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, 2017

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, a smaller reporting company or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company” and “emerging growth 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	Emerging growth company o
		(Do not check if a smaller reporting company)

Corporate Office Properties, L.P.

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

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. 

Corporate Office Properties Trust o

Corporate Office Properties, L.P. o

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 20, 2017, 99,609,634 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, 2017 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, 2017, COPT owned approximately 96.8% of the outstanding common units and none 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 and limited liability companies (“LLCs”); 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 and LLCs. The only other significant differences between the consolidated financial statements of COPT and those of COPLP are assets held 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, 2017 and December 31, 2016 (unaudited)	3
	Consolidated Statements of Operations for the Three and Nine Months Ended September 30, 2017 and 2016 (unaudited)	4
	Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2017 and 2016 (unaudited)	5
	Consolidated Statements of Equity for the Nine Months Ended September 30, 2017 and 2016 (unaudited)	6
	Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2017 and 2016 (unaudited)	7
Consolidated Financial Statements of Corporate Office Properties, L.P.
	Consolidated Balance Sheets as of September 30, 2017 and December 31, 2016 (unaudited)	9
	Consolidated Statements of Operations for the Three and Nine Months Ended September 30, 2017 and 2016 (unaudited)	10
	Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2017 and 2016 (unaudited)	11
	Consolidated Statements of Equity for the Nine Months Ended September 30, 2017 and 2016 (unaudited)	12
	Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2017 and 2016 (unaudited)	13
Notes to Consolidated Financial Statements (unaudited)		15
Item 2:	Management’s Discussion and Analysis of Financial Condition and Results of Operations	35
Item 3:	Quantitative and Qualitative Disclosures About Market Risk	50
Item 4:	Controls and Procedures	50
PART II: OTHER INFORMATION
Item 1:	Legal Proceedings	51
Item 1A:	Risk Factors	51
Item 2:	Unregistered Sales of Equity Securities and Use of Proceeds	51
Item 3:	Defaults Upon Senior Securities	51
Item 4:	Mine Safety Disclosures	51
Item 5:	Other Information	51
Item 6:	Exhibits	52
SIGNATURES		53

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, 2017			December 31, 2016
Assets
Properties, net:
Operating properties, net	$	2,690,712		$	2,671,831
Projects in development or held for future development	406,319			401,531
Total properties, net	3,097,031			3,073,362
Assets held for sale, net	74,415			94,654
Cash and cash equivalents	10,858			209,863
Restricted cash and marketable securities	6,173			8,193
Investment in unconsolidated real estate joint venture	25,194			25,548
Accounts receivable (net of allowance for doubtful accounts of $639 and $603, respectively)	27,624			34,438
Deferred rent receivable (net of allowance of $255 and $373, respectively)	84,743			90,219
Intangible assets on real estate acquisitions, net	64,055			78,351
Deferred leasing costs (net of accumulated amortization of $28,590 and $65,988, respectively)	47,033			41,214
Investing receivables	56,108			52,279
Prepaid expenses and other assets, net	66,538			72,764
Total assets	$	3,559,772		$	3,780,885
Liabilities and equity
Liabilities:
Debt, net	$	1,873,291		$	1,904,001
Accounts payable and accrued expenses	121,483			108,682
Rents received in advance and security deposits	26,223			29,798
Dividends and distributions payable	28,462			31,335
Deferred revenue associated with operating leases	12,047			12,666
Redeemable preferred shares of beneficial interest ($0.01 par value; 531,667 shares issued and outstanding at December 31, 2016 and none at September 30, 2017)	—			26,583
Capital lease obligation	16,347			—
Other liabilities	43,866			50,177
Total liabilities	2,121,719			2,163,242
Commitments and contingencies (Note 15)
Redeemable noncontrolling interests	23,269			22,979
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, 6,900,000 shares issued and outstanding at December 31, 2016 and none at September 30, 2017)	—			172,500
Common Shares of beneficial interest ($0.01 par value; 125,000,000 shares authorized, shares issued and outstanding of 99,608,170 at September 30, 2017 and 98,498,651 at December 31, 2016)	996			985
Additional paid-in capital	2,150,067			2,116,581
Cumulative distributions in excess of net income	(800,290		)	(765,276		)
Accumulated other comprehensive loss	(859		)	(1,731		)
Total Corporate Office Properties Trust’s shareholders’ equity	1,349,914			1,523,059
Noncontrolling interests in subsidiaries:
Common units in COPLP	44,089			49,228
Preferred units in COPLP	8,800			8,800
Other consolidated entities	11,981			13,577
Noncontrolling interests in subsidiaries	64,870			71,605
Total equity	1,414,784			1,594,664
Total liabilities, redeemable noncontrolling interest and equity	$	3,559,772		$	3,780,885

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,
	2017			2016			2017			2016
Revenues
Rental revenue	$	102,275		$	103,956		$	304,237		$	316,862
Tenant recoveries and other real estate operations revenue	24,956			26,998			78,058			81,103
Construction contract and other service revenues	29,786			11,149			65,958			34,372
Total revenues	157,017			142,103			448,253			432,337
Expenses
Property operating expenses	46,368			49,952			143,515			149,968
Depreciation and amortization associated with real estate operations	34,438			32,015			100,290			99,790
Construction contract and other service expenses	28,788			10,341			63,589			32,513
Impairment (recoveries) losses	(161		)	27,699			1,464			99,837
General, administrative and leasing expenses	7,368			8,855			23,838			28,764
Business development expenses and land carry costs	1,277			1,716			4,567			6,497
Total operating expenses	118,078			130,578			337,263			417,369
Operating income	38,939			11,525			110,990			14,968
Interest expense	(19,615		)	(18,301		)	(57,772		)	(64,499		)
Interest and other income	1,508			1,391			4,817			3,877
Loss on early extinguishment of debt	—			(59		)	(513		)	(37		)
Income (loss) before equity in income of unconsolidated entities and income taxes	20,832			(5,444		)	57,522			(45,691		)
Equity in income of unconsolidated entities	719			594			2,162			614
Income tax (expense) benefit	(57		)	21			(145		)	28
Income (loss) before gain on sales of real estate	21,494			(4,829		)	59,539			(45,049		)
Gain on sales of real estate	1,188			34,101			5,438			34,101
Net income (loss)	22,682			29,272			64,977			(10,948		)
Net (income) loss attributable to noncontrolling interests:
Common units in COPLP	(704		)	(901		)	(1,611		)	948
Preferred units in COPLP	(165		)	(165		)	(495		)	(495		)
Other consolidated entities	(897		)	(907		)	(2,738		)	(2,799		)
Net income (loss) attributable to COPT	20,916			27,299			60,133			(13,294		)
Preferred share dividends	—			(3,552		)	(6,219		)	(10,657		)
Issuance costs associated with redeemed preferred shares	—			—			(6,847		)	—
Net income (loss) attributable to COPT common shareholders	$	20,916		$	23,747		$	47,067		$	(23,951	)
Earnings per common share:
Net income (loss) attributable to COPT common shareholders - basic	$	0.21		$	0.25		$	0.47		$	(0.26	)
Net income (loss) attributable to COPT common shareholders - diluted	$	0.21		$	0.25		$	0.47		$	(0.26	)
Dividends declared per common share	$	0.275		$	0.275		$	0.825		$	0.825

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,
	2017			2016			2017			2016
Net income (loss)	$	22,682		$	29,272		$	64,977		$	(10,948	)
Other comprehensive income (loss)
Unrealized (loss) gain on interest rate derivatives	(301		)	407			(1,877		)	(16,581		)
Loss on interest rate derivatives recognized in interest expense (effective portion)	615			1,043			2,652			2,763
Loss on interest rate derivatives recognized in interest expense (ineffective portion)	—			—			88			—
Equity in other comprehensive income (loss) of equity method investee	—			—			39			(184		)
Other comprehensive income (loss)	314			1,450			902			(14,002		)
Comprehensive income (loss)	22,996			30,722			65,879			(24,950		)
Comprehensive income attributable to noncontrolling interests	(1,776		)	(2,025		)	(4,874		)	(1,820		)
Comprehensive income (loss) attributable to COPT	$	21,220		$	28,697		$	61,005		$	(26,770	)

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, 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 interests	—			—		(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
Balance at December 31, 2016 (98,498,651 common shares outstanding)	$	172,500		$	985	$	2,116,581		$	(765,276	)	$	(1,731	)	$	71,605		$	1,594,664
Redemption of preferred shares (6,900,000 shares)	(172,500		)	—		6,847			(6,847		)	—			—			(172,500		)
Conversion of common units to common shares (337,000 shares)	—			3		4,599			—			—			(4,602		)	—
Common shares issued under at-the-market program (591,042 shares)	—			6		19,662			—			—			—			19,668
Exercise of share options (5,000 shares)	—			—		150			—			—			—			150
Share-based compensation (176,477 shares issued, net of redemptions)	—			2		4,442			—			—			—			4,444
Redemption of vested equity awards	—			—		(1,869		)	—			—			—			(1,869		)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	—			—		(589		)	—			—			589			—
Comprehensive income	—			—		—			60,133			872			3,154			64,159
Dividends	—			—		—			(88,300		)	—			—			(88,300		)
Distributions to owners of common and preferred units in COPLP	—			—		—			—			—			(3,262		)	(3,262		)
Distributions to noncontrolling interests in other consolidated entities	—			—		—			—			—			(2,614		)	(2,614		)
Adjustment to arrive at fair value of redeemable noncontrolling interests	—			—		244			—			—			—			244
Balance at September 30, 2017 (99,608,170 common shares outstanding)	$	—		$	996	$	2,150,067		$	(800,290	)	$	(859	)	$	64,870		$	1,414,784

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,
	2017			2016
Cash flows from operating activities
Revenues from real estate operations received	$	390,116		$	393,300
Construction contract and other service revenues received	72,682			54,399
Property operating expenses paid	(144,187		)	(154,203		)
Construction contract and other service expenses paid	(57,189		)	(33,169		)
General, administrative, leasing, business development and land carry costs paid	(27,066		)	(27,879		)
Interest expense paid	(55,637		)	(61,662		)
Lease incentives	(9,414		)	(1,789		)
Other	1,373			976
Net cash provided by operating activities	170,678			169,973
Cash flows from investing activities
Construction, development and redevelopment	(113,678		)	(121,297		)
Tenant improvements on operating properties	(19,876		)	(26,055		)
Other capital improvements on operating properties	(15,174		)	(22,063		)
Proceeds from dispositions of properties	101,107			210,661
Proceeds from partial sale of properties, net of related debt	—			43,686
Leasing costs paid	(6,468		)	(6,024		)
Other	1,359			(991		)
Net cash (used in) provided by investing activities	(52,730		)	77,917
Cash flows from financing activities
Proceeds from debt
Revolving Credit Facility	268,000			362,500
Other debt proceeds	—			105,000
Repayments of debt
Revolving Credit Facility	(98,000		)	(406,000		)
Scheduled principal amortization	(2,878		)	(4,454		)
Other debt repayments	(200,150		)	(203,056		)
Deferred financing costs paid	—			(825		)
Net proceeds from issuance of common shares	19,834			(46		)
Redemption of preferred shares	(199,083		)	—
Common share dividends paid	(81,779		)	(78,072		)
Preferred share dividends paid	(9,305		)	(10,657		)
Distributions paid to noncontrolling interests in COPLP	(3,371		)	(3,476		)
Distributions paid to redeemable noncontrolling interests	(7,860		)	(14,329		)
Redemption of vested equity awards	(1,869		)	(2,179		)
Other	(492		)	(5,032		)
Net cash used in financing activities	(316,953		)	(260,626		)
Net decrease in cash and cash equivalents	(199,005		)	(12,736		)
Cash and cash equivalents
Beginning of period	209,863			60,310
End of period	$	10,858		$	47,574

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,
	2017			2016
Reconciliation of net income (loss) to net cash provided by operating activities:
Net income (loss)	$	64,977		$	(10,948	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	101,963			101,429
Impairment losses	1,457			99,797
(Gain) loss on interest rate derivatives	(43		)	347
Amortization of deferred financing costs and net debt discounts	3,514			4,456
Increase in deferred rent receivable	(545		)	(930		)
Gain on sales of real estate	(5,438		)	(34,101		)
Share-based compensation	4,092			5,637
Other	(3,970		)	(2,727		)
Operating changes in assets and liabilities:
Decrease in accounts receivable	7,498			3,658
Decrease in restricted cash and marketable securities	2,778			18
Decrease (increase) in prepaid expenses and other assets, net	3,190			(19,778		)
(Decrease) increase in accounts payable, accrued expenses and other liabilities	(5,220		)	31,523
Decrease in rents received in advance and security deposits	(3,575		)	(8,408		)
Net cash provided by operating activities	$	170,678		$	169,973
Supplemental schedule of non-cash investing and financing activities:
Increase in accrued capital improvements, leasing and other investing activity costs	$	17,129		$	9,963
Increase in property in connection with capital lease obligation	$	16,127		$	—
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
Increase (decrease) in fair value of derivatives applied to accumulated other comprehensive loss and noncontrolling interests	$	774		$	(13,817	)
Equity in other comprehensive income (loss) of an equity method investee	$	39		$	(184	)
Dividends/distribution payable	$	28,462		$	30,225
Decrease in noncontrolling interests and increase in shareholders’ equity in connection with the conversion of common units into common shares	$	4,602		$	1,167
Adjustments to noncontrolling interests resulting from changes in COPLP ownership	$	589		$	42
(Decrease) increase in redeemable noncontrolling interest and (increase) decrease in equity to carry redeemable noncontrolling interest at fair value	$	(244	)	$	516

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, 2017				December 31, 2016
Assets
Properties, net:
Operating properties, net	$	2,690,712			$	2,671,831
Projects in development or held for future development	406,319				401,531
Total properties, net	3,097,031				3,073,362
Assets held for sale, net	74,415				94,654
Cash and cash equivalents	10,858				209,863
Restricted cash and marketable securities	1,766				2,756
Investment in unconsolidated real estate joint venture	25,194				25,548
Accounts receivable (net of allowance for doubtful accounts of $639 and $603, respectively)	27,624				34,438
Deferred rent receivable (net of allowance of $255 and $373, respectively)	84,743				90,219
Intangible assets on real estate acquisitions, net	64,055				78,351
Deferred leasing costs (net of accumulated amortization of $28,590 and $65,988, respectively)	47,033				41,214
Investing receivables	56,108				52,279
Prepaid expenses and other assets, net	66,538				72,764
Total assets	$	3,555,365			$	3,775,448
Liabilities and equity
Liabilities:
Debt, net	$	1,873,291			$	1,904,001
Accounts payable and accrued expenses	121,483				108,682
Rents received in advance and security deposits	26,223				29,798
Distributions payable	28,462				31,335
Deferred revenue associated with operating leases	12,047				12,666
Redeemable preferred units of general partner, 531,667 units outstanding at December 31, 2016 and none at September 30, 2017	—				26,583
Capital lease obligation	16,347			—	—
Other liabilities	39,459				44,740
Total liabilities	2,117,312				2,157,805
Commitments and contingencies (Note 15)
Redeemable noncontrolling interests	23,269				22,979
Equity:
Corporate Office Properties, L.P.’s equity:
Preferred units
General partner, 6,900,000 preferred units outstanding at December 31, 2016 and none at September 30, 2017	—				172,500
Limited partner, 352,000 preferred units outstanding at September 30, 2017 and December 31, 2016	8,800				8,800
Common units, 99,608,170 and 98,498,651 held by the general partner and 3,253,391 and 3,590,391 held by limited partners at September 30, 2017 and December 31, 2016, respectively	1,394,911				1,401,597
Accumulated other comprehensive loss	(952		)		(1,854		)
Total Corporate Office Properties, L.P.’s equity	1,402,759				1,581,043
Noncontrolling interests in subsidiaries	12,025				13,621
Total equity	1,414,784				1,594,664
Total liabilities, redeemable noncontrolling interest and equity	$	3,555,365			$	3,775,448

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,
	2017			2016			2017			2016
Revenues
Rental revenue	$	102,275		$	103,956		$	304,237		$	316,862
Tenant recoveries and other real estate operations revenue	24,956			26,998			78,058			81,103
Construction contract and other service revenues	29,786			11,149			65,958			34,372
Total revenues	157,017			142,103			448,253			432,337
Expenses
Property operating expenses	46,368			49,952			143,515			149,968
Depreciation and amortization associated with real estate operations	34,438			32,015			100,290			99,790
Construction contract and other service expenses	28,788			10,341			63,589			32,513
Impairment (recoveries) losses	(161		)	27,699			1,464			99,837
General, administrative and leasing expenses	7,368			8,855			23,838			28,764
Business development expenses and land carry costs	1,277			1,716			4,567			6,497
Total operating expenses	118,078			130,578			337,263			417,369
Operating income	38,939			11,525			110,990			14,968
Interest expense	(19,615		)	(18,301		)	(57,772		)	(64,499		)
Interest and other income	1,508			1,391			4,817			3,877
Loss on early extinguishment of debt	—			(59		)	(513		)	(37		)
Income (loss) before equity in income of unconsolidated entities and income taxes	20,832			(5,444		)	57,522			(45,691		)
Equity in income of unconsolidated entities	719			594			2,162			614
Income tax (expense) benefit	(57		)	21			(145		)	28
Income (loss) before gain on sales of real estate	21,494			(4,829		)	59,539			(45,049		)
Gain on sales of real estate	1,188			34,101			5,438			34,101
Net income (loss)	22,682			29,272			64,977			(10,948		)
Net income attributable to noncontrolling interests in consolidated entities	(897		)	(913		)	(2,738		)	(2,803		)
Net income (loss) attributable to COPLP	21,785			28,359			62,239			(13,751		)
Preferred unit distributions	(165		)	(3,717		)	(6,714		)	(11,152		)
Issuance costs associated with redeemed preferred units	—			—			(6,847		)	—
Net income (loss) attributable to COPLP common unitholders	$	21,620		$	24,642		$	48,678		$	(24,903	)
Earnings per common unit:
Net income (loss) attributable to COPLP common unitholders - basic	$	0.21		$	0.25		$	0.47		$	(0.26	)
Net income (loss) attributable to COPLP common unitholders - diluted	$	0.21		$	0.25		$	0.47		$	(0.26	)
Distributions declared per common unit	$	0.275		$	0.275		$	0.825		$	0.825

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,
	2017			2016			2017			2016
Net income (loss)	$	22,682		$	29,272		$	64,977		$	(10,948	)
Other comprehensive income (loss)
Unrealized (loss) gain on interest rate derivatives	(301		)	407			(1,877		)	(16,581		)
Loss on interest rate derivatives recognized in interest expense (effective portion)	615			1,043			2,652			2,763
Loss on interest rate derivatives recognized in interest expense (ineffective portion)	—			—			88			—
Equity in other comprehensive income (loss) of equity method investee	—			—			39			(184		)
Other comprehensive income (loss)	314			1,450			902			(14,002		)
Comprehensive income (loss)	22,996			30,722			65,879			(24,950		)
Comprehensive income attributable to noncontrolling interests	(897		)	(913		)	(2,738		)	(2,803		)
Comprehensive income (loss) attributable to COPLP	$	22,099		$	29,809		$	63,141		$	(27,753	)

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, 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
Balance at December 31, 2016	352,000	$	8,800		6,900,000		$	172,500		102,089,042	$	1,401,597		$	(1,854	)	$	13,621		$	1,594,664
Redemption of preferred units resulting from redemption of preferred shares	—	—			(6,900,000	)	(172,500		)	—	—			—			—			(172,500		)
Issuance of common units resulting from common shares issued under COPT at-the-market program	—	—			—		—			591,042	19,668			—			—			19,668
Issuance of common units resulting from exercise of share options	—	—			—		—			5,000	150			—			—			150
Share-based compensation (units net of redemption)	—	—			—		—			176,477	4,444			—			—			4,444
Redemptions of vested equity awards	—	—			—		—			—	(1,869		)	—			—			(1,869		)
Comprehensive income	—	495			—		6,219			—	55,525			902			1,018			64,159
Distributions to owners of common and preferred units	—	(495		)	—		(6,219		)	—	(84,848		)	—			—			(91,562		)
Distributions to noncontrolling interests in subsidiaries	—	—			—		—			—	—			—			(2,614		)	(2,614		)
Adjustment to arrive at fair value of redeemable noncontrolling interest	—	—			—		—			—	244			—			—			244
Balance at September 30, 2017	352,000	$	8,800		—		$	—		102,861,561	$	1,394,911		$	(952	)	$	12,025		$	1,414,784

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,
	2017			2016
Cash flows from operating activities
Revenues from real estate operations received	$	390,116		$	393,300
Construction contract and other service revenues received	72,682			54,399
Property operating expenses paid	(144,187		)	(154,203		)
Construction contract and other service expenses paid	(57,189		)	(33,169		)
General, administrative, leasing, business development and land carry costs paid	(27,066		)	(27,879		)
Interest expense paid	(55,637		)	(61,662		)
Lease incentives	(9,414		)	(1,789		)
Other	1,373			976
Net cash provided by operating activities	170,678			169,973
Cash flows from investing activities
Construction, development and redevelopment	(113,678		)	(121,297		)
Tenant improvements on operating properties	(19,876		)	(26,055		)
Other capital improvements on operating properties	(15,174		)	(22,063		)
Proceeds from dispositions of properties	101,107			210,661
Proceeds from partial sale of properties, net of related debt	—			43,686
Leasing costs paid	(6,468		)	(6,024		)
Other	1,359			(991		)
Net cash (used in) provided by investing activities	(52,730		)	77,917
Cash flows from financing activities
Proceeds from debt
Revolving Credit Facility	268,000			362,500
Other debt proceeds	—			105,000
Repayments of debt
Revolving Credit Facility	(98,000		)	(406,000		)
Scheduled principal amortization	(2,878		)	(4,454		)
Other debt repayments	(200,150		)	(203,056		)
Deferred financing costs paid	—			(825		)
Net proceeds from issuance of common units	19,834			(46		)
Redemption of preferred units	(199,083		)	—
Common unit distributions paid	(84,655		)	(81,053		)
Preferred unit distributions paid	(9,800		)	(11,152		)
Distributions paid to redeemable noncontrolling interests	(7,860		)	(14,329		)
Redemption of vested equity awards	(1,869		)	(2,179		)
Other	(492		)	(5,032		)
Net cash used in financing activities	(316,953		)	(260,626		)
Net decrease in cash and cash equivalents	(199,005		)	(12,736		)
Cash and cash equivalents
Beginning of period	209,863			60,310
End of period	$	10,858		$	47,574

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,
	2017			2016
Reconciliation of net income (loss) to net cash provided by operating activities:
Net income (loss)	$	64,977		$	(10,948	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	101,963			101,429
Impairment losses	1,457			99,797
(Gain) loss on interest rate derivatives	(43		)	347
Amortization of deferred financing costs and net debt discounts	3,514			4,456
Increase in deferred rent receivable	(545		)	(930		)
Gain on sales of real estate	(5,438		)	(34,101		)
Share-based compensation	4,092			5,637
Other	(3,970		)	(2,727		)
Operating changes in assets and liabilities:
Decrease in accounts receivable	7,498			3,658
Decrease (increase) in restricted cash and marketable securities	1,748			(495		)
Decrease (increase) in prepaid expenses and other assets, net	3,190			(19,778		)
(Decrease) increase in accounts payable, accrued expenses and other liabilities	(4,190		)	32,036
Decrease in rents received in advance and security deposits	(3,575		)	(8,408		)
Net cash provided by operating activities	$	170,678		$	169,973
Supplemental schedule of non-cash investing and financing activities:
Increase in accrued capital improvements, leasing and other investing activity costs	$	17,129		$	9,963
Increase in property in connection with capital lease obligation	$	16,127		$	—
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
Increase (decrease) in fair value of derivatives applied to accumulated other comprehensive loss and noncontrolling interests	$	774		$	(13,817	)
Equity in other comprehensive income (loss) of an equity method investee	$	39		$	(184	)
Distributions payable	$	28,462		$	30,225
(Decrease) increase in redeemable noncontrolling interest and (increase) decrease in equity to carry redeemable noncontrolling interest at fair value	$	(244	)	$	516

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 the United States Government and its 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 portfolio of 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, 2017, our properties included the following:

• 159 operating office properties totaling 17.4 million square feet, including 15 triple-net leased, single-tenant data center properties. We owned six of these properties through an unconsolidated real estate joint venture;

• ten office properties under construction or redevelopment that we estimate will total approximately 1.1 million square feet upon completion, including three triple-net leased, single-tenant data center properties, three partially operational properties and two properties completed but held for future lease to the United States Government;

• 984 acres of land we controlled for future development that we believe could be developed into approximately 12.3 million square feet and an additional 152 acres of other land; and

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

COPLP owns real estate 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, 2017, COPT owned 96.8% of the outstanding COPLP common units (“common units”) and none 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 any 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.

15

 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, 2016 included in our 2016 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 2016 Annual Report on Form 10-K.

Reclassification

We reclassified certain amounts from prior periods to conform to the current period presentation of our consolidated financial statements with no effect on previously reported net income or equity.

Recent Accounting Pronouncements

We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) effective January 1, 2017 intended to simplify various aspects related to the accounting and presentation for employee 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. In connection with our adoption of this policy, we made an entity-wide accounting policy election to continue to account for potential future award forfeitures by estimating the number of awards that are expected to vest. Our adoption of this guidance did not have a material impact on our consolidated financial statements.

We adopted guidance issued by the FASB prospectively effective January 1, 2017 that clarifies the definition of a business used by entities in determining whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The definition of a business affects many areas of accounting including acquisitions, disposals, goodwill and consolidation. Under the new guidance, we expect that the majority of our future operating property acquisitions will be accounted for as asset acquisitions, whereas under the previous guidance our recent acquisitions were accounted for as business combinations; we believe that the primary effect of this change will be that transaction costs associated with future acquisitions will be capitalized rather than expensed as incurred. This guidance had no effect on our consolidated financial statements upon adoption.

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. This guidance also requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We will adopt this guidance for our annual and interim periods beginning January 1, 2018 and expect to use the modified retrospective method, under which the cumulative effect of initially applying the guidance is recognized at the date of initial application. We do not believe that our adoption of this guidance beginning on January 1, 2018 will have a material effect on our consolidated financial statements. However, as discussed further below, once the new guidance setting forth principles for the recognition, measurement, presentation and disclosure of leases goes into effect on January 1, 2019, we believe that the new revenue standard will apply to executory costs and other components of revenue due under leases that are deemed to be non-lease components (such as common area maintenance and provision of utilities), which could affect our recognition pattern for such revenue.

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 of real estate 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 January 1, 2019 using a modified retrospective transition approach at

16

the time of adoption. Early adoption is also permitted for this guidance. In addition, the guidance permits lessees and lessors to elect to apply a package of practical expedients that allow them not to reassess upon adoption: the lease classification for any expired or existing leases; their deferred recognition of incremental direct costs of leasing for any expired or existing leases; and whether any expired or existing contracts are, or contain, leases. While we are still completing our assessment of the impact of this guidance, below is a summary of the anticipated primary effects of this guidance on our accounting and reporting.

• Real estate leases in which we are the lessor:

◦ Balance sheet reporting: We believe that we will apply an approach under the new guidance that is similar to the current accounting for operating leases, in which we will continue to recognize the underlying leased asset as property on our balance sheet.

◦ Deferral of non-incremental lease costs: Under the new lease guidance, we will no longer be able to defer the recognition of non-incremental costs in connection with new or extended tenant leases (refer to amounts reported in our 2016 Annual Report on Form 10-K for amounts deferred in 2014, 2015 and 2016). Upon adoption of the new guidance, we would expense previously deferred non-incremental lease costs for existing leases unless we elect the package of practical expedients, in which case such costs would remain deferred and amortized over the remaining lease terms.

◦ Lease revenue reporting: We believe that the new revenue standard will apply to executory costs and other components of revenue deemed to be non-lease components (such as common area maintenance and provision of utilities), even when the revenue for such activities is not separately stipulated in the lease. In that case, we would need to separate the lease components of revenue due under leases from the non-lease components and the revenue from these items previously recognized on a straight-line basis under current lease guidance would be recognized under the new revenue guidance as the related services are delivered. As a result, while the total revenue recognized over time would not differ under the new guidance, the recognition pattern could be different. We are in the process of evaluating the significance of the difference in the recognition pattern that would result from this change.

• Leases in which we are the lessee:

◦ Our most significant leases as lessee are ground leases we have for certain properties; as of September 30, 2017, our future minimum rental payments under these leases totaled $90.2 million, with various expiration dates extending to the year 2100. While we are still in the process of evaluating these leases under the new guidance, we believe that we will be required to recognize a right-of-use asset and a lease liability for the present value of these minimum lease payments. We also believe that these types of leases most likely would be classified as finance leases under the new guidance, which would result in the interest component of each lease payment being recorded as interest expense and the right-of-use asset being amortized into expense using the straight-line method over the life of the lease; however, if we elect to apply the package of practical expedients, we will continue to account for our existing ground leases as operating leases upon adoption of the guidance.

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 will apply to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans, held-to-maturity debt securities, net investments in leases, and off-balance-sheet credit exposures (e.g. loan commitments). Under the new guidance, an entity will recognize its estimate of expected credit losses as an allowance, as the guidance requires that financial assets be measured on an amortized cost basis and to be presented at the net amount expected to be collected. The guidance is effective for us beginning January 1, 2020, with early adoption 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 areas addressed in the new guidance relate to debt prepayment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned and bank-owned life insurance policies, distributions received from equity method investments, beneficial interest in securitization transactions and separately identifiable cash flows and application of the predominance principle. The guidance is effective for us beginning January 1, 2018, with early adoption permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In November 2016, the FASB issued guidance that requires the statement of cash flows to explain the change during the period in the total of cash, cash equivalents and amounts described as restricted cash or restricted cash equivalents.  Under the new guidance, amounts described as restricted cash and restricted cash equivalents will be included with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows. 

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The guidance is effective for us beginning January 1, 2018, with early adoption permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In February 2017, the FASB issued guidance clarifying the scope of asset derecognition provisions and accounting for partial sales of nonfinancial assets. The new guidance requires recognition of a sale of real estate and resulting gain or loss when control transfers and the buyer has the ability to direct use of, or obtain substantially all of the remaining benefit from, the asset (which generally will occur on the closing date); the factor of continuing involvement is no longer a specific consideration for the timing of recognition. The new guidance eliminates the need to consider adequacy of buyer investment, which was replaced by additional judgments regarding collectability and intent and/or ability to pay. The new guidance also requires an entity to derecognize nonfinancial assets and in substance non financial assets once it transfers control of such assets. When an entity transfers its controlling interest in a nonfinancial asset, but retains a noncontrolling ownership interest, the entity is required to measure any non-controlling interest it receives or retains at fair value and recognize a full gain or loss on the transaction; as a result, sales and partial sales of real estate assets will now be subject to the same derecognition model as all other nonfinancial assets. As discussed further in our 2016 Annual Report on Form 10-K, we had a transaction in July 2016 accounted for as a partial sale under existing guidance that would meet the criteria for immediate full gain recognition under the new guidance; this would result in an additional $18 million in income being recognized in 2016 that is currently being amortized into income in subsequent periods under existing guidance. We do not believe that the recognition pattern for our other sales of real estate will be changed by the new guidance. We will adopt this guidance for our annual and interim periods beginning January 1, 2018 and expect to use the the full retrospective method, under which we would retrospectively restate each reporting period presented at the time of adoption.

In August 2017, the FASB issued guidance that makes targeted improvements to hedge accounting. This new guidance simplifies the application of hedge accounting and better aligns financial reporting for hedging activities with companies’ economic objectives in undertaking those activities. Under the new guidance, all changes in the fair value of highly effective cash flow hedges will be recorded in other comprehensive income instead of income. The new guidance also eases the administrative burden of hedge documentation requirements and assessing hedge effectiveness. The guidance is effective for us beginning January 1, 2019, with early adoption permitted. We are currently evaluating the impact of this guidance, including transition elections and required disclosures, on our financial statements and the timing of adoption.

3.Fair Value Measurements

Recurring Fair Value Measurements

COPT has a non-qualified elective deferred compensation plan for Trustees and 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 $4.4 million as of September 30, 2017, 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, 2017, 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

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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, 2017 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	$	4,336	$	—	$	—	$	4,336
Other	71		—		—		71
Interest rate derivatives (2)	—		126		—		126
Total assets	$	4,407	$	126	$	—	$	4,533
Liabilities:
Deferred compensation plan liability (3)	$	—	$	4,407	$	—	$	4,407
Interest rate derivatives (3)	—		316		—		316
Total liabilities	$	—	$	4,723	$	—	$	4,723

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

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

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

COPLP and Subsidiaries

The 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, 2017 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:
Interest rate derivatives (1)	$	—	$	126	$	—	$	126
Liabilities:
Interest rate derivatives (2)	$	—	$	316	$	—	$	316

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

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

Nonrecurring Fair Value Measurements

As part of our closing process for the first, second and third quarters of 2017, we conducted our quarterly review of our portfolio of long-lived assets to be held and used for indicators of impairment and found there to be no impairment losses. Further, for the respective quarters in 2017, we performed recoverability analyses for our properties classified as held for sale, which resulted in impairment losses of $1.6 million in the second quarter of 2017. These impairment losses were primarily on

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properties in White Marsh, Maryland (“White Marsh”) (included in our Regional Office and Other segments) that we reclassified to held for sale during the period and adjusted to fair value less costs to sell. These properties were sold in the third quarter.

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 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 impairment losses.

4.Properties, Net

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

	September 30, 2017			December 31, 2016
Land	$	440,771		$	433,311
Buildings and improvements	3,009,203			2,944,905
Less: Accumulated depreciation	(759,262		)	(706,385		)
Operating properties, net	$	2,690,712		$	2,671,831

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

	September 30, 2017		December 31, 2016
Land	$	216,108	$	195,521
Development in progress, excluding land	190,211		206,010
Projects in development or held for future development	$	406,319	$	401,531

Our properties held for sale included:

• as of September 30, 2017: two operating properties in our Data Center Shells sub-segment and one in our Fort Meade/BW Corridor sub-segment; and

• as of December 31, 2016: eight operating properties in White Marsh (included primarily in our Regional Office segment); one operating property in our Northern Virginia Defense/IT sub-segment; and land in White Marsh and Northern Virginia.

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

	September 30, 2017		December 31, 2016
Properties, net	$	68,081	$	85,402
Deferred rent receivable	5,582		4,241
Intangible assets on real estate acquisitions, net	—		338
Deferred leasing costs, net	742		3,636
Lease incentives, net	10		1,037
Assets held for sale, net	$	74,415	$	94,654

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2017 Dispositions

During the nine months endedSeptember 30, 2017, we sold the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Sale	Number of Buildings	Total Rentable Square Feet	Transaction Value		Gain on Sale
3120 Fairview Park Drive	Falls Church, VA	Northern Virginia Defense/IT	2/15/2017	1	190,000	$	39,000	$	—
1334 Ashton Road	Hanover, MD	Fort Meade/BW Corridor	6/9/2017	1	37,000	2,300		—
Remaining White Marsh Properties (1)	White Marsh, MD	Regional Office and Other	7/28/2017	8	412,000	47,500		1,180
Dispositions through 9/30/2017				10	639,000	$	88,800	$	1,180

(1) This sale also included land.

We also sold other land in the nine months ended September 30, 2017 for $14.3 million and recognized a gain on sale of $4.2 million.

On October 27, 2017, we sold:

• 201 Technology Drive, an operating property totaling 103,000 square feet in Lebanon, Virginia (in our Data Center Shells sub-segment), for $29.2 million; and

• 11751 Meadowville Lane, an operating property totaling 193,000 square feet in Chester, Virginia (in our Data Center Shells sub-segment), for $44.3 million. We provided a financial guaranty to the buyer under which we would indemnify it for up to $20 million in losses it could incur related to a potential defined capital event occurring on the property by June 30, 2019. Accordingly, we will not recognize the sale of this property for accounting purposes, and will reflect the sale price of the property as a liability, until the guaranty expires. We do not expect to incur any losses under this financial guaranty.

2017 Construction Activities

During the nine months endedSeptember 30, 2017, we placed into service 751,000 square feet in five newly constructed properties (including a partially operational property) and 88,000 square feet in three redeveloped properties (including a partially operational property). As of September 30, 2017, we had eight 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 two office properties under redevelopment that we estimate will total 36,000 square feet upon completion.

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, 2017 (dollars in thousands):

		Nominal
		Ownership		September 30, 2017 (1)
	Date	% as of		Total		Encumbered		Total
	Acquired	9/30/2017	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	158,937	$	76,374	$	50,344
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	70,767		45,813		46,895
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	70,383		—		23,566
				$	300,087	$	122,187	$	120,805

(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. Our partner in this joint venture received an additional distribution from the joint venture of $6.7 million in July 2017 that was reported in other liabilities on our consolidated balance sheet as of December 31, 2016.

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Unconsolidated Joint Venture

As of September 30, 2017, we owned a 50% interest in GI-COPT DC Partnership LLC (“GI-COPT”), a joint venture owning six triple-net leased, single-tenant data center properties in Virginia, that we account for using the equity method of accounting. As of September 30, 2017, we had an investment balance in GI-COPT of $25.2 million. Our balance was $17.1 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.

6.     Investing Receivables

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

	September 30, 2017		December 31, 2016
Notes receivable from the City of Huntsville	$	53,088	$	49,258
Other investing loans receivable	3,020		3,021
	$	56,108	$	52,279

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, 2017 or December 31, 2016.  The fair value of these receivables approximated their carrying amounts as of September 30, 2017 and December 31, 2016.

7.    Prepaid Expenses and Other Assets, Net

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

	September 30, 2017		December 31, 2016
Prepaid expenses	$	30,932	$	24,432
Lease incentives, net	17,202		18,276
Furniture, fixtures and equipment, net	5,422		5,204
Deferred tax asset, net (1)	2,851		3,036
Non-real estate equity method investments	2,413		2,355
Construction contract costs incurred in excess of billings	2,005		10,350
Deferred financing costs, net (2)	1,419		3,128
Other assets	4,294		5,983
Prepaid expenses and other assets, net	$	66,538	$	72,764

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

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

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8.    Debt, Net

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

	Carrying Value (1) as of
	September 30, 2017		December 31, 2016		Stated Interest Rates as of	Scheduled Maturity as of
					September 30, 2017	September 30, 2017
Mortgage and Other Secured Debt:
Fixed rate mortgage debt (2)	$	151,594	$	154,143	3.82% - 7.87% (3)	2019-2026
Variable rate secured debt	13,200		13,448		LIBOR + 1.85% (4)	October 2020
Total mortgage and other secured debt	164,794		167,591
Revolving Credit Facility	170,000		—		LIBOR + 0.875% to 1.60% (5)	May 2019 (6)
Term Loan Facilities (7)	348,371		547,494		LIBOR + 0.90% to 2.40% (8)	2020-2022
Unsecured Senior Notes
3.600%, $350,000 aggregate principal	347,445		347,128		3.60% (9)	May 2023
5.250%, $250,000 aggregate principal	246,525		246,176		5.25% (10)	February 2024
3.700%, $300,000 aggregate principal	298,200		297,843		3.70% (11)	June 2021
5.000%, $300,000 aggregate principal	296,639		296,368		5.00% (12)	July 2025
Unsecured notes payable	1,317		1,401		0% (13)	2026
Total debt, net	$	1,873,291	$	1,904,001

(1) The carrying values of our debt other than the Revolving Credit Facility reflect net deferred financing costs of $4.8 million as of September 30, 2017 and $6.1 million as of December 31, 2016.

(2)   Certain 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 $367,000 as of September 30, 2017 and $422,000 as of December 31, 2016.

(3) The weighted average interest rate on our fixed rate mortgage debt was 4.19% as of September 30, 2017.

(4)  The interest rate on our variable rate secured debt as of September 30, 2017 was 3.09%.

(5) The weighted average interest rate on the Revolving Credit Facility was 2.40% as of September 30, 2017.

(6) The facility matures in May 2019, with the ability for us to further extend such maturity by twosix-month periods at our option, provided that there is no default under the facility and we pay an extension fee of 0.075% of the total availability under the facility for each extension period.

(7)   As of September 30, 2017, we have the ability to borrow an additional $350.0 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 May 1, 2017, we repaid $200.0 million of the loan balance on a term loan scheduled to mature in 2020.

(8)  The weighted average interest rate on these loans was 2.93% as of September 30, 2017.

(9) The carrying value of these notes reflects an unamortized discount totaling $1.8 millionas of September 30, 2017 and $2.0 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%. 

(10) The carrying value of these notes reflectsan unamortized discount totaling $3.1 millionas of September 30, 2017 and $3.4 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%. 

(11) The carrying value of these notes reflects an unamortized discount totaling $1.4 millionas of September 30, 2017 and $1.7 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.85%. 

(12) The carrying value of these notes reflects an unamortized discount totaling $2.8 millionas of September 30, 2017 and $3.0 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

(13)  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 $394,000 as of September 30, 2017 and $460,000 as of December 31, 2016.

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, 2017, we were compliant with these covenants.

We capitalized interest costs of $1.1 million in the three months ended September 30, 2017, $1.2 million in the three months ended September 30, 2016, $4.2 million in the nine months ended September 30, 2017 and $4.3 million in the nine months ended September 30, 2016.

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

	September 30, 2017				December 31, 2016
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Fixed-rate debt
Unsecured Senior Notes	$	1,188,809	$	1,231,222	$	1,187,515	$	1,220,282
Other fixed-rate debt	152,911		154,781		155,544		156,887
Variable-rate debt	531,571		531,520		560,942		558,437
	$	1,873,291	$	1,917,523	$	1,904,001	$	1,935,606

9.    Interest Rate Derivatives

The following table sets forth the key terms and fair values of our interest rate swap derivatives, each of which was designated as a cash flow hedge of interest rate risk (dollars in thousands):

							Fair Value at
Notional Amount			Fixed Rate	Floating Rate Index	Effective Date	Expiration Date	September 30, 2017			December 31, 2016
$	100,000		1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	$	(237	)	$	(848	)
13,311		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	126			100
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	(27		)	(23		)
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	(22		)	48
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	(30		)	10
100,000		(2)	1.6730%	One-Month LIBOR	9/1/2015	8/1/2019	—			(701		)
							$	(190	)	$	(1,414	)

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

(2) We cash settled this derivative and interest accrued thereon for $460,000 on May 1, 2017. Since the hedged transactions associated with this derivative were still probable to occur as of the settlement date, amounts in accumulated other comprehensive loss (“AOCL”) associated with this derivative will be reclassified to interest expense through August 2019.

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, 2017			December 31, 2016
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets	$	126		$	158
Interest rate swaps designated as cash flow hedges	Other liabilities	(316		)	(1,572		)

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,
	2017			2016			2017			2016
Unrealized (loss) gain recognized in AOCL (effective portion)	$	(301	)	$	407		$	(1,877	)	$	(16,581	)
Loss reclassified from AOCL into interest expense (effective portion)	(615		)	(1,043		)	(2,652		)	(2,763		)
Gain (loss) on derivatives recognized in interest expense (ineffective portion)	34			1,523			132			(347		)
Loss reclassified from AOCL into interest expense (ineffective portion) (1)	—			—			(88		)	—

(1) Represents a loss recognized on certain interest rate swaps from the accelerated reclassification of amounts in AOCL on May 1, 2017, when we concluded that hedged forecasted transactions were probable not to occur.

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Over the next 12 months, we estimate that approximately $1.6 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. 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, 2017, the fair value of interest rate derivatives in a liability position related to these agreements was $305,000, excluding the effects of accrued interest and credit valuation adjustments. As of September 30, 2017, 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 $484,000.

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,
	2017			2016
Beginning balance	$	22,979		$	19,218
Contributions from noncontrolling interests	—			22,779
Distributions to noncontrolling interests	(1,186		)	(21,344		)
Net income attributable to noncontrolling interests	1,720			1,679
Adjustment to arrive at fair value of interests	(244		)	516
Ending balance	$	23,269		$	22,848

11.    Equity

During the nine months endedSeptember 30, 2017, COPT redeemed all of the outstanding shares of its following series of preferred shares:

• the 5.600% Series K Cumulative Redeemable Preferred Shares (the “Series K Preferred Shares”), redeemed effective January 21, 2017 at a price of $50.00 per share, or $26.6 million in the aggregate, plus accrued and unpaid dividends thereon through the date of redemption. Concurrently with this redemption, COPLP redeemed its Series K Preferred Units on the same terms. Since we made an irrevocable notification to holders of the Series K Preferred Shares in December 2016 of our intention to redeem such shares, we presented the liquidation preference of the shares/units as a liability on the consolidated balance sheets of COPT and COPLP as of December 31, 2016; we also recognized a $17,000 decrease to net income available to common shareholders/unitholders in the three months ended December 31, 2016 pertaining to the original issuance costs incurred on the shares/units; and

• the 7.375% Series L Cumulative Preferred Shares (the “Series L Preferred Shares”), redeemed effective June 27, 2017 at a price of $25.00 per share, or $172.5 million in the aggregate, plus accrued and unpaid dividends thereon up to but not including the date of redemption. Concurrently with this redemption, COPLP redeemed its Series L Preferred Units on the same terms. We also recognized a $6.8 million decrease to net income available to common shareholders/unitholders in the nine months ended September 30, 2017 pertaining to the original issuance costs incurred on the shares/units.

During the nine months endedSeptember 30, 2017, COPT issued 591,042 common shares at a weighted average price of $33.84 per share under its existing at-the-market (“ATM”) stock offering program. Net proceeds from the shares issued totaled $19.7 million, after payment of $300,000 in commissions to sales agents. COPT contributed the net proceeds from these issuances to COPLP in exchange for an equal number of units in COPLP. COPT’s remaining capacity under this ATM program is an aggregate gross sales price of $70.0 million in common share sales.

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During the nine months endedSeptember 30, 2017, certain COPLP limited partners converted 337,000 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). 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; 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”). 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, 2017
Revenues from real estate operations	$	61,254		$	12,190		$	11,024		$	7,494		$	3,532		$	6,676		$	102,170		$	16,656		$	7,398		$	1,007		$	127,231
Property operating expenses	(19,708		)	(4,343		)	(6,193		)	(3,157		)	(1,432		)	(637		)	(35,470		)	(7,406		)	(3,175		)	(317		)	(46,368		)
UJV NOI allocable to COPT	—			—			—			—			—			1,297			1,297			—			—			—			1,297
NOI from real estate operations	$	41,546		$	7,847		$	4,831		$	4,337		$	2,100		$	7,336		$	67,997		$	9,250		$	4,223		$	690		$	82,160
Additions to long-lived assets	$	5,810		$	2,587		$	55		$	1,910		$	843		$	—		$	11,205		$	5,338		$	9		$	76		$	16,628
Transfers from non-operating properties	$	5,519		$	45,554		$	—		$	8		$	(62	)	$	29,803		$	80,822		$	25		$	—		$	—		$	80,847
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
Nine Months Ended September 30, 2017
Revenues from real estate operations	$	183,393		$	34,992		$	35,687		$	21,953		$	10,616		$	17,998		$	304,639		$	52,394		$	21,201		$	4,061		$	382,295
Property operating expenses	(60,357		)	(13,014		)	(21,125		)	(9,391		)	(4,294		)	(1,873		)	(110,054		)	(21,974		)	(10,041		)	(1,446		)	(143,515		)
UJV NOI allocable to COPT	—			—			—			—			—			3,889			3,889			—			—			—			3,889
NOI from real estate operations	$	123,036		$	21,978		$	14,562		$	12,562		$	6,322		$	20,014		$	198,474		$	30,420		$	11,160		$	2,615		$	242,669
Additions to long-lived assets	$	15,085		$	6,032		$	71		$	6,309		$	1,059		$	—		$	28,556		$	16,476		$	3,588		$	203		$	48,823
Transfers from non-operating properties	$	37,094		$	45,994		$	—		$	474		$	1,643		$	55,003		$	140,208		$	—		$	8		$	18		$	140,234
Segment assets at September 30, 2017	$	1,265,569		$	400,855		$	129,657		$	194,801		$	108,884		$	258,611		$	2,358,377		$	398,579		$	226,909		$	13,347		$	2,997,212
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

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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,
	2017		2016		2017		2016
Segment revenues from real estate operations	$	127,231	$	130,954	$	382,295	$	397,965
Construction contract and other service revenues	29,786		11,149		65,958		34,372
Total revenues	$	157,017	$	142,103	$	448,253	$	432,337

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,
	2017			2016			2017			2016
UJV NOI allocable to COPT	$	1,297		$	1,008		$	3,889		$	1,008
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(577		)	(415		)	(1,724		)	(415		)
Add: Equity in (loss) income of unconsolidated non-real estate entities	(1		)	1			(3		)	21
Equity in income of unconsolidated entities	$	719		$	594		$	2,162		$	614

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,
	2017			2016			2017			2016
Construction contract and other service revenues	$	29,786		$	11,149		$	65,958		$	34,372
Construction contract and other service expenses	(28,788		)	(10,341		)	(63,589		)	(32,513		)
NOI from service operations	$	998		$	808		$	2,369		$	1,859

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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 before gain on sales of real estate as reported on our consolidated statements of operations (in thousands):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
NOI from real estate operations	$	82,160		$	82,010		$	242,669		$	249,005
NOI from service operations	998			808			2,369			1,859
Interest and other income	1,508			1,391			4,817			3,877
Equity in income of unconsolidated entities	719			594			2,162			614
Income tax (expense) benefit	(57		)	21			(145		)	28
Depreciation and other amortization associated with real estate operations	(34,438		)	(32,015		)	(100,290		)	(99,790		)
Impairment recoveries (losses)	161			(27,699		)	(1,464		)	(99,837		)
General, administrative and leasing expenses	(7,368		)	(8,855		)	(23,838		)	(28,764		)
Business development expenses and land carry costs	(1,277		)	(1,716		)	(4,567		)	(6,497		)
Interest expense	(19,615		)	(18,301		)	(57,772		)	(64,499		)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,297		)	(1,008		)	(3,889		)	(1,008		)
Loss on early extinguishment of debt	—			(59		)	(513		)	(37		)
Income (loss) before gain on sales of real estate	$	21,494		$	(4,829	)	$	59,539		$	(45,049	)

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

	September 30, 2017		September 30, 2016
Segment assets	$	2,997,212	$	3,027,125
Non-operating property assets	413,255		421,364
Other assets	149,305		185,705
Total COPT consolidated assets	$	3,559,772	$	3,634,194

The accounting policies of the segments are the same as those used to prepare our consolidated financial statements, except that discontinued operations and UJV NOI allocable to COPT are not presented separately for segment purposes.  In the segment reporting presented above, we did not allocate interest expense, depreciation and amortization, impairment (recoveries) losses, loss 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-Based Share Units (“PSUs”)

On January 1, 2017, our Board of Trustees granted 36,525 PSUs with an aggregate grant date fair value of $1.4 million to our three executives (the “January Grants”).  The PSUs have a performance period beginning on January 1, 2017 and concluding on the earlier of December 31, 2019 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.

On August 23, 2017, the January Grants were modified to include a provision that limits the earned PSUs payout percentage to 100% of the PSUs granted if COPT’s total shareholder return is negative during the performance period irrespective of its percentile rank in the peer group (the “Negative TSR Modifier”). In addition, as a result of the modification to the January Grants, on August 23, 2017, we augmented the January Grants by issuing an aggregate of 2,826 additional PSUs to the executives. Each of the PSU Certificates also includes the Negative TSR Modifier. The incremental award to the executives on August 23, 2017 resulting from these modifications totaled $12,000.

For the January Grants, we computed a grant date fair value of $38.43 per PSU using a Monte Carlo model, which included assumptions of, among other things, the following: baseline common share value of $31.22; expected volatility for COPT common shares of 19.0%; and a risk-free interest rate of 1.47%. For the award modification on August 23, 2017, we computed a pre-modification fair value of $49.66 per PSU and a post-modification fair value of $46.39 per PSU using a Monte Carlo model, which included assumptions of, among other things, the following: baseline common share value of $33.40; expected volatility for COPT common shares of 18.7%; and a risk-free interest rate of 1.36%. 

We issued 9,763 common shares on February 7, 2017 to Mr. Stephen E. Budorick, our Chief Executive Officer, in settlement of PSUs issued in 2014, representing 100% of the target award for those PSUs.

Restricted Shares

During the nine months endedSeptember 30, 2017, certain employees and non-employee members of our Board of Trustees were granted a total of 230,635 restricted common shares with an aggregate grant date fair value of $7.8 million (weighted average of $33.96 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.  Restricted shares granted to non-employee Trustees vest on the first anniversary of the grant date, provided that the Trustee remains in his or her position. During the nine months endedSeptember 30, 2017, forfeiture restrictions lapsed on 148,401 previously issued common shares; these shares had a weighted average grant date fair value of $26.18 per share, and the aggregate intrinsic value of the shares on the vesting dates was $5.0 million.

Deferred Share Awards

During the nine months endedSeptember 30, 2017, nonemployee members of our Board of Trustees were granted a total of 10,032 deferred share awards with an aggregate grant date fair value of $326,000 ($32.47 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, 2017, we issued 15,590 common shares in settlement of deferred share awards granted in 2016; these shares had a grant date fair value of $26.89 per share, and the aggregate intrinsic value of the shares on the settlement date was $508,000.

Options

During the nine months endedSeptember 30, 2017, 5,000 options to purchase common shares (“options”) were exercised.  The weighted average exercise price of these options was $29.98 per share, and the aggregate intrinsic value of the options exercised was $18,000.

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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.

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,
	2017			2016			2017			2016
Numerator:
Net income (loss) attributable to COPT	$	20,916		$	27,299		$	60,133		$	(13,294	)
Preferred share dividends	—			(3,552		)	(6,219		)	(10,657		)
Issuance costs associated with redeemed preferred shares	—			—			(6,847		)	—
Income attributable to share-based compensation awards	(95		)	(105		)	(337		)	(319		)
Numerator for basic and diluted EPS on net income (loss) attributable to COPT common shareholders	$	20,821		$	23,642		$	46,730		$	(24,270	)
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	99,112			94,433			98,855			94,312
Dilutive effect of share-based compensation awards	146			81			154			—
Denominator for diluted EPS (common shares)	99,258			94,514			99,009			94,312
Basic EPS:
Net income (loss) attributable to COPT common shareholders	$	0.21		$	0.25		$	0.47		$	(0.26	)
Diluted EPS:
Net income (loss) attributable to COPT common shareholders	$	0.21		$	0.25		$	0.47		$	(0.26	)

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,
	2017	2016	2017	2016
Conversion of common units	3,350	3,591	3,400	3,648
Conversion of Series I Preferred Units	176	176	176	176
Conversion of Series K Preferred Shares	—	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, 2017 and 2016 of 445,000 and 375,000, respectively, and for the nine months endedSeptember 30, 2017 and 2016 of 431,000 and 394,000, respectively; and

• weighted average options for the three months ended September 30, 2017 and 2016 of 40,000 and 233,000, respectively, and for the nine months endedSeptember 30, 2017 and 2016 of 80,000 and 307,000, respectively.

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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,
	2017			2016			2017			2016
Numerator:
Net income (loss) attributable to COPLP common unitholders	$	21,785		$	28,359		$	62,239		$	(13,751	)
Preferred unit distributions	(165		)	(3,717		)	(6,714		)	(11,152		)
Issuance costs associated with redeemed preferred units	—			—			(6,847		)	—
Income attributable to share-based compensation awards	(95		)	(105		)	(337		)	(319		)
Numerator for basic and diluted EPU on net income (loss) attributable to COPLP common unitholders	$	21,525		$	24,537		$	48,341		$	(25,222	)
Denominator (all weighted averages):
Denominator for basic EPU (common units)	102,462			98,024			102,255			97,960
Dilutive effect of share-based compensation awards	146			81			154			—
Denominator for diluted EPU (common units)	102,608			98,105			102,409			97,960
Basic EPU:
Net income (loss) attributable to COPLP common unitholders	$	0.21		$	0.25		$	0.47		$	(0.26	)
Diluted EPU:
Net income (loss) attributable to COPLP common unitholders	$	0.21		$	0.25		$	0.47		$	(0.26	)

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,
	2017	2016	2017	2016
Conversion of Series I preferred units	176	176	176	176
Conversion of Series K preferred units	—	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, 2017 and 2016 of 445,000 and 375,000, respectively, and for the nine months endedSeptember 30, 2017 and 2016 of 431,000 and 394,000, respectively; and

• weighted average options for the three months ended September 30, 2017 and 2016 of 40,000 and 233,000, respectively, and for the nine months endedSeptember 30, 2017 and 2016 of 80,000 and 307,000, respectively.

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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 $685,000 liability through September 30, 2017 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, 2017 follow (in thousands):

Year Ending December 31,
2017 (1)	$	320
2018	1,275
2019	1,263
2020	1,257
2021	1,260
Thereafter	85,761
	$	91,136

(1) Represents the three months ending December 31, 2017.

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Capital Lease

On May 25, 2017, we entered into a ground lease on land under development in Washington, D.C. for our Stevens Investors, LLC joint venture. The lease has a 99-year term, and we possess an option to purchase the property for one dollar (estimated to occur between 2019 and 2020). Upon inception of the lease, we recorded a $16.1 million capital lease liability on our consolidated balance sheets based on the present value of the future minimum rental payments. Future minimum rental payments due under the term of this lease as of September 30, 2017 follow (in thousands):

Year Ending December 31,
2017 (1)	$	700
2018	15,775
2020	135
Thereafter	75
Total minimum rental payments	$	16,685
Less: Amount representing interest	(338		)
Capital lease obligation	$	16,347

(1) Represents the three months ending December 31, 2017.

Contractual Obligations

We had amounts remaining to be incurred under various contractual obligations as of September 30, 2017 that included the following (excluding amounts incurred and therefore reflected as liabilities reported on our consolidated balance sheet):

• new development and redevelopment obligations of $35.1 million;

• capital expenditures for operating properties of $45.8 million;

• third party construction and development of $67.4 million; and

• other obligations of $1.1 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, 2017: 

• we finished the period with occupancy of our portfolio of operating office properties at 93.4%, including six properties owned through an unconsolidated real estate joint venture;

• we placed into service an aggregate of 839,000 square feet in eight newly constructed or redeveloped properties that were 89% leased as of September 30, 2017;

• we sold ten operating properties totaling 639,000 square feet that were 89.4% occupied for $88.8 million and other land for $14.3 million. The net proceeds from these sales were used primarily to repay borrowings under our Revolving Credit Facility and to fund cash reserves;

• we repaid $200.0 million of the loan balance on a term loan scheduled to mature in 2020 using available cash;

• COPT redeemed all of the outstanding shares of its:

• Series K Preferred Shares effective January 21, 2017 at a price of $50.00 per share, or $26.6 million in the aggregate, plus accrued and unpaid dividends thereon through the date of redemption using available cash. Concurrently with this redemption, COPLP redeemed its Series K Preferred Units on the same terms; and

• Series L Preferred Shares effective June 27, 2017 at a price of $25.00 per share, or $172.5 million in the aggregate, plus accrued and unpaid dividends thereon through the date of redemption using borrowings from our Revolving Credit Facility. Concurrently with this redemption, COPLP redeemed its Series L Preferred Units on the same terms; and

• COPT issued 591,042 common shares at a weighted average price of $33.84 per share under its ATM stock offering program. Net proceeds from the shares issued totaled $19.7 million, which were used primarily to fund cash reserves.

On October 27, 2017, we sold:

• 201 Technology Drive, an operating property totaling 103,000 square feet in Lebanon, Virginia (in our Data Center Shells sub-segment), for $29.2 million; and

• 11751 Meadowville Lane, an operating property totaling 193,000 square feet in Chester, Virginia (in our Data Center Shells sub-segment), for $44.3 million. We provided a financial guaranty to the buyer under which we would indemnify it for up to $20 million in losses it could incur related to a potential defined capital event occurring on the property by June 30, 2019. Accordingly, we will not recognize the sale of this property for accounting purposes, and will reflect the sale price of the property as a liability, until the guaranty expires. We do not expect to incur any losses under this financial guaranty.

The net proceeds from these sales were used primarily to repay borrowings under our Revolving Credit Facility

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

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discussed in the forward-looking statements. Important factors that may affect these expectations, estimates and projections include, but are not limited to:

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

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

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

• our ability to borrow on favorable terms;

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

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

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

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

• the dilutive effects of issuing additional common shares;

• our ability to achieve projected results; and

• environmental requirements.

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

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, 2017			December 31, 2016
Occupancy rates at period end
Total	93.4		%	92.1		%
Defense/IT Locations:
Fort Meade/BW Corridor	95.6		%	94.3		%
Northern Virginia Defense/IT	88.7		%	85.0		%
Lackland Air Force Base	100.0		%	100.0		%
Navy Support Locations	82.5		%	72.7		%
Redstone Arsenal	97.9		%	96.4		%
Data Center Shells	100.0		%	100.0		%
Total Defense/IT Locations	94.7		%	92.6		%
Regional Office	92.4		%	95.2		%
Other	29.4		%	52.9		%
Average contractual annual rental rate per square foot at period end (1)	$	29.94		$	30.16

(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.

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	Rentable Square Feet		Occupied Square Feet
	(in thousands)
December 31, 2016	17,190		15,831
Square feet vacated	—		(316	)
Occupancy of previously vacated space in connection with new leases (1)	—		412
Square feet constructed or redeveloped	839		866
Dispositions	(639	)	(572	)
Square feet removed from operations for redevelopment	(22	)	—
Other changes	8		5
September 30, 2017	17,376		16,226

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

During the nine months endedSeptember 30, 2017, we completed 2.2 million square feet of leasing, including 482,000 of construction and redevelopment space, and renewed 82.4% of the square footage of our lease expirations (including the effect of early renewals).

Occupancy of our Same Office Properties increased from 91.8% as of December 31, 2016 to 92.6% as of September 30, 2017.

Wholesale Data Center Property

Our 19.25 megawatt wholesale data center property had 16.9 megawatts leased as of September 30, 2017, a 2.0 megawatt increase relative to December 31, 2016.

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; 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 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”;

• 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, 2017; 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.

Since both of the measures discussed above exclude certain items includable in income before gain on sales of real estate, 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. A reconciliation of NOI from real estate operations and NOI from service operations to income before gain on sales of real estate reported on the consolidated statements of operations of COPT and subsidiaries is provided in Note 12 to our consolidated financial statements.

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Comparison of Statements of Operations for the Three Months EndedSeptember 30, 2017 and 2016

	For the Three Months Ended September 30,
	2017			2016			Variance
	(in thousands)
Revenues
Revenues from real estate operations	$	127,231		$	130,954		$	(3,723	)
Construction contract and other service revenues	29,786			11,149			18,637
Total revenues	157,017			142,103			14,914
Expenses
Property operating expenses	46,368			49,952			(3,584		)
Depreciation and amortization associated with real estate operations	34,438			32,015			2,423
Construction contract and other service expenses	28,788			10,341			18,447
Impairment (recoveries) losses	(161		)	27,699			(27,860		)
General, administrative and leasing expenses	7,368			8,855			(1,487		)
Business development expenses and land carry costs	1,277			1,716			(439		)
Total operating expenses	118,078			130,578			(12,500		)
Operating income	38,939			11,525			27,414
Interest expense	(19,615		)	(18,301		)	(1,314		)
Interest and other income	1,508			1,391			117
Loss on early extinguishment of debt	—			(59		)	59
Equity in income of unconsolidated entities	719			594			125
Income tax (expense) benefit	(57		)	21			(78		)
Income (loss) before gain on sales of real estate	21,494			(4,829		)	26,323
Gain on sales of real estate	1,188			34,101			(32,913		)
Net income	$	22,682		$	29,272		$	(6,590	)

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NOI from Real Estate Operations

	For the Three Months Ended September 30,
	2017			2016			Variance
	(Dollars in thousands, except per square foot data)
Revenues
Same Office Properties revenues
Rental revenue, excluding lease termination revenue	$	86,226		$	84,889		$	1,337
Lease termination revenue	860			389			471
Tenant recoveries and other real estate operations revenue	22,258			24,312			(2,054		)
Same Office Properties total revenues	109,344			109,590			(246		)
Constructed and redeveloped properties placed in service	6,969			2,094			4,875
Wholesale data center	7,398			6,809			589
Properties held for sale	2,723			2,700			23
Dispositions	538			9,506			(8,968		)
Other	259			255			4
	127,231			130,954			(3,723		)
Property operating expenses
Same Office Properties	(40,981		)	(42,745		)	1,764
Constructed and redeveloped properties placed in service	(1,555		)	(513		)	(1,042		)
Wholesale data center	(3,175		)	(3,317		)	142
Properties held for sale	(299		)	(283		)	(16		)
Dispositions	(124		)	(2,743		)	2,619
Other	(234		)	(351		)	117
	(46,368		)	(49,952		)	3,584
UJV NOI allocable to COPT	1,297			1,008			289
NOI from real estate operations
Same Office Properties	68,363			66,845			1,518
Constructed and redeveloped properties placed in service	5,414			1,581			3,833
Wholesale data center	4,223			3,492			731
Properties held for sale	2,424			2,417			7
Dispositions	414			6,763			(6,349		)
Other	1,322			912			410
	$	82,160		$	82,010		$	150
Same Office Properties rent statistics
Average occupancy rate	92.6		%	91.6		%	1.0		%
Average straight-line rent per occupied square foot (1)	$	6.46		$	6.43		$	0.03

(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 135 office properties, comprising 82.9% of our total operating office square footage as of September 30, 2017 (84.7% excluding the effect of properties held for sale). This pool of properties included the following changes from the pool used for purposes of comparing 2016 and 2015 in our 2016 Annual Report on Form 10-K: the addition of four properties placed in service that were 100% operational on or before January 1, 2016 and three properties acquired in 2015; and the removal of two properties disposed, two properties reclassified to held for sale and one property reclassified as redevelopment in 2017. The decrease in tenant recoveries and other real estate operations revenue and property operating expenses from our Same Office Properties was due primarily to a decrease in operating expenses directly reimbursable from tenants.

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Our NOI from constructed and redeveloped properties placed in service included 14 properties placed in service in 2016 and 2017.

NOI from Service Operations

	For the Three Months Ended September 30,
	2017		2016		Variance
	(in thousands)
Construction contract and other service revenues	$	29,786	$	11,149	$	18,637
Construction contract and other service expenses	28,788		10,341		18,447
NOI from service operations	$	998	$	808	$	190

Construction contract and other service revenue and expenses increased due primarily to a greater 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 an insignificant amount of operating income relative to our real estate operations.

Impairment (Recoveries) Losses

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

General, Administrative and Leasing Expenses

General, administrative and leasing expenses decreased due primarily to our recognition in the prior period of $1.6 million in executive transition costs, representing mostly severance and termination benefits primarily in connection with executive departures.

Gain on Sales of Real Estate

We recognized gain on sales of real estate of $1.2 million in the current period in connection with a land sale in White Marsh (discussed further in Note 4 to our consolidated financial statements). We recognized gain on sales of real estate in the prior 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 theNine Months EndedSeptember 30, 2017and2016

	For the Nine Months Ended September 30,
	2017			2016			Variance
	(in thousands)
Revenues
Revenues from real estate operations	$	382,295		$	397,965		$	(15,670	)
Construction contract and other service revenues	65,958			34,372			31,586
Total revenues	448,253			432,337			15,916
Expenses
Property operating expenses	143,515			149,968			(6,453		)
Depreciation and amortization associated with real estate operations	100,290			99,790			500
Construction contract and other service expenses	63,589			32,513			31,076
Impairment losses	1,464			99,837			(98,373		)
General, administrative and leasing expenses	23,838			28,764			(4,926		)
Business development expenses and land carry costs	4,567			6,497			(1,930		)
Total operating expenses	337,263			417,369			(80,106		)
Operating income	110,990			14,968			96,022
Interest expense	(57,772		)	(64,499		)	6,727
Interest and other income	4,817			3,877			940
Loss on early extinguishment of debt	(513		)	(37		)	(476		)
Equity in income of unconsolidated entities	2,162			614			1,548
Income tax (expense) benefit	(145		)	28			(173		)
Income (loss) before gain on sales of real estate	59,539			(45,049		)	104,588
Gain on sales of real estate	5,438			34,101			(28,663		)
Net income (loss)	$	64,977		$	(10,948	)	$	75,925

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NOI from Real Estate Operations

	For the Nine Months Ended September 30,
	2017			2016			Variance
	(Dollars in thousands, except per square foot data)
Revenues
Same Office Properties revenues
Rental revenue, excluding lease termination revenue	$	259,141		$	252,914		$	6,227
Lease termination revenue	2,083			1,678			405
Tenant recoveries and other real estate operations revenue	69,995			70,509			(514		)
Same Office Properties total revenues	331,219			325,101			6,118
Constructed and redeveloped properties placed in service	15,357			4,780			10,577
Wholesale data center	21,201			20,106			1,095
Properties held for sale	8,182			8,211			(29		)
Dispositions	5,522			38,998			(33,476		)
Other	814			769			45
	382,295			397,965			(15,670		)
Property operating expenses
Same Office Properties	(125,651		)	(125,872		)	221
Constructed and redeveloped properties placed in service	(4,206		)	(1,016		)	(3,190		)
Wholesale data center	(10,041		)	(8,629		)	(1,412		)
Properties held for sale	(918		)	(930		)	12
Dispositions	(1,695		)	(12,743		)	11,048
Other	(1,004		)	(778		)	(226		)
	(143,515		)	(149,968		)	6,453
UJV NOI allocable to COPT	3,889			1,008			2,881
NOI from real estate operations
Same Office Properties	205,568			199,229			6,339
Constructed and redeveloped properties placed in service	11,151			3,764			7,387
Wholesale data center	11,160			11,477			(317		)
Properties held for sale	7,264			7,281			(17		)
Dispositions	3,827			26,255			(22,428		)
Other	3,699			999			2,700
	$	242,669		$	249,005		$	(6,336	)
Same Office Properties rent statistics
Average occupancy rate	92.5		%	91.4		%	1.1		%
Average straight-line rent per occupied square foot (1)	$	19.46		$	19.22		$	0.24

(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 and redeveloped properties placed in service included 14 properties placed in service in 2016 and 2017.

NOI from Service Operations

	For the Nine Months Ended September 30,
	2017		2016		Variance
	(in thousands)
Construction contract and other service revenues	$	65,958	$	34,372	$	31,586
Construction contract and other service expenses	63,589		32,513		31,076
NOI from service operations	$	2,369	$	1,859	$	510

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

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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 our 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 engaged in the process of identifying properties we would 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 (“Colorado Springs”) 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;

• $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; and

• $2.4 million primarily on land in Colorado Springs and operating properties in White Marsh (included in our Regional Office Segment) classified as held for sale whose carrying amounts exceeded their estimated fair values less costs to sell based on updated negotiations with prospective buyers.

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 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.

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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 and had $161.5 million of assets held for sale as of September 30, 2016.

Refer to Note 3 to our consolidated financial statements for disclosure regarding impairment losses recognized in the current period.

General, Administrative and Leasing Expenses

General, administrative and leasing expenses decreased due primarily to our recognition in the prior period of $6.0 million in executive transition costs, representing mostly severance and termination benefits primarily in connection with executive departures, compared to $732,000 in such costs recognized in the current period.

Interest Expense 

The decrease in interest expense included the effect of a 10% decrease in our average outstanding debt in the current period relative to the prior period.

Gain on Sales of Real Estate

We recognized gain on sales of real estate of $5.4 million in the current period in connection with land sales (discussed further in Note 4 to our consolidated financial statements). We recognized gain on sales of real estate in the prior 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.

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.

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

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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; 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. 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 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

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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.

The table appearing below sets forth the computation of the above stated measures for the three and nine months endedSeptember 30, 2017 and 2016, 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,
	2017			2016			2017			2016
	(Dollars and shares in thousands,  except per share data)
Net income (loss)	$	22,682		$	29,272		$	64,977		$	(10,948	)
Add Real estate-related depreciation and amortization	34,438			32,015			100,290			99,790
Add: Depreciation and amortization on UJV allocable to COPT	310			207			932			207
Add: Impairment (recoveries) losses on previously depreciated operating properties	(159		)	25,857			1,451			81,828
Add: Gain on sales of previously depreciated operating properties	(8		)	(34,101		)	(39		)	(34,101		)
FFO	57,263			53,250			167,611			136,776
Less: Preferred share dividends	—			(3,552		)	(6,219		)	(10,657		)
Less: Noncontrolling interests-preferred units in the Operating Partnership	(165		)	(165		)	(495		)	(495		)
Less: FFO allocable to other noncontrolling interests	(917		)	(894		)	(2,801		)	(2,935		)
Less: Issuance costs associated with redeemed preferred shares	—			—			(6,847		)	—
Basic and diluted FFO allocable to share-based compensation awards	(215		)	(190		)	(616		)	(486		)
Basic and diluted FFO available to common share and common unit holders	55,966			48,449			150,633			122,203
Gain on sales of non-operating properties	(1,180		)	—			(5,399		)	—
Impairment (recoveries) losses on non-operating properties	(2		)	1,842			13			18,009
(Gain) loss on interest rate derivatives	(34		)	(1,523		)	(43		)	347
Loss on early extinguishment of debt	—			59			513			37
Issuance costs associated with redeemed preferred shares	—			—			6,847			—
Executive transition costs	2			1,639			732			6,023
Demolition costs on redevelopment properties	—			—			294			578
Diluted FFO comparability adjustments allocable to share-based compensation awards	5			(5		)	(12		)	(99		)
Diluted FFO available to common share and common unit holders, as adjusted for comparability	$	54,757		$	50,461		$	153,578		$	147,098
Weighted average common shares	99,112			94,433			98,855			94,312
Conversion of weighted average common units	3,350			3,591			3,400			3,648
Weighted average common shares/units - Basic FFO	102,462			98,024			102,255			97,960
Dilutive effect of share-based compensation awards	146			81			154			98
Weighted average common shares/units - Diluted FFO	102,608			98,105			102,409			98,058
Diluted FFO per share	$	0.55		$	0.49		$	1.47		$	1.25
Diluted FFO per share, as adjusted for comparability	$	0.53		$	0.51		$	1.50		$	1.50
Denominator for diluted EPS	99,258			94,514			99,009			94,312
Weighted average common units	3,350			3,591			3,400			3,648
Anti-dilutive EPS effect of share-based compensation awards	—			—			—			98
Denominator for diluted FFO per share measures	102,608			98,105			102,409			98,058

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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, 2017 (in thousands):

Construction, development and redevelopment	$	140,666
Tenant improvements on operating properties	21,056		(1)
Capital improvements on operating properties	13,051
	$	174,773

(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 by $0.7 million when comparing the nine months endedSeptember 30, 2017 and 2016 due primarily to lower interest expense payments in the current period due to lower outstanding debt balances, partially offset by lower net cash flows from construction contract and other services.

Net cash flow provided by investing activities decreased $130.6 million when comparing the nine months endedSeptember 30, 2017 and 2016 due primarily to a decrease in property sales in 2017 relative to 2016.

Net cash flow used in financing activities in the nine months endedSeptember 30, 2017 was $317.0 million, and included the following:

• redemption of preferred shares (or units) of $199.1 million;

• dividends and/or distributions to equity holders of $94.5 million; and

• net repayments of debt borrowings of $33.0 million; offset in part by

• net proceeds from the issuance of common shares (or units) of $19.8 million.

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 our 2016 Annual Report on Form 10-K; offset in part by

• net proceeds from debt borrowings of $146.0 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, 2017, COPT owned 96.8% of the outstanding common units and none 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 COPT will be required to fulfill its cash payment commitments under such guarantees. However, COPT’s only significant asset is its investment in COPLP.

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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, to the extent they are pursued in the future.  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, 2017, we had $10.9 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 cash available from operations and 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, 2017, the maximum borrowing capacity under this facility totaled $800.0 million, of which $630.0 million was available.

We believe that our liquidity and capital resources are adequate for our near-term and longer-term requirements without necessitating property sales.

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The following table summarizes our contractual obligations as of September 30, 2017 (in thousands):

	For the Periods Ending December 31,
	2017		2018		2019		2020		2021		Thereafter		Total
Contractual obligations (1)
Debt (2)
Balloon payments due upon maturity	$	—	$	—	$	170,000	$	112,132	$	300,000	$	1,276,829	$	1,858,961
Scheduled principal payments	1,033		4,241		4,387		4,024		3,875		10,680		28,240
Interest on debt (3)	18,318		73,020		70,114		66,708		58,846		117,338		404,344
New development and redevelopment obligations (4)(5)	23,932		10,269		856		—		—		—		35,057
Third-party construction and development obligations (5)(6)	30,083		37,270		—		—		—		—		67,353
Capital expenditures for operating properties (5)(7)	5,509		27,314		12,985		—		—		—		45,808
Capital lease obligation (principal and interest)	700		15,775		—		135		—		75		16,685
Operating leases (8)	320		1,275		1,263		1,257		1,260		85,761		91,136
Other obligations (8)	172		380		342		153		39		9		1,095
Total contractual cash obligations	$	80,067	$	169,544	$	259,947	$	184,409	$	364,020	$	1,490,692	$	2,548,679

(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 exclude accruals and payables incurred (with the exclusion of debt) 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 $13.9 million. As of September 30, 2017, maturities included $170.0 million in 2019 that may be extended to 2020, subject to certain conditions.

(3) Represents interest costs for our outstanding debt as of September 30, 2017 for the terms of such debt.  For variable rate debt, the amounts reflected above used September 30, 2017 interest rates on variable rate debt in computing interest costs for the terms of such debt. We expect to pay these items using cash flow from operations.

(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 capital expenditures for our operating properties.  We expect to pay 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 $60 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 2017.  We expect to fund the construction and development costs using primarily 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, 2017, we were compliant with these covenants.

Off-Balance Sheet Arrangements

 We had no material off-balance sheet arrangements during the nine months endedSeptember 30, 2017.

Inflation

Most of our tenants are obligated to pay their share of a property’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.

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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, 2017 our debt obligations and weighted average interest rates on debt maturing each year (dollars in thousands):

	For the Periods Ending December 31,
	2017			2018			2019			2020			2021			Thereafter			Total
Debt:
Fixed rate debt (1)	$	939		$	3,858		$	3,991		$	3,718		$	303,875		$	1,037,509		$	1,353,890
Weighted average interest rate	4.35		%	4.37		%	4.36		%	3.96		%	3.70		%	4.47		%	4.30		%
Variable rate debt (2)	$	94		$	383		$	170,396		$	112,438		$	—		$	250,000		$	533,311
Weighted average interest rate (3)	3.09		%	3.09		%	2.40		%	2.69		%	—		%	3.04		%	2.76		%

(1) Represents principal maturities only and therefore excludes net discounts and deferred financing costs of $13.9 million.

(2) As of September 30, 2017, maturities included $170.0 million in 2019 that may be extended to 2020, subject to certain conditions.

(3) The amounts reflected above used interest rates as of September 30, 2017 for variable rate debt.

The fair value of our debt was $1.9 billion as of September 30, 2017.  If interest rates had been 1% lower, the fair value of our fixed-rate debt would have increased by approximately $71 million as of September 30, 2017.

See Note 9 to our consolidated financial statements for information pertaining to interest rate swap contracts in place as of September 30, 2017 and their respective fair values.

Based on our variable-rate debt balances, including the effect of interest rate swap contracts, our interest expense would have increased by $892,000 in the nine months endedSeptember 30, 2017 if the applicable 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, 2017.  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, 2017 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, 2017.  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, 2017 were functioning effectively to provide reasonable assurance that the information required to be disclosed by the Operating Partnership in reports filed or

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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.

(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: OTHER INFORMATION

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 2016 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, 2017, 150,000 of COPLP’s common units were exchanged for 150,000 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

None

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Item 6.Exhibits

(a) Exhibits:

EXHIBIT NO.	DESCRIPTION
10.1	Form of Corporate Office Properties Trust Performance-Based Restricted Share Unit Award Certificate (2017 Omnibus Equity and Incentive Plan) (filed with the Company’s Current Report on Form 8-K dated August 23, 2017 and incorporated herein by reference).
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).

52

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:	October 27, 2017	Dated:	October 27, 2017

53

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, 2017
Earnings:
Income before equity in income of unconsolidated entities and income taxes	$	57,522
Gain on sales of real estate	5,438
Combined fixed charges and preferred share dividends (from below)	69,178
Amortization of capitalized interest	1,968
Distributed income of equity investees	1,122
Subtract:
Capitalized interest (from below)	(4,197		)
Preferred share dividends included in fixed charges	(6,219		)
Preferred unit distributions included in fixed charges	(495		)
Preferred distributions of other consolidated entities	(12		)
Total earnings	$	124,305
Combined Fixed Charges and Preferred Share Dividends:
Combined fixed charges and preferred share dividends:
Interest expense	$	57,772
Capitalized interest (internal and external)	4,197
Interest included in rental expense	483
Preferred share dividends	6,219
Preferred unit distributions	495
Preferred distributions of other consolidated entities	12
Total combined fixed charges and preferred share dividends	$	69,178
Ratio of earnings to combined fixed charges and preferred share dividends	1.80

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 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  September 30, 2017
Earnings:
Income before equity in income of unconsolidated entities and income taxes	$	57,522
Gain on sales of real estate	5,438
Fixed charges (from below)	62,464
Amortization of capitalized interest	1,968
Distributed income of equity investees	1,122
Subtract:
Capitalized interest (from below)	(4,197		)
Preferred distributions of other consolidated entities	(12		)
Total earnings	$	124,305
Fixed charges:
Interest expense	$	57,772
Capitalized interest (internal and external)	4,197
Interest included in rental expense	483
Preferred distributions of other consolidated entities	12
Total fixed charges	$	62,464
Ratio of earnings to fixed charges	1.99

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 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:	October 27, 2017	/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:	October 27, 2017	/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:	October 27, 2017	/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:	October 27, 2017	/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, 2017, 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:	October 27, 2017

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, 2017, 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:	October 27, 2017

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, 2017, 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:	October 27, 2017

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, 2017, 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:	October 27, 2017

XML

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 20, 2017
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, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		99,609,634
Document Fiscal Year Focus	2017
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, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	Q3

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Properties, net:
Operating properties, net	$ 2,690,712	$ 2,671,831
Projects in development or held for future development	406,319	401,531
Total properties, net	3,097,031	3,073,362
Assets held for sale, net	74,415	94,654
Cash and cash equivalents	10,858	209,863
Restricted cash and marketable securities	6,173	8,193
Investment in unconsolidated real estate joint venture	25,194	25,548
Accounts receivable (net of allowance for doubtful accounts of $639 and $603, respectively)	27,624	34,438
Deferred rent receivable (net of allowance of $255 and $373, respectively)	84,743	90,219
Intangible assets on real estate acquisitions, net	64,055	78,351
Deferred leasing costs (net of accumulated amortization of $28,590 and $65,988, respectively)	47,033	41,214
Investing receivables	56,108	52,279
Prepaid expenses and other assets, net	66,538	72,764
Total assets	3,559,772	3,780,885
Liabilities:
Debt, net	1,873,291	1,904,001
Accounts payable and accrued expenses	121,483	108,682
Rents received in advance and security deposits	26,223	29,798
Dividends and distributions payable	28,462	31,335
Deferred revenue associated with operating leases	12,047	12,666
Redeemable preferred shares/units	0	26,583
Capital lease obligation	16,347	0
Other liabilities	43,866	50,177
Total liabilities	2,121,719	2,163,242
Commitments and contingencies (Note 15)
Redeemable noncontrolling interests	23,269	22,979
Corporate Office Properties Trust’s shareholders’ equity:
Preferred Shares of beneficial interest at liquidation preference ($0.01 par value; 25,000,000 shares authorized, 6,900,000 shares issued and outstanding at December 31, 2016 and none at September 30, 2017)	0	172,500
Common Shares of beneficial interest	996	985
Additional paid-in capital	2,150,067	2,116,581
Cumulative distributions in excess of net income	(800,290)	(765,276)
Accumulated other comprehensive loss	(859)	(1,731)
Total Corporate Office Properties Trust’s shareholders’ equity	1,349,914	1,523,059
Noncontrolling interests in subsidiaries:
Common units in COPLP	44,089	49,228
Preferred units in COPLP	8,800	8,800
Other consolidated entities	11,981	13,577
Noncontrolling interests in subsidiaries	64,870	71,605
Total equity	1,414,784	1,594,664
Total liabilities, redeemable noncontrolling interest and equity	3,559,772	3,780,885
Corporate Office Properties, L.P.
Properties, net:
Operating properties, net	2,690,712	2,671,831
Projects in development or held for future development	406,319	401,531
Total properties, net	3,097,031	3,073,362
Assets held for sale, net	74,415	94,654
Cash and cash equivalents	10,858	209,863
Restricted cash and marketable securities	1,766	2,756
Investment in unconsolidated real estate joint venture	25,194	25,548
Accounts receivable (net of allowance for doubtful accounts of $639 and $603, respectively)	27,624	34,438
Deferred rent receivable (net of allowance of $255 and $373, respectively)	84,743	90,219
Intangible assets on real estate acquisitions, net	64,055	78,351
Deferred leasing costs (net of accumulated amortization of $28,590 and $65,988, respectively)	47,033	41,214
Investing receivables	56,108	52,279
Prepaid expenses and other assets, net	66,538	72,764
Total assets	3,555,365	3,775,448
Liabilities:
Debt, net	1,873,291	1,904,001
Accounts payable and accrued expenses	121,483	108,682
Rents received in advance and security deposits	26,223	29,798
Dividends and distributions payable	28,462	31,335
Deferred revenue associated with operating leases	12,047	12,666
Redeemable preferred shares/units	0	26,583
Capital lease obligation	16,347	0
Other liabilities	39,459	44,740
Total liabilities	2,117,312	2,157,805
Commitments and contingencies (Note 15)
Redeemable noncontrolling interests	23,269	22,979
Corporate Office Properties Trust’s shareholders’ equity:
Common Shares of beneficial interest	1,394,911	1,401,597
Accumulated other comprehensive loss	(952)	(1,854)
Total Corporate Office Properties Trust’s shareholders’ equity	1,402,759	1,581,043
Noncontrolling interests in subsidiaries:
Noncontrolling interests in subsidiaries	12,025	13,621
Total equity	1,414,784	1,594,664
Total liabilities, redeemable noncontrolling interest and equity	3,555,365	3,775,448
General Partner | Corporate Office Properties, L.P.
Corporate Office Properties Trust’s shareholders’ equity:
Preferred partners' capital accounts	0	172,500
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, 2017	Dec. 31, 2016
Allowance for doubtful accounts - AR	$ 639	$ 603
Deferred rent receivable	255	373
Deferred leasing costs, accumulated amortization	$ 28,590	$ 65,988
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	0	6,900,000
Preferred Shares of beneficial interest, shares outstanding	0	6,900,000
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	99,608,170	98,498,651
Common Shares of beneficial interest, shares outstanding	99,608,170	98,498,651
Redeemable Preferred Stock Liability Portion
Redeemable preferred units of general partner outstanding, in units	0	531,667
Preferred Shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Corporate Office Properties, L.P.
Allowance for doubtful accounts - AR	$ 639	$ 603
Deferred rent receivable	255	373
Deferred leasing costs, accumulated amortization	$ 28,590	$ 65,988
Corporate Office Properties, L.P. | Redeemable Preferred Stock Liability Portion
Redeemable preferred units of general partner outstanding, in units	0	531,667
Corporate Office Properties, L.P. | General Partner
Common Shares of beneficial interest, shares outstanding	99,608,170	98,498,651
Preferred Units, Outstanding	0	6,900,000
Corporate Office Properties, L.P. | Limited Partner
Common Shares of beneficial interest, shares outstanding	3,253,391	3,590,391
Preferred Units, Outstanding	352,000	352,000

XML

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Revenues
Rental revenue	$ 102,275	$ 103,956	$ 304,237	$ 316,862
Tenant recoveries and other real estate operations revenue	24,956	26,998	78,058	81,103
Construction contract and other service revenues	29,786	11,149	65,958	34,372
Total revenues	157,017	142,103	448,253	432,337
Expenses
Property operating expenses	46,368	49,952	143,515	149,968
Depreciation and amortization associated with real estate operations	34,438	32,015	100,290	99,790
Construction contract and other service expenses	28,788	10,341	63,589	32,513
Impairment (recoveries) losses	(161)	27,699	1,464	99,837
General, administrative and leasing expenses	7,368	8,855	23,838	28,764
Business development expenses and land carry costs	1,277	1,716	4,567	6,497
Total operating expenses	118,078	130,578	337,263	417,369
Operating income	38,939	11,525	110,990	14,968
Interest expense	(19,615)	(18,301)	(57,772)	(64,499)
Interest and other income	1,508	1,391	4,817	3,877
Loss on early extinguishment of debt	0	(59)	(513)	(37)
Income (loss) before equity in income of unconsolidated entities and income taxes	20,832	(5,444)	57,522	(45,691)
Equity in income of unconsolidated entities	719	594	2,162	614
Income tax (expense) benefit	(57)	21	(145)	28
Income (loss) before gain on sales of real estate	21,494	(4,829)	59,539	(45,049)
Gain on sales of real estate	1,188	34,101	5,438	34,101
Net income (loss)	22,682	29,272	64,977	(10,948)
Net (income) loss attributable to noncontrolling interests:
Common units in COPLP	(704)	(901)	(1,611)	948
Preferred units in COPLP	(165)	(165)	(495)	(495)
Other consolidated entities	(897)	(907)	(2,738)	(2,799)
Net income (loss) attributable to COPT	20,916	27,299	60,133	(13,294)
Preferred share/unit dividends/distributions	0	(3,552)	(6,219)	(10,657)
Issuance costs associated with redeemed preferred shares	0	0	(6,847)	0
Net income (loss) attributable to COPT common shareholders	$ 20,916	$ 23,747	$ 47,067	$ (23,951)
Earnings per common share:
Net income (loss) attributable to COPT common shareholders - basic (in dollars per share/unit)	$ 0.21	$ 0.25	$ 0.47	$ (0.26)
Net income (loss) attributable to COPT common shareholders - diluted (in dollars per share/unit)	0.21	0.25	0.47	(0.26)
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	$ 102,275	$ 103,956	$ 304,237	$ 316,862
Tenant recoveries and other real estate operations revenue	24,956	26,998	78,058	81,103
Construction contract and other service revenues	29,786	11,149	65,958	34,372
Total revenues	157,017	142,103	448,253	432,337
Expenses
Property operating expenses	46,368	49,952	143,515	149,968
Depreciation and amortization associated with real estate operations	34,438	32,015	100,290	99,790
Construction contract and other service expenses	28,788	10,341	63,589	32,513
Impairment (recoveries) losses	(161)	27,699	1,464	99,837
General, administrative and leasing expenses	7,368	8,855	23,838	28,764
Business development expenses and land carry costs	1,277	1,716	4,567	6,497
Total operating expenses	118,078	130,578	337,263	417,369
Operating income	38,939	11,525	110,990	14,968
Interest expense	(19,615)	(18,301)	(57,772)	(64,499)
Interest and other income	1,508	1,391	4,817	3,877
Loss on early extinguishment of debt	0	(59)	(513)	(37)
Income (loss) before equity in income of unconsolidated entities and income taxes	20,832	(5,444)	57,522	(45,691)
Equity in income of unconsolidated entities	719	594	2,162	614
Income tax (expense) benefit	(57)	21	(145)	28
Income (loss) before gain on sales of real estate	21,494	(4,829)	59,539	(45,049)
Gain on sales of real estate	1,188	34,101	5,438	34,101
Net income (loss)	22,682	29,272	64,977	(10,948)
Net (income) loss attributable to noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated entities	(897)	(913)	(2,738)	(2,803)
Net income (loss) attributable to COPT	21,785	28,359	62,239	(13,751)
Preferred share/unit dividends/distributions	(165)	(3,717)	(6,714)	(11,152)
Issuance costs associated with redeemed preferred shares	0	0	(6,847)	0
Net income (loss) attributable to COPT common shareholders	$ 21,620	$ 24,642	$ 48,678	$ (24,903)
Earnings per common share:
Net income (loss) attributable to COPT common shareholders - basic (in dollars per share/unit)	$ 0.21	$ 0.25	$ 0.47	$ (0.26)
Net income (loss) attributable to COPT common shareholders - diluted (in dollars per share/unit)	0.21	0.25	0.47	(0.26)
Dividends declared per common share/unit (in dollars per share)	$ 0.275	$ 0.275	$ 0.825	$ 0.825

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Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Net income (loss)	$ 22,682	$ 29,272	$ 64,977	$ (10,948)
Other comprehensive income (loss)
Unrealized (loss) gain on interest rate derivatives	(301)	407	(1,877)	(16,581)
Loss on interest rate derivatives recognized in interest expense (effective portion)	615	1,043	2,652	2,763
Loss on interest rate derivatives recognized in interest expense (ineffective portion)	0	0	88	0
Equity in other comprehensive income (loss) of equity method investee	0	0	39	(184)
Other comprehensive income (loss)	314	1,450	902	(14,002)
Comprehensive income (loss)	22,996	30,722	65,879	(24,950)
Comprehensive income attributable to noncontrolling interests	(1,776)	(2,025)	(4,874)	(1,820)
Comprehensive income (loss) attributable to COPT	21,220	28,697	61,005	(26,770)
Corporate Office Properties, L.P.
Net income (loss)	22,682	29,272	64,977	(10,948)
Other comprehensive income (loss)
Unrealized (loss) gain on interest rate derivatives	(301)	407	(1,877)	(16,581)
Loss on interest rate derivatives recognized in interest expense (effective portion)	615	1,043	2,652	2,763
Loss on interest rate derivatives recognized in interest expense (ineffective portion)	0	0	88	0
Equity in other comprehensive income (loss) of equity method investee	0	0	39	(184)
Other comprehensive income (loss)	314	1,450	902	(14,002)
Comprehensive income (loss)	22,996	30,722	65,879	(24,950)
Comprehensive income attributable to noncontrolling interests	(897)	(913)	(2,738)	(2,803)
Comprehensive income (loss) attributable to COPT	$ 22,099	$ 29,809	$ 63,141	$ (27,753)

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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: 94,531,512 shares and 98,498,651 shares as of December 31, 2015 and 2016, 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		7,431,667
Balance (in units/shares) at Dec. 31, 2015	94,531,512								98,208,903
Increase (Decrease) in Shareholders' Equity
Conversion of common units to common shares (COPT: 87,000 and 337,000 shares as for the nine months ended September 30, 2016 and 2017, respectively)	$ 0		1	1,166			(1,167)
Costs associated with common shares issued to the public (in shares)									0
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: 146,274 and 176,477 shares issued, net of redemptions for the nine months ended September 30, 2016 and 2017, 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 interests	(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
Balance (preferred units) at Sep. 30, 2016													352,000		7,431,667
Balance (COPT: 94,764,786 shares and 99,608,170 shares as of September 30, 2016 and 2017, 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
Balance (COPT: 94,531,512 shares and 98,498,651 shares as of December 31, 2015 and 2016, respectively) at Dec. 31, 2016	$ 1,594,664	172,500	985	2,116,581	(765,276)	(1,731)	71,605	1,594,664	$ 1,401,597	(1,854)	13,621		$ 8,800		$ 172,500
Balance (preferred units) at Dec. 31, 2016												352,000	352,000	6,900,000	6,900,000
Balance (in units/shares) at Dec. 31, 2016	98,498,651								102,089,042			3,590,391		98,498,651
Increase (Decrease) in Shareholders' Equity
Redemption of preferred shares (6,900,000 shares)	$ (172,500)	$ (172,500)		6,847	(6,847)			(172,500)							$ (172,500)
Redemption of preferred units resulting from redemption of preferred shares (in units/shares)		(6,900,000)													(6,900,000)
Conversion of common units to common shares (COPT: 87,000 and 337,000 shares as for the nine months ended September 30, 2016 and 2017, respectively)	0		3	4,599			(4,602)
Issuance of common units resulting from common shares issued under at-the-market program (in units)									591,042
Issuance of common units resulting from common shares issued under at-the-market program (COPT: 591,042 shares for the nine months ended September 30, 2017)	$ 19,668		6	19,662				19,668	$ 19,668
Issuance of common units resulting from exercise of share options (COPT: 5,000 shares as for the nine months ended September 30, 2017)	5,000								5,000
Issuance of common units resulting from exercise of share options	$ 150			150				150	$ 150
Share-based compensation issuance, net of redemptions (in units/shares)	176,477								176,477
Share-based compensation issuance, net of redemptions (COPT: 146,274 and 176,477 shares issued, net of redemptions for the nine months ended September 30, 2016 and 2017, respectively)	$ 4,444		2	4,442				4,444	$ 4,444
Redemption of vested equity awards	(1,869)			(1,869)				(1,869)	(1,869)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	0			(589)			589
Comprehensive income (loss)	64,159				60,133	872	3,154	64,159	55,525	902	1,018		$ 495		$ 6,219
Dividends / Distributions to owners of common and preferred units	(88,300)				(88,300)			(91,562)	(84,848)				$ (495)		$ (6,219)
Distributions to owners of common and preferred units in COPLP	(3,262)						(3,262)
Distributions to noncontrolling interests in subsidiaries	(2,614)						(2,614)	(2,614)			(2,614)
Adjustment to arrive at fair value of redeemable noncontrolling interests	$ 244			244				244	$ 244
Balance (in units/shares) at Sep. 30, 2017	99,608,170								102,861,561.000			3,253,391		99,608,170
Balance (preferred units) at Sep. 30, 2017												352,000	352,000	0	0
Balance (COPT: 94,764,786 shares and 99,608,170 shares as of September 30, 2016 and 2017, respectively) at Sep. 30, 2017	$ 1,414,784	$ 0	$ 996	$ 2,150,067	$ (800,290)	$ (859)	$ 64,870	$ 1,414,784	$ 1,394,911	$ (952)	$ 12,025		$ 8,800		$ 0

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Consolidated Statements of Equity (Parenthetical) - shares	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Balance (in units/ shares)	99,608,170	94,764,786	98,498,651	94,531,512
Conversion of common units to common shares (in units/shares)	337,000	87,000
Issuance of common units resulting from exercise of share options (in shares or units)	5,000
Share-based compensation issuance, net of redemptions (in units/shares)	176,477	146,274
Common Shares
Issuance of common units resulting from common shares issued under at-the-market program (in units)	591,042
Preferred Shares
Redemption of preferred units resulting from redemption of preferred shares (in units/shares)	6,900,000

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash flows from operating activities
Revenues from real estate operations received	$ 390,116	$ 393,300
Construction contract and other service revenues received	72,682	54,399
Property operating expenses paid	(144,187)	(154,203)
Construction contract and other service expenses paid	(57,189)	(33,169)
General, administrative, leasing, business development and land carry costs paid	(27,066)	(27,879)
Interest expense paid	(55,637)	(61,662)
Lease incentives	(9,414)	(1,789)
Other	1,373	976
Net cash provided by operating activities	170,678	169,973
Cash flows from investing activities
Construction, development and redevelopment	(113,678)	(121,297)
Tenant improvements on operating properties	(19,876)	(26,055)
Other capital improvements on operating properties	(15,174)	(22,063)
Proceeds from dispositions of properties	101,107	210,661
Proceeds from partial sale of properties, net of related debt	0	43,686
Leasing costs paid	(6,468)	(6,024)
Other	1,359	(991)
Net cash (used in) provided by investing activities	(52,730)	77,917
Proceeds from debt
Revolving Credit Facility	268,000	362,500
Other debt proceeds	0	105,000
Repayments of debt
Revolving Credit Facility	(98,000)	(406,000)
Scheduled principal amortization	(2,878)	(4,454)
Other debt repayments	(200,150)	(203,056)
Deferred financing costs paid	0	(825)
Net proceeds from issuance of common shares/units	19,834	(46)
Redemption of preferred shares/units	(199,083)	0
Common share/unit dividends/distributions paid	(81,779)	(78,072)
Preferred share/unit dividends/distributions paid	(9,305)	(10,657)
Distributions paid to noncontrolling interests in COPLP	(3,371)	(3,476)
Distributions paid to redeemable noncontrolling interests	(7,860)	(14,329)
Redemption of vested equity awards	(1,869)	(2,179)
Other	(492)	(5,032)
Net cash used in financing activities	(316,953)	(260,626)
Net decrease in cash and cash equivalents	(199,005)	(12,736)
Cash and cash equivalents
Beginning of period	209,863	60,310
End of period	10,858	47,574
Reconciliation of net income (loss) to net cash provided by operating activities:
Net income (loss)	64,977	(10,948)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	101,963	101,429
Impairment losses	1,457	99,797
(Gain) loss on interest rate derivatives	(43)	347
Amortization of deferred financing costs and net debt discounts	3,514	4,456
Increase in deferred rent receivable	(545)	(930)
Gain on sales of real estate	(5,438)	(34,101)
Share-based compensation	4,092	5,637
Other	(3,970)	(2,727)
Operating changes in assets and liabilities:
Decrease in accounts receivable	7,498	3,658
Decrease in restricted cash and marketable securities	2,778	18
Decrease (increase) in prepaid expenses and other assets, net	3,190	(19,778)
(Decrease) increase in accounts payable, accrued expenses and other liabilities	(5,220)	31,523
Decrease in rents received in advance and security deposits	(3,575)	(8,408)
Net cash provided by operating activities	170,678	169,973
Supplemental schedule of non-cash investing and financing activities:
Increase in accrued capital improvements, leasing and other investing activity costs	17,129	9,963
Increase in property in connection with capital lease obligation	16,127	0
Increase in property and redeemable noncontrolling interests in connection with property contributed in a joint venture	0	22,600
Decrease in redeemable noncontrolling interests and increase in other liabilities in connection with distribution payable to redeemable noncontrolling interest	0	6,683
Non-cash changes from partial sale of properties, net of debt:
Decrease in properties, net	0	(114,597)
Increase in investment in unconsolidated real estate joint venture	0	25,680
Decrease in debt	0	59,534
Other net decreases in assets and liabilities	0	3,619
Increase (decrease) in fair value of derivatives applied to accumulated other comprehensive loss and noncontrolling interests	774	(13,817)
Equity in other comprehensive income (loss) of an equity method investee	39	(184)
Dividends/distributions payable	28,462	30,225
Decrease in noncontrolling interests and increase in shareholders’ equity in connection with the conversion of common units into common shares	4,602	1,167
Adjustments to noncontrolling interests resulting from changes in COPLP ownership	589	42
(Decrease) increase in redeemable noncontrolling interest and (increase) decrease in equity to carry redeemable noncontrolling interest at fair value	(244)	516
Corporate Office Properties, L.P.
Cash flows from operating activities
Revenues from real estate operations received	390,116	393,300
Construction contract and other service revenues received	72,682	54,399
Property operating expenses paid	(144,187)	(154,203)
Construction contract and other service expenses paid	(57,189)	(33,169)
General, administrative, leasing, business development and land carry costs paid	(27,066)	(27,879)
Interest expense paid	(55,637)	(61,662)
Lease incentives	(9,414)	(1,789)
Other	1,373	976
Net cash provided by operating activities	170,678	169,973
Cash flows from investing activities
Construction, development and redevelopment	(113,678)	(121,297)
Tenant improvements on operating properties	(19,876)	(26,055)
Other capital improvements on operating properties	(15,174)	(22,063)
Proceeds from dispositions of properties	101,107	210,661
Proceeds from partial sale of properties, net of related debt	0	43,686
Leasing costs paid	(6,468)	(6,024)
Other	1,359	(991)
Net cash (used in) provided by investing activities	(52,730)	77,917
Proceeds from debt
Revolving Credit Facility	268,000	362,500
Other debt proceeds	0	105,000
Repayments of debt
Revolving Credit Facility	(98,000)	(406,000)
Scheduled principal amortization	(2,878)	(4,454)
Other debt repayments	(200,150)	(203,056)
Deferred financing costs paid	0	(825)
Net proceeds from issuance of common shares/units	19,834	(46)
Redemption of preferred shares/units	(199,083)	0
Common share/unit dividends/distributions paid	(84,655)	(81,053)
Preferred share/unit dividends/distributions paid	(9,800)	(11,152)
Distributions paid to redeemable noncontrolling interests	(7,860)	(14,329)
Redemption of vested equity awards	(1,869)	(2,179)
Other	(492)	(5,032)
Net cash used in financing activities	(316,953)	(260,626)
Net decrease in cash and cash equivalents	(199,005)	(12,736)
Cash and cash equivalents
Beginning of period	209,863	60,310
End of period	10,858	47,574
Reconciliation of net income (loss) to net cash provided by operating activities:
Net income (loss)	64,977	(10,948)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	101,963	101,429
Impairment losses	1,457	99,797
(Gain) loss on interest rate derivatives	(43)	347
Amortization of deferred financing costs and net debt discounts	3,514	4,456
Increase in deferred rent receivable	(545)	(930)
Gain on sales of real estate	(5,438)	(34,101)
Share-based compensation	4,092	5,637
Other	(3,970)	(2,727)
Operating changes in assets and liabilities:
Decrease in accounts receivable	7,498	3,658
Decrease in restricted cash and marketable securities	1,748	(495)
Decrease (increase) in prepaid expenses and other assets, net	3,190	(19,778)
(Decrease) increase in accounts payable, accrued expenses and other liabilities	(4,190)	32,036
Decrease in rents received in advance and security deposits	(3,575)	(8,408)
Net cash provided by operating activities	170,678	169,973
Supplemental schedule of non-cash investing and financing activities:
Increase in accrued capital improvements, leasing and other investing activity costs	17,129	9,963
Increase in property in connection with capital lease obligation	16,127	0
Increase in property and redeemable noncontrolling interests in connection with property contributed in a joint venture	0	22,600
Decrease in redeemable noncontrolling interests and increase in other liabilities in connection with distribution payable to redeemable noncontrolling interest	0	6,683
Non-cash changes from partial sale of properties, net of debt:
Decrease in properties, net	0	(114,597)
Increase in investment in unconsolidated real estate joint venture	0	25,680
Decrease in debt	0	59,534
Other net decreases in assets and liabilities	0	3,619
Increase (decrease) in fair value of derivatives applied to accumulated other comprehensive loss and noncontrolling interests	774	(13,817)
Equity in other comprehensive income (loss) of an equity method investee	39	(184)
Dividends/distributions payable	28,462	30,225
(Decrease) increase in redeemable noncontrolling interest and (increase) decrease in equity to carry redeemable noncontrolling interest at fair value	$ (244)	$ 516

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Organization

9 Months Ended

Sep. 30, 2017

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 the United States Government and its 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 portfolio of 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, 2017, our properties included the following:

• 159 operating office properties totaling 17.4 million square feet, including 15 triple-net leased, single-tenant data center properties. We owned six of these properties through an unconsolidated real estate joint venture;

• ten office properties under construction or redevelopment that we estimate will total approximately 1.1 million square feet upon completion, including three triple-net leased, single-tenant data center properties, three partially operational properties and two properties completed but held for future lease to the United States Government;

• 984 acres of land we controlled for future development that we believe could be developed into approximately 12.3 million square feet and an additional 152 acres of other land; and

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

COPLP owns real estate 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, 2017, COPT owned 96.8% of the outstanding COPLP common units (“common units”) and none 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 any 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, 2017

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, 2016 included in our 2016 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 2016 Annual Report on Form 10-K.

Reclassification

We reclassified certain amounts from prior periods to conform to the current period presentation of our consolidated financial statements with no effect on previously reported net income or equity.

Recent Accounting Pronouncements

We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) effective January 1, 2017 intended to simplify various aspects related to the accounting and presentation for employee 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. In connection with our adoption of this policy, we made an entity-wide accounting policy election to continue to account for potential future award forfeitures by estimating the number of awards that are expected to vest. Our adoption of this guidance did not have a material impact on our consolidated financial statements.

We adopted guidance issued by the FASB prospectively effective January 1, 2017 that clarifies the definition of a business used by entities in determining whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The definition of a business affects many areas of accounting including acquisitions, disposals, goodwill and consolidation. Under the new guidance, we expect that the majority of our future operating property acquisitions will be accounted for as asset acquisitions, whereas under the previous guidance our recent acquisitions were accounted for as business combinations; we believe that the primary effect of this change will be that transaction costs associated with future acquisitions will be capitalized rather than expensed as incurred. This guidance had no effect on our consolidated financial statements upon adoption.

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. This guidance also requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We will adopt this guidance for our annual and interim periods beginning January 1, 2018 and expect to use the modified retrospective method, under which the cumulative effect of initially applying the guidance is recognized at the date of initial application. We do not believe that our adoption of this guidance beginning on January 1, 2018 will have a material effect on our consolidated financial statements. However, as discussed further below, once the new guidance setting forth principles for the recognition, measurement, presentation and disclosure of leases goes into effect on January 1, 2019, we believe that the new revenue standard will apply to executory costs and other components of revenue due under leases that are deemed to be non-lease components (such as common area maintenance and provision of utilities), which could affect our recognition pattern for such revenue.

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 of real estate 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 January 1, 2019 using a modified retrospective transition approach at the time of adoption. Early adoption is also permitted for this guidance. In addition, the guidance permits lessees and lessors to elect to apply a package of practical expedients that allow them not to reassess upon adoption: the lease classification for any expired or existing leases; their deferred recognition of incremental direct costs of leasing for any expired or existing leases; and whether any expired or existing contracts are, or contain, leases. While we are still completing our assessment of the impact of this guidance, below is a summary of the anticipated primary effects of this guidance on our accounting and reporting.

• Real estate leases in which we are the lessor:

◦ Balance sheet reporting: We believe that we will apply an approach under the new guidance that is similar to the current accounting for operating leases, in which we will continue to recognize the underlying leased asset as property on our balance sheet.

◦ Deferral of non-incremental lease costs: Under the new lease guidance, we will no longer be able to defer the recognition of non-incremental costs in connection with new or extended tenant leases (refer to amounts reported in our 2016 Annual Report on Form 10-K for amounts deferred in 2014, 2015 and 2016). Upon adoption of the new guidance, we would expense previously deferred non-incremental lease costs for existing leases unless we elect the package of practical expedients, in which case such costs would remain deferred and amortized over the remaining lease terms.

◦ Lease revenue reporting: We believe that the new revenue standard will apply to executory costs and other components of revenue deemed to be non-lease components (such as common area maintenance and provision of utilities), even when the revenue for such activities is not separately stipulated in the lease. In that case, we would need to separate the lease components of revenue due under leases from the non-lease components and the revenue from these items previously recognized on a straight-line basis under current lease guidance would be recognized under the new revenue guidance as the related services are delivered. As a result, while the total revenue recognized over time would not differ under the new guidance, the recognition pattern could be different. We are in the process of evaluating the significance of the difference in the recognition pattern that would result from this change.

• Leases in which we are the lessee:

◦ Our most significant leases as lessee are ground leases we have for certain properties; as of September 30, 2017, our future minimum rental payments under these leases totaled $90.2 million, with various expiration dates extending to the year 2100. While we are still in the process of evaluating these leases under the new guidance, we believe that we will be required to recognize a right-of-use asset and a lease liability for the present value of these minimum lease payments. We also believe that these types of leases most likely would be classified as finance leases under the new guidance, which would result in the interest component of each lease payment being recorded as interest expense and the right-of-use asset being amortized into expense using the straight-line method over the life of the lease; however, if we elect to apply the package of practical expedients, we will continue to account for our existing ground leases as operating leases upon adoption of the guidance.

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 will apply to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans, held-to-maturity debt securities, net investments in leases, and off-balance-sheet credit exposures (e.g. loan commitments). Under the new guidance, an entity will recognize its estimate of expected credit losses as an allowance, as the guidance requires that financial assets be measured on an amortized cost basis and to be presented at the net amount expected to be collected. The guidance is effective for us beginning January 1, 2020, with early adoption 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 areas addressed in the new guidance relate to debt prepayment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned and bank-owned life insurance policies, distributions received from equity method investments, beneficial interest in securitization transactions and separately identifiable cash flows and application of the predominance principle. The guidance is effective for us beginning January 1, 2018, with early adoption permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In November 2016, the FASB issued guidance that requires the statement of cash flows to explain the change during the period in the total of cash, cash equivalents and amounts described as restricted cash or restricted cash equivalents.  Under the new guidance, amounts described as restricted cash and restricted cash equivalents will be included with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows.  The guidance is effective for us beginning January 1, 2018, with early adoption permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In February 2017, the FASB issued guidance clarifying the scope of asset derecognition provisions and accounting for partial sales of nonfinancial assets. The new guidance requires recognition of a sale of real estate and resulting gain or loss when control transfers and the buyer has the ability to direct use of, or obtain substantially all of the remaining benefit from, the asset (which generally will occur on the closing date); the factor of continuing involvement is no longer a specific consideration for the timing of recognition. The new guidance eliminates the need to consider adequacy of buyer investment, which was replaced by additional judgments regarding collectability and intent and/or ability to pay. The new guidance also requires an entity to derecognize nonfinancial assets and in substance non financial assets once it transfers control of such assets. When an entity transfers its controlling interest in a nonfinancial asset, but retains a noncontrolling ownership interest, the entity is required to measure any non-controlling interest it receives or retains at fair value and recognize a full gain or loss on the transaction; as a result, sales and partial sales of real estate assets will now be subject to the same derecognition model as all other nonfinancial assets. As discussed further in our 2016 Annual Report on Form 10-K, we had a transaction in July 2016 accounted for as a partial sale under existing guidance that would meet the criteria for immediate full gain recognition under the new guidance; this would result in an additional $18 million in income being recognized in 2016 that is currently being amortized into income in subsequent periods under existing guidance. We do not believe that the recognition pattern for our other sales of real estate will be changed by the new guidance. We will adopt this guidance for our annual and interim periods beginning January 1, 2018 and expect to use the the full retrospective method, under which we would retrospectively restate each reporting period presented at the time of adoption.

In August 2017, the FASB issued guidance that makes targeted improvements to hedge accounting. This new guidance simplifies the application of hedge accounting and better aligns financial reporting for hedging activities with companies’ economic objectives in undertaking those activities. Under the new guidance, all changes in the fair value of highly effective cash flow hedges will be recorded in other comprehensive income instead of income. The new guidance also eases the administrative burden of hedge documentation requirements and assessing hedge effectiveness. The guidance is effective for us beginning January 1, 2019, with early adoption permitted. We are currently evaluating the impact of this guidance, including transition elections and required disclosures, on our financial statements and the timing of adoption.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2017

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

Recurring Fair Value Measurements

COPT has a non-qualified elective deferred compensation plan for Trustees and 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 $4.4 million as of September 30, 2017, 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, 2017, 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, 2017 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	$	4,336	$	—	$	—	$	4,336
Other	71		—		—		71
Interest rate derivatives (2)	—		126		—		126
Total assets	$	4,407	$	126	$	—	$	4,533
Liabilities:
Deferred compensation plan liability (3)	$	—	$	4,407	$	—	$	4,407
Interest rate derivatives (3)	—		316		—		316
Total liabilities	$	—	$	4,723	$	—	$	4,723

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

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

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

COPLP and Subsidiaries

The 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, 2017 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:
Interest rate derivatives (1)	$	—	$	126	$	—	$	126
Liabilities:
Interest rate derivatives (2)	$	—	$	316	$	—	$	316

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

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

Nonrecurring Fair Value Measurements

As part of our closing process for the first, second and third quarters of 2017, we conducted our quarterly review of our portfolio of long-lived assets to be held and used for indicators of impairment and found there to be no impairment losses. Further, for the respective quarters in 2017, we performed recoverability analyses for our properties classified as held for sale, which resulted in impairment losses of $1.6 million in the second quarter of 2017. These impairment losses were primarily on properties in White Marsh, Maryland (“White Marsh”) (included in our Regional Office and Other segments) that we reclassified to held for sale during the period and adjusted to fair value less costs to sell. These properties were sold in the third quarter.

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 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 impairment losses.

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Properties, Net

9 Months Ended

Sep. 30, 2017

Real Estate [Abstract]

Properties, Net

Properties, Net

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

	September 30, 2017			December 31, 2016
Land	$	440,771		$	433,311
Buildings and improvements	3,009,203			2,944,905
Less: Accumulated depreciation	(759,262		)	(706,385		)
Operating properties, net	$	2,690,712		$	2,671,831

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

	September 30, 2017		December 31, 2016
Land	$	216,108	$	195,521
Development in progress, excluding land	190,211		206,010
Projects in development or held for future development	$	406,319	$	401,531

Our properties held for sale included:

• as of September 30, 2017: two operating properties in our Data Center Shells sub-segment and one in our Fort Meade/BW Corridor sub-segment; and

• as of December 31, 2016: eight operating properties in White Marsh (included primarily in our Regional Office segment); one operating property in our Northern Virginia Defense/IT sub-segment; and land in White Marsh and Northern Virginia.

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

	September 30, 2017		December 31, 2016
Properties, net	$	68,081	$	85,402
Deferred rent receivable	5,582		4,241
Intangible assets on real estate acquisitions, net	—		338
Deferred leasing costs, net	742		3,636
Lease incentives, net	10		1,037
Assets held for sale, net	$	74,415	$	94,654

2017 Dispositions

During the nine months endedSeptember 30, 2017, we sold the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Sale	Number of Buildings	Total Rentable Square Feet	Transaction Value		Gain on Sale
3120 Fairview Park Drive	Falls Church, VA	Northern Virginia Defense/IT	2/15/2017	1	190,000	$	39,000	$	—
1334 Ashton Road	Hanover, MD	Fort Meade/BW Corridor	6/9/2017	1	37,000	2,300		—
Remaining White Marsh Properties (1)	White Marsh, MD	Regional Office and Other	7/28/2017	8	412,000	47,500		1,180
Dispositions through 9/30/2017				10	639,000	$	88,800	$	1,180

(1) This sale also included land.

We also sold other land in the nine months ended September 30, 2017 for $14.3 million and recognized a gain on sale of $4.2 million.

On October 27, 2017, we sold:

• 201 Technology Drive, an operating property totaling 103,000 square feet in Lebanon, Virginia (in our Data Center Shells sub-segment), for $29.2 million; and

• 11751 Meadowville Lane, an operating property totaling 193,000 square feet in Chester, Virginia (in our Data Center Shells sub-segment), for $44.3 million. We provided a financial guaranty to the buyer under which we would indemnify it for up to $20 million in losses it could incur related to a potential defined capital event occurring on the property by June 30, 2019. Accordingly, we will not recognize the sale of this property for accounting purposes, and will reflect the sale price of the property as a liability, until the guaranty expires. We do not expect to incur any losses under this financial guaranty.

2017 Construction Activities

During the nine months endedSeptember 30, 2017, we placed into service 751,000 square feet in five newly constructed properties (including a partially operational property) and 88,000 square feet in three redeveloped properties (including a partially operational property). As of September 30, 2017, we had eight 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 two office properties under redevelopment that we estimate will total 36,000 square feet upon completion.

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Real Estate Joint Ventures

9 Months Ended

Sep. 30, 2017

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, 2017 (dollars in thousands):

		Nominal
		Ownership		September 30, 2017 (1)
	Date	% as of		Total		Encumbered		Total
	Acquired	9/30/2017	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	158,937	$	76,374	$	50,344
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	70,767		45,813		46,895
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	70,383		—		23,566
				$	300,087	$	122,187	$	120,805

(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. Our partner in this joint venture received an additional distribution from the joint venture of $6.7 million in July 2017 that was reported in other liabilities on our consolidated balance sheet as of December 31, 2016.

Unconsolidated Joint Venture

As of September 30, 2017, we owned a 50% interest in GI-COPT DC Partnership LLC (“GI-COPT”), a joint venture owning six triple-net leased, single-tenant data center properties in Virginia, that we account for using the equity method of accounting. As of September 30, 2017, we had an investment balance in GI-COPT of $25.2 million. Our balance was $17.1 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.

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Investing Receivables

9 Months Ended

Sep. 30, 2017

Receivables [Abstract]

Investing Receivables

Investing Receivables

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

	September 30, 2017		December 31, 2016
Notes receivable from the City of Huntsville	$	53,088	$	49,258
Other investing loans receivable	3,020		3,021
	$	56,108	$	52,279

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, 2017 or December 31, 2016.  The fair value of these receivables approximated their carrying amounts as of September 30, 2017 and December 31, 2016.

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Prepaid Expenses and Other Assets, Net

9 Months Ended

Sep. 30, 2017

Prepaid Expense and Other Assets [Abstract]

Prepaid Expenses and Other Assets, Net

Prepaid Expenses and Other Assets, Net

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

	September 30, 2017		December 31, 2016
Prepaid expenses	$	30,932	$	24,432
Lease incentives, net	17,202		18,276
Furniture, fixtures and equipment, net	5,422		5,204
Deferred tax asset, net (1)	2,851		3,036
Non-real estate equity method investments	2,413		2,355
Construction contract costs incurred in excess of billings	2,005		10,350
Deferred financing costs, net (2)	1,419		3,128
Other assets	4,294		5,983
Prepaid expenses and other assets, net	$	66,538	$	72,764

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

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

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Debt, Net

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Debt, Net

Debt, Net

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

	Carrying Value (1) as of
	September 30, 2017		December 31, 2016		Stated Interest Rates as of	Scheduled Maturity as of
					September 30, 2017	September 30, 2017
Mortgage and Other Secured Debt:
Fixed rate mortgage debt (2)	$	151,594	$	154,143	3.82% - 7.87% (3)	2019-2026
Variable rate secured debt	13,200		13,448		LIBOR + 1.85% (4)	October 2020
Total mortgage and other secured debt	164,794		167,591
Revolving Credit Facility	170,000		—		LIBOR + 0.875% to 1.60% (5)	May 2019 (6)
Term Loan Facilities (7)	348,371		547,494		LIBOR + 0.90% to 2.40% (8)	2020-2022
Unsecured Senior Notes
3.600%, $350,000 aggregate principal	347,445		347,128		3.60% (9)	May 2023
5.250%, $250,000 aggregate principal	246,525		246,176		5.25% (10)	February 2024
3.700%, $300,000 aggregate principal	298,200		297,843		3.70% (11)	June 2021
5.000%, $300,000 aggregate principal	296,639		296,368		5.00% (12)	July 2025
Unsecured notes payable	1,317		1,401		0% (13)	2026
Total debt, net	$	1,873,291	$	1,904,001

(1) The carrying values of our debt other than the Revolving Credit Facility reflect net deferred financing costs of $4.8 million as of September 30, 2017 and $6.1 million as of December 31, 2016.

(2)   Certain 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 $367,000 as of September 30, 2017 and $422,000 as of December 31, 2016.

(3) The weighted average interest rate on our fixed rate mortgage debt was 4.19% as of September 30, 2017.

(4)  The interest rate on our variable rate secured debt as of September 30, 2017 was 3.09%.

(5) The weighted average interest rate on the Revolving Credit Facility was 2.40% as of September 30, 2017.

(6) The facility matures in May 2019, with the ability for us to further extend such maturity by twosix-month periods at our option, provided that there is no default under the facility and we pay an extension fee of 0.075% of the total availability under the facility for each extension period.

(7)   As of September 30, 2017, we have the ability to borrow an additional $350.0 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 May 1, 2017, we repaid $200.0 million of the loan balance on a term loan scheduled to mature in 2020.

(8)  The weighted average interest rate on these loans was 2.93% as of September 30, 2017.

(9) The carrying value of these notes reflects an unamortized discount totaling $1.8 millionas of September 30, 2017 and $2.0 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%. 

(10) The carrying value of these notes reflectsan unamortized discount totaling $3.1 millionas of September 30, 2017 and $3.4 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%. 

(11) The carrying value of these notes reflects an unamortized discount totaling $1.4 millionas of September 30, 2017 and $1.7 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.85%. 

(12) The carrying value of these notes reflects an unamortized discount totaling $2.8 millionas of September 30, 2017 and $3.0 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

(13)  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 $394,000 as of September 30, 2017 and $460,000 as of December 31, 2016.

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, 2017, we were compliant with these covenants.

We capitalized interest costs of $1.1 million in the three months ended September 30, 2017, $1.2 million in the three months ended September 30, 2016, $4.2 million in the nine months ended September 30, 2017 and $4.3 million in the nine months ended September 30, 2016.

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

	September 30, 2017				December 31, 2016
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Fixed-rate debt
Unsecured Senior Notes	$	1,188,809	$	1,231,222	$	1,187,515	$	1,220,282
Other fixed-rate debt	152,911		154,781		155,544		156,887
Variable-rate debt	531,571		531,520		560,942		558,437
	$	1,873,291	$	1,917,523	$	1,904,001	$	1,935,606

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Interest Rate Derivatives

9 Months Ended

Sep. 30, 2017

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, each of which was designated as a cash flow hedge of interest rate risk (dollars in thousands):

							Fair Value at
Notional Amount			Fixed Rate	Floating Rate Index	Effective Date	Expiration Date	September 30, 2017			December 31, 2016
$	100,000		1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	$	(237	)	$	(848	)
13,311		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	126			100
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	(27		)	(23		)
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	(22		)	48
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	(30		)	10
100,000		(2)	1.6730%	One-Month LIBOR	9/1/2015	8/1/2019	—			(701		)
							$	(190	)	$	(1,414	)

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

(2) We cash settled this derivative and interest accrued thereon for $460,000 on May 1, 2017. Since the hedged transactions associated with this derivative were still probable to occur as of the settlement date, amounts in accumulated other comprehensive loss (“AOCL”) associated with this derivative will be reclassified to interest expense through August 2019.

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, 2017			December 31, 2016
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets	$	126		$	158
Interest rate swaps designated as cash flow hedges	Other liabilities	(316		)	(1,572		)

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,
	2017			2016			2017			2016
Unrealized (loss) gain recognized in AOCL (effective portion)	$	(301	)	$	407		$	(1,877	)	$	(16,581	)
Loss reclassified from AOCL into interest expense (effective portion)	(615		)	(1,043		)	(2,652		)	(2,763		)
Gain (loss) on derivatives recognized in interest expense (ineffective portion)	34			1,523			132			(347		)
Loss reclassified from AOCL into interest expense (ineffective portion) (1)	—			—			(88		)	—

(1) Represents a loss recognized on certain interest rate swaps from the accelerated reclassification of amounts in AOCL on May 1, 2017, when we concluded that hedged forecasted transactions were probable not to occur.

Over the next 12 months, we estimate that approximately $1.6 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. 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, 2017, the fair value of interest rate derivatives in a liability position related to these agreements was $305,000, excluding the effects of accrued interest and credit valuation adjustments. As of September 30, 2017, 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 $484,000.

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Redeemable Noncontrolling Interests

9 Months Ended

Sep. 30, 2017

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,
	2017			2016
Beginning balance	$	22,979		$	19,218
Contributions from noncontrolling interests	—			22,779
Distributions to noncontrolling interests	(1,186		)	(21,344		)
Net income attributable to noncontrolling interests	1,720			1,679
Adjustment to arrive at fair value of interests	(244		)	516
Ending balance	$	23,269		$	22,848

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Equity

9 Months Ended

Sep. 30, 2017

Equity [Abstract]

Equity

Equity

During the nine months endedSeptember 30, 2017, COPT redeemed all of the outstanding shares of its following series of preferred shares:

• the 5.600% Series K Cumulative Redeemable Preferred Shares (the “Series K Preferred Shares”), redeemed effective January 21, 2017 at a price of $50.00 per share, or $26.6 million in the aggregate, plus accrued and unpaid dividends thereon through the date of redemption. Concurrently with this redemption, COPLP redeemed its Series K Preferred Units on the same terms. Since we made an irrevocable notification to holders of the Series K Preferred Shares in December 2016 of our intention to redeem such shares, we presented the liquidation preference of the shares/units as a liability on the consolidated balance sheets of COPT and COPLP as of December 31, 2016; we also recognized a $17,000 decrease to net income available to common shareholders/unitholders in the three months ended December 31, 2016 pertaining to the original issuance costs incurred on the shares/units; and

• the 7.375% Series L Cumulative Preferred Shares (the “Series L Preferred Shares”), redeemed effective June 27, 2017 at a price of $25.00 per share, or $172.5 million in the aggregate, plus accrued and unpaid dividends thereon up to but not including the date of redemption. Concurrently with this redemption, COPLP redeemed its Series L Preferred Units on the same terms. We also recognized a $6.8 million decrease to net income available to common shareholders/unitholders in the nine months ended September 30, 2017 pertaining to the original issuance costs incurred on the shares/units.

During the nine months endedSeptember 30, 2017, COPT issued 591,042 common shares at a weighted average price of $33.84 per share under its existing at-the-market (“ATM”) stock offering program. Net proceeds from the shares issued totaled $19.7 million, after payment of $300,000 in commissions to sales agents. COPT contributed the net proceeds from these issuances to COPLP in exchange for an equal number of units in COPLP. COPT’s remaining capacity under this ATM program is an aggregate gross sales price of $70.0 million in common share sales.

During the nine months endedSeptember 30, 2017, certain COPLP limited partners converted 337,000 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, 2017

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). 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; 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”). 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, 2017
Revenues from real estate operations	$	61,254		$	12,190		$	11,024		$	7,494		$	3,532		$	6,676		$	102,170		$	16,656		$	7,398		$	1,007		$	127,231
Property operating expenses	(19,708		)	(4,343		)	(6,193		)	(3,157		)	(1,432		)	(637		)	(35,470		)	(7,406		)	(3,175		)	(317		)	(46,368		)
UJV NOI allocable to COPT	—			—			—			—			—			1,297			1,297			—			—			—			1,297
NOI from real estate operations	$	41,546		$	7,847		$	4,831		$	4,337		$	2,100		$	7,336		$	67,997		$	9,250		$	4,223		$	690		$	82,160
Additions to long-lived assets	$	5,810		$	2,587		$	55		$	1,910		$	843		$	—		$	11,205		$	5,338		$	9		$	76		$	16,628
Transfers from non-operating properties	$	5,519		$	45,554		$	—		$	8		$	(62	)	$	29,803		$	80,822		$	25		$	—		$	—		$	80,847
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
Nine Months Ended September 30, 2017
Revenues from real estate operations	$	183,393		$	34,992		$	35,687		$	21,953		$	10,616		$	17,998		$	304,639		$	52,394		$	21,201		$	4,061		$	382,295
Property operating expenses	(60,357		)	(13,014		)	(21,125		)	(9,391		)	(4,294		)	(1,873		)	(110,054		)	(21,974		)	(10,041		)	(1,446		)	(143,515		)
UJV NOI allocable to COPT	—			—			—			—			—			3,889			3,889			—			—			—			3,889
NOI from real estate operations	$	123,036		$	21,978		$	14,562		$	12,562		$	6,322		$	20,014		$	198,474		$	30,420		$	11,160		$	2,615		$	242,669
Additions to long-lived assets	$	15,085		$	6,032		$	71		$	6,309		$	1,059		$	—		$	28,556		$	16,476		$	3,588		$	203		$	48,823
Transfers from non-operating properties	$	37,094		$	45,994		$	—		$	474		$	1,643		$	55,003		$	140,208		$	—		$	8		$	18		$	140,234
Segment assets at September 30, 2017	$	1,265,569		$	400,855		$	129,657		$	194,801		$	108,884		$	258,611		$	2,358,377		$	398,579		$	226,909		$	13,347		$	2,997,212
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

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,
	2017		2016		2017		2016
Segment revenues from real estate operations	$	127,231	$	130,954	$	382,295	$	397,965
Construction contract and other service revenues	29,786		11,149		65,958		34,372
Total revenues	$	157,017	$	142,103	$	448,253	$	432,337

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,
	2017			2016			2017			2016
UJV NOI allocable to COPT	$	1,297		$	1,008		$	3,889		$	1,008
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(577		)	(415		)	(1,724		)	(415		)
Add: Equity in (loss) income of unconsolidated non-real estate entities	(1		)	1			(3		)	21
Equity in income of unconsolidated entities	$	719		$	594		$	2,162		$	614

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,
	2017			2016			2017			2016
Construction contract and other service revenues	$	29,786		$	11,149		$	65,958		$	34,372
Construction contract and other service expenses	(28,788		)	(10,341		)	(63,589		)	(32,513		)
NOI from service operations	$	998		$	808		$	2,369		$	1,859

The following table reconciles our NOI from real estate operations for reportable segments and NOI from service operations to income from before gain on sales of real estate as reported on our consolidated statements of operations (in thousands):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
NOI from real estate operations	$	82,160		$	82,010		$	242,669		$	249,005
NOI from service operations	998			808			2,369			1,859
Interest and other income	1,508			1,391			4,817			3,877
Equity in income of unconsolidated entities	719			594			2,162			614
Income tax (expense) benefit	(57		)	21			(145		)	28
Depreciation and other amortization associated with real estate operations	(34,438		)	(32,015		)	(100,290		)	(99,790		)
Impairment recoveries (losses)	161			(27,699		)	(1,464		)	(99,837		)
General, administrative and leasing expenses	(7,368		)	(8,855		)	(23,838		)	(28,764		)
Business development expenses and land carry costs	(1,277		)	(1,716		)	(4,567		)	(6,497		)
Interest expense	(19,615		)	(18,301		)	(57,772		)	(64,499		)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,297		)	(1,008		)	(3,889		)	(1,008		)
Loss on early extinguishment of debt	—			(59		)	(513		)	(37		)
Income (loss) before gain on sales of real estate	$	21,494		$	(4,829	)	$	59,539		$	(45,049	)

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

	September 30, 2017		September 30, 2016
Segment assets	$	2,997,212	$	3,027,125
Non-operating property assets	413,255		421,364
Other assets	149,305		185,705
Total COPT consolidated assets	$	3,559,772	$	3,634,194

The accounting policies of the segments are the same as those used to prepare our consolidated financial statements, except that discontinued operations and UJV NOI allocable to COPT are not presented separately for segment purposes.  In the segment reporting presented above, we did not allocate interest expense, depreciation and amortization, impairment (recoveries) losses, loss 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, 2017

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

Share-Based Compensation and Other Compensation Matters

Share-Based Compensation and Other Compensation Matters

Performance-Based Share Units (“PSUs”)

On January 1, 2017, our Board of Trustees granted 36,525 PSUs with an aggregate grant date fair value of $1.4 million to our three executives (the “January Grants”).  The PSUs have a performance period beginning on January 1, 2017 and concluding on the earlier of December 31, 2019 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.

On August 23, 2017, the January Grants were modified to include a provision that limits the earned PSUs payout percentage to 100% of the PSUs granted if COPT’s total shareholder return is negative during the performance period irrespective of its percentile rank in the peer group (the “Negative TSR Modifier”). In addition, as a result of the modification to the January Grants, on August 23, 2017, we augmented the January Grants by issuing an aggregate of 2,826 additional PSUs to the executives. Each of the PSU Certificates also includes the Negative TSR Modifier. The incremental award to the executives on August 23, 2017 resulting from these modifications totaled $12,000.

For the January Grants, we computed a grant date fair value of $38.43 per PSU using a Monte Carlo model, which included assumptions of, among other things, the following: baseline common share value of $31.22; expected volatility for COPT common shares of 19.0%; and a risk-free interest rate of 1.47%. For the award modification on August 23, 2017, we computed a pre-modification fair value of $49.66 per PSU and a post-modification fair value of $46.39 per PSU using a Monte Carlo model, which included assumptions of, among other things, the following: baseline common share value of $33.40; expected volatility for COPT common shares of 18.7%; and a risk-free interest rate of 1.36%. 

We issued 9,763 common shares on February 7, 2017 to Mr. Stephen E. Budorick, our Chief Executive Officer, in settlement of PSUs issued in 2014, representing 100% of the target award for those PSUs.

Restricted Shares

During the nine months endedSeptember 30, 2017, certain employees and non-employee members of our Board of Trustees were granted a total of 230,635 restricted common shares with an aggregate grant date fair value of $7.8 million (weighted average of $33.96 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.  Restricted shares granted to non-employee Trustees vest on the first anniversary of the grant date, provided that the Trustee remains in his or her position. During the nine months endedSeptember 30, 2017, forfeiture restrictions lapsed on 148,401 previously issued common shares; these shares had a weighted average grant date fair value of $26.18 per share, and the aggregate intrinsic value of the shares on the vesting dates was $5.0 million.

Deferred Share Awards

During the nine months endedSeptember 30, 2017, nonemployee members of our Board of Trustees were granted a total of 10,032 deferred share awards with an aggregate grant date fair value of $326,000 ($32.47 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, 2017, we issued 15,590 common shares in settlement of deferred share awards granted in 2016; these shares had a grant date fair value of $26.89 per share, and the aggregate intrinsic value of the shares on the settlement date was $508,000.

Options

During the nine months endedSeptember 30, 2017, 5,000 options to purchase common shares (“options”) were exercised.  The weighted average exercise price of these options was $29.98 per share, and the aggregate intrinsic value of the options exercised was $18,000.

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

9 Months Ended

Sep. 30, 2017

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,
	2017			2016			2017			2016
Numerator:
Net income (loss) attributable to COPT	$	20,916		$	27,299		$	60,133		$	(13,294	)
Preferred share dividends	—			(3,552		)	(6,219		)	(10,657		)
Issuance costs associated with redeemed preferred shares	—			—			(6,847		)	—
Income attributable to share-based compensation awards	(95		)	(105		)	(337		)	(319		)
Numerator for basic and diluted EPS on net income (loss) attributable to COPT common shareholders	$	20,821		$	23,642		$	46,730		$	(24,270	)
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	99,112			94,433			98,855			94,312
Dilutive effect of share-based compensation awards	146			81			154			—
Denominator for diluted EPS (common shares)	99,258			94,514			99,009			94,312
Basic EPS:
Net income (loss) attributable to COPT common shareholders	$	0.21		$	0.25		$	0.47		$	(0.26	)
Diluted EPS:
Net income (loss) attributable to COPT common shareholders	$	0.21		$	0.25		$	0.47		$	(0.26	)

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,
	2017	2016	2017	2016
Conversion of common units	3,350	3,591	3,400	3,648
Conversion of Series I Preferred Units	176	176	176	176
Conversion of Series K Preferred Shares	—	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, 2017 and 2016 of 445,000 and 375,000, respectively, and for the nine months endedSeptember 30, 2017 and 2016 of 431,000 and 394,000, respectively; and

• weighted average options for the three months ended September 30, 2017 and 2016 of 40,000 and 233,000, respectively, and for the nine months endedSeptember 30, 2017 and 2016 of 80,000 and 307,000, respectively.

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,
	2017			2016			2017			2016
Numerator:
Net income (loss) attributable to COPLP common unitholders	$	21,785		$	28,359		$	62,239		$	(13,751	)
Preferred unit distributions	(165		)	(3,717		)	(6,714		)	(11,152		)
Issuance costs associated with redeemed preferred units	—			—			(6,847		)	—
Income attributable to share-based compensation awards	(95		)	(105		)	(337		)	(319		)
Numerator for basic and diluted EPU on net income (loss) attributable to COPLP common unitholders	$	21,525		$	24,537		$	48,341		$	(25,222	)
Denominator (all weighted averages):
Denominator for basic EPU (common units)	102,462			98,024			102,255			97,960
Dilutive effect of share-based compensation awards	146			81			154			—
Denominator for diluted EPU (common units)	102,608			98,105			102,409			97,960
Basic EPU:
Net income (loss) attributable to COPLP common unitholders	$	0.21		$	0.25		$	0.47		$	(0.26	)
Diluted EPU:
Net income (loss) attributable to COPLP common unitholders	$	0.21		$	0.25		$	0.47		$	(0.26	)

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,
	2017	2016	2017	2016
Conversion of Series I preferred units	176	176	176	176
Conversion of Series K preferred units	—	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, 2017 and 2016 of 445,000 and 375,000, respectively, and for the nine months endedSeptember 30, 2017 and 2016 of 431,000 and 394,000, respectively; and

• weighted average options for the three months ended September 30, 2017 and 2016 of 40,000 and 233,000, respectively, and for the nine months endedSeptember 30, 2017 and 2016 of 80,000 and 307,000, respectively.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2017

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 $685,000 liability through September 30, 2017 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, 2017 follow (in thousands):

Year Ending December 31,
2017 (1)	$	320
2018	1,275
2019	1,263
2020	1,257
2021	1,260
Thereafter	85,761
	$	91,136

(1) Represents the three months ending December 31, 2017.

Capital Lease

On May 25, 2017, we entered into a ground lease on land under development in Washington, D.C. for our Stevens Investors, LLC joint venture. The lease has a 99-year term, and we possess an option to purchase the property for one dollar (estimated to occur between 2019 and 2020). Upon inception of the lease, we recorded a $16.1 million capital lease liability on our consolidated balance sheets based on the present value of the future minimum rental payments. Future minimum rental payments due under the term of this lease as of September 30, 2017 follow (in thousands):

Year Ending December 31,
2017 (1)	$	700
2018	15,775
2020	135
Thereafter	75
Total minimum rental payments	$	16,685
Less: Amount representing interest	(338		)
Capital lease obligation	$	16,347

(1) Represents the three months ending December 31, 2017.

Contractual Obligations

We had amounts remaining to be incurred under various contractual obligations as of September 30, 2017 that included the following (excluding amounts incurred and therefore reflected as liabilities reported on our consolidated balance sheet):

• new development and redevelopment obligations of $35.1 million;

• capital expenditures for operating properties of $45.8 million;

• third party construction and development of $67.4 million; and

• other obligations of $1.1 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, 2017

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, 2016 included in our 2016 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 2016 Annual Report on Form 10-K.

Reclassification

Reclassification

We reclassified certain amounts from prior periods to conform to the current period presentation of our consolidated financial statements with no effect on previously reported net income or equity.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) effective January 1, 2017 intended to simplify various aspects related to the accounting and presentation for employee 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. In connection with our adoption of this policy, we made an entity-wide accounting policy election to continue to account for potential future award forfeitures by estimating the number of awards that are expected to vest. Our adoption of this guidance did not have a material impact on our consolidated financial statements.

We adopted guidance issued by the FASB prospectively effective January 1, 2017 that clarifies the definition of a business used by entities in determining whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The definition of a business affects many areas of accounting including acquisitions, disposals, goodwill and consolidation. Under the new guidance, we expect that the majority of our future operating property acquisitions will be accounted for as asset acquisitions, whereas under the previous guidance our recent acquisitions were accounted for as business combinations; we believe that the primary effect of this change will be that transaction costs associated with future acquisitions will be capitalized rather than expensed as incurred. This guidance had no effect on our consolidated financial statements upon adoption.

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. This guidance also requires improved disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers. We will adopt this guidance for our annual and interim periods beginning January 1, 2018 and expect to use the modified retrospective method, under which the cumulative effect of initially applying the guidance is recognized at the date of initial application. We do not believe that our adoption of this guidance beginning on January 1, 2018 will have a material effect on our consolidated financial statements. However, as discussed further below, once the new guidance setting forth principles for the recognition, measurement, presentation and disclosure of leases goes into effect on January 1, 2019, we believe that the new revenue standard will apply to executory costs and other components of revenue due under leases that are deemed to be non-lease components (such as common area maintenance and provision of utilities), which could affect our recognition pattern for such revenue.

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 of real estate 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 January 1, 2019 using a modified retrospective transition approach at the time of adoption. Early adoption is also permitted for this guidance. In addition, the guidance permits lessees and lessors to elect to apply a package of practical expedients that allow them not to reassess upon adoption: the lease classification for any expired or existing leases; their deferred recognition of incremental direct costs of leasing for any expired or existing leases; and whether any expired or existing contracts are, or contain, leases. While we are still completing our assessment of the impact of this guidance, below is a summary of the anticipated primary effects of this guidance on our accounting and reporting.

• Real estate leases in which we are the lessor:

◦ Balance sheet reporting: We believe that we will apply an approach under the new guidance that is similar to the current accounting for operating leases, in which we will continue to recognize the underlying leased asset as property on our balance sheet.

◦ Deferral of non-incremental lease costs: Under the new lease guidance, we will no longer be able to defer the recognition of non-incremental costs in connection with new or extended tenant leases (refer to amounts reported in our 2016 Annual Report on Form 10-K for amounts deferred in 2014, 2015 and 2016). Upon adoption of the new guidance, we would expense previously deferred non-incremental lease costs for existing leases unless we elect the package of practical expedients, in which case such costs would remain deferred and amortized over the remaining lease terms.

◦ Lease revenue reporting: We believe that the new revenue standard will apply to executory costs and other components of revenue deemed to be non-lease components (such as common area maintenance and provision of utilities), even when the revenue for such activities is not separately stipulated in the lease. In that case, we would need to separate the lease components of revenue due under leases from the non-lease components and the revenue from these items previously recognized on a straight-line basis under current lease guidance would be recognized under the new revenue guidance as the related services are delivered. As a result, while the total revenue recognized over time would not differ under the new guidance, the recognition pattern could be different. We are in the process of evaluating the significance of the difference in the recognition pattern that would result from this change.

• Leases in which we are the lessee:

◦ Our most significant leases as lessee are ground leases we have for certain properties; as of September 30, 2017, our future minimum rental payments under these leases totaled $90.2 million, with various expiration dates extending to the year 2100. While we are still in the process of evaluating these leases under the new guidance, we believe that we will be required to recognize a right-of-use asset and a lease liability for the present value of these minimum lease payments. We also believe that these types of leases most likely would be classified as finance leases under the new guidance, which would result in the interest component of each lease payment being recorded as interest expense and the right-of-use asset being amortized into expense using the straight-line method over the life of the lease; however, if we elect to apply the package of practical expedients, we will continue to account for our existing ground leases as operating leases upon adoption of the guidance.

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 will apply to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans, held-to-maturity debt securities, net investments in leases, and off-balance-sheet credit exposures (e.g. loan commitments). Under the new guidance, an entity will recognize its estimate of expected credit losses as an allowance, as the guidance requires that financial assets be measured on an amortized cost basis and to be presented at the net amount expected to be collected. The guidance is effective for us beginning January 1, 2020, with early adoption 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 areas addressed in the new guidance relate to debt prepayment costs, settlement of zero-coupon debt instruments, contingent consideration payments made after a business combination, proceeds from the settlement of insurance claims, proceeds from the settlement of corporate-owned and bank-owned life insurance policies, distributions received from equity method investments, beneficial interest in securitization transactions and separately identifiable cash flows and application of the predominance principle. The guidance is effective for us beginning January 1, 2018, with early adoption permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In November 2016, the FASB issued guidance that requires the statement of cash flows to explain the change during the period in the total of cash, cash equivalents and amounts described as restricted cash or restricted cash equivalents.  Under the new guidance, amounts described as restricted cash and restricted cash equivalents will be included with cash and cash equivalents when reconciling the beginning of period and end of period total amounts shown on the statement of cash flows.  The guidance is effective for us beginning January 1, 2018, with early adoption permitted. We do not expect the adoption of this guidance to have a material impact on our consolidated financial statements.

In February 2017, the FASB issued guidance clarifying the scope of asset derecognition provisions and accounting for partial sales of nonfinancial assets. The new guidance requires recognition of a sale of real estate and resulting gain or loss when control transfers and the buyer has the ability to direct use of, or obtain substantially all of the remaining benefit from, the asset (which generally will occur on the closing date); the factor of continuing involvement is no longer a specific consideration for the timing of recognition. The new guidance eliminates the need to consider adequacy of buyer investment, which was replaced by additional judgments regarding collectability and intent and/or ability to pay. The new guidance also requires an entity to derecognize nonfinancial assets and in substance non financial assets once it transfers control of such assets. When an entity transfers its controlling interest in a nonfinancial asset, but retains a noncontrolling ownership interest, the entity is required to measure any non-controlling interest it receives or retains at fair value and recognize a full gain or loss on the transaction; as a result, sales and partial sales of real estate assets will now be subject to the same derecognition model as all other nonfinancial assets. As discussed further in our 2016 Annual Report on Form 10-K, we had a transaction in July 2016 accounted for as a partial sale under existing guidance that would meet the criteria for immediate full gain recognition under the new guidance; this would result in an additional $18 million in income being recognized in 2016 that is currently being amortized into income in subsequent periods under existing guidance. We do not believe that the recognition pattern for our other sales of real estate will be changed by the new guidance. We will adopt this guidance for our annual and interim periods beginning January 1, 2018 and expect to use the the full retrospective method, under which we would retrospectively restate each reporting period presented at the time of adoption.

In August 2017, the FASB issued guidance that makes targeted improvements to hedge accounting. This new guidance simplifies the application of hedge accounting and better aligns financial reporting for hedging activities with companies’ economic objectives in undertaking those activities. Under the new guidance, all changes in the fair value of highly effective cash flow hedges will be recorded in other comprehensive income instead of income. The new guidance also eases the administrative burden of hedge documentation requirements and assessing hedge effectiveness. The guidance is effective for us beginning January 1, 2019, with early adoption permitted. We are currently evaluating the impact of this guidance, including transition elections and required disclosures, on our financial statements and the timing of adoption.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017 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:
Interest rate derivatives (1)	$	—	$	126	$	—	$	126
Liabilities:
Interest rate derivatives (2)	$	—	$	316	$	—	$	316

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

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

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, 2017 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	$	4,336	$	—	$	—	$	4,336
Other	71		—		—		71
Interest rate derivatives (2)	—		126		—		126
Total assets	$	4,407	$	126	$	—	$	4,533
Liabilities:
Deferred compensation plan liability (3)	$	—	$	4,407	$	—	$	4,407
Interest rate derivatives (3)	—		316		—		316
Total liabilities	$	—	$	4,723	$	—	$	4,723

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

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

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

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Properties, Net (Tables)

9 Months Ended

Sep. 30, 2017

Real Estate [Abstract]

Schedule of operating properties, net

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

	September 30, 2017			December 31, 2016
Land	$	440,771		$	433,311
Buildings and improvements	3,009,203			2,944,905
Less: Accumulated depreciation	(759,262		)	(706,385		)
Operating properties, net	$	2,690,712		$	2,671,831

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, 2017		December 31, 2016
Land	$	216,108	$	195,521
Development in progress, excluding land	190,211		206,010
Projects in development or held for future development	$	406,319	$	401,531

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, 2017		December 31, 2016
Properties, net	$	68,081	$	85,402
Deferred rent receivable	5,582		4,241
Intangible assets on real estate acquisitions, net	—		338
Deferred leasing costs, net	742		3,636
Lease incentives, net	10		1,037
Assets held for sale, net	$	74,415	$	94,654

Schedule of operating property dispositions

During the nine months endedSeptember 30, 2017, we sold the following operating properties (dollars in thousands):

Project Name	City, State	Segment	Date of Sale	Number of Buildings	Total Rentable Square Feet	Transaction Value		Gain on Sale
3120 Fairview Park Drive	Falls Church, VA	Northern Virginia Defense/IT	2/15/2017	1	190,000	$	39,000	$	—
1334 Ashton Road	Hanover, MD	Fort Meade/BW Corridor	6/9/2017	1	37,000	2,300		—
Remaining White Marsh Properties (1)	White Marsh, MD	Regional Office and Other	7/28/2017	8	412,000	47,500		1,180
Dispositions through 9/30/2017				10	639,000	$	88,800	$	1,180

(1) This sale also included land.

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Real Estate Joint Ventures (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017 (dollars in thousands):

		Nominal
		Ownership		September 30, 2017 (1)
	Date	% as of		Total		Encumbered		Total
	Acquired	9/30/2017	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	158,937	$	76,374	$	50,344
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	70,767		45,813		46,895
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	70,383		—		23,566
				$	300,087	$	122,187	$	120,805

(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. Our partner in this joint venture received an additional distribution from the joint venture of $6.7 million in July 2017 that was reported in other liabilities on our consolidated balance sheet as of December 31, 2016.

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Investing Receivables (Tables)

9 Months Ended

Sep. 30, 2017

Receivables [Abstract]

Schedule of investing receivables

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

	September 30, 2017		December 31, 2016
Notes receivable from the City of Huntsville	$	53,088	$	49,258
Other investing loans receivable	3,020		3,021
	$	56,108	$	52,279

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Prepaid Expenses and Other Assets, Net (Tables)

9 Months Ended

Sep. 30, 2017

Prepaid Expense and Other Assets [Abstract]

Schedule of prepaid expenses and other assets

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

	September 30, 2017		December 31, 2016
Prepaid expenses	$	30,932	$	24,432
Lease incentives, net	17,202		18,276
Furniture, fixtures and equipment, net	5,422		5,204
Deferred tax asset, net (1)	2,851		3,036
Non-real estate equity method investments	2,413		2,355
Construction contract costs incurred in excess of billings	2,005		10,350
Deferred financing costs, net (2)	1,419		3,128
Other assets	4,294		5,983
Prepaid expenses and other assets, net	$	66,538	$	72,764

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

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

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Debt, Net (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Schedule of debt

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

	Carrying Value (1) as of
	September 30, 2017		December 31, 2016		Stated Interest Rates as of	Scheduled Maturity as of
					September 30, 2017	September 30, 2017
Mortgage and Other Secured Debt:
Fixed rate mortgage debt (2)	$	151,594	$	154,143	3.82% - 7.87% (3)	2019-2026
Variable rate secured debt	13,200		13,448		LIBOR + 1.85% (4)	October 2020
Total mortgage and other secured debt	164,794		167,591
Revolving Credit Facility	170,000		—		LIBOR + 0.875% to 1.60% (5)	May 2019 (6)
Term Loan Facilities (7)	348,371		547,494		LIBOR + 0.90% to 2.40% (8)	2020-2022
Unsecured Senior Notes
3.600%, $350,000 aggregate principal	347,445		347,128		3.60% (9)	May 2023
5.250%, $250,000 aggregate principal	246,525		246,176		5.25% (10)	February 2024
3.700%, $300,000 aggregate principal	298,200		297,843		3.70% (11)	June 2021
5.000%, $300,000 aggregate principal	296,639		296,368		5.00% (12)	July 2025
Unsecured notes payable	1,317		1,401		0% (13)	2026
Total debt, net	$	1,873,291	$	1,904,001

(1) The carrying values of our debt other than the Revolving Credit Facility reflect net deferred financing costs of $4.8 million as of September 30, 2017 and $6.1 million as of December 31, 2016.

(2)   Certain 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 $367,000 as of September 30, 2017 and $422,000 as of December 31, 2016.

(3) The weighted average interest rate on our fixed rate mortgage debt was 4.19% as of September 30, 2017.

(4)  The interest rate on our variable rate secured debt as of September 30, 2017 was 3.09%.

(5) The weighted average interest rate on the Revolving Credit Facility was 2.40% as of September 30, 2017.

(6) The facility matures in May 2019, with the ability for us to further extend such maturity by twosix-month periods at our option, provided that there is no default under the facility and we pay an extension fee of 0.075% of the total availability under the facility for each extension period.

(7)   As of September 30, 2017, we have the ability to borrow an additional $350.0 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 May 1, 2017, we repaid $200.0 million of the loan balance on a term loan scheduled to mature in 2020.

(8)  The weighted average interest rate on these loans was 2.93% as of September 30, 2017.

(9) The carrying value of these notes reflects an unamortized discount totaling $1.8 millionas of September 30, 2017 and $2.0 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.70%. 

(10) The carrying value of these notes reflectsan unamortized discount totaling $3.1 millionas of September 30, 2017 and $3.4 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.49%. 

(11) The carrying value of these notes reflects an unamortized discount totaling $1.4 millionas of September 30, 2017 and $1.7 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 3.85%. 

(12) The carrying value of these notes reflects an unamortized discount totaling $2.8 millionas of September 30, 2017 and $3.0 million as of December 31, 2016.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

(13)  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 $394,000 as of September 30, 2017 and $460,000 as of December 31, 2016.

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, 2017				December 31, 2016
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Fixed-rate debt
Unsecured Senior Notes	$	1,188,809	$	1,231,222	$	1,187,515	$	1,220,282
Other fixed-rate debt	152,911		154,781		155,544		156,887
Variable-rate debt	531,571		531,520		560,942		558,437
	$	1,873,291	$	1,917,523	$	1,904,001	$	1,935,606

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Interest Rate Derivatives (Tables)

9 Months Ended

Sep. 30, 2017

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, each of which was designated as a cash flow hedge of interest rate risk (dollars in thousands):

							Fair Value at
Notional Amount			Fixed Rate	Floating Rate Index	Effective Date	Expiration Date	September 30, 2017			December 31, 2016
$	100,000		1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	$	(237	)	$	(848	)
13,311		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	126			100
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	(27		)	(23		)
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	(22		)	48
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	(30		)	10
100,000		(2)	1.6730%	One-Month LIBOR	9/1/2015	8/1/2019	—			(701		)
							$	(190	)	$	(1,414	)

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

(2) We cash settled this derivative and interest accrued thereon for $460,000 on May 1, 2017. Since the hedged transactions associated with this derivative were still probable to occur as of the settlement date, amounts in accumulated other comprehensive loss (“AOCL”) associated with this derivative will be reclassified to interest expense through August 2019.

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, 2017			December 31, 2016
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets	$	126		$	158
Interest rate swaps designated as cash flow hedges	Other liabilities	(316		)	(1,572		)

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,
	2017			2016			2017			2016
Unrealized (loss) gain recognized in AOCL (effective portion)	$	(301	)	$	407		$	(1,877	)	$	(16,581	)
Loss reclassified from AOCL into interest expense (effective portion)	(615		)	(1,043		)	(2,652		)	(2,763		)
Gain (loss) on derivatives recognized in interest expense (ineffective portion)	34			1,523			132			(347		)
Loss reclassified from AOCL into interest expense (ineffective portion) (1)	—			—			(88		)	—

(1) Represents a loss recognized on certain interest rate swaps from the accelerated reclassification of amounts in AOCL on May 1, 2017, when we concluded that hedged forecasted transactions were probable not to occur.

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Redeemable Noncontrolling Interests (Tables)

9 Months Ended

Sep. 30, 2017

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,
	2017			2016
Beginning balance	$	22,979		$	19,218
Contributions from noncontrolling interests	—			22,779
Distributions to noncontrolling interests	(1,186		)	(21,344		)
Net income attributable to noncontrolling interests	1,720			1,679
Adjustment to arrive at fair value of interests	(244		)	516
Ending balance	$	23,269		$	22,848

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Information by Business Segment (Tables)

9 Months Ended

Sep. 30, 2017

Segment Reporting [Abstract]

Schedule of segment financial information for real estate operations

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

	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, 2017
Revenues from real estate operations	$	61,254		$	12,190		$	11,024		$	7,494		$	3,532		$	6,676		$	102,170		$	16,656		$	7,398		$	1,007		$	127,231
Property operating expenses	(19,708		)	(4,343		)	(6,193		)	(3,157		)	(1,432		)	(637		)	(35,470		)	(7,406		)	(3,175		)	(317		)	(46,368		)
UJV NOI allocable to COPT	—			—			—			—			—			1,297			1,297			—			—			—			1,297
NOI from real estate operations	$	41,546		$	7,847		$	4,831		$	4,337		$	2,100		$	7,336		$	67,997		$	9,250		$	4,223		$	690		$	82,160
Additions to long-lived assets	$	5,810		$	2,587		$	55		$	1,910		$	843		$	—		$	11,205		$	5,338		$	9		$	76		$	16,628
Transfers from non-operating properties	$	5,519		$	45,554		$	—		$	8		$	(62	)	$	29,803		$	80,822		$	25		$	—		$	—		$	80,847
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
Nine Months Ended September 30, 2017
Revenues from real estate operations	$	183,393		$	34,992		$	35,687		$	21,953		$	10,616		$	17,998		$	304,639		$	52,394		$	21,201		$	4,061		$	382,295
Property operating expenses	(60,357		)	(13,014		)	(21,125		)	(9,391		)	(4,294		)	(1,873		)	(110,054		)	(21,974		)	(10,041		)	(1,446		)	(143,515		)
UJV NOI allocable to COPT	—			—			—			—			—			3,889			3,889			—			—			—			3,889
NOI from real estate operations	$	123,036		$	21,978		$	14,562		$	12,562		$	6,322		$	20,014		$	198,474		$	30,420		$	11,160		$	2,615		$	242,669
Additions to long-lived assets	$	15,085		$	6,032		$	71		$	6,309		$	1,059		$	—		$	28,556		$	16,476		$	3,588		$	203		$	48,823
Transfers from non-operating properties	$	37,094		$	45,994		$	—		$	474		$	1,643		$	55,003		$	140,208		$	—		$	8		$	18		$	140,234
Segment assets at September 30, 2017	$	1,265,569		$	400,855		$	129,657		$	194,801		$	108,884		$	258,611		$	2,358,377		$	398,579		$	226,909		$	13,347		$	2,997,212
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

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,
	2017		2016		2017		2016
Segment revenues from real estate operations	$	127,231	$	130,954	$	382,295	$	397,965
Construction contract and other service revenues	29,786		11,149		65,958		34,372
Total revenues	$	157,017	$	142,103	$	448,253	$	432,337

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,
	2017			2016			2017			2016
UJV NOI allocable to COPT	$	1,297		$	1,008		$	3,889		$	1,008
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(577		)	(415		)	(1,724		)	(415		)
Add: Equity in (loss) income of unconsolidated non-real estate entities	(1		)	1			(3		)	21
Equity in income of unconsolidated entities	$	719		$	594		$	2,162		$	614

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,
	2017			2016			2017			2016
Construction contract and other service revenues	$	29,786		$	11,149		$	65,958		$	34,372
Construction contract and other service expenses	(28,788		)	(10,341		)	(63,589		)	(32,513		)
NOI from service operations	$	998		$	808		$	2,369		$	1,859

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 before gain on sales of real estate as reported on our consolidated statements of operations (in thousands):

	For the Three Months Ended September 30,						For the Nine Months Ended September 30,
	2017			2016			2017			2016
NOI from real estate operations	$	82,160		$	82,010		$	242,669		$	249,005
NOI from service operations	998			808			2,369			1,859
Interest and other income	1,508			1,391			4,817			3,877
Equity in income of unconsolidated entities	719			594			2,162			614
Income tax (expense) benefit	(57		)	21			(145		)	28
Depreciation and other amortization associated with real estate operations	(34,438		)	(32,015		)	(100,290		)	(99,790		)
Impairment recoveries (losses)	161			(27,699		)	(1,464		)	(99,837		)
General, administrative and leasing expenses	(7,368		)	(8,855		)	(23,838		)	(28,764		)
Business development expenses and land carry costs	(1,277		)	(1,716		)	(4,567		)	(6,497		)
Interest expense	(19,615		)	(18,301		)	(57,772		)	(64,499		)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,297		)	(1,008		)	(3,889		)	(1,008		)
Loss on early extinguishment of debt	—			(59		)	(513		)	(37		)
Income (loss) before gain on sales of real estate	$	21,494		$	(4,829	)	$	59,539		$	(45,049	)

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, 2017		September 30, 2016
Segment assets	$	2,997,212	$	3,027,125
Non-operating property assets	413,255		421,364
Other assets	149,305		185,705
Total COPT consolidated assets	$	3,559,772	$	3,634,194

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Share-Based Compensation and Other Compensation Matters (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017

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,
	2017			2016			2017			2016
Numerator:
Net income (loss) attributable to COPT	$	20,916		$	27,299		$	60,133		$	(13,294	)
Preferred share dividends	—			(3,552		)	(6,219		)	(10,657		)
Issuance costs associated with redeemed preferred shares	—			—			(6,847		)	—
Income attributable to share-based compensation awards	(95		)	(105		)	(337		)	(319		)
Numerator for basic and diluted EPS on net income (loss) attributable to COPT common shareholders	$	20,821		$	23,642		$	46,730		$	(24,270	)
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	99,112			94,433			98,855			94,312
Dilutive effect of share-based compensation awards	146			81			154			—
Denominator for diluted EPS (common shares)	99,258			94,514			99,009			94,312
Basic EPS:
Net income (loss) attributable to COPT common shareholders	$	0.21		$	0.25		$	0.47		$	(0.26	)
Diluted EPS:
Net income (loss) attributable to COPT common shareholders	$	0.21		$	0.25		$	0.47		$	(0.26	)

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,
	2017	2016	2017	2016
Conversion of common units	3,350	3,591	3,400	3,648
Conversion of Series I Preferred Units	176	176	176	176
Conversion of Series K Preferred Shares	—	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,
	2017			2016			2017			2016
Numerator:
Net income (loss) attributable to COPLP common unitholders	$	21,785		$	28,359		$	62,239		$	(13,751	)
Preferred unit distributions	(165		)	(3,717		)	(6,714		)	(11,152		)
Issuance costs associated with redeemed preferred units	—			—			(6,847		)	—
Income attributable to share-based compensation awards	(95		)	(105		)	(337		)	(319		)
Numerator for basic and diluted EPU on net income (loss) attributable to COPLP common unitholders	$	21,525		$	24,537		$	48,341		$	(25,222	)
Denominator (all weighted averages):
Denominator for basic EPU (common units)	102,462			98,024			102,255			97,960
Dilutive effect of share-based compensation awards	146			81			154			—
Denominator for diluted EPU (common units)	102,608			98,105			102,409			97,960
Basic EPU:
Net income (loss) attributable to COPLP common unitholders	$	0.21		$	0.25		$	0.47		$	(0.26	)
Diluted EPU:
Net income (loss) attributable to COPLP common unitholders	$	0.21		$	0.25		$	0.47		$	(0.26	)

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,
	2017	2016	2017	2016
Conversion of Series I preferred units	176	176	176	176
Conversion of Series K preferred units	—	434	—	434

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2017

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, 2017 follow (in thousands):

Year Ending December 31,
2017 (1)	$	320
2018	1,275
2019	1,263
2020	1,257
2021	1,260
Thereafter	85,761
	$	91,136

(1) Represents the three months ending December 31, 2017.

Future minimum lease payments for capital leases

Future minimum rental payments due under the term of this lease as of September 30, 2017 follow (in thousands):

Year Ending December 31,
2017 (1)	$	700
2018	15,775
2020	135
Thereafter	75
Total minimum rental payments	$	16,685
Less: Amount representing interest	(338		)
Capital lease obligation	$	16,347

(1) Represents the three months ending December 31, 2017.

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Organization (Details) ft² in Thousands	Sep. 30, 2017 a ft² buillding Property MW
Operating office properties
Investments in real estate
Number of real estate properties	159
Area of real estate property (in square feet or acres) | ft²	17,400
Operating office properties | Single-tenant data centers
Investments in real estate
Number of real estate properties | buillding	15
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	1,087
Office properties under, or contractually committed for, construction or approved for redevelopment | Single-tenant data centers
Investments in real estate
Number of real estate properties | buillding	3
Office properties under, or contractually committed for, construction or approved for redevelopment | Partially operational properties
Investments in real estate
Number of real estate properties	3
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
Land controlled for future development
Investments in real estate
Area of real estate property (in square feet or acres) | a	984
Developable square feet | ft²	12,300
Other Land
Investments in real estate
Area of real estate property (in square feet or acres) | a	152
Operating wholesale data centers
Investments in real estate
Critical load (in megawatts) | MW	19.25
GI-COPT | Operating office properties | Single-tenant data centers
Investments in real estate
Number of real estate properties	6

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Organization (Details 2) - Corporate Office Properties, L.P.	9 Months Ended
	Sep. 30, 2017
Common Units
Forms of ownership in Operating Partnership and ownership percentage by the entity
Percentage ownership in operating partnership	96.80%
Preferred Units
Forms of ownership in Operating Partnership and ownership percentage by the entity
Percentage ownership in operating partnership	0.00%

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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Minimum rental payments due		$ 91,136
Ground Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Minimum rental payments due		$ 90,200
Accounting Standards Update 2014-09
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of change on net income	$ 18,000

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Fair Value Measurements (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jun. 30, 2017	Sep. 30, 2017
Assets held for sale, net | Fair value measurement on a nonrecurring basis | White Marsh, Maryland
Assets and liabilities measured at fair value
Impairment losses	$ 1.6
Deferred compensation plan | Management
Assets and liabilities measured at fair value
Maximum percentage of participants' compensation which is deferrable (as a percent)		100.00%
Balance of the plan which was fully funded		$ 4.4

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Fair Value Measurements (Details 2) - Fair value measurement on a recurring basis $ in Thousands	Sep. 30, 2017 USD ($)
Assets:
Interest rate derivatives	$ 126
Total assets	4,533
Liabilities:
Deferred compensation plan liability	4,407
Interest rate derivatives	316
Liabilities	4,723
Mutual funds
Assets:
Marketable securities in deferred compensation plan	4,336
Other
Assets:
Marketable securities in deferred compensation plan	71
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets	4,407
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds
Assets:
Marketable securities in deferred compensation plan	4,336
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Assets:
Marketable securities in deferred compensation plan	71
Significant Other Observable Inputs (Level 2)
Assets:
Interest rate derivatives	126
Total assets	126
Liabilities:
Deferred compensation plan liability	4,407
Interest rate derivatives	316
Liabilities	4,723
Corporate Office Properties, L.P.
Assets:
Interest rate derivatives	126
Liabilities:
Interest rate derivatives	316
Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2)
Assets:
Interest rate derivatives	126
Liabilities:
Interest rate derivatives	$ 316

XML

Properties, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Investments in real estate
Operating properties, net	$ 2,690,712	$ 2,671,831
Operating Properties
Investments in real estate
Less: accumulated depreciation	(759,262)	(706,385)
Operating properties, net	2,690,712	2,671,831
Operating Properties | Land
Investments in real estate
Gross	440,771	433,311
Operating Properties | Buildings and improvements
Investments in real estate
Gross	$ 3,009,203	$ 2,944,905

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Properties, Net (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Properties
Projects in development or held for future development	$ 406,319	$ 401,531
Projects in development or held for future development
Properties
Projects in development or held for future development	406,319	401,531
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	216,108	195,521
Projects in development or held for future development | Construction in progress, excluding land
Properties
Projects in development or held for future development	$ 190,211	$ 206,010

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Properties, Net (Details 3) $ in Thousands	Sep. 30, 2017 USD ($) Property	Dec. 31, 2016 USD ($) Property
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale, net	$ 74,415	$ 94,654
Assets held for sale, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Properties, net	68,081	85,402
Deferred rent receivable	5,582	4,241
Intangible assets on real estate acquisitions, net	0	338
Deferred leasing costs, net	742	3,636
Lease incentives, net	10	1,037
Assets held for sale, net	$ 74,415	$ 94,654
Defense/Information Technology Locations | Data Center Shells | 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
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		1
Defense/Information Technology Locations | 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	1
Regional Office and Other [Member] | 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		8

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Properties, Net (Details 4)	9 Months Ended
	Sep. 30, 2017 USD ($) ft² Property	Oct. 27, 2017 USD ($) ft²
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Sale price of land	$ 14,300,000
Gain on sale of land	$ 4,200,000
Operating Properties | Defense/Information Technology Locations | Data Center Shells | 201 Technology Drive | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square footage of real estate properties (in square feet) | ft²		103,000
Transaction value		$ 29,200,000
Operating Properties | Defense/Information Technology Locations | Data Center Shells | 11751 Meadowville Lane | Subsequent Event
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Square footage of real estate properties (in square feet) | ft²		193,000
Transaction value		$ 44,300,000
Indemnification amount		$ 20,000,000
Dispositions | Operating Properties
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | Property	10
Square footage of real estate properties (in square feet) | ft²	639,000
Transaction value	$ 88,800,000
Gain on Sale	$ 1,180,000
Dispositions | Operating Properties | Defense/Information Technology Locations | Northern Virginia Defense/IT | 3120 Fairview Park Drive
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | Property	1
Square footage of real estate properties (in square feet) | ft²	190,000
Transaction value	$ 39,000,000
Gain on Sale	$ 0
Dispositions | Operating Properties | Defense/Information Technology Locations | Fort Meade/BW Corridor | 1334 Ashton Road
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | Property	1
Square footage of real estate properties (in square feet) | ft²	37,000
Transaction value	$ 2,300,000
Gain on Sale	$ 0
Dispositions | Operating Properties | Regional Office and Other [Member] | White Marsh, Maryland
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties | Property	8
Square footage of real estate properties (in square feet) | ft²	412,000
Transaction value	$ 47,500,000
Gain on Sale	$ 1,180,000

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Properties, Net (Details 5) ft² in Thousands	9 Months Ended
	Sep. 30, 2017 ft² Property
Office properties under, or contractually committed for, construction or approved for redevelopment
Construction, Redevelopment and Dispositions
Number of real estate properties	10
Square footage of real estate properties (in square feet) | ft²	1,087
Newly constructed properties placed in service
Construction, Redevelopment and Dispositions
Square feet of properties placed in service | ft²	751
Number of real estate properties	5
Newly redeveloped properties placed in service
Construction, Redevelopment and Dispositions
Square feet of properties placed in service | ft²	88
Number of real estate properties	3
Properties under construction or contractually committed for construction
Construction, Redevelopment and Dispositions
Number of real estate properties	8
Square footage of real estate properties (in square feet) | ft²	1,051
Properties completed Held-for-future lease | Office properties under, or contractually committed for, construction or approved for redevelopment
Construction, Redevelopment and Dispositions
Number of real estate properties	2
Properties under or approved for redevelopment
Construction, Redevelopment and Dispositions
Number of real estate properties	2
Square footage of real estate properties (in square feet) | ft²	36

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Real Estate Joint Ventures (Details) $ in Thousands	1 Months Ended	9 Months Ended
	Jul. 31, 2017 USD ($)	Sep. 30, 2017 USD ($) buillding Property	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Investments in consolidated real estate joint ventures
Due to Affiliate		$ 7,860	$ 14,329
Real estate equity method investments		2,413		$ 2,355
GI-COPT
Investments in consolidated real estate joint ventures
Real estate equity method investments		25,200
Difference between cost basis and our share of the underlying equity		17,100
Consolidated real estate joint ventures
Investments in consolidated real estate joint ventures
Total Assets		300,087
Encumbered Assets		122,187
Total Liabilities		$ 120,805
Variable Interest Entity, Primary Beneficiary | LW Redstone Company, LLC
Investments in consolidated real estate joint ventures
Ownership (as a percent)		85.00%
Total Assets		$ 158,937
Encumbered Assets		76,374
Total Liabilities		$ 50,344
Variable Interest Entity, Primary Beneficiary | M Square Associates, LLC
Investments in consolidated real estate joint ventures
Ownership (as a percent)		50.00%
Total Assets		$ 70,767
Encumbered Assets		45,813
Total Liabilities		$ 46,895
Variable Interest Entity, Primary Beneficiary | Stevens Investors, LLC
Investments in consolidated real estate joint ventures
Ownership (as a percent)		95.00%
Total Assets		$ 70,383
Encumbered Assets		0
Total Liabilities		$ 23,566
Due to Affiliate	$ 6,700
Operating office properties
Investments in consolidated real estate joint ventures
Number of real estate properties | Property		159
Single-tenant data centers | Operating office properties
Investments in consolidated real estate joint ventures
Number of real estate properties | buillding		15
Single-tenant data centers | Operating office properties | GI-COPT
Investments in consolidated real estate joint ventures
Ownership percentage (percent)		50.00%
Number of real estate properties | Property		6

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Investing Receivables (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 56,108	$ 52,279
Notes Receivable from City of Huntsville
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 53,088	49,258
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	$ 3,020	$ 3,021

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Prepaid Expenses and Other Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Prepaid Expense and Other Assets [Abstract]
Prepaid expenses	$ 30,932	$ 24,432
Lease incentives, net	17,202	18,276
Furniture, fixtures and equipment, net	5,422	5,204
Deferred tax asset, net	2,851	3,036
Non-real estate equity method investments	2,413	2,355
Construction contract costs incurred in excess of billings	2,005	10,350
Deferred financing costs, net	1,419	3,128
Other assets	4,294	5,983
Prepaid expenses and other assets, net	66,538	72,764
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)		3 Months Ended		9 Months Ended
	May 01, 2017 USD ($)	Sep. 30, 2017 USD ($) extension	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) extension	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Debt
Carrying Value		$ 1,873,291,000		$ 1,873,291,000		$ 1,904,001,000
Deferred financing costs, net		1,419,000		1,419,000		3,128,000
Interest costs capitalized		1,100,000	$ 1,200,000	4,200,000	$ 4,300,000
Secured Debt
Debt
Carrying Value		$ 164,794,000		$ 164,794,000		167,591,000
Line of Credit [Member] | Revolving Credit Facility
Debt
Number of extensions | extension		2		2
Extension option period (in years)				6 months
Loans payable
Debt
Deferred financing costs, net		$ 4,800,000		$ 4,800,000		6,100,000
Credit Facility [Member] | Revolving Credit Facility
Debt
Line of credit facility, extension fee percentage				0.075%
Term Loan Facilities Maturing 2020
Debt
Repayments of long-term debt	$ 200,000,000
Fixed rate debt | Secured Debt
Debt
Carrying Value		151,594,000		$ 151,594,000		154,143,000
Unamortized premium included in carrying value		$ 367,000		$ 367,000		422,000
Weighted average interest rate (as a percent)		4.19%		4.19%
Fixed rate debt | Secured Debt | Minimum
Debt
Stated interest rate (as a percent)		3.82%		3.82%
Fixed rate debt | Secured Debt | Maximum
Debt
Stated interest rate (as a percent)		7.87%		7.87%
Variable-rate debt
Debt
Description of variable rate basis				LIBOR
Variable-rate debt | Secured Debt
Debt
Carrying Value		$ 13,200,000		$ 13,200,000		13,448,000
Stated interest rate (as a percent)		3.09%		3.09%
Variable-rate debt | Secured Debt | London Interbank Offered Rate (LIBOR)
Debt
Variable rate, spread (as a percent)				1.85%
Revolving Credit Facility
Debt
Carrying Value		$ 170,000,000		$ 170,000,000		0
Description of variable rate basis				LIBOR
Weighted average interest rate (as a percent)		2.40%		2.40%
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		$ 348,371,000		$ 348,371,000		547,494,000
Description of variable rate basis				LIBOR
Weighted average interest rate (as a percent)		2.93%		2.93%
Aggregate additional borrowing capacity available		$ 350,000,000		$ 350,000,000
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)				2.40%
3.60% Senior Notes | Unsecured senior notes
Debt
Carrying Value		347,445,000		$ 347,445,000		347,128,000
Debt instrument, face amount		$ 350,000,000		$ 350,000,000
Stated interest rate (as a percent)		3.60%		3.60%
Unamortized discount included in carrying value		$ 1,800,000		$ 1,800,000		2,000,000
Interest rate on debt (as a percent)		3.70%		3.70%
5.250% Senior Notes | Unsecured senior notes
Debt
Carrying Value		$ 246,525,000		$ 246,525,000		246,176,000
Debt instrument, face amount		$ 250,000,000		$ 250,000,000
Stated interest rate (as a percent)		5.25%		5.25%
Unamortized discount included in carrying value		$ 3,100,000		$ 3,100,000		3,400,000
Interest rate on debt (as a percent)		5.49%		5.49%
3.70% Senior Notes | Unsecured senior notes
Debt
Carrying Value		$ 298,200,000		$ 298,200,000		297,843,000
Debt instrument, face amount		$ 300,000,000		$ 300,000,000
Stated interest rate (as a percent)		3.70%		3.70%
Unamortized discount included in carrying value		$ 1,400,000		$ 1,400,000		1,700,000
Interest rate on debt (as a percent)		3.85%		3.85%
5.000% Senior Notes | Unsecured senior notes
Debt
Carrying Value		$ 296,639,000		$ 296,639,000		296,368,000
Debt instrument, face amount		$ 300,000,000		$ 300,000,000
Stated interest rate (as a percent)		5.00%		5.00%
Unamortized discount included in carrying value		$ 2,800,000		$ 2,800,000		3,000,000
Interest rate on debt (as a percent)		5.15%		5.15%
Unsecured notes payable
Debt
Carrying Value		$ 1,317,000		$ 1,317,000		1,401,000
Stated interest rate (as a percent)		0.00%		0.00%
Unamortized discount included in carrying value		$ 394,000		$ 394,000		$ 460,000

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Debt, Net (Details 2) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Carrying Amount
Carrying amount and estimated fair value of debt
Long-term debt	$ 1,873,291	$ 1,904,001
Carrying Amount | Unsecured senior notes
Carrying amount and estimated fair value of debt
Long-term debt	1,188,809	1,187,515
Carrying Amount | Other fixed-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	152,911	155,544
Carrying Amount | Variable-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	531,571	560,942
Estimated Fair Value
Carrying amount and estimated fair value of debt
Long-term debt	1,917,523	1,935,606
Estimated Fair Value | Unsecured senior notes
Carrying amount and estimated fair value of debt
Long-term debt	1,231,222	1,220,282
Estimated Fair Value | Other fixed-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	154,781	156,887
Estimated Fair Value | Variable-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	$ 531,520	$ 558,437

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Interest Rate Derivatives (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	May 01, 2017	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Unrealized (loss) gain recognized in AOCL (effective portion)		$ (301)	$ 407	$ (1,877)	$ (16,581)
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		1,600		1,600
Interest rate derivatives in liability position, fair value		305		305
Termination value to settle obligations under interest rate derivative agreements		484		484
Interest rate swaps | Interest Expense
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Loss reclassified from AOCL into interest expense (effective portion)		(615)	(1,043)	(2,652)	(2,763)
Gain (loss) on derivatives recognized in interest expense (ineffective portion)		34	1,523	132	(347)
Loss reclassified from AOCL into interest expense (ineffective portion)		0	$ 0	(88)	$ 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		126		126		$ 158
Interest rate swaps | Other Liabilities
Fair value of interest rate derivatives and balance sheet classification
Interest rate swaps designated as cash flow hedges		(316)		(316)		(1,572)
Designated
Fair values of interest rate swap derivatives
Fair value of interest rate swaps		(190)		(190)		(1,414)
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		$ (237)		$ (237)		(848)
Designated | Interest rate swap, effective October 13, 2015
Fair values of interest rate swap derivatives
Notional Amount		$ 13,311		$ 13,311
Fixed rate (as a percent)		1.39%		1.39%
Fair value of interest rate swaps		$ 126		$ 126		100
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		$ (27)		$ (27)		(23)
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		$ (22)		$ (22)		48
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		$ (30)		$ (30)		10
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		$ 0		$ 0		$ (701)
Interest rate swap cash settled	$ 460

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Redeemable Noncontrolling Interests (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) joint_venture	Sep. 30, 2016 USD ($)
Noncontrolling Interest [Abstract]
Number of joint ventures with redeemable noncontrolling interests | joint_venture	2
Redeemable Noncontrolling Interest [Roll Forward]
Beginning balance	$ 22,979	$ 19,218
Contributions from noncontrolling interests	0	22,779
Distributions to noncontrolling interests	(1,186)	(21,344)
Net income attributable to noncontrolling interests	1,720	1,679
Adjustment to arrive at fair value of interests	(244)	516
Ending balance	$ 23,269	$ 22,848

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Equity (Details) - USD ($) $ / shares in Units, $ in Thousands			3 Months Ended	9 Months Ended
	Jun. 27, 2017	Jan. 21, 2017	Dec. 31, 2016	Sep. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Redemption of preferred shares (6,900,000 shares)				$ 172,500
Conversion of common units to common shares (in units/shares)				337,000	87,000
Common Stock Issued to Public Under At-the-Market Program
Class of Stock [Line Items]
Shares issued to the public (in shares)				591,042
Issuance of stock, weighted average price per share (in dollars per share)				$ 33.84
Net proceeds from shares issued				$ 19,700
Payments of stock issuance costs				300
At-market stock, offering program established, remaining capacity				70,000
Series K Cumulative Preferred Stock
Class of Stock [Line Items]
Dividend rate (percent)		5.60%
Preferred stock, redemption price per share (in dollars per share)		$ 50.00
Redemption of preferred shares (6,900,000 shares)		$ 26,600
Issuance costs associated with redeemed preferred shares			$ 17
Series L Cumulative Preferred Stock
Class of Stock [Line Items]
Dividend rate (percent)	7.375%
Preferred stock, redemption price per share (in dollars per share)	$ 25.00
Redemption of preferred shares (6,900,000 shares)	$ 172,500
Issuance costs associated with redeemed preferred shares				$ 6,800

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Information by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Segment financial information for real estate operations
Revenues from real estate operations	$ 127,231	$ 130,954	$ 382,295	$ 397,965
Property operating expenses	(46,368)	(49,952)	(143,515)	(149,968)
UJV NOI allocable to COPT	1,297	1,008	3,889	1,008
NOI from real estate operations	82,160	82,010	242,669	249,005
Additions to long-lived assets	16,628	22,232	48,823	51,655
Transfers from non-operating properties	80,847	34,291	140,234	154,732
Segment assets	3,559,772	3,634,194	3,559,772	3,634,194	$ 3,780,885
Defense/Information Technology Locations
Segment financial information for real estate operations
Revenues from real estate operations	102,170	101,819	304,639	305,146
Property operating expenses	(35,470)	(37,673)	(110,054)	(112,182)
UJV NOI allocable to COPT	1,297	1,008	3,889	1,008
NOI from real estate operations	67,997	65,154	198,474	193,972
Additions to long-lived assets	11,205	17,903	28,556	42,077
Transfers from non-operating properties	80,822	34,255	140,208	155,030
Defense/Information Technology Locations | Fort Meade/BW Corridor
Segment financial information for real estate operations
Revenues from real estate operations	61,254	61,460	183,393	184,881
Property operating expenses	(19,708)	(20,598)	(60,357)	(64,222)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	41,546	40,862	123,036	120,659
Additions to long-lived assets	5,810	5,901	15,085	19,516
Transfers from non-operating properties	5,519	5,331	37,094	41,850
Defense/Information Technology Locations | Northern Virginia Defense/IT
Segment financial information for real estate operations
Revenues from real estate operations	12,190	12,231	34,992	36,404
Property operating expenses	(4,343)	(4,462)	(13,014)	(13,310)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	7,847	7,769	21,978	23,094
Additions to long-lived assets	2,587	7,153	6,032	13,290
Transfers from non-operating properties	45,554	308	45,994	28,158
Defense/Information Technology Locations | Lackland Air Force Base
Segment financial information for real estate operations
Revenues from real estate operations	11,024	12,532	35,687	34,408
Property operating expenses	(6,193)	(7,599)	(21,125)	(19,863)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	4,831	4,933	14,562	14,545
Additions to long-lived assets	55	0	71	0
Transfers from non-operating properties	0	3	0	240
Defense/Information Technology Locations | Navy Support Locations
Segment financial information for real estate operations
Revenues from real estate operations	7,494	7,232	21,953	21,164
Property operating expenses	(3,157)	(3,374)	(9,391)	(9,573)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	4,337	3,858	12,562	11,591
Additions to long-lived assets	1,910	2,207	6,309	5,710
Transfers from non-operating properties	8	0	474	0
Defense/Information Technology Locations | Redstone Arsenal
Segment financial information for real estate operations
Revenues from real estate operations	3,532	3,189	10,616	9,496
Property operating expenses	(1,432)	(1,112)	(4,294)	(3,050)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	2,100	2,077	6,322	6,446
Additions to long-lived assets	843	2,642	1,059	3,561
Transfers from non-operating properties	(62)	3,100	1,643	3,315
Defense/Information Technology Locations | Data Center Shells
Segment financial information for real estate operations
Revenues from real estate operations	6,676	5,175	17,998	18,793
Property operating expenses	(637)	(528)	(1,873)	(2,164)
UJV NOI allocable to COPT	1,297	1,008	3,889	1,008
NOI from real estate operations	7,336	5,655	20,014	17,637
Additions to long-lived assets	0	0	0	0
Transfers from non-operating properties	29,803	25,513	55,003	81,467
Regional Office
Segment financial information for real estate operations
Revenues from real estate operations	16,656	20,499	52,394	67,284
Property operating expenses	(7,406)	(8,155)	(21,974)	(26,707)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	9,250	12,344	30,420	40,577
Additions to long-lived assets	5,338	4,168	16,476	9,107
Transfers from non-operating properties	25	(4)	0	104
Operating wholesale data centers
Segment financial information for real estate operations
Revenues from real estate operations	7,398	6,809	21,201	20,106
Property operating expenses	(3,175)	(3,317)	(10,041)	(8,629)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	4,223	3,492	11,160	11,477
Additions to long-lived assets	9	108	3,588	108
Transfers from non-operating properties	0	40	8	(391)
Other Segments
Segment financial information for real estate operations
Revenues from real estate operations	1,007	1,827	4,061	5,429
Property operating expenses	(317)	(807)	(1,446)	(2,450)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	690	1,020	2,615	2,979
Additions to long-lived assets	76	53	203	363
Transfers from non-operating properties	0	0	18	(11)
Segment assets
Segment financial information for real estate operations
Segment assets	2,997,212	3,027,125	2,997,212	3,027,125
Segment assets | Defense/Information Technology Locations
Segment financial information for real estate operations
Segment assets	2,358,377	2,307,245	2,358,377	2,307,245
Segment assets | Defense/Information Technology Locations | Fort Meade/BW Corridor
Segment financial information for real estate operations
Segment assets	1,265,569	1,261,337	1,265,569	1,261,337
Segment assets | Defense/Information Technology Locations | Northern Virginia Defense/IT
Segment financial information for real estate operations
Segment assets	400,855	416,886	400,855	416,886
Segment assets | Defense/Information Technology Locations | Lackland Air Force Base
Segment financial information for real estate operations
Segment assets	129,657	132,722	129,657	132,722
Segment assets | Defense/Information Technology Locations | Navy Support Locations
Segment financial information for real estate operations
Segment assets	194,801	195,244	194,801	195,244
Segment assets | Defense/Information Technology Locations | Redstone Arsenal
Segment financial information for real estate operations
Segment assets	108,884	111,310	108,884	111,310
Segment assets | Defense/Information Technology Locations | Data Center Shells
Segment financial information for real estate operations
Segment assets	258,611	189,746	258,611	189,746
Segment assets | Regional Office
Segment financial information for real estate operations
Segment assets	398,579	453,766	398,579	453,766
Segment assets | Operating wholesale data centers
Segment financial information for real estate operations
Segment assets	226,909	234,551	226,909	234,551
Segment assets | Other Segments
Segment financial information for real estate operations
Segment assets	$ 13,347	$ 31,563	$ 13,347	$ 31,563

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Information by Business Segment (Details 2) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of segment revenues to total revenues
Segment revenues from real estate operations	$ 127,231	$ 130,954	$ 382,295	$ 397,965
Construction contract and other service revenues	29,786	11,149	65,958	34,372
Total revenues	157,017	142,103	448,253	432,337
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated Entities
UJV NOI allocable to COPT	1,297	1,008	3,889	1,008
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(577)	(415)	(1,724)	(415)
Add: Equity in (loss) income of unconsolidated non-real estate entities	(1)	1	(3)	21
Equity in income of unconsolidated entities	719	594	2,162	614
Computation of net operating income from service operations
Construction contract and other service revenues	29,786	11,149	65,958	34,372
Construction contract and other service expenses	(28,788)	(10,341)	(63,589)	(32,513)
NOI from service operations	$ 998	$ 808	$ 2,369	$ 1,859

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Information by Business Segment (Details 3) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Reconciliation of NOI from real estate operations and NOI from service operations to (loss) income from continuing operations
NOI from real estate operations	$ 82,160	$ 82,010	$ 242,669	$ 249,005
NOI from service operations	998	808	2,369	1,859
Interest and other income	1,508	1,391	4,817	3,877
Equity in income of unconsolidated entities	719	594	2,162	614
Income tax (expense) benefit	(57)	21	(145)	28
Depreciation and other amortization associated with real estate operations	(34,438)	(32,015)	(100,290)	(99,790)
Impairment recoveries (losses)	161	(27,699)	(1,464)	(99,837)
General, administrative and leasing expenses	(7,368)	(8,855)	(23,838)	(28,764)
Business development expenses and land carry costs	(1,277)	(1,716)	(4,567)	(6,497)
Interest expense	(19,615)	(18,301)	(57,772)	(64,499)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,297)	(1,008)	(3,889)	(1,008)
Loss on early extinguishment of debt	0	(59)	(513)	(37)
Income (loss) before gain on sales of real estate	$ 21,494	$ (4,829)	$ 59,539	$ (45,049)

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Information by Business Segment (Details 4) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Reconciliation of segment assets to total assets
Assets	$ 3,559,772	$ 3,780,885	$ 3,634,194
Segment assets
Reconciliation of segment assets to total assets
Assets	2,997,212		3,027,125
Non-operating property assets
Reconciliation of segment assets to total assets
Assets	413,255		421,364
Other assets
Reconciliation of segment assets to total assets
Assets	$ 149,305		$ 185,705

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Share-Based Compensation and Other Compensation Matters (Details)					9 Months Ended
	Aug. 23, 2017 USD ($) $ / shares shares	Aug. 22, 2017 $ / shares	Feb. 07, 2017 shares	Jan. 01, 2017 USD ($) employee Percentile_Rank $ / shares shares	Sep. 30, 2017 USD ($) $ / shares shares
Other Share-based Compensation Additional Disclosures
Options exercised in period (in shares or units)					5,000
Restricted shares
Share-Based Compensation
Stock awards granted (in shares or units)					230,635
Aggregate grant date fair value | $					$ 7,800,000
Assumptions used to value stock awards
Weighted average grant date fair value (in dollars per share) | $ / shares					$ 33.96
Other Share-based Compensation Additional Disclosures
Shares vested (in shares)					148,401
Weighted average fair value of shares vested (in dollars per share) | $ / shares					$ 26.18
Aggregate intrinsic value of awards upon vesting | $					$ 5,000,000
Deferred share awards
Share-Based Compensation
Stock awards granted (in shares or units)					10,032
Aggregate grant date fair value | $					$ 326,000
Assumptions used to value stock awards
Weighted average grant date fair value (in dollars per share) | $ / shares					$ 32.47
Other Share-based Compensation Additional Disclosures
Shares vested (in shares)					15,590
Weighted average fair value of shares vested (in dollars per share) | $ / shares					$ 26.89
Aggregate intrinsic value of awards upon vesting | $					$ 508,000
Options
Other Share-based Compensation Additional Disclosures
Options exercised in period (in shares or units)					5,000
Options exercised weighted average exercise price (in dollars per share) | $ / shares					$ 29.98
Intrinsic value of options exercised | $					$ 18,000
2017 PSU Grants | Performance share units
Share-Based Compensation
Stock awards granted (in shares or units)	2,826			36,525
Aggregate grant date fair value | $				$ 1,400,000
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
Negative TSR Modifier payout percentage	100.00%
Incremental value of awards | $	$ 12,000
Weighted average grant date fair value (in dollars per share) | $ / shares	$ 46.39	$ 49.66		$ 38.43
Baseline value per common share (in dollars per share) | $ / shares	$ 33.40			$ 31.22
Expected volatility of common shares (as a percent)	18.70%			19.00%
Risk-free interest rate (as a percent)	1.36%			1.47%
2017 PSU Grants | Performance share units | Executive Officer [Member]
Share-Based Compensation
Number of employees affected | employee				3
2014 PSU Grants | Performance share units | Chief Executive Officer
Other Share-based Compensation Additional Disclosures
Shares issued (in shares)			9,763
Percentage of target			100.00%

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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, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Numerator:
Net income (loss) attributable to COPT	$ 20,916	$ 27,299	$ 60,133	$ (13,294)
Preferred share/unit dividends/distributions	0	(3,552)	(6,219)	(10,657)
Issuance costs associated with redeemed preferred shares	0	0	(6,847)	0
Income attributable to share-based compensation awards	(95)	(105)	(337)	(319)
Numerator for basic and diluted EPS on net income (loss) attributable to COPT common shareholders	$ 20,821	$ 23,642	$ 46,730	$ (24,270)
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	99,112	94,433	98,855	94,312
Dilutive effect of share-based compensation awards (shares)	146	81	154	0
Denominator for diluted EPS (common shares)	99,258	94,514	99,009	94,312
Basic EPS:
Net income (loss) attributable to COPT common shareholders - basic (in dollars per share/unit)	$ 0.21	$ 0.25	$ 0.47	$ (0.26)
Diluted EPS:
Net income (loss) attributable to COPT common shareholders - diluted (in dollars per share/unit)	$ 0.21	$ 0.25	$ 0.47	$ (0.26)
Corporate Office Properties, L.P.
Numerator:
Net income (loss) attributable to COPT	$ 21,785	$ 28,359	$ 62,239	$ (13,751)
Preferred share/unit dividends/distributions	(165)	(3,717)	(6,714)	(11,152)
Issuance costs associated with redeemed preferred shares	0	0	(6,847)	0
Income attributable to share-based compensation awards	(95)	(105)	(337)	(319)
Numerator for basic and diluted EPS on net income (loss) attributable to COPT common shareholders	$ 21,525	$ 24,537	$ 48,341	$ (25,222)
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	102,462	98,024	102,255	97,960
Dilutive effect of share-based compensation awards (shares)	146	81	154	0
Denominator for diluted EPS (common shares)	102,608	98,105	102,409	97,960
Basic EPS:
Net income (loss) attributable to COPT common shareholders - basic (in dollars per share/unit)	$ 0.21	$ 0.25	$ 0.47	$ (0.26)
Diluted EPS:
Net income (loss) attributable to COPT common shareholders - diluted (in dollars per share/unit)	$ 0.21	$ 0.25	$ 0.47	$ (0.26)

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Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details 2) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Conversion of common units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	3,350,000	3,591,000	3,400,000	3,648,000
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)	0	434,000	0	434,000
Weighted average restricted stock and deferred shares
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	445,000	375,000	431,000	394,000
Weighted average options
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	40,000	233,000	80,000	307,000
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)	445,000	375,000	431,000	394,000
Corporate Office Properties, L.P. | Weighted average options
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	40,000	233,000	80,000	307,000
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)	0	434,000	0	434,000

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Commitments and Contingencies - Narrative (Details)	May 25, 2017 USD ($)	Sep. 30, 2017 USD ($) Property	Dec. 31, 2016 USD ($)	Aug. 31, 2010 USD ($)
Capital Leases
Capital lease term	99 years
Purchase option	$ 1
Capital lease obligation	$ 16,100,000	$ 16,347,000	$ 0
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
Capital Leases
Purchase obligations		35,100,000
Capital Expenditures For Operating Properties
Capital Leases
Purchase obligations		45,800,000
Third Party Construction and Development
Capital Leases
Purchase obligations		67,400,000
Other Obligations
Capital Leases
Purchase obligations		1,100,000
Specialty Tax Guarantee
Tax incremental financing obligation
Liability recognized with regard to tax incremental financing obligation at end of current period		$ 685,000
Specialty Tax Guarantee | Anne Arundel County, Maryland | Tax Incremental Financing Bond
Loss Contingencies [Line Items]
Loan amount				$ 30,000,000

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Commitments and Contingencies - Operating Leases Future Minimum Payments (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2017	$ 320
2018	1,275
2019	1,263
2020	1,257
2021	1,260
Thereafter	85,761
Total	$ 91,136

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Commitments and Contingencies - Capital Leases Future Minimum Payments (Details) $ in Thousands	Sep. 30, 2017 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2017	$ 700
2018	15,775
2020	135
Thereafter	75
Total minimum rental payments	16,685
Less: Amount representing interest	(338)
Capital lease obligation	$ 16,347