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 June 30, 2018

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 July 20, 2018, 103,263,449 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 June 30, 2018 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 June 30, 2018, COPT owned approximately 97.0% of the outstanding common units in COPLP; the remaining common units and all of the outstanding COPLP preferred units 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 two operate as an interrelated, consolidated company. COPT is a REIT 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 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, 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 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, investors 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 4, Fair Value Measurements of COPT and subsidiaries and COPLP and subsidiaries; and

• Note 15, 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 June 30, 2018 and December 31, 2017 (unaudited)	3
	Consolidated Statements of Operations for the Three and Six Months Ended June 30, 2018 and 2017 (unaudited)	4
	Consolidated Statements of Comprehensive Income for the Three and Six Months Ended June 30, 2018 and 2017 (unaudited)	5
	Consolidated Statements of Equity for the Six Months Ended June 30, 2018 and 2017 (unaudited)	6
	Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2018 and 2017 (unaudited)	7
Consolidated Financial Statements of Corporate Office Properties, L.P.
	Consolidated Balance Sheets as of June 30, 2018 and December 31, 2017 (unaudited)	9
	Consolidated Statements of Operations for the Three and Six Months Ended June 30, 2018 and 2017 (unaudited)	10
	Consolidated Statements of Comprehensive Income for the Three and Six Months Ended June 30, 2018 and 2017 (unaudited)	11
	Consolidated Statements of Equity for the Six Months Ended June 30, 2018 and 2017 (unaudited)	12
	Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2018 and 2017 (unaudited)	13
Notes to Consolidated Financial Statements (unaudited)		15
Item 2:	Management’s Discussion and Analysis of Financial Condition and Results of Operations	37
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)

	June 30, 2018			December 31, 2017
Assets
Properties, net:
Operating properties, net	$	2,760,632		$	2,737,611
Projects in development or held for future development	422,905			403,494
Total properties, net	3,183,537			3,141,105
Assets held for sale, net	42,226			42,226
Cash and cash equivalents	8,472			12,261
Investment in unconsolidated real estate joint venture	40,806			41,787
Accounts receivable (net of allowance for doubtful accounts of $811 and $607, respectively)	23,656			31,802
Deferred rent receivable (net of allowance of $423 and $364, respectively)	89,606			86,710
Intangible assets on real estate acquisitions, net	50,586			59,092
Deferred leasing costs (net of accumulated amortization of $29,546 and $29,560, respectively)	48,183			48,322
Investing receivables	54,427			57,493
Prepaid expenses and other assets, net	70,863			74,407
Total assets	$	3,612,362		$	3,595,205
Liabilities and equity
Liabilities:
Debt, net	$	1,871,445		$	1,828,333
Accounts payable and accrued expenses	88,885			108,137
Rents received in advance and security deposits	24,905			25,648
Dividends and distributions payable	29,449			28,921
Deferred revenue associated with operating leases	10,783			11,682
Deferred property sale	43,377			43,377
Capital lease obligation	640			15,853
Other liabilities	9,849			41,822
Total liabilities	2,079,333			2,103,773
Commitments and contingencies (Note 16)
Redeemable noncontrolling interests	24,544			23,125
Equity:
Corporate Office Properties Trust’s shareholders’ equity:
Common Shares of beneficial interest ($0.01 par value; 150,000,000 shares authorized; shares issued and outstanding of 103,260,495 at June 30, 2018 and 101,292,299 at December 31, 2017)	1,033			1,013
Additional paid-in capital	2,254,430			2,201,047
Cumulative distributions in excess of net income	(822,270		)	(802,085		)
Accumulated other comprehensive income	9,012			2,167
Total Corporate Office Properties Trust’s shareholders’ equity	1,442,205			1,402,142
Noncontrolling interests in subsidiaries:
Common units in COPLP	44,651			45,097
Preferred units in COPLP	8,800			8,800
Other consolidated entities	12,829			12,268
Noncontrolling interests in subsidiaries	66,280			66,165
Total equity	1,508,485			1,468,307
Total liabilities, redeemable noncontrolling interests and equity	$	3,612,362		$	3,595,205

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Revenues
Rental revenue	$	101,121		$	101,347		$	201,955		$	201,962
Tenant recoveries and other real estate operations revenue	28,041			26,950			55,485			53,102
Construction contract and other service revenues	17,581			23,138			44,779			36,172
Total revenues	146,743			151,435			302,219			291,236
Expenses
Property operating expenses	49,446			48,628			100,397			97,147
Depreciation and amortization associated with real estate operations	33,190			32,793			66,702			65,852
Construction contract and other service expenses	16,941			22,315			43,157			34,801
Impairment losses	—			1,625			—			1,625
General, administrative and leasing expenses	7,628			7,859			14,920			16,470
Business development expenses and land carry costs	1,234			1,597			2,848			3,290
Total operating expenses	108,439			114,817			228,024			219,185
Operating income	38,304			36,618			74,195			72,051
Interest expense	(18,945		)	(19,163		)	(37,729		)	(38,157		)
Interest and other income	1,439			1,583			2,798			3,309
Loss on early extinguishment of debt	—			(513		)	—			(513		)
Income before equity in income of unconsolidated entities and income taxes	20,798			18,525			39,264			36,690
Equity in income of unconsolidated entities	373			370			746			747
Income tax expense	(63		)	(48		)	(118		)	(88		)
Income before gain on sales of real estate	21,108			18,847			39,892			37,349
Gain on sales of real estate	(23		)	12			(27		)	4,250
Net income	21,085			18,859			39,865			41,599
Net income attributable to noncontrolling interests:
Common units in COPLP	(608		)	(261		)	(1,152		)	(883		)
Preferred units in COPLP	(165		)	(165		)	(330		)	(330		)
Other consolidated entities	(878		)	(907		)	(1,799		)	(1,841		)
Net income attributable to COPT	19,434			17,526			36,584			38,545
Preferred share dividends	—			(3,039		)	—			(6,219		)
Issuance costs associated with redeemed preferred shares	—			(6,847		)	—			(6,847		)
Net income attributable to COPT common shareholders	$	19,434		$	7,640		$	36,584		$	25,479
Earnings per common share:
Net income attributable to COPT common shareholders - basic	$	0.19		$	0.08		$	0.36		$	0.26
Net income attributable to COPT common shareholders - diluted	$	0.19		$	0.08		$	0.36		$	0.26
Dividends declared per common share	$	0.275		$	0.275		$	0.550		$	0.550

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Net income	$	21,085		$	18,859		$	39,865		$	41,599
Other comprehensive income
Unrealized gain (loss) on interest rate derivatives	1,912			(1,800		)	6,588			(1,576		)
(Gain) loss on interest rate derivatives recognized in interest expense	(47		)	941			198			2,125
Equity in other comprehensive income of equity method investee	—			39			—			39
Other comprehensive income (loss)	1,865			(820		)	6,786			588
Comprehensive income	22,950			18,039			46,651			42,187
Comprehensive income attributable to noncontrolling interests	(1,708		)	(1,306		)	(3,498		)	(3,074		)
Comprehensive income attributable to COPT	$	21,242		$	16,733		$	43,153		$	39,113

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 Income (Loss)			Noncontrolling Interests			Total
Balance at December 31, 2016 (98,498,651 common shares outstanding)	$	172,500		$	985	$	2,116,581		$	(747,825	)	$	(1,731	)	$	72,267		$	1,612,777
Redemption of preferred shares (6,900,000 shares)	(172,500		)	—		6,847			(6,847		)	—			—			(172,500		)
Conversion of common units to common shares (187,000 shares)	—			2		2,562			—			—			(2,564		)	—
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 (189,948 shares issued, net of redemptions)	—			2		3,045			—			—			—			3,047
Redemption of vested equity awards	—			—		(1,813		)	—			—			—			(1,813		)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	—			—		(514		)	—			—			514			—
Comprehensive income	—			—		—			38,545			568			1,934			41,047
Dividends	—			—		—			(60,922		)	—			—			(60,922		)
Distributions to owners of common and preferred units in COPLP	—			—		—			—			—			(2,202		)	(2,202		)
Distributions to noncontrolling interests in other consolidated entities	—			—		—			—			—			(2,610		)	(2,610		)
Adjustment to arrive at fair value of redeemable noncontrolling interests	—			—		(401		)	—			—			—			(401		)
Balance at June 30, 2017 (99,471,641 common shares outstanding)	$	—		$	995	$	2,146,119		$	(777,049	)	$	(1,163	)	$	67,339		$	1,436,241
Balance at December 31, 2017 (101,292,299 common shares outstanding)	$	—		$	1,013	$	2,201,047		$	(802,085	)	$	2,167		$	66,165		$	1,468,307
Cumulative effect of accounting change for adoption of hedge accounting guidance	—			—		—			(276		)	276			—			—
Balance at December 31, 2017, as adjusted	—			1,013		2,201,047			(802,361		)	2,443			66,165			1,468,307
Conversion of common units to common shares (53,817 shares)	—			1		760			—			—			(761		)	—
Common shares issued under forward equity sale agreements (1,777,000 shares)	—			18		52,209			—			—			—			52,227
Share-based compensation (137,379 shares issued, net of redemptions)	—			1		3,399			—			—			—			3,400
Redemption of vested equity awards	—			—		(1,525		)	—			—			—			(1,525		)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	—			—		(702		)	—			—			702			—
Comprehensive income	—			—		—			36,584			6,569			2,269			45,422
Dividends	—			—		—			(56,493		)	—			—			(56,493		)
Distributions to owners of common and preferred units in COPLP	—			—		—			—			—			(2,088		)	(2,088		)
Distributions to noncontrolling interests in other consolidated entities	—			—		—			—			—			(7		)	(7		)
Adjustment to arrive at fair value of redeemable noncontrolling interests	—			—		(758		)	—			—			—			(758		)
Balance at June 30, 2018 (103,260,495 common shares outstanding)	$	—		$	1,033	$	2,254,430		$	(822,270	)	$	9,012		$	66,280		$	1,508,485

See accompanying notes to consolidated financial statements.

6

Corporate Office Properties Trust and Subsidiaries

Consolidated Statements of Cash Flows

(in thousands)

(unaudited)

	For the Six Months Ended June 30,
	2018			2017
Cash flows from operating activities
Revenues from real estate operations received	$	262,602		$	254,392
Construction contract and other service revenues received	18,411			39,917
Property operating expenses paid	(83,642		)	(79,683		)
Construction contract and other service expenses paid	(62,624		)	(31,996		)
General, administrative, leasing, business development and land carry costs paid	(15,148		)	(20,315		)
Interest expense paid	(36,155		)	(36,351		)
Lease incentives paid	(4,825		)	(9,375		)
Other	2,093			940
Net cash provided by operating activities	80,712			117,529
Cash flows from investing activities
Construction, development and redevelopment	(67,749		)	(85,926		)
Tenant improvements on operating properties	(18,352		)	(13,711		)
Other capital improvements on operating properties	(8,584		)	(11,780		)
Proceeds from dispositions of properties	—			54,798
Leasing costs paid	(3,838		)	(3,904		)
Other	1,715			1,746
Net cash used in investing activities	(96,808		)	(58,777		)
Cash flows from financing activities
Proceeds from debt
Revolving Credit Facility	153,000			213,000
Repayments of debt
Revolving Credit Facility	(109,000		)	(19,000		)
Scheduled principal amortization	(2,101		)	(2,013		)
Other debt repayments	—			(200,000		)
Payments on capital lease obligation	(15,379		)	—
Net proceeds from issuance of common shares	52,277			19,835
Redemption of preferred shares	—			(199,083		)
Common share dividends paid	(55,950		)	(54,439		)
Preferred share dividends paid	—			(9,305		)
Distributions paid to noncontrolling interests in COPLP	(2,110		)	(2,274		)
Redemption of vested equity awards	(1,525		)	(1,813		)
Other	(5,370		)	(2,952		)
Net cash provided by (used in) financing activities	13,842			(258,044		)
Net decrease in cash and cash equivalents and restricted cash	(2,254		)	(199,292		)
Cash and cash equivalents and restricted cash
Beginning of period	14,831			212,619
End of period	$	12,577		$	13,327

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 Six Months Ended June 30,
	2018			2017
Reconciliation of net income to net cash provided by operating activities:
Net income	$	39,865		$	41,599
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	67,684			66,948
Impairment losses	—			1,618
Amortization of deferred financing costs and net debt discounts	1,648			2,613
(Increase) decrease in deferred rent receivable	(3,470		)	669
Gain on sales of real estate	27			(4,250		)
Share-based compensation	3,132			2,820
Other	(777		)	(1,861		)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	8,050			(8,304		)
Decrease in prepaid expenses and other assets, net	14,718			22,418
Decrease in accounts payable, accrued expenses and other liabilities	(49,422		)	(2,387		)
Decrease in rents received in advance and security deposits	(743		)	(4,354		)
Net cash provided by operating activities	$	80,712		$	117,529
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents at beginning of period	$	12,261		$	209,863
Restricted cash at beginning of period	2,570			2,756
Cash and cash equivalents and restricted cash at beginning of period	$	14,831		$	212,619
Cash and cash equivalents at end of period	$	8,472		$	10,606
Restricted cash at end of period	4,105			2,721
Cash and cash equivalents and restricted cash at end of period	$	12,577		$	13,327
Supplemental schedule of non-cash investing and financing activities:
Increase (decrease) in accrued capital improvements, leasing and other investing activity costs	$	2,909		$	(4,927	)
Increase in property in connection with capital lease obligation	$	—		$	16,127
Increase in fair value of derivatives applied to accumulated other comprehensive income and noncontrolling interests	$	6,719		$	513
Equity in other comprehensive income of an equity method investee	$	—		$	39
Dividends/distributions payable	$	29,449		$	28,462
Decrease in noncontrolling interests and increase in shareholders’ equity in connection with the conversion of common units into common shares	$	761		$	2,564
Adjustments to noncontrolling interests resulting from changes in COPLP ownership	$	702		$	514
Increase in redeemable noncontrolling interests and decrease in equity to carry redeemable noncontrolling interests at fair value	$	758		$	401

See accompanying notes to consolidated financial statements.

8

Corporate Office Properties, L.P. and Subsidiaries

Consolidated Balance Sheets

(in thousands, except unit data)

(unaudited)

	June 30, 2018		December 31, 2017
Assets
Properties, net:
Operating properties, net	$	2,760,632	$	2,737,611
Projects in development or held for future development	422,905		403,494
Total properties, net	3,183,537		3,141,105
Assets held for sale, net	42,226		42,226
Cash and cash equivalents	8,472		12,261
Investment in unconsolidated real estate joint venture	40,806		41,787
Accounts receivable (net of allowance for doubtful accounts of $811 and $607, respectively)	23,656		31,802
Deferred rent receivable (net of allowance of $423 and $364, respectively)	89,606		86,710
Intangible assets on real estate acquisitions, net	50,586		59,092
Deferred leasing costs (net of accumulated amortization of $29,546 and $29,560, respectively)	48,183		48,322
Investing receivables	54,427		57,493
Prepaid expenses and other assets, net	66,669		69,791
Total assets	$	3,608,168	$	3,590,589
Liabilities and equity
Liabilities:
Debt, net	$	1,871,445	$	1,828,333
Accounts payable and accrued expenses	88,885		108,137
Rents received in advance and security deposits	24,905		25,648
Distributions payable	29,449		28,921
Deferred revenue associated with operating leases	10,783		11,682
Deferred property sale	43,377		43,377
Capital lease obligation	640		15,853
Other liabilities	5,655		37,206
Total liabilities	2,075,139		2,099,157
Commitments and contingencies (Note 16)
Redeemable noncontrolling interests	24,544		23,125
Equity:
Corporate Office Properties, L.P.’s equity:
Preferred units held by limited partner, 352,000 preferred units outstanding at June 30, 2018 and December 31, 2017	8,800		8,800
Common units, 103,260,495 and 101,292,299 held by the general partner and 3,197,061 and 3,250,878 held by limited partners at June 30, 2018 and December 31, 2017, respectively	1,477,575		1,445,022
Accumulated other comprehensive income	9,235		2,173
Total Corporate Office Properties, L.P.’s equity	1,495,610		1,455,995
Noncontrolling interests in subsidiaries	12,875		12,312
Total equity	1,508,485		1,468,307
Total liabilities, redeemable noncontrolling interests and equity	$	3,608,168	$	3,590,589

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Revenues
Rental revenue	$	101,121		$	101,347		$	201,955		$	201,962
Tenant recoveries and other real estate operations revenue	28,041			26,950			55,485			53,102
Construction contract and other service revenues	17,581			23,138			44,779			36,172
Total revenues	146,743			151,435			302,219			291,236
Expenses
Property operating expenses	49,446			48,628			100,397			97,147
Depreciation and amortization associated with real estate operations	33,190			32,793			66,702			65,852
Construction contract and other service expenses	16,941			22,315			43,157			34,801
Impairment losses	—			1,625			—			1,625
General, administrative and leasing expenses	7,628			7,859			14,920			16,470
Business development expenses and land carry costs	1,234			1,597			2,848			3,290
Total operating expenses	108,439			114,817			228,024			219,185
Operating income	38,304			36,618			74,195			72,051
Interest expense	(18,945		)	(19,163		)	(37,729		)	(38,157		)
Interest and other income	1,439			1,583			2,798			3,309
Loss on early extinguishment of debt	—			(513		)	—			(513		)
Income before equity in income of unconsolidated entities and income taxes	20,798			18,525			39,264			36,690
Equity in income of unconsolidated entities	373			370			746			747
Income tax expense	(63		)	(48		)	(118		)	(88		)
Income before gain on sales of real estate	21,108			18,847			39,892			37,349
Gain on sales of real estate	(23		)	12			(27		)	4,250
Net income	21,085			18,859			39,865			41,599
Net income attributable to noncontrolling interests in consolidated entities	(878		)	(907		)	(1,799		)	(1,841		)
Net income attributable to COPLP	20,207			17,952			38,066			39,758
Preferred unit distributions	(165		)	(3,204		)	(330		)	(6,549		)
Issuance costs associated with redeemed preferred units	—			(6,847		)	—			(6,847		)
Net income attributable to COPLP common unitholders	$	20,042		$	7,901		$	37,736		$	26,362
Earnings per common unit:
Net income attributable to COPLP common unitholders - basic	$	0.19		$	0.08		$	0.36		$	0.26
Net income attributable to COPLP common unitholders - diluted	$	0.19		$	0.08		$	0.36		$	0.26
Distributions declared per common unit	$	0.275		$	0.275		$	0.550		$	0.550

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Net income	$	21,085		$	18,859		$	39,865		$	41,599
Other comprehensive income
Unrealized gain (loss) on interest rate derivatives	1,912			(1,800		)	6,588			(1,576		)
(Gain) loss on interest rate derivatives recognized in interest expense	(47		)	941			198			2,125
Equity in other comprehensive income of equity method investee	—			39			—			39
Other comprehensive income (loss)	1,865			(820		)	6,786			588
Comprehensive income	22,950			18,039			46,651			42,187
Comprehensive income attributable to noncontrolling interests	(878		)	(907		)	(1,799		)	(1,841		)
Comprehensive income attributable to COPLP	$	22,072		$	17,132		$	44,852		$	40,346

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, 2016	352,000	$	8,800		6,900,000		$	172,500		102,089,042	$	1,419,710		$	(1,854	)	$	13,621		$	1,612,777
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)	—	—			—		—			189,948	3,047			—			—			3,047
Redemptions of vested equity awards	—	—			—		—			—	(1,813		)	—			—			(1,813		)
Comprehensive income	—	330			—		6,219			—	33,209			588			701			41,047
Distributions to owners of common and preferred units	—	(330		)	—		(6,219		)	—	(56,575		)	—			—			(63,124		)
Distributions to noncontrolling interests in subsidiaries	—	—			—		—			—	—			—			(2,610		)	(2,610		)
Adjustment to arrive at fair value of redeemable noncontrolling interests	—	—			—		—			—	(401		)	—			—			(401		)
Balance at June 30, 2017	352,000	$	8,800		—		$	—		102,875,032	$	1,416,995		$	(1,266	)	$	11,712		$	1,436,241
Balance at December 31, 2017	352,000	$	8,800		—		$	—		104,543,177	$	1,445,022		$	2,173		$	12,312		$	1,468,307
Cumulative effect of accounting change for adoption of hedge accounting guidance	—	—			—		—			—	(276		)	276			—			—
Balance at December 31, 2017, as adjusted	352,000	8,800			—		—			104,543,177	1,444,746			2,449			12,312			1,468,307
Issuance of common units resulting from common shares issued under COPT forward equity sale agreements	—	—			—		—			1,777,000	52,227			—			—			52,227
Share-based compensation (units net of redemption)	—	—			—		—			137,379	3,400			—			—			3,400
Redemptions of vested equity awards	—	—			—		—			—	(1,525		)	—			—			(1,525		)
Comprehensive income	—	330			—		—			—	37,736			6,786			570			45,422
Distributions to owners of common and preferred units	—	(330		)	—		—			—	(58,251		)	—			—			(58,581		)
Distributions to noncontrolling interests in subsidiaries	—	—			—		—			—	—			—			(7		)	(7		)
Adjustment to arrive at fair value of redeemable noncontrolling interests	—	—			—		—			—	(758		)	—			—			(758		)
Balance at June 30, 2018	352,000	$	8,800		—		$	—		106,457,556	$	1,477,575		$	9,235		$	12,875		$	1,508,485

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 Six Months Ended June 30,
	2018			2017
Cash flows from operating activities
Revenues from real estate operations received	$	262,602		$	254,392
Construction contract and other service revenues received	18,411			39,917
Property operating expenses paid	(83,642		)	(79,683		)
Construction contract and other service expenses paid	(62,624		)	(31,996		)
General, administrative, leasing, business development and land carry costs paid	(15,148		)	(20,315		)
Interest expense paid	(36,155		)	(36,351		)
Lease incentives paid	(4,825		)	(9,375		)
Other	2,093			940
Net cash provided by operating activities	80,712			117,529
Cash flows from investing activities
Construction, development and redevelopment	(67,749		)	(85,926		)
Tenant improvements on operating properties	(18,352		)	(13,711		)
Other capital improvements on operating properties	(8,584		)	(11,780		)
Proceeds from dispositions of properties	—			54,798
Leasing costs paid	(3,838		)	(3,904		)
Other	1,715			1,746
Net cash used in investing activities	(96,808		)	(58,777		)
Cash flows from financing activities
Proceeds from debt
Revolving Credit Facility	153,000			213,000
Repayments of debt
Revolving Credit Facility	(109,000		)	(19,000		)
Scheduled principal amortization	(2,101		)	(2,013		)
Other debt repayments	—			(200,000		)
Payments on capital lease obligation	(15,379		)	—
Net proceeds from issuance of common units	52,277			19,835
Redemption of preferred units	—			(199,083		)
Common unit distributions paid	(57,730		)	(56,383		)
Preferred unit distributions paid	(330		)	(9,635		)
Redemption of vested equity awards	(1,525		)	(1,813		)
Other	(5,370		)	(2,952		)
Net cash provided by (used in) financing activities	13,842			(258,044		)
Net decrease in cash and cash equivalents and restricted cash	(2,254		)	(199,292		)
Cash and cash equivalents and restricted cash
Beginning of period	14,831			212,619
End of period	$	12,577		$	13,327

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 Six Months Ended June 30,
	2018			2017
Reconciliation of net income to net cash provided by operating activities:
Net income	$	39,865		$	41,599
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	67,684			66,948
Impairment losses	—			1,618
Amortization of deferred financing costs and net debt discounts	1,648			2,613
(Increase) decrease in deferred rent receivable	(3,470		)	669
Gain on sales of real estate	27			(4,250		)
Share-based compensation	3,132			2,820
Other	(777		)	(1,861		)
Operating changes in assets and liabilities:
Decrease (increase) in accounts receivable	8,050			(8,304		)
Decrease in prepaid expenses and other assets, net	14,296			21,126
Decrease in accounts payable, accrued expenses and other liabilities	(49,000		)	(1,095		)
Decrease in rents received in advance and security deposits	(743		)	(4,354		)
Net cash provided by operating activities	$	80,712		$	117,529
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents at beginning of period	$	12,261		$	209,863
Restricted cash at beginning of period	2,570			2,756
Cash and cash equivalents and restricted cash at beginning of period	$	14,831		$	212,619
Cash and cash equivalents at end of period	$	8,472		$	10,606
Restricted cash at end of period	4,105			2,721
Cash and cash equivalents and restricted cash at end of period	$	12,577		$	13,327
Supplemental schedule of non-cash investing and financing activities:
Increase (decrease) in accrued capital improvements, leasing and other investing activity costs	$	2,909		$	(4,927	)
Increase in property in connection with capital lease obligation	$	—		$	16,127
Increase in fair value of derivatives applied to accumulated other comprehensive income and noncontrolling interests	$	6,719		$	513
Equity in other comprehensive income of an equity method investee	$	—		$	39
Distributions payable	$	29,449		$	28,462
Increase in redeemable noncontrolling interests and decrease in equity to carry redeemable noncontrolling interests at fair value	$	758		$	401

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 in the Greater Washington, DC/Baltimore region

with durable Class-A office fundamentals and characteristics (“Regional Office”). As of June 30, 2018, our properties included the following:

• 159 properties totaling 17.7 million square feet comprised of 143 office properties and 16 single-tenant data center shell properties (“data center shells”). We owned six of these data center shells through an unconsolidated real estate joint venture;

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

• nine properties under construction or redevelopment (five office properties and four data center shells) that we estimate will total approximately 1.0 million square feet upon completion, including one partially-operational property; and

• approximately 1,000 acres of land controlled for future development that we believe could be developed into approximately 12.3 million square feet and 150 acres of other land.

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 June 30, 2018, COPT owned 97.0% of the outstanding COPLP common units (“common units”); the remaining common units and all of the outstanding COPLP preferred units (“preferred units”) were owned by third parties. Common units not owned by COPT carry certain redemption rights. The number of common units owned by COPT is equivalent to the number of outstanding common shares of beneficial interest (“common shares”) of COPT, and the entitlement of all 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 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; similarly, although 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, 2017 included in our 2017 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 2017 Annual Report on Form 10-K as updated for our adoption of recent accounting pronouncements discussed below.

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, including restricted cash and marketable securities that were reclassified to the line entitled “prepaid expenses and other assets, net” on our consolidated balance sheets after having been reported on a separate line in our Quarterly Reports on Form 10-Q filed in prior years and previous Annual Reports on Form 10-K.

Recent Accounting Pronouncements

We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) effective January 1, 2018 regarding the recognition of revenue from contracts with customers (“Topic 606”). Under this guidance, an entity recognizes 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 determined that Topic 606 is applicable to our construction contract and other service revenues, which includes predominantly construction and design projects performed primarily for tenants of our properties. We used the modified retrospective method for contracts that were not completed as of January 1, 2018. Under this method, the cumulative effect of initially applying the guidance is recognized as an adjustment to the opening balance of retained earnings as of the date of initial application. Our adoption of Topic 606 effective January 1, 2018 did not affect our consolidated financial statements other than additional disclosure provided in accordance with the guidance. We did not elect to use any of the practical expedients provided for under the guidance. 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, Topic 606 may 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).

We adopted guidance issued by the FASB effective January 1, 2018 that requires entities to measure equity investments at fair value through net income, except for those that result in consolidation or are accounted for under the equity method of accounting. For equity investments without readily determinable fair values, the guidance permits the application of a measurement alternative using the cost of the investment, less any impairments, plus or minus changes resulting from observable price changes for an identical or similar investment of the same issuer. Our adoption of this guidance had no effect on our consolidated financial statements.

We adopted guidance issued by the FASB retrospectively effective January 1, 2018 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. Our adoption of this guidance had no effect on our consolidated financial statements.

16

We adopted guidance issued by the FASB retrospectively effective January 1, 2018 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.  As a result of our adoption of this guidance, the change in restricted cash is no longer reported as either operating or investing activities on our statements of cash flows. Our restricted cash primarily consists of cash escrowed under mortgage debt for capital improvements and real estate taxes and certain tenant security deposits. Our adoption of this guidance had the following effects on our consolidated statements of cash flows for the six months ended June 30, 2017 (in thousands):

	As Previously Reported			Impact of Adoption			As Adjusted
Net cash provided by operating activities	$	117,737		$	(208	)	$	117,529
Net cash used in investing activities	$	(58,950	)	$	173		$	(58,777	)
Net decrease in cash and cash equivalents and restricted cash	$	(199,257	)	$	(35	)	$	(199,292	)
Beginning of period cash and cash equivalents and restricted cash	$	209,863		$	2,756		$	212,619
End of period cash and cash equivalents and restricted cash	$	10,606		$	2,721		$	13,327

We adopted guidance issued by the FASB that clarifies the scope of provisions and accounting for nonfinancial asset derecognition, including partial sales of real estate assets, effective January 1, 2018 using the full retrospective method. 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 nonfinancial 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 are now subject to the same derecognition model as all other nonfinancial assets. We had a transaction in July 2016 accounted for as a partial sale under the previous guidance that meets the criteria for immediate full gain recognition under the new guidance; as a result, we retrospectively recognized an additional $18 million in income in 2016 that was being amortized into income in subsequent periods under the previous guidance. The recognition pattern for our other sales of real estate were not changed by this new guidance. The full retrospective method requires adjustment of each reporting period presented at the time of adoption.

17

The tables below set forth the impact of the adoption of this guidance for amounts previously reported on the consolidated financial statements of COPT and subsidiaries (in thousands):

	As of December 31, 2017								As of June 30, 2017								As of December 31, 2016
Consolidated Balance Sheets	As Previously Reported			Impact of Adoption		As Adjusted			As Previously Reported			Impact of Adoption		As Adjusted			As Previously Reported			Impact of Adoption		As Adjusted
Investment in unconsolidated real estate joint venture	$	25,066		$	16,721	$	41,787		$	25,335		$	17,417	$	42,752		$	25,548		$	18,113	$	43,661
Cumulative distributions in excess of net income	$	(818,190	)	$	16,105	$	(802,085	)	$	(793,828	)	$	16,779	$	(777,049	)	$	(765,276	)	$	17,451	$	(747,825	)
Noncontrolling interests in subsidiaries	$	65,549		$	616	$	66,165		$	66,701		$	638	$	67,339		$	71,605		$	662	$	72,267

	For the Three Months Ended June 30, 2017									For the Six Months Ended June 30, 2017
Consolidated Statements of Operations and Comprehensive Income	As Previously Reported			Impact of Adoption			As Adjusted			As Previously Reported			Impact of Adoption			As Adjusted
Equity in income of unconsolidated entities	$	718		$	(348	)	$	370		$	1,443		$	(696	)	$	747
Income before gain on sales of real estate	$	19,195		$	(348	)	$	18,847		$	38,045		$	(696	)	$	37,349
Net income	$	19,207		$	(348	)	$	18,859		$	42,295		$	(696	)	$	41,599
Net income attributable to noncontrolling interests - Common units in COPLP	$	(273	)	$	12		$	(261	)	$	(907	)	$	24		$	(883	)
Net income attributable to COPT	$	17,862		$	(336	)	$	17,526		$	39,217		$	(672	)	$	38,545
Net income attributable to COPT common shareholders	$	7,976		$	(336	)	$	7,640		$	26,151		$	(672	)	$	25,479
Comprehensive income	$	18,387		$	(348	)	$	18,039		$	42,883		$	(696	)	$	42,187
Comprehensive income attributable to COPT	$	17,069		$	(336	)	$	16,733		$	39,785		$	(672	)	$	39,113

The tables below set forth the impact of the adoption of this guidance for amounts previously reported on the consolidated financial statements of COPLP and subsidiaries (in thousands):

	As of December 31, 2017						As of June 30, 2017						As of December 31, 2016
Consolidated Balance Sheets	As Previously Reported		Impact of Adoption		As Adjusted		As Previously Reported		Impact of Adoption		As Adjusted		As Previously Reported		Impact of Adoption		As Adjusted
Investment in unconsolid. real estate joint venture	$	25,066	$	16,721	$	41,787	$	25,335	$	17,417	$	42,752	$	25,548	$	18,113	$	43,661
Common units	$	1,428,301	$	16,721	$	1,445,022	$	1,399,578	$	17,417	$	1,416,995	$	1,401,597	$	18,113	$	1,419,710

	For the Three Months Ended June 30, 2017							For the Six Months Ended June 30, 2017
Consolidated Statements of Operations and Comprehensive Income	As Previously Reported		Impact of Adoption			As Adjusted		As Previously Reported		Impact of Adoption			As Adjusted
Equity in income of unconsolidated entities	$	718	$	(348	)	$	370	$	1,443	$	(696	)	$	747
Income before gain on sales of real estate	$	19,195	$	(348	)	$	18,847	$	38,045	$	(696	)	$	37,349
Net income	$	19,207	$	(348	)	$	18,859	$	42,295	$	(696	)	$	41,599
Net income attributable to COPLP	$	18,300	$	(348	)	$	17,952	$	40,454	$	(696	)	$	39,758
Net income attributable to COPLP common unitholders	$	8,249	$	(348	)	$	7,901	$	27,058	$	(696	)	$	26,362
Comprehensive income	$	18,387	$	(348	)	$	18,039	$	42,883	$	(696	)	$	42,187
Comprehensive income attributable to COPLP	$	17,480	$	(348	)	$	17,132	$	41,042	$	(696	)	$	40,346

Adoption of this guidance had no impact to cash provided by or used in operating, financing or investing activities on our consolidated statements of cash flows for the six months ended June 30, 2017.

18

We early adopted guidance issued by the FASB effective January 1, 2018 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. We adopted this guidance using the modified retrospective transition method under which we eliminated $276,000 in previously-recorded cumulative hedge ineffectiveness as of January 1, 2018 by means of a cumulative-effect adjustment to our beginning balance of accumulated other comprehensive income (“AOCI”), with a corresponding adjustment to the beginning balance of: cumulative distributions in excess of net income for COPT and subsidiaries; and common units for COPLP and subsidiaries.

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 2017 Annual Report on Form 10-K for amounts deferred in 2017, 2016 and 2015). 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: Under the issued and approved guidance, we believed that the new revenue standard would apply to executory costs and other components of revenue deemed to be non-lease components (such as common area maintenance and provision of utilities), in which case we would need: to separate the lease components of revenue due under leases from the non-lease components; and recognize revenue on the non-lease components as the related services are delivered, which could result in a change to our revenue recognition pattern. However, in March 2018, the FASB tentatively approved a practical expedient to provide lessors with an option to not separate lease components of revenue from non-lease components if: the timing and pattern of transfer of these components is the same as the related lease; and the lease would continue to be classified as an operating lease.

• Leases in which we are the lessee:

◦ Our most significant leases as lessee are ground leases; as of June 30, 2018, our future minimum rental payments under these leases totaled $89.4 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 right-of-use assets and lease liabilities 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, we expect to elect to apply the package of practical expedients under which we would 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,

19

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.

3.Revenue Recognition on Construction Contract and Other Service Revenues

We enter into construction contracts to complete various design and construction services primarily for our United States Government tenants. The revenues and expenses from these services consist primarily of subcontracted costs that are reimbursed to us by our customers along with a fee. These services are an ancillary component of our overall operations, with small operating margins relative to the revenue. We review each contract to determine the performance obligations and allocate the transaction price. We recognize revenue under these contracts as services are performed in an amount that reflects the consideration we expect to receive in exchange for those services. Our performance obligations are satisfied over time as work progresses. Revenue recognition is determined using the input method based on costs incurred as of point in time relative to the total estimated costs at completion to measure progress toward satisfying our performance obligations. We believe incurred costs of work performed best depicts the transfer of control of the services being transferred to the customer.

In determining whether the performance obligations of each construction contract should be accounted for separately versus together, we consider numerous factors that may require significant judgment, including: whether the components contracted are substantially the same with the same pattern of transfer; whether the customer could contract with another party to perform construction based on our design project; and whether the customer can elect not to move forward after the design phase of the contract. Most of our contracts have a single performance obligation as the promise to transfer the services is not separately identifiable from other obligations in the contracts and, therefore, are not distinct. Some contracts have multiple performance obligations, most commonly due to having distinct project phases for design and construction for which our customer is making decisions and managing separately. In these cases, we allocate the transaction price between these performance obligations based on the amounts separately set forth in the contracts for such obligations. Contract modifications, such as change orders, are routine for our construction contracts and are generally determined to be additions to the existing performance obligations because they would have been part of the initial performance obligations if they were identified at the initial contract date.

We have three main types of compensation arrangements for our construction contracts: guaranteed maximum price (“GMP”); firm fixed price (“FFP”); and cost-plus fee.

• GMP contracts provide for revenue equal to costs incurred plus a fee equal to a percentage of such costs, up to a maximum contract amount. We generally enter into GMP contracts for projects that are significant in nature based on the size of the project and total fees, and for which the full scope of the project has not been determined as of the contract date. GMP contracts are lower risk to us than FFP contracts since the costs and revenue move proportionately to one another;

• FFP contracts provide for revenue equal to a fixed fee. These contracts are typically lower in value and scope relative to GMP contracts, and are generally entered into when the scope of the project is well defined. Typically, we assume more risk with FFP contracts than GMP contracts since the revenue is fixed and we could realize losses or less than expected profits if we incur more costs than originally estimated. However, these types of contracts offer the opportunity for additional profits when we complete the work for less than originally estimated. Determining the estimated total costs for contracts under an FFP compensation arrangement may require significant judgment and has a direct effect on our revenue recognition pattern;

• Cost-plus fee contracts provide for revenue equal to costs incurred plus a fee equal to a percentage of such costs but, unlike GMP contracts, do not have a maximum contract amount. We do not frequently enter into cost-plus fee contracts. Similar to GMP contracts, cost-plus fee contracts are low risk to us since the costs and revenue move proportionately to one another.

Construction contract cost estimates are based on various assumptions, such as performance of subcontractors and cost and availability of materials, to project the outcome of future events over the course of the project. We review and update these estimates regularly as a significant change could affect the profitability of our construction contracts. We recognize adjustments in estimated profit on contracts under the cumulative catch-up method as the modification does not create a new performance obligation. Under this method, the impact of the adjustment on profit recorded to date on a contract is recognized in the period the adjustment is identified. Revenue and profit in future periods are recognized using the adjusted estimate. If at any time the estimate of contract profitability indicates an anticipated loss on the contract, we recognize the total loss in the quarter it is identified.

20

We disaggregate our construction contract and other service revenues by compensation arrangement and by service type as we believe it best depicts the nature, timing and uncertainty of our revenue. The table below reports construction contract and other service revenues by compensation arrangement (in thousands):

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2018		2017		2018		2017
Construction contract revenues:
GMP	$	9,539	$	18,317	$	30,025	$	24,906
FFP	6,288		4,587		12,723		10,785
Cost-plus fee	1,496		—		1,554		17
Other	258		234		477		464
	$	17,581	$	23,138	$	44,779	$	36,172

The table below reports construction contract and other service revenues by service type (in thousands):

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2018		2017		2018		2017
Construction contract revenues:
Construction	$	16,668	$	21,078	$	42,583	$	31,169
Design	655		1,826		1,719		4,539
Other	258		234		477		464
	$	17,581	$	23,138	$	44,779	$	36,172

We recognized revenue from performance obligations satisfied (or partially satisfied) in previous periods of $10,000 and $401,000 in the three months endedJune 30, 2018 and 2017, respectively; and $319,000 and $547,000 in the six months endedJune 30, 2018 and 2017, respectively.

Our timing of revenue recognition for construction contracts generally differs from the timing of invoicing to customers. We recognize such revenue as we satisfy our performance obligations. Payment terms and conditions vary by contract type. Under most of our contracts, we bill customers monthly, as work progresses, in accordance with the contract terms, with payment due in 30 days, although customers occasionally pay in advance of services being provided. We have determined that our contracts generally do not include a significant financing component. The primary purpose of the timing of our invoicing is for convenience, not to receive financing from our customers or to provide customers with financing. Additionally, the timing of transfer of the services is often at the discretion of the customer. We recognized no impairment losses on construction contracts receivable or unbilled construction revenue in the periods set forth herein.

Accounts receivable related to our construction contract services is included in accounts receivable, net on our consolidated balance sheets. The beginning and ending balances of accounts receivable related to our construction contracts were as follows (in thousands):

	For the Six Months Ended June 30,
	2018		2017
Beginning balance	$	4,577	$	4,131
Ending balance	$	4,805	$	11,946

Under most of our contracts, we bill customers one month subsequent to revenue recognition, resulting in contract assets representing unbilled construction revenue. Contract assets, which we refer to herein as construction costs in excess of billings, are included in prepaid expenses and other assets, net reported on our consolidated balance sheets. The beginning and ending balances of our contract assets were as follows (in thousands):

	For the Six Months Ended June 30,
	2018		2017
Beginning balance	$	4,884	$	10,350
Ending balance	$	4,158	$	3,620

21

Our contract liabilities consist of advance payments from our customers or billings in excess of construction contract revenue recognized. Contract liabilities are included in other liabilities reported on our consolidated balance sheets. Changes in contract liabilities were as follows (in thousands):

	For the Six Months Ended June 30,
	2018		2017
Beginning balance	$	27,402	$	32,650
Ending balance	$	515	$	40,209
Portion of beginning balance recognized in revenue during:
Three months ended June 30	$	7,999	$	16,762
Six months ended June 30	$	27,296	$	20,961

The change in the contract liabilities balance reported above for the six months endedJune 30, 2018 was due primarily to our satisfaction of performance obligations during the period on a contract on which we previously received advance payments from a customer.

Revenue allocated to the remaining performance obligations under existing contracts as of June 30, 2018 that will be recognized as revenue in future periods was $16.1 million, virtually all of which we expect to recognize during the remainder of 2018.

We have no deferred incremental costs incurred to obtain or fulfill our construction contracts or other service revenues.

4.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 sheets using quoted market prices, as are other marketable securities that we hold. The balance of the plan, which was fully funded, totaled $4.2 million as of June 30, 2018, and is included in the line entitled “prepaid expenses and other assets, net” on COPT’s consolidated balance sheets. 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 are classified in Level 1 of the fair value hierarchy, while the offsetting liability 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 June 30, 2018, 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 7, 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 9, 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

22

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 7 for investing receivables, Note 9 for debt and Note 10 for interest rate derivatives. 

COPT and Subsidiaries

The table below sets forth financial assets and liabilities of COPT and subsidiaries that are accounted for at fair value on a recurring basis as of June 30, 2018 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	$	4,146	$	—	$	—	$	4,146
Other	48		—		—		48
Interest rate derivatives (1)	—		9,792		—		9,792
Total assets	$	4,194	$	9,792	$	—	$	13,986
Liabilities:
Deferred compensation plan liability (2)	$	—	$	4,194	$	—	$	4,194

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

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

COPLP and Subsidiaries

The table below sets forth financial assets and liabilities of COPLP and subsidiaries that are accounted for at fair value on a recurring basis as of June 30, 2018 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)	$	—	$	9,792	$	—	$	9,792

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

5.Properties, Net

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

	June 30, 2018			December 31, 2017
Land	$	469,494		$	455,680
Buildings and improvements	3,130,616			3,068,124
Less: Accumulated depreciation	(839,478		)	(786,193		)
Operating properties, net	$	2,760,632		$	2,737,611

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

	June 30, 2018		December 31, 2017
Land	$	232,758	$	240,825
Development in progress, excluding land	190,147		162,669
Projects in development or held for future development	$	422,905	$	403,494

23

Our property held for sale is 11751 Meadowville Lane, a property in our Data Center Shells sub-segment, the sale of which was not recognized for accounting purposes. We provided a financial guaranty to the buyer under which we provided an indemnification 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. We account for this transaction as a financing arrangement. Accordingly, we did not recognize the sale of this property for accounting purposes (and will not until the guaranty expires) and we reported the sales proceeds as a liability on the consolidated balance sheets as of June 30, 2018 and December 31, 2017 in the line entitled “deferred property sale.” We do not expect to incur any losses under this financial guaranty. The table below sets forth the components of this property’s assets as of June 30, 2018 and December 31, 2017 (in thousands):

Properties, net	$	38,670
Deferred rent receivable	3,237
Deferred leasing costs, net	319
Assets held for sale, net	$	42,226

2018 Construction Activities

During the six months endedJune 30, 2018, we placed into service 223,000 square feet in two newly-constructed properties and 13,000 square feet in one redeveloped property. As of June 30, 2018, we had seven properties under construction, or which we were contractually committed to construct, that we estimate will total 880,000 square feet upon completion and two properties under redevelopment (including one partially-operational property) that we estimate will total 128,000 square feet upon completion.

6.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 June 30, 2018 (dollars in thousands):

		Nominal
		Ownership		June 30, 2018 (1)
	Date	% as of		Total		Encumbered		Total
	Acquired	6/30/2018	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	159,805	$	74,012	$	51,157
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	73,395		44,457		46,323
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	75,813		—		4,887
				$	309,013	$	118,469	$	102,367

(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.

Unconsolidated Joint Venture

As of June 30, 2018, 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 shell properties in Virginia, that we account for using the equity method of accounting. As of June 30, 2018, we had an investment balance in GI-COPT of $40.8 million.

7.    Investing Receivables

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

	June 30, 2018		December 31, 2017
Notes receivable from the City of Huntsville	$	51,386	$	54,472
Other investing loans receivable	3,041		3,021
	$	54,427	$	57,493

24

Our notes receivable from the City of Huntsville funded infrastructure costs in connection with our LW Redstone Company, LLC joint venture (see Note 6) and carry an interest rate of 9.95%.

We did not have an allowance for credit losses in connection with our investing receivables as of June 30, 2018 or December 31, 2017.  The fair value of these receivables approximated their carrying amounts as of June 30, 2018 and December 31, 2017.

8.    Prepaid Expenses and Other Assets, Net

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

	June 30, 2018		December 31, 2017
Lease incentives, net	$	18,376	$	19,011
Prepaid expenses	12,173		24,670
Interest rate derivatives	9,792		3,073
Furniture, fixtures and equipment, net	6,407		5,256
Non-real estate equity investments	5,076		5,056
Marketable securities in deferred compensation plan	4,194		4,616
Construction contract costs incurred in excess of billings	4,158		4,884
Restricted cash	4,105		2,570
Deferred tax asset, net (1)	1,774		1,892
Other assets	4,808		3,379
Prepaid expenses and other assets, net	$	70,863	$	74,407

(1) Includes a valuation allowance of $1.4 million.

25

9.    Debt, Net

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

	Carrying Value (1) as of
	June 30, 2018		December 31, 2017		Stated Interest Rates as of	Scheduled Maturity as of
					June 30, 2018	June 30, 2018
Mortgage and Other Secured Debt:
Fixed rate mortgage debt (2)	$	148,950	$	150,723	3.82% - 7.87% (3)	2019-2026
Variable rate secured debt	12,943		13,115		LIBOR + 1.85% (4)	October 2020
Total mortgage and other secured debt	161,893		163,838
Revolving Credit Facility	170,000		126,000		LIBOR + 0.875% to 1.60% (5)	May 2019 (6)
Term Loan Facilities (7)	348,185		347,959		LIBOR + 0.90% to 1.85% (8)	2020-2022
Unsecured Senior Notes
3.600%, $350,000 aggregate principal	347,767		347,551		3.60% (9)	May 2023
5.250%, $250,000 aggregate principal	246,887		246,645		5.25% (10)	February 2024
3.700%, $300,000 aggregate principal	298,567		298,322		3.70% (11)	June 2021
5.000%, $300,000 aggregate principal	296,918		296,731		5.00% (12)	July 2025
Unsecured note payable	1,228		1,287		0% (13)	May 2026
Total debt, net	$	1,871,445	$	1,828,333

(1) The carrying values of our debt other than the Revolving Credit Facility reflect net deferred financing costs of $4.5 million as of June 30, 2018 and $5.0 million as of December 31, 2017.

(2)   Certain of the fixed rate mortgages carry interest rates that, upon assumption, were above or below market rates 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 $315,000 as of June 30, 2018 and $349,000 as of December 31, 2017.

(3) The weighted average interest rate on our fixed rate mortgage debt was 4.18% as of June 30, 2018.

(4)  The interest rate on our variable rate secured debt was 3.83% as of June 30, 2018.

(5) The weighted average interest rate on the Revolving Credit Facility was 3.19% as of June 30, 2018.

(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 June 30, 2018, 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.

(8)  The weighted average interest rate on these loans was 3.35% as of June 30, 2018.

(9) The carrying value of these notes reflects an unamortized discount totaling $1.5 millionas of June 30, 2018 and $1.7 million as of December 31, 2017.  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 $2.8 millionas of June 30, 2018 and $3.0 million as of December 31, 2017.  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 $1.1 millionas of June 30, 2018 and $1.3 million as of December 31, 2017.  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 $2.6 millionas of June 30, 2018 and $2.7 million as of December 31, 2017.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

(13)  This note carries an interest rate that, upon assumption, was below market rates and it therefore was recorded at its fair value based on applicable effective interest rates.  The carrying value of this note reflects an unamortized discount totaling $333,000 as of June 30, 2018 and $373,000 as of December 31, 2017.

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 June 30, 2018, we were within the compliance requirements of these financial covenants.

We capitalized interest costs of $1.4 million in the three months ended June 30, 2018, $1.6 million in the three months ended June 30, 2017, $2.8 million in the six months endedJune 30, 2018 and $3.1 million in the six months endedJune 30, 2017.

26

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

	June 30, 2018				December 31, 2017
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Fixed-rate debt
Unsecured Senior Notes	$	1,190,139	$	1,220,040	$	1,189,249	$	1,229,398
Other fixed-rate debt	150,178		148,257		152,010		152,485
Variable-rate debt	531,128		530,968		487,074		485,694
	$	1,871,445	$	1,899,265	$	1,828,333	$	1,867,577

10.    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	June 30, 2018		December 31, 2017
$	100,000		1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	$	745	$	252
13,026		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	343		213
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	3,481		1,046
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	3,494		1,051
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	1,729		511
							$	9,792	$	3,073

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

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	June 30, 2018		December 31, 2017
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets, net	$	9,792	$	3,073

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

	Amount of Gain (Loss) Recognized in AOCI on Derivatives										Amount of Gain (Loss) Reclassified from AOCI into Interest Expense on Statement of Operations
	For the Three Months Ended June 30,					For the Six Months Ended June 30,					For the Three Months Ended June 30,					For the Six Months Ended June 30,
Derivatives in Hedging Relationships	2018		2017			2018		2017			2018		2017			2018			2017
Interest rate derivatives	$	1,912	$	(1,800	)	$	6,588	$	(1,576	)	$	47	$	(941	)	$	(198	)	$	(2,125	)

Over the next 12 months, we estimate that approximately $1.9 million of gains will be reclassified from AOCI as a decrease 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. We are not in default with any of these provisions. As of June 30, 2018, we did not have any derivatives in liability positions. As of June 30, 2018, we had not posted any collateral related to these agreements.

27

11.    Redeemable Noncontrolling Interests

Our partners in two real estate joint ventures, LW Redstone Company, LLC and Stevens Investors, LLC (discussed further in Note 6), 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 sheets. 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, occupancy projections and estimated operating and development expenditures. The table below sets forth the activity for these redeemable noncontrolling interests (in thousands):

	For the Six Months Ended June 30,
	2018			2017
Beginning balance	$	23,125		$	22,979
Contributions from noncontrolling interests	143			—
Distributions to noncontrolling interests	(711		)	(789		)
Net income attributable to noncontrolling interests	1,229			1,140
Adjustment to arrive at fair value of interests	758			401
Ending balance	$	24,544		$	23,731

12.    Equity

During the six months endedJune 30, 2018, COPT issued 1.8 million common shares under its forward equity sale agreements for net proceeds of $52.3 million. COPT contributed the net proceeds from these issuances to COPLP in exchange for an equal number of units in COPLP. COPT’s remaining capacity under the forward equity sale agreements was 5.7 million common shares as of June 30, 2018.

During the six months endedJune 30, 2018, certain COPLP limited partners converted 53,817 common units in COPLP for an equal number of common shares in COPT.

As of June 30, 2018, COPT had remaining capacity under its at-the-market stock offering program equal to an aggregate gross sales price of $70.0 million in common share sales.

See Note 14 for disclosure of COPT common share and COPLP common unit activity pertaining to our share-based compensation plans.

28

13.    Information by Business Segment

We have the following reportable segments: Defense/IT Locations; Regional Office; 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). As of June 30, 2018 and December 31, 2017, our Regional Office segment included properties located in select urban/urban-like submarkets in the Greater Washington, DC/Baltimore region with durable Class-A office fundamentals and characteristics; during 2017, this segment also included suburban properties that did not meet these characteristics (that were since disposed).

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.

29

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

	Operating 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			Wholesale Data Center			Other			Total
Three Months Ended June 30, 2018
Revenues from real estate operations	$	61,993		$	13,118		$	12,382		$	8,127		$	3,652		$	5,955		$	105,227		$	15,296		$	8,105		$	534		$	129,162
Property operating expenses	(20,099		)	(4,909		)	(7,494		)	(3,431		)	(1,509		)	(799		)	(38,241		)	(7,169		)	(4,150		)	114			(49,446		)
UJV NOI allocable to COPT	—			—			—			—			—			1,202			1,202			—			—			—			1,202
NOI from real estate operations	$	41,894		$	8,209		$	4,888		$	4,696		$	2,143		$	6,358		$	68,188		$	8,127		$	3,955		$	648		$	80,918
Additions to long-lived assets	$	8,151		$	1,186		$	—		$	1,450		$	351		$	—		$	11,138		$	5,361		$	81		$	188		$	16,768
Transfers from non-operating properties	$	3,035		$	352		$	—		$	3		$	26		$	29,675		$	33,091		$	—		$	1,133		$	—		$	34,224
Three Months Ended June 30, 2017
Revenues from real estate operations	$	61,284		$	11,095		$	13,029		$	7,449		$	3,624		$	5,800		$	102,281		$	17,462		$	7,033		$	1,521		$	128,297
Property operating expenses	(20,129		)	(4,219		)	(8,130		)	(3,025		)	(1,491		)	(577		)	(37,571		)	(7,082		)	(3,501		)	(474		)	(48,628		)
UJV NOI allocable to COPT	—			—			—			—			—			1,198			1,198			—			—			—			1,198
NOI from real estate operations	$	41,155		$	6,876		$	4,899		$	4,424		$	2,133		$	6,421		$	65,908		$	10,380		$	3,532		$	1,047		$	80,867
Additions to long-lived assets	$	5,853		$	977		$	16		$	2,231		$	84		$	—		$	9,161		$	4,018		$	2,005		$	(29	)	$	15,155
Transfers from non-operating properties	$	18,159		$	218		$	—		$	466		$	1,709		$	26,215		$	46,767		$	(25	)	$	—		$	—		$	46,742
Six Months Ended June 30, 2018
Revenues from real estate operations	$	124,775		$	25,679		$	23,825		$	15,997		$	7,285		$	11,786		$	209,347		$	30,580		$	16,182		$	1,331		$	257,440
Property operating expenses	(41,703		)	(9,632		)	(14,092		)	(6,735		)	(2,949		)	(1,593		)	(76,704		)	(15,047		)	(8,408		)	(238		)	(100,397		)
UJV NOI allocable to COPT	—			—			—			—			—			2,401			2,401			—			—			—			2,401
NOI from real estate operations	$	83,072		$	16,047		$	9,733		$	9,262		$	4,336		$	12,594		$	135,044		$	15,533		$	7,774		$	1,093		$	159,444
Additions to long-lived assets	$	15,272		$	3,126		$	—		$	2,558		$	430		$	—		$	21,386		$	9,245		$	117		$	315		$	31,063
Transfers from non-operating properties	$	20,221		$	693		$	—		$	—		$	470		$	30,789		$	52,173		$	—		$	2,145		$	—		$	54,318
Segment assets at June 30, 2018	$	1,269,525		$	396,139		$	126,956		$	190,537		$	106,374		$	330,622		$	2,420,153		$	396,847		$	221,239		$	4,213		$	3,042,452
Six Months Ended June 30, 2017
Revenues from real estate operations	$	122,139		$	22,802		$	24,663		$	14,459		$	7,084		$	11,322		$	202,469		$	35,738		$	13,803		$	3,054		$	255,064
Property operating expenses	(40,649		)	(8,671		)	(14,932		)	(6,234		)	(2,862		)	(1,236		)	(74,584		)	(14,568		)	(6,866		)	(1,129		)	(97,147		)
UJV NOI allocable to COPT	—			—			—			—			—			2,400			2,400			—			—			—			2,400
NOI from real estate operations	$	81,490		$	14,131		$	9,731		$	8,225		$	4,222		$	12,486		$	130,285		$	21,170		$	6,937		$	1,925		$	160,317
Additions to long-lived assets	$	9,275		$	3,445		$	16		$	4,399		$	216		$	—		$	17,351		$	11,138		$	3,579		$	127		$	32,195
Transfers from non-operating properties	$	31,575		$	440		$	—		$	466		$	1,705		$	25,200		$	59,386		$	(25	)	$	8		$	18		$	59,387
Segment assets at June 30, 2017	$	1,267,635		$	357,747		$	130,431		$	195,732		$	109,586		$	247,974		$	2,309,105		$	435,399		$	229,224		$	19,350		$	2,993,078

30

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 June 30,				For the Six Months Ended June 30,
	2018		2017		2018		2017
Segment revenues from real estate operations	$	129,162	$	128,297	$	257,440	$	255,064
Construction contract and other service revenues	17,581		23,138		44,779		36,172
Total revenues	$	146,743	$	151,435	$	302,219	$	291,236

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
UJV NOI allocable to COPT	$	1,202		$	1,198		$	2,401		$	2,400
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(828		)	(827		)	(1,652		)	(1,651		)
Add: Equity in loss of unconsolidated non-real estate entities	(1		)	(1		)	(3		)	(2		)
Equity in income of unconsolidated entities	$	373		$	370		$	746		$	747

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Construction contract and other service revenues	$	17,581		$	23,138		$	44,779		$	36,172
Construction contract and other service expenses	(16,941		)	(22,315		)	(43,157		)	(34,801		)
NOI from service operations	$	640		$	823		$	1,622		$	1,371

31

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

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
NOI from real estate operations	$	80,918		$	80,867		$	159,444		$	160,317
NOI from service operations	640			823			1,622			1,371
Interest and other income	1,439			1,583			2,798			3,309
Equity in income of unconsolidated entities	373			370			746			747
Income tax expense	(63		)	(48		)	(118		)	(88		)
Depreciation and other amortization associated with real estate operations	(33,190		)	(32,793		)	(66,702		)	(65,852		)
Impairment losses	—			(1,625		)	—			(1,625		)
General, administrative and leasing expenses	(7,628		)	(7,859		)	(14,920		)	(16,470		)
Business development expenses and land carry costs	(1,234		)	(1,597		)	(2,848		)	(3,290		)
Interest expense	(18,945		)	(19,163		)	(37,729		)	(38,157		)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,202		)	(1,198		)	(2,401		)	(2,400		)
Loss on early extinguishment of debt	—			(513		)	—			(513		)
Income before gain on sales of real estate	$	21,108		$	18,847		$	39,892		$	37,349

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

	June 30, 2018		June 30, 2017
Segment assets	$	3,042,452	$	2,993,078
Non-operating property assets	431,661		452,824
Other assets	138,249		146,402
Total COPT consolidated assets	$	3,612,362	$	3,592,304

The accounting policies of the segments are the same as those used to prepare our consolidated financial statements, except that 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 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.

14.    Share-Based Compensation

Performance Share Awards (“PSUs”)

On January 1, 2018, our Board of Trustees granted 59,110 PSUs with an aggregate grant date fair value of $1.9 million to our three executives.  The PSUs have a performance period beginning on January 1, 2018 and concluding on the earlier of December 31, 2020 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	100% of PSUs granted
25th	50% of PSUs granted
Below 25th	0% of PSUs granted

32

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 number of earned PSUs in settlement of the award plan; and

• pay cash equal to 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.

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

We computed a grant date fair value of $31.97 per PSU using a Monte Carlo model. Significant assumptions for that model included the following: baseline common share value of $29.20; expected volatility for COPT common shares of 17.0%; and a risk-free interest rate of 2.04%.  

We issued 13,328 common shares on February 22, 2018 to executives in settlement of PSUs issued in 2015, representing 75% of the target award for those PSUs.

Restricted Shares

During the six months endedJune 30, 2018, certain employees and non-employee members of our Board of Trustees were granted a total of 196,366 restricted common shares with an aggregate grant date fair value of $5.0 million (weighted average of $25.38 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 employee remains 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 six months endedJune 30, 2018, forfeiture restrictions lapsed on 161,322 previously issued common shares; these shares had a weighted average grant date fair value of $29.72 per share, and the aggregate intrinsic value of the shares on the vesting dates was $4.1 million.

Deferred Share Awards

During the six months endedJune 30, 2018, non-employee members of our Board of Trustees were granted a total of 13,832 deferred share awards with an aggregate grant date fair value of $388,000 ($28.08 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 six months endedJune 30, 2018, we issued 5,515 common shares in settlement of deferred share awards; these shares had a grant date fair value of $29.32 per share, and the aggregate intrinsic value of the shares on the settlement date was $154,000.

15.    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 COPT’s forward equity sale agreements and our 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.

33

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Numerator:
Net income attributable to COPT	$	19,434		$	17,526		$	36,584		$	38,545
Preferred share dividends	—			(3,039		)	—			(6,219		)
Issuance costs associated with redeemed preferred shares	—			(6,847		)	—			(6,847		)
Income attributable to share-based compensation awards	(117		)	(117		)	(234		)	(242		)
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders	$	19,317		$	7,523		$	36,350		$	25,237
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	101,789			99,036			101,397			98,725
Dilutive effect of share-based compensation awards	119			160			131			158
Denominator for diluted EPS (common shares)	101,908			99,196			101,528			98,883
Basic EPS	$	0.19		$	0.08		$	0.36		$	0.26
Diluted EPS	$	0.19		$	0.08		$	0.36		$	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 June 30,		For the Six Months Ended June 30,
	2018	2017	2018	2017
Conversion of common units	3,197	3,405	3,208	3,425
Conversion of Series I preferred units	176	176	176	176

The following securities were also excluded from the computation of diluted EPS because their effects were not dilutive:

• weighted average shares related to COPT’s forward equity sale agreements for the three and six months ended June 30, 2018 of 6.8 million and 7.1 million, respectively;

• weighted average restricted shares and deferred share awards for the three months ended June 30, 2018 and 2017 of 458,000 and 455,000, respectively, and for the six months endedJune 30, 2018 and 2017 of 451,000 and 424,000, respectively; and

• weighted average options for the three months ended June 30, 2018 and 2017 of 47,000 and 61,000, respectively, and for the six months endedJune 30, 2018 and 2017 of 53,000 and 100,000, 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 COPT’s forward equity sale agreements and our 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.

34

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Numerator:
Net income attributable to COPLP	$	20,207		$	17,952		$	38,066		$	39,758
Preferred unit distributions	(165		)	(3,204		)	(330		)	(6,549		)
Issuance costs associated with redeemed preferred units	—			(6,847		)	—			(6,847		)
Income attributable to share-based compensation awards	(117		)	(117		)	(234		)	(242		)
Numerator for basic and diluted EPU on net income attributable to COPLP common unitholders	$	19,925		$	7,784		$	37,502		$	26,120
Denominator (all weighted averages):
Denominator for basic EPU (common units)	104,986			102,441			104,605			102,150
Dilutive effect of share-based compensation awards	119			160			131			158
Denominator for diluted EPU (common units)	105,105			102,601			104,736			102,308
Basic EPU	$	0.19		$	0.08		$	0.36		$	0.26
Diluted EPU	$	0.19		$	0.08		$	0.36		$	0.26

Our diluted EPU computations do not include the effect of 176,000 common units resulting from an assumed conversion of the Series I preferred units since such a conversion would increase diluted EPU for the three and six months ended June 30, 2018 and 2017. The following securities were also excluded from the computation of diluted EPU because their effects were not dilutive:

• weighted average units related to COPT’s forward equity sale agreements for the three and six months ended June 30, 2018 of 6.8 million and 7.1 million, respectively;

• weighted average restricted units and deferred share awards for the three months ended June 30, 2018 and 2017 of 458,000 and 455,000, respectively, and for the six months endedJune 30, 2018 and 2017 of 451,000 and 424,000, respectively; and

• weighted average options for the three months ended June 30, 2018 and 2017 of 47,000 and 61,000, respectively, and for the six months endedJune 30, 2018 and 2017 of 53,000 and 100,000, respectively.

16.    Commitments and Contingencies

Litigation and Claims

In the normal course of business, we are subject to legal actions and other claims.  We record losses for specific legal proceedings and claims when we determine that a loss is probable and the amount of loss can be reasonably estimated.  Management believes that it is reasonably possible that we could incur losses pursuant to such claims but do not believe such losses would materially affect our financial position, liquidity or results of operations. 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.

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.

35

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. While we are obligated to fund, through a special tax, any future shortfalls between debt service of the bonds and real estate taxes available to repay the bonds, as of June 30, 2018, we do not expect any such future fundings will be required.

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 June 30, 2018 follow (in thousands):

Year Ending December 31,
2018 (1)	$	644
2019	1,277
2020	1,270
2021	1,274
2022	1,158
Thereafter	84,611
	$	90,234

(1) Represents the six months ending December 31, 2018.

Capital Lease

On May 25, 2017, we entered into a ground lease on land under development in Washington, DC through 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 in 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 and have since paid down most of this liability. The remaining capital lease obligation as of June 30, 2018 was comprised of the following (in thousands):

Minimum rental payments due in 2020	$	660
Less: Amount representing interest	(20		)
Capital lease obligation	$	640

Contractual Obligations

We had amounts remaining to be incurred under various contractual obligations as of June 30, 2018 that included the following (excluding amounts incurred and therefore reflected as liabilities reported on our consolidated balance sheets):

• new development and redevelopment obligations of $89.4 million;

• capital expenditures for operating properties of $41.5 million;

• third party construction of $4.5 million; and

• other obligations of $2.4 million.

36

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

Overview

During the six months endedJune 30, 2018: 

• we finished the period with our office and data center shell portfolio 91.4% occupied;

• we placed into service an aggregate of 236,000 square feet in three newly-constructed or redeveloped properties that were 75.9% leased as of June 30, 2018; and

• COPT issued 1.8 million common shares under its forward equity sale agreements for net proceeds of $52.3 million, which it contributed to COPLP in exchange for an equal number of units in COPLP. COPLP used the proceeds primarily to repay borrowings under our Revolving Credit Facility that funded development costs.

With regard to our operating portfolio square footage, occupancy and leasing statistics included below and elsewhere in this Quarterly Report on Form 10-Q, amounts disclosed:

• include information pertaining to six properties owned through an unconsolidated real estate joint venture except for amounts reported for Annualized Rental Revenue, which represent the portion attributable to our ownership interest; and

• exclude, for purposes of amounts reported as of June 30, 2018 and December 31, 2017, a property reported as held for sale that we sold in 2017 subject to our providing a financial guaranty to the buyer under which we 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 did not recognize the sale of this property for accounting purposes, and we reported the sales proceeds as a liability on our consolidated balance sheets.

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

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

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

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

• our ability to borrow on favorable terms;

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

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

37

• 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;

• possible adverse changes in tax laws;

• 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 and Data Center Shell Portfolio

The tables below set forth occupancy information pertaining to our portfolio of office and data center shell properties:

	June 30, 2018			December 31, 2017
Occupancy rates at period end
Total	91.4		%	93.6		%
Defense/IT Locations:
Fort Meade/BW Corridor	90.9		%	95.6		%
Northern Virginia Defense/IT	82.9		%	89.1		%
Lackland Air Force Base	100.0		%	100.0		%
Navy Support Locations	88.2		%	87.7		%
Redstone Arsenal	98.2		%	98.2		%
Data Center Shells	100.0		%	100.0		%
Total Defense/IT Locations	92.0		%	95.2		%
Regional Office	87.2		%	89.5		%
Other	82.2		%	34.4		%
Average contractual annual rental rate per square foot at period end (1)	$	30.09		$	29.84

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

	Rentable Square Feet		Occupied Square Feet
	(in thousands)
December 31, 2017	17,345		16,227
Vacated upon lease expiration (1)	—		(497	)
Occupancy for new leases (2)	—		205
Constructed or redeveloped (3)	566		200
Removed from operations (4)	(241	)	—
Other changes	(15	)	—
June 30, 2018	17,655		16,135

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

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

(3) Includes 330,000 unoccupied square feet that were completed in 2016 but reported as construction projects through December 31, 2017 since they were held for future lease to the United States Government.

(4) Includes the removal of one property for which we have no leasing plan or intention to allocate future capital and one property reclassified as redevelopment.

Total occupancy decreased from December 31, 2017 to June 30, 2018 due primarily to the addition of 404,000 unoccupied, newly-constructed square feet during the period, including: 243,000 in the Fort Meade/BW Corridor sub-segment; and 161,000 in the Northern Virginia Defense/IT sub-segment leased in June 2018 that we expect to be occupied by the end of the year.

38

During the six months endedJune 30, 2018, we completed 2.1 million square feet of leasing, including: renewed leases on 1.2 million square feet, representing 77.0% of the square footage of our lease expirations (including the effect of early renewals and excluding the effect of 108,000 square feet vacated in a property in the Fort Meade/BW Corridor sub-segment that was removed from service for redevelopment); 675,000 of construction and redevelopment space; and 187,000 in other leasing.

Wholesale Data Center

Our 19.25 megawatt wholesale data center had 16.86 megawatts leased as of June 30, 2018 and December 31, 2017.

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:

• office and data center shell 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 Properties”;

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

• disposed (including a property reported as held for sale as of December 31, 2017, the sale of which in 2017 was not recognized for accounting purposes); and

• our wholesale data center.

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 operating income, reliance on these measures has limitations; management compensates for these limitations by using the measures simply as supplemental measures that are considered alongside other GAAP and non-GAAP measures. 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 13 to our consolidated financial statements.

39

Comparison of Statements of Operations for the Three Months EndedJune 30, 2018 and 2017

	For the Three Months Ended June 30,
	2018			2017			Variance
	(in thousands)
Revenues
Revenues from real estate operations	$	129,162		$	128,297		$	865
Construction contract and other service revenues	17,581			23,138			(5,557		)
Total revenues	146,743			151,435			(4,692		)
Expenses
Property operating expenses	49,446			48,628			818
Depreciation and amortization associated with real estate operations	33,190			32,793			397
Construction contract and other service expenses	16,941			22,315			(5,374		)
Impairment losses	—			1,625			(1,625		)
General, administrative and leasing expenses	7,628			7,859			(231		)
Business development expenses and land carry costs	1,234			1,597			(363		)
Total operating expenses	108,439			114,817			(6,378		)
Operating income	38,304			36,618			1,686
Interest expense	(18,945		)	(19,163		)	218
Interest and other income	1,439			1,583			(144		)
Loss on early extinguishment of debt	—			(513		)	513
Equity in income of unconsolidated entities	373			370			3
Income tax expense	(63		)	(48		)	(15		)
Income before gain on sales of real estate	21,108			18,847			2,261
Gain on sales of real estate	(23		)	12			(35		)
Net income	$	21,085		$	18,859		$	2,226

40

NOI from Real Estate Operations

	For the Three Months Ended June 30,
	2018			2017			Variance
	(Dollars in thousands, except per square foot data)
Revenues
Same Properties revenues
Rental revenue, excluding lease termination revenue	$	89,071		$	88,860		$	211
Lease termination revenue	558			517			41
Tenant recoveries and other real estate operations revenue	24,567			24,468			99
Same Properties total revenues	114,196			113,845			351
Constructed and redeveloped properties placed in service	6,476			1,879			4,597
Wholesale data center	8,105			7,033			1,072
Dispositions	5			4,899			(4,894		)
Other	380			641			(261		)
	129,162			128,297			865
Property operating expenses
Same Properties	(43,461		)	(42,944		)	(517		)
Constructed and redeveloped properties placed in service	(1,666		)	(867		)	(799		)
Wholesale data center	(4,150		)	(3,501		)	(649		)
Dispositions	(8		)	(941		)	933
Other	(161		)	(375		)	214
	(49,446		)	(48,628		)	(818		)
Same Properties UJV NOI allocable to COPT	1,202			1,198			4
NOI from real estate operations
Same Properties	71,937			72,099			(162		)
Constructed and redeveloped properties placed in service	4,810			1,012			3,798
Wholesale data center	3,955			3,532			423
Dispositions	(3		)	3,958			(3,961		)
Other	219			266			(47		)
	$	80,918		$	80,867		$	51
Same Properties rent statistics
Average occupancy rate	91.0		%	91.5		%	(0.5		)%
Average straight-line rent per occupied square foot (1)	$	6.45		$	6.39		$	0.06

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

Our Same Properties pool consisted of 147 properties, comprising 91.9% of our office and data center shell portfolio’s square footage as of June 30, 2018. This pool of properties included the following changes from the pool used for purposes of comparing 2017 and 2016 in our 2017 Annual Report on Form 10-K: the addition of 14 properties placed in service and 100% operational on or before January 1, 2017 (including six unconsolidated real estate joint venture properties and two properties added to our rentable square feet in 2018 that were previously reported as construction projects since they were held for future lease to the United States Government); and the removal of one property in 2018 for which we have no leasing plan or intention to allocate future capital and one property reclassified as redevelopment.

41

Our NOI from constructed and redeveloped properties placed in service included 12 properties placed in service in 2017 and 2018.

NOI from Service Operations

	For the Three Months Ended June 30,
	2018		2017		Variance
	(in thousands)
Construction contract and other service revenues	$	17,581	$	23,138	$	(5,557	)
Construction contract and other service expenses	16,941		22,315		(5,374		)
NOI from service operations	$	640	$	823	$	(183	)

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

Comparison of Statements of Operations for the Six Months EndedJune 30, 2018 and 2017

	For the Six Months Ended June 30,
	2018			2017			Variance
	(in thousands)
Revenues
Revenues from real estate operations	$	257,440		$	255,064		$	2,376
Construction contract and other service revenues	44,779			36,172			8,607
Total revenues	302,219			291,236			10,983
Expenses
Property operating expenses	100,397			97,147			3,250
Depreciation and amortization associated with real estate operations	66,702			65,852			850
Construction contract and other service expenses	43,157			34,801			8,356
Impairment losses	—			1,625			(1,625		)
General, administrative and leasing expenses	14,920			16,470			(1,550		)
Business development expenses and land carry costs	2,848			3,290			(442		)
Total operating expenses	228,024			219,185			8,839
Operating income	74,195			72,051			2,144
Interest expense	(37,729		)	(38,157		)	428
Interest and other income	2,798			3,309			(511		)
Loss on early extinguishment of debt	—			(513		)	513
Equity in income of unconsolidated entities	746			747			(1		)
Income tax expense	(118		)	(88		)	(30		)
Income before gain on sales of real estate	39,892			37,349			2,543
Gain on sales of real estate	(27		)	4,250			(4,277		)
Net income	$	39,865		$	41,599		$	(1,734	)

42

NOI from Real Estate Operations

	For the Six Months Ended June 30,
	2018			2017			Variance
	(Dollars in thousands, except per square foot data)
Revenues
Same Properties revenues
Rental revenue, excluding lease termination revenue	$	177,410		$	177,472		$	(62	)
Lease termination revenue	1,566			1,223			343
Tenant recoveries and other real estate operations revenue	48,678			48,389			289
Same Properties total revenues	227,654			227,084			570
Constructed and redeveloped properties placed in service	12,370			2,373			9,997
Wholesale data center	16,182			13,803			2,379
Dispositions	140			10,443			(10,303		)
Other	1,094			1,361			(267		)
	257,440			255,064			2,376
Property operating expenses
Same Properties	(88,278		)	(85,686		)	(2,592		)
Constructed and redeveloped properties placed in service	(3,277		)	(1,520		)	(1,757		)
Wholesale data center	(8,408		)	(6,866		)	(1,542		)
Dispositions	(30		)	(2,191		)	2,161
Other	(404		)	(884		)	480
	(100,397		)	(97,147		)	(3,250		)
Same Properties UJV NOI allocable to COPT	2,401			2,400			1
NOI from real estate operations
Same Properties	141,777			143,798			(2,021		)
Constructed and redeveloped properties placed in service	9,093			853			8,240
Wholesale data center	7,774			6,937			837
Dispositions	110			8,252			(8,142		)
Other	690			477			213
	$	159,444		$	160,317		$	(873	)
Same Properties rent statistics
Average occupancy rate	91.0		%	91.4		%	(0.4		)%
Average straight-line rent per occupied square foot (1)	$	12.85		$	12.79		$	0.06

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

The decrease in our Same Properties NOI from real estate operations reflected above was due primarily to higher snow and utilities expenses in the current period, as well as higher real estate taxes at certain properties resulting from increased property assessments.

Our NOI from constructed and redeveloped properties placed in service included 12 properties placed in service in 2017 and 2018.

NOI from Service Operations

	For the Six Months Ended June 30,
	2018		2017		Variance
	(in thousands)
Construction contract and other service revenues	$	44,779	$	36,172	$	8,607
Construction contract and other service expenses	43,157		34,801		8,356
NOI from service operations	$	1,622	$	1,371	$	251

43

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.

Gain on Sales of Real Estate

We recognized a gain on sales of real estate of $4.3 million in the prior period in connection with a land sale.

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 balance with other GAAP and non-GAAP measures. FFO is not necessarily an indication of our cash flow available to fund cash needs.  Additionally, it should not be used as an alternative to net income when evaluating our financial performance or to cash flow from operating, investing and financing activities when evaluating our liquidity or ability to make cash distributions or pay debt service.

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

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

Diluted FFO available to common share and common unit holders, as adjusted for comparability is defined as Diluted FFO adjusted to exclude operating property acquisition costs; gains on sales of, and impairment losses on, properties other than previously depreciated operating properties, net of associated income tax; gain or loss on early extinguishment of debt; FFO associated with properties securing non-recourse debt on which we have defaulted and which we have extinguished, or expect to extinguish, via conveyance of such properties, including property NOI, interest expense and gains on debt extinguishment; loss on interest rate derivatives; demolition costs on redevelopment and nonrecurring improvements; executive transition costs;

44

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.

45

The table below sets forth the computation of the above stated measures for the three and six months endedJune 30, 2018 and 2017, and provides reconciliations to the GAAP measures of COPT and subsidiaries associated with such measures:

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
	(Dollars and shares in thousands,  except per share data)
Net income	$	21,085		$	18,859		$	39,865		$	41,599
Add: Real estate-related depreciation and amortization	33,190			32,793			66,702			65,852
Add: Depreciation and amortization on UJV allocable to COPT	564			563			1,127			1,126
Add: Impairment losses on previously depreciated operating properties	—			1,610			—			1,610
Less: Gain on sales of previously depreciated operating properties	23			(12		)	27			(31		)
FFO	54,862			53,813			107,721			110,156
Less: Noncontrolling interests-preferred units in the Operating Partnership	(165		)	(165		)	(330		)	(330		)
Less: FFO allocable to other noncontrolling interests	(753		)	(906		)	(1,697		)	(1,884		)
Less: Preferred share dividends	—			(3,039		)	—			(6,219		)
Less: Issuance costs associated with redeemed preferred shares	—			(6,847		)	—			(6,847		)
Basic and diluted FFO allocable to share-based compensation awards	(224		)	(185		)	(437		)	(401		)
Basic and diluted FFO available to common share and common unit holders	53,720			42,671			105,257			94,475
Gain on sales of non-operating properties	—			—			—			(4,219		)
Impairment losses on non-operating properties	—			15			—			15
Loss (gain) on interest rate derivatives	—			444			—			(9		)
Loss on early extinguishment of debt	—			513			—			513
Issuance costs associated with redeemed preferred shares	—			6,847			—			6,847
Executive transition costs	213			31			376			730
Demolition costs on redevelopment and nonrecurring improvements	9			72			48			294
Diluted FFO comparability adjustments allocable to share-based compensation awards	(1		)	(31		)	(2		)	(17		)
Diluted FFO available to common share and common unit holders, as adjusted for comparability	$	53,941		$	50,562		$	105,679		$	98,629
Weighted average common shares	101,789			99,036			101,397			98,725
Conversion of weighted average common units	3,197			3,405			3,208			3,425
Weighted average common shares/units - Basic FFO	104,986			102,441			104,605			102,150
Dilutive effect of share-based compensation awards	119			160			131			158
Weighted average common shares/units - Diluted FFO	105,105			102,601			104,736			102,308
Diluted FFO per share	$	0.51		$	0.42		$	1.00		$	0.92
Diluted FFO per share, as adjusted for comparability	$	0.51		$	0.49		$	1.01		$	0.96
Denominator for diluted EPS	101,908			99,196			101,528			98,883
Weighted average common units	3,197			3,405			3,208			3,425
Denominator for diluted FFO per share measures	105,105			102,601			104,736			102,308

46

Property Additions

The table below sets forth the major components of our additions to properties for the six months endedJune 30, 2018 (in thousands):

Construction, development and redevelopment	$	73,323
Tenant improvements on operating properties (1)	15,624
Capital improvements on operating properties	7,697
	$	96,644

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

Cash Flows

Net cash flow from operating activities decreased $36.8 million when comparing the six months endedJune 30, 2018 and 2017 due primarily to our payment in 2018 of construction costs on a contract that the customer pre-funded to us in prior years.

Net cash flow from investing activities decreased $38.0 million when comparing the six months endedJune 30, 2018 and 2017 due primarily to a decrease in property sales in 2018 relative to 2017, which was offset in part by lower expenditures for development in 2018 relative to 2017.

Net cash flow provided by financing activities in the six months endedJune 30, 2018 was $13.8 million, and included the following:

• net debt borrowings of $41.9 million; and

• net proceeds from the issuance of common shares (or units) of $52.3 million; offset in part by

• dividends and/or distributions to equity holders of $58.1 million; and

• payments on a capital lease obligation of $15.4 million.

Net cash flow used in financing activities in the six months endedJune 30, 2017 was $258.0 million, and included the following:

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

• dividends and/or distributions to equity holders of $66.0 million; offset in part by

• net proceeds from the issuance of common shares (or units) of $19.8 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 occasionally issues public equity 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 June 30, 2018, COPT owned 97.0% of the outstanding common units in COPLP; the remaining common units and all of the outstanding preferred units 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 9 of the notes to consolidated financial statements included elsewhere herein. If the Operating Partnership fails to fulfill certain of its debt requirements, which trigger COPT’s guarantee obligations, then COPT will be required to fulfill its cash payment commitments under such guarantees. However, COPT’s only significant asset is its investment in COPLP.

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

47

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

COPLP’s 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 COPLP to continue to use cash flow provided by operations as the primary source to meet its short-term capital needs, including property operating expenses, general and administrative expenses, interest expense, scheduled principal amortization of debt, distributions to its security holders and improvements to existing properties.  As of June 30, 2018, COPLP had $8.5 million in cash and cash equivalents.

COPLP’s senior unsecured debt is currently rated investment grade by the three major rating agencies. We aim to maintain an investment grade rating to enable COPLP to use debt comprised of unsecured, primarily fixed-rate debt (including the effect of interest rate swaps) from public markets and banks. COPLP also uses secured nonrecourse debt from institutional lenders and banks for joint venture financing. In addition, COPLP periodically raises equity from COPT when COPT accesses the public equity markets by issuing common and/or preferred shares.

COPLP uses its Revolving Credit Facility to initially finance much of its investing activities.  COPLP subsequently pays 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 COPLP 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. The Revolving Credit Facility matures in May 2019, and may be extended by two six-month periods at COPLP’s option, provided that there is no default under the facility and it pays an extension fee of 0.075% of the total availability of the facility. As of June 30, 2018, the maximum borrowing capacity under this facility totaled $800.0 million, of which $630.0 million was available.

As of June 30, 2018, COPT had forward equity sale agreements in place with 5.7 million shares available for future issuance with a settlement value of $167.0 million that we expect to use to fund development costs.

We believe that COPLP’s liquidity and capital resources are adequate for its near-term and longer-term requirements without necessitating property sales. However, we may dispose of interests in properties opportunistically or when capital markets otherwise warrant.

48

The following table summarizes our contractual obligations as of June 30, 2018 (in thousands):

	For the Periods Ending December 31,
	2018		2019		2020		2021		2022		Thereafter		Total
Contractual obligations (1)
Debt (2)
Balloon payments due upon maturity	$	—	$	170,000	$	112,132	$	300,000	$	250,000	$	1,026,830	$	1,858,962
Scheduled principal payments (3)	2,138		4,387		4,024		3,875		4,033		6,647		25,104
Interest on debt (3)(4)	38,058		72,195		67,801		59,606		54,475		63,592		355,727
New construction and redevelopment obligations (5)(6)	88,630		797		—		—		—		—		89,427
Third-party construction obligations (6)(7)	3,076		1,378		—		—		—		—		4,454
Capital expenditures for operating properties (3)(6)(8)	13,360		18,990		9,158		—		—		—		41,508
Capital lease obligation (principal and interest)	—		—		660		—		—		—		660
Operating leases (3)	644		1,277		1,270		1,274		1,158		84,611		90,234
Other obligations (3)	379		434		254		182		178		977		2,404
Total contractual cash obligations	$	146,285	$	269,458	$	195,299	$	364,937	$	309,844	$	1,182,657	$	2,468,480

(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 $12.6 million. As of June 30, 2018, maturities included $170.0 million in 2019 that may be extended to 2020, subject to certain conditions.

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

(4) Represents interest costs for our outstanding debt as of June 30, 2018 for the terms of such debt.  For variable rate debt, the amounts reflected above used June 30, 2018 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.

(5) Represents contractual obligations pertaining to new development and redevelopment activities.

(6) 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.

(7)   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.

(8) Represents contractual obligations pertaining to capital expenditures for our operating properties.  We expect to pay these costs primarily using cash flow from operating activities.

We expect to spend approximately $200 million on construction and development costs and approximately $35 million on improvements to operating properties (including the commitments set forth in the table above) during the remainder of 2018.  We expect to fund the construction and development costs initially using primarily borrowings under our Revolving Credit Facility and proceeds from common shares issued under COPT’s forward equity sale agreements.  We expect to fund improvements to existing operating properties using cash flow from operating activities.

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 June 30, 2018, we were compliant with these covenants.

Off-Balance Sheet Arrangements

 We had no material off-balance sheet arrangements during the six months endedJune 30, 2018.

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.

49

Recent Accounting Pronouncements

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

Item 3.Quantitative and Qualitative Disclosures about Market Risk

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

The following table sets forth as of June 30, 2018 our debt obligations and weighted average interest rates on debt maturing each year (dollars in thousands):

	For the Periods Ending December 31,
	2018			2019			2020			2021			2022			Thereafter			Total
Debt:
Fixed rate debt (1)	$	1,946		$	3,991		$	3,718		$	303,875		$	4,033		$	1,033,477		$	1,351,040
Weighted average interest rate	4.37		%	4.36		%	3.96		%	3.70		%	3.98		%	4.48		%	4.30		%
Variable rate debt (2)	$	192		$	170,396		$	112,438		$	—		$	250,000		$	—		$	533,026
Weighted average interest rate (3)	3.83		%	3.19		%	3.44		%	—		%	3.34		%	—		%	3.31		%

(1) Represents principal maturities only and therefore excludes net discounts and deferred financing costs of $12.6 million.

(2) As of June 30, 2018, 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 June 30, 2018 for variable rate debt.

The fair value of our debt was $1.9 billion as of June 30, 2018.  If interest rates had been 1% lower, the fair value of our fixed-rate debt would have increased by approximately $61 million as of June 30, 2018.

See Note 10 to our consolidated financial statements for information pertaining to interest rate swap contracts in place as of June 30, 2018 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 $902,000 in the six months endedJune 30, 2018 if the applicable LIBOR rate was 1% higher.

Item 4.Controls and Procedures

COPT

(a) Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of COPT’s disclosure controls and procedures (as defined in Rule 13a-15(e) under the Exchange Act) as of June 30, 2018.  Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that COPT’s disclosure controls and procedures as of June 30, 2018 were functioning effectively to provide reasonable assurance that the information required to be disclosed 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 its 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 COPT’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

50

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of COPLP’s disclosure controls and procedures (as defined in Rule 15d-15(e) under the Exchange Act) as of June 30, 2018.  Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that COPLP’s disclosure controls and procedures as of June 30, 2018 were functioning effectively to provide reasonable assurance that the information required to be disclosed 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 its 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 COPLP’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 2017 Annual Report on Form 10-K.

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

None.

Item 3.Defaults Upon Senior Securities

(a) Not applicable

(b) Not applicable

Item 4.Mine Safety Disclosures

Not applicable

Item 5.Other Information

None

51

Item 6.Exhibits

(a) Exhibits:

EXHIBIT NO.	DESCRIPTION
3.1	Amended and Restated Declaration of Trust of Corporate Office Properties Trust, as amended through May 15, 2018 (filed herewith).
12.1	COPT’s Statement regarding Computation of Consolidated Ratio 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 their 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:	July 31, 2018	Dated:	July 31, 2018

53

EX-3.1

Exhibit 3.1

CORPORATE OFFICE PROPERTIES TRUST

AMENDED AND RESTATED DECLARATION OF TRUST

(Reflecting amendments through May 15, 2018)

This DECLARATION OF TRUST is made as of the date set forth above by the undersigned Trustee (as defined herein):

ARTICLE I

FORMATION

The Trust is a real estate investment trust within the meaning of Title 8. The Trust shall not be deemed to be a general partnership, limited partnership, joint venture, joint stock company or a corporation (but nothing herein shall preclude the Trust from being treated for tax purposes as an association under the Code).

ARTICLE II

NAME

The name of the Trust is:

Corporate Office Properties Trust

Under circumstances in which the Board of Trustees of the Trust (the “Board of Trustees” or “Board”) determines that the use of the name of the Trust is not practicable, the Trust may use any other designation or name for the Trust.

ARTICLE III

PURPOSES AND POWERS

Section 3.1 Purposes. The purposes for which the Trust is formed are to invest in and to acquire, hold, manage, administer, control and dispose of property and interests (direct or indirect and of whatsoever nature) in and in respect of property, including, without limitation or obligation, engaging in business as a real estate investment trust under the Internal Revenue Code of 1986, as amended (the “Code”).

Section 3.2 Powers. The Trust shall have all of the powers granted to real estate investment trusts by Title 8 and all other powers set forth in the Declaration of Trust which are not inconsistent with law and are appropriate to promote and attain the purposes set forth in the Declaration of Trust.

ARTICLE IV

RESIDENT AGENT

The name of the resident agent of the Trust in the State of Maryland is James J. Hanks, Jr., whose post office address is c/o Ballard Spahr Andrews & Ingersoll, 300 East Lombard Street, Baltimore, Maryland 21202. The resident agent is a citizen of and resides in the State of Maryland. The Trust may have such offices or places of business within or outside the State of Maryland as the Board of Trustees may from time to time determine.

ARTICLE V

BOARD OF TRUSTEES

Section 5.1 Powers. Subject to any express limitations contained in the Declaration of Trust or in the Bylaws, (a) the business and affairs of the Trust shall be managed under the direction of the Board of Trustees and (b) the Board shall have full, exclusive and absolute power, control and authority over any and all property of the Trust. The Board may take any action as in its sole judgment and discretion is necessary or appropriate to conduct the business and affairs of the Trust. The Declaration of Trust shall be construed with the presumption in favor of the grant of power and authority to the Board. Any construction of the Declaration of Trust or determination made in good faith by the Board concerning its powers and authority hereunder shall be conclusive. The enumeration and definition of particular powers of the Trustees included in the Declaration of Trust or in the Bylaws shall in no way be limited or restricted by reference to or inference from the terms of this or any other provision of the Declaration of Trust or the Bylaws or construed or deemed by inference or otherwise in any manner to exclude or limit the powers conferred upon the Board or the Trustees under the general laws of the State of Maryland or any other applicable laws.

The Board, without any action by the shareholders of the Trust, shall have and may exercise, on behalf of the Trust, without limitation, the power to terminate the status of the Trust as a real estate investment trust under the Code; to determine that compliance with any restriction or limitations on ownership and transfers of shares of the Trust’s beneficial interest set forth in Article VII of the Declaration of Trust is no longer required in order for the Trust to qualify as a REIT; to adopt, amend and repeal Bylaws; to elect officers in the manner prescribed in the Bylaws; to solicit proxies from holders of shares of beneficial interest of the Trust; and to do any other acts and deliver any other documents necessary or appropriate to the foregoing powers.

Section 5.2 Number and Class. The number of Trustees (hereinafter the “Trustees”) is nine (9), which number may be increased or decreased pursuant to the Bylaws of the Trust. The Trustees shall be elected at each annual meeting of shareholders in the manner provided in the Bylaws or, in order to fill any vacancy on the Board of Trustees, in the manner provided in the Bylaws. It shall not be necessary to list in the Declaration of Trust the names and addresses of any Trustees.

Section 5.3 Resignation, Removal or Death. Any Trustee may resign by written notice to the Board, effective upon execution and delivery to the Trust of such written notice or upon any future date specified in the notice. Subject to the rights of holders of one or more classes or series of Preferred Shares to elect one or more Trustees, a Trustee may be removed at any time, only for cause and only at a meeting of the shareholders, by the affirmative vote of the holders of not less than two-thirds of the Shares then outstanding and entitled to vote generally in the election of Trustees.

ARTICLE VI

SHARES OF BENEFICIAL INTEREST

Section 6.1 Authorized Shares. The beneficial interest of the Trust shall be divided into shares of beneficial interest (the “Shares”). The Trust has authority to issue 175,000,000 shares of beneficial interest, consisting of 150,000,000 common shares of beneficial interest, $0.01 par value per share (“Common Shares”), and 25,000,000 preferred shares of beneficial interest, $0.01 par value per share (“Preferred Shares”). The Board of Trustees, without any action by the shareholders of the Trust, may amend the Declaration of Trust from time to time to increase or decrease the aggregate number of Shares or the number of Shares of any class that the Trust has authority to issue. If shares of one class of stock are classified or reclassified into shares of another class of stock pursuant to Sections 6.2, 6.3 or 6.4 of this Article VI, the number of authorized shares of the former class shall be automatically decreased and the number of shares of the latter class shall be automatically increased, in each case by the number of shares so classified or reclassified.

Section 6.2 Common Shares. Subject to the provisions of Article VII, each Common Share shall entitle the holder thereof to one vote on each matter upon which holders of Common Shares are entitled to vote. The Board of Trustees may reclassify any unissued Common Shares from time to time in one or more classes or series of Shares.

Section 6.3 Preferred Shares. The Board of Trustees may classify any unissued Preferred Shares and reclassify any previously classified but unissued Preferred Shares of any series from time to time, in one or more classes or series of Shares.

Section 6.4 Classified or Reclassified Shares. Prior to issuance of classified or reclassified Shares of any class or series, the Board of Trustees by resolution shall (a) designate that class or series to distinguish it from all other classes and series of Shares; (b) specify the number of Shares to be included in the class or series; (c) set, subject to the provisions of Article VII and subject to the express terms of any class or series of Shares outstanding at the time, the preferences, conversion or other rights, voting powers, restrictions, limitations as to dividends or other distributions, qualifications and terms and conditions of redemption for each class or series; and (d) cause the Trust to file articles supplementary with the State Department of Assessments and Taxation of Maryland (the “SDAT”). Any of the terms of any class or series of Shares set pursuant to clause (c) of this Section 6.4 may be made dependent upon facts ascertainable outside the Declaration of Trust (including the occurrence of any event, including a determination or action by the Trust or any other person or body) and may vary among holders

thereof, provided that the manner in which such facts or variations shall operate upon the terms of such class or series of Shares is clearly and expressly set forth in the articles supplementary filed with the SDAT.

Section 6.5 Authorization by Board of Share Issuance. The Board of Trustees may authorize the issuance from time to time of Shares of any class or series, whether now or hereafter authorized, or securities or rights convertible into Shares of any class or series, whether now or hereafter authorized, for such consideration (whether in cash, property, past or future services, obligation for future payment or otherwise) as the Board of Trustees may deem advisable (or without consideration in the case of a Share split or Share dividend), subject to such restrictions or limitations, if any, as may be set forth in the Declaration of Trust or the Bylaws of the Trust.

Section 6.6 Dividends and Distributions. The Board of Trustees may from time to time authorize and declare to shareholders such dividends or distributions, in cash or other assets of the Trust or in securities of the Trust or from any other source as the Board of Trustees in its discretion shall determine. The Board of Trustees shall endeavor to declare and pay such dividends and distributions as shall be necessary for the Trust to qualify as a real estate investment trust under the Code; however, shareholders shall have no right to any dividend or distribution unless and until authorized and declared by the Board. The exercise of the powers and rights of the Board of Trustees pursuant to this Section 6.6 shall be subject to the provisions of any class or series of Shares at the time outstanding. Notwithstanding any other provision in the Declaration of Trust, no determination shall be made by the Board of Trustees nor shall any transaction be entered into by the Trust which would cause any Shares or other beneficial interest in the Trust not to constitute “transferable shares” or “transferable certificates of beneficial interest” under Section 856(a)(2) of the Code or which would cause any distribution to constitute a preferential dividend as described in Section 562(c) of the Code.

Section 6.7 General Nature of Shares. All Shares shall be personal property entitling the shareholders only to those rights provided in the Declaration of Trust. The shareholders shall have no interest in the property of the Trust and shall have no right to compel any partition, division, dividend or distribution of the Trust or of the property of the Trust. The death of a shareholder shall not terminate the Trust. The Trust is entitled to treat as shareholders only those persons in whose names Shares are registered as holders of Shares on the beneficial interest ledger of the Trust.

Section 6.8 Fractional Shares. The Trust may, without the consent or approval of any shareholder, issue fractional Shares, eliminate a fraction of a Share by rounding up or down to a full Share, arrange for the disposition of a fraction of a Share by the person entitled to it, or pay cash for the fair value of a fraction of a Share.

Section 6.9 Declaration and Bylaws. All shareholders are subject to the provisions of the Declaration of Trust and the Bylaws of the Trust. Except as otherwise specifically required by law, the Trustees and the Shareholders shall each have the power to adopt, amend and modify the

Bylaws of the Trust in the manner set forth in the Bylaws as the same may be amended or modified from time to time.

Section 6.10 Divisions and Combinations of Shares. Subject to an express provision to the contrary in the terms of any class or series of beneficial interest hereafter authorized, the Board of Trustees shall have the power to divide or combine the outstanding shares of any class or series of beneficial interest, without a vote of shareholders.

ARTICLE VII

RESTRICTION ON TRANSFER AND OWNERSHIP OF SHARES

Section 7.1 Definitions. For the purpose of this Article VII, the following terms shall have the following meanings:

Aggregate Share Ownership Limit. The term “Aggregate Share Ownership Limit” shall mean not more than 9.8 percent in value of the aggregate of the outstanding Equity Shares. The value of the outstanding Equity Shares shall be determined by the Board of Trustees in good faith, which determination shall be conclusive for all purposes hereof.

Beneficial Ownership. The term “Beneficial Ownership” shall mean ownership of Equity Shares by a Person, whether the interest in Equity Shares is held directly or indirectly (including by a nominee), and shall include interests that would be treated as owned through the application of Section 544 of the Code, as modified by Section 856(h)(1)(B) of the Code. The terms “Beneficial Owner,” “Beneficially Owns” and “Beneficially Owned” shall have the correlative meanings.

Business Day. The term “Business Day” shall mean any day, other than a Saturday or Sunday, that is neither a legal holiday nor a day on which banking institutions in New York City are authorized or required by law, regulation or executive order to close.

Charitable Beneficiary. The term “Charitable Beneficiary” shall mean one or more beneficiaries of the Charitable Trust as determined pursuant to Section 7.3.6, provided that each such organization must be described in Section 501(c)(3) of the Code and contributions to each such organization must be eligible for deduction under each of Sections 170(b)(1)(A), 2055 and 2522 of the Code.

Charitable Trust. The term “Charitable Trust” shall mean any trust provided for in Section 7.3.1.

Code. The term “Code” shall mean the Internal Revenue Code of 1986, as amended from time to time.

Common Share Ownership Limit. The term “Common Share Ownership Limit” shall mean not more than 9.8 percent (in value or in number of shares, whichever is more restrictive) of the aggregate of the outstanding Common Shares. The number and value of outstanding

Common Shares shall be determined by the Board of Trustees in good faith, which determination shall be conclusive for all purposes hereof.

Constructive Ownership. The term “Constructive Ownership” shall mean ownership of Equity Shares by a Person, whether the interest in Equity Shares is held directly or indirectly (including by a nominee), and shall include interests that would be treated as owned through the application of Section 318(a) of the Code, as modified by Section 856(d)(5) of the Code. The terms “Constructive Owner,” “Constructively Owns” and “Constructively Owned” shall have the correlative meanings.

Declaration of Trust. The term “Declaration of Trust” shall mean this Declaration of Trust as filed for record with the SDAT, and any amendments thereto.

Equity Shares. The term “Equity Shares” shall mean all classes or series of Shares, including, without limitation, Common Shares and Preferred Shares.

Excepted Holder. The term “Excepted Holder” shall mean a Permitted Holder or a shareholder of the Trust for whom an Excepted Holder Limit is created by this Article VII or by the Board of Trustees pursuant to Section 7.2.7.

Excepted Holder Limit. The term “Excepted Holder Limit” shall mean, (i) in the case of Permitted Holders, the percentage limit established by the Board of Trustees prior to their becoming shareholders of the Trust, subject to adjustment pursuant to Sections 7.2.7 and 7.2.8 and (ii) in the case of any other Excepted Holder, provided that the affected Excepted Holder agrees to comply with the requirements established by the Board of Trustees pursuant to Section 7.2.7, and subject to adjustment pursuant to Section 7.2.8, the percentage limit established by the Board of Trustees pursuant to Section 7.2.7.

Initial Date. The term “Initial Date” shall mean the date upon which this Declaration of Trust containing this Article VII is filed for record with the SDAT.

Market Price. The term “Market Price” on any date shall mean, with respect to any class or series of outstanding Equity Shares, the Closing Price for such Equity Shares on such date. The “Closing Price” on any date shall mean the last sale price for such Equity Shares, regular way, or, in case no such sale takes place on such day, the average of the closing bid and asked prices, regular way, for such Equity Shares, in either case as reported in the principal consolidated transaction reporting system with respect to the securities listed or admitted to trading on National Market or Small Cap tier of the Nasdaq Stock Market (“Nasdaq-NM”) or, if such Equity Shares are not listed or admitted to trading on the Nasdaq-NM, as reported on the principal consolidated transaction reporting system with respect to the principal national securities exchange on which such Equity Shares are listed or admitted to trading or, if such Equity Shares are not listed or admitted to trading on the Nasdaq-NM or any national securities exchange, the last quoted price, or, if not so quoted, the average of the high bid and low asked prices in the over-the-counter market, as reported by the principal automated quotation system that may then be in use or, if such Equity Shares are not quoted by any such organization, the

average of the closing bid and asked prices as furnished by a professional market maker making a market in such Equity Shares selected by the Board of Trustees or, in the event that no trading price is available for such Equity Shares, the fair market value of Equity Shares, as determined in good faith by the Board of Trustees.

Permitted Holder. The term Permitted Holder shall mean Jay H. Shidler, Clay W. Hamlin, III, Westbrook Real Estate Fund I, L.P. and Westbrook Real Estate Co. Investment Partnership I, L.P. and any corporation, partnership, trust, estate or other legal entity controlled by any of the foregoing persons (or jointly controlled by Messrs. Shidler and Hamlin).

Person. The term “Person” shall mean an individual, corporation, partnership, estate, trust (including a trust qualified under Sections 401(a) or 501(c)(17) of the Code), a portion of a trust permanently set aside for or to be used exclusively for the purposes described in Section 642(c) of the Code, association, private foundation within the meaning of Section 509(a) of the Code, joint stock company or other entity and also includes a group as that term is used for purposes of Section 13(d)(3) of the Securities Exchange Act of 1934, as amended, and a group to which an Excepted Holder Limit applies.

Prohibited Owner. The term “Prohibited Owner” shall mean, with respect to any purported Transfer, any Person who, but for the provisions of Section 7.2.1, would Beneficially Own or Constructively Own Equity Shares, and if appropriate in the context, shall also mean any Person who would have been the record owner of Equity Shares that the Prohibited Owner would have so owned.

REIT. The term “REIT” shall mean a real estate investment trust within the meaning of Section 856 of the Code.

Restriction Termination Date. The term “Restriction Termination Date” shall mean the first day after the Initial Date on which the Board of Trustees determines that it is no longer in the best interests of the Trust to attempt to, or continue to, qualify as a REIT or that compliance with the restrictions and limitations on Beneficial Ownership, Constructive Ownership and Transfers of Equity Shares set forth herein is no longer required in order for the Trust to qualify as a REIT.

SDAT. The term “SDAT” shall mean the State Department of Assessments and Taxation of Maryland.

Transfer. The term “Transfer” shall mean any issuance, sale, transfer, gift, assignment, devise or other disposition, as well as any other event that causes any Person to acquire Beneficial Ownership or Constructive Ownership, or any agreement to take any such actions or cause any such events, of Equity Shares or the right to vote or receive dividends on Equity Shares, including (a) the granting or exercise of any option (or any disposition of any option), (b) any disposition of any securities or rights convertible into or exchangeable for Equity Shares or any interest in Equity Shares or any exercise of any such conversion or exchange right and (c) Transfers of interests in other entities that result in changes in Beneficial or Constructive

Ownership of Equity Shares; in each case, whether voluntary or involuntary, whether owned of record, Constructively Owned or Beneficially Owned and whether by operation of law or otherwise; provided, however, that the term Transfer shall not include the initial issuance of Equity Shares in connection with the indirect merger of Corporate Office Properties Trust, Inc., a Minnesota corporation, with and into the Trust. The terms “Transferring” and “Transferred” shall have the correlative meanings.

Trustee. The term “Trustee” shall mean the Person unaffiliated with the Trust and a Prohibited Owner, that is appointed by the Trust to serve as trustee of the Charitable Trust.

Section 7.2 Equity Shares.

Section 7.2.1 Ownership Limitations. During the period commencing on the Initial Date and prior to the Restriction Termination Date:

(a) Basic Restrictions.

(i) (1) No Person, other than an Excepted Holder, shall Beneficially Own or Constructively Own Equity Shares in excess of the Aggregate Share Ownership Limit, (2) no Person, other than an Excepted Holder, shall Beneficially Own or Constructively Own Common Shares in excess of the Common Share Ownership Limit and (3) no Excepted Holder shall Beneficially Own or Constructively Own Equity Shares in excess of the Excepted Holder Limit for such Excepted Holder.

(ii) No Person shall Beneficially or Constructively Own Equity Shares to the extent that such Beneficial or Constructive Ownership of Equity Shares would result in the Trust being “closely held” within the meaning of Section 856(h) of the Code (without regard to whether the ownership interest is held during the last half of a taxable year), or otherwise failing to qualify as a REIT (including, but not limited to, Beneficial or Constructive Ownership that would result in the Trust owning (actually or Constructively) an interest in a tenant that is described in Section 856(d)(2)(B) of the Code if the income derived by the Trust from such tenant would cause the Trust to fail to satisfy any of the gross income requirements of Section 856(c) of the Code).

(iii) Notwithstanding any other provisions contained herein, any Transfer of Equity Shares (whether or not such Transfer is the result of a transaction entered into through the facilities of the Nasdaq-NM or any other national securities exchange or automated inter-dealer quotation system) that, if effective, would result in Equity Shares being beneficially owned by less than 100 Persons (determined under the principles of Section 856(a)(5) of the Code) shall be void abinitio, and the intended transferee shall acquire no rights in such Equity Shares.

(b) Transfer in Trust. If any Transfer of Equity Shares (whether or not such Transfer is the result of a transaction entered into through the facilities of the NYSE or any other national securities exchange or automated inter-dealer quotation system) occurs which, if

effective, would result in any Person Beneficially Owning or Constructively Owning Equity Shares in violation of Section 7.2.1(a)(i) or (ii),

(i) then that number of Equity Shares the Beneficial or Constructive Ownership of which otherwise would cause such Person to violate Section 7.2.1(a)(i) or (ii) (rounded to the nearest whole share) shall be automatically transferred to a Charitable Trust for the benefit of a Charitable Beneficiary, as described in Section 7.3, effective as of the close of business on the Business Day prior to the date of such Transfer, and such Person shall acquire no rights in such Equity Shares; or

(ii) if the transfer to the Charitable Trust described in clause (i) of this sentence would not be effective for any reason to prevent the violation of Section 7.2.1(a)(i) or (ii), then the Transfer of that number of Equity Shares that otherwise would cause any Person to violate Section 7.2.1(a)(i) or (ii) shall be void abinitio, and the intended transferee shall acquire no rights in such Equity Shares.

Section 7.2.2 Remedies For Breach. If the Board of Trustees or any duly authorized committee thereof shall at any time determine in good faith that a Transfer or other event has taken place that results in a violation of Section 7.2.1 or that a Person intends to acquire or has attempted to acquire Beneficial or Constructive Ownership of any Equity Shares in violation of Section 7.2.1 (whether or not such violation is intended), the Board of Trustees or a committee thereof shall take such action as it deems advisable to refuse to give effect to or to prevent such Transfer or other event, including, without limitation, causing the Trust to redeem Equity Shares, refusing to give effect to such Transfer on the books of the Trust or instituting proceedings to enjoin such Transfer or other event; provided, however, that any Transfers or attempted Transfers or other events in violation of Section 7.2.1 shall automatically result in the transfer to the Charitable Trust described above, and, where applicable, such Transfer (or other event) shall be void abinitio as provided above irrespective of any action (or non-action) by the Board of Trustees or a committee thereof.

Section 7.2.3 Notice of Restricted Transfer. Any Person who, as the result of a Transfer, attempted Transfer or intended Transfer acquires or attempts or intends to acquire Beneficial Ownership or Constructive Ownership of Equity Shares that will or may violate Section 7.2.1(a), or any Person who would have owned Equity Shares that resulted in a transfer to the Charitable Trust pursuant to the provisions of Section 7.2.1(b), shall immediately give written notice to the Trust of such event, or in the case of such a proposed or attempted transaction, give at least 15 days prior written notice, and shall provide to the Trust such other information as the Trust may request in order to determine the effect, if any, of such Transfer on the Trust’s status as a REIT.

Section 7.2.4 Owners Required to Provide Information. From the Initial

Date and prior to the Restriction Termination Date:

(a) every owner of more than five percent (or such other percentage as required by the Code or the Treasury Regulations promulgated thereunder) of the outstanding

Equity Shares, within 30 days after the end of each taxable year, shall give written notice to the Trust stating the name and address of such owner, the number of Equity Shares and other Equity Shares Beneficially Owned and a description of the manner in which such shares are held. Each such owner shall provide to the Trust such additional information as the Trust may request in order to determine the effect, if any, of such Beneficial Ownership on the Trust’s status as a REIT and to ensure compliance with the Aggregate Share Ownership Limit.

(b) each Person who is a Beneficial or Constructive Owner of Equity Shares and each Person (including the shareholder of record) who is holding Equity Shares for a Beneficial or Constructive Owner shall provide to the Trust such information as the Trust may request, in good faith, in order to determine the Trust’s status as a REIT and to comply with requirements of any taxing authority or governmental authority or to determine such compliance.

Section 7.2.5 Remedies Not Limited. Subject to Section 5.1 of the Declaration of Trust, nothing contained in this Section 7.2 shall limit the authority of the Board of Trustees to take such other action as it deems necessary or advisable to protect the Trust and the interests of its shareholders in preserving the Trust’s status as a REIT.

Section 7.2.6 Ambiguity. In the case of an ambiguity in the application of any of the provisions of this Section 7.2, Section 7.3 or any definition contained in Section 7.1, the Board of Trustees shall have the power to determine the application of the provisions of this Section 7.2 or Section 7.3 or any such definition with respect to any situation based on the facts known to it. In the event Section 7.2 or 7.3 requires an action by the Board of Trustees and the Declaration of Trust fails to provide specific guidance with respect to such action, the Board of Trustees shall have the power to determine the action to be taken so long as such action is not contrary to the provisions of Sections 7.1, 7.2 or 7.3.

Section 7.2.7 Exceptions.

(a) Subject to Section 7.2.1(a)(ii), the Board of Trustees, in its sole discretion, may exempt a Person from the Aggregate Share Ownership Limit and the Common Share Ownership Limit, as the case may be, and may establish or increase an Excepted Holder Limit for a Person (including a Permitted Holder) if:

(i) the Board of Trustees obtains such representations and undertakings from such Person as are reasonably necessary to ascertain that no individual’s Beneficial or Constructive Ownership of such Equity Shares will violate Section 7.2.1(a)(ii);

(ii) such Person does not and represents that it will not own, actually or Constructively, an interest in a tenant of the Trust (or a tenant of any entity owned or controlled by the Trust) that would cause the Trust to own, actually or Constructively, more than a 9.9% interest (as set forth in Section 856(d)(2)(B) of the Code) in such tenant and the Board of Trustees obtains such representations and undertakings from such Person as are reasonably necessary to ascertain this fact (for this purpose, a tenant from whom the Trust (or an entity owned or controlled by the Trust) derives (and is expected to continue to derive) a sufficiently

small amount of revenue such that, in the opinion of the Board of Trustees, rent from such tenant would not adversely affect the Trust’s ability to qualify as a REIT, shall not be treated as a tenant of the Trust); and

(iii) such Person agrees that any violation or attempted violation of such representations or undertakings (or other action which is contrary to the restrictions contained in Sections 7.2.1 through 7.2.6) will result in such Equity Shares being automatically transferred to a Charitable Trust in accordance with Sections 7.2.1(b) and 7.3.

(b) Prior to granting any exception pursuant to Section 7.2.7(a), the Board of Trustees may require a ruling from the Internal Revenue Service, or an opinion of counsel, in either case in form and substance satisfactory to the Board of Trustees in its sole discretion, as it may deem necessary or advisable in order to determine or ensure the Trust’s status as a REIT. Notwithstanding the receipt of any ruling or opinion, the Board of Trustees may impose such conditions or restrictions as it deems appropriate in connection with granting such exception.

(c) Subject to Section 7.2.1(a)(ii), an underwriter which participates in a public offering or a private placement of Equity Shares (or securities convertible into or exchangeable for Equity Shares) may Beneficially Own or Constructively Own Equity Shares (or securities convertible into or exchangeable for Equity Shares) in excess of the Aggregate Share Ownership Limit, the Common Share Ownership Limit or both such limits, but only to the extent necessary to facilitate such public offering or private placement.

(d) The Board of Trustees may only reduce the Excepted Holder Limit for an Excepted Holder: (1) with the written consent of such Excepted Holder at any time, or (2) pursuant to the terms and conditions of the agreements and undertakings entered into with such Excepted Holder in connection with the establishment of the Excepted Holder Limit for that Excepted Holder. No Excepted Holder Limit shall be reduced to a percentage that is less than the Common Share Ownership Limit.

Section 7.2.8 Increase in Aggregate Share Ownership and Common Share

Ownership Limits. The Board of Trustees may from time to time increase the Common Share Ownership Limit and the Aggregate Share Ownership Limit.

Section 7.2.9 Legend. Each certificate for Equity Shares shall bear substantially the following legend:

The shares represented by this Certificate are subject to restrictions on Beneficial Ownership, Constructive Ownership and Transfer for the purpose of the Trust’s maintenance of its status as a real estate investment trust (a “REIT”) under the Internal Revenue Code of 1986, as amended (the “Code”). Subject to certain further restrictions and except as expressly provided in the Declaration of Trust of the Trust (i) no Person may Beneficially Own or Constructively Own Common Shares of the Trust in excess of 9.8 percent (in value or number of

shares) of the outstanding Common Shares of the Trust unless such Person is an Excepted Holder or a Permitted Holder (in which case the Excepted Holder Limit shall be applicable); (ii) no Person may Beneficially Own or Constructively Own Equity Shares of the Trust in excess of 9.8 percent of the value of the total outstanding Equity Shares of the Trust, unless such Person is an Excepted Holder or a Permitted Holder (in which case the Excepted Holder Limit shall be applicable); (iii) no Person may Beneficially Own or Constructively Own Equity Shares that would result in the Trust being “closely held” under Section 856(h) of the Code or otherwise cause the Trust to fail to qualify as a REIT; and (iv) no Person may Transfer Equity Shares if such Transfer would result in Equity Shares of the Trust being owned by fewer than 100 Persons. Any Person who Beneficially Owns or Constructively Owns or attempts to Beneficially Own or Constructively Own Equity Shares which cause or will cause a Person to Beneficially Own or Constructively Own Equity Shares in excess or in violation of the above limitations must immediately notify the Trust. If any of the restrictions on transfer or ownership are violated, the Equity Shares represented hereby will be automatically transferred to a Trustee of a Charitable Trust for the benefit of one or more Charitable Beneficiaries. In addition, upon the occurrence of certain events, attempted Transfers in violation of the restrictions described above may be void abinitio. All capitalized terms in this legend have the meanings defined in the Declaration of Trust of the Trust, as the same may be amended from time to time, a copy of which, including the restrictions on transfer and ownership, will be furnished to each holder of Equity Shares of the Trust on request and without charge.

Instead of the foregoing legend, the certificate may state that the Trust will furnish a full statement about certain restrictions on transferability to a shareholder on request and without charge.

Section 7.3 Transfer of Equity Shares in Trust.

Section 7.3.1 Ownership In Trust. Upon any purported Transfer or other event described in Section 7.2.1(b) that would result in a transfer of Equity Shares to a Charitable Trust, such Equity Shares shall be deemed to have been transferred to the Trustee as trustee of a Charitable Trust for the exclusive benefit of one or more Charitable Beneficiaries. Such transfer to the Trustee shall be deemed to be effective as of the close of business on the Business Day prior to the purported Transfer or other event that results in the transfer to the Charitable Trust pursuant to Section 7.2.1(b). The Trustee shall be appointed by the Trust and shall be a Person unaffiliated with the Trust and any Prohibited Owner. Each Charitable Beneficiary shall be designated by the Trust as provided in Section 7.3.6.

Section 7.3.2 Status of Shares Held by the Trustee. Equity Shares held by the Trustee shall be issued and outstanding Equity Shares of the Company. The Prohibited Owner shall have no rights in the shares held by the Trustee. The Prohibited Owner shall not benefit economically from ownership of any shares held in trust by the Trustee, shall have no rights to dividends or other distributions and shall not possess any rights to vote or other rights attributable to the shares held in the Charitable Trust.

Section 7.3.3 Dividend and Voting Rights. The Trustee shall have all voting rights and rights to dividends or other distributions with respect to Equity Shares held in the Charitable Trust, which rights shall be exercised for the exclusive benefit of the Charitable Beneficiary. Any dividend or other distribution paid prior to the discovery by the Trust that Equity Shares have been transferred to the Trustee shall be paid with respect to such Equity Shares to the Trustee upon demand and any dividend or other distribution authorized but unpaid shall be paid when due to the Trustee. Any dividends or distributions so paid over to the Trustee shall be held in trust for the Charitable Beneficiary. The Prohibited Owner shall have no voting rights with respect to shares held in the Charitable Trust and, subject to Maryland law, effective as of the date that Equity Shares have been transferred to the Trustee, the Trustee shall have the authority (at the Trustee’s sole discretion) (i) to rescind as void any vote cast by a Prohibited Owner prior to the discovery by the Trust that Equity Shares have been transferred to the Trustee and (ii) to recast such vote in accordance with the desires of the Trustee acting for the benefit of the Charitable Beneficiary; provided, however, that if the Company has already taken irreversible trust action, then the Trustee shall not have the authority to rescind and recast such vote. Notwithstanding the provisions of this Article VII, until the Trust has received notification that Equity Shares have been transferred into a Charitable Trust, the Trust shall be entitled to rely on its share transfer and other shareholder records for purposes of preparing lists of shareholders entitled to vote at meetings, determining the validity and authority of proxies and otherwise conducting votes of shareholders.

Section 7.3.4 Sale of Shares by Trustee. Within 20 days of receiving notice from the Trust that Equity Shares have been transferred to the Charitable Trust, the Trustee of the Charitable Trust shall sell the shares held in the Charitable Trust to a person, designated by the Trustee, whose ownership of the shares will not violate the ownership limitations set forth in Section 7.2.1(a). Upon such sale, the interest of the Charitable Beneficiary in the shares sold shall terminate and the Trustee shall distribute the net proceeds of the sale to the Prohibited Owner and to the Charitable Beneficiary as provided in this Section 7.3.4. The Prohibited Owner shall receive the lesser of (1) the price paid by the Prohibited Owner for the shares or, if the Prohibited Owner did not give value for the shares in connection with the event causing the shares to be held in the Charitable Trust (e.g., in the case of a gift, devise or other such transaction), the Market Price of the shares on the day of the event causing the shares to be held in the Charitable Trust and (2) the price per share received by the Trustee from the sale or other disposition of the shares held in the Charitable Trust. Any net sales proceeds in excess of the amount payable to the Prohibited Owner shall be immediately paid to the Charitable Beneficiary. If, prior to the discovery by the Trust that Equity Shares have been transferred to the Trustee, such shares are sold by a Prohibited Owner, then (i) such shares shall be deemed to have been sold on behalf of the Charitable Trust and (ii) to the extent that the Prohibited Owner received an

amount for such shares that exceeds the amount that such Prohibited Owner was entitled to receive pursuant to this Section 7.3.4, such excess shall be paid to the Trustee upon demand.

Section 7.3.5 Purchase Right in Shares Transferred to the Trustee. Equity Shares transferred to the Trustee shall be deemed to have been offered for sale to the Trust, or its designee, at a price per share equal to the lesser of (i) the price per share in the transaction that resulted in such transfer to the Charitable Trust (or, in the case of a devise or gift, the Market Price at the time of such devise or gift) and (ii) the Market Price on the date the Trust, or its designee, accepts such offer. The Trust shall have the right to accept such offer until the Trustee has sold the shares held in the Charitable Trust pursuant to Section 7.3.4. Upon such a sale to the Trust, the interest of the Charitable Beneficiary in the shares sold shall terminate and the Trustee shall distribute the net proceeds of the sale to the Prohibited Owner.

Section 7.3.6 Designation of Charitable Beneficiaries. By written notice to the Trustee, the Trust shall designate one or more nonprofit organizations to be the Charitable Beneficiary of the interest in the Charitable Trust such that (i) Equity Shares held in the Charitable Trust would not violate the restrictions set forth in Section 7.2.1(a) in the hands of such Charitable Beneficiary and (ii) each such organization must be described in Section 501(c)(3) of the Code and contributions to each such organization must be eligible for deduction under each of Sections 170(b)(1)(A), 2055 and 2522 of the Code.

Section 7.4 Nasdaq-NM Transactions. Nothing in this Article VII shall preclude the settlement of any transaction entered into through the facilities of the Nasdaq-NM or any other national securities exchange or automated inter-dealer quotation system. The fact that the settlement of any transaction is so permitted shall not negate the effect of any other provision of this Article VII and any transferee in such a transaction shall be subject to all of the provisions and limitations set forth in this Article VII.

Section 7.5 Enforcement. The Trust is authorized specifically to seek equitable relief, including injunctive relief, to enforce the provisions of this Article VII.

Section 7.6 Non-Waiver. No delay or failure on the part of the Trust or the Board of Trustees in exercising any right hereunder shall operate as a waiver of any right of the Trust or the Board of Trustees, as the case may be, except to the extent specifically waived in writing.

ARTICLE VIII

SHAREHOLDERS

Section 8.1 Meetings. There shall be an annual meeting of the shareholders, commencing with the calendar year 1999, to be held on proper notice at such time (after the delivery of the annual report) and convenient location as shall be determined by or in the manner prescribed in the Bylaws, for the election of the Trustees, if required, and for the transaction of any other business within the powers of the Trust. Except as otherwise provided in the Declaration of Trust or as specifically required by law, special meetings of shareholders may only be called in the manner provided in the Bylaws. If there are no Trustees, the officers of the

Trust shall promptly call a special meeting of the shareholders entitled to vote for the election of successor Trustees. Any meeting may be adjourned and reconvened as the Trustees determine or as provided in the Bylaws.

Section 8.2 Voting Rights. Subject to the provisions of any class or series of Shares then outstanding, the shareholders shall be entitled to vote only on the following matters: (a) election of Trustees as provided in Section 5.2 and the removal of Trustees as provided in Section 5.3; (b) amendment of the Declaration of Trust as provided in Article X; (c) termination of the Trust as provided in Section 10.3; (d) merger or consolidation of the Trust, or the sale or disposition of substantially all of the Trust Property, as provided in Article XI; and (e) such other matters with respect to which the Board of Trustees has adopted a resolution declaring that a proposed action is advisable and directing that the matter be submitted to the shareholders for approval or ratification. Except with respect to the foregoing matters, no action taken by the shareholders at any meeting or by consent shall in any way bind the Board of Trustees.

Section 8.3 Preemptive and Appraisal Rights. Except as may be provided by the Board of Trustees in setting the terms of classified or reclassified Shares pursuant to Section 6.4, no holder of Shares shall, as such holder, (a) have any preemptive right to purchase or subscribe for any additional Shares of the Trust or any other security of the Trust which it may issue or sell or (b), except as expressly required by Title 8, have any right to require the Trust to pay him the fair value of his Shares in an appraisal or similar proceeding.

Section 8.4 Extraordinary Actions. Except as specifically provided in Section 5.3 (relating to removal of Trustees), in Article X (relating to amendments to this Declaration of Trust), in Article XI (relating to mergers, consolidations or sales of trust property), and in Section 12.2 (relating to termination of the Trust) and except for any deletion or modification of the foregoing references in this Section 8.4, notwithstanding any provision of law permitting or requiring any action to be taken or authorized by the affirmative vote of the holders of a greater number of votes, any such action shall be effective and valid if taken or authorized by the affirmative vote of holders of Shares entitled to cast a majority of all the votes entitled to be cast on the matter.

Section 8.5 Board Approval. The submission of any action to the shareholders for their consideration shall first be approved by the Board of Trustees.

Section 8.6 Action by Shareholders without a Meeting. The Bylaws of the Trust may provide that any action required or permitted to be taken by the shareholders may be taken without a meeting by the written consent of all shareholders entitled to cast votes on the matter.

ARTICLE IX

LIABILITY LIMITATION, INDEMNIFICATION

AND TRANSACTIONS WITH THE TRUST

Section 9.1 Limitation of Shareholder Liability. No shareholder shall be liable for any debt, claim, demand, judgment or obligation of any kind of, against or with respect to the Trust

by reason of his being a shareholder, nor shall any shareholder be subject to any personal liability whatsoever, in tort, contract or otherwise, to any person in connection with the property or the affairs of the Trust by reason of his being a shareholder.

Section 9.2 Limitation of Trustee and Officer Liability. To the maximum extent that Maryland law in effect from time to time permits limitation of the liability of trustees and officers of a real estate investment trust, no Trustee or officer of the Trust shall be liable to the Trust or to any shareholder for money damages. Neither the amendment nor repeal of this Section 9.2, nor the adoption or amendment of any other provision of the Declaration of Trust inconsistent with this Section 9.2, shall apply to or affect in any respect the applicability of the preceding sentence with respect to any act or failure to act which occurred prior to such amendment, repeal or adoption. In the absence of any Maryland statute limiting the liability of trustees and officers of a Maryland real estate investment trust for money damages in a suit by or on behalf of the Trust or by any shareholder, no Trustee or officer of the Trust shall be liable to the Trust or to any shareholder for money damages except to the extent that (a) the Trustee or officer actually received an improper benefit or profit in money, property, or services, for the amount of the benefit or profit in money, property, or services actually received; or (b) a judgment or other final adjudication adverse to the Trustee or officer is entered in a proceeding based on a finding in the proceeding that the Trustee’s or officer’s action or failure to act was the result of active and deliberate dishonesty and was material to the cause of action adjudicated in the proceeding.

Section 9.3 Indemnification. The Trust shall have the power, to the maximum extent permitted by Maryland law in effect from time to time, to obligate itself to indemnify, and to pay or reimburse reasonable expenses in advance of final disposition of a proceeding to, (a) any individual who is a present or former shareholder, Trustee or officer of the Trust or (b) any individual who, while a Trustee of the Trust and at the request of the Trust, serves or has served as a director, officer, partner, trustee, employee or agent of another real estate investment trust, corporation, partnership, joint venture, trust, employee benefit plan or any other enterprise from and against any claim or liability to which such person may become subject or which such person may incur by reason of his status as a present or former shareholder, Trustee or officer of the Trust. The Trust shall have the power, with the approval of its Board of Trustees, to provide such indemnification and advancement of expenses to a person who served a predecessor of the Trust in any of the capacities described in (a) or (b) above and to any employee or agent of the Trust or a predecessor of the Trust.

Section 9.4 Transactions Between the Trust and its Trustees, Officers, Employees and Agents. Subject to any express restrictions in the Declaration of Trust or adopted by the Trustees in the Bylaws or by resolution, the Trust may enter into any contract or transaction of any kind with any person, including any Trustee, officer, employee or agent of the Trust or any person affiliated with a Trustee, officer, employee or agent of the Trust, whether or not any of them has a financial interest in such transaction.

ARTICLE X

AMENDMENTS

Section 10.1 General. The Trust reserves the right from time to time to make any amendment to the Declaration of Trust, now or hereafter authorized by law, including any amendment altering the terms or contract rights, as expressly set forth in the Declaration of Trust, of any Shares. All rights and powers conferred by the Declaration of Trust on shareholders, Trustees and officers are granted subject to this reservation. An amendment to the Declaration of Trust (a) shall be signed and acknowledged by at least a majority of the Trustees, or an officer duly authorized by at least a majority of the Trustees, (b) shall be filed for record as provided in Section 13.5 and (c) shall become effective as of the later of the time the SDAT accepts the amendment for record or the time established in the amendment, not to exceed 30 days after the amendment is accepted for record. All references to the Declaration of Trust shall include all amendments thereto.

Section 10.2 By Trustees. The Trustees may amend the Declaration of Trust from time to time, in the manner provided by Title 8, without any action by the shareholders, to qualify as a real estate investment trust under the Code or under Title 8 and as otherwise provided in the Declaration of Trust.

Section 10.3 By Shareholders. Except as otherwise provided in the Declaration of Trust, any amendment to the Declaration of Trust shall be valid only if approved by the affirmative vote of at least two-thirds of all the votes entitled to be cast on the matter.

ARTICLE XI

MERGER, CONSOLIDATION OR SALE OF TRUST PROPERTY

Subject to the provisions of any class or series of Shares at the time outstanding, the Trust may (a) merge the Trust into another entity, (b) consolidate the Trust with one or more other entities into a new entity or (c) sell, lease, exchange or otherwise transfer all or substantially all of the Trust Property. Any such action must be approved by the Board of Trustees and, after notice to all shareholders entitled to vote on the matter, by the affirmative vote of a majority of all the votes entitled to be cast on the matter.

ARTICLE XII

DURATION AND TERMINATION OF TRUST

Section 12.1 Duration. The Trust shall continue perpetually unless terminated pursuant to Section 12.2 or pursuant to any applicable provision of

Title 8.

Section 12.2 Termination.

(a) Subject to the provisions of any class or series of Shares at the time outstanding, the Trust may be terminated at any meeting of shareholders, by the affirmative vote of two-thirds of all the votes entitled to be cast on the matter. Upon the termination of the Trust:

(i) The Trust shall carry on no business except for the purpose of winding up its affairs.

(ii) The Trustees shall proceed to wind up the affairs of the Trust and all of the powers of the Trustees under the Declaration of Trust shall continue, including the powers to fulfill or discharge the Trust’s contracts, collect its assets, sell, convey, assign, exchange, transfer or otherwise dispose of all or any part of the remaining property of the Trust to one or more persons at public or private sale for consideration which may consist in whole or in part of cash, securities or other property of any kind, discharge or pay its liabilities and do all other acts appropriate to liquidate its business.

(iii) After paying or adequately providing for the payment of all liabilities, and upon receipt of such releases, indemnities and agreements as they deem necessary for their protection, the Trust may distribute the remaining property of the Trust among the shareholders so that after payment in full or the setting apart for payment of such preferential amounts, if any, to which the holders of any Shares at the time outstanding shall be entitled, the remaining property of the Trust shall, subject to any participating or similar rights of Shares at the time outstanding, be distributed ratably among the holders of Common Shares at the time outstanding.

(b) After termination of the Trust, the liquidation of its business and the distribution to the shareholders as herein provided, a majority of the Trustees shall execute and file with the Trust’s records a document certifying that the Trust has been duly terminated, and the Trustees shall be discharged from all liabilities and duties hereunder, and the rights and interests of all shareholders shall cease.

ARTICLE XIII

MISCELLANEOUS

Section 13.1 Governing Law. The Declaration of Trust is executed by the undersigned Trustees and delivered in the State of Maryland with reference to the laws thereof, and the rights of all parties and the validity, construction and effect of every provision hereof shall be subject to and construed according to the laws of the State of Maryland without regard to conflicts of laws provisions thereof.

Section 13.2 Reliance by Third Parties. Any certificate shall be final and conclusive as to any person dealing with the Trust if executed by the Secretary or an Assistant Secretary of the Trust or a Trustee, and if certifying to: (a) the number or identity of Trustees, officers of the Trust or shareholders; (b) the due authorization of the execution of any document; (c) the action or vote taken, and the existence of a quorum, at a meeting of the Board of Trustees or shareholders;

(d) a copy of the Declaration of Trust or of the Bylaws as a true and complete copy as then in force; (e) an amendment to the Declaration of Trust; (f) the termination of the Trust; or (g) the existence of any fact relating to the affairs of the Trust. No purchaser, lender, transfer agent or other person shall be bound to make any inquiry concerning the validity of any transaction purporting to be made by the Trust on its behalf or by any officer, employee or agent of the Trust.

Section 13.3 Severability.

(a) The provisions of the Declaration of Trust are severable, and if the Board of Trustees shall determine, with the advice of counsel, that any one or more of such provisions (the “Conflicting Provisions”) are in conflict with the Code, Title 8 or other applicable federal or state laws, the Conflicting Provisions, to the extent of the conflict, shall be deemed never to have constituted a part of the Declaration of Trust, even without any amendment of the Declaration of Trust pursuant to Article X and without affecting or impairing any of the remaining provisions of the Declaration of Trust or rendering invalid or improper any action taken or omitted prior to such determination. No Trustee shall be liable for making or failing to make such a determination. In the event of any such determination by the Board of Trustees, the Board shall amend the Declaration of Trust in the manner provided in Section 10.2.

(b) If any provision of the Declaration of Trust shall be held invalid or unenforceable in any jurisdiction, such holding shall apply only to the extent of any such invalidity or unenforceability and shall not in any manner affect, impair or render invalid or unenforceable such provision in any other jurisdiction or any other provision of the Declaration of Trust in any jurisdiction.

Section 13.4 Construction. In the Declaration of Trust, unless the context otherwise requires, words used in the singular or in the plural include both the plural and singular and words denoting any gender include all genders. The title and headings of different parts are inserted for convenience and shall not affect the meaning, construction or effect of the Declaration of Trust. In defining or interpreting the powers and duties of the Trust and its Trustees and officers, reference may be made by the Trustees or officers, to the extent appropriate and not inconsistent with the Code or Title 8, to Titles 1 through 3 of the Corporations and Associations Article of the Annotated Code of Maryland. In furtherance and not in limitation of the foregoing, in accordance with the provisions of Title 3, Subtitles 6 and 7, of the Corporations and Associations Article of the Annotated Code of Maryland, the Trust shall be included within the definition of “corporation” for purposes of such provisions.

Section 13.5 Recordation. The Declaration of Trust and any amendment hereto shall be filed for record with the SDAT and may also be filed or recorded in such other places as the Trustees deem appropriate, but failure to file for record the Declaration of Trust or any amendment hereto in any office other than in the State of Maryland shall not affect or impair the validity or effectiveness of the Declaration of Trust or any amendment hereto. A restated Declaration of Trust shall, upon filing, be conclusive evidence of all amendments contained therein and may thereafter be referred to in lieu of the original Declaration of Trust and the various amendments thereto.

EX-12.1

EXHIBIT 12.1

Corporate Office Properties Trust

Ratio of Earnings to Combined Fixed Charges and Preferred Share Dividends

(Dollars in thousands)

	Six Months Ended June 30, 2018
Earnings:
Income before equity in income of unconsolidated entities and income taxes	$	39,264
Gain on sales of real estate	(27		)
Combined fixed charges and preferred share dividends (from below)	41,157
Amortization of capitalized interest	1,332
Distributed income of equity investees	749
Subtract:
Capitalized interest (from below)	(2,771		)
Preferred unit distributions included in fixed charges	(330		)
Preferred distributions of other consolidated entities	(7		)
Total earnings	$	79,367
Combined Fixed Charges and Preferred Share Dividends:
Combined fixed charges and preferred share dividends:
Interest expense	$	37,729
Capitalized interest (internal and external)	2,771
Interest included in rental expense	320
Preferred unit distributions	330
Preferred distributions of other consolidated entities	7
Total combined fixed charges and preferred share dividends	$	41,157
Ratio of earnings to combined fixed charges and preferred share dividends	1.93

For purposes of calculating the above ratios, earnings were computed by adding fixed charges (excluding capitalized interest), gain on sales of real estate, 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)

	Six Months Ended June 30, 2018
Earnings:
Income before equity in income of unconsolidated entities and income taxes	$	39,264
Gain on sales of real estate	(27		)
Fixed charges (from below)	40,827
Amortization of capitalized interest	1,332
Distributed income of equity investees	749
Subtract:
Capitalized interest (from below)	(2,771		)
Preferred distributions of other consolidated entities	(7		)
Total earnings	$	79,367
Fixed charges:
Interest expense	$	37,729
Capitalized interest (internal and external)	2,771
Interest included in rental expense	320
Preferred distributions of other consolidated entities	7
Total fixed charges	$	40,827
Ratio of earnings to fixed charges	1.94

For purposes of calculating the above ratios, earnings were computed by adding fixed charges (excluding capitalized interest), gain on sales of real estate, 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:	July 31, 2018	/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:	July 31, 2018	/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:	July 31, 2018	/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:	July 31, 2018	/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 June 30, 2018, 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:	July 31, 2018

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 June 30, 2018, 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:	July 31, 2018

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 June 30, 2018, 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:	July 31, 2018

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 June 30, 2018, 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:	July 31, 2018

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 20, 2018
Entity Information [Line Items]
Entity Registrant Name	CORPORATE OFFICE PROPERTIES TRUST
Entity Central Index Key	0000860546
Document Type	10-Q
Document Period End Date	Jun. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		103,263,449
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
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	Jun. 30, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Properties, net:
Operating properties, net	$ 2,760,632	$ 2,737,611
Projects in development or held for future development	422,905	403,494
Total properties, net	3,183,537	3,141,105
Assets held for sale, net	42,226	42,226
Cash and cash equivalents	8,472	12,261
Investment in unconsolidated real estate joint venture	40,806	41,787
Accounts receivable (net of allowance for doubtful accounts of $811 and $607, respectively)	23,656	31,802
Deferred rent receivable (net of allowance of $423 and $364, respectively)	89,606	86,710
Intangible assets on real estate acquisitions, net	50,586	59,092
Deferred leasing costs (net of accumulated amortization of $29,546 and $29,560, respectively)	48,183	48,322
Investing receivables	54,427	57,493
Prepaid expenses and other assets, net	70,863	74,407
Total assets	3,612,362	3,595,205
Liabilities:
Debt, net	1,871,445	1,828,333
Accounts payable and accrued expenses	88,885	108,137
Rents received in advance and security deposits	24,905	25,648
Dividends and distributions payable	29,449	28,921
Deferred revenue associated with operating leases	10,783	11,682
Deferred property sale	43,377	43,377
Capital lease obligation	640	15,853
Other liabilities	9,849	41,822
Total liabilities	2,079,333	2,103,773
Commitments and contingencies (Note 16)
Redeemable noncontrolling interests	24,544	23,125
Corporate Office Properties Trust’s shareholders’ equity:
Common Shares of beneficial interest	1,033	1,013
Additional paid-in capital	2,254,430	2,201,047
Cumulative distributions in excess of net income	(822,270)	(802,085)
Accumulated other comprehensive income	9,012	2,167
Total Corporate Office Properties Trust’s shareholders’ equity	1,442,205	1,402,142
Noncontrolling interests in subsidiaries:
Common units in COPLP	44,651	45,097
Preferred units in COPLP	8,800	8,800
Other consolidated entities	12,829	12,268
Noncontrolling interests in subsidiaries	66,280	66,165
Total equity	1,508,485	1,468,307
Total liabilities, redeemable noncontrolling interests and equity	3,612,362	3,595,205
Corporate Office Properties, L.P.
Properties, net:
Operating properties, net	2,760,632	2,737,611
Projects in development or held for future development	422,905	403,494
Total properties, net	3,183,537	3,141,105
Assets held for sale, net	42,226	42,226
Cash and cash equivalents	8,472	12,261
Investment in unconsolidated real estate joint venture	40,806	41,787
Accounts receivable (net of allowance for doubtful accounts of $811 and $607, respectively)	23,656	31,802
Deferred rent receivable (net of allowance of $423 and $364, respectively)	89,606	86,710
Intangible assets on real estate acquisitions, net	50,586	59,092
Deferred leasing costs (net of accumulated amortization of $29,546 and $29,560, respectively)	48,183	48,322
Investing receivables	54,427	57,493
Prepaid expenses and other assets, net	66,669	69,791
Total assets	3,608,168	3,590,589
Liabilities:
Debt, net	1,871,445	1,828,333
Accounts payable and accrued expenses	88,885	108,137
Rents received in advance and security deposits	24,905	25,648
Dividends and distributions payable	29,449	28,921
Deferred revenue associated with operating leases	10,783	11,682
Deferred property sale	43,377	43,377
Capital lease obligation	640	15,853
Other liabilities	5,655	37,206
Total liabilities	2,075,139	2,099,157
Commitments and contingencies (Note 16)
Redeemable noncontrolling interests	24,544	23,125
Corporate Office Properties Trust’s shareholders’ equity:
Common Shares of beneficial interest	1,477,575	1,445,022
Accumulated other comprehensive income	9,235	2,173
Total Corporate Office Properties Trust’s shareholders’ equity	1,495,610	1,455,995
Noncontrolling interests in subsidiaries:
Noncontrolling interests in subsidiaries	12,875	12,312
Total equity	1,508,485	1,468,307
Total liabilities, redeemable noncontrolling interests and equity	3,608,168	3,590,589
Limited Partner | Corporate Office Properties, L.P.
Corporate Office Properties Trust’s shareholders’ equity:
Preferred units held by limited partner, 352,000 preferred units outstanding at June 30, 2018 and December 31, 2017	$ 8,800	$ 8,800

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Allowance for doubtful accounts - AR	$ 811	$ 607
Deferred rent receivable	423	364
Deferred leasing costs, accumulated amortization	$ 29,546	$ 29,560
Common Shares of beneficial interest, par value (in dollars per share)	$ 0.01	$ 0.01
Common Shares of beneficial interest, shares authorized	150,000,000	150,000,000
Common Shares of beneficial interest, shares issued	103,260,495	101,292,299
Common Shares of beneficial interest, shares outstanding	103,260,495	101,292,299
Corporate Office Properties, L.P.
Allowance for doubtful accounts - AR	$ 811	$ 607
Deferred rent receivable	423	364
Deferred leasing costs, accumulated amortization	$ 29,546	$ 29,560
Corporate Office Properties, L.P. | General Partner
Common Shares of beneficial interest, shares outstanding	103,260,495	101,292,299
Corporate Office Properties, L.P. | Limited Partner
Common Shares of beneficial interest, shares outstanding	3,197,061	3,250,878
Preferred Units, Outstanding	352,000	352,000

XML

Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues
Rental revenue	$ 101,121	$ 101,347	$ 201,955	$ 201,962
Tenant recoveries and other real estate operations revenue	28,041	26,950	55,485	53,102
Construction contract and other service revenues	17,581	23,138	44,779	36,172
Total revenues	146,743	151,435	302,219	291,236
Expenses
Property operating expenses	49,446	48,628	100,397	97,147
Depreciation and amortization associated with real estate operations	33,190	32,793	66,702	65,852
Construction contract and other service expenses	16,941	22,315	43,157	34,801
Impairment losses	0	1,625	0	1,625
General, administrative and leasing expenses	7,628	7,859	14,920	16,470
Business development expenses and land carry costs	1,234	1,597	2,848	3,290
Total operating expenses	108,439	114,817	228,024	219,185
Operating income	38,304	36,618	74,195	72,051
Interest expense	(18,945)	(19,163)	(37,729)	(38,157)
Interest and other income	1,439	1,583	2,798	3,309
Loss on early extinguishment of debt	0	(513)	0	(513)
Income before equity in income of unconsolidated entities and income taxes	20,798	18,525	39,264	36,690
Equity in income of unconsolidated entities	373	370	746	747
Income tax expense	(63)	(48)	(118)	(88)
Income before gain on sales of real estate	21,108	18,847	39,892	37,349
Gain on sales of real estate	(23)	12	(27)	4,250
Net income	21,085	18,859	39,865	41,599
Net income attributable to noncontrolling interests:
Common units in COPLP	(608)	(261)	(1,152)	(883)
Preferred units in COPLP	(165)	(165)	(330)	(330)
Other consolidated entities	(878)	(907)	(1,799)	(1,841)
Net income attributable to COPT	19,434	17,526	36,584	38,545
'Preferred share/unit dividends/distributions	0	(3,039)	0	(6,219)
Issuance costs associated with redeemed preferred shares/units	0	(6,847)	0	(6,847)
Net income attributable to COPT common shareholders	$ 19,434	$ 7,640	$ 36,584	$ 25,479
Earnings per common share:
Net income attributable to COPT common shareholders - basic (in dollars per share/unit)	$ 0.19	$ 0.08	$ 0.36	$ 0.26
Net income attributable to COPT common shareholders - diluted (in dollars per share/unit)	0.19	0.08	0.36	0.26
Dividends declared per common share/unit (in dollars per share)	$ 0.2750	$ 0.275	$ 0.55	$ 0.55
Corporate Office Properties, L.P.
Revenues
Rental revenue	$ 101,121	$ 101,347	$ 201,955	$ 201,962
Tenant recoveries and other real estate operations revenue	28,041	26,950	55,485	53,102
Construction contract and other service revenues	17,581	23,138	44,779	36,172
Total revenues	146,743	151,435	302,219	291,236
Expenses
Property operating expenses	49,446	48,628	100,397	97,147
Depreciation and amortization associated with real estate operations	33,190	32,793	66,702	65,852
Construction contract and other service expenses	16,941	22,315	43,157	34,801
Impairment losses	0	1,625	0	1,625
General, administrative and leasing expenses	7,628	7,859	14,920	16,470
Business development expenses and land carry costs	1,234	1,597	2,848	3,290
Total operating expenses	108,439	114,817	228,024	219,185
Operating income	38,304	36,618	74,195	72,051
Interest expense	(18,945)	(19,163)	(37,729)	(38,157)
Interest and other income	1,439	1,583	2,798	3,309
Loss on early extinguishment of debt	0	(513)	0	(513)
Income before equity in income of unconsolidated entities and income taxes	20,798	18,525	39,264	36,690
Equity in income of unconsolidated entities	373	370	746	747
Income tax expense	(63)	(48)	(118)	(88)
Income before gain on sales of real estate	21,108	18,847	39,892	37,349
Gain on sales of real estate	(23)	12	(27)	4,250
Net income	21,085	18,859	39,865	41,599
Net income attributable to noncontrolling interests:
Net income attributable to noncontrolling interests in consolidated entities	(878)	(907)	(1,799)	(1,841)
Net income attributable to COPT	20,207	17,952	38,066	39,758
'Preferred share/unit dividends/distributions	(165)	(3,204)	(330)	(6,549)
Issuance costs associated with redeemed preferred shares/units	0	(6,847)	0	(6,847)
Net income attributable to COPT common shareholders	$ 20,042	$ 7,901	$ 37,736	$ 26,362
Earnings per common share:
Net income attributable to COPT common shareholders - basic (in dollars per share/unit)	$ 0.19	$ 0.08	$ 0.36	$ 0.26
Net income attributable to COPT common shareholders - diluted (in dollars per share/unit)	0.19	0.08	0.36	0.26
Dividends declared per common share/unit (in dollars per share)	$ 0.275	$ 0.275	$ 0.55	$ 0.55

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Net income	$ 21,085	$ 18,859	$ 39,865	$ 41,599
Other comprehensive income
Unrealized gain (loss) on interest rate derivatives	1,912	(1,800)	6,588	(1,576)
(Gain) loss on interest rate derivatives recognized in interest expense	(47)	941	198	2,125
Equity in other comprehensive income of equity method investee	0	39	0	39
Other comprehensive income (loss)	1,865	(820)	6,786	588
Comprehensive income	22,950	18,039	46,651	42,187
Comprehensive income attributable to noncontrolling interests	(1,708)	(1,306)	(3,498)	(3,074)
Comprehensive income attributable to COPT	21,242	16,733	43,153	39,113
Corporate Office Properties, L.P.
Net income	21,085	18,859	39,865	41,599
Other comprehensive income
Unrealized gain (loss) on interest rate derivatives	1,912	(1,800)	6,588	(1,576)
(Gain) loss on interest rate derivatives recognized in interest expense	(47)	941	198	2,125
Equity in other comprehensive income of equity method investee	0	39	0	39
Other comprehensive income (loss)	1,865	(820)	6,786	588
Comprehensive income	22,950	18,039	46,651	42,187
Comprehensive income attributable to noncontrolling interests	(878)	(907)	(1,799)	(1,841)
Comprehensive income attributable to COPT	$ 22,072	$ 17,132	$ 44,852	$ 40,346

XML

Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock Issued to Public Under At-the-Market Program	Forward Equity Sale Agreement	Preferred Shares	Common Shares	Common Shares Common Stock Issued to Public Under At-the-Market Program	Common Shares Forward Equity Sale Agreement	Additional Paid-in Capital	Additional Paid-in Capital Common Stock Issued to Public Under At-the-Market Program	Additional Paid-in Capital Forward Equity Sale Agreement	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 Stock Issued to Public Under At-the-Market Program	Corporate Office Properties, L.P. Forward Equity Sale Agreement	Corporate Office Properties, L.P. Common Shares	Corporate Office Properties, L.P. Common Shares Common Stock Issued to Public Under At-the-Market Program	Corporate Office Properties, L.P. Common Shares Forward Equity Sale Agreement	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: 98,498,651 and 101,292,299 shares as of December 31, 2016 and 2017, respectively) at Dec. 31, 2016	$ 1,612,777			$ 172,500	$ 985			$ 2,116,581			$ (747,825)	$ (1,731)	$ 72,267	$ 1,612,777			$ 1,419,710			$ (1,854)	$ 13,621		$ 8,800		$ 172,500
Balance (preferred units) at Dec. 31, 2016																							352,000		6,900,000
Balance (in units/shares) at Dec. 31, 2016	98,498,651																102,089,042
Increase (Decrease) in Shareholders' Equity
Redemption of preferred units resulting from redemption of preferred shares (in units)																									(6,900,000)
Redemption of preferred shares (6,900,000 shares)	$ (172,500)			(172,500)				6,847			(6,847)			(172,500)											$ (172,500)
Conversion of common units to common shares (COPT: 187,000 and 53,817 shares for the six months ended June 30, 2017 and 2018, respectively)	$ 0				2			2,562					(2,564)
Common shares issued during the period		$ 19,668				$ 6			$ 19,662						$ 19,668			$ 19,668
Common shares issued during the period (in shares)																		591,042
Issuance of common units resulting from exercise of share options (in units)	5,000																5,000
Issuance of common units resulting from exercise of share options (COPT: 5,000 shares for the six months ended June 30, 2017)	$ 150				0			150						150			$ 150
Share-based compensation issuance, net of redemptions (in units/shares)	189,948																189,948
Share-based compensation issuance, net of redemptions (COPT: 189,948 and 137,379 shares issued, net of redemptions for the six months ended June 30, 2017 and 2018, respectively)	$ 3,047				2			3,045						3,047			$ 3,047
Redemption of vested equity awards	(1,813)							(1,813)						(1,813)			(1,813)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	0							(514)					514
Comprehensive income	41,047										38,545	568	1,934	41,047			33,209			588	701		$ 330		6,219
Dividends / Distributions to owners of common and preferred units	(60,922)										(60,922)			(63,124)			(56,575)						$ (330)		$ (6,219)
Distributions to owners of common and preferred units in COPLP	(2,202)												(2,202)
Distributions to noncontrolling interests in subsidiaries	(2,610)												(2,610)	(2,610)							(2,610)
Adjustment to arrive at fair value of redeemable noncontrolling interests	$ (401)							(401)						(401)			$ (401)
Balance (in units/shares) at Jun. 30, 2017	99,471,641																102,875,032
Balance (preferred units) at Jun. 30, 2017																							352,000		0
Balance (COPT: 99,471,641 shares and 103,260,495 shares as of June 30, 2017 and 2018, respectively) at Jun. 30, 2017	$ 1,436,241			0	995			2,146,119			(777,049)	(1,163)	67,339	1,436,241			$ 1,416,995			(1,266)	11,712		$ 8,800		$ 0
Increase (Decrease) in Shareholders' Equity
Cumulative effect of accounting change for adoption of hedge accounting guidance											(276)	276					(276)			276
Balance, as adjusted	1,468,307			0	1,013			2,201,047			(802,361)	2,443	66,165	1,468,307			1,444,746			2,449	12,312		8,800		0
Balance (COPT: 98,498,651 and 101,292,299 shares as of December 31, 2016 and 2017, respectively) at Dec. 31, 2017	$ 1,468,307			0	1,013			2,201,047			(802,085)	2,167	66,165	1,468,307			$ 1,445,022			2,173	12,312		$ 8,800		$ 0
Balance (preferred units) at Dec. 31, 2017																						352,000	352,000		0
Balance (in units/shares) at Dec. 31, 2017	101,292,299																104,543,177					3,250,878		101,292,299
Increase (Decrease) in Shareholders' Equity
Conversion of common units to common shares (COPT: 187,000 and 53,817 shares for the six months ended June 30, 2017 and 2018, respectively)	$ 0				1			760					(761)
Common shares issued during the period			$ 52,227				$ 18			$ 52,209						$ 52,227			$ 52,227
Common shares issued during the period (in shares)			1,777,000																1,777,000
Share-based compensation issuance, net of redemptions (in units/shares)	137,379																137,379
Share-based compensation issuance, net of redemptions (COPT: 189,948 and 137,379 shares issued, net of redemptions for the six months ended June 30, 2017 and 2018, respectively)	$ 3,400				1			3,399						3,400			$ 3,400
Redemption of vested equity awards	(1,525)							(1,525)						(1,525)			(1,525)
Adjustments to noncontrolling interests resulting from changes in ownership of COPLP	0							(702)					702
Comprehensive income	45,422										36,584	6,569	2,269	45,422			37,736			6,786	570		$ 330		$ 0
Dividends / Distributions to owners of common and preferred units	(56,493)										(56,493)			(58,581)			(58,251)						$ (330)		$ 0
Distributions to owners of common and preferred units in COPLP	(2,088)												(2,088)
Distributions to noncontrolling interests in subsidiaries	(7)												(7)	(7)							(7)
Adjustment to arrive at fair value of redeemable noncontrolling interests	$ (758)							(758)						(758)			$ (758)
Balance (in units/shares) at Jun. 30, 2018	103,260,495																106,457,556					3,197,061		103,260,495
Balance (preferred units) at Jun. 30, 2018																						352,000	352,000		0
Balance (COPT: 99,471,641 shares and 103,260,495 shares as of June 30, 2017 and 2018, respectively) at Jun. 30, 2018	$ 1,508,485			$ 0	$ 1,033			$ 2,254,430			$ (822,270)	$ 9,012	$ 66,280	$ 1,508,485			$ 1,477,575			$ 9,235	$ 12,875		$ 8,800		$ 0

XML

Consolidated Statements of Equity (Parenthetical) - shares	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Balance (in units/ shares)	103,260,495	99,471,641	101,292,299	98,498,651
Conversion of common units to common shares (in units/shares)	53,817	187,000
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)	137,379	189,948
Forward Equity Sale Agreement
Common shares issued during the period (in shares)	1,777,000
Common Shares | Common Stock Issued to Public Under At-the-Market Program
Common shares issued during the period (in shares)		591,042
Preferred Shares
Redemption of preferred shares (in shares/units)		6,900,000

XML

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities
Revenues from real estate operations received	$ 262,602	$ 254,392
Construction contract and other service revenues received	18,411	39,917
Property operating expenses paid	(83,642)	(79,683)
Construction contract and other service expenses paid	(62,624)	(31,996)
General, administrative, leasing, business development and land carry costs paid	(15,148)	(20,315)
Interest expense paid	(36,155)	(36,351)
Lease incentives paid	(4,825)	(9,375)
Other	2,093	940
Net cash provided by operating activities	80,712	117,529
Cash flows from investing activities
Construction, development and redevelopment	(67,749)	(85,926)
Tenant improvements on operating properties	(18,352)	(13,711)
Other capital improvements on operating properties	(8,584)	(11,780)
Proceeds from dispositions of properties	0	54,798
Leasing costs paid	(3,838)	(3,904)
Other	1,715	1,746
Net cash used in investing activities	(96,808)	(58,777)
Proceeds from debt
Revolving Credit Facility	153,000	213,000
Repayments of debt
Revolving Credit Facility	(109,000)	(19,000)
Scheduled principal amortization	(2,101)	(2,013)
Other debt repayments	0	(200,000)
Payments on capital lease obligation	(15,379)	0
Net proceeds from issuance of common shares/units	52,277	19,835
Redemption of preferred shares/units	0	(199,083)
Common share/unit dividends/distributions paid	(55,950)	(54,439)
Preferred share/unit dividends/distributions paid	0	(9,305)
Distributions paid to noncontrolling interests in COPLP	(2,110)	(2,274)
Redemption of vested equity awards	(1,525)	(1,813)
Other	(5,370)	(2,952)
Net cash provided by (used in) financing activities	13,842	(258,044)
Net decrease in cash and cash equivalents and restricted cash	(2,254)	(199,292)
Cash and cash equivalents and restricted cash
Beginning of period	14,831	212,619
End of period	12,577	13,327
Reconciliation of net income to net cash provided by operating activities:
Net income	39,865	41,599
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	67,684	66,948
Impairment losses	0	1,618
Amortization of deferred financing costs and net debt discounts	1,648	2,613
(Increase) decrease in deferred rent receivable	(3,470)	669
Gain on sales of real estate	27	(4,250)
Share-based compensation	3,132	2,820
Other	(777)	(1,861)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	8,050	(8,304)
Decrease in prepaid expenses and other assets, net	14,718	22,418
Decrease in accounts payable, accrued expenses and other liabilities	(49,422)	(2,387)
Decrease in rents received in advance and security deposits	(743)	(4,354)
Net cash provided by operating activities	80,712	117,529
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents and restricted cash	14,831	212,619
Supplemental schedule of non-cash investing and financing activities:
Increase (decrease) in accrued capital improvements, leasing and other investing activity costs	2,909	(4,927)
Increase in property in connection with capital lease obligation	0	16,127
Increase in fair value of derivatives applied to accumulated other comprehensive income and noncontrolling interests	6,719	513
Equity in other comprehensive income of an equity method investee	0	39
Decrease in noncontrolling interests and increase in shareholders’ equity in connection with the conversion of common units into common shares	761	2,564
Adjustments to noncontrolling interests resulting from changes in COPLP ownership	702	514
Increase in redeemable noncontrolling interests and decrease in equity to carry redeemable noncontrolling interests at fair value	758	401
Corporate Office Properties, L.P.
Cash flows from operating activities
Revenues from real estate operations received	262,602	254,392
Construction contract and other service revenues received	18,411	39,917
Property operating expenses paid	(83,642)	(79,683)
Construction contract and other service expenses paid	(62,624)	(31,996)
General, administrative, leasing, business development and land carry costs paid	(15,148)	(20,315)
Interest expense paid	(36,155)	(36,351)
Lease incentives paid	(4,825)	(9,375)
Other	2,093	940
Net cash provided by operating activities	80,712	117,529
Cash flows from investing activities
Construction, development and redevelopment	(67,749)	(85,926)
Tenant improvements on operating properties	(18,352)	(13,711)
Other capital improvements on operating properties	(8,584)	(11,780)
Proceeds from dispositions of properties	0	54,798
Leasing costs paid	(3,838)	(3,904)
Other	1,715	1,746
Net cash used in investing activities	(96,808)	(58,777)
Proceeds from debt
Revolving Credit Facility	153,000	213,000
Repayments of debt
Revolving Credit Facility	(109,000)	(19,000)
Scheduled principal amortization	(2,101)	(2,013)
Other debt repayments	0	(200,000)
Payments on capital lease obligation	(15,379)	0
Net proceeds from issuance of common shares/units	52,277	19,835
Redemption of preferred shares/units	0	(199,083)
Common share/unit dividends/distributions paid	(57,730)	(56,383)
Preferred share/unit dividends/distributions paid	(330)	(9,635)
Redemption of vested equity awards	(1,525)	(1,813)
Other	(5,370)	(2,952)
Net cash provided by (used in) financing activities	13,842	(258,044)
Net decrease in cash and cash equivalents and restricted cash	(2,254)	(199,292)
Cash and cash equivalents and restricted cash
Beginning of period	14,831	212,619
End of period	12,577	13,327
Reconciliation of net income to net cash provided by operating activities:
Net income	39,865	41,599
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	67,684	66,948
Impairment losses	0	1,618
Amortization of deferred financing costs and net debt discounts	1,648	2,613
(Increase) decrease in deferred rent receivable	(3,470)	669
Gain on sales of real estate	27	(4,250)
Share-based compensation	3,132	2,820
Other	(777)	(1,861)
Changes in operating assets and liabilities:
Decrease (increase) in accounts receivable	8,050	(8,304)
Decrease in prepaid expenses and other assets, net	14,296	21,126
Decrease in accounts payable, accrued expenses and other liabilities	(49,000)	(1,095)
Decrease in rents received in advance and security deposits	(743)	(4,354)
Net cash provided by operating activities	80,712	117,529
Reconciliation of cash and cash equivalents and restricted cash:
Cash and cash equivalents and restricted cash	14,831	212,619
Supplemental schedule of non-cash investing and financing activities:
Increase (decrease) in accrued capital improvements, leasing and other investing activity costs	2,909	(4,927)
Increase in property in connection with capital lease obligation	0	16,127
Increase in fair value of derivatives applied to accumulated other comprehensive income and noncontrolling interests	6,719	513
Equity in other comprehensive income of an equity method investee	0	39
Increase in redeemable noncontrolling interests and decrease in equity to carry redeemable noncontrolling interests at fair value	$ 758	$ 401

XML

Organization

6 Months Ended

Jun. 30, 2018

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 in the Greater Washington, DC/Baltimore region

with durable Class-A office fundamentals and characteristics (“Regional Office”). As of June 30, 2018, our properties included the following:

• 159 properties totaling 17.7 million square feet comprised of 143 office properties and 16 single-tenant data center shell properties (“data center shells”). We owned six of these data center shells through an unconsolidated real estate joint venture;

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

• nine properties under construction or redevelopment (five office properties and four data center shells) that we estimate will total approximately 1.0 million square feet upon completion, including one partially-operational property; and

• approximately 1,000 acres of land controlled for future development that we believe could be developed into approximately 12.3 million square feet and 150 acres of other land.

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 June 30, 2018, COPT owned 97.0% of the outstanding COPLP common units (“common units”); the remaining common units and all of the outstanding COPLP preferred units (“preferred units”) were owned by third parties. Common units not owned by COPT carry certain redemption rights. The number of common units owned by COPT is equivalent to the number of outstanding common shares of beneficial interest (“common shares”) of COPT, and the entitlement of all 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 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; similarly, although COPLP does not have a board of trustees, we refer to COPT’s Board of Trustees as COPLP’s Board of Trustees.

XML

Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2018

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, 2017 included in our 2017 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 2017 Annual Report on Form 10-K as updated for our adoption of recent accounting pronouncements discussed below.

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, including restricted cash and marketable securities that were reclassified to the line entitled “prepaid expenses and other assets, net” on our consolidated balance sheets after having been reported on a separate line in our Quarterly Reports on Form 10-Q filed in prior years and previous Annual Reports on Form 10-K.

Recent Accounting Pronouncements

We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) effective January 1, 2018 regarding the recognition of revenue from contracts with customers (“Topic 606”). Under this guidance, an entity recognizes 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 determined that Topic 606 is applicable to our construction contract and other service revenues, which includes predominantly construction and design projects performed primarily for tenants of our properties. We used the modified retrospective method for contracts that were not completed as of January 1, 2018. Under this method, the cumulative effect of initially applying the guidance is recognized as an adjustment to the opening balance of retained earnings as of the date of initial application. Our adoption of Topic 606 effective January 1, 2018 did not affect our consolidated financial statements other than additional disclosure provided in accordance with the guidance. We did not elect to use any of the practical expedients provided for under the guidance. 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, Topic 606 may 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).

We adopted guidance issued by the FASB effective January 1, 2018 that requires entities to measure equity investments at fair value through net income, except for those that result in consolidation or are accounted for under the equity method of accounting. For equity investments without readily determinable fair values, the guidance permits the application of a measurement alternative using the cost of the investment, less any impairments, plus or minus changes resulting from observable price changes for an identical or similar investment of the same issuer. Our adoption of this guidance had no effect on our consolidated financial statements.

We adopted guidance issued by the FASB retrospectively effective January 1, 2018 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. Our adoption of this guidance had no effect on our consolidated financial statements.

We adopted guidance issued by the FASB retrospectively effective January 1, 2018 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.  As a result of our adoption of this guidance, the change in restricted cash is no longer reported as either operating or investing activities on our statements of cash flows. Our restricted cash primarily consists of cash escrowed under mortgage debt for capital improvements and real estate taxes and certain tenant security deposits. Our adoption of this guidance had the following effects on our consolidated statements of cash flows for the six months ended June 30, 2017 (in thousands):

	As Previously Reported			Impact of Adoption			As Adjusted
Net cash provided by operating activities	$	117,737		$	(208	)	$	117,529
Net cash used in investing activities	$	(58,950	)	$	173		$	(58,777	)
Net decrease in cash and cash equivalents and restricted cash	$	(199,257	)	$	(35	)	$	(199,292	)
Beginning of period cash and cash equivalents and restricted cash	$	209,863		$	2,756		$	212,619
End of period cash and cash equivalents and restricted cash	$	10,606		$	2,721		$	13,327

We adopted guidance issued by the FASB that clarifies the scope of provisions and accounting for nonfinancial asset derecognition, including partial sales of real estate assets, effective January 1, 2018 using the full retrospective method. 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 nonfinancial 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 are now subject to the same derecognition model as all other nonfinancial assets. We had a transaction in July 2016 accounted for as a partial sale under the previous guidance that meets the criteria for immediate full gain recognition under the new guidance; as a result, we retrospectively recognized an additional $18 million in income in 2016 that was being amortized into income in subsequent periods under the previous guidance. The recognition pattern for our other sales of real estate were not changed by this new guidance. The full retrospective method requires adjustment of each reporting period presented at the time of adoption.

The tables below set forth the impact of the adoption of this guidance for amounts previously reported on the consolidated financial statements of COPT and subsidiaries (in thousands):

	As of December 31, 2017								As of June 30, 2017								As of December 31, 2016
Consolidated Balance Sheets	As Previously Reported			Impact of Adoption		As Adjusted			As Previously Reported			Impact of Adoption		As Adjusted			As Previously Reported			Impact of Adoption		As Adjusted
Investment in unconsolidated real estate joint venture	$	25,066		$	16,721	$	41,787		$	25,335		$	17,417	$	42,752		$	25,548		$	18,113	$	43,661
Cumulative distributions in excess of net income	$	(818,190	)	$	16,105	$	(802,085	)	$	(793,828	)	$	16,779	$	(777,049	)	$	(765,276	)	$	17,451	$	(747,825	)
Noncontrolling interests in subsidiaries	$	65,549		$	616	$	66,165		$	66,701		$	638	$	67,339		$	71,605		$	662	$	72,267

	For the Three Months Ended June 30, 2017									For the Six Months Ended June 30, 2017
Consolidated Statements of Operations and Comprehensive Income	As Previously Reported			Impact of Adoption			As Adjusted			As Previously Reported			Impact of Adoption			As Adjusted
Equity in income of unconsolidated entities	$	718		$	(348	)	$	370		$	1,443		$	(696	)	$	747
Income before gain on sales of real estate	$	19,195		$	(348	)	$	18,847		$	38,045		$	(696	)	$	37,349
Net income	$	19,207		$	(348	)	$	18,859		$	42,295		$	(696	)	$	41,599
Net income attributable to noncontrolling interests - Common units in COPLP	$	(273	)	$	12		$	(261	)	$	(907	)	$	24		$	(883	)
Net income attributable to COPT	$	17,862		$	(336	)	$	17,526		$	39,217		$	(672	)	$	38,545
Net income attributable to COPT common shareholders	$	7,976		$	(336	)	$	7,640		$	26,151		$	(672	)	$	25,479
Comprehensive income	$	18,387		$	(348	)	$	18,039		$	42,883		$	(696	)	$	42,187
Comprehensive income attributable to COPT	$	17,069		$	(336	)	$	16,733		$	39,785		$	(672	)	$	39,113

The tables below set forth the impact of the adoption of this guidance for amounts previously reported on the consolidated financial statements of COPLP and subsidiaries (in thousands):

	As of December 31, 2017						As of June 30, 2017						As of December 31, 2016
Consolidated Balance Sheets	As Previously Reported		Impact of Adoption		As Adjusted		As Previously Reported		Impact of Adoption		As Adjusted		As Previously Reported		Impact of Adoption		As Adjusted
Investment in unconsolid. real estate joint venture	$	25,066	$	16,721	$	41,787	$	25,335	$	17,417	$	42,752	$	25,548	$	18,113	$	43,661
Common units	$	1,428,301	$	16,721	$	1,445,022	$	1,399,578	$	17,417	$	1,416,995	$	1,401,597	$	18,113	$	1,419,710

	For the Three Months Ended June 30, 2017							For the Six Months Ended June 30, 2017
Consolidated Statements of Operations and Comprehensive Income	As Previously Reported		Impact of Adoption			As Adjusted		As Previously Reported		Impact of Adoption			As Adjusted
Equity in income of unconsolidated entities	$	718	$	(348	)	$	370	$	1,443	$	(696	)	$	747
Income before gain on sales of real estate	$	19,195	$	(348	)	$	18,847	$	38,045	$	(696	)	$	37,349
Net income	$	19,207	$	(348	)	$	18,859	$	42,295	$	(696	)	$	41,599
Net income attributable to COPLP	$	18,300	$	(348	)	$	17,952	$	40,454	$	(696	)	$	39,758
Net income attributable to COPLP common unitholders	$	8,249	$	(348	)	$	7,901	$	27,058	$	(696	)	$	26,362
Comprehensive income	$	18,387	$	(348	)	$	18,039	$	42,883	$	(696	)	$	42,187
Comprehensive income attributable to COPLP	$	17,480	$	(348	)	$	17,132	$	41,042	$	(696	)	$	40,346

Adoption of this guidance had no impact to cash provided by or used in operating, financing or investing activities on our consolidated statements of cash flows for the six months ended June 30, 2017.

We early adopted guidance issued by the FASB effective January 1, 2018 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. We adopted this guidance using the modified retrospective transition method under which we eliminated $276,000 in previously-recorded cumulative hedge ineffectiveness as of January 1, 2018 by means of a cumulative-effect adjustment to our beginning balance of accumulated other comprehensive income (“AOCI”), with a corresponding adjustment to the beginning balance of: cumulative distributions in excess of net income for COPT and subsidiaries; and common units for COPLP and subsidiaries.

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 2017 Annual Report on Form 10-K for amounts deferred in 2017, 2016 and 2015). 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: Under the issued and approved guidance, we believed that the new revenue standard would apply to executory costs and other components of revenue deemed to be non-lease components (such as common area maintenance and provision of utilities), in which case we would need: to separate the lease components of revenue due under leases from the non-lease components; and recognize revenue on the non-lease components as the related services are delivered, which could result in a change to our revenue recognition pattern. However, in March 2018, the FASB tentatively approved a practical expedient to provide lessors with an option to not separate lease components of revenue from non-lease components if: the timing and pattern of transfer of these components is the same as the related lease; and the lease would continue to be classified as an operating lease.

• Leases in which we are the lessee:

◦ Our most significant leases as lessee are ground leases; as of June 30, 2018, our future minimum rental payments under these leases totaled $89.4 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 right-of-use assets and lease liabilities 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, we expect to elect to apply the package of practical expedients under which we would 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.

XML

Revenue Recognition on Construction Contract and Other Service Revenues

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Revenue Recognition on Construction Contract and Other Service Revenues

Revenue Recognition on Construction Contract and Other Service Revenues

We enter into construction contracts to complete various design and construction services primarily for our United States Government tenants. The revenues and expenses from these services consist primarily of subcontracted costs that are reimbursed to us by our customers along with a fee. These services are an ancillary component of our overall operations, with small operating margins relative to the revenue. We review each contract to determine the performance obligations and allocate the transaction price. We recognize revenue under these contracts as services are performed in an amount that reflects the consideration we expect to receive in exchange for those services. Our performance obligations are satisfied over time as work progresses. Revenue recognition is determined using the input method based on costs incurred as of point in time relative to the total estimated costs at completion to measure progress toward satisfying our performance obligations. We believe incurred costs of work performed best depicts the transfer of control of the services being transferred to the customer.

In determining whether the performance obligations of each construction contract should be accounted for separately versus together, we consider numerous factors that may require significant judgment, including: whether the components contracted are substantially the same with the same pattern of transfer; whether the customer could contract with another party to perform construction based on our design project; and whether the customer can elect not to move forward after the design phase of the contract. Most of our contracts have a single performance obligation as the promise to transfer the services is not separately identifiable from other obligations in the contracts and, therefore, are not distinct. Some contracts have multiple performance obligations, most commonly due to having distinct project phases for design and construction for which our customer is making decisions and managing separately. In these cases, we allocate the transaction price between these performance obligations based on the amounts separately set forth in the contracts for such obligations. Contract modifications, such as change orders, are routine for our construction contracts and are generally determined to be additions to the existing performance obligations because they would have been part of the initial performance obligations if they were identified at the initial contract date.

We have three main types of compensation arrangements for our construction contracts: guaranteed maximum price (“GMP”); firm fixed price (“FFP”); and cost-plus fee.

• GMP contracts provide for revenue equal to costs incurred plus a fee equal to a percentage of such costs, up to a maximum contract amount. We generally enter into GMP contracts for projects that are significant in nature based on the size of the project and total fees, and for which the full scope of the project has not been determined as of the contract date. GMP contracts are lower risk to us than FFP contracts since the costs and revenue move proportionately to one another;

• FFP contracts provide for revenue equal to a fixed fee. These contracts are typically lower in value and scope relative to GMP contracts, and are generally entered into when the scope of the project is well defined. Typically, we assume more risk with FFP contracts than GMP contracts since the revenue is fixed and we could realize losses or less than expected profits if we incur more costs than originally estimated. However, these types of contracts offer the opportunity for additional profits when we complete the work for less than originally estimated. Determining the estimated total costs for contracts under an FFP compensation arrangement may require significant judgment and has a direct effect on our revenue recognition pattern;

• Cost-plus fee contracts provide for revenue equal to costs incurred plus a fee equal to a percentage of such costs but, unlike GMP contracts, do not have a maximum contract amount. We do not frequently enter into cost-plus fee contracts. Similar to GMP contracts, cost-plus fee contracts are low risk to us since the costs and revenue move proportionately to one another.

Construction contract cost estimates are based on various assumptions, such as performance of subcontractors and cost and availability of materials, to project the outcome of future events over the course of the project. We review and update these estimates regularly as a significant change could affect the profitability of our construction contracts. We recognize adjustments in estimated profit on contracts under the cumulative catch-up method as the modification does not create a new performance obligation. Under this method, the impact of the adjustment on profit recorded to date on a contract is recognized in the period the adjustment is identified. Revenue and profit in future periods are recognized using the adjusted estimate. If at any time the estimate of contract profitability indicates an anticipated loss on the contract, we recognize the total loss in the quarter it is identified.

We disaggregate our construction contract and other service revenues by compensation arrangement and by service type as we believe it best depicts the nature, timing and uncertainty of our revenue. The table below reports construction contract and other service revenues by compensation arrangement (in thousands):

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2018		2017		2018		2017
Construction contract revenues:
GMP	$	9,539	$	18,317	$	30,025	$	24,906
FFP	6,288		4,587		12,723		10,785
Cost-plus fee	1,496		—		1,554		17
Other	258		234		477		464
	$	17,581	$	23,138	$	44,779	$	36,172

The table below reports construction contract and other service revenues by service type (in thousands):

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2018		2017		2018		2017
Construction contract revenues:
Construction	$	16,668	$	21,078	$	42,583	$	31,169
Design	655		1,826		1,719		4,539
Other	258		234		477		464
	$	17,581	$	23,138	$	44,779	$	36,172

We recognized revenue from performance obligations satisfied (or partially satisfied) in previous periods of $10,000 and $401,000 in the three months endedJune 30, 2018 and 2017, respectively; and $319,000 and $547,000 in the six months endedJune 30, 2018 and 2017, respectively.

Our timing of revenue recognition for construction contracts generally differs from the timing of invoicing to customers. We recognize such revenue as we satisfy our performance obligations. Payment terms and conditions vary by contract type. Under most of our contracts, we bill customers monthly, as work progresses, in accordance with the contract terms, with payment due in 30 days, although customers occasionally pay in advance of services being provided. We have determined that our contracts generally do not include a significant financing component. The primary purpose of the timing of our invoicing is for convenience, not to receive financing from our customers or to provide customers with financing. Additionally, the timing of transfer of the services is often at the discretion of the customer. We recognized no impairment losses on construction contracts receivable or unbilled construction revenue in the periods set forth herein.

Accounts receivable related to our construction contract services is included in accounts receivable, net on our consolidated balance sheets. The beginning and ending balances of accounts receivable related to our construction contracts were as follows (in thousands):

	For the Six Months Ended June 30,
	2018		2017
Beginning balance	$	4,577	$	4,131
Ending balance	$	4,805	$	11,946

Under most of our contracts, we bill customers one month subsequent to revenue recognition, resulting in contract assets representing unbilled construction revenue. Contract assets, which we refer to herein as construction costs in excess of billings, are included in prepaid expenses and other assets, net reported on our consolidated balance sheets. The beginning and ending balances of our contract assets were as follows (in thousands):

	For the Six Months Ended June 30,
	2018		2017
Beginning balance	$	4,884	$	10,350
Ending balance	$	4,158	$	3,620

Our contract liabilities consist of advance payments from our customers or billings in excess of construction contract revenue recognized. Contract liabilities are included in other liabilities reported on our consolidated balance sheets. Changes in contract liabilities were as follows (in thousands):

	For the Six Months Ended June 30,
	2018		2017
Beginning balance	$	27,402	$	32,650
Ending balance	$	515	$	40,209
Portion of beginning balance recognized in revenue during:
Three months ended June 30	$	7,999	$	16,762
Six months ended June 30	$	27,296	$	20,961

The change in the contract liabilities balance reported above for the six months endedJune 30, 2018 was due primarily to our satisfaction of performance obligations during the period on a contract on which we previously received advance payments from a customer.

Revenue allocated to the remaining performance obligations under existing contracts as of June 30, 2018 that will be recognized as revenue in future periods was $16.1 million, virtually all of which we expect to recognize during the remainder of 2018.

We have no deferred incremental costs incurred to obtain or fulfill our construction contracts or other service revenues.

XML

Fair Value Measurements

6 Months Ended

Jun. 30, 2018

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 sheets using quoted market prices, as are other marketable securities that we hold. The balance of the plan, which was fully funded, totaled $4.2 million as of June 30, 2018, and is included in the line entitled “prepaid expenses and other assets, net” on COPT’s consolidated balance sheets. 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 are classified in Level 1 of the fair value hierarchy, while the offsetting liability 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 June 30, 2018, 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 7, 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 9, 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 7 for investing receivables, Note 9 for debt and Note 10 for interest rate derivatives. 

COPT and Subsidiaries

The table below sets forth financial assets and liabilities of COPT and subsidiaries that are accounted for at fair value on a recurring basis as of June 30, 2018 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	$	4,146	$	—	$	—	$	4,146
Other	48		—		—		48
Interest rate derivatives (1)	—		9,792		—		9,792
Total assets	$	4,194	$	9,792	$	—	$	13,986
Liabilities:
Deferred compensation plan liability (2)	$	—	$	4,194	$	—	$	4,194

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

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

COPLP and Subsidiaries

The table below sets forth financial assets and liabilities of COPLP and subsidiaries that are accounted for at fair value on a recurring basis as of June 30, 2018 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)	$	—	$	9,792	$	—	$	9,792

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

XML

Properties, Net

6 Months Ended

Jun. 30, 2018

Real Estate [Abstract]

Properties, Net

Properties, Net

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

	June 30, 2018			December 31, 2017
Land	$	469,494		$	455,680
Buildings and improvements	3,130,616			3,068,124
Less: Accumulated depreciation	(839,478		)	(786,193		)
Operating properties, net	$	2,760,632		$	2,737,611

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

	June 30, 2018		December 31, 2017
Land	$	232,758	$	240,825
Development in progress, excluding land	190,147		162,669
Projects in development or held for future development	$	422,905	$	403,494

Our property held for sale is 11751 Meadowville Lane, a property in our Data Center Shells sub-segment, the sale of which was not recognized for accounting purposes. We provided a financial guaranty to the buyer under which we provided an indemnification 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. We account for this transaction as a financing arrangement. Accordingly, we did not recognize the sale of this property for accounting purposes (and will not until the guaranty expires) and we reported the sales proceeds as a liability on the consolidated balance sheets as of June 30, 2018 and December 31, 2017 in the line entitled “deferred property sale.” We do not expect to incur any losses under this financial guaranty. The table below sets forth the components of this property’s assets as of June 30, 2018 and December 31, 2017 (in thousands):

Properties, net	$	38,670
Deferred rent receivable	3,237
Deferred leasing costs, net	319
Assets held for sale, net	$	42,226

2018 Construction Activities

During the six months endedJune 30, 2018, we placed into service 223,000 square feet in two newly-constructed properties and 13,000 square feet in one redeveloped property. As of June 30, 2018, we had seven properties under construction, or which we were contractually committed to construct, that we estimate will total 880,000 square feet upon completion and two properties under redevelopment (including one partially-operational property) that we estimate will total 128,000 square feet upon completion.

XML

Real Estate Joint Ventures

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 (dollars in thousands):

		Nominal
		Ownership		June 30, 2018 (1)
	Date	% as of		Total		Encumbered		Total
	Acquired	6/30/2018	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	159,805	$	74,012	$	51,157
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	73,395		44,457		46,323
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	75,813		—		4,887
				$	309,013	$	118,469	$	102,367

(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.

Unconsolidated Joint Venture

As of June 30, 2018, 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 shell properties in Virginia, that we account for using the equity method of accounting. As of June 30, 2018, we had an investment balance in GI-COPT of $40.8 million.

XML

Investing Receivables

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Investing Receivables

Investing Receivables

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

	June 30, 2018		December 31, 2017
Notes receivable from the City of Huntsville	$	51,386	$	54,472
Other investing loans receivable	3,041		3,021
	$	54,427	$	57,493

Our notes receivable from the City of Huntsville funded infrastructure costs in connection with our LW Redstone Company, LLC joint venture (see Note 6) and carry an interest rate of 9.95%.

We did not have an allowance for credit losses in connection with our investing receivables as of June 30, 2018 or December 31, 2017.  The fair value of these receivables approximated their carrying amounts as of June 30, 2018 and December 31, 2017.

XML

Prepaid Expenses and Other Assets, Net

6 Months Ended

Jun. 30, 2018

Prepaid Expense and Other Assets [Abstract]

Prepaid Expenses and Other Assets, Net

Prepaid Expenses and Other Assets, Net

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

	June 30, 2018		December 31, 2017
Lease incentives, net	$	18,376	$	19,011
Prepaid expenses	12,173		24,670
Interest rate derivatives	9,792		3,073
Furniture, fixtures and equipment, net	6,407		5,256
Non-real estate equity investments	5,076		5,056
Marketable securities in deferred compensation plan	4,194		4,616
Construction contract costs incurred in excess of billings	4,158		4,884
Restricted cash	4,105		2,570
Deferred tax asset, net (1)	1,774		1,892
Other assets	4,808		3,379
Prepaid expenses and other assets, net	$	70,863	$	74,407

(1) Includes a valuation allowance of $1.4 million.

XML

Debt, Net

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt, Net

Debt, Net

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

	Carrying Value (1) as of
	June 30, 2018		December 31, 2017		Stated Interest Rates as of	Scheduled Maturity as of
					June 30, 2018	June 30, 2018
Mortgage and Other Secured Debt:
Fixed rate mortgage debt (2)	$	148,950	$	150,723	3.82% - 7.87% (3)	2019-2026
Variable rate secured debt	12,943		13,115		LIBOR + 1.85% (4)	October 2020
Total mortgage and other secured debt	161,893		163,838
Revolving Credit Facility	170,000		126,000		LIBOR + 0.875% to 1.60% (5)	May 2019 (6)
Term Loan Facilities (7)	348,185		347,959		LIBOR + 0.90% to 1.85% (8)	2020-2022
Unsecured Senior Notes
3.600%, $350,000 aggregate principal	347,767		347,551		3.60% (9)	May 2023
5.250%, $250,000 aggregate principal	246,887		246,645		5.25% (10)	February 2024
3.700%, $300,000 aggregate principal	298,567		298,322		3.70% (11)	June 2021
5.000%, $300,000 aggregate principal	296,918		296,731		5.00% (12)	July 2025
Unsecured note payable	1,228		1,287		0% (13)	May 2026
Total debt, net	$	1,871,445	$	1,828,333

(1) The carrying values of our debt other than the Revolving Credit Facility reflect net deferred financing costs of $4.5 million as of June 30, 2018 and $5.0 million as of December 31, 2017.

(2)   Certain of the fixed rate mortgages carry interest rates that, upon assumption, were above or below market rates 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 $315,000 as of June 30, 2018 and $349,000 as of December 31, 2017.

(3) The weighted average interest rate on our fixed rate mortgage debt was 4.18% as of June 30, 2018.

(4)  The interest rate on our variable rate secured debt was 3.83% as of June 30, 2018.

(5) The weighted average interest rate on the Revolving Credit Facility was 3.19% as of June 30, 2018.

(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 June 30, 2018, 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.

(8)  The weighted average interest rate on these loans was 3.35% as of June 30, 2018.

(9) The carrying value of these notes reflects an unamortized discount totaling $1.5 millionas of June 30, 2018 and $1.7 million as of December 31, 2017.  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 $2.8 millionas of June 30, 2018 and $3.0 million as of December 31, 2017.  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 $1.1 millionas of June 30, 2018 and $1.3 million as of December 31, 2017.  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 $2.6 millionas of June 30, 2018 and $2.7 million as of December 31, 2017.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

(13)  This note carries an interest rate that, upon assumption, was below market rates and it therefore was recorded at its fair value based on applicable effective interest rates.  The carrying value of this note reflects an unamortized discount totaling $333,000 as of June 30, 2018 and $373,000 as of December 31, 2017.

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 June 30, 2018, we were within the compliance requirements of these financial covenants.

We capitalized interest costs of $1.4 million in the three months ended June 30, 2018, $1.6 million in the three months ended June 30, 2017, $2.8 million in the six months endedJune 30, 2018 and $3.1 million in the six months endedJune 30, 2017.

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

	June 30, 2018				December 31, 2017
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Fixed-rate debt
Unsecured Senior Notes	$	1,190,139	$	1,220,040	$	1,189,249	$	1,229,398
Other fixed-rate debt	150,178		148,257		152,010		152,485
Variable-rate debt	531,128		530,968		487,074		485,694
	$	1,871,445	$	1,899,265	$	1,828,333	$	1,867,577

XML

Interest Rate Derivatives

6 Months Ended

Jun. 30, 2018

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	June 30, 2018		December 31, 2017
$	100,000		1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	$	745	$	252
13,026		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	343		213
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	3,481		1,046
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	3,494		1,051
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	1,729		511
							$	9,792	$	3,073

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

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	June 30, 2018		December 31, 2017
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets, net	$	9,792	$	3,073

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

	Amount of Gain (Loss) Recognized in AOCI on Derivatives										Amount of Gain (Loss) Reclassified from AOCI into Interest Expense on Statement of Operations
	For the Three Months Ended June 30,					For the Six Months Ended June 30,					For the Three Months Ended June 30,					For the Six Months Ended June 30,
Derivatives in Hedging Relationships	2018		2017			2018		2017			2018		2017			2018			2017
Interest rate derivatives	$	1,912	$	(1,800	)	$	6,588	$	(1,576	)	$	47	$	(941	)	$	(198	)	$	(2,125	)

Over the next 12 months, we estimate that approximately $1.9 million of gains will be reclassified from AOCI as a decrease 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. We are not in default with any of these provisions. As of June 30, 2018, we did not have any derivatives in liability positions. As of June 30, 2018, we had not posted any collateral related to these agreements.

XML

Redeemable Noncontrolling Interests

6 Months Ended

Jun. 30, 2018

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 6), 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 sheets. 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, occupancy projections and estimated operating and development expenditures. The table below sets forth the activity for these redeemable noncontrolling interests (in thousands):

	For the Six Months Ended June 30,
	2018			2017
Beginning balance	$	23,125		$	22,979
Contributions from noncontrolling interests	143			—
Distributions to noncontrolling interests	(711		)	(789		)
Net income attributable to noncontrolling interests	1,229			1,140
Adjustment to arrive at fair value of interests	758			401
Ending balance	$	24,544		$	23,731

XML

Equity

6 Months Ended

Jun. 30, 2018

Equity [Abstract]

Equity

Equity

During the six months endedJune 30, 2018, COPT issued 1.8 million common shares under its forward equity sale agreements for net proceeds of $52.3 million. COPT contributed the net proceeds from these issuances to COPLP in exchange for an equal number of units in COPLP. COPT’s remaining capacity under the forward equity sale agreements was 5.7 million common shares as of June 30, 2018.

During the six months endedJune 30, 2018, certain COPLP limited partners converted 53,817 common units in COPLP for an equal number of common shares in COPT.

As of June 30, 2018, COPT had remaining capacity under its at-the-market stock offering program equal to an aggregate gross sales price of $70.0 million in common share sales.

See Note 14 for disclosure of COPT common share and COPLP common unit activity pertaining to our share-based compensation plans.

XML

Information by Business Segment

6 Months Ended

Jun. 30, 2018

Segment Reporting [Abstract]

Information by Business Segment

Information by Business Segment

We have the following reportable segments: Defense/IT Locations; Regional Office; 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). As of June 30, 2018 and December 31, 2017, our Regional Office segment included properties located in select urban/urban-like submarkets in the Greater Washington, DC/Baltimore region with durable Class-A office fundamentals and characteristics; during 2017, this segment also included suburban properties that did not meet these characteristics (that were since disposed).

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 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			Wholesale Data Center			Other			Total
Three Months Ended June 30, 2018
Revenues from real estate operations	$	61,993		$	13,118		$	12,382		$	8,127		$	3,652		$	5,955		$	105,227		$	15,296		$	8,105		$	534		$	129,162
Property operating expenses	(20,099		)	(4,909		)	(7,494		)	(3,431		)	(1,509		)	(799		)	(38,241		)	(7,169		)	(4,150		)	114			(49,446		)
UJV NOI allocable to COPT	—			—			—			—			—			1,202			1,202			—			—			—			1,202
NOI from real estate operations	$	41,894		$	8,209		$	4,888		$	4,696		$	2,143		$	6,358		$	68,188		$	8,127		$	3,955		$	648		$	80,918
Additions to long-lived assets	$	8,151		$	1,186		$	—		$	1,450		$	351		$	—		$	11,138		$	5,361		$	81		$	188		$	16,768
Transfers from non-operating properties	$	3,035		$	352		$	—		$	3		$	26		$	29,675		$	33,091		$	—		$	1,133		$	—		$	34,224
Three Months Ended June 30, 2017
Revenues from real estate operations	$	61,284		$	11,095		$	13,029		$	7,449		$	3,624		$	5,800		$	102,281		$	17,462		$	7,033		$	1,521		$	128,297
Property operating expenses	(20,129		)	(4,219		)	(8,130		)	(3,025		)	(1,491		)	(577		)	(37,571		)	(7,082		)	(3,501		)	(474		)	(48,628		)
UJV NOI allocable to COPT	—			—			—			—			—			1,198			1,198			—			—			—			1,198
NOI from real estate operations	$	41,155		$	6,876		$	4,899		$	4,424		$	2,133		$	6,421		$	65,908		$	10,380		$	3,532		$	1,047		$	80,867
Additions to long-lived assets	$	5,853		$	977		$	16		$	2,231		$	84		$	—		$	9,161		$	4,018		$	2,005		$	(29	)	$	15,155
Transfers from non-operating properties	$	18,159		$	218		$	—		$	466		$	1,709		$	26,215		$	46,767		$	(25	)	$	—		$	—		$	46,742
Six Months Ended June 30, 2018
Revenues from real estate operations	$	124,775		$	25,679		$	23,825		$	15,997		$	7,285		$	11,786		$	209,347		$	30,580		$	16,182		$	1,331		$	257,440
Property operating expenses	(41,703		)	(9,632		)	(14,092		)	(6,735		)	(2,949		)	(1,593		)	(76,704		)	(15,047		)	(8,408		)	(238		)	(100,397		)
UJV NOI allocable to COPT	—			—			—			—			—			2,401			2,401			—			—			—			2,401
NOI from real estate operations	$	83,072		$	16,047		$	9,733		$	9,262		$	4,336		$	12,594		$	135,044		$	15,533		$	7,774		$	1,093		$	159,444
Additions to long-lived assets	$	15,272		$	3,126		$	—		$	2,558		$	430		$	—		$	21,386		$	9,245		$	117		$	315		$	31,063
Transfers from non-operating properties	$	20,221		$	693		$	—		$	—		$	470		$	30,789		$	52,173		$	—		$	2,145		$	—		$	54,318
Segment assets at June 30, 2018	$	1,269,525		$	396,139		$	126,956		$	190,537		$	106,374		$	330,622		$	2,420,153		$	396,847		$	221,239		$	4,213		$	3,042,452
Six Months Ended June 30, 2017
Revenues from real estate operations	$	122,139		$	22,802		$	24,663		$	14,459		$	7,084		$	11,322		$	202,469		$	35,738		$	13,803		$	3,054		$	255,064
Property operating expenses	(40,649		)	(8,671		)	(14,932		)	(6,234		)	(2,862		)	(1,236		)	(74,584		)	(14,568		)	(6,866		)	(1,129		)	(97,147		)
UJV NOI allocable to COPT	—			—			—			—			—			2,400			2,400			—			—			—			2,400
NOI from real estate operations	$	81,490		$	14,131		$	9,731		$	8,225		$	4,222		$	12,486		$	130,285		$	21,170		$	6,937		$	1,925		$	160,317
Additions to long-lived assets	$	9,275		$	3,445		$	16		$	4,399		$	216		$	—		$	17,351		$	11,138		$	3,579		$	127		$	32,195
Transfers from non-operating properties	$	31,575		$	440		$	—		$	466		$	1,705		$	25,200		$	59,386		$	(25	)	$	8		$	18		$	59,387
Segment assets at June 30, 2017	$	1,267,635		$	357,747		$	130,431		$	195,732		$	109,586		$	247,974		$	2,309,105		$	435,399		$	229,224		$	19,350		$	2,993,078

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 June 30,				For the Six Months Ended June 30,
	2018		2017		2018		2017
Segment revenues from real estate operations	$	129,162	$	128,297	$	257,440	$	255,064
Construction contract and other service revenues	17,581		23,138		44,779		36,172
Total revenues	$	146,743	$	151,435	$	302,219	$	291,236

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
UJV NOI allocable to COPT	$	1,202		$	1,198		$	2,401		$	2,400
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(828		)	(827		)	(1,652		)	(1,651		)
Add: Equity in loss of unconsolidated non-real estate entities	(1		)	(1		)	(3		)	(2		)
Equity in income of unconsolidated entities	$	373		$	370		$	746		$	747

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Construction contract and other service revenues	$	17,581		$	23,138		$	44,779		$	36,172
Construction contract and other service expenses	(16,941		)	(22,315		)	(43,157		)	(34,801		)
NOI from service operations	$	640		$	823		$	1,622		$	1,371

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

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
NOI from real estate operations	$	80,918		$	80,867		$	159,444		$	160,317
NOI from service operations	640			823			1,622			1,371
Interest and other income	1,439			1,583			2,798			3,309
Equity in income of unconsolidated entities	373			370			746			747
Income tax expense	(63		)	(48		)	(118		)	(88		)
Depreciation and other amortization associated with real estate operations	(33,190		)	(32,793		)	(66,702		)	(65,852		)
Impairment losses	—			(1,625		)	—			(1,625		)
General, administrative and leasing expenses	(7,628		)	(7,859		)	(14,920		)	(16,470		)
Business development expenses and land carry costs	(1,234		)	(1,597		)	(2,848		)	(3,290		)
Interest expense	(18,945		)	(19,163		)	(37,729		)	(38,157		)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,202		)	(1,198		)	(2,401		)	(2,400		)
Loss on early extinguishment of debt	—			(513		)	—			(513		)
Income before gain on sales of real estate	$	21,108		$	18,847		$	39,892		$	37,349

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

	June 30, 2018		June 30, 2017
Segment assets	$	3,042,452	$	2,993,078
Non-operating property assets	431,661		452,824
Other assets	138,249		146,402
Total COPT consolidated assets	$	3,612,362	$	3,592,304

The accounting policies of the segments are the same as those used to prepare our consolidated financial statements, except that 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 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.

XML

Share-Based Compensation

6 Months Ended

Jun. 30, 2018

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

Share-Based Compensation

Share-Based Compensation

Performance Share Awards (“PSUs”)

On January 1, 2018, our Board of Trustees granted 59,110 PSUs with an aggregate grant date fair value of $1.9 million to our three executives.  The PSUs have a performance period beginning on January 1, 2018 and concluding on the earlier of December 31, 2020 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	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 number of earned PSUs in settlement of the award plan; and

• pay cash equal to 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.

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

We computed a grant date fair value of $31.97 per PSU using a Monte Carlo model. Significant assumptions for that model included the following: baseline common share value of $29.20; expected volatility for COPT common shares of 17.0%; and a risk-free interest rate of 2.04%.  

We issued 13,328 common shares on February 22, 2018 to executives in settlement of PSUs issued in 2015, representing 75% of the target award for those PSUs.

Restricted Shares

During the six months endedJune 30, 2018, certain employees and non-employee members of our Board of Trustees were granted a total of 196,366 restricted common shares with an aggregate grant date fair value of $5.0 million (weighted average of $25.38 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 employee remains 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 six months endedJune 30, 2018, forfeiture restrictions lapsed on 161,322 previously issued common shares; these shares had a weighted average grant date fair value of $29.72 per share, and the aggregate intrinsic value of the shares on the vesting dates was $4.1 million.

Deferred Share Awards

During the six months endedJune 30, 2018, non-employee members of our Board of Trustees were granted a total of 13,832 deferred share awards with an aggregate grant date fair value of $388,000 ($28.08 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 six months endedJune 30, 2018, we issued 5,515 common shares in settlement of deferred share awards; these shares had a grant date fair value of $29.32 per share, and the aggregate intrinsic value of the shares on the settlement date was $154,000.

XML

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

6 Months Ended

Jun. 30, 2018

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 COPT’s forward equity sale agreements and our 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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Numerator:
Net income attributable to COPT	$	19,434		$	17,526		$	36,584		$	38,545
Preferred share dividends	—			(3,039		)	—			(6,219		)
Issuance costs associated with redeemed preferred shares	—			(6,847		)	—			(6,847		)
Income attributable to share-based compensation awards	(117		)	(117		)	(234		)	(242		)
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders	$	19,317		$	7,523		$	36,350		$	25,237
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	101,789			99,036			101,397			98,725
Dilutive effect of share-based compensation awards	119			160			131			158
Denominator for diluted EPS (common shares)	101,908			99,196			101,528			98,883
Basic EPS	$	0.19		$	0.08		$	0.36		$	0.26
Diluted EPS	$	0.19		$	0.08		$	0.36		$	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 June 30,		For the Six Months Ended June 30,
	2018	2017	2018	2017
Conversion of common units	3,197	3,405	3,208	3,425
Conversion of Series I preferred units	176	176	176	176

The following securities were also excluded from the computation of diluted EPS because their effects were not dilutive:

• weighted average shares related to COPT’s forward equity sale agreements for the three and six months ended June 30, 2018 of 6.8 million and 7.1 million, respectively;

• weighted average restricted shares and deferred share awards for the three months ended June 30, 2018 and 2017 of 458,000 and 455,000, respectively, and for the six months endedJune 30, 2018 and 2017 of 451,000 and 424,000, respectively; and

• weighted average options for the three months ended June 30, 2018 and 2017 of 47,000 and 61,000, respectively, and for the six months endedJune 30, 2018 and 2017 of 53,000 and 100,000, 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 COPT’s forward equity sale agreements and our 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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Numerator:
Net income attributable to COPLP	$	20,207		$	17,952		$	38,066		$	39,758
Preferred unit distributions	(165		)	(3,204		)	(330		)	(6,549		)
Issuance costs associated with redeemed preferred units	—			(6,847		)	—			(6,847		)
Income attributable to share-based compensation awards	(117		)	(117		)	(234		)	(242		)
Numerator for basic and diluted EPU on net income attributable to COPLP common unitholders	$	19,925		$	7,784		$	37,502		$	26,120
Denominator (all weighted averages):
Denominator for basic EPU (common units)	104,986			102,441			104,605			102,150
Dilutive effect of share-based compensation awards	119			160			131			158
Denominator for diluted EPU (common units)	105,105			102,601			104,736			102,308
Basic EPU	$	0.19		$	0.08		$	0.36		$	0.26
Diluted EPU	$	0.19		$	0.08		$	0.36		$	0.26

Our diluted EPU computations do not include the effect of 176,000 common units resulting from an assumed conversion of the Series I preferred units since such a conversion would increase diluted EPU for the three and six months ended June 30, 2018 and 2017. The following securities were also excluded from the computation of diluted EPU because their effects were not dilutive:

• weighted average units related to COPT’s forward equity sale agreements for the three and six months ended June 30, 2018 of 6.8 million and 7.1 million, respectively;

• weighted average restricted units and deferred share awards for the three months ended June 30, 2018 and 2017 of 458,000 and 455,000, respectively, and for the six months endedJune 30, 2018 and 2017 of 451,000 and 424,000, respectively; and

• weighted average options for the three months ended June 30, 2018 and 2017 of 47,000 and 61,000, respectively, and for the six months endedJune 30, 2018 and 2017 of 53,000 and 100,000, respectively.

XML

Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Litigation and Claims

In the normal course of business, we are subject to legal actions and other claims.  We record losses for specific legal proceedings and claims when we determine that a loss is probable and the amount of loss can be reasonably estimated.  Management believes that it is reasonably possible that we could incur losses pursuant to such claims but do not believe such losses would materially affect our financial position, liquidity or results of operations. 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.

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.

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. While we are obligated to fund, through a special tax, any future shortfalls between debt service of the bonds and real estate taxes available to repay the bonds, as of June 30, 2018, we do not expect any such future fundings will be required.

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 June 30, 2018 follow (in thousands):

Year Ending December 31,
2018 (1)	$	644
2019	1,277
2020	1,270
2021	1,274
2022	1,158
Thereafter	84,611
	$	90,234

(1) Represents the six months ending December 31, 2018.

Capital Lease

On May 25, 2017, we entered into a ground lease on land under development in Washington, DC through 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 in 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 and have since paid down most of this liability. The remaining capital lease obligation as of June 30, 2018 was comprised of the following (in thousands):

Minimum rental payments due in 2020	$	660
Less: Amount representing interest	(20		)
Capital lease obligation	$	640

Contractual Obligations

We had amounts remaining to be incurred under various contractual obligations as of June 30, 2018 that included the following (excluding amounts incurred and therefore reflected as liabilities reported on our consolidated balance sheets):

• new development and redevelopment obligations of $89.4 million;

• capital expenditures for operating properties of $41.5 million;

• third party construction of $4.5 million; and

• other obligations of $2.4 million.

XML

Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2018

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, 2017 included in our 2017 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 2017 Annual Report on Form 10-K as updated for our adoption of recent accounting pronouncements discussed below.

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, including restricted cash and marketable securities that were reclassified to the line entitled “prepaid expenses and other assets, net” on our consolidated balance sheets after having been reported on a separate line in our Quarterly Reports on Form 10-Q filed in prior years and previous Annual Reports on Form 10-K.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

We adopted guidance issued by the Financial Accounting Standards Board (“FASB”) effective January 1, 2018 regarding the recognition of revenue from contracts with customers (“Topic 606”). Under this guidance, an entity recognizes 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 determined that Topic 606 is applicable to our construction contract and other service revenues, which includes predominantly construction and design projects performed primarily for tenants of our properties. We used the modified retrospective method for contracts that were not completed as of January 1, 2018. Under this method, the cumulative effect of initially applying the guidance is recognized as an adjustment to the opening balance of retained earnings as of the date of initial application. Our adoption of Topic 606 effective January 1, 2018 did not affect our consolidated financial statements other than additional disclosure provided in accordance with the guidance. We did not elect to use any of the practical expedients provided for under the guidance. 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, Topic 606 may 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).

We adopted guidance issued by the FASB effective January 1, 2018 that requires entities to measure equity investments at fair value through net income, except for those that result in consolidation or are accounted for under the equity method of accounting. For equity investments without readily determinable fair values, the guidance permits the application of a measurement alternative using the cost of the investment, less any impairments, plus or minus changes resulting from observable price changes for an identical or similar investment of the same issuer. Our adoption of this guidance had no effect on our consolidated financial statements.

We adopted guidance issued by the FASB retrospectively effective January 1, 2018 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. Our adoption of this guidance had no effect on our consolidated financial statements.

We adopted guidance issued by the FASB retrospectively effective January 1, 2018 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.  As a result of our adoption of this guidance, the change in restricted cash is no longer reported as either operating or investing activities on our statements of cash flows. Our restricted cash primarily consists of cash escrowed under mortgage debt for capital improvements and real estate taxes and certain tenant security deposits. Our adoption of this guidance had the following effects on our consolidated statements of cash flows for the six months ended June 30, 2017 (in thousands):

	As Previously Reported			Impact of Adoption			As Adjusted
Net cash provided by operating activities	$	117,737		$	(208	)	$	117,529
Net cash used in investing activities	$	(58,950	)	$	173		$	(58,777	)
Net decrease in cash and cash equivalents and restricted cash	$	(199,257	)	$	(35	)	$	(199,292	)
Beginning of period cash and cash equivalents and restricted cash	$	209,863		$	2,756		$	212,619
End of period cash and cash equivalents and restricted cash	$	10,606		$	2,721		$	13,327

We adopted guidance issued by the FASB that clarifies the scope of provisions and accounting for nonfinancial asset derecognition, including partial sales of real estate assets, effective January 1, 2018 using the full retrospective method. 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 nonfinancial 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 are now subject to the same derecognition model as all other nonfinancial assets. We had a transaction in July 2016 accounted for as a partial sale under the previous guidance that meets the criteria for immediate full gain recognition under the new guidance; as a result, we retrospectively recognized an additional $18 million in income in 2016 that was being amortized into income in subsequent periods under the previous guidance. The recognition pattern for our other sales of real estate were not changed by this new guidance. The full retrospective method requires adjustment of each reporting period presented at the time of adoption.

The tables below set forth the impact of the adoption of this guidance for amounts previously reported on the consolidated financial statements of COPT and subsidiaries (in thousands):

	As of December 31, 2017								As of June 30, 2017								As of December 31, 2016
Consolidated Balance Sheets	As Previously Reported			Impact of Adoption		As Adjusted			As Previously Reported			Impact of Adoption		As Adjusted			As Previously Reported			Impact of Adoption		As Adjusted
Investment in unconsolidated real estate joint venture	$	25,066		$	16,721	$	41,787		$	25,335		$	17,417	$	42,752		$	25,548		$	18,113	$	43,661
Cumulative distributions in excess of net income	$	(818,190	)	$	16,105	$	(802,085	)	$	(793,828	)	$	16,779	$	(777,049	)	$	(765,276	)	$	17,451	$	(747,825	)
Noncontrolling interests in subsidiaries	$	65,549		$	616	$	66,165		$	66,701		$	638	$	67,339		$	71,605		$	662	$	72,267

	For the Three Months Ended June 30, 2017									For the Six Months Ended June 30, 2017
Consolidated Statements of Operations and Comprehensive Income	As Previously Reported			Impact of Adoption			As Adjusted			As Previously Reported			Impact of Adoption			As Adjusted
Equity in income of unconsolidated entities	$	718		$	(348	)	$	370		$	1,443		$	(696	)	$	747
Income before gain on sales of real estate	$	19,195		$	(348	)	$	18,847		$	38,045		$	(696	)	$	37,349
Net income	$	19,207		$	(348	)	$	18,859		$	42,295		$	(696	)	$	41,599
Net income attributable to noncontrolling interests - Common units in COPLP	$	(273	)	$	12		$	(261	)	$	(907	)	$	24		$	(883	)
Net income attributable to COPT	$	17,862		$	(336	)	$	17,526		$	39,217		$	(672	)	$	38,545
Net income attributable to COPT common shareholders	$	7,976		$	(336	)	$	7,640		$	26,151		$	(672	)	$	25,479
Comprehensive income	$	18,387		$	(348	)	$	18,039		$	42,883		$	(696	)	$	42,187
Comprehensive income attributable to COPT	$	17,069		$	(336	)	$	16,733		$	39,785		$	(672	)	$	39,113

The tables below set forth the impact of the adoption of this guidance for amounts previously reported on the consolidated financial statements of COPLP and subsidiaries (in thousands):

	As of December 31, 2017						As of June 30, 2017						As of December 31, 2016
Consolidated Balance Sheets	As Previously Reported		Impact of Adoption		As Adjusted		As Previously Reported		Impact of Adoption		As Adjusted		As Previously Reported		Impact of Adoption		As Adjusted
Investment in unconsolid. real estate joint venture	$	25,066	$	16,721	$	41,787	$	25,335	$	17,417	$	42,752	$	25,548	$	18,113	$	43,661
Common units	$	1,428,301	$	16,721	$	1,445,022	$	1,399,578	$	17,417	$	1,416,995	$	1,401,597	$	18,113	$	1,419,710

	For the Three Months Ended June 30, 2017							For the Six Months Ended June 30, 2017
Consolidated Statements of Operations and Comprehensive Income	As Previously Reported		Impact of Adoption			As Adjusted		As Previously Reported		Impact of Adoption			As Adjusted
Equity in income of unconsolidated entities	$	718	$	(348	)	$	370	$	1,443	$	(696	)	$	747
Income before gain on sales of real estate	$	19,195	$	(348	)	$	18,847	$	38,045	$	(696	)	$	37,349
Net income	$	19,207	$	(348	)	$	18,859	$	42,295	$	(696	)	$	41,599
Net income attributable to COPLP	$	18,300	$	(348	)	$	17,952	$	40,454	$	(696	)	$	39,758
Net income attributable to COPLP common unitholders	$	8,249	$	(348	)	$	7,901	$	27,058	$	(696	)	$	26,362
Comprehensive income	$	18,387	$	(348	)	$	18,039	$	42,883	$	(696	)	$	42,187
Comprehensive income attributable to COPLP	$	17,480	$	(348	)	$	17,132	$	41,042	$	(696	)	$	40,346

Adoption of this guidance had no impact to cash provided by or used in operating, financing or investing activities on our consolidated statements of cash flows for the six months ended June 30, 2017.

We early adopted guidance issued by the FASB effective January 1, 2018 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. We adopted this guidance using the modified retrospective transition method under which we eliminated $276,000 in previously-recorded cumulative hedge ineffectiveness as of January 1, 2018 by means of a cumulative-effect adjustment to our beginning balance of accumulated other comprehensive income (“AOCI”), with a corresponding adjustment to the beginning balance of: cumulative distributions in excess of net income for COPT and subsidiaries; and common units for COPLP and subsidiaries.

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 2017 Annual Report on Form 10-K for amounts deferred in 2017, 2016 and 2015). 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: Under the issued and approved guidance, we believed that the new revenue standard would apply to executory costs and other components of revenue deemed to be non-lease components (such as common area maintenance and provision of utilities), in which case we would need: to separate the lease components of revenue due under leases from the non-lease components; and recognize revenue on the non-lease components as the related services are delivered, which could result in a change to our revenue recognition pattern. However, in March 2018, the FASB tentatively approved a practical expedient to provide lessors with an option to not separate lease components of revenue from non-lease components if: the timing and pattern of transfer of these components is the same as the related lease; and the lease would continue to be classified as an operating lease.

• Leases in which we are the lessee:

◦ Our most significant leases as lessee are ground leases; as of June 30, 2018, our future minimum rental payments under these leases totaled $89.4 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 right-of-use assets and lease liabilities 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, we expect to elect to apply the package of practical expedients under which we would 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.

XML

Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

Our adoption of this guidance had the following effects on our consolidated statements of cash flows for the six months ended June 30, 2017 (in thousands):

	As Previously Reported			Impact of Adoption			As Adjusted
Net cash provided by operating activities	$	117,737		$	(208	)	$	117,529
Net cash used in investing activities	$	(58,950	)	$	173		$	(58,777	)
Net decrease in cash and cash equivalents and restricted cash	$	(199,257	)	$	(35	)	$	(199,292	)
Beginning of period cash and cash equivalents and restricted cash	$	209,863		$	2,756		$	212,619
End of period cash and cash equivalents and restricted cash	$	10,606		$	2,721		$	13,327

The tables below set forth the impact of the adoption of this guidance for amounts previously reported on the consolidated financial statements of COPT and subsidiaries (in thousands):

	As of December 31, 2017								As of June 30, 2017								As of December 31, 2016
Consolidated Balance Sheets	As Previously Reported			Impact of Adoption		As Adjusted			As Previously Reported			Impact of Adoption		As Adjusted			As Previously Reported			Impact of Adoption		As Adjusted
Investment in unconsolidated real estate joint venture	$	25,066		$	16,721	$	41,787		$	25,335		$	17,417	$	42,752		$	25,548		$	18,113	$	43,661
Cumulative distributions in excess of net income	$	(818,190	)	$	16,105	$	(802,085	)	$	(793,828	)	$	16,779	$	(777,049	)	$	(765,276	)	$	17,451	$	(747,825	)
Noncontrolling interests in subsidiaries	$	65,549		$	616	$	66,165		$	66,701		$	638	$	67,339		$	71,605		$	662	$	72,267

	For the Three Months Ended June 30, 2017									For the Six Months Ended June 30, 2017
Consolidated Statements of Operations and Comprehensive Income	As Previously Reported			Impact of Adoption			As Adjusted			As Previously Reported			Impact of Adoption			As Adjusted
Equity in income of unconsolidated entities	$	718		$	(348	)	$	370		$	1,443		$	(696	)	$	747
Income before gain on sales of real estate	$	19,195		$	(348	)	$	18,847		$	38,045		$	(696	)	$	37,349
Net income	$	19,207		$	(348	)	$	18,859		$	42,295		$	(696	)	$	41,599
Net income attributable to noncontrolling interests - Common units in COPLP	$	(273	)	$	12		$	(261	)	$	(907	)	$	24		$	(883	)
Net income attributable to COPT	$	17,862		$	(336	)	$	17,526		$	39,217		$	(672	)	$	38,545
Net income attributable to COPT common shareholders	$	7,976		$	(336	)	$	7,640		$	26,151		$	(672	)	$	25,479
Comprehensive income	$	18,387		$	(348	)	$	18,039		$	42,883		$	(696	)	$	42,187
Comprehensive income attributable to COPT	$	17,069		$	(336	)	$	16,733		$	39,785		$	(672	)	$	39,113

The tables below set forth the impact of the adoption of this guidance for amounts previously reported on the consolidated financial statements of COPLP and subsidiaries (in thousands):

	As of December 31, 2017						As of June 30, 2017						As of December 31, 2016
Consolidated Balance Sheets	As Previously Reported		Impact of Adoption		As Adjusted		As Previously Reported		Impact of Adoption		As Adjusted		As Previously Reported		Impact of Adoption		As Adjusted
Investment in unconsolid. real estate joint venture	$	25,066	$	16,721	$	41,787	$	25,335	$	17,417	$	42,752	$	25,548	$	18,113	$	43,661
Common units	$	1,428,301	$	16,721	$	1,445,022	$	1,399,578	$	17,417	$	1,416,995	$	1,401,597	$	18,113	$	1,419,710

	For the Three Months Ended June 30, 2017							For the Six Months Ended June 30, 2017
Consolidated Statements of Operations and Comprehensive Income	As Previously Reported		Impact of Adoption			As Adjusted		As Previously Reported		Impact of Adoption			As Adjusted
Equity in income of unconsolidated entities	$	718	$	(348	)	$	370	$	1,443	$	(696	)	$	747
Income before gain on sales of real estate	$	19,195	$	(348	)	$	18,847	$	38,045	$	(696	)	$	37,349
Net income	$	19,207	$	(348	)	$	18,859	$	42,295	$	(696	)	$	41,599
Net income attributable to COPLP	$	18,300	$	(348	)	$	17,952	$	40,454	$	(696	)	$	39,758
Net income attributable to COPLP common unitholders	$	8,249	$	(348	)	$	7,901	$	27,058	$	(696	)	$	26,362
Comprehensive income	$	18,387	$	(348	)	$	18,039	$	42,883	$	(696	)	$	42,187
Comprehensive income attributable to COPLP	$	17,480	$	(348	)	$	17,132	$	41,042	$	(696	)	$	40,346

XML

Revenue Recognition on Construction Contract and Other Service Revenues (Tables)

6 Months Ended

Jun. 30, 2018

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The table below reports construction contract and other service revenues by compensation arrangement (in thousands):

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2018		2017		2018		2017
Construction contract revenues:
GMP	$	9,539	$	18,317	$	30,025	$	24,906
FFP	6,288		4,587		12,723		10,785
Cost-plus fee	1,496		—		1,554		17
Other	258		234		477		464
	$	17,581	$	23,138	$	44,779	$	36,172

The table below reports construction contract and other service revenues by service type (in thousands):

	For the Three Months Ended June 30,				For the Six Months Ended June 30,
	2018		2017		2018		2017
Construction contract revenues:
Construction	$	16,668	$	21,078	$	42,583	$	31,169
Design	655		1,826		1,719		4,539
Other	258		234		477		464
	$	17,581	$	23,138	$	44,779	$	36,172

Schedule of Accounts Receivable

The beginning and ending balances of accounts receivable related to our construction contracts were as follows (in thousands):

	For the Six Months Ended June 30,
	2018		2017
Beginning balance	$	4,577	$	4,131
Ending balance	$	4,805	$	11,946

Contract with Customer, Asset and Liability

Changes in contract liabilities were as follows (in thousands):

	For the Six Months Ended June 30,
	2018		2017
Beginning balance	$	27,402	$	32,650
Ending balance	$	515	$	40,209
Portion of beginning balance recognized in revenue during:
Three months ended June 30	$	7,999	$	16,762
Six months ended June 30	$	27,296	$	20,961

The beginning and ending balances of our contract assets were as follows (in thousands):

	For the Six Months Ended June 30,
	2018		2017
Beginning balance	$	4,884	$	10,350
Ending balance	$	4,158	$	3,620

XML

Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2018

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 subsidiaries that are accounted for at fair value on a recurring basis as of June 30, 2018 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)	$	—	$	9,792	$	—	$	9,792

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

The table below sets forth financial assets and liabilities of COPT and subsidiaries that are accounted for at fair value on a recurring basis as of June 30, 2018 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	$	4,146	$	—	$	—	$	4,146
Other	48		—		—		48
Interest rate derivatives (1)	—		9,792		—		9,792
Total assets	$	4,194	$	9,792	$	—	$	13,986
Liabilities:
Deferred compensation plan liability (2)	$	—	$	4,194	$	—	$	4,194

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

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

XML

Properties, Net (Tables)

6 Months Ended

Jun. 30, 2018

Real Estate [Abstract]

Schedule of operating properties, net

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

	June 30, 2018			December 31, 2017
Land	$	469,494		$	455,680
Buildings and improvements	3,130,616			3,068,124
Less: Accumulated depreciation	(839,478		)	(786,193		)
Operating properties, net	$	2,760,632		$	2,737,611

Schedule of projects in development or held for future development

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

	June 30, 2018		December 31, 2017
Land	$	232,758	$	240,825
Development in progress, excluding land	190,147		162,669
Projects in development or held for future development	$	422,905	$	403,494

Components of assets held for sale

The table below sets forth the components of this property’s assets as of June 30, 2018 and December 31, 2017 (in thousands):

Properties, net	$	38,670
Deferred rent receivable	3,237
Deferred leasing costs, net	319
Assets held for sale, net	$	42,226

XML

Real Estate Joint Ventures (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 (dollars in thousands):

		Nominal
		Ownership		June 30, 2018 (1)
	Date	% as of		Total		Encumbered		Total
	Acquired	6/30/2018	Nature of Activity	Assets		Assets		Liabilities
LW Redstone Company, LLC	3/23/2010	85%	Development and operation of real estate (2)	$	159,805	$	74,012	$	51,157
M Square Associates, LLC	6/26/2007	50%	Development and operation of real estate (3)	73,395		44,457		46,323
Stevens Investors, LLC	8/11/2015	95%	Development of real estate (4)	75,813		—		4,887
				$	309,013	$	118,469	$	102,367

(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.

XML

Investing Receivables (Tables)

6 Months Ended

Jun. 30, 2018

Receivables [Abstract]

Schedule of investing receivables

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

	June 30, 2018		December 31, 2017
Notes receivable from the City of Huntsville	$	51,386	$	54,472
Other investing loans receivable	3,041		3,021
	$	54,427	$	57,493

XML

Prepaid Expenses and Other Assets, Net (Tables)

6 Months Ended

Jun. 30, 2018

Prepaid Expense and Other Assets [Abstract]

Schedule of prepaid expenses and other assets

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

	June 30, 2018		December 31, 2017
Lease incentives, net	$	18,376	$	19,011
Prepaid expenses	12,173		24,670
Interest rate derivatives	9,792		3,073
Furniture, fixtures and equipment, net	6,407		5,256
Non-real estate equity investments	5,076		5,056
Marketable securities in deferred compensation plan	4,194		4,616
Construction contract costs incurred in excess of billings	4,158		4,884
Restricted cash	4,105		2,570
Deferred tax asset, net (1)	1,774		1,892
Other assets	4,808		3,379
Prepaid expenses and other assets, net	$	70,863	$	74,407

(1) Includes a valuation allowance of $1.4 million.

XML

Debt, Net (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of debt

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

	Carrying Value (1) as of
	June 30, 2018		December 31, 2017		Stated Interest Rates as of	Scheduled Maturity as of
					June 30, 2018	June 30, 2018
Mortgage and Other Secured Debt:
Fixed rate mortgage debt (2)	$	148,950	$	150,723	3.82% - 7.87% (3)	2019-2026
Variable rate secured debt	12,943		13,115		LIBOR + 1.85% (4)	October 2020
Total mortgage and other secured debt	161,893		163,838
Revolving Credit Facility	170,000		126,000		LIBOR + 0.875% to 1.60% (5)	May 2019 (6)
Term Loan Facilities (7)	348,185		347,959		LIBOR + 0.90% to 1.85% (8)	2020-2022
Unsecured Senior Notes
3.600%, $350,000 aggregate principal	347,767		347,551		3.60% (9)	May 2023
5.250%, $250,000 aggregate principal	246,887		246,645		5.25% (10)	February 2024
3.700%, $300,000 aggregate principal	298,567		298,322		3.70% (11)	June 2021
5.000%, $300,000 aggregate principal	296,918		296,731		5.00% (12)	July 2025
Unsecured note payable	1,228		1,287		0% (13)	May 2026
Total debt, net	$	1,871,445	$	1,828,333

(1) The carrying values of our debt other than the Revolving Credit Facility reflect net deferred financing costs of $4.5 million as of June 30, 2018 and $5.0 million as of December 31, 2017.

(2)   Certain of the fixed rate mortgages carry interest rates that, upon assumption, were above or below market rates 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 $315,000 as of June 30, 2018 and $349,000 as of December 31, 2017.

(3) The weighted average interest rate on our fixed rate mortgage debt was 4.18% as of June 30, 2018.

(4)  The interest rate on our variable rate secured debt was 3.83% as of June 30, 2018.

(5) The weighted average interest rate on the Revolving Credit Facility was 3.19% as of June 30, 2018.

(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 June 30, 2018, 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.

(8)  The weighted average interest rate on these loans was 3.35% as of June 30, 2018.

(9) The carrying value of these notes reflects an unamortized discount totaling $1.5 millionas of June 30, 2018 and $1.7 million as of December 31, 2017.  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 $2.8 millionas of June 30, 2018 and $3.0 million as of December 31, 2017.  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 $1.1 millionas of June 30, 2018 and $1.3 million as of December 31, 2017.  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 $2.6 millionas of June 30, 2018 and $2.7 million as of December 31, 2017.  The effective interest rate under the notes, including amortization of the issuance costs, was 5.15%.

(13)  This note carries an interest rate that, upon assumption, was below market rates and it therefore was recorded at its fair value based on applicable effective interest rates.  The carrying value of this note reflects an unamortized discount totaling $333,000 as of June 30, 2018 and $373,000 as of December 31, 2017.

Schedule of the fair value of debt

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

	June 30, 2018				December 31, 2017
	Carrying		Fair		Carrying		Fair
	Amount		Value		Amount		Value
Fixed-rate debt
Unsecured Senior Notes	$	1,190,139	$	1,220,040	$	1,189,249	$	1,229,398
Other fixed-rate debt	150,178		148,257		152,010		152,485
Variable-rate debt	531,128		530,968		487,074		485,694
	$	1,871,445	$	1,899,265	$	1,828,333	$	1,867,577

XML

Interest Rate Derivatives (Tables)

6 Months Ended

Jun. 30, 2018

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	June 30, 2018		December 31, 2017
$	100,000		1.7300%	One-Month LIBOR	9/1/2015	8/1/2019	$	745	$	252
13,026		(1)	1.3900%	One-Month LIBOR	10/13/2015	10/1/2020	343		213
100,000			1.9013%	One-Month LIBOR	9/1/2016	12/1/2022	3,481		1,046
100,000			1.9050%	One-Month LIBOR	9/1/2016	12/1/2022	3,494		1,051
50,000			1.9079%	One-Month LIBOR	9/1/2016	12/1/2022	1,729		511
							$	9,792	$	3,073

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

Schedule of fair value and balance sheet classification of interest rate derivatives

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

		Fair Value at
Derivatives	Balance Sheet Location	June 30, 2018		December 31, 2017
Interest rate swaps designated as cash flow hedges	Prepaid expenses and other assets, net	$	9,792	$	3,073

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):

	Amount of Gain (Loss) Recognized in AOCI on Derivatives										Amount of Gain (Loss) Reclassified from AOCI into Interest Expense on Statement of Operations
	For the Three Months Ended June 30,					For the Six Months Ended June 30,					For the Three Months Ended June 30,					For the Six Months Ended June 30,
Derivatives in Hedging Relationships	2018		2017			2018		2017			2018		2017			2018			2017
Interest rate derivatives	$	1,912	$	(1,800	)	$	6,588	$	(1,576	)	$	47	$	(941	)	$	(198	)	$	(2,125	)

XML

Redeemable Noncontrolling Interests (Tables)

6 Months Ended

Jun. 30, 2018

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 Six Months Ended June 30,
	2018			2017
Beginning balance	$	23,125		$	22,979
Contributions from noncontrolling interests	143			—
Distributions to noncontrolling interests	(711		)	(789		)
Net income attributable to noncontrolling interests	1,229			1,140
Adjustment to arrive at fair value of interests	758			401
Ending balance	$	24,544		$	23,731

XML

Information by Business Segment (Tables)

6 Months Ended

Jun. 30, 2018

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 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			Wholesale Data Center			Other			Total
Three Months Ended June 30, 2018
Revenues from real estate operations	$	61,993		$	13,118		$	12,382		$	8,127		$	3,652		$	5,955		$	105,227		$	15,296		$	8,105		$	534		$	129,162
Property operating expenses	(20,099		)	(4,909		)	(7,494		)	(3,431		)	(1,509		)	(799		)	(38,241		)	(7,169		)	(4,150		)	114			(49,446		)
UJV NOI allocable to COPT	—			—			—			—			—			1,202			1,202			—			—			—			1,202
NOI from real estate operations	$	41,894		$	8,209		$	4,888		$	4,696		$	2,143		$	6,358		$	68,188		$	8,127		$	3,955		$	648		$	80,918
Additions to long-lived assets	$	8,151		$	1,186		$	—		$	1,450		$	351		$	—		$	11,138		$	5,361		$	81		$	188		$	16,768
Transfers from non-operating properties	$	3,035		$	352		$	—		$	3		$	26		$	29,675		$	33,091		$	—		$	1,133		$	—		$	34,224
Three Months Ended June 30, 2017
Revenues from real estate operations	$	61,284		$	11,095		$	13,029		$	7,449		$	3,624		$	5,800		$	102,281		$	17,462		$	7,033		$	1,521		$	128,297
Property operating expenses	(20,129		)	(4,219		)	(8,130		)	(3,025		)	(1,491		)	(577		)	(37,571		)	(7,082		)	(3,501		)	(474		)	(48,628		)
UJV NOI allocable to COPT	—			—			—			—			—			1,198			1,198			—			—			—			1,198
NOI from real estate operations	$	41,155		$	6,876		$	4,899		$	4,424		$	2,133		$	6,421		$	65,908		$	10,380		$	3,532		$	1,047		$	80,867
Additions to long-lived assets	$	5,853		$	977		$	16		$	2,231		$	84		$	—		$	9,161		$	4,018		$	2,005		$	(29	)	$	15,155
Transfers from non-operating properties	$	18,159		$	218		$	—		$	466		$	1,709		$	26,215		$	46,767		$	(25	)	$	—		$	—		$	46,742
Six Months Ended June 30, 2018
Revenues from real estate operations	$	124,775		$	25,679		$	23,825		$	15,997		$	7,285		$	11,786		$	209,347		$	30,580		$	16,182		$	1,331		$	257,440
Property operating expenses	(41,703		)	(9,632		)	(14,092		)	(6,735		)	(2,949		)	(1,593		)	(76,704		)	(15,047		)	(8,408		)	(238		)	(100,397		)
UJV NOI allocable to COPT	—			—			—			—			—			2,401			2,401			—			—			—			2,401
NOI from real estate operations	$	83,072		$	16,047		$	9,733		$	9,262		$	4,336		$	12,594		$	135,044		$	15,533		$	7,774		$	1,093		$	159,444
Additions to long-lived assets	$	15,272		$	3,126		$	—		$	2,558		$	430		$	—		$	21,386		$	9,245		$	117		$	315		$	31,063
Transfers from non-operating properties	$	20,221		$	693		$	—		$	—		$	470		$	30,789		$	52,173		$	—		$	2,145		$	—		$	54,318
Segment assets at June 30, 2018	$	1,269,525		$	396,139		$	126,956		$	190,537		$	106,374		$	330,622		$	2,420,153		$	396,847		$	221,239		$	4,213		$	3,042,452
Six Months Ended June 30, 2017
Revenues from real estate operations	$	122,139		$	22,802		$	24,663		$	14,459		$	7,084		$	11,322		$	202,469		$	35,738		$	13,803		$	3,054		$	255,064
Property operating expenses	(40,649		)	(8,671		)	(14,932		)	(6,234		)	(2,862		)	(1,236		)	(74,584		)	(14,568		)	(6,866		)	(1,129		)	(97,147		)
UJV NOI allocable to COPT	—			—			—			—			—			2,400			2,400			—			—			—			2,400
NOI from real estate operations	$	81,490		$	14,131		$	9,731		$	8,225		$	4,222		$	12,486		$	130,285		$	21,170		$	6,937		$	1,925		$	160,317
Additions to long-lived assets	$	9,275		$	3,445		$	16		$	4,399		$	216		$	—		$	17,351		$	11,138		$	3,579		$	127		$	32,195
Transfers from non-operating properties	$	31,575		$	440		$	—		$	466		$	1,705		$	25,200		$	59,386		$	(25	)	$	8		$	18		$	59,387
Segment assets at June 30, 2017	$	1,267,635		$	357,747		$	130,431		$	195,732		$	109,586		$	247,974		$	2,309,105		$	435,399		$	229,224		$	19,350		$	2,993,078

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 June 30,				For the Six Months Ended June 30,
	2018		2017		2018		2017
Segment revenues from real estate operations	$	129,162	$	128,297	$	257,440	$	255,064
Construction contract and other service revenues	17,581		23,138		44,779		36,172
Total revenues	$	146,743	$	151,435	$	302,219	$	291,236

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
UJV NOI allocable to COPT	$	1,202		$	1,198		$	2,401		$	2,400
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(828		)	(827		)	(1,652		)	(1,651		)
Add: Equity in loss of unconsolidated non-real estate entities	(1		)	(1		)	(3		)	(2		)
Equity in income of unconsolidated entities	$	373		$	370		$	746		$	747

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Construction contract and other service revenues	$	17,581		$	23,138		$	44,779		$	36,172
Construction contract and other service expenses	(16,941		)	(22,315		)	(43,157		)	(34,801		)
NOI from service operations	$	640		$	823		$	1,622		$	1,371

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

	For the Three Months Ended June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
NOI from real estate operations	$	80,918		$	80,867		$	159,444		$	160,317
NOI from service operations	640			823			1,622			1,371
Interest and other income	1,439			1,583			2,798			3,309
Equity in income of unconsolidated entities	373			370			746			747
Income tax expense	(63		)	(48		)	(118		)	(88		)
Depreciation and other amortization associated with real estate operations	(33,190		)	(32,793		)	(66,702		)	(65,852		)
Impairment losses	—			(1,625		)	—			(1,625		)
General, administrative and leasing expenses	(7,628		)	(7,859		)	(14,920		)	(16,470		)
Business development expenses and land carry costs	(1,234		)	(1,597		)	(2,848		)	(3,290		)
Interest expense	(18,945		)	(19,163		)	(37,729		)	(38,157		)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,202		)	(1,198		)	(2,401		)	(2,400		)
Loss on early extinguishment of debt	—			(513		)	—			(513		)
Income before gain on sales of real estate	$	21,108		$	18,847		$	39,892		$	37,349

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):

	June 30, 2018		June 30, 2017
Segment assets	$	3,042,452	$	2,993,078
Non-operating property assets	431,661		452,824
Other assets	138,249		146,402
Total COPT consolidated assets	$	3,612,362	$	3,592,304

XML

Share-Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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	100% of PSUs granted
25th	50% of PSUs granted
Below 25th	0% of PSUs granted

XML

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

6 Months Ended

Jun. 30, 2018

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Numerator:
Net income attributable to COPT	$	19,434		$	17,526		$	36,584		$	38,545
Preferred share dividends	—			(3,039		)	—			(6,219		)
Issuance costs associated with redeemed preferred shares	—			(6,847		)	—			(6,847		)
Income attributable to share-based compensation awards	(117		)	(117		)	(234		)	(242		)
Numerator for basic and diluted EPS on net income attributable to COPT common shareholders	$	19,317		$	7,523		$	36,350		$	25,237
Denominator (all weighted averages):
Denominator for basic EPS (common shares)	101,789			99,036			101,397			98,725
Dilutive effect of share-based compensation awards	119			160			131			158
Denominator for diluted EPS (common shares)	101,908			99,196			101,528			98,883
Basic EPS	$	0.19		$	0.08		$	0.36		$	0.26
Diluted EPS	$	0.19		$	0.08		$	0.36		$	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 June 30,		For the Six Months Ended June 30,
	2018	2017	2018	2017
Conversion of common units	3,197	3,405	3,208	3,425
Conversion of Series I preferred units	176	176	176	176

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 June 30,						For the Six Months Ended June 30,
	2018			2017			2018			2017
Numerator:
Net income attributable to COPLP	$	20,207		$	17,952		$	38,066		$	39,758
Preferred unit distributions	(165		)	(3,204		)	(330		)	(6,549		)
Issuance costs associated with redeemed preferred units	—			(6,847		)	—			(6,847		)
Income attributable to share-based compensation awards	(117		)	(117		)	(234		)	(242		)
Numerator for basic and diluted EPU on net income attributable to COPLP common unitholders	$	19,925		$	7,784		$	37,502		$	26,120
Denominator (all weighted averages):
Denominator for basic EPU (common units)	104,986			102,441			104,605			102,150
Dilutive effect of share-based compensation awards	119			160			131			158
Denominator for diluted EPU (common units)	105,105			102,601			104,736			102,308
Basic EPU	$	0.19		$	0.08		$	0.36		$	0.26
Diluted EPU	$	0.19		$	0.08		$	0.36		$	0.26

XML

Commitments and Contingencies (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 follow (in thousands):

Year Ending December 31,
2018 (1)	$	644
2019	1,277
2020	1,270
2021	1,274
2022	1,158
Thereafter	84,611
	$	90,234

(1) Represents the six months ending December 31, 2018.

Future minimum lease payments for capital leases

The remaining capital lease obligation as of June 30, 2018 was comprised of the following (in thousands):

Minimum rental payments due in 2020	$	660
Less: Amount representing interest	(20		)
Capital lease obligation	$	640

XML

Organization (Details) - Jun. 30, 2018 ft² in Millions	a	MW	ft²	Property
Operating Properties
Investments in real estate
Number of real estate properties				159
Area of real estate property (in square feet or acres) | ft²			17.7
Operating Properties | Office Properties
Investments in real estate
Number of real estate properties				143
Operating Properties | Single-tenant data centers
Investments in real estate
Number of real estate properties				16
Properties under, or contractually committed for, construction or approved for redevelopment
Investments in real estate
Number of real estate properties				9
Area of real estate property (in square feet or acres) | ft²			1.0
Properties under, or contractually committed for, construction or approved for redevelopment | Office Properties
Investments in real estate
Number of real estate properties				5
Properties under, or contractually committed for, construction or approved for redevelopment | Single-tenant data centers
Investments in real estate
Number of real estate properties				4
Properties under, or contractually committed for, construction or approved for redevelopment | Partially operational properties
Investments in real estate
Number of real estate properties				1
Land controlled for future development
Investments in real estate
Area of real estate property (in square feet or acres)	1,000		12.3
Other Land
Investments in real estate
Area of real estate property (in square feet or acres) | a	150
Operating wholesale data centers
Investments in real estate
Critical load (in megawatts) | MW		19.25
GI-COPT | Operating Properties | Single-tenant data centers
Investments in real estate
Number of real estate properties				6

XML

Organization (Details 2)	6 Months Ended
	Jun. 30, 2018
Corporate Office Properties, L.P. | Common Units
Forms of ownership in Operating Partnership and ownership percentage by the entity
Percentage ownership in operating partnership	97.00%

XML

Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Minimum rental payments due		$ 90,234
Ground Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Minimum rental payments due		$ 89,400
Accounting Standards Update 2017-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Effect of change on net income	$ 18,000
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change for adoption of hedge accounting guidance				$ 276
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change for adoption of hedge accounting guidance			$ 276
Accumulated Other Comprehensive Income (Loss) | Corporate Office Properties, L.P.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change for adoption of hedge accounting guidance				276
Accumulated Other Comprehensive Income (Loss) | Corporate Office Properties, L.P. | Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change for adoption of hedge accounting guidance			276
Cumulative Distributions in Excess of Net Income
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change for adoption of hedge accounting guidance				(276)
Cumulative Distributions in Excess of Net Income | Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change for adoption of hedge accounting guidance			(276)
Common Shares | Corporate Office Properties, L.P.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change for adoption of hedge accounting guidance				$ (276)
Common Shares | Corporate Office Properties, L.P. | Accounting Standards Update 2017-12
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of accounting change for adoption of hedge accounting guidance			$ (276)

XML

Summary of Significant Accounting Policies (Details 2) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities	$ 80,712	$ 117,529
Net cash used in investing activities	(96,808)	(58,777)
Net decrease in cash and cash equivalents and restricted cash	(2,254)	(199,292)
Beginning of period	14,831	212,619
End of period	$ 12,577	13,327
Accounting Standards Update 2016-18
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		(208)
Net cash used in investing activities		173
Net decrease in cash and cash equivalents and restricted cash		(35)
Beginning of period		2,756
End of period		2,721
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Net cash provided by operating activities		117,737
Net cash used in investing activities		(58,950)
Net decrease in cash and cash equivalents and restricted cash		(199,257)
Beginning of period		209,863
End of period		$ 10,606

XML

Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in unconsolidated real estate joint venture	$ 40,806	$ 42,752	$ 40,806	$ 42,752	$ 41,787	$ 43,661
Cumulative distributions in excess of net income	(822,270)	(777,049)	(822,270)	(777,049)	(802,085)	(747,825)
Noncontrolling interests in subsidiaries	66,280	67,339	66,280	67,339	66,165	72,267
Common units	1,033		1,033		1,013
Equity in income of unconsolidated entities	373	370	746	747
Income before gain on sales of real estate	21,108	18,847	39,892	37,349
Net income	21,085	18,859	39,865	41,599
Net income attributable to noncontrolling interests - Common units in COPLP	(608)	(261)	(1,152)	(883)
Net income attributable to COPT/COPLP	19,434	17,526	36,584	38,545
Net income attributable to COPT/COPLP common share/unit holders	19,434	7,640	36,584	25,479
Comprehensive income	22,950	18,039	46,651	42,187
Comprehensive income attributable to COPT/ COPLP	21,242	16,733	43,153	39,113
Corporate Office Properties, L.P.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in unconsolidated real estate joint venture	40,806	42,752	40,806	42,752	41,787	43,661
Noncontrolling interests in subsidiaries	12,875		12,875		12,312
Common units	1,477,575	1,416,995	1,477,575	1,416,995	1,445,022	1,419,710
Equity in income of unconsolidated entities	373	370	746	747
Income before gain on sales of real estate	21,108	18,847	39,892	37,349
Net income	21,085	18,859	39,865	41,599
Net income attributable to COPT/COPLP	20,207	17,952	38,066	39,758
Net income attributable to COPT/COPLP common share/unit holders	20,042	7,901	37,736	26,362
Comprehensive income	22,950	18,039	46,651	42,187
Comprehensive income attributable to COPT/ COPLP	$ 22,072	17,132	$ 44,852	40,346
As Previously Reported
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in unconsolidated real estate joint venture		25,335		25,335	25,066	25,548
Cumulative distributions in excess of net income		(793,828)		(793,828)	(818,190)	(765,276)
Noncontrolling interests in subsidiaries		66,701		66,701	65,549	71,605
Equity in income of unconsolidated entities		718		1,443
Income before gain on sales of real estate		19,195		38,045
Net income		19,207		42,295
Net income attributable to noncontrolling interests - Common units in COPLP		(273)		(907)
Net income attributable to COPT/COPLP		17,862		39,217
Net income attributable to COPT/COPLP common share/unit holders		7,976		26,151
Comprehensive income		18,387		42,883
Comprehensive income attributable to COPT/ COPLP		17,069		39,785
As Previously Reported | Corporate Office Properties, L.P.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in unconsolidated real estate joint venture		25,335		25,335	25,066	25,548
Common units		1,399,578		1,399,578	1,428,301	1,401,597
Equity in income of unconsolidated entities		718		1,443
Income before gain on sales of real estate		19,195		38,045
Net income		19,207		42,295
Net income attributable to COPT/COPLP		18,300		40,454
Net income attributable to COPT/COPLP common share/unit holders		8,249		27,058
Comprehensive income		18,387		42,883
Comprehensive income attributable to COPT/ COPLP		17,480		41,042
Accounting Standards Update 2017-05
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in unconsolidated real estate joint venture		17,417		17,417	16,721	18,113
Cumulative distributions in excess of net income		16,779		16,779	16,105	17,451
Noncontrolling interests in subsidiaries		638		638	616	662
Equity in income of unconsolidated entities		(348)		(696)
Income before gain on sales of real estate		(348)		(696)
Net income		(348)		(696)
Net income attributable to noncontrolling interests - Common units in COPLP		12		24
Net income attributable to COPT/COPLP		(336)		(672)
Net income attributable to COPT/COPLP common share/unit holders		(336)		(672)
Comprehensive income		(348)		(696)
Comprehensive income attributable to COPT/ COPLP		(336)		(672)
Accounting Standards Update 2017-05 | Corporate Office Properties, L.P.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Investment in unconsolidated real estate joint venture		17,417		17,417	16,721	18,113
Common units		17,417		17,417	$ 16,721	$ 18,113
Equity in income of unconsolidated entities		(348)		(696)
Income before gain on sales of real estate		(348)		(696)
Net income		(348)		(696)
Net income attributable to COPT/COPLP		(348)		(696)
Net income attributable to COPT/COPLP common share/unit holders		(348)		(696)
Comprehensive income		(348)		(696)
Comprehensive income attributable to COPT/ COPLP		$ (348)		$ (696)

XML

Revenue Recognition on Construction Contract and Other Service Revenues (Details) - Construction Contract Revenue $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) compensation_arrangement	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) compensation_arrangement	Jun. 30, 2017 USD ($)
Disaggregation of Revenue [Line Items]
Number of compensation arrangement types | compensation_arrangement	3		3
Performance obligations satisfied or already satisfied	$ 10	$ 401	$ 319	$ 547
Customers payment period			30 days
Remaining performance obligations	$ 16,100		$ 16,100

XML

Revenue Recognition on Construction Contract and Other Service Revenues (Details 1) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	$ 17,581	$ 23,138	$ 44,779	$ 36,172
Construction
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	16,668	21,078	42,583	31,169
Design
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	655	1,826	1,719	4,539
Other
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	258	234	477	464
GMP
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	9,539	18,317	30,025	24,906
FFP
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	6,288	4,587	12,723	10,785
Cost-plus fee
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	1,496	0	1,554	17
Other
Disaggregation of Revenue [Line Items]
Construction contract and other service revenues	$ 258	$ 234	$ 477	$ 464

XML

Revenue Recognition on Construction Contract and Other Service Revenues (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Change in Accounts Receivable
Beginning balance	$ 23,656		$ 23,656		$ 31,802
Ending balance	23,656		23,656		31,802
Construction Contract Revenue
Change in Accounts Receivable
Beginning balance	4,805	$ 11,946	4,805	$ 11,946	4,577	$ 4,131
Ending balance	4,805	11,946	4,805	11,946	4,577	4,131
Change in Contract with Customer, Asset
Beginning balance	4,158	3,620	4,158	3,620	4,884	10,350
Ending balance	4,158	3,620	4,158	3,620	4,884	10,350
Change in Contract with Customer, Liability
Beginning balance	515	40,209	515	40,209	27,402	32,650
Ending balance	515	40,209	515	40,209	$ 27,402	$ 32,650
Revenue recognized included in beginning balance	$ 7,999	$ 16,762	$ 27,296	$ 20,961

XML

Fair Value Measurements (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Assets and liabilities measured at fair value
Marketable securities in deferred compensation plan	$ 4,194	$ 4,616
Deferred compensation plan | Trustees and Management
Assets and liabilities measured at fair value
Maximum percentage of participants' compensation which is deferrable (as a percent)	100.00%
Marketable securities in deferred compensation plan	$ 4,200

XML

Fair Value Measurements (Details 2) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets:
Marketable securities in deferred compensation plan	$ 4,194	$ 4,616
Fair value measurement on a recurring basis
Assets:
Interest rate derivatives	9,792
Total assets	13,986
Liabilities:
Deferred compensation plan liability	4,194
Fair value measurement on a recurring basis | Mutual funds
Assets:
Marketable securities in deferred compensation plan	4,146
Fair value measurement on a recurring basis | Other
Assets:
Marketable securities in deferred compensation plan	48
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets	4,194
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds
Assets:
Marketable securities in deferred compensation plan	4,146
Fair value measurement on a recurring basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other
Assets:
Marketable securities in deferred compensation plan	48
Fair value measurement on a recurring basis | Significant Other Observable Inputs (Level 2)
Assets:
Interest rate derivatives	9,792
Total assets	9,792
Liabilities:
Deferred compensation plan liability	4,194
Fair value measurement on a recurring basis | Corporate Office Properties, L.P.
Assets:
Interest rate derivatives	9,792
Fair value measurement on a recurring basis | Corporate Office Properties, L.P. | Significant Other Observable Inputs (Level 2)
Assets:
Interest rate derivatives	$ 9,792

XML

Properties, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investments in real estate
Operating properties, net	$ 2,760,632	$ 2,737,611
Operating Properties
Investments in real estate
Less: accumulated depreciation	(839,478)	(786,193)
Operating properties, net	2,760,632	2,737,611
Operating Properties | Land
Investments in real estate
Gross	469,494	455,680
Operating Properties | Buildings and improvements
Investments in real estate
Gross	$ 3,130,616	$ 3,068,124

XML

Properties, Net (Details 2) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Properties
Projects in development or held for future development	$ 422,905	$ 403,494
Projects in development or held for future development
Properties
Projects in development or held for future development	422,905	403,494
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	232,758	240,825
Projects in development or held for future development | Development in progress, excluding land
Properties
Projects in development or held for future development	$ 190,147	$ 162,669

XML

Properties, Net (Details 3) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets held for sale, net	$ 42,226	$ 42,226
Assets held for sale, net
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Properties, net	38,670	38,670
Deferred rent receivable	3,237	3,237
Deferred leasing costs, net	319	319
Assets held for sale, net	42,226	$ 42,226
11751 Meadowville Lane | Operating Properties | 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]
Indemnification amount	$ 20,000

XML

Properties, Net (Details 4) ft² in Thousands	Jun. 30, 2018 ft² Property
Newly constructed properties placed in service
Construction, Redevelopment and Dispositions
Square footage of real estate properties (in square feet) | ft²	223
Number of real estate properties	2
Newly redeveloped properties placed in service
Construction, Redevelopment and Dispositions
Square footage of real estate properties (in square feet) | ft²	13
Number of real estate properties	1
Properties under construction or contractually committed for construction
Construction, Redevelopment and Dispositions
Square footage of real estate properties (in square feet) | ft²	880
Number of real estate properties	7
Properties under construction or contractually committed, partially operational property
Construction, Redevelopment and Dispositions
Number of real estate properties	1
Properties under or approved for redevelopment
Construction, Redevelopment and Dispositions
Square footage of real estate properties (in square feet) | ft²	128
Number of real estate properties	2

XML

Real Estate Joint Ventures (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) Property
GI-COPT
Investments in consolidated real estate joint ventures
Real estate equity method investments	$ 40,800
Consolidated real estate joint ventures
Investments in consolidated real estate joint ventures
Total Assets	309,013
Encumbered Assets	118,469
Total Liabilities	$ 102,367
Variable Interest Entity, Primary Beneficiary | LW Redstone Company, LLC
Investments in consolidated real estate joint ventures
Ownership (as a percent)	85.00%
Total Assets	$ 159,805
Encumbered Assets	74,012
Total Liabilities	$ 51,157
Variable Interest Entity, Primary Beneficiary | M Square Associates, LLC
Investments in consolidated real estate joint ventures
Ownership (as a percent)	50.00%
Total Assets	$ 73,395
Encumbered Assets	44,457
Total Liabilities	$ 46,323
Variable Interest Entity, Primary Beneficiary | Stevens Investors, LLC
Investments in consolidated real estate joint ventures
Ownership (as a percent)	95.00%
Total Assets	$ 75,813
Encumbered Assets	0
Total Liabilities	$ 4,887
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

XML

Investing Receivables (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 54,427	$ 57,493
Notes Receivable from City of Huntsville
Accounts, Notes, Loans and Financing Receivable [Line Items]
Investing receivables	$ 51,386	54,472
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	$ 3,041	$ 3,021

XML

Prepaid Expenses and Other Assets, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Prepaid Expense and Other Assets [Abstract]
Lease incentives, net	$ 18,376	$ 19,011
Prepaid expenses	12,173	24,670
Interest rate derivatives	9,792	3,073
Furniture, fixtures and equipment, net	6,407	5,256
Non-real estate equity investments	5,076	5,056
Marketable securities in deferred compensation plan	4,194	4,616
Construction contract costs incurred in excess of billings	4,158	4,884
Restricted cash	4,105	2,570	$ 2,721	$ 2,756
Deferred tax asset, net	1,774	1,892
Other assets	4,808	3,379
Prepaid expenses and other assets, net	70,863	74,407
Taxable REIT Subsidiary
Mortgage and Other Investing Receivables [Line Items]
Deferred tax assets, valuation allowance	$ 1,400	$ 1,400

XML

Debt, Net (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) extension	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) extension	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt
Carrying Value	$ 1,871,445,000		$ 1,871,445,000		$ 1,828,333,000
Interest costs capitalized	1,400,000	$ 1,600,000	2,800,000	$ 3,100,000
Secured Debt
Debt
Carrying Value	$ 161,893,000		$ 161,893,000		163,838,000
Line of Credit | Revolving Credit Facility
Debt
Number of extensions | extension	2		2
Extension option period (in years)			6 months
Line of credit facility, extension fee percentage			0.075%
Loans payable
Debt
Deferred financing costs, net	$ 4,500,000		$ 4,500,000		5,000,000
Fixed rate debt | Secured Debt
Debt
Carrying Value	148,950,000		148,950,000		150,723,000
Unamortized premium included in carrying value	$ 315,000		$ 315,000		349,000
Weighted average interest rate (as a percent)	4.18%		4.18%
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 | Secured Debt
Debt
Carrying Value	$ 12,943,000		$ 12,943,000		13,115,000
Stated interest rate (as a percent)	3.83%		3.83%
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		126,000,000
Weighted average interest rate (as a percent)	3.19%		3.19%
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	$ 348,185,000		$ 348,185,000		347,959,000
Weighted average interest rate (as a percent)	3.35%		3.35%
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)			1.85%
3.60% Senior Notes | Unsecured senior notes
Debt
Carrying Value	347,767,000		$ 347,767,000		347,551,000
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	$ 1,500,000		$ 1,500,000		1,700,000
Interest rate on debt (as a percent)	3.70%		3.70%
5.250% Senior Notes | Unsecured senior notes
Debt
Carrying Value	$ 246,887,000		$ 246,887,000		246,645,000
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	$ 2,800,000		$ 2,800,000		3,000,000
Interest rate on debt (as a percent)	5.49%		5.49%
3.70% Senior Notes | Unsecured senior notes
Debt
Carrying Value	$ 298,567,000		$ 298,567,000		298,322,000
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	$ 1,100,000		$ 1,100,000		1,300,000
Interest rate on debt (as a percent)	3.85%		3.85%
5.000% Senior Notes | Unsecured senior notes
Debt
Carrying Value	$ 296,918,000		$ 296,918,000		296,731,000
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	$ 2,600,000		$ 2,600,000		2,700,000
Interest rate on debt (as a percent)	5.15%		5.15%
Unsecured notes payable
Debt
Carrying Value	$ 1,228,000		$ 1,228,000		1,287,000
Stated interest rate (as a percent)	0.00%		0.00%
Unamortized discount included in carrying value	$ 333,000		$ 333,000		$ 373,000

XML

Debt, Net (Details 2) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Carrying Amount
Carrying amount and estimated fair value of debt
Long-term debt	$ 1,871,445	$ 1,828,333
Carrying Amount | Unsecured senior notes
Carrying amount and estimated fair value of debt
Long-term debt	1,190,139	1,189,249
Carrying Amount | Other fixed-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	150,178	152,010
Carrying Amount | Variable-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	531,128	487,074
Estimated Fair Value
Carrying amount and estimated fair value of debt
Long-term debt	1,899,265	1,867,577
Estimated Fair Value | Unsecured senior notes
Carrying amount and estimated fair value of debt
Long-term debt	1,220,040	1,229,398
Estimated Fair Value | Other fixed-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	148,257	152,485
Estimated Fair Value | Variable-rate debt
Carrying amount and estimated fair value of debt
Long-term debt	$ 530,968	$ 485,694

XML

Interest Rate Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Fair value of interest rate derivatives and balance sheet classification
Interest rate swaps designated as cash flow hedges	$ 9,792		$ 9,792		$ 3,073
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of Gain (Loss) Recognized in AOCI on Derivatives	1,912	$ (1,800)	6,588	$ (1,576)
Interest rate swaps | Interest Expense
Effect of interest rate derivatives on consolidated statements of operations and comprehensive income
Amount of Gain (Loss) Reclassified from AOCI into Interest Expense on Statement of Operations	47	$ (941)	(198)	$ (2,125)
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	9,792		9,792		3,073
Designated
Fair values of interest rate swap derivatives
Fair value of interest rate swaps	9,792		9,792		3,073
Designated | 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	(1,900)		(1,900)
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	$ 745		$ 745		252
Designated | Interest rate swap, effective October 13, 2015
Fair values of interest rate swap derivatives
Notional Amount	$ 13,026		$ 13,026
Fixed rate (as a percent)	1.39%		1.39%
Fair value of interest rate swaps	$ 343		$ 343		213
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	$ 3,481		$ 3,481		1,046
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	$ 3,494		$ 3,494		1,051
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	$ 1,729		$ 1,729		$ 511

XML

Redeemable Noncontrolling Interests (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018 USD ($) joint_venture	Jun. 30, 2017 USD ($)
Noncontrolling Interest [Abstract]
Number of joint ventures with redeemable noncontrolling interests | joint_venture	2
Redeemable Noncontrolling Interest [Roll Forward]
Beginning balance	$ 23,125	$ 22,979
Contributions from noncontrolling interests	143	0
Distributions to noncontrolling interests	(711)	(789)
Net income attributable to noncontrolling interests	1,229	1,140
Adjustment to arrive at fair value of interests	758	401
Ending balance	$ 24,544	$ 23,731

XML

Equity (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Class of Stock [Line Items]
Conversion of common units to common shares (in units/shares)	53,817	187,000
Forward Equity Sale Agreement
Class of Stock [Line Items]
Proceeds from common shares issued under forward equity sale agreements	$ 52.3
Forward Equity Sale Agreement | Common Shares
Class of Stock [Line Items]
Number of shares issued	1,800,000
Remaining capacity under forward equity sale agreements	5,700,000
Common Stock Issued to Public Under At-the-Market Program | Common Shares
Class of Stock [Line Items]
At-market stock, offering program established, remaining capacity	$ 70.0

XML

Information by Business Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment financial information for real estate operations
Revenues from real estate operations	$ 129,162	$ 128,297	$ 257,440	$ 255,064
Property operating expenses	(49,446)	(48,628)	(100,397)	(97,147)
UJV NOI allocable to COPT	1,202	1,198	2,401	2,400
NOI from real estate operations	80,918	80,867	159,444	160,317
Additions to long-lived assets	16,768	15,155	31,063	32,195
Transfers from non-operating properties	34,224	46,742	54,318	59,387
Segment assets	3,612,362	3,592,304	3,612,362	3,592,304	$ 3,595,205
Defense/Information Technology Locations
Segment financial information for real estate operations
Revenues from real estate operations	105,227	102,281	209,347	202,469
Property operating expenses	(38,241)	(37,571)	(76,704)	(74,584)
UJV NOI allocable to COPT	1,202	1,198	2,401	2,400
NOI from real estate operations	68,188	65,908	135,044	130,285
Additions to long-lived assets	11,138	9,161	21,386	17,351
Transfers from non-operating properties	33,091	46,767	52,173	59,386
Defense/Information Technology Locations | Fort Meade/BW Corridor
Segment financial information for real estate operations
Revenues from real estate operations	61,993	61,284	124,775	122,139
Property operating expenses	(20,099)	(20,129)	(41,703)	(40,649)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	41,894	41,155	83,072	81,490
Additions to long-lived assets	8,151	5,853	15,272	9,275
Transfers from non-operating properties	3,035	18,159	20,221	31,575
Defense/Information Technology Locations | Northern Virginia Defense/IT
Segment financial information for real estate operations
Revenues from real estate operations	13,118	11,095	25,679	22,802
Property operating expenses	(4,909)	(4,219)	(9,632)	(8,671)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	8,209	6,876	16,047	14,131
Additions to long-lived assets	1,186	977	3,126	3,445
Transfers from non-operating properties	352	218	693	440
Defense/Information Technology Locations | Lackland Air Force Base
Segment financial information for real estate operations
Revenues from real estate operations	12,382	13,029	23,825	24,663
Property operating expenses	(7,494)	(8,130)	(14,092)	(14,932)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	4,888	4,899	9,733	9,731
Additions to long-lived assets	0	16	0	16
Transfers from non-operating properties	0	0	0	0
Defense/Information Technology Locations | Navy Support Locations
Segment financial information for real estate operations
Revenues from real estate operations	8,127	7,449	15,997	14,459
Property operating expenses	(3,431)	(3,025)	(6,735)	(6,234)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	4,696	4,424	9,262	8,225
Additions to long-lived assets	1,450	2,231	2,558	4,399
Transfers from non-operating properties	3	466	0	466
Defense/Information Technology Locations | Redstone Arsenal
Segment financial information for real estate operations
Revenues from real estate operations	3,652	3,624	7,285	7,084
Property operating expenses	(1,509)	(1,491)	(2,949)	(2,862)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	2,143	2,133	4,336	4,222
Additions to long-lived assets	351	84	430	216
Transfers from non-operating properties	26	1,709	470	1,705
Defense/Information Technology Locations | Data Center Shells
Segment financial information for real estate operations
Revenues from real estate operations	5,955	5,800	11,786	11,322
Property operating expenses	(799)	(577)	(1,593)	(1,236)
UJV NOI allocable to COPT	1,202	1,198	2,401	2,400
NOI from real estate operations	6,358	6,421	12,594	12,486
Additions to long-lived assets	0	0	0	0
Transfers from non-operating properties	29,675	26,215	30,789	25,200
Regional Office
Segment financial information for real estate operations
Revenues from real estate operations	15,296	17,462	30,580	35,738
Property operating expenses	(7,169)	(7,082)	(15,047)	(14,568)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	8,127	10,380	15,533	21,170
Additions to long-lived assets	5,361	4,018	9,245	11,138
Transfers from non-operating properties	0	(25)	0	(25)
Operating wholesale data centers
Segment financial information for real estate operations
Revenues from real estate operations	8,105	7,033	16,182	13,803
Property operating expenses	(4,150)	(3,501)	(8,408)	(6,866)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	3,955	3,532	7,774	6,937
Additions to long-lived assets	81	2,005	117	3,579
Transfers from non-operating properties	1,133	0	2,145	8
Other Segments
Segment financial information for real estate operations
Revenues from real estate operations	534	1,521	1,331	3,054
Property operating expenses	114	(474)	(238)	(1,129)
UJV NOI allocable to COPT	0	0	0	0
NOI from real estate operations	648	1,047	1,093	1,925
Additions to long-lived assets	188	(29)	315	127
Transfers from non-operating properties	0	0	0	18
Segment assets
Segment financial information for real estate operations
Segment assets	3,042,452	2,993,078	3,042,452	2,993,078
Segment assets | Defense/Information Technology Locations
Segment financial information for real estate operations
Segment assets	2,420,153	2,309,105	2,420,153	2,309,105
Segment assets | Defense/Information Technology Locations | Fort Meade/BW Corridor
Segment financial information for real estate operations
Segment assets	1,269,525	1,267,635	1,269,525	1,267,635
Segment assets | Defense/Information Technology Locations | Northern Virginia Defense/IT
Segment financial information for real estate operations
Segment assets	396,139	357,747	396,139	357,747
Segment assets | Defense/Information Technology Locations | Lackland Air Force Base
Segment financial information for real estate operations
Segment assets	126,956	130,431	126,956	130,431
Segment assets | Defense/Information Technology Locations | Navy Support Locations
Segment financial information for real estate operations
Segment assets	190,537	195,732	190,537	195,732
Segment assets | Defense/Information Technology Locations | Redstone Arsenal
Segment financial information for real estate operations
Segment assets	106,374	109,586	106,374	109,586
Segment assets | Defense/Information Technology Locations | Data Center Shells
Segment financial information for real estate operations
Segment assets	330,622	247,974	330,622	247,974
Segment assets | Regional Office
Segment financial information for real estate operations
Segment assets	396,847	435,399	396,847	435,399
Segment assets | Operating wholesale data centers
Segment financial information for real estate operations
Segment assets	221,239	229,224	221,239	229,224
Segment assets | Other Segments
Segment financial information for real estate operations
Segment assets	$ 4,213	$ 19,350	$ 4,213	$ 19,350

XML

Information by Business Segment (Details 2) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reconciliation of segment revenues to total revenues
Segment revenues from real estate operations	$ 129,162	$ 128,297	$ 257,440	$ 255,064
Construction contract and other service revenues	17,581	23,138	44,779	36,172
Total revenues	146,743	151,435	302,219	291,236
Reconciliation of UJV NOI allocable to COPT to Equity Income in Unconsolidated Entities
UJV NOI allocable to COPT	1,202	1,198	2,401	2,400
Less: Income from UJV allocable to COPT attributable to depreciation and amortization expense and interest expense	(828)	(827)	(1,652)	(1,651)
Add: Equity in loss of unconsolidated non-real estate entities	(1)	(1)	(3)	(2)
Equity in income of unconsolidated entities	373	370	746	747
Computation of net operating income from service operations
Construction contract and other service revenues	17,581	23,138	44,779	36,172
Construction contract and other service expenses	(16,941)	(22,315)	(43,157)	(34,801)
NOI from service operations	$ 640	$ 823	$ 1,622	$ 1,371

XML

Information by Business Segment (Details 3) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Reconciliation of NOI from real estate operations and NOI from service operations to (loss) income from continuing operations
NOI from real estate operations	$ 80,918	$ 80,867	$ 159,444	$ 160,317
NOI from service operations	640	823	1,622	1,371
Interest and other income	1,439	1,583	2,798	3,309
Equity in income of unconsolidated entities	373	370	746	747
Income tax expense	(63)	(48)	(118)	(88)
Depreciation and other amortization associated with real estate operations	(33,190)	(32,793)	(66,702)	(65,852)
Impairment losses	0	(1,625)	0	(1,625)
General, administrative and leasing expenses	(7,628)	(7,859)	(14,920)	(16,470)
Business development expenses and land carry costs	(1,234)	(1,597)	(2,848)	(3,290)
Interest expense	(18,945)	(19,163)	(37,729)	(38,157)
Less: UJV NOI allocable to COPT included in equity in income of unconsolidated entities	(1,202)	(1,198)	(2,401)	(2,400)
Loss on early extinguishment of debt	0	(513)	0	(513)
Income before gain on sales of real estate	$ 21,108	$ 18,847	$ 39,892	$ 37,349

XML

Information by Business Segment (Details 4) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Reconciliation of segment assets to total assets
Assets	$ 3,612,362	$ 3,595,205	$ 3,592,304
Segment assets
Reconciliation of segment assets to total assets
Assets	3,042,452		2,993,078
Non-operating property assets
Reconciliation of segment assets to total assets
Assets	431,661		452,824
Other assets
Reconciliation of segment assets to total assets
Assets	$ 138,249		$ 146,402

XML

Share-Based Compensation (Details) $ / shares in Units, $ in Thousands			6 Months Ended
	Feb. 22, 2018 shares	Jan. 01, 2018 USD ($) employee Percentile_Rank $ / shares shares	Jun. 30, 2018 USD ($) $ / shares shares
Restricted shares
Share-Based Compensation
Stock awards granted (in shares or units) | shares			196,366
Aggregate grant date fair value | $			$ 5,000
Assumptions used to value stock awards
Weighted average grant date fair value (in dollars per share) | $ / shares			$ 25.38
Other Share-based Compensation Additional Disclosures
Shares vested (in shares) | shares			161,322
Weighted average fair value of shares vested (in dollars per share) | $ / shares			$ 29.72
Aggregate intrinsic value of awards upon vesting | $			$ 4,100
Deferred share awards
Share-Based Compensation
Stock awards granted (in shares or units) | shares			13,832
Aggregate grant date fair value | $			$ 388
Assumptions used to value stock awards
Weighted average grant date fair value (in dollars per share) | $ / shares			$ 28.08
Other Share-based Compensation Additional Disclosures
Shares vested (in shares) | shares			5,515
Weighted average fair value of shares vested (in dollars per share) | $ / shares			$ 29.32
Aggregate intrinsic value of awards upon vesting | $			$ 154
2018 PSU Grants | Performance share units
Share-Based Compensation
Stock awards granted (in shares or units) | shares		59,110
Aggregate grant date fair value | $		$ 1,900
Potential earned PSUs payout for defined levels of performance under awards
Earned PSUs payout (as a percent of PSUs granted) on 75th or greater percentile rank		200.00%
Earned PSUs payout (as a percent of PSUs granted) on 50th percentile rank		100.00%
Earned PSUs payout (as a percent of PSUs granted) on 25th percentile rank		50.00%
Performance share units granted on percentile rank below 25th (as a percent)		0.00%
The number of percentile ranks to fall between to earn interpolated PSUs between such percentile ranks, conditioned on the percentile rank exceeding 25% | Percentile_Rank		2
Assumptions used to value stock awards
Performance period of the award		3 years
Weighted average grant date fair value (in dollars per share) | $ / shares		$ 31.97
Baseline value per common share (in dollars per share) | $ / shares		$ 29.20
Expected volatility of common shares (as a percent)		17.00%
Risk-free interest rate (as a percent)		2.04%
2018 PSU Grants | Performance share units | Executives
Share-Based Compensation
Number of employees affected | employee		3
2015 PSU Grants | Performance share units | Executives
Other Share-based Compensation Additional Disclosures
Shares issued (in shares) | shares	13,328
Percentage of target	75.00%

XML

Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Numerator:
Net income attributable to COPT/COPLP	$ 19,434	$ 17,526	$ 36,584	$ 38,545
'Preferred share/unit dividends/distributions	0	(3,039)	0	(6,219)
Issuance costs associated with redeemed preferred shares/units	0	(6,847)	0	(6,847)
Income attributable to share-based compensation awards	(117)	(117)	(234)	(242)
Numerator for basic and diluted EPS on net income attributable to COPT/COPLP common share/unit holders	$ 19,317	$ 7,523	$ 36,350	$ 25,237
Denominator (all weighted averages):
Denominator for basic EPS/EPU (common shares/units)	101,789	99,036	101,397	98,725
Dilutive effect of share-based compensation awards (shares)	119	160	131	158
Denominator for diluted EPS/EPU (common shares/units)	101,908	99,196	101,528	98,883
Basic EPS:
Net income attributable to COPT/COPLP common shareholders - basic (in dollars per share/unit)	$ 0.19	$ 0.08	$ 0.36	$ 0.26
Diluted EPS:
Net income attributable to COPT/COPLP common shareholders - diluted (in dollars per share/unit)	$ 0.19	$ 0.08	$ 0.36	$ 0.26
Corporate Office Properties, L.P.
Numerator:
Net income attributable to COPT/COPLP	$ 20,207	$ 17,952	$ 38,066	$ 39,758
'Preferred share/unit dividends/distributions	(165)	(3,204)	(330)	(6,549)
Issuance costs associated with redeemed preferred shares/units	0	(6,847)	0	(6,847)
Income attributable to share-based compensation awards	(117)	(117)	(234)	(242)
Numerator for basic and diluted EPS on net income attributable to COPT/COPLP common share/unit holders	$ 19,925	$ 7,784	$ 37,502	$ 26,120
Denominator (all weighted averages):
Denominator for basic EPS/EPU (common shares/units)	104,986	102,441	104,605	102,150
Dilutive effect of share-based compensation awards (shares)	119	160	131	158
Denominator for diluted EPS/EPU (common shares/units)	105,105	102,601	104,736	102,308
Basic EPS:
Net income attributable to COPT/COPLP common shareholders - basic (in dollars per share/unit)	$ 0.19	$ 0.08	$ 0.36	$ 0.26
Diluted EPS:
Net income attributable to COPT/COPLP common shareholders - diluted (in dollars per share/unit)	$ 0.19	$ 0.08	$ 0.36	$ 0.26

XML

Earnings Per Share ("EPS") and Earnings Per Unit ("EPU") (Details 2) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Conversion of common units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	3,197	3,405	3,208	3,425
Conversion of Series I preferred units
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	176	176	176	176
Forward Equity Sale Agreement
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	6,800		7,100
Weighted average restricted stock and deferred shares
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	458	455	451	424
Weighted average options
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	47	61	53	100
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	176	176	176
Corporate Office Properties, L.P. | Forward Equity Sale Agreement
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	6,800		7,100
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)	458	455	451	424
Corporate Office Properties, L.P. | Weighted average options
Antidilutive securities
Antidilutive securities excluded from computation of diluted earnings per share (in shares)	47	61	53	100

XML

Commitments and Contingencies - Narrative (Details)	May 25, 2017 USD ($)	Jun. 30, 2018 USD ($) Property	Dec. 31, 2017 USD ($)	Aug. 31, 2010 USD ($)
Capital Leases
Capital lease term	99 years
Purchase option	$ 1
Capital lease obligation	$ 16,100,000	$ 640,000	$ 15,853,000
Environmental Indemnity Agreement
Number of properties which were provided environmental indemnifications | Property		3
Maximum additional costs agreed to be paid by the entity under environmental indemnification agreement		$ 19,000,000
New Development and Redevelopment Obligations
Capital Leases
Purchase obligations		89,400,000
Capital Expenditures For Operating Properties
Capital Leases
Purchase obligations		41,500,000
Third Party Construction
Capital Leases
Purchase obligations		4,500,000
Other Obligations
Capital Leases
Purchase obligations		$ 2,400,000
Specialty Tax Guarantee | Anne Arundel County, Maryland | Tax Incremental Financing Bond
Loss Contingencies [Line Items]
Loan amount				$ 30,000,000

XML

Commitments and Contingencies - Operating Leases Future Minimum Payments (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
2018	$ 644
2019	1,277
2020	1,270
2021	1,274
2022	1,158
Thereafter	84,611
Total	$ 90,234

XML

Commitments and Contingencies - Capital Leases Future Minimum Payments (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Minimum rental payments due in 2020	$ 660
Less: Amount representing interest	(20)
Capital lease obligation	$ 640

XML

Label	Element	Value
Subsidiaries [Member]
Restricted Cash	us-gaap_RestrictedCash	$ 2,756,000
Restricted Cash	us-gaap_RestrictedCash	2,721,000
Restricted Cash	us-gaap_RestrictedCash	2,570,000
Restricted Cash	us-gaap_RestrictedCash	$ 4,105,000