First Potomac Realty Trust (FPO) 10-Q 29 Jul 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	6 Months Ended
	Jun. 30, 2016shares
Document And Entity Information [Abstract]
Entity Registrant Name	FIRST POTOMAC REALTY TRUST
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Entity Central Index Key	1,254,595
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding	58,129,464

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016		Dec. 31, 2015
Assets:
Rental property, net	$ 1,085,108		$ 1,130,266
Assets held-for-sale	55,144		90,674
Cash and cash equivalents	13,703		13,527
Escrows and reserves	2,220		2,514
Accounts and other receivables, net of allowance for doubtful accounts of $908 and $876, respectively	6,377		9,868
Accrued straight-line rents, net of allowance for doubtful accounts of $316 and $105, respectively	39,482		36,888
Notes receivable	0		34,000
Investment in affiliates	48,715		48,223
Deferred costs, net	36,416		36,537
Prepaid expenses and other assets	4,608		6,950
Intangible assets, net	28,273		32,959
Total assets	1,320,046	[1]	1,442,406
Liabilities:
Mortgage loans, net	309,879		307,769
Unsecured term loan, net	299,339		299,404
Unsecured revolving credit facility, net	144,159		116,865
Disposal Group, Including Discontinued Operation, Liabilities	24,493		1,513
Accounts payable and other liabilities	38,041		47,972
Accrued interest	1,448		1,603
Rents received in advance	6,780		6,003
Tenant security deposits	5,080		4,982
Deferred market rent, net	1,966		2,154
Total liabilities	831,185		788,265
Noncontrolling interests in the Operating Partnership	26,290		28,813
Equity:
Common shares, $0.001 par value per share, 150,000 shares authorized; 58,129 and 57,718 shares issued and outstanding, respectively	58		58
Additional paid-in capital	914,311		907,220
Noncontrolling interests in a consolidated partnership	690		800
Accumulated other comprehensive loss	(2,992)		(2,360)
Dividends in excess of accumulated earnings	(464,496)		(440,390)
Total equity	462,571		625,328
Total liabilities, noncontrolling interests and equity	1,320,046		1,442,406
Series A Preferred Shares
Equity:
7.750% Series A Preferred Shares, $25 per share liquidation preference, 600 and 6,400 shares issued and outstanding, respectively	$ 15,000		$ 160,000
[1]	Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6, Investment in Affiliates. Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015, respectively.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement of Financial Position [Abstract]
Allowance for doubtful accounts, accounts and other receivables	$ 908	$ 876
Allowance for doubtful accounts, accrued straight-line rents	$ 316	$ 105
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	50,000,000	50,000,000
Series A Preferred Shares liquidation preference	$ 25	$ 25
Series A Preferred Shares, shares issued	600,000	6,400,000
Series A Preferred Shares, shares outstanding	600,000	6,400,000
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	58,129,000	57,718,000
Common stock, shares outstanding	58,129,000	57,718,000

Consolidated Statements of Oper

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Revenues:
Rental	$ 31,554	$ 34,844	$ 65,398	$ 69,224
Tenant reimbursements and other	6,939	8,195	15,792	17,664
Total revenues	38,493	43,039	81,190	86,888
Operating expenses:
Property operating	8,543	10,661	20,080	23,775
Real estate taxes and insurance	4,920	4,811	10,136	9,854
General and administrative	4,305	4,979	8,884	10,505
Depreciation and amortization	15,141	16,817	30,147	33,151
Impairment of rental property	2,772	0	2,772	0
Total operating expenses	35,681	37,268	72,019	77,285
Operating income	2,812	5,771	9,171	9,603
Other expenses (income)
Interest expense	6,568	6,725	13,384	13,633
Interest and other income	(1,101)	(974)	(2,104)	(4,802)
Equity in earnings of affiliates	(663)	(456)	(1,219)	(803)
Loss on sale of rental property	0	0	1,155	0
Loss on debt extinguishment	0	0	48	0
Total other expenses (income)	4,804	5,295	11,264	8,028
(Loss) income from continuing operations	(1,992)	476	(2,093)	1,575
Discontinued operations:
Loss from operations	0	0	0	(975)
Loss on debt extinguishment	0	0	0	(489)
Gain on sale of rental property	0	0	0	857
Loss from discontinued operations	0	0	0	(607)
Net (loss) income	(1,992)	476	(2,093)	968
Less: Net loss attributable to noncontrolling interests	(390)	(114)	(537)	(227)
Net (loss) income attributable to First Potomac Realty Trust	(1,602)	590	(1,556)	1,195
Less: Dividends on preferred shares	(794)	(3,100)	(3,042)	(6,200)
Less: Issuance costs of redeemed preferred shares	(3,095)	0	(4,999)	0
Net loss attributable to common shareholders	$ (5,491)	$ (2,510)	$ (9,597)	$ (5,005)
Basic and diluted earnings per common share:
Loss from continuing operations attributable to common shareholders	$ (0.10)	$ (0.04)	$ (0.17)	$ (0.08)
Loss from discontinued operations attributable to common shareholders	0	0	0	(0.01)
Net loss attributable to common shareholders	$ (0.10)	$ (0.04)	$ (0.17)	$ (0.09)
Weighted average common shares outstanding:
Basic and diluted	57,577	58,280	57,559	58,241

Consolidated Statements of Comp

Consolidated Statements of Comprehensive (Loss) Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (1,992)	$ 476	$ (2,093)	$ 968
Unrealized gain on derivative instruments	350	748	505	397
Unrealized loss on derivative instruments	(148)	0	(1,165)	(725)
Total comprehensive (loss) income	(1,790)	1,224	(2,753)	640
Net loss attributable to noncontrolling interests	390	114	537	227
Less: Net loss from continuing operations attributable to noncontrolling interests	(390)	(114)	(537)	(201)
Net (gain) loss from derivative instruments attributable to noncontrolling interests	(9)	(32)	28	14
Comprehensive (loss) income attributable to First Potomac Realty Trust	$ (1,409)	$ 1,306	$ (2,188)	$ 881

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from operating activities:
Net (loss) income	$ (2,093)	$ 968
Discontinued operations:
Gain on sale of rental property	0	(857)
Depreciation and amortization	0	1,222
Depreciation and amortization	30,713	33,693
Stock based compensation	994	1,531
Bad debt expense	371	394
Amortization of deferred market rent	155	77
Amortization of financing costs and discounts	791	665
Equity in earnings of affiliates	(1,219)	(803)
Distributions from investments in affiliates	726	632
Gain (Loss) on Sale of Properties	1,155	0
Impairment of rental property	2,772	0
Changes in assets and liabilities:
Escrows and reserves	73	281
Accounts and other receivables	3,166	(1,555)
Accrued straight-line rents	(2,953)	(4,583)
Prepaid expenses and other assets	1,604	1,051
Tenant security deposits	(650)	(509)
Accounts payable and accrued expenses	(1,211)	2,123
Accrued interest	(102)	(63)
Rents received in advance	238	(1,330)
Deferred costs	(2,651)	(4,833)
Total adjustments	33,972	27,136
Net cash provided by operating activities	31,879	28,104
Cash flows from investing activities:
Proceeds from sale of rental property	90,501	56,943
Principal payments from note receivable	34,000	29,720
Change In Escrow And Reserves	221	176
Additions to rental property and furniture, fixtures and equipment	(30,953)	(23,760)
Additions to construction in progress	(10,586)	(7,565)
Payments to Acquire Equity Method Investments	0	(405)
Net cash provided by investing activities	83,183	55,109
Cash flows from financing activities:
Financing costs	(309)	(108)
Issuance of debt	201,408	26,000
Repayments of debt	(151,036)	(84,883)
Dividends to common shareholders	(14,511)	(17,611)
Dividends to preferred shareholders	(4,442)	(6,200)
Payments of Distributions to Affiliates	0	(96)
Distributions to noncontrolling interests	(651)	(788)
Redemption of preferred shares	(145,000)	0
Redemption of operating partnership units	(345)	(134)
Proceeds from stock option exercises	0	19
Net cash used in financing activities	(114,886)	(83,801)
Net increase (decrease) in cash and cash equivalents	176	(588)
Cash and cash equivalents, beginning of period	13,527
Cash and cash equivalents, end of period	13,703	12,735
Cash paid for interest, net	12,432	12,877
Non-cash investing and financing activities:
Value of common shares retired to settle employee income tax obligations	137	454
Change in fair value of the outstanding common Operating Partnership units	(1,072)	(1,783)
Changes in accruals:
Additions to rental property and furniture, fixtures and equipment	1,049	967
Additions to development and redevelopment	$ 4,853	$ (3,266)

Consolidated Statements of Cas7

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Capitalized interest on indebtedness paid in cash	$ (500)	$ (900)
Surrendered common shares to satisfy statutory minimum federal income tax obligations	137	454
Fair value adjustment, cost basis	3,200
Change in redemption value, noncontrolling interest		3,000
Furniture and Fixtures [Member]
Accrued capital expenditure	8,800	8,300
Development and Redevelopment [Member]
Accrued capital expenditure	$ 900	$ 4,600

Description of Business

Description of Business	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Description of Business	Description of Business First Potomac Realty Trust (the “Company”) is a leader in the ownership, management, redevelopment and development of office and business park properties in the greater Washington, D.C. region. The Company’s focus is owning and operating properties that the Company believes can benefit from its market knowledge and intensive operational skills with a focus on increasing their profitability and value. The Company’s portfolio primarily contains a mix of multi-tenant and single-tenant office properties and business parks. Office properties are single-story and multi-story buildings that are primarily for office use; and business parks contain buildings with office features combined with some industrial property space. The Company separates its properties into four distinct reporting segments, which the Company refers to as the Washington, D.C., Maryland, Northern Virginia and Southern Virginia reporting segments. References in these unaudited condensed consolidated financial statements to “we,” “our,” “us,” the “Company” or “First Potomac,” refer to the Company and its subsidiaries, on a consolidated basis, unless the context indicates otherwise. We conduct our business through our Operating Partnership. We are the sole general partner of, and, as of June 30, 2016 , owned 100% of the preferred interest and 95.8% of the common interest in the Operating Partnership. The remaining common interests in the Operating Partnership, which are presented as noncontrolling interests in the Operating Partnership in the accompanying unaudited condensed consolidated financial statements, are limited partnership interests that are owned by unrelated parties. At June 30, 2016 , we wholly owned or had a controlling interest in properties totaling 6.5 million square feet and had a noncontrolling ownership interest in properties totaling an additional 0.9 million square feet through five unconsolidated joint ventures. We also owned land that can support 1.3 million square feet of additional development, including 0.7 million square feet related to Storey Park, which was classified as held-for-sale on our consolidated balance sheet at June 30, 2016 and was sold on July 25, 2016 . Our consolidated properties were 93.1% occupied by 385 tenants at June 30, 2016 . We did not include square footage that was in development or redevelopment, which totaled 0.2 million square feet at June 30, 2016 , in our occupancy calculation. We derive substantially all of our revenue from leases of space within our properties. As of June 30, 2016 , our largest tenant was the U.S. Government, which accounted for 12.5% of our total annualized cash basis rent, and the U.S. Government combined with government contractors accounted for 24.2% of our total annualized cash basis rent as of June 30, 2016 . We operate so as to qualify as a real estate investment trust (“REIT”) for federal income tax purposes.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies (a) Principles of Consolidation Our unaudited condensed consolidated financial statements include our accounts and the accounts of our Operating Partnership, which we consider to be a variable interest entity (“VIE”), and the subsidiaries in which we or our Operating Partnership has a controlling interest, which includes First Potomac Management, LLC, a wholly-owned subsidiary that manages the majority of our properties. All intercompany balances and transactions have been eliminated in consolidation. We have condensed or omitted certain information and note disclosures normally included in financial statements presented in accordance with U.S. generally accepted accounting principles (“GAAP”) in the accompanying unaudited condensed consolidated financial statements. We believe the disclosures made are adequate to prevent the information presented from being misleading. However, the unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in our annual report on Form 10-K for the year ended December 31, 2015 and as updated from time to time in our other filings with the SEC. In our opinion, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, consisting of normal recurring adjustments and accruals necessary to present fairly our financial position as of June 30, 2016 and the results of our operations, our comprehensive loss and our cash flows for the three and six months ended June 30, 2016 and 2015 . Interim results are not necessarily indicative of full-year performance due, in part, to the timing of transactions and the impact of acquisitions and dispositions throughout the year, as well as the seasonality of certain operating expenses such as utilities expense and snow and ice removal costs. (b) Use of Estimates The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires our management team to make a number of estimates and assumptions relating to the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenues and expenses during the period. Estimates include the amount of accounts receivable that may be uncollectible, future cash flows, discount and capitalization rate assumptions used to fair value acquired properties and to test impairment of certain long-lived assets and goodwill, derivative valuations, market lease rates, lease-up periods, leasing and tenant improvement costs used to fair value intangible assets acquired and probability weighted cash flow analysis used to fair value contingent liabilities. Actual results could differ from those estimates. (c) Rental Property Rental property is initially recorded at fair value, when acquired in a business combination, or initial cost when constructed or acquired in an asset purchase. Improvements and replacements are capitalized at cost when they extend the useful life, increase capacity or improve the efficiency of the asset. Repairs and maintenance are charged to expense when incurred. Depreciation and amortization are recorded on a straight-line basis over the estimated useful lives of the assets. The estimated useful lives of our assets, by class, are as follows: Buildings 39 years Building improvements 5 to 20 years Furniture, fixtures and equipment 5 to 15 years Lease related intangible assets The term of the lease Tenant improvements Shorter of the useful life of the asset or the term of the related lease We regularly review market conditions for possible impairment of a property’s carrying value. When circumstances such as adverse market conditions, changes in management’s intended holding period or potential sale to a third party indicate a possible impairment of the carrying value of a property, an impairment analysis is performed. We assess potential impairments based on an estimate of the future undiscounted cash flows (excluding interest charges) expected to result from the property’s use and eventual disposition. This estimate is based on projections of future revenues, expenses, capital improvement costs to maintain the operating capacity, expected holding periods and capitalization rates. These cash flows consider factors such as expected market trends and leasing prospects, as well as the effects of leasing demand, competition and other factors. If impairment exists due to the inability to recover the carrying value of a real estate investment based on forecasted undiscounted cash flows, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair value of the property. Further, we will record an impairment loss if we expect to dispose of a property in the near term, at a price below carrying value. In such an event, we will record an impairment loss based on the difference between a property’s carrying value and its projected sales price less any estimated costs to sell. We will classify a building as held-for-sale in accordance with GAAP in the period in which we have made the decision to dispose of the building, our Board of Trustees or a designated delegate has approved the sale, there is a binding contract pursuant to which the buyer has significant money at risk, or high likelihood a binding agreement to purchase the property will be signed under which the buyer will be required to commit a significant amount of nonrefundable cash, and no significant financing contingencies exist that could cause the transaction not to be completed in a timely manner. We will cease recording depreciation on a building once it has been classified as held-for-sale. We will also determine whether the disposal of a building qualifies as a discontinued operation in accordance with GAAP by assessing whether the disposal of the building, or group of buildings, represents a strategic shift that has, or will have, a major effect on the Company’s operations or financial results. If the building does not qualify as a discontinued operation in accordance with GAAP, we will classify the building’s operating results, together with any impairment charges and any gains or losses on the sale of the building, in continuing operations for all periods presented in our consolidated statements of operations. We will classify the assets and liabilities related to the building as held-for-sale in our consolidated balance sheet for the period the held-for-sale criteria were met. If the building does qualify as a discontinued operation under GAAP, we will classify the building’s operating results, together with any impairment charges and any gains or losses on the sale of the building, in discontinued operations in our consolidated statements of operations for all periods presented and classify the assets and liabilities related to the building as held-for-sale in our consolidated balance sheets for the periods presented. Interest expense is reclassified to discontinued operations only to the extent the disposed or held-for-sale property is secured by specific mortgage debt and the mortgage debt will not be assigned to another property owned by us after the disposition. We recognize the fair value, if sufficient information exists to reasonably estimate the fair value, of any liability for conditional asset retirement obligations when assumed or incurred, which is generally upon acquisition, construction, development or redevelopment and/or through the normal operation of the asset. We capitalize interest costs incurred on qualifying expenditures for real estate assets under development or redevelopment, which include our investments in assets owned through unconsolidated joint ventures that are under development or redevelopment, while being readied for their intended use in accordance with accounting requirements regarding capitalization of interest. We will capitalize interest when qualifying expenditures for the asset have been made, activities necessary to get the asset ready for its intended use are in progress and interest costs are being incurred. Capitalized interest also includes interest associated with expenditures incurred to acquire developable land while development activities are in progress. We also capitalize direct compensation costs of our construction personnel who manage the development and redevelopment projects, but only to the extent the employee’s time can be allocated to a project. Any portion of construction management costs not directly attributable to a specific project are recognized as general and administrative expense in the period incurred. We do not capitalize any other general and administrative costs such as office supplies, office rent expense or an overhead allocation to our development or redevelopment projects. Capitalized compensation costs were immaterial for the three and six months ended June 30, 2016 and 2015 . Capitalization of interest ends when the asset is substantially complete and ready for its intended use, but no later than one year from completion of major construction activity, if the property is not occupied. We place redevelopment and development assets into service at this time and commence depreciation upon the substantial completion of tenant improvements and the recognition of revenue. Capitalized interest is depreciated over the useful life of the underlying assets, commencing when those assets are placed into service. (d) Notes Receivable We provide loans to the owners of real estate properties, which can be collateralized by interest in the real estate property. We record these loans as “Notes receivable” in our consolidated balance sheets. The loans will be recorded net of any discount or issuance costs, which will be amortized over the life of the respective note receivable using the effective interest method. We record interest earned from notes receivable and amortization of any discount costs or issuance costs within “Interest and other income” in our consolidated statements of operations. We will establish a provision for anticipated credit losses associated with our notes receivable when we anticipate that we may be unable to collect any contractually due amounts. This determination is based upon such factors as delinquencies, loss experience, collateral quality and current economic or borrower conditions. Our collectability of our notes receivable may be adversely impacted by the financial stability of the Washington, D.C. region and the ability of the underlying assets to keep current tenants or attract new tenants. Estimated losses are recorded as a charge to earnings to establish an allowance for credit losses that we estimate to be adequate based on these factors. During the second quarter of 2016, we received the full repayment of a mezzanine loan with an outstanding principal balance of $34.0 million . We did not have any notes receivable outstanding at June 30, 2016. Based on the review of the above criteria, we did not record an allowance for credit losses for our notes receivable during the six months ended June 30, 2015 . (e) Application of New Accounting Standards In January 2016, we adopted Accounting Standards Update No. 2015-01, Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items (“ASU 2015-01”), which eliminates the concept of extraordinary items from GAAP and the requirement that an entity separately report extraordinary items in the income statement. ASU 2015-01 also requires that entities continue to evaluate whether items are unusual in nature or infrequent in occurrence for presentation and disclosure purposes. The adoption of ASU 2015-01 did not have a material impact on our unaudited condensed consolidated financial statements and related disclosures. In January 2016, we adopted ASU No. 2015-02, Amendments to the Consolidation Analysis (“ASU 2015-02”). This standard amends certain guidance applicable to the consolidation of various legal entities, including variable interest entities (“VIE”). In determining the method of accounting for partially owned joint ventures, we evaluate the characteristics of associated entities and determine whether an entity is a VIE and, if so, determine which party is the primary beneficiary by analyzing whether we have both the power to direct the entity's significant economic activities and the obligation to absorb potentially significant losses or receive potentially significant benefits. Significant judgments and assumptions inherent in this analysis include the nature of the entity's operations, the entity's financing and capital structure, and contractual relationship and terms, including consideration of governance and decision making rights. We consolidate a VIE when we have determined that we are the primary beneficiary. We evaluated the application of ASU 2015-02 and concluded that no change was required to our accounting for any of our interests in less than wholly owned joint ventures. We continued to consolidate our joint venture in Storey Park, which was sold on July 25, 2016, as described in note 12(b), Noncontrolling Interests in a Consolidated Partnership , as it continued to meet the definition and certain criteria as a VIE in which we were considered to be the primary beneficiary. Under ASU 2015-02, our Operating Partnership now meets the definition of a VIE, we are the primary beneficiary, and, accordingly, we continue to consolidate the Operating Partnership. Our sole significant asset is our investment in the Operating Partnership and, consequently, substantially all of our assets and liabilities represent assets and liabilities of the Operating Partnership. All of our debt is an obligation of the Operating Partnership and may only be settled with the assets of the Operating Partnership. In January 2016, we adopted Accounting Standards Update No. 2015-03, Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”), which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the debt liability. ASU 2015-03 is applied on a retrospective basis, which resulted in the reclassification of our debt issuance costs from previously presented balances. The guidance did not have a material impact on our unaudited condensed consolidated financial statements and related disclosures. In January 2016, we adopted Accounting Standards Update No. 2015-16, Simplifying the Accounting for Measurement-Period Adjustments (“ASU 2015-16”), which eliminates the requirement for an acquirer to retrospectively adjust the financial statements for measurement-period adjustments that occur in periods after the acquisition of a business combination. The acquirer would instead recognize measurement-period adjustments in the reporting period in which the adjustment is identified. The adoption of ASU 2015-16 did not have a material impact on our unaudited condensed consolidated financial statements and related disclosures. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers and will replace most existing revenue recognition guidance when it becomes effective. In July 2015, the FASB deferred by one year the mandatory effective date of ASU 2014-09 from January 1, 2017 to January 1, 2018. Early adoption is permitted, but not prior to the original effective date of January 1, 2017. ASU 2014-09 permits the use of either the retrospective or cumulative effect transition method. We have not yet selected a transition method and are evaluating the impact that ASU 2014-09 will have on our consolidated financial statements and related disclosures. In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (“ASU 2014-15”), which requires an entity to evaluate whether conditions or events, in the aggregate, raise substantial doubt about the entity’s ability to continue as a going concern for one year from the date the financial statements are issued or are available to be issued. The guidance will become effective for annual periods ending after December 15, 2016. The adoption of ASU 2014-15 is not expected to have an impact on our consolidated financial statements and related disclosures. In January 2016, the FASB issued Accounting Standards Update No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”), which requires, among other things, entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value disclosed for financial instruments measured at amortized cost on the balance sheet. ASU 2016-01 is effective for periods beginning after December 15, 2017; early adoption is not permitted. The guidance is not expected to have a material impact on our consolidated financial statements and related disclosures. In February 2016, the FASB issued Accounting Standards Update No. 2016-02 (“ASU 2016-02”), Leases , which requires a lessee to record on the balance sheet a right-of-use asset with a corresponding lease liability created by lease terms of more than 12 months. Additional qualitative and quantitative disclosures will also be required. The guidance will become effective for periods beginning after December 15, 2018 and will be applied using a modified retrospective transition method. We are currently evaluating the impact that ASU 2016-02 will have on our consolidated financial statements and related disclosures. In March 2016, the FASB issued Accounting Standards Update No. 2016-09 (“ASU 2016-09”), Improvements to Employee Share-Based Payment Accounting, which is intended to simplify several aspects of the accounting for employee share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance will become effective for periods beginning after December 15, 2016 and early adoption is permitted. ASU 2016-09 permits the use of the cumulative-effect and prospective methods. While we are currently evaluating the impact of this standard and whether we will elect to early adopt the standard, we do not believe this standard will have a material impact on our consolidated financial statements or related disclosures. (f) Reclassifications Certain prior year asset and debt balances have been reclassified to conform to the current year presentation as a result of adopting ASU 2015-03 in January 2016, which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the debt liability and which is applied on a retrospective basis. See note 2(e), Summary of Significant Accounting Policies - Application of New Accounting Standards for more information.

Earnings Per Common Share

Earnings Per Common Share	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Earnings Per Common Share	Earnings Per Common Share Basic earnings or loss per common share (“EPS”) is calculated by dividing net income or loss attributable to common shareholders by the weighted average common shares outstanding for the periods presented. Diluted EPS is computed after adjusting the basic EPS computation for the effect of dilutive common equivalent shares outstanding during the periods presented, which include stock options and non-vested shares. We apply the two-class method for determining EPS as our outstanding unvested shares with non-forfeitable dividend rights are considered participating securities. Our excess of distributions over earnings related to participating securities is shown as a reduction in total earnings attributable to common shareholders in our computation of EPS. The following table sets forth the computation of our basic and diluted earnings per common share (dollars in thousands, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Numerator for basic and diluted earnings per common share: (Loss) income from continuing operations $ (1,992 ) $ 476 $ (2,093 ) $ 1,575 Loss from discontinued operations — — — (607 ) Net (loss) income (1,992 ) 476 (2,093 ) 968 Less: Net loss from continuing operations attributable to noncontrolling interests 390 114 537 201 Less: Net loss from discontinued operations attributable to noncontrolling interests — — — 26 Net (loss) income attributable to First Potomac Realty Trust (1,602 ) 590 (1,556 ) 1,195 Less: Dividends on preferred shares (794 ) (3,100 ) (3,042 ) (6,200 ) Less: Issuance costs of redeemed preferred shares (1) (3,095 ) — (4,999 ) — Net loss attributable to common shareholders (5,491 ) (2,510 ) (9,597 ) (5,005 ) Less: Allocation to participating securities (53 ) (69 ) (126 ) (142 ) Net loss attributable to common shareholders $ (5,544 ) $ (2,579 ) $ (9,723 ) $ (5,147 ) Denominator for basic and diluted earnings per common share: Weighted average common shares outstanding: Basic and diluted 57,577 58,280 57,559 58,241 Basic and diluted earnings per common share: Loss from continuing operations attributable to common shareholders $ (0.10 ) $ (0.04 ) $ (0.17 ) $ (0.08 ) Loss from discontinued operations attributable to common shareholders — — — (0.01 ) Net loss attributable to common shareholders $ (0.10 ) $ (0.04 ) $ (0.17 ) $ (0.09 ) (1) Represents the original issuance costs associated with the redemption of 3.6 million and 5.8 million 7.750% Series A Cumulative Redeemable Perpetual Preferred Shares during the three and six months ended June 30, 2016, respectively. In accordance with GAAP regarding earnings per common share, we did not include the following potential weighted average common shares in our calculation of diluted earnings per common share as they are anti-dilutive for the periods presented (amounts in thousands): Three Months Ended Six Months Ended 2016 2015 2016 2015 Stock option awards 982 1,046 1,000 1,069 Non-vested share awards 489 405 505 450 1,471 1,451 1,505 1,519

Rental Property

Rental Property	6 Months Ended
	Jun. 30, 2016
Real Estate [Abstract]
Rental Property	Rental Property Rental property represents buildings and related improvements, net of accumulated depreciation, and developable land that are wholly owned or owned by an entity in which we have a controlling interest. All of our rental properties are located within the greater Washington, D.C. region. Rental property consists of the following (dollars in thousands): June 30, 2016 (1) December 31, 2015 (2) Land and land improvements $ 279,163 $ 280,149 Buildings and improvements 800,647 793,184 Construction in progress 45,085 97,361 Tenant improvements 191,654 168,946 Furniture, fixtures and equipment 398 410 1,316,947 1,340,050 Less: accumulated depreciation (231,839 ) (209,784 ) $ 1,085,108 $ 1,130,266 (1) Excludes rental property totaling $55.1 million at June 30, 2016 related to Storey Park, which was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016 . (2) Excludes rental property totaling $90.6 million at December 31, 2015 related to the NOVA Non-Core Portfolio (as defined in note 7, Dispositions ), which was classified as held-for-sale at December 31, 2015 and was sold on March 25, 2016 . Development and Redevelopment Activity We will place completed development and redevelopment assets in-service upon the earlier of one year after major construction activity is deemed to be substantially complete or upon occupancy. We construct office buildings and/or business parks on a build-to-suit basis or with the intent to lease upon completion of construction. At June 30, 2016, we owned developable land that can accommodate 1.3 million square feet of additional building space, of which 0.7 million is located in the Washington, D.C. reporting segment, 0.1 million in the Maryland reporting segment, 0.4 million in the Northern Virginia reporting segment and 0.1 million in the Southern Virginia reporting segment. The 0.7 million square feet of developable land in the Washington, D.C. reporting segment primarily relates to Storey Park, which was sold on July 25, 2016 . During the third quarter of 2014, we signed a lease for 167,000 square feet at a to-be-constructed building (the “NOVA build-to-suit”) in our Northern Virginia reporting segment on vacant land that we had in our portfolio. We substantially completed construction of the new building in March 2016 and expect to complete the construction of the tenant improvements in the third quarter of 2016. At June 30, 2016, none of the completed development space was placed in-service. Our total investment in the development project, excluding tenant improvements and leasing commission costs, was $34.6 million as of June 30, 2016, which related to the completion of the building and included the original cost basis of the applicable portion of the vacant land of $5.2 million . On August 4, 2011, we formed a joint venture, in which we have a 97% interest, with an affiliate of Perseus Realty, LLC to acquire Storey Park in our Washington, D.C. reporting segment. At the time, the site was leased to Greyhound Lines, Inc. (“Greyhound”), which subsequently relocated its operations. Greyhound’s lease expired on August 31, 2013 , at which time the property was placed into development with the anticipation of developing a mixed-use project on the 1.6 acre site, which can accommodate up to 712,000 square feet. On July 25, 2016 , our consolidated joint venture sold Storey Park for a contractual purchase price of $54.5 million , which generated net proceeds of $52.7 million . In June 2016, we recorded a $2.8 million impairment charge based on the sales price, less estimated selling costs. On January 1, 2016, we ceased capitalizing expenses associated with the development project as we began marketing the property for sale. During the second quarter of 2016 , we did no t place in-service any completed development or redevelopment space. At June 30, 2016 , other than the new building at the NOVA build-to-suit, we had no completed development or redevelopment space that had yet to be placed in-service.

Notes Receivable

Notes Receivable	6 Months Ended
	Jun. 30, 2016
Receivables [Abstract]
Notes Receivable	Notes Receivable On June 2, 2016, the owners of 950 F Street, NW, a ten-story, 287,000 square-foot office/retail building located in Washington, D.C., prepaid a mezzanine loan that was secured by a portion of the owners’ interest in the property and had an outstanding balance of $34.0 million . The loan required monthly interest-only payments and had a fixed interest rate of 9.75% . The mezzanine loan was scheduled to mature on April 1, 2017 and had been prepayable since December 21, 2015. In addition to the prepayment of the loan's entire principal balance, we received interest through June 24, 2016 and an exit fee upon the loan's prepayment. We recognized $0.2 million of accelerated income in the second quarter of 2016 related to the payment of the exit fee, which is reflected in “Interest and other income” on our consolidated statement of operations for the three and six months ended June 30, 2016. We used the proceeds from the prepayment of the note receivable to redeem the outstanding 0.6 million 7.750% Series A Cumulative Redeemable Perpetual Preferred Shares (the “7.750% Series A Preferred Shares”) and to pay down a portion of our unsecured revolving credit facility. On February 24, 2015, the owners of America’s Square, a 461,000 square foot office complex located in Washington, D.C., prepaid a mezzanine loan that had an outstanding balance of $29.7 million . The loan had a fixed-interest rate of 9.0% and was scheduled to mature on May 1, 2016 . We received a yield maintenance payment of $2.4 million with the prepayment of the loan, which is reflected within “Interest and other income” on our consolidated statement of operations for the six months ended June 30, 2015. We recorded interest income related to our notes receivable of $0.8 million and $1.6 million for the three and six months ended June 30, 2016 , respectively, and $0.8 million and $2.0 million for the three and six months ended June 30, 2015 , respectively, which is included within “Interest and other income” on our consolidated statements of operations.

Investment in Affiliates

Investment in Affiliates	6 Months Ended
	Jun. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Investment in Affiliates	Investment in Affiliates We own an interest in several joint ventures that own properties. We do not control the activities that are most significant to the joint ventures. As a result, the assets, the liabilities and the operating results of these noncontrolled joint ventures are not consolidated within our unaudited condensed consolidated financial statements. Our investments in these joint ventures are recorded as “Investment in affiliates” on our consolidated balance sheets. Our investment in affiliates consisted of the following (dollars in thousands): Reporting Segment Ownership Investment at June 30, 2016 Investment at December 31, 2015 Prosperity Metro Plaza Northern Virginia 51% $ 25,678 $ 24,909 1750 H Street, NW Washington, D.C. 50% 14,870 15,168 Aviation Business Park Maryland 50% 5,847 5,899 Rivers Park I and II (1) Maryland 25% 2,320 2,247 $ 48,715 $ 48,223 (1) Rivers Park I and Rivers Park II are owned through two separate joint ventures. The following table provides a summary of the mortgage debt held by our unconsolidated joint ventures (dollars in thousands): FPO Ownership Effective Interest Rate Maturity Date Principal Balance at June 30, 2016 (1) Principal Balance at December 31, 2015 (1) Rivers Park I and II (2) 25% LIBOR + 1.90% (3) September 2017 $ 28,000 $ 28,000 1750 H Street, NW (4) 50% 3.92% August 2024 32,000 32,000 Prosperity Metro Plaza (5) 51% 3.91% December 2029 50,000 50,000 Weighted Average / Total 3.52% $ 110,000 $ 110,000 (1) Reflects the entire balance of the debt secured by the properties, not our portion of the debt. (2) The loan is repayable in full, without penalty, at any time during the term of the loan. Of the outstanding principal balance, $2.8 million is recourse to us. We believe the fair value of the potential liability to us related to the recourse debt is inconsequential as the likelihood of our need to perform under the debt agreement is remote. (3) At June 30, 2016 , LIBOR was 0.47% . All references to LIBOR in the condensed consolidated financial statements refer to one-month LIBOR. (4) The loan requires interest-only payments with a constant interest rate over the life of the loan. The loan is repayable in full, without penalty, on or after August 1, 2021. (5) The loan requires interest-only payments through December 2024, at which time the loan requires principal and interest payments through its maturity date. The loan is repayable in full without penalty on or after June 1, 2029. The net assets of our unconsolidated joint ventures consisted of the following (dollars in thousands): June 30, 2016 December 31, 2015 Assets: Rental property, net $ 191,068 $ 193,243 Cash and cash equivalents 7,493 5,992 Other assets 17,775 16,490 Total assets 216,336 215,725 Liabilities: Mortgage loans, net (1)(2) 109,322 109,273 Other liabilities 6,665 7,214 Total liabilities 115,987 116,487 Net assets $ 100,349 $ 99,238 (1) Of the total mortgage debt that encumbers our unconsolidated properties, $2.8 million is recourse to us. We believe the fair value of the potential liability to us under this guaranty is inconsequential as the likelihood of our need to perform under the debt agreement is remote. (2) In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented on the balance sheet as a direct deduction from the carrying value of the respective debt liability and which is applied on a retrospective basis. Mortgage loans, net at both June 30, 2016 and December 31, 2015 included $0.7 million of unamortized deferred financing costs. Our share of earnings or losses related to our unconsolidated joint ventures is recorded in our consolidated statements of operations as “Equity in earnings of affiliates.” The following table summarizes the results of operations of our unconsolidated joint ventures for the periods presented, which, due to our varying ownership interests in the joint ventures and the varying operations of the joint ventures, may not be reflective of the amounts recorded in our consolidated statements of operations (dollars in thousands): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Total revenues $ 6,240 $ 6,063 $ 12,529 $ 12,230 Total operating expenses (1,814 ) (1,756 ) (3,980 ) (3,912 ) Net operating income 4,426 4,307 8,549 8,318 Depreciation and amortization (2,006 ) (2,287 ) (3,972 ) (4,536 ) Interest expense, net (997 ) (975 ) (1,989 ) (1,948 ) Net income $ 1,423 $ 1,045 $ 2,588 $ 1,834 We earn various fees from several of our joint ventures, which include management fees, leasing commissions and construction management fees. We recognize fees only to the extent of the third party ownership interest in our unconsolidated joint ventures. We recognized fees from our unconsolidated joint ventures of $0.2 million and $0.4 million for the three and six months ended June 30, 2016 , respectively, and $0.2 million and $0.3 million for the three and six months ended June 30, 2015, respectively, which are reflected within “Tenant reimbursements and other revenues” on our consolidated statements of operations.

Dispositions

Dispositions	6 Months Ended
	Jun. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Dispositions	Dispositions We will report a disposed or held-for-sale property or group of properties in discontinued operations only if the disposal represents a strategic shift that has, or will have, a major effect on our operations and financial results. All other disposed properties will have their operating results reflected within continuing operations on our consolidated statements of operations for all periods presented. We have had, and will have, no continuing involvement with any of our disposed properties subsequent to their disposal. The operations of the disposed properties were not subject to any income based taxes. Other than the properties discussed below in this note 7 , Dispositions , we did not dispose of or enter into any agreements to sell any other properties during the three and six months ended June 30, 2016 and 2015 . (a) Disposed or Held-for-Sale Properties within Continuing Operations The following table is a summary of property dispositions or held-for-sale properties whose operating results are included in continuing operations in our consolidated statements of operations for the periods presented (dollars in thousands): Property Reporting Disposition Date Property Type Square Feet Net Sale Proceeds Storey Park (1) Washington, D.C. 7/25/2016 Land - $ 52,700 NOVA Non-Core Portfolio (2) Northern Virginia 3/25/2016 Various 945,745 90,501 Cedar Hill I and III Northern Virginia 12/23/2015 Office 102,632 25,939 Newington Business Park Center Northern Virginia 12/17/2015 Industrial 255,600 31,409 Rumsey Center Maryland 7/28/2015 Business Park 135,015 14,956 (1) Storey Park was classified as held-for-sale at June 30, 2016. This development site could have supported 712,000 square feet of rentable square feet. (2) Consists of Van Buren Office Park, Herndon Corporate Center, Windsor at Battlefield, Reston Business Campus, Enterprise Center, Gateway Centre Manassas, Linden Business Center and Prosperity Business Center (collectively, the “NOVA Non-Core Portfolio”). On July 25, 2016 , we sold Storey Park, a development site located in our Washington, D.C reporting segment that was 97% owned by us through a consolidated joint venture, for net proceeds of $52.7 million . At June 30, 2016, Storey Park met our held-for-sale criteria and, therefore, the assets of the property were classified within “Assets held-for-sale” and the liabilities of the property were classified within “Liabilities-held-for-sale” on our consolidated balance sheet. The $55.1 million of assets classified within “Assets held-for-sale” at June 30, 2016 primarily consisted of the original cost basis of the land, which was $43.3 million . The majority of the costs in excess of the original cost basis related to architectural fees and site preparation costs, as well as capitalized interest and taxes. “Liabilities held-for-sale” at June 30, 2016 consisted of a $22.0 million loan encumbering the land (the “Storey Park Land Loan”) and $2.5 million of other accrued liabilities. We used the proceeds from the sale to prepay, without penalty, the Storey Park Land Loan, to make a distribution to our 3% joint venture partner for their allocable share of the joint venture’s net assets and to pay down a portion of the outstanding balance of our unsecured revolving credit facility. At December 31, 2015, the NOVA Non-Core Portfolio met our held-for-sale criteria and, therefore, the assets of the buildings were classified within “Assets held-for-sale” and the liabilities of the buildings, which included one mortgage that was defeased in March 2016, were classified within “Liabilities held-for-sale” on our consolidated balance sheet. The majority of the assets classified within assets held-for-sale as of December 31, 2015 consisted of $25.2 million in land and land improvements, $88.0 million in buildings and building improvements, $14.4 million in tenant improvements and $37.0 million of accumulated depreciation. Assets held-for-sale also consisted of immaterial amounts of accrued straight-line rents, net of allowance for doubtful accounts, deferred costs, net of accumulated amortization, and prepaid expenses and other assets. The following table summarizes the aggregate results of operations for the disposed or held-for-sale properties that are included in continuing operations for the periods presented (dollars in thousands): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Revenues $ — $ 5,537 $ 3,366 $ 11,655 Property operating expenses (221 ) (1,999 ) (1,849 ) (4,553 ) Depreciation and amortization — (1,880 ) (114 ) (3,792 ) Interest expense (208 ) (203 ) (392 ) (412 ) Loss on debt extinguishment — — (48 ) — Impairment of rental property (1) (2,772 ) — (2,772 ) — (Loss) income from operations of disposed property (3,201 ) 1,455 (1,809 ) 2,898 Loss on sale of rental property (2) — — (1,155 ) — Net (loss) income from continuing operations $ (3,201 ) $ 1,455 $ (2,964 ) $ 2,898 (1) During the second quarter of 2016, we recorded an impairment charge related to Storey Park based on the anticipated sales price less estimated selling costs. The property was sold on July 25, 2016 . (2) During the first quarter of 2016, we recorded a $1.2 million loss on the sale of the NOVA Non-Core Portfolio. (b) Discontinued Operations The following table is a summary of property dispositions whose operating results are reflected as discontinued operations in our consolidated statements of operations for the periods presented (dollars in thousands): Reporting Segment Disposition Date Property Type Square Feet Net Sale Proceeds Richmond Portfolio (1) Southern Virginia 3/19/2015 Business Park 827,900 $ 53,768 (1) Consists of Chesterfield Business Center, Hanover Business Center, Park Central, Virginia Technology Center and a three-acre parcel of undeveloped land (collectively, the “Richmond Portfolio”). With the sale of our Richmond Portfolio, we no longer owned any properties in the Richmond, Virginia area and had strategically exited the Richmond market. As such, the operating results of the Richmond Portfolio are reflected within discontinued operations in our consolidated statement of operations for the six months ended June 30, 2015. No disposed properties qualified as discontinued operations for the three or six months ended June 30, 2016 or the three months ended June 30, 2015. The following table summarizes the results of operations of properties included in discontinued operations for the six months ended June 30, 2015 (dollars in thousands): 2015 Revenues $ 877 Loss from operations, before taxes (1) (975 ) Loss on debt extinguishment (489 ) Gain on sale of rental property 857 (1) For the first quarter of 2015, we accelerated $2.0 million of unamortized straight-line rents, deferred rent abatements and leasing commissions related to the sale of the Richmond Portfolio.

Debt

Debt	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Debt	Debt Our debt consisted of the following (dollars in thousands): June 30, (1)(2) December 31, 2015 (1)(2) Mortgage loans, net, effective interest rates ranging from 4.22% to 6.01%, maturing at various dates through September 2030 (3)(4) $ 309,879 $ 307,769 Unsecured term loan, net, effective interest rates ranging from LIBOR plus 1.30% to LIBOR plus 1.60%, with staggered maturity dates ranging from December 2020 to December 2022 (3) 299,339 299,404 Unsecured revolving credit facility, net, effective interest rate of LIBOR plus 1.35%, maturing December 2019 (3) 144,159 116,865 Total $ 753,377 $ 724,038 (1) In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented on the balance sheet as a direct deduction from the carrying value of the respective debt liability and is applied on a retrospective basis. The balances include a total of $7.1 million and $8.0 million of unamortized deferred financing costs at June 30, 2016 and December 31, 2015 , respectively. (2) Excludes $22.0 million and $0.2 million of mortgage debt that was classified within “Liabilities held-for-sale” on our consolidated balance sheets at June 30, 2016 and December 31, 2015, respectively. See note 7 , Dispositions , for further discussion. (3) At June 30, 2016 , LIBOR was 0.47% . (4) Includes two construction loans and a land loan. (a) Mortgage Loans The following table provides a summary of our mortgage debt, which includes two construction loans and a land loan (dollars in thousands): Encumbered Property Contractual Effective Maturity June 30, December 31, 2015 Storey Park Land Loan (1)(2) LIBOR + 2.50% LIBOR + 2.50% October 2016 $ — $ 22,000 Hillside I and II 5.75% 4.62% December 2016 12,256 12,368 440 First Street, NW Construction Loan (1)(3) LIBOR + 2.50% LIBOR + 2.50% May 2017 32,216 32,216 Redland Corporate Center Buildings II and III 4.20% 4.64% November 2017 63,885 64,543 Northern Virginia Construction Loan (1) LIBOR + 1.85% LIBOR + 1.85% September 2019 34,583 9,176 840 First Street, NE 5.72% 6.01% July 2020 35,550 35,888 Battlefield Corporate Center 4.26% 4.40% November 2020 3,441 3,526 1211 Connecticut Avenue, NW 4.22% 4.47% July 2022 28,810 29,110 1401 K Street, NW 4.80% 4.93% June 2023 35,894 36,224 11 Dupont Circle, NW 4.05% 4.22% September 2030 66,780 66,780 Principal balance 4.33% (4) 313,415 311,831 Unamortized fair value adjustments 77 172 Unamortized deferred financing costs (5) (3,613 ) (4,234 ) Total balance, net $ 309,879 $ 307,769 Debt Classified within Liabilities-Held-for-Sale Storey Park Land Loan (1)(2) LIBOR + 2.50% LIBOR + 2.50% October 2016 22,000 — Gateway Centre Manassas Building I (6) 7.35% 5.88% November 2016 — 212 Unamortized fair value adjustments — 1 Total balance, net $ 22,000 $ 213 (1) At June 30, 2016 , LIBOR was 0.47% . (2) The Storey Park Land Loan encumbers Storey Park and was entered into by our 97% owned consolidated joint venture that owned Storey Park. At June 30, 2016, $6.0 million of the outstanding principal balance and all of the outstanding accrued interest was recourse to us, per the terms of the loan agreement. The Storey Park Land Loan was classified within “Liabilities held-for-sale” on our June 30, 2016 consolidated balance sheet. In July 2016, our consolidated joint venture sold Storey Park and the Storey Park Land Loan was concurrently repaid with proceeds from the sale. (3) This construction loan (the “440 First Street, NW Construction Loan”) is collateralized by 440 First Street, NW. In May 2016, we extended the maturity date one year to May 30, 2017 . We can repay all or a portion of the construction loan, without penalty, at any time during the term of the loan. At June 30, 2016, per the terms of the loan agreement, 50% of the outstanding principal balance and all of the outstanding accrued interest were recourse to us. (4) Represents the weighted average interest rate. (5) In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented on the balance sheet as a direct deduction from the carrying value of the respective debt liability and is applied on a retrospective basis. (6) The mortgage loan that encumbered Gateway Centre Manassas, which was included in the NOVA Non-Core Portfolio and sold on March 25, 2016, was classified within “Liabilities held-for-sale” on our December 31, 2015 consolidated balance sheet. In February 2016, we used $0.2 million in available cash to defease the outstanding balance of the mortgage loan. Northern Virginia Construction Loan On September 1, 2015, we entered into a construction loan (the “Northern Virginia Construction Loan”) that is collateralized by the NOVA build-to-suit, which is currently in development in Northern Virginia. We completed construction of the new building in the first quarter of 2016 and expect to complete the construction of the tenant improvements in the third quarter of 2016. The loan has a borrowing capacity of up to $43.7 million , of which we borrowed $34.6 million as of June 30, 2016 . The loan has a variable interest rate of LIBOR plus a spread of 1.85% and matures on September 1, 2019. We can repay all or a portion of the Northern Virginia Construction Loan, without penalty, at any time during the term of the loan. (b) Unsecured Term Loan and Unsecured Revolving Credit Facility On December 4, 2015, we amended, restated and consolidated our unsecured revolving credit facility and our unsecured term loan. The amendments extended the maturity date of the unsecured term loan’s three $100 million tranches to December 2020, June 2021 and December 2022 from October 2018, October 2019 and October 2020, respectively and the maturity date of the unsecured revolving credit facility to December 2019 from October 2017, with two, six-month extensions at our option. As part of the amendments, we reduced the interest rate spreads on our unsecured term loan and our unsecured revolving credit facility, reduced the capitalization rates used to calculate gross asset value in the financial covenants and amended the covenant package to more closely align with our corporate goals. The table below shows the outstanding balances and the interest rates of the three tranches of the $300.0 million unsecured term loan at June 30, 2016 (dollars in thousands): Maturity Date Amount (1) Interest Rate (2) Tranche A December 2020 $ 100,000 LIBOR, plus 130 basis points Tranche B June 2021 100,000 LIBOR, plus 130 basis points Tranche C December 2022 100,000 LIBOR, plus 160 basis points Total $ 300,000 (1) Excludes $0.7 million of unamortized deferred financing costs that are deducted from our total unsecured term loan balance in the June 30, 2016 consolidated balance sheet in accordance with ASU 2015-03, which we adopted in the first quarter of 2016. (2) At June 30, 2016 , LIBOR was 0.47% . The interest rate spread is subject to change based on our maximum total indebtedness ratio. For more information, see note 8 (d), Debt – Financial Covenants . In March 2016, we sold the NOVA Non-Core Portfolio for net proceeds of $90.5 million , which we used to temporarily pay down our unsecured revolving credit facility while we gave 30 days’ notice to our preferred shareholders of our intention to redeem an additional 3.6 million 7.750% Series A Preferred Shares (which were subsequently redeemed on April 27, 2016). During the three months ended June 30, 2016, we borrowed $103.0 million under the unsecured revolving credit facility, $90.0 million of which was used to fund the 7.750% Series A Preferred Share redemption that we announced upon the sale of the NOVA Non-Core Portfolio and $13.0 million of which was used to fund construction at the NOVA build-to-suit and for general corporate purposes. During the three months ended June 30, 2016, we repaid $57.0 million of the outstanding balance under the unsecured revolving credit facility. In June 2016, we used $34.0 million of the proceeds from the prepayment of the 950 F Street, NW mezzanine loan to pay down a portion of the outstanding balance of our unsecured revolving credit facility while we gave 30 days’ notice to our preferred shareholders of our intention to redeem the remaining 0.6 million 7.750% Series A Preferred Shares. Also, in June 2016, we used an $18.0 million draw on the Northern Virginia Construction Loan and $5.0 million of available cash to repay a portion of the outstanding balance under the unsecured revolving credit facility. On July 6, 2016, we borrowed $15.0 million under the unsecured revolving credit facility to fund the redemption of the remaining 0.6 million 7.750% Series A Preferred Shares that we had announced upon the prepayment of the 950 F Street, NW mezzanine loan. On July 25, 2016, we repaid $27.0 million of the outstanding balance under the unsecured revolving credit facility using a portion of the proceeds from the Storey Park sale. For the three and six months ended June 30, 2016 , our weighted average borrowings under the unsecured revolving credit facility were $162.3 million and $165.9 million , respectively, with a weighted average interest rate of 1.8% and 1.9% , respectively, compared with weighted average borrowings of $149.4 million and $171.3 million for the three and six months ended June 30, 2015 , respectively, with a weighted average interest rate of 1.9% for both periods in 2015. Our maximum outstanding borrowings were $204.0 million for both the three and six months ended June 30, 2016 , compared with $156.0 million and $218.0 million for the three and six months ended June 30, 2015 , respectively. At June 30, 2016 , outstanding borrowings under the unsecured revolving credit facility were $147.0 million with a weighted average interest rate of 1.8% . Our outstanding borrowings under the unsecured revolving credit facility do not include $2.8 million of unamortized deferred financing costs that are deducted from the facility’s balance in the June 30, 2016 consolidated balance sheet in accordance with ASU 2015-03, which we adopted in the first quarter of 2016. At June 30, 2016 , LIBOR was 0.47% and the applicable spread on our unsecured revolving credit facility was 135 basis points. As of the date of this filing, we had $135.0 million outstanding and $161.1 million available capacity under the unsecured revolving credit facility. We are required to pay a commitment fee at an annual rate of 0.15% of the unused capacity if our usage exceeds 50% of our total capacity under the revolving credit facility, or 0.25% if our usage does not exceed 50%. (c) Interest Rate Swap Agreements At June 30, 2016 , we had eleven interest rate swap agreements outstanding that collectively fixed LIBOR, at a weighted average interest rate of 1.5% , on $300.0 million of our variable rate debt. See note 9 , Derivative Instruments , for more information about our interest rate swap agreements. In July 2016, two swap agreements that together fixed LIBOR at a weighted average interest rate of 1.8% on $60.0 million of variable rate debt expired. (d) Financial Covenants The credit agreement governing our unsecured revolving credit facility and unsecured term loan contains various restrictive covenants, including with respect to liens, indebtedness, investments, distributions, mergers and asset sales. The agreement also includes customary events of default, the occurrence of which, following any applicable cure period, would permit the lenders to, among other things, declare the principal, accrued interest and other obligations of our Company under the agreement to be immediately due and payable. Our outstanding corporate debt agreements contain specific financial covenants that may impact future financing decisions made by us or may be impacted by a decline in operations. These covenants relate to our allowable leverage, minimum tangible net worth, fixed charge coverage and other financial metrics. As of June 30, 2016 , we were in compliance with the covenants of our amended, restated and consolidated unsecured revolving credit facility and unsecured term loan, the 440 First Street, NW Construction Loan, the Northern Virginia Construction Loan and the Storey Park Land Loan. Our continued ability to borrow under the unsecured revolving credit facility is subject to compliance with financial and operating covenants, and a failure to comply with any of these covenants could result in a default under the credit facility. These debt agreements also contain cross-default provisions that would be triggered if we were in default under other loans, including mortgage loans, in excess of certain amounts. In the event of a default, the lenders could accelerate the timing of payments under the debt obligations and we may be required to repay such debt with capital from other sources, which may not be available on attractive terms, or at all, which would have a material adverse effect on our liquidity, financial condition, results of operations and ability to make distributions to our shareholders. Our unsecured revolving credit facility and unsecured term loan are subject to interest rate spreads that float based on the quarterly measurement of our maximum consolidated total indebtedness to gross asset value ratio. Based on our leverage ratio at June 30, 2016 , beginning on August 14, 2016, the applicable interest rate spreads on the unsecured revolving credit facility and tranches A and B of the unsecured term loan will increase by 15 basis points and the applicable interest rate spread on tranche C of the unsecured term loan will increase by 20 basis points.

Derivative Instruments

Derivative Instruments	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments We are exposed to certain risks arising from business operations and economic factors. We use derivative financial instruments to manage exposures that arise from business activities in which our future exposure to interest rate fluctuations is unknown. The objective in the use of an interest rate derivative is to add stability to interest expenses and manage exposure to interest rate changes. We do not use derivatives for trading or speculative purposes and we intend to enter into derivative agreements only with counterparties that we believe have a strong credit rating to mitigate the risk of counterparty default or insolvency. No hedging activity can completely insulate us from the risks associated with changes in interest rates. Moreover, interest rate hedging could fail to protect us or adversely affect us because, among other things: • available interest rate hedging may not correspond directly with the interest rate risk for which we seek protection; • the duration of the hedge may not match the duration of the related liability; • the party owing money in the hedging transaction may default on its obligation to pay; and • the credit quality of the party owing money on the hedge may be downgraded to such an extent that it impairs our ability to sell or assign its side of the hedging transaction. We enter into interest rate swap agreements to hedge our exposure on our variable rate debt against fluctuations in prevailing interest rates. The interest rate swap agreements fix LIBOR to a specified interest rate; however, the swap agreements do not affect the contractual spreads associated with each variable debt instrument’s applicable interest rate. At June 30, 2016 , we had eleven interest rate swap agreements outstanding that collectively fixed LIBOR, at a weighted average interest rate of 1.5% , on $300.0 million of our variable rate debt. Our interest rate swap agreements are summarized below (dollars in thousands): Maturity Date Notional Amount Interest Rate Contractual Component Fixed LIBOR Interest Rate July 2016 (1) $ 35,000 LIBOR 1.754 % July 2016 (1) 25,000 LIBOR 1.763 % July 2017 30,000 LIBOR 2.093 % July 2017 30,000 LIBOR 2.093 % July 2017 25,000 LIBOR 1.129 % July 2017 12,500 LIBOR 1.129 % July 2017 50,000 LIBOR 0.955 % July 2018 12,500 LIBOR 1.383 % July 2018 30,000 LIBOR 1.660 % July 2018 25,000 LIBOR 1.394 % July 2018 25,000 LIBOR 1.135 % Total/Weighted Average $ 300,000 1.505 % (1) The swap agreements expired on July 18, 2016. Our interest rate swap agreements are designated as cash flow hedges and we record the effective portion of any unrealized gains associated with the change in fair value of the swap agreements within “Accumulated other comprehensive loss” and “Prepaid expenses and other assets” and the effective portion of any unrealized losses within “Accumulated other comprehensive loss” and “Accounts payable and other liabilities” on our consolidated balance sheets. We record our proportionate share of any unrealized gains or losses on our cash flow hedges associated with our unconsolidated joint ventures within “Accumulated other comprehensive loss” and “Investment in affiliates” on our consolidated balance sheets. We record any gains or losses incurred as a result of each interest rate swap agreement’s fixed rate deviating from our respective loan’s contractual rate within “Interest expense” on our consolidated statements of operations. We did not have any material ineffectiveness associated with our cash flow hedges during the six months ended June 30, 2016 and 2015 . Amounts reported in accumulated other comprehensive loss related to derivatives will be reclassified to “Interest expense” on our consolidated statements of operations as interest payments are made on our variable-rate debt. We reclassified accumulated other comprehensive losses as an increase to interest expense of $0.8 million and $1.6 million for the three and six months ended June 30, 2016, respectively, and $1.0 million and $2.0 million for the three and six months ended June 30, 2015, respectively. As of June 30, 2016 , we estimated that $2.3 million of our accumulated other comprehensive loss will be reclassified as an increase to interest expense over the following twelve months.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Our application of GAAP outlines a valuation framework and creates a fair value hierarchy, which distinguishes between assumptions based on market data (observable inputs) and a reporting entity’s own assumptions about market data (unobservable inputs). The required disclosures increase the consistency and comparability of fair value measurements and the related disclosures. Fair value is identified, under the standard, as the price that would be received to sell an asset or paid to transfer a liability between willing third parties at the measurement date (an exit price). In accordance with GAAP, certain assets and liabilities must be measured at fair value, and we provide the necessary disclosures that are required for items measured at fair value as outlined in the accounting requirements regarding fair value. Financial assets and liabilities, as well as those non-financial assets and liabilities requiring fair value measurement, are measured using inputs from three levels of the fair value hierarchy. The three levels are as follows: Level 1 - Inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities that we have the ability to access at the measurement date. An active market is defined as a market in which transactions for the assets or liabilities occur with sufficient frequency and volume to provide pricing information on an ongoing basis. Level 2 - Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active (markets with few transactions), inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.), and inputs derived principally from or corroborated by observable market data correlation or other means (market corroborated inputs). Level 3 - Unobservable inputs, only used to the extent that observable inputs are not available, reflect our assumptions about the pricing of an asset or liability. In accordance with accounting provisions and the fair value hierarchy described above, the following table shows the fair value of our consolidated assets and liabilities that are measured on a non-recurring and recurring basis as of June 30, 2016 and December 31, 2015 (dollars in thousands): Balance at Level 1 Level 2 Level 3 Non-recurring Measurements: Impaired real estate assets $ 55,138 $ — $ 55,138 $ — Recurring Measurements: Derivative instrument-swap liabilities 3,158 — 3,158 — Balance at Level 1 Level 2 Level 3 Non-recurring Measurements: Impaired real estate assets $ 104,625 $ — $ 90,625 $ 14,000 Recurring Measurements: Derivative instrument-swap liabilities 2,491 — 2,491 — We did not re-measure or complete any transactions involving non-financial assets or non-financial liabilities that are measured at fair value on a recurring basis during the six months ended June 30, 2016 and 2015 . Also, no transfers into or out of fair value measurement levels for assets or liabilities that are measured on a recurring basis occurred during the six months ended June 30, 2016 and 2015 . Impairment of Rental Property We regularly review market conditions for possible impairment of a property’s carrying value. When circumstances such as adverse market conditions, changes in management’s intended holding period or potential sale to a third party indicate a possible impairment of a property, an impairment analysis is performed. On July 25, 2016 , we sold Storey Park, a development site located in our Washington, D.C. reporting segment. The property was classified as held-for-sale on our consolidated balance sheet at June 30, 2016, and during the second quarter of 2016, we recorded an impairment charge of $2.8 million related to the property based on the anticipated sales price, less estimated selling costs. See note 7 , Dispositions , for more information. In March 2016, we sold our NOVA Non-Core Portfolio, which is located in our Northern Virginia reporting segment. Based on the anticipated sales price, less estimated selling costs, we recorded an impairment charge of $26.9 million for the fourth quarter of 2015, and we recorded an additional loss on the sale of $1.2 million in the first quarter of 2016. See note 7 , Dispositions , for more information. Our One Fair Oaks office property, which is located in our Northern Virginia reporting segment, is currently fully leased to CACI International. We expect CACI International to vacate the property upon their lease expiration in December 2016, and, as a result of the anticipated loss of cash flow and the anticipated challenges re-leasing the property, we evaluated the recoverability of the property's carry value at December 31, 2015, which coincided with our review of year-end results and assessment of overall market conditions. Based on an analysis of the undiscounted net cash flows from One Fair Oaks, we concluded that the carrying value of the property was not recoverable and recorded an impairment charge of $33.9 million to bring the property to its estimated fair value in the fourth quarter of 2015. We estimated the fair value of the property using a discounted cash flow analysis and comparable sales information. In our analysis, we estimated the future net cash flows from the property using an income-based valuation of the building as vacant. The expected useful life and holding period was based on the age of the property and our current plan for the property as well as experience with similar properties. The capitalization rate was estimated using rates from external market research and comparable market transactions, and the discount rate was estimated using a risk adjusted rate of return. Interest Rate Derivatives At June 30, 2016 , we had hedged $300.0 million of our variable rate debt through eleven interest rate swap agreements. See note 9 , Derivative Instruments , for more information about our interest rate swap agreements. The interest rate derivatives are fair valued based on prevailing market yield curves on the measurement date and also incorporate credit valuation adjustments to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting any applicable credit enhancements, such as collateral postings, thresholds, mutual inputs and guarantees. We use a third party to assist in valuing our interest rate swap agreements. A daily “snapshot” of the market is taken to obtain close of business rates. The snapshot includes over 7,500 rates including LIBOR fixings, Eurodollar futures, swap rates, exchange rates, treasuries, etc. This market data is obtained via direct feeds from Bloomberg and Reuters and from Inter-Dealer Brokers. The selected rates are compared to their historical values. Any rate that has changed by more than normal mean and related standard deviation would be considered an outlier and flagged for further investigation. The rates are then compiled through a valuation process that generates daily valuations, which are used to value our interest rate swap agreements. Our interest rate swap derivatives are effective cash flow hedges and the effective portion of the change in fair value is recorded in the equity section of our consolidated balance sheets as “Accumulated other comprehensive loss.” Financial Instruments The carrying amounts of cash equivalents, accounts and other receivables, accounts payable and other liabilities, with the exception of any items listed above, approximate their fair values due to their short-term maturities. We determine the fair value of our notes receivable and debt instruments by discounting future contractual principal and interest payments using prevailing market rates for securities with similar terms and characteristics at the balance sheet date. We deem the fair value measurement of our debt instruments as a Level 2 measurement as we use quoted interest rates for similar debt instruments to value our debt instruments. We used quoted market interest rates for similar notes to value our notes receivable at December 31, 2015, which we considered a Level 2 measurement as we do not believe notes receivable trade in an active market. The carrying amount and estimated fair value of our notes receivable and debt instruments are as follows (dollars in thousands): June 30, 2016 December 31, 2015 Carrying (3) Fair Carrying (3) Fair Financial Assets: Notes receivable (1) $ — $ — $ 34,000 $ 34,000 Financial Liabilities: Mortgage debt (2) $ 335,492 $ 324,884 $ 312,216 $ 298,541 Unsecured term loan 300,000 300,000 300,000 300,000 Unsecured revolving credit facility 147,000 147,000 120,000 120,000 Total $ 782,492 $ 771,884 $ 732,216 $ 718,541 (1) The note receivable was prepaid on June 2, 2016. See note 5 , Notes Receivable , for more information regarding the prepayment of the note receivable. (2) Includes $22.0 million and $0.2 million of mortgage debt that was classified within “Liabilities held-for-sale” on our consolidated balance sheets at June 30, 2016 and December 31, 2015, respectively. See note 7 , Dispositions, for additional information. (3) In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the respective debt liability and which is applied on a retrospective basis. The debt balances exclude a combined total of $7.1 million and $8.0 million of unamortized deferred financing costs at June 30, 2016 and December 31, 2015, respectively.

Equity

Equity	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Equity	Equity In December 2015, our Board of Trustees authorized the redemption of some or all of our 6.4 million outstanding shares of our 7.750% Series A Preferred Shares. On January 19, 2016 and April 27, 2016 , we used proceeds from dispositions to redeem 2.2 million shares and 3.6 million shares, respectively, of our 7.750% Series A Preferred Shares at a redemption price of $25.00 per share, plus accrued dividends up to the applicable dates of redemption. On July 6, 2016 , we used proceeds from the repayment of the 950 F Street, NW mezzanine loan to redeem the remaining 0.6 million outstanding shares of our 7.750% Series A Preferred Shares at a redemption price of $25.00 per share, plus accrued dividends up to the applicable dates of redemption. Prior to the July 6, 2016 preferred share redemption, we were required to give the preferred shareholders 30 days’ written notice of our intent to redeem our 7.750% Series A Preferred Shares, in whole or in part. During the 30-day period from the date of notification to our preferred shareholders to the redemption of our remaining 0.6 million 7.750% Series A Preferred Shares, the net proceeds from 950 F Street, NW loan prepayment were used to temporarily pay down a portion of the balance of our unsecured revolving credit facility. The 7.750% Series A Preferred Shares (NYSE: FPO-PA) were delisted from trading on the New York Stock Exchange upon redemption of the remaining 0.6 million outstanding shares on July 6, 2016 . In July 2015, our Board of Trustees authorized a share repurchase program that allows us to acquire up to five million of our common shares of beneficial interest from time to time through July 2016 in open market transactions at prevailing prices or in negotiated private transactions. We are not obligated to acquire any particular amount of common shares and the share repurchase program may be suspended by the Board of Trustees at any time. During 2015, we repurchased 924,198 shares at a weighted average share price of $10.99 for a total purchase price of $10.2 million , utilizing proceeds from dispositions. During the six months ended June 30, 2016, we did not repurchase any common shares under the share repurchase program. No common shares were repurchased during July 2016, and as of the date of this filing, we are no longer authorized to repurchase any additional common shares under the previously authorized share repurchase program. On July 25, 2016 , we declared a dividend of $0.10 per common share, equating to an annualized dividend of $0.40 per common share. The dividend will be paid on August 15, 2016 to common shareholders of record as of August 8, 2016 . Dividends on non-vested share awards that are expected to vest are recorded as a reduction of shareholders’ equity and dividends on non-vested share awards that are not expected to vest are recorded as compensation expense. Any adjustments to the vesting estimates are recorded in the current period. For each dividend paid by us on our common shares, the Operating Partnership distributes an equivalent distribution on our common Operating Partnership units. On April 26, 2016 , we declared a dividend of $0.10 per common share, equating to an annualized dividend of $0.40 per common share. The dividend was paid on May 16, 2016 to common shareholders of record as of May 9, 2016 . Our unsecured revolving credit facility and unsecured term loan, the 440 First Street, NW Construction Loan, the Northern Virginia Construction Loan and the Storey Park Land Loan contain certain restrictions that include, among other things, requirements to maintain specified coverage ratios and other financial covenants, which may limit our ability to make distributions to our common and preferred shareholders, except for distributions required to maintain our qualification as a REIT. As a result of the redemption feature of the Operating Partnership units, the noncontrolling interests associated with the Operating Partnership are recorded outside of permanent equity. Our equity and redeemable noncontrolling interests are as follows (dollars in thousands): First Potomac Realty Trust Non-redeemable noncontrolling interests Total Equity Redeemable noncontrolling interests Balance at December 31, 2015 $ 624,528 $ 800 $ 625,328 $ 28,813 Net loss (1,556 ) (110 ) (1,666 ) (427 ) Changes in ownership, net (141,506 ) — (141,506 ) (1,417 ) Distributions to owners (18,953 ) — (18,953 ) (651 ) Other comprehensive loss, net (632 ) — (632 ) (28 ) Balance at June 30, 2016 $ 461,881 $ 690 $ 462,571 $ 26,290 First Potomac Realty Trust Non-redeemable noncontrolling interests Total Equity Redeemable noncontrolling interests Balance at December 31, 2014 $ 710,007 $ 898 $ 710,905 $ 33,332 Net income (loss) 1,195 (2 ) 1,193 (225 ) Changes in ownership, net 3,219 — 3,219 (1,916 ) Distributions to owners (23,811 ) (96 ) (23,907 ) (788 ) Other comprehensive loss, net (314 ) — (314 ) (14 ) Balance at June 30, 2015 $ 690,296 $ 800 $ 691,096 $ 30,389 A summary of our accumulated other comprehensive loss is as follows (dollars in thousands): 2016 2015 Beginning balance at January 1, $ (2,360 ) $ (3,268 ) Net unrealized loss on derivative instruments (660 ) (328 ) Net loss attributable to noncontrolling interests 28 14 Ending balance at June 30, $ (2,992 ) $ (3,582 )

Noncontrolling Interests

Noncontrolling Interests	6 Months Ended
	Jun. 30, 2016
Noncontrolling Interest [Abstract]
Noncontrolling Interests	Noncontrolling Interests (a) Noncontrolling Interests in the Operating Partnership Noncontrolling interests relate to the common interests in the Operating Partnership not owned by us. Interests in the Operating Partnership are owned by limited partners who contributed buildings and other assets to the Operating Partnership in exchange for common Operating Partnership units. Limited partners have the right to tender their units for redemption in exchange for, at our option, our common shares on a one-for-one basis or cash based on the fair value of our common shares at the date of redemption. Unitholders receive a distribution per unit equivalent to the dividend per common share. Differences between amounts paid to redeem noncontrolling interests and their carrying values are charged or credited to equity. As a result of the redemption feature of the Operating Partnership units, the noncontrolling interests are recorded outside of permanent equity. Noncontrolling interests are presented at the greater of their fair value or their cost basis, which is comprised of their fair value at issuance, subsequently adjusted for the noncontrolling interests’ share of net income or losses available to common shareholders, other comprehensive income or losses, distributions received or additional contributions. We account for issuances of common Operating Partnership units individually, which could result in some portion of our noncontrolling interests being carried at fair value with the remainder being carried at historical cost. Based on the closing price of our common shares at June 30, 2016 , the cost to acquire, through cash purchase or issuance of our common shares, all of the outstanding common Operating Partnership units not owned by us was $23.7 million . At June 30, 2016 and December 31, 2015 , we recorded adjustments of $3.2 million and $4.0 million , respectively, to present certain common Operating Partnership units at the greater of their carrying value or redemption value. At June 30, 2016 , 2,577,478 of the total common Operating Partnership units, or 4.2% , were not owned by us. During the six months ended June 30, 2016 and 2015 , 41,591 and 11,508 common Operating Partnership units, respectively, were redeemed with available cash. No common Operating Partnership units were redeemed for common shares during the six months ended June 30, 2016 or 2015 . (b) Noncontrolling Interests in a Consolidated Partnership When we are deemed to have a controlling interest in a partially-owned entity, we will consolidate all of the entity’s assets, liabilities and operating results within our condensed consolidated financial statements. The net assets contributed to the consolidated entity by the third party, if any, will be reflected within permanent equity in our consolidated balance sheets to the extent they are not mandatorily redeemable. The amount will be recorded based on the third party’s initial investment in the consolidated entity and will be adjusted to reflect the third party’s share of earnings or losses in the consolidated entity and any distributions received or additional contributions made by the third party. The earnings or losses from the entity attributable to the third party are recorded as a component of “Net loss attributable to noncontrolling interests” on our consolidated statements of operations. On August 4, 2011, we formed a joint venture, in which we have a 97% interest, with an affiliate of Perseus Realty, LLC to acquire Storey Park in our Washington, D.C. reporting segment, which was placed into development in August 2013. Storey Park was sold July 25, 2016 , at which time all assets and liabilities owned by the joint venture were either sold or settled at the time of disposition and the remaining proceeds from the sale were distributed to the joint venture partners in accordance with the terms of the joint venture agreement. See note 7 , Dispositions , for more information.

Share-Based Payments

Share-Based Payments	6 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Share-Based Payments	Share-Based Payments We record costs related to our share-based compensation based on the grant-date fair value calculated in accordance with GAAP. We recognize share-based compensation costs on a straight-line basis over the requisite service period for each award and these costs are recorded within “General and administrative expense” or “Property operating expense” on our consolidated statements of operations based on the employee’s job function. Non-Vested Share Awards We issue non-vested common share awards that either vest over a specific time period that is identified at the time of issuance or vest upon the achievement of specific performance goals that are identified at the time of issuance. We issue new common shares, subject to restrictions, upon each grant of non-vested common share awards. In May 2016, we granted a total of 36,828 non-vested common shares to our non-employee trustees. The awards will vest on the earlier of the first anniversary of the award date or the date of our 2017 annual meeting of shareholders, subject to continued service by the trustee until that date. We recognized compensation expense associated with our non-vested common share awards of $0.5 million and $0.9 million during the three and six months ended June 30, 2016 , respectively, compared with $0.7 million and $1.3 million during the three and six months ended June 30, 2015 , respectively. Dividends on all non-vested common share awards are recorded as a reduction of equity. We apply the two-class method for determining EPS as our outstanding non-vested common shares with non-forfeitable dividend rights are considered participating securities. Our excess of dividends over earnings related to participating securities are shown as a reduction in net income or loss attributable to common shareholders in our computation of EPS. A summary of our non-vested common share awards at June 30, 2016 is as follows: Non-vested Common Shares Weighted Average Grant Date Fair Value Non-vested at March 31, 2016 531,502 $ 10.45 Granted 36,828 8.96 Vested (36,261 ) 10.94 Non-vested at June 30, 2016 532,069 $ 10.31 We value our non-vested time-based share awards at the grant date fair value, which is the market price of our common shares. As of June 30, 2016 , we had $4.4 million of unrecognized compensation cost related to non-vested common shares. We anticipate this cost will be recognized over a weighted-average period of 3.4 years. In May 2016, our shareholders authorized an additional 4.1 million common shares for issuance under the Company’s 2009 Equity Compensation Plan, as amended (the “2009 Plan”). As of June 30, 2016, we had 11.5 million common shares authorized for issuance under the 2009 Plan and, of those authorized awards, 5.5 million common shares remained available for issuance by us.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Segment Information	Segment Information Our reportable segments consist of four distinct reporting and operational segments within the greater Washington, D.C. region in which we operate: Washington, D.C., Maryland, Northern Virginia and Southern Virginia. We evaluate the performance of our segments based on the operating results of the properties located within each segment, which excludes large non-recurring gains and losses, gains or losses from sale of rental property, interest expense, general and administrative costs, acquisition costs or any other indirect corporate expense to the segments. In addition, the segments do not have significant non-cash items other than straight-line and deferred market rent amortization reported in their operating results. There are no inter-segment sales or transfers recorded between segments. The results of operations of our four reporting segments for the three and six months ended June 30, 2016 and 2015 are as follows (dollars in thousands): Three Months Ended June 30, 2016 Washington, D.C. Maryland Northern Virginia Southern Virginia Consolidated Number of buildings (1) 6 34 14 19 73 Square feet (1) 917,241 1,885,759 1,716,904 2,023,858 6,543,762 Total revenues $ 11,580 $ 10,900 $ 8,707 $ 7,306 $ 38,493 Property operating expense (2,563 ) (2,097 ) (2,194 ) (1,689 ) (8,543 ) Real estate taxes and insurance (2,422 ) (960 ) (943 ) (595 ) (4,920 ) Total property operating income $ 6,595 $ 7,843 $ 5,570 $ 5,022 25,030 Depreciation and amortization expense (15,141 ) General and administrative (4,305 ) Impairment of rental property (2,772 ) Other expenses (4,804 ) Net loss $ (1,992 ) Capital expenditures (2) $ 3,287 $ 2,402 $ 12,297 $ 837 $ 18,895 Three Months Ended June 30, 2015 Washington, D.C. Maryland Northern Virginia Southern Virginia Consolidated Number of buildings (1) 6 38 49 19 112 Square feet (1) 914,912 1,997,789 3,020,388 2,023,927 7,957,016 Total revenues $ 11,154 $ 11,034 $ 13,700 $ 7,151 $ 43,039 Property operating expense (2,987 ) (2,645 ) (3,191 ) (1,838 ) (10,661 ) Real estate taxes and insurance (1,956 ) (896 ) (1,345 ) (614 ) (4,811 ) Total property operating income $ 6,211 $ 7,493 $ 9,164 $ 4,699 27,567 Depreciation and amortization expense (16,817 ) General and administrative (4,979 ) Other expenses (5,295 ) Net income $ 476 Capital expenditures (2) $ 3,983 $ 2,153 $ 5,037 $ 910 $ 12,083 Six Months Ended June 30, 2016 Washington, D.C. Maryland Northern Virginia Southern Virginia Consolidated Total revenues $ 22,869 $ 22,488 $ 21,014 $ 14,819 $ 81,190 Property operating expense (5,532 ) (5,329 ) (5,514 ) (3,705 ) (20,080 ) Real estate taxes and insurance (4,794 ) (1,889 ) (2,240 ) (1,213 ) (10,136 ) Total property operating income $ 12,543 $ 15,270 $ 13,260 $ 9,901 50,974 Depreciation and amortization expense (30,147 ) General and administrative (8,884 ) Impairment of rental property (2,772 ) Other expenses (11,264 ) Net loss $ (2,093 ) Total assets (3) $ 503,484 $ 335,932 $ 298,533 $ 163,956 $ 1,320,046 Capital expenditures (2) $ 8,198 $ 3,361 $ 28,054 $ 1,734 $ 41,539 Six Months Ended June 30, 2015 Washington, D.C. Maryland Northern Virginia Southern Virginia Consolidated Total revenues $ 22,186 $ 22,739 $ 27,815 $ 14,148 $ 86,888 Property operating expense (6,126 ) (6,663 ) (7,257 ) (3,729 ) (23,775 ) Real estate taxes and insurance (3,979 ) (1,788 ) (2,894 ) (1,193 ) (9,854 ) Total property operating income $ 12,081 $ 14,288 $ 17,664 $ 9,226 53,259 Depreciation and amortization expense (33,151 ) General and administrative (10,505 ) Other expenses (8,028 ) Loss from discontinued operations (607 ) Net income $ 968 Total assets (3)(4) $ 503,259 $ 356,736 $ 450,324 $ 167,835 $ 1,532,197 Capital expenditures (2) $ 7,419 $ 4,317 $ 15,880 $ 3,400 $ 31,325 (1) Excludes Storey Park from our Washington, D.C. reporting segment, as the property was in development for the periods presented. Storey Park was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016 . On January 1, 2016, we ceased capitalizing expenses associated with the development project as it was being marketed for sale. (2) Capital expenditures for corporate assets not allocated to any of our reportable segments totaled $72 and none for the three months ended June 30, 2016 and 2015 , respectively, and $192 and $309 for the six months ended June 30, 2016 and 2015 , respectively. (3) Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6 , Investment in Affiliates . Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015 , respectively. (4) Total assets at June 30, 2015 have been restated to exclude a total of $5.3 million of unamortized deferred financing costs that are now deducted from the respective debt liability in accordance with ASU 2015-03, which we adopted in the first quarter of 2016.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation Our unaudited condensed consolidated financial statements include our accounts and the accounts of our Operating Partnership, which we consider to be a variable interest entity (“VIE”), and the subsidiaries in which we or our Operating Partnership has a controlling interest, which includes First Potomac Management, LLC, a wholly-owned subsidiary that manages the majority of our properties. All intercompany balances and transactions have been eliminated in consolidation. We have condensed or omitted certain information and note disclosures normally included in financial statements presented in accordance with U.S. generally accepted accounting principles (“GAAP”) in the accompanying unaudited condensed consolidated financial statements. We believe the disclosures made are adequate to prevent the information presented from being misleading. However, the unaudited condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in our annual report on Form 10-K for the year ended December 31, 2015 and as updated from time to time in our other filings with the SEC. In our opinion, the accompanying unaudited condensed consolidated financial statements reflect all adjustments, consisting of normal recurring adjustments and accruals necessary to present fairly our financial position as of June 30, 2016 and the results of our operations, our comprehensive loss and our cash flows for the three and six months ended June 30, 2016 and 2015 . Interim results are not necessarily indicative of full-year performance due, in part, to the timing of transactions and the impact of acquisitions and dispositions throughout the year, as well as the seasonality of certain operating expenses such as utilities expense and snow and ice removal costs.
Use of Estimates	Use of Estimates The preparation of unaudited condensed consolidated financial statements in conformity with GAAP requires our management team to make a number of estimates and assumptions relating to the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the unaudited condensed consolidated financial statements and the reported amounts of revenues and expenses during the period. Estimates include the amount of accounts receivable that may be uncollectible, future cash flows, discount and capitalization rate assumptions used to fair value acquired properties and to test impairment of certain long-lived assets and goodwill, derivative valuations, market lease rates, lease-up periods, leasing and tenant improvement costs used to fair value intangible assets acquired and probability weighted cash flow analysis used to fair value contingent liabilities. Actual results could differ from those estimates.
Rental Property	Rental Property Rental property is initially recorded at fair value, when acquired in a business combination, or initial cost when constructed or acquired in an asset purchase. Improvements and replacements are capitalized at cost when they extend the useful life, increase capacity or improve the efficiency of the asset. Repairs and maintenance are charged to expense when incurred. Depreciation and amortization are recorded on a straight-line basis over the estimated useful lives of the assets. The estimated useful lives of our assets, by class, are as follows: Buildings 39 years Building improvements 5 to 20 years Furniture, fixtures and equipment 5 to 15 years Lease related intangible assets The term of the lease Tenant improvements Shorter of the useful life of the asset or the term of the related lease We regularly review market conditions for possible impairment of a property’s carrying value. When circumstances such as adverse market conditions, changes in management’s intended holding period or potential sale to a third party indicate a possible impairment of the carrying value of a property, an impairment analysis is performed. We assess potential impairments based on an estimate of the future undiscounted cash flows (excluding interest charges) expected to result from the property’s use and eventual disposition. This estimate is based on projections of future revenues, expenses, capital improvement costs to maintain the operating capacity, expected holding periods and capitalization rates. These cash flows consider factors such as expected market trends and leasing prospects, as well as the effects of leasing demand, competition and other factors. If impairment exists due to the inability to recover the carrying value of a real estate investment based on forecasted undiscounted cash flows, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair value of the property. Further, we will record an impairment loss if we expect to dispose of a property in the near term, at a price below carrying value. In such an event, we will record an impairment loss based on the difference between a property’s carrying value and its projected sales price less any estimated costs to sell. We will classify a building as held-for-sale in accordance with GAAP in the period in which we have made the decision to dispose of the building, our Board of Trustees or a designated delegate has approved the sale, there is a binding contract pursuant to which the buyer has significant money at risk, or high likelihood a binding agreement to purchase the property will be signed under which the buyer will be required to commit a significant amount of nonrefundable cash, and no significant financing contingencies exist that could cause the transaction not to be completed in a timely manner. We will cease recording depreciation on a building once it has been classified as held-for-sale. We will also determine whether the disposal of a building qualifies as a discontinued operation in accordance with GAAP by assessing whether the disposal of the building, or group of buildings, represents a strategic shift that has, or will have, a major effect on the Company’s operations or financial results. If the building does not qualify as a discontinued operation in accordance with GAAP, we will classify the building’s operating results, together with any impairment charges and any gains or losses on the sale of the building, in continuing operations for all periods presented in our consolidated statements of operations. We will classify the assets and liabilities related to the building as held-for-sale in our consolidated balance sheet for the period the held-for-sale criteria were met. If the building does qualify as a discontinued operation under GAAP, we will classify the building’s operating results, together with any impairment charges and any gains or losses on the sale of the building, in discontinued operations in our consolidated statements of operations for all periods presented and classify the assets and liabilities related to the building as held-for-sale in our consolidated balance sheets for the periods presented. Interest expense is reclassified to discontinued operations only to the extent the disposed or held-for-sale property is secured by specific mortgage debt and the mortgage debt will not be assigned to another property owned by us after the disposition. We recognize the fair value, if sufficient information exists to reasonably estimate the fair value, of any liability for conditional asset retirement obligations when assumed or incurred, which is generally upon acquisition, construction, development or redevelopment and/or through the normal operation of the asset. We capitalize interest costs incurred on qualifying expenditures for real estate assets under development or redevelopment, which include our investments in assets owned through unconsolidated joint ventures that are under development or redevelopment, while being readied for their intended use in accordance with accounting requirements regarding capitalization of interest. We will capitalize interest when qualifying expenditures for the asset have been made, activities necessary to get the asset ready for its intended use are in progress and interest costs are being incurred. Capitalized interest also includes interest associated with expenditures incurred to acquire developable land while development activities are in progress. We also capitalize direct compensation costs of our construction personnel who manage the development and redevelopment projects, but only to the extent the employee’s time can be allocated to a project. Any portion of construction management costs not directly attributable to a specific project are recognized as general and administrative expense in the period incurred. We do not capitalize any other general and administrative costs such as office supplies, office rent expense or an overhead allocation to our development or redevelopment projects. Capitalized compensation costs were immaterial for the three and six months ended June 30, 2016 and 2015 . Capitalization of interest ends when the asset is substantially complete and ready for its intended use, but no later than one year from completion of major construction activity, if the property is not occupied. We place redevelopment and development assets into service at this time and commence depreciation upon the substantial completion of tenant improvements and the recognition of revenue. Capitalized interest is depreciated over the useful life of the underlying assets, commencing when those assets are placed into service.
Notes Receivable	Notes Receivable We provide loans to the owners of real estate properties, which can be collateralized by interest in the real estate property. We record these loans as “Notes receivable” in our consolidated balance sheets. The loans will be recorded net of any discount or issuance costs, which will be amortized over the life of the respective note receivable using the effective interest method. We record interest earned from notes receivable and amortization of any discount costs or issuance costs within “Interest and other income” in our consolidated statements of operations. We will establish a provision for anticipated credit losses associated with our notes receivable when we anticipate that we may be unable to collect any contractually due amounts. This determination is based upon such factors as delinquencies, loss experience, collateral quality and current economic or borrower conditions. Our collectability of our notes receivable may be adversely impacted by the financial stability of the Washington, D.C. region and the ability of the underlying assets to keep current tenants or attract new tenants. Estimated losses are recorded as a charge to earnings to establish an allowance for credit losses that we estimate to be adequate based on these factors. During the second quarter of 2016, we received the full repayment of a mezzanine loan with an outstanding principal balance of $34.0 million . We did not have any notes receivable outstanding at June 30, 2016. Based on the review of the above criteria, we did not record an allowance for credit losses for our notes receivable during the six months ended June 30, 2015 .
Application of New Accounting Standards	Application of New Accounting Standards In January 2016, we adopted Accounting Standards Update No. 2015-01, Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items (“ASU 2015-01”), which eliminates the concept of extraordinary items from GAAP and the requirement that an entity separately report extraordinary items in the income statement. ASU 2015-01 also requires that entities continue to evaluate whether items are unusual in nature or infrequent in occurrence for presentation and disclosure purposes. The adoption of ASU 2015-01 did not have a material impact on our unaudited condensed consolidated financial statements and related disclosures. In January 2016, we adopted ASU No. 2015-02, Amendments to the Consolidation Analysis (“ASU 2015-02”). This standard amends certain guidance applicable to the consolidation of various legal entities, including variable interest entities (“VIE”). In determining the method of accounting for partially owned joint ventures, we evaluate the characteristics of associated entities and determine whether an entity is a VIE and, if so, determine which party is the primary beneficiary by analyzing whether we have both the power to direct the entity's significant economic activities and the obligation to absorb potentially significant losses or receive potentially significant benefits. Significant judgments and assumptions inherent in this analysis include the nature of the entity's operations, the entity's financing and capital structure, and contractual relationship and terms, including consideration of governance and decision making rights. We consolidate a VIE when we have determined that we are the primary beneficiary. We evaluated the application of ASU 2015-02 and concluded that no change was required to our accounting for any of our interests in less than wholly owned joint ventures. We continued to consolidate our joint venture in Storey Park, which was sold on July 25, 2016, as described in note 12(b), Noncontrolling Interests in a Consolidated Partnership , as it continued to meet the definition and certain criteria as a VIE in which we were considered to be the primary beneficiary. Under ASU 2015-02, our Operating Partnership now meets the definition of a VIE, we are the primary beneficiary, and, accordingly, we continue to consolidate the Operating Partnership. Our sole significant asset is our investment in the Operating Partnership and, consequently, substantially all of our assets and liabilities represent assets and liabilities of the Operating Partnership. All of our debt is an obligation of the Operating Partnership and may only be settled with the assets of the Operating Partnership. In January 2016, we adopted Accounting Standards Update No. 2015-03, Simplifying the Presentation of Debt Issuance Costs (“ASU 2015-03”), which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the debt liability. ASU 2015-03 is applied on a retrospective basis, which resulted in the reclassification of our debt issuance costs from previously presented balances. The guidance did not have a material impact on our unaudited condensed consolidated financial statements and related disclosures. In January 2016, we adopted Accounting Standards Update No. 2015-16, Simplifying the Accounting for Measurement-Period Adjustments (“ASU 2015-16”), which eliminates the requirement for an acquirer to retrospectively adjust the financial statements for measurement-period adjustments that occur in periods after the acquisition of a business combination. The acquirer would instead recognize measurement-period adjustments in the reporting period in which the adjustment is identified. The adoption of ASU 2015-16 did not have a material impact on our unaudited condensed consolidated financial statements and related disclosures. In May 2014, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (“ASU 2014-09”), which requires an entity to recognize the amount of revenue to which it expects to be entitled for the transfer of promised goods or services to customers and will replace most existing revenue recognition guidance when it becomes effective. In July 2015, the FASB deferred by one year the mandatory effective date of ASU 2014-09 from January 1, 2017 to January 1, 2018. Early adoption is permitted, but not prior to the original effective date of January 1, 2017. ASU 2014-09 permits the use of either the retrospective or cumulative effect transition method. We have not yet selected a transition method and are evaluating the impact that ASU 2014-09 will have on our consolidated financial statements and related disclosures. In August 2014, the FASB issued Accounting Standards Update No. 2014-15, Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern (“ASU 2014-15”), which requires an entity to evaluate whether conditions or events, in the aggregate, raise substantial doubt about the entity’s ability to continue as a going concern for one year from the date the financial statements are issued or are available to be issued. The guidance will become effective for annual periods ending after December 15, 2016. The adoption of ASU 2014-15 is not expected to have an impact on our consolidated financial statements and related disclosures. In January 2016, the FASB issued Accounting Standards Update No. 2016-01, Recognition and Measurement of Financial Assets and Financial Liabilities (“ASU 2016-01”), which requires, among other things, entities to use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value disclosed for financial instruments measured at amortized cost on the balance sheet. ASU 2016-01 is effective for periods beginning after December 15, 2017; early adoption is not permitted. The guidance is not expected to have a material impact on our consolidated financial statements and related disclosures. In February 2016, the FASB issued Accounting Standards Update No. 2016-02 (“ASU 2016-02”), Leases , which requires a lessee to record on the balance sheet a right-of-use asset with a corresponding lease liability created by lease terms of more than 12 months. Additional qualitative and quantitative disclosures will also be required. The guidance will become effective for periods beginning after December 15, 2018 and will be applied using a modified retrospective transition method. We are currently evaluating the impact that ASU 2016-02 will have on our consolidated financial statements and related disclosures. In March 2016, the FASB issued Accounting Standards Update No. 2016-09 (“ASU 2016-09”), Improvements to Employee Share-Based Payment Accounting, which is intended to simplify several aspects of the accounting for employee share-based payment transactions, including income tax consequences, classification of awards as either equity or liabilities and classification on the statement of cash flows. The guidance will become effective for periods beginning after December 15, 2016 and early adoption is permitted. ASU 2016-09 permits the use of the cumulative-effect and prospective methods. While we are currently evaluating the impact of this standard and whether we will elect to early adopt the standard, we do not believe this standard will have a material impact on our consolidated financial statements or related disclosures.
Reclassifications	Reclassifications Certain prior year asset and debt balances have been reclassified to conform to the current year presentation as a result of adopting ASU 2015-03 in January 2016, which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the debt liability and which is applied on a retrospective basis. See note 2(e), Summary of Significant Accounting Policies - Application of New Accounting Standards for more information.

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2016
Accounting Policies [Abstract]
Estimated Useful Life of Assets	Buildings 39 years Building improvements 5 to 20 years Furniture, fixtures and equipment 5 to 15 years Lease related intangible assets The term of the lease Tenant improvements Shorter of the useful life of the asset or the term of the related lease

Earnings Per Common Share (Tabl

Earnings Per Common Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Computation of Company's Basic and Diluted Earnings Per Share	The following table sets forth the computation of our basic and diluted earnings per common share (dollars in thousands, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Numerator for basic and diluted earnings per common share: (Loss) income from continuing operations $ (1,992 ) $ 476 $ (2,093 ) $ 1,575 Loss from discontinued operations — — — (607 ) Net (loss) income (1,992 ) 476 (2,093 ) 968 Less: Net loss from continuing operations attributable to noncontrolling interests 390 114 537 201 Less: Net loss from discontinued operations attributable to noncontrolling interests — — — 26 Net (loss) income attributable to First Potomac Realty Trust (1,602 ) 590 (1,556 ) 1,195 Less: Dividends on preferred shares (794 ) (3,100 ) (3,042 ) (6,200 ) Less: Issuance costs of redeemed preferred shares (1) (3,095 ) — (4,999 ) — Net loss attributable to common shareholders (5,491 ) (2,510 ) (9,597 ) (5,005 ) Less: Allocation to participating securities (53 ) (69 ) (126 ) (142 ) Net loss attributable to common shareholders $ (5,544 ) $ (2,579 ) $ (9,723 ) $ (5,147 ) Denominator for basic and diluted earnings per common share: Weighted average common shares outstanding: Basic and diluted 57,577 58,280 57,559 58,241 Basic and diluted earnings per common share: Loss from continuing operations attributable to common shareholders $ (0.10 ) $ (0.04 ) $ (0.17 ) $ (0.08 ) Loss from discontinued operations attributable to common shareholders — — — (0.01 ) Net loss attributable to common shareholders $ (0.10 ) $ (0.04 ) $ (0.17 ) $ (0.09 ) (1) Represents the original issuance costs associated with the redemption of 3.6 million and 5.8 million 7.750% Series A Cumulative Redeemable Perpetual Preferred Shares during the three and six months ended June 30, 2016, respectively.
Anti-Dilutive Shares Not Included in Calculation of Diluted Earnings Per Share	In accordance with GAAP regarding earnings per common share, we did not include the following potential weighted average common shares in our calculation of diluted earnings per common share as they are anti-dilutive for the periods presented (amounts in thousands): Three Months Ended Six Months Ended 2016 2015 2016 2015 Stock option awards 982 1,046 1,000 1,069 Non-vested share awards 489 405 505 450 1,471 1,451 1,505 1,519

Rental Property (Tables)

Rental Property (Tables)	6 Months Ended
	Jun. 30, 2016
Real Estate [Abstract]
Summary of Rental Property	Rental property consists of the following (dollars in thousands): June 30, 2016 (1) December 31, 2015 (2) Land and land improvements $ 279,163 $ 280,149 Buildings and improvements 800,647 793,184 Construction in progress 45,085 97,361 Tenant improvements 191,654 168,946 Furniture, fixtures and equipment 398 410 1,316,947 1,340,050 Less: accumulated depreciation (231,839 ) (209,784 ) $ 1,085,108 $ 1,130,266 (1) Excludes rental property totaling $55.1 million at June 30, 2016 related to Storey Park, which was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016 . (2) Excludes rental property totaling $90.6 million at December 31, 2015 related to the NOVA Non-Core Portfolio (as defined in note 7, Dispositions ), which was classified as held-for-sale at December 31, 2015 and was sold on March 25, 2016 .

Investment in Affiliates (Table

Investment in Affiliates (Tables)	6 Months Ended
	Jun. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
mortgage debt of joint ventures [Table Text Block]	The following table provides a summary of the mortgage debt held by our unconsolidated joint ventures (dollars in thousands): FPO Ownership Effective Interest Rate Maturity Date Principal Balance at June 30, 2016 (1) Principal Balance at December 31, 2015 (1) Rivers Park I and II (2) 25% LIBOR + 1.90% (3) September 2017 $ 28,000 $ 28,000 1750 H Street, NW (4) 50% 3.92% August 2024 32,000 32,000 Prosperity Metro Plaza (5) 51% 3.91% December 2029 50,000 50,000 Weighted Average / Total 3.52% $ 110,000 $ 110,000 (1) Reflects the entire balance of the debt secured by the properties, not our portion of the debt. (2) The loan is repayable in full, without penalty, at any time during the term of the loan. Of the outstanding principal balance, $2.8 million is recourse to us. We believe the fair value of the potential liability to us related to the recourse debt is inconsequential as the likelihood of our need to perform under the debt agreement is remote. (3) At June 30, 2016 , LIBOR was 0.47% . All references to LIBOR in the condensed consolidated financial statements refer to one-month LIBOR. (4) The loan requires interest-only payments with a constant interest rate over the life of the loan. The loan is repayable in full, without penalty, on or after August 1, 2021. (5) The loan requires interest-only payments through December 2024, at which time the loan requires principal and interest payments through its maturity date. The loan is repayable in full without penalty on or after June 1, 2029.
Schedule of Equity Method Investments [Line Items]
Components of Investments in Affiliates	Our investment in affiliates consisted of the following (dollars in thousands): Reporting Segment Ownership Investment at June 30, 2016 Investment at December 31, 2015 Prosperity Metro Plaza Northern Virginia 51% $ 25,678 $ 24,909 1750 H Street, NW Washington, D.C. 50% 14,870 15,168 Aviation Business Park Maryland 50% 5,847 5,899 Rivers Park I and II (1) Maryland 25% 2,320 2,247 $ 48,715 $ 48,223 (1) Rivers Park I and Rivers Park II are owned through two separate joint ventures.
Net Assets of Company's Unconsolidated Joint Ventures	The net assets of our unconsolidated joint ventures consisted of the following (dollars in thousands): June 30, 2016 December 31, 2015 Assets: Rental property, net $ 191,068 $ 193,243 Cash and cash equivalents 7,493 5,992 Other assets 17,775 16,490 Total assets 216,336 215,725 Liabilities: Mortgage loans, net (1)(2) 109,322 109,273 Other liabilities 6,665 7,214 Total liabilities 115,987 116,487 Net assets $ 100,349 $ 99,238 (1) Of the total mortgage debt that encumbers our unconsolidated properties, $2.8 million is recourse to us. We believe the fair value of the potential liability to us under this guaranty is inconsequential as the likelihood of our need to perform under the debt agreement is remote. (2) In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented on the balance sheet as a direct deduction from the carrying value of the respective debt liability and which is applied on a retrospective basis. Mortgage loans, net at both June 30, 2016 and December 31, 2015 included $0.7 million of unamortized deferred financing costs.
Results of Operations of Company's Unconsolidated Joint Ventures	The following table summarizes the results of operations of our unconsolidated joint ventures for the periods presented, which, due to our varying ownership interests in the joint ventures and the varying operations of the joint ventures, may not be reflective of the amounts recorded in our consolidated statements of operations (dollars in thousands): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Total revenues $ 6,240 $ 6,063 $ 12,529 $ 12,230 Total operating expenses (1,814 ) (1,756 ) (3,980 ) (3,912 ) Net operating income 4,426 4,307 8,549 8,318 Depreciation and amortization (2,006 ) (2,287 ) (3,972 ) (4,536 ) Interest expense, net (997 ) (975 ) (1,989 ) (1,948 ) Net income $ 1,423 $ 1,045 $ 2,588 $ 1,834

Dispositions (Tables)

Dispositions (Tables)	6 Months Ended
	Jun. 30, 2016
Discontinued Operations and Disposal Groups [Abstract]
Discontinued Operations Square Feet Area [Table Text Block]	The following table is a summary of property dispositions or held-for-sale properties whose operating results are included in continuing operations in our consolidated statements of operations for the periods presented (dollars in thousands): Property Reporting Disposition Date Property Type Square Feet Net Sale Proceeds Storey Park (1) Washington, D.C. 7/25/2016 Land - $ 52,700 NOVA Non-Core Portfolio (2) Northern Virginia 3/25/2016 Various 945,745 90,501 Cedar Hill I and III Northern Virginia 12/23/2015 Office 102,632 25,939 Newington Business Park Center Northern Virginia 12/17/2015 Industrial 255,600 31,409 Rumsey Center Maryland 7/28/2015 Business Park 135,015 14,956 (1) Storey Park was classified as held-for-sale at June 30, 2016. This development site could have supported 712,000 square feet of rentable square feet. (2) Consists of Van Buren Office Park, Herndon Corporate Center, Windsor at Battlefield, Reston Business Campus, Enterprise Center, Gateway Centre Manassas, Linden Business Center and Prosperity Business Center (collectively, the “NOVA Non-Core Portfolio”).
Schedule of Disposal Groups Including Not Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block]	The following table summarizes the aggregate results of operations for the disposed or held-for-sale properties that are included in continuing operations for the periods presented (dollars in thousands): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Revenues $ — $ 5,537 $ 3,366 $ 11,655 Property operating expenses (221 ) (1,999 ) (1,849 ) (4,553 ) Depreciation and amortization — (1,880 ) (114 ) (3,792 ) Interest expense (208 ) (203 ) (392 ) (412 ) Loss on debt extinguishment — — (48 ) — Impairment of rental property (1) (2,772 ) — (2,772 ) — (Loss) income from operations of disposed property (3,201 ) 1,455 (1,809 ) 2,898 Loss on sale of rental property (2) — — (1,155 ) — Net (loss) income from continuing operations $ (3,201 ) $ 1,455 $ (2,964 ) $ 2,898
Summary of Completed Property Dispositions	The following table is a summary of property dispositions whose operating results are reflected as discontinued operations in our consolidated statements of operations for the periods presented (dollars in thousands): Reporting Segment Disposition Date Property Type Square Feet Net Sale Proceeds Richmond Portfolio (1) Southern Virginia 3/19/2015 Business Park 827,900 $ 53,768 (1) Consists of Chesterfield Business Center, Hanover Business Center, Park Central, Virginia Technology Center and a three-acre parcel of undeveloped land (collectively, the “Richmond Portfolio”).
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	The following table summarizes the results of operations of properties included in discontinued operations for the six months ended June 30, 2015 (dollars in thousands): 2015 Revenues $ 877 Loss from operations, before taxes (1) (975 ) Loss on debt extinguishment (489 ) Gain on sale of rental property 857 (1) For the first quarter of 2015, we accelerated $2.0 million of unamortized straight-line rents, deferred rent abatements and leasing commissions related to the sale of the Richmond Portfolio.

Debt (Tables)

Debt (Tables)	6 Months Ended
	Jun. 30, 2016
Debt Disclosure [Abstract]
Schedule of Borrowings	Our debt consisted of the following (dollars in thousands): June 30, (1)(2) December 31, 2015 (1)(2) Mortgage loans, net, effective interest rates ranging from 4.22% to 6.01%, maturing at various dates through September 2030 (3)(4) $ 309,879 $ 307,769 Unsecured term loan, net, effective interest rates ranging from LIBOR plus 1.30% to LIBOR plus 1.60%, with staggered maturity dates ranging from December 2020 to December 2022 (3) 299,339 299,404 Unsecured revolving credit facility, net, effective interest rate of LIBOR plus 1.35%, maturing December 2019 (3) 144,159 116,865 Total $ 753,377 $ 724,038 (1) In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented on the balance sheet as a direct deduction from the carrying value of the respective debt liability and is applied on a retrospective basis. The balances include a total of $7.1 million and $8.0 million of unamortized deferred financing costs at June 30, 2016 and December 31, 2015 , respectively. (2) Excludes $22.0 million and $0.2 million of mortgage debt that was classified within “Liabilities held-for-sale” on our consolidated balance sheets at June 30, 2016 and December 31, 2015, respectively. See note 7 , Dispositions , for further discussion. (3) At June 30, 2016 , LIBOR was 0.47% . (4) Includes two construction loans and a land loan.
Summary of Company's Mortgage Debt	The following table provides a summary of our mortgage debt, which includes two construction loans and a land loan (dollars in thousands): Encumbered Property Contractual Effective Maturity June 30, December 31, 2015 Storey Park Land Loan (1)(2) LIBOR + 2.50% LIBOR + 2.50% October 2016 $ — $ 22,000 Hillside I and II 5.75% 4.62% December 2016 12,256 12,368 440 First Street, NW Construction Loan (1)(3) LIBOR + 2.50% LIBOR + 2.50% May 2017 32,216 32,216 Redland Corporate Center Buildings II and III 4.20% 4.64% November 2017 63,885 64,543 Northern Virginia Construction Loan (1) LIBOR + 1.85% LIBOR + 1.85% September 2019 34,583 9,176 840 First Street, NE 5.72% 6.01% July 2020 35,550 35,888 Battlefield Corporate Center 4.26% 4.40% November 2020 3,441 3,526 1211 Connecticut Avenue, NW 4.22% 4.47% July 2022 28,810 29,110 1401 K Street, NW 4.80% 4.93% June 2023 35,894 36,224 11 Dupont Circle, NW 4.05% 4.22% September 2030 66,780 66,780 Principal balance 4.33% (4) 313,415 311,831 Unamortized fair value adjustments 77 172 Unamortized deferred financing costs (5) (3,613 ) (4,234 ) Total balance, net $ 309,879 $ 307,769 Debt Classified within Liabilities-Held-for-Sale Storey Park Land Loan (1)(2) LIBOR + 2.50% LIBOR + 2.50% October 2016 22,000 — Gateway Centre Manassas Building I (6) 7.35% 5.88% November 2016 — 212 Unamortized fair value adjustments — 1 Total balance, net $ 22,000 $ 213 (1) At June 30, 2016 , LIBOR was 0.47% . (2) The Storey Park Land Loan encumbers Storey Park and was entered into by our 97% owned consolidated joint venture that owned Storey Park. At June 30, 2016, $6.0 million of the outstanding principal balance and all of the outstanding accrued interest was recourse to us, per the terms of the loan agreement. The Storey Park Land Loan was classified within “Liabilities held-for-sale” on our June 30, 2016 consolidated balance sheet. In July 2016, our consolidated joint venture sold Storey Park and the Storey Park Land Loan was concurrently repaid with proceeds from the sale. (3) This construction loan (the “440 First Street, NW Construction Loan”) is collateralized by 440 First Street, NW. In May 2016, we extended the maturity date one year to May 30, 2017 . We can repay all or a portion of the construction loan, without penalty, at any time during the term of the loan. At June 30, 2016, per the terms of the loan agreement, 50% of the outstanding principal balance and all of the outstanding accrued interest were recourse to us. (4) Represents the weighted average interest rate. (5) In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented on the balance sheet as a direct deduction from the carrying value of the respective debt liability and is applied on a retrospective basis. (6) The mortgage loan that encumbered Gateway Centre Manassas, which was included in the NOVA Non-Core Portfolio and sold on March 25, 2016, was classified within “Liabilities held-for-sale” on our December 31, 2015 consolidated balance sheet. In February 2016, we used $0.2 million in available cash to defease the outstanding balance of the mortgage loan.
Unsecured Term Loan	On December 4, 2015, we amended, restated and consolidated our unsecured revolving credit facility and our unsecured term loan. The amendments extended the maturity date of the unsecured term loan’s three $100 million tranches to December 2020, June 2021 and December 2022 from October 2018, October 2019 and October 2020, respectively and the maturity date of the unsecured revolving credit facility to December 2019 from October 2017, with two, six-month extensions at our option. As part of the amendments, we reduced the interest rate spreads on our unsecured term loan and our unsecured revolving credit facility, reduced the capitalization rates used to calculate gross asset value in the financial covenants and amended the covenant package to more closely align with our corporate goals. The table below shows the outstanding balances and the interest rates of the three tranches of the $300.0 million unsecured term loan at June 30, 2016 (dollars in thousands): Maturity Date Amount (1) Interest Rate (2) Tranche A December 2020 $ 100,000 LIBOR, plus 130 basis points Tranche B June 2021 100,000 LIBOR, plus 130 basis points Tranche C December 2022 100,000 LIBOR, plus 160 basis points Total $ 300,000 (1) Excludes $0.7 million of unamortized deferred financing costs that are deducted from our total unsecured term loan balance in the June 30, 2016 consolidated balance sheet in accordance with ASU 2015-03, which we adopted in the first quarter of 2016. (2) At June 30, 2016 , LIBOR was 0.47% . The interest rate spread is subject to change based on our maximum total indebtedness ratio. For more information, see note 8 (d), Debt – Financial Covenants .

Derivative Instruments (Tables)

Derivative Instruments (Tables)	6 Months Ended
	Jun. 30, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of Interest Rate Swap Agreements	Our interest rate swap agreements are summarized below (dollars in thousands): Maturity Date Notional Amount Interest Rate Contractual Component Fixed LIBOR Interest Rate July 2016 (1) $ 35,000 LIBOR 1.754 % July 2016 (1) 25,000 LIBOR 1.763 % July 2017 30,000 LIBOR 2.093 % July 2017 30,000 LIBOR 2.093 % July 2017 25,000 LIBOR 1.129 % July 2017 12,500 LIBOR 1.129 % July 2017 50,000 LIBOR 0.955 % July 2018 12,500 LIBOR 1.383 % July 2018 30,000 LIBOR 1.660 % July 2018 25,000 LIBOR 1.394 % July 2018 25,000 LIBOR 1.135 % Total/Weighted Average $ 300,000 1.505 % (1) The swap agreements expired on July 18, 2016.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	In accordance with accounting provisions and the fair value hierarchy described above, the following table shows the fair value of our consolidated assets and liabilities that are measured on a non-recurring and recurring basis as of June 30, 2016 and December 31, 2015 (dollars in thousands): Balance at Level 1 Level 2 Level 3 Non-recurring Measurements: Impaired real estate assets $ 55,138 $ — $ 55,138 $ — Recurring Measurements: Derivative instrument-swap liabilities 3,158 — 3,158 — Balance at Level 1 Level 2 Level 3 Non-recurring Measurements: Impaired real estate assets $ 104,625 $ — $ 90,625 $ 14,000 Recurring Measurements: Derivative instrument-swap liabilities 2,491 — 2,491 —
Fair Value of Debt Instruments	The carrying amount and estimated fair value of our notes receivable and debt instruments are as follows (dollars in thousands): June 30, 2016 December 31, 2015 Carrying (3) Fair Carrying (3) Fair Financial Assets: Notes receivable (1) $ — $ — $ 34,000 $ 34,000 Financial Liabilities: Mortgage debt (2) $ 335,492 $ 324,884 $ 312,216 $ 298,541 Unsecured term loan 300,000 300,000 300,000 300,000 Unsecured revolving credit facility 147,000 147,000 120,000 120,000 Total $ 782,492 $ 771,884 $ 732,216 $ 718,541 (1) The note receivable was prepaid on June 2, 2016. See note 5 , Notes Receivable , for more information regarding the prepayment of the note receivable. (2) Includes $22.0 million and $0.2 million of mortgage debt that was classified within “Liabilities held-for-sale” on our consolidated balance sheets at June 30, 2016 and December 31, 2015, respectively. See note 7 , Dispositions, for additional information. (3) In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the respective debt liability and which is applied on a retrospective basis. The debt balances exclude a combined total of $7.1 million and $8.0 million of unamortized deferred financing costs at June 30, 2016 and December 31, 2015, respectively.

Equity (Tables)

Equity (Tables)	6 Months Ended
	Jun. 30, 2016
Equity [Abstract]
Company's Allocation between Non-controlling Interests	Our equity and redeemable noncontrolling interests are as follows (dollars in thousands): First Potomac Realty Trust Non-redeemable noncontrolling interests Total Equity Redeemable noncontrolling interests Balance at December 31, 2015 $ 624,528 $ 800 $ 625,328 $ 28,813 Net loss (1,556 ) (110 ) (1,666 ) (427 ) Changes in ownership, net (141,506 ) — (141,506 ) (1,417 ) Distributions to owners (18,953 ) — (18,953 ) (651 ) Other comprehensive loss, net (632 ) — (632 ) (28 ) Balance at June 30, 2016 $ 461,881 $ 690 $ 462,571 $ 26,290 First Potomac Realty Trust Non-redeemable noncontrolling interests Total Equity Redeemable noncontrolling interests Balance at December 31, 2014 $ 710,007 $ 898 $ 710,905 $ 33,332 Net income (loss) 1,195 (2 ) 1,193 (225 ) Changes in ownership, net 3,219 — 3,219 (1,916 ) Distributions to owners (23,811 ) (96 ) (23,907 ) (788 ) Other comprehensive loss, net (314 ) — (314 ) (14 ) Balance at June 30, 2015 $ 690,296 $ 800 $ 691,096 $ 30,389
Company's Accumulated Other Comprehensive Loss	A summary of our accumulated other comprehensive loss is as follows (dollars in thousands): 2016 2015 Beginning balance at January 1, $ (2,360 ) $ (3,268 ) Net unrealized loss on derivative instruments (660 ) (328 ) Net loss attributable to noncontrolling interests 28 14 Ending balance at June 30, $ (2,992 ) $ (3,582 )

Share-Based Payments (Tables)

Share-Based Payments (Tables)	6 Months Ended
	Jun. 30, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Share Activity	A summary of our non-vested common share awards at June 30, 2016 is as follows: Non-vested Common Shares Weighted Average Grant Date Fair Value Non-vested at March 31, 2016 531,502 $ 10.45 Granted 36,828 8.96 Vested (36,261 ) 10.94 Non-vested at June 30, 2016 532,069 $ 10.31

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2016
Segment Reporting [Abstract]
Summary of Segment Information	The results of operations of our four reporting segments for the three and six months ended June 30, 2016 and 2015 are as follows (dollars in thousands): Three Months Ended June 30, 2016 Washington, D.C. Maryland Northern Virginia Southern Virginia Consolidated Number of buildings (1) 6 34 14 19 73 Square feet (1) 917,241 1,885,759 1,716,904 2,023,858 6,543,762 Total revenues $ 11,580 $ 10,900 $ 8,707 $ 7,306 $ 38,493 Property operating expense (2,563 ) (2,097 ) (2,194 ) (1,689 ) (8,543 ) Real estate taxes and insurance (2,422 ) (960 ) (943 ) (595 ) (4,920 ) Total property operating income $ 6,595 $ 7,843 $ 5,570 $ 5,022 25,030 Depreciation and amortization expense (15,141 ) General and administrative (4,305 ) Impairment of rental property (2,772 ) Other expenses (4,804 ) Net loss $ (1,992 ) Capital expenditures (2) $ 3,287 $ 2,402 $ 12,297 $ 837 $ 18,895 Three Months Ended June 30, 2015 Washington, D.C. Maryland Northern Virginia Southern Virginia Consolidated Number of buildings (1) 6 38 49 19 112 Square feet (1) 914,912 1,997,789 3,020,388 2,023,927 7,957,016 Total revenues $ 11,154 $ 11,034 $ 13,700 $ 7,151 $ 43,039 Property operating expense (2,987 ) (2,645 ) (3,191 ) (1,838 ) (10,661 ) Real estate taxes and insurance (1,956 ) (896 ) (1,345 ) (614 ) (4,811 ) Total property operating income $ 6,211 $ 7,493 $ 9,164 $ 4,699 27,567 Depreciation and amortization expense (16,817 ) General and administrative (4,979 ) Other expenses (5,295 ) Net income $ 476 Capital expenditures (2) $ 3,983 $ 2,153 $ 5,037 $ 910 $ 12,083 Six Months Ended June 30, 2016 Washington, D.C. Maryland Northern Virginia Southern Virginia Consolidated Total revenues $ 22,869 $ 22,488 $ 21,014 $ 14,819 $ 81,190 Property operating expense (5,532 ) (5,329 ) (5,514 ) (3,705 ) (20,080 ) Real estate taxes and insurance (4,794 ) (1,889 ) (2,240 ) (1,213 ) (10,136 ) Total property operating income $ 12,543 $ 15,270 $ 13,260 $ 9,901 50,974 Depreciation and amortization expense (30,147 ) General and administrative (8,884 ) Impairment of rental property (2,772 ) Other expenses (11,264 ) Net loss $ (2,093 ) Total assets (3) $ 503,484 $ 335,932 $ 298,533 $ 163,956 $ 1,320,046 Capital expenditures (2) $ 8,198 $ 3,361 $ 28,054 $ 1,734 $ 41,539 Six Months Ended June 30, 2015 Washington, D.C. Maryland Northern Virginia Southern Virginia Consolidated Total revenues $ 22,186 $ 22,739 $ 27,815 $ 14,148 $ 86,888 Property operating expense (6,126 ) (6,663 ) (7,257 ) (3,729 ) (23,775 ) Real estate taxes and insurance (3,979 ) (1,788 ) (2,894 ) (1,193 ) (9,854 ) Total property operating income $ 12,081 $ 14,288 $ 17,664 $ 9,226 53,259 Depreciation and amortization expense (33,151 ) General and administrative (10,505 ) Other expenses (8,028 ) Loss from discontinued operations (607 ) Net income $ 968 Total assets (3)(4) $ 503,259 $ 356,736 $ 450,324 $ 167,835 $ 1,532,197 Capital expenditures (2) $ 7,419 $ 4,317 $ 15,880 $ 3,400 $ 31,325 (1) Excludes Storey Park from our Washington, D.C. reporting segment, as the property was in development for the periods presented. Storey Park was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016 . On January 1, 2016, we ceased capitalizing expenses associated with the development project as it was being marketed for sale. (2) Capital expenditures for corporate assets not allocated to any of our reportable segments totaled $72 and none for the three months ended June 30, 2016 and 2015 , respectively, and $192 and $309 for the six months ended June 30, 2016 and 2015 , respectively. (3) Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6 , Investment in Affiliates . Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015 , respectively. (4) Total assets at June 30, 2015 have been restated to exclude a total of $5.3 million of unamortized deferred financing costs that are now deducted from the respective debt liability in accordance with ASU 2015-03, which we adopted in the first quarter of 2016.

Description of Business - Addit

Description of Business - Additional Information (Detail)		3 Months Ended
		Jun. 30, 2016ft²joint_venturepersonIntegersegment	Jun. 30, 2015ft²	[2]
Real Estate Properties [Line Items]
Number of Reportable Segments | segment		4
Operating Partnership in preferred		100.00%
Interest in Operating Partnership		95.80%
Area of real estate property	[1]	6,543,762	7,957,016
Unconsolidated joint ventures | joint_venture		5
Square footage of land for additional development		1,300,000
Area Of Land Available For Development In Additional Building Space		1,300,000
Occupancy rate in the Company's consolidated properties		93.10%
Number of tenants representing current occupancy rate | person		385
Square footage in development or redevelopment not included on occupancy calculation		200,000
Percent of Annualized Cash Rent		24.20%
Wholly-owned Properties [Member]
Real Estate Properties [Line Items]
Number of Reportable Segments | Integer		4
Area of real estate property		6,500,000
Unconsolidated Properties [Member]
Real Estate Properties [Line Items]
Area of real estate property		900,000
US Government [Member]
Real Estate Properties [Line Items]
Percent of Annualized Cash Rent		12.50%
Washington D C Reporting Segment [Member]
Real Estate Properties [Line Items]
Area Of Land Available For Development In Additional Building Space		700,000
[1]	Excludes Storey Park from our Washington, D.C. reporting segment, as the property was in development for the periods presented. Storey Park was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016. On January 1, 2016, we ceased capitalizing expenses associated with the development project as it was being marketed for sale.
[2]	Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6, Investment in Affiliates. Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015, respectively.

Summary of Significant Accoun35

Summary of Significant Accounting Policies - Estimated Useful Lives of Company's Assets, by Class (Detail)	3 Months Ended
	Jun. 30, 2016
Property, Plant and Equipment [Line Items]
Useful life	39 years
Lease related intangible assets	the term of the lease
Tenant improvements	Shorter of the useful life of the asset or the term of the related lease
Minimum [Member] | Building improvements
Property, Plant and Equipment [Line Items]
Useful life	5 years
Minimum [Member] | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Useful life	5 years
Maximum [Member] | Building improvements
Property, Plant and Equipment [Line Items]
Useful life	20 years
Maximum [Member] | Furniture, fixtures and equipment
Property, Plant and Equipment [Line Items]
Useful life	15 years

Summary of Significant Accoun36

Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Loans and Leases Receivable Disclosure [Line Items]
Principal payments from note receivable		$ 34,000,000	$ 29,720,000
Notes receivable	$ 0	0		$ 34,000,000
Allowance for credit losses for its notes receivable		$ 0	$ 0
Nine Hundered And Fifty Street Nw [Member]
Loans and Leases Receivable Disclosure [Line Items]
Principal payments from note receivable	$ 34,000,000

Earnings Per Common Share - Com

Earnings Per Common Share - Computation of Company's Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator for basic and diluted earnings per common share:
(Loss) income from continuing operations	$ (1,992)		$ 476	$ (2,093)	$ 1,575
Loss from discontinued operations	0		0	0	(607)
Net (loss) income	(1,992)		476	(2,093)	968
Less: Net loss from continuing operations attributable to noncontrolling interests	390		114	537	201
Less: Net loss from discontinued operations attributable to noncontrolling interests	0		0	0	26
Net (loss) income attributable to First Potomac Realty Trust	(1,602)		590	(1,556)	1,195
Less: Dividends on preferred shares	(794)		(3,100)	(3,042)	(6,200)
Less: Issuance costs of redeemed preferred shares	3,095		0	4,999	0
Net loss attributable to common shareholders	(5,491)		(2,510)	(9,597)	(5,005)
Less: Allocation to participating securities	(53)		(69)	(126)	(142)
Net loss attributable to common shareholders	$ (5,544)		$ (2,579)	$ (9,723)	$ (5,147)
Denominator for basic and diluted earnings per common share:
Basic	57,577		58,280	57,559	58,241
Basic and diluted earnings per common share:
Loss from continuing operations	$ (0.10)		$ (0.04)	$ (0.17)	$ (0.08)
Loss from discontinued operations attributable to common shareholders	0		0	0	(0.01)
Net loss attributable to common shareholders	$ (0.10)		$ (0.04)	$ (0.17)	$ (0.09)
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Stock Redeemed or Called During Period, Shares	3,600	2,200		5,800

Earnings Per Common Share - Ant

Earnings Per Common Share - Anti-Dilutive Shares Not Included in Calculation of Diluted Earnings Per Share (Detail) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, Amount	1,471	1,451	1,505	1,519
Stock option awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, Amount	982	1,046	1,000	1,069
Non-vested share awards
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of earnings per share, Amount	489	405	505	450

Rental Property - Summary of Re

Rental Property - Summary of Rental Property (Detail) - USD ($) $ in Thousands		3 Months Ended	6 Months Ended
		Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Real Estate Investment Property, Net		$ 1,085,108	$ 1,085,108	$ 1,130,266
Rental property, net		1,085,108	1,085,108	1,130,266
Rental Property [Member]
Property, Plant and Equipment [Line Items]
Land and land improvements		279,163	279,163	280,149
Buildings and improvements		800,647	800,647	793,184
Construction in process		45,085	45,085	97,361
Tenant Improvements		191,654	191,654	168,946
Furniture, fixtures and equipment		398	398	410
Rental property, gross		1,316,947	1,316,947	1,340,050
Less: accumulated depreciation		$ 231,839	$ 231,839	209,784
Southern Virginia | Rental Property [Member]
Property, Plant and Equipment [Line Items]
Disposition Date Of Property		Mar. 25, 2016
NOVA Non-Core Portfolio [Member]
Property, Plant and Equipment [Line Items]
Buildings and improvements				88,000
Tenant Improvements				14,400
Disposition Date Of Property	[1]		Mar. 25, 2016
NOVA Non-Core Portfolio [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Rental property, net				$ 90,600
Storey Park [Member]
Property, Plant and Equipment [Line Items]
Disposition Date Of Property	[2]		Jul. 25, 2016
Storey Park [Member] | Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Rental property, net		$ 55,100	$ 55,100
[1]	Consists of Van Buren Office Park, Herndon Corporate Center, Windsor at Battlefield, Reston Business Campus, Enterprise Center, Gateway Centre Manassas, Linden Business Center and Prosperity Business Center (collectively, the “NOVA Non-Core Portfolio”).
[2]	Storey Park was classified as held-for-sale at June 30, 2016.

Rental Property - Additional In

Rental Property - Additional Information (Detail) $ in Thousands		Aug. 31, 2013aft²	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)ft²	Jun. 30, 2016USD ($)ft²	Jun. 30, 2015USD ($)	Jul. 25, 2016USD ($)
Segment Reporting Information [Line Items]
Impairment of rental property | $				$ 2,772	$ 2,772	$ 0
Area Of Land Available For Development In Additional Building Space				1,300,000
Occupancy rate in the Company's consolidated properties				93.10%	93.10%
Placed in-service redevelopment efforts				0
Redevelopment Efforts Yet To Be Placed In Service				0	0
Storey Park [Member]
Segment Reporting Information [Line Items]
Proceeds from sale of properties | $	[1]				$ 52,700
Impairment of rental property | $				$ 2,800
Washington D C Reporting Segment [Member]
Segment Reporting Information [Line Items]
Area Of Land Available For Development In Additional Building Space				700,000
Lease expiration date		Aug. 31, 2013
Development of area for operations by joint venture | a		1.6
Washington D C Reporting Segment [Member] | Maximum [Member] | Greyhound Property [Member]
Segment Reporting Information [Line Items]
Area Of Land Available For Development In Additional Building Space		712,000
Maryland Reporting Segment [Member]
Segment Reporting Information [Line Items]
Area Of Land Available For Development In Additional Building Space				100,000
Northern Virginia
Segment Reporting Information [Line Items]
Area Of Land Available For Development In Additional Building Space				400,000
Area of land placed under development					167,000
Projected incremental investment in development project | $				$ 34,600	$ 34,600
Original cost basis of the property | $				$ 5,200	$ 5,200
Southern Virginia [Member]
Segment Reporting Information [Line Items]
Area Of Land Available For Development In Additional Building Space				100,000
Subsequent Event [Member] | Storey Park [Member]
Segment Reporting Information [Line Items]
Business Combination, Consideration Transferred | $							$ 54,500
Proceeds from sale of properties | $			$ 52,700
[1]	Storey Park was classified as held-for-sale at June 30, 2016.

Notes Receivable - Additional I

Notes Receivable - Additional Information (Detail) $ in Thousands

Apr. 01, 2011

Jun. 30, 2016USD ($)ft²shares

Mar. 31, 2016USD ($)

Jun. 30, 2015USD ($)ft²

Jun. 30, 2016USD ($)ft²shares

Jun. 30, 2015USD ($)ft²

Jul. 06, 2016shares

Dec. 31, 2015USD ($)shares

Feb. 24, 2015USD ($)

Apr. 30, 2011ft²

Receivables with Imputed Interest [Line Items]

Area of real estate property | ft²

[1]

6,543,762

7,957,016

[2]

6,543,762

7,957,016

[2]

Unsecured revolving credit facility, net

$ 144,159

$ 144,159

$ 116,865

Series A Preferred Shares, shares outstanding | shares

600,000

600,000

6,400,000

Interest income

$ 800

$ 800

$ 1,600

$ 2,000

America Square [Member]

Receivables with Imputed Interest [Line Items]

Area of real estate property | ft²

461,000

Loans Receivable, Gross, Commercial, Real Estate

$ 29,700

Maturity date of loan

Apr. 1, 2017

May 1, 2016

Prepayment Fee Income

$ 2,400

America Square [Member] | Maximum [Member]

Receivables with Imputed Interest [Line Items]

Fixed interest rate on loan

9.00%

Nine Hundered And Fifty Street Nw [Member]

Receivables with Imputed Interest [Line Items]

Area of real estate property | ft²

287,000

287,000

Recognition of Deferred Revenue

$ 200

Nine Hundered And Fifty Street Nw [Member] | Minimum [Member]

Receivables with Imputed Interest [Line Items]

Fixed interest rate on loan

9.75%

Series A Preferred Stock [Member]

Receivables with Imputed Interest [Line Items]

Series A Preferred Shares, shares outstanding | shares

6,400,000

Subsequent Event [Member] | Series A Preferred Stock [Member]

Receivables with Imputed Interest [Line Items]

Series A Preferred Shares, shares outstanding | shares

600,000

[1]

Excludes Storey Park from our Washington, D.C. reporting segment, as the property was in development for the periods presented. Storey Park was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016. On January 1, 2016, we ceased capitalizing expenses associated with the development project as it was being marketed for sale.

[2]

Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6, Investment in Affiliates. Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015, respectively.

Investment in Affiliates - Comp

Investment in Affiliates - Components of Investments in Affiliates (Detail) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2016	Dec. 31, 2015	Aug. 04, 2011
Schedule of Equity Method Investments [Line Items]
Ownership Interest				97.00%
Company Investment		$ 48,715	$ 48,223
Prosperity Metro Plaza [Member]
Schedule of Equity Method Investments [Line Items]
Reporting Segment		Northern Virginia
Ownership Interest	[1]	51.00%
Company Investment		$ 25,678	24,909
One Thousand Seven Hundred Fifty H Street Nw [Member]
Schedule of Equity Method Investments [Line Items]
Reporting Segment		Washington, D.C.
Ownership Interest	[2]	50.00%
Company Investment		$ 14,870	15,168
Aviation Business Park
Schedule of Equity Method Investments [Line Items]
Reporting Segment		Maryland
Ownership Interest		50.00%
Company Investment		$ 5,847	5,899
Rivers Park One And Two [Member]
Schedule of Equity Method Investments [Line Items]
Reporting Segment	[3]	Maryland
Ownership Interest	[3],[4]	25.00%
Company Investment	[3]	$ 2,320	$ 2,247
Mortgages [Member] | Rivers Park One And Two [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 2,800
[1]	The loan requires interest-only payments through December 2024, at which time the loan requires principal and interest payments through its maturity date. The loan is repayable in full without penalty on or after June 1, 2029.
[2]	The loan requires interest-only payments with a constant interest rate over the life of the loan. The loan is repayable in full, without penalty, on or after August 1, 2021.
[3]	I and Rivers Park II are owned through two separate joint ventures.
[4]	The loan is repayable in full, without penalty, at any time during the term of the loan. Of the outstanding principal balance, $2.8 million is recourse to us. We believe the fair value of the potential liability to us related to the recourse debt is inconsequential as the likelihood of our need to perform under the debt agreement is remote.

Investment in Affiliates - Net

Investment in Affiliates - Net Assets of Company's Unconsolidated Joint Ventures (Detail) - USD ($) $ in Thousands		Jun. 30, 2016		Dec. 31, 2015	Jun. 30, 2015		Dec. 31, 2013
Assets:
Rental property, net		$ 1,085,108		$ 1,130,266
Cash and cash equivalents		13,703		13,527	$ 12,735		$ 13,323
Total assets		1,320,046	[1]	1,442,406	1,532,197	[1],[2]
Liabilities:
Total liabilities		831,185		788,265
Recourse mortgage debt		753,377		724,038
Debt Issuance Costs, Line of Credit Arrangements, Net		2,800			$ 5,300
Unconsolidated Joint Ventures [Member]
Assets:
Rental property, net		191,068		193,243
Cash and cash equivalents		7,493		5,992
Other assets		17,775		16,490
Total assets		216,336		215,725
Liabilities:
Mortgage loans	[3]	109,322		109,273
Other liabilities		6,665		7,214
Total liabilities		115,987		116,487
Net assets		100,349		99,238
Debt Issuance Costs, Line of Credit Arrangements, Net				$ 700
Unconsolidated Entities
Liabilities:
Recourse mortgage debt		$ 2,800
[1]	Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6, Investment in Affiliates. Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015, respectively.
[2]	Total assets at June 30, 2015 have been restated to exclude a total of $5.3 million of unamortized deferred financing costs that are now deducted from the respective debt liability in accordance with ASU 2015-03, which we adopted in the first quarter of 2016.
[3]	Of the total mortgage debt that encumbers our unconsolidated properties, $2.8 million is recourse to us. We believe the fair value of the potential liability to us under this guaranty is inconsequential as the likelihood of our need to perform under the debt agreement is remote.

Investment in Affiliates - Addi

Investment in Affiliates - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity Method Investments and Joint Ventures [Abstract]
Fees from joint ventures	$ 0.2	$ 0.2	$ 0.4	$ 0.3

Investment in Affiliates - Resu

Investment in Affiliates - Results of Operations of Company's Unconsolidated Joint Ventures (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Schedule of Equity Method Investments [Line Items]
Total revenues	$ 38,493	$ 43,039	$ 81,190	$ 86,888
Total operating expenses	(35,681)	(37,268)	(72,019)	(77,285)
Operating income	2,812	5,771	9,171	9,603
Depreciation and amortization	(15,141)	(16,817)	(30,147)	(33,151)
Interest expense, net	(4,804)	(5,295)	(11,264)	(8,028)
Net income	663	456	1,219	803
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Total revenues	6,240	6,063	12,529	12,230
Total operating expenses	(1,814)	(1,756)	(3,980)	(3,912)
Operating income	4,426	4,307	8,549	8,318
Depreciation and amortization	(2,006)	(2,287)	(3,972)	(4,536)
Interest expense, net	(997)	(975)	(1,989)	(1,948)
Net income	$ 1,423	$ 1,045	$ 2,588	$ 1,834

Investment in Affiliates Invest

Investment in Affiliates Investment in Affiliates - Mortgage Debt Held by Unconsolidated Joint Ventures (Details) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Aug. 04, 2011
Schedule of Equity Method Investments [Line Items]
Debt Issuance Costs, Line of Credit Arrangements, Net		$ 2,800		$ 5,300
Total long term debt		$ 753,377	$ 724,038
Ownership Interest					97.00%
Unconsolidated Joint Ventures [Member]
Schedule of Equity Method Investments [Line Items]
Debt Issuance Costs, Line of Credit Arrangements, Net			700
Rivers Park One And Two [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest	[1],[2]	25.00%
One Thousand Seven Hundred Fifty H Street Nw [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest	[3]	50.00%
Prosperity Metro Plaza [Member]
Schedule of Equity Method Investments [Line Items]
Ownership Interest	[4]	51.00%
Mortgages [Member]
Schedule of Equity Method Investments [Line Items]
Total long term debt	[5]	$ 110,000	110,000
Effective Interest Rate		3.52%
Mortgages [Member] | Rivers Park One And Two [Member]
Schedule of Equity Method Investments [Line Items]
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 2,800
Mortgage and Other Indebtedness	[2],[5]	28,000	28,000
Mortgages [Member] | One Thousand Seven Hundred Fifty H Street Nw [Member]
Schedule of Equity Method Investments [Line Items]
Mortgage and Other Indebtedness	[3],[5]	$ 32,000	32,000
Effective Interest Rate	[3]	3.92%
Mortgages [Member] | Prosperity Metro Plaza [Member]
Schedule of Equity Method Investments [Line Items]
Mortgage and Other Indebtedness	[4],[5]	$ 50,000	$ 50,000
Effective Interest Rate	[4]	3.91%
London Interbank Offered Rate (LIBOR) [Member]
Schedule of Equity Method Investments [Line Items]
Effective Interest Rate		0.47%
London Interbank Offered Rate (LIBOR) [Member] | Mortgages [Member] | Rivers Park One And Two [Member]
Schedule of Equity Method Investments [Line Items]
Interest Rate	[6]	LIBOR
Derivative, Basis Spread on Variable Rate		1.90%
[1]	I and Rivers Park II are owned through two separate joint ventures.
[2]	The loan is repayable in full, without penalty, at any time during the term of the loan. Of the outstanding principal balance, $2.8 million is recourse to us. We believe the fair value of the potential liability to us related to the recourse debt is inconsequential as the likelihood of our need to perform under the debt agreement is remote.
[3]	The loan requires interest-only payments with a constant interest rate over the life of the loan. The loan is repayable in full, without penalty, on or after August 1, 2021.
[4]	The loan requires interest-only payments through December 2024, at which time the loan requires principal and interest payments through its maturity date. The loan is repayable in full without penalty on or after June 1, 2029.
[5]	Reflects the entire balance of the debt secured by the properties, not our portion of the debt.
[6]	At June 30, 2016, LIBOR was 0.47%. All references to LIBOR in the condensed consolidated financial statements refer to one-month LIBOR.

Dispositions - Additional Infor

Dispositions - Additional Information (Detail) - USD ($) $ in Thousands

3 Months Ended

6 Months Ended

Jun. 30, 2016

Mar. 31, 2016

Jun. 30, 2015

Mar. 31, 2015

Jun. 30, 2016

Jun. 30, 2015

Dec. 31, 2015

SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]

Gain (Loss) on Sale of Properties

$ 0

$ (1,200)

$ 0

$ (1,155)

$ 0

Assets

1,320,046

[1]

$ 1,532,197

[1],[2]

1,320,046

[1]

$ 1,532,197

[1],[2]

$ 1,442,406

NOVA Non-Core Portfolio [Member]

SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]

Proceeds from sale of properties

52,700

$ 90,500

90,501

[3]

Land and Land Improvements

25,200

Buildings and improvements

88,000

Tenant Improvements

14,400

Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment

$ 37,000

Storey Park [Member]

SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]

Proceeds from sale of properties

[4]

52,700

Assets

55,100

55,100

Land

43,300

43,300

Mortgage loans, net, effective interest rates ranging from 4.22% to 6.01%, maturing at various dates through September 2030(3)(4)

22,000

22,000

Other liabilities

$ 2,500

$ 2,500

Noncontrolling Interest, Description

0.03

Richmond [Member]

SEC Schedule III, Real Estate and Accumulated Depreciation [Line Items]

Proceeds from sale of properties

[5]

$ 53,768

[1]

Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6, Investment in Affiliates. Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015, respectively.

[2]

Total assets at June 30, 2015 have been restated to exclude a total of $5.3 million of unamortized deferred financing costs that are now deducted from the respective debt liability in accordance with ASU 2015-03, which we adopted in the first quarter of 2016.

[3]

Consists of Van Buren Office Park, Herndon Corporate Center, Windsor at Battlefield, Reston Business Campus, Enterprise Center, Gateway Centre Manassas, Linden Business Center and Prosperity Business Center (collectively, the “NOVA Non-Core Portfolio”).

[4]

Storey Park was classified as held-for-sale at June 30, 2016.

[5]

Consists of Chesterfield Business Center, Hanover Business Center, Park Central, Virginia Technology Center and a three-acre parcel of undeveloped land (collectively, the “Richmond Portfolio”).

Dispositions Dispositions - Dis

Dispositions Dispositions - Disposed or Held-for-Sale Properties within Continuing Operations (Details) $ in Thousands

Jul. 25, 2016

Sep. 30, 2016USD ($)

Jun. 30, 2016USD ($)ft²

Mar. 31, 2016USD ($)

Jun. 30, 2015USD ($)ft²

Jun. 30, 2016USD ($)ft²

Jun. 30, 2015USD ($)ft²

Dec. 31, 2015USD ($)ft²

Sep. 30, 2015ft²

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Square feet | ft²

[1]

6,543,762

7,957,016

[2]

6,543,762

7,957,016

[2]

Gain (Loss) on Extinguishment of Debt

$ 0

$ 0

$ (48)

$ 0

Impairment of rental property

2,772

0

2,772

0

Gain (Loss) on Sale of Properties

$ 0

$ (1,200)

0

$ (1,155)

0

Storey Park [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Reporting Segment

[3]

Washington, D.C.

Disposition Date Of Property

[3]

Jul. 25, 2016

Property Type

[3]

Land

Square feet | ft²

[3]

712,000

712,000

Proceeds from sale of properties

[3]

$ 52,700

Rumsey Center [Domain]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Reporting Segment

Maryland

Disposition Date Of Property

Jul. 28, 2015

Property Type

Business Park

Square feet | ft²

135,015

Proceeds from sale of properties

$ 14,956

Newington Business Park Center [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Reporting Segment

Northern Virginia

Disposition Date Of Property

Dec. 17, 2015

Property Type

Industrial

Square feet | ft²

255,600

Proceeds from sale of properties

$ 31,409

NOVA Non-Core Portfolio [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Reporting Segment

[4]

Northern Virginia

Disposition Date Of Property

[4]

Mar. 25, 2016

Property Type

[4]

Various

Square feet | ft²

[4]

945,745

945,745

Proceeds from sale of properties

$ 52,700

$ 90,500

$ 90,501

[4]

Land and Land Improvements

$ 25,200

Tenant Improvements

14,400

Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment

$ 37,000

Cedar Hill I and III [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Reporting Segment

Northern Virginia

Disposition Date Of Property

Dec. 23, 2015

Property Type

Office

Square feet | ft²

102,632

Proceeds from sale of properties

$ 25,939

Disposed or held-for-sale properties in continuing operations | Continuing Operations

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Revenues

0

5,537

3,366

11,655

Property operating expenses

(221)

(1,999)

(1,849)

(4,553)

Depreciation and amortization

0

(1,880)

(114)

(3,792)

Interest Expense

(208)

(203)

(392)

(412)

Gain (Loss) on Extinguishment of Debt

0

0

(48)

0

Impairment of rental property

[5]

2,772

0

2,772

0

Operating Income (Loss) from Continuing Operations Attributable to Parent

(3,201)

1,455

(1,809)

2,898

Gain (Loss) on Sale of Properties

0

0

(1,155)

[6]

0

Net (loss) income from continuing operations

$ (3,201)

$ 1,455

(2,964)

$ 2,898

Disposed or held-for-sale properties in continuing operations | NOVA Non-Core Portfolio [Member] | Continuing Operations

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Impairment of rental property

[5]

$ 1,200

Subsequent Event [Member] | Storey Park [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disposition Date Of Property

Jul. 25, 2016

Proceeds from sale of properties

$ 52,700

Subsequent Event [Member] | Storey Park [Member]

Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]

Disposition Date Of Property

Jul. 25, 2016

[1]

Excludes Storey Park from our Washington, D.C. reporting segment, as the property was in development for the periods presented. Storey Park was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016. On January 1, 2016, we ceased capitalizing expenses associated with the development project as it was being marketed for sale.

[2]

Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6, Investment in Affiliates. Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015, respectively.

[3]

Storey Park was classified as held-for-sale at June 30, 2016.

[4]

Consists of Van Buren Office Park, Herndon Corporate Center, Windsor at Battlefield, Reston Business Campus, Enterprise Center, Gateway Centre Manassas, Linden Business Center and Prosperity Business Center (collectively, the “NOVA Non-Core Portfolio”).

[5]

During the second quarter of 2016, we recorded an impairment charge related to Storey Park based on the anticipated sales price less estimated selling costs. The property was sold on July 25, 2016.

[6]

During the first quarter of 2016, we recorded a $1.2 million loss on the sale of the NOVA Non-Core Portfolio.

Dispositions - Summary of Compl

Dispositions - Summary of Completed Property Dispositions (Detail) $ in Thousands		3 Months Ended
		Mar. 31, 2015USD ($)ft²	Jun. 30, 2016ft²	Jun. 30, 2015ft²	[2]
Schedule Of Discontinued Operations [Line Items]
Square feet	[1]		6,543,762	7,957,016
Richmond [Member]
Schedule Of Discontinued Operations [Line Items]
Reporting Segment	[3]	Southern Virginia
Disposition Date Of Property	[3]	Mar. 19, 2015
Property Type	[3]	Business Park
Square feet	[3]	827,900
Proceeds from sale of properties | $	[3]	$ 53,768
[1]	Excludes Storey Park from our Washington, D.C. reporting segment, as the property was in development for the periods presented. Storey Park was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016. On January 1, 2016, we ceased capitalizing expenses associated with the development project as it was being marketed for sale.
[2]	Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6, Investment in Affiliates. Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015, respectively.
[3]	Consists of Chesterfield Business Center, Hanover Business Center, Park Central, Virginia Technology Center and a three-acre parcel of undeveloped land (collectively, the “Richmond Portfolio”).

Dispositions - Net (Loss) Incom

Dispositions - Net (Loss) Income from Discontinued Operations (Detail) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Mar. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Loss on debt extinguishment		$ 0	$ 0		$ 0	$ (489)
Richmond [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Accelerated Amount Of Straight Line Rent				$ 2,000
Discontinued Operations [Member] | All properties classified within discontinued operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Revenues						877
Loss from operations, before taxes	[1]					(975)
Loss on debt extinguishment						(489)
Gain on sale of rental property						$ 857
[1]	(1) For the first quarter of 2015, we accelerated $2.0 million of unamortized straight-line rents, deferred rent abatements and leasing commissions related to the sale of the Richmond Portfolio.

Debt - Schedule of Borrowings (

Debt - Schedule of Borrowings (Detail) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Debt Issuance Costs, Net		$ 7,100	$ 8,000
Mortgage loans, net		309,879	307,769
Unsecured Debt		299,339	299,404
Unsecured revolving credit facility, net		144,159	116,865
Total long term debt		$ 753,377	724,038
Mortgage Loan [Member]
Debt Instrument [Line Items]
Debt instrument maturity date		June 2,030
Unsecured Term Loan, Effective Interest Rates Ranging from LIBOR Plus 1.45% to LIBOR Plus 1.90%, with Staggered Maturity Dates ranging from October 2018 to October 2020
Debt Instrument [Line Items]
Unsecured Debt		$ 299,339	299,404
Debt instrument maturity date		December 2020 to December 2022
Debt Instrument Basis Spread On Variable Rate Minimum		1.30%
Debt Instrument Basis Spread On Variable Rate Maximum		1.60%
Unsecured revolving credit facility
Debt Instrument [Line Items]
Unsecured revolving credit facility, net, effective interest rate of LIBOR plus 1.35%, maturing December 2019(3)		$ 147,000
Effective interest rate on the notes		1.35%
Debt instrument maturity date		December 2,019
Minimum [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Effective interest rate on the notes		4.22%
Maximum [Member] | Mortgage Loan [Member]
Debt Instrument [Line Items]
Effective interest rate on the notes		6.01%
NOVA Non-Core Portfolio [Member]
Debt Instrument [Line Items]
Disposition Date Of Property	[1]	Mar. 25, 2016
Mortgage and Other Indebtedness			$ 200
[1]	Consists of Van Buren Office Park, Herndon Corporate Center, Windsor at Battlefield, Reston Business Campus, Enterprise Center, Gateway Centre Manassas, Linden Business Center and Prosperity Business Center (collectively, the “NOVA Non-Core Portfolio”).

Debt - Summary of Company's Mor

Debt - Summary of Company's Mortgage Debt (Detail) - USD ($) $ in Thousands		3 Months Ended
		Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Aug. 04, 2011
Debt Instrument [Line Items]
Ownership Interest					97.00%
Debt, Weighted Average Interest Rate		0.00%
Unamortized fair value adjustments		$ 77		$ 172
Carrying amount of mortgages		$ 22,000		213
Gateway Centre Building One Debt [Member]
Debt Instrument [Line Items]
Mortgage and Other Indebtedness			$ 200
Contractual Interest Rate		7.35%
Effective Interest Rate		5.88%
Maturity Date		November 2016
Total Mortgage Debt	[1]	$ 0		212
Effective Interest Rate		5.88%
440 First Street, NW Construction Loan
Debt Instrument [Line Items]
Contractual Interest Rate		2.50%
Contractual Interest Rate	[2]	LIBOR + 2.50%
Maturity Date		May 30, 2017
Percentage Of Principal Loan Amount And Unpaid Accrued Interest Recourse		50.00%
Total Mortgage Debt	[3]	$ 32,216		32,216
Storey Park [Member]
Debt Instrument [Line Items]
Ownership Interest		97.00%
Guarantor Obligations, Maximum Exposure, Undiscounted		$ 6,000
Contractual Interest Rate		2.50%
Contractual Interest Rate	[2]	LIBOR + 2.50%
Maturity Date		October 2,016
Total Mortgage Debt	[4]	$ 0		22,000
Hillside I and II
Debt Instrument [Line Items]
Contractual Interest Rate		0.00%
Effective Interest Rate		0.00%
Maturity Date		December 2,016
Total Mortgage Debt		$ 12,256		12,368
Effective Interest Rate		0.00%
Redland Corporate Center Buildings II & III
Debt Instrument [Line Items]
Contractual Interest Rate		0.00%
Effective Interest Rate		0.00%
Maturity Date		November 2,017
Total Mortgage Debt		$ 63,885		64,543
Effective Interest Rate		0.00%
840 First Street, NE
Debt Instrument [Line Items]
Contractual Interest Rate		0.00%
Effective Interest Rate		0.00%
Maturity Date		July 2,020
Total Mortgage Debt		$ 35,550		35,888
Effective Interest Rate		0.00%
Battlefield Corporate Center
Debt Instrument [Line Items]
Contractual Interest Rate		0.00%
Effective Interest Rate		0.00%
Maturity Date		November 2,020
Total Mortgage Debt		$ 3,441		3,526
Effective Interest Rate		0.00%
One thousand two hundred eleven Connecticut Avenue NW. [Member]
Debt Instrument [Line Items]
Contractual Interest Rate		0.00%
Effective Interest Rate		0.00%
Maturity Date		July 2,022
Total Mortgage Debt		$ 28,810		29,110
Effective Interest Rate		0.00%
1401 K Street, NW
Debt Instrument [Line Items]
Contractual Interest Rate		0.00%
Effective Interest Rate		0.00%
Maturity Date		June 1, 2023
Total Mortgage Debt		$ 35,894		36,224
Effective Interest Rate		0.00%
Eleven Dupont Circle [Member]
Debt Instrument [Line Items]
Contractual Interest Rate		0.00%
Effective Interest Rate		0.00%
Maturity Date		September 2,030
Total Mortgage Debt		$ 66,780		66,780
Effective Interest Rate		0.00%
Northern Virginia Development Project [Member]
Debt Instrument [Line Items]
Contractual Interest Rate		1.85%
Contractual Interest Rate	[2]	LIBOR + 1.85%
Maturity Date		September 2,019
Total Mortgage Debt		$ 34,583		9,176
Storey Park [Member]
Debt Instrument [Line Items]
Ownership Interest		97.00%
Mortgage and Other Indebtedness		$ 22,000
Total Mortgage Debt		22,000
Continuing Operations
Debt Instrument [Line Items]
Total Mortgage Debt		313,415		311,831
Unamortized fair value adjustments	[5]	(3,613)		(4,234)
Carrying amount of mortgages		$ 309,879		307,769
Mortgages [Member]
Debt Instrument [Line Items]
Effective Interest Rate		3.52%
Effective Interest Rate		3.52%
Storey Park [Member]
Debt Instrument [Line Items]
Total Mortgage Debt	[4]	$ 22,000		0
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Debt Instrument [Line Items]
Unamortized fair value adjustments		$ 0		$ 1
[1]	The mortgage loan that encumbered Gateway Centre Manassas, which was included in the NOVA Non-Core Portfolio and sold on March 25, 2016, was classified within “Liabilities held-for-sale” on our December 31, 2015 consolidated balance sheet. In February 2016, we used $0.2 million in available cash to defease the outstanding balance of the mortgage loan.
[2]	At June 30, 2016, LIBOR was 0.47%.
[3]	This construction loan (the “440 First Street, NW Construction Loan”) is collateralized by 440 First Street, NW. In May 2016, we extended the maturity date one year to May 30, 2017. We can repay all or a portion of the construction loan, without penalty, at any time during the term of the loan. At June 30, 2016, per the terms of the loan agreement, 50% of the outstanding principal balance and all of the outstanding accrued interest were recourse to us.
[4]	This construction loan (the “440 First Street, NW Construction Loan”) is collateralized by 440 First Street, NW. In May 2016, we extended the maturity date one year to May 30, 2017. We can repay all or a portion of the construction loan, without penalty, at any time during the term of the loan. At June 30, 2016, per the terms of the loan agreement, 50% of the outstanding principal balance and all of the outstanding accrued interest were recourse to us.
[5]	In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented on the balance sheet as a direct deduction from the carrying value of the respective debt liability and is applied on a retrospective basis.

Debt - Additional Information (

Debt - Additional Information (Detail) $ in Thousands

Jul. 25, 2016USD ($)

Apr. 27, 2016USD ($)

Sep. 30, 2016USD ($)shares

Jun. 30, 2016USD ($)TranchesRateshares

Mar. 31, 2016USD ($)shares

Jun. 30, 2015USD ($)

Jun. 30, 2016USD ($)shares

Jun. 30, 2015USD ($)

Jul. 28, 2016USD ($)

Jul. 18, 2016USD ($)

Jul. 06, 2016shares

Jun. 30, 2016USD ($)

Jun. 30, 2016

Jun. 30, 2016Integer

Jun. 30, 2016Rate

Jun. 30, 2016Interest_Rate_Swaps

Dec. 31, 2015USD ($)shares

Debt Instrument [Line Items]

Amount borrowed

$ 103,000

Basis spread over variable rate | Rate

1.35%

Recourse mortgage debt

$ 753,377

$ 724,038

Proceed to pay loan

$ 151,036

$ 84,883

Interest rate during period

1.80%

1.90%

Average interest rate at prior period end

1.90%

Maximum outstanding borrowings

$ 204,000

$ 156,000

$ 218,000

Weighted average interest rate

1.80%

Available capacity on the unsecured revolving credit facility

161,100

Annual commitment fee

0.15%

Number of interest rate swap agreements

11

11

Fixed effective interest rate

1.50%

Payments for Repurchase of Redeemable Preferred Stock

$ 145,000

0

Line of Credit Facility, Increase (Decrease), Net

$ 13,000

Principal payments from note receivable

$ 34,000

29,720

Series A Preferred Shares, shares outstanding | shares

600,000

600,000

6,400,000

Debt Issuance Costs, Line of Credit Arrangements, Net

5,300

5,300

2,800

Unsecured Debt

299,339

$ 299,404

Unsecured term loan

Debt Instrument [Line Items]

Outstanding balance of three tranches

[1]

300,000

Unsecured term loan

Debt Instrument [Line Items]

Number of tranches | Tranches

3

Unsecured Debt

300,000

Unsecured revolving credit facility

Debt Instrument [Line Items]

Unsecured revolving credit facility, net, effective interest rate of LIBOR plus 1.35%, maturing December 2019(3)

147,000

Proceed to pay loan

$ 57,000

Line of Credit Facility, Increase (Decrease), Net

5,000

Tranche A | Unsecured term loan

Debt Instrument [Line Items]

Outstanding balance of three tranches

[1]

100,000

Northern Virginia Development Project [Member]

Debt Instrument [Line Items]

Mortgage loans, net, effective interest rates ranging from 4.22% to 6.01%, maturing at various dates through September 2030(3)(4)

34,583

9,176

Debt Instrument, Interest Rate, Stated Percentage

1.85%

Line of Credit Facility, Increase (Decrease), Net

18,000

440 First Street, NW Construction Loan

Debt Instrument [Line Items]

Mortgage loans, net, effective interest rates ranging from 4.22% to 6.01%, maturing at various dates through September 2030(3)(4)

[2]

32,216

$ 32,216

Debt Instrument, Interest Rate, Stated Percentage

2.50%

Percentage of outstanding principal

50.00%

Tranche C | Unsecured term loan

Debt Instrument [Line Items]

Outstanding balance of three tranches

[1]

100,000

Interest Rate Swap

Debt Instrument [Line Items]

Fixed effective interest rate

1.505%

0.00%

Amount on variable rate debt

300,000

Unused lines of credit

Debt Instrument [Line Items]

Weighted average borrowings outstanding on unsecured revolving credit facility

162,300

$ 149,400

$ 165,900

$ 171,300

NOVA Non-Core Portfolio

Debt Instrument [Line Items]

Proceeds from sale of properties

52,700

$ 90,500

$ 90,501

[3]

Northern Virginia Development Project [Member]

Debt Instrument [Line Items]

Borrowing capacity of a construction loan

$ 43,700

Nine Hundered And Fifty Street Nw [Member]

Debt Instrument [Line Items]

Principal payments from note receivable

$ 34,000

Subsequent Event [Member]

Debt Instrument [Line Items]

Amount borrowed

$ 15,000

Subsequent Event [Member] | Unsecured revolving credit facility

Debt Instrument [Line Items]

Unsecured revolving credit facility, net, effective interest rate of LIBOR plus 1.35%, maturing December 2019(3)

$ 135,000

Proceed to pay loan

$ 27,000

Subsequent Event [Member] | Tranche A

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Increase (Decrease)

0.00%

Subsequent Event [Member] | Tranche C

Debt Instrument [Line Items]

Debt Instrument, Interest Rate, Increase (Decrease)

0.00%

Subsequent Event [Member] | Interest Rate Swap

Debt Instrument [Line Items]

Fixed effective interest rate

1.80%

Amount on variable rate debt

$ 60,000

Series A Preferred Stock [Member]

Debt Instrument [Line Items]

Stock Redeemed or Called During Period, Shares | shares

3,600,000

2,200,000

5,800,000

Payments for Repurchase of Redeemable Preferred Stock

$ 90,000

Series A Preferred Shares, shares outstanding | shares

6,400,000

Series A Preferred Stock [Member] | Subsequent Event [Member]

Debt Instrument [Line Items]

Stock Redeemed or Called During Period, Shares | shares

600,000

Series A Preferred Shares, shares outstanding | shares

600,000

Maximum [Member]

Debt Instrument [Line Items]

Annual commitment fee

0.25%

[1]

Excludes $0.7 million of unamortized deferred financing costs that are deducted from our total unsecured term loan balance in the June 30, 2016 consolidated balance sheet in accordance with ASU 2015-03, which we adopted in the first quarter of 2016.

[2]

This construction loan (the “440 First Street, NW Construction Loan”) is collateralized by 440 First Street, NW. In May 2016, we extended the maturity date one year to May 30, 2017. We can repay all or a portion of the construction loan, without penalty, at any time during the term of the loan. At June 30, 2016, per the terms of the loan agreement, 50% of the outstanding principal balance and all of the outstanding accrued interest were recourse to us.

[3]

Consists of Van Buren Office Park, Herndon Corporate Center, Windsor at Battlefield, Reston Business Campus, Enterprise Center, Gateway Centre Manassas, Linden Business Center and Prosperity Business Center (collectively, the “NOVA Non-Core Portfolio”).

Debt - Unsecured Term Loan (Det

Debt - Unsecured Term Loan (Detail) $ in Thousands	3 Months Ended
	Jun. 30, 2016USD ($)
Tranche A
Debt Instrument [Line Items]
Maturity Date	December 2,020
Interest Rate	LIBOR, plus 130 basis points	[1]
Basis spread over variable rate	1.30%
Tranche B
Debt Instrument [Line Items]
Maturity Date	June 2,021
Interest Rate	LIBOR, plus 130 basis points	[1]
Basis spread over variable rate	1.30%
Tranche C
Debt Instrument [Line Items]
Maturity Date	December 2,022
Interest Rate	LIBOR, plus 160 basis points	[1]
Basis spread over variable rate	1.60%
Unsecured term loan
Debt Instrument [Line Items]
Carrying value of the debt instruments	$ 300,000	[2]
Unsecured term loan | Tranche A
Debt Instrument [Line Items]
Carrying value of the debt instruments	100,000	[2]
Unsecured term loan | Tranche B
Debt Instrument [Line Items]
Carrying value of the debt instruments	100,000	[2]
Unsecured term loan | Tranche C
Debt Instrument [Line Items]
Carrying value of the debt instruments	$ 100,000	[2]
[1]	At June 30, 2016, LIBOR was 0.47%. The interest rate spread is subject to change based on our maximum total indebtedness ratio. For more information, see note 8(d), Debt – Financial Covenants.
[2]	Excludes $0.7 million of unamortized deferred financing costs that are deducted from our total unsecured term loan balance in the June 30, 2016 consolidated balance sheet in accordance with ASU 2015-03, which we adopted in the first quarter of 2016.

Derivative Instruments - Summar

Derivative Instruments - Summary of Interest Rate Swap Agreements (Detail) - 3 months ended Jun. 30, 2016 - USD ($) $ in Thousands		Total	Total	Total
Derivatives, Fair Value [Line Items]
Fixed LIBOR Interest Rate			1.50%
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional Amount		$ 300,000
Fixed LIBOR Interest Rate			1.505%	0.00%
Interest Rate Swap One
Derivatives, Fair Value [Line Items]
Maturity Date	[1]	Jul. 31, 2016
Notional Amount		$ 35,000
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Two
Derivatives, Fair Value [Line Items]
Maturity Date	[1]	Jul. 31, 2016
Notional Amount		$ 25,000
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Three
Derivatives, Fair Value [Line Items]
Maturity Date		Jul. 31, 2017
Notional Amount		$ 30,000
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Four
Derivatives, Fair Value [Line Items]
Maturity Date		Jul. 31, 2017
Notional Amount		$ 30,000
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Five
Derivatives, Fair Value [Line Items]
Maturity Date		Jul. 31, 2017
Notional Amount		$ 25,000
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Six
Derivatives, Fair Value [Line Items]
Maturity Date		Jul. 31, 2017
Notional Amount		$ 12,500
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Seven [Member]
Derivatives, Fair Value [Line Items]
Maturity Date		Jul. 31, 2017
Notional Amount		$ 50,000
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Eight [Member]
Derivatives, Fair Value [Line Items]
Maturity Date		Jul. 31, 2018
Notional Amount		$ 12,500
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Nine [Member]
Derivatives, Fair Value [Line Items]
Maturity Date		Jul. 31, 2018
Notional Amount		$ 30,000
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Ten [Member]
Derivatives, Fair Value [Line Items]
Maturity Date		Jul. 31, 2018
Notional Amount		$ 25,000
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
Interest Rate Swap Eleven
Derivatives, Fair Value [Line Items]
Maturity Date		Jul. 31, 2018
Notional Amount		$ 25,000
Interest Rate Contractual Component		LIBOR
Fixed LIBOR Interest Rate				0.00%
[1]	The swap agreements expired on July 18, 2016.

Derivative Instruments - Additi

Derivative Instruments - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016	Jun. 30, 2016Integer	Jun. 30, 2016Rate	Jun. 30, 2016Interest_Rate_Swaps
Derivatives, Fair Value [Line Items]
Number of interest rate swap agreements						11		11
Fixed effective interest rate					1.50%
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Fixed effective interest rate					1.505%		0.00%
Amount on variable rate debt	$ 300,000		$ 300,000
Interest Rate Swap | Interest Expense
Derivatives, Fair Value [Line Items]
Accumulated other comprehensive loss reclassified as an increase in interest expense	$ 800	$ 1,000	1,600	$ 2,000
Estimated accumulated other comprehensive loss reclassified as an increase in interest expense over the following twelve months			$ 2,300

Fair Value Measurements - Fair

Fair Value Measurements - Fair Value of Assets and Liabilities (Detail) - Recurring Measurements - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Recurring Measurements:
Derivative instrument-swap liabilities	$ 3,158	$ 2,491
Assets, Fair Value Disclosure, Nonrecurring	55,138	104,625
Level 1
Recurring Measurements:
Derivative instrument-swap assets	0	0
Derivative instrument-swap liabilities	0	0
Level 2
Recurring Measurements:
Derivative instrument-swap assets	55,138	90,625
Derivative instrument-swap liabilities	3,158	2,491
Level 3
Recurring Measurements:
Derivative instrument-swap assets	0	14,000
Derivative instrument-swap liabilities	$ 0	$ 0

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Detail) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2016USD ($)snapshot	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)	Jun. 30, 2015USD ($)	Jun. 30, 2016Integer	Jun. 30, 2016Interest_Rate_Swaps
Derivatives, Fair Value [Line Items]
Impairment of rental property		$ 2,772			$ 0	$ 2,772	$ 0
Impairment of rental property		2,772				2,772	0
Gain (Loss) on Sale of Properties		0	$ (1,200)		$ 0	(1,155)	$ 0
Number of Interest Rate Derivatives Held								11	11
Debt Issuance Costs, Net		7,100		$ 8,000		7,100
Interest Rate Swap
Derivatives, Fair Value [Line Items]
Notional Amount		$ 300,000				$ 300,000
Minimum number of daily snapshot used for valuation of interest rate swap agreements | snapshot		7,500
NOVA Non-Core Portfolio [Member]
Derivatives, Fair Value [Line Items]
Disposition Date Of Property	[1]					Mar. 25, 2016
Mortgage and Other Indebtedness				200
Impairment of rental property				26,900
One Fair Oaks [Member]
Derivatives, Fair Value [Line Items]
Impairment of rental property				$ 33,900
[1]	Consists of Van Buren Office Park, Herndon Corporate Center, Windsor at Battlefield, Reston Business Campus, Enterprise Center, Gateway Centre Manassas, Linden Business Center and Prosperity Business Center (collectively, the “NOVA Non-Core Portfolio”).

Fair Value Measurements - Fai59

Fair Value Measurements - Fair Value of Debt Instruments (Detail) $ in Thousands		Jun. 30, 2016USD ($)ft²	Dec. 31, 2015USD ($)	Sep. 30, 2015ft²	Jun. 30, 2015ft²	[2]	Mar. 31, 2015ft²	Feb. 24, 2015USD ($)	Apr. 30, 2011ft²
Financial Assets:
Carrying value of notes receivable		$ 0	$ 34,000
Financial Liabilities:
Area of real estate property | ft²	[1]	6,543,762			7,957,016
Carrying Value
Financial Assets:
Carrying value of notes receivable	[3]	$ 0	34,000
Financial Liabilities:
Carrying value of the debt instruments		782,492	732,216
Carrying Value | Mortgages [Member]
Financial Liabilities:
Carrying value of the debt instruments	[4],[5]	335,492	312,216
Carrying Value | Unsecured term loan
Financial Liabilities:
Carrying value of the debt instruments	[4]	300,000	300,000
Carrying Value | Unsecured revolving credit facility
Financial Liabilities:
Carrying value of the debt instruments	[4]	147,000	120,000
Fair Value
Financial Assets:
Fair value of notes receivable	[3]	0	34,000
Financial Liabilities:
Fair value of the debt instruments		771,884	718,541
Fair Value | Mortgages [Member]
Financial Liabilities:
Fair value of the debt instruments	[5]	324,884	298,541
Fair Value | Unsecured term loan
Financial Liabilities:
Fair value of the debt instruments		300,000	300,000
Fair Value | Unsecured revolving credit facility
Financial Liabilities:
Fair value of the debt instruments		$ 147,000	$ 120,000
America Square [Member]
Financial Liabilities:
Area of real estate property | ft²									461,000
Loans Receivable, Gross, Commercial, Real Estate								$ 29,700
Rumsey Center [Domain]
Financial Liabilities:
Area of real estate property | ft²				135,015
Richmond [Member]
Financial Liabilities:
Area of real estate property | ft²	[6]						827,900
[1]	Excludes Storey Park from our Washington, D.C. reporting segment, as the property was in development for the periods presented. Storey Park was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016. On January 1, 2016, we ceased capitalizing expenses associated with the development project as it was being marketed for sale.
[2]	Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6, Investment in Affiliates. Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015, respectively.
[3]	The note receivable was prepaid on June 2, 2016. See note 5, Notes Receivable, for more information regarding the prepayment of the note receivable.
[4]	In the first quarter of 2016, we adopted ASU 2015-03, which requires debt issuance costs to be presented in the balance sheet as a direct deduction from the carrying value of the respective debt liability and which is applied on a retrospective basis. The debt balances exclude a combined total of $7.1 million and $8.0 million of unamortized deferred financing costs at June 30, 2016 and December 31, 2015, respectively.
[5]	Includes $22.0 million and $0.2 million of mortgage debt that was classified within “Liabilities held-for-sale” on our consolidated balance sheets at June 30, 2016 and December 31, 2015, respectively. See note 7, Dispositions, for additional information.
[6]	Consists of Chesterfield Business Center, Hanover Business Center, Park Central, Virginia Technology Center and a three-acre parcel of undeveloped land (collectively, the “Richmond Portfolio”).

Equity - Additional Information

Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions

Aug. 15, 2016

Aug. 08, 2016

Jul. 25, 2016

Jul. 06, 2016

May 16, 2016

May 09, 2016

Apr. 26, 2016

Jan. 19, 2016

Apr. 27, 2016

Sep. 30, 2016

Jun. 30, 2016

Mar. 31, 2016

Jun. 30, 2016

Dec. 31, 2015

Jul. 31, 2015

Dividends Payable [Line Items]

Series A Preferred Shares, shares outstanding

600,000

600,000

6,400,000

Common stock, shares outstanding

58,129,000

58,129,000

57,718,000

Dividend declared date

Apr. 26, 2016

Series A Preferred Shares

Dividends Payable [Line Items]

Series A Preferred Shares, shares outstanding

6,400,000

Stock Redeemed or Called During Period, Shares

3,600,000

2,200,000

5,800,000

Preferred Stock, Redemption Price Per Share

$ 25

$ 25

Preferred Stock, Redemption Date

Jan. 19, 2016

Apr. 27, 2016

Common Shares

Dividends Payable [Line Items]

Stock Repurchase Program, Number of Shares Authorized to be Repurchased

5,000,000

Common share dividend per share declared

$ 0.10

Common share dividend per share annualized

$ 0.40

Dividend paid date

May 16, 2016

Dividend record date

May 9, 2016

Stock Repurchase Program Expiration Date

Jul. 31, 2016

Stock Repurchased and Retired During Period, Shares

924,198

Stock Repurchased and Retired During Period, Weighted Average Share Price

$ 10.99

Stock Repurchased and Retired During Period, Value

$ 10.2

Subsequent Event [Member]

Dividends Payable [Line Items]

Dividend declared date

Jul. 25, 2016

Subsequent Event [Member] | Series A Preferred Shares

Dividends Payable [Line Items]

Series A Preferred Shares, shares outstanding

600,000

Stock Redeemed or Called During Period, Shares

600,000

Preferred Stock, Redemption Date

Jul. 6, 2016

Subsequent Event [Member] | Common Shares

Dividends Payable [Line Items]

Common share dividend per share declared

$ 0.10

Common share dividend per share annualized

$ 0.40

Dividend paid date

Aug. 15, 2016

Dividend record date

Aug. 8, 2016

Equity - Company's Allocation B

Equity - Company's Allocation Between Non-controlling Interests (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Parent	$ (1,602)	$ 590	$ (1,556)	$ 1,195
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling interests in a consolidated partnership	690		690		$ 800
Total equity	462,571	691,096	462,571	691,096	625,328	$ 710,905
Net income (loss)			(1,666)	1,193
Changes in ownership, net			(141,506)	3,219
Distributions to owners			18,953	23,907
Other comprehensive income			(632)	(314)
Increase (Decrease) in Temporary Equity [Roll Forward]
Beginning Balance, Redeemable noncontrolling interests			28,813	33,332
Net income (loss), Redeemable noncontrolling interests			(427)	(225)
Change in ownership, net, Redeemable noncontrolling interests			(1,417)	(1,916)
Distributions to owners, Redeemable noncontrolling interests			651	788
Other comprehensive income, Redeemable noncontrolling interests			(28)	(14)
Ending Balance, Redeemable noncontrolling interests	26,290	30,389	26,290	30,389
First Potomac Realty Trust
Noncontrolling Interest [Line Items]
Net Income (Loss) Attributable to Parent			(1,556)	1,195
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Beginning Balance			624,528	710,007
Changes in ownership, net			(141,506)	3,219
Distributions to owners			18,953	23,811
Other comprehensive income			(632)	(314)
Ending Balance	461,881	690,296	461,881	690,296
Non-redeemable Noncontrolling Interests
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling interests in a consolidated partnership	$ 690	$ 800	690	800	$ 800	$ 898
Net income (loss)			(110)	(2)
Changes in ownership, net			0	0
Distributions to owners			0	96
Other comprehensive income			$ 0	$ 0

Equity - Company's Accumulated

Equity - Company's Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Equity [Abstract]
Beginning balance			$ (2,360)	$ (3,268)
Net unrealized loss on derivative instruments			(660)	(328)
Ending balance	$ (2,992)	$ (3,582)	(2,992)	(3,582)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax, Portion Attributable to Noncontrolling Interest	$ 9	$ 32	$ (28)	$ (14)

Noncontrolling Interests - Addi

Noncontrolling Interests - Additional Information (Detail) ft² in Millions, $ in Millions		3 Months Ended	6 Months Ended
		Jun. 30, 2016USD ($)ft²shares	Jun. 30, 2016USD ($)shares	Dec. 31, 2015USD ($)	Jun. 30, 2015shares	Aug. 04, 2011
Business Acquisition [Line Items]
Cost to acquire all of the outstanding common Operating Partnership units not owned by the Company | $		$ 23.7	$ 23.7
Fair value adjustment, cost basis | $		$ 3.2	$ 3.2	$ 4
Outstanding Operating Partnership units not owned by the Company			2,577,478
Operating Partnership units not owned by Company		0.00%
Common operating partnership units redeemed for cash		41,591	41,591		11,508
Common operating partnership units redeemed for common shares		0	0
Ownership Interest						97.00%
Area Of Land Available For Development In Additional Building Space | ft²		1.3
Storey Park [Member]
Business Acquisition [Line Items]
Ownership Interest		97.00%	97.00%
Disposition Date Of Property	[1]		Jul. 25, 2016
[1]	Storey Park was classified as held-for-sale at June 30, 2016.

Share-Based Payments - Addition

Share-Based Payments - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Shares Purchased for Award	36,828
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized	4,100,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	11,500,000		11,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	5,500,000		5,500,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense associated with trustee share based awards	$ 0.5	$ 0.7	$ 0.9	$ 1.3
Unrecognized compensation cost related to non-vested shares	$ (4.4)		$ (4.4)
Non-Vested Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average period for recognition of non-vested shares	3 years 5 months
Executive Officer [Member] | RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Award, Shares Purchased for Award	36,828

Share-Based Payments - Summary

Share-Based Payments - Summary of Company's Non-vested Share Awards (Detail)	3 Months Ended
	Jun. 30, 2016$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Non-vested Shares, Beginning Balance | shares	531,502
Non-vested Shares, Granted | shares	36,828
Non-vested Shares, Vested | shares	(36,261)
Non-vested Shares, Ending Balance | shares	532,069
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]
Weighted Average Grant Date Fair Value, Beginning Balance | $ / shares	$ 10.45
Weighted Average Grant Date Fair Value, Granted | $ / shares	8.96
Weighted Average Grant Date Fair Value, Vested | $ / shares	10.94
Weighted Average Grant Date Fair Value, Ending Balance | $ / shares	$ 10.31

Segment Information - Additiona

Segment Information - Additional Information (Detail)	3 Months Ended
	Jun. 30, 2016segment
Segment Reporting [Abstract]
Number of Reportable Segments	4

Segment Information - Summary o

Segment Information - Summary of Segment Information (Detail) $ in Thousands		3 Months Ended				6 Months Ended
		Jun. 30, 2016USD ($)ft²Integerbuilding		Jun. 30, 2015USD ($)ft²Integer		Jun. 30, 2016USD ($)ft²Integerbuilding		Jun. 30, 2015USD ($)ft²Integer		Dec. 31, 2015USD ($)
Segment Reporting Information [Line Items]
Number of buildings | Integer	[1]	73		112	[2]	73		112	[2]
Square feet | ft²	[1]	6,543,762		7,957,016	[2]	6,543,762		7,957,016	[2]
Total revenues		$ 38,493		$ 43,039		$ 81,190		$ 86,888
Property operating expense		(8,543)		(10,661)		(20,080)		(23,775)
Real estate taxes and insurance		(4,920)		(4,811)		(10,136)		(9,854)
Total property operating income		25,030		27,567		50,974		53,259
Depreciation and amortization expense		(15,141)		(16,817)		(30,147)		(33,151)
General and administrative		(4,305)		(4,979)		(8,884)		(10,505)
Impairment of Real Estate		(2,772)				(2,772)		0
Other expenses		(4,804)		(5,295)		(11,264)		(8,028)
Loss from discontinued operations		0		0		0		(607)
Net (loss) income		(1,992)		476		(2,093)		968
Total assets		1,320,046	[2]	1,532,197	[2],[3]	1,320,046	[2]	1,532,197	[2],[3]	$ 1,442,406
Capital expenditure	[4]	18,895		12,083		41,539		31,325
Debt Issuance Costs, Line of Credit Arrangements, Net		2,800		5,300		2,800		5,300
Capital expenditures for corporate assets not allocated to any reportable segments		72		0		192		309
Corporate assets not allocated to any reportable segments		$ 18,141		$ 54,043		$ 18,141		$ 54,043
Washington, D.C.
Segment Reporting Information [Line Items]
Number of buildings		6		6	[1],[2]	6		6	[1],[2]
Square feet | ft²		917,241		914,912	[1],[2]	917,241		914,912	[1],[2]
Total revenues		$ 11,580		$ 11,154		$ 22,869		$ 22,186
Property operating expense		(2,563)		(2,987)		(5,532)		(6,126)
Real estate taxes and insurance		(2,422)		(1,956)		(4,794)		(3,979)
Total property operating income		6,595		6,211		12,543		12,081
Total assets		503,484	[2]	503,259		503,484	[2]	503,259
Capital expenditure	[4]	$ 3,287		$ 3,983		$ 8,198		$ 7,419
Maryland
Segment Reporting Information [Line Items]
Number of buildings		34		38	[1],[2]	34		38	[1],[2]
Square feet | ft²		1,885,759		1,997,789	[1],[2]	1,885,759		1,997,789	[1],[2]
Total revenues		$ 10,900		$ 11,034		$ 22,488		$ 22,739
Property operating expense		(2,097)		(2,645)		(5,329)		(6,663)
Real estate taxes and insurance		(960)		(896)		(1,889)		(1,788)
Total property operating income		7,843		7,493		15,270		14,288
Total assets		335,932	[2]	356,736		335,932	[2]	356,736
Capital expenditure	[4]	$ 2,402		$ 2,153		$ 3,361		$ 4,317
Northern Virginia
Segment Reporting Information [Line Items]
Number of buildings		14		49	[1],[2]	14		49	[1],[2]
Square feet | ft²		1,716,904		3,020,388	[1],[2]	1,716,904		3,020,388	[1],[2]
Total revenues		$ 8,707		$ 13,700		$ 21,014		$ 27,815
Property operating expense		(2,194)		(3,191)		(5,514)		(7,257)
Real estate taxes and insurance		(943)		(1,345)		(2,240)		(2,894)
Total property operating income		5,570		9,164		13,260		17,664
Total assets		$ 298,533	[2]	450,324		298,533	[2]	450,324
Capital expenditure	[4]			$ 5,037		$ 28,054		$ 15,880
Southern Virginia
Segment Reporting Information [Line Items]
Number of buildings		19		19	[1],[2]	19		19	[1],[2]
Square feet | ft²		2,023,858		2,023,927	[1],[2]	2,023,858		2,023,927	[1],[2]
Total revenues		$ 7,306		$ 7,151		$ 14,819		$ 14,148
Property operating expense		(1,689)		(1,838)		(3,705)		(3,729)
Real estate taxes and insurance		(595)		(614)		(1,213)		(1,193)
Total property operating income		5,022		4,699		9,901		9,226
Total assets		163,956	[2]	167,835		163,956	[2]	167,835
Capital expenditure	[4]	837		$ 910		$ 1,734		$ 3,400
Northern Virginia
Segment Reporting Information [Line Items]
Capital expenditure	[4]	$ 12,297
[1]	Excludes Storey Park from our Washington, D.C. reporting segment, as the property was in development for the periods presented. Storey Park was classified as held-for-sale at June 30, 2016 and was sold on July 25, 2016. On January 1, 2016, we ceased capitalizing expenses associated with the development project as it was being marketed for sale.
[2]	Total assets include our investment in properties that are owned through joint ventures that are not consolidated within our condensed consolidated financial statements. For more information on our unconsolidated investments, including location within our reportable segments, see note 6, Investment in Affiliates. Corporate assets not allocated to any of our reportable segments totaled $18,141 and $54,043 at June 30, 2016 and 2015, respectively.
[3]	Total assets at June 30, 2015 have been restated to exclude a total of $5.3 million of unamortized deferred financing costs that are now deducted from the respective debt liability in accordance with ASU 2015-03, which we adopted in the first quarter of 2016.
[4]	Capital expenditures for corporate assets not allocated to any of our reportable segments totaled $72 and none for the three months ended June 30, 2016 and 2015, respectively, and $192 and $309 for the six months ended June 30, 2016 and 2015, respectively.