10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 10-Q

(Mark one)

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

For the quarterly period ended September 30, 2016

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

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 (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).

Corporate Office Properties Trust ý Yes   o No

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

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.

Corporate Office Properties Trust

Large accelerated filer ý	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 ý	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

As of October 21, 2016, 94,761,691 of Corporate Office Properties Trust’s Common Shares of Beneficial Interest, $0.01 par value, were issued and outstanding.

EXPLANATORY NOTE

This report combines the quarterly reports on Form 10-Q for the period ended September 30, 2016 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 September 30, 2016, 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-Q. 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 quarterly reports on Form 10-Q 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; and

• Note 14, Earnings per Share of COPT and subsidiaries and Earnings per Unit of COPLP and subsidiaries;

• “Item 2: Management’s Discussion and Analysis of Financial Condition and Results of Operations - Liquidity and Capital Resources of COPT”; and

• “Item 2: 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 I, Item 4. 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-Q

		PAGE
PART I: FINANCIAL INFORMATION
Item 1:	Financial Statements:
Consolidated Financial Statements of Corporate Office Properties Trust
	Consolidated Balance Sheets as of September 30, 2016 and December 31, 2015 (unaudited)	3
	Consolidated Statements of Operations for the Three and Nine Months Ended September 30, 2016 and 2015 (unaudited)	4
	Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2016 and 2015 (unaudited)	5
	Consolidated Statements of Equity for the Nine Months Ended September 30, 2016 and 2015 (unaudited)	6
	Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2016 and 2015 (unaudited)	7
Consolidated Financial Statements of Corporate Office Properties, L.P.
	Consolidated Balance Sheets as of September 30, 2016 and December 31, 2015 (unaudited)	9
	Consolidated Statements of Operations for the Three and Nine Months Ended September 30, 2016 and 2015 (unaudited)	10
	Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2016 and 2015 (unaudited)	11
	Consolidated Statements of Equity for the Nine Months Ended September 30, 2016 and 2015 (unaudited)	12
	Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2016 and 2015 (unaudited)	13
Notes to Consolidated Financial Statements (unaudited)		15
Item 2:	Management’s Discussion and Analysis of Financial Condition and Results of Operations	39
Item 3:	Quantitative and Qualitative Disclosures About Market Risk	55
Item 4:	Controls and Procedures	56
PART II: OTHER INFORMATION
Item 1:	Legal Proceedings	57
Item 1A:	Risk Factors	57
Item 2:	Unregistered Sales of Equity Securities and Use of Proceeds	57
Item 3:	Defaults Upon Senior Securities	57
Item 4:	Mine Safety Disclosures	57
Item 5:	Other Information	57
Item 6:	Exhibits	58
SIGNATURES		60

2

PART I: FINANCIAL INFORMATION

ITEM 1. Financial Statements

Corporate Office Properties Trust and Subsidiaries

Consolidated Balance Sheets

(in thousands, except share data)

(unaudited)

	September 30, 2016			December 31, 2015
Assets
Properties, net:
Operating properties, net	$	2,632,069		$	2,920,529
Projects in development or held for future development	396,269			429,219
Total properties, net	3,028,338			3,349,748
Assets held for sale, net	161,454			96,782
Cash and cash equivalents	47,574			60,310
Restricted cash and marketable securities	7,583			7,716
Investment in unconsolidated real estate joint venture	25,721			—
Accounts receivable (net of allowance for doubtful accounts of $612 and $1,525, respectively)	25,790			29,167
Deferred rent receivable (net of allowance of $330 and $1,962, respectively)	87,526			105,484
Intangible assets on real estate acquisitions, net	84,081			98,338
Deferred leasing costs (net of accumulated amortization of $62,767 and $66,364, respectively)	41,470			53,868
Investing receivables	51,119			47,875
Prepaid expenses and other assets, net	73,538			60,024
Total assets	$	3,634,194		$	3,909,312
Liabilities and equity
Liabilities:
Debt, net	$	1,873,836		$	2,077,752
Accounts payable and accrued expenses	112,306			91,755
Rents received in advance and security deposits	28,740			37,148
Dividends and distributions payable	30,225			30,178
Deferred revenue associated with operating leases	9,898			19,758
Interest rate derivatives	17,272			3,160
Other liabilities	38,282			13,779
Total liabilities	2,110,559			2,273,530
Commitments and contingencies (Note 15)
Redeemable noncontrolling interests	22,848			19,218
Equity:
Corporate Office Properties Trust’s shareholders’ equity:
Preferred Shares of beneficial interest at liquidation preference ($0.01 par value; 25,000,000 shares authorized, shares issued and outstanding of 7,431,667 at September 30, 2016 and December 31, 2015)	199,083			199,083
Common Shares of beneficial interest ($0.01 par value; 125,000,000 shares authorized, shares issued and outstanding of 94,764,786 at September 30, 2016 and 94,531,512 at December 31, 2015)	948			945
Additional paid-in capital	2,008,787			2,004,507
Cumulative distributions in excess of net income	(759,262		)	(657,172		)
Accumulated other comprehensive loss	(16,314		)	(2,838		)
Total Corporate Office Properties Trust’s shareholders’ equity	1,433,242			1,544,525
Noncontrolling interests in subsidiaries:
Common units in COPLP	46,757			52,359
Preferred units in COPLP	8,800			8,800
Other consolidated entities	11,988			10,880
Noncontrolling interests in subsidiaries	67,545			72,039
Total equity	1,500,787			1,616,564
Total liabilities, redeemable noncontrolling interest and equity	$	3,634,194		$	3,909,312

See accompanying notes to consolidated financial statements.

3

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Operations

(in thousands, except per share data)

(unaudited)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Revenues
Rental revenue	$	103,956		$	109,080		$	316,862		$	312,826
Tenant recoveries and other real estate operations revenue	26,998			24,606			81,103			71,761
Construction contract and other service revenues	11,149			17,058			34,372			97,554
Total revenues	142,103			150,744			432,337			482,141
Expenses
Property operating expenses	49,952			48,897			149,968			145,996
Depreciation and amortization associated with real estate operations	32,015			38,403			99,790			103,788
Construction contract and other service expenses	10,341			16,132			32,513			94,923
Impairment losses	27,699			2,307			99,837			3,545
General, administrative and leasing expenses	8,855			7,439			28,764			22,864
Business development expenses and land carry costs	1,716			5,573			6,497			10,986
Total operating expenses	130,578			118,751			417,369			382,102
Operating income	11,525			31,993			14,968			100,039
Interest expense	(18,301		)	(24,121		)	(64,499		)	(66,727		)
Interest and other income	1,391			692			3,877			3,217
(Loss) gain on early extinguishment of debt	(59		)	85,745			(37		)	85,677
(Loss) income from continuing operations before equity in income of unconsolidated entities and income taxes	(5,444		)	94,309			(45,691		)	122,206
Equity in income of unconsolidated entities	594			18			614			52
Income tax benefit (expense)	21			(48		)	28			(153		)
(Loss) income from continuing operations	(4,829		)	94,279			(45,049		)	122,105
Discontinued operations	—			—			—			156
(Loss) income before gain on sales of real estate	(4,829		)	94,279			(45,049		)	122,261
Gain on sales of real estate	34,101			15			34,101			4,000
Net income (loss)	29,272			94,294			(10,948		)	126,261
Net (income) loss attributable to noncontrolling interests:
Common units in COPLP	(901		)	(3,357		)	948			(4,231		)
Preferred units in COPLP	(165		)	(165		)	(495		)	(495		)
Other consolidated entities	(907		)	(972		)	(2,799		)	(2,599		)
Net income (loss) attributable to COPT	27,299			89,800			(13,294		)	118,936
Preferred share dividends	(3,552		)	(3,552		)	(10,657		)	(10,657		)
Net income (loss) attributable to COPT common shareholders	$	23,747		$	86,248		$	(23,951	)	$	108,279
Net income (loss) attributable to COPT:
Income (loss) from continuing operations	$	27,299		$	89,800		$	(13,294	)	$	118,783
Discontinued operations, net	—			—			—			153
Net income (loss) attributable to COPT	$	27,299		$	89,800		$	(13,294	)	$	118,936
Basic earnings per common share (1)
Income (loss) from continuing operations	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations	0.00			0.00			0.00			0.00
Net income (loss) attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Diluted earnings per common share (1)
Income (loss) from continuing operations	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations	0.00			0.00			0.00			0.00
Net income (loss) attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Dividends declared per common share	$	0.275		$	0.275		$	0.825		$	0.825

(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.

4

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Comprehensive Income

(in thousands)

(unaudited)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Net income (loss)	$	29,272		$	94,294		$	(10,948	)	$	126,261
Other comprehensive income (loss)
Unrealized gain (loss) on interest rate derivatives	407			(3,638		)	(16,581		)	(6,720		)
Losses on interest rate derivatives included in interest expense	1,043			915			2,763			2,457
Equity in other comprehensive loss of equity method investee	—			—			(184		)	(264		)
Other comprehensive income (loss)	1,450			(2,723		)	(14,002		)	(4,527		)
Comprehensive income (loss)	30,722			91,571			(24,950		)	121,734
Comprehensive income attributable to noncontrolling interests	(2,025		)	(4,453		)	(1,820		)	(7,324		)
Comprehensive income (loss) attributable to COPT	$	28,697		$	87,118		$	(26,770	)	$	114,410

See accompanying notes to consolidated financial statements.

5

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Equity

(Dollars in thousands)

(unaudited)

	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, 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 (151,511 shares issued, net of redemptions)	—		1		5,599			—			—			—			5,600
Redemption of vested equity awards	—		—		(2,330		)	—			—			—			(2,330		)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	—		—		(591		)	—			—			591			—
Comprehensive income	—		—		—			118,936			(4,526		)	5,634			120,044
Dividends	—		—		—			(88,658		)	—			—			(88,658		)
Distributions to owners of common and preferred units in COPLP	—		—		—			—			—			(3,530		)	(3,530		)
Distributions to noncontrolling interests in other consolidated entities	—		—		—			—			—			(47		)	(47		)
Adjustment to arrive at fair value of redeemable noncontrolling interest	—		—		(599		)	—			—			—			(599		)
Balance at September 30, 2015 (94,533,670 common shares outstanding)	$	199,083	$	945	$	2,002,730		$	(686,986	)	$	(5,823	)	$	69,958		$	1,579,907
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
Conversion of common units to common shares (87,000 shares)	—		1		1,166			—			—			(1,167		)	—
Costs associated with common shares issued to the public	—		—		(5		)	—			—			—			(5		)
Share-based compensation (146,274 shares issued, net of redemptions)	—		2		6,175			—			—			—			6,177
Redemption of vested equity awards	—		—		(2,179		)	—			—			—			(2,179		)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	—		—		(42		)	—			—			42			—
Comprehensive loss	—		—		—			(13,294		)	(13,476		)	141			(26,629		)
Dividends	—		—		—			(88,796		)	—			—			(88,796		)
Distributions to owners of common and preferred units in COPLP	—		—		—			—			—			(3,498		)	(3,498		)
Distributions to noncontrolling interests in other consolidated entities	—		—		—			—			—			(12		)	(12		)
Adjustment to arrive at fair value of redeemable noncontrolling interest	—		—		(516		)	—			—			—			(516		)
Tax loss from share-based compensation	—		—		(319		)	—			—			—			(319		)
Balance at September 30, 2016 (94,764,786 common shares outstanding)	$	199,083	$	948	$	2,008,787		$	(759,262	)	$	(16,314	)	$	67,545		$	1,500,787

See accompanying notes to consolidated financial statements.

6

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Cash Flows

(in thousands)

(unaudited)

	For the Nine Months Ended September 30,
	2016			2015
Cash flows from operating activities
Revenues from real estate operations received	$	391,511		$	373,607
Construction contract and other service revenues received	54,399			104,817
Property operating expenses paid	(154,203		)	(146,274		)
Construction contract and other service expenses paid	(33,169		)	(112,614		)
General, administrative, leasing, business development and land carry costs paid	(27,879		)	(29,620		)
Interest expense paid	(61,662		)	(46,278		)
Interest and other income received	472			4,130
Other	504			(26		)
Net cash provided by operating activities	169,973			147,742
Cash flows from investing activities
Construction, development and redevelopment	(121,297		)	(174,434		)
Acquisitions of operating properties and related intangible assets	—			(202,866		)
Tenant improvements on operating properties	(26,055		)	(18,129		)
Other capital improvements on operating properties	(22,063		)	(12,610		)
Proceeds from dispositions of properties	210,661			45,066
Proceeds from partial sale of properties, net of related debt	43,686			—
Investing receivables payments received	—			5,114
Leasing costs paid	(6,024		)	(8,603		)
Other	(991		)	(4,827		)
Net cash provided by (used in) investing activities	77,917			(371,289		)
Cash flows from financing activities
Proceeds from debt
Revolving Credit Facility	362,500			422,000
Unsecured senior notes	—			296,580
Other debt proceeds	105,000			50,000
Repayments of debt
Revolving Credit Facility	(406,000		)	(418,000		)
Scheduled principal amortization	(4,454		)	(5,011		)
Other debt repayments	(203,056		)	(50,681		)
Deferred financing costs paid	(825		)	(5,377		)
Net proceeds from issuance of common shares	(46		)	28,567
Common share dividends paid	(78,072		)	(77,641		)
Preferred share dividends paid	(10,657		)	(10,657		)
Distributions paid to noncontrolling interests in COPLP	(3,476		)	(3,581		)
Distributions paid to redeemable noncontrolling interests	(14,329		)	—
Redemption of vested equity awards	(2,179		)	(2,330		)
Other	(5,032		)	(2,559		)
Net cash (used in) provided by financing activities	(260,626		)	221,310
Net decrease in cash and cash equivalents	(12,736		)	(2,237		)
Cash and cash equivalents
Beginning of period	60,310			6,077
End of period	$	47,574		$	3,840

See accompanying notes to consolidated financial statements.

7

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Cash Flows (continued)

(in thousands)

(unaudited)

	For the Nine Months Ended September 30,
	2016			2015
Reconciliation of net (loss) income to net cash provided by operating activities:
Net (loss) income	$	(10,948	)	$	126,261
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and other amortization	101,429			105,397
Impairment losses	99,797			3,779
Losses on interest rate derivatives	347			—
Amortization of deferred financing costs and net debt discounts	4,456			4,144
Increase in deferred rent receivable	(930		)	(11,939		)
Gain on sales of real estate	(34,101		)	(4,000		)
Share-based compensation	5,637			4,949
Loss (gain) on early extinguishment of debt	34			(86,075		)
Other	(2,761		)	1,922
Operating changes in assets and liabilities:
Decrease in accounts receivable	3,658			6,526
Decrease (increase) in restricted cash and marketable securities	18			(1,102		)
Increase in prepaid expenses and other assets, net	(19,778		)	(5,228		)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	31,523			(655		)
(Decrease) increase in rents received in advance and security deposits	(8,408		)	3,763
Net cash provided by operating activities	$	169,973		$	147,742
Supplemental schedule of non-cash investing and financing activities:
Increase (decrease) in accrued capital improvements, leasing and other investing activity costs	$	9,963		$	(11,722	)
Increase in property and redeemable noncontrolling interests in connection with property contributed in a joint venture	$	22,600		$	—
Decrease in redeemable noncontrolling interests and increase in other liabilities in connection with distribution payable to redeemable noncontrolling interest	$	6,683		$	—
Non-cash changes from partial sale of properties, net of debt:
Decrease in properties, net	$	(114,597	)	$	—
Increase in investment in unconsolidated real estate joint venture	$	25,680		$	—
Decrease in debt	$	59,534		$	—
Other net decreases in assets and liabilities	$	3,619		$	—
Debt assumed on acquisition of operating property	$	—		$	55,490
Other liabilities assumed on acquisition of operating properties	$	—		$	5,265
Decrease in property in connection with surrender of property in settlement of debt	$	—		$	(82,738	)
Decrease in debt in connection with surrender of property in settlement of debt	$	—		$	(150,000	)
Decrease in fair value of derivatives applied to accumulated other comprehensive loss and noncontrolling interests	$	(13,817	)	$	(4,263	)
Equity in other comprehensive loss of an equity method investee	$	(184	)	$	(264	)
Dividends/distribution payable	$	30,225		$	30,182
Decrease in noncontrolling interests and increase in shareholders’ equity in connection with the conversion of common units into common shares	$	1,167		$	2,151
Adjustments to noncontrolling interests resulting from changes in COPLP ownership	$	42		$	591
Increase in redeemable noncontrolling interest and decrease in equity to carry redeemable noncontrolling interest at fair value	$	516		$	599

See accompanying notes to consolidated financial statements.

8

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Balance Sheets

(in thousands, except unit data)

(unaudited)

	September 30, 2016			December 31, 2015
Assets
Properties, net:
Operating properties, net	$	2,632,069		$	2,920,529
Projects in development or held for future development	396,269			429,219
Total properties, net	3,028,338			3,349,748
Assets held for sale, net	161,454			96,782
Cash and cash equivalents	47,574			60,310
Restricted cash and marketable securities	2,333			1,953
Investment in unconsolidated real estate joint venture	25,721			—
Accounts receivable (net of allowance for doubtful accounts of $612 and $1,525, respectively)	25,790			29,167
Deferred rent receivable (net of allowance of $330 and $1,962, respectively)	87,526			105,484
Intangible assets on real estate acquisitions, net	84,081			98,338
Deferred leasing costs (net of accumulated amortization of $62,767 and $66,364, respectively)	41,470			53,868
Investing receivables	51,119			47,875
Prepaid expenses and other assets, net	73,538			60,024
Total assets	$	3,628,944		$	3,903,549
Liabilities and equity
Liabilities:
Debt, net	$	1,873,836		$	2,077,752
Accounts payable and accrued expenses	112,306			91,755
Rents received in advance and security deposits	28,740			37,148
Distributions payable	30,225			30,178
Deferred revenue associated with operating leases	9,898			19,758
Interest rate derivatives	17,272			3,160
Other liabilities	33,032			8,016
Total liabilities	2,105,309			2,267,767
Commitments and contingencies (Note 15)
Redeemable noncontrolling interests	22,848			19,218
Equity:
Corporate Office Properties, L.P.’s equity:
Preferred units
General partner, preferred units outstanding of 7,431,667 at September 30, 2016 and December 31, 2015	199,083			199,083
Limited partner, 352,000 preferred units outstanding at September 30, 2016 and December 31, 2015	8,800			8,800
Common units, 94,764,786 and 94,531,512 held by the general partner and 3,590,391 and 3,677,391 held by limited partners at September 30, 2016 and December 31, 2015, respectively	1,297,858			1,400,745
Accumulated other comprehensive loss	(16,987		)	(2,985		)
Total Corporate Office Properties, L.P.’s equity	1,488,754			1,605,643
Noncontrolling interests in subsidiaries	12,033			10,921
Total equity	1,500,787			1,616,564
Total liabilities, redeemable noncontrolling interest and equity	$	3,628,944		$	3,903,549

See accompanying notes to consolidated financial statements.

9

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Operations

(in thousands, except per unit data)

(unaudited)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Revenues
Rental revenue	$	103,956		$	109,080		$	316,862		$	312,826
Tenant recoveries and other real estate operations revenue	26,998			24,606			81,103			71,761
Construction contract and other service revenues	11,149			17,058			34,372			97,554
Total revenues	142,103			150,744			432,337			482,141
Expenses
Property operating expenses	49,952			48,897			149,968			145,996
Depreciation and amortization associated with real estate operations	32,015			38,403			99,790			103,788
Construction contract and other service expenses	10,341			16,132			32,513			94,923
Impairment losses	27,699			2,307			99,837			3,545
General, administrative and leasing expenses	8,855			7,439			28,764			22,864
Business development expenses and land carry costs	1,716			5,573			6,497			10,986
Total operating expenses	130,578			118,751			417,369			382,102
Operating income	11,525			31,993			14,968			100,039
Interest expense	(18,301		)	(24,121		)	(64,499		)	(66,727		)
Interest and other income	1,391			692			3,877			3,217
(Loss) gain on early extinguishment of debt	(59		)	85,745			(37		)	85,677
(Loss) income from continuing operations before equity in income of unconsolidated entities and income taxes	(5,444		)	94,309			(45,691		)	122,206
Equity in income of unconsolidated entities	594			18			614			52
Income tax benefit (expense)	21			(48		)	28			(153		)
(Loss) income from continuing operations	(4,829		)	94,279			(45,049		)	122,105
Discontinued operations	—			—			—			156
(Loss) income before gain on sales of real estate	(4,829		)	94,279			(45,049		)	122,261
Gain on sales of real estate	34,101			15			34,101			4,000
Net income	29,272			94,294			(10,948		)	126,261
Net income attributable to noncontrolling interests in consolidated entities	(913		)	(972		)	(2,803		)	(2,602		)
Net income (loss) attributable to COPLP	28,359			93,322			(13,751		)	123,659
Preferred unit distributions	(3,717		)	(3,717		)	(11,152		)	(11,152		)
Net income (loss) attributable to COPLP common unitholders	$	24,642		$	89,605		$	(24,903	)	$	112,507
Net income (loss) attributable to COPLP:
Income (loss) from continuing operations	$	28,359		$	93,322		$	(13,751	)	$	123,500
Discontinued operations, net	—			—			—			159
Net income (loss) attributable to COPLP	$	28,359		$	93,322		$	(13,751	)	$	123,659
Basic earnings per common unit (1)
Income (loss) from continuing operations	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations	0.00			0.00			0.00			0.00
Net income (loss) attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Diluted earnings per common unit (1)
Income (loss) from continuing operations	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations	0.00			0.00			0.00			0.00
Net income (loss) attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Distributions declared per common unit	$	0.275		$	0.275		$	0.825		$	0.825

(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.

10

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Comprehensive Income

(in thousands)

(unaudited)

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Net income (loss)	$	29,272		$	94,294		$	(10,948	)	$	126,261
Other comprehensive income (loss)
Unrealized gain (loss) on interest rate derivatives	407			(3,638		)	(16,581		)	(6,720		)
Losses on interest rate derivatives included in interest expense	1,043			915			2,763			2,457
Equity in other comprehensive loss of equity method investee	—			—			(184		)	(264		)
Other comprehensive income (loss)	1,450			(2,723		)	(14,002		)	(4,527		)
Comprehensive income (loss)	30,722			91,571			(24,950		)	121,734
Comprehensive income attributable to noncontrolling interests	(913		)	(1,035		)	(2,803		)	(2,780		)
Comprehensive income (loss) attributable to COPLP	$	29,809		$	90,536		$	(27,753	)	$	118,954

See accompanying notes to consolidated financial statements.

11

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Equity

(Dollars in thousands)

(unaudited)

	Limited Partner Preferred Units				General Partner  Preferred Units				Common Units				Accumulated Other Comprehensive Income (Loss)			Noncontrolling Interests in Subsidiaries
	Units	Amount			Units	Amount			Units	Amount									Total Equity
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 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)	—	—			—	—			151,511	5,600			—			—			5,600
Redemptions of vested equity awards	—	—			—	—			—	(2,330		)	—			—			(2,330		)
Comprehensive income	—	495			—	10,657			—	112,507			(4,705		)	1,090			120,044
Distributions to owners of common and preferred units	—	(495		)	—	(10,657		)	—	(81,036		)	—			—			(92,188		)
Distributions to noncontrolling interests in subsidiaries	—	—			—	—			—	—			—			(47		)	(47		)
Adjustment to arrive at fair value of redeemable noncontrolling interest	—	—			—	—			—	(599		)	—			—			(599		)
Balance at September 30, 2015	352,000	$	8,800		7,431,667	$	199,083		98,211,061	$	1,367,904		$	(6,086	)	$	10,206		$	1,579,907
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
Costs associated with common shares issued to the public	—	—			—	—			—	(5		)	—			—			(5		)
Share-based compensation (units net of redemption)	—	—			—	—			146,274	6,177			—			—			6,177
Redemptions of vested equity awards	—	—			—	—			—	(2,179		)	—			—			(2,179		)
Comprehensive loss	—	495			—	10,657			—	(24,903		)	(14,002		)	1,124			(26,629		)
Distributions to owners of common and preferred units	—	(495		)	—	(10,657		)	—	(81,142		)	—			—			(92,294		)
Distributions to noncontrolling interests in subsidiaries	—	—			—	—			—	—			—			(12		)	(12		)
Adjustment to arrive at fair value of redeemable noncontrolling interest	—	—			—	—			—	(516		)	—			—			(516		)
Tax loss from share-based compensation	—	—			—	—			—	(319		)	—			—			(319		)
Balance at September 30, 2016	352,000	$	8,800		7,431,667	$	199,083		98,355,177	$	1,297,858		$	(16,987	)	$	12,033		$	1,500,787

See accompanying notes to consolidated financial statements.

12

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Cash Flows

(in thousands)

(unaudited)

	For the Nine Months Ended September 30,
	2016			2015
Cash flows from operating activities
Revenues from real estate operations received	$	391,511		$	373,607
Construction contract and other service revenues received	54,399			104,817
Property operating expenses paid	(154,203		)	(146,274		)
Construction contract and other service expenses paid	(33,169		)	(112,614		)
General, administrative, leasing, business development and land carry costs paid	(27,879		)	(29,620		)
Interest expense paid	(61,662		)	(46,278		)
Interest and other income received	472			4,130
Other	504			(26		)
Net cash provided by operating activities	169,973			147,742
Cash flows from investing activities
Construction, development and redevelopment	(121,297		)	(174,434		)
Acquisitions of operating properties and related intangible assets	—			(202,866		)
Tenant improvements on operating properties	(26,055		)	(18,129		)
Other capital improvements on operating properties	(22,063		)	(12,610		)
Proceeds from dispositions of properties	210,661			45,066
Proceeds from partial sale of properties, net of related debt	43,686			—
Investing receivables payments received	—			5,114
Leasing costs paid	(6,024		)	(8,603		)
Other	(991		)	(4,827		)
Net cash provided by (used in) investing activities	77,917			(371,289		)
Cash flows from financing activities
Proceeds from debt
Revolving Credit Facility	362,500			422,000
Unsecured senior notes	—			296,580
Other debt proceeds	105,000			50,000
Repayments of debt
Revolving Credit Facility	(406,000		)	(418,000		)
Scheduled principal amortization	(4,454		)	(5,011		)
Other debt repayments	(203,056		)	(50,681		)
Deferred financing costs paid	(825		)	(5,377		)
Net proceeds from issuance of common units	(46		)	28,567
Common unit distributions paid	(81,053		)	(80,727		)
Preferred unit distributions paid	(11,152		)	(11,152		)
Redemption of vested equity awards	(2,179		)	(2,330		)
Distributions paid to redeemable noncontrolling interests	(14,329		)	—
Other	(5,032		)	(2,559		)
Net cash (used in) provided by financing activities	(260,626		)	221,310
Net decrease in cash and cash equivalents	(12,736		)	(2,237		)
Cash and cash equivalents
Beginning of period	60,310			6,077
End of period	$	47,574		$	3,840

See accompanying notes to consolidated financial statements.

13

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Statements of Cash Flows (Continued)

(in thousands)

(unaudited)

	For the Nine Months Ended September 30,
	2016			2015
Reconciliation of net (loss) income to net cash provided by operating activities:
Net (loss) income	$	(10,948	)	$	126,261
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and other amortization	101,429			105,397
Impairment losses	99,797			3,779
Losses on interest rate derivatives	347			—
Amortization of deferred financing costs and net debt discounts	4,456			4,144
Increase in deferred rent receivable	(930		)	(11,939		)
Gain on sales of real estate	(34,101		)	(4,000		)
Share-based compensation	5,637			4,949
Loss (gain) on early extinguishment of debt	34			(86,075		)
Other	(2,761		)	1,922
Operating changes in assets and liabilities:
Decrease in accounts receivable	3,658			6,526
Increase in restricted cash and marketable securities	(495		)	(1,485		)
Increase in prepaid expenses and other assets, net	(19,778		)	(5,228		)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	32,036			(272		)
(Decrease) increase in rents received in advance and security deposits	(8,408		)	3,763
Net cash provided by operating activities	$	169,973		$	147,742
Supplemental schedule of non-cash investing and financing activities:
Increase (decrease) in accrued capital improvements, leasing and other investing activity costs	$	9,963		$	(11,722	)
Increase in property and redeemable noncontrolling interests in connection with property contributed in a joint venture	$	22,600		$	—
Decrease in redeemable noncontrolling interests and increase in other liabilities in connection with distribution payable to redeemable noncontrolling interest	$	6,683		$	—
Non-cash changes from partial sale of properties, net of debt:
Decrease in properties, net	$	(114,597	)	$	—
Increase in investment in unconsolidated real estate joint venture	$	25,680		$	—
Decrease in debt	$	59,534		$	—
Other net decreases in assets and liabilities	$	3,619		$	—
Debt assumed on acquisition of operating property	$	—		$	55,490
Other liabilities assumed on acquisition of operating properties	$	—		$	5,265
Decrease in property in connection with surrender of property in settlement of debt	$	—		$	(82,738	)
Decrease in debt in connection with surrender of property in settlement of debt	$	—		$	(150,000	)
Decrease in fair value of derivatives applied to accumulated other comprehensive loss and noncontrolling interests	$	(13,817	)	$	(4,263	)
Equity in other comprehensive loss of an equity method investee	$	(184	)	$	(264	)
Distributions payable	$	30,225		$	30,182
Increase in redeemable noncontrolling interest and decrease in equity to carry redeemable noncontrolling interest at fair value	$	516		$	599

See accompanying notes to consolidated financial statements.

14

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

Notes to Consolidated Financial Statements

(unaudited)

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 September 30, 2016, our properties included the following:

• 168 operating office properties totaling 17.5 million square feet, including 12 triple-net leased, single-tenant data center properties. We owned six of these properties through an unconsolidated real estate joint venture;

• 10 office properties under, or contractually committed for, construction or redevelopment that we estimate will total approximately 1.2 million square feet upon completion, including two partially operational properties

included above and two properties completed but held for future lease to the United States Government;

• 1,358 acres of land we control that we believe could be developed into approximately 16.2 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 September 30, 2016, 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

15

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.

These interim financial statements should be read together with the consolidated financial statements and notes thereto as of and for the year ended December 31, 2015 included in our 2015 Annual Report on Form 10-K.  The unaudited consolidated financial statements include all adjustments that are necessary, in the opinion of management, to fairly state our financial position and results of operations.  All adjustments are of a normal recurring nature.  The consolidated financial statements have been prepared using the accounting policies described in our 2015 Annual Report on Form 10-K.

Recent Accounting Pronouncements

We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) effective January 1, 2016 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. Our adoption of this guidance did not affect on our reported consolidated financial statements.

We adopted guidance issued by the FASB effective January 1, 2016 modifying the analysis that must be performed by us in determining whether we should consolidate certain types of legal entities. The guidance did not amend the existing disclosure requirements for VIEs or voting interest model entities.  The guidance, however, modified the requirements to qualify under the voting interest model. Under the revised guidance, COPLP is considered a variable interest entity of COPT. As COPLP was already consolidated in the balance sheets of COPT, the identification of COPLP as a variable interest entity had no impact on the consolidated financial statements.  There were no other legal entities qualifying under the scope of the revised guidance that were consolidated as a result of the adoption.  In addition, there were no voting interest entities under prior existing guidance determined to be variable interest entities under the revised guidance.  

We adopted effective January 1, 2016 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. Our adoption of this guidance did not affect our reported consolidated financial statements.

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 February 2016, the FASB issued guidance that sets forth principles for the recognition, measurement, presentation and disclosure of leases.  This guidance requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. The resulting classification determines whether the lease expense is recognized based on an effective interest method or straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases. The guidance requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases.  This guidance is effective for reporting periods beginning after December 15, 2018, with early adoption permitted. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In March 2016, the FASB issued guidance intended to simplify certain aspects of the accounting for employee based share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the consolidated statement of cash flows. This guidance is effective for annual periods beginning after

16

December 15, 2016, and interim periods within those annual periods, with early adoption permitted. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In June 2016, the FASB issued guidance that changes how entities measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current incurred loss model with an expected loss approach, resulting in a more timely recognition of such losses. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In August 2016, the FASB issued guidance that clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows with the objective of reducing the existing diversity in practice related to eight specific cash flow issues. The guidance is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

3.Fair Value Measurements

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 $5.3 million as of September 30, 2016, 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 September 30, 2016, 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.

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 6, 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 8, we estimated the fair value of our unsecured 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 as of 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 6 for investing receivables, Note 8 for debt and Note 9 for interest rate derivatives. 

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COPT and Subsidiaries

The table below sets forth financial assets and liabilities of COPT and its subsidiaries that are accounted for at fair value on a recurring basis as of September 30, 2016 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
Assets:
Marketable securities in deferred compensation plan (1)
Mutual funds	$	5,160	$	—	$	—	$	5,160
Other	90		—		—		90
Total assets	$	5,250	$	—	$	—	$	5,250
Liabilities:
Deferred compensation plan liability (2)	$	—	$	5,250	$	—	$	5,250
Interest rate derivatives	—		17,272		—		17,272
Total liabilities	$	—	$	22,522	$	—	$	22,522

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

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

COPLP and Subsidiaries

The table below sets forth financial assets and liabilities of COPLP and its subsidiaries that are accounted for at fair value on a recurring basis as of September 30, 2016 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
Liabilities:
Interest rate derivatives	$	—	$	17,272	$	—	$	17,272

Nonrecurring Fair Value Measurements

In the first quarter of 2016, we set a goal to raise cash from sales of properties in 2016 considerably in excess of the $96.8 million in assets held for sale at December 31, 2015. The specific properties we would sell to achieve this goal had not been identified when the goal was established. Throughout 2016, we have been in the process of identifying properties we will sell.

In the first quarter of 2016, we reclassified: most of our properties in Greater Philadelphia (included in our Regional Office segment); two properties in the Fort Meade/BW Corridor sub-segment; and our remaining land holdings in Colorado Springs, Colorado to held for sale and recognized $2.4 million of impairment losses. As of March 31, 2016, we had $225.9 million of assets held for sale.

During the second quarter of 2016, as part of our closing process, we conducted our quarterly review of our portfolio for indicators of impairment considering the refined investment strategy of our then newly-appointed Chief Executive Officer and the goals of the asset sales program and concluded that we would: (1) not hold our operating properties in Aberdeen, Maryland (“Aberdeen”) for the long-term; (2) not develop commercial properties on land in Frederick, Maryland; (3) sell specific properties in our Northern Virginia Defense/IT and Fort Meade/BW Corridor sub-segments; and (4) sell the remaining operating property in Greater Philadelphia that had not previously been classified as held for sale. Accordingly, we performed recoverability analyses for each of these properties and recorded the following impairment losses:

• $34.4 million on operating properties in Aberdeen (included in our Other segment). After shortening our estimated holding period for these properties, we determined that the carrying amount of the properties would not likely be recovered from the operation and eventual dispositions of the properties during the shortened holding period. Accordingly, we adjusted the properties to their estimated fair values;

• $4.4 million on land in Aberdeen. In performing our analysis related to the operating properties in Aberdeen, we determined that the weakening leasing and overall commercial real estate conditions in that market indicated that our

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land holdings in the market may be impaired. As a result, we determined that the carrying amount of the land was not recoverable and adjusted the land to its estimated fair value;

• $8.2 million on land in Frederick, Maryland. We determined that the carrying amount of the land would not likely be recovered from its sale and adjusted the land to its estimated fair value;

• $14.1 million on operating properties in our Northern Virginia and Fort Meade/BW Corridor sub-segments that we reclassified to held for sale during the period whose carrying amounts exceeded their estimated fair values less costs to sell; and

• $6.2 million on the property in Greater Philadelphia (included in our Regional Office segment) that we reclassified to held for sale during the period and adjusted to fair value less costs to sell.

There were no property sales in the second quarter of 2016 and as of June 30, 2016, we had $300.6 million of assets held for sale.

During the third quarter of 2016, as part of our closing process, we conducted our quarterly review of our portfolio for indicators of impairment considering refinements to our disposition strategy made during the third quarter of 2016 to sell an additional operating property in our Northern Virginia Defense/IT sub-segment, an additional operating property in our Fort Meade/BW Corridor sub-segment and our remaining operating properties and land in White Marsh, Maryland (“White Marsh”) that had not previously been classified as held for sale. In connection with our determinations that we planned to sell these properties, we performed recoverability analyses for each of these properties and recorded the following impairment losses:

• $13.3 million on the operating property in our Northern Virginia Defense/IT sub-segment. Communication with a major tenant in the building during the quarter led us to conclude that there was significant uncertainty with respect to the tenant renewing its lease expiring in 2019. As a result of this information and continuing sub-market weakness, we determined that this property no longer met our long-term hold strategy and we placed it into our asset sales program. Accordingly, we adjusted the carrying amount of the property to its estimated fair value less costs to sell; and

• $2.9 million on the other properties that we reclassified as held for sale, primarily associated with a land parcel in White Marsh. As of June 30, 2016, this land was under a sales contract subject to a re-zoning contingency. During the third quarter, we were denied favorable re-zoning and the contract was canceled. As a result, we determined this property will be sold as is, reclassified it to held for sale and adjusted its carrying value to its estimated fair value less costs to sell.

During our review we also recognized additional impairment losses of $11.5 million on properties previously classified as held for sale. Approximately $10 million of these losses pertained to properties in White Marsh due to our assessment that certain significant tenants will likely exercise lease termination rights and to reflect market conditions. The remainder of these losses pertained primarily to properties in San Antonio, Texas (in our Other segment), where prospective purchasers reduced offering prices late in the third quarter. We executed property sales of $210.7 million in the third quarter of 2016 (discussed further in Note 4), and had $161.5 million of assets held for sale at September 30, 2016.

Changes in the expected future cash flows due to changes in our plans for specific properties (especially our expected holding period) could result in the recognition of additional impairment losses. In addition, because properties held for sale are carried at the lower of carrying value or estimated fair values less costs to sell, declines in their estimated fair values due to market conditions and other factors could result in the recognition of additional impairment losses.

The table below sets forth the fair value hierarchy of the valuation technique we used to determine nonrecurring fair value measurements of these assets as of September 30, 2016 (dollars in thousands):

	Fair Values as of September 30, 2016
	Quoted Prices in				Significant
	Active Markets for		Significant Other		Unobservable
	Identical Assets		Observable Inputs		Inputs
Description	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Assets held for sale, net	$	—	$	—	$	127,128	$	127,128

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The table below sets forth quantitative information about significant unobservable inputs used for the Level 3 fair value measurements reported above as of September 30, 2016 (dollars in thousands):

Valuation Technique	Fair Values on  Measurement Date		Unobservable Input	Range (Weighted Average)
Contracts to sell	$	87,983	Contract amounts	N/A
Discounted cash flow	$	36,693	Discount rate	9.5% - 11.3% (10.5%)
			Terminal capitalization rate	8.3% - 9.5% (8.7%)
Yield analyses	$	2,452	Investor yield requirement	9.0% (1)

(1) Only one fair value applied for this unobservable input.

4.Properties, Net

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

	September 30, 2016			December 31, 2015
Land	$	424,627		$	463,305
Buildings and improvements	2,888,918			3,157,587
Less: Accumulated depreciation	(681,476		)	(700,363		)
Operating properties, net	$	2,632,069		$	2,920,529

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

	September 30, 2016		December 31, 2015
Land	$	199,038	$	207,774
Development in progress, excluding land	197,231		221,445
Projects in development or held for future development	$	396,269	$	429,219

Our properties held for sale included:

• as of September 30, 2016: nine operating properties in White Marsh (included primarily in our Regional Office segment); two operating properties in our Northern Virginia Defense/IT sub-segment; six operating properties in our Fort Meade/BW Corridor sub-segment; two operating properties in San Antonio, Texas (included in our Other segment); and land in White Marsh, Northern Virginia and Colorado Springs; and

• as of December 31, 2015: 13 operating properties in White Marsh (included in our Regional Office segment); two operating properties in San Antonio, Texas (included in our Other segment); and land in Northern Virginia and Colorado Springs.

The table below sets forth the components of assets held for sale on our consolidated balance sheet for these properties (in thousands):

	September 30, 2016		December 31, 2015
Properties, net	$	147,236	$	90,188
Deferred rent receivable	6,642		2,891
Intangible assets on real estate acquisitions, net	1,540		1,591
Deferred leasing costs, net	4,901		1,391
Lease incentives, net	1,135		721
Assets held for sale, net	$	161,454	$	96,782

Acquisitions

We acquired the following operating properties in 2015:

• 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;

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• 2600 Park Tower Drive, a 237,000 square foot office property in Vienna, Virginia (in the Northern Virginia region) 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.

These properties contributed:

• revenues of $9.2 million for the three months ended September 30, 2016, $6.9 million for the three months ended September 30, 2015, $27.6 million for the nine months ended September 30, 2016 and $11.2 million for the nine months ended September 30, 2015; and

• net income from continuing operations of $432,000 for the three months ended September 30, 2016, $487,000 for the three months ended September 30, 2015, $2.4 million for the nine months ended September 30, 2016 and $697,000 for the nine months ended September 30, 2015.

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 September 30, 2016. 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 operating property acquisition costs to the nine months ended September 30, 2014 from the 2015 periods in which they were actually incurred. 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 share amounts).

	For the Three Months Ended September 30, 2015		For the Nine Months Ended September 30, 2015
	(Unaudited)
Pro forma total revenues	$	152,736	$	498,657
Pro forma net income attributable to COPT common shareholders	$	88,836	$	112,941
Pro forma EPS:
Basic	$	0.94	$	1.20
Diluted	$	0.94	$	1.20

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2016 Dispositions

During the nine months ended September 30, 2016, 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		Gain on Disposition
Arborcrest Corporate Campus (1)	Philadelphia, PA	Regional Office	8/4/2016	4	654,000	$	142,800	$	4,742
8003 Corporate Drive	White Marsh, MD	Regional Office	8/17/2016	1	18,000	2,400		—
1341 & 1343 Ashton Road	Hanover, MD	Fort Meade/BW Corridor	9/9/2016	2	25,000	2,900		848
8007, 8013, 8015, 8019 and 8023-8027 Corporate Drive (1)	White Marsh, MD	Regional Office	9/21/2016	5	130,000	14,513		1,906
1302, 1304 and 1306 Concourse Drive	Linthicum, MD	Fort Meade/BW Corridor	9/29/2016	3	299,000	48,100		8,683
				15	1,126,000	$	210,713	$	16,179

(1) This disposition also included land.

We also sold:

• a 50% interest in six triple-net leased, single-tenant data center properties in Virginia by contributing them into a newly-formed joint venture, GI-COPT DC Partnership LLC (“GI-COPT”), for an aggregate property value of $147.6 million on July 21, 2016. We obtained $60.0 million in non-recourse mortgage loans on the properties through the joint venture immediately prior to the sale of our interest and received the net proceeds. Our partner in the joint venture acquired the 50% interest in the joint venture from us for $44.3 million. We account for our 50% interest in the joint venture using the equity method of accounting as described further in Note 5. We recognized a partial gain on the sale of our interest of $17.9 million; and

• other land for $5.7 million, with no gain recognized.

2016 Construction Activities

During the nine months endedSeptember 30, 2016, we placed into service 490,000 square feet in five newly constructed office properties (including a partially operational property) and 55,000 square feet in two redeveloped properties (including a partially operational property). As of September 30, 2016, we had seven office properties under construction, or for which we were contractually committed to construct, that we estimate will total 1.1 million square feet upon completion (including two properties completed but held for future lease to the United States Government) and three office properties under redevelopment that we estimate will total 104,000 square feet upon completion.

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5.Real Estate Joint Ventures

Consolidated Joint Ventures

The table below sets forth information pertaining to our investments in consolidated real estate joint ventures as of September 30, 2016 (dollars in thousands):

		Nominal
		Ownership		September 30, 2016				(1)
	Date	% as of		Total		Encumbered		Total
	Acquired	9/30/2016	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	157,168	$	80,154	$	53,056
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	66,053		47,006		45,807
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	40,282		—		7,680
				$	263,503	$	127,160	$	106,543

(1) Excludes amounts eliminated in consolidation.

(2) This joint venture’s properties are in Huntsville, Alabama.

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

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

In January 2016, our partner in Stevens Investors, LLC contributed to the joint venture, for a value of $22.6 million, interests in contracts controlling land to be developed (including a purchase agreement and a ground lease). Our partner subsequently received a cash distribution from the joint venture of $13.4 million, which was funded by us. Our partner is also entitled to receive an additional distribution from the joint venture of $6.7 million to be funded by us (expected in 2017) that was reported in other liabilities on our consolidated balance sheet as of September 30, 2016.

Unconsolidated Joint Venture

As described further in Note 4, on July 21, 2016, we sold a 50% interest in six triple-net leased, single-tenant data center properties in Virginia by contributing them into GI-COPT, a newly-formed joint venture. We account for our 50% interest in the joint venture using the equity method of accounting. As of September 30, 2016, we had an investment balance in GI-COPT of $25.7 million. Our balance is $18.5 million lower than our share of the joint venture’s equity due to a difference between our cost basis and our share of the underlying equity in the net assets upon formation of the joint venture; we are amortizing this basis difference into equity in income from unconsolidated entities over the lives of the underlying assets. Under the terms of the joint venture agreement, we and our partner receive returns in proportion to our investments in the joint venture.

6.     Investing Receivables

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

	September 30, 2016		December 31, 2015
Notes receivable from the City of Huntsville	$	48,098	$	44,875
Other investing loans receivable	3,021		3,000
	$	51,119	$	47,875

Our notes receivable from the City of Huntsville funded infrastructure costs in connection with our LW Redstone Company, LLC joint venture (see Note 5) and carry an interest rate of 9.95%.

We did not have an allowance for credit losses in connection with our investing receivables as of September 30, 2016 or December 31, 2015.  The fair value of these receivables approximated their carrying amounts as of September 30, 2016 and December 31, 2015.

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7.    Prepaid Expenses and Other Assets, Net

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

	September 30, 2016		December 31, 2015
Prepaid expenses	$	28,752	$	23,009
Lease incentives, net	19,106		11,133
Construction contract costs incurred in excess of billings	6,367		3,261
Furniture, fixtures and equipment, net	5,492		6,004
Deferred financing costs, net (1)	3,812		5,867
Deferred tax asset, net (2)	3,282		3,467
Other assets	6,727		7,283
Prepaid expenses and other assets, net	$	73,538	$	60,024

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

(2) Includes a valuation allowance of $2.1 million.

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8.    Debt, Net

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

	Carrying Value (1) as of					Scheduled Maturity
	September 30, 2016		December 31, 2015		Stated Interest Rates as of	as of
					September 30, 2016	September 30, 2016
Mortgage and Other Secured Loans:
Fixed rate mortgage loans (2)	$	154,976	$	281,208	3.82% - 7.87% (3)	2019-2026
Variable rate secured loans	13,529		49,792		LIBOR + 1.85% (4)	October 2020
Total mortgage and other secured loans	168,505		331,000
Revolving Credit Facility	—		43,500		LIBOR + 0.875% to 1.60%	May 2019
Term Loan Facilities (5)	516,812		515,902		LIBOR + 0.90% to 2.60% (6)	2019-2022
Unsecured Senior Notes
3.600%, $350,000 aggregate principal	347,024		346,714		3.60% (7)	May 2023
5.250%, $250,000 aggregate principal	246,063		245,731		5.25% (8)	February 2024
3.700%, $300,000 aggregate principal	297,725		297,378		3.70% (9)	June 2021
5.000%, $300,000 aggregate principal	296,279		296,019		5.00% (10)	July 2025
Unsecured notes payable	1,428		1,508		0% (11)	2026
Total debt, net	$	1,873,836	$	2,077,752

(1) The carrying values of our loans other than the Revolving Credit Facility reflect net deferred financing costs of $6.9 million as of September 30, 2016 and $8.0 million as of December 31, 2015.

(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 $440,000 as of September 30, 2016 and $514,000 as of December 31, 2015.

(3) The weighted average interest rate on our fixed rate mortgage loans was 4.20% as of September 30, 2016.

(4)  The interest rate on our variable rate secured loan as of September 30, 2016 was 2.37%.

(5)   As of September 30, 2016, we had an additional $150 million in borrowings available to be drawn under a term loan. In addition, we had 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. On October 12, 2016, we repaid a $120.0 million term loan that was scheduled to mature in August 2019.

(6)  The weighted average interest rate on these loans was 2.17% as of September 30, 2016.

(7) The carrying value of these notes reflects an unamortized discount totaling $2.0 millionas of September 30, 2016 and $2.2 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%. 

(8) The carrying value of these notes reflectsan unamortized discount totaling $3.5 millionas of September 30, 2016 and $3.8 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%. 

(9) The carrying value of these notes reflects an unamortized discount totaling $1.8 millionas of September 30, 2016 and $2.1 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.85%. 

(10) The carrying value of these notes reflects an unamortized discount totaling $3.1 millionas of September 30, 2016 and $3.3 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

(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 $483,000 as of September 30, 2016 and $554,000 as of December 31, 2015.

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.  As of September 30, 2016, we were within the compliance requirements of these financial covenants.

We capitalized interest costs of $1.2 million in the three months ended September 30, 2016, $1.5 million in the three months ended September 30, 2015, $4.3 million in the nine months ended September 30, 2016 and $5.6 million in the nine months ended September 30, 2015.

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

	September 30, 2016				December 31, 2015
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Fixed-rate debt
Unsecured Senior Notes	$	1,187,091	$	1,233,860	$	1,185,842	$	1,211,658
Other fixed-rate debt	156,404		162,974		282,716		291,991
Variable-rate debt	530,341		533,079		609,194		610,987
	$	1,873,836	$	1,929,913	$	2,077,752	$	2,114,636

9.    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 Amount			Fixed Rate	Floating Rate Index	Effective Date	Expiration Date	September 30, 2016			December 31, 2015
$	100,000		1.6730%	One-Month LIBOR	9/1/2015	8/1/2019	$	(2,339	)	$	(1,217	)
100,000			1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	(2,500		)	(1,429		)
13,676		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	(236		)	53
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	(4,879		)	(138		)
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	(4,872		)	(45		)
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	(2,446		)	(32		)
100,000			0.8055%	One-Month LIBOR	9/2/2014	9/1/2016	—			(148		)
100,000			0.8100%	One-Month LIBOR	9/2/2014	9/1/2016	—			(151		)
							$	(17,272	)	$	(3,107	)

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

Each of the 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
Derivatives	Balance Sheet Location	September 30, 2016			December 31, 2015
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets	$	—		$	53
Interest rate swaps designated as cash flow hedges	Interest rate derivatives	(17,272		)	(3,160		)

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

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2016		2015			2016			2015
Amount of gain (loss) recognized in accumulated other comprehensive loss (“AOCL”) (effective portion)	$	407	$	(3,638	)	$	(16,581	)	$	(6,720	)
Amount of losses reclassified from AOCL into interest expense (effective portion)	1,043		915			2,763			2,457
Amount of gain (loss) recognized in interest expense (ineffective portion)	1,523		—			(347		)	—

Over the next 12 months, we estimate that approximately $5.2 million of losses will be reclassified from AOCL as an increase to interest expense.

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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 September 30, 2016, the fair value of interest rate derivatives in a liability position related to these agreements was $17.9 million, excluding the effects of accrued interest and credit valuation adjustments. As of September 30, 2016, 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 $18.4 million.

10.    Redeemable Noncontrolling Interests

Our partners in two real estate joint ventures, LW Redstone Company, LLC and Stevens Investors, LLC (discussed further in Note 5), 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 table below sets forth the activity for these redeemable noncontrolling interests (in thousands):

	For the Nine Months Ended September 30,
	2016			2015
Beginning balance	$	19,218		$	18,417
Contributions from noncontrolling interests	22,779			—
Distributions to noncontrolling interests	(21,344		)	(1,098		)
Net income attributable to noncontrolling interests	1,679			1,690
Adjustment to arrive at fair value of interests	516			599
Ending balance	$	22,848		$	19,608

11.    Equity

In September 2016, COPT established a new 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 $200.0 million. This program replaced an ATM stock offering program that we previously had in place.

During the nine months endedSeptember 30, 2016, certain COPLP limited partners redeemed 87,000 common units in COPLP for an equal number of common shares in COPT.

See Note 13 for disclosure of COPT common share and COPLP common unit activity pertaining to our share-based compensation plans.

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12.    Information by Business Segment

We have the following reportable segments: Defense/IT Locations; Regional Office; our operating wholesale data center; and other. We also report on 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); 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). Effective in the quarter ended September 30, 2016, we changed our segment reporting measures to include certain amounts discussed below pertaining to investments in unconsolidated real estate joint ventures (“UJVs”); this change did not affect prior periods reported herein as we did not own any investments in UJVs during such periods prior to July 21, 2016 (see Note 5).

We measure the performance of our segments through the measure we define as net operating income from real estate operations (“NOI from real estate operations”), which includes: real estate revenues and property operating expenses from continuing and discontinued operations; and the net of revenues and property operating expenses of real estate operations owned through UJVs that is allocable to COPT’s ownership interest (“UJV NOI allocable to COPT”). Amounts reported for segment assets represent long-lived assets associated with consolidated operating properties (including the carrying value of properties, intangible assets, deferred leasing costs, deferred rents receivable and lease incentives) and the carrying value of investments in UJVs owning operating properties. Amounts reported as additions to long-lived assets represent additions to existing consolidated operating properties, excluding transfers from non-operating properties, which we report separately.

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The table below reports segment financial information for our reportable segments (in thousands). 

	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		Data Center Shells		Total Defense/IT Locations		Regional Office			Operating Wholesale Data Center			Other			Total
Three Months Ended September 30, 2016
Revenues from real estate operations	$	61,460	$	12,231		$	12,532	$	7,232	$	3,189	$	5,175	$	101,819	$	20,499		$	6,809		$	1,827		$	130,954
Property operating expenses	20,598		4,462			7,599		3,374		1,112		528		37,673		8,155			3,317			807			49,952
UJV NOI allocable to COPT	—		—			—		—		—		1,008		1,008		—			—			—			1,008
NOI from real estate operations	$	40,862	$	7,769		$	4,933	$	3,858	$	2,077	$	5,655	$	65,154	$	12,344		$	3,492		$	1,020		$	82,010
Additions to long-lived assets	$	5,901	$	7,153		$	—	$	2,207	$	2,642	$	—	$	17,903	$	4,168		$	108		$	53		$	22,232
Transfers from non-operating properties	$	5,331	$	308		$	3	$	—	$	3,100	$	25,513	$	34,255	$	(4	)	$	40		$	—		$	34,291
Three Months Ended September 30, 2015
Revenues from real estate operations	$	61,400	$	12,875		$	9,018	$	6,886	$	3,061	$	5,665	$	98,905	$	26,782		$	6,078		$	1,921		$	133,686
Property operating expenses	20,106		5,150			4,553		3,287		888		532		34,516		9,596			4,008			777			48,897
UJV NOI allocable to COPT	—		—			—		—		—		—		—		—			—			—			—
NOI from real estate operations	$	41,294	$	7,725		$	4,465	$	3,599	$	2,173	$	5,133	$	64,389	$	17,186		$	2,070		$	1,144		$	84,789
Additions to long-lived assets	$	7,943	$	1,603		$	—	$	2,084	$	175	$	—	$	11,805	$	129,259		$	—		$	(27	)	$	141,037
Transfers from non-operating properties	$	25,184	$	(91	)	$	591	$	1,408	$	1,207	$	34,287	$	62,586	$	5,505		$	73,804		$	315		$	142,210
Nine Months Ended September 30, 2016
Revenues from real estate operations	$	184,881	$	36,404		$	34,408	$	21,164	$	9,496	$	18,793	$	305,146	$	67,284		$	20,106		$	5,429		$	397,965
Property operating expenses	64,222		13,310			19,863		9,573		3,050		2,164		112,182		26,707			8,629			2,450			149,968
UJV NOI allocable to COPT	—		—			—		—		—		1,008		1,008		—			—			—			1,008
NOI from real estate operations	$	120,659	$	23,094		$	14,545	$	11,591	$	6,446	$	17,637	$	193,972	$	40,577		$	11,477		$	2,979		$	249,005
Additions to long-lived assets	$	19,516	$	13,290		$	—	$	5,710	$	3,561	$	—	$	42,077	$	9,107		$	108		$	363		$	51,655
Transfers from non-operating properties	$	41,850	$	28,158		$	240	$	—	$	3,315	$	81,467	$	155,030	$	104		$	(391	)	$	(11	)	$	154,732
Segment assets at September 30, 2016	$	1,261,337	$	416,886		$	132,722	$	195,244	$	111,310	$	189,746	$	2,307,245	$	453,766		$	234,551		$	31,563		$	3,027,125
Nine Months Ended September 30, 2015
Revenues from real estate operations	$	182,591	$	37,383		$	27,426	$	21,337	$	8,165	$	15,816	$	292,718	$	73,142		$	12,933		$	5,798		$	384,591
Property operating expenses	63,102		16,120			14,665		10,075		2,605		1,726		108,293		26,750			8,441			2,506			145,990
UJV NOI allocable to COPT	—		—			—		—		—		—		—		—			—			—			—
NOI from real estate operations	$	119,489	$	21,263		$	12,761	$	11,262	$	5,560	$	14,090	$	184,425	$	46,392		$	4,492		$	3,292		$	238,601
Additions to long-lived assets	$	16,529	$	86,303		$	—	$	5,446	$	466	$	—	$	108,744	$	198,589		$	108		$	282		$	307,723
Transfers from non-operating properties	$	44,212	$	51,117		$	32,150	$	1,408	$	13,184	$	50,295	$	192,366	$	22,230		$	89,183		$	327		$	304,106
Segment assets at September 30, 2015	$	1,284,712	$	413,321		$	134,790	$	196,105	$	108,541	$	203,090	$	2,340,559	$	695,490		$	246,806		$	71,907		$	3,354,762

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The following table reconciles our segment revenues to total revenues as reported on our consolidated statements of operations (in thousands):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2016		2015		2016		2015
Segment revenues from real estate operations	$	130,954	$	133,686	$	397,965	$	384,591
Construction contract and other service revenues	11,149		17,058		34,372		97,554
Less: Revenues from discontinued operations	—		—		—		(4		)
Total revenues	$	142,103	$	150,744	$	432,337	$	482,141

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 Three Months Ended September 30,				For the Nine Months Ended September 30,
	2016		2015		2016		2015
Segment property operating expenses	$	49,952	$	48,897	$	149,968	$	145,990
Less: Property operating expenses from discontinued operations	—		—		—		6
Total property operating expenses	$	49,952	$	48,897	$	149,968	$	145,996

The following table reconciles UJV NOI allocable to COPT to equity in income of unconsolidated entities as reported on our consolidated statements of operations (in thousands):

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2016			2015		2016			2015
UJV NOI allocable to COPT	$	1,008		$	—	$	1,008		$	—
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(415		)	—		(415		)	—
Add: Equity in income of unconsolidated non-real estate entities	1			18		21			52
Equity in income of unconsolidated entities	$	594		$	18	$	614		$	52

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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Construction contract and other service revenues	$	11,149		$	17,058		$	34,372		$	97,554
Construction contract and other service expenses	(10,341		)	(16,132		)	(32,513		)	(94,923		)
NOI from service operations	$	808		$	926		$	1,859		$	2,631

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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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
NOI from real estate operations	$	82,010		$	84,789		$	249,005		$	238,601
NOI from service operations	808			926			1,859			2,631
Interest and other income	1,391			692			3,877			3,217
Equity in income of unconsolidated entities	594			18			614			52
Income tax (expense) benefit	21			(48		)	28			(153		)
Depreciation and other amortization associated with real estate operations	(32,015		)	(38,403		)	(99,790		)	(103,788		)
Impairment losses	(27,699		)	(2,307		)	(99,837		)	(3,545		)
General, administrative and leasing expenses	(8,855		)	(7,439		)	(28,764		)	(22,864		)
Business development expenses and land carry costs	(1,716		)	(5,573		)	(6,497		)	(10,986		)
Interest expense	(18,301		)	(24,121		)	(64,499		)	(66,727		)
NOI from discontinued operations	—			—			—			(10		)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,008		)	—			(1,008		)	—
(Loss) gain on early extinguishment of debt	(59		)	85,745			(37		)	85,677
(Loss) income from continuing operations	$	(4,829	)	$	94,279		$	(45,049	)	$	122,105

The following table reconciles our segment assets to the consolidated total assets of COPT and subsidiaries (in thousands):

	September 30, 2016		September 30, 2015
Segment assets	$	3,027,125	$	3,354,762
Non-operating property assets	421,364		416,540
Other assets	185,705		140,790
Total COPT consolidated assets	$	3,634,194	$	3,912,092

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) gain on early extinguishment of debt, gain on sales of real estate and equity in income of unconsolidated entities not included in NOI 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, administrative and leasing expenses, business development expenses and land carry costs, interest and other income, income taxes and noncontrolling interests because these items represent general corporate or non-operating property items not attributable to segments.

13.    Share-Based Compensation and Other Compensation Matters

Performance Share Units (“PSUs”)

On March 1, 2016, our Board of Trustees granted 26,299 PSUs with an aggregate grant date fair value of $1.0 million to executives.  The PSUs have a performance period beginning on January 1, 2016 and concluding on the earlier of December 31, 2018 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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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. We computed a grant date fair value of $38.21 per PSU using a Monte Carlo model, which included assumptions of, among other things, the following: baseline common share value of $23.90; expected volatility for COPT common shares of 20.4%; and a risk-free interest rate of 0.96%.  We are recognizing the grant date fair value in connection with these PSU awards over the period commencing on March 1, 2016 and ending on December 31, 2018.

Based on COPT’s total shareholder return relative to its peer group of companies, for PSUs issued in 2014 and 2015, we made the following common share issuances in settlement of such PSUs during the nine months ended September 30, 2016:

• 10,326 shares on May 30, 2016 to Mr. Wayne H. Lingafelter, our former Executive Vice President, Development & Construction Services, who departed on March 31, 2016; and

• 20,569 shares on July 12, 2016 to Mr. Roger A. Waesche, Jr., our former Chief Executive Officer, who departed on May 12, 2016.

Restricted Shares

During the nine months endedSeptember 30, 2016, certain employees were granted a total of 206,487 restricted common shares with an aggregate grant date fair value of $5.0 million (weighted average of $24.31 per share).  Restricted shares 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.  During the nine months endedSeptember 30, 2016, forfeiture restrictions lapsed on 189,569 previously issued common shares; these shares had a weighted average grant date fair value of $27.52 per share, and the aggregate intrinsic value of the shares on the vesting dates was $4.7 million.

Deferred Share Awards

During the nine months endedSeptember 30, 2016, nonemployee members of our Board of Trustees were granted a total of 24,944 deferred share awards with an aggregate grant date fair value of $671,000 ($26.89 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). During the nine months endedSeptember 30, 2016, we issued 12,028 common shares in settlement of deferred share awards granted in 2015; these shares had a grant date fair value of $26.70 per share, and the aggregate intrinsic value of the shares on the settlement date was $322,000.

Executive Transition Costs

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, left the Company to pursue other interests, and he was not nominated for reelection as a Trustee. The Board appointed Mr. Budorick to our Board of Trustees after the 2016 Annual Meeting of Shareholders. In addition, our Executive Vice President, Development & Construction Services, Wayne H. Lingafelter, and our Senior Vice President, General Counsel and Secretary, Karen M. Singer, departed the Company to pursue other interests effective March 31, 2016 and August 31, 2016, respectively. We recognized executive transition costs of approximately $6.0 million in the nine months ended September 30, 2016 primarily for termination benefits in connection with the departures of Mr. Waesche, Mr. Lingafelter and Ms. Singer.

 

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14.    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.

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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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Numerator:
(Loss) income from continuing operations	$	(4,829	)	$	94,279		$	(45,049	)	$	122,105
Gain on sales of real estate, net	34,101			15			34,101			4,000
Preferred share dividends	(3,552		)	(3,552		)	(10,657		)	(10,657		)
Income from continuing operations attributable to noncontrolling interests	(1,973		)	(4,494		)	(2,346		)	(7,322		)
Income from continuing operations attributable to share-based compensation awards	(105		)	(369		)	(319		)	(475		)
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	23,642			85,879			(24,270		)	107,651
Convertible preferred shares	—			372			—			—
Dilutive effect of common units in COPLP on diluted EPS from continuing operations	—			—			—			4,225
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders	$	23,642		$	86,251		$	(24,270	)	$	111,876
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	$	23,642		$	85,879		$	(24,270	)	$	107,651
Discontinued operations	—			—			—			156
Discontinued operations attributable to noncontrolling interests	—			—			—			(3		)
Numerator for basic EPS on net income attributable to COPT common shareholders	23,642			85,879			(24,270		)	107,804
Convertible preferred shares	—			372			—			—
Dilutive effect of common units in COPLP	—			—			—			4,231
Numerator for diluted EPS on net income attributable to COPT common shareholders	$	23,642		$	86,251		$	(24,270	)	$	112,035
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	94,433			94,153			94,312			93,830
Convertible preferred shares	—			434			—			—
Dilutive effect of common units	—			—			—			3,697
Dilutive effect of share-based compensation awards	81			21			—			82
Denominator for diluted EPS (common shares)	94,514			94,608			94,312			97,609
Basic EPS:
(Loss) income from continuing operations attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPT common shareholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Diluted EPS:
(Loss) income from continuing operations attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPT common shareholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15

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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 Three Months Ended September 30,		For the Nine Months Ended September 30,
	2016	2015	2016	2015
Conversion of common units	3,591	3,679	3,648	—
Conversion of Series I Preferred Units	176	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 effects were antidilutive:

• weighted average restricted shares and deferred share awards for the three months ended September 30, 2016 and 2015 of 375,000 and 411,000, respectively, and for the nine months ended September 30, 2016 and 2015 of 394,000 and 412,000, respectively; and

• weighted average options for the three months ended September 30, 2016 and 2015 of 233,000 and 440,000, respectively, and for the nine months ended September 30, 2016 and 2015 of 307,000 and 480,000, respectively.

We had outstanding senior notes, which we redeemed in April 2015, 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.

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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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Numerator:
(Loss) income from continuing operations	$	(4,829	)	$	94,279		$	(45,049	)	$	122,105
Gain on sales of real estate, net	34,101			15			34,101			4,000
Preferred unit distributions	(3,717		)	(3,717		)	(11,152		)	(11,152		)
Income from continuing operations attributable to noncontrolling interests	(913		)	(972		)	(2,803		)	(2,605		)
Income from continuing operations attributable to share-based compensation awards	(105		)	(369		)	(319		)	(475		)
Numerator for basic EPU from continuing operations attributable to COPLP common unitholders	24,537			89,236			(25,222		)	111,873
Convertible preferred units	—			372			—			—
Numerator for diluted EPU from continuing operations attributable to COPLP common unitholders	$	24,537		$	89,608		$	(25,222	)	$	111,873
Numerator for basic EPU from continuing operations attributable to COPLP common unitholders	$	24,537		$	89,236		$	(25,222	)	$	111,873
Discontinued operations	—			—			—			156
Discontinued operations attributable to noncontrolling interests	—			—			—			3
Numerator for basic EPU on net income attributable to COPLP common unitholders	24,537			89,236			(25,222		)	112,032
Convertible preferred units	—			372			—			—
Numerator for diluted EPU on net income attributable to COPLP common unitholders	$	24,537		$	89,608		$	(25,222	)	$	112,032
Denominator (all weighted averages):
Denominator for basic EPU (common units)	98,024			97,832			97,960			97,527
Convertible preferred shares	—			434			—			—
Dilutive effect of share-based compensation awards	81			21			—			82
Denominator for diluted EPU (common units)	98,105			98,287			97,960			97,609
Basic EPU:
(Loss) income from continuing operations attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPLP common unitholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Diluted EPU:
(Loss) income from continuing operations attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPLP common unitholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15

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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 Three Months Ended September 30,		For the Nine Months Ended September 30,
	2016	2015	2016	2015
Conversion of Series I preferred units	176	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 effects were antidilutive:

• weighted average restricted units and deferred share awards for the three months ended September 30, 2016 and 2015 of 375,000 and 411,000, respectively, and for the nine months ended September 30, 2016 and 2015 of 394,000 and 412,000, respectively; and

• weighted average options for the three months ended September 30, 2016 and 2015 of 233,000 and 440,000, respectively, and for the nine months ended September 30, 2016 and 2015 of 307,000 and 480,000, respectively.

We had outstanding senior notes, which we redeemed in April 2015, 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.

15.    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 $1.3 million liability through September 30, 2016 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.

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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 September 30, 2016 follow (in thousands):

Year Ending December 31,
2016 (1)	$	307
2017	1,159
2018	1,113
2019	1,082
2020	1,089
Thereafter	86,806
	$	91,556

(1) Represents the three months ending December 31, 2016.

Contractual Obligations

We had amounts remaining to be incurred under various contractual obligations as of September 30, 2016 that included the following:

• new development and redevelopment obligations of $77.6 million;

• capital expenditures for operating properties of $60.5 million;

• third party construction and development of $10.5 million; and

• purchase obligations of $1.8 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 limited to $19 million in the aggregate. We have insurance coverage in place to mitigate much of any potential future losses that may result from these indemnification agreements.

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Item 2.Management’s Discussion and Analysis of Financial Condition and Results of Operations

Overview

During the nine months endedSeptember 30, 2016: 

• we finished the period with occupancy of our portfolio of operating office properties at 91.3%, including six properties owned through an unconsolidated real estate joint venture;

• we placed into service an aggregate of 545,000 square feet in newly constructed and redeveloped properties that were 86.9% leased as of September 30, 2016;

• we sold:

• 15 operating properties totaling 1.1 million square feet that were 92.1% occupied for $210.7 million and other land for $5.7 million;

• a 50% interest in six triple-net leased, single-tenant data center properties by contributing them into GI-COPT, a newly-formed joint venture, for an aggregate property value of $147.6 million. We obtained $60.0 million in non-recourse mortgage loans on the properties through the joint venture immediately prior to the sale of our interest and received the net proceeds. Our partner in the joint venture acquired the 50% interest from us for $44.3 million;

We used most of the proceeds from these sales to repay borrowings under our Revolving Credit Facility and for general corporate purposes.

• 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, departed the Company to pursue other interests, and he was not nominated for re-election as a Trustee. The Board appointed Mr. Budorick to our Board of Trustees after the 2016 Annual Meeting of Shareholders; and

• our Executive Vice President, Development & Construction Services, Wayne H. Lingafelter, and our Senior Vice President, General Counsel and Secretary, Karen M. Singer, departed the Company to pursue other interests effective March 31, 2016 and August 31, 2016, respectively.

We discuss significant factors contributing to changes in our net income 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; and

• our commitments and contingencies.

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

This section 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. 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;

39

• 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.

Occupancy and Leasing

Office Properties

The tables below set forth occupancy information pertaining to our portfolio of operating office properties, which included six properties owned through an unconsolidated real estate joint venture:

	September 30, 2016			December 31, 2015
Occupancy rates at period end
Total	91.3		%	91.6		%
Defense/IT Locations:
Fort Meade/BW Corridor	93.0		%	94.5		%
Northern Virginia Defense/IT	84.6		%	81.9		%
Lackland Air Force Base	100.0		%	100.0		%
Navy Support Locations	73.6		%	72.1		%
Redstone Arsenal	100.0		%	97.0		%
Data Center Shells	100.0		%	100.0		%
Regional Office	95.3		%	95.4		%
Other	55.1		%	57.3		%
Average contractual annual rental rate per square foot at period end (1)	$	29.53		$	29.55

(1)  Includes estimated expense reimbursements. Amounts reported include the portion of properties owned through an unconsolidated real estate joint venture that was allocable to our ownership interest.

	Rentable Square Feet		Occupied Square Feet
	(in thousands)
December 31, 2015	18,053		16,535
Square feet vacated upon lease expiration (1)	—		(420	)
Occupancy of previously vacated space in connection with new leases (2)	—		389
Square feet constructed or redeveloped	551		502
Dispositions	(1,126	)	(1,036	)
Other changes	10		(1	)
September 30, 2016	17,488		15,969

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

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

During the nine months endedSeptember 30, 2016, we completed 2.3 million square feet of leasing, including 571,000 of construction and redevelopment space, and renewed 78.5% of the square footage of our lease expirations (including the effect of early renewals).

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Occupancy of our Same Office Properties decreased from 91.6% as of December 31, 2015 to 91.4% as of September 30, 2016.

Wholesale Data Center Property

The leased portion of our 19.25 megawatt wholesale data center property decreased from 17.8 megawatts as of December 31, 2015 to 15.8 megawatts as of September 30, 2016 due to a tenant departure.

Results of Operations

We evaluate the operating performance of our properties using NOI from real estate operations, our segment performance measure, which includes: real estate revenues and property operating expenses from continuing and discontinued operations; and the net of revenues and property operating expenses of real estate operations owned through unconsolidated real estate joint ventures (“UJVs”) that is allocable to COPT’s ownership interest (“UJV NOI allocable to COPT”).  We measure the performance of our segments through the measure we define as NOI from real estate operations. We view our NOI from real estate operations as comprising the following primary categories of operating properties:

• office properties continually owned and 100% operational throughout the current and prior year reporting periods, excluding properties held for sale.  We define these as changes from “Same Office Properties”;

• office properties acquired during the current and prior year reporting periods;

• constructed or redeveloped office properties placed into service that were not 100% operational throughout the current and prior year reporting periods;

• our wholesale data center;

• properties held for sale as of September 30, 2016; 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.

We believe that operating income, as reported on our consolidated statements of operations, is the most directly comparable generally accepted accounting principles (“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.

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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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
	(in thousands)
NOI from real estate operations	$	82,010		$	84,789		$	249,005		$	238,601
NOI from service operations	808			926			1,859			2,631
Less: NOI from discontinued operations	—			—			—			(10		)
Less: UJV NOI allocable to COPT	(1,008		)	—			(1,008		)	—
Depreciation and amortization associated with real estate operations	(32,015		)	(38,403		)	(99,790		)	(103,788		)
Impairment losses	(27,699		)	(2,307		)	(99,837		)	(3,545		)
General, administrative and leasing expenses	(8,855		)	(7,439		)	(28,764		)	(22,864		)
Business development expenses and land carry costs	(1,716		)	(5,573		)	(6,497		)	(10,986		)
Operating income	$	11,525		$	31,993		$	14,968		$	100,039

Comparison of Statements of Operations for the Three Months Ended September 30, 2016 and 2015

	For the Three Months Ended September 30,
	2016			2015			Variance
	(in thousands)
Revenues
Revenues from real estate operations	$	130,954		$	133,686		$	(2,732	)
Construction contract and other service revenues	11,149			17,058			(5,909		)
Total revenues	142,103			150,744			(8,641		)
Expenses
Property operating expenses	49,952			48,897			1,055
Depreciation and amortization associated with real estate operations	32,015			38,403			(6,388		)
Construction contract and other service expenses	10,341			16,132			(5,791		)
Impairment losses	27,699			2,307			25,392
General, administrative and leasing expenses	8,855			7,439			1,416
Business development expenses and land carry costs	1,716			5,573			(3,857		)
Total operating expenses	130,578			118,751			11,827
Operating income	11,525			31,993			(20,468		)
Interest expense	(18,301		)	(24,121		)	5,820
Interest and other income	1,391			692			699
(Loss) gain on early extinguishment of debt	(59		)	85,745			(85,804		)
Equity in income of unconsolidated entities	594			18			576
Income tax benefit (expense)	21			(48		)	69
(Loss) income from continuing operations	(4,829		)	94,279			(99,108		)
Gain on sales of real estate	34,101			15			34,086
Net income	$	29,272		$	94,294		$	(65,022	)

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NOI from Real Estate Operations

	For the Three Months Ended September 30,
	2016			2015			Variance
	(Dollars in thousands, except per square foot data)
Revenues
Same Office Properties revenues
Rental revenue, excluding lease termination revenue	$	76,138		$	75,778		$	360
Lease termination revenue	390			185			205
Tenant recoveries and other real estate operations revenue	21,861			19,802			2,059
Same Office Properties total revenues	98,389			95,765			2,624
Constructed and developed office properties placed in service	6,041			3,611			2,430
Acquired office properties	9,221			6,922			2,299
Wholesale data center	6,809			6,078			731
Properties held for sale	5,837			5,680			157
Dispositions	4,517			15,512			(10,995		)
Other	140			118			22
	130,954			133,686			(2,732		)
Property operating expenses
Same Office Properties	37,094			34,176			2,918
Constructed and developed office properties placed in service	1,780			1,014			766
Acquired office properties	4,331			2,750			1,581
Wholesale data center	3,317			4,008			(691		)
Properties held for sale	1,676			2,095			(419		)
Dispositions	1,317			4,858			(3,541		)
Other	437			(4		)	441
	49,952			48,897			1,055
UJV NOI allocable to COPT	1,008			—			1,008
NOI from real estate operations
Same Office Properties	61,295			61,589			(294		)
Constructed and developed office properties placed in service	4,261			2,597			1,664
Acquired office properties	4,890			4,172			718
Wholesale data center	3,492			2,070			1,422
Properties held for sale	4,161			3,585			576
Dispositions	3,200			10,654			(7,454		)
Other	711			122			589
	$	82,010		$	84,789		$	(2,779	)
Same Office Properties rent statistics
Average occupancy rate	91.2		%	91.1		%	0.1		%
Average straight-line rent per occupied square foot (1)	$	6.40		$	6.38		$	0.02

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

Our Same Office Properties pool consisted of 129 office properties, comprising 74.6% of our total operating office square footage as of September 30, 2016 (80.4% excluding the effect of properties held for sale). This pool of properties included the following changes from the pool used for purposes of comparing 2015 and 2014 in our 2015 Annual Report on Form 10-K: the addition of three properties placed in service and 100% operational by January 1, 2015; and the removal of ten same office properties reclassified to held for sale in 2016, seven same office properties disposed in 2016 and two same office properties in which we sold a 50% interest in 2016 that were owned by a UJV as of September 30, 2016.

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Our NOI from constructed office properties placed in service included 11 properties placed in service in 2015 and 2016, and our NOI from acquired office properties included our 2015 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 to higher occupancy in the current period.

NOI from Service Operations

	For the Three Months Ended September 30,
	2016		2015		Variance
	(in thousands)
Construction contract and other service revenues	$	11,149	$	17,058	$	(5,909	)
Construction contract and other service expenses	10,341		16,132		(5,791		)
NOI from service operations	$	808	$	926	$	(118	)

Construction contract and other service revenue and expenses decreased due primarily to a lower 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.

Depreciation and Amortization Expense

The decrease in depreciation and amortization expense was attributable primarily to additional expense recognized in the prior period of $3.8 million on disposed office properties and $3.1 million from our revision of the useful lives of properties that were removed from service for redevelopment.

Impairment Losses

The increase in impairment losses for the current three-month period was attributable to the losses described below in our explanation for the increase for the nine-month period ended September 30, 2016.

Business Development Expenses and Land Carry Costs

The decrease in business development expenses and land carry costs was due primarily to additional expense in the prior period of $2.7 million in acquisition costs expensed in connection with operating property acquisitions and $930,000 in demolition costs on a property undergoing redevelopment.

Interest Expense 

The decrease in interest expense in the current period included: a gain of $1.5 million in hedge ineffectiveness on our interest rate swaps recognized in the current period; the effect of a 9% decrease in our average outstanding debt in the current period relative to the prior period; and $1.3 million in incremental additional interest expense in the prior period under the default rate on a non-recourse loan that we extinguished via conveyance of properties.

(Loss) Gain on Early Extinguishment of Debt

We recognized a gain on early extinguishment of $85.7 million in the prior period 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.

Gain on Sales of Real Estate

We recognized gain on sales of real estate in the current period of $17.9 million on our sale of a 50% interest in six triple-net leased, single-tenant data center properties and $16.2 million in connection with other operating property dispositions.

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Comparison of Statements of Operations for the Nine Months Ended September 30, 2016 and 2015

	For the Nine Months Ended September 30,
	2016			2015			Variance
	(in thousands)
Revenues
Revenues from real estate operations	$	397,965		$	384,587		$	13,378
Construction contract and other service revenues	34,372			97,554			(63,182		)
Total revenues	432,337			482,141			(49,804		)
Expenses
Property operating expenses	149,968			145,996			3,972
Depreciation and amortization associated with real estate operations	99,790			103,788			(3,998		)
Construction contract and other service expenses	32,513			94,923			(62,410		)
Impairment losses	99,837			3,545			96,292
General, administrative and leasing expenses	28,764			22,864			5,900
Business development expenses and land carry costs	6,497			10,986			(4,489		)
Total operating expenses	417,369			382,102			35,267
Operating income	14,968			100,039			(85,071		)
Interest expense	(64,499		)	(66,727		)	2,228
Interest and other income	3,877			3,217			660
(Loss) gain on early extinguishment of debt	(37		)	85,677			(85,714		)
Equity in income of unconsolidated entities	614			52			562
Income tax benefit (expense)	28			(153		)	181
(Loss) income from continuing operations	(45,049		)	122,105			(167,154		)
Discontinued operations	—			156			(156		)
Gain on sales of real estate	34,101			4,000			30,101
Net (loss) income	$	(10,948	)	$	126,261		$	(137,209	)

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NOI from Real Estate Operations

	For the Nine Months Ended September 30,
	2016			2015			Variance
	(Dollars in thousands, except per square foot data)
Revenues
Same Office Properties revenues
Rental revenue, excluding lease termination revenue	$	226,632		$	225,820		$	812
Lease termination revenue	1,679			1,950			(271		)
Tenant recoveries and other real estate operations revenue	64,095			59,168			4,927
Same Office Properties total revenues	292,406			286,938			5,468
Constructed and developed office properties placed in service	15,853			7,032			8,821
Acquired office properties	27,639			11,204			16,435
Wholesale data center	20,106			12,933			7,173
Properties held for sale	17,910			17,954			(44		)
Dispositions	23,671			48,174			(24,503		)
Other	380			356			24
	397,965			384,591			13,374
Property operating expenses
Same Office Properties	110,567			107,185			3,382
Constructed and developed office properties placed in service	4,530			2,051			2,479
Acquired office properties	11,885			4,296			7,589
Wholesale data center	8,629			8,441			188
Properties held for sale	6,391			6,949			(558		)
Dispositions	7,229			17,108			(9,879		)
Other	737			(40		)	777
	149,968			145,990			3,978
UJV NOI allocable to COPT	1,008			—			1,008
NOI from real estate operations
Same Office Properties	181,839			179,753			2,086
Constructed and developed office properties placed in service	11,323			4,981			6,342
Acquired office properties	15,754			6,908			8,846
Wholesale data center	11,477			4,492			6,985
Properties held for sale	11,519			11,005			514
Dispositions	16,442			31,066			(14,624		)
Other	651			396			255
	$	249,005		$	238,601		$	10,404
Same Office Properties rent statistics
Average occupancy rate	91.0		%	91.0		%	—		%
Average straight-line rent per occupied square foot (1)	$	19.10		$	19.02		$	0.08

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

Our NOI from constructed office properties placed in service included 11 properties placed in service in 2015 and 2016, and our NOI from acquired office properties included our 2015 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 to higher occupancy in the current period.

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NOI from Service Operations

	For the Nine Months Ended September 30,
	2016		2015		Variance
	(in thousands)
Construction contract and other service revenues	$	34,372	$	97,554	$	(63,182	)
Construction contract and other service expenses	32,513		94,923		(62,410		)
NOI from service operations	$	1,859	$	2,631	$	(772	)

Construction contract and other service revenue and expenses decreased due primarily to a lower volume of construction activity in connection with several of our tenants.

Impairment Losses

In the first quarter of 2016, we set a goal to raise cash from sales of properties in 2016 considerably in excess of the $96.8 million in assets held for sale at December 31, 2015. The specific properties we would sell to achieve this goal had not been identified when the goal was established. Throughout 2016, we have been in the process of identifying properties we will sell.

In the first quarter of 2016, we reclassified: most of our properties in Greater Philadelphia (included in our Regional Office segment); two properties in the Fort Meade/BW Corridor sub-segment; and our remaining land holdings in Colorado Springs, Colorado to held for sale and recognized $2.4 million of impairment losses. As of March 31, 2016, we had $225.9 million of assets held for sale.

During the second quarter of 2016, as part of our closing process, we conducted our quarterly review of our portfolio for indicators of impairment considering the refined investment strategy of our then newly-appointed Chief Executive Officer and the goals of the asset sales program and concluded that we would: (1) not hold our operating properties in Aberdeen, Maryland (“Aberdeen”) for the long-term; (2) not develop commercial properties on land in Frederick, Maryland; (3) sell specific properties in our Northern Virginia Defense/IT and Fort Meade/BW Corridor sub-segments; and (4) sell the remaining operating property in Greater Philadelphia that had not previously been classified as held for sale. Accordingly, we performed recoverability analyses for each of these properties and recorded the following impairment losses:

• $34.4 million on operating properties in Aberdeen (included in our Other segment). After shortening our estimated holding period for these properties, we determined that the carrying amount of the properties would not likely be recovered from the operation and eventual dispositions of the properties during the shortened holding period. Accordingly, we adjusted the properties to their estimated fair values;

• $4.4 million on land in Aberdeen. In performing our analysis related to the operating properties in Aberdeen, we determined that the weakening leasing and overall commercial real estate conditions in that market indicated that our land holdings in the market may be impaired. As a result, we determined that the carrying amount of the land was not recoverable and adjusted the land to its estimated fair value;

• $8.2 million on land in Frederick, Maryland. We determined that the carrying amount of the land would not likely be recovered from its sale and adjusted the land to its estimated fair value;

• $14.1 million on operating properties in our Northern Virginia and Fort Meade/BW Corridor sub-segments that we reclassified to held for sale during the period whose carrying amounts exceeded their estimated fair values less costs to sell; and

• $6.2 million on the property in Greater Philadelphia (included in our Regional Office segment) that we reclassified to held for sale during the period and adjusted to fair value less costs to sell.

There were no property sales in the second quarter of 2016 and as of June 30, 2016, we had $300.6 million of assets held for sale.

During the third quarter of 2016, as part of our closing process, we conducted our quarterly review of our portfolio for indicators of impairment considering refinements to our disposition strategy made during the third quarter of 2016 to sell an additional operating property in our Northern Virginia Defense/IT sub-segment, an additional operating property in our Fort Meade/BW Corridor sub-segment and our remaining operating properties and land in White Marsh, Maryland (“White Marsh”) that had not previously been classified as held for sale. In connection with our determinations that we planned to sell these properties, we performed recoverability analyses for each of these properties and recorded the following impairment losses:

• $13.3 million on the operating property in our Northern Virginia Defense/IT sub-segment. Communication with a major tenant in the building during the quarter led us to conclude that there was significant uncertainty with respect to

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the tenant renewing its lease expiring in 2019. As a result of this information and continuing sub-market weakness, we determined that this property no longer met our long-term hold strategy and we placed it into our asset sales program. Accordingly, we adjusted the carrying amount of the property to its estimated fair value less costs to sell; and

• $2.9 million on the other properties that we reclassified as held for sale, primarily associated with a land parcel in White Marsh. As of June 30, 2016, this land was under a sales contract subject to a re-zoning contingency. During the third quarter, we were denied favorable re-zoning and the contract was canceled. As a result, we determined this property will be sold as is, reclassified it to held for sale and adjusted its carrying value to its estimated fair value less costs to sell.

During our review we also recognized additional impairment losses of $11.5 million on properties previously classified as held for sale. Approximately $10 million of these losses pertained to properties in White Marsh due to our assessment that certain significant tenants will likely exercise lease termination rights and to reflect market conditions. The remainder of these losses pertained primarily to properties in San Antonio, Texas (in our Other segment), where prospective purchasers reduced offering prices late in the third quarter. We executed property sales of $210.7 million in the third quarter of 2016 (discussed further in Note 4), and had $161.5 million of assets held for sale at September 30, 2016.

Changes in the expected future cash flows due to changes in our plans for specific properties (especially our expected holding period) could result in the recognition of additional impairment losses. In addition, because properties held for sale are carried at the lower of carrying value or estimated fair values less costs to sell, declines in their estimated fair values due to market conditions and other factors could result in the recognition of additional impairment losses.

General, Administrative and Leasing Expenses

The increase in general, administrative and leasing expenses was attributable primarily to $6.0 million in executive transition costs incurred in the current period, mostly in connection with the departures of Mr. Waesche, Mr. Lingafelter and Ms. Singer.

Business Development Expenses and Land Carry Costs

The decrease in business development expenses and land carry costs was due primarily to additional expense in the prior period of $4.1 million in acquisition costs expensed in connection with operating property acquisitions.

(Loss) Gain on Early Extinguishment of Debt

We recognized a gain on early extinguishment of $85.7 million in the prior period as described above for the three-month period.

Gain on Sales of Real Estate

The increase in gain on sales of real estate in the current period was attributable to the gains described for the three month period ended September 30, 2016.

Funds from Operations

Funds from operations (“FFO”) is defined as net income 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. FFO also includes adjustments to net income for the effects of the items noted above pertaining to UJVs that were allocable to our ownership interest in the UJVs. 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.

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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 net income 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 (including separation related compensation and replacement recruitment for Vice President level positions and above); and issuance costs associated with redeemed preferred shares.  This measure also includes adjustments for the effects of the items noted above pertaining to UJVs that were allocable to our ownership interest in the UJVs. We believe this to be a useful supplemental measure alongside Diluted FFO as it excludes gains and losses from certain investing and financing activities and certain other items that we believe are not closely correlated to (or associated with) 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 of 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 $1.3 million in the three months ended September 30, 2015 and $5.3 million in the nine months ended September 30, 2015. We believe that net income is the 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

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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 this to be a useful supplemental measure alongside Diluted FFO per share as it excludes gains and losses from certain investing and financing activities and certain other items that we believe are not closely correlated to (or associated with) our operating performance. 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 table appearing on the following page sets forth the computation of the above stated measures for the three and nine months endedSeptember 30, 2016 and 2015, and provides reconciliations to the GAAP measures of COPT and subsidiaries associated with such measures:

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
	(Dollars and shares in thousands,  except per share data)
Net income (loss)	$	29,272		$	94,294		$	(10,948	)	$	126,261
Add Real estate-related depreciation and amortization	32,015			38,403			99,790			103,788
Add: Depreciation and amortization on UJV allocable to COPT	207			—			207			—
Add: Impairment losses on previously depreciated operating properties	25,857			2,307			81,828			3,779
Add: Gain on sales of previously depreciated operating properties	(34,101		)	(15		)	(34,101		)	(15		)
FFO	53,250			134,989			136,776			233,813
Less: Noncontrolling interests-preferred units in the Operating Partnership	(165		)	(165		)	(495		)	(495		)
Less: FFO allocable to other noncontrolling interests	(894		)	(1,027		)	(2,935		)	(2,769		)
Less: Preferred share dividends	(3,552		)	(3,552		)	(10,657		)	(10,657		)
Basic FFO allocable to share-based compensation awards	(190		)	(541		)	(486		)	(926		)
Basic FFO available to common share and common unit holders	$	48,449		$	129,704		$	122,203		$	218,966
Dividends on dilutive convertible preferred shares	—			372			—			—
Distributions on dilutive preferred units in the Operating Partnership	—			165			—			—
Diluted FFO available to common share and common unit holders	$	48,449		$	130,241		$	122,203		$	218,966
Add: Operating property acquisition costs	—			2,695			—			4,102
Less: Gain on sales of non-operating properties	—			—			—			(3,985		)
Impairment losses on non-operating properties	1,842			—			18,009			—
Losses on interest rate derivatives	(1,523		)	—			347			—
Less: Gain on early extinguishment of debt	59			(85,745		)	37			(86,057		)
Add: Executive transition costs	1,639			—			6,023			—
Add: Negative FFO of properties conveyed to extinguish debt in default	—			2,766			—			10,456
Add: Demolition costs on redevelopment properties	—			930			578			1,171
Less: Diluted FFO comparability adjustments allocable to share-based compensation awards	(5		)	334			(99		)	313
Dividends and distributions on antidilutive preferred securities	—			(537		)	—			—
Diluted FFO available to common share and common unit holders, as adjusted for comparability	$	50,461		$	50,684		$	147,098		$	144,966
Weighted average common shares	94,433			94,153			94,312			93,830
Conversion of weighted average common units	3,591			3,679			3,648			3,697
Weighted average common shares/units - Basic FFO	98,024			97,832			97,960			97,527
Dilutive convertible preferred shares	—			434			—			—
Dilutive convertible preferred units in the Operating Partnership	—			176			—			—
Dilutive effect of share-based compensation awards	81			21			98			82
Weighted average common shares/units - Diluted FFO	98,105			98,463			98,058			97,609
Antidilutive preferred securities for diluted FFO, as adjusted for comparability	—			(610		)	—			—
Weighted average common shares/units - Diluted FFO, as adj. for comparability	98,105			97,853			98,058			97,609
Diluted FFO per share	$	0.49		$	1.32		$	1.25		$	2.24
Diluted FFO per share, as adjusted for comparability	$	0.51		$	0.52		$	1.50		$	1.49
Denominator for diluted EPS	94,514			94,608			94,312			97,609
Weighted average common units	3,591			3,679			3,648			—
Convertible preferred units	—			176			—			—
Anti-dilutive EPS effect of share-based compensation awards	—			—			98			—
Denominator for diluted FFO per share measures	98,105			98,463			98,058			97,609

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Property Additions

The table below sets forth the major components of our additions to properties for the nine months endedSeptember 30, 2016 (in thousands):

Construction, development and redevelopment	$	136,815
Tenant improvements on operating properties	26,226		(1)
Capital improvements on operating properties	14,850
	$	177,891

(1) 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 $22.2 million when comparing the nine months endedSeptember 30, 2016 and 2015. This increase included: a $29.0 million increase in cash flow from construction contracts and other services from 2015 to 2016 due in large part to the timing of cash collections and payments on third party construction services; and a $10.0 million increase in cash flow from real estate operations due primarily to properties acquired and placed in service since the prior period; offset in part by a $15.4 million increase in interest expense paid from the prior to the current period due primarily to the timing of interest payments from new debt requiring interest payments semi-annually rather than monthly.

Net cash flow provided by investing activities increased $449.2 million when comparing the nine months endedSeptember 30, 2016 and 2015 due primarily to: an increase in property sales in 2016 relative to 2015; operating property acquisitions in 2015 when none occurred in 2016; and lower development expenditures in 2016.

Net cash flow used in financing activities in the nine months endedSeptember 30, 2016 was $260.6 million, and included the following:

• dividends and/or distributions to equity holders of $92.2 million; and

• distributions to redeemable noncontrolling interests of $14.3 million related primarily to distributions to our partner in Stevens Investors, LLC, as discussed in Note 5 to the consolidated financial statements; offset in part by

• net proceeds from debt borrowings of $146.0 million.

Net cash flow provided by financing activities in the nine months endedSeptember 30, 2015 was $221.3 million, and included the following:

• net proceeds from debt borrowings of $294.9 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 equity holders of $91.9 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 September 30, 2016, 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.

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 8 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

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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 September 30, 2016, we had $47.6 million in cash and cash equivalents.

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 September 30, 2016, the maximum borrowing capacity under this facility totaled $800.0 million, all of which was available.

In addition, as of September 30, 2016, we have $150.0 million available to be drawn upon under an unsecured term loan that we expect to use for general corporate purposes.

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 in excess of $100 million from sales of interests in properties during the remainder of 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 September 30, 2016 (in thousands):

	For the Periods Ending December 31,
	2016		2017		2018		2019		2020		Thereafter		Total
Contractual obligations (1)
Debt (2)
Balloon payments due upon maturity	$	—	$	—	$	—	$	120,000	$	312,132	$	1,426,832	$	1,858,964
Scheduled principal payments	989		4,061		4,241		4,387		4,024		14,553		32,255
Interest on debt (3)	17,556		70,006		69,832		68,320		62,387		165,716		453,817
New development and redevelopment obligations (4)(5)	33,147		41,620		2,876		—		—		—		77,643
Third-party construction and development obligations (5)(6)	8,380		2,079		—		—		—		—		10,459
Capital expenditures for operating properties (5)(7)	2,946		39,679		17,877		—		—		—		60,502
Operating leases (8)	307		1,159		1,113		1,082		1,089		86,806		91,556
Other obligations	278		730		388		310		120		5		1,831
Total contractual cash obligations	$	63,603	$	159,334	$	96,327	$	194,099	$	379,752	$	1,693,912	$	2,587,027

(1) The contractual obligations set forth in this table exclude property operations contracts that may be terminated with notice of one month or less and also excludes accruals and payables incurred and therefore reflected in our reported liabilities.

(2) Represents scheduled principal amortization payments and maturities only and therefore excludes net debt discounts and deferred financing costs of $17.4 million. On October 12, 2016, we repaid a $120.0 million term loan that was scheduled to mature in 2019 primarily using cash on hand and proceeds from our Revolving Credit Facility.

(3) Represents interest costs for our outstanding debt as of September 30, 2016 for the terms of such debt.  For variable rate debt, the amounts reflected above used September 30, 2016 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.

(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 $30 million on construction and development costs and approximately $20 million on improvements to operating properties (including the commitments set forth in the table above) during the remainder of 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 September 30, 2016, we were in compliance with these financial covenants.

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Off-Balance Sheet Arrangements

On July 21, 2016, we sold a 50% interest in six triple-net leased, single-tenant data center properties in Virginia by contributing them into GI-COPT, a newly-formed joint venture. We account for our 50% interest in the joint venture using the equity method of accounting.

We managed the joint venture’s property operations and earned fees for these services in 2016 since its formation. This joint venture has a two-member management committee that is responsible for making major decisions (as defined in the joint venture agreement) and we control one of the management committee positions. We and our partner receive returns generally in proportion to our investments in the joint venture.

As of September 30, 2016, we had an investment balance in GI-COPT of $25.7 million. Our balance is $18.5 million lower than our share of the joint venture’s equity due to a difference between our cost basis and our share of the underlying equity in the net assets upon formation of the joint venture; we are amortizing this basis difference into equity in income from unconsolidated entities over the lives of the underlying assets. We recognized income on our investment in this joint venture of $593,000 in 2016. We also realized a net cash inflow from this joint venture of $552,000 in 2016. In addition, we earned fees totaling $26,000 from the joint venture in 2016 for property management services.

We had no other material off-balance sheet arrangements during the nine months endedSeptember 30, 2016.

During 2016, we also owned investments in three consolidated joint ventures. We enter into joint ventures such as these from time to time for reasons that include the following: (1) they can provide access to new markets and investment opportunities while enabling us to benefit from the expertise and relationships of our partners; (2) they are an alternative source for raising capital to put towards acquisition or development activities; and (3) they can reduce our exposure to risks associated with a property and its activities. Our consolidated and unconsolidated joint ventures are discussed in Note 5 to our Consolidated Financial Statements.

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.

Recent Accounting Pronouncements

See Note 2 to our consolidated financial statements for information regarding recent accounting pronouncements.

Item 3.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.

The following table sets forth as of September 30, 2016 our debt obligations and weighted average interest rates on debt maturing each year (dollars in thousands):

	For the Periods Ending December 31,
	2016			2017			2018			2019			2020			Thereafter			Total
Debt:
Fixed rate debt (1)	$	900		$	3,692		$	3,858		$	3,991		$	3,718		$	1,341,385		$	1,357,544
Weighted average interest rate	4.33		%	4.34		%	4.37		%	4.36		%	3.96		%	4.30		%	4.30		%
Variable rate debt (2)	$	89		$	369		$	383		$	120,396		$	312,438		$	100,000		$	533,675
Weighted average interest rate (3)	2.37		%	2.37		%	2.37		%	2.62		%	1.95		%	2.33		%	2.17		%

(1) Represents principal maturities only and therefore excludes net discounts and deferred financing costs of $17.4 million.

(2) On October 12, 2016, we repaid a $120.0 million term loan that was scheduled to mature in 2019 primarily using cash on hand and proceeds from our Revolving Credit Facility.

(3) The amounts reflected above used September 30, 2016 interest rates on variable rate debt.

55

The fair value of our debt was $1.9 billion as of September 30, 2016.  If interest rates had been 1% lower, the fair value of our fixed-rate debt would have increased by approximately $103 million as of September 30, 2016.

The following table sets forth information pertaining to interest rate swap contracts in place as of September 30, 2016 and December 31, 2015 and their respective fair values (dollars in thousands):

							Fair Value at
Notional Amount			Fixed Rate	Floating Rate Index	Effective Date	Expiration Date	September 30, 2016			December 31, 2015
$	100,000		1.6730%	One-Month LIBOR	9/1/2015	8/1/2019	$	(2,339	)	$	(1,217	)
100,000			1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	(2,500		)	(1,429		)
13,676		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	(236		)	53
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	(4,879		)	(138		)
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	(4,872		)	(45		)
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	(2,446		)	(32		)
100,000			0.8055%	One-Month LIBOR	9/2/2014	9/1/2016	—			(148		)
100,000			0.8100%	One-Month LIBOR	9/2/2014	9/1/2016	—			(151		)
							$	(17,272	)	$	(3,107	)

(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 $1.7 million in the nine months endedSeptember 30, 2016 if the one-month LIBOR rate was 1% higher.

Item 4.Controls and Procedures

COPT

(a) Evaluation of Disclosure Controls and Procedures

The Company’s management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of its disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) as of September 30, 2016.  Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that the Company’s disclosure controls and procedures as of September 30, 2016 were functioning effectively to provide reasonable assurance that the information required to be disclosed by the Company in reports filed or submitted under the Securities Exchange Act of 1934 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 the Company’s management, including its principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

(b) 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) Evaluation of Disclosure Controls and Procedures

The Operating Partnership’s management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of its disclosure controls and procedures (as defined in Rule 15d-15(e) under the Exchange Act) as of September 30, 2016.  Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that the Operating Partnership’s disclosure controls and procedures as of September 30, 2016 were functioning effectively to provide reasonable assurance that the information required to be disclosed by the Operating Partnership in reports filed or submitted under the Securities Exchange Act of 1934 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 the Operating Partnership’s management, including its principal executive and principal financial officers, or persons performing similar functions, as appropriate to allow timely decisions regarding required disclosure.

56

(b) 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.

PART II

Item 1.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 1A.  Risk Factors

There have been no material changes to the risk factors included in our 2015 Annual Report on Form 10-K.

Item 2.Unregistered Sales of Equity Securities and Use of Proceeds

(a) During the three months ended September 30, 2016, 60,242 of COPLP’s common units were exchanged for 60,242 COPT common shares in accordance with COPLP’s Second Amended and Restated Limited Partnership Agreement, as amended.  The issuance of these common shares was effected in reliance upon the exemption from registration under Section 4(a)(2) of the Securities Act of 1933, as amended.

(b) Not applicable

(c) Not applicable

Item 3.Defaults Upon Senior Securities

(a) Not applicable

(b) Not applicable

Item 4.Mine Safety Disclosures

Not applicable

Item 5.Other Information

On November 1, 2016, we entered into a Letter Agreement (the “2016 Agreement”) with Anthony Mifsud, our Executive Vice President and Chief Financial Officer, regarding Mr. Mifsud’s participation in our Executive Change in Control and Severance Plan (the “Plan”). The 2016 Agreement supersedes a previous Letter Agreement between us and Mr. Mifsud, dated January 19, 2015, pertaining to his participation in the Plan. The 2016 Agreement establishes a five-year participation period for Mr. Mifsud under the Plan, after which he will cease to participate in the Plan unless otherwise agreed to by us and Mr. Mifsud. The previous Letter Agreement had no defined term. Other than to reflect such change, the 2016 Agreement contains no changes in substantive terms.

57

Item 6.Exhibits

(a) Exhibits:

58

EXHIBIT NO.	DESCRIPTION
10.1	Separation Agreement, dated July 26, 2016, between Corporate Office Properties Trust, Corporate Office Properties, L.P., and Karen M. Singer (filed with the Company’s Form 8-K dated July 28, 2016 and incorporated herein by reference).
10.2	First Amendment to Term Loan Agreement, dated as of September 15, 2016, 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).
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).
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).

59

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the undersigned Registrants have duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	CORPORATE OFFICE PROPERTIES TRUST		CORPORATE OFFICE PROPERTIES, L.P.
			By: Corporate Office Properties Trust,
			its General Partner
	/s/ Stephen E. Budorick		/s/ Stephen E. Budorick
	Stephen E. Budorick		Stephen E. Budorick
	President and Chief Executive Officer		President and Chief Executive Officer
	/s/ Anthony Mifsud		/s/ Anthony Mifsud
	Anthony Mifsud		Anthony Mifsud
	Executive Vice President and Chief Financial Officer		Executive Vice President and Chief Financial Officer
Dated:	November 4, 2016	Dated:	November 4, 2016

60

EX-10.2

Exhibit 10.2

FIRST AMENDMENT TO TERM LOAN AGREEMENT

THIS FIRST AMENDMENT TO TERM LOAN AGREEMENT (this “Amendment”) dated as of September 15, 2016, 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”), the Lenders, and CAPITAL ONE, NATIONAL ASSOCIATION, as Administrative Agent (the “Agent”).

WHEREAS, the Borrower, the Parent, the Lenders, the Agent and the other parties thereto have entered into that certain Term Loan Agreement dated as of December 17, 2015 (as amended, supplemented, restated or otherwise modified from time to time, the “Term Loan Agreement”);

WHEREAS, the Borrower, the Parent, the Lenders and the Agent desire to amend certain provisions of the Term Loan Agreement 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 hereby agree as follows:

Section 1.    Definitions. Capitalized terms used in this Amendment and not otherwise defined herein shall have the respective meanings given such terms in the Term Loan Agreement.

Section 2.    Specific Amendments to the Term Loan Agreement. Upon the effectiveness of this Amendment, the parties hereto agree that the Term Loan Agreement is amended as follows:

(a)    The Term Loan Agreement is amended by restating the definition of “Availability Termination Date” in Section 1.1. in its entirety as follows:

“Availability Termination Date” means the first to occur of: (a) December 30, 2016 and (b) the date on which the Commitments are terminated or reduced to zero in accordance herewith.

(b)    The Term Loan Agreement is amended by adding the following subsection (d) at the end of Section 3.6.:

(d)    Termination Fee. If the Availability Termination Date shall occur after September 17, 2016, the Borrower agrees to pay to the Administrative Agent for the account of the Lenders a commitment termination fee equal to 0.50% of the amount of such Lender’s remaining Commitment, if any, on such Availability Termination Date (immediately prior to giving effect to the termination of the

LEGAL02/36628332v1

Commitments on the Availability Termination Date); provided, however, that such fee shall not be payable if the Availability Termination Date resulted from the occurrence of an Event of Default. Such fee shall be due and payable on the Availability Termination Date. The Borrower acknowledges and agrees that the amount payable by it under this subsection (d) in connection with the termination of the aggregate Commitments of the Lenders is a reasonable calculation of such Lenders’ lost profits in view of the difficulties and impracticality of determining actual damages resulting from termination of such Commitments of the Lenders.

Section 3.    Conditions Precedent. The effectiveness of this Amendment is subject to receipt by the Agent of each of the following, each in form and substance satisfactory to the Agent:

(a)    a counterpart of this Amendment duly executed by the Borrower, the Parent and each of the Lenders;

(b)    the Reaffirmation of Obligations substantially in the form of Exhibit A attached hereto duly executed by each Guarantor;

(c)    evidence that all fees, expenses and reimbursement amounts due and payable to the Agent, including without limitation, the reasonable fees and expenses of counsel to the Agent, have been paid; and

(d)    such other documents, instruments and agreements as the Agent may reasonably request.

Section 4.    Representations. The Borrower and the Parent represent and warrant to the Agent and the Lenders that:

(a)    Authorization. Each of the Parent and the Borrower has the right and power, and has taken all necessary action to authorize the execution and delivery of this Amendment and to perform its obligations thereunder and under the Term Loan Agreement, as amended by this Amendment, in accordance with their respective terms. This Amendment has been duly executed and delivered by a duly authorized officer of the Parent and the Borrower or a general partner of the Borrower, as applicable, and both this Amendment and the Term Loan Agreement, as amended by this Amendment, are legal, valid and binding obligations of the Parent and the Borrower and are enforceable against such Persons in accordance with their respective terms except as the enforceability thereof may be limited by bankruptcy, insolvency or similar laws affecting creditors rights generally and the availability of equitable remedies for the enforcement of certain obligations (other than payment of principal) contained herein or therein and as may be limited by equitable principles generally.

(b)    Compliance with Laws, etc. The execution, delivery and performance of this Amendment and the other Loan Documents to which any Loan Party is a party do not and will not, by the passage of time, the giving of notice, or both: (i) require any

2    

Governmental Approval or violate any Applicable Law relating to any Loan Party; (ii) conflict with, result in a breach of or constitute a default under the organizational documents of any Loan Party, or any indenture, agreement or other instrument to which any 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 any Loan Party.

(c)    No Default. No Default or Event of Default has occurred and is continuing as of the date hereof nor will exist immediately after giving effect to this Amendment.

Section 5.    Reaffirmation of Representations. Each of the Parent and the Borrower hereby represents, repeats and reaffirms all representations and warranties made by such Person to the Agent and the Lenders in the Term Loan Agreement and the other Loan Documents to which such Person is a party on and as of the date hereof with the same force and effect as if such representations and warranties were set forth in this Amendment in full 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 on and as of such earlier date) and except for changes in factual circumstances not prohibited under the Loan Documents.

Section 6.    Certain References. Each reference to the Term Loan Agreement in any of the Loan Documents shall be deemed to be a reference to the Term Loan Agreement as amended by this Amendment. This Amendment shall constitute a Loan Document.

Section 7.    Expenses. The Borrower hereby agrees to reimburse the Agent upon demand for all costs and expenses (including attorneys’ fees) incurred by the Agent in connection with the preparation, negotiation and execution of this Amendment and the other agreements and documents executed and delivered in connection herewith.

Section 8.    Benefits. This Amendment shall be binding upon and shall inure to the benefit of the parties hereto and their respective successors and assigns.

Section 9.    GOVERNING LAW. THIS AMENDMENT 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 10.    Effect. Except as expressly herein amended, the terms and conditions of the Term Loan Agreement and the other Loan Documents remain in full force and effect. Except as set forth in this Amendment, this Amendment shall not be construed to be a waiver or amendment of any of the other terms and conditions of the Term Loan Agreement and the other Loan Documents or to limit, impair or otherwise affect the rights and remedies of the Lenders under the Loan Documents. The amendments contained herein shall be deemed to have prospective application only, unless otherwise specifically stated herein.

3    

Section 11. Counterparts. This Amendment may be executed in any number of counterparts, each of which shall be deemed to be an original and shall be binding upon all parties, their successors and assigns.

4    

IN WITNESS WHEREOF, the parties hereto have caused this First Amendment to Term Loan Agreement to be executed as of the date first above written.

CORPORATE OFFICE PROPERTIES, L.P.

By: Corporate Office Properties Trust, its sole

general partner

By: /s/ Scott Robuck

Name: Scott Robuck

Title: VP Finance & Treasurer

CORPORATE OFFICE PROPERTIES TRUST

By: /s/ Scott Robuck

Name: Scott Robuck

Title: VP Finance & Treasurer

[Signatures Continued on Next Page]

LEGAL02/36628332v1

[Signature Page to First Amendment to Term Loan Agreement

with Corporate Office Properties, L.P.]

CAPITAL ONE, NATIONAL ASSOCIATION, as Agent and as a Lender

By: /s/ Frederick H. Denecke

Name: Frederick H. Denecke    

Title: Senior Vice President    

PNC Bank, NATIONAL ASSOCIATION

By: /s/ Katie Chowdhry

Name: Katie Chowdhry    

Title: Vice President

Regions Bank

By: /s/ Kyle D. Upton

Name: Kyle D. Upton    

Title: Vice President

U.S. Bank National Association

By: /s/ Timothy J. Tillman

Name: Timothy J. Tillman    

Title: Vice President

TD Bank, N.A.

By: /s/ Michael Duganich

Name: Michael Duganich    

Title: Vice President

Manufacturers and Traders Trust Company

By: /s/ Isidoros Roros

Name: Isidoros Roros    

Title: Vice President

Branch Banking and Trust Company

By: /s/ Brad Bowen

Name: Brad Bowen    

Title: Vice President

LEGAL02/36628332v1

Exhibit A

REAFFIRMATION OF OBLIGATIONS

September 15, 2016

The undersigned (the “Guarantor”) hereby (a) reaffirms its continuing obligations owing under the Guaranty dated as of December 17, 2015, executed and delivered by the Guarantor (the “Guaranty”) and (b) agrees that the First Amendment to Term Loan Agreement dated the date hereof (the “Amendment”) amending 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 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 Lenders party thereto, and CAPITAL ONE, NATIONAL ASSOCIATION, as Administrative Agent (the “Agent”), and the transactions contemplated by the Amendment, do not in any way affect the validity and enforceability of the Guaranty, or reduce, impair or discharge the obligations of such Guarantor thereunder.

The Guarantor represents and warrants to the Agent and the Lenders that the execution, delivery, and performance of this Reaffirmation of Obligations has been authorized by all requisite action on the part of such Guarantor and will not violate such Guarantor’s organizational or governing documents.

The Guarantor further agrees that references to the Term Loan Agreement contained in any Loan Document (as defined in the Term Loan Agreement) shall be deemed to be references to the Term Loan Agreement, as amended by the Amendment.

This Reaffirmation of Obligations shall be construed in accordance with and be governed by the laws (without giving effect to the conflict of law principles thereof) of the State of New York.

[Signature on Next Page]

LEGAL02/36628332v1

IN WITNESS WHEREOF, the undersigned has duly executed and delivered this Reaffirmation of Obligations as of the date first above written.

CORPORATE OFFICE PROPERTIES TRUST

By: _______________________________    

Name:

Title:

LEGAL02/36628332v1

EX-12.1

EXHIBIT 12.1

Corporate Office Properties Trust

Ratio of Earnings to Combined Fixed Charges and Preferred Share Dividends

(Dollars in thousands)

	Nine Months Ended,
	September 30, 2016
Earnings:
Loss from continuing operations before equity in income of unconsolidated entities and income taxes	$	(45,691	)
Gain on sales of real estate, excluding discontinued operations	34,101
Combined fixed charges and preferred share dividends (from below)	80,479
Amortization of capitalized interest	2,069
Distributed income of equity investees	552
Subtract:
Capitalized interest (from below)	(4,304		)
Preferred share dividends included in fixed charges	(10,657		)
Preferred unit distributions included in fixed charges	(495		)
Preferred distributions of other consolidated entities	(12		)
Total earnings	$	56,042
Combined Fixed Charges and Preferred Share Dividends:
Combined fixed charges and preferred share dividends:
Interest expense on continuing operations	$	64,499
Capitalized interest (internal and external)	4,304
Interest included in rental expense	512
Preferred share dividends	10,657
Preferred unit distributions	495
Preferred distributions of other consolidated entities	12
Total combined fixed charges and preferred share dividends	$	80,479
Ratio of earnings to combined fixed charges and preferred share dividends	0.70
Deficiency	$	24,437

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 of equity investees to income from continuing operations before noncontrolling interests, equity in income 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)

	Nine Months Ended,
Earnings:	September 30, 2016
Loss from continuing operations before equity in income of unconsolidated entities and income taxes	$	(45,691	)
Gain on sales of real estate, excluding discontinued operations	34,101
Fixed charges (from below)	69,327
Amortization of capitalized interest	2,069
Distributed income of equity investees	552
Subtract:
Capitalized interest (from below)	(4,304		)
Preferred distributions of other consolidated entities	(12		)
Total earnings	$	56,042
Fixed charges:
Interest expense on continuing operations	$	64,499
Capitalized interest (internal and external)	4,304
Interest included in rental expense	512
Preferred distributions of other consolidated entities	12
Total fixed charges	$	69,327
Ratio of earnings to fixed charges	0.81
Deficiency	$	13,285

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 of equity investees to income from continuing operations before noncontrolling interests, equity in income of unconsolidated entities and income taxes. Fixed charges consist of interest costs and capitalized amortization of debt issuance costs.

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, Stephen E. Budorick, certify that:

1. I have reviewed this quarterly report on Form 10-Q 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:	November 4, 2016	/s/ Stephen E. Budorick
		Stephen E. Budorick
		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 quarterly report on Form 10-Q 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:	November 4, 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, Stephen E. Budorick, certify that:

1. I have reviewed this quarterly report on Form 10-Q 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:	November 4, 2016	/s/ Stephen E. Budorick
		Stephen E. Budorick
		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 quarterly report on Form 10-Q 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:	November 4, 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 Quarterly Report on Form 10-Q of Corporate Office Properties Trust (the “Company”) for the quarter ended September 30, 2016, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Stephen E. Budorick, 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/ Stephen E. Budorick
Stephen E. Budorick
President and Chief Executive Officer
Date:	November 4, 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 Quarterly Report on Form 10-Q of Corporate Office Properties Trust (the “Company”) for the quarter ended September 30, 2016, 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:	November 4, 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 Quarterly Report on Form 10-Q of Corporate Office Properties, L.P. (the “Company”) for the quarter ended September 30, 2016, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Stephen E. Budorick, 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/ Stephen E. Budorick
Stephen E. Budorick
President and Chief Executive Officer
Date:	November 4, 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 Quarterly Report on Form 10-Q of Corporate Office Properties, L.P. (the “Company”) for the quarter ended September 30, 2016, 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:	November 4, 2016

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 21, 2016
Entity Information [Line Items]
Entity Registrant Name	CORPORATE OFFICE PROPERTIES TRUST
Entity Central Index Key	0000860546
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		94,761,691
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3
Corporate Office Properties, L.P.
Entity Information [Line Items]
Entity Registrant Name	CORPORATE OFFICE PROPERTIES, L.P.
Entity Central Index Key	0001577966
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2016
Document Fiscal Period Focus	Q3

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Properties, net:
Operating properties, net	$ 2,632,069	$ 2,920,529
Projects in development or held for future development	396,269	429,219
Total properties, net	3,028,338	3,349,748
Assets held for sale, net	161,454	96,782
Cash and cash equivalents	47,574	60,310
Restricted cash and marketable securities	7,583	7,716
Investment in unconsolidated real estate joint venture	25,721	0
Accounts receivable (net of allowance for doubtful accounts of $612 and $1,525, respectively)	25,790	29,167
Deferred rent receivable (net of allowance of $330 and $1,962, respectively)	87,526	105,484
Intangible assets on real estate acquisitions, net	84,081	98,338
Deferred leasing costs (net of accumulated amortization of $62,767 and $66,364, respectively)	41,470	53,868
Investing receivables	51,119	47,875
Prepaid expenses and other assets, net	73,538	60,024
Total assets	3,634,194	3,909,312
Liabilities:
Debt, net	1,873,836	2,077,752
Accounts payable and accrued expenses	112,306	91,755
Rents received in advance and security deposits	28,740	37,148
Dividends and distributions payable	30,225	30,178
Deferred revenue associated with operating leases	9,898	19,758
Interest rate derivatives	17,272	3,160
Other liabilities	38,282	13,779
Total liabilities	2,110,559	2,273,530
Commitments and contingencies (Note 15)
Redeemable noncontrolling interests	22,848	19,218
Corporate Office Properties Trust’s shareholders’ equity:
Preferred Shares of beneficial interest at liquidation preference ($0.01 par value; 25,000,000 shares authorized, shares issued and outstanding of 7,431,667 at September 30, 2016 and December 31, 2015)	199,083	199,083
Common Shares of beneficial interest	948	945
Additional paid-in capital	2,008,787	2,004,507
Cumulative distributions in excess of net income	(759,262)	(657,172)
Accumulated other comprehensive loss	(16,314)	(2,838)
Total Corporate Office Properties Trust’s shareholders’ equity	1,433,242	1,544,525
Noncontrolling interests in subsidiaries:
Common units in COPLP	46,757	52,359
Preferred units in COPLP	8,800	8,800
Other consolidated entities	11,988	10,880
Noncontrolling interests in subsidiaries	67,545	72,039
Total equity	1,500,787	1,616,564
Total liabilities, redeemable noncontrolling interest and equity	3,634,194	3,909,312
Corporate Office Properties, L.P.
Properties, net:
Operating properties, net	2,632,069	2,920,529
Projects in development or held for future development	396,269	429,219
Total properties, net	3,028,338	3,349,748
Assets held for sale, net	161,454	96,782
Cash and cash equivalents	47,574	60,310
Restricted cash and marketable securities	2,333	1,953
Investment in unconsolidated real estate joint venture	25,721	0
Accounts receivable (net of allowance for doubtful accounts of $612 and $1,525, respectively)	25,790	29,167
Deferred rent receivable (net of allowance of $330 and $1,962, respectively)	87,526	105,484
Intangible assets on real estate acquisitions, net	84,081	98,338
Deferred leasing costs (net of accumulated amortization of $62,767 and $66,364, respectively)	41,470	53,868
Investing receivables	51,119	47,875
Prepaid expenses and other assets, net	73,538	60,024
Total assets	3,628,944	3,903,549
Liabilities:
Debt, net	1,873,836	2,077,752
Accounts payable and accrued expenses	112,306	91,755
Rents received in advance and security deposits	28,740	37,148
Dividends and distributions payable	30,225	30,178
Deferred revenue associated with operating leases	9,898	19,758
Interest rate derivatives	17,272	3,160
Other liabilities	33,032	8,016
Total liabilities	2,105,309	2,267,767
Commitments and contingencies (Note 15)
Redeemable noncontrolling interests	22,848	19,218
Corporate Office Properties Trust’s shareholders’ equity:
Common Shares of beneficial interest	1,297,858	1,400,745
Accumulated other comprehensive loss	(16,987)	(2,985)
Total Corporate Office Properties Trust’s shareholders’ equity	1,488,754	1,605,643
Noncontrolling interests in subsidiaries:
Noncontrolling interests in subsidiaries	12,033	10,921
Total equity	1,500,787	1,616,564
Total liabilities, redeemable noncontrolling interest and equity	3,628,944	3,903,549
General Partner | Corporate Office Properties, L.P.
Corporate Office Properties Trust’s shareholders’ equity:
Preferred partners' capital accounts	199,083	199,083
Limited Partner | Corporate Office Properties, L.P.
Corporate Office Properties Trust’s shareholders’ equity:
Preferred partners' capital accounts	$ 8,800	$ 8,800

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Allowance for doubtful accounts - AR	$ 612	$ 1,525
Deferred rent receivable	330	1,962
Deferred leasing costs, accumulated amortization	$ 62,767	$ 66,364
Preferred Shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred Shares of beneficial interest, shares authorized	25,000,000	25,000,000
Preferred Shares of beneficial interest, shares issued	7,431,667	7,431,667
Preferred Shares of beneficial interest, shares outstanding	7,431,667	7,431,667
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	94,764,786	94,531,512
Common Shares of beneficial interest, shares outstanding	94,764,786	94,531,512
Corporate Office Properties, L.P.
Allowance for doubtful accounts - AR	$ 612	$ 1,525
Deferred rent receivable	330	1,962
Deferred leasing costs, accumulated amortization	$ 62,767	$ 66,364
Corporate Office Properties, L.P. | General Partner
Common Shares of beneficial interest, shares outstanding	94,764,786	94,531,512
Preferred Units, Outstanding	7,431,667	7,431,667
Corporate Office Properties, L.P. | Limited Partner
Common Shares of beneficial interest, shares outstanding	3,590,391	3,677,391
Preferred Units, Outstanding	352,000	352,000

XML

Consolidated Statements of Operations - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Revenues
Rental revenue		$ 103,956		$ 109,080	$ 316,862		$ 312,826
Tenant recoveries and other real estate operations revenue		26,998		24,606	81,103		71,761
Construction contract and other service revenues		11,149		17,058	34,372		97,554
Total revenues		142,103		150,744	432,337		482,141
Expenses
Property operating expenses		49,952		48,897	149,968		145,996
Depreciation and amortization associated with real estate operations		32,015		38,403	99,790		103,788
Construction contract and other service expenses		10,341		16,132	32,513		94,923
Impairment losses		27,699		2,307	99,837		3,545
General, administrative and leasing expenses		8,855		7,439	28,764		22,864
Business development expenses and land carry costs		1,716		5,573	6,497		10,986
Total operating expenses		130,578		118,751	417,369		382,102
Operating income		11,525		31,993	14,968		100,039
Interest expense		(18,301)		(24,121)	(64,499)		(66,727)
Interest and other income		1,391		692	3,877		3,217
(Loss) gain on early extinguishment of debt		(59)		85,745	(37)		85,677
(Loss) income from continuing operations before equity in income of unconsolidated entities and income taxes		(5,444)		94,309	(45,691)		122,206
Equity in income of unconsolidated entities		594		18	614		52
Income tax benefit (expense)		21		(48)	28		(153)
(Loss) income from continuing operations		(4,829)		94,279	(45,049)		122,105
Discontinued operations		0		0	0		156
(Loss) income before gain on sales of real estate		(4,829)		94,279	(45,049)		122,261
Gain on sales of real estate		34,101		15	34,101		4,000
Net income (loss)		29,272		94,294	(10,948)		126,261
Net (income) loss attributable to noncontrolling interests:
Common units in COPLP		(901)		(3,357)	948		(4,231)
Preferred units in COPLP		(165)		(165)	(495)		(495)
Other consolidated entities		(907)		(972)	(2,799)		(2,599)
Net income (loss) attributable to COPT		27,299		89,800	(13,294)		118,936
Preferred share/unit dividends/distributions		(3,552)		(3,552)	(10,657)		(10,657)
Net income (loss) attributable to COPT common shareholders		23,747		86,248	(23,951)		108,279
Net income (loss) attributable to COPT:
Income (loss) from continuing operations		27,299		89,800	(13,294)		118,783
Discontinued operations, net		0		0	0		153
Net income (loss) attributable to COPT		$ 27,299		$ 89,800	$ (13,294)		$ 118,936
Basic earnings per common share
Income (loss) from continuing operations (in dollars per share/unit)		$ 0.25	[1]	$ 0.91	$ (0.26)	[1]	$ 1.15	[1]
Discontinued operations (in dollars per share/unit)	[1]	0.00		0.00	0.00		0.00
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit)	[1]	0.25		0.91	(0.26)		1.15
Diluted earnings per common share
Income (loss) from continuing operations (in dollars per share/unit)		0.25	[1]	0.91	(0.26)	[1]	1.15	[1]
Discontinued operations (in dollars per share/unit)	[1]	0.00		0.00	0.00		0.00
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit)	[1]	0.25		0.91	(0.26)		1.15
Dividends declared per common share/unit (in dollars per share		$ 0.2750		$ 0.275	$ 0.825		$ 0.825
Corporate Office Properties, L.P.
Revenues
Rental revenue		$ 103,956		$ 109,080	$ 316,862		$ 312,826
Tenant recoveries and other real estate operations revenue		26,998		24,606	81,103		71,761
Construction contract and other service revenues		11,149		17,058	34,372		97,554
Total revenues		142,103		150,744	432,337		482,141
Expenses
Property operating expenses		49,952		48,897	149,968		145,996
Depreciation and amortization associated with real estate operations		32,015		38,403	99,790		103,788
Construction contract and other service expenses		10,341		16,132	32,513		94,923
Impairment losses		27,699		2,307	99,837		3,545
General, administrative and leasing expenses		8,855		7,439	28,764		22,864
Business development expenses and land carry costs		1,716		5,573	6,497		10,986
Total operating expenses		130,578		118,751	417,369		382,102
Operating income		11,525		31,993	14,968		100,039
Interest expense		(18,301)		(24,121)	(64,499)		(66,727)
Interest and other income		1,391		692	3,877		3,217
(Loss) gain on early extinguishment of debt		(59)		85,745	(37)		85,677
(Loss) income from continuing operations before equity in income of unconsolidated entities and income taxes		(5,444)		94,309	(45,691)		122,206
Equity in income of unconsolidated entities		594		18	614		52
Income tax benefit (expense)		21		(48)	28		(153)
(Loss) income from continuing operations		(4,829)		94,279	(45,049)		122,105
Discontinued operations		0		0	0		156
(Loss) income before gain on sales of real estate		(4,829)		94,279	(45,049)		122,261
Gain on sales of real estate		34,101		15	34,101		4,000
Net income (loss)		29,272		94,294	(10,948)		126,261
Net (income) loss attributable to noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated entities		(913)		(972)	(2,803)		(2,602)
Net income (loss) attributable to COPT		28,359		93,322	(13,751)		123,659
Preferred share/unit dividends/distributions		(3,717)		(3,717)	(11,152)		(11,152)
Net income (loss) attributable to COPT common shareholders		24,642		89,605	(24,903)		112,507
Net income (loss) attributable to COPT:
Income (loss) from continuing operations		28,359		93,322	(13,751)		123,500
Discontinued operations, net		0		0	0		159
Net income (loss) attributable to COPT		$ 28,359		$ 93,322	$ (13,751)		$ 123,659
Basic earnings per common share
Income (loss) from continuing operations (in dollars per share/unit)	[2]	$ 0.25		$ 0.91	$ (0.26)		$ 1.15
Discontinued operations (in dollars per share/unit)	[2]	0.00		0.00	0.00		0.00
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit)	[2]	0.25		0.91	(0.26)		1.15
Diluted earnings per common share
Income (loss) from continuing operations (in dollars per share/unit)	[2]	0.25		0.91	(0.26)		1.15
Discontinued operations (in dollars per share/unit)	[2]	0.00		0.00	0.00		0.00
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit)	[2]	0.25		0.91	(0.26)		1.15
Dividends declared per common share/unit (in dollars per share		$ 0.275		$ 0.275	$ 0.825		$ 0.825

[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 - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income (loss)	$ 29,272	$ 94,294	$ (10,948)	$ 126,261
Other comprehensive income (loss)
Unrealized gain (loss) on interest rate derivatives	407	(3,638)	(16,581)	(6,720)
Losses on interest rate derivatives included in interest expense	1,043	915	2,763	2,457
Equity in other comprehensive loss of equity method investee	0	0	(184)	(264)
Other comprehensive income (loss)	1,450	(2,723)	(14,002)	(4,527)
Comprehensive income (loss)	30,722	91,571	(24,950)	121,734
Comprehensive income attributable to noncontrolling interests	(2,025)	(4,453)	(1,820)	(7,324)
Comprehensive income (loss) attributable to COPT	28,697	87,118	(26,770)	114,410
Corporate Office Properties, L.P.
Net income (loss)	29,272	94,294	(10,948)	126,261
Other comprehensive income (loss)
Unrealized gain (loss) on interest rate derivatives	407	(3,638)	(16,581)	(6,720)
Losses on interest rate derivatives included in interest expense	1,043	915	2,763	2,457
Equity in other comprehensive loss of equity method investee	0	0	(184)	(264)
Other comprehensive income (loss)	1,450	(2,723)	(14,002)	(4,527)
Comprehensive income (loss)	30,722	91,571	(24,950)	121,734
Comprehensive income attributable to noncontrolling interests	(913)	(1,035)	(2,803)	(2,780)
Comprehensive income (loss) attributable to COPT	$ 29,809	$ 90,536	$ (27,753)	$ 118,954

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Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Preferred Shares	Common Shares	Additional Paid-in Capital	Cumulative Distributions in Excess of Net Income	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests	Corporate Office Properties, L.P.	Corporate Office Properties, L.P. Common Shares	Corporate Office Properties, L.P. Accumulated Other Comprehensive Income (Loss)	Corporate Office Properties, L.P. Noncontrolling Interests	Corporate Office Properties, L.P. Limited Partner	Corporate Office Properties, L.P. Limited Partner Preferred Shares	Corporate Office Properties, L.P. General Partner	Corporate Office Properties, L.P. General Partner Preferred Shares
Balance (COPT: 93,255,284 shares and 94,531,512 shares as of December 31, 2014 and 2015, respectively) 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
Balance (preferred units) at Dec. 31, 2014													352,000		7,431,667
Balance (in units/ shares) at Dec. 31, 2014	93,255,284								97,092,835
Increase (Decrease) in Shareholders' Equity
Conversion of common units to common shares (COPT: 160,160 and 87,000 shares for the nine months ended September 30, 2015 and 2016, 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 (COPT: 890,241 shares for the nine months ended September 30, 2015)	$ 26,535		9	26,526				26,535	$ 26,535
Exercise of share options (in units/shares)	76,474								76,474
Exercise of share options (COPT: 76,474 shares for the nine months ended September 30, 2015)	$ 2,008		0	2,008				2,008	$ 2,008
Share-based compensation issuance, net of redemptions (in units/shares)	151,511								151,511
Share-based compensation issuance, net of redemptions (COPT: 151,511 and 146,274 shares issued, net of redemptions for the nine months ended September 30, 2015 and 2016, respectively)	$ 5,600		1	5,599				5,600	$ 5,600
Redemption of vested equity awards	(2,330)			(2,330)				(2,330)	(2,330)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	0			(591)			591
Comprehensive income (loss)	120,044				118,936	(4,526)	5,634	120,044	112,507	(4,705)	1,090		$ 495		$ 10,657
Dividends / Distributions to owners of common and preferred units	(88,658)				(88,658)			(92,188)	(81,036)				$ (495)		$ (10,657)
Distributions to owners of common and preferred units in COPLP	(3,530)						(3,530)
Distributions to noncontrolling interests in subsidiaries	(47)						(47)	(47)			(47)
Adjustment to arrive at fair value of redeemable noncontrolling interest	$ (599)			(599)				(599)	$ (599)
Balance (in units/ shares) at Sep. 30, 2015	94,533,670								98,211,061
Balance (preferred units) at Sep. 30, 2015													352,000		7,431,667
Balance (COPT: 94,533,670 shares and 94,764,786 shares as of September 30, 2015 and 2016, respectively) at Sep. 30, 2015	$ 1,579,907	199,083	945	2,002,730	(686,986)	(5,823)	69,958	1,579,907	$ 1,367,904	(6,086)	10,206		$ 8,800		$ 199,083
Balance (COPT: 93,255,284 shares and 94,531,512 shares as of December 31, 2014 and 2015, respectively) 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
Balance (preferred units) at Dec. 31, 2015												352,000	352,000	7,431,667	7,431,667
Balance (in units/ shares) at Dec. 31, 2015	94,531,512								98,208,903			3,677,391		94,531,512
Increase (Decrease) in Shareholders' Equity
Conversion of common units to common shares (COPT: 160,160 and 87,000 shares for the nine months ended September 30, 2015 and 2016, respectively)	$ 0		1	1,166			(1,167)
Costs associated with common shares issued to the public	$ (5)			(5)				(5)	$ (5)
Share-based compensation issuance, net of redemptions (in units/shares)	146,274								146,274
Share-based compensation issuance, net of redemptions (COPT: 151,511 and 146,274 shares issued, net of redemptions for the nine months ended September 30, 2015 and 2016, respectively)	$ 6,177		2	6,175				6,177	$ 6,177
Redemption of vested equity awards	(2,179)			(2,179)				(2,179)	(2,179)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	0			(42)			42
Comprehensive income (loss)	(26,629)				(13,294)	(13,476)	141	(26,629)	(24,903)	(14,002)	1,124		$ 495		$ 10,657
Dividends / Distributions to owners of common and preferred units	(88,796)				(88,796)			(92,294)	(81,142)				$ (495)		$ (10,657)
Distributions to owners of common and preferred units in COPLP	(3,498)						(3,498)
Distributions to noncontrolling interests in subsidiaries	(12)						(12)	(12)			(12)
Adjustment to arrive at fair value of redeemable noncontrolling interest	(516)			(516)				(516)	(516)
Tax loss from share-based compensation	$ (319)			(319)				(319)	$ (319)
Balance (in units/ shares) at Sep. 30, 2016	94,764,786								98,355,177.000			3,590,391		94,764,786
Balance (preferred units) at Sep. 30, 2016												352,000	352,000	7,431,667	7,431,667
Balance (COPT: 94,533,670 shares and 94,764,786 shares as of September 30, 2015 and 2016, respectively) at Sep. 30, 2016	$ 1,500,787	$ 199,083	$ 948	$ 2,008,787	$ (759,262)	$ (16,314)	$ 67,545	$ 1,500,787	$ 1,297,858	$ (16,987)	$ 12,033		$ 8,800		$ 199,083

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Consolidated Statements of Equity (Parenthetical) - shares	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Balance (in units/ shares)	94,764,786	94,533,670	94,531,512	93,255,284
Conversion of common units to common shares (in units/ shares)	87,000	160,160
Exercise of share options (in units/shares)		76,474
Share-based compensation issuance, net of redemptions (in units/shares)	146,274	151,511
Common Shares
Issuance of common units resulting from common shares issued under at-the-market program (in units)		890,241

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Cash flows from operating activities
Revenues from real estate operations received	$ 391,511	$ 373,607
Construction contract and other service revenues received	54,399	104,817
Property operating expenses paid	(154,203)	(146,274)
Construction contract and other service expenses paid	(33,169)	(112,614)
General, administrative, leasing, business development and land carry costs paid	(27,879)	(29,620)
Interest expense paid	(61,662)	(46,278)
Interest and other income received	472	4,130
Other	504	(26)
Net cash provided by operating activities	169,973	147,742
Cash flows from investing activities
Construction, development and redevelopment	(121,297)	(174,434)
Acquisitions of operating properties and related intangible assets	0	(202,866)
Tenant improvements on operating properties	(26,055)	(18,129)
Other capital improvements on operating properties	(22,063)	(12,610)
Proceeds from dispositions of properties	210,661	45,066
Proceeds from partial sale of properties, net of related debt	43,686	0
Investing receivables payments received	0	5,114
Leasing costs paid	(6,024)	(8,603)
Other	(991)	(4,827)
Net cash provided by (used in) investing activities	77,917	(371,289)
Proceeds from debt
Revolving Credit Facility	362,500	422,000
Unsecured senior notes	0	296,580
Other debt proceeds	105,000	50,000
Repayments of debt
Revolving Credit Facility	(406,000)	(418,000)
Scheduled principal amortization	(4,454)	(5,011)
Other debt repayments	(203,056)	(50,681)
Deferred financing costs paid	(825)	(5,377)
Net proceeds from issuance of common shares/units	(46)	28,567
Common share/unit dividends/distributions paid	(78,072)	(77,641)
Preferred share/unit dividends/distributions paid	(10,657)	(10,657)
Distributions paid to noncontrolling interests in COPLP	(3,476)	(3,581)
Distributions paid to redeemable noncontrolling interests	(14,329)	0
Redemption of vested equity awards	(2,179)	(2,330)
Other	(5,032)	(2,559)
Net cash (used in) provided by financing activities	(260,626)	221,310
Net decrease in cash and cash equivalents	(12,736)	(2,237)
Cash and cash equivalents
Beginning of period	60,310	6,077
End of period	47,574	3,840
Reconciliation of net (loss) income to net cash provided by operating activities:
Net (loss) income	(10,948)	126,261
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and other amortization	101,429	105,397
Impairment losses	99,797	3,779
Losses on interest rate derivatives	347	0
Amortization of deferred financing costs and net debt discounts	4,456	4,144
Increase in deferred rent receivable	(930)	(11,939)
Gain on sales of real estate	(34,101)	(4,000)
Share-based compensation	5,637	4,949
Loss (gain) on early extinguishment of debt	34	(86,075)
Other	(2,761)	1,922
Operating changes in assets and liabilities:
Decrease in accounts receivable	3,658	6,526
Decrease (increase) in restricted cash and marketable securities	18	(1,102)
Increase in prepaid expenses and other assets, net	(19,778)	(5,228)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	31,523	(655)
(Decrease) increase in rents received in advance and security deposits	(8,408)	3,763
Net cash provided by operating activities	169,973	147,742
Supplemental schedule of non-cash investing and financing activities:
Increase (decrease) in accrued capital improvements, leasing and other investing activity costs	9,963	(11,722)
Increase in property and redeemable noncontrolling interests in connection with property contributed in a joint venture	22,600	0
Decrease in redeemable noncontrolling interests and increase in other liabilities in connection with distribution payable to redeemable noncontrolling interest	6,683	0
Decrease in properties, net	(114,597)	0
Increase in investment in unconsolidated real estate joint venture	25,680	0
Decrease in debt	59,534	0
Other net decreases in assets and liabilities	3,619	0
Debt assumed on acquisition of operating property	0	55,490
Other liabilities assumed on acquisition of operating properties	0	5,265
Decrease in property in connection with surrender of property in settlement of debt	0	(82,738)
Decrease in debt in connection with surrender of property in settlement of debt	0	(150,000)
Decrease in fair value of derivatives applied to accumulated other comprehensive loss and noncontrolling interests	(13,817)	(4,263)
Equity in other comprehensive loss of an equity method investee	(184)	(264)
Dividends/distributions payable	30,225	30,182
Decrease in noncontrolling interests and increase in shareholders’ equity in connection with the conversion of common units into common shares	1,167	2,151
Adjustments to noncontrolling interests resulting from changes in COPLP ownership	42	591
Increase in redeemable noncontrolling interest and decrease in equity to carry redeemable noncontrolling interest at fair value	516	599
Corporate Office Properties, L.P.
Cash flows from operating activities
Revenues from real estate operations received	391,511	373,607
Construction contract and other service revenues received	54,399	104,817
Property operating expenses paid	(154,203)	(146,274)
Construction contract and other service expenses paid	(33,169)	(112,614)
General, administrative, leasing, business development and land carry costs paid	(27,879)	(29,620)
Interest expense paid	(61,662)	(46,278)
Interest and other income received	472	4,130
Other	504	(26)
Net cash provided by operating activities	169,973	147,742
Cash flows from investing activities
Construction, development and redevelopment	(121,297)	(174,434)
Acquisitions of operating properties and related intangible assets	0	(202,866)
Tenant improvements on operating properties	(26,055)	(18,129)
Other capital improvements on operating properties	(22,063)	(12,610)
Proceeds from dispositions of properties	210,661	45,066
Proceeds from partial sale of properties, net of related debt	43,686	0
Investing receivables payments received	0	5,114
Leasing costs paid	(6,024)	(8,603)
Other	(991)	(4,827)
Net cash provided by (used in) investing activities	77,917	(371,289)
Proceeds from debt
Revolving Credit Facility	362,500	422,000
Unsecured senior notes	0	296,580
Other debt proceeds	105,000	50,000
Repayments of debt
Revolving Credit Facility	(406,000)	(418,000)
Scheduled principal amortization	(4,454)	(5,011)
Other debt repayments	(203,056)	(50,681)
Deferred financing costs paid	(825)	(5,377)
Net proceeds from issuance of common shares/units	(46)	28,567
Common share/unit dividends/distributions paid	(81,053)	(80,727)
Preferred share/unit dividends/distributions paid	(11,152)	(11,152)
Distributions paid to redeemable noncontrolling interests	(14,329)	0
Redemption of vested equity awards	(2,179)	(2,330)
Other	(5,032)	(2,559)
Net cash (used in) provided by financing activities	(260,626)	221,310
Net decrease in cash and cash equivalents	(12,736)	(2,237)
Cash and cash equivalents
Beginning of period	60,310	6,077
End of period	47,574	3,840
Reconciliation of net (loss) income to net cash provided by operating activities:
Net (loss) income	(10,948)	126,261
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Depreciation and other amortization	101,429	105,397
Impairment losses	99,797	3,779
Losses on interest rate derivatives	347	0
Amortization of deferred financing costs and net debt discounts	4,456	4,144
Increase in deferred rent receivable	(930)	(11,939)
Gain on sales of real estate	(34,101)	(4,000)
Share-based compensation	5,637	4,949
Loss (gain) on early extinguishment of debt	34	(86,075)
Other	(2,761)	1,922
Operating changes in assets and liabilities:
Decrease in accounts receivable	3,658	6,526
Decrease (increase) in restricted cash and marketable securities	(495)	(1,485)
Increase in prepaid expenses and other assets, net	(19,778)	(5,228)
Increase (decrease) in accounts payable, accrued expenses and other liabilities	32,036	(272)
(Decrease) increase in rents received in advance and security deposits	(8,408)	3,763
Net cash provided by operating activities	169,973	147,742
Supplemental schedule of non-cash investing and financing activities:
Increase (decrease) in accrued capital improvements, leasing and other investing activity costs	9,963	(11,722)
Increase in property and redeemable noncontrolling interests in connection with property contributed in a joint venture	22,600	0
Decrease in redeemable noncontrolling interests and increase in other liabilities in connection with distribution payable to redeemable noncontrolling interest	6,683	0
Decrease in properties, net	(114,597)	0
Increase in investment in unconsolidated real estate joint venture	25,680	0
Decrease in debt	59,534	0
Other net decreases in assets and liabilities	3,619	0
Debt assumed on acquisition of operating property	0	55,490
Other liabilities assumed on acquisition of operating properties	0	5,265
Decrease in property in connection with surrender of property in settlement of debt	0	(82,738)
Decrease in debt in connection with surrender of property in settlement of debt	0	(150,000)
Decrease in fair value of derivatives applied to accumulated other comprehensive loss and noncontrolling interests	(13,817)	(4,263)
Equity in other comprehensive loss of an equity method investee	(184)	(264)
Dividends/distributions payable	30,225	30,182
Increase in redeemable noncontrolling interest and decrease in equity to carry redeemable noncontrolling interest at fair value	$ 516	$ 599

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Organization

9 Months Ended

Sep. 30, 2016

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 September 30, 2016, our properties included the following:

• 168 operating office properties totaling 17.5 million square feet, including 12 triple-net leased, single-tenant data center properties. We owned six of these properties through an unconsolidated real estate joint venture;

• 10 office properties under, or contractually committed for, construction or redevelopment that we estimate will total approximately 1.2 million square feet upon completion, including two partially operational properties

included above and two properties completed but held for future lease to the United States Government;

• 1,358 acres of land we control that we believe could be developed into approximately 16.2 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 September 30, 2016, 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

9 Months Ended

Sep. 30, 2016

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.

These interim financial statements should be read together with the consolidated financial statements and notes thereto as of and for the year ended December 31, 2015 included in our 2015 Annual Report on Form 10-K.  The unaudited consolidated financial statements include all adjustments that are necessary, in the opinion of management, to fairly state our financial position and results of operations.  All adjustments are of a normal recurring nature.  The consolidated financial statements have been prepared using the accounting policies described in our 2015 Annual Report on Form 10-K.

Recent Accounting Pronouncements

We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) effective January 1, 2016 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. Our adoption of this guidance did not affect on our reported consolidated financial statements.

We adopted guidance issued by the FASB effective January 1, 2016 modifying the analysis that must be performed by us in determining whether we should consolidate certain types of legal entities. The guidance did not amend the existing disclosure requirements for VIEs or voting interest model entities.  The guidance, however, modified the requirements to qualify under the voting interest model. Under the revised guidance, COPLP is considered a variable interest entity of COPT. As COPLP was already consolidated in the balance sheets of COPT, the identification of COPLP as a variable interest entity had no impact on the consolidated financial statements.  There were no other legal entities qualifying under the scope of the revised guidance that were consolidated as a result of the adoption.  In addition, there were no voting interest entities under prior existing guidance determined to be variable interest entities under the revised guidance.  

We adopted effective January 1, 2016 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. Our adoption of this guidance did not affect our reported consolidated financial statements.

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 February 2016, the FASB issued guidance that sets forth principles for the recognition, measurement, presentation and disclosure of leases.  This guidance requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. The resulting classification determines whether the lease expense is recognized based on an effective interest method or straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases. The guidance requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases.  This guidance is effective for reporting periods beginning after December 15, 2018, with early adoption permitted. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In March 2016, the FASB issued guidance intended to simplify certain aspects of the accounting for employee based share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the consolidated statement of cash flows. This guidance is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods, with early adoption permitted. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In June 2016, the FASB issued guidance that changes how entities measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current incurred loss model with an expected loss approach, resulting in a more timely recognition of such losses. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In August 2016, the FASB issued guidance that clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows with the objective of reducing the existing diversity in practice related to eight specific cash flow issues. The guidance is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

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 $5.3 million as of September 30, 2016, 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 September 30, 2016, 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.

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 6, 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 8, we estimated the fair value of our unsecured 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 as of 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 6 for investing receivables, Note 8 for debt and Note 9 for interest rate derivatives. 

COPT and Subsidiaries

The table below sets forth financial assets and liabilities of COPT and its subsidiaries that are accounted for at fair value on a recurring basis as of September 30, 2016 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
Assets:
Marketable securities in deferred compensation plan (1)
Mutual funds	$	5,160	$	—	$	—	$	5,160
Other	90		—		—		90
Total assets	$	5,250	$	—	$	—	$	5,250
Liabilities:
Deferred compensation plan liability (2)	$	—	$	5,250	$	—	$	5,250
Interest rate derivatives	—		17,272		—		17,272
Total liabilities	$	—	$	22,522	$	—	$	22,522

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

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

COPLP and Subsidiaries

The table below sets forth financial assets and liabilities of COPLP and its subsidiaries that are accounted for at fair value on a recurring basis as of September 30, 2016 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
Liabilities:
Interest rate derivatives	$	—	$	17,272	$	—	$	17,272

Nonrecurring Fair Value Measurements

In the first quarter of 2016, we set a goal to raise cash from sales of properties in 2016 considerably in excess of the $96.8 million in assets held for sale at December 31, 2015. The specific properties we would sell to achieve this goal had not been identified when the goal was established. Throughout 2016, we have been in the process of identifying properties we will sell.

In the first quarter of 2016, we reclassified: most of our properties in Greater Philadelphia (included in our Regional Office segment); two properties in the Fort Meade/BW Corridor sub-segment; and our remaining land holdings in Colorado Springs, Colorado to held for sale and recognized $2.4 million of impairment losses. As of March 31, 2016, we had $225.9 million of assets held for sale.

During the second quarter of 2016, as part of our closing process, we conducted our quarterly review of our portfolio for indicators of impairment considering the refined investment strategy of our then newly-appointed Chief Executive Officer and the goals of the asset sales program and concluded that we would: (1) not hold our operating properties in Aberdeen, Maryland (“Aberdeen”) for the long-term; (2) not develop commercial properties on land in Frederick, Maryland; (3) sell specific properties in our Northern Virginia Defense/IT and Fort Meade/BW Corridor sub-segments; and (4) sell the remaining operating property in Greater Philadelphia that had not previously been classified as held for sale. Accordingly, we performed recoverability analyses for each of these properties and recorded the following impairment losses:

• $34.4 million on operating properties in Aberdeen (included in our Other segment). After shortening our estimated holding period for these properties, we determined that the carrying amount of the properties would not likely be recovered from the operation and eventual dispositions of the properties during the shortened holding period. Accordingly, we adjusted the properties to their estimated fair values;

• $4.4 million on land in Aberdeen. In performing our analysis related to the operating properties in Aberdeen, we determined that the weakening leasing and overall commercial real estate conditions in that market indicated that our land holdings in the market may be impaired. As a result, we determined that the carrying amount of the land was not recoverable and adjusted the land to its estimated fair value;

• $8.2 million on land in Frederick, Maryland. We determined that the carrying amount of the land would not likely be recovered from its sale and adjusted the land to its estimated fair value;

• $14.1 million on operating properties in our Northern Virginia and Fort Meade/BW Corridor sub-segments that we reclassified to held for sale during the period whose carrying amounts exceeded their estimated fair values less costs to sell; and

• $6.2 million on the property in Greater Philadelphia (included in our Regional Office segment) that we reclassified to held for sale during the period and adjusted to fair value less costs to sell.

There were no property sales in the second quarter of 2016 and as of June 30, 2016, we had $300.6 million of assets held for sale.

During the third quarter of 2016, as part of our closing process, we conducted our quarterly review of our portfolio for indicators of impairment considering refinements to our disposition strategy made during the third quarter of 2016 to sell an additional operating property in our Northern Virginia Defense/IT sub-segment, an additional operating property in our Fort Meade/BW Corridor sub-segment and our remaining operating properties and land in White Marsh, Maryland (“White Marsh”) that had not previously been classified as held for sale. In connection with our determinations that we planned to sell these properties, we performed recoverability analyses for each of these properties and recorded the following impairment losses:

• $13.3 million on the operating property in our Northern Virginia Defense/IT sub-segment. Communication with a major tenant in the building during the quarter led us to conclude that there was significant uncertainty with respect to the tenant renewing its lease expiring in 2019. As a result of this information and continuing sub-market weakness, we determined that this property no longer met our long-term hold strategy and we placed it into our asset sales program. Accordingly, we adjusted the carrying amount of the property to its estimated fair value less costs to sell; and

• $2.9 million on the other properties that we reclassified as held for sale, primarily associated with a land parcel in White Marsh. As of June 30, 2016, this land was under a sales contract subject to a re-zoning contingency. During the third quarter, we were denied favorable re-zoning and the contract was canceled. As a result, we determined this property will be sold as is, reclassified it to held for sale and adjusted its carrying value to its estimated fair value less costs to sell.

During our review we also recognized additional impairment losses of $11.5 million on properties previously classified as held for sale. Approximately $10 million of these losses pertained to properties in White Marsh due to our assessment that certain significant tenants will likely exercise lease termination rights and to reflect market conditions. The remainder of these losses pertained primarily to properties in San Antonio, Texas (in our Other segment), where prospective purchasers reduced offering prices late in the third quarter. We executed property sales of $210.7 million in the third quarter of 2016 (discussed further in Note 4), and had $161.5 million of assets held for sale at September 30, 2016.

Changes in the expected future cash flows due to changes in our plans for specific properties (especially our expected holding period) could result in the recognition of additional impairment losses. In addition, because properties held for sale are carried at the lower of carrying value or estimated fair values less costs to sell, declines in their estimated fair values due to market conditions and other factors could result in the recognition of additional impairment losses.

The table below sets forth the fair value hierarchy of the valuation technique we used to determine nonrecurring fair value measurements of these assets as of September 30, 2016 (dollars in thousands):

	Fair Values as of September 30, 2016
	Quoted Prices in				Significant
	Active Markets for		Significant Other		Unobservable
	Identical Assets		Observable Inputs		Inputs
Description	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Assets held for sale, net	$	—	$	—	$	127,128	$	127,128

The table below sets forth quantitative information about significant unobservable inputs used for the Level 3 fair value measurements reported above as of September 30, 2016 (dollars in thousands):

Valuation Technique	Fair Values on  Measurement Date		Unobservable Input	Range (Weighted Average)
Contracts to sell	$	87,983	Contract amounts	N/A
Discounted cash flow	$	36,693	Discount rate	9.5% - 11.3% (10.5%)
			Terminal capitalization rate	8.3% - 9.5% (8.7%)
Yield analyses	$	2,452	Investor yield requirement	9.0% (1)

(1) Only one fair value applied for this unobservable input.

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Properties, Net

9 Months Ended

Sep. 30, 2016

Real Estate [Abstract]

Properties, Net

Properties, Net

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

	September 30, 2016			December 31, 2015
Land	$	424,627		$	463,305
Buildings and improvements	2,888,918			3,157,587
Less: Accumulated depreciation	(681,476		)	(700,363		)
Operating properties, net	$	2,632,069		$	2,920,529

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

	September 30, 2016		December 31, 2015
Land	$	199,038	$	207,774
Development in progress, excluding land	197,231		221,445
Projects in development or held for future development	$	396,269	$	429,219

Our properties held for sale included:

• as of September 30, 2016: nine operating properties in White Marsh (included primarily in our Regional Office segment); two operating properties in our Northern Virginia Defense/IT sub-segment; six operating properties in our Fort Meade/BW Corridor sub-segment; two operating properties in San Antonio, Texas (included in our Other segment); and land in White Marsh, Northern Virginia and Colorado Springs; and

• as of December 31, 2015: 13 operating properties in White Marsh (included in our Regional Office segment); two operating properties in San Antonio, Texas (included in our Other segment); and land in Northern Virginia and Colorado Springs.

The table below sets forth the components of assets held for sale on our consolidated balance sheet for these properties (in thousands):

	September 30, 2016		December 31, 2015
Properties, net	$	147,236	$	90,188
Deferred rent receivable	6,642		2,891
Intangible assets on real estate acquisitions, net	1,540		1,591
Deferred leasing costs, net	4,901		1,391
Lease incentives, net	1,135		721
Assets held for sale, net	$	161,454	$	96,782

Acquisitions

We acquired the following operating properties in 2015:

• 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 (in the Northern Virginia region) 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.

These properties contributed:

• revenues of $9.2 million for the three months ended September 30, 2016, $6.9 million for the three months ended September 30, 2015, $27.6 million for the nine months ended September 30, 2016 and $11.2 million for the nine months ended September 30, 2015; and

• net income from continuing operations of $432,000 for the three months ended September 30, 2016, $487,000 for the three months ended September 30, 2015, $2.4 million for the nine months ended September 30, 2016 and $697,000 for the nine months ended September 30, 2015.

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 September 30, 2016. 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 operating property acquisition costs to the nine months ended September 30, 2014 from the 2015 periods in which they were actually incurred. 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 share amounts).

	For the Three Months Ended September 30, 2015		For the Nine Months Ended September 30, 2015
	(Unaudited)
Pro forma total revenues	$	152,736	$	498,657
Pro forma net income attributable to COPT common shareholders	$	88,836	$	112,941
Pro forma EPS:
Basic	$	0.94	$	1.20
Diluted	$	0.94	$	1.20

2016 Dispositions

During the nine months ended September 30, 2016, 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		Gain on Disposition
Arborcrest Corporate Campus (1)	Philadelphia, PA	Regional Office	8/4/2016	4	654,000	$	142,800	$	4,742
8003 Corporate Drive	White Marsh, MD	Regional Office	8/17/2016	1	18,000	2,400		—
1341 & 1343 Ashton Road	Hanover, MD	Fort Meade/BW Corridor	9/9/2016	2	25,000	2,900		848
8007, 8013, 8015, 8019 and 8023-8027 Corporate Drive (1)	White Marsh, MD	Regional Office	9/21/2016	5	130,000	14,513		1,906
1302, 1304 and 1306 Concourse Drive	Linthicum, MD	Fort Meade/BW Corridor	9/29/2016	3	299,000	48,100		8,683
				15	1,126,000	$	210,713	$	16,179

(1) This disposition also included land.

We also sold:

• a 50% interest in six triple-net leased, single-tenant data center properties in Virginia by contributing them into a newly-formed joint venture, GI-COPT DC Partnership LLC (“GI-COPT”), for an aggregate property value of $147.6 million on July 21, 2016. We obtained $60.0 million in non-recourse mortgage loans on the properties through the joint venture immediately prior to the sale of our interest and received the net proceeds. Our partner in the joint venture acquired the 50% interest in the joint venture from us for $44.3 million. We account for our 50% interest in the joint venture using the equity method of accounting as described further in Note 5. We recognized a partial gain on the sale of our interest of $17.9 million; and

• other land for $5.7 million, with no gain recognized.

2016 Construction Activities

During the nine months endedSeptember 30, 2016, we placed into service 490,000 square feet in five newly constructed office properties (including a partially operational property) and 55,000 square feet in two redeveloped properties (including a partially operational property). As of September 30, 2016, we had seven office properties under construction, or for which we were contractually committed to construct, that we estimate will total 1.1 million square feet upon completion (including two properties completed but held for future lease to the United States Government) and three office properties under redevelopment that we estimate will total 104,000 square feet upon completion.

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Real Estate Joint Ventures

9 Months Ended

Sep. 30, 2016

Equity Method Investments and Joint Ventures [Abstract]

Real Estate Joint Ventures

Real Estate Joint Ventures

Consolidated Joint Ventures

The table below sets forth information pertaining to our investments in consolidated real estate joint ventures as of September 30, 2016 (dollars in thousands):

		Nominal
		Ownership		September 30, 2016				(1)
	Date	% as of		Total		Encumbered		Total
	Acquired	9/30/2016	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	157,168	$	80,154	$	53,056
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	66,053		47,006		45,807
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	40,282		—		7,680
				$	263,503	$	127,160	$	106,543

(1) Excludes amounts eliminated in consolidation.

(2) This joint venture’s properties are in Huntsville, Alabama.

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

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

In January 2016, our partner in Stevens Investors, LLC contributed to the joint venture, for a value of $22.6 million, interests in contracts controlling land to be developed (including a purchase agreement and a ground lease). Our partner subsequently received a cash distribution from the joint venture of $13.4 million, which was funded by us. Our partner is also entitled to receive an additional distribution from the joint venture of $6.7 million to be funded by us (expected in 2017) that was reported in other liabilities on our consolidated balance sheet as of September 30, 2016.

Unconsolidated Joint Venture

As described further in Note 4, on July 21, 2016, we sold a 50% interest in six triple-net leased, single-tenant data center properties in Virginia by contributing them into GI-COPT, a newly-formed joint venture. We account for our 50% interest in the joint venture using the equity method of accounting. As of September 30, 2016, we had an investment balance in GI-COPT of $25.7 million. Our balance is $18.5 million lower than our share of the joint venture’s equity due to a difference between our cost basis and our share of the underlying equity in the net assets upon formation of the joint venture; we are amortizing this basis difference into equity in income from unconsolidated entities over the lives of the underlying assets. Under the terms of the joint venture agreement, we and our partner receive returns in proportion to our investments in the joint venture.

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Investing Receivables

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Investing Receivables

Investing Receivables

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

	September 30, 2016		December 31, 2015
Notes receivable from the City of Huntsville	$	48,098	$	44,875
Other investing loans receivable	3,021		3,000
	$	51,119	$	47,875

Our notes receivable from the City of Huntsville funded infrastructure costs in connection with our LW Redstone Company, LLC joint venture (see Note 5) and carry an interest rate of 9.95%.

We did not have an allowance for credit losses in connection with our investing receivables as of September 30, 2016 or December 31, 2015.  The fair value of these receivables approximated their carrying amounts as of September 30, 2016 and December 31, 2015.

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Prepaid Expenses and Other Assets, Net

9 Months Ended

Sep. 30, 2016

Prepaid Expense and Other Assets [Abstract]

Prepaid Expenses and Other Assets, Net

Prepaid Expenses and Other Assets, Net

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

	September 30, 2016		December 31, 2015
Prepaid expenses	$	28,752	$	23,009
Lease incentives, net	19,106		11,133
Construction contract costs incurred in excess of billings	6,367		3,261
Furniture, fixtures and equipment, net	5,492		6,004
Deferred financing costs, net (1)	3,812		5,867
Deferred tax asset, net (2)	3,282		3,467
Other assets	6,727		7,283
Prepaid expenses and other assets, net	$	73,538	$	60,024

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

(2) Includes a valuation allowance of $2.1 million.

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Debt, Net

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Debt, Net

Debt, Net

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

	Carrying Value (1) as of					Scheduled Maturity
	September 30, 2016		December 31, 2015		Stated Interest Rates as of	as of
					September 30, 2016	September 30, 2016
Mortgage and Other Secured Loans:
Fixed rate mortgage loans (2)	$	154,976	$	281,208	3.82% - 7.87% (3)	2019-2026
Variable rate secured loans	13,529		49,792		LIBOR + 1.85% (4)	October 2020
Total mortgage and other secured loans	168,505		331,000
Revolving Credit Facility	—		43,500		LIBOR + 0.875% to 1.60%	May 2019
Term Loan Facilities (5)	516,812		515,902		LIBOR + 0.90% to 2.60% (6)	2019-2022
Unsecured Senior Notes
3.600%, $350,000 aggregate principal	347,024		346,714		3.60% (7)	May 2023
5.250%, $250,000 aggregate principal	246,063		245,731		5.25% (8)	February 2024
3.700%, $300,000 aggregate principal	297,725		297,378		3.70% (9)	June 2021
5.000%, $300,000 aggregate principal	296,279		296,019		5.00% (10)	July 2025
Unsecured notes payable	1,428		1,508		0% (11)	2026
Total debt, net	$	1,873,836	$	2,077,752

(1) The carrying values of our loans other than the Revolving Credit Facility reflect net deferred financing costs of $6.9 million as of September 30, 2016 and $8.0 million as of December 31, 2015.

(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 $440,000 as of September 30, 2016 and $514,000 as of December 31, 2015.

(3) The weighted average interest rate on our fixed rate mortgage loans was 4.20% as of September 30, 2016.

(4)  The interest rate on our variable rate secured loan as of September 30, 2016 was 2.37%.

(5)   As of September 30, 2016, we had an additional $150 million in borrowings available to be drawn under a term loan. In addition, we had 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. On October 12, 2016, we repaid a $120.0 million term loan that was scheduled to mature in August 2019.

(6)  The weighted average interest rate on these loans was 2.17% as of September 30, 2016.

(7) The carrying value of these notes reflects an unamortized discount totaling $2.0 millionas of September 30, 2016 and $2.2 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%. 

(8) The carrying value of these notes reflectsan unamortized discount totaling $3.5 millionas of September 30, 2016 and $3.8 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%. 

(9) The carrying value of these notes reflects an unamortized discount totaling $1.8 millionas of September 30, 2016 and $2.1 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.85%. 

(10) The carrying value of these notes reflects an unamortized discount totaling $3.1 millionas of September 30, 2016 and $3.3 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

(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 $483,000 as of September 30, 2016 and $554,000 as of December 31, 2015.

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.  As of September 30, 2016, we were within the compliance requirements of these financial covenants.

We capitalized interest costs of $1.2 million in the three months ended September 30, 2016, $1.5 million in the three months ended September 30, 2015, $4.3 million in the nine months ended September 30, 2016 and $5.6 million in the nine months ended September 30, 2015.

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

	September 30, 2016				December 31, 2015
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Fixed-rate debt
Unsecured Senior Notes	$	1,187,091	$	1,233,860	$	1,185,842	$	1,211,658
Other fixed-rate debt	156,404		162,974		282,716		291,991
Variable-rate debt	530,341		533,079		609,194		610,987
	$	1,873,836	$	1,929,913	$	2,077,752	$	2,114,636

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Interest Rate Derivatives

9 Months Ended

Sep. 30, 2016

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 Amount			Fixed Rate	Floating Rate Index	Effective Date	Expiration Date	September 30, 2016			December 31, 2015
$	100,000		1.6730%	One-Month LIBOR	9/1/2015	8/1/2019	$	(2,339	)	$	(1,217	)
100,000			1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	(2,500		)	(1,429		)
13,676		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	(236		)	53
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	(4,879		)	(138		)
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	(4,872		)	(45		)
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	(2,446		)	(32		)
100,000			0.8055%	One-Month LIBOR	9/2/2014	9/1/2016	—			(148		)
100,000			0.8100%	One-Month LIBOR	9/2/2014	9/1/2016	—			(151		)
							$	(17,272	)	$	(3,107	)

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

Each of the 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
Derivatives	Balance Sheet Location	September 30, 2016			December 31, 2015
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets	$	—		$	53
Interest rate swaps designated as cash flow hedges	Interest rate derivatives	(17,272		)	(3,160		)

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

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2016		2015			2016			2015
Amount of gain (loss) recognized in accumulated other comprehensive loss (“AOCL”) (effective portion)	$	407	$	(3,638	)	$	(16,581	)	$	(6,720	)
Amount of losses reclassified from AOCL into interest expense (effective portion)	1,043		915			2,763			2,457
Amount of gain (loss) recognized in interest expense (ineffective portion)	1,523		—			(347		)	—

Over the next 12 months, we estimate that approximately $5.2 million of losses will be reclassified from AOCL 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 September 30, 2016, the fair value of interest rate derivatives in a liability position related to these agreements was $17.9 million, excluding the effects of accrued interest and credit valuation adjustments. As of September 30, 2016, 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 $18.4 million.

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Redeemable Noncontrolling Interests

9 Months Ended

Sep. 30, 2016

Noncontrolling Interest [Abstract]

Redeemable Noncontrolling Interests

Redeemable Noncontrolling Interests

Our partners in two real estate joint ventures, LW Redstone Company, LLC and Stevens Investors, LLC (discussed further in Note 5), 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 table below sets forth the activity for these redeemable noncontrolling interests (in thousands):

	For the Nine Months Ended September 30,
	2016			2015
Beginning balance	$	19,218		$	18,417
Contributions from noncontrolling interests	22,779			—
Distributions to noncontrolling interests	(21,344		)	(1,098		)
Net income attributable to noncontrolling interests	1,679			1,690
Adjustment to arrive at fair value of interests	516			599
Ending balance	$	22,848		$	19,608

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Equity

9 Months Ended

Sep. 30, 2016

Equity [Abstract]

Equity

Equity

In September 2016, COPT established a new 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 $200.0 million. This program replaced an ATM stock offering program that we previously had in place.

During the nine months endedSeptember 30, 2016, certain COPLP limited partners redeemed 87,000 common units in COPLP for an equal number of common shares in COPT.

See Note 13 for disclosure of COPT common share and COPLP common unit activity pertaining to our share-based compensation plans.

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Information by Business Segment

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Information by Business Segment

Information by Business Segment

We have the following reportable segments: Defense/IT Locations; Regional Office; our operating wholesale data center; and other. We also report on 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); 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). Effective in the quarter ended September 30, 2016, we changed our segment reporting measures to include certain amounts discussed below pertaining to investments in unconsolidated real estate joint ventures (“UJVs”); this change did not affect prior periods reported herein as we did not own any investments in UJVs during such periods prior to July 21, 2016 (see Note 5).

We measure the performance of our segments through the measure we define as net operating income from real estate operations (“NOI from real estate operations”), which includes: real estate revenues and property operating expenses from continuing and discontinued operations; and the net of revenues and property operating expenses of real estate operations owned through UJVs that is allocable to COPT’s ownership interest (“UJV NOI allocable to COPT”). Amounts reported for segment assets represent long-lived assets associated with consolidated operating properties (including the carrying value of properties, intangible assets, deferred leasing costs, deferred rents receivable and lease incentives) and the carrying value of investments in UJVs owning operating properties. Amounts reported as additions to long-lived assets represent additions to existing consolidated operating properties, excluding transfers from non-operating properties, which we report separately.

The table below reports segment financial information for our reportable segments (in thousands). 

	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		Data Center Shells		Total Defense/IT Locations		Regional Office			Operating Wholesale Data Center			Other			Total
Three Months Ended September 30, 2016
Revenues from real estate operations	$	61,460	$	12,231		$	12,532	$	7,232	$	3,189	$	5,175	$	101,819	$	20,499		$	6,809		$	1,827		$	130,954
Property operating expenses	20,598		4,462			7,599		3,374		1,112		528		37,673		8,155			3,317			807			49,952
UJV NOI allocable to COPT	—		—			—		—		—		1,008		1,008		—			—			—			1,008
NOI from real estate operations	$	40,862	$	7,769		$	4,933	$	3,858	$	2,077	$	5,655	$	65,154	$	12,344		$	3,492		$	1,020		$	82,010
Additions to long-lived assets	$	5,901	$	7,153		$	—	$	2,207	$	2,642	$	—	$	17,903	$	4,168		$	108		$	53		$	22,232
Transfers from non-operating properties	$	5,331	$	308		$	3	$	—	$	3,100	$	25,513	$	34,255	$	(4	)	$	40		$	—		$	34,291
Three Months Ended September 30, 2015
Revenues from real estate operations	$	61,400	$	12,875		$	9,018	$	6,886	$	3,061	$	5,665	$	98,905	$	26,782		$	6,078		$	1,921		$	133,686
Property operating expenses	20,106		5,150			4,553		3,287		888		532		34,516		9,596			4,008			777			48,897
UJV NOI allocable to COPT	—		—			—		—		—		—		—		—			—			—			—
NOI from real estate operations	$	41,294	$	7,725		$	4,465	$	3,599	$	2,173	$	5,133	$	64,389	$	17,186		$	2,070		$	1,144		$	84,789
Additions to long-lived assets	$	7,943	$	1,603		$	—	$	2,084	$	175	$	—	$	11,805	$	129,259		$	—		$	(27	)	$	141,037
Transfers from non-operating properties	$	25,184	$	(91	)	$	591	$	1,408	$	1,207	$	34,287	$	62,586	$	5,505		$	73,804		$	315		$	142,210
Nine Months Ended September 30, 2016
Revenues from real estate operations	$	184,881	$	36,404		$	34,408	$	21,164	$	9,496	$	18,793	$	305,146	$	67,284		$	20,106		$	5,429		$	397,965
Property operating expenses	64,222		13,310			19,863		9,573		3,050		2,164		112,182		26,707			8,629			2,450			149,968
UJV NOI allocable to COPT	—		—			—		—		—		1,008		1,008		—			—			—			1,008
NOI from real estate operations	$	120,659	$	23,094		$	14,545	$	11,591	$	6,446	$	17,637	$	193,972	$	40,577		$	11,477		$	2,979		$	249,005
Additions to long-lived assets	$	19,516	$	13,290		$	—	$	5,710	$	3,561	$	—	$	42,077	$	9,107		$	108		$	363		$	51,655
Transfers from non-operating properties	$	41,850	$	28,158		$	240	$	—	$	3,315	$	81,467	$	155,030	$	104		$	(391	)	$	(11	)	$	154,732
Segment assets at September 30, 2016	$	1,261,337	$	416,886		$	132,722	$	195,244	$	111,310	$	189,746	$	2,307,245	$	453,766		$	234,551		$	31,563		$	3,027,125
Nine Months Ended September 30, 2015
Revenues from real estate operations	$	182,591	$	37,383		$	27,426	$	21,337	$	8,165	$	15,816	$	292,718	$	73,142		$	12,933		$	5,798		$	384,591
Property operating expenses	63,102		16,120			14,665		10,075		2,605		1,726		108,293		26,750			8,441			2,506			145,990
UJV NOI allocable to COPT	—		—			—		—		—		—		—		—			—			—			—
NOI from real estate operations	$	119,489	$	21,263		$	12,761	$	11,262	$	5,560	$	14,090	$	184,425	$	46,392		$	4,492		$	3,292		$	238,601
Additions to long-lived assets	$	16,529	$	86,303		$	—	$	5,446	$	466	$	—	$	108,744	$	198,589		$	108		$	282		$	307,723
Transfers from non-operating properties	$	44,212	$	51,117		$	32,150	$	1,408	$	13,184	$	50,295	$	192,366	$	22,230		$	89,183		$	327		$	304,106
Segment assets at September 30, 2015	$	1,284,712	$	413,321		$	134,790	$	196,105	$	108,541	$	203,090	$	2,340,559	$	695,490		$	246,806		$	71,907		$	3,354,762

The following table reconciles our segment revenues to total revenues as reported on our consolidated statements of operations (in thousands):

	For the Three Months Ended September 30,				For the Nine Months Ended September 30,
	2016		2015		2016		2015
Segment revenues from real estate operations	$	130,954	$	133,686	$	397,965	$	384,591
Construction contract and other service revenues	11,149		17,058		34,372		97,554
Less: Revenues from discontinued operations	—		—		—		(4		)
Total revenues	$	142,103	$	150,744	$	432,337	$	482,141

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 Three Months Ended September 30,				For the Nine Months Ended September 30,
	2016		2015		2016		2015
Segment property operating expenses	$	49,952	$	48,897	$	149,968	$	145,990
Less: Property operating expenses from discontinued operations	—		—		—		6
Total property operating expenses	$	49,952	$	48,897	$	149,968	$	145,996

The following table reconciles UJV NOI allocable to COPT to equity in income of unconsolidated entities as reported on our consolidated statements of operations (in thousands):

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2016			2015		2016			2015
UJV NOI allocable to COPT	$	1,008		$	—	$	1,008		$	—
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(415		)	—		(415		)	—
Add: Equity in income of unconsolidated non-real estate entities	1			18		21			52
Equity in income of unconsolidated entities	$	594		$	18	$	614		$	52

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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Construction contract and other service revenues	$	11,149		$	17,058		$	34,372		$	97,554
Construction contract and other service expenses	(10,341		)	(16,132		)	(32,513		)	(94,923		)
NOI from service operations	$	808		$	926		$	1,859		$	2,631

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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
NOI from real estate operations	$	82,010		$	84,789		$	249,005		$	238,601
NOI from service operations	808			926			1,859			2,631
Interest and other income	1,391			692			3,877			3,217
Equity in income of unconsolidated entities	594			18			614			52
Income tax (expense) benefit	21			(48		)	28			(153		)
Depreciation and other amortization associated with real estate operations	(32,015		)	(38,403		)	(99,790		)	(103,788		)
Impairment losses	(27,699		)	(2,307		)	(99,837		)	(3,545		)
General, administrative and leasing expenses	(8,855		)	(7,439		)	(28,764		)	(22,864		)
Business development expenses and land carry costs	(1,716		)	(5,573		)	(6,497		)	(10,986		)
Interest expense	(18,301		)	(24,121		)	(64,499		)	(66,727		)
NOI from discontinued operations	—			—			—			(10		)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,008		)	—			(1,008		)	—
(Loss) gain on early extinguishment of debt	(59		)	85,745			(37		)	85,677
(Loss) income from continuing operations	$	(4,829	)	$	94,279		$	(45,049	)	$	122,105

The following table reconciles our segment assets to the consolidated total assets of COPT and subsidiaries (in thousands):

	September 30, 2016		September 30, 2015
Segment assets	$	3,027,125	$	3,354,762
Non-operating property assets	421,364		416,540
Other assets	185,705		140,790
Total COPT consolidated assets	$	3,634,194	$	3,912,092

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) gain on early extinguishment of debt, gain on sales of real estate and equity in income of unconsolidated entities not included in NOI 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, administrative and leasing expenses, business development expenses and land carry costs, interest and other income, income taxes and noncontrolling interests because these items represent general corporate or non-operating property items not attributable to segments.

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Share-Based Compensation and Other Compensation Matters

9 Months Ended

Sep. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Share-Based Compensation and Other Compensation Matters

Share-Based Compensation and Other Compensation Matters

Performance Share Units (“PSUs”)

On March 1, 2016, our Board of Trustees granted 26,299 PSUs with an aggregate grant date fair value of $1.0 million to executives.  The PSUs have a performance period beginning on January 1, 2016 and concluding on the earlier of December 31, 2018 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. We computed a grant date fair value of $38.21 per PSU using a Monte Carlo model, which included assumptions of, among other things, the following: baseline common share value of $23.90; expected volatility for COPT common shares of 20.4%; and a risk-free interest rate of 0.96%.  We are recognizing the grant date fair value in connection with these PSU awards over the period commencing on March 1, 2016 and ending on December 31, 2018.

Based on COPT’s total shareholder return relative to its peer group of companies, for PSUs issued in 2014 and 2015, we made the following common share issuances in settlement of such PSUs during the nine months ended September 30, 2016:

• 10,326 shares on May 30, 2016 to Mr. Wayne H. Lingafelter, our former Executive Vice President, Development & Construction Services, who departed on March 31, 2016; and

• 20,569 shares on July 12, 2016 to Mr. Roger A. Waesche, Jr., our former Chief Executive Officer, who departed on May 12, 2016.

Restricted Shares

During the nine months endedSeptember 30, 2016, certain employees were granted a total of 206,487 restricted common shares with an aggregate grant date fair value of $5.0 million (weighted average of $24.31 per share).  Restricted shares 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.  During the nine months endedSeptember 30, 2016, forfeiture restrictions lapsed on 189,569 previously issued common shares; these shares had a weighted average grant date fair value of $27.52 per share, and the aggregate intrinsic value of the shares on the vesting dates was $4.7 million.

Deferred Share Awards

During the nine months endedSeptember 30, 2016, nonemployee members of our Board of Trustees were granted a total of 24,944 deferred share awards with an aggregate grant date fair value of $671,000 ($26.89 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). During the nine months endedSeptember 30, 2016, we issued 12,028 common shares in settlement of deferred share awards granted in 2015; these shares had a grant date fair value of $26.70 per share, and the aggregate intrinsic value of the shares on the settlement date was $322,000.

Executive Transition Costs

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, left the Company to pursue other interests, and he was not nominated for reelection as a Trustee. The Board appointed Mr. Budorick to our Board of Trustees after the 2016 Annual Meeting of Shareholders. In addition, our Executive Vice President, Development & Construction Services, Wayne H. Lingafelter, and our Senior Vice President, General Counsel and Secretary, Karen M. Singer, departed the Company to pursue other interests effective March 31, 2016 and August 31, 2016, respectively. We recognized executive transition costs of approximately $6.0 million in the nine months ended September 30, 2016 primarily for termination benefits in connection with the departures of Mr. Waesche, Mr. Lingafelter and Ms. Singer.

 

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Earnings Per Share ("EPS") and Earnings Per Unit ("EPU")

9 Months Ended

Sep. 30, 2016

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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Numerator:
(Loss) income from continuing operations	$	(4,829	)	$	94,279		$	(45,049	)	$	122,105
Gain on sales of real estate, net	34,101			15			34,101			4,000
Preferred share dividends	(3,552		)	(3,552		)	(10,657		)	(10,657		)
Income from continuing operations attributable to noncontrolling interests	(1,973		)	(4,494		)	(2,346		)	(7,322		)
Income from continuing operations attributable to share-based compensation awards	(105		)	(369		)	(319		)	(475		)
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	23,642			85,879			(24,270		)	107,651
Convertible preferred shares	—			372			—			—
Dilutive effect of common units in COPLP on diluted EPS from continuing operations	—			—			—			4,225
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders	$	23,642		$	86,251		$	(24,270	)	$	111,876
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	$	23,642		$	85,879		$	(24,270	)	$	107,651
Discontinued operations	—			—			—			156
Discontinued operations attributable to noncontrolling interests	—			—			—			(3		)
Numerator for basic EPS on net income attributable to COPT common shareholders	23,642			85,879			(24,270		)	107,804
Convertible preferred shares	—			372			—			—
Dilutive effect of common units in COPLP	—			—			—			4,231
Numerator for diluted EPS on net income attributable to COPT common shareholders	$	23,642		$	86,251		$	(24,270	)	$	112,035
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	94,433			94,153			94,312			93,830
Convertible preferred shares	—			434			—			—
Dilutive effect of common units	—			—			—			3,697
Dilutive effect of share-based compensation awards	81			21			—			82
Denominator for diluted EPS (common shares)	94,514			94,608			94,312			97,609
Basic EPS:
(Loss) income from continuing operations attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPT common shareholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Diluted EPS:
(Loss) income from continuing operations attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPT common shareholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15

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 Three Months Ended September 30,		For the Nine Months Ended September 30,
	2016	2015	2016	2015
Conversion of common units	3,591	3,679	3,648	—
Conversion of Series I Preferred Units	176	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 effects were antidilutive:

• weighted average restricted shares and deferred share awards for the three months ended September 30, 2016 and 2015 of 375,000 and 411,000, respectively, and for the nine months ended September 30, 2016 and 2015 of 394,000 and 412,000, respectively; and

• weighted average options for the three months ended September 30, 2016 and 2015 of 233,000 and 440,000, respectively, and for the nine months ended September 30, 2016 and 2015 of 307,000 and 480,000, respectively.

We had outstanding senior notes, which we redeemed in April 2015, 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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Numerator:
(Loss) income from continuing operations	$	(4,829	)	$	94,279		$	(45,049	)	$	122,105
Gain on sales of real estate, net	34,101			15			34,101			4,000
Preferred unit distributions	(3,717		)	(3,717		)	(11,152		)	(11,152		)
Income from continuing operations attributable to noncontrolling interests	(913		)	(972		)	(2,803		)	(2,605		)
Income from continuing operations attributable to share-based compensation awards	(105		)	(369		)	(319		)	(475		)
Numerator for basic EPU from continuing operations attributable to COPLP common unitholders	24,537			89,236			(25,222		)	111,873
Convertible preferred units	—			372			—			—
Numerator for diluted EPU from continuing operations attributable to COPLP common unitholders	$	24,537		$	89,608		$	(25,222	)	$	111,873
Numerator for basic EPU from continuing operations attributable to COPLP common unitholders	$	24,537		$	89,236		$	(25,222	)	$	111,873
Discontinued operations	—			—			—			156
Discontinued operations attributable to noncontrolling interests	—			—			—			3
Numerator for basic EPU on net income attributable to COPLP common unitholders	24,537			89,236			(25,222		)	112,032
Convertible preferred units	—			372			—			—
Numerator for diluted EPU on net income attributable to COPLP common unitholders	$	24,537		$	89,608		$	(25,222	)	$	112,032
Denominator (all weighted averages):
Denominator for basic EPU (common units)	98,024			97,832			97,960			97,527
Convertible preferred shares	—			434			—			—
Dilutive effect of share-based compensation awards	81			21			—			82
Denominator for diluted EPU (common units)	98,105			98,287			97,960			97,609
Basic EPU:
(Loss) income from continuing operations attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPLP common unitholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Diluted EPU:
(Loss) income from continuing operations attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPLP common unitholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15

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 Three Months Ended September 30,		For the Nine Months Ended September 30,
	2016	2015	2016	2015
Conversion of Series I preferred units	176	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 effects were antidilutive:

• weighted average restricted units and deferred share awards for the three months ended September 30, 2016 and 2015 of 375,000 and 411,000, respectively, and for the nine months ended September 30, 2016 and 2015 of 394,000 and 412,000, respectively; and

• weighted average options for the three months ended September 30, 2016 and 2015 of 233,000 and 440,000, respectively, and for the nine months ended September 30, 2016 and 2015 of 307,000 and 480,000, respectively.

We had outstanding senior notes, which we redeemed in April 2015, 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

9 Months Ended

Sep. 30, 2016

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 $1.3 million liability through September 30, 2016 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 September 30, 2016 follow (in thousands):

Year Ending December 31,
2016 (1)	$	307
2017	1,159
2018	1,113
2019	1,082
2020	1,089
Thereafter	86,806
	$	91,556

(1) Represents the three months ending December 31, 2016.

Contractual Obligations

We had amounts remaining to be incurred under various contractual obligations as of September 30, 2016 that included the following:

• new development and redevelopment obligations of $77.6 million;

• capital expenditures for operating properties of $60.5 million;

• third party construction and development of $10.5 million; and

• purchase obligations of $1.8 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 limited to $19 million in the aggregate. We have insurance coverage in place to mitigate much of any potential future losses that may result from these indemnification agreements.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2016

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.

These interim financial statements should be read together with the consolidated financial statements and notes thereto as of and for the year ended December 31, 2015 included in our 2015 Annual Report on Form 10-K.  The unaudited consolidated financial statements include all adjustments that are necessary, in the opinion of management, to fairly state our financial position and results of operations.  All adjustments are of a normal recurring nature.  The consolidated financial statements have been prepared using the accounting policies described in our 2015 Annual Report on Form 10-K.

Recent Accounting Pronouncement

Recent Accounting Pronouncements

We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) effective January 1, 2016 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. Our adoption of this guidance did not affect on our reported consolidated financial statements.

We adopted guidance issued by the FASB effective January 1, 2016 modifying the analysis that must be performed by us in determining whether we should consolidate certain types of legal entities. The guidance did not amend the existing disclosure requirements for VIEs or voting interest model entities.  The guidance, however, modified the requirements to qualify under the voting interest model. Under the revised guidance, COPLP is considered a variable interest entity of COPT. As COPLP was already consolidated in the balance sheets of COPT, the identification of COPLP as a variable interest entity had no impact on the consolidated financial statements.  There were no other legal entities qualifying under the scope of the revised guidance that were consolidated as a result of the adoption.  In addition, there were no voting interest entities under prior existing guidance determined to be variable interest entities under the revised guidance.  

We adopted effective January 1, 2016 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. Our adoption of this guidance did not affect our reported consolidated financial statements.

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 February 2016, the FASB issued guidance that sets forth principles for the recognition, measurement, presentation and disclosure of leases.  This guidance requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the principle of whether or not the lease is effectively a financed purchase of the leased asset by the lessee. The resulting classification determines whether the lease expense is recognized based on an effective interest method or straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating leases. The guidance requires lessors to account for leases using an approach that is substantially equivalent to existing guidance for sales-type leases, direct financing leases and operating leases.  This guidance is effective for reporting periods beginning after December 15, 2018, with early adoption permitted. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In March 2016, the FASB issued guidance intended to simplify certain aspects of the accounting for employee based share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification on the consolidated statement of cash flows. This guidance is effective for annual periods beginning after December 15, 2016, and interim periods within those annual periods, with early adoption permitted. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In June 2016, the FASB issued guidance that changes how entities measure credit losses for most financial assets and certain other instruments that are not measured at fair value through net income. The guidance replaces the current incurred loss model with an expected loss approach, resulting in a more timely recognition of such losses. The guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted after December 2018. We are currently assessing the financial impact of this guidance on our consolidated financial statements.

In August 2016, the FASB issued guidance that clarifies how entities should classify certain cash receipts and cash payments on the statement of cash flows with the objective of reducing the existing diversity in practice related to eight specific cash flow issues. The guidance is effective for annual periods beginning after December 15, 2017, and interim periods within those fiscal years. Early adoption is permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2016

Fair Value Disclosures [Abstract]

Schedule of fair value assets and liabilities measured on recurring basis

The table below sets forth financial assets and liabilities of COPLP and its subsidiaries that are accounted for at fair value on a recurring basis as of September 30, 2016 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
Liabilities:
Interest rate derivatives	$	—	$	17,272	$	—	$	17,272

The table below sets forth financial assets and liabilities of COPT and its subsidiaries that are accounted for at fair value on a recurring basis as of September 30, 2016 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
Assets:
Marketable securities in deferred compensation plan (1)
Mutual funds	$	5,160	$	—	$	—	$	5,160
Other	90		—		—		90
Total assets	$	5,250	$	—	$	—	$	5,250
Liabilities:
Deferred compensation plan liability (2)	$	—	$	5,250	$	—	$	5,250
Interest rate derivatives	—		17,272		—		17,272
Total liabilities	$	—	$	22,522	$	—	$	22,522

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

(2) Included in the line entitled “other liabilities” on COPT’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 value measurements of these assets as of September 30, 2016 (dollars in thousands):

	Fair Values as of September 30, 2016
	Quoted Prices in				Significant
	Active Markets for		Significant Other		Unobservable
	Identical Assets		Observable Inputs		Inputs
Description	(Level 1)		(Level 2)		(Level 3)		Total
Assets:
Assets held for sale, net	$	—	$	—	$	127,128	$	127,128

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 September 30, 2016 (dollars in thousands):

Valuation Technique	Fair Values on  Measurement Date		Unobservable Input	Range (Weighted Average)
Contracts to sell	$	87,983	Contract amounts	N/A
Discounted cash flow	$	36,693	Discount rate	9.5% - 11.3% (10.5%)
			Terminal capitalization rate	8.3% - 9.5% (8.7%)
Yield analyses	$	2,452	Investor yield requirement	9.0% (1)

(1) Only one fair value applied for this unobservable input.

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Properties, Net (Tables)

9 Months Ended

Sep. 30, 2016

Real Estate [Abstract]

Schedule of operating properties, net

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

	September 30, 2016			December 31, 2015
Land	$	424,627		$	463,305
Buildings and improvements	2,888,918			3,157,587
Less: Accumulated depreciation	(681,476		)	(700,363		)
Operating properties, net	$	2,632,069		$	2,920,529

Schedule of projects in development or held for future development

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

	September 30, 2016		December 31, 2015
Land	$	199,038	$	207,774
Development in progress, excluding land	197,231		221,445
Projects in development or held for future development	$	396,269	$	429,219

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):

	September 30, 2016		December 31, 2015
Properties, net	$	147,236	$	90,188
Deferred rent receivable	6,642		2,891
Intangible assets on real estate acquisitions, net	1,540		1,591
Deferred leasing costs, net	4,901		1,391
Lease incentives, net	1,135		721
Assets held for sale, net	$	161,454	$	96,782

Pro Forma results

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 share amounts).

	For the Three Months Ended September 30, 2015		For the Nine Months Ended September 30, 2015
	(Unaudited)
Pro forma total revenues	$	152,736	$	498,657
Pro forma net income attributable to COPT common shareholders	$	88,836	$	112,941
Pro forma EPS:
Basic	$	0.94	$	1.20
Diluted	$	0.94	$	1.20

Schedule of operating property dispositions

During the nine months ended September 30, 2016, 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		Gain on Disposition
Arborcrest Corporate Campus (1)	Philadelphia, PA	Regional Office	8/4/2016	4	654,000	$	142,800	$	4,742
8003 Corporate Drive	White Marsh, MD	Regional Office	8/17/2016	1	18,000	2,400		—
1341 & 1343 Ashton Road	Hanover, MD	Fort Meade/BW Corridor	9/9/2016	2	25,000	2,900		848
8007, 8013, 8015, 8019 and 8023-8027 Corporate Drive (1)	White Marsh, MD	Regional Office	9/21/2016	5	130,000	14,513		1,906
1302, 1304 and 1306 Concourse Drive	Linthicum, MD	Fort Meade/BW Corridor	9/29/2016	3	299,000	48,100		8,683
				15	1,126,000	$	210,713	$	16,179

(1) This disposition also included land.

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Real Estate Joint Ventures (Tables)

9 Months Ended

Sep. 30, 2016

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 September 30, 2016 (dollars in thousands):

		Nominal
		Ownership		September 30, 2016				(1)
	Date	% as of		Total		Encumbered		Total
	Acquired	9/30/2016	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	157,168	$	80,154	$	53,056
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	66,053		47,006		45,807
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	40,282		—		7,680
				$	263,503	$	127,160	$	106,543

(1) Excludes amounts eliminated in consolidation.

(2) This joint venture’s properties are 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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Investing Receivables (Tables)

9 Months Ended

Sep. 30, 2016

Receivables [Abstract]

Schedule of investing receivables

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

	September 30, 2016		December 31, 2015
Notes receivable from the City of Huntsville	$	48,098	$	44,875
Other investing loans receivable	3,021		3,000
	$	51,119	$	47,875

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Prepaid Expenses and Other Assets, Net (Tables)

9 Months Ended

Sep. 30, 2016

Prepaid Expense and Other Assets [Abstract]

Schedule of prepaid expenses and other assets

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

	September 30, 2016		December 31, 2015
Prepaid expenses	$	28,752	$	23,009
Lease incentives, net	19,106		11,133
Construction contract costs incurred in excess of billings	6,367		3,261
Furniture, fixtures and equipment, net	5,492		6,004
Deferred financing costs, net (1)	3,812		5,867
Deferred tax asset, net (2)	3,282		3,467
Other assets	6,727		7,283
Prepaid expenses and other assets, net	$	73,538	$	60,024

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

(2) Includes a valuation allowance of $2.1 million.

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Debt, Net (Tables)

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Schedule of debt

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

	Carrying Value (1) as of					Scheduled Maturity
	September 30, 2016		December 31, 2015		Stated Interest Rates as of	as of
					September 30, 2016	September 30, 2016
Mortgage and Other Secured Loans:
Fixed rate mortgage loans (2)	$	154,976	$	281,208	3.82% - 7.87% (3)	2019-2026
Variable rate secured loans	13,529		49,792		LIBOR + 1.85% (4)	October 2020
Total mortgage and other secured loans	168,505		331,000
Revolving Credit Facility	—		43,500		LIBOR + 0.875% to 1.60%	May 2019
Term Loan Facilities (5)	516,812		515,902		LIBOR + 0.90% to 2.60% (6)	2019-2022
Unsecured Senior Notes
3.600%, $350,000 aggregate principal	347,024		346,714		3.60% (7)	May 2023
5.250%, $250,000 aggregate principal	246,063		245,731		5.25% (8)	February 2024
3.700%, $300,000 aggregate principal	297,725		297,378		3.70% (9)	June 2021
5.000%, $300,000 aggregate principal	296,279		296,019		5.00% (10)	July 2025
Unsecured notes payable	1,428		1,508		0% (11)	2026
Total debt, net	$	1,873,836	$	2,077,752

(1) The carrying values of our loans other than the Revolving Credit Facility reflect net deferred financing costs of $6.9 million as of September 30, 2016 and $8.0 million as of December 31, 2015.

(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 $440,000 as of September 30, 2016 and $514,000 as of December 31, 2015.

(3) The weighted average interest rate on our fixed rate mortgage loans was 4.20% as of September 30, 2016.

(4)  The interest rate on our variable rate secured loan as of September 30, 2016 was 2.37%.

(5)   As of September 30, 2016, we had an additional $150 million in borrowings available to be drawn under a term loan. In addition, we had 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. On October 12, 2016, we repaid a $120.0 million term loan that was scheduled to mature in August 2019.

(6)  The weighted average interest rate on these loans was 2.17% as of September 30, 2016.

(7) The carrying value of these notes reflects an unamortized discount totaling $2.0 millionas of September 30, 2016 and $2.2 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%. 

(8) The carrying value of these notes reflectsan unamortized discount totaling $3.5 millionas of September 30, 2016 and $3.8 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%. 

(9) The carrying value of these notes reflects an unamortized discount totaling $1.8 millionas of September 30, 2016 and $2.1 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.85%. 

(10) The carrying value of these notes reflects an unamortized discount totaling $3.1 millionas of September 30, 2016 and $3.3 million as of December 31, 2015.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

(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 $483,000 as of September 30, 2016 and $554,000 as of December 31, 2015.

Schedule of the fair value of debt

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

	September 30, 2016				December 31, 2015
	Carrying		Estimated		Carrying		Estimated
	Amount		Fair Value		Amount		Fair Value
Fixed-rate debt
Unsecured Senior Notes	$	1,187,091	$	1,233,860	$	1,185,842	$	1,211,658
Other fixed-rate debt	156,404		162,974		282,716		291,991
Variable-rate debt	530,341		533,079		609,194		610,987
	$	1,873,836	$	1,929,913	$	2,077,752	$	2,114,636

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Interest Rate Derivatives (Tables)

9 Months Ended

Sep. 30, 2016

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 Amount			Fixed Rate	Floating Rate Index	Effective Date	Expiration Date	September 30, 2016			December 31, 2015
$	100,000		1.6730%	One-Month LIBOR	9/1/2015	8/1/2019	$	(2,339	)	$	(1,217	)
100,000			1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	(2,500		)	(1,429		)
13,676		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	(236		)	53
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	(4,879		)	(138		)
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	(4,872		)	(45		)
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	(2,446		)	(32		)
100,000			0.8055%	One-Month LIBOR	9/2/2014	9/1/2016	—			(148		)
100,000			0.8100%	One-Month LIBOR	9/2/2014	9/1/2016	—			(151		)
							$	(17,272	)	$	(3,107	)

(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
Derivatives	Balance Sheet Location	September 30, 2016			December 31, 2015
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets	$	—		$	53
Interest rate swaps designated as cash flow hedges	Interest rate derivatives	(17,272		)	(3,160		)

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 Three Months Ended September 30,					For the Nine Months Ended September 30,
	2016		2015			2016			2015
Amount of gain (loss) recognized in accumulated other comprehensive loss (“AOCL”) (effective portion)	$	407	$	(3,638	)	$	(16,581	)	$	(6,720	)
Amount of losses reclassified from AOCL into interest expense (effective portion)	1,043		915			2,763			2,457
Amount of gain (loss) recognized in interest expense (ineffective portion)	1,523		—			(347		)	—

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Redeemable Noncontrolling Interests (Tables)

9 Months Ended

Sep. 30, 2016

Noncontrolling Interest [Abstract]

Schedule of activity for redeemable noncontrolling interest

The table below sets forth the activity for these redeemable noncontrolling interests (in thousands):

	For the Nine Months Ended September 30,
	2016			2015
Beginning balance	$	19,218		$	18,417
Contributions from noncontrolling interests	22,779			—
Distributions to noncontrolling interests	(21,344		)	(1,098		)
Net income attributable to noncontrolling interests	1,679			1,690
Adjustment to arrive at fair value of interests	516			599
Ending balance	$	22,848		$	19,608

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Information by Business Segment (Tables)

9 Months Ended

Sep. 30, 2016

Segment Reporting [Abstract]

Schedule of segment financial information for 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		Data Center Shells		Total Defense/IT Locations		Regional Office			Operating Wholesale Data Center			Other			Total
Three Months Ended September 30, 2016
Revenues from real estate operations	$	61,460	$	12,231		$	12,532	$	7,232	$	3,189	$	5,175	$	101,819	$	20,499		$	6,809		$	1,827		$	130,954
Property operating expenses	20,598		4,462			7,599		3,374		1,112		528		37,673		8,155			3,317			807			49,952
UJV NOI allocable to COPT	—		—			—		—		—		1,008		1,008		—			—			—			1,008
NOI from real estate operations	$	40,862	$	7,769		$	4,933	$	3,858	$	2,077	$	5,655	$	65,154	$	12,344		$	3,492		$	1,020		$	82,010
Additions to long-lived assets	$	5,901	$	7,153		$	—	$	2,207	$	2,642	$	—	$	17,903	$	4,168		$	108		$	53		$	22,232
Transfers from non-operating properties	$	5,331	$	308		$	3	$	—	$	3,100	$	25,513	$	34,255	$	(4	)	$	40		$	—		$	34,291
Three Months Ended September 30, 2015
Revenues from real estate operations	$	61,400	$	12,875		$	9,018	$	6,886	$	3,061	$	5,665	$	98,905	$	26,782		$	6,078		$	1,921		$	133,686
Property operating expenses	20,106		5,150			4,553		3,287		888		532		34,516		9,596			4,008			777			48,897
UJV NOI allocable to COPT	—		—			—		—		—		—		—		—			—			—			—
NOI from real estate operations	$	41,294	$	7,725		$	4,465	$	3,599	$	2,173	$	5,133	$	64,389	$	17,186		$	2,070		$	1,144		$	84,789
Additions to long-lived assets	$	7,943	$	1,603		$	—	$	2,084	$	175	$	—	$	11,805	$	129,259		$	—		$	(27	)	$	141,037
Transfers from non-operating properties	$	25,184	$	(91	)	$	591	$	1,408	$	1,207	$	34,287	$	62,586	$	5,505		$	73,804		$	315		$	142,210
Nine Months Ended September 30, 2016
Revenues from real estate operations	$	184,881	$	36,404		$	34,408	$	21,164	$	9,496	$	18,793	$	305,146	$	67,284		$	20,106		$	5,429		$	397,965
Property operating expenses	64,222		13,310			19,863		9,573		3,050		2,164		112,182		26,707			8,629			2,450			149,968
UJV NOI allocable to COPT	—		—			—		—		—		1,008		1,008		—			—			—			1,008
NOI from real estate operations	$	120,659	$	23,094		$	14,545	$	11,591	$	6,446	$	17,637	$	193,972	$	40,577		$	11,477		$	2,979		$	249,005
Additions to long-lived assets	$	19,516	$	13,290		$	—	$	5,710	$	3,561	$	—	$	42,077	$	9,107		$	108		$	363		$	51,655
Transfers from non-operating properties	$	41,850	$	28,158		$	240	$	—	$	3,315	$	81,467	$	155,030	$	104		$	(391	)	$	(11	)	$	154,732
Segment assets at September 30, 2016	$	1,261,337	$	416,886		$	132,722	$	195,244	$	111,310	$	189,746	$	2,307,245	$	453,766		$	234,551		$	31,563		$	3,027,125
Nine Months Ended September 30, 2015
Revenues from real estate operations	$	182,591	$	37,383		$	27,426	$	21,337	$	8,165	$	15,816	$	292,718	$	73,142		$	12,933		$	5,798		$	384,591
Property operating expenses	63,102		16,120			14,665		10,075		2,605		1,726		108,293		26,750			8,441			2,506			145,990
UJV NOI allocable to COPT	—		—			—		—		—		—		—		—			—			—			—
NOI from real estate operations	$	119,489	$	21,263		$	12,761	$	11,262	$	5,560	$	14,090	$	184,425	$	46,392		$	4,492		$	3,292		$	238,601
Additions to long-lived assets	$	16,529	$	86,303		$	—	$	5,446	$	466	$	—	$	108,744	$	198,589		$	108		$	282		$	307,723
Transfers from non-operating properties	$	44,212	$	51,117		$	32,150	$	1,408	$	13,184	$	50,295	$	192,366	$	22,230		$	89,183		$	327		$	304,106
Segment assets at September 30, 2015	$	1,284,712	$	413,321		$	134,790	$	196,105	$	108,541	$	203,090	$	2,340,559	$	695,490		$	246,806		$	71,907		$	3,354,762

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 Three Months Ended September 30,				For the Nine Months Ended September 30,
	2016		2015		2016		2015
Segment revenues from real estate operations	$	130,954	$	133,686	$	397,965	$	384,591
Construction contract and other service revenues	11,149		17,058		34,372		97,554
Less: Revenues from discontinued operations	—		—		—		(4		)
Total revenues	$	142,103	$	150,744	$	432,337	$	482,141

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 Three Months Ended September 30,				For the Nine Months Ended September 30,
	2016		2015		2016		2015
Segment property operating expenses	$	49,952	$	48,897	$	149,968	$	145,990
Less: Property operating expenses from discontinued operations	—		—		—		6
Total property operating expenses	$	49,952	$	48,897	$	149,968	$	145,996

Schedule of reconciliation of unconsolidated joint venture net operating income to equity in income of unconsolidated entities

The following table reconciles UJV NOI allocable to COPT to equity in income of unconsolidated entities as reported on our consolidated statements of operations (in thousands):

	For the Three Months Ended September 30,					For the Nine Months Ended September 30,
	2016			2015		2016			2015
UJV NOI allocable to COPT	$	1,008		$	—	$	1,008		$	—
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(415		)	—		(415		)	—
Add: Equity in income of unconsolidated non-real estate entities	1			18		21			52
Equity in income of unconsolidated entities	$	594		$	18	$	614		$	52

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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Construction contract and other service revenues	$	11,149		$	17,058		$	34,372		$	97,554
Construction contract and other service expenses	(10,341		)	(16,132		)	(32,513		)	(94,923		)
NOI from service operations	$	808		$	926		$	1,859		$	2,631

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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
NOI from real estate operations	$	82,010		$	84,789		$	249,005		$	238,601
NOI from service operations	808			926			1,859			2,631
Interest and other income	1,391			692			3,877			3,217
Equity in income of unconsolidated entities	594			18			614			52
Income tax (expense) benefit	21			(48		)	28			(153		)
Depreciation and other amortization associated with real estate operations	(32,015		)	(38,403		)	(99,790		)	(103,788		)
Impairment losses	(27,699		)	(2,307		)	(99,837		)	(3,545		)
General, administrative and leasing expenses	(8,855		)	(7,439		)	(28,764		)	(22,864		)
Business development expenses and land carry costs	(1,716		)	(5,573		)	(6,497		)	(10,986		)
Interest expense	(18,301		)	(24,121		)	(64,499		)	(66,727		)
NOI from discontinued operations	—			—			—			(10		)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,008		)	—			(1,008		)	—
(Loss) gain on early extinguishment of debt	(59		)	85,745			(37		)	85,677
(Loss) income from continuing operations	$	(4,829	)	$	94,279		$	(45,049	)	$	122,105

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):

	September 30, 2016		September 30, 2015
Segment assets	$	3,027,125	$	3,354,762
Non-operating property assets	421,364		416,540
Other assets	185,705		140,790
Total COPT consolidated assets	$	3,634,194	$	3,912,092

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Share-Based Compensation and Other Compensation Matters (Tables)

9 Months Ended

Sep. 30, 2016

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

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

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Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Tables)

9 Months Ended

Sep. 30, 2016

Earnings Per Share [Line Items]

Summary of calculation of numerator and denominator in basic and diluted earnings 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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Numerator:
(Loss) income from continuing operations	$	(4,829	)	$	94,279		$	(45,049	)	$	122,105
Gain on sales of real estate, net	34,101			15			34,101			4,000
Preferred share dividends	(3,552		)	(3,552		)	(10,657		)	(10,657		)
Income from continuing operations attributable to noncontrolling interests	(1,973		)	(4,494		)	(2,346		)	(7,322		)
Income from continuing operations attributable to share-based compensation awards	(105		)	(369		)	(319		)	(475		)
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	23,642			85,879			(24,270		)	107,651
Convertible preferred shares	—			372			—			—
Dilutive effect of common units in COPLP on diluted EPS from continuing operations	—			—			—			4,225
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders	$	23,642		$	86,251		$	(24,270	)	$	111,876
Numerator for basic EPS from continuing operations attributable to COPT common shareholders	$	23,642		$	85,879		$	(24,270	)	$	107,651
Discontinued operations	—			—			—			156
Discontinued operations attributable to noncontrolling interests	—			—			—			(3		)
Numerator for basic EPS on net income attributable to COPT common shareholders	23,642			85,879			(24,270		)	107,804
Convertible preferred shares	—			372			—			—
Dilutive effect of common units in COPLP	—			—			—			4,231
Numerator for diluted EPS on net income attributable to COPT common shareholders	$	23,642		$	86,251		$	(24,270	)	$	112,035
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	94,433			94,153			94,312			93,830
Convertible preferred shares	—			434			—			—
Dilutive effect of common units	—			—			—			3,697
Dilutive effect of share-based compensation awards	81			21			—			82
Denominator for diluted EPS (common shares)	94,514			94,608			94,312			97,609
Basic EPS:
(Loss) income from continuing operations attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPT common shareholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Diluted EPS:
(Loss) income from continuing operations attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPT common shareholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPT common shareholders	$	0.25		$	0.91		$	(0.26	)	$	1.15

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 Three Months Ended September 30,		For the Nine Months Ended September 30,
	2016	2015	2016	2015
Conversion of common units	3,591	3,679	3,648	—
Conversion of Series I Preferred Units	176	176	176	176
Conversion of Series K Preferred Shares	434	—	434	434

Corporate Office Properties, L.P.

Earnings Per Share [Line Items]

Summary of calculation of numerator and denominator in basic and diluted earnings 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 Three Months Ended September 30,						For the Nine Months Ended September 30,
	2016			2015			2016			2015
Numerator:
(Loss) income from continuing operations	$	(4,829	)	$	94,279		$	(45,049	)	$	122,105
Gain on sales of real estate, net	34,101			15			34,101			4,000
Preferred unit distributions	(3,717		)	(3,717		)	(11,152		)	(11,152		)
Income from continuing operations attributable to noncontrolling interests	(913		)	(972		)	(2,803		)	(2,605		)
Income from continuing operations attributable to share-based compensation awards	(105		)	(369		)	(319		)	(475		)
Numerator for basic EPU from continuing operations attributable to COPLP common unitholders	24,537			89,236			(25,222		)	111,873
Convertible preferred units	—			372			—			—
Numerator for diluted EPU from continuing operations attributable to COPLP common unitholders	$	24,537		$	89,608		$	(25,222	)	$	111,873
Numerator for basic EPU from continuing operations attributable to COPLP common unitholders	$	24,537		$	89,236		$	(25,222	)	$	111,873
Discontinued operations	—			—			—			156
Discontinued operations attributable to noncontrolling interests	—			—			—			3
Numerator for basic EPU on net income attributable to COPLP common unitholders	24,537			89,236			(25,222		)	112,032
Convertible preferred units	—			372			—			—
Numerator for diluted EPU on net income attributable to COPLP common unitholders	$	24,537		$	89,608		$	(25,222	)	$	112,032
Denominator (all weighted averages):
Denominator for basic EPU (common units)	98,024			97,832			97,960			97,527
Convertible preferred shares	—			434			—			—
Dilutive effect of share-based compensation awards	81			21			—			82
Denominator for diluted EPU (common units)	98,105			98,287			97,960			97,609
Basic EPU:
(Loss) income from continuing operations attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPLP common unitholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Diluted EPU:
(Loss) income from continuing operations attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15
Discontinued operations attributable to COPLP common unitholders	0.00			0.00			0.00			0.00
Net (loss) income attributable to COPLP common unitholders	$	0.25		$	0.91		$	(0.26	)	$	1.15

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 Three Months Ended September 30,		For the Nine Months Ended September 30,
	2016	2015	2016	2015
Conversion of Series I preferred units	176	176	176	176
Conversion of Series K preferred units	434	—	434	434

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2016

Commitments and Contingencies Disclosure [Abstract]

Future minimum rental payments for operating leases

Future minimum rental payments due under the terms of these operating leases as of September 30, 2016 follow (in thousands):

Year Ending December 31,
2016 (1)	$	307
2017	1,159
2018	1,113
2019	1,082
2020	1,089
Thereafter	86,806
	$	91,556

(1) Represents the three months ending December 31, 2016.

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Organization (Details) ft² in Thousands	Sep. 30, 2016 a ft² Property MW
Properties under or approved for redevelopment
Investments in real estate
Number of real estate properties	3
Area of real estate property (in square feet or acres) | ft²	104
Operating office properties
Investments in real estate
Number of real estate properties	168
Area of real estate property (in square feet or acres) | ft²	17,500
Operating office properties | Single-tenant data centers
Investments in real estate
Number of real estate properties	12
Operating office properties | Single-tenant data centers | Unconsolidated Joint Venture
Investments in real estate
Number of real estate properties	6
Office properties under, or contractually committed for, construction or approved for redevelopment
Investments in real estate
Number of real estate properties	10
Area of real estate property (in square feet or acres) | ft²	1,200
Office properties under, or contractually committed for, construction or approved for redevelopment | Properties completed Held-for-future lease
Investments in real estate
Number of real estate properties	2
Partially operational properties | Properties under or approved for redevelopment
Investments in real estate
Number of real estate properties	2
Land controlled for future development
Investments in real estate
Area of real estate property (in square feet or acres) | a	1,358
Developable square feet | ft²	16,200
Operating wholesale data centers
Investments in real estate
Critical load (in megawatts) | MW	19.25

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Organization (Details 2) - Corporate Office Properties, L.P.	9 Months Ended
	Sep. 30, 2016
Common Units
Forms of ownership in Operating Partnership and ownership percentage by the entity
Percentage ownership in operating partnership	96.30%
Preferred Units
Forms of ownership in Operating Partnership and ownership percentage by the entity
Percentage ownership in operating partnership	95.50%

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Fair Value Measurements (Details) - Deferred compensation plan - Management $ in Millions	9 Months Ended
	Sep. 30, 2016 USD ($)
Assets and liabilities measured at fair value on a recurring basis
Maximum percentage of participants' compensation which is deferrable (as a percent)	100.00%
Balance of the plan which was fully funded	$ 5.3

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Fair Value Measurements (Details 2) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Liabilities:
Interest rate derivatives	$ 17,272	$ 3,160
Corporate Office Properties, L.P.
Liabilities:
Interest rate derivatives	17,272	$ 3,160
Fair value measurement on a recurring basis
Assets:
Fair Values on Measurement Date	5,250
Liabilities:
Deferred compensation plan liability	5,250
Interest rate derivatives	17,272
Liabilities	22,522
Fair value measurement on a recurring basis | Mutual funds
Assets:
Marketable securities in deferred compensation plan	5,160
Fair value measurement on a recurring basis | Other
Assets:
Marketable securities in deferred compensation plan	90
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Fair Values on Measurement Date	5,250
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds
Assets:
Marketable securities in deferred compensation plan	5,160
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Assets:
Marketable securities in deferred compensation plan	90
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2)
Liabilities:
Deferred compensation plan liability	5,250
Interest rate derivatives	17,272
Liabilities	22,522
Fair value measurement on a recurring basis | Corporate Office Properties, L.P.
Liabilities:
Interest rate derivatives	17,272
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2)
Liabilities:
Interest rate derivatives	$ 17,272

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Fair Value Measurements (Details 3) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($) Property	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Assets and liabilities measured at fair value on a non-recurring basis
Impairment losses	$ 27,699			$ 2,307	$ 99,837	$ 3,545
Assets held for sale, net	161,454				161,454		$ 96,782
Assets held for sale, net
Assets and liabilities measured at fair value on a non-recurring basis
Assets held for sale, net	161,454				161,454		96,782
Fort Meade/BW Corridor
Assets and liabilities measured at fair value on a non-recurring basis
Number of properties | Property			2
Fair value measurement on a nonrecurring basis | Assets held for sale, net
Assets and liabilities measured at fair value on a non-recurring basis
Properties held-for-sale							$ 96,800
Impairment losses	11,500		$ 2,400
Assets held for sale, net	161,454	$ 300,600	$ 225,900		161,454
Fair Values on Measurement Date	127,128				127,128
Fair value measurement on a nonrecurring basis | Assets held for sale, net | Significant Unobservable Inputs (Level 3)
Assets and liabilities measured at fair value on a non-recurring basis
Fair Values on Measurement Date	127,128				$ 127,128
Fair value measurement on a nonrecurring basis | Assets disposed of by sale
Assets and liabilities measured at fair value on a non-recurring basis
Transaction Value	210,700
Fair value measurement on a nonrecurring basis | Northern Virginia Defense/IT and Fort Meade/BW Corridor | Assets held for sale, net
Assets and liabilities measured at fair value on a non-recurring basis
Impairment losses		14,100
Fair value measurement on a nonrecurring basis | Defense/Information Technology Locations | Fort Meade/BW Corridor | Assets held for sale, net
Assets and liabilities measured at fair value on a non-recurring basis
Impairment losses	13,300
Fair value measurement on a nonrecurring basis | Aberdeen, Maryland | Land in development or held for future development
Assets and liabilities measured at fair value on a non-recurring basis
Impairment losses		4,400
Fair value measurement on a nonrecurring basis | Aberdeen, Maryland | Other Segments | Operating properties, net
Assets and liabilities measured at fair value on a non-recurring basis
Impairment losses		34,400
Fair value measurement on a nonrecurring basis | Frederick, Maryland | Land in development or held for future development
Assets and liabilities measured at fair value on a non-recurring basis
Impairment losses		8,200
Fair value measurement on a nonrecurring basis | Greater Philadelphia, Pennsylvania | Regional Office | Assets held for sale, net
Assets and liabilities measured at fair value on a non-recurring basis
Impairment losses		$ 6,200
Fair value measurement on a nonrecurring basis | White Marsh, Maryland | Assets held for sale, net
Assets and liabilities measured at fair value on a non-recurring basis
Impairment losses	10,000
Fair value measurement on a nonrecurring basis | White Marsh, Maryland | Assets held for sale, net | Land in development or held for future development
Assets and liabilities measured at fair value on a non-recurring basis
Impairment losses	$ 2,900

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Fair Value Measurements (Details 4) - Fair value measurement on a nonrecurring basis - Significant Unobservable Inputs (Level 3) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Contracts to sell
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values on Measurement Date	$ 87,983
Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values on Measurement Date	36,693
Yield analyses
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Fair Values on Measurement Date	$ 2,452
Investor yield requirement (percent)	9.00%
Minimum | Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate (percent)	9.50%
Terminal capitalization rate (percent)	8.30%
Maximum | Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate (percent)	11.30%
Terminal capitalization rate (percent)	9.50%
Weighted Average | Discounted cash flow
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]
Discount rate (percent)	10.50%
Terminal capitalization rate (percent)	8.70%

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Properties, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Investments in real estate
Less: accumulated depreciation	$ (681,476)	$ (700,363)
Operating properties, net	2,632,069	2,920,529
Land
Investments in real estate
Gross	424,627	463,305
Buildings and improvements
Investments in real estate
Gross	$ 2,888,918	$ 3,157,587

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Properties, Net (Details 2) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Properties
Projects in development or held for future development	$ 396,269	$ 429,219
Projects in development or held for future development | Land in development or held for future development
Properties
Projects in development or held for future development	199,038	207,774
Projects in development or held for future development | Construction in progress, excluding land
Properties
Projects in development or held for future development	$ 197,231	$ 221,445

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Properties, Net (Details 3) $ in Thousands	Sep. 30, 2016 USD ($) Property	Dec. 31, 2015 USD ($) Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale, net	$ 161,454	$ 96,782
Assets held for sale, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Properties, net	147,236	90,188
Deferred rent receivable	6,642	2,891
Intangible assets on real estate acquisitions, net	1,540	1,591
Deferred leasing costs, net	4,901	1,391
Lease incentives, net	1,135	721
Assets held for sale, net	$ 161,454	$ 96,782
Fort Meade/BW Corridor | Assets held for sale, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | Property	6
Regional Office | White Marsh, Maryland | Assets held for sale, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | Property	9	13
Other Segments | San Antonio, Texas | Assets held for sale, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | Property	2	2
Defense/Information Technology Locations | Northern Virginia Defense/IT | Assets held for sale, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of properties | Property	2

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Properties, Net (Details 4) ft² in Thousands, $ in Thousands				3 Months Ended		9 Months Ended
	Aug. 07, 2015 USD ($) ft²	Apr. 15, 2015 USD ($) ft²	Mar. 19, 2015 USD ($) ft²	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
2015 Acquisitions
Business Acquisition [Line Items]
Contributed revenues				$ 9,200	$ 6,900	$ 27,600	$ 11,200
Contributed net income from continuing operations				$ 432	$ 487	$ 2,400	$ 697
250 W Pratt St | Baltimore, Maryland
Business Acquisition [Line Items]
Square footage of real estate properties (in square feet) | ft²			367
Acquired property percentage leased			96.20%
Total acquisition cost			$ 61,800
2600 Park Tower Drive | Northern Virginia
Business Acquisition [Line Items]
Square footage of real estate properties (in square feet) | ft²		237
Acquired property percentage leased		100.00%
Total acquisition cost		$ 80,500
100 and 30 Light Street | Baltimore, Maryland
Business Acquisition [Line Items]
Square footage of real estate properties (in square feet) | ft²	558
Acquired property percentage leased	93.50%
Total acquisition cost	$ 121,200
Business combination, liabilities assumed	55,000
Fair value assumption of debt	$ 55,500

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Properties, Net (Details 5) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Real Estate [Abstract]
Pro forma total revenues	$ 152,736	$ 498,657
Pro forma net income attributable to COPT common shareholders	$ 88,836	$ 112,941
Pro Forma EPS, Basic (in dollars per share)	$ 0.94	$ 1.20
Pro Forma EPS, Diluted (in dollars per share)	$ 0.94	$ 1.20

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Properties, Net (Details 6) ft² in Thousands, $ in Thousands		9 Months Ended
	Jul. 21, 2016 USD ($) Property	Sep. 30, 2016 USD ($) ft² buillding Property	Sep. 30, 2015 USD ($)
Construction and Redevelopment Activities
Value of properties contributed		$ 22,600	$ 0
Sale price of land		$ 5,700
Operating office properties
Construction and Redevelopment Activities
Square footage of real estate properties (in square feet) | ft²		17,500
Number of real estate properties | Property		168
Office properties under, or contractually committed for, construction or approved for redevelopment
Construction and Redevelopment Activities
Square footage of real estate properties (in square feet) | ft²		1,200
Number of real estate properties | Property		10
Single-tenant data centers | Operating office properties
Construction and Redevelopment Activities
Transaction Value		$ 44,300
Ownership percentage sold (percent)	50.00%
Number of properties contributed | Property	6
Value of properties contributed	$ 147,600
Proceeds from issuance of debt		$ 60,000
Ownership percentage (percent)	50.00%
Number of real estate properties | Property		12
Newly constructed properties placed in service
Construction and Redevelopment Activities
Square feet of properties placed in service | ft²		490
Number of real estate properties | Property		5
Newly redeveloped properties placed in service
Construction and Redevelopment Activities
Square feet of properties placed in service | ft²		55
Number of real estate properties | Property		2
Properties under construction or contractually committed for construction
Construction and Redevelopment Activities
Square footage of real estate properties (in square feet) | ft²		1,100
Number of real estate properties | Property		7
Properties completed Held-for-future lease | Office properties under, or contractually committed for, construction or approved for redevelopment
Construction and Redevelopment Activities
Number of real estate properties | Property		2
Properties under or approved for redevelopment
Construction and Redevelopment Activities
Square footage of real estate properties (in square feet) | ft²		104
Number of real estate properties | Property		3
Operating Properties
Construction and Redevelopment Activities
Number of Buildings | buillding		15
Square footage of real estate properties (in square feet) | ft²		1,126
Transaction Value		$ 210,713
Gain on Disposition		16,179
Operating Properties | Data Center Shells | Single-tenant data centers | Operating office properties
Construction and Redevelopment Activities
Gain on Disposition		$ 17,900
Number of properties contributed | buillding		6
Operating Properties | Regional Office | Arborcrest Corporate Campus
Construction and Redevelopment Activities
Number of Buildings | buillding		4
Square footage of real estate properties (in square feet) | ft²		654
Transaction Value		$ 142,800
Gain on Disposition		$ 4,742
Operating Properties | Regional Office | 8003 Corporate Drive
Construction and Redevelopment Activities
Number of Buildings | buillding		1
Square footage of real estate properties (in square feet) | ft²		18
Transaction Value		$ 2,400
Gain on Disposition		$ 0
Operating Properties | Regional Office | 8007, 8013, 8015, 8019 and 8023-8027 Corporate Drive
Construction and Redevelopment Activities
Number of Buildings | buillding		5
Square footage of real estate properties (in square feet) | ft²		130
Transaction Value		$ 14,513
Gain on Disposition		$ 1,906
Operating Properties | Fort Meade/BW Corridor | 1341 and 1343 Ashton Road
Construction and Redevelopment Activities
Number of Buildings | buillding		2
Square footage of real estate properties (in square feet) | ft²		25
Transaction Value		$ 2,900
Gain on Disposition		$ 848
Operating Properties | Fort Meade/BW Corridor | 1302, 1304 & 1306 Concourse Drive
Construction and Redevelopment Activities
Number of Buildings | buillding		3
Square footage of real estate properties (in square feet) | ft²		299
Transaction Value		$ 48,100
Gain on Disposition		$ 8,683

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Real Estate Joint Ventures (Details) $ in Thousands		1 Months Ended	9 Months Ended
	Jul. 21, 2016 USD ($) Property	Jan. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)
Investments in consolidated real estate joint ventures
Value of properties contributed			$ 22,600	$ 0
Investment balance			25,700
Maximum amount at risk			18,500
Consolidated real estate joint ventures
Investments in consolidated real estate joint ventures
Total Assets			263,503
Encumbered Assets			127,160
Total Liabilities			$ 106,543
Variable Interest Entity, Primary Beneficiary | LW Redstone Company, LLC
Investments in consolidated real estate joint ventures
Ownership (as a percent)			85.00%
Total Assets			$ 157,168
Encumbered Assets			80,154
Total Liabilities			$ 53,056
Variable Interest Entity, Primary Beneficiary | M Square Associates, LLC
Investments in consolidated real estate joint ventures
Ownership (as a percent)			50.00%
Total Assets			$ 66,053
Encumbered Assets			47,006
Total Liabilities			$ 45,807
Variable Interest Entity, Primary Beneficiary | Stevens Investors, LLC
Investments in consolidated real estate joint ventures
Ownership (as a percent)			95.00%
Total Assets			$ 40,282
Encumbered Assets			0
Total Liabilities			7,680
Value of properties contributed		$ 22,600
Distributions to joint venture		$ 13,400
Variable Interest Entity, Primary Beneficiary | Stevens Investors, LLC | Other Liabilities
Investments in consolidated real estate joint ventures
Due to Affiliate			$ 6,700
Single-tenant data centers | Operating office properties
Investments in consolidated real estate joint ventures
Value of properties contributed	$ 147,600
Ownership percentage sold (percent)	50.00%
Number of properties contributed | Property	6
Ownership percentage (percent)	50.00%

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Investing Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 51,119	$ 47,875
Notes Receivable from City of Huntsville
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 48,098	44,875
Notes Receivable from City of Huntsville | LW Redstone Company, LLC
Accounts, Notes, Loans and Financing Receivable [Line Items]
Stated interest rate (as a percent)	9.95%
Other investing loans receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 3,021	$ 3,000

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Prepaid Expenses and Other Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses	$ 28,752	$ 23,009
Lease incentives, net	19,106	11,133
Construction contract costs incurred in excess of billings	6,367	3,261
Furniture, fixtures and equipment, net	5,492	6,004
Deferred financing costs, net	3,812	5,867
Deferred tax asset, net	3,282	3,467
Other assets	6,727	7,283
Prepaid expenses and other assets, net	73,538	60,024
Taxable REIT Subsidiary
Mortgage and Other Investing Receivables [Line Items]
Deferred tax assets, valuation allowance	$ 2,100	$ 2,100

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Debt, Net (Details) - USD ($)		3 Months Ended		9 Months Ended
	Oct. 12, 2016	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Debt
Carrying Value		$ 1,873,836,000		$ 1,873,836,000		$ 2,077,752,000
Deferred financing costs, net		3,812,000		3,812,000		5,867,000
Interest costs capitalized		1,200,000	$ 1,500,000	4,300,000	$ 5,600,000
Loans payable
Debt
Deferred financing costs, net		6,900,000		6,900,000		8,000,000
Mortgage and Other Secured Loans:
Debt
Carrying Value		168,505,000		168,505,000		331,000,000
Fixed rate mortgage loans
Debt
Carrying Value		154,976,000		$ 154,976,000		281,208,000
Stated interest rates, low end of range (as a percent)				3.82%
Stated interest rates, high end of range (as a percent)				7.87%
Unamortized premium included in carrying value		$ 440,000		$ 440,000		514,000
Weighted average interest rate (as a percent)		4.20%		4.20%
Variable rate secured loans
Debt
Carrying Value		$ 13,529,000		$ 13,529,000		49,792,000
Description of variable rate basis				LIBOR
Stated interest rate (as a percent)		2.37%		2.37%
Variable rate secured loans | London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)				1.85%
Revolving Credit Facility
Debt
Carrying Value		$ 0		$ 0		43,500,000
Description of variable rate basis				LIBOR
Revolving Credit Facility | Minimum | London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)				0.875%
Revolving Credit Facility | Maximum | London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)				1.60%
Term Loan Facilities
Debt
Carrying Value		$ 516,812,000		$ 516,812,000		515,902,000
Description of variable rate basis				LIBOR
Weighted average interest rate (as a percent)		2.17%		2.17%
Increase to maximum borrowing capacity		$ 150,000,000		$ 150,000,000
Aggregate additional borrowing capacity available		430,000,000		$ 430,000,000
Term Loan Facilities | Minimum | London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)				0.90%
Term Loan Facilities | Maximum | London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)				2.60%
Term Loan Facilities | Subsequent Event
Debt
Repayments of term loan	$ 120,000,000
3.60% Senior Notes | Unsecured senior notes
Debt
Carrying Value		347,024,000		$ 347,024,000		346,714,000
Debt instrument, face amount		$ 350,000		$ 350,000
Stated interest rate (as a percent)		3.60%		3.60%
Unamortized discount included in carrying value		$ 2,000,000		$ 2,000,000		2,200,000
Interest rate on debt (as a percent)		3.70%		3.70%
5.250% Senior Notes | Unsecured senior notes
Debt
Carrying Value		$ 246,063,000		$ 246,063,000		245,731,000
Debt instrument, face amount		$ 250,000		$ 250,000
Stated interest rate (as a percent)		5.25%		5.25%
Unamortized discount included in carrying value		$ 3,500,000		$ 3,500,000		3,800,000
Interest rate on debt (as a percent)		5.49%		5.49%
3.70% Senior Notes | Unsecured senior notes
Debt
Carrying Value		$ 297,725,000		$ 297,725,000		297,378,000
Debt instrument, face amount		$ 300,000		$ 300,000
Stated interest rate (as a percent)		3.70%		3.70%
Unamortized discount included in carrying value		$ 1,800,000		$ 1,800,000		2,100,000
Interest rate on debt (as a percent)		3.85%		3.85%
5.000% Senior Notes | Unsecured senior notes
Debt
Carrying Value		$ 296,279,000		$ 296,279,000		296,019,000
Debt instrument, face amount		$ 300,000		$ 300,000
Stated interest rate (as a percent)		5.00%		5.00%
Unamortized discount included in carrying value		$ 3,100,000		$ 3,100,000		3,300,000
Interest rate on debt (as a percent)		5.15%		5.15%
Unsecured notes payable
Debt
Carrying Value		$ 1,428,000		$ 1,428,000		1,508,000
Stated interest rate (as a percent)		0.00%		0.00%
Unamortized discount included in carrying value		$ 483,000		$ 483,000		$ 554,000

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Debt, Net (Details 2) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Carrying Amount
Carrying amount and estimated fair value of debt
Long-term Debt, Fair Value	$ 1,873,836	$ 2,077,752
Carrying Amount | Unsecured senior notes
Carrying amount and estimated fair value of debt
Long-term Debt, Fair Value	1,187,091	1,185,842
Carrying Amount | Other fixed-rate debt
Carrying amount and estimated fair value of debt
Long-term Debt, Fair Value	156,404	282,716
Carrying Amount | Variable-rate debt
Carrying amount and estimated fair value of debt
Long-term Debt, Fair Value	530,341	609,194
Estimated Fair Value
Carrying amount and estimated fair value of debt
Long-term Debt, Fair Value	1,929,913	2,114,636
Estimated Fair Value | Unsecured senior notes
Carrying amount and estimated fair value of debt
Long-term Debt, Fair Value	1,233,860	1,211,658
Estimated Fair Value | Other fixed-rate debt
Carrying amount and estimated fair value of debt
Long-term Debt, Fair Value	162,974	291,991
Estimated Fair Value | Variable-rate debt
Carrying amount and estimated fair value of debt
Long-term Debt, Fair Value	$ 533,079	$ 610,987

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Interest Rate Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of gain (loss) recognized in accumulated other comprehensive loss (“AOCL”) (effective portion)	$ 407	$ (3,638)	$ (16,581)	$ (6,720)
Amount of losses reclassified from AOCL into interest expense (effective portion)	1,043	915	2,763	2,457
Interest rate swaps
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Approximate loss amount to be reclassified from AOCI to interest expense over the next 12 months	5,200		5,200
Interest rate derivatives in liability position, fair value	17,900		17,900
Termination value to settle obligations under interest rate derivative agreements	18,400		18,400
Interest rate swaps | Interest Expense
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of gain (loss) recognized in interest expense (ineffective portion)	1,523	$ 0	(347)	$ 0
Interest rate swaps | Prepaid expenses and other current assets
Fair value of interest rate derivatives and balance sheet classification
Interest rate swaps designated as cash flow hedges	0		0		$ 53
Interest rate swaps | Interest rate derivatives
Fair value of interest rate derivatives and balance sheet classification
Interest rate swaps designated as cash flow hedges	(17,272)		(17,272)		(3,160)
Designated
Fair values of interest rate swap derivatives
Fair value of interest rate swaps	(17,272)		(17,272)		(3,107)
Designated | Interest rate swap, effective date September 1, 2015, swap one
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000		$ 100,000
Fixed rate (as a percent)	1.673%		1.673%
Fair value of interest rate swaps	$ (2,339)		$ (2,339)		(1,217)
Designated | Interest rate swap, effective date September 1, 2015, swap two
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000		$ 100,000
Fixed rate (as a percent)	1.73%		1.73%
Fair value of interest rate swaps	$ (2,500)		$ (2,500)		(1,429)
Designated | Interest rate swap, effective October 13, 2015
Fair values of interest rate swap derivatives
Notional Amount	$ 13,676		$ 13,676
Fixed rate (as a percent)	1.39%		1.39%
Fair value of interest rate swaps	$ (236)		$ (236)		53
Notional amount of interest rate derivatives after scheduled amortization	12,100		12,100
Designated | Interest rate swap, effective September 1, 2016, swap one
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000		$ 100,000
Fixed rate (as a percent)	1.9013%		1.9013%
Fair value of interest rate swaps	$ (4,879)		$ (4,879)		(138)
Designated | Interest rate swap, effective September 1, 2016, swap two
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000		$ 100,000
Fixed rate (as a percent)	1.905%		1.905%
Fair value of interest rate swaps	$ (4,872)		$ (4,872)		(45)
Designated | Interest rate swap, effective September 1, 2016, swap three
Fair values of interest rate swap derivatives
Notional Amount	$ 50,000		$ 50,000
Fixed rate (as a percent)	1.9079%		1.9079%
Fair value of interest rate swaps	$ (2,446)		$ (2,446)		(32)
Designated | Interest rate swap, effective date September 2, 2014, swap one
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000		$ 100,000
Fixed rate (as a percent)	0.8055%		0.8055%
Fair value of interest rate swaps	$ 0		$ 0		(148)
Designated | Interest rate swap, effective date September 2, 2014, swap two
Fair values of interest rate swap derivatives
Notional Amount	$ 100,000		$ 100,000
Fixed rate (as a percent)	0.81%		0.81%
Fair value of interest rate swaps	$ 0		$ 0		$ (151)

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Redeemable Noncontrolling Interests (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) joint_venture	Sep. 30, 2015 USD ($)
Noncontrolling Interest [Abstract]
Number of joint ventures with redeemable noncontrolling interests | joint_venture	2
Redeemable Noncontrolling Interest [Roll Forward]
Beginning balance	$ 19,218	$ 18,417
Contributions from noncontrolling interests	22,779	0
Distributions to noncontrolling interests	(21,344)	(1,098)
Net income attributable to noncontrolling interests	1,679	1,690
Adjustment to arrive at fair value of interests	516	599
Ending balance	$ 22,848	$ 19,608

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Equity (Details) - USD ($) $ in Millions	1 Months Ended	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015
Class of Stock [Line Items]
Conversion of common units to common shares (in units/ shares)		87,000	160,160
Common Stock Issued to Public Under At-the-Market Program
Class of Stock [Line Items]
At-market-stock aggregate gross sales price	$ 200.0

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Information by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Segment financial information for real estate operations
Revenues from real estate operations	$ 130,954	$ 133,686	$ 397,965	$ 384,591
Property operating expenses	49,952	48,897	149,968	145,990
UJV NOI allocable to COPT	1,008	0	1,008	0
NOI from real estate operations	82,010	84,789	249,005	238,601
Additions to long-lived assets	22,232	141,037	51,655	307,723
Transfers from non-operating properties	34,291	142,210	154,732	304,106
Segment assets	3,634,194	3,912,092	3,634,194	3,912,092	$ 3,909,312
Defense/Information Technology Locations
Segment financial information for real estate operations
Revenues from real estate operations	101,819	98,905	305,146	292,718
Property operating expenses	37,673	34,516	112,182	108,293
UJV NOI allocable to COPT	1,008	0	1,008	0
NOI from real estate operations	65,154	64,389	193,972	184,425
Additions to long-lived assets	17,903	11,805	42,077	108,744
Transfers from non-operating properties	34,255	62,586	155,030	192,366
Segment assets	2,307,245	2,340,559	2,307,245	2,340,559
Defense/Information Technology Locations | Fort Meade/BW Corridor
Segment financial information for real estate operations
Revenues from real estate operations	61,460	61,400	184,881	182,591
Property operating expenses	20,598	20,106	64,222	63,102
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	40,862	41,294	120,659	119,489
Additions to long-lived assets	5,901	7,943	19,516	16,529
Transfers from non-operating properties	5,331	25,184	41,850	44,212
Segment assets	1,261,337	1,284,712	1,261,337	1,284,712
Defense/Information Technology Locations | Northern Virginia Defense/IT
Segment financial information for real estate operations
Revenues from real estate operations	12,231	12,875	36,404	37,383
Property operating expenses	4,462	5,150	13,310	16,120
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	7,769	7,725	23,094	21,263
Additions to long-lived assets	7,153	1,603	13,290	86,303
Transfers from non-operating properties	308	(91)	28,158	51,117
Segment assets	416,886	413,321	416,886	413,321
Defense/Information Technology Locations | Lackland Air Force Base
Segment financial information for real estate operations
Revenues from real estate operations	12,532	9,018	34,408	27,426
Property operating expenses	7,599	4,553	19,863	14,665
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	4,933	4,465	14,545	12,761
Additions to long-lived assets	0	0	0	0
Transfers from non-operating properties	3	591	240	32,150
Segment assets	132,722	134,790	132,722	134,790
Defense/Information Technology Locations | Navy Support Locations
Segment financial information for real estate operations
Revenues from real estate operations	7,232	6,886	21,164	21,337
Property operating expenses	3,374	3,287	9,573	10,075
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	3,858	3,599	11,591	11,262
Additions to long-lived assets	2,207	2,084	5,710	5,446
Transfers from non-operating properties	0	1,408	0	1,408
Segment assets	195,244	196,105	195,244	196,105
Defense/Information Technology Locations | Redstone Arsenal
Segment financial information for real estate operations
Revenues from real estate operations	3,189	3,061	9,496	8,165
Property operating expenses	1,112	888	3,050	2,605
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	2,077	2,173	6,446	5,560
Additions to long-lived assets	2,642	175	3,561	466
Transfers from non-operating properties	3,100	1,207	3,315	13,184
Segment assets	111,310	108,541	111,310	108,541
Defense/Information Technology Locations | Data Center Shells
Segment financial information for real estate operations
Revenues from real estate operations	5,175	5,665	18,793	15,816
Property operating expenses	528	532	2,164	1,726
UJV NOI allocable to COPT	1,008	0	1,008	0
NOI from real estate operations	5,655	5,133	17,637	14,090
Additions to long-lived assets	0	0	0	0
Transfers from non-operating properties	25,513	34,287	81,467	50,295
Segment assets	189,746	203,090	189,746	203,090
Regional Office
Segment financial information for real estate operations
Revenues from real estate operations	20,499	26,782	67,284	73,142
Property operating expenses	8,155	9,596	26,707	26,750
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	12,344	17,186	40,577	46,392
Additions to long-lived assets	4,168	129,259	9,107	198,589
Transfers from non-operating properties	(4)	5,505	104	22,230
Segment assets	453,766	695,490	453,766	695,490
Operating wholesale data centers
Segment financial information for real estate operations
Revenues from real estate operations	6,809	6,078	20,106	12,933
Property operating expenses	3,317	4,008	8,629	8,441
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	3,492	2,070	11,477	4,492
Additions to long-lived assets	108	0	108	108
Transfers from non-operating properties	40	73,804	(391)	89,183
Segment assets	234,551	246,806	234,551	246,806
Other Segments
Segment financial information for real estate operations
Revenues from real estate operations	1,827	1,921	5,429	5,798
Property operating expenses	807	777	2,450	2,506
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	1,020	1,144	2,979	3,292
Additions to long-lived assets	53	(27)	363	282
Transfers from non-operating properties	0	315	(11)	327
Segment assets	31,563	71,907	31,563	71,907
Segment assets
Segment financial information for real estate operations
Segment assets	$ 3,027,125	$ 3,354,762	$ 3,027,125	$ 3,354,762

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Information by Business Segment (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reconciliation of segment revenues to total revenues
Segment revenues from real estate operations	$ 130,954	$ 133,686	$ 397,965	$ 384,591
Construction contract and other service revenues	11,149	17,058	34,372	97,554
Less: Revenues from discontinued operations	0	0	0	(4)
Total revenues	142,103	150,744	432,337	482,141
Reconciliation of segment property operating expenses to property operating expenses
Segment property operating expenses	49,952	48,897	149,968	145,990
Less: Property operating expenses from discontinued operations	0	0	0	6
Total property operating expenses	49,952	48,897	149,968	145,996
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated Entities
UJV NOI allocable to COPT	1,008	0	1,008	0
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(415)	0	(415)	0
Add: Equity in income of unconsolidated non-real estate entities	1	18	21	52
Equity in income of unconsolidated entities	594	18	614	52
Computation of net operating income from service operations
Construction contract and other service revenues	11,149	17,058	34,372	97,554
Construction contract and other service expenses	(10,341)	(16,132)	(32,513)	(94,923)
NOI from service operations	$ 808	$ 926	$ 1,859	$ 2,631

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Information by Business Segment (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Reconciliation of NOI from real estate operations and NOI from service operations to (loss) income from continuing operations
NOI from real estate operations	$ 82,010	$ 84,789	$ 249,005	$ 238,601
NOI from service operations	808	926	1,859	2,631
Interest and other income	1,391	692	3,877	3,217
Equity in income of unconsolidated entities	594	18	614	52
Income tax benefit (expense)	21	(48)	28	(153)
Depreciation and other amortization associated with real estate operations	(32,015)	(38,403)	(99,790)	(103,788)
Impairment losses	(27,699)	(2,307)	(99,837)	(3,545)
General, administrative and leasing expenses	(8,855)	(7,439)	(28,764)	(22,864)
Business development expenses and land carry costs	(1,716)	(5,573)	(6,497)	(10,986)
Interest expense	(18,301)	(24,121)	(64,499)	(66,727)
NOI from discontinued operations	0	0	0	(10)
UJV NOI allocable to COPT	(1,008)	0	(1,008)	0
(Loss) gain on early extinguishment of debt	(59)	85,745	(37)	85,677
(Loss) income from continuing operations	$ (4,829)	$ 94,279	$ (45,049)	$ 122,105

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Information by Business Segment (Details 4) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Reconciliation of segment assets to total assets
Assets	$ 3,634,194	$ 3,909,312	$ 3,912,092
Segment assets
Reconciliation of segment assets to total assets
Assets	3,027,125		3,354,762
Non-operating property assets
Reconciliation of segment assets to total assets
Assets	421,364		416,540
Other assets
Reconciliation of segment assets to total assets
Assets	$ 185,705		$ 140,790

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Share-Based Compensation and Other Compensation Matters (Details)				9 Months Ended
	Jul. 02, 2016 shares	May 30, 2016 shares	Mar. 01, 2016 USD ($) shares	Sep. 30, 2016 USD ($) Percentile_Rank $ / shares shares
Other Share-based Compensation Additional Disclosures
Executive transition cost | $				$ 6,000,000
Performance share units
Share-Based Compensation
Stock awards granted (in shares or units)			26,299
Aggregate grant date fair value | $			$ 1,000,000
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%
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
Assumptions used to value stock awards
Performance period of the award				3 years
Weighted average grant date fair value (in dollars per share) | $ / shares				$ 38.21
Baseline value per common share (in dollars per share) | $ / shares				$ 23.90
Expected volatility of common shares (as a percent)				20.40%
Risk-free interest rate (as a percent)				0.96%
Restricted shares
Share-Based Compensation
Stock awards granted (in shares or units)				206,487
Aggregate grant date fair value | $				$ 5,000,000
Assumptions used to value stock awards
Weighted average grant date fair value (in dollars per share) | $ / shares				$ 24.31
Other Share-based Compensation Additional Disclosures
Shares vested (in shares)				189,569
Weighted average fair value of shares vested (in dollars per share) | $ / shares				$ 27.52
Aggregate intrinsic value of awards upon vesting | $				$ 4,700,000
Deferred share award
Share-Based Compensation
Stock awards granted (in shares or units)				24,944
Aggregate grant date fair value | $				$ 671,000
Assumptions used to value stock awards
Weighted average grant date fair value (in dollars per share) | $ / shares				$ 26.89
Other Share-based Compensation Additional Disclosures
Shares vested (in shares)				12,028
Weighted average fair value of shares vested (in dollars per share) | $ / shares				$ 26.70
Aggregate intrinsic value of awards upon vesting | $				$ 322,000
2014 and 2015 PSU Grants | Performance share units | Executive Vice President
Other Share-based Compensation Additional Disclosures
Shares issued (in shares)		10,326
2014 and 2015 PSU Grants | Performance share units | Chief Executive Officer
Other Share-based Compensation Additional Disclosures
Shares issued (in shares)	20,569

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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			9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015	Sep. 30, 2016		Sep. 30, 2015
Numerator:
(Loss) income from continuing operations		$ (4,829)		$ 94,279	$ (45,049)		$ 122,105
Gain on sales of real estate, net		34,101		15	34,101		4,000
Preferred share/unit dividends/distributions		(3,552)		(3,552)	(10,657)		(10,657)
Income from continuing operations attributable to noncontrolling interests		(1,973)		(4,494)	(2,346)		(7,322)
Income from continuing operations attributable to share-based compensation awards		(105)		(369)	(319)		(475)
Numerator for basic EPS from continuing operations attributable to COPT common shareholders		23,642		85,879	(24,270)		107,651
Convertible preferred shares/units		0		372	0		0
Dilutive effect of common units in COPLP on diluted EPS from continuing operations		0		0	0		4,225
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders		23,642		86,251	(24,270)		111,876
Numerator for basic EPS from continuing operations attributable to COPT common shareholders		23,642		85,879	(24,270)		107,651
Discontinued operations		0		0	0		156
Discontinued operations attributable to noncontrolling interests		0		0	0		(3)
Numerator for basic EPS on net income attributable to COPT common shareholders		23,642		85,879	(24,270)		107,804
Convertible preferred shares/units		0		372	0		0
Dilutive effect of common units in COPLP		0			0		4,231
Numerator for diluted EPS on net income attributable to COPT common shareholders		$ 23,642		$ 86,251	$ (24,270)		$ 112,035
Denominator (all weighted averages):
Denominator for basic EPS (common shares)		94,433		94,153	94,312		93,830
Convertible preferred shares (shares)		0		434	0		0
Dilutive effect of common units (shares)		0			0		3,697
Dilutive effect of share-based compensation awards (shares)		81		21	0		82
Denominator for diluted EPS (common shares)		94,514		94,608	94,312		97,609
Basic EPS:
(Loss) income from continuing operations (in dollars per share/unit)		$ 0.25	[1]	$ 0.91	$ (0.26)	[1]	$ 1.15	[1]
Discontinued operations (in dollars per share/unit)	[1]	0.00		0.00	0.00		0.00
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit)	[1]	0.25		0.91	(0.26)		1.15
Diluted EPS:
(Loss) income from continuing operations (in dollars per share/unit)		0.25	[1]	0.91	(0.26)	[1]	1.15	[1]
Discontinued operations (in dollars per share/unit)	[1]	0.00		0.00	0.00		0.00
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit)	[1]	$ 0.25		$ 0.91	$ (0.26)		$ 1.15
Corporate Office Properties, L.P.
Numerator:
(Loss) income from continuing operations		$ (4,829)		$ 94,279	$ (45,049)		$ 122,105
Gain on sales of real estate, net		34,101		15	34,101		4,000
Preferred share/unit dividends/distributions		(3,717)		(3,717)	(11,152)		(11,152)
Income from continuing operations attributable to noncontrolling interests		(913)		(972)	(2,803)		(2,605)
Income from continuing operations attributable to share-based compensation awards		(105)		(369)	(319)		(475)
Numerator for basic EPS from continuing operations attributable to COPT common shareholders		24,537		89,236	(25,222)		111,873
Convertible preferred shares/units		0		372	0		0
Numerator for diluted EPS from continuing operations attributable to COPT common shareholders		24,537		89,608	(25,222)		111,873
Numerator for basic EPS from continuing operations attributable to COPT common shareholders		24,537		89,236	(25,222)		111,873
Discontinued operations		0		0	0		156
Discontinued operations attributable to noncontrolling interests		0		0	0		3
Numerator for basic EPS on net income attributable to COPT common shareholders		24,537		89,236	(25,222)		112,032
Convertible preferred shares/units		0		372	0		0
Numerator for diluted EPS on net income attributable to COPT common shareholders		$ 24,537		$ 89,608	$ (25,222)		$ 112,032
Denominator (all weighted averages):
Denominator for basic EPS (common shares)		98,024		97,832	97,960		97,527
Convertible preferred shares (shares)		0		434	0		0
Dilutive effect of share-based compensation awards (shares)		81		21	0		82
Denominator for diluted EPS (common shares)		98,105		98,287	97,960		97,609
Basic EPS:
(Loss) income from continuing operations (in dollars per share/unit)	[2]	$ 0.25		$ 0.91	$ (0.26)		$ 1.15
Discontinued operations (in dollars per share/unit)	[2]	0.00		0.00	0.00		0.00
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit)	[2]	0.25		0.91	(0.26)		1.15
Diluted EPS:
(Loss) income from continuing operations (in dollars per share/unit)	[2]	0.25		0.91	(0.26)		1.15
Discontinued operations (in dollars per share/unit)	[2]	0.00		0.00	0.00		0.00
Net income (loss) attributable to COPT common shareholders (in dollars per share/unit)	[2]	$ 0.25		$ 0.91	$ (0.26)		$ 1.15

[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	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Conversion of common units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	3,591,000	3,679,000	3,648,000	0
Conversion of Series I Preferred Units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	176,000	176,000	176,000	176,000
Conversion of Series K Preferred Shares
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	434,000	0	434,000	434,000
Weighted average restricted stock and deferred shares
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	375,000	411,000	394,000	412,000
Weighted average options
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	233,000	440,000	307,000	480,000
Corporate Office Properties, L.P. | Weighted average restricted stock and deferred shares
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	375,000	411,000	394,000	412,000
Corporate Office Properties, L.P. | Weighted average options
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	233,000	440,000	307,000	480,000
Corporate Office Properties, L.P. | Conversion of Series I preferred units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	176,000	176,000	176,000	176,000
Corporate Office Properties, L.P. | Conversion of Series K preferred units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	434,000	0	434,000	434,000

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Commitments and Contingencies - Narrative (Details)	Sep. 30, 2016 USD ($) Property	Aug. 31, 2010 USD ($)
Tax incremental financing obligation
Liability recognized with regard to tax incremental financing obligation at end of current period	$ 1,300,000
Environmental Indemnity Agreement
Number of properties which were provided environmental indemnifications | Property	3
Maximum additional costs agreed to be paid by the entity under environmental indemnification agreement	$ 19,000,000
New Development and Redevelopment Obligations
Loss Contingencies [Line Items]
Purchase obligations	77,600,000
Capital Expenditures For Operating Properties
Loss Contingencies [Line Items]
Purchase obligations	60,500,000
Third Party Construction and Development
Loss Contingencies [Line Items]
Purchase obligations	10,500,000
Other Purchase Obligations
Loss Contingencies [Line Items]
Purchase obligations	$ 1,800,000
Anne Arundel County, Maryland | Tax Incremental Financing Bond
Tax incremental financing obligation
Debt instrument, face amount		$ 30,000,000

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Commitments and Contingencies - Future Minimum Payments (Details) $ in Thousands	Sep. 30, 2016 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2016	$ 307
2017	1,159
2018	1,113
2019	1,082
2020	1,089
Thereafter	86,806
Total	$ 91,556