December 31, 2015.

(4) As discussed in Note 3 to our Consolidated Financial Statements, we recognized impairment losses of $23.5 millionprimarily in connection with certain of our land and operating properties, including $22.0 million related to land and operating properties still owned as of December 31, 2015.

(5) The estimated lives over which depreciation is recognized follow: Building and land improvements: 10-40 years; and tenant improvements: related lease terms.

(6) The acquisition date of multi-parcel properties reflects the date of the earliest parcel acquisition.

(7) Under construction or redevelopment at December 31, 2015.

(8) Held or under pre-construction at December 31, 2015.

(9) The carrying amounts of these properties under construction exclude allocated costs of the garage being constructed to support the properties.

(10) Classified as held for sale as of December 31, 2015.

The following table summarizes our changes in cost of properties for the years ended December 31, 2015, 2014 and 2013 (in thousands):
		2015			2014			2013
	Beginning balance	$	4,014,336		$	3,811,950		$	3,859,960
	Acquisitions of operating properties	194,616			—			—
	Improvements and other additions	273,761			254,868			249,639
	Sales	(172,628		)	(48,466		)	(141,045		)
	Impairments	(29,548		)	(3,042		)	(45,931		)
	Other dispositions	(121,921		)	(974		)	(110,673		)
	Ending balance	$	4,158,616		$	4,014,336		$	3,811,950
The following table summarizes our changes in accumulated depreciation for the same time periods (in thousands):
		2015			2014			2013
	Beginning balance	$	703,083		$	597,649		$	568,176
	Depreciation expense	112,695			111,326			92,677
	Sales	(49,614		)	(3,129		)	(9,542		)
	Impairments	(6,092		)	(1,671		)	(14,863		)
	Other dispositions	(41,392		)	(1,092		)	(38,799		)
	Ending balance	$	718,680		$	703,083		$	597,649

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The COPT consolidated financial statements include the accounts of COPT, the Operating Partnership, their subsidiaries and other entities in which COPT has a majority voting interest and control.  The COPLP consolidated financial statements include the accounts of COPLP, its subsidiaries and other entities in which COPLP has a majority voting interest and control.  We also consolidate certain entities when control of such entities can be achieved through means other than voting rights (“variable interest entities” or “VIEs”) if we are deemed to be the primary beneficiary of such entities.  We eliminate all intercompany balances and transactions in consolidation.

We use the equity method of accounting when we own an interest in an entity and can exert significant influence over but cannot control the entity’s operations. We discontinue equity method accounting if our investment in an entity (and net advances) is reduced to zero unless we have guaranteed obligations of the entity or are otherwise committed to provide further financial support for the entity.

We use the cost method of accounting when we own an interest in an entity and cannot exert significant influence over its operations.

Reclassification

Reclassification

We reclassified certain amounts from prior periods to conform to the current period presentation of our consolidated financial statements, including amounts related to our adoption of guidance regarding the presentation of deferred debt issuance costs (discussed below) and our change in reportable segments (discussed in Note 17), with no effect on previously reported net income or equity.

Use of Estimates in the Preparation of Financial Statements

Use of Estimates in the Preparation of Financial Statements

We make estimates and assumptions when preparing financial statements under generally accepted accounting principles (“GAAP”). These estimates and assumptions affect various matters, including:

• the reported amounts of assets and liabilities in our consolidated balance sheets at the dates of the financial statements;

• the disclosure of contingent assets and liabilities at the dates of the financial statements; and

• the reported amounts of revenues and expenses in our consolidated statements of operations during the reporting periods.

Significant estimates are inherent in the presentation of our financial statements in a number of areas, including the evaluation of the collectability of accounts and deferred rent receivable, the allocation of property acquisition costs, the determination of estimated useful lives of assets, the determination of lease terms, the evaluation of impairment of long-lived assets, the amount of impairment losses recognized, the amount of revenue recognized relating to tenant improvements, the level of expense recognized in connection with share-based compensation and the determination of accounting method for investments. Actual results could differ from these and other estimates.

Acquisitions of Properties

Acquisitions of Properties

Upon completion of property acquisitions, we allocate the purchase price to tangible and intangible assets and liabilities associated with such acquisitions based on our estimates of their fair values. We determine these fair values by using market data and independent appraisals available to us and making numerous estimates and assumptions. We allocate property acquisitions to the following components:

• properties based on a valuation performed under the assumption that the property is vacant upon acquisition (the “if-vacant value”). The if-vacant value is allocated between land and buildings or, in the case of properties under development, construction in progress. We also allocate additional amounts to properties for in-place tenant improvements based on our estimate of improvements per square foot provided under market leases that would be attributable to the remaining non-cancelable terms of the respective leases;

• above- and below-market lease intangible assets or liabilities based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between: (1) the contractual amounts to be received pursuant to the in-place leases; and (2) our estimate of fair market lease rates for the corresponding space, measured over a period equal to the remaining non-cancelable term of the lease. The capitalized above- and below-market lease values are amortized as adjustments to rental revenue over the remaining lease terms of the respective leases, and to renewal periods in the case of below-market leases;

• in-place lease value based on our estimates of: (1) the present value of additional income to be realized as a result of leases being in place on the acquired properties; and (2) costs to execute similar leases. Our estimate of additional income to be realized includes carrying costs, such as real estate taxes, insurance and other operating expenses, and revenues during the expected lease-up periods considering current market conditions. Our estimate of costs to execute similar leases includes leasing commissions, legal and other related costs;

• tenant relationship value based on our evaluation of the specific characteristics of each tenant's lease and our overall relationship with that respective tenant. Characteristics we consider in determining these values include the nature and extent of our existing business relationships with the tenant, growth prospects for developing new business with the tenant, the tenant's credit quality and expectations of lease renewals, among other factors; and

• above- and below- market cost arrangements (such as real estate tax treaties or above- or below- market ground leases) based on the present value of the expected benefit from any such arrangements in place on the property at the time of acquisition.

Intangible Assets and Deferred Revenue on Real Estate Acquisitions

Intangible Assets and Deferred Revenue on Real Estate Acquisitions

We amortize the intangible assets and deferred revenue on real estate acquisitions discussed above as follows:

Asset Type	Amortization Period
Above- and below-market leases	Related lease terms
In-place lease value	Related lease terms
Tenant relationship value	Estimated period of time that tenant will lease space in property
Above- and below-market cost arrangements	Term of arrangements

We recognize the amortization of acquired above-market and below-market leases as adjustments to rental revenue. We recognize the amortization of above- and below- market cost arrangements as adjustments to property operating expenses. We recognize the amortization of other intangible assets on property acquisitions as amortization expense.

Properties

Properties

We report properties to be developed or held and used in operations at our depreciated cost, reduced for impairment losses. The preconstruction stage of the development or redevelopment of an operating property includes efforts and related costs to secure land control and zoning, evaluate feasibility and complete other initial tasks which are essential to development.

We capitalize interest expense, real estate taxes and direct and indirect project costs (including related compensation and other indirect costs) associated with properties, or portions thereof, undergoing construction, development and redevelopment activities. In capitalizing interest expense, if there is a specific borrowing for the property undergoing construction, development and redevelopment activities, we apply the interest rate of that borrowing to the average accumulated expenditures that do not exceed such borrowing; for the portion of expenditures exceeding any such specific borrowing, we apply our weighted average interest rate on other borrowings to the expenditures. We continue to capitalize costs while construction, development or redevelopment activities are underway until a property becomes “operational,” which occurs when lease terms commence (generally when the tenant has control of the leased space and we have delivered the premises to the tenant as required under the terms of such lease), but no later than one year after the cessation of major construction activities. When leases commence on portions of a newly-constructed or redeveloped property in the period prior to one year from the cessation of major construction activities, we consider that property to be “partially operational.” When a property is partially operational, we allocate the costs associated with the property between the portion that is operational and the portion under construction. We start depreciating newly-constructed and redeveloped properties as they become operational.

Most of our leases involve some form of improvements to leased space. When we are required to provide improvements under the terms of a lease, we determine whether the improvements constitute landlord assets or tenant assets. If the improvements are landlord assets, we capitalize the cost of the improvements and recognize depreciation expense associated with such improvements over the shorter of the useful life of the assets or the term of the lease and recognize any payments from the tenant as rental revenue over the term of the lease. If the improvements are tenant assets, we defer the cost of improvements funded by us as a lease incentive asset and amortize it as a reduction of rental revenue over the term of the lease. In determining whether improvements constitute landlord or tenant assets, we consider numerous factors, including: whether the improvements are unique to the tenant or reusable by other tenants; whether the tenant is permitted to alter or remove the improvements without our consent or without compensating us for any lost fair value; whether the ownership of the improvements remains with us or remains with the tenant at the end of the lease term; and whether the economic substance of the lease terms is properly reflected.

We depreciate our fixed assets using the straight-line method over their estimated useful lives as follows:

	Estimated Useful Lives
Buildings and building improvements	10-40 years
Land improvements	10-20 years
Tenant improvements on operating properties	Related lease term
Equipment and personal property	3-10 years

We assess each of our operating properties for impairment quarterly using cash flow projections and estimated fair values that we derive for each of the properties.  We update the leasing and other assumptions used in these projections regularly, paying particular attention to properties that have experienced chronic vacancy or face significant market challenges.  We review our plans and intentions for our development projects and land parcels quarterly.  If our analyses indicate that the carrying values of operating properties, properties in development or land held for future development may be impaired, we perform a recovery analysis for such properties.  For long-lived assets to be held and used, we analyze recoverability based on the estimated undiscounted future cash flows expected to be generated from the operations and eventual disposition of the assets over, in most cases, a ten-year holding period.  If we believe there is a significant possibility that we might dispose of the assets earlier, we analyze recoverability using a probability weighted analysis of the estimated undiscounted future cash flows expected to be generated from the operations and eventual disposition of the assets over the various possible holding periods.  If the recovery analysis indicates that the carrying value of a tested property is not recoverable from estimated future cash flows, it is written down to its estimated fair value and an impairment loss is recognized.  If and when our plans change, we revise our recoverability analyses to use the cash flows expected from the operations and eventual disposition of each asset using holding periods that are consistent with our revised plans. Changes in holding periods may require us to recognize significant impairment losses. 

Fair values are estimated based on contract prices, indicative bids, discounted cash flow analyses, yield analyses or sales comparison approach. Estimated cash flows used in such analyses are based on our plans for the property and our views of market and economic conditions. The estimates consider factors such as current and future rental rates, occupancies for the tested property and comparable properties, estimated operating and capital expenditures and recent sales data for comparable properties; most of these factors are influenced by market data obtained from real estate leasing and brokerage firms and our direct experience with the properties and their markets.

When we determine that a property is held for sale, we stop depreciating the property and estimate the property’s fair value, net of selling costs; if we then determine that the estimated fair value, net of selling costs, is less than the net book value of the property, we recognize an impairment loss equal to the difference and reduce the net book value of the property. For periods in which a property is classified as held for sale, we classify the assets of the property as held for sale on our consolidated balance sheet for such periods.

For dispositions of operating properties occurring prior to June 30, 2014 in which we had no significant continuing involvement, or for operating properties held for sale prior to June 30, 2014, we classify the results of operations for such properties as discontinued operations; interest expense that is specifically identifiable to properties included in discontinued operations is used in the computation of interest expense attributable to discontinued operations. We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) related to the reporting of discontinued operations and disclosures of disposals of components of an entity effective for the quarterly period ended June 30, 2014. This guidance defines a discontinued operation as a component or group of components disposed or classified as held for sale that represents a strategic shift that has (or will have) a major effect on an entity’s operations and financial results; the guidance states that a strategic shift could include a disposal of a major geographical area of operations, a major line of business, a major equity method investment or other major parts of an entity. We have had no properties newly classified as discontinued operations subsequent to our adoption of this guidance.

Sale of Interests in Real Estate

Sales of Interests in Real Estate

We recognize gains from sales of interests in real estate using the full accrual method, provided that various criteria relating to the terms of sale and any subsequent involvement by us with the real estate sold are met.

Cash and Cash Equivalents

Cash and Cash Equivalents

Cash and cash equivalents include all cash and liquid investments that mature three months or less from when they are purchased. Cash equivalents are reported at cost, which approximates fair value. We maintain our cash in bank accounts in amounts that may exceed Federally insured limits at times. We have not experienced any losses in these accounts in the past and believe that we are not exposed to significant credit risk because our accounts are deposited with major financial institutions.

Investments in Marketable Securities

Investments in Marketable Securities

We classify marketable securities as trading securities when we have the intent to sell such securities in the near term, and classify other marketable securities as available-for-sale securities. We determine the appropriate classification of investments in marketable securities at the acquisition date and re-evaluate the classification at each balance sheet date. We report investments in marketable securities classified as trading securities at fair value, with unrealized gains and losses recognized through earnings; on our consolidated statements of cash flows, we classify cash flows from these securities as operating activities.

Accounts and Deferred Rents Receivable and Investing Receivables

Accounts and Deferred Rents Receivable and Investing Receivables

We maintain allowances for estimated losses resulting from the failure of our customers or borrowers to satisfy their payment obligations. We use judgment in estimating these allowances based primarily upon the payment history and credit status of the entities associated with the individual receivables. We write off these receivables when we believe the facts and circumstances indicate that continued pursuit of collection is no longer warranted. When cash is received in connection with receivables for which we have established allowances, we reduce the amount of losses previously recognized.

We evaluate the collectibility of both interest and principal of loans whenever events or changes in circumstances indicate such amounts may not be recoverable. A loan is impaired when it is probable that we will be unable to collect all amounts due according to the existing contractual terms.  When a loan is impaired, the amount of the loss accrual is calculated by comparing the carrying amount of the investment to the present value of expected future cash flows discounted at the loan’s effective interest rate and the value of any collateral under such loan.

Interest on impaired loans is recognized when received in cash.

Deferred Leasing and Financing Costs, Net

Deferred Leasing and Financing Costs

We defer costs incurred to obtain new tenant leases or extend existing tenant leases, including related compensation costs. We amortize these costs evenly over the lease terms. When tenant leases are terminated early, we expense any unamortized deferred leasing costs associated with those leases over the shortened term of the lease.

We defer costs of financing arrangements and recognize these costs as interest expense over the related loan terms on a straight-line basis, which approximates the amortization that would occur under the effective interest method of amortization. We expense any unamortized loan costs when loans are retired early.

In April 2015, the FASB issued guidance that changes the presentation of deferred debt issuance costs in financial statements. This guidance requires an entity to present such costs in the balance sheet as a direct deduction from the related debt liability rather than as an asset. This guidance was further updated in August 2015 with respect to debt issuance costs of line-of-credit arrangements to note that it will be permissible for an entity to defer and present debt issuance costs as an asset and subsequently amortize the deferred debt issuance costs ratably over the term of a line-of-credit arrangement, regardless of whether there are any outstanding borrowings on the line-of-credit arrangement. We adopted this guidance effective for the quarterly period ended December 31, 2015 retrospectively to each prior period presented. The application of this guidance changed the balance sheet classification of most of our deferred financing costs but did not otherwise affect our consolidated financial statements. For costs of such arrangements attributable to line-of-credit arrangements and interest rate derivatives, we present such costs in the balance sheet in the line entitled prepaid and other assets.

Noncontrolling Interests

Noncontrolling Interests

COPT’s consolidated noncontrolling interests are comprised of interests in COPLP not owned by COPT (discussed further in Note 14) and consolidated real estate joint ventures (discussed further in Note 6). COPLP’s consolidated noncontrolling interests are comprised primarily of interests in our consolidated real estate joint ventures. Also included in COPLP’s consolidated noncontrolling interests are interests in several real estate entities owned directly by COPT, or a wholly owned subsidiary of COPT, that generally do not exceed 1% of interests in such entities. We evaluate whether noncontrolling interests are subject to redemption features outside of our control. For noncontrolling interests that are currently redeemable for cash at the option of the holders of such interests or deemed probable to eventually become redeemable, we classify such interests as redeemable noncontrolling interests in the mezzanine section of our consolidated balance sheets; we adjust these interests each period to the greater of their fair value or carrying amount (initial amount as adjusted for allocations of income and losses and contributions and distributions), with a corresponding offset to additional paid-in capital on COPT’s consolidated balance sheets or common units on COPLP’s balance sheet, and only recognize reductions in such interests to the extent of their carrying amount. Our other noncontrolling interests are reported in the equity section of our consolidated balance sheets. The amounts reported for noncontrolling interests on our consolidated statements of operations represent the portion of these entities’ income or losses not attributable to us.

Revenue Recognition

Revenue Recognition

We recognize minimum rents, net of abatements, on a straight-line basis over the term of tenant leases. A lease term generally commences when: (1) the tenant has control of the leased space (legal right to use the property); and (2) we have delivered the premises to the tenant as required under the terms of such lease. The term of a lease generally includes periods when a tenant: (1) may not terminate its lease obligation early; (2) may terminate its lease obligation early in exchange for a fee or penalty that we consider material enough such that termination would not be probable; (3) possesses renewal rights and the tenant’s failure to exercise such rights imposes a penalty on the tenant material enough such that renewal appears reasonably assured; or (4) possesses bargain renewal options for such periods. We report the amount by which our minimum rental revenue recognized on a straight-line basis under leases exceeds the contractual rent billings associated with such leases as deferred rent receivable on our consolidated balance sheets. Amounts by which our minimum rental revenue recognized on a straight-line basis under leases are less than the contractual rent billings associated with such leases are included in deferred revenue associated with operating leases on our consolidated balance sheets.

In connection with a tenant’s entry into, or modification of, a lease, if we make cash payments to, or on behalf of, the tenant for purposes other than funding the construction of landlord assets, we defer the amount of such payments as lease incentives. As discussed above, when we are required to provide improvements under the terms of a lease, we determine whether the improvements constitute landlord assets or tenant assets; if the improvements are tenant assets, we defer the cost of improvements funded by us as a lease incentive asset. We amortize lease incentives as a reduction of rental revenue over the term of the lease.

We recognize tenant recovery revenue in the same periods in which we incur the related expenses. Tenant recovery revenue includes payments from tenants as reimbursement for property taxes, utilities and other property operating expenses.

We recognize fees received for lease terminations as revenue and write off against such revenue any (1) deferred rents receivable, and (2) deferred revenue, lease incentives and intangible assets that are amortizable into rental revenue associated with the leases; the resulting net amount is the net revenue from the early termination of the leases. When a tenant's lease for space in a property is terminated early but the tenant continues to lease such space under a new or modified lease in the property, the net revenue from the early termination of the lease is recognized evenly over the remaining life of the new or modified lease in place on that property.

We recognize fees for services provided by us once services are rendered, fees are determinable and collectability is assured. We recognize revenue under construction contracts using the percentage of completion method when the revenue and costs for such contracts can be estimated with reasonable accuracy; when these criteria do not apply to a contract, we recognize revenue on that contract using the completed contract method. Under the percentage of completion method, we recognize a percentage of the total estimated revenue on a contract based on the cost of services provided on the contract as of a point in time relative to the total estimated costs on the contract.

Interest Rate Derivatives

Interest Rate Derivatives

Our primary objectives in using interest rate derivatives are to add stability to interest expense and to manage exposure to interest rate movements. To accomplish this objective, we primarily use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for our making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount.  Derivatives are used to hedge the cash flows associated with interest rates on existing debt as well as future debt. We recognize all derivatives as assets or liabilities on our consolidated balance sheet at fair value. We defer the effective portion of changes in fair value of the designated cash flow hedges to AOCI and reclassify such deferrals to interest expense as interest expense is recognized on the hedged forecasted transactions. We recognize the ineffective portion of the change in fair value of interest rate derivatives directly in interest expense. When an interest rate swap designated as a cash flow hedge no longer qualifies for hedge accounting, we recognize changes in fair value of the hedge previously deferred to AOCI, along with any changes in fair value occurring thereafter, through earnings. We do not use interest rate derivatives for trading or speculative purposes. We manage counter-party risk by only entering into contracts with major financial institutions based upon their credit ratings and other risk factors.

We use standard market conventions and techniques such as discounted cash flow analysis, option pricing models, replacement cost and termination cost in computing the fair value of derivatives at each balance sheet date. We made an accounting policy election to use an exception provided for in the applicable accounting guidance with respect to measuring counterparty credit risk for derivative instruments; this election enables us to measure the fair value of groups of assets and liabilities associated with derivative instruments consistently with how market participants would price the net risk exposure as of the measurement date.

Please refer to Note 11 for additional information pertaining to interest rate derivatives.

Expense Classification

Expense Classification

We classify as property operations expense costs incurred for property taxes, ground rents, utilities, property management, insurance, repairs, exterior and interior maintenance and tenant revenue collection losses, as well as associated labor and indirect costs attributable to these costs.

We classify as general and administrative and leasing expenses costs incurred for corporate-level management, public company administration, asset management, leasing, investor relations, marketing and corporate-level insurance (including general business, director and officers and key man life) and leasing prospects, as well as associated labor and indirect costs attributable to these costs.

Share-Based Compensation

Share-Based Compensation

We issue three forms of share-based compensation: restricted COPT common shares (“restricted shares”), deferred share awards and performance share units (“PSUs”). We also issued options to purchase COPT common shares (“options”) in prior years. We account for share-based compensation in accordance with authoritative guidance provided by the FASB that establishes standards for the accounting for transactions in which an entity exchanges its equity instruments for goods or services, focusing primarily on accounting for transactions in which an entity obtains employee services in share-based payment transactions. The guidance requires us to measure the cost of employee services received in exchange for an award of equity instruments based generally on the fair value of the award on the grant date; such cost is then recognized over the period during which the employee is required to provide service in exchange for the award. No compensation cost is recognized for equity instruments for which employees do not render the requisite service. The guidance also requires that share-based compensation be computed based on awards that are ultimately expected to vest; as a result, future forfeitures of awards are estimated at the time of grant and revised, if necessary, in subsequent periods if actual forfeitures differ from those estimates. If an award is voluntarily cancelled by an employee, we recognize the previously unrecognized cost associated with the original award on the date of such cancellation. We capitalize costs associated with share-based compensation attributable to employees engaged in construction and development activities.

When we adopted the authoritative guidance on accounting for share-based compensation, we elected to adopt the alternative transition method for calculating the tax effects of share-based compensation. This method enabled us to use a simplified method to establishing the beginning balance of the additional paid-in capital pool related to the tax effects of employee share-based compensation that was available to absorb tax deficiencies recognized subsequent to the adoption of this guidance.

We compute the fair value of restricted shares and deferred share awards based on the fair value of COPT common shares on the grant date.

We compute the fair value of options using the Black-Scholes option-pricing model. Under that model, the risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. The expected option life is based on our historical experience of employee exercise behavior. Expected volatility is based on historical volatility of COPT common shares. Expected dividend yield is based on the average historical dividend yield on our common shares over a period of time ending on the grant date of the options.

We compute the fair value of PSUs using a Monte Carlo model. Under that model, the baseline common share value is based on the market value on the grant date. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant. Expected volatility is based on historical volatility of COPT’s common shares.

Income Taxes

Income Taxes

COPT elected to be treated as a REIT under Sections 856 through 860 of the Internal Revenue Code. To qualify as a REIT, COPT must meet a number of organizational and operational requirements, including a requirement that it distribute at least 90% of the Company’s adjusted taxable income to its shareholders. As a REIT, COPT generally will not be subject to Federal income tax on taxable income that it distributes to its shareholders. If COPT fails to qualify as a REIT in any tax year, it will be subject to Federal income tax on its taxable income at regular corporate rates and may not be able to qualify as a REIT for four subsequent tax years.

COPLP is a limited partnership and is not subject to federal income tax. Its partners are required to report their respective share of the Operating Partnership’s taxable income on their respective tax returns. COPT’s share of the Operating Partnership’s taxable income is reported on COPT’s income tax return.

For Federal income tax purposes, dividends to shareholders may be characterized as ordinary income, capital gains or return of capital. The characterization of dividends paid on COPT’s common and preferred shares during each of the last three years was as follows:

	Common Shares						Preferred Shares
	For the Years Ended December 31,						For the Years Ended December 31,
	2015		2014		2013		2015		2014		2013
Ordinary income	38.3	%	64.5	%	71.8	%	38.3	%	90.9	%	76.2	%
Long-term capital gain	61.7	%	6.5	%	22.4	%	61.7	%	9.1	%	23.8	%
Return of capital	0.0	%	29.0	%	5.8	%	0.0	%	0.0	%	0.0	%

In addition, dividends paid on January 15, 2016 (with a record date of December 31, 2015) on COPT’s common and preferred shares were allocated to 2015 for Federal income tax purposes and characterized based on the percentages set forth above for 2015.

We distributed all of COPT’s REIT taxable income in 2015, 2014 and 2013 and, as a result, did not incur Federal income tax in those years.

The net basis of our consolidated assets and liabilities for tax reporting purposes was approximately $224 million lower than the amount reported on our consolidated balance sheet at December 31, 2015, which was primarily related to differences in basis for net properties, intangible assets on property acquisitions and deferred rent receivable.

We are subject to certain state and local income and franchise taxes. The expense associated with these state and local taxes is included in general and administrative expense and property operating expenses on our consolidated statements of operations. We did not separately state these amounts on our consolidated statements of operations because they are insignificant.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In May 2014, the FASB issued guidance regarding the recognition of revenue from contracts with customers. Under this guidance, an entity will recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. Additionally, this guidance requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We are required to adopt this guidance for our annual and interim periods beginning January 1, 2018 using one of two methods: retrospective restatement for each reporting period presented at the time of adoption, or retrospectively with the cumulative effect of initially applying this guidance recognized at the date of initial application. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In January 2015, the FASB issued guidance regarding the presentation of extraordinary and unusual items in statements of operations. This guidance eliminates the concept of extraordinary items. However, the presentation and disclosure requirements for items that are either unusual in nature or infrequent in occurrence remain and will be expanded to include items that are both unusual in nature and infrequent in occurrence. This guidance is effective for periods beginning after December 15, 2015. We expect that the application of this guidance will have no effect on our reported consolidated financial statements.

In February 2015, the FASB issued guidance regarding amendments to the consolidation analysis. This guidance amends the criteria for determining which entities are considered variable interest entities (“VIE”), amends the criteria for determining if a service provider possesses a variable interest in a VIE and ends the deferral granted to investment companies for application of the VIE consolidation model. This guidance is effective for annual periods, and interim periods therein, beginning after December 15, 2015. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

As discussed further above, we adopted guidance issued by the FASB effective for the quarterly period ended December 31, 2015 retrospectively to each prior period presented that requires an entity to present deferred debt issuance costs (other than costs of line-of-credit arrangements) in the balance sheet as a direct deduction from the related debt liability rather than as an asset.

In September 2015, the FASB issued guidance that eliminates the requirement to restate prior period financial statements for measurement period adjustments following a business combination.  The guidance requires that the cumulative impact of a measurement period adjustment (including the impact on prior periods) be recognized in the reporting period in which the adjustment is identified. The prior period impact of the adjustment should be either presented separately on the face of the statement of operations or disclosed in the notes. This guidance is effective for annual reporting periods beginning after December 15, 2015.  This guidance will be applied prospectively for measurement period adjustments that occur after the effective date.  We expect that the application of this guidance will not materially affect our consolidated financial statements.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Accounting Policies [Abstract]

Schedule of amortization of intangible assets and deferred revenue

We amortize the intangible assets and deferred revenue on real estate acquisitions discussed above as follows:

Asset Type	Amortization Period
Above- and below-market leases	Related lease terms
In-place lease value	Related lease terms
Tenant relationship value	Estimated period of time that tenant will lease space in property
Above- and below-market cost arrangements	Term of arrangements

Schedule of the estimated useful lives of fixed assets

We depreciate our fixed assets using the straight-line method over their estimated useful lives as follows:

	Estimated Useful Lives
Buildings and building improvements	10-40 years
Land improvements	10-20 years
Tenant improvements on operating properties	Related lease term
Equipment and personal property	3-10 years

Schedule of characterization of dividends declared on common and preferred shares

The characterization of dividends paid on COPT’s common and preferred shares during each of the last three years was as follows:

	Common Shares						Preferred Shares
	For the Years Ended December 31,						For the Years Ended December 31,
	2015		2014		2013		2015		2014		2013
Ordinary income	38.3	%	64.5	%	71.8	%	38.3	%	90.9	%	76.2	%
Long-term capital gain	61.7	%	6.5	%	22.4	%	61.7	%	9.1	%	23.8	%
Return of capital	0.0	%	29.0	%	5.8	%	0.0	%	0.0	%	0.0	%

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Schedule of fair value assets and liabilities measured on recurring basis

The tables below set forth financial assets and liabilities of COPT and its subsidiaries that are accounted for at fair value on a recurring basis as of December 31, 2015 and 2014 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):

Description	Quoted Prices in Active Markets for Identical Assets(Level 1)		Significant Other Observable Inputs(Level 2)		Significant Unobservable Inputs(Level 3)		Total
December 31, 2015:
Assets:
Marketable securities in deferred compensation plan (1)
Mutual funds	$	5,658	$	—	$	—	$	5,658
Other	105		—		—		105
Interest rate derivatives (2)	—		53		—		53
Total assets	$	5,763	$	53	$	—	$	5,816
Liabilities:
Deferred compensation plan liability (3)	$	—	$	5,763	$	—	$	5,763
Interest rate derivatives	—		3,160		—		3,160
Total liabilities	$	—	$	8,923	$	—	$	8,923
December 31, 2014:
Assets:
Marketable securities in deferred compensation plan (1)
Mutual funds	$	5,756	$	—	$	—	$	5,756
Other	126		—		—		126
Interest rate derivatives (2)	—		274		—		274
Total assets	$	5,882	$	274	$	—	$	6,156
Liabilities:
Deferred compensation plan liability (3)	$	—	$	5,882	$	—	$	5,882
Interest rate derivatives	—		1,855		—		1,855
Total liabilities	$	—	$	7,737	$	—	$	7,737

(1) Included in the line entitled “restricted cash and marketable securities” on COPT’s consolidated balance sheet.

(2) Included in the line entitled “prepaid expenses and other assets” on COPT’s consolidated balance sheet.

(3) Included in the line entitled “other liabilities” on COPT’s consolidated balance sheet.

The tables below set forth financial assets and liabilities of COPLP and its subsidiaries that are accounted for at fair value on a recurring basis as of December 31, 2015 and 2014 and the hierarchy level of inputs used in measuring their respective fair values under applicable accounting standards (in thousands):

Description	Quoted Prices in Active Markets for Identical Assets(Level 1)		Significant Other Observable Inputs(Level 2)		Significant Unobservable Inputs(Level 3)		Total
December 31, 2015:
Assets:
Interest rate derivatives (1)	$	—	$	53	$	—	$	53
Total Assets	$	—	$	53	$	—	$	53
Liabilities:
Interest rate derivatives	$	—	$	3,160	$	—	$	3,160
December 31, 2014:
Assets:
Interest rate derivatives (1)	$	—	$	274	$	—	$	274
Total Assets	$	—	$	274	$	—	$	274
Liabilities:
Interest rate derivatives	$	—	$	1,855	$	—	$	1,855

(1) Included in the line entitled “prepaid expenses and other assets” on COPLP’s consolidated balance sheet.

Schedule of fair value hierarchy of impaired properties and other assets associated with such properties

The table below sets forth the fair value hierarchy of the valuation technique we used to determine nonrecurring fair measurements of assets as of December 31, 2015 (dollars in thousands):

	Fair Values as of December 31, 2015
	Quoted Prices in				Significant
	Active Markets for		Significant Other		Unobservable
	Identical Assets		Observable Inputs		Inputs
Description	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Total properties, net (1)	$	—	$	—	$	13,850	$	13,850
Assets held for sale, net (2)	—		—		21,423		21,423

(1) Represents estimated fair values.

(2) Represents estimated fair values less costs to sell.

Schedule of quantitative information about significant unobservable inputs used for Level 3 fair value measurements

The table below sets forth quantitative information about significant unobservable inputs used for the Level 3 fair value measurements reported above as of December 31, 2015 (dollars in thousands):

Valuation Technique	Fair Values on  Measurement Date		Unobservable Input	Range (Weighted Average) (1)
Bids for property indicative of value	$	24,423	Indicative bids	N/A
Comparable sales analysis	10,850		Comparable sales prices	N/A

(1) Only one value applied for these unobservable inputs.

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Properties, net (Tables)

12 Months Ended

Dec. 31, 2015

Real Estate [Abstract]

Schedule of operating properties, net

Operating properties, net consisted of the following (in thousands): 

	December 31,
	2015			2014
Land	$	463,305		$	439,355
Buildings and improvements	3,157,587			3,015,216
Less: accumulated depreciation	(700,363		)	(703,083		)
Operating properties, net	$	2,920,529		$	2,751,488

Schedule of projects in development or held for future development

Projects we had in development or held for future development consisted of the following (in thousands): 

	December 31,
	2015		2014
Land	$	207,774	$	214,977
Development in progress, excluding land	221,445		330,449
Projects in development or held for future development	$	429,219	$	545,426

Components of assets held for sale

The table below sets forth the components of assets held for sale on our consolidated balance sheet for these properties (in thousands):

	December 31, 2015
Properties, net	$	90,188
Deferred rent receivable	2,891
Intangible assets on real estate acquisitions, net	1,591
Deferred leasing costs, net	1,391
Lease incentives, net	721
Assets held for sale, net	$	96,782

Schedule of allocation of acquisition costs

The table below sets forth the allocation of the aggregate purchase price of these properties to the value of the acquired assets and liabilities (in thousands):

Land, operating properties	$	55,076
Building and improvements	139,540
Intangible assets on real estate acquisitions	75,729
Total assets	270,345
Below-market leases	(6,808		)
Total acquisition cost	$	263,537

Schedule of intangible assets recorded in connection with acquisition

Intangible assets recorded in connection with these acquisitions included the following (dollars in thousands):

			Weighted Average Amortization Period (in Years)
Tenant relationship value	$	31,183	12
In-place lease value	35,139		7
Above-market leases	6,720		4
Below-market cost arrangements	2,687		40
	$	75,729	10

Pro Forma information

The pro forma financial information was prepared for comparative purposes only and is not necessarily indicative of what would have occurred had these acquisitions been made at that time or of results which may occur in the future (in thousands, except per shares amounts).

	For the Year Ended December 31,
	2015		2014
	(Unaudited)
Pro forma total revenues	$	641,982	$	623,013
Pro forma net income attributable to COPT common shareholders	$	167,079	$	20,796
Pro forma EPS:
Basic	$	1.77	$	0.23
Diluted	$	1.77	$	0.23

Schedule of operating property dispositions

In 2014, we completed dispositions of the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Sale	Number of Buildings	Total Rentable Square Feet	Transaction Value		Gain on Disposition
4969 and 4979 Mercantile Road	White Marsh, MD	Regional Office	7/14/2014	2	96,721	$	5,960	$	2,124
9930 and 9940 Franklin Square	White Marsh, MD	Regional Office	7/30/2014	2	71,992	10,475		2,303
5020, 5022, 5024 and 5026 Campbell Boulevard	White Marsh, MD	Regional Office	8/4/2014	4	134,245	12,400		666
				8	302,958	$	28,835	$	5,093

 In 2013, we completed dispositions of the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Sale	Number of Buildings	Total Rentable Square Feet	Transaction Value (1)		Gain on Disposition
920 Elkridge Landing Road	Linthicum, MD	Fort Meade/BW Corridor	6/25/2013	1	103,000	$	6,900	$	—
4230 Forbes Boulevard	Lanham, MD	Regional Office	12/11/2013	1	56,000	5,600		1,507
December 2013 Colorado Springs Portfolio Disposition	Colorado Springs, CO	Colorado Defense/IT and Regional Office	12/12/2013	15	1,165,000	133,925		1,164
December 2013 Portfolio Conveyance	Colorado Springs, CO and Linthicum, MD	Various (2)	12/23/2013	14	1,021,000	146,876		—
				31	2,345,000	$	293,301	$	2,671

(1) Each of these properties were sold except for the December 2013 Portfolio Conveyance, the disposition of which was completed in connection with a debt extinguishment, as described further below.

In 2015, we completed dispositions of the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Disposition	Number of Buildings	Total Rentable Square Feet	Transaction Value (1)		Gain on Disposition
1550 Westbranch Drive	McLean, VA	Regional Office	7/27/2015	1	160,000	$	27,800	$	—
15000 and 15010 Conference Center Drive	Chantilly, VA	Northern VA Defense/IT	8/28/2015	2	665,000	167,335		—
13200 Woodland Park Road	Herndon, VA	Regional Office	10/27/2015	1	397,000	84,000		42,515
9900, 9910 and 9920 Franklin Square Drive	White Marsh, MD	Regional Office	11/9/2015	3	135,000	24,150		6,468
9690 Deereco Road and 375 W. Padonia Road	Timonium, MD	Regional Office	12/17/2015	2	240,000	44,500		15,050
				9	1,597,000	$	347,785	$	64,033

(1) Each of these properties were sold except for 15000 and 15010 Conference Center Drive, the disposition of which was completed in connection with a debt extinguishment, as discussed further below.

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Real Estate Joint Ventures (Tables)

12 Months Ended

Dec. 31, 2015

Equity Method Investments and Joint Ventures [Abstract]

Schedule of information related to investments in consolidated real estate joint ventures

The table below sets forth information pertaining to our investments in consolidated real estate joint ventures as of December 31, 2015 (dollars in thousands):

		Nominal
		Ownership		December 31, 2015				(1)
	Date	% as of		Total		Encumbered		Total
	Acquired	12/31/2015	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	147,612	$	82,721	$	54,022
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	56,455		48,245		37,568
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	5,284		—		393
				$	209,351	$	130,966	$	91,983

(1) Excludes amounts eliminated in consolidation.

(2) This joint venture’s property is in Huntsville, Alabama.

(3) This joint venture’s properties are in College Park, Maryland.

(4) This joint venture’s property is in Washington, DC.

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Intangible Assets on Real Estate Acquisitions (Tables)

12 Months Ended

Dec. 31, 2015

Intangible Assets on Real Estate Acquisitions

Schedule of intangible assets on real estate acquisitions

Intangible assets on real estate acquisitions consisted of the following (in thousands):

	December 31, 2015						December 31, 2014
	Gross Carrying Amount		Accumulated Amortization		Net  Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
In-place lease value	$	134,664	$	89,540	$	45,124	$	123,759	$	101,040	$	22,719
Tenant relationship value	62,172		23,468		38,704		42,301		28,492		13,809
Below-market cost arrangements	15,102		6,692		8,410		12,415		5,984		6,431
Above-market leases	14,210		8,491		5,719		8,659		8,159		500
Other	1,333		952		381		1,333		938		395
	$	227,481	$	129,143	$	98,338	$	188,467	$	144,613	$	43,854

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Investing Receivables (Tables)

12 Months Ended

Dec. 31, 2015

Receivables [Abstract]

Schedule of investing receivables

Investing receivables, including accrued interest thereon, consisted of the following (in thousands):

	December 31,
	2015		2014
Notes receivable from City of Huntsville	$	44,875	$	49,147
Other investing loans receivable	3,000		3,000
	$	47,875	$	52,147

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Prepaid Expenses and Other Assets, Net (Tables)

12 Months Ended

Dec. 31, 2015

Prepaid Expense and Other Assets [Abstract]

Schedule of prepaid expenses and other assets

Prepaid expenses and other assets, net consisted of the following (in thousands):

	December 31,
	2015		2014
Prepaid expenses	$	23,009	$	20,570
Lease incentives	11,133		13,344
Furniture, fixtures and equipment, net	6,004		6,637
Deferred financing costs, net (1)	5,867		4,849
Deferred tax asset, net	3,467		4,002
Construction contract costs incurred in excess of billings	3,261		6,656
Equity method investments	1,636		2,368
Other assets	5,647		2,875
Prepaid expenses and other assets, net	$	60,024	$	61,301

(1) Represents deferred costs, net of accumulated amortization, attributable to our Revolving Credit Facility and interest rate derivatives.

Schedule of tax effects of temporary differences and carry forwards in net deferred tax assets

Deferred tax asset, net reported above includes the following tax effects of temporary differences and carry forwards of our TRS (in thousands):

	December 31,
	2015			2014
Operating loss carry forward	$	5,065		$	5,012
Share-based compensation	363			976
Accrued payroll	133			195
Property	(32		)	(119		)
Valuation allowance	(2,062		)	(2,062		)
Deferred tax asset, net	$	3,467		$	4,002

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Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Schedule of debt

Our debt consisted of the following (dollars in thousands):

	Carrying Value (1) as of
	December 31, 2015		December 31, 2014		Stated Interest Rates as of	Scheduled Maturity as of
					December 31, 2015	December 31, 2015
Mortgage and Other Secured Loans:
Fixed rate mortgage loans (2)	$	281,208	$	385,769	3.96% - 7.87% (3)	2016-2024
Variable rate secured loans	49,792		36,698		LIBOR + 1.85% - 2.00% (4)	2016-2020
Total mortgage and other secured loans	331,000		422,467
Revolving Credit Facility (5)	43,500		83,000		LIBOR + 0.875% to 1.60%	May 2019
Term Loan Facilities (6)	515,902		517,846		LIBOR + 0.90% to 2.60% (7)	2019-2022
Unsecured Senior Notes (5)
3.600%, $350,000 aggregate principal	346,714		346,311		3.60% (8)	May 2023
5.250%, $250,000 aggregate principal	245,731		245,306		5.25% (9)	February 2024
3.700%, $300,000 aggregate principal	297,378		296,927		3.70% (10)	June 2021
5.000%, $300,000 aggregate principal	296,019		—		5.00% (10)	July 2025
Unsecured notes payable	1,508		1,607		0% (11)	2026
4.25% Exchangeable Senior Notes (12)	—		572		N/A	N/A
Total debt	$	2,077,752	$	1,914,036

(1) The carrying values of our loans other than the Revolving Credit Facility reflect net deferred financing costs of $8.0 million as of December 31, 2015 and $6.0 million as of December 31, 2014.

(2)   Several of the fixed rate mortgages carry interest rates that were above or below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates.  The carrying values of these loans reflect net unamortized premiums totaling $514,000 as of December 31, 2015 and $42,000 as of December 31, 2014.

(3) The weighted average interest rate on our fixed rate mortgage loans was 6.08% as of December 31, 2015.

(4)  The weighted average interest rate on our variable rate secured loans was 2.2% as of December 31, 2015.

(5) Refer to the paragraphs below for further disclosure.

(6)   As discussed below, an additional $150.0 million in borrowings is available to be drawn under a term loan entered into in the current year. In addition, we have the ability to borrow an additional $430.0 million in the aggregate under these term loan facilities, provided that there is no default under the facilities and subject to the approval of the lenders.

(7)  The weighted average interest rate on these loans was 1.92% as of December 31, 2015.

(8)   The carrying value of these notes reflects an unamortized discount totaling $2.2 million as of December 31, 2015 and $2.5 million as of December 31, 2014. The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%.

(9)   The carrying value of these notes reflects an unamortized discount totaling $3.8 million as of December 31, 2015 and $4.2 million as of December 31, 2014. The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%.

(10) Refer to the paragraphs below for further disclosure.

(11)  These notes carry interest rates that were below market rates upon assumption and therefore were recorded at their fair value based on applicable effective interest rates.  The carrying value of these notes reflects an unamortized discount totaling $554,000 as of December 31, 2015 and $654,000 as of December 31, 2014.

(12) On April 20, 2015, we redeemed the remaining $575,000 principal amount of these notes at 100% of their principal amount. The carrying value of these notes as of December 31, 2014 included an unamortized discount totaling $3,000.

Schedule of debt maturities

Our debt matures on the following schedule (in thousands):

2016	$	208,109
2017	3,252
2018	3,400
2019	167,014		(1)
2020	315,252
Thereafter	1,400,203
Total	$	2,097,230	(2)

(1)    Includes $43.5 million in 2019 that may be extended to 2020 at our option, subject to certain conditions.

(2)     Represents scheduled principal amortization and maturities only and therefore excludes net discounts and deferred financing costs of $19.5 million.

Schedule of the fair value of debt

The following table sets forth information pertaining to the fair value of our debt (in thousands):

	December 31, 2015				December 31, 2014
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Fixed-rate debt
Unsecured Senior Notes	$	1,185,842	$	1,211,658	$	888,544	$	901,599
Other fixed-rate debt	282,716		291,991		387,948		356,377
Variable-rate debt	609,194		610,987		637,544		642,091
	$	2,077,752	$	2,114,636	$	1,914,036	$	1,900,067

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Interest Rate Derivatives (Tables)

12 Months Ended

Dec. 31, 2015

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of key terms and fair values of interest rate swap derivatives

The following table sets forth the key terms and fair values of our interest rate swap derivatives (dollars in thousands):

								Fair Value at
Notional						Effective	Expiration	December 31,
Amount			Fixed Rate		Floating Rate Index	Date	Date	2015			2014
$	100,000		0.8055	%	One-Month LIBOR	9/2/2014	9/1/2016	$	(148	)	$	(317	)
100,000			0.8100	%	One-Month LIBOR	9/2/2014	9/1/2016	(151		)	(324		)
100,000			1.6730	%	One-Month LIBOR	9/1/2015	8/1/2019	(1,217		)	239
100,000			1.7300	%	One-Month LIBOR	9/1/2015	8/1/2019	(1,429		)	35
13,941		(1)	1.3900	%	One-Month LIBOR	10/13/2015	10/1/2020	53			—
100,000			1.9013	%	One-Month LIBOR	9/1/2016	12/1/2022	(138		)	—
100,000			1.9050	%	One-Month LIBOR	9/1/2016	12/1/2022	(45		)	—
50,000			1.9079	%	One-Month LIBOR	9/1/2016	12/1/2022	(32		)	—
36,200		-1	3.8300	%	One-Month LIBOR + 2.25%	11/2/2010	11/2/2015	—			(400		)
100,000			0.8320	%	One-Month LIBOR	1/3/2012	9/1/2015	—			(407		)
100,000			0.8320	%	One-Month LIBOR	1/3/2012	9/1/2015	—			(407		)
								$	(3,107	)	$	(1,581	)

(1) The notional amount of this instrument is scheduled to amortize to $12.1 million.

Schedule of fair value and balance sheet classification of interest rate derivatives

The table below sets forth the fair value of our interest rate derivatives as well as their classification on our consolidated balance sheets (in thousands):

		Fair Value at
		December 31,
Derivatives	Balance Sheet Location	2015			2014
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets	$	53		$	274
Interest rate swaps designated as cash flow hedges	Interest rate derivatives	(3,160		)	(1,855		)

Schedule of effect of interest rate derivatives on consolidated statements of operations and comprehensive income

The table below presents the effect of our interest rate derivatives on our consolidated statements of operations and comprehensive income (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Amount of (losses) gains recognized in accumulated other comprehensive income (loss) (“AOCI”) (effective portion)	$	(4,739	)	$	(7,799	)	$	6,791
Amount of losses reclassified from AOCI into interest expense (effective portion)	3,599			2,990			2,740
Amount of loss recognized in interest expense (ineffective portion)	386			—			—
Amount of loss reclassified from AOCI into loss on early extinguishment of debt	—			38			—

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Redeemable Noncontrolling Interest (Tables)

12 Months Ended

Dec. 31, 2015

Noncontrolling Interest [Abstract]

Schedule of activity for redeemable noncontrolling interest

The table below sets forth the activity in redeemable noncontrolling interests in our LW Redstone, LLC and Stevens Investors, LLC joint ventures described in Note 6 (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Beginning balance	$	18,417		$	17,758		$	10,298
Contributions from noncontrolling interests	1,654			—			—
Distributions to noncontrolling interests	(2,964		)	(1,369		)	(1,037		)
Net income attributable to noncontrolling interests	2,227			2,162			1,376
Adjustment to arrive at fair value of interests	(116		)	(134		)	7,121
Ending balance	$	19,218		$	18,417		$	17,758

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Equity - COPT and Subsidiaries (Tables)

12 Months Ended

Dec. 31, 2015

Stockholders' Equity Note [Abstract]

Schedule of additional information pertaining to preferred shares

The table below sets forth additional information pertaining to COPT’s outstanding preferred shares (dollars in thousands, except per share data):

Series	# of Shares Issued	Aggregate Liquidation Preference		Month of Issuance	Annual Dividend Yield		Annual Dividend Per Share		Earliest Redemption Date
Series K	531,667	$	26,583	January 2007	5.600	%	$	2.80000	1/9/2017
Series L	6,900,000	172,500		June 2012	7.375	%	$	1.84375	6/27/2017
	7,431,667	$	199,083

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Equity - COPLP and Subsidiaries (Tables)

12 Months Ended

Dec. 31, 2015

Class of Stock [Line Items]

Schedule of additional information pertaining to preferred shares

The table below sets forth additional information pertaining to COPT’s outstanding preferred shares (dollars in thousands, except per share data):

Series	# of Shares Issued	Aggregate Liquidation Preference		Month of Issuance	Annual Dividend Yield		Annual Dividend Per Share		Earliest Redemption Date
Series K	531,667	$	26,583	January 2007	5.600	%	$	2.80000	1/9/2017
Series L	6,900,000	172,500		June 2012	7.375	%	$	1.84375	6/27/2017
	7,431,667	$	199,083

Corporate Office Properties, L.P. [Member]

Class of Stock [Line Items]

Schedule of additional information pertaining to preferred shares

The table below sets forth information pertaining to preferred units in COPLP held by COPT at December 31, 2015 (dollars in thousands, except per unit data):

Series	# of Units Issued	Aggregate Liquidation Preference		Month of Issuance	Annual Distribution Yield		Annual Distribution Per Unit		Earliest Redemption Date
Series K	531,667	$	26,583	January 2007	5.600	%	$	2.80000	1/9/2017
Series L	6,900,000	172,500		June 2012	7.375	%	$	1.84375	6/27/2017
	7,431,667	$	199,083

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Share-Based Compensation and Other Compensation Matters (Tables)

12 Months Ended

Dec. 31, 2015

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Summary of restricted share transactions under the entity's share-based compensation plans

The following table summarizes restricted shares under the share-based compensation plans for 2013, 2014 and 2015:

	Shares		Weighted Average Grant Date Fair Value
Unvested at December 31, 2012	434,643		$	29.67
Granted	193,833		25.91
Forfeited	(9,541	)	27.59
Vested	(241,487	)	30.97
Unvested at December 31, 2013	377,448		26.96
Granted	216,607		26.73
Forfeited	(21,335	)	25.10
Vested	(182,213	)	28.56
Unvested at December 31, 2014	390,507		26.19
Granted	201,024		28.69
Forfeited	(10,550	)	26.05
Vested	(202,781	)	26.07
Unvested at December 31, 2015	378,200		$	27.58
Unvested shares as of December 31, 2015 that are expected to vest	364,666		$	27.61

Schedule of PSU's Granted

We made the following grants of PSUs to executives from 2011 through 2015 (dollars in thousands):

Grant Date	Number of PSUs Granted	Performance Period Commencement Date	Performance Period End Date	Grant Date Fair Value		Number of PSUs Outstanding as of December 31, 2015
3/3/2011	56,883	3/3/2011	3/2/2014	$	2,796	—
3/1/2012	54,070	1/1/2012	12/31/2014	1,772		—
3/1/2013	69.579	1/1/2013	12/31/2015	1,867		51,556
3/6/2014	49,103	1/1/2014	12/31/2016	1,723		37,843
3/5/2015	45,656	1/1/2015	12/31/2017	1,678		45,656

Schedule of payouts for defined performance under performance-based awards of share-based compensation

The number of PSUs earned (“earned PSUs”) at the end of the performance period will be determined based on the percentile rank of COPT’s total shareholder return relative to a peer group of companies, as set forth in the following schedule:

Percentile Rank	Earned PSUs Payout %
75th or greater	200% of PSUs granted
50th or greater	100% of PSUs granted
25th	50% of PSUs granted
Below 25th	0% of PSUs granted

Schedule of assumptions used in Monte Carlo models for PSUs

The grant date fair value and certain of the assumptions used in the Monte Carlo models for the PSUs granted in 2013, 2014 and 2015 are set forth below:

	For the Years Ended December 31,
	2015			2014			2013
Grant date fair value	$	36.76		$	35.09		$	26.84
Baseline common share value	$	29.28		$	26.52		$	25.85
Expected volatility of common shares	19.9		%	28.6		%	29.5		%
Risk-free interest rate	0.99		%	0.66		%	0.33		%

Summary of stock option transactions under the entity's share-based compensation plans

The table below sets forth information regarding our outstanding options (dollars in thousands, except per share data):

	Options Outstanding and Exercisable	Weighted Average Exercise Price Per Share	Weighted Average Remaining Contractual Term (in Years)	Aggregate Intrinsic Value
December 31, 2012	798,210	$37.62	3	$	325
December 31, 2013	640,927	$38.11	2	$	68
December 31, 2014	559,736	$39.60	2	$	167
December 31, 2015	425,347	$42.75	1	$	—

Reporting for share-based compensation expense

The table below sets forth our reporting for share based compensation cost (in thousands):

	For the Years Ended December 31,
	2015		2014		2013
General, administrative and leasing expenses	$	5,574	$	5,307	$	5,412
Property operating expenses	1,000		857		1,118
Capitalized to development activities	824		886		1,075
Share-based compensation cost	$	7,398	$	7,050	$	7,605

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Operating Leases (Tables)

12 Months Ended

Dec. 31, 2015

Leases, Operating [Abstract]

Schedule of gross minimum future rentals on noncancelable leases in the entity's properties

Gross minimum future rentals on noncancelable leases in our properties as of December 31, 2015 were as follows (in thousands):

Year Ending December 31,
2016	$	378,780
2017	349,192
2018	278,714
2019	218,977
2020	154,207
Thereafter	433,892
	$	1,813,762

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Information by Business Segment (Tables)

12 Months Ended

Dec. 31, 2015

Segment Reporting [Abstract]

Schedule of segment financial information for real estate operations

The table below reports segment financial information for our reportable segments (in thousands).  We measure the performance of our segments through the measure we define as NOI from real estate operations, which is derived by subtracting property operating expenses from revenues from real estate operations.

	Operating Office Property Segments
	Defense/Information Technology Locations
	Fort Meade/BW Corridor		Northern Virginia Defense/IT		Lackland Air Force Base		Navy Support Locations		Redstone Arsenal		Colorado Defense/IT		Data Center Shells		Total Defense/IT Locations		Regional Office		Operating Wholesale Data Center		Other			Total
Year Ended December 31, 2015
Revenues from real estate operations	$	244,274	$	49,199	$	39,659	$	28,177	$	11,228	$	—	$	21,746	$	394,283	$	98,165	$	19,032	$	7,588		$	519,068
Property operating expenses	83,309		20,107		22,004		13,229		3,497		—		2,298		144,444		36,165		10,402		3,477			194,488
NOI from real estate operations	$	160,965	$	29,092	$	17,655	$	14,948	$	7,731	$	—	$	19,448	$	249,839	$	62,000	$	8,630	$	4,111		$	324,580
Additions to long-lived assets	$	31,883	$	90,248	$	—	$	7,656	$	883	$	—	$	—	$	130,670	$	204,139	$	132	$	328		$	335,269
Transfers from non-operating properties	$	45,560	$	50,690	$	32,307	$	1,408	$	13,190	$	—	$	51,492	$	194,647	$	22,313	$	89,745	$	415		$	307,120
Segment assets at December 31, 2015	$	1,290,028	$	411,196	$	134,381	$	196,090	$	108,038	$	—	$	203,013	$	2,342,746	$	608,471	$	243,338	$	70,914		$	3,265,469
Year Ended December 31, 2014
Revenues from real estate operations	$	233,764	$	48,313	$	34,463	$	31,335	$	10,446	$	—	$	18,421	$	376,742	$	85,025	$	10,430	$	7,514		$	479,711
Property operating expenses	80,824		19,071		19,677		12,576		3,066		—		2,272		137,486		31,427		7,286		3,600			179,799
NOI from real estate operations	$	152,940	$	29,242	$	14,786	$	18,759	$	7,380	$	—	$	16,149	$	239,256	$	53,598	$	3,144	$	3,914		$	299,912
Additions to long-lived assets	$	24,173	$	7,119	$	—	$	10,010	$	4,077	$	—	$	—	$	45,379	$	19,290	$	22	$	(90	)	$	64,601
Transfers from non-operating properties	$	56,699	$	360	$	—	$	—	$	21,014	$	—	$	43,154	$	121,227	$	17,942	$	1,108	$	1,622		$	141,899
Segment assets at December 31, 2014	$	1,264,353	$	372,041	$	102,232	$	195,972	$	97,209	$	—	$	156,214	$	2,188,021	$	526,988	$	163,177	$	73,309		$	2,951,495
Year Ended December 31, 2013
Revenues from real estate operations	$	234,857	$	56,524	$	31,252	$	33,431	$	5,050	$	12,229	$	12,520	$	385,863	$	98,487	$	7,271	$	7,012		$	498,633
Property operating expenses	80,149		19,718		16,784		12,872		1,282		3,797		1,304		135,906		35,488		6,360		2,950			180,704
NOI from real estate operations	$	154,708	$	36,806	$	14,468	$	20,559	$	3,768	$	8,432	$	11,216	$	249,957	$	62,999	$	911	$	4,062		$	317,929
Additions to long-lived assets	$	28,009	$	5,522	$	5	$	4,945	$	3,563	$	200	$	—	$	42,244	$	13,244	$	598	$	791		$	56,877
Transfers from non-operating properties	$	50,067	$	37,234	$	—	$	14	$	48,799	$	987	$	24,200	$	161,301	$	32,692	$	70,106	$	191		$	264,290
Segment assets at December 31, 2013	$	1,229,192	$	385,061	$	103,650	$	195,105	$	77,773	$	—	$	117,012	$	2,107,793	$	556,718	$	166,790	$	74,329		$	2,905,630

Schedule of reconciliation of segment revenues to total revenues

The following table reconciles our segment revenues to total revenues as reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015			2014		2013
Segment revenues from real estate operations	$	519,068		$	479,711	$	498,633
Construction contract and other service revenues	106,402			106,748		62,363
Less: Revenues from discontinued operations (Note 18)	(4		)	14		(37,636		)
Total revenues	$	625,466		$	586,473	$	523,360

Schedule of reconciliation of segment property operating expenses to total property operating expenses

The following table reconciles our segment property operating expenses to property operating expenses as reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015		2014		2013
Segment property operating expenses	$	194,488	$	179,799	$	180,704
Less: Property operating expenses from discontinued operations (Note 18)	6		135		(13,505		)
Total property operating expenses	$	194,494	$	179,934	$	167,199

Schedule of computation of net operating income from service operations

The table below sets forth the computation of our NOI from service operations (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Construction contract and other service revenues	$	106,402		$	106,748		$	62,363
Construction contract and other service expenses	(102,696		)	(100,058		)	(58,875		)
NOI from service operations	$	3,706		$	6,690		$	3,488

Schedule of reconciliation of net operating income from real estate operations and service operations to (loss) income from continuing operations

The following table reconciles our NOI from real estate operations for reportable segments and NOI from service operations to income from continuing operations as reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
NOI from real estate operations	$	324,580		$	299,912		$	317,929
NOI from service operations	3,706			6,690			3,488
Interest and other income	4,517			4,923			3,834
Equity in income of unconsolidated entities	62			229			2,110
Income tax expense	(199		)	(310		)	(1,978		)
Other adjustments:	—
Depreciation and other amortization associated with real estate operations	(140,025		)	(136,086		)	(113,214		)
Impairment losses	(23,289		)	(1,416		)	(5,857		)
General, administrative and leasing expenses	(31,361		)	(31,794		)	(30,869		)
Business development expenses and land carry costs	(13,507		)	(5,573		)	(5,436		)
Interest expense on continuing operations	(89,074		)	(92,393		)	(82,010		)
NOI from discontinued operations	(10		)	(121		)	(24,131		)
Gain (loss) on early extinguishment of debt	85,275			(9,552		)	(27,030		)
COPT consolidated income from continuing operations	$	120,675		$	34,509		$	36,836

Schedule of reconciliation of segment assets to total assets

The following table reconciles our segment assets to the consolidated total assets of COPT and subsidiaries (in thousands):

	As of December 31,
	2015		2014
Segment assets	$	3,265,469	$	2,951,495
Non-operating property assets	450,679		567,586
Other assets	193,164		145,155
Total COPT consolidated assets	$	3,909,312	$	3,664,236

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Discontinued Operations (Tables)

12 Months Ended

Dec. 31, 2015

Discontinued Operations and Disposal Groups [Abstract]

Components of discontinued operations

The table below sets forth the components of discontinued operations reported on our consolidated statements of operations (in thousands):

	For the Years Ended December 31,
	2015			2014			2013
Revenue from real estate operations	$	4		$	(14	)	$	37,636
Property operating expenses	6			135			(13,505		)
Depreciation and amortization	—			—			(4,505		)
Impairment losses	(234		)	(3		)	(26,190		)
General, administrative and leasing expenses	—			—			(4		)
Interest expense	—			—			(8,221		)
Gain on sales of real estate	—			24			2,671
Gain (loss) on early extinguishment of debt	380			(116		)	67,810
Discontinued operations	$	156		$	26		$	55,692

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Earnings Per Share ("EPS") and Earnings Per Unit (“EPU”) (Tables)

12 Months Ended

Dec. 31, 2015

Earnings Per Share [Line Items]

Summary of calculation of numerator and denominator in basic and diluted earning per share

Summaries of the numerator and denominator for purposes of basic and diluted EPS calculations are set forth below (in thousands, except per share data):

	For the Years Ended December 31,
	2015			2014			2013
Numerator:
Income from continuing operations	$	120,675		$	34,509		$	36,836
Gain on sales of real estate, net	68,047			10,671			9,016
Preferred share dividends	(14,210		)	(15,939		)	(19,971		)
Issuance costs associated with redeemed preferred shares	—			(1,769		)	(2,904		)
Income from continuing operations attributable to noncontrolling interests	(10,575		)	(4,955		)	(4,486		)
Income from continuing operations attributable to restricted shares	(706		)	(432		)	(414		)
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	$	163,231		$	22,085		$	18,077
Dilutive effect of common units in the Operating Partnership on diluted EPS from continuing operations	6,397			—			—
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders	$	169,628		$	22,085		$	18,077
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	$	163,231		$	22,085		$	18,077
Discontinued operations	156			26			55,692
Discontinued operations attributable to noncontrolling interests	(3		)	4			(3,351		)
Numerator for basic EPS on net income attributable to COPT common shareholders	$	163,384		$	22,115		$	70,418
Dilutive effect of common units in COPLP	6,403			—			—
Numerator for diluted EPS on net income attributable to COPT common shareholders	$	169,787		$	22,115		$	70,418
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	93,914			88,092			85,167
Dilutive effect of common units	3,692			—			—
Dilutive effect of share-based compensation awards	61			171			57
Denominator for diluted EPS (common shares)	97,667			88,263			85,224
Basic EPS:
Income from continuing operations attributable to COPT common shareholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPT common shareholders	—			—			0.62
Net income attributable to COPT common shareholders	$	1.74		$	0.25		$	0.83
Diluted EPS:
Income from continuing operations attributable to COPT common shareholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPT common shareholders	—			—			0.62
Net income attributable to COPT common shareholders	$	1.74		$	0.25		$	0.83

Schedule of securities excluded from computation of diluted earnings per share

Our diluted EPS computations do not include the effects of the following securities since the conversions of such securities would increase diluted EPS for the respective periods (in thousands):

	Weighted Average Shares Excluded from Denominator for the Years Ended December 31,
	2015	2014	2013
Conversion of common units	—	3,897	3,869
Conversion of Series I preferred units	176	176	176
Conversion of Series K preferred shares	434	434	434

Corporate Office Properties, L.P. [Member]

Earnings Per Share [Line Items]

Summary of calculation of numerator and denominator in basic and diluted earning per share

Summaries of the numerator and denominator for purposes of basic and diluted EPU calculations are set forth below (in thousands, except per unit data):

	For the Years Ended December 31,
	2015			2014			2013
Numerator:
Income from continuing operations	$	120,675		$	34,509		$	36,836
Gain on sales of real estate, net	68,047			10,671			9,016
Preferred unit distributions	(14,870		)	(16,599		)	(20,631		)
Issuance costs associated with redeemed preferred units	—			(1,769		)	(2,904		)
Income from continuing operations attributable to noncontrolling interests	(3,523		)	(3,281		)	(2,977		)
Income from continuing operations attributable to restricted units	(706		)	(432		)	(414		)
Numerator for basic and diluted EPU from continuing operations attributable to COPLP common unitholders	$	169,623		$	23,099		$	18,926
Discontinued operations	156			26			55,692
Discontinued operations attributable to noncontrolling interests	3			5			(930		)
Numerator for basic and diluted EPU on net income attributable to COPLP common unitholders	$	169,782		$	23,130		$	73,688
Denominator (all weighted averages):
Denominator for basic EPU (common units)	97,606			91,989			89,036
Dilutive effect of share-based compensation awards	61			171			57
Denominator for diluted EPU (common units)	97,667			92,160			89,093
Basic EPU:
Income from continuing operations attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPLP common unitholders	—			—			0.62
Net income attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.83
Diluted EPU:
Income from continuing operations attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.21
Discontinued operations attributable to COPLP common unitholders	—			—			0.62
Net income attributable to COPLP common unitholders	$	1.74		$	0.25		$	0.83

Schedule of securities excluded from computation of diluted earnings per share

Our diluted EPU computations do not include the effects of the following securities since the conversions of such securities would increase diluted EPU for the respective periods (in thousands):

	Weighted Average Units Excluded from Denominator for the Years Ended December 31,
	2015	2014	2013
Conversion of Series I preferred units	176	176	176
Conversion of Series K preferred units	434	434	434

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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2015

Commitments and Contingencies Disclosure [Abstract]

Schedule of future minimum rental payments

Future minimum rental payments due under the terms of these operating leases as of December 31, 2015 follow (in thousands):

Year Ending December 31,
2016	$	1,189
2017	1,117
2018	1,071
2019	1,049
2020	1,067
Thereafter	86,798
	$	92,291

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Quarterly Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2015

Quarterly Data [Line Items]

Schedule of selected quarterly information

The tables below set forth selected quarterly information for the years ended December 31, 2015 and 2014 (in thousands, except per share data). Certain of the amounts below have been reclassified to conform to the current period presentation of our consolidated financial statements.

	For the Year Ended December 31, 2015												For the Year Ended December 31, 2014
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter			First Quarter			Second Quarter			Third Quarter			Fourth Quarter
COPT and Subsidiaries
Revenues	$	161,034		$	170,363		$	150,744		$	143,325		$	146,667		$	139,820		$	153,015		$	146,971
Operating income	$	30,575		$	37,471		$	31,993		$	20,055		$	25,206		$	31,836		$	37,422		$	37,148
Income from continuing operations	$	10,987		$	16,839		$	94,279		$	(1,430	)	$	5,660		$	9,248		$	13,727		$	5,874
Discontinued operations	$	(238	)	$	394		$	—		$	—		$	11		$	(198	)	$	191		$	22
Net income	$	14,735		$	17,232		$	94,294		$	62,617		$	5,671		$	9,050		$	24,548		$	5,937
Net income attributable to noncontrolling interests	(1,380		)	(1,451		)	(4,494		)	(3,253		)	(930		)	(1,160		)	(1,828		)	(1,033		)
Net income attributable to COPT	13,355			15,781			89,800			59,364			4,741			7,890			22,720			4,904
Preferred share dividends	(3,552		)	(3,553		)	(3,552		)	(3,553		)	(4,490		)	(4,344		)	(3,553		)	(3,552		)
Issuance costs associated with redeemed preferred shares	—			—			—			—			—			(1,769		)	—			—
Net income attributable to COPT common shareholders	$	9,803		$	12,228		$	86,248		$	55,811		$	251		$	1,777		$	19,167		$	1,352
Basic earnings per common share	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01
Diluted earnings per common share	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01

Corporate Office Properties, L.P. [Member]

Quarterly Data [Line Items]

Schedule of selected quarterly information

COPLP and Subsidiaries
Revenues	$	161,034		$	170,363		$	150,744		$	143,325		$	146,667		$	139,820		$	153,015		$	146,971
Operating income	$	30,575		$	37,471		$	31,993		$	20,055		$	25,206		$	31,836		$	37,422		$	37,148
Income from continuing operations	$	10,987		$	16,839		$	94,279		$	(1,430	)	$	5,660		$	9,248		$	13,727		$	5,874
Discontinued operations	$	(238	)	$	394		$	—		$	—		$	11		$	(198	)	$	191		$	22
Net income	$	14,735		$	17,232		$	94,294		$	62,617		$	5,671		$	9,050		$	24,548		$	5,937
Net income attributable to noncontrolling interests	(818		)	(812		)	(972		)	(918		)	(737		)	(837		)	(897		)	(805		)
Net income attributable to COPLP	13,917			16,420			93,322			61,699			4,934			8,213			23,651			5,132
Preferred unit distributions	(3,717		)	(3,718		)	(3,717		)	(3,718		)	(4,655		)	(4,509		)	(3,718		)	(3,717		)
Issuance costs associated with redeemed preferred units	—			—			—			—			—			(1,769		)	—			—
Net income attributable to COPLP common unitholders	$	10,200		$	12,702		$	89,605		$	57,981		$	279		$	1,935		$	19,933		$	1,415
Basic earnings per common unit	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01
Diluted earnings per common unit	$	0.10		$	0.13		$	0.91		$	0.59		$	0.00		$	0.02		$	0.22		$	0.01

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Organization (Details) ft² in Thousands	Dec. 31, 2015 ft² a Property MW
Properties under redevelopment [Member]
Investments in real estate
Number of real estate properties	4
Square footage of real estate properties (in square feet) | ft²	156
Operating office properties [Member]
Investments in real estate
Number of real estate properties	177
Square footage of real estate properties (in square feet) | ft²	18,100
Operating office properties [Member] | Single-tenant data centers [Member]
Investments in real estate
Number of real estate properties	9
Office properties under, or contractually committed for, construction or approved for redevelopment [Member]
Investments in real estate
Number of real estate properties	13
Square footage of real estate properties (in square feet) | ft²	1,500
Partially operational properties [Member] | Properties under redevelopment [Member]
Investments in real estate
Number of real estate properties	1
Land controlled for future development [Member]
Investments in real estate
Square footage of real estate properties (in square feet) | a	1,439
Developable square footage of real estate properties (in square feet) | ft²	17,600
Operating Wholesale Data Center [Member]
Investments in real estate
Critical load (in MW's) | MW	19.25

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Organization (Details 2) - Corporate Office Properties, L.P. [Member]	12 Months Ended
	Dec. 31, 2015
Common Units [Member]
Forms of ownership in Operating Partnership and ownership percentage by the entity
Percentage ownership in operating partnership	96.30%
Preferred Units [Member]
Forms of ownership in Operating Partnership and ownership percentage by the entity
Percentage ownership in operating partnership	95.50%

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Summary of Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2015
Properties
Period after the cessation of major construction activities for considering property as operational if leases have not commenced earlier (in years)	1 year
Period after the cessation of major construction activities for considering property as partially operational if leases have commenced earlier (in years)	1 year
Property, Plant and Equipment [Line Items]
Period used for recovery analysis of long-lived assets to be held and used that may be impaired (in years)	10 years
Minimum [Member] | Buildings and building improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Minimum [Member] | Land improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years
Minimum [Member] | Equipment and personal property [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	3 years
Maximum [Member] | Buildings and building improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Maximum [Member] | Land improvements [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	20 years
Maximum [Member] | Equipment and personal property [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years

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Summary of Significant Accounting Policies (Details 1)	12 Months Ended
	Dec. 31, 2015 Form
Cash and Cash Equivalents
Maximum term until original maturity to classify cash and liquid investments as cash and cash equivalent (in months)	3 months
Share-Based Compensation
Number of forms of share based compensation plans	3
Corporate Office Properties, L.P. [Member]
Noncontrolling Interest [Abstract]
Interests in several real estate entities owned directly by COPT	1.00%

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Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounting Policies [Abstract]
Minimum adjusted taxable income to be distributed to shareholders to qualify as a REIT (as a percent)	90.00%
Subsequent period during which entity would be disqualified as a REIT if during any tax year entity fails to qualify as a REIT (in years)	4 years
Dividends Payable [Line Items]
Approximate amount by which basis of assets and liabilities for tax reporting purposes is lower than amount reported on consolidated balance sheet	$ 224
Common Shares [Member]
Dividends Payable [Line Items]
Ordinary income (as a percent)	38.30%	64.50%	71.80%
Long-term capital gain (as a percent)	61.70%	6.50%	22.40%
Return of capital (as a percent)	0.00%	29.00%	5.80%
Preferred Shares [Member]
Dividends Payable [Line Items]
Ordinary income (as a percent)	38.30%	90.90%	76.20%
Long-term capital gain (as a percent)	61.70%	9.10%	23.80%
Return of capital (as a percent)	0.00%	0.00%	0.00%

XML

Fair Value Measurements (Details) $ in Millions	12 Months Ended
	Dec. 31, 2015 USD ($) joint_ventnure	Dec. 31, 2014 USD ($)
Schedule of Trading Security [Line Items]
Number of joint ventures | joint_ventnure	2
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Management [Member]
Schedule of Trading Security [Line Items]
Maximum percentage of participants' compensation which is deferrable (as a percent)	100.00%
Balance of the plan which was fully funded | $	$ 5.8	$ 5.9

XML

Fair Value Measurements (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Liabilities:
Interest rate derivatives	$ 3,160	$ 1,855
Fair value measurement on a recurring basis [Member]
Assets:
Interest rate derivatives	53	274
Assets	5,816	6,156
Liabilities:
Deferred compensation plan liability	5,763	5,882
Interest rate derivatives	3,160	1,855
Liabilities	8,923	7,737
Fair value measurement on a recurring basis [Member] | Mutual funds [Member]
Assets:
Marketable securities in deferred compensation plan	5,658	5,756
Fair value measurement on a recurring basis [Member] | Other [Member]
Assets:
Marketable securities in deferred compensation plan	105	126
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Assets	5,763	5,882
Liabilities:
Liabilities	0	0
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mutual funds [Member]
Assets:
Marketable securities in deferred compensation plan	5,658	5,756
Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Other [Member]
Assets:
Marketable securities in deferred compensation plan	105	126
Fair value measurement on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Interest rate derivatives	53	274
Assets	53	274
Liabilities:
Deferred compensation plan liability	5,763	5,882
Interest rate derivatives	3,160	1,855
Liabilities	8,923	7,737
Corporate Office Properties, L.P. [Member]
Liabilities:
Interest rate derivatives	3,160	1,855
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member]
Assets:
Interest rate derivatives	53	274
Assets	53	274
Liabilities:
Interest rate derivatives	3,160	1,855
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets:
Assets	0	0
Corporate Office Properties, L.P. [Member] | Fair value measurement on a recurring basis [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets:
Interest rate derivatives	53	274
Assets	53	274
Liabilities:
Interest rate derivatives	$ 3,160	$ 1,855

XML

Fair Value Measurements (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($) Property
Fair value of impaired properties and other assets
Impairment losses	$ 23,289	$ 1,416	$ 5,857
Exit costs included in impairment losses in connection with dispositions	0	0	979
Fair value measurement on a recurring basis [Member]
Fair value of impaired properties and other assets
Assets	5,816	6,156
Fair value measurement on a nonrecurring basis [Member]
Fair value of impaired properties and other assets
Exit costs included in impairment losses in connection with dispositions			419
Fair value measurement on a nonrecurring basis [Member] | Discontinued Operations [Member]
Fair value of impaired properties and other assets
Impairment losses			15,200
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member]
Fair value of impaired properties and other assets
Impairment losses	23,500	$ 1,400
Assets	13,850
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of impaired properties and other assets
Assets	13,850
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Indicative Bids [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of impaired properties and other assets
Assets	24,423
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Comparable Sales Price [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of impaired properties and other assets
Assets	10,850
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Colorado Springs [Member]
Fair value of impaired properties and other assets
Impairment losses	12,800
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Aberdeen, Maryland [Member]
Fair value of impaired properties and other assets
Impairment losses	6,600
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | White Marsh, Maryland [Member]
Fair value of impaired properties and other assets
Impairment losses	2,600
Real Estate Investment Properties, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Land controlled for future development [Member] | Northern Virginia [Member]
Fair value of impaired properties and other assets
Impairment losses	1,300
Assets Held-for-sale, Net [Member] | Fair value measurement on a nonrecurring basis [Member]
Fair value of impaired properties and other assets
Assets	21,423
Assets Held-for-sale, Net [Member] | Fair value measurement on a nonrecurring basis [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair value of impaired properties and other assets
Assets	$ 21,423
Property Conveyances [Member] | Fair value measurement on a nonrecurring basis [Member]
Fair value of impaired properties and other assets
Impairment losses			11,000
Exit costs included in impairment losses in connection with dispositions			560
Other Properties with Shortened Holding Periods [Member] | Fair value measurement on a nonrecurring basis [Member] | White Marsh, Maryland [Member]
Fair value of impaired properties and other assets
Impairment losses			$ 5,900
Number of properties, shortened holding period | Property			2

XML

Concentration of Revenue (Details) - Tenants [Member] - United States Government [Member]	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Rental revenue [Member]
Concentration Risk
Percentage of revenue	20.00%	18.00%	18.00%
Construction contract revenue [Member]
Concentration Risk
Percentage of revenue	90.00%	90.00%	90.00%

XML

Properties, net (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Properties
Gross	$ 4,158,616	$ 4,014,336	$ 3,811,950	$ 3,859,960
Operating properties, net	2,920,529	2,751,488
Operating properties, net [Member]
Properties
Less: accumulated depreciation	(700,363)	(703,083)
Operating properties, net [Member] | Land [Member]
Properties
Gross	463,305	439,355
Operating properties, net [Member] | Buildings and improvements [Member]
Properties
Gross	$ 3,157,587	$ 3,015,216

XML

Properties, net (Details 2) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Properties
Projects in development or held for future development	$ 429,219	$ 545,426
Projects in development or held for future development [Member] | Land in development or held for future development [Member]
Properties
Projects in development or held for future development	207,774	214,977
Projects in development or held for future development [Member] | Development in progress, excluding land [Member]
Properties
Projects in development or held for future development	$ 221,445	$ 330,449

XML

Properties, net (Details 3) $ in Thousands	Dec. 31, 2015 USD ($) Property	Dec. 31, 2014 USD ($) Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale, net	$ 96,782	$ 14,339
2015 Assets Held For Sale [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Properties, net	90,188
Deferred rent receivable	2,891
Intangible assets on real estate acquisitions, net	1,591
Deferred leasing costs, net	1,391
Lease incentives, net	721
Assets held for sale, net	$ 96,782
2015 Assets Held For Sale [Member] | White Marsh, Maryland [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of land parcels held-for-sale | Property	13
2015 Assets Held For Sale [Member] | San Antonio [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of land parcels held-for-sale | Property	2
Held-for-sale [Member] | White Marsh, Maryland [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of land parcels held-for-sale | Property		2
Assets held for sale, net		$ 14,300

XML

Properties, net (Details 4) $ / shares in Units, ft² in Thousands, $ in Thousands				12 Months Ended
	Aug. 07, 2015 USD ($) ft²	Apr. 15, 2015 USD ($) ft²	Mar. 19, 2015 USD ($) ft²	Dec. 31, 2015 USD ($) $ / shares	Dec. 31, 2014 USD ($) $ / shares
Business Combination
Weighted average amortization period of intangible assets				11 years
Pro Forma Information
Pro forma total revenues				$ 641,982	$ 623,013
Pro forma net income attributable to COPT common shareholders				$ 167,079	$ 20,796
Pro Forma EPS Basic (in dollars per share) | $ / shares				$ 1.77	$ 0.23
Pro Forma EPS Diluted (in dollars per share) | $ / shares				$ 1.77	$ 0.23
Tenant relationship value [Member]
Business Combination
Weighted average amortization period of intangible assets				11 years
Below-market cost arrangements [Member]
Business Combination
Weighted average amortization period of intangible assets				35 years
250 W Pratt St [Member] | Baltimore, Maryland [Member]
Business Acquisition [Line Items]
Square footage of real estate properties (in square feet) | ft²			367
Acquired property percentage leased			96.20%
Payments to acquire real estate			$ 61,800
2600 Park Tower Drive [Member] | Vienna, Virginia [Member]
Business Acquisition [Line Items]
Square footage of real estate properties (in square feet) | ft²		237
Acquired property percentage leased		100.00%
Payments to acquire real estate		$ 80,500
100 and 30 Light Street [Member] | Baltimore, Maryland [Member]
Business Acquisition [Line Items]
Square footage of real estate properties (in square feet) | ft²	558
Acquired property percentage leased	93.50%
Payments to acquire real estate	$ 121,200
Liabilities incurred	55,000
Fair value assumption of debt	$ 55,500
2015 Property Acquisitions [Member]
Business Combination
Land, operating properties				$ 55,076
Building and improvements				139,540
Intangible assets on real estate acquisitions				75,729
Total assets				270,345
Below-market leases				(6,808)
Total acquisition cost				263,537
Finite-lived Intangible Assets Acquired				$ 75,729
Weighted average amortization period of intangible assets				10 years
Contributed revenues				$ 20,200
Net income from continuing operations since acquisition date				1,200
Acquisition related costs				4,100
2015 Property Acquisitions [Member] | Tenant relationship value [Member]
Business Combination
Finite-lived Intangible Assets Acquired				$ 31,183
Weighted average amortization period of intangible assets				12 years
2015 Property Acquisitions [Member] | Leases, Acquired-in-Place [Member]
Business Combination
Finite-lived Intangible Assets Acquired				$ 35,139
Weighted average amortization period of intangible assets				7 years
2015 Property Acquisitions [Member] | Above Market Leases [Member]
Business Combination
Finite-lived Intangible Assets Acquired				$ 6,720
Weighted average amortization period of intangible assets				4 years
2015 Property Acquisitions [Member] | Below-market cost arrangements [Member]
Business Combination
Finite-lived Intangible Assets Acquired				$ 2,687
Weighted average amortization period of intangible assets				40 years

XML

Properties, net (Details 5) $ in Thousands			12 Months Ended
	Aug. 28, 2015 USD ($)	Dec. 23, 2013 USD ($)	Dec. 31, 2015 USD ($) ft² Property buillding	Dec. 31, 2014 USD ($) ft² Property buillding	Dec. 31, 2013 USD ($) ft² Property buillding
Dispositions
Gain (loss) on early extinguishment of debt			$ 85,275	$ (9,552)	$ (27,030)
Non-operating Properties [Member]
Dispositions
Gain on Disposition			4,000	5,600
Sale price of non-operating properties			$ 18,100	$ 28,300	$ 3,500
Operating properties, net [Member]
Dispositions
Number of Buildings Disposed | buillding			9	8	31
Total Rentable Square Feet | ft²			1,597,000	302,958	2,345,000
Transaction value of operating property dispositions			$ 347,785	$ 28,835	$ 293,301
Gain on Disposition			$ 64,033	$ 5,093	$ 2,671
Operating properties, net [Member] | 1550 Westbranch Drive [Member]
Dispositions
Number of Buildings Disposed | buillding			1
Total Rentable Square Feet | ft²			160,000
Transaction value of operating property dispositions			$ 27,800
Gain on Disposition			$ 0
Operating properties, net [Member] | 15000 and 15010 Conference Center Drive [Member]
Dispositions
Number of Buildings Disposed | buillding			2
Total Rentable Square Feet | ft²			665,000
Transaction value of operating property dispositions			$ 167,335
Gain on Disposition			$ 0
Operating properties, net [Member] | 13200 Woodland Park Road [Member]
Dispositions
Number of Buildings Disposed | buillding			1
Total Rentable Square Feet | ft²			397,000
Transaction value of operating property dispositions			$ 84,000
Gain on Disposition			$ 42,515
Operating properties, net [Member] | 9900, 9910, 9920 Franklin Square Drive [Member]
Dispositions
Number of Buildings Disposed | buillding			3
Total Rentable Square Feet | ft²			135,000
Transaction value of operating property dispositions			$ 24,150
Gain on Disposition			$ 6,468
Operating properties, net [Member] | 9690 Deereco Road and 375 W Padonia Road [Member]
Dispositions
Number of Buildings Disposed | buillding			2
Total Rentable Square Feet | ft²			240,000
Transaction value of operating property dispositions			$ 44,500
Gain on Disposition			$ 15,050
Operating properties, net [Member] | 4969 and 4979 Mercantile Rd [Member]
Dispositions
Number of Buildings Disposed | buillding				2
Total Rentable Square Feet | ft²				96,721
Transaction value of operating property dispositions				$ 5,960
Gain on Disposition				$ 2,124
Operating properties, net [Member] | 9930 and 9940 Franklin Square [Member]
Dispositions
Number of Buildings Disposed | buillding				2
Total Rentable Square Feet | ft²				71,992
Transaction value of operating property dispositions				$ 10,475
Gain on Disposition				$ 2,303
Operating properties, net [Member] | 5020, 5022, 5024 and 5026 Campbell Boulevard [Member]
Dispositions
Number of Buildings Disposed | buillding				4
Total Rentable Square Feet | ft²				134,245
Transaction value of operating property dispositions				$ 12,400
Gain on Disposition				666
Operating properties, net [Member] | 920 Elkridge Landing Road [Member]
Dispositions
Number of Buildings Disposed | buillding					1
Total Rentable Square Feet | ft²					103,000
Transaction value of operating property dispositions					$ 6,900
Gain on Disposition					$ 0
Operating properties, net [Member] | 4230 Forbes Boulevard [Member]
Dispositions
Number of Buildings Disposed | buillding					1
Total Rentable Square Feet | ft²					56,000
Transaction value of operating property dispositions					$ 5,600
Gain on Disposition					$ 1,507
Operating properties, net [Member] | December 2013 Colorado Springs Portfolio Disposition [Member]
Dispositions
Number of Buildings Disposed | buillding					15
Total Rentable Square Feet | ft²					1,165,000
Transaction value of operating property dispositions					$ 133,925
Gain on Disposition					$ 1,164
Operating properties, net [Member] | December 2013 Portfolio Conveyance [Member]
Dispositions
Number of Buildings Disposed | buillding					14
Total Rentable Square Feet | ft²					1,021,000
Transaction value of operating property dispositions					$ 146,876
Gain on Disposition					$ 0
Greater Philadelphia [Member]
Dispositions
Depreciation Expense Resulting From Useful Life Change				$ 12,900
15000 and 15010 Conference Center Drive [Member] | Northern Virginia [Member] | Operating properties, net [Member]
Dispositions
Debt settled through the surrender of real estate assets	$ 150,000
Gain (loss) on early extinguishment of debt	$ 84,800
December 2013 Portfolio Conveyance [Member] | Operating properties, net [Member]
Dispositions
Debt settled through the surrender of real estate assets		$ 146,500
Gain (loss) on early extinguishment of debt		$ 67,800
Newly-constructed properties placed in service [Member]
Dispositions
Square Feet of Properties Placed in Service | ft²			897,000	692,000	812,000
Number of real estate properties | Property			7	5	8
Newly Redeveloped Properties Placed In Service [Member] | Greater Philadelphia and St. Mary's County, Maryland [Member]
Dispositions
Square Feet of Properties Placed in Service | ft²			170,000
Number of real estate properties | Property			2
Properties under Construction or Contractually Commited for Construction [Member]
Dispositions
Total Rentable Square Feet | ft²			1,300,000
Number of real estate properties | Property			9
Properties under redevelopment [Member]
Dispositions
Total Rentable Square Feet | ft²			156,000
Number of real estate properties | Property			4

XML

Real Estate Joint Ventures (Details) $ in Thousands				12 Months Ended
	Aug. 07, 2014 USD ($)	Dec. 11, 2013	Sep. 17, 2013 USD ($) shares	Dec. 31, 2015 USD ($) ft²	Dec. 31, 2013 USD ($) Property	Dec. 31, 2014 USD ($)	Dec. 31, 2012 USD ($)
Investments in consolidated real estate joint ventures
Investing receivables				$ 47,875		$ 52,147
Notes receivable from City of Huntsville [Member]
Investments in consolidated real estate joint ventures
Amount of advanced				37,200
Investing receivables				$ 44,875		$ 49,147
Stevens Investors, LLC [Member] | Minimum [Member]
Investments in consolidated real estate joint ventures
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company				60.00%
LW Redstone Company, LLC [Member]
Investments in consolidated real estate joint ventures
Partner's capital account upon formation				$ 9,000
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company				85.00%
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the entity's partners				15.00%
Number of years following construction commencement threshold achievement before partner's interest can be purchased at fair value				5 years
Construction commencement threshold (in square feet) | ft²				4,400,000.0
Construction commencement completed (in sqft) | ft²				594,000
LW Redstone Company, LLC [Member] | Maximum [Member]
Investments in consolidated real estate joint ventures
Infrastructure costs anticipated to be funded by entity for reimbursement by the City of Huntsville (in dollars)				$ 76,000
Percentage of residual distributable cash flows in excess of unpaid cumulative preferred returns and return of invested capital entitled to the company				85.00%
M Square Associates, LLC [Member]
Investments in consolidated real estate joint ventures
Percentage of residual amounts distributed to each member				50.00%
Consolidated real estate joint ventures [Member]
Investments in consolidated real estate joint ventures
Total Assets				$ 209,351
Encumbered Assets				130,966
Total Liabilities				$ 91,983
Arundel Preserve 5, LLC [Member]
Investments in consolidated real estate joint ventures
Ownership (as a percent)			50.00%
Arundel Preserve 5, LLC [Member] | Common Shares [Member]
Investments in consolidated real estate joint ventures
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in units) | shares			221,501
Acquisition of property and noncontrolling interest in other consolidated entity for COPLP common units (in dollars)			$ 5,200
MOR Forbes 2 LLC [Member]
Investments in consolidated real estate joint ventures
Ownership (as a percent)		50.00%
Unconsolidated real estate joint ventures [Member]
Investments in consolidated real estate joint ventures
Ownership (as a percent)					20.00%
Number of buildings operated by the joint venture | Property					16
Investment balance							$ (6,400)
Gain on disposal					$ 6,300
LW Redstone Company, LLC [Member] | Primary Beneficiary [Member]
Investments in consolidated real estate joint ventures
Ownership (as a percent)				85.00%
Total Assets				$ 147,612
Encumbered Assets				82,721
Total Liabilities				$ 54,022
M Square Associates, LLC [Member] | Primary Beneficiary [Member]
Investments in consolidated real estate joint ventures
Ownership (as a percent)				50.00%
Total Assets				$ 56,455
Encumbered Assets				48,245
Total Liabilities				$ 37,568
Stevens Investors, LLC [Member] | Primary Beneficiary [Member]
Investments in consolidated real estate joint ventures
Ownership (as a percent)				95.00%
Total Assets				$ 5,284
Encumbered Assets				0
Total Liabilities				$ 393
COPT-FD Indian Head LLC [Member] | Primary Beneficiary [Member]
Investments in consolidated real estate joint ventures
Proceeds from real estate and real estate joint ventures	$ 6,400

XML

Intangible Assets on Real Estate Acquisitions (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Intangible assets on real estate acquisitions
Gross Carrying Amount	$ 227,481	$ 188,467
Accumulated Amortization	129,143	144,613
Net Carrying Amount	98,338	43,854
Amortization of the intangible assets	$ 18,500	15,200	$ 16,200
Weighted average amortization period of intangible assets	11 years
Estimated future amortization expense associated with the intangible asset categories for the next five years
2016	$ 18,800
2017	16,300
2018	11,600
2019	8,800
2020	7,000
In-place lease value [Member]
Intangible assets on real estate acquisitions
Gross Carrying Amount	134,664	123,759
Accumulated Amortization	89,540	101,040
Net Carrying Amount	$ 45,124	22,719
Weighted average amortization period of intangible assets	6 years
Tenant relationship value [Member]
Intangible assets on real estate acquisitions
Gross Carrying Amount	$ 62,172	42,301
Accumulated Amortization	23,468	28,492
Net Carrying Amount	$ 38,704	13,809
Weighted average amortization period of intangible assets	11 years
Below-market cost arrangements [Member]
Intangible assets on real estate acquisitions
Gross Carrying Amount	$ 15,102	12,415
Accumulated Amortization	6,692	5,984
Net Carrying Amount	$ 8,410	6,431
Weighted average amortization period of intangible assets	35 years
Above-market leases [Member]
Intangible assets on real estate acquisitions
Gross Carrying Amount	$ 14,210	8,659
Accumulated Amortization	8,491	8,159
Net Carrying Amount	$ 5,719	500
Weighted average amortization period of intangible assets	4 years
Other [Member]
Intangible assets on real estate acquisitions
Gross Carrying Amount	$ 1,333	1,333
Accumulated Amortization	952	938
Net Carrying Amount	$ 381	$ 395
Weighted average amortization period of intangible assets	27 years

XML

Investing Receivables (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 47,875	$ 52,147
Notes receivable from City of Huntsville [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 44,875	49,147
Notes receivable from City of Huntsville [Member] | LW Redstone Company, LLC [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)	9.95%
Debt instrument, term	30 years
Other investing loans receivable [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 3,000	$ 3,000

XML

Prepaid Expenses and Other Assets, Net (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses	$ 23,009	$ 20,570
Lease incentives	11,133	13,344
Furniture, fixtures and equipment, net	6,004	6,637
Deferred financing costs, net	5,867	4,849
Deferred tax asset, net	3,467	4,002
Construction contract costs incurred in excess of billings	3,261	6,656
Equity method investments	1,636	2,368
Other assets	5,647	2,875
Prepaid expenses and other assets, net	$ 60,024	$ 61,301

XML

Prepaid Expenses and Other Assets, Net (Details 2) - TRS [Member] - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Tax Credit Carryforward [Line Items]
Operating loss carry forward	$ 5,065	$ 5,012
Share-based compensation	363	976
Accrued payroll	133	195
Property	(32)	(119)
Valuation allowance	(2,062)	(2,062)
Deferred tax asset, net	$ 3,467	$ 4,002

XML

Debt (Details) - USD ($)			12 Months Ended
	May. 06, 2015	Apr. 20, 2015	Dec. 31, 2015	Jun. 29, 2015	Dec. 31, 2014	May. 14, 2014	Dec. 31, 2013
Debt
Debt, net			$ 2,077,752,000		$ 1,914,036,000
Deferred financing costs, net			5,867,000		4,849,000
Long-term debt gross			2,097,230,000
Mortgage and Other Secured Loans [Member]
Debt
Debt, net			331,000,000		422,467,000
Fixed rate mortgage loans [Member]
Debt
Debt, net			$ 281,208,000		385,769,000
Stated Interest Rates, low end of range (as a percent)			3.96%
Stated Interest Rates, high end of range (as a percent)			7.87%
Unamortized premium included in carrying value			$ 514,000		42,000
Weighted average interest rate excluding incremental rate			6.08%
Variable rate secured loans [Member]
Debt
Debt, net			$ 49,792,000		36,698,000
Stated interest rate (as a percent)			2.20%
Revolving Credit Facility [Member]
Debt
Debt, net			$ 43,500,000		83,000,000
Term Loan Facilities [Member]
Debt
Debt, net			$ 515,900,000		517,846,000
Weighted average interest rate (as a percent)			1.92%
Additional borrowing capacity available provided there is no default under the agreement			$ 150,000,000
Aggregate additional borrowing capacity			430,000,000
Unsecured notes payable [Member]
Debt
Debt, net			1,500,000		1,607,000
Unamortized discount included in carrying value			554,000		654,000
4.25% Exchangeable Senior Notes [Member]
Debt
Debt, net			$ 0		572,000
Stated interest rate (as a percent)							4.25%
Debt Instrument, Redemption, Actual Redemption Price As Percentage Of Principal		100.00%
Unamortized discount included in carrying value					3,000
Long-term debt gross					$ 575,000
London Interbank Offered Rate (LIBOR) [Member] | Variable rate secured loans [Member] | Minimum [Member]
Debt
Variable rate, spread (as a percent)			1.85%
London Interbank Offered Rate (LIBOR) [Member] | Variable rate secured loans [Member] | Maximum [Member]
Debt
Variable rate, spread (as a percent)			2.00%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt
Variable rate, spread (as a percent)			0.875%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt
Variable rate, spread (as a percent)			1.60%
London Interbank Offered Rate (LIBOR) [Member] | Term Loan Facilities [Member] | Minimum [Member]
Debt
Variable rate, spread (as a percent)			0.90%
London Interbank Offered Rate (LIBOR) [Member] | Term Loan Facilities [Member] | Maximum [Member]
Debt
Variable rate, spread (as a percent)			2.60%
Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Debt
Weighted average interest rate (as a percent)			1.40%		1.47%
Loans Payable [Member]
Debt
Deferred financing costs, net			$ 8,000,000		$ 6,000,000
Line of Credit [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]
Debt
Variable rate, spread (as a percent)	0.875%
Line of Credit [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]
Debt
Variable rate, spread (as a percent)	1.60%
Senior Notes [Member] | 3.60% Senior Notes [Member]
Debt
Debt, net			$ 346,714,000		346,311,000
Stated interest rate (as a percent)			3.60%
Interest rate on debt (as a percent)			3.70%
Unamortized discount included in carrying value			$ 2,200,000		2,500,000
Senior Notes [Member] | 5.250% Senior Notes [Member]
Debt
Debt, net			$ 245,731,000		245,306,000
Stated interest rate (as a percent)			5.25%
Interest rate on debt (as a percent)			5.49%
Unamortized discount included in carrying value			$ 3,800,000		4,200,000
Senior Notes [Member] | 3.70% Senior Notes [Member]
Debt
Debt, net			$ 297,378,000		296,927,000
Stated interest rate (as a percent)			3.70%			3.70%
Interest rate on debt (as a percent)			3.85%
Unamortized discount included in carrying value			$ 2,100,000		2,400,000
Senior Notes [Member] | 5.0% Senior Notes [Member]
Debt
Debt, net			$ 296,019,000		$ 0
Stated interest rate (as a percent)			5.00%	5.00%
Interest rate on debt (as a percent)			5.15%
Unamortized discount included in carrying value			$ 3,300,000
Senior Notes [Member] | 4.25% Exchangeable Senior Notes [Member]
Debt
Stated interest rate (as a percent)					4.25%

XML

Debt (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule on basis of which debt matures
2016	$ 208,109
2017	3,252
2018	3,400
2019	167,014
2020	315,252
Thereafter	1,400,203
Total	2,097,230
Debt maturing in 2019 that may be extended for a one year period	43,500
Net discounts and deferred financing costs	19,500
Capitalized interest costs	$ 7,200	$ 6,100	$ 8,800

XML

Debt (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Debt, net	$ 2,077,752	$ 1,914,036
Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Debt, net	1,200,000
Carrying Amount [Member]
Debt Instrument [Line Items]
Variable-rate debt	609,194	637,544
Debt, net	2,077,752	1,914,036
Carrying Amount [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Fixed-rate debt	1,185,842	888,544
Carrying Amount [Member] | Other Fixed-Rate Debt [Member]
Debt Instrument [Line Items]
Fixed-rate debt	282,716	387,948
Estimated Fair Value [Member]
Debt Instrument [Line Items]
Variable-rate debt	610,987	642,091
Debt, net	2,114,636	1,900,067
Estimated Fair Value [Member] | Unsecured Senior Notes [Member]
Debt Instrument [Line Items]
Fixed-rate debt	1,211,658	901,599
Estimated Fair Value [Member] | Other Fixed-Rate Debt [Member]
Debt Instrument [Line Items]
Fixed-rate debt	$ 291,991	$ 356,377

XML

Debt (Details 4)										1 Months Ended	12 Months Ended
	Dec. 17, 2015 USD ($)	Aug. 28, 2015 USD ($)	Jun. 29, 2015 USD ($)	May. 06, 2015 USD ($) extensions	May. 14, 2014 USD ($)	Dec. 23, 2013 USD ($)	Aug. 03, 2012 USD ($)	Feb. 14, 2012 USD ($)	Sep. 01, 2011 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt											$ 85,275,000	$ (9,552,000)	$ (27,030,000)
Term Credit Facility Effective February 2012 [Member]
Debt Instrument [Line Items]
Initial amount borrowed								$ 250,000,000
Term Credit Facility Effective August 2012 [Member]
Debt Instrument [Line Items]
Initial amount borrowed							$ 120,000,000
Additional borrowing capacity available provided there is no default under the agreement							$ 80,000,000
Term Credit Facility Effective September 2011 [Member]
Debt Instrument [Line Items]
Initial amount borrowed									$ 400,000,000
Repayments of debt												100,000,000	$ 150,000,000
4.25% Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (as a percent)													4.25%
Unamortized discount included in carrying value										$ 3,000		$ 3,000
Gain (loss) on early extinguishment of debt													$ (25,900,000)
Amount of loans repaid upon entry into Revolving Credit Facility and Term Loan Agreement													$ 239,400,000
Fixed rate mortgage loans [Member]
Debt Instrument [Line Items]
Debt settled through the surrender of real estate assets		$ 150,000,000
Minimum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)											0.875%
Minimum [Member] | Term Credit Facility Effective February 2012 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)				0.90%
Minimum [Member] | Term Credit Facility Effective August 2012 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)							2.10%
Maximum [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)											1.60%
Maximum [Member] | Term Credit Facility Effective February 2012 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)				1.85%
Maximum [Member] | Term Credit Facility Effective August 2012 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)							2.60%
Secured Loans Due November 2015 And January 2016 [Member]
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt										$ (9,100,000)
Secured Loan Due November 2015 [Member]
Debt Instrument [Line Items]
Stated interest rate (as a percent)										5.53%		5.53%
Amount of loans repaid upon entry into Revolving Credit Facility and Term Loan Agreement										$ 103,000,000
Secured Loan Due January 2016 [Member]
Debt Instrument [Line Items]
Stated interest rate (as a percent)										5.56%		5.56%
Amount of loans repaid upon entry into Revolving Credit Facility and Term Loan Agreement										$ 108,500,000
Revolving Credit Facility [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Maximum availability											$ 800,000,000
Expansion right, maximum borrowing capacity											$ 1,300,000,000
Amount available as a percentage of unencumbered Asset value											60.00%
Line of credit facility, extension fee percentage											0.075%
Remaining borrowing capacity											$ 741,700,000
Weighted average borrowings											$ 125,000,000	$ 15,900,000
Weighted average interest rate (as a percent)										1.47%	1.40%	1.47%
Line of Credit [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Number of extensions | extensions				2
Extension option period (in years)				6 months
Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Commitment fee percentage				0.125%
Line of Credit [Member] | Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)				0.875%
Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Commitment fee percentage				0.30%
Line of Credit [Member] | Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)				1.60%
Line of Credit [Member] | Term Loan Facilities [Member]
Debt Instrument [Line Items]
Maximum availability				$ 300,000,000
Increase to maximum borrowing capacity				200,000,000
Aggregate maximum borrowing capacity				$ 500,000,000
Unsecured Debt [Member] | Term Credit Facility Effective December 2015 [Member]
Debt Instrument [Line Items]
Maximum availability	$ 250,000,000
Initial amount borrowed	100,000,000
Increase to maximum borrowing capacity	$ 150,000,000
Unsecured Debt [Member] | Minimum [Member] | Term Credit Facility Effective December 2015 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	1.40%
Unsecured Debt [Member] | Maximum [Member] | Term Credit Facility Effective December 2015 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Variable rate, spread (as a percent)	2.35%
Senior Notes [Member]
Debt Instrument [Line Items]
Redemption price (percent)											100.00%
Senior Notes [Member] | 3.70% Senior Notes [Member]
Debt Instrument [Line Items]
Initial amount borrowed					$ 297,300,000
Loan amount											$ 300,000,000
Stated interest rate (as a percent)					3.70%						3.70%
Debt issuance as a percentage of principal amount					99.739%
Unamortized discount included in carrying value										$ 2,400,000	$ 2,100,000	$ 2,400,000
Interest rate on debt (as a percent)											3.85%
Senior Notes [Member] | 3.70% Senior Notes [Member] | Adjusted Treasury [Member]
Debt Instrument [Line Items]
Basis points used in determining redemption price prior to maturity											250.00%
Senior Notes [Member] | 5.0% Senior Notes [Member]
Debt Instrument [Line Items]
Loan amount			$ 300,000,000
Stated interest rate (as a percent)			5.00%								5.00%
Debt issuance as a percentage of principal amount			99.51%
Unamortized discount included in carrying value											$ 3,300,000
Interest rate on debt (as a percent)											5.15%
Proceeds from debt, net			$ 296,600,000
Senior Notes [Member] | 5.0% Senior Notes [Member] | Adjusted Treasury [Member]
Debt Instrument [Line Items]
Basis points used in determining redemption price prior to maturity											450.00%
Senior Notes [Member] | 3.60% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (as a percent)											3.60%
Unamortized discount included in carrying value										2,500,000	$ 2,200,000	2,500,000
Interest rate on debt (as a percent)											3.70%
Senior Notes [Member] | 3.60% Senior Notes [Member] | Adjusted Treasury [Member]
Debt Instrument [Line Items]
Basis points used in determining redemption price prior to maturity											300.00%
Senior Notes [Member] | 5.250% Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (as a percent)											5.25%
Unamortized discount included in carrying value										$ 4,200,000	$ 3,800,000	$ 4,200,000
Interest rate on debt (as a percent)											5.49%
Senior Notes [Member] | 5.250% Senior Notes [Member] | Adjusted Treasury [Member]
Debt Instrument [Line Items]
Basis points used in determining redemption price prior to maturity											400.00%
Senior Notes [Member] | 4.25% Exchangeable Senior Notes [Member]
Debt Instrument [Line Items]
Stated interest rate (as a percent)										4.25%		4.25%
Operating properties, net [Member] | December 2013 Portfolio Conveyance [Member]
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt						$ 67,800,000
Debt settled through the surrender of real estate assets						$ 146,500,000
Operating properties, net [Member] | 15000 and 15010 Conference Center Drive [Member] | Northern Virginia [Member]
Debt Instrument [Line Items]
Gain (loss) on early extinguishment of debt		84,800,000
Debt settled through the surrender of real estate assets		$ 150,000,000

XML

Interest Rate Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of (losses) gains recognized in accumulated other comprehensive income (loss) (“AOCI”) (effective portion)	$ (4,739)	$ (7,799)	$ 6,791
Interest expense [Member]
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of losses reclassified from AOCI into interest rate derivatives	3,599	2,990	2,740
Loss on early extinguishment of debt [Member]
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of losses reclassified from AOCI into interest rate derivatives	0	38	0
Interest rate swaps
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of (losses) gains recognized in accumulated other comprehensive income (loss) (“AOCI”) (effective portion)	(4,739)	(7,799)	6,791
Approximate amount of losses to be reclassified from AOCL to interest expense over the next 12 months	3,300
Interest rate derivatives in liability position, fair value	3,200
Termination value to settle obligations under interest rate derivative agreements	3,600
Interest rate swaps | Interest expense [Member]
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of losses reclassified from AOCI into interest rate derivatives	3,599	2,990	2,740
Amount of loss recognized in interest expense (ineffective portion)	386	0	0
Interest rate swaps | Loss on early extinguishment of debt [Member]
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of losses reclassified from AOCI into interest rate derivatives	0	38	$ 0
Interest rate swaps | Prepaid expenses and other assets [Member]
Fair value of interest rate derivatives and balance sheet classification
Interest rate derivatives	53	274
Interest rate swaps | Interest rate derivative [Member]
Fair value of interest rate derivatives and balance sheet classification
Fair value of Interest rate swaps classified as interest rate derivatives	(3,160)	(1,855)
Designated [Member]
Fair values of interest rate swap derivatives
Fair value of interest rate swaps	(3,107)	(1,581)
Designated [Member] | Interest rate swap, effective date September 2, 2014, swap one [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000
Fixed Rate (as a percent)	0.8055%
Fair value of interest rate swaps	$ (148)	(317)
Designated [Member] | Interest rate swap, effective date September 2, 2014, swap two [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000
Fixed Rate (as a percent)	0.81%
Fair value of interest rate swaps	$ (151)	(324)
Designated [Member] | Interest rate swap, effective date September 1, 2015, swap one [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000
Fixed Rate (as a percent)	1.673%
Fair value of interest rate swaps	$ (1,217)	239
Designated [Member] | Interest rate swap, effective date September 1, 2015, swap two [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000
Fixed Rate (as a percent)	1.73%
Fair value of interest rate swaps	$ (1,429)	35
Designated [Member] | Interest rate swap, effective October 1, 2015 [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 13,941
Fixed Rate (as a percent)	1.39%
Fair value of interest rate swaps	$ 53	0
Notional amount after scheduled amortization	12,100
Designated [Member] | Interest rate swap, effective September 1, 2016, swap one [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000
Fixed Rate (as a percent)	1.9013%
Fair value of interest rate swaps	$ (138)	0
Designated [Member] | Interest rate swap, effective September 1, 2016, swap two [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000
Fixed Rate (as a percent)	1.905%
Fair value of interest rate swaps	$ (45)	0
Designated [Member] | Interest rate swap, effective September 1, 2016, swap three [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 50,000
Fixed Rate (as a percent)	1.9079%
Fair value of interest rate swaps	$ (32)	0
Designated [Member] | Interest rate swap, effective date November 2, 2010 [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 36,200
Fixed Rate (as a percent)	3.83%
Fair value of interest rate swaps	$ 0	(400)
Designated [Member] | Interest rate swap, effective date November 2, 2010 [Member] | London Interbank Offered Rate (LIBOR) [Member]
Fair values of interest rate swap derivatives
Floating Rate Index (percent)	2.25%
Designated [Member] | Interest rate swap, effective date January 3, 2012, swap three [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000
Fixed Rate (as a percent)	0.832%
Fair value of interest rate swaps	$ 0	(407)
Designated [Member] | Interest rate swap, effective date January 3, 2012, swap four [Member]
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000
Fixed Rate (as a percent)	0.832%
Fair value of interest rate swaps	$ 0	$ (407)

XML

Redeemable Noncontrolling Interest (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Redeemable Noncontrolling Interest [Roll Forward]
Beginning balance	$ 18,417	$ 17,758	$ 10,298
Contributions from noncontrolling interests	1,654	0	0
Distributions to noncontrolling interests	(2,964)	(1,369)	(1,037)
Net income attributable to noncontrolling interests	2,227	2,162	1,376
Adjustment to arrive at fair value of interests	(116)	(134)	7,121
Ending balance	$ 19,218	$ 18,417	$ 17,758

XML

Equity - COPT and Subsidiaries (Details) - USD ($)			1 Months Ended		12 Months Ended
	Jun. 16, 2014	Jul. 15, 2013	Nov. 30, 2014	Oct. 31, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Preferred Stock
Number of shares issued					7,431,667
Aggregate liquidation preference					$ 199,083,000	$ 199,083,000
Stock redeemed or called during period value						50,000,000	$ 84,750,000
Common Shares
Shares issued to the public			5,520,000
Per share value of common and preferred shares issued to the public (in dollars per share)			$ 27.30
Net proceeds from issue of shares after underwriter discounts but before offering expenses			$ 148,900,000			$ 148,666,000	$ 117,961,000
Number of common shares for each converted common unit (in shares)					1
Number of operating partnerships units converted into common shares (in units)					160,160	140,149	311,343
Dividends declared per common share					$ 1.1000	$ 1.10	$ 1.10
Common Stock Issued to Public Under At-the-Market Program [Member]
Common Shares
Shares issued to the public		1,500,000.0			890,241		1,500,000
At-market-stock, offering program established, aggregate value				$ 150,000,000.0
Issuance of stock, weighted average price per share					$ 30.29
Payments of stock issuance costs		$ 600,000			$ 400,000
At-market stock, offering program established, remaining capacity					84,000,000
Share Price		$ 26.05
Proceeds from Issuance of Common Stock, Net of Issuance Costs		$ 38,500,000			$ 26,600,000
Preferred Shares [Member]
Preferred Stock
Number of preferred shares authorized					25,000,000
Number of preferred shares of beneficial interest authorized (in dollars per share)					$ 0.01
Series H [Member]
Preferred Stock
Annual dividend yield	7.50%
Preferred stock, redemption price per share	$ 25
Stock redeemed or called during period value	$ 50,000,000
Issuance costs associated with redeemed preferred shares	$ 1,800,000
Series K [Member]
Preferred Stock
Number of shares issued					531,667
Aggregate liquidation preference					$ 26,583,000
Annual dividend yield					5.60%
Annual dividend per share (in dollars per share)					$ 2.80000
Number of common shares to be issued on conversion of each preferred share					0.8163
Series L [Member]
Preferred Stock
Number of shares issued					6,900,000
Aggregate liquidation preference					$ 172,500,000
Annual dividend yield					7.375%
Annual dividend per share (in dollars per share)					$ 1.84375

XML

Equity - COPLP and Subsidiaries (Details) - USD ($) $ / shares in Units, $ in Thousands				1 Months Ended	12 Months Ended
	Jun. 16, 2014	Jul. 16, 2013	Jul. 15, 2013	Nov. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Preferred Stock
Number of shares issued					7,431,667
Aggregate liquidation preference					$ 199,083	$ 199,083
Stock redeemed or called during period value						50,000	$ 84,750
Common Shares
Shares issued to the public				5,520,000
Per share value of common and preferred shares issued to the public (in dollars per share)				$ 27.30
Net proceeds from issue of shares after underwriter discounts but before offering expenses				$ 148,900		$ 148,666	$ 117,961
Number of common shares for each converted common unit (in shares)					1
Number of operating partnerships units converted into common shares (in units)					160,160	140,149	311,343
Dividends declared per common share					$ 1.1000	$ 1.10	$ 1.10
Preferred units in COPLP					$ 8,800	$ 8,800
Common Stock Issued to Public Under At-the-Market Program [Member]
Common Shares
Shares issued to the public			1,500,000.0		890,241		1,500,000
Issuance of stock, weighted average price per share					$ 30.29
Payments of stock issuance costs			$ 600		$ 400
Series H [Member]
Preferred Stock
Annual dividend yield	7.50%
Preferred stock, redemption price per share	$ 25
Stock redeemed or called during period value	$ 50,000
Issuance costs associated with redeemed preferred shares	$ 1,800
Series K [Member]
Preferred Stock
Number of shares issued					531,667
Aggregate liquidation preference					$ 26,583
Annual dividend yield					5.60%
Annual dividend per share (in dollars per share)					$ 2.80000
Number of common shares to be issued on conversion of each preferred share					0.8163
Series L [Member]
Preferred Stock
Number of shares issued					6,900,000
Aggregate liquidation preference					$ 172,500
Annual dividend yield					7.375%
Annual dividend per share (in dollars per share)					$ 1.84375
Corporate Office Properties, L.P. [Member]
Preferred Stock
Number of shares issued					7,431,667
Aggregate liquidation preference					$ 199,083
Stock redeemed or called during period value						50,000	$ 84,750
Common Shares
Net proceeds from issue of shares after underwriter discounts but before offering expenses						$ 148,666	$ 117,961
Number of common shares for each converted common unit (in shares)					1
Number of operating partnerships units converted into common shares (in units)					160,160.00	140,149.000	311,343.000
Dividends declared per common share					$ 1.1	$ 1.10	$ 1.10
Corporate Office Properties, L.P. [Member] | Common Stock Issued to Public Under At-the-Market Program [Member]
Common Shares
Shares issued to the public		1,500,000			890,241
Net proceeds from issue of shares after underwriter discounts but before offering expenses		$ 38,500			$ 26,600
Issuance of stock, weighted average price per share		$ 26.05			$ 30.29
Payments of stock issuance costs		$ 600			$ 400
Corporate Office Properties, L.P. [Member] | Common Units [Member]
Common Shares
Percentage ownership in operating partnership					96.30%	96.00%
Corporate Office Properties, L.P. [Member] | Conversion of Series I preferred units [Member]
Preferred Stock
Annual dividend yield					7.50%
Annual cumulative preferred return increment frequency					5 years
Common Shares
Limited partners' capital account, units issued					352,000
Preferred units in COPLP					$ 8,800
Preferred stock, liquidation preference per share					$ 25
Common units conversion basis units issuable					0.5
Corporate Office Properties, L.P. [Member] | Series H [Member]
Preferred Stock
Annual dividend yield	7.50%
Preferred stock, redemption price per share	$ 25
Stock redeemed or called during period value	$ 50,000
Issuance costs associated with redeemed preferred shares	$ 1,800
Corporate Office Properties, L.P. [Member] | Series K [Member]
Preferred Stock
Number of shares issued					531,667
Aggregate liquidation preference					$ 26,583
Annual dividend yield					5.60%
Annual dividend per share (in dollars per share)					$ 2.80000
Number of common shares to be issued on conversion of each preferred share					0.8163
Corporate Office Properties, L.P. [Member] | Series L [Member]
Preferred Stock
Number of shares issued					6,900,000
Aggregate liquidation preference					$ 172,500
Annual dividend yield					7.375%
Annual dividend per share (in dollars per share)					$ 1.84375
Corporate Office Properties, L.P. [Member] | Common Shares [Member]
Common Shares
Shares issued to the public				5,520,000
Per share value of common and preferred shares issued to the public (in dollars per share)				$ 27.30
Net proceeds from issue of shares after underwriter discounts but before offering expenses				$ 148,900

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Share-Based Compensation and Other Compensation Matters (Details 1) - Restricted shares [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Shares
Unvested at the beginning of the period (in shares)	390,507	377,448	434,643
Stock awards granted (in shares or units)	201,024	216,607	193,833
Forfeited (in shares)	(10,550)	(21,335)	(9,541)
Vested (in shares)	(202,781)	(182,213)	(241,487)
Unvested at the end of the period (in shares)	378,200	390,507	377,448
Weighted Average Grant Date Fair Value
Unvested at the beginning of the period (in dollars per share)	$ 26.19	$ 26.96	$ 29.67
Grant date fair value (in dollars per share)	28.69	26.73	25.91
Forfeited (in dollars per share)	26.05	25.10	27.59
Vested (in dollars per share)	26.07	28.56	30.97
Unvested at the end of the period (in dollars per share)	$ 27.58	$ 26.19	$ 26.96
Restricted shares expected to vest (in shares)	364,666
Restricted shares expected to vest (in dollars per share)	$ 27.61

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Share-Based Compensation and Other Compensation Matters (Details 2) - Performance share units [Member] - USD ($) $ in Thousands						12 Months Ended
	Mar. 05, 2015	Mar. 06, 2014	Mar. 01, 2013	Mar. 02, 2012	Mar. 03, 2011	Dec. 31, 2015
2011 PSU Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares or units)					56,883
Aggregate grant date fair value					$ 2,796
Unvested at the end of the period (in shares)						0
2012 PSU Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares or units)				54,070
Aggregate grant date fair value				$ 1,772
Unvested at the end of the period (in shares)						0
2013 PSU Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares or units)			69,579
Aggregate grant date fair value			$ 1,867
Unvested at the end of the period (in shares)						51,556
2014 PSU Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares or units)		49,103
Aggregate grant date fair value		$ 1,723
Unvested at the end of the period (in shares)						37,843
2015 PSU Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares or units)	45,656
Aggregate grant date fair value	$ 1,678
Unvested at the end of the period (in shares)						45,656

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Share-Based Compensation and Other Compensation Matters (Details 3) - Performance share units [Member] - $ / shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Potential earned PSUs payout for defined levels of performance under awards
Earned PSUs payout (as a percent of PSUs granted) on 75th or greater percentile rank	200.00%
Earned PSUs payout (as a percent of PSUs granted) on 50th percentile rank	100.00%
Earned PSUs payout (as a percent of PSUs granted) on 25th percentile rank	50.00%
Performance share units granted on percentile rank below 25th (as a percent)	0.00%
Assumptions used to value stock awards
Grant date fair value (in dollars per share)	$ 36.76	$ 35.09	$ 26.84
Baseline value per common share (in dollars per share)	$ 29.28	$ 26.52	$ 25.85
Expected volatility of common shares (as a percent)	19.90%	28.60%	29.50%
Risk-free interest rate (as a percent)	0.99%	0.66%	0.33%

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Share-Based Compensation and Other Compensation Matters (Details 4) - Options [Member] - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options Outstanding and Exercisable (in shares)	425,347	559,736	640,927	798,210
Weighted Average Exercise Price Per Share (in dollars per share)	$ 42.75	$ 39.60	$ 38.11	$ 37.62
Weighted Average Remaining Contractual Term (years)	1 year	2 years	2 years	3 years
Aggregate Intrinsic Value		$ 167	$ 68	$ 325

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Share-Based Compensation and Other Compensation Matters (Details 5) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-Based Compensation
Share-based compensation cost	$ 7,398	$ 7,050	$ 7,605
General, adminstrative and leasing expenses [Member]
Share-Based Compensation
Share-based compensation cost	5,574	5,307	5,412
Property operating expenses [Member]
Share-Based Compensation
Share-based compensation cost	1,000	857	1,118
Capitalized to development activities [Member]
Share-Based Compensation
Share-based compensation cost	$ 824	$ 886	$ 1,075

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Share-Based Compensation and Other Compensation Matters (Details 6) $ / shares in Units, $ in Thousands					12 Months Ended
	Mar. 05, 2015 shares	Mar. 06, 2014 USD ($) shares	Mar. 01, 2013 USD ($) shares	Mar. 02, 2012 USD ($) shares	Dec. 31, 2015 USD ($) Percentile_Rank $ / shares shares	Dec. 31, 2014 USD ($) $ / shares shares	Dec. 31, 2013 USD ($) $ / shares shares	May. 31, 2010 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Decrease in tax benefit from share-based compensation					$ 513	$ 3	$ 122
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period					10 years
Restricted shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of vested shares					$ 4,900	$ 4,900	$ 6,300
Stock awards granted (in shares or units) | shares					201,024	216,607	193,833
Grant date fair value (in dollars per share) | $ / shares					$ 28.69	$ 26.73	$ 25.91
Vested (in shares) | shares					(202,781)	(182,213)	(241,487)
Vested (in dollars per share) | $ / shares					$ 26.07	$ 28.56	$ 30.97
Unrecognized compensation cost					$ 6,300
Expected weighted average period during which unrecognized compensation cost will be recognized					2 years
Restricted shares [Member] | Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated pre-vesting forfeitures (as a percent)					0.00%
Restricted shares [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated pre-vesting forfeitures (as a percent)					5.00%
Performance share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period of the award					3 years
The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25% | Percentile_Rank					2
Grant date fair value (in dollars per share) | $ / shares					$ 36.76	$ 35.09	$ 26.84
Estimated pre-vesting forfeitures (as a percent)					0.00%
Unrecognized compensation cost					$ 1,700
Expected weighted average period during which unrecognized compensation cost will be recognized					2 years
Phantom Share Units (PSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of vested shares					$ 413
Stock awards granted (in shares or units) | shares					24,056
Aggregate grant date fair value					$ 642
Grant date fair value (in dollars per share) | $ / shares					$ 26.70
Vested (in shares) | shares					(15,485)
Vested (in dollars per share) | $ / shares					$ 26.77
Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate intrinsic value of options exercised					$ 300	$ 225	$ 258
Deferred Share Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated pre-vesting forfeitures (as a percent)					0.00%
Unrecognized compensation cost					$ 223
Amended and Restated 2008 Omnibus Equity and Incentive Plan [Member] | Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of common shares of beneficial interest authorized to be issued | shares								5,900,000.0
2014 PSU Grants [Member] | Performance share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares or units) | shares		49,103
Aggregate grant date fair value		$ 1,723
2012 PSU Grants [Member] | Performance share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for PSU Awards Vested in Period (in shares) | shares	40,309
Stock awards granted (in shares or units) | shares				54,070
Aggregate grant date fair value				$ 1,772
2013 PSU Grants [Member] | Performance share units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock awards granted (in shares or units) | shares			69,579
Aggregate grant date fair value			$ 1,867
2013 and 2014 PSU Grants [Member] | Performance share units [Member] | Former Chief Financial Officer [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued for PSU Awards Vested in Period (in shares) | shares	15,289

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Operating Leases (Details) $ in Thousands	Dec. 31, 2015 USD ($)
Gross minimum future rentals
2016	$ 378,780
2017	349,192
2018	278,714
2019	218,977
2020	154,207
Thereafter	433,892
Total	$ 1,813,762

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Information by Business Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment financial information for real estate operations
Revenues from real estate operations	$ 519,068	$ 479,711	$ 498,633
Property operating expenses	194,488	179,799	180,704
NOI from real estate operations	324,580	299,912	317,929
Segment assets	3,909,312	3,664,236
Operating Segments [Member]
Segment financial information for real estate operations
Revenues from real estate operations	519,068	479,711	498,633
Property operating expenses	194,488	179,799	180,704
NOI from real estate operations	324,580	299,912	317,929
Additions to long-lived assets	335,269	64,601	56,877
Transfers from non-operating properties	307,120	141,899	264,290
Segment assets	3,265,469	2,951,495	2,905,630
Operating Segments [Member] | Defense/Information Technology Sector [Member]
Segment financial information for real estate operations
Revenues from real estate operations	394,283	376,742	385,863
Property operating expenses	144,444	137,486	135,906
NOI from real estate operations	249,839	239,256	249,957
Additions to long-lived assets	130,670	45,379	42,244
Transfers from non-operating properties	194,647	121,227	161,301
Segment assets	2,342,746	2,188,021	2,107,793
Operating Segments [Member] | Defense/Information Technology Sector [Member] | Fort Meade/BW Corridor [Member]
Segment financial information for real estate operations
Revenues from real estate operations	244,274	233,764	234,857
Property operating expenses	83,309	80,824	80,149
NOI from real estate operations	160,965	152,940	154,708
Additions to long-lived assets	31,883	24,173	28,009
Transfers from non-operating properties	45,560	56,699	50,067
Segment assets	1,290,028	1,264,353	1,229,192
Operating Segments [Member] | Defense/Information Technology Sector [Member] | Northern Virginia Defense/IT [Member]
Segment financial information for real estate operations
Revenues from real estate operations	49,199	48,313	56,524
Property operating expenses	20,107	19,071	19,718
NOI from real estate operations	29,092	29,242	36,806
Additions to long-lived assets	90,248	7,119	5,522
Transfers from non-operating properties	50,690	360	37,234
Segment assets	411,196	372,041	385,061
Operating Segments [Member] | Defense/Information Technology Sector [Member] | Lackland Air Force Base [Member]
Segment financial information for real estate operations
Revenues from real estate operations	39,659	34,463	31,252
Property operating expenses	22,004	19,677	16,784
NOI from real estate operations	17,655	14,786	14,468
Additions to long-lived assets	0	0	5
Transfers from non-operating properties	32,307	0	0
Segment assets	134,381	102,232	103,650
Operating Segments [Member] | Defense/Information Technology Sector [Member] | Navy Support Locations [Member]
Segment financial information for real estate operations
Revenues from real estate operations	28,177	31,335	33,431
Property operating expenses	13,229	12,576	12,872
NOI from real estate operations	14,948	18,759	20,559
Additions to long-lived assets	7,656	10,010	4,945
Transfers from non-operating properties	1,408	0	14
Segment assets	196,090	195,972	195,105
Operating Segments [Member] | Defense/Information Technology Sector [Member] | Redstone Arsenal [Member]
Segment financial information for real estate operations
Revenues from real estate operations	11,228	10,446	5,050
Property operating expenses	3,497	3,066	1,282
NOI from real estate operations	7,731	7,380	3,768
Additions to long-lived assets	883	4,077	3,563
Transfers from non-operating properties	13,190	21,014	48,799
Segment assets	108,038	97,209	77,773
Operating Segments [Member] | Defense/Information Technology Sector [Member] | Colorado Defense / IT [Member]
Segment financial information for real estate operations
Revenues from real estate operations	0	0	12,229
Property operating expenses	0	0	3,797
NOI from real estate operations	0	0	8,432
Additions to long-lived assets	0	0	200
Transfers from non-operating properties	0	0	987
Segment assets	0	0	0
Operating Segments [Member] | Defense/Information Technology Sector [Member] | Data Center Shells [Member]
Segment financial information for real estate operations
Revenues from real estate operations	21,746	18,421	12,520
Property operating expenses	2,298	2,272	1,304
NOI from real estate operations	19,448	16,149	11,216
Additions to long-lived assets	0	0	0
Transfers from non-operating properties	51,492	43,154	24,200
Segment assets	203,013	156,214	117,012
Operating Segments [Member] | Regional Office [Member]
Segment financial information for real estate operations
Revenues from real estate operations	98,165	85,025	98,487
Property operating expenses	36,165	31,427	35,488
NOI from real estate operations	62,000	53,598	62,999
Additions to long-lived assets	204,139	19,290	13,244
Transfers from non-operating properties	22,313	17,942	32,692
Segment assets	608,471	526,988	556,718
Operating Segments [Member] | Operating Wholesale Data Center [Member]
Segment financial information for real estate operations
Revenues from real estate operations	19,032	10,430	7,271
Property operating expenses	10,402	7,286	6,360
NOI from real estate operations	8,630	3,144	911
Additions to long-lived assets	132	22	598
Transfers from non-operating properties	89,745	1,108	70,106
Segment assets	243,338	163,177	166,790
Operating Segments [Member] | Other Segments [Member]
Segment financial information for real estate operations
Revenues from real estate operations	7,588	7,514	7,012
Property operating expenses	3,477	3,600	2,950
NOI from real estate operations	4,111	3,914	4,062
Additions to long-lived assets	328	(90)	791
Transfers from non-operating properties	415	1,622	191
Segment assets	$ 70,914	$ 73,309	$ 74,329

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Information by Business Segment (Details 2) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of segment revenues to total revenues
Segment revenues from real estate operations									$ 519,068	$ 479,711	$ 498,633
Construction contract and other service revenues									106,402	106,748	62,363
Less: Revenues from discontinued operations									(4)	14	(37,636)
Total revenues	$ 143,325	$ 150,744	$ 170,363	$ 161,034	$ 146,971	$ 153,015	$ 139,820	$ 146,667	625,466	586,473	523,360
Reconciliation of segment property operating expenses to property operating expenses
Segment property operating expenses									194,488	179,799	180,704
Less: Property operating expenses from discontinued operations									6	135	(13,505)
Total property operating expenses									194,494	179,934	167,199
Computation of net operating income from service operations
Construction contract and other service revenues									106,402	106,748	62,363
Construction contract and other service expenses									(102,696)	(100,058)	(58,875)
NOI from service operations									3,706	6,690	3,488
Reconciliation of NOI from real estate operations and NOI from service operations to (loss) income from continuing operations
NOI from real estate operations									324,580	299,912	317,929
NOI from service operations									3,706	6,690	3,488
Interest and other income									4,517	4,923	3,834
Equity in income of unconsolidated entities									62	229	2,110
Income tax expense									(199)	(310)	(1,978)
Other adjustments:
Depreciation and amortization associated with real estate operations									(140,025)	(136,086)	(113,214)
Impairment losses									(23,289)	(1,416)	(5,857)
General, administrative and leasing expenses									(31,361)	(31,794)	(30,869)
Business development expenses and land carry costs									(13,507)	(5,573)	(5,436)
Interest expense on continuing operations									(89,074)	(92,393)	(82,010)
NOI from discontinued operations									(10)	(121)	(24,131)
Gain (loss) on early extinguishment of debt									85,275	(9,552)	(27,030)
Income from continuing operations	$ (1,430)	$ 94,279	$ 16,839	$ 10,987	$ 5,874	$ 13,727	$ 9,248	$ 5,660	$ 120,675	$ 34,509	$ 36,836

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Information by Business Segment (Details 3) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of segment assets to total assets
Total COPT consolidated assets	$ 3,909,312	$ 3,664,236
Segment assets [Member]
Reconciliation of segment assets to total assets
Total COPT consolidated assets	3,265,469	2,951,495	$ 2,905,630
Non-operating property assets [Member]
Reconciliation of segment assets to total assets
Total COPT consolidated assets	450,679	567,586
Other assets [Member]
Reconciliation of segment assets to total assets
Total COPT consolidated assets	$ 193,164	$ 145,155

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Discontinued Operations (Details) $ in Thousands			3 Months Ended								12 Months Ended
	Dec. 23, 2013 Property	Dec. 12, 2013 Property	Dec. 31, 2015 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Properties
Revenue from real estate operations											$ 4	$ (14)	$ 37,636
Property operating expenses											6	135	(13,505)
Depreciation and amortization											0	0	(4,505)
Impairment losses											(234)	(3)	(26,190)
General, administrative and leasing expenses											0	0	(4)
Interest expense											0	0	(8,221)
Gain on sales of real estate											0	24	2,671
Gain (loss) on early extinguishment of debt											380	(116)	67,810
Discontinued operations			$ 0	$ 0	$ 394	$ (238)	$ 22	$ 191	$ (198)	$ 11	$ 156	$ 26	$ 55,692
December 2013 Colorado Springs Portfolio Disposition [Member]
Properties
Number of properties sold | Property		15
Baltimore/Washington Corridor [Member]
Properties
Number of properties transferred | Property	9
Colorado Springs [Member]
Properties
Number of properties transferred | Property	5

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Earnings Per Share ("EPS") and Earnings Per Unit (“EPU”) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended								12 Months Ended
		Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Numerator:
Income (loss) from continuing operations		$ (1,430)	$ 94,279	$ 16,839	$ 10,987	$ 5,874	$ 13,727	$ 9,248	$ 5,660	$ 120,675		$ 34,509		$ 36,836
Gain on sales of real estate, net										68,047		10,671		9,016
Preferred share/ unit dividends/ distributions		(3,553)	(3,552)	(3,553)	(3,552)	(3,552)	(3,553)	(4,344)	(4,490)	(14,210)		(15,939)		(19,971)
Issuance costs associated with redeemed preferred shares		0	0	0	0	0	0	(1,769)	0	0		(1,769)		(2,904)
(Income) loss from continuing operations attributable to noncontrolling interests										(10,575)		(4,955)		(4,486)
Income from continuing operations attributable to restricted units										(706)		(432)		(414)
Numerator for basic EPS/EPU from continuing operations attributable to COPT/COPLP common shareholders/unitholders										163,231		22,085		18,077
Dilutive effect of common units in the Operating Partnership on diluted EPS from continuing operations										6,397		0		0
Numerator for diluted EPS/EPU from continuing operations attributable to COPT/COPLP common shareholders/unitholders										169,628		22,085		18,077
Discontinued operations		$ 0	$ 0	$ 394	$ (238)	$ 22	$ 191	$ (198)	$ 11	156		26		55,692
Discontinued operations attributable to noncontrolling interests										(3)		4		(3,351)
Numerator for basic EPS on net income attributable to COPT common shareholders										163,384		22,115		70,418
Dilutive effect of common units in COPLP										6,403		0		0
Numerator for diluted EPS on net income attributable to COPT common shareholders										$ 169,787		$ 22,115		$ 70,418
Denominator (all weighted averages):
Denominator for basic EPS (common shares)										93,914		88,092		85,167
Dilutive effect of common units										3,692		0		0
Dilutive effect of share-based compensation awards										61		171		57
Denominator for basic and diluted EPS (common shares)										97,667		88,263		85,224
Basic EPS:
Income from continuing operations (in dollars per share/unit)	[1]									$ 1.74		$ 0.25		$ 0.21
Discontinued operations (in dollars per share/unit)	[1]									0.00		0.00		0.62
Net income attributable to COPT common shareholders (in dollars per share/unit)		$ 0.59	$ 0.91	$ 0.13	$ 0.10	$ 0.01	$ 0.22	$ 0.02	$ 0.00	1.74	[1]	0.25	[1]	0.83	[1]
Diluted EPS:
Income from continuing operations (in dollars per share/unit)	[1]									1.74		0.25		0.21
Discontinued operations (in dollars per share/unit)	[1]									0.00		0.00		0.62
Net income attributable to COPT common shareholders (in dollars per share/unit)		$ 0.59	$ 0.91	$ 0.13	$ 0.10	$ 0.01	$ 0.22	$ 0.02	$ 0.00	$ 1.74	[1]	$ 0.25	[1]	$ 0.83	[1]
Corporate Office Properties, L.P. [Member]
Numerator:
Income (loss) from continuing operations		$ (1,430)	$ 94,279	$ 16,839	$ 10,987	$ 5,874	$ 13,727	$ 9,248	$ 5,660	$ 120,675		$ 34,509		$ 36,836
Gain on sales of real estate, net										68,047		10,671		9,016
Preferred share/ unit dividends/ distributions		(3,718)	(3,717)	(3,718)	(3,717)	(3,717)	(3,718)	(4,509)	(4,655)	(14,870)		(16,599)		(20,631)
Issuance costs associated with redeemed preferred shares		0	0	0	0	0	0	(1,769)	0	0		(1,769)		(2,904)
(Income) loss from continuing operations attributable to noncontrolling interests										(3,523)		(3,281)		(2,977)
Income from continuing operations attributable to restricted units										(706)		(432)		(414)
Numerator for basic and diluted EPS/EPU from continuing operations attributable to COPT/COPLP common shareholders/unitholders										169,623		23,099		18,926
Discontinued operations		$ 0	$ 0	$ 394	$ (238)	$ 22	$ 191	$ (198)	$ 11	156		26		55,692
Discontinued operations attributable to noncontrolling interests										3		5		(930)
Numerator for basic and diluted EPU on net income attributable to COPLP common unitholders										$ 169,782		$ 23,130		$ 73,688
Denominator (all weighted averages):
Denominator for basic EPS (common shares)										97,606		91,989		89,036
Dilutive effect of share-based compensation awards										61		171		57
Denominator for basic and diluted EPS (common shares)										97,667		92,160		89,093
Basic EPS:
Income from continuing operations (in dollars per share/unit)	[2]									$ 1.74		$ 0.25		$ 0.21
Discontinued operations (in dollars per share/unit)	[2]									0.00		0.00		0.62
Net income attributable to COPT common shareholders (in dollars per share/unit)		$ 0.59	$ 0.91	$ 0.13	$ 0.10	$ 0.01	$ 0.22	$ 0.02	$ 0.00	1.74	[2]	0.25	[2]	0.83	[2]
Diluted EPS:
Income from continuing operations (in dollars per share/unit)	[2]									1.74		0.25		0.21
Discontinued operations (in dollars per share/unit)	[2]									0.00		0.00		0.62
Net income attributable to COPT common shareholders (in dollars per share/unit)		$ 0.59	$ 0.91	$ 0.13	$ 0.10	$ 0.01	$ 0.22	$ 0.02	$ 0.00	$ 1.74	[2]	$ 0.25	[2]	$ 0.83	[2]

[1] Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.

[2] Basic and diluted earnings per common unit are calculated based on amounts attributable to common unitholders of Corporate Office Properties, L.P.

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Earnings Per Share ("EPS") and Earnings Per Unit (“EPU”) (Details 2) - shares	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Conversion of common units [Member]
Antidilutive securities
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)	0	3,897,000	3,869,000
Conversion of Series I preferred units [Member]
Antidilutive securities
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)	176,000	176,000	176,000
Conversion of Series K preferred shares [Member]
Antidilutive securities
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)	434,000	434,000	434,000
Stock Options [Member]
Antidilutive securities
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)	469,000	492,000	636,000
Restricted Stock and Deferred Shares [Member]
Antidilutive securities
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)	410,000	401,000	385,000
Corporate Office Properties, L.P. [Member] | Stock Options [Member]
Antidilutive securities
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)	469,000	492,000	636,000
Corporate Office Properties, L.P. [Member] | Restricted Stock and Deferred Shares [Member]
Antidilutive securities
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)	410,000	401,000	385,000
Corporate Office Properties, L.P. [Member] | Conversion of Series I preferred units [Member]
Antidilutive securities
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)	176,000	176,000	176,000
Corporate Office Properties, L.P. [Member] | Conversion of Series K preferred units [Member]
Antidilutive securities
Weighted average antidilutive securities excluded from computation of diluted earnings per share (in shares)	434,000	434,000	434,000

XML

Commitments and Contingencies (Details)	Dec. 31, 2015 USD ($) Property	Aug. 31, 2010 USD ($)
Tax incremental financing obligation
Liability recognized with regard to tax incremental financing obligation at end of current period	$ 1,900,000
Future minimum rental payments due:
2016	1,189,000
2017	1,117,000
2018	1,071,000
2019	1,049,000
2020	1,067,000
Thereafter	86,798,000
Total	$ 92,291,000
Environmental Indemnity Agreement
Number of lease properties which were provided environmental indemnifications | Property	3
Environmental indemnification to the tenant against losses covered under prior owner's indemnity agreement	$ 5,000,000
Maximum environmental indemnification to the tenant against consequential damages after acquisition of property	$ 12,500,000
Additional costs agreed to be paid by the entity related to construction and environmental regulatory activities (as a percent)	50.00%
Maximum annual additional costs agreed to be paid by the entity related to construction and environmental regulatory activities	$ 300,000
Maximum additional costs agreed to be paid by the entity related to construction and environmental regulatory activities	1,500,000
New Development and Redevelopment Obligations [Member]
Commitments and Contingencies
Contractual obligation	87,800,000
Capital Expenditures For Operating Properties [Member]
Commitments and Contingencies
Contractual obligation	47,900,000
Third Party Construction and Development [Member]
Commitments and Contingencies
Contractual obligation	10,700,000
Other Purchase Obligations [Member]
Commitments and Contingencies
Contractual obligation	$ 3,600,000
Tax Incremental Financing Bond [Member] | Anne Arundel County, Maryland [Member]
Commitments and Contingencies
Loan amount		$ 30,000,000

XML

Subsequent Event (Details) $ in Millions	Feb. 10, 2016 USD ($)
Subsequent Event [Member] | Chief Executive Officer [Member]
Subsequent Event [Line Items]
Defined Benefit Plan, Special Termination Benefits	$ 2.9

XML

Quarterly Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Revenues	$ 143,325	$ 150,744	$ 170,363	$ 161,034	$ 146,971	$ 153,015	$ 139,820	$ 146,667	$ 625,466		$ 586,473		$ 523,360
Operating income	20,055	31,993	37,471	30,575	37,148	37,422	31,836	25,206	120,094		131,612		141,910
Income from continuing operations	(1,430)	94,279	16,839	10,987	5,874	13,727	9,248	5,660	120,675		34,509		36,836
Discontinued operations	0	0	394	(238)	22	191	(198)	11	156		26		55,692
Net income	62,617	94,294	17,232	14,735	5,937	24,548	9,050	5,671	188,878		45,206		101,544
Net income attributable to noncontrolling interests	(3,253)	(4,494)	(1,451)	(1,380)	(1,033)	(1,828)	(1,160)	(930)
Net income	59,364	89,800	15,781	13,355	4,904	22,720	7,890	4,741	178,300		40,255		93,707
Preferred share/ unit dividends/ distributions	(3,553)	(3,552)	(3,553)	(3,552)	(3,552)	(3,553)	(4,344)	(4,490)	(14,210)		(15,939)		(19,971)
Issuance costs associated with redeemed preferred shares	0	0	0	0	0	0	(1,769)	0	0		(1,769)		(2,904)
Net income attributable to COPT common shareholders	$ 55,811	$ 86,248	$ 12,228	$ 9,803	$ 1,352	$ 19,167	$ 1,777	$ 251	$ 164,090		$ 22,547		$ 70,832
Basic earnings per common share/unit (in dollars per share/unit)	$ 0.59	$ 0.91	$ 0.13	$ 0.10	$ 0.01	$ 0.22	$ 0.02	$ 0.00	$ 1.74	[1]	$ 0.25	[1]	$ 0.83	[1]
Diluted earnings per common share/unit (in dollars per share/unit)	$ 0.59	$ 0.91	$ 0.13	$ 0.10	$ 0.01	$ 0.22	$ 0.02	$ 0.00	$ 1.74	[1]	$ 0.25	[1]	$ 0.83	[1]
Corporate Office Properties, L.P. [Member]
Revenues	$ 143,325	$ 150,744	$ 170,363	$ 161,034	$ 146,971	$ 153,015	$ 139,820	$ 146,667	$ 625,466		$ 586,473		$ 523,360
Operating income	20,055	31,993	37,471	30,575	37,148	37,422	31,836	25,206	120,094		131,612		141,910
Income from continuing operations	(1,430)	94,279	16,839	10,987	5,874	13,727	9,248	5,660	120,675		34,509		36,836
Discontinued operations	0	0	394	(238)	22	191	(198)	11	156		26		55,692
Net income	62,617	94,294	17,232	14,735	5,937	24,548	9,050	5,671	188,878		45,206		101,544
Net income attributable to noncontrolling interests	(918)	(972)	(812)	(818)	(805)	(897)	(837)	(737)	(3,520)		(3,276)		(3,907)
Net income	61,699	93,322	16,420	13,917	5,132	23,651	8,213	4,934	185,358		41,930		97,637
Preferred share/ unit dividends/ distributions	(3,718)	(3,717)	(3,718)	(3,717)	(3,717)	(3,718)	(4,509)	(4,655)	(14,870)		(16,599)		(20,631)
Issuance costs associated with redeemed preferred shares	0	0	0	0	0	0	(1,769)	0	0		(1,769)		(2,904)
Net income attributable to COPT common shareholders	$ 57,981	$ 89,605	$ 12,702	$ 10,200	$ 1,415	$ 19,933	$ 1,935	$ 279	$ 170,488		$ 23,562		$ 74,102
Basic earnings per common share/unit (in dollars per share/unit)	$ 0.59	$ 0.91	$ 0.13	$ 0.10	$ 0.01	$ 0.22	$ 0.02	$ 0.00	$ 1.74	[2]	$ 0.25	[2]	$ 0.83	[2]
Diluted earnings per common share/unit (in dollars per share/unit)	$ 0.59	$ 0.91	$ 0.13	$ 0.10	$ 0.01	$ 0.22	$ 0.02	$ 0.00	$ 1.74	[2]	$ 0.25	[2]	$ 0.83	[2]

[1] Basic and diluted earnings per common share are calculated based on amounts attributable to common shareholders of Corporate Office Properties Trust.

[2] Basic and diluted earnings per common unit are calculated based on amounts attributable to common unitholders of Corporate Office Properties, L.P.

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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts Receivables-Allowance for doubtful accounts [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 717	$ 2,976	$ 4,694
Charged to Costs and Expenses	1,125	278	(65)
Charged to Other Accounts	98	0	0
Deductions	(415)	(2,537)	(1,653)
Balance at End of Year	1,525	717	2,976
Allowance for Deferred Rent Receivable
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,418	2,126	913
Charged to Costs and Expenses	0	0	0
Charged to Other Accounts	544	(708)	1,213
Deductions	0	0	0
Balance at End of Year	1,962	1,418	2,126
Allowance for Deferred Tax Asset [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	2,062	2,062	207
Charged to Costs and Expenses	0	0	1,855
Charged to Other Accounts	0	0	0
Deductions	0	0	0
Balance at End of Year	$ 2,062	$ 2,062	$ 2,062

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Schedule III - Real Estate and Accumulated Depreciation (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Real Estate and Accumulated Depreciation
Encumbrances	$ 316,887,000
Initial Cost
Land	709,953,000
Building and Land Improvements	3,106,271,000
Costs Capitalized Subsequent to Acquisition	342,392,000
Gross Amounts Carried at Close of Period
Land	709,953,000
Building and Land Improvements	3,448,663,000
Total	4,158,616,000	$ 4,014,336,000	$ 3,811,950,000	$ 3,859,960,000
Accumulated Depreciation	(718,680,000)	(703,083,000)	(597,649,000)	$ (568,176,000)
Additional information
Debt excluded from encumbrances	2,077,752,000	1,914,036,000
Net discounts and deferred financing costs	19,500,000
Aggregate cost of assets for federal income tax purposes	3,500,000,000
Impairment losses	$ 23,289,000	1,416,000	$ 5,857,000
Buildings improvements [Member] | Minimum [Member]
Additional information
Estimated lives over which depreciation is recognized	10 years
Buildings improvements [Member] | Maximum [Member]
Additional information
Estimated lives over which depreciation is recognized	40 years
Revolving Credit Facility [Member]
Additional information
Debt excluded from encumbrances	$ 43,500,000	83,000,000
Term Loan Facilities [Member]
Additional information
Debt excluded from encumbrances	515,900,000	517,846,000
Unsecured Senior Notes [Member]
Additional information
Debt excluded from encumbrances	1,200,000,000
4.25% Exchangeable Senior Notes [Member]
Additional information
Debt excluded from encumbrances	0	572,000
Unsecured notes payable [Member]
Additional information
Debt excluded from encumbrances	1,500,000	1,607,000
Letter of Credit [Member]
Additional information
Debt excluded from encumbrances	14,800,000
Fixed rate mortgage loans [Member]
Additional information
Debt excluded from encumbrances	281,208,000	385,769,000
Net discounts and deferred financing costs	668,000
100 Light Street [Member]
Real Estate and Accumulated Depreciation
Encumbrances	50,732,000
Initial Cost
Land	26,715,000
Building and Land Improvements	58,343,000
Costs Capitalized Subsequent to Acquisition	55,000
Gross Amounts Carried at Close of Period
Land	26,715,000
Building and Land Improvements	58,398,000
Total	85,113,000
Accumulated Depreciation	(1,588,000)
1000 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	11,370,000
Initial Cost
Building and Land Improvements	20,533,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	20,533,000
Total	20,533,000
Accumulated Depreciation	(1,438,000)
1100 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	11,791,000
Initial Cost
Building and Land Improvements	19,593,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	19,593,000
Total	19,593,000
Accumulated Depreciation	(965,000)
114 National Business Parkway [Member]
Initial Cost
Land	364,000
Building and Land Improvements	3,109,000
Costs Capitalized Subsequent to Acquisition	60,000
Gross Amounts Carried at Close of Period
Land	364,000
Building and Land Improvements	3,169,000
Total	3,533,000
Accumulated Depreciation	(1,125,000)
11751 Meadowville Lane [Member]
Initial Cost
Land	1,305,000
Building and Land Improvements	52,098,000
Costs Capitalized Subsequent to Acquisition	112,000
Gross Amounts Carried at Close of Period
Land	1,305,000
Building and Land Improvements	52,210,000
Total	53,515,000
Accumulated Depreciation	(11,194,000)
1200 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	13,639,000
Initial Cost
Building and Land Improvements	22,389,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	22,389,000
Total	22,389,000
Accumulated Depreciation	(1,145,000)
1201 M Street [Member]
Initial Cost
Building and Land Improvements	49,785,000
Costs Capitalized Subsequent to Acquisition	4,225,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	54,010,000
Total	54,010,000
Accumulated Depreciation	(8,947,000)
1201 Winterson Road [Member]
Initial Cost
Land	1,288,000
Building and Land Improvements	12,175,000
Costs Capitalized Subsequent to Acquisition	460,000
Gross Amounts Carried at Close of Period
Land	1,288,000
Building and Land Improvements	12,635,000
Total	13,923,000
Accumulated Depreciation	(3,824,000)
1220 12th Street, SE [Member]
Initial Cost
Building and Land Improvements	42,464,000
Costs Capitalized Subsequent to Acquisition	2,431,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	44,895,000
Total	44,895,000
Accumulated Depreciation	(8,523,000)
1243 Winterson Road [Member]
Initial Cost
Land	630,000
Gross Amounts Carried at Close of Period
Land	630,000
Total	630,000
1302 Concourse Drive [Member]
Initial Cost
Land	2,078,000
Building and Land Improvements	8,313,000
Costs Capitalized Subsequent to Acquisition	6,559,000
Gross Amounts Carried at Close of Period
Land	2,078,000
Building and Land Improvements	14,872,000
Total	16,950,000
Accumulated Depreciation	(6,188,000)
1304 Concourse Drive [Member]
Initial Cost
Land	1,999,000
Building and Land Improvements	12,934,000
Costs Capitalized Subsequent to Acquisition	2,884,000
Gross Amounts Carried at Close of Period
Land	1,999,000
Building and Land Improvements	15,818,000
Total	17,817,000
Accumulated Depreciation	(6,360,000)
1306 Concourse Drive [Member]
Initial Cost
Land	2,796,000
Building and Land Improvements	11,186,000
Costs Capitalized Subsequent to Acquisition	8,152,000
Gross Amounts Carried at Close of Period
Land	2,796,000
Building and Land Improvements	19,338,000
Total	22,134,000
Accumulated Depreciation	(6,922,000)
131 National Business Parkway [Member]
Initial Cost
Land	1,906,000
Building and Land Improvements	7,623,000
Costs Capitalized Subsequent to Acquisition	3,524,000
Gross Amounts Carried at Close of Period
Land	1,906,000
Building and Land Improvements	11,147,000
Total	13,053,000
Accumulated Depreciation	(5,596,000)
132 National Business Parkway [Member]
Initial Cost
Land	2,917,000
Building and Land Improvements	12,259,000
Costs Capitalized Subsequent to Acquisition	3,005,000
Gross Amounts Carried at Close of Period
Land	2,917,000
Building and Land Improvements	15,264,000
Total	18,181,000
Accumulated Depreciation	(7,700,000)
133 National Business Parkway [Member]
Initial Cost
Land	2,517,000
Building and Land Improvements	10,068,000
Costs Capitalized Subsequent to Acquisition	5,204,000
Gross Amounts Carried at Close of Period
Land	2,517,000
Building and Land Improvements	15,272,000
Total	17,789,000
Accumulated Depreciation	(8,230,000)
1331 Ashton Road [Member]
Initial Cost
Land	587,000
Building and Land Improvements	2,347,000
Costs Capitalized Subsequent to Acquisition	1,575,000
Gross Amounts Carried at Close of Period
Land	587,000
Building and Land Improvements	3,922,000
Total	4,509,000
Accumulated Depreciation	(1,337,000)
1334 Ashton Road [Member]
Initial Cost
Land	736,000
Building and Land Improvements	1,488,000
Costs Capitalized Subsequent to Acquisition	2,639,000
Gross Amounts Carried at Close of Period
Land	736,000
Building and Land Improvements	4,127,000
Total	4,863,000
Accumulated Depreciation	(2,467,000)
134 National Business Parkway [Member]
Initial Cost
Land	3,684,000
Building and Land Improvements	7,517,000
Costs Capitalized Subsequent to Acquisition	3,496,000
Gross Amounts Carried at Close of Period
Land	3,684,000
Building and Land Improvements	11,013,000
Total	14,697,000
Accumulated Depreciation	(4,062,000)
1340 Ashton Road [Member]
Initial Cost
Land	905,000
Building and Land Improvements	3,620,000
Costs Capitalized Subsequent to Acquisition	1,469,000
Gross Amounts Carried at Close of Period
Land	905,000
Building and Land Improvements	5,089,000
Total	5,994,000
Accumulated Depreciation	(2,621,000)
1341 Ashton Road [Member]
Initial Cost
Land	306,000
Building and Land Improvements	1,223,000
Costs Capitalized Subsequent to Acquisition	604,000
Gross Amounts Carried at Close of Period
Land	306,000
Building and Land Improvements	1,827,000
Total	2,133,000
Accumulated Depreciation	(932,000)
1343 Ashton Road [Member]
Initial Cost
Land	193,000
Building and Land Improvements	774,000
Costs Capitalized Subsequent to Acquisition	405,000
Gross Amounts Carried at Close of Period
Land	193,000
Building and Land Improvements	1,179,000
Total	1,372,000
Accumulated Depreciation	(640,000)
13450 Sunrise Valley Road [Member]
Initial Cost
Land	1,386,000
Building and Land Improvements	5,576,000
Costs Capitalized Subsequent to Acquisition	3,335,000
Gross Amounts Carried at Close of Period
Land	1,386,000
Building and Land Improvements	8,911,000
Total	10,297,000
Accumulated Depreciation	(3,902,000)
13454 Sunrise Valley Road [Member]
Initial Cost
Land	2,899,000
Building and Land Improvements	11,986,000
Costs Capitalized Subsequent to Acquisition	6,750,000
Gross Amounts Carried at Close of Period
Land	2,899,000
Building and Land Improvements	18,736,000
Total	21,635,000
Accumulated Depreciation	(7,177,000)
135 National Business Parkway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	11,125,000
Initial Cost
Land	2,484,000
Building and Land Improvements	9,750,000
Costs Capitalized Subsequent to Acquisition	5,700,000
Gross Amounts Carried at Close of Period
Land	2,484,000
Building and Land Improvements	15,450,000
Total	17,934,000
Accumulated Depreciation	(6,467,000)
1362 Mellon Road [Member]
Initial Cost
Land	1,706,000
Building and Land Improvements	8,670,000
Costs Capitalized Subsequent to Acquisition	182,000
Gross Amounts Carried at Close of Period
Land	1,706,000
Building and Land Improvements	8,852,000
Total	10,558,000
Accumulated Depreciation	(1,517,000)
13857 McLearen Road [Member]
Initial Cost
Land	3,507,000
Building and Land Improvements	30,177,000
Costs Capitalized Subsequent to Acquisition	1,565,000
Gross Amounts Carried at Close of Period
Land	3,507,000
Building and Land Improvements	31,742,000
Total	35,249,000
Accumulated Depreciation	(6,961,000)
140 National Business Parkway [Member]
Initial Cost
Land	3,407,000
Building and Land Improvements	24,167,000
Costs Capitalized Subsequent to Acquisition	688,000
Gross Amounts Carried at Close of Period
Land	3,407,000
Building and Land Improvements	24,855,000
Total	28,262,000
Accumulated Depreciation	(7,647,000)
141 National Business Parkway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	11,566,000
Initial Cost
Land	2,398,000
Building and Land Improvements	9,590,000
Costs Capitalized Subsequent to Acquisition	3,194,000
Gross Amounts Carried at Close of Period
Land	2,398,000
Building and Land Improvements	12,784,000
Total	15,182,000
Accumulated Depreciation	(5,963,000)
14280 Park Meadow Drive [Member]
Initial Cost
Land	3,731,000
Building and Land Improvements	15,953,000
Costs Capitalized Subsequent to Acquisition	1,764,000
Gross Amounts Carried at Close of Period
Land	3,731,000
Building and Land Improvements	17,717,000
Total	21,448,000
Accumulated Depreciation	(6,185,000)
1460 Dorsey Road [Member]
Initial Cost
Land	1,800,000
Gross Amounts Carried at Close of Period
Land	1,800,000
Total	1,800,000
14840 Conference Center Drive [Member]
Initial Cost
Land	1,572,000
Building and Land Improvements	8,175,000
Costs Capitalized Subsequent to Acquisition	2,860,000
Gross Amounts Carried at Close of Period
Land	1,572,000
Building and Land Improvements	11,035,000
Total	12,607,000
Accumulated Depreciation	(4,320,000)
14850 Conference Center Drive [Member]
Initial Cost
Land	1,615,000
Building and Land Improvements	8,358,000
Costs Capitalized Subsequent to Acquisition	2,947,000
Gross Amounts Carried at Close of Period
Land	1,615,000
Building and Land Improvements	11,305,000
Total	12,920,000
Accumulated Depreciation	(4,646,000)
14900 Conference Center Drive [Member]
Initial Cost
Land	3,436,000
Building and Land Improvements	14,402,000
Costs Capitalized Subsequent to Acquisition	5,239,000
Gross Amounts Carried at Close of Period
Land	3,436,000
Building and Land Improvements	19,641,000
Total	23,077,000
Accumulated Depreciation	(8,221,000)
1501 South Clinton Street [Member]
Initial Cost
Land	27,964,000
Building and Land Improvements	52,146,000
Costs Capitalized Subsequent to Acquisition	8,165,000
Gross Amounts Carried at Close of Period
Land	27,964,000
Building and Land Improvements	60,311,000
Total	88,275,000
Accumulated Depreciation	(14,472,000)
15049 Conference Center Drive [Member]
Initial Cost
Land	4,415,000
Building and Land Improvements	20,365,000
Costs Capitalized Subsequent to Acquisition	3,619,000
Gross Amounts Carried at Close of Period
Land	4,415,000
Building and Land Improvements	23,984,000
Total	28,399,000
Accumulated Depreciation	(9,236,000)
15059 Conference Center Drive [Member]
Initial Cost
Land	5,753,000
Building and Land Improvements	13,615,000
Costs Capitalized Subsequent to Acquisition	2,065,000
Gross Amounts Carried at Close of Period
Land	5,753,000
Building and Land Improvements	15,680,000
Total	21,433,000
Accumulated Depreciation	(6,697,000)
15395 John Marshall Highway [Member]
Initial Cost
Land	2,465,000
Building and Land Improvements	24,768,000
Gross Amounts Carried at Close of Period
Land	2,465,000
Building and Land Improvements	24,768,000
Total	27,233,000
Accumulated Depreciation	(1,195,000)
1550 West Nursery Road [Member]
Initial Cost
Land	14,071,000
Building and Land Improvements	16,930,000
Gross Amounts Carried at Close of Period
Land	14,071,000
Building and Land Improvements	16,930,000
Total	31,001,000
Accumulated Depreciation	(3,626,000)
1560 West Nursery Road [Member]
Initial Cost
Land	1,441,000
Building and Land Improvements	113,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at Close of Period
Land	1,441,000
Building and Land Improvements	113,000
Total	1,554,000
Accumulated Depreciation	(5,000)
1560A Cable Ranch Road [Member]
Initial Cost
Land	1,097,000
Building and Land Improvements	3,770,000
Costs Capitalized Subsequent to Acquisition	394,000
Gross Amounts Carried at Close of Period
Land	1,097,000
Building and Land Improvements	4,164,000
Total	5,261,000
Accumulated Depreciation	(1,298,000)
1560B Cable Ranch Road [Member]
Initial Cost
Land	2,299,000
Building and Land Improvements	6,545,000
Costs Capitalized Subsequent to Acquisition	159,000
Gross Amounts Carried at Close of Period
Land	2,299,000
Building and Land Improvements	6,704,000
Total	9,003,000
Accumulated Depreciation	(1,738,000)
16442 Commerce Drive [Member]
Initial Cost
Land	613,000
Building and Land Improvements	2,582,000
Costs Capitalized Subsequent to Acquisition	883,000
Gross Amounts Carried at Close of Period
Land	613,000
Building and Land Improvements	3,465,000
Total	4,078,000
Accumulated Depreciation	(1,332,000)
16480 Commerce Drive [Member]
Initial Cost
Land	1,856,000
Building and Land Improvements	7,425,000
Costs Capitalized Subsequent to Acquisition	1,283,000
Gross Amounts Carried at Close of Period
Land	1,856,000
Building and Land Improvements	8,708,000
Total	10,564,000
Accumulated Depreciation	(2,316,000)
16501 Commerce Drive [Member]
Initial Cost
Land	522,000
Building and Land Improvements	2,090,000
Costs Capitalized Subsequent to Acquisition	482,000
Gross Amounts Carried at Close of Period
Land	522,000
Building and Land Improvements	2,572,000
Total	3,094,000
Accumulated Depreciation	(797,000)
16539 Commerce Drive [Member]
Initial Cost
Land	688,000
Building and Land Improvements	2,860,000
Costs Capitalized Subsequent to Acquisition	1,524,000
Gross Amounts Carried at Close of Period
Land	688,000
Building and Land Improvements	4,384,000
Total	5,072,000
Accumulated Depreciation	(1,934,000)
16541 Commerce Drive [Member]
Initial Cost
Land	773,000
Building and Land Improvements	3,094,000
Costs Capitalized Subsequent to Acquisition	1,368,000
Gross Amounts Carried at Close of Period
Land	773,000
Building and Land Improvements	4,462,000
Total	5,235,000
Accumulated Depreciation	(1,727,000)
16543 Commerce Drive [Member]
Initial Cost
Land	436,000
Building and Land Improvements	1,742,000
Costs Capitalized Subsequent to Acquisition	502,000
Gross Amounts Carried at Close of Period
Land	436,000
Building and Land Improvements	2,244,000
Total	2,680,000
Accumulated Depreciation	(573,000)
1751 Pinnacle Drive [Member]
Initial Cost
Land	10,486,000
Building and Land Improvements	42,339,000
Costs Capitalized Subsequent to Acquisition	24,059,000
Gross Amounts Carried at Close of Period
Land	10,486,000
Building and Land Improvements	66,398,000
Total	76,884,000
Accumulated Depreciation	(23,750,000)
1753 Pinnacle Drive [Member]
Initial Cost
Land	8,275,000
Building and Land Improvements	34,353,000
Costs Capitalized Subsequent to Acquisition	10,894,000
Gross Amounts Carried at Close of Period
Land	8,275,000
Building and Land Improvements	45,247,000
Total	53,522,000
Accumulated Depreciation	(15,849,000)
201 Technology Drive [Member]
Initial Cost
Land	726,000
Building and Land Improvements	31,091,000
Costs Capitalized Subsequent to Acquisition	59,000
Gross Amounts Carried at Close of Period
Land	726,000
Building and Land Improvements	31,150,000
Total	31,876,000
Accumulated Depreciation	(6,358,000)
206 Research Boulevard [Member]
Initial Cost
Land	1,813,000
Building and Land Improvements	17,485,000
Gross Amounts Carried at Close of Period
Land	1,813,000
Building and Land Improvements	17,485,000
Total	19,298,000
Accumulated Depreciation	(1,416,000)
209 Research Boulevard [Member]
Initial Cost
Land	1,045,000
Building and Land Improvements	16,087,000
Costs Capitalized Subsequent to Acquisition	79,000
Gross Amounts Carried at Close of Period
Land	1,045,000
Building and Land Improvements	16,166,000
Total	17,211,000
Accumulated Depreciation	(2,069,000)
210 Research Boulevard [Member]
Initial Cost
Land	1,065,000
Building and Land Improvements	15,102,000
Costs Capitalized Subsequent to Acquisition	75,000
Gross Amounts Carried at Close of Period
Land	1,065,000
Building and Land Improvements	15,177,000
Total	16,242,000
Accumulated Depreciation	(1,569,000)
2100 Rideout Road [Member]
Initial Cost
Land	0
Building and Land Improvements	2,586,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at Close of Period
Land	0
Building and Land Improvements	2,586,000
Total	2,586,000
2100 L Street [Member]
Initial Cost
Land	1,273,000
Building and Land Improvements	1,685,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at Close of Period
Land	1,273,000
Building and Land Improvements	1,685,000
Total	2,958,000
21267 Smith Switch Road [Member]
Initial Cost
Land	4,040,000
Building and Land Improvements	10,135,000
Gross Amounts Carried at Close of Period
Land	4,040,000
Building and Land Improvements	10,135,000
Total	14,175,000
Accumulated Depreciation	(365,000)
21271 Smith Switch Road [Member]
Initial Cost
Land	7,346,000
Building and Land Improvements	18,267,000
Gross Amounts Carried at Close of Period
Land	7,346,000
Building and Land Improvements	18,267,000
Total	25,613,000
Accumulated Depreciation	(881,000)
22289 Exploration Drive [Member]
Initial Cost
Land	1,422,000
Building and Land Improvements	5,719,000
Costs Capitalized Subsequent to Acquisition	1,660,000
Gross Amounts Carried at Close of Period
Land	1,422,000
Building and Land Improvements	7,379,000
Total	8,801,000
Accumulated Depreciation	(2,826,000)
22299 Exploration Drive [Member]
Initial Cost
Land	1,362,000
Building and Land Improvements	5,791,000
Costs Capitalized Subsequent to Acquisition	1,218,000
Gross Amounts Carried at Close of Period
Land	1,362,000
Building and Land Improvements	7,009,000
Total	8,371,000
Accumulated Depreciation	(2,641,000)
22300 Exploration Drive [Member]
Initial Cost
Land	1,094,000
Building and Land Improvements	5,038,000
Costs Capitalized Subsequent to Acquisition	1,315,000
Gross Amounts Carried at Close of Period
Land	1,094,000
Building and Land Improvements	6,353,000
Total	7,447,000
Accumulated Depreciation	(2,024,000)
22309 Exploration Drive [Member]
Initial Cost
Land	2,243,000
Building and Land Improvements	10,419,000
Costs Capitalized Subsequent to Acquisition	7,787,000
Gross Amounts Carried at Close of Period
Land	2,243,000
Building and Land Improvements	18,206,000
Total	20,449,000
Accumulated Depreciation	(4,683,000)
23535 Cottonwood Parkway [Member]
Initial Cost
Land	692,000
Building and Land Improvements	3,051,000
Costs Capitalized Subsequent to Acquisition	248,000
Gross Amounts Carried at Close of Period
Land	692,000
Building and Land Improvements	3,299,000
Total	3,991,000
Accumulated Depreciation	(1,206,000)
250 W Pratt St [Member]
Initial Cost
Land	8,057,000
Building and Land Improvements	34,654,000
Costs Capitalized Subsequent to Acquisition	4,765,000
Gross Amounts Carried at Close of Period
Land	8,057,000
Building and Land Improvements	39,419,000
Total	47,476,000
Accumulated Depreciation	(1,652,000)
2500 Riva Road [Member]
Initial Cost
Land	2,791,000
Building and Land Improvements	12,145,000
Costs Capitalized Subsequent to Acquisition	1,000
Gross Amounts Carried at Close of Period
Land	2,791,000
Building and Land Improvements	12,146,000
Total	14,937,000
Accumulated Depreciation	(4,417,000)
2600 Park Tower Drive [Member]
Initial Cost
Land	20,304,000
Building and Land Improvements	34,443,000
Costs Capitalized Subsequent to Acquisition	346,000
Gross Amounts Carried at Close of Period
Land	20,304,000
Building and Land Improvements	34,789,000
Total	55,093,000
Accumulated Depreciation	(1,051,000)
2691 Technology Drive [Member]
Initial Cost
Land	2,098,000
Building and Land Improvements	17,334,000
Costs Capitalized Subsequent to Acquisition	5,305,000
Gross Amounts Carried at Close of Period
Land	2,098,000
Building and Land Improvements	22,639,000
Total	24,737,000
Accumulated Depreciation	(7,827,000)
2701 Technology Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	22,053,000
Initial Cost
Land	1,737,000
Building and Land Improvements	15,266,000
Costs Capitalized Subsequent to Acquisition	2,821,000
Gross Amounts Carried at Close of Period
Land	1,737,000
Building and Land Improvements	18,087,000
Total	19,824,000
Accumulated Depreciation	(7,567,000)
2711 Technology Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	17,153,000
Initial Cost
Land	2,251,000
Building and Land Improvements	21,611,000
Costs Capitalized Subsequent to Acquisition	1,468,000
Gross Amounts Carried at Close of Period
Land	2,251,000
Building and Land Improvements	23,079,000
Total	25,330,000
Accumulated Depreciation	(10,158,000)
2720 Technology Drive [Member]
Initial Cost
Land	3,863,000
Building and Land Improvements	29,272,000
Costs Capitalized Subsequent to Acquisition	146,000
Gross Amounts Carried at Close of Period
Land	3,863,000
Building and Land Improvements	29,418,000
Total	33,281,000
Accumulated Depreciation	(8,316,000)
2721 Technology Drive [Member]
Initial Cost
Land	4,611,000
Building and Land Improvements	14,597,000
Costs Capitalized Subsequent to Acquisition	1,263,000
Gross Amounts Carried at Close of Period
Land	4,611,000
Building and Land Improvements	15,860,000
Total	20,471,000
Accumulated Depreciation	(6,400,000)
2730 Hercules Road [Member]
Real Estate and Accumulated Depreciation
Encumbrances	34,256,000
Initial Cost
Land	8,737,000
Building and Land Improvements	31,612,000
Costs Capitalized Subsequent to Acquisition	7,213,000
Gross Amounts Carried at Close of Period
Land	8,737,000
Building and Land Improvements	38,825,000
Total	47,562,000
Accumulated Depreciation	(15,674,000)
2900 Towerview Road [Member]
Initial Cost
Land	3,207,000
Building and Land Improvements	16,379,000
Costs Capitalized Subsequent to Acquisition	6,509,000
Gross Amounts Carried at Close of Period
Land	3,207,000
Building and Land Improvements	22,888,000
Total	26,095,000
Accumulated Depreciation	(7,181,000)
30 Light Street [Member]
Real Estate and Accumulated Depreciation
Encumbrances	4,268,000
Initial Cost
Land	0
Building and Land Improvements	12,101,000
Costs Capitalized Subsequent to Acquisition	37,000
Gross Amounts Carried at Close of Period
Land	0
Building and Land Improvements	12,138,000
Total	12,138,000
Accumulated Depreciation	(128,000)
300 Sentinel Drive [Member]
Initial Cost
Land	1,517,000
Building and Land Improvements	59,016,000
Costs Capitalized Subsequent to Acquisition	219,000
Gross Amounts Carried at Close of Period
Land	1,517,000
Building and Land Improvements	59,235,000
Total	60,752,000
Accumulated Depreciation	(8,458,000)
302 Sentinel Drive [Member]
Initial Cost
Land	2,648,000
Building and Land Improvements	29,687,000
Costs Capitalized Subsequent to Acquisition	445,000
Gross Amounts Carried at Close of Period
Land	2,648,000
Building and Land Improvements	30,132,000
Total	32,780,000
Accumulated Depreciation	(6,000,000)
304 Sentinel Drive [Member]
Initial Cost
Land	3,411,000
Building and Land Improvements	24,917,000
Costs Capitalized Subsequent to Acquisition	193,000
Gross Amounts Carried at Close of Period
Land	3,411,000
Building and Land Improvements	25,110,000
Total	28,521,000
Accumulated Depreciation	(6,304,000)
306 Sentinel Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	15,878,000
Initial Cost
Land	3,260,000
Building and Land Improvements	22,592,000
Costs Capitalized Subsequent to Acquisition	611,000
Gross Amounts Carried at Close of Period
Land	3,260,000
Building and Land Improvements	23,203,000
Total	26,463,000
Accumulated Depreciation	(5,269,000)
308 Sentinel Drive [Member]
Initial Cost
Land	1,422,000
Building and Land Improvements	26,208,000
Costs Capitalized Subsequent to Acquisition	37,000
Gross Amounts Carried at Close of Period
Land	1,422,000
Building and Land Improvements	26,245,000
Total	27,667,000
Accumulated Depreciation	(3,050,000)
310 Sentinel Way [Member]
Initial Cost
Land	2,372,000
Building and Land Improvements	36,468,000
Gross Amounts Carried at Close of Period
Land	2,372,000
Building and Land Improvements	36,468,000
Total	38,840,000
Accumulated Depreciation	(191,000)
310 The Bridge Street [Member]
Initial Cost
Land	261,000
Building and Land Improvements	26,531,000
Costs Capitalized Subsequent to Acquisition	1,695,000
Gross Amounts Carried at Close of Period
Land	261,000
Building and Land Improvements	28,226,000
Total	28,487,000
Accumulated Depreciation	(5,136,000)
312 Sentinel Way [Member]
Initial Cost
Land	3,138,000
Building and Land Improvements	27,789,000
Gross Amounts Carried at Close of Period
Land	3,138,000
Building and Land Improvements	27,789,000
Total	30,927,000
Accumulated Depreciation	(913,000)
3120 Fairview Park Drive [Member]
Initial Cost
Land	6,863,000
Building and Land Improvements	35,606,000
Costs Capitalized Subsequent to Acquisition	8,773,000
Gross Amounts Carried at Close of Period
Land	6,863,000
Building and Land Improvements	44,379,000
Total	51,242,000
Accumulated Depreciation	(7,229,000)
314 Sentinel Way [Member]
Initial Cost
Land	1,254,000
Building and Land Improvements	1,439,000
Gross Amounts Carried at Close of Period
Land	1,254,000
Building and Land Improvements	1,439,000
Total	2,693,000
Accumulated Depreciation	(249,000)
316 Sentinel Way [Member]
Initial Cost
Land	2,748,000
Building and Land Improvements	38,156,000
Costs Capitalized Subsequent to Acquisition	138,000
Gross Amounts Carried at Close of Period
Land	2,748,000
Building and Land Improvements	38,294,000
Total	41,042,000
Accumulated Depreciation	(3,570,000)
318 Sentinel Way [Member]
Initial Cost
Land	2,185,000
Building and Land Improvements	28,426,000
Gross Amounts Carried at Close of Period
Land	2,185,000
Building and Land Improvements	28,426,000
Total	30,611,000
Accumulated Depreciation	(6,981,000)
320 Sentinel Way [Member]
Initial Cost
Land	2,067,000
Building and Land Improvements	21,623,000
Gross Amounts Carried at Close of Period
Land	2,067,000
Building and Land Improvements	21,623,000
Total	23,690,000
Accumulated Depreciation	(4,310,000)
322 Sentinel Way [Member]
Real Estate and Accumulated Depreciation
Encumbrances	21,122,000
Initial Cost
Land	2,605,000
Building and Land Improvements	22,827,000
Gross Amounts Carried at Close of Period
Land	2,605,000
Building and Land Improvements	22,827,000
Total	25,432,000
Accumulated Depreciation	(5,143,000)
324 Sentinel Way [Member]
Initial Cost
Land	1,656,000
Building and Land Improvements	23,018,000
Gross Amounts Carried at Close of Period
Land	1,656,000
Building and Land Improvements	23,018,000
Total	24,674,000
Accumulated Depreciation	(3,078,000)
410 National Business Parkway [Member]
Initial Cost
Land	1,831,000
Building and Land Improvements	23,257,000
Costs Capitalized Subsequent to Acquisition	112,000
Gross Amounts Carried at Close of Period
Land	1,831,000
Building and Land Improvements	23,369,000
Total	25,200,000
Accumulated Depreciation	(1,719,000)
420 National Business Parkway [Member]
Initial Cost
Land	2,370,000
Building and Land Improvements	27,490,000
Costs Capitalized Subsequent to Acquisition	106,000
Gross Amounts Carried at Close of Period
Land	2,370,000
Building and Land Improvements	27,596,000
Total	29,966,000
Accumulated Depreciation	(1,230,000)
430 National Business Parkway [Member]
Initial Cost
Land	1,852,000
Building and Land Improvements	21,153,000
Costs Capitalized Subsequent to Acquisition	119,000
Gross Amounts Carried at Close of Period
Land	1,852,000
Building and Land Improvements	21,272,000
Total	23,124,000
Accumulated Depreciation	(2,034,000)
44408 Pecan Court [Member]
Initial Cost
Land	817,000
Building and Land Improvements	1,583,000
Costs Capitalized Subsequent to Acquisition	581,000
Gross Amounts Carried at Close of Period
Land	817,000
Building and Land Improvements	2,164,000
Total	2,981,000
Accumulated Depreciation	(560,000)
44414 Pecan Court [Member]
Initial Cost
Land	405,000
Building and Land Improvements	1,619,000
Costs Capitalized Subsequent to Acquisition	337,000
Gross Amounts Carried at Close of Period
Land	405,000
Building and Land Improvements	1,956,000
Total	2,361,000
Accumulated Depreciation	(725,000)
44417 Pecan Court [Member]
Initial Cost
Land	434,000
Building and Land Improvements	3,348,000
Costs Capitalized Subsequent to Acquisition	88,000
Gross Amounts Carried at Close of Period
Land	434,000
Building and Land Improvements	3,436,000
Total	3,870,000
Accumulated Depreciation	(1,127,000)
44420 Pecan Court [Member]
Initial Cost
Land	344,000
Building and Land Improvements	890,000
Costs Capitalized Subsequent to Acquisition	148,000
Gross Amounts Carried at Close of Period
Land	344,000
Building and Land Improvements	1,038,000
Total	1,382,000
Accumulated Depreciation	(255,000)
44425 Pecan Court [Member]
Initial Cost
Land	1,309,000
Building and Land Improvements	3,506,000
Costs Capitalized Subsequent to Acquisition	1,590,000
Gross Amounts Carried at Close of Period
Land	1,309,000
Building and Land Improvements	5,096,000
Total	6,405,000
Accumulated Depreciation	(1,784,000)
45310 Abell House Lane [Member]
Initial Cost
Land	2,272,000
Building and Land Improvements	13,808,000
Gross Amounts Carried at Close of Period
Land	2,272,000
Building and Land Improvements	13,808,000
Total	16,080,000
Accumulated Depreciation	(1,403,000)
46579 Expedition Drive [Member]
Initial Cost
Land	1,406,000
Building and Land Improvements	5,796,000
Costs Capitalized Subsequent to Acquisition	1,335,000
Gross Amounts Carried at Close of Period
Land	1,406,000
Building and Land Improvements	7,131,000
Total	8,537,000
Accumulated Depreciation	(3,060,000)
46591 Expedition Drive [Member]
Initial Cost
Land	1,200,000
Building and Land Improvements	7,199,000
Costs Capitalized Subsequent to Acquisition	1,134,000
Gross Amounts Carried at Close of Period
Land	1,200,000
Building and Land Improvements	8,333,000
Total	9,533,000
Accumulated Depreciation	(1,933,000)
4851 Stonecroft Boulevard [Member]
Initial Cost
Land	1,878,000
Building and Land Improvements	11,558,000
Costs Capitalized Subsequent to Acquisition	21,000
Gross Amounts Carried at Close of Period
Land	1,878,000
Building and Land Improvements	11,579,000
Total	13,457,000
Accumulated Depreciation	(3,248,000)
4940 Campbell Drive [Member]
Initial Cost
Land	1,379,000
Building and Land Improvements	2,728,000
Costs Capitalized Subsequent to Acquisition	1,464,000
Gross Amounts Carried at Close of Period
Land	1,379,000
Building and Land Improvements	4,192,000
Total	5,571,000
Accumulated Depreciation	(445,000)
525 Babcock Road [Member]
Initial Cost
Land	355,000
Building and Land Improvements	397,000
Costs Capitalized Subsequent to Acquisition	79,000
Gross Amounts Carried at Close of Period
Land	355,000
Building and Land Improvements	476,000
Total	831,000
Accumulated Depreciation	(173,000)
5325 Nottingham Drive [Member]
Initial Cost
Land	816,000
Building and Land Improvements	3,976,000
Costs Capitalized Subsequent to Acquisition	485,000
Gross Amounts Carried at Close of Period
Land	816,000
Building and Land Improvements	4,461,000
Total	5,277,000
Accumulated Depreciation	(1,233,000)
5355 Nottingham Drive [Member]
Initial Cost
Land	761,000
Building and Land Improvements	3,562,000
Costs Capitalized Subsequent to Acquisition	1,758,000
Gross Amounts Carried at Close of Period
Land	761,000
Building and Land Improvements	5,320,000
Total	6,081,000
Accumulated Depreciation	(2,132,000)
540 National Business Parkway [Member]
Initial Cost
Land	2,035,000
Building and Land Improvements	9,496,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at Close of Period
Land	2,035,000
Building and Land Improvements	9,496,000
Total	11,531,000
Accumulated Depreciation	0
5520 Research Park Drive [Member]
Initial Cost
Building and Land Improvements	20,072,000
Costs Capitalized Subsequent to Acquisition	201,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	20,273,000
Total	20,273,000
Accumulated Depreciation	(3,195,000)
5522 Research Park Drive [Member]
Initial Cost
Building and Land Improvements	4,550,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	4,550,000
Total	4,550,000
Accumulated Depreciation	(955,000)
5825 University Research Court [Member]
Real Estate and Accumulated Depreciation
Encumbrances	15,255,000
Initial Cost
Building and Land Improvements	22,740,000
Costs Capitalized Subsequent to Acquisition	87,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	22,827,000
Total	22,827,000
Accumulated Depreciation	(3,817,000)
5850 University Research Court [Member]
Real Estate and Accumulated Depreciation
Encumbrances	20,771,000
Initial Cost
Building and Land Improvements	31,906,000
Costs Capitalized Subsequent to Acquisition	406,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	32,312,000
Total	32,312,000
Accumulated Depreciation	(4,580,000)
6700 Alexander Bell Drive [Member]
Initial Cost
Land	1,755,000
Building and Land Improvements	7,019,000
Costs Capitalized Subsequent to Acquisition	6,226,000
Gross Amounts Carried at Close of Period
Land	1,755,000
Building and Land Improvements	13,245,000
Total	15,000,000
Accumulated Depreciation	(5,913,000)
6708 Alexander Bell Drive [Member]
Initial Cost
Land	897,000
Building and Land Improvements	8,844,000
Costs Capitalized Subsequent to Acquisition	1,591,000
Gross Amounts Carried at Close of Period
Land	897,000
Building and Land Improvements	10,435,000
Total	11,332,000
Accumulated Depreciation		(3,414,000)
6711 Columbia Gateway Drive [Member]
Initial Cost
Land	2,683,000
Building and Land Improvements	23,239,000
Costs Capitalized Subsequent to Acquisition	619,000
Gross Amounts Carried at Close of Period
Land	2,683,000
Building and Land Improvements	23,858,000
Total	26,541,000
Accumulated Depreciation		(5,407,000)
6716 Alexander Bell Drive [Member]
Initial Cost
Land	1,242,000
Building and Land Improvements	4,969,000
Costs Capitalized Subsequent to Acquisition	3,352,000
Gross Amounts Carried at Close of Period
Land	1,242,000
Building and Land Improvements	8,321,000
Total	9,563,000
Accumulated Depreciation		(4,359,000)
6721 Columbia Gateway Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	16,663,000
Initial Cost
Land	1,753,000
Building and Land Improvements	34,090,000
Costs Capitalized Subsequent to Acquisition	76,000
Gross Amounts Carried at Close of Period
Land	1,753,000
Building and Land Improvements	34,166,000
Total	35,919,000
Accumulated Depreciation		(5,798,000)
6724 Alexander Bell Drive [Member]
Initial Cost
Land	449,000
Building and Land Improvements	5,039,000
Costs Capitalized Subsequent to Acquisition	708,000
Gross Amounts Carried at Close of Period
Land	449,000
Building and Land Improvements	5,747,000
Total	6,196,000
Accumulated Depreciation		(2,266,000)
6731 Columbia Gateway Drive [Member]
Initial Cost
Land	2,807,000
Building and Land Improvements	19,098,000
Costs Capitalized Subsequent to Acquisition	2,916,000
Gross Amounts Carried at Close of Period
Land	2,807,000
Building and Land Improvements	22,014,000
Total	24,821,000
Accumulated Depreciation		(8,494,000)
6740 Alexander Bell Drive [Member]
Initial Cost
Land	1,424,000
Building and Land Improvements	5,696,000
Costs Capitalized Subsequent to Acquisition	3,340,000
Gross Amounts Carried at Close of Period
Land	1,424,000
Building and Land Improvements	9,036,000
Total	10,460,000
Accumulated Depreciation		(5,058,000)
6741 Columbia Gateway Drive [Member]
Initial Cost
Land	675,000
Building and Land Improvements	1,711,000
Costs Capitalized Subsequent to Acquisition	124,000
Gross Amounts Carried at Close of Period
Land	675,000
Building and Land Improvements	1,835,000
Total	2,510,000
Accumulated Depreciation		(357,000)
6750 Alexander Bell Drive [Member]
Initial Cost
Land	1,263,000
Building and Land Improvements	12,461,000
Costs Capitalized Subsequent to Acquisition	3,457,000
Gross Amounts Carried at Close of Period
Land	1,263,000
Building and Land Improvements	15,918,000
Total	17,181,000
Accumulated Depreciation		(7,576,000)
6760 Alexander Bell Drive [Member]
Initial Cost
Land	890,000
Building and Land Improvements	3,561,000
Costs Capitalized Subsequent to Acquisition	2,974,000
Gross Amounts Carried at Close of Period
Land	890,000
Building and Land Improvements	6,535,000
Total	7,425,000
Accumulated Depreciation		(3,248,000)
6940 Columbia Gateway Drive [Member]
Initial Cost
Land	3,545,000
Building and Land Improvements	9,916,000
Costs Capitalized Subsequent to Acquisition	5,537,000
Gross Amounts Carried at Close of Period
Land	3,545,000
Building and Land Improvements	15,453,000
Total	18,998,000
Accumulated Depreciation		(7,000,000)
6950 Columbia Gateway Drive [Member]
Initial Cost
Land	3,596,000
Building and Land Improvements	14,269,000
Costs Capitalized Subsequent to Acquisition	3,087,000
Gross Amounts Carried at Close of Period
Land	3,596,000
Building and Land Improvements	17,356,000
Total	20,952,000
Accumulated Depreciation		(7,506,000)
7000 Columbia Gateway Drive [Member]
Initial Cost
Land	3,131,000
Building and Land Improvements	12,103,000
Costs Capitalized Subsequent to Acquisition	2,138,000
Gross Amounts Carried at Close of Period
Land	3,131,000
Building and Land Improvements	14,241,000
Total	17,372,000
Accumulated Depreciation		(4,482,000)
7005 Columbia Gateway Drive [Member]
Initial Cost
Land	3,036,000
Building and Land Improvements	189,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at Close of Period
Land	3,036,000
Building and Land Improvements	189,000
Total	3,225,000
Accumulated Depreciation		0
7015 Albert Einstein Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	1,570,000
Initial Cost
Land	2,058,000
Building and Land Improvements	6,093,000
Costs Capitalized Subsequent to Acquisition	1,527,000
Gross Amounts Carried at Close of Period
Land	2,058,000
Building and Land Improvements	7,620,000
Total	9,678,000
Accumulated Depreciation		(2,915,000)
7061 Columbia Gateway Drive [Member]
Initial Cost
Land	729,000
Building and Land Improvements	3,094,000
Costs Capitalized Subsequent to Acquisition	1,407,000
Gross Amounts Carried at Close of Period
Land	729,000
Building and Land Improvements	4,501,000
Total	5,230,000
Accumulated Depreciation		(1,802,000)
7063 Columbia Gateway Drive [Member]
Initial Cost
Land	902,000
Building and Land Improvements	3,684,000
Costs Capitalized Subsequent to Acquisition	2,512,000
Gross Amounts Carried at Close of Period
Land	902,000
Building and Land Improvements	6,196,000
Total	7,098,000
Accumulated Depreciation		(2,452,000)
7065 Columbia Gateway Drive [Member]
Initial Cost
Land	919,000
Building and Land Improvements	3,763,000
Costs Capitalized Subsequent to Acquisition	3,095,000
Gross Amounts Carried at Close of Period
Land	919,000
Building and Land Improvements	6,858,000
Total	7,777,000
Accumulated Depreciation		(2,773,000)
7067 Columbia Gateway Drive [Member]
Initial Cost
Land	1,829,000
Building and Land Improvements	11,823,000
Costs Capitalized Subsequent to Acquisition	2,838,000
Gross Amounts Carried at Close of Period
Land	1,829,000
Building and Land Improvements	14,661,000
Total	16,490,000
Accumulated Depreciation		(6,154,000)
7125 Columbia Gateway Drive [Member]
Initial Cost
Land	3,361,000
Building and Land Improvements	1,677,000
Costs Capitalized Subsequent to Acquisition	279,000
Gross Amounts Carried at Close of Period
Land	3,361,000
Building and Land Improvements	1,956,000
Total	5,317,000
7125 Columbia Gateway Drive [Member]
Initial Cost
Land	17,126,000
Building and Land Improvements	46,994,000
Costs Capitalized Subsequent to Acquisition	9,813,000
Gross Amounts Carried at Close of Period
Land	17,126,000
Building and Land Improvements	56,807,000
Total	73,933,000
Accumulated Depreciation		(16,632,000)
7130 Columbia Gateway Drive [Member]
Initial Cost
Land	1,350,000
Building and Land Improvements	4,359,000
Costs Capitalized Subsequent to Acquisition	1,906,000
Gross Amounts Carried at Close of Period
Land	1,350,000
Building and Land Improvements	6,265,000
Total	7,615,000
Accumulated Depreciation		(2,692,000)
7134 Columbia Gateway Drive [Member]
Initial Cost
Land	704,000
Building and Land Improvements	2,139,000
Costs Capitalized Subsequent to Acquisition	314,000
Gross Amounts Carried at Close of Period
Land	704,000
Building and Land Improvements	2,453,000
Total	3,157,000
Accumulated Depreciation		(1,234,000)
7138 Columbia Gateway Drive [Member]
Initial Cost
Land	1,104,000
Building and Land Improvements	3,518,000
Costs Capitalized Subsequent to Acquisition	2,118,000
Gross Amounts Carried at Close of Period
Land	1,104,000
Building and Land Improvements	5,636,000
Total	6,740,000
Accumulated Depreciation		(3,139,000)
7142 Columbia Gateway Drive [Member]
Initial Cost
Land	1,342,000
Building and Land Improvements	3,978,000
Costs Capitalized Subsequent to Acquisition	2,502,000
Gross Amounts Carried at Close of Period
Land	1,342,000
Building and Land Improvements	6,480,000
Total	7,822,000
Accumulated Depreciation		(2,322,000)
7150 Columbia Gateway Drive [Member]
Initial Cost
Land	1,032,000
Building and Land Improvements	3,429,000
Costs Capitalized Subsequent to Acquisition	665,000
Gross Amounts Carried at Close of Period
Land	1,032,000
Building and Land Improvements	4,094,000
Total	5,126,000
Accumulated Depreciation		(1,170,000)
7150 Riverwood Drive [Member]
Initial Cost
Land	1,821,000
Building and Land Improvements	4,388,000
Costs Capitalized Subsequent to Acquisition	1,713,000
Gross Amounts Carried at Close of Period
Land	1,821,000
Building and Land Improvements	6,101,000
Total	7,922,000
Accumulated Depreciation		(1,933,000)
7160 Riverwood Drive [Member]
Initial Cost
Land	2,732,000
Building and Land Improvements	7,006,000
Costs Capitalized Subsequent to Acquisition	2,275,000
Gross Amounts Carried at Close of Period
Land	2,732,000
Building and Land Improvements	9,281,000
Total	12,013,000
Accumulated Depreciation		(3,265,000)
7170 Riverwood Drive [Member]
Initial Cost
Land	1,283,000
Building and Land Improvements	3,096,000
Costs Capitalized Subsequent to Acquisition	692,000
Gross Amounts Carried at Close of Period
Land	1,283,000
Building and Land Improvements	3,788,000
Total	5,071,000
Accumulated Depreciation		(1,386,000)
7175 Riverwood Drive [Member]
Initial Cost
Land	1,788,000
Building and Land Improvements	7,269,000
Gross Amounts Carried at Close of Period
Land	1,788,000
Building and Land Improvements	7,269,000
Total	9,057,000
Accumulated Depreciation		(389,000)
7200 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	6,649,000
Initial Cost
Land	0
Building and Land Improvements	8,347,000
Gross Amounts Carried at Close of Period
Land	0
Building and Land Improvements	8,347,000
Total	8,347,000
Accumulated Depreciation		(328,000)
7200 Riverwood Road [Member]
Initial Cost
Land	4,089,000
Building and Land Improvements	22,544,000
Costs Capitalized Subsequent to Acquisition	3,994,000
Gross Amounts Carried at Close of Period
Land	4,089,000
Building and Land Improvements	26,538,000
Total	30,627,000
Accumulated Depreciation		(8,761,000)
7205 Riverwood Drive [Member]
Initial Cost
Land	1,367,000
Building and Land Improvements	21,484,000
Gross Amounts Carried at Close of Period
Land	1,367,000
Building and Land Improvements	21,484,000
Total	22,851,000
Accumulated Depreciation		(1,310,000)
7272 Park Circle Drive [Member]
Real Estate and Accumulated Depreciation
Encumbrances	4,747,000
Initial Cost
Land	1,479,000
Building and Land Improvements	6,300,000
Costs Capitalized Subsequent to Acquisition	3,883,000
Gross Amounts Carried at Close of Period
Land	1,479,000
Building and Land Improvements	10,183,000
Total	11,662,000
Accumulated Depreciation		(2,956,000)
7318 Parkway Drive [Member]
Initial Cost
Land	972,000
Building and Land Improvements	3,888,000
Costs Capitalized Subsequent to Acquisition	1,002,000
Gross Amounts Carried at Close of Period
Land	972,000
Building and Land Improvements	4,890,000
Total	5,862,000
Accumulated Depreciation		(2,084,000)
7320 Parkway Drive [Member]
Initial Cost
Land	905,000
Building and Land Improvements	3,570,000
Costs Capitalized Subsequent to Acquisition	5,048,000
Gross Amounts Carried at Close of Period
Land	905,000
Building and Land Improvements	8,618,000
Total	9,523,000
Accumulated Depreciation		(2,883,000)
7400 Redstone Gateway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	7,292,000
Initial Cost
Land	0
Building and Land Improvements	9,012,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at Close of Period
Land	0
Building and Land Improvements	9,012,000
Total	9,012,000
Accumulated Depreciation		(121,000)
7467 Ridge Road [Member]
Initial Cost
Land	1,629,000
Building and Land Improvements	6,517,000
Costs Capitalized Subsequent to Acquisition	3,645,000
Gross Amounts Carried at Close of Period
Land	1,629,000
Building and Land Improvements	10,162,000
Total	11,791,000
Accumulated Depreciation		(4,439,000)
7740 Milestone Parkway [Member]
Real Estate and Accumulated Depreciation
Encumbrances	18,987,000
Initial Cost
Land	3,825,000
Building and Land Improvements	34,176,000
Costs Capitalized Subsequent to Acquisition	404,000
Gross Amounts Carried at Close of Period
Land	3,825,000
Building and Land Improvements	34,580,000
Total	38,405,000
Accumulated Depreciation	(4,692,000)
7770 Backlick Road [Member]
Initial Cost
Land	6,387,000
Building and Land Improvements	74,325,000
Costs Capitalized Subsequent to Acquisition	141,000
Gross Amounts Carried at Close of Period
Land	6,387,000
Building and Land Improvements	74,466,000
Total	80,853,000
Accumulated Depreciation	(5,292,000)
7880 Milestone Parkway [Member]
Initial Cost
Land	4,857,000
Building and Land Improvements	23,647,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at Close of Period
Land	4,857,000
Building and Land Improvements	23,647,000
Total	28,504,000
Accumulated Depreciation	(215,000)
8003 Corporate Drive [Member]
Initial Cost
Land	611,000
Building and Land Improvements	1,126,000
Costs Capitalized Subsequent to Acquisition	685,000
Gross Amounts Carried at Close of Period
Land	611,000
Building and Land Improvements	1,811,000
Total	2,422,000
Accumulated Depreciation	(99,000)
8007 Corporate Drive [Member]
Initial Cost
Land	1,434,000
Building and Land Improvements	350,000
Costs Capitalized Subsequent to Acquisition	1,218,000
Gross Amounts Carried at Close of Period
Land	1,434,000
Building and Land Improvements	1,568,000
Total	3,002,000
Accumulated Depreciation	(278,000)
8010 Corporate Drive [Member]
Initial Cost
Land	1,349,000
Building and Land Improvements	3,262,000
Costs Capitalized Subsequent to Acquisition	1,744,000
Gross Amounts Carried at Close of Period
Land	1,349,000
Building and Land Improvements	5,006,000
Total	6,355,000
Accumulated Depreciation	(1,448,000)
8013 Corporate Drive [Member]
Initial Cost
Land	642,000
Building and Land Improvements	1,072,000
Costs Capitalized Subsequent to Acquisition	1,808,000
Gross Amounts Carried at Close of Period
Land	642,000
Building and Land Improvements	2,880,000
Total	3,522,000
Accumulated Depreciation	(519,000)
8015 Corporate Drive [Member]
Initial Cost
Land	446,000
Building and Land Improvements	1,116,000
Costs Capitalized Subsequent to Acquisition	466,000
Gross Amounts Carried at Close of Period
Land	446,000
Building and Land Improvements	1,582,000
Total	2,028,000
Accumulated Depreciation	(468,000)
8019 Corporate Drive [Member]
Initial Cost
Land	680,000
Building and Land Improvements	1,898,000
Costs Capitalized Subsequent to Acquisition	825,000
Gross Amounts Carried at Close of Period
Land	680,000
Building and Land Improvements	2,723,000
Total	3,403,000
Accumulated Depreciation	(827,000)
8020 Corporate Drive [Member]
Initial Cost
Land	2,184,000
Building and Land Improvements	3,767,000
Costs Capitalized Subsequent to Acquisition	2,205,000
Gross Amounts Carried at Close of Period
Land	2,184,000
Building and Land Improvements	5,972,000
Total	8,156,000
Accumulated Depreciation	(1,703,000)
8023 Corporate Drive [Member]
Initial Cost
Land	651,000
Building and Land Improvements	1,164,000
Costs Capitalized Subsequent to Acquisition	5,000
Gross Amounts Carried at Close of Period
Land	651,000
Building and Land Improvements	1,169,000
Total	1,820,000
Accumulated Depreciation	(47,000)
8094 Sandpiper Circle [Member]
Initial Cost
Land	1,960,000
Building and Land Improvements	3,716,000
Costs Capitalized Subsequent to Acquisition	1,129,000
Gross Amounts Carried at Close of Period
Land	1,960,000
Building and Land Improvements	4,845,000
Total	6,805,000
Accumulated Depreciation	(1,267,000)
8098 Sandpiper Circle [Member]
Initial Cost
Land	1,797,000
Building and Land Improvements	3,651,000
Costs Capitalized Subsequent to Acquisition	639,000
Gross Amounts Carried at Close of Period
Land	1,797,000
Building and Land Improvements	4,290,000
Total	6,087,000
Accumulated Depreciation	(929,000)
8110 Corporate Drive [Member]
Initial Cost
Land	2,285,000
Building and Land Improvements	10,117,000
Costs Capitalized Subsequent to Acquisition	989,000
Gross Amounts Carried at Close of Period
Land	2,285,000
Building and Land Improvements	11,106,000
Total	13,391,000
Accumulated Depreciation	(3,133,000)
8140 Corporate Drive [Member]
Initial Cost
Land	2,158,000
Building and Land Improvements	8,457,000
Costs Capitalized Subsequent to Acquisition	3,163,000
Gross Amounts Carried at Close of Period
Land	2,158,000
Building and Land Improvements	11,620,000
Total	13,778,000
Accumulated Depreciation	(4,117,000)
8621 Robert Fulton Drive [Member]
Initial Cost
Land	2,317,000
Building and Land Improvements	12,642,000
Costs Capitalized Subsequent to Acquisition	344,000
Gross Amounts Carried at Close of Period
Land	2,317,000
Building and Land Improvements	12,986,000
Total	15,303,000
Accumulated Depreciation	(3,378,000)
8661 Robert Fulton Drive [Member]
Initial Cost
Land	1,510,000
Building and Land Improvements	3,764,000
Costs Capitalized Subsequent to Acquisition	2,420,000
Gross Amounts Carried at Close of Period
Land	1,510,000
Building and Land Improvements	6,184,000
Total	7,694,000
Accumulated Depreciation	(2,117,000)
8671 Robert Fulton Drive [Member]
Initial Cost
Land	1,718,000
Building and Land Improvements	4,280,000
Costs Capitalized Subsequent to Acquisition	3,931,000
Gross Amounts Carried at Close of Period
Land	1,718,000
Building and Land Improvements	8,211,000
Total	9,929,000
Accumulated Depreciation	(3,060,000)
870 Elkridge Landing Road [Member]
Initial Cost
Land	2,003,000
Building and Land Improvements	9,442,000
Costs Capitalized Subsequent to Acquisition	7,616,000
Gross Amounts Carried at Close of Period
Land	2,003,000
Building and Land Improvements	17,058,000
Total	19,061,000
Accumulated Depreciation	(8,411,000)
891 Elkridge Landing Road [Member]
Initial Cost
Land	1,165,000
Building and Land Improvements	4,772,000
Costs Capitalized Subsequent to Acquisition	2,928,000
Gross Amounts Carried at Close of Period
Land	1,165,000
Building and Land Improvements	7,700,000
Total	8,865,000
Accumulated Depreciation	(3,488,000)
900 Elkridge Landing Road [Member]
Initial Cost
Land	1,993,000
Building and Land Improvements	7,972,000
Costs Capitalized Subsequent to Acquisition	3,603,000
Gross Amounts Carried at Close of Period
Land	1,993,000
Building and Land Improvements	11,575,000
Total	13,568,000
Accumulated Depreciation	(6,009,000)
901 Elkridge Landing Road [Member]
Initial Cost
Land	1,156,000
Building and Land Improvements	4,437,000
Costs Capitalized Subsequent to Acquisition	2,390,000
Gross Amounts Carried at Close of Period
Land	1,156,000
Building and Land Improvements	6,827,000
Total	7,983,000
Accumulated Depreciation	(3,015,000)
911 Elkridge Landing Road [Member]
Initial Cost
Land	1,215,000
Building and Land Improvements	4,861,000
Costs Capitalized Subsequent to Acquisition	2,024,000
Gross Amounts Carried at Close of Period
Land	1,215,000
Building and Land Improvements	6,885,000
Total	8,100,000
Accumulated Depreciation	(3,462,000)
921 Elkridge Landing Road [Member]
Initial Cost
Land	1,044,000
Building and Land Improvements	4,727,000
Costs Capitalized Subsequent to Acquisition	748,000
Gross Amounts Carried at Close of Period
Land	1,044,000
Building and Land Improvements	5,475,000
Total	6,519,000
Accumulated Depreciation	(4,924,000)
938 Elkridge Landing Road [Member]
Initial Cost
Land	922,000
Building and Land Improvements	4,748,000
Costs Capitalized Subsequent to Acquisition	1,263,000
Gross Amounts Carried at Close of Period
Land	922,000
Building and Land Improvements	6,011,000
Total	6,933,000
Accumulated Depreciation	(2,116,000)
939 Elkridge Landing Road [Member]
Initial Cost
Land	939,000
Building and Land Improvements	3,756,000
Costs Capitalized Subsequent to Acquisition	4,245,000
Gross Amounts Carried at Close of Period
Land	939,000
Building and Land Improvements	8,001,000
Total	8,940,000
Accumulated Depreciation	(3,337,000)
940 Elkridge Landing Road [Member]
Initial Cost
Land	842,000
Building and Land Improvements	4,000
Costs Capitalized Subsequent to Acquisition	0
Gross Amounts Carried at Close of Period
Land	842,000
Building and Land Improvements	4,000
Total	846,000
Accumulated Depreciation	0
9651 Hornbaker Road [Member]
Initial Cost
Land	6,050,000
Building and Land Improvements	249,706,000
Costs Capitalized Subsequent to Acquisition	985,000
Gross Amounts Carried at Close of Period
Land	6,050,000
Building and Land Improvements	250,691,000
Total	256,741,000
Accumulated Depreciation	(18,119,000)
Aerotech Commerce [Member]
Initial Cost
Land	900,000
Gross Amounts Carried at Close of Period
Land	900,000
Total	900,000
Arborcrest [Member]
Initial Cost
Land	21,968,000
Building and Land Improvements	122,759,000
Costs Capitalized Subsequent to Acquisition	1,301,000
Gross Amounts Carried at Close of Period
Land	21,968,000
Building and Land Improvements	124,060,000
Total	146,028,000
Accumulated Depreciation	(25,901,000)
Arundel Preserve [Member]
Initial Cost
Land	13,401,000
Building and Land Improvements	9,331,000
Gross Amounts Carried at Close of Period
Land	13,401,000
Building and Land Improvements	9,331,000
Total	22,732,000
Ashburn Crossing - DC 10 [Member]
Initial Cost
Land	4,408,000
Building and Land Improvements	10,689,000
Gross Amounts Carried at Close of Period
Land	4,408,000
Building and Land Improvements	10,689,000
Total	15,097,000
Accumulated Depreciation	(225,000)
Canton Crossing Land [Member]
Initial Cost
Land	16,085,000
Building and Land Improvements	2,134,000
Gross Amounts Carried at Close of Period
Land	16,085,000
Building and Land Improvements	2,134,000
Total	18,219,000
Canton Crossing Util Distr Ctr [Member]
Initial Cost
Land	7,300,000
Building and Land Improvements	15,556,000
Costs Capitalized Subsequent to Acquisition	942,000
Gross Amounts Carried at Close of Period
Land	7,300,000
Building and Land Improvements	16,498,000
Total	23,798,000
Accumulated Depreciation	(3,326,000)
Columbia Gateway - Southridge [Member]
Initial Cost
Land	6,387,000
Building and Land Improvements	3,539,000
Gross Amounts Carried at Close of Period
Land	6,387,000
Building and Land Improvements	3,539,000
Total	9,926,000
Dahlgren Technology Center [Member]
Initial Cost
Land	978,000
Building and Land Improvements	178,000
Gross Amounts Carried at Close of Period
Land	978,000
Building and Land Improvements	178,000
Total	1,156,000
Expedition VII [Member]
Initial Cost
Land	705,000
Building and Land Improvements	728,000
Gross Amounts Carried at Close of Period
Land	705,000
Building and Land Improvements	728,000
Total	1,433,000
InterQuest [Member]
Initial Cost
Land	8,201,000
Building and Land Improvements	0
Gross Amounts Carried at Close of Period
Land	8,201,000
Building and Land Improvements	0
Total	8,201,000
M Square Research Park [Member]
Initial Cost
Building and Land Improvements	2,986,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	2,986,000
Total	2,986,000
National Business Park North [Member]
Initial Cost
Land	28,066,000
Building and Land Improvements	41,936,000
Gross Amounts Carried at Close of Period
Land	28,066,000
Building and Land Improvements	41,936,000
Total	70,002,000
North Gate Business Park [Member]
Initial Cost
Land	6,309,000
Building and Land Improvements	4,540,000
Gross Amounts Carried at Close of Period
Land	6,309,000
Building and Land Improvements	4,540,000
Total	10,849,000
Northwest Crossroads [Member]
Initial Cost
Land	7,430,000
Building and Land Improvements	847,000
Gross Amounts Carried at Close of Period
Land	7,430,000
Building and Land Improvements	847,000
Total	8,277,000
NOVA Office A [Member]
Initial Cost
Land	2,096,000
Building and Land Improvements	47,364,000
Gross Amounts Carried at Close of Period
Land	2,096,000
Building and Land Improvements	47,364,000
Total	49,460,000
Accumulated Depreciation	(1,046,000)
NOVA Office B [Member]
Initial Cost
Land	739,000
Building and Land Improvements	26,277,000
Gross Amounts Carried at Close of Period
Land	739,000
Building and Land Improvements	26,277,000
Total	27,016,000
NOVA Office D [Member]
Initial Cost
Land	6,587,000
Building and Land Improvements	103,000
Gross Amounts Carried at Close of Period
Land	6,587,000
Building and Land Improvements	103,000
Total	6,690,000
Old Annapolis Road [Member]
Initial Cost
Land	1,637,000
Building and Land Improvements	5,500,000
Costs Capitalized Subsequent to Acquisition	3,457,000
Gross Amounts Carried at Close of Period
Land	1,637,000
Building and Land Improvements	8,957,000
Total	10,594,000
Accumulated Depreciation	(2,983,000)
Patriot Park [Member]
Initial Cost
Land	2,328,000
Building and Land Improvements	1,000
Gross Amounts Carried at Close of Period
Land	2,328,000
Building and Land Improvements	1,000
Total	2,329,000
Patriot Point - DC15 [Member]
Initial Cost
Land	12,156,000
Building and Land Improvements	7,112,000
Gross Amounts Carried at Close of Period
Land	12,156,000
Building and Land Improvements	7,112,000
Total	19,268,000
Patriot Point - DC16 [Member]
Initial Cost
Land	12,156,000
Building and Land Improvements	4,110,000
Gross Amounts Carried at Close of Period
Land	12,156,000
Building and Land Improvements	4,110,000
Total	16,266,000
Patriot Point - DC17 [Member]
Initial Cost
Land	6,078,000
Building and Land Improvements	472,000
Gross Amounts Carried at Close of Period
Land	6,078,000
Building and Land Improvements	472,000
Total	6,550,000
Patriot Ridge [Member]
Initial Cost
Land	18,517,000
Building and Land Improvements	14,423,000
Gross Amounts Carried at Close of Period
Land	18,517,000
Building and Land Improvements	14,423,000
Total	32,940,000
Redstone Gateway [Member]
Initial Cost
Building and Land Improvements	14,250,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	14,250,000
Total	14,250,000
Route 15/Biggs Ford Road [Member]
Initial Cost
Land	8,703,000
Building and Land Improvements	596,000
Gross Amounts Carried at Close of Period
Land	8,703,000
Building and Land Improvements	596,000
Total	9,299,000
Sentry Gateway [Member]
Initial Cost
Land	8,275,000
Building and Land Improvements	3,645,000
Gross Amounts Carried at Close of Period
Land	8,275,000
Building and Land Improvements	3,645,000
Total	11,920,000
Sentry Gateway - T [Member]
Initial Cost
Land	14,020,000
Building and Land Improvements	38,804,000
Costs Capitalized Subsequent to Acquisition	13,000
Gross Amounts Carried at Close of Period
Land	14,020,000
Building and Land Improvements	38,817,000
Total	52,837,000
Accumulated Depreciation	(8,618,000)
Sentry Gateway - V [Member]
Initial Cost
Building and Land Improvements	1,066,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	1,066,000
Total	1,066,000
Accumulated Depreciation	(188,000)
Sentry Gateway - W [Member]
Initial Cost
Building and Land Improvements	1,884,000
Gross Amounts Carried at Close of Period
Building and Land Improvements	1,884,000
Total	1,884,000
Accumulated Depreciation	(296,000)
Sentry Gateway - X [Member]
Initial Cost
Land	1,964,000
Building and Land Improvements	21,178,000
Gross Amounts Carried at Close of Period
Land	1,964,000
Building and Land Improvements	21,178,000
Total	23,142,000
Accumulated Depreciation	(2,728,000)
Sentry Gateway - Y [Member]
Initial Cost
Land	1,964,000
Building and Land Improvements	21,298,000
Gross Amounts Carried at Close of Period
Land	1,964,000
Building and Land Improvements	21,298,000
Total	23,262,000
Accumulated Depreciation	(2,745,000)
Sentry Gateway - Z [Member]
Initial Cost
Land	1,964,000
Building and Land Improvements	30,335,000
Gross Amounts Carried at Close of Period
Land	1,964,000
Building and Land Improvements	30,335,000
Total	32,299,000
Accumulated Depreciation	(616,000)
Southpoint Manassas - DC12 [Member]
Initial Cost
Land	4,518,000
Building and Land Improvements	12,701,000
Gross Amounts Carried at Close of Period
Land	4,518,000
Building and Land Improvements	12,701,000
Total	17,219,000
Accumulated Depreciation	(127,000)
Southpoint Manassas - DC14 [Member]
Initial Cost
Land	4,518,000
Building and Land Improvements	13,009,000
Gross Amounts Carried at Close of Period
Land	4,518,000
Building and Land Improvements	13,009,000
Total	17,527,000
Accumulated Depreciation	(101,000)
Westfields - Park Center [Member]
Initial Cost
Land	16,418,000
Building and Land Improvements	7,488,000
Gross Amounts Carried at Close of Period
Land	16,418,000
Building and Land Improvements	7,488,000
Total	23,906,000
Westfields Corporate Center [Member]
Initial Cost
Land	7,141,000
Building and Land Improvements	1,423,000
Gross Amounts Carried at Close of Period
Land	7,141,000
Building and Land Improvements	1,423,000
Total	8,564,000
White Marsh [Member]
Initial Cost
Land	7,852,000
Building and Land Improvements	2,570,000
Gross Amounts Carried at Close of Period
Land	7,852,000
Building and Land Improvements	2,570,000
Total	10,422,000
Woodland Park [Member]
Initial Cost
Land	9,614,000
Building and Land Improvements	85,000
Gross Amounts Carried at Close of Period
Land	9,614,000
Building and Land Improvements	85,000
Total	9,699,000
Other Developments, including intercompany eliminations [Member]
Initial Cost
Land	94,000
Building and Land Improvements	34,000
Costs Capitalized Subsequent to Acquisition	431,000
Gross Amounts Carried at Close of Period
Land	94,000
Building and Land Improvements	465,000
Total	559,000
Accumulated Depreciation	(39,000)
Fair value measurement on a nonrecurring basis [Member] | Real Estate Held [Member]
Additional information
Impairment losses	22,000,000
Fair value measurement on a nonrecurring basis [Member] | Real Estate Investment Properties, Net [Member]
Additional information
Impairment losses	$ 23,500,000	$ 1,400,000

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Schedule III - Real Estate and Accumulated Depreciation (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Changes in cost of properties
Beginning balance	$ 4,014,336	$ 3,811,950	$ 3,859,960
Acquisitions of operating properties	194,616	0	0
Building and land improvements	273,761	254,868	249,639
Sales	(172,628)	(48,466)	(141,045)
Impairments	(29,548)	(3,042)	(45,931)
Other dispositions	(121,921)	(974)	(110,673)
Ending balance	4,158,616	4,014,336	3,811,950
Changes in accumulated depreciation
Beginning balance	703,083	597,649	568,176
Depreciation expense	112,695	111,326	92,677
Sales	(49,614)	(3,129)	(9,542)
Impairments	(6,092)	(1,671)	(14,863)
Other dispositions	(41,392)	(1,092)	(38,799)
Ending balance	$ 718,680	$ 703,083	$ 597,649