Piedmont Office Realty Trust (PDM) 10-K/A 8 May 17 2016 FY Annual report (amended) Financial data

Document and Entity Information

Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2016	Feb. 20, 2017	Jun. 30, 2016
Document and Entity Information [Abstract]
Entity Registrant Name	Piedmont Office Realty Trust, Inc.
Entity Central Index Key	1,042,776
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K/A
Document Period End Date	Dec. 31, 2016
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	FY
Amendment Flag	true
Amendment Description	Explanatory Note Piedmont is restating its consolidated financial statements as of December 31, 2016 and 2015 and for the two years ended December 31, 2016 included in the Registrant’s Annual Report on Form 10-K for the year ended December 31, 2016. See our Current Report on Form 8-K filed with the SEC on May 3, 2017 for additional details. During the period from December 1, 2010 to September 30, 2016, prior to when the Company early adopted ASC 2017-01, Piedmont disposed of 37 real estate assets. Each of the individual assets constituted the sale of a “business,” as defined by ASC 805, Business Combinations that was effective during that time period. ASC 350, Intangibles - Goodwill and Other requires that when a portion of a reporting unit that constitutes a “business” as defined by ASC 805 is disposed of, goodwill associated with that business shall be included in the carrying amount of the business in determining the gain or loss on disposal. Further, when Piedmont classified real estate assets that constituted a business as held for sale, the carrying amount used to determine an impairment loss, if any, should have included an allocation of goodwill, in accordance with ASC 350. Piedmont did not allocate goodwill associated with its purchase of two property management companies in 2007 to real estate assets disposed of or consider the amount of goodwill attributable to real estate assets held for sale during the period from December 1, 2010 to December 31, 2016 for those that met the definition of a business. On October 1, 2016, the Company adopted the amended definition of a business described in ASU No. 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business on a prospective basis. As a result of the revised definition of a business, individual assets are no longer considered a “business” as defined by GAAP. Accordingly, portions of the goodwill balance will not be allocated to individual assets that do not qualify as a “business” when they are sold. As explained in Note 2 to the consolidated financial statements included within this Form 10-K/A (as defined below), the Company is restating its consolidated financial statements as of December 31, 2016 and 2015 and for the two years ended December 31, 2016 included in Piedmont’s Annual Report on Form 10-K for the year ended December 31, 2016 to correct the errors noted above regarding the application of the accounting treatment under ASC 350 during the time period that it was applicable to the Company’s sales of real estate assets. For each real estate asset that constitutes a business that was disposed of or classified as held for sale during the three years ended December 31, 2016, the restatement and revisions reflects an allocation of goodwill that has been derived based upon the proportionate fair value of the real estate asset to the fair value of Piedmont’s reporting unit (i.e., Piedmont’s equity). Although the adjustments were not material for the year ended December 31, 2014, Piedmont revised its accompanying consolidated financial statements for the year ended December 31, 2014, including the cumulative effect of the 2014 beginning balance of cumulative distributions in excess of earnings to consistently apply the revised accounting, for comparability. The cumulative impact of the non-cash adjustments to correct these errors was a reduction in goodwill and a corresponding increase in cumulative distributions in excess of earnings of approximately $81.2 million as of December 31, 2016. As of December 31, 2015, the cumulative impact of the non-cash adjustments to correct these errors was a reduction in goodwill and cumulative distributions in excess of earnings of approximately $75.3 million and $73.0 million, respectively, and a corresponding increase in other assets held for sale of approximately $2.3 million. The reduction in earnings for the years ended December 31, 2016, 2015, and 2014 was approximately $8.2 million, $41.7 million, and $1.2 million, respectively. Additionally, approximately $30.1 million related to dispositions of real estate prior to 2014 was presented as an adjustment to ending cumulative distributions in excess of earnings as of December 31, 2013. This Amendment No. 1 on Form 10-K/A (“Form 10-K/A”) to our Annual Report on Form 10-K for the year ended December 31, 2016, initially filed with the SEC on February 21, 2017 (the “Original Filing”), is being filed to reflect the restatement of (i) the Company’s consolidated balance sheet at December 31, 2016 and (ii) Piedmont’s consolidated statements of income, comprehensive income, stockholders’ equity and cash flows for the year ended December 31, 2016, and the notes related thereto. Additionally, Piedmont’s consolidated balance sheet as of December 31, 2015 and Piedmont’s consolidated statements of income, comprehensive income, stockholders’ equity and cash flows for the years ended December 31, 2015 and 2014 included in this Form 10-K/A have been restated to reflect the correction of these errors. For the convenience of the reader, this Form 10-K/A sets forth the Original Filing in its entirety and only amends and restates Item 1A of Part I and Items 6, 7, 8 and 9A of Part II of the Original Filing to reflect the adjustments described above and in Note 2, and the related impact on disclosures. No other information in the Original Filing is amended. For a more detailed description of these matters, see Note 2 to the accompanying consolidated financial statements in this Form 10-K/A. Notably, these adjustments did not negatively impact the following metrics: Revenues; Cash position or its total cash flows from operating, investing or financing activities; Liquidity; Funds from operations (“FFO”); Core FFO; Adjusted funds from operations (“AFFO”); Same store NOI; and Any metric utilized in the determination of executive compensation. Additionally, Piedmont remains in compliance with, or has received waivers for, all of its debt agreements and financial covenants. Pursuant to the rules of the SEC, Item 15 of Part IV of the Original Filing has been amended to contain the currently-dated certifications from our Chief Executive Officer and Chief Financial Officer, as required by Sections 302 and 906 of the Sarbanes-Oxley Act of 2002. The certifications of our Chief Executive Officer and Chief Financial Officer are attached to this Form 10-K/A as Exhibits 31.1, 31.2, 32.1 and 32.2, respectively.
Entity Common Stock, Shares Outstanding		145,319,847
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Public Float			$ 3,105,973,293

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Land	$ 669,848				$ 676,091
Buildings and improvements, less accumulated depreciation of $944,573 and $889,857 as of December 31, 2016 and December 31, 2015, respectively	2,927,324				2,837,463
Intangible lease assets, less accumulated amortization of $109,152 and $93,012 as of December 31, 2016 and December 31, 2015, respectively	99,695				84,663
Construction in progress	34,825				20,975
Real estate assets held for sale, net	0				76,614
Total real estate assets	3,731,692				3,695,806
Investment in and amounts due from unconsolidated joint venture	7,360				7,577
Cash and cash equivalents	6,992				5,441				$ 12,306	$ 6,973
Tenant receivables, net of allowance for doubtful accounts of $197 and $83 as of December 31, 2016 and December 31, 2015, respectively	26,494				26,339
Straight-line rent receivables	165,848				147,393
Notes receivable	0				45,400
Restricted cash and escrows	1,212				5,174
Prepaid expenses and other assets	23,655				24,777
Goodwill	98,918	$ 98,918	$ 99,278	$ 104,786	104,786	$ 134,770	$ 139,407	$ 145,340
Deferred lease costs, less accumulated amortization of $178,468 and $146,700 as of December 31, 2016 and December 31, 2015, respectively	305,997				288,041
Other assets held for sale, net	0	0	8,761	11,236	10,777	10,038	9,938	9,703
Total assets	4,368,168	4,307,118	4,217,680	4,281,993	4,361,511	4,689,613	4,735,408	4,780,000
Liabilities:
Unsecured debt, net of discount and unamortized debt issuance costs of $10,269 and $12,779 as of December 31, 2016 and December 31, 2015, respectively	1,687,731				1,528,221
Secured debt, net of premiums and unamortized debt issuance costs of $1,161 and $1,319 as of December 31, 2016 and December 31, 2015, respectively	332,744				501,289
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	165,410				128,465
Deferred income	28,406				27,270
Intangible lease liabilities, less accumulated amortization of $49,225 and $42,315 as of December 31, 2016 and December 31, 2015, respectively	48,005				42,853
Interest rate swaps	8,169				9,993
Total liabilities	2,270,465				2,238,091
Commitments and Contingencies	0				0
Stockholders' Equity:
Shares-in-trust, 150,000,000 shares authorized, none outstanding as of December 31, 2016 or December 31, 2015	0				0
Preferred stock, no par value, 100,000,000 shares authorized, none outstanding as of December 31, 2016 or December 31, 2015	0				0
Common stock, $.01 par value; 750,000,000 shares authorized, 145,235,313 shares issued and outstanding as of December 31, 2016; and 145,511,644 shares issued and outstanding at December 31, 2015	1,452				1,455
Additional paid-in capital	3,673,128				3,669,977
Cumulative distributions in excess of earnings	(1,580,863)	(1,580,553)	(1,536,948)	(1,578,728)	(1,550,698)	(1,613,418)	(1,465,715)	(1,411,258)
Other comprehensive income	2,104				1,661
Piedmont stockholders’ equity	2,095,821	2,085,906	2,124,870	2,085,610	2,122,395	2,048,669	2,216,423	2,252,423
Noncontrolling interest	1,882				1,025
Total stockholders’ equity	2,097,703	2,087,804	2,125,895	2,086,639	2,123,420	2,049,698	2,217,448	2,253,452	$ 2,280,677	$ 2,431,019
Total liabilities and stockholders’ equity	$ 4,368,168	$ 4,307,118	$ 4,217,680	$ 4,281,993	$ 4,361,511	$ 4,689,613	$ 4,735,408	$ 4,780,000

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Assets:
Intangible lease assets, accumulated amortization		$ 109,152	$ 93,012
Tenant receivables, allowance for doubtful accounts		197	83
Deferred lease costs, accumulated amortization		178,468	146,700
Liabilities:
Intangible lease liabilities, accumulated amortization		$ 49,225	$ 42,315
Stockholders' Equity:
Shares-in-trust, shares authorized		150,000,000	150,000,000
Shares-in-trust, shares outstanding		0	0
Preferred stock, par value (in dollars per share)		$ 0	$ 0
Preferred stock, shares authorized		100,000,000	100,000,000
Preferred stock, shares outstanding		0	0
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Common stock, shares authorized		750,000,000	750,000,000
Common stock, shares issued		145,235,313	145,511,644
Common stock, shares outstanding		145,235,313	145,511,644
Unsecured Debt [Member]
Liabilities:
Net of discount, premiums and unamortized debt issuance costs	[1]	$ 10,269	$ 12,779
Secured Debt [Member]
Liabilities:
Net of discount, premiums and unamortized debt issuance costs	[1]	(1,161)	(1,319)
Building and building improvements [Member]
Assets:
Buildings and improvements, accumulated depreciation		$ 944,573	$ 889,857
[1]	Other than the $35 Million Fixed-Rate Loan, all of Piedmont’s outstanding debt as of December 31, 2016 and 2015 is interest-only.

CONSOLIDATED STATEMENTS OF INCO

CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Revenues:
Rental income													$ 459,890		$ 468,872		$ 454,635
Tenant reimbursements													93,961		113,881		109,548
Property management fee revenue													1,864		2,016		2,069
Total revenues	$ 143,911	$ 138,485	$ 135,307	$ 138,012	$ 139,461	$ 148,815	$ 146,734	$ 149,759	$ 146,711	$ 144,641	$ 138,580	$ 136,320	555,715		584,769		566,252
Expenses:
Property operating costs													218,934		242,022		239,431
Depreciation													127,733		134,503		138,596
Amortization													75,119		60,886		56,579
Impairment loss on real estate assets	0	22,951	10,950	0	0	37,105	6,196	0					33,901	[1]	43,301	[1]	0	[1]
General and administrative													29,244		30,346		23,825
Operating Expenses													484,931		511,058		458,431
Real estate operating income	26,633	2,988	14,791	26,372	28,938	(3,424)	19,983	28,214	28,789	27,199	26,556	25,277	70,784		73,711		107,821
Other income (expense):
Interest expense													(64,860)		(73,998)		(74,446)
Other income/(expense)													(13)		1,565		62
Net recoveries/(loss) from casualty events and litigation settlements													34		(278)		6,992
Equity in income/(loss) of unconsolidated joint ventures													362		553		(350)
Nonoperating Income (Expense)													(64,477)		(72,158)		(67,742)
Income from continuing operations	10,529	(13,065)	(1,553)	10,396	11,164	(21,318)	2,531	9,176	12,567	9,150	9,325	9,037	6,307		1,553		40,079
Discontinued operations:
Operating income													0		84		954
Gain/(loss) on sale of real estate assets													0		(1)		262
Income from discontinued operations	0	1	(1)	0	72	14	(3)	0	(42)	16	882	360	0		83		1,216
Gain on sale of real estate assets	19,652	(57)	73,835	(20)	84,427	14,796	21,520	8,940	(8)	0	878	0	93,410		129,683		870
Net income	30,181	(13,121)	72,281	10,376	95,663	(6,508)	24,048	18,116	12,517	9,166	11,085	9,397	99,717		131,319		42,165
Less: Net loss/(income) applicable to noncontrolling interest													15		(15)		(15)
Net income applicable to Piedmont	$ 30,189	$ (13,107)	$ 72,278	$ 10,372	$ 95,660	$ (6,512)	$ 24,044	$ 18,112	$ 12,514	$ 9,162	$ 11,081	$ 9,393	$ 99,732		$ 131,304		$ 42,150
Per share information— basic and diluted:
Income from continuing operations and gain on sale of real estate assets (in dollars per share)													$ 0.69		$ 0.87		$ 0.26
Income from discontinued operations (in dollars per share)													0		0		0.01
Net income available to common stockholders (in dollars per share)	$ 0.21	$ (0.09)	$ 0.50	$ 0.07	$ 0.65	$ (0.05)	$ 0.15	$ 0.12	$ 0.08	$ 0.06	$ 0.07	$ 0.06	$ 0.69		$ 0.87		$ 0.27
Weighted-average shares outstanding - basic (in shares)													145,230,382		150,537,757		154,452,121
Weighted-average shares outstanding - diluted (in shares)													145,634,953		150,880,116		154,585,273
[1]	The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income applicable to Piedmont	$ 99,732	$ 131,304	$ 42,150
Other comprehensive income/(loss):
Effective portion of loss on derivative instruments that are designated and qualify as cash flow hedges (See Note 8)	(4,126)	(12,509)	(17,122)
Reclassification of previously recorded loss included in net income (See Note 8)	4,548	5,875	5,145
Gain/(loss) on investment in available for sale securities	21	(6)	0
Other comprehensive income/(loss)	443	(6,640)	(11,977)
Comprehensive income applicable to Piedmont	$ 100,175	$ 124,664	$ 30,173

CONSOLIDATED STATEMENTS OF STOC

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Cumulative Distributions in Excess of Earnings [Member]	Other Comprehensive Income/ (Loss) [Member]	Non-controlling Interest [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of correction	$ (30,140)			$ (30,140)
Balance, value (As Presented [Member]) at Dec. 31, 2013	2,461,159	$ 1,575	$ 3,668,906	(1,231,209)	$ 20,278	$ 1,609
Balance, value at Dec. 31, 2013	2,431,019	$ 1,575	3,668,906	(1,261,349)	20,278	1,609
Balance (in shares) (As Presented [Member]) at Dec. 31, 2013		157,461,000
Balance (in shares) at Dec. 31, 2013		157,461,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchases as part of an announced plan	(52,796)	$ (32)		(52,764)
Stock repurchases as part of an announced plan (in shares)		(3,190,000)
Retirement of shares returned from escrow	(1,479)	$ (1)	(1,478)
Retirement of shares returned from escrow (in shares)		(85,000)
Redemption of noncontrolling interest in consolidated variable interest entity	(4,054)		(4,054)
Dividends to common stockholders, dividends to preferred stockholders of subsidiary, and dividends reinvested	(125,198)		(188)	(124,995)		(15)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	2,997	$ 1	2,996
Shares issued under the 2007 Omnibus Incentive Plan, net of tax (in shares)		138,000
Net income (loss) applicable to noncontrolling interest | As Presented [Member]	15
Net income (loss) applicable to noncontrolling interest	15					15
Net income applicable to Piedmont (Restated/ Revised) | As Presented [Member]	43,348
Net income applicable to Piedmont (Restated/ Revised)	42,150			42,150
Other comprehensive income/ (loss)	(11,977)				(11,977)
Balance, value at Dec. 31, 2014	$ 2,280,677	$ 1,543	3,666,182	(1,396,958)	8,301	1,609
Balance, (in shares) at Dec. 31, 2014	154,324,089	154,324,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income applicable to Piedmont (Restated/ Revised)	$ 18,112
Balance, value at Mar. 31, 2015	2,253,452
Balance, value at Dec. 31, 2014	$ 2,280,677	$ 1,543	3,666,182	(1,396,958)	8,301	1,609
Balance (in shares) at Dec. 31, 2014	154,324,089	154,324,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchases as part of an announced plan	$ (158,860)	$ (90)		(158,770)
Stock repurchases as part of an announced plan (in shares)		(8,980,000)
Offering costs	(326)		(326)
Redemption of noncontrolling interest in consolidated variable interest entity	54		54
Reallocation of noncontrolling interest of subsidiary	544		1,128			(584)
Dividends to common stockholders, dividends to preferred stockholders of subsidiary, and dividends reinvested	(126,531)		(242)	(126,274)		(15)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	3,183	$ 2	3,181
Shares issued under the 2007 Omnibus Incentive Plan, net of tax (in shares)		168,000
Net income (loss) applicable to noncontrolling interest | As Presented [Member]	15
Net income (loss) applicable to noncontrolling interest	15					15
Net income applicable to Piedmont (Restated/ Revised) | As Presented [Member]	172,990
Net income applicable to Piedmont (Restated/ Revised)	131,304			131,304
Other comprehensive income/ (loss)	(6,640)				(6,640)
Balance, value (As Presented [Member]) at Dec. 31, 2015	2,196,444
Balance, value at Dec. 31, 2015	$ 2,123,420	$ 1,455	3,669,977	(1,550,698)	1,661	1,025
Balance, (in shares) at Dec. 31, 2015	145,511,644	145,512,000
Balance, value at Mar. 31, 2015	$ 2,253,452
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income applicable to Piedmont (Restated/ Revised)	24,044
Balance, value at Jun. 30, 2015	2,217,448
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income applicable to Piedmont (Restated/ Revised)	(6,512)
Balance, value at Sep. 30, 2015	2,049,698
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income applicable to Piedmont (Restated/ Revised)	95,660
Balance, value (As Presented [Member]) at Dec. 31, 2015	2,196,444
Balance, value at Dec. 31, 2015	$ 2,123,420	$ 1,455	3,669,977	(1,550,698)	1,661	1,025
Balance, (in shares) at Dec. 31, 2015	145,511,644	145,512,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income applicable to Piedmont (Restated/ Revised)	$ 10,372
Balance, value at Mar. 31, 2016	2,086,639
Balance, value (As Presented [Member]) at Dec. 31, 2015	2,196,444
Balance, value at Dec. 31, 2015	$ 2,123,420	$ 1,455	3,669,977	(1,550,698)	1,661	1,025
Balance (in shares) at Dec. 31, 2015	145,511,644	145,512,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchases as part of an announced plan	$ (7,943)	$ (5)		(7,938)
Stock repurchases as part of an announced plan (in shares)		(462,000)
Offering costs	(342)		(342)
Noncontrolling interest in consolidated joint venture	888					888
Dividends to common stockholders, dividends to preferred stockholders of subsidiary, and dividends reinvested	(122,148)		(173)	(121,959)		(16)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	$ 3,668	$ 2	3,666
Shares issued under the 2007 Omnibus Incentive Plan, net of tax (in shares)	185,169	185,000
Net income (loss) applicable to noncontrolling interest | As Presented [Member]	$ (15)
Net income (loss) applicable to noncontrolling interest	(15)					(15)
Net income applicable to Piedmont (Restated/ Revised) | As Presented [Member]	107,887
Net income applicable to Piedmont (Restated/ Revised)	99,732			99,732
Other comprehensive income/ (loss)	443				443
Balance, value (As Presented [Member]) at Dec. 31, 2016	2,178,882
Balance, value at Dec. 31, 2016	$ 2,097,703	$ 1,452	3,673,128	(1,580,863)	2,104	1,882
Balance, (in shares) at Dec. 31, 2016	145,235,313	145,235,000
Balance, value at Mar. 31, 2016	$ 2,086,639
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income applicable to Piedmont (Restated/ Revised)	72,278
Balance, value at Jun. 30, 2016	2,125,895
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income applicable to Piedmont (Restated/ Revised)	(13,107)
Balance, value at Sep. 30, 2016	2,087,804
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income applicable to Piedmont (Restated/ Revised)	30,189
Balance, value (As Presented [Member]) at Dec. 31, 2016	2,178,882
Balance, value at Dec. 31, 2016	$ 2,097,703	$ 1,452	$ 3,673,128	$ (1,580,863)	$ 2,104	$ 1,882
Balance, (in shares) at Dec. 31, 2016	145,235,313	145,235,000

CONSOLIDATED STATEMENTS OF STO7

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Statement of Stockholders' Equity [Abstract]
Dividends to common stockholders per share	$ 0.84	$ 0.84	$ 0.81

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Cash Flows from Operating Activities:
Net income		$ 99,717	$ 131,319	$ 42,165
Operating distributions received from unconsolidated joint ventures		579	774	266
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation		127,733	134,503	138,679
Amortization of debt issuance costs		1,702	1,768	1,578
Gain/(loss) on settlement of forward starting interest rate swaps		0	(1,284)	14,960
Other amortization		74,373	61,221	56,327
Impairment loss on real estate assets	[1]	33,901	43,301	0
Stock compensation expense		7,928	8,789	5,250
Equity in loss/(income) of unconsolidated joint ventures		(362)	(553)	350
Gain on sale of real estate assets, net		(93,410)	(129,683)	(1,132)
Retirement of shares returned from escrow		0	0	(1,479)
Changes in assets and liabilities:
Increase in tenant and straight-line rent receivables, net		(26,747)	(29,478)	(40,505)
Decrease/(increase) in restricted cash and escrows		3,229	(5,256)	(135)
Decrease/(increase) in prepaid expenses and other assets		1,996	(828)	(1,884)
Increase/(decrease) in accounts payable and accrued expenses		3,729	(162)	2,995
Increase/(decrease) in deferred income		1,441	4,613	(277)
Net cash provided by operating activities		235,809	219,044	217,158
Cash Flows from Investing Activities:
Acquisition of real estate assets, net of related debt assumed, and intangibles		(349,668)	(382,773)	(117,418)
Net cash held in escrow for acquisitions		0	0	(5,150)
Capitalized expenditures, net of accruals		(110,228)	(118,671)	(168,891)
Redemption of noncontrolling interest in unconsolidated variable interest entity		0	(4,000)	0
Net sale proceeds from wholly-owned properties		365,918	848,169	46,232
Net sale proceeds received from unconsolidated joint ventures		0	0	6,017
Investments in unconsolidated joint ventures		0	0	(42)
Deferred lease costs paid		(25,896)	(37,683)	(27,694)
Net cash provided by/(used in) investing activities		(119,874)	305,042	(266,946)
Cash Flows from Financing Activities:
Debt issuance costs paid		(264)	(1,081)	(1,294)
Proceeds from debt		695,000	1,301,858	1,052,527
Repayments of debt		(706,875)	(1,544,301)	(813,702)
Discount paid due to loan modification		0	0	(1,135)
Costs of issuance of common stock		(342)	(326)	0
Shares withheld to pay tax obligations related to employee stock compensation		(2,344)	(1,710)	(1,275)
Repurchases of common stock as part of announced plan		(7,943)	(158,860)	(54,802)
Dividends paid and discount on dividend reinvestments		(91,616)	(126,531)	(125,198)
Net cash provided by/(used in) financing activities		(114,384)	(530,951)	55,121
Net increase/(decrease) in cash and cash equivalents		1,551	(6,865)	5,333
Cash and cash equivalents, beginning of year		5,441	12,306	6,973
Cash and cash equivalents, end of year		$ 6,992	$ 5,441	$ 12,306
[1]	The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

Organization

Organization	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Piedmont Office Realty Trust, Inc. (“Piedmont”) (NYSE: PDM) is a Maryland corporation that operates in a manner so as to qualify as a real estate investment trust (“REIT”) for federal income tax purposes and engages in the acquisition, development, management, and ownership of commercial real estate properties throughout the United States, including properties that are under construction, are newly constructed, or have operating histories. Piedmont was incorporated in 1997 and commenced operations in 1998. Piedmont conducts business primarily through Piedmont Operating Partnership, L.P. (“Piedmont OP”), a Delaware limited partnership, as well as performing the management of its buildings through two wholly-owned subsidiaries, Piedmont Government Services, LLC and Piedmont Office Management, LLC. Piedmont owns 99.9% of, and is the sole general partner of, Piedmont OP and as such, possesses full legal control and authority over the operations of Piedmont OP. The remaining 0.1% ownership interest of Piedmont OP is held indirectly by Piedmont through its wholly-owned subsidiary, Piedmont Office Holdings, Inc. ("POH"), the sole limited partner of Piedmont OP. Piedmont OP owns properties directly, through wholly-owned subsidiaries, and through both consolidated and unconsolidated joint ventures. References to Piedmont herein shall include Piedmont and all of its subsidiaries, including Piedmont OP and its subsidiaries and joint ventures. As of December 31, 2016 , Piedmont owned 65 in-service office properties, plus one redevelopment asset, two development assets, and one building through an unconsolidated joint venture. Piedmont's total consolidated portfolio consists of 19.6 million rentable square feet (unaudited) of primarily Class A commercial office space. The 65 in-service office properties comprise 18.9 million square feet (unaudited) and were 94.2% leased (unaudited) as of December 31, 2016 . As of December 31, 2016 , approximately 87% of Piedmont's Annualized Lease Revenue (unaudited) was generated from these 65 office properties in select submarkets located primarily within eight major U.S. office markets: Atlanta, Boston, Chicago, Dallas, Minneapolis, New York, Orlando, and Washington, D.C. Piedmont internally evaluates all of the real estate assets as one operating segment, and accordingly, does not report segment information.

Restatement

Restatement	12 Months Ended
	Dec. 31, 2016
Accounting Changes and Error Corrections [Abstract]
Restatement	Restatement The restatement of Piedmont's audited consolidated financial statements results from its subsequent accounting for goodwill resulting from the purchase of two property management companies in order to become a self-managed entity. Previously, Piedmont did not allocate goodwill to the disposal of real estate assets or held for sale real estate assets that met the definition of a business under GAAP, as required by Accounting Standards Codification 350 Intangibles - Goodwill and Other in order to determine gain on disposition of assets or impairments, if any, respectively. For the disposal of real estate assets that constituted a business, goodwill and gain on disposition of assets both should have been reduced by the proportionate amount of goodwill allocated to each disposed real estate asset. The amount of goodwill allocated is derived as the proportionate fair value of the real estate considered to be a business under GAAP at the time of sale to the fair value of Piedmont’s reporting unit. The restated amounts are reflected in the tables below. We have also revised the 2014 financial statements to correct the related immaterial error for that year and prior years. The revised consolidated statement of operations includes a reduction to gain on sale of real estate assets of approximately $1.2 million for the year ended December 31, 2014. Additionally, approximately $30.1 million related to disposals prior to 2014 has been recorded to increase cumulative distributions in excess of earnings as of December 31, 2013 on the accompanying consolidated statements of stockholders' equity. Further, in evaluating the impairment on held for sale real estate assets considered to be a business under GAAP, the proportionate amount of goodwill attributable to the real estate asset held for sale should be considered in determining the amount of impairment, if any. The amount of goodwill attributed is derived as the proportionate fair value of the real estate asset considered to be a business under GAAP held for sale at measurement date to the fair value of Piedmont’s reporting unit. As a result, the restated consolidated balance sheet includes a decrease in goodwill and resulting increase in other real estate assets held for sale of approximately $2.3 million as of December 31, 2015. The consolidated financial statements included in this Form 10-K/A have been restated as of December 31, 2016 and 2015 and for the years then ended to reflect the adjustments described above. The following statements present the effect of the restatement on (i) Piedmont's consolidated balance sheets as of December 31, 2016 and December 31, 2015, (ii) Piedmont's consolidated statements of income for the years ended December 31, 2016 and 2015 and (iii) Piedmont's consolidated statements of cash flows for the years ended December 31, 2016, and 2015. As noted above, Piedmont has also revised the 2014 financial statements to correct the related immaterial error for that year and prior years. Piedmont did not present a summary of the effect of the restatement on the consolidated statement of stockholders' equity for any of the above referenced periods because the impact to stockholders' equity is reflected below in the restated consolidated balance sheets. Piedmont did not present a summary of the effect of the restatement on the consolidated statements of comprehensive income/(loss) for any of the above referenced periods because the impact to net income is reflected below in the restated consolidated statements of income and the restatement adjustments did not affect any other component of comprehensive income. The following table presents the consolidated balance sheet as previously reported, restatement adjustments, and the consolidated balance sheet as restated as of December 31, 2016 (in thousands, except per share data): As Previously Filed Restatement Adjustments As Restated Assets: Real estate assets, at cost: Land $ 669,848 $ — $ 669,848 Buildings and improvements, less accumulated depreciation 2,927,324 — 2,927,324 Intangible lease assets, less accumulated amortization 99,695 — 99,695 Construction in progress 34,825 — 34,825 Real estate assets held for sale, net — — — Total real estate assets 3,731,692 3,731,692 Investment in and amounts due from unconsolidated joint venture 7,360 — 7,360 Cash and cash equivalents 6,992 — 6,992 Tenant receivables, net of allowance for doubtful accounts 26,494 — 26,494 Straight-line rent receivables 165,848 — 165,848 Notes receivable — — — Restricted cash and escrows 1,212 — 1,212 Prepaid expenses and other assets 23,655 — 23,655 Goodwill 180,097 (81,179 ) 98,918 Deferred lease costs, less accumulated amortization 305,997 — 305,997 Other assets held for sale, net — — — Total assets $ 4,449,347 $ (81,179 ) $ 4,368,168 Liabilities: Unsecured debt, net of discount and unamortized debt issuance costs $ 1,687,731 $ — $ 1,687,731 Secured debt, net of premiums and unamortized debt issuance costs 332,744 — 332,744 Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures 165,410 — 165,410 Deferred income 28,406 — 28,406 Intangible lease liabilities, less accumulated amortization 48,005 — 48,005 Interest rate swaps 8,169 — 8,169 Total liabilities 2,270,465 — 2,270,465 Commitments and Contingencies — — — Stockholders’ Equity: Shares-in-trust — — — Preferred stock — — — Common stock 1,452 — 1,452 Additional paid-in capital 3,673,128 — 3,673,128 Cumulative distributions in excess of earnings (1,499,684 ) (81,179 ) (1,580,863 ) Other comprehensive income 2,104 — 2,104 Piedmont stockholders’ equity 2,177,000 (81,179 ) 2,095,821 Noncontrolling interest 1,882 — 1,882 Total stockholders’ equity 2,178,882 (81,179 ) 2,097,703 Total liabilities and stockholders’ equity $ 4,449,347 $ (81,179 ) $ 4,368,168 The following table presents the consolidated balance sheet as previously reported, restatement adjustments, and the consolidated balance sheet as restated as of December 31, 2015 (in thousands, except per share data): As Previously Filed Restatement Adjustments As Restated Assets: Real estate assets, at cost: Land $ 676,091 $ — $ 676,091 Buildings and improvements, less accumulated depreciation 2,837,463 — 2,837,463 Intangible lease assets, less accumulated amortization 84,663 — 84,663 Construction in progress 20,975 — 20,975 Real estate assets held for sale, net 76,614 — 76,614 Total real estate assets 3,695,806 3,695,806 Investment in and amounts due from unconsolidated joint venture 7,577 — 7,577 Cash and cash equivalents 5,441 — 5,441 Tenant receivables, net of allowance for doubtful accounts 26,339 — 26,339 Straight-line rent receivables 147,393 — 147,393 Notes receivable 45,400 — 45,400 Restricted cash and escrows 5,174 — 5,174 Prepaid expenses and other assets 24,777 — 24,777 Goodwill 180,097 (75,311 ) 104,786 Deferred lease costs, less accumulated amortization 288,041 — 288,041 Other assets held for sale, net 8,490 2,287 10,777 Total assets $ 4,434,535 $ (73,024 ) $ 4,361,511 Liabilities: Unsecured debt, net of discount and unamortized debt issuance costs $ 1,528,221 $ — $ 1,528,221 Secured debt, net of premiums and unamortized debt issuance costs 501,289 — 501,289 Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures 128,465 — 128,465 Deferred income 27,270 — 27,270 Intangible lease liabilities, less accumulated amortization 42,853 — 42,853 Interest rate swaps 9,993 — 9,993 Total liabilities 2,238,091 2,238,091 Commitments and Contingencies — — — Stockholders’ Equity: Shares-in-trust — — — Preferred stock — — — Common stock 1,455 — 1,455 Additional paid-in capital 3,669,977 — 3,669,977 Cumulative distributions in excess of earnings (1,477,674 ) (73,024 ) (1,550,698 ) Other comprehensive income 1,661 — 1,661 Piedmont stockholders’ equity 2,195,419 (73,024 ) 2,122,395 Noncontrolling interest 1,025 — 1,025 Total stockholders’ equity 2,196,444 (73,024 ) 2,123,420 Total liabilities and stockholders’ equity $ 4,434,535 $ (73,024 ) $ 4,361,511 The following table presents the consolidated statement of income as previously reported, restatement adjustments, and the consolidated statement of income as restated for the year ended December 31, 2016 (in thousands, except share and per share data): As Previously Filed Restatement Adjustments As Restated Revenues: Rental income $ 459,890 $ — $ 459,890 Tenant reimbursements 93,961 — 93,961 Property management fee revenue 1,864 — 1,864 555,715 — 555,715 Expenses: Property operating costs 218,934 — 218,934 Depreciation 127,733 — 127,733 Amortization 75,119 — 75,119 Impairment loss on real estate assets 30,898 3,003 33,901 General and administrative 29,244 — 29,244 481,928 3,003 484,931 Real estate operating income 73,787 (3,003 ) 70,784 Other income (expense): Interest expense (64,860 ) — (64,860 ) Other income/(expense) (13 ) — (13 ) Net recoveries/(loss) from casualty events and litigation settlements 34 — 34 Equity in income/(loss) of unconsolidated joint ventures 362 — 362 (64,477 ) — (64,477 ) Income from continuing operations 9,310 (3,003 ) 6,307 Discontinued operations: Operating income — — — Gain/(loss) on sale of real estate assets — — — Income from discontinued operations — — — Gain on sale of real estate assets 98,562 (5,152 ) 93,410 Net income 107,872 (8,155 ) 99,717 Less: Net loss/(income) applicable to noncontrolling interest 15 — 15 Net income applicable to Piedmont $ 107,887 $ (8,155 ) $ 99,732 Per share information— basic and diluted: Income from continuing operations and gain on sale of real estate assets $ 0.74 $ (0.05 ) $ 0.69 Income from discontinued operations — — — Net income applicable to common stockholders $ 0.74 $ (0.05 ) $ 0.69 Weighted-average shares outstanding—basic 145,230,382 145,230,382 Weighted-average shares outstanding—diluted 145,634,953 145,634,953 The following table presents the consolidated statement of income as previously reported, restatement adjustments, and the consolidated statement of income as restated for the year ended December 31, 2015 (in thousands, except share and per share data): As Previously Filed Restatement Adjustments As Restated Revenues: Rental income $ 468,872 $ — $ 468,872 Tenant reimbursements 113,881 — 113,881 Property management fee revenue 2,016 — 2,016 584,769 — 584,769 Expenses: Property operating costs 242,022 — 242,022 Depreciation 134,503 — 134,503 Amortization 60,886 — 60,886 Impairment loss on real estate assets 40,169 3,132 43,301 General and administrative 30,346 — 30,346 507,926 3,132 511,058 Real estate operating income 76,843 (3,132 ) 73,711 Other income (expense): Interest expense (73,998 ) — (73,998 ) Other income/(expense) 1,565 — 1,565 Net recoveries/(loss) from casualty events and litigation settlements (278 ) — (278 ) Equity in income/(loss) of unconsolidated joint ventures 553 — 553 (72,158 ) — (72,158 ) Income from continuing operations 4,685 (3,132 ) 1,553 Discontinued operations: Operating income 84 — 84 Gain/(loss) on sale of real estate assets (1 ) — (1 ) Income from discontinued operations 83 — 83 Gain on sale of real estate assets 168,237 (38,554 ) 129,683 Net income 173,005 (41,686 ) 131,319 Less: Net loss/(income) applicable to noncontrolling interest (15 ) — (15 ) Net income applicable to Piedmont $ 172,990 $ (41,686 ) $ 131,304 Per share information— basic and diluted: Income from continuing operations and gain on sale of real estate assets $ 1.15 $ (0.28 ) $ 0.87 Income from discontinued operations — — — Net income applicable to common stockholders $ 1.15 $ (0.28 ) $ 0.87 Weighted-average shares outstanding—basic 150,537,757 150,537,757 Weighted-average shares outstanding—diluted 150,880,116 150,880,116 The following table presents the consolidated statement of income as previously reported, revision adjustments, and the consolidated statement of income as revised for the year ended December 31, 2014 (in thousands, except share and per share data): As Previously Filed Revision Adjustments As Revised Revenues: Rental income $ 454,635 $ — $ 454,635 Tenant reimbursements 109,548 — 109,548 Property management fee revenue 2,069 — 2,069 566,252 — 566,252 Expenses: Property operating costs 239,431 — 239,431 Depreciation 138,596 — 138,596 Amortization 56,579 — 56,579 Impairment loss on real estate assets — — — General and administrative 23,825 — 23,825 458,431 — 458,431 Real estate operating income 107,821 — 107,821 Other income (expense): Interest expense (74,446 ) — (74,446 ) Other income/(expense) 62 — 62 Net recoveries/(loss) from casualty events and litigation settlements 6,992 — 6,992 Equity in income/(loss) of unconsolidated joint ventures (350 ) — (350 ) (67,742 ) — (67,742 ) Income from continuing operations 40,079 — 40,079 Discontinued operations: Operating income 954 — 954 Gain/(loss) on sale of real estate assets 1,198 (936 ) 262 Income from discontinued operations 2,152 (936 ) 1,216 Gain on sale of real estate assets 1,132 (262 ) 870 Net income 43,363 (1,198 ) 42,165 Less: Net loss/(income) applicable to noncontrolling interest (15 ) — (15 ) Net income applicable to Piedmont $ 43,348 $ (1,198 ) $ 42,150 Per share information— basic and diluted: Income from continuing operations and gain on sale of real estate assets $ 0.27 $ (0.01 ) $ 0.26 Income from discontinued operations 0.01 — 0.01 Net income applicable to common stockholders $ 0.28 $ (0.01 ) $ 0.27 Weighted-average shares outstanding—basic 154,452,121 154,452,121 Weighted-average shares outstanding—diluted 154,585,273 154,585,273 The following table presents the consolidated statement of cash flows as previously reported, restatement adjustments, and the consolidated statement of cash flows as restated for the year ended December 31, 2016 (in thousands): As Previously Filed Restatement Adjustments As Restated Cash Flows from Operating Activities: Net income $ 107,872 $ (8,155 ) $ 99,717 Operating distributions received from unconsolidated joint ventures 579 — 579 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 127,733 — 127,733 Amortization of debt issuance costs 1,702 — 1,702 Other amortization 74,373 — 74,373 Impairment loss on real estate assets 30,898 3,003 33,901 Stock compensation expense 7,928 — 7,928 Equity in loss/(income) of unconsolidated joint ventures (362 ) — (362 ) Gain on sale of real estate assets, net (98,562 ) 5,152 (93,410 ) Changes in assets and liabilities: Increase in tenant and straight-line rent receivables, net (26,747 ) — (26,747 ) Decrease/(increase) in restricted cash and escrows 3,229 — 3,229 Decrease/(increase) in prepaid expenses and other assets 1,996 — 1,996 Increase/(decrease) in accounts payable and accrued expenses 3,729 — 3,729 Increase/(decrease) in deferred income 1,441 — 1,441 Net cash provided by operating activities 235,809 — 235,809 Cash Flows from Investing Activities: Acquisition of real estate assets, net of related debt assumed, and intangibles (349,668 ) — (349,668 ) Capitalized expenditures, net of accruals (110,228 ) — (110,228 ) Net sale proceeds from wholly-owned properties 365,918 — 365,918 Deferred lease costs paid (25,896 ) — (25,896 ) Net cash provided by/(used in) investing activities (119,874 ) — (119,874 ) Cash Flows from Financing Activities: Debt issuance costs paid (264 ) — (264 ) Proceeds from debt 695,000 — 695,000 Repayments of debt (706,875 ) — (706,875 ) Costs of issuance of common stock (342 ) — (342 ) Shares withheld to pay tax obligations related to employee stock compensation (2,344 ) — (2,344 ) Repurchases of common stock as part of announced plan (7,943 ) — (7,943 ) Dividends paid and discount on dividend reinvestments (91,616 ) — (91,616 ) Net cash provided by/(used in) financing activities (114,384 ) — (114,384 ) Net increase/(decrease) in cash and cash equivalents 1,551 — 1,551 Cash and cash equivalents, beginning of year 5,441 — 5,441 Cash and cash equivalents, end of year $ 6,992 $ — $ 6,992 The following table presents the consolidated statement of cash flows as previously reported, restatement adjustments, and the consolidated statement of cash flows as restated for the year ended December 31, 2015 (in thousands): As Previously Filed Restatement Adjustments As Restated Cash Flows from Operating Activities: Net income $ 173,005 $ (41,686 ) $ 131,319 Operating distributions received from unconsolidated joint ventures 774 — 774 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 134,503 — 134,503 Amortization of debt issuance costs 1,768 — 1,768 Gain/(loss) on settlement of forward starting interest rate swaps (1,284 ) — (1,284 ) Other amortization 61,221 — 61,221 Impairment loss on real estate assets 40,169 3,132 43,301 Stock compensation expense 8,789 — 8,789 Equity in loss/(income) of unconsolidated joint ventures (553 ) — (553 ) Gain on sale of real estate assets, net (168,237 ) 38,554 (129,683 ) Changes in assets and liabilities: Increase in tenant and straight-line rent receivables, net (29,478 ) — (29,478 ) Decrease/(increase) in restricted cash and escrows (5,256 ) — (5,256 ) Decrease/(increase) in prepaid expenses and other assets (828 ) — (828 ) Increase/(decrease) in accounts payable and accrued expenses (162 ) — (162 ) Increase/(decrease) in deferred income 4,613 — 4,613 Net cash provided by operating activities 219,044 — 219,044 Cash Flows from Investing Activities: Acquisition of real estate assets, net of related debt assumed, and intangibles (382,773 ) — (382,773 ) Capitalized expenditures, net of accruals (118,671 ) — (118,671 ) Redemption of noncontrolling interest in unconsolidated variable interest entity (4,000 ) — (4,000 ) Net sale proceeds from wholly-owned properties 848,169 — 848,169 Deferred lease costs paid (37,683 ) — (37,683 ) Net cash provided by/(used in) investing activities 305,042 — 305,042 Cash Flows from Financing Activities: Debt issuance costs paid (1,081 ) — (1,081 ) Proceeds from debt 1,301,858 — 1,301,858 Repayments of debt (1,544,301 ) — (1,544,301 ) Costs of issuance of common stock (326 ) — (326 ) Shares withheld to pay tax obligations related to employee stock compensation (1,710 ) — (1,710 ) Repurchases of common stock as part of announced plan (158,860 ) — (158,860 ) Dividends paid and discount on dividend reinvestments (126,531 ) — (126,531 ) Net cash provided by/(used in) financing activities (530,951 ) — (530,951 ) Net increase/(decrease) in cash and cash equivalents (6,865 ) — (6,865 ) Cash and cash equivalents, beginning of year 12,306 — 12,306 Cash and cash equivalents, end of year $ 5,441 $ — $ 5,441 The following table presents the consolidated statement of cash flows as previously reported, revision adjustments, and the consolidated statement of cash flows as revised for the year ended December 31, 2014 (in thousands): As Previously Filed Revision Adjustments As Revised Cash Flows from Operating Activities: Net income $ 43,363 $ (1,198 ) $ 42,165 Operating distributions received from unconsolidated joint ventures 266 — 266 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 138,679 — 138,679 Amortization of debt issuance costs 1,578 — 1,578 Gain/(loss) on settlement of forward starting interest rate swaps 14,960 — 14,960 Other amortization 56,327 — 56,327 Stock compensation expense 5,250 — 5,250 Equity in loss/(income) of unconsolidated joint ventures 350 — 350 Gain on sale of real estate assets, net (2,330 ) 1,198 (1,132 ) Retirement of shares returned from escrow (1,479 ) — (1,479 ) Changes in assets and liabilities: Increase in tenant and straight-line rent receivables, net (40,505 ) — (40,505 ) Decrease/(increase) in restricted cash and escrows (135 ) — (135 ) Decrease/(increase) in prepaid expenses and other assets (1,884 ) — (1,884 ) Increase/(decrease) in accounts payable and accrued expenses 2,995 — 2,995 Increase/(decrease) in deferred income (277 ) — (277 ) Net cash provided by operating activities 217,158 — 217,158 Cash Flows from Investing Activities: Acquisition of real estate assets, net of related debt assumed, and intangibles (117,418 ) — (117,418 ) Net cash held in escrow for acquisitions (5,150 ) — (5,150 ) Capitalized expenditures, net of accruals (168,891 ) — (168,891 ) Net sale proceeds from wholly-owned properties 46,232 — 46,232 Net sale proceeds received from unconsolidated joint ventures 6,017 — 6,017 Investments in unconsolidated joint ventures (42 ) — (42 ) Deferred lease costs paid (27,694 ) — (27,694 ) Net cash provided by/(used in) investing activities (266,946 ) — (266,946 ) Cash Flows from Financing Activities: Debt issuance costs paid (1,294 ) — (1,294 ) Proceeds from debt 1,052,527 — 1,052,527 Repayments of debt (813,702 ) — (813,702 ) Discount paid due to loan modification (1,135 ) — (1,135 ) Shares withheld to pay tax obligations related to employee stock compensation (1,275 ) — (1,275 ) Repurchases of common stock as part of announced plan (54,802 ) — (54,802 ) Dividends paid and discount on dividend reinvestments (125,198 ) — (125,198 ) Net cash provided by/(used in) financing activities 55,121 — 55,121 Net increase/(decrease) in cash and cash equivalents 5,333 — 5,333 Cash and cash equivalents, beginning of year 6,973 — 6,973 Cash and cash equivalents, end of year $ 12,306 $ — $ 12,306

Summary of Significant Accounti

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation Piedmont’s consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of Piedmont, Piedmont’s wholly-owned subsidiaries, any variable interest entity ("VIE") of which Piedmont or any of its wholly-owned subsidiaries is considered to have the power to direct the activities of the entity and the obligation to absorb losses/right to receive benefits, or any entity in which Piedmont or any of its wholly-owned subsidiaries owns a controlling interest. In determining whether Piedmont or Piedmont OP has a controlling interest, the following factors, among others, are considered: equity ownership, voting rights, protective rights of investors, and participatory rights of investors. Piedmont owns interests in two real properties through its ownership in 1201 Eye Street, N.W. Associates, LLC and 1225 Eye Street, N.W. Associates, LLC. Piedmont has evaluated these entities based on the criteria outlined above and concluded that these entities are VIEs, but that Piedmont has a controlling interest in both entities through its 100% ownership in Piedmont Washington Properties, Inc. Accordingly, Piedmont’s consolidated financial statements include the accounts of 1201 Eye Street, NW Associates, LLC and 1225 Eye Street, NW Associates, LLC. Additionally, during the year ended December 31, 2016 Piedmont purchased a 99% interest in a joint venture which owns the CNL Center I and CNL Center II buildings in Orlando, Florida. Piedmont evaluated its interest in the joint venture based on the same criteria mentioned above and concluded that it is not a VIE; however, the joint venture is consolidated under the voting model due to Piedmont's 99% ownership interest. As of December 31, 2016 , Piedmont also owned an interest in a property through an unconsolidated joint venture partnership. Although Piedmont is the majority equity participant in this joint venture, Piedmont and its co-venturer exercise joint control over the property. As a result, in accordance with GAAP, the accounts of this joint venture are not consolidated, but rather accounted for using the equity method of accounting in Piedmont’s consolidated financial statements. Please refer to Note 7 for a summary of Piedmont’s interests in and consolidation treatment of its various VIEs as of December 31, 2016 . All inter-company balances and transactions have been eliminated upon consolidation. Further, Piedmont has formed special purpose entities to acquire and hold real estate. Each special purpose entity is a separate legal entity and consequently the assets of the special purpose entities are not available to all creditors of Piedmont. The assets owned by these special purpose entities are being reported on a consolidated basis with Piedmont’s assets for financial reporting purposes only. Use of Estimates The preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying consolidated financial statements and notes. Actual results could differ from those estimates. Real Estate Assets Piedmont classifies its real estate assets as long-lived assets held for use or as long-lived assets held for sale. Held for use assets are stated at cost, as adjusted for any impairment loss, less accumulated depreciation. Held for sale assets are carried at lower of depreciated cost or estimated fair value, less estimated costs to sell. Piedmont generally reclassifies assets as held for sale once a sales contract has been executed and earnest money has become non-refundable. Amounts capitalized to real estate assets consist of the cost of acquisition or construction, any tenant improvements or major improvements, betterments that extend the useful life of the related asset, and transaction costs. All repairs and maintenance are expensed as incurred. Additionally, Piedmont capitalizes interest while the development, or redevelopment, of a real estate asset is in progress. Approximately $4.6 million , $3.8 million , and $2.1 million of interest was capitalized for the years ended December 31, 2016 , 2015 , and 2014 , respectively. Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives: Buildings 40 years Building improvements 5-25 years Land improvements 20-25 years Tenant allowances Lease term Furniture, fixtures, and equipment 3-5 years Intangible lease assets Lease term Piedmont continually monitors events and changes in circumstances that could indicate that the carrying amounts of the real estate and related intangible assets of both operating properties and properties under construction in which Piedmont has an ownership interest, either directly or through investments in joint ventures, may not be recoverable. For wholly owned properties, when indicators of potential impairment are present, or when a sale in the near term is considered more than 50% probable, management assesses whether the respective carrying values will be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition for assets held for use, or from the estimated fair values, less costs to sell, for assets held for sale. In the event that the expected undiscounted future cash flows for assets held for use or the estimated fair value, less costs to sell, for assets held for sale do not exceed the respective asset carrying value, management adjusts such assets to the respective estimated fair values and recognizes an impairment loss. Estimated fair values are calculated based on the following information, depending upon availability, in order of preference: (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of undiscounted cash flows, including estimated sales value (which is based on key assumptions such as estimated market rents, lease-up periods, estimated lease terms, and capitalization and discount rates) less estimated selling costs. For properties owned as part of an investment in an unconsolidated joint venture, Piedmont assesses the estimated fair value of its investment as compared to its carrying amount. If Piedmont determines that the carrying value is greater than the estimated fair value at any measurement date, Piedmont must also determine if such a difference is temporary in nature. Value fluctuations which are “other than temporary” in nature are then recorded to adjust the carrying value to the estimated fair value amount in the period in which such determination is made. Fair Value of Assets and Liabilities of Acquired Properties Upon the acquisition of real properties, Piedmont records the fair value of properties as tangible assets, consisting of land and building, and identified intangible assets and liabilities, consisting of the value of above-market and below-market leases and the value of in-place leases, based on their estimated fair values. The estimated fair values of the tangible assets of an acquired property (which includes land and building) are determined by valuing the property as if it were vacant, and the “as-if-vacant” value is then allocated to land and building based on management’s determination of the estimated fair value of these assets. Management relies on a sales comparison approach using closed land sales and listings in determining the land value, and determines the as-if-vacant estimated fair value of a property using methods similar to those used by independent appraisers. Factors considered by management in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance, and other operating expenses and estimates of lost rental revenue during the expected lease-up periods based on current market demand. Management also estimates the cost to execute similar leases including leasing commissions, legal, and other related costs. The estimated fair values of above-market and below-market in-place leases are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of market rates for the corresponding in-place leases, measured over a period equal to the remaining terms of the leases, taking into consideration the probability of renewals for any below-market leases. The capitalized above-market and below-market lease values are recorded as intangible lease assets or liabilities and amortized as an adjustment to rental revenues over the remaining terms of the respective leases. The estimated fair values of in-place leases include an estimate of the direct costs associated with obtaining the acquired or "in place" tenant, estimates of opportunity costs associated with lost rentals that are avoided by acquiring an in-place lease. The amount capitalized as direct costs associated with obtaining a tenant include commissions, tenant improvements, and other direct costs and are estimated based on management’s consideration of current market costs to execute a similar lease. These direct lease origination costs are included in deferred lease costs in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases. The value of opportunity costs is calculated using the contractual amounts to be paid pursuant to the in-place leases over a market absorption period for a similar lease. These lease intangibles are included in intangible lease assets in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases. Gross intangible assets and liabilities, inclusive of amounts classified as real estate assets held for sale, recorded at acquisition as of December 31, 2016 and 2015 , respectively, are as follows (in thousands): December 31, 2016 December 31, 2015 Intangible Lease Assets: Above-Market In-Place Lease Assets $ 25,425 $ 23,684 In-Place Lease Valuation $ 183,422 $ 153,991 Intangible Lease Origination Costs (included as component of Deferred Lease Costs) $ 261,075 $ 208,497 Intangible Lease Liabilities (Below-Market In-Place Leases) $ 97,230 $ 85,168 For the years ended December 31, 2016 , 2015 , and 2014 , respectively, Piedmont recognized amortization of intangible lease costs as follows (in thousands): 2016 2015 2014 Amortization of Intangible Lease Origination Costs and In-Place Lease Valuation included in amortization expense $ 58,150 $ 42,278 $ 36,007 Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues $ 5,066 $ 4,571 $ 4,727 Net intangible assets and liabilities as of December 31, 2016 will be amortized as follows (in thousands): Intangible Lease Assets Above-Market In-Place Lease Valuation Intangible Lease Origination Costs (1) Below-Market In-place Lease Liabilities For the year ending December 31: 2017 $ 2,590 $ 24,511 $ 33,791 $ 9,138 2018 1,600 17,980 27,156 8,470 2019 910 13,646 22,205 7,270 2020 156 9,614 16,786 5,670 2021 104 8,447 14,731 5,468 Thereafter 227 19,910 36,451 11,989 $ 5,587 $ 94,108 $ 151,120 $ 48,005 Weighted-Average Amortization Period (in years) 3 6 7 7 (1) Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets. Investments in and Amounts Due from Unconsolidated Joint Ventures Piedmont’s investment in its one unconsolidated joint venture is recorded using the equity method of accounting, whereby original investments are recorded at cost and subsequently adjusted for contributions, distributions, net income/(loss), and "other than temporary" impairment losses, if any, attributable to such joint ventures. Pursuant to the terms of the unconsolidated joint venture agreement, all income and distributions are allocated to the joint venture partners in accordance with their respective ownership interests. Distributions from the unconsolidated joint venture are generally distributed to the partners on a quarterly basis and are classified on the accompanying consolidated statements of cash flow using the nature of distribution approach. Distributions of net cash from operations are classified as cash inflows from operating activities, as they are presumed to be returns on Piedmont’s investment in the joint venture. Proceeds received as the result of a sale of an asset from an unconsolidated joint venture are considered a return of Piedmont’s investment in the joint venture and classified as cash inflows from investing activities. Due from unconsolidated joint venture represents operating distributions due to Piedmont from its investment in the unconsolidated joint venture which have been declared but not received as of period end. Cash and Cash Equivalents Piedmont considers all highly-liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents include cash and short-term investments. Short-term investments consist of investments in money market accounts stated at cost, which approximates estimated fair value, and available-for-sale securities resulting from Piedmont's non-qualified deferred compensation program carried at estimated fair value. Tenant Receivables, net and Straight-line Rent Receivables Tenant receivables are comprised of rental and reimbursement billings due from tenants, and straight-line rent receivables representing the cumulative amount of future adjustments necessary to present rental income on a straight-line basis. Tenant receivables are recorded at the original amount earned, less an allowance for any doubtful accounts, which approximates estimated fair value. Management assesses the collectibility of tenant receivables on an ongoing basis and provides for allowances as such balances, or portions thereof, become uncollectible. During the year ended December 31, 2016, Piedmont began classifying provisions for/(recoveries of) bad debts as property operating costs in the accompanying consolidated statements of income to include such expenses as a component of operating the underlying properties. Previously, such costs were presented as general and administrative expenses. Piedmont recognized approximately $216,000 of provisions for bad debts during the year ended December 31, 2016 as a component of property operating costs. In order to conform with the presentation used during the year ended December 31, 2016, Piedmont reclassified approximately $22,000 of provisions for bad debts for the year ended December 31, 2015, and approximately $5,000 of recoveries of bad debts for the year ended December 31, 2014. Restricted Cash and Escrows Restricted cash and escrows principally relate to the following types of items: • escrow accounts held by lenders to pay future real estate taxes, insurance, debt service, and tenant improvements; • net sales proceeds from property sales held by qualified intermediary for potential Section 1031 exchange; • earnest money paid in connection with future acquisitions; and • security and utility deposits paid by tenants per the terms of their respective leases. Restricted cash and escrows are generally reclassified to other asset or liability accounts upon being used to purchase assets, satisfy obligations, or settle tenant obligations. Prepaid Expenses and Other Assets Prepaid expenses and other assets are primarily comprised of the following items: • prepaid property taxes, insurance and operating costs; • deferred common area maintenance costs which will be reimbursed by tenants over specified time periods; • receivables which are unrelated to tenants, for example, insurance proceeds receivable from insurers related to casualty losses; and • equipment, furniture and fixtures, and tenant improvements for Piedmont’s corporate office and property management office space, net of accumulated depreciation. Prepaid expenses and other assets will be expensed as utilized or depreciated in the case of Piedmont's corporate assets. Balances without a future economic benefit are expensed as they are identified. Deferred common area maintenance costs are amortized to property operating costs as the related reimbursement income is recognized over the period specified in the respective lease. Piedmont recognized amortization of deferred common area maintenance for the years ended December 31, 2016 , 2015 , and 2014 of approximately $1.4 million , $2.5 million , and $2.5 million , respectively. Goodwill Goodwill is the excess of cost of an acquired entity over the amounts specifically assigned to assets acquired and liabilities assumed in purchase accounting for business combinations. Piedmont tests the carrying value of its goodwill for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate the carrying amount may be impaired. Such interim circumstances may include, but are not limited to, significant adverse changes in legal factors or in the general business climate, adverse action or assessment by a regulator, unanticipated competition, the loss of key personnel, or persistent declines in an entity’s stock price below carrying value of the entity. Piedmont first assesses qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the estimated fair value of the reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, Piedmont concludes that the estimated fair value is greater than the carrying amount, then performing a further two-step impairment test is unnecessary. However, if Piedmont chooses to forgo the availability of the qualitative analysis, the test prescribed by authoritative accounting guidance is a two-step test. The first step involves comparing the estimated fair value of the entity to its carrying value, including goodwill. Estimated fair value is determined by adjusting the trading price of the stock for a control premium, if necessary, multiplied by the common shares outstanding. If such calculated estimated fair value exceeds the carrying value, no further procedures or analysis is required. However, if the carrying value exceeds the calculated fair value, goodwill is potentially impaired and step two of the analysis would be required. Step two of the test involves calculating the implied fair value of goodwill by deducting the estimated fair value of all tangible and intangible net assets of the entity from the entity’s estimated fair value calculated in step one of the test. If the implied value of the goodwill (the remainder left after deducting the estimated fair values of the entity from its calculated overall estimated fair value in step one of the test) is less than the carrying value of goodwill, an impairment loss would be recognized. Piedmont did not record any impairment on its existing goodwill for the years ended December 31, 2016, 2015, or 2014 related to enterprise valuation in accordance with the calculation methodology above. However, during the period that individual real estate assets qualified as a "business" under GAAP, proportionate amounts of Piedmont's goodwill balance were allocated to the basis of real estate assets sold or classified as held for sale when determining gain or loss on sale or impairment loss on such assets. On October 1, 2016, Piedmont early adopted Accounting Standards Update 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business (as further described in “Accounting Pronouncements Adopted during the Year Ended December 31, 2016” below), and as a result, Piedmont is no longer required to allocate a proportionate amount of goodwill to the basis of real estate assets that do not qualify as a business when those assets are sold or classified as held for sale. The following table presents a reconciliation of the Company’s goodwill from January 1, 2007 to December 31, 2016 (in thousands): Balance as of January 1, 2007 $ — Purchase of property management companies results in Goodwill (April 2007) 180,097 Goodwill allocated to disposition of real estate assets for the years ended December 31, 2007, 2008, 2009 — Balance as of December 31, 2009 180,097 Goodwill allocated to impairment loss on real estate assets (2,557 ) Balance as of December 31, 2010 177,540 Goodwill allocated to disposition of real estate assets (17,533 ) Balance as of December 31, 2011 160,007 Goodwill allocated to disposition of real estate assets (4,303 ) Balance as of December 31, 2012 155,704 Goodwill allocated to disposition of real estate assets (4,412 ) Goodwill allocated to impairment loss on real estate assets (1,335 ) Balance as of December 31, 2013 149,957 Goodwill allocated to disposition of real estate assets (1,198 ) Balance as of December 31, 2014 148,759 Goodwill allocated to disposition of real estate assets (38,554 ) Goodwill allocated to impairment loss on real estate assets (3,132 ) Goodwill allocated to other assets held for sale (2,287 ) Balance as of December 31, 2015 104,786 Goodwill allocated to disposition of real estate assets (5,152 ) Goodwill allocated to impairment loss on real estate assets (716 ) Balance as of December 31, 2016 $ 98,918 Interest Rate Derivatives Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. As of December 31, 2016 and 2015, all of Piedmont's interest rate derivatives were designated as effective cash flow hedges and carried on the balance sheet at estimated fair value. Piedmont reassesses the effectiveness of its derivatives designated as cash flow hedges on a regular basis to determine if they continue to be highly effective and if the forecasted transactions remain highly probable. Piedmont does not use derivatives for trading or speculative purposes. The changes in estimated fair value of interest rate swap agreements designated as effective cash flow hedges are recorded in other comprehensive income (“OCI”), and subsequently reclassified to earnings when the hedged transactions occur. The estimated fair value of the interest rate derivative agreement is recorded as interest rate derivative asset or as interest rate derivative liability in the accompanying consolidated balance sheets. Amounts received or paid under interest rate derivative agreements are recorded as reductions or additions to interest expense in the consolidated income statements as incurred. Additionally, when Piedmont settles forward starting swap agreements, any gain or loss is recorded as accumulated other comprehensive income and is amortized to interest expense over the term of the respective notes on a straight line basis (which approximates the effective interest method). Further, Piedmont classifies cash flows from the settlement of hedging derivative instruments in the same category as the underlying exposure which is being hedged. Settlements resulting from the hedge of Piedmont's exposure to interest rate changes are classified as operating cash flows in the accompanying consolidated statements of cash flows. Deferred Lease Costs Deferred lease costs are comprised of costs and incentives incurred to acquire operating leases. In addition to direct costs, deferred lease costs also include intangible lease origination costs related to in-place leases acquired as part of a property acquisition and direct payroll costs incurred related to negotiating and executing specific leases. For the years ended December 31, 2016 , 2015 , and 2014 , Piedmont capitalized approximately $0.4 million , $1.0 million , and $0.7 million , respectively, of internal leasing and development costs. Deferred lease costs are amortized on a straight-line basis over the terms of the related underlying leases in the accompanying consolidated statements of income as follows: • Approximately $50.1 million , $42.5 million , and $40.9 million of deferred lease costs for the years ended December 31, 2016 , 2015 , and 2014 , respectively, are included in amortization expense; and • Approximately $3.9 million , $4.7 million , and $4.2 million , of deferred lease costs related to lease incentives granted to tenants for the years ended December 31, 2016 , 2015 , and 2014 , respectively, was included as an offset to rental income. Upon receipt of a lease termination notice, Piedmont adjusts the amortization of any unamortized deferred lease costs to be recognized ratably over the revised remaining term of the lease after giving effect to the termination notice. If there is no remaining lease term and no other obligation to provide the tenant space in the property, then any unamortized tenant-specific costs are recognized immediately upon termination. Debt When mortgage debt is assumed upon the acquisition of real property, Piedmont adjusts the loan to estimated fair value with a corresponding adjustment to building and other intangible assets assumed as part of the purchase. The fair value adjustment is amortized to interest expense over the term of the loan using the effective interest method. Amortization of such fair value adjustments was approximately $0.5 million , $0.5 million , and $0.2 million for the years ended December 31, 2016 , 2015 , and 2014 , respectively. Additionally, Piedmont records debt issuance premiums/discounts as an increase/decrease to the principal amount of the loan in the accompanying consolidated balance sheets, and amortizes such premiums or discounts as a component of interest expense over the life of the underlying loan facility using the effective interest method. Piedmont recorded discount amortization of approximately $0.2 million , $0.2 million , and $0.2 million for the years ended December 31, 2016 , 2015 , and 2014 , respectively. Piedmont presents all debt issuance costs as a direct deduction from the principal amount of secured and unsecured debt in the accompanying consolidated balance sheets. Piedmont amortizes these costs to interest expense on a straight-line basis (which approximates the effective interest rate method) over the terms of the related financing arrangements. Piedmont recognized amortization of such costs for the years ended December 31, 2016 , 2015 , and 2014 of approximately $2.9 million , $2.8 million , and $2.7 million , respectively. Deferred income Deferred income is primarily comprised of the following items: • prepaid rent from tenants; and • tenant reimbursements related to operating expense or property tax expenses which may be due to tenants as part of an annual operating expense reconciliation. Deferred income related to prepaid rents from tenants will be recognized as income in the period it is earned. Amounts related to operating expense reconciliations or property tax expense are relieved when the tenant's reconciliation is completed in accordance with the underlying lease, and payment is issued to the tenant. Shares-in-trust To date, Piedmont has not issued any shares-in-trust; however, under Piedmont’s charter, it has authority to issue a total of 150,000,000 shares-in-trust, which would be issued only in the event that there is a purported transfer of, or other change in or affecting the ownership of, Piedmont’s capital stock that would result in a violation of the ownership limits that are included in Piedmont’s charter to protect its REIT status. Preferred Stock To date, Piedmont has not issued any shares of preferred stock; however, Piedmont is authorized to issue up to 100,000,000 shares of one or more classes or series of preferred stock. Piedmont’s board of directors may determine the relative rights, preferences, and privileges of any class or series of preferred stock that may be issued, and can be more beneficial than the rights, preferences, and privileges attributable to Piedmont’s common stock. Common Stock Under Piedmont’s charter, it has authority to issue a total of 750,000,000 shares of common stock with a par value of $0.01 per share. Each share of common stock is entitled to one vote and participates in distributions equally. The board of directors of Piedmont authorized in June 2015 the repurchase and retirement of up to $200 million of Piedmont's common stock through June 2017. Piedmont may repurchase the shares from time to time, in accordance with applicable securities laws, in the open market or in privately negotiated transactions. The timing of repurchases is dependent upon market conditions and other factors, and repurchases may be commenced or suspended from time to time in Piedmont's discretion, without prior notice. As of December 31, 2016 , there was approximately $70.2 million in remaining capacity under the program which may be used for share repurchases through June 2017. Dividends As a REIT, Piedmont is required by the Internal Revenue Code of 1986, as amended (the “Code”), to make distributions to stockholders each taxable year equal to at least 90% of its annual taxable income, computed without regard to the dividends-paid deduction and by excluding net capital gains attributable to stockholders (“REIT taxable income”). Piedmont sponsors a dividend reinvestment plan ("DRP") pursuant to which common stockholders may elect (if their brokerage agreements allow) to reinvest an amount equal to the dividends declared on their common shares into additional shares of Piedmont’s common stock in lieu of receiving cash dividends. Under the DRP, Piedmont has the option to either issue shares purchased in the open market or issue shares directly from Piedmont's authorized but unissued shares, in both cases at a 2% discount for the stockholder. Such election takes place at the settlement of each quarterly dividend in which there are participants in the DRP, and may change from quarter to quarter based on management's judgment of the best use of proceeds for Piedmont. Noncontrolling Interest Noncontrolling interest is the equity interest of consolidated entities that are not owned by Piedmont. Noncontrolling interest is adjusted for contributions, distributions, and earnings (losses) applicable to the noncontrolling interest partners of the consolidated joint ventures. All earnings and distributions are allocated to the partners of the consolidated joint ventures in accordance with their respective partnership agreements. Earnings allocated to such noncontrolling interest partners are recorded as income applicable to noncontrolling interest in the accompanying consolidated statements of income. In addition, certain noncontrolling interests are held in the form of equity participation agreements in Piedmont's consolidated variable interest entities. The equity participation agreements include an option to redeem when certain conditions are met. These instruments are re-measured at the redemption amount once the redemption becomes probable and reclassified to a liability once the redemption option is exercised or conditions are met to make the option mandatorily redeemable. Revenue Recognition All leases of real estate assets held by Piedmont are classified as operating leases, and the related base rental income is recognized on a straight-line basis over the terms of the respective leases. Tenant reimbursements are recognized as revenue in the period that the related operating cost is incurred. Rents and tenant reimbursements collected in advance are recorded as deferred income in the accompanying consolidated balance sheets. Lease termination revenues are recognized ratably as rental revenue over the revised remaining lease term after giving effect to the termination notice. Contingent rental income recognition is deferred until the specific lease-related targets are achieved. Gains on the sale of real estate assets are recognized upon completing the sale and, among other things, determining the sale price and transferring all of the risks and rewards of ownership without significant continuing involvement with the purchaser. Recognition of all or a portion of the gain would be deferred until both of these conditions are met. Losses are primarily recognized through impairment charges when identified. Stock-based Compensation Piedmont has issued stock-based compensation in the form of restricted stock

Acquisitions and Development Pr

Acquisitions and Development Projects	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Acquisitions and Development Projects	Acquisitions and Development Projects During the year ended December 31, 2016 , Piedmont acquired three properties and a 99% interest in a joint venture owning two properties using proceeds from the sales of other properties, proceeds from the $500 Million Unsecured 2015 Line of Credit, and cash on hand, as follows: Property Metropolitan Statistical Area Date of Acquisition Ownership Percentage Acquired Rentable Square Feet (Unaudited) Percentage Leased as of Acquisition (Unaudited) Net Contractual Purchase Price (in millions) CNL Center I and CNL Center II Orlando, Florida August 1, 2016 99 % 622,488 95 % $ 166.7 One Wayside Road Boston, Massachusetts August 10, 2016 100 % 200,605 100 % $ 62.9 Galleria 200 Atlanta, Georgia October 7, 2016 100 % 431,614 89 % $ 69.6 750 West John Carpenter Freeway (1) Dallas, Texas November 30, 2016 100 % 314,714 78 % $ 50.6 (1) Including 3.5 acres of adjacent developable land. In addition to these acquisitions, during the year ended December 31, 2016, Piedmont constructed the 500 TownPark building, a 134,400 square foot, approximately 80% pre-leased four -story office building located in Lake Mary, Florida. Approximately $24.0 million and $1.0 million was recorded in construction in progress related to this project as of December 31, 2016 and 2015, respectively. Also during 2016, Piedmont substantially completed the redevelopment of the 3100 Clarendon Boulevard in Arlington, Virginia, from governmental use into Class A private sector space, and the construction of Enclave Place in Houston, Texas, a 300,900 square foot office building.

Unconsolidated Joint Venture

Unconsolidated Joint Venture	12 Months Ended
	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Unconsolidated Joint Venture	Unconsolidated Joint Venture As of December 31, 2016 and 2015 , Piedmont owned an interest in the following unconsolidated joint venture (in thousands): Joint Venture Property Held by Joint Venture Piedmont’s Ownership Piedmont's Investment in Unconsolidated Joint Venture 2016 2015 Fund XIII and REIT Joint Venture 8560 Upland Drive 72% $ 7,360 $ 7,368

Debt

Debt	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Debt	Debt During the year ended December 31, 2016 , Piedmont repaid the outstanding balance of its $125 Million Fixed-Rate Loan and its $42.5 Million Fixed-Rate Loan, utilizing the first available prepayment opportunity without penalty. Separately, Piedmont incurred during 2016 net additional borrowings on its $500 Million Unsecured 2015 Line of Credit of approximately $157.0 million . As of December 31, 2016 , Piedmont believes it was in compliance with all financial covenants associated with its debt instruments. See Note 9 for a description of Piedmont’s estimated fair value of debt as of December 31, 2016 . The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2016 and 2015 (in thousands): Facility (1) Stated Rate Effective Rate (2) Maturity Amount Outstanding as of 2016 2015 Secured (Fixed) $125 Million Fixed-Rate Loan 5.50 % 5.50 % 4/1/2016 $ — $ 125,000 $42.5 Million Fixed-Rate Loan 5.70 % 5.70 % 10/11/2016 — 42,525 $140 Million WDC Fixed-Rate Loans (3) 5.76 % 5.76 % 11/1/2017 140,000 140,000 $35 Million Fixed-Rate Loan (4) 5.55 % 3.75 % 9/1/2021 31,583 32,445 $160 Million Fixed-Rate Loan (5) 3.48 % 3.58 % 7/5/2022 160,000 160,000 Net premium and unamortized debt issuance costs 1,161 1,319 Subtotal/Weighted Average (6) 4.64 % 332,744 501,289 Unsecured (Variable and Fixed) $170 Million Unsecured 2015 Term Loan (7) LIBOR + 1.125% 1.78 % 5/15/2018 170,000 170,000 $300 Million Unsecured 2013 Term Loan LIBOR + 1.20% 2.78 % 1/31/2019 300,000 300,000 $500 Million Unsecured 2015 Line of Credit (7) LIBOR + 1.00% 1.74 % 6/18/2019 (8) 178,000 21,000 $300 Million Unsecured 2011 Term Loan LIBOR + 1.15% 3.35 % 1/15/2020 300,000 300,000 $350 Million Unsecured Senior Notes 3.40 % 3.43 % 6/01/2023 350,000 350,000 $400 Million Unsecured Senior Notes 4.45 % 4.10 % 3/15/2024 400,000 400,000 Discounts and unamortized debt issuance costs (10,269) (12,779) Subtotal/Weighted Average (6) 3.19 % 1,687,731 1,528,221 Total/Weighted Average (6) 3.43 % $ 2,020,475 $ 2,029,510 (1) Other than the $35 Million Fixed-Rate Loan, all of Piedmont’s outstanding debt as of December 31, 2016 and 2015 is interest-only. (2) Effective rate after consideration of settled or in place interest rate swap agreements and/or issuance premiums or discounts. (3) Collateralized by the 1201 and 1225 Eye Street buildings in Washington, D.C. (4) Collateralized by the 5 Wall Street building in Burlington, Massachusetts. (5) Collateralized by the 1901 Market Street building in Philadelphia, Pennsylvania. (6) Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates in the table as of December 31, 2016 . (7) On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length LIBOR locks. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating. (8) Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided Piedmont is not then in default and upon payment of extension fees. A summary of the aggregate maturities of Piedmont’s indebtedness as of December 31, 2016 , is provided below (in thousands): 2017 $ 140,834 2018 170,960 2019 479,014 (1) 2020 301,072 2021 27,702 Thereafter 910,000 Total $ 2,029,582 (1) Includes the balance outstanding as of December 31, 2016 of the $500 Million Unsecured 2015 Line of Credit. However, Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided Piedmont is not then in default and upon payment of extension fees. Piedmont’s weighted-average interest rate as of December 31, 2016 and 2015 , for the aforementioned borrowings was approximately 3.43% and 3.55% , respectively. Piedmont made interest payments on all indebtedness, including interest rate swap cash settlements of approximately $69.0 million , $76.4 million , and $72.1 million during the years ended December 31, 2016 , 2015 , and 2014 , respectively.

Variable Interest Entities and

Variable Interest Entities and Equity Participation Rights	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities and Equity Participation Rights	Variable Interest Entities and Equity Participation Rights Variable interest holders who have the power to direct the activities of the VIE that most significantly impact the entity’s economic performance and have the obligation to absorb the majority of losses of the entity or the right to receive significant benefits of the entity must consolidate the VIE. Each of the following VIEs has the sole purpose of holding land and office buildings and their resulting operations, and are classified in the accompanying consolidated balance sheets in the same manner as Piedmont’s wholly-owned properties. A summary of Piedmont’s interests in, and consolidation treatment of, its VIEs and their related carrying values as of December 31, 2016 and 2015 is as follows (net carrying amount in millions): Entity Piedmont’s % Ownership of Entity Related Building Consolidated/ Unconsolidated Net Carrying Amount as of December 31, 2016 Net Carrying Amount as of December 31, 2015 Primary Beneficiary Considerations 1201 Eye Street N.W. Associates, LLC 49.5 % 1201 Eye Street Consolidated $ (6.7 ) $ (7.4 ) In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building. 1225 Eye Street N.W. Associates, LLC 49.5 % 1225 Eye Street Consolidated $ 9.9 $ 3.8 In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building. Piedmont 500 W. Monroe Fee, LLC 100 % 500 W. Monroe Consolidated $ 262.4 $ 251.4 The Omnibus Agreement with the previous owner includes equity participation rights for the previous owner, if certain financial returns are achieved; however, Piedmont has sole decision making authority and is entitled to 100% of the economic benefits of the property until such returns are met. Piedmont TownPark Land, LLC previously had an equity participation rights agreement outstanding; however, during the year ended December 31, 2016 , Piedmont exercised its right to terminate the equity participation rights agreement related to Piedmont TownPark Land, LLC, without payment of any consideration.

Derivative Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments Risk Management Objective of Using Derivatives In addition to operational risks which arise in the normal course of business, Piedmont is exposed to economic risks such as interest rate, liquidity, and credit risk. In certain situations, Piedmont has entered into derivative financial instruments such as interest rate swap agreements and other similar agreements to manage interest rate risk exposure arising from current or future variable rate debt transactions. Interest rate swap agreements involve the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. Piedmont’s objective in using interest rate derivatives is to add stability to interest expense and to manage its exposure to interest rate movements. Cash Flow Hedges of Interest Rate Risk Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for Piedmont making fixed-rate payments over the life of the agreements without changing the underlying notional amount. As of December 31, 2016 , Piedmont was party to various interest rate swap agreements, all of which are designated as effective cash flow hedges, which fully hedge the variable cash flows associated with its $300 Million Unsecured 2011 Term Loan and its $300 Million Unsecured 2013 Term Loan. During the year ended December 31, 2016 , Piedmont's forward starting interest rate swap agreements became effective to hedge the extension period of the $300 Million Unsecured 2011 Term Loan through January 2020. Additionally, during the year ended December 31, 2015, Piedmont settled various forward starting swaps with a total notional value of $250 million in conjunction with the issuance of the $160 Million Fixed-Rate Loan (see Note 6 ) for a net loss totaling $1.3 million , of which approximately $0.1 million was expensed immediately upon termination. The remaining loss was recorded as accumulated other comprehensive income and is being amortized as an increase to interest expense over the seven -year term of the $160 Million Fixed-Rate Loan. Also during the year ended December 31, 2015, Piedmont favorably settled four forward starting interest rate swaps with a total notional value of $250 million and recorded the net settlement value of approximately $0.1 million as an offsetting component to interest expense in the accompanying consolidated statements of income, as Piedmont chose not to issue debt within the timing prescribed by the forward starting swap agreements. This gain on settlement of swaps includes a charge for costs incurred to establish the swaps at inception. The maximum length of time over which Piedmont is hedging its exposure to the variability in future cash flows for forecasted transactions is 36 months. A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2016 is as follows: Interest Rate Derivatives: Number of Swap Agreements Associated Debt Instrument Notional Amount (in millions) Effective Date Maturity Date Interest rate swaps 4 $300 Million Unsecured 2013 Term Loan 200 1/30/2014 1/31/2019 Interest rate swaps 2 $300 Million Unsecured 2013 Term Loan 100 8/29/2014 1/31/2019 Interest rate swaps 3 $300 Million Unsecured 2011 Term Loan 300 11/22/2016 1/15/2020 Total $ 600 Piedmont presents its interest rate derivatives on its consolidated balance sheets on a gross basis as interest rate swap assets and interest rate swap liabilities. A detail of Piedmont’s interest rate derivatives on a gross and net basis as of December 31, 2016 and 2015 , respectively, is as follows (in thousands): Interest rate swaps classified as: 2016 2015 Gross derivative assets $ — $ — Gross derivative liabilities 8,169 9,993 Net derivative liability $ 8,169 $ 9,993 The effective portion of Piedmont's interest rate derivatives, including the gain/(loss) on settlement of forward swaps described above, that was recorded in the accompanying consolidated statements of income for the years ended December 31, 2016 , 2015 , and 2014 , respectively, was as follows (in thousands): Interest Rate Swaps in Cash Flow Hedging Relationships 2016 2015 2014 Amount of gain/(loss) recognized in OCI on derivatives $ (4,126 ) $ (12,509 ) $ (17,122 ) Amount of previously recorded loss reclassified from accumulated OCI into interest expense $ 4,548 $ 5,875 $ 5,145 Piedmont estimates that an additional $4.1 million will be reclassified from accumulated other comprehensive loss to interest expense over the next twelve months. Piedmont recognized approximately $0 , $37,000 , and $0 of net loss related to hedge ineffectiveness and terminations of its cash flow hedges during the years ended December 31, 2016 , 2015 , and 2014 , respectively. Additionally, see Note 9 for fair value disclosures of Piedmont's derivative instruments. Credit-risk-related Contingent Features Piedmont has agreements with its derivative counterparties that contain a provision whereby if Piedmont defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then Piedmont could also be declared in default on its derivative obligations. If Piedmont were to breach any of the contractual provisions of the derivative contracts, it would be required to settle its obligations under the agreements at their termination value of the estimated fair values plus accrued interest, or approximately $8.4 million as of December 31, 2016 . Additionally, Piedmont has rights of set-off under certain of its derivative agreements related to potential termination fees and amounts payable under the agreements, if a termination were to occur.

Fair Value Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements Piedmont considers its cash and cash equivalents, tenant receivables, notes receivable, restricted cash and escrows, accounts payable and accrued expenses, interest rate swap agreements, and debt to meet the definition of financial instruments. The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of December 31, 2016 and 2015 , respectively (in thousands): 2016 2015 Financial Instrument Carrying Value Estimated Fair Value Level Within Fair Value Hierarchy Carrying Value Estimated Fair Value Level Within Fair Value Hierarchy Assets: Cash and cash equivalents (1) $ 6,992 $ 6,992 Level 1 $ 5,441 $ 5,441 Level 1 Tenant receivables, net (1) $ 26,494 $ 26,494 Level 1 $ 26,339 $ 26,339 Level 1 Notes receivable (1) $ — $ — Level 1 $ 45,400 $ 45,400 Level 1 Restricted cash and escrows (1) $ 1,212 $ 1,212 Level 1 $ 5,174 $ 5,174 Level 1 Liabilities: Accounts payable and accrued expenses (1) $ 44,733 $ 44,733 Level 1 $ 13,188 $ 13,188 Level 1 Interest rate swap liability $ 8,169 $ 8,169 Level 2 $ 9,993 $ 9,993 Level 2 Debt, net $ 2,020,475 $ 2,027,436 Level 2 $ 2,029,510 $ 2,039,139 Level 2 (1) For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to its short-term maturity. Piedmont's debt was carried at book value as of December 31, 2016 and 2015 ; however, Piedmont's estimate of its estimated fair value is disclosed in the table above. Piedmont uses widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the debt facilities, including the period to maturity of each instrument, and uses observable market-based inputs for similar debt facilities which have transacted recently in the market. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). Scaling adjustments are made to these inputs to make them applicable to the remaining life of Piedmont's outstanding debt. Piedmont has not changed its valuation technique for estimating the fair value of its debt. Piedmont’s interest rate swap agreements presented above, and further discussed in Note 8 , are classified as “Interest rate swap” liabilities in the accompanying consolidated balance sheets and were carried at estimated fair value as of December 31, 2016 and 2015 . The valuation of these derivative instruments was determined using widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the derivatives, including the period to maturity of each instrument, and uses observable market-based inputs, including interest rate curves and implied volatilities. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). In addition, Piedmont considered both its own and the respective counterparties’ risk of nonperformance in determining the estimated fair value of its derivative financial instruments by estimating the current and potential future exposure under the derivative financial instruments that both Piedmont and the counterparties were at risk for as of the valuation date. The credit risk of Piedmont and its counterparties was factored into the calculation of the estimated fair value of the interest rate swaps; however, as of December 31, 2016 and 2015 , this credit valuation adjustment did not comprise a material portion of the estimated fair value. Therefore, Piedmont believes that any unobservable inputs used to determine the estimated fair values of its derivative financial instruments are not significant to the fair value measurements in their entirety, and does not consider any of its derivative financial instruments to be Level 3 liabilities.

Impairment Loss on Real Estate

Impairment Loss on Real Estate Assets	12 Months Ended
	Dec. 31, 2016
Real Estate [Abstract]
Impairment Loss on Real Estate Assets	Impairment Loss on Real Estate Assets Piedmont recorded impairment loss on real estate assets for the years ended December 31, 2016 , 2015 , and 2014 (in thousands): (Restated) (Restated) 2016 2015 2014 Eastpoint I & II (1) $ — $ 6,195 $ — 2 Gatehall Drive (1) — 37,106 — 150 West Jefferson (1) 8,259 — — 9221 Corporate Boulevard (2) 2,692 — — 9200 and 9211 Corporate Boulevard (3) 22,950 — — Total impairment loss on real estate assets (4) $ 33,901 $ 43,301 $ — (1) Piedmont recognized an impairment loss on real estate assets based upon the difference between the carrying value of the asset including a proportionate amount of goodwill and the contracted sales price, less estimated selling costs. (2) Piedmont, using a probability-weighted model heavily weighted towards the short-term sale of the 9221 Corporate Boulevard building in Rockville, Maryland, determined that the carrying value would not be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition. As a result, Piedmont recognized a loss on impairment of approximately $2.7 million during the year ended December 31, 2016 calculated as the difference between the carrying value of the asset including a proportionate amount of goodwill and the anticipated contract sales price, less estimated selling costs. (3) Piedmont elected to sell its remaining two assets and exit the Rockville, Maryland sub-market of Washington, D.C, after selling the 9221 Corporate Boulevard building in July 2016 (mentioned above). Upon management's change in its hold period assumption for the assets from a long-term hold to a near-term sale, Piedmont recognized an impairment loss of approximately $23.0 million . The impairment loss was calculated as the difference between the carrying value of the asset including a proportionate amount of goodwill and the anticipated contracted sales price, less estimated selling costs. (4) The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

Commitments and Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Commitments Under Existing Lease Agreements Under its existing lease agreements, Piedmont may be required to fund significant tenant improvements, leasing commissions, and building improvements. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for capital improvements or other financial obligations. Piedmont classifies its capital improvements into two categories: (i) improvements which maintain the building's existing asset value and its revenue generating capacity (“non-incremental capital expenditures”) and (ii) improvements which incrementally enhance the building's asset value by expanding its revenue generating capacity (“incremental capital expenditures”). As of December 31, 2016 , commitments to fund potential non-incremental capital expenditures over the next five years for tenant improvements totaled approximately $35.3 million related to Piedmont's existing lease portfolio over the respective lease terms, the majority of which Piedmont estimates may be required to be funded over the next three years based on when the underlying leases commence. For most of Piedmont’s leases, the timing of the actual funding of these tenant improvements is largely dependent upon tenant requests for reimbursement. In some cases, these obligations may expire with the leases without further recourse to Piedmont. As of December 31, 2016 , commitments for incremental capital expenditures for tenant improvements associated with executed leases totaled approximately $29.8 million . Contingencies Related to Tenant Audits/Disputes Certain lease agreements include provisions that grant tenants the right to engage independent auditors to audit their annual operating expense reconciliations. Such audits may result in the re-interpretation of language in the lease agreements which could result in the refund of previously recognized tenant reimbursement revenues, resulting in financial loss to Piedmont. Piedmont recorded reductions in reimbursement revenues related to such tenant audits/disputes of approximately $1.1 million , $0.4 million and $0.6 million during the years ended December 31, 2016 , 2015 , and 2014 , respectively. Operating Lease Obligations As of December 31, 2016, the 2001 NW 64 th Street building in Ft. Lauderdale, Florida was subject to a ground lease with an expiration date in 2048 . The aggregate payment required under the terms of this operating lease as of December 31, 2016 are presented below (in thousands): 2017 $ 93 2018 93 2019 93 2020 93 2021 93 Thereafter 2,439 Total $ 2,904 Ground rent expense was approximately $0.1 million , $0.2 million , and $0.5 million for the years ended December 31, 2016 , 2015 , and 2014 , respectively, and is included in property operating costs in the accompanying consolidated statements of income. The net book value of the 2001 NW 64 th Street building located in Ft. Lauderdale, Florida, was approximately $4.7 million and $5.0 million as of December 31, 2016 and 2015 , respectively. Ground rent expense for 2015 and 2014 includes the River Corporate Center building located in Tempe, Arizona, which was sold in April 2015. Litigation Piedmont is from time to time a party to legal proceedings, which arise in the ordinary course of its business. None of these ordinary course legal proceedings are reasonably likely to have a material adverse effect on results of operations or financial condition. Piedmont is not aware of any such legal proceedings contemplated by governmental authorities.

Stock Based Compensation

Stock Based Compensation	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Based Compensation	Stock Based Compensation Deferred Stock Awards From time to time, Piedmont has granted equity awards to all of its employees and independent directors. The deferred stock awards are determined by the Compensation Committee of the board of directors of Piedmont and typically vest on the award anniversary date ratably over a multi-year period. In lieu of providing only deferred stock awards that subsequently vest ratably over a multi-year period, Piedmont utilizes a multi-year performance share program as a portion of the LTIC award eligible for certain of its employees whereby equity awards may be earned only on the relative performance of Piedmont's total stockholder return ("TSR") as compared with a predetermined peer group's total stockholder return over the same multi-year period. Shares, if earned, are not awarded until after the end of the multi-year performance period and vest upon award. Shares granted to independent directors generally vest over a one -year service period. A rollforward of Piedmont's equity based award activity for the year ended December 31, 2016 is as follows: Shares Weighted-Average Grant Date Fair Value Unvested and Potential Stock Awards as of December 31, 2015 959,446 $ 18.67 Deferred Stock Awards Granted 319,083 $ 19.96 Decrease in Estimated Potential Future Performance Share Awards, net of forfeitures (2,358 ) $ 21.22 Performance Stock Awards Vested (53,287 ) $ 18.91 Deferred Stock Awards Vested (258,776 ) $ 18.57 Deferred Stock Awards Forfeited (19,885 ) $ 18.29 Unvested and Potential Stock Awards as of December 31, 2016 944,223 $ 19.44 The following table provides additional information regarding stock award activity during the years ended December 31, 2016 , 2015 , and 2014 (in thousands except for per share data): 2016 2015 2014 Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period (per share) $ 19.96 $ 17.59 $ 17.78 Total Grant Date Fair Value of Deferred Stock Vested During the Period $ 4,806 $ 4,239 $ 3,353 Share-based Liability Awards Paid During the Period (1) $ 1,127 $ — $ — (1) Amounts reflect the issuance of performance share awards related to the 2013-15 Performance Share Plan during the period. A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2016 is as follows: Date of grant Type of Award Net Shares Granted (1) Grant Date Fair Value Vesting Schedule Unvested and Potential Shares as of December 31, 2016 January 3, 2014 Deferred Stock Award 86,512 $ 16.45 Of the shares granted, 20% vested or will vest on January 3, 2015, 2016, 2017, 2018, and 2019, respectively. 52,886 May 9, 2014 Deferred Stock Award 144,625 $ 18.47 Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on May 9, 2015, 2016, and 2017, respectively. 44,047 May 9, 2014 Fiscal Year 2014-2016 Performance Share Program — $ 22.00 Shares awarded, if any, will vest immediately upon determination of award in 2017. 118,448 (2) May 1, 2015 Deferred Stock Award 243,884 $ 17.59 Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on May 1, 2016, 2017, and 2018, respectively. 138,128 May 1, 2015 Fiscal Year 2015-2017 Performance Share Program — $ 18.42 Shares awarded, if any, will vest immediately upon determination of award in 2018. 268,358 (2) May 12, 2016 Deferred Stock Award- Board of Directors 31,368 $ 20.40 Of the shares granted, 100% will vest on May 12, 2017. 31,368 May 24, 2016 Deferred Stock Award 259,957 $ 19.91 Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on May 24, 2017, 2018, and 2019, respectively. 206,380 May 24, 2016 Fiscal Year 2016-2018 Performance Share Program — $ 23.02 Shares awarded, if any, will vest immediately upon determination of award in 2019. 84,608 (2) Total Unvested and Potential Stock Awards 944,223 (1) Amounts reflect the total grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2016 . (2) Estimated based on Piedmont's cumulative TSR for the respective performance period through December 31, 2016 . Share estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid. During the years ended December 31, 2016 , 2015 , and 2014 , Piedmont recognized approximately $8.0 million , $8.9 million and $5.3 million of compensation expense related to stock awards, of which approximately $6.5 million , $7.0 million and $3.8 million , related to the amortization of nonvested shares, respectively. During the year ended December 31, 2016 , a total of 185,169 shares were issued to employees. As of December 31, 2016 , approximately $3.8 million of unrecognized compensation cost related to nonvested, annual deferred stock awards remained, which Piedmont will record in its consolidated statements of income over a weighted-average vesting period of approximately one year.

Earnings Per Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share There are no adjustments to “Net income applicable to Piedmont” or “Income from continuing operations” for the diluted earnings per share computations. Adjustments to the carrying amount of non-controlling interest as a result of the measurement of a redeemable equity participation do not impact net income or comprehensive income; rather such adjustments are treated as the repurchase of a non-controlling interest. Net income per share-basic is calculated as net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net income per share-diluted is calculated as net income available to common stockholders divided by the diluted weighted average number of common shares outstanding during the period, including unvested deferred stock awards. Diluted weighted average number of common shares reflects the potential dilution under the treasury stock method that would occur if the remaining unvested deferred stock awards vested and resulted in additional common shares outstanding. Unvested deferred stock awards which are determined to be anti-dilutive are not included in the calculation of diluted weighted average common shares. The following table reconciles the denominator for the basic and diluted earnings per share computations shown on the consolidated statements of operations for the years ended December 31, 2016 , 2015 , and 2014 , as well as common stock issued and outstanding as of the end of the respective periods (in thousands): 2016 2015 2014 Weighted-average common shares—basic 145,230 150,538 154,452 Plus incremental weighted-average shares from time-vested conversions: Deferred and performance stock awards 405 342 133 Weighted-average common shares—diluted 145,635 150,880 154,585 Common stock issued and outstanding as of period end 145,235 145,512 154,324

Operating Leases

Operating Leases	12 Months Ended
	Dec. 31, 2016
Leases [Abstract]
Operating Leases	Operating Leases Piedmont’s real estate assets are leased to tenants under operating leases for which the terms vary, including certain provisions to extend the lease term, options for early terminations subject to specified penalties, and other terms and conditions as negotiated. Piedmont retains substantially all of the risks and benefits of ownership of the real estate assets leased to tenants. Amounts required as security deposits vary depending upon the terms of the respective leases and the creditworthiness of the tenant; however, generally they are not significant. Exposure to credit risk is limited to the extent that tenant receivables exceed this amount. Security deposits related to tenant leases are included in accounts payable, accrued expenses, dividends payable, and accrued capital expenditures in the accompanying consolidated balance sheets. As of December 31, 2016 , approximately 87% of Piedmont's ALR (unaudited) was generated from select office sub-markets in the following major U.S. cities: Atlanta, Boston, Chicago, Dallas, Minneapolis, New York, Orlando, and Washington, D.C. Furthermore, approximately 8.2% of Piedmont's ALR (unaudited) is generated from federal governmental agencies. The future minimum rental income from Piedmont’s investment in real estate assets under non-cancelable operating leases, excluding unconsolidated joint ventures, as of December 31, 2016 , is presented below (in thousands): Years ending December 31: 2017 $ 434,871 2018 426,532 2019 395,212 2020 359,636 2021 323,940 Thereafter 1,615,265 Total $ 3,555,456

Property Dispositions, Assets H

Property Dispositions, Assets Held for Sale and Discontinued Operations	12 Months Ended
	Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Property Dispositions, Assets Held for Sale, and Discontinued Operations	Property Dispositions, Assets Held for Sale, and Discontinued Operations Property Dispositions Since the adoption of ASU 2014-08 during the year ended December 31, 2014, none of Piedmont's property dispositions have met the criteria to be reported as discontinued operations. The operational results for periods prior to sale for properties sold since the adoption of ASU 2014-08 are presented as continuing operations in the accompanying consolidated statements of income, and the gain/(loss) on sale is presented separately in the consolidated statements of income unless otherwise indicated below. Details of such properties sold are presented below (in thousands), with the calculation of each gain/loss on sale reflecting the allocation of a proportionate amount of goodwill as applicable (see Note 2 for more information): Buildings Sold Location Date of Sale Revised (2014) or Restated Gain/(Loss) on Sale Net Sales Proceeds 2020 West 89th Street Leawood, Kansas May 19, 2014 $ 870 $ 5,515 Two Park Center (1) Hoffman Estates, Illinois May 29, 2014 $ (169 ) $ 6,017 3900 Dallas Parkway Plano, Texas January 30, 2015 $ 8,940 $ 25,803 5601 Headquarters Drive Plano, Texas April 28, 2015 $ 6,390 $ 33,326 River Corporate Center Tempe, Arizona April 29, 2015 $ 4,144 $ 24,223 Copper Ridge Center Lyndhurst, New Jersey May 1, 2015 $ 11,358 $ 50,372 (2) Eastpoint I & II Mayfield Heights, Ohio July 28, 2015 $ (177 ) (4) $ 17,342 3750 Brookside Parkway Alpharetta, Georgia August 10, 2015 $ 761 $ 13,624 Chandler Forum Chandler, Arizona September 1, 2015 $ 13,805 $ 32,267 Aon Center Chicago, Illinois October 29, 2015 $ 84,218 $ 646,243 2 Gatehall Drive Parsippany, New Jersey December 21, 2015 $ 162 (4) $ 50,369 1055 East Colorado Boulevard Pasadena, California April 21, 2016 $ 29,462 $ 60,076 Fairway Center II Brea, California April 28, 2016 $ 14,406 $ 33,062 1901 Main Street Irvine, California May 2, 2016 $ 29,964 $ 63,149 (3) 9221 Corporate Boulevard Rockville, Maryland July 27, 2016 $ (192 ) (4) $ 12,035 150 West Jefferson Detroit, Michigan July 29, 2016 $ (664 ) (4) $ 77,844 9200 and 9211 Corporate Boulevard Rockville, Maryland September 28, 2016 $ (41 ) (4) $ 12,519 11695 Johns Creek Parkway Johns Creek, Georgia December 22, 2016 $ 1,978 $ 13,827 Braker Pointe III Austin, Texas December 29, 2016 $ 18,579 $ 48,006 (1) Property was owned as part of the unconsolidated joint venture, Fund XIII and REIT Joint Venture. As such, the loss on sale was presented as equity in income/(loss) of unconsolidated joint ventures. (2) As part of the transaction, Piedmont accepted a secured promissory note from the buyer for the remaining $45.4 million owed on the sale. During the year ended December 31, 2016, the note receivable was repaid in full and such proceeds are reflected in the accompanying consolidated statements of cash flows as net sales proceeds from the sale of wholly-owned properties. (3) As part of the transaction, Piedmont accepted a secured promissory note from the buyer for $33.0 million , and the note receivable was repaid in full during the year ended December 31, 2016. As such, the full proceeds from the sale of the property are reflected in the accompanying consolidated statements of cash flows as net sales proceeds from the sale of wholly-owned properties. (4) As discussed in Note 10 above, Piedmont recognized an impairment loss prior to, or in conjunction with, the sale of the property. Therefore, any gain/(loss) recognized upon the consummation of the sale consists solely of adjustments made subsequent to the sale for closing cost estimates or post-closing prorations. Assets Held for Sale As of December 31, 2016, no assets met the criteria for held for sale classification. For comparative purposes, any property which met the criteria to be presented as held for sale as of March 31, 2016, June 30, 2016, or September 30, 2016 was re-classified as held for sale as of December 31, 2015. The only property meeting this criteria was the 150 West Jefferson building (sold on July 29, 2016). Details of amounts held for sale as of December 31, 2015 are presented below (in thousands): (Restated) December 31, 2016 December 31, 2015 Real estate assets held for sale, net: Land $ — $ 9,759 Building and improvements, less accumulated depreciation of $0 and $32,162 as of December 31, 2016, and 2015, respectively — 66,840 Construction in progress — 15 Total real estate assets held for sale, net $ — $ 76,614 Other assets held for sale, net: Straight-line rent receivables $ — $ 4,729 Prepaid expenses and other assets — 66 Allocation of goodwill (see Note 2) — 2,287 Deferred lease costs, less accumulated amortization of $0 and $1,162 as of December 31, 2016 and 2015, respectively — 3,695 Total other assets held for sale, net $ — $ 10,777 Discontinued Operations Asset disposals previously classified as, and that continue to be reported as, discontinued operations for the year ended December 31, 2014 are as follows (in thousands): (Revised) Building Sold Location Date of Sale Gain/(Loss) on Sale Net Sales Proceeds 11107 and 11109 Sunset Hills Road Reston, Virginia March 19, 2014 $ (102 ) $ 22,326 1441 West Long Lake Road Troy, Michigan April 30, 2014 $ 182 $ 7,202 4685 Investment Drive Troy, Michigan April 30, 2014 $ 191 $ 11,198 Details comprising income from discontinued operations are presented below (in thousands): Years Ended December 31, 2016 2015 2014 (Revised) Revenues: Rental income $ — $ 19 $ 1,365 Tenant reimbursements — 64 125 Property management fee revenue — — 1 — 83 1,491 Expenses: Property operating costs — (1 ) 225 Depreciation — — 83 Amortization — — 223 — (1 ) 531 Other income (expense): Other income/(expense) — — (6 ) — — (6 ) Operating income, excluding gain/(loss) on sale of real estate assets — 84 954 Gain/(loss) on sale of real estate assets — (1 ) 262 Income from discontinued operations $ — $ 83 $ 1,216

Supplemental Disclosures of Non

Supplemental Disclosures of Noncash Activities	12 Months Ended
	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Supplemental Disclosures of Noncash Activities	Supplemental Disclosures of Noncash Activities Certain noncash investing and financing activities for the years ended December 31, 2016 , 2015 , and 2014 (in thousands) are outlined below: 2016 2015 2014 Accrued capital expenditures and deferred lease costs $ 14,427 $ 20,630 $ 19,896 Accrued dividends and discount on dividend reinvestments $ 30,532 $ — $ — Escrowed cash from prior year applied to acquisitions in the current year $ — $ (5,050 ) $ — Change in accrued share repurchases as part of an announced plan $ — $ — $ (2,006 )

Income Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Piedmont’s income tax basis net income for the years ended December 31, 2016 , 2015 , and 2014 , is calculated as follows (in thousands): (Restated) (Restated) (Revised) 2016 2015 2014 GAAP basis financial statement net income $ 99,732 $ 131,304 $ 42,150 Increase (decrease) in net income resulting from: Depreciation and amortization expense recognized for financial reporting purposes in excess of amounts recognized for income tax purposes 69,214 (1,717 ) 50,810 Rental income accrued for income tax purposes less than amounts for financial reporting purposes (18,964 ) (12,123 ) (28,504 ) Net amortization of above/below-market lease intangibles for income tax purposes in excess of amounts for financial reporting purposes (4,895 ) (4,614 ) (4,705 ) Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes (118,713 ) (43,493 ) (28,360 ) Taxable income/(loss) of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes (1,042 ) 2,491 (468 ) Other expenses, including impairment loss on real estate assets, for financial reporting purposes in excess of amounts for income tax purposes 42,019 54,425 5,727 Taxable income for Piedmont Office Holdings, Inc. in excess of amount for financial reporting purposes 648 — — Income tax basis net income, prior to dividends paid deduction $ 67,999 $ 126,273 $ 36,650 For income tax purposes, dividends to common stockholders are characterized as ordinary income, capital gains, or as a return of a stockholder’s invested capital. The composition of Piedmont’s distributions per common share is presented below: 2016 2015 2014 Ordinary income 81.77 % 31.75 % 29.32 % Return of capital 18.23 % — % 70.68 % Capital gains — % 68.25 % — % 100 % 100 % 100 % As of December 31, 2016 and 2015 , the tax basis carrying value of Piedmont’s total assets was approximately $4.3 billion and $4.2 billion , respectively. Accrued interest and penalties related to uncertain tax positions are included in accounts payable, accrued expenses, dividends payable, and accrued capital expenditures in the accompanying consolidated balance sheets and the tax liability recorded, including the interest and penalties, was approximately $3.8 million as of December 31, 2016 and 2015 . Piedmont recorded no additional expense during the years ended December 31, 2016 , 2015 , and 2014 , respectively, related to such positions. The tax years 2013 to 2016 remain open to examination by various federal and state taxing authorities.

Quarterly Results (unaudited)

Quarterly Results (unaudited)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Quarterly Results (unaudited)	Quarterly Results (unaudited) A summary of the unaudited quarterly financial information for the years ended December 31, 2016 (restated), 2015 (restated), and 2014 (revised) is presented below (in thousands, except per-share data): 2016 Statement of Income Data: First Second Third Fourth Revenues $ 138,012 $ 135,307 $ 138,485 $ 143,911 Impairment loss on real estate assets $ — $ 10,950 $ 22,951 $ — Real estate operating income $ 26,372 $ 14,791 $ 2,988 $ 26,633 Income/(loss) from continuing operations $ 10,396 $ (1,553 ) $ (13,065 ) $ 10,529 Income/(loss) from discontinued operations $ — $ (1 ) $ 1 $ — Gain/(loss) on sale of real estate assets $ (20 ) $ 73,835 $ (57 ) $ 19,652 Net Income $ 10,376 $ 72,281 $ (13,121 ) $ 30,181 Net income/(loss) applicable to Piedmont $ 10,372 $ 72,278 $ (13,107 ) $ 30,189 Per-Share Data: Basic and diluted earnings/(loss) per share $ 0.07 $ 0.50 $ (0.09 ) $ 0.21 Dividends declared per share $ 0.21 $ 0.21 $ 0.21 $ 0.21 Balance Sheet Data: Goodwill $ 104,786 $ 99,278 $ 98,918 $ 98,918 Other assets held for sale, net $ 11,236 $ 8,761 $ — $ — Total assets $ 4,281,993 $ 4,217,680 $ 4,307,118 $ 4,368,168 Total debt, net (unsecured and secured debt) $ 2,002,918 $ 1,884,314 $ 1,994,078 $ 2,020,475 Cumulative distributions in excess of earnings $ (1,578,728 ) $ (1,536,948 ) $ (1,580,553 ) $ (1,580,863 ) Piedmont stockholders' equity $ 2,085,610 $ 2,124,870 $ 2,085,906 $ 2,095,821 Total stockholders' equity $ 2,086,639 $ 2,125,895 $ 2,087,804 $ 2,097,703 Total liabilities and stockholders' equity $ 4,281,993 $ 4,217,680 $ 4,307,118 $ 4,368,168 2015 Statement of Income Data: First Second Third Fourth Revenues $ 149,759 $ 146,734 $ 148,815 $ 139,461 Impairment loss on real estate assets $ — $ 6,196 $ 37,105 $ — Real estate operating income $ 28,214 $ 19,983 $ (3,424 ) $ 28,938 Income/(loss) from continuing operations $ 9,176 $ 2,531 $ (21,318 ) $ 11,164 Income/(loss) from discontinued operations $ — $ (3 ) $ 14 $ 72 Gain on sale of real estate assets $ 8,940 $ 21,520 $ 14,796 $ 84,427 Net income/(loss) $ 18,116 $ 24,048 $ (6,508 ) $ 95,663 Net income/(loss) applicable to Piedmont $ 18,112 $ 24,044 $ (6,512 ) $ 95,660 Per-Share Data: Basic and diluted earnings/(loss) per share $ 0.12 $ 0.15 $ (0.05 ) $ 0.65 Dividends declared per share $ 0.21 $ 0.21 $ 0.21 $ 0.21 Balance Sheet Data: Goodwill $ 145,340 $ 139,407 $ 134,770 $ 104,786 Other assets held for sale, net $ 9,703 $ 9,938 $ 10,038 $ 10,777 Total assets $ 4,780,000 $ 4,735,408 $ 4,689,613 $ 4,361,511 Total debt, net (unsecured and secured debt) $ 2,318,717 $ 2,312,804 $ 2,421,099 $ 2,029,510 Cumulative distributions in excess of earnings $ (1,411,258 ) $ (1,465,715 ) $ (1,613,418 ) $ (1,550,698 ) Piedmont stockholders' equity $ 2,252,423 $ 2,216,423 $ 2,048,669 $ 2,122,395 Total stockholders' equity $ 2,253,452 $ 2,217,448 $ 2,049,698 $ 2,123,420 Total liabilities and stockholders' equity $ 4,780,000 $ 4,735,408 $ 4,689,613 $ 4,361,511 2014 Statement of Income Data: First Second Third Fourth Revenues $ 136,320 $ 138,580 $ 144,641 $ 146,711 Real estate operating income $ 25,277 $ 26,556 $ 27,199 $ 28,789 Income from continuing operations $ 9,037 $ 9,325 $ 9,150 $ 12,567 Income/(loss) from discontinued operations $ 360 $ 882 $ 16 $ (42 ) Gain/(loss) on sale of real estate assets $ — $ 878 $ — $ (8 ) Net Income $ 9,397 $ 11,085 $ 9,166 $ 12,517 Net income applicable to Piedmont $ 9,393 $ 11,081 $ 9,162 $ 12,514 Per-Share Data: Basic and diluted earnings per share $ 0.06 $ 0.07 $ 0.06 $ 0.08 Dividends declared per share $ 0.20 $ 0.20 $ 0.20 $ 0.21

Guarantor and Non-Guarantor Fin

Guarantor and Non-Guarantor Financial Information	12 Months Ended
	Dec. 31, 2016
Guarantor and Non-Guarantor Financial Information [Abstract]
Guarantor and Non-Guarantor Financial Information	Guarantor and Non-Guarantor Financial Information The following condensed consolidating financial information for Piedmont Operating Partnership, L.P. (the "Issuer"), Piedmont Office Realty Trust, Inc. (the "Guarantor"), and the other directly and indirectly owned subsidiaries of the Guarantor (the "Non-Guarantor Subsidiaries") is provided pursuant to the requirements of Rule 3-10 of Regulation S-X regarding financial statements of guarantors and issuers of guaranteed registered securities. The Issuer is a wholly-owned subsidiary of the Guarantor, and all guarantees by the Guarantor of securities issued by the Issuer are full and unconditional. The principal elimination entries relate to investments in subsidiaries and intercompany balances and transactions, including transactions with the Non-Guarantor Subsidiaries. Condensed Consolidated Balance Sheets (As Restated, See Note 2) As of December 31, 2016 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Real estate assets, at cost: Land $ 46,133 $ — $ 623,715 $ — $ 669,848 Buildings and improvements, less accumulated depreciation 228,194 — 2,699,430 (300 ) 2,927,324 Intangible lease assets, less accumulated amortization 725 — 98,970 — 99,695 Construction in progress 145 — 34,680 — 34,825 Total real estate assets 275,197 — 3,456,795 (300 ) 3,731,692 Investments in and amounts due from unconsolidated joint ventures 7,360 — — — 7,360 Cash and cash equivalents 3,674 150 3,168 — 6,992 Tenant and straight-line receivables, net 20,159 — 172,183 — 192,342 Advances to affiliates 6,464,135 1,315,616 — (7,779,751 ) — Investment in subsidiary — 3,630,564 181 (3,630,745 ) — Notes receivable 88,910 — 95,790 (184,700 ) — Prepaid expenses, restricted cash, escrows, and other assets 6,189 — 20,575 (1,897 ) 24,867 Goodwill 98,918 — — — 98,918 Deferred lease costs, net 16,550 — 289,447 — 305,997 Total assets $ 6,981,092 $ 4,946,330 $ 4,038,139 $ (11,597,393 ) $ 4,368,168 Liabilities: Debt, net $ 1,701,933 $ — $ 503,242 $ (184,700 ) $ 2,020,475 Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures 17,365 31,230 118,712 (1,897 ) 165,410 Advances from affiliates 708,340 5,071,521 2,098,146 (7,878,007 ) — Deferred income 5,206 — 23,200 — 28,406 Intangible lease liabilities, net — — 48,005 — 48,005 Interest rate swaps 8,169 — — — 8,169 Total liabilities 2,441,013 5,102,751 2,791,305 (8,064,604 ) 2,270,465 Stockholders’ Equity: Common stock — 1,452 — — 1,452 Additional paid-in capital 3,626,564 3,676,000 1,309 (3,630,745 ) 3,673,128 Retained/(cumulative distributions in excess of) earnings 911,411 (3,833,873 ) 1,243,643 97,956 (1,580,863 ) Other comprehensive loss 2,104 — — — 2,104 Piedmont stockholders’ equity 4,540,079 (156,421 ) 1,244,952 (3,532,789 ) 2,095,821 Noncontrolling interest — — 1,882 — 1,882 Total stockholders’ equity 4,540,079 (156,421 ) 1,246,834 (3,532,789 ) 2,097,703 Total liabilities and stockholders’ equity $ 6,981,092 $ 4,946,330 $ 4,038,139 $ (11,597,393 ) $ 4,368,168 Condensed Consolidated Balance Sheets (As Restated, See Note 2) As of December 31, 2015 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Real estate assets, at cost: Land $ 54,459 $ — $ 621,632 $ — $ 676,091 Buildings and improvements, less accumulated depreciation 270,057 — 2,567,706 (300 ) 2,837,463 Intangible lease assets, less accumulated amortization 1,268 — 83,395 — 84,663 Construction in progress 240 — 20,735 — 20,975 Real estate assets held for sale, net 76,614 — — — 76,614 Total real estate assets 402,638 — 3,293,468 (300 ) 3,695,806 Investments in and amounts due from unconsolidated joint ventures 7,577 — — — 7,577 Cash and cash equivalents 2,174 150 3,117 — 5,441 Tenant and straight-line rent receivables, net 23,738 — 149,994 — 173,732 Advances to affiliates 6,127,343 1,251,530 — (7,378,873 ) — Investment in subsidiary — 3,752,523 186 (3,752,709 ) — Notes receivable 134,750 — 23,890 (113,240 ) 45,400 Prepaid expenses, restricted cash, escrows, and other assets 7,091 — 24,118 (1,258 ) 29,951 Goodwill 104,786 — — — 104,786 Deferred lease costs, net 20,939 — 267,102 — 288,041 Other assets held for sale, net 10,777 — — — 10,777 Total assets $ 6,841,813 $ 5,004,203 $ 3,761,875 $ (11,246,380 ) $ 4,361,511 Liabilities: Debt, net $ 1,552,007 $ — $ 590,743 $ (113,240 ) $ 2,029,510 Accounts payable, accrued expenses, and accrued capital expenditures 18,954 580 110,189 (1,258 ) 128,465 Advances from affiliates 580,526 5,033,266 1,842,577 (7,456,369 ) — Deferred income 5,905 — 21,365 — 27,270 Intangible lease liabilities, net — — 42,853 — 42,853 Interest rate swaps 9,993 — — — 9,993 Total liabilities 2,167,385 5,033,846 2,607,727 (7,570,867 ) 2,238,091 Stockholders’ Equity: Common stock — 1,455 — — 1,455 Additional paid-in capital 3,748,524 3,672,849 1,314 (3,752,710 ) 3,669,977 Retained/(cumulative distributions in excess of) earnings 924,243 (3,703,947 ) 1,151,809 77,197 (1,550,698 ) Other comprehensive loss 1,661 — — — 1,661 Piedmont stockholders’ equity 4,674,428 (29,643 ) 1,153,123 (3,675,513 ) 2,122,395 Noncontrolling interest — — 1,025 — 1,025 Total stockholders’ equity 4,674,428 (29,643 ) 1,154,148 (3,675,513 ) 2,123,420 Total liabilities and stockholders’ equity $ 6,841,813 $ 5,004,203 $ 3,761,875 $ (11,246,380 ) $ 4,361,511 Condensed Consolidated Statements of Income (As Restated, See Note 2) For the year ended December 31, 2016 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Revenues: Rental income $ 55,007 $ — $ 407,514 $ (2,631 ) $ 459,890 Tenant reimbursements 14,081 — 80,378 (498 ) 93,961 Property management fee revenue — — 16,897 (15,033 ) 1,864 69,088 — 504,789 (18,162 ) 555,715 Expenses: Property operating costs 31,967 — 205,344 (18,377 ) 218,934 Depreciation 16,657 — 111,076 — 127,733 Amortization 3,715 — 71,404 — 75,119 Impairment loss on real estate assets 8,259 — 25,642 — 33,901 General and administrative 28,314 311 36,065 (35,446 ) 29,244 88,912 311 449,531 (53,823 ) 484,931 Real estate operating income/(loss) (19,824 ) (311 ) 55,258 35,661 70,784 Other income (expense): Interest expense (49,108 ) — (27,636 ) 11,884 (64,860 ) Other income/(expense) 9,560 282 2,029 (11,884 ) (13 ) Net recoveries from casualty events and litigation settlements — — 34 — 34 Equity in income of unconsolidated joint ventures 362 — — — 362 (39,186 ) 282 (25,573 ) — (64,477 ) Income/(loss) from continuing operations (59,010 ) (29 ) 29,685 35,661 6,307 Gain on sale of real estate assets 31,275 — 62,135 — 93,410 Net income/(loss) (27,735 ) (29 ) 91,820 35,661 99,717 Less: Net loss applicable to noncontrolling interest — — 15 — 15 Net income/(loss) applicable to Piedmont $ (27,735 ) $ (29 ) $ 91,835 $ 35,661 $ 99,732 Condensed Consolidated Statements of Income (As Restated, See Note 2) For the year ended December 31, 2015 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Revenues: Rental income $ 67,317 $ — $ 404,460 $ (2,905 ) $ 468,872 Tenant reimbursements 13,340 — 100,955 (414 ) 113,881 Property management fee revenue — — 17,801 (15,785 ) 2,016 80,657 — 523,216 (19,104 ) 584,769 Expenses: Property operating costs 36,380 — 225,428 (19,786 ) 242,022 Depreciation 20,891 — 113,612 — 134,503 Amortization 4,598 — 56,288 — 60,886 Impairment loss on real estate assets 6,195 — 37,106 — 43,301 General and administrative 29,645 341 35,923 (35,563 ) 30,346 97,709 341 468,357 (55,349 ) 511,058 Real estate operating income/(loss) (17,052 ) (341 ) 54,859 36,245 73,711 Other income (expense): Interest expense (51,704 ) — (33,540 ) 11,246 (73,998 ) Other income/(expense) 12,600 — 211 (11,246 ) 1,565 Net recoveries/(loss) from casualty events and litigation settlements 23 — (301 ) — (278 ) Equity in income of unconsolidated joint ventures 553 — — — 553 (38,528 ) — (33,630 ) — (72,158 ) Income/(loss) from continuing operations (55,580 ) (341 ) 21,229 36,245 1,553 Discontinued operations: Operating income 15 — 69 — 84 Loss on sale of real estate assets (1 ) — — — (1 ) Income from discontinued operations 14 — 69 — 83 Gain on sale of real estate assets 45,225 — 84,458 — 129,683 Net income/(loss) (10,341 ) (341 ) 105,756 36,245 131,319 Less: Net income applicable to noncontrolling interest — — (15 ) — (15 ) Net income/(loss) applicable to Piedmont $ (10,341 ) $ (341 ) $ 105,741 $ 36,245 $ 131,304 Condensed Consolidated Statements of Income (As Revised, See Note 2) For the year ended December 31, 2014 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Revenues: Rental income $ 72,843 $ — $ 386,995 $ (5,203 ) $ 454,635 Tenant reimbursements 16,566 — 93,516 (534 ) 109,548 Property management fee revenue — — 16,516 (14,447 ) 2,069 89,409 — 497,027 (20,184 ) 566,252 Expenses: Property operating costs 42,621 — 217,786 (20,976 ) 239,431 Depreciation 23,512 — 115,084 — 138,596 Amortization 4,754 — 51,825 — 56,579 General and administrative 23,235 300 28,232 (27,942 ) 23,825 94,122 300 412,927 (48,918 ) 458,431 Real estate operating income/(loss) (4,713 ) (300 ) 84,100 28,734 107,821 Other income (expense): Interest expense (47,355 ) — (39,625 ) 12,534 (74,446 ) Other income/(expense) 11,944 — 652 (12,534 ) 62 Net recoveries from casualty events and litigation settlements 1,322 1,479 4,191 — 6,992 Equity in loss of unconsolidated joint ventures (350 ) — — — (350 ) (34,439 ) 1,479 (34,782 ) — (67,742 ) Income/(loss) from continuing operations (39,152 ) 1,179 49,318 28,734 40,079 Discontinued operations: Operating income 913 — 41 — 954 Gain on sale of real estate assets 70 — 192 — 262 Income from discontinued operations 983 — 233 — 1,216 Gain on sale of real estate assets — — 870 — 870 Net income/(loss) (38,169 ) 1,179 50,421 28,734 42,165 Less: Net income applicable to noncontrolling interest — — (15 ) — (15 ) Net income/(loss) applicable to Piedmont $ (38,169 ) $ 1,179 $ 50,406 $ 28,734 $ 42,150 Condensed Consolidated Statements of Cash Flows (As Restated, See Note 2) For the year ended December 31, 2016 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Net Cash Provided By/(Used In) Operating Activities $ (26,260 ) $ 5,214 $ 221,195 $ 35,660 $ 235,809 Cash Flows from Investing Activities: Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals (5,060 ) — (454,836 ) — (459,896 ) Intercompany note receivable 440 — (71,900 ) 71,460 — Net sales proceeds from wholly-owned properties 200,220 — 165,698 — 365,918 Deferred lease costs paid (2,758 ) — (23,138 ) — (25,896 ) Net cash provided by/(used in) investing activities 192,842 — (384,176 ) 71,460 (119,874 ) Cash Flows from Financing Activities: Debt issuance costs paid (264 ) — — — (264 ) Proceeds from debt 695,000 — — — 695,000 Repayments of debt (538,000 ) — (168,875 ) — (706,875 ) Intercompany note payable (9,600 ) — 81,060 (71,460 ) — Costs of issuance of common stock — (342 ) — — (342 ) Shares withheld to pay tax obligations related to employee stock compensation — (2,344 ) — — (2,344 ) Repurchases of common stock as part of announced plan — (7,943 ) — — (7,943 ) (Distributions to)/repayments from affiliates (312,218 ) 97,016 250,862 (35,660 ) — Dividends paid and discount on dividend reinvestments — (91,601 ) (15 ) — (91,616 ) Net cash provided by/(used in) financing activities (165,082 ) (5,214 ) 163,032 (107,120 ) (114,384 ) Net increase in cash and cash equivalents 1,500 — 51 — 1,551 Cash and cash equivalents, beginning of year 2,174 150 3,117 — 5,441 Cash and cash equivalents, end of year $ 3,674 $ 150 $ 3,168 $ — $ 6,992 Condensed Consolidated Statements of Cash Flows (As Restated, See Note 2) For the year ended December 31, 2015 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Net Cash Provided By/(Used In) Operating Activities $ (27,077 ) $ 4,699 $ 205,177 $ 36,245 $ 219,044 Cash Flows from Investing Activities: Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals (12,203 ) — (489,241 ) — (501,444 ) Intercompany note receivable 72,000 — — (72,000 ) — Redemption of noncontrolling interest in unconsolidated variable interest entity — — (4,000 ) — (4,000 ) Net sales proceeds from wholly-owned properties 151,557 — 696,612 — 848,169 Deferred lease costs paid (3,792 ) — (33,891 ) — (37,683 ) Net cash provided by/(used in) investing activities 207,562 — 169,480 (72,000 ) 305,042 Cash Flows from Financing Activities: Debt issuance costs paid (575 ) — (506 ) — (1,081 ) Proceeds from debt 1,142,577 — 159,281 — 1,301,858 Repayments of debt (1,438,000 ) — (106,301 ) — (1,544,301 ) Intercompany note payable — — (72,000 ) 72,000 — Costs of issuance of common stock — (326 ) — — (326 ) Shares withheld to pay tax obligations related to employee stock compensation — (1,710 ) — — (1,710 ) Repurchases of common stock as part of announced plan — (158,860 ) — — (158,860 ) (Distributions to)/repayments from affiliates 109,544 281,073 (354,372 ) (36,245 ) — Dividends paid and discount on dividend reinvestments — (126,516 ) (15 ) — (126,531 ) Net cash provided by/(used in) financing activities (186,454 ) (6,339 ) (373,913 ) 35,755 (530,951 ) Net increase/(decrease) in cash and cash equivalents (5,969 ) (1,640 ) 744 — (6,865 ) Cash and cash equivalents, beginning of year 8,143 1,790 2,373 — 12,306 Cash and cash equivalents, end of year $ 2,174 $ 150 $ 3,117 $ — $ 5,441 Condensed Consolidated Statements of Cash Flows (As Revised, See Note 2) For the year ended December 31, 2014 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Net Cash Provided by Operating Activities $ 5,448 $ 4,088 $ 178,889 $ 28,733 $ 217,158 Cash Flows from Investing Activities: Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals (23,541 ) — (267,918 ) — (291,459 ) Intercompany note receivable 650 — — (650 ) — Net sales proceeds from wholly-owned properties 29,519 — 16,713 — 46,232 Net sales proceeds received from unconsolidated joint ventures 6,017 — — — 6,017 Investments in unconsolidated joint ventures (42 ) — — — (42 ) Deferred lease costs paid (4,472 ) — (23,222 ) — (27,694 ) Net cash provided by/(used in) investing activities 8,131 — (274,427 ) (650 ) (266,946 ) Cash Flows from Financing Activities: Debt issuance costs paid (1,294 ) — — — (1,294 ) Proceeds from debt 1,052,527 — — — 1,052,527 Repayments of debt (238,000 ) — (575,702 ) — (813,702 ) Discount due to loan modification (1,135 ) — — — (1,135 ) Intercompany note payable — — (650 ) 650 — Shares withheld to pay tax obligations related to employee stock compensation — (1,275 ) — (1,275 ) Repurchases of common stock as part of announced plan — (54,802 ) — — (54,802 ) (Distributions to)/repayments from affiliates (820,795 ) 178,812 670,716 (28,733 ) — Dividends paid and discount on dividend reinvestments — (125,183 ) (15 ) — (125,198 ) Net cash provided by/(used in) financing activities (8,697 ) (2,448 ) 94,349 (28,083 ) 55,121 Net increase/(decrease) in cash and cash equivalents 4,882 1,640 (1,189 ) — 5,333 Cash and cash equivalents, beginning of year 3,261 150 3,562 — 6,973 Cash and cash equivalents, end of year $ 8,143 $ 1,790 $ 2,373 $ — $ 12,306

Subsequent events

Subsequent events	12 Months Ended
	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent events	Subsequent events Declaration of Dividend for the First Quarter 2017 On February 8, 2017 , the board of directors of Piedmont declared dividends for the first quarter 2017 in the amount of $0.21 per share on its common stock to stockholders of record as of the close of business on February 24, 2017 . Such dividends are to be paid on March 17, 2017 . Sale of Two Independence Square Subsequent to December 31, 2016, Piedmont entered into a binding contract with limited contingencies to sell Two Independence Square, its 600,000 square foot, 9 -story, office building located in the southwest submarket of Washington, D.C. and 100% leased to the National Aeronautics and Space Administration for $359.6 million ( $593 per square foot). The transaction is expected to close during the first half of 2017.

Schedule III - Real Estate and

Schedule III - Real Estate and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2016
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]
Schedule III - Real Estate and Accumulated Depreciation	Schedule III - Real Estate and Accumulated Depreciation December 31, 2016 (dollars in thousands) Initial Cost Gross Amount at Which Carried at December 31, 2016 Description Location Ownership Percentage Encumbrances Land Buildings and Improvements Total (a) Costs Capitalized Subsequent to Acquisition (b) Land Buildings and Improvements Total (c) Accumulated Depreciation and Amortization Date of Construction Date Acquired Life on which Depreciation and Amortization is Computed (in years) (d) 1430 ENCLAVE PARKWAY Houston, TX 100 % None 7,100 37,915 45,015 2,050 5,506 41,559 47,065 18,517 1994 12/21/2000 0 - 40 CRESCENT RIDGE II Minnetonka, MN 100 % None 7,700 45,154 52,854 7,651 8,021 52,484 60,505 22,236 2000 12/21/2000 0 - 40 1200 CROWN COLONY DRIVE Quincy, MA 100 % None 11,042 40,666 51,708 3,506 11,042 44,172 55,214 18,445 1990 7/30/2001 0 - 40 5601 HIATUS ROAD Tamarac, FL 100 % None 3,642 10,404 14,046 1,721 3,642 12,125 15,767 5,691 2001 12/21/2001 0 - 40 WINDY POINT I Schaumburg, IL 100 % None 4,537 31,847 36,384 2,071 4,537 33,918 38,455 13,116 1999 12/31/2001 0 - 40 WINDY POINT II Schaumburg, IL 100 % None 3,746 55,026 58,772 16,696 3,746 71,722 75,468 26,654 2001 12/31/2001 0 - 40 SARASOTA COMMERCE CENTER II Sarasota, FL 100 % None 1,767 20,533 22,300 2,730 2,203 22,827 25,030 9,652 1999 1/11/2002 0 - 40 2001 NW 64th STREET Ft. Lauderdale, FL 100 % (e) — 7,172 7,172 966 — 8,138 8,138 3,428 2001 4/18/2002 0 - 40 90 CENTRAL STREET Boxborough, MA 100 % None 3,642 29,497 33,139 3,070 3,642 32,567 36,209 13,092 2001 5/3/2002 0 - 40 DESERT CANYON 300 Phoenix, AZ 100 % None 2,602 24,333 26,935 45 2,602 24,378 26,980 9,289 2001 6/4/2002 0 - 40 6031 CONNECTION DRIVE Irving, TX 100 % None 3,157 43,656 46,813 4,305 3,157 47,961 51,118 18,841 1999 8/15/2002 0 - 40 6021 CONNECTION DRIVE Irving, TX 100 % None 3,157 42,662 45,819 10,541 3,157 53,203 56,360 18,207 2000 8/15/2002 0 - 40 6011 CONNECTION DRIVE Irving, TX 100 % None 3,157 29,034 32,191 2,597 3,157 31,631 34,788 13,167 1999 8/15/2002 0 - 40 TWO INDEPENDENCE SQUARE Washington, DC 100 % None 52,711 202,702 255,413 58,844 52,711 261,546 314,257 88,319 1991 11/22/2002 0 - 40 ONE INDEPENDENCE SQUARE Washington, DC 100 % None 29,765 104,814 134,579 24,250 30,562 128,267 158,829 40,467 1991 11/22/2002 0 - 40 2120 WEST END AVENUE Nashville, TN 100 % None 4,908 59,011 63,919 6,671 5,101 65,489 70,590 25,014 2000 11/26/2002 0 - 40 800 NORTH BRAND BOULEVARD Glendale, CA 100 % None 23,605 136,284 159,889 12,937 23,607 149,219 172,826 52,172 1990 12/20/2002 0 - 40 US BANCORP CENTER Minneapolis, MN 100 % None 11,138 175,629 186,767 17,422 11,138 193,051 204,189 65,628 2000 5/1/2003 0 - 40 AUBURN HILLS CORPORATE CENTER Auburn Hills, MI 100 % None 1,978 16,570 18,548 (8,081 ) 1,591 8,876 10,467 4,292 2001 5/9/2003 0 - 40 GLENRIDGE HIGHLANDS TWO Atlanta, GA 100 % None 6,662 69,031 75,693 (17,857 ) 6,662 51,174 57,836 19,919 2000 8/1/2003 0 - 40 Initial Cost Gross Amount at Which Carried at December 31, 2016 Description Location Ownership Percentage Encumbrances Land Buildings and Improvements Total Costs Capitalized Subsequent (b) Land Buildings and Improvements Total Accumulated Depreciation and Amortization Date of Construction Date Acquired Life on which Depreciation and Amortization is Computed (in years) (d) 200 BRIDGEWATER CROSSING Bridgewater, NJ 100 % None 8,182 84,160 92,342 (11,740 ) 8,328 72,274 80,602 25,815 2002 8/14/2003 0 - 40 400 VIRGINIA AVE Washington, DC 100 % None 22,146 49,740 71,886 (792 ) 22,146 48,948 71,094 17,279 1985 11/19/2003 0 - 40 4250 NORTH FAIRFAX DRIVE Arlington, VA 100 % None 13,636 70,918 84,554 4,240 13,636 75,158 88,794 24,989 1998 11/19/2003 0 - 40 1225 EYE STREET (f) Washington, DC 49.5 % 57,600 21,959 47,602 69,561 7,565 21,959 55,167 77,126 17,014 1986 11/19/2003 0 - 40 1201 EYE STREET (g) Washington, DC 49.5 % 82,400 31,985 63,139 95,124 (55 ) 31,984 63,085 95,069 20,043 2001 11/19/2003 0 - 40 1901 MARKET STREET Philadelphia, PA 100 % 160,000 13,584 166,683 180,267 53,684 20,829 213,122 233,951 71,421 1987 12/18/2003 0 - 40 60 BROAD STREET New York, NY 100 % None 32,522 168,986 201,508 12,390 60,708 153,190 213,898 51,381 1962 12/31/2003 0 - 40 1414 MASSACHUSETTS AVENUE Cambridge, MA 100 % None 4,210 35,821 40,031 (284 ) 4,365 35,382 39,747 16,045 1873 1/8/2004 0 - 40 ONE BRATTLE SQUARE Cambridge, MA 100 % None 6,974 64,940 71,914 (2,976 ) 7,113 61,825 68,938 34,237 1991 2/26/2004 0 - 40 600 CORPORATE DRIVE Lebanon, NJ 100 % None 3,934 — 3,934 16,281 3,934 16,281 20,215 6,969 2005 3/16/2004 0 - 40 1075 WEST ENTRANCE DRIVE Auburn Hills, MI 100 % None 5,200 22,957 28,157 (313 ) 5,207 22,637 27,844 8,128 2001 7/7/2004 0 - 40 3100 CLARENDON BOULEVARD Arlington, VA 100 % None 11,700 69,705 81,405 38,680 11,791 108,294 120,085 21,673 1987 12/9/2004 0 - 40 400 BRIDGEWATER CROSSING Bridgewater, NJ 100 % None 10,400 71,052 81,452 (15,626 ) 10,400 55,426 65,826 16,329 2002 2/17/2006 0 - 40 LAS COLINAS CORPORATE CENTER I Irving, TX 100 % None 3,912 18,830 22,742 (3,667 ) 2,543 16,532 19,075 5,065 1998 8/31/2006 0 - 40 LAS COLINAS CORPORATE CENTER II Irving, TX 100 % None 4,496 29,881 34,377 (3,624 ) 2,543 28,210 30,753 8,536 1998 8/31/2006 0 - 40 TWO PIERCE PLACE Itasca, IL 100 % None 4,370 70,632 75,002 10,640 8,156 77,486 85,642 28,680 1991 12/7/2006 0 - 40 2300 CABOT DRIVE Lisle, IL 100 % None 4,390 19,549 23,939 (4,073 ) 4,390 15,476 19,866 4,054 1998 5/10/2007 0 - 40 PIEDMONT POINTE I Bethesda, MD 100 % None 11,200 58,606 69,806 7,371 11,200 65,977 77,177 17,043 2007 11/13/2007 0 - 40 PIEDMONT POINTE II Bethesda, MD 100 % None 13,300 70,618 83,918 8,115 13,300 78,733 92,033 18,682 2008 6/25/2008 0 - 40 Initial Cost Gross Amount at Which Carried at December 31, 2016 Description Location Ownership Percentage Encumbrances Land Buildings and Improvements Total Costs Capitalized Subsequent (b) Land Buildings and Improvements Total Accumulated Depreciation and Amortization Date of Construction Date Acquired Life on which Depreciation and Amortization is Computed (in years) (d) SUWANEE GATEWAY ONE Suwanee, GA 100 % None 1,000 6,875 7,875 3,159 2,401 8,633 11,034 1,533 2008 9/28/2010 0 - 40 ONE MERIDIAN CROSSINGS Richfield, MN 100 % None 2,919 24,398 27,317 318 2,919 24,716 27,635 4,340 1997 10/1/2010 0 - 40 TWO MERIDIAN CROSSINGS Richfield, MN 100 % None 2,661 25,742 28,403 590 2,661 26,332 28,993 4,592 1998 10/1/2010 0 - 40 500 WEST MONROE STREET Chicago, IL 100 % None 36,990 185,113 222,103 42,561 36,990 227,674 264,664 35,293 1991 3/31/2011 0 - 40 THE DUPREE Atlanta, GA 100 % None 4,080 14,310 18,390 877 4,080 15,187 19,267 3,814 1997 4/29/2011 0 - 40 THE MEDICI Atlanta, GA 100 % None 1,780 11,510 13,290 4,988 1,780 16,498 18,278 2,873 2008 6/7/2011 0 - 40 225 PRESIDENTIAL WAY Boston, MA 100 % None 3,626 36,916 40,542 (764 ) 3,612 36,166 39,778 8,150 2000 9/13/2011 0 - 40 235 PRESIDENTIAL WAY Boston, MA 100 % None 4,154 44,048 48,202 (911 ) 4,138 43,153 47,291 9,686 2001 9/13/2011 0 - 40 400 TOWNPARK Lake Mary, FL 100 % None 2,570 20,555 23,125 3,555 2,570 24,110 26,680 4,107 2008 11/10/2011 0 - 40 ARLINGTON GATEWAY Arlington, VA 100 % None 36,930 129,070 166,000 1,384 36,930 130,454 167,384 19,186 2005 3/4/2013 0 40 5 & 15 WAYSIDE ROAD Burlington, MA 100 % None 7,190 55,445 62,635 1,536 7,190 56,981 64,171 7,917 1999 / 2001 3/22/2013 0 40 5301 MARYLAND WAY Brentwood, TN 100 % None 5,740 9,717 15,457 (1,768 ) 5,740 7,949 13,689 581 1989 8/12/2013 0 40 6565 MACARTHUR BOULEVARD Irving, TX 100 % None 4,820 37,767 42,587 512 4,820 38,279 43,099 5,115 1998 12/5/2013 0 40 ONE LINCOLN PARK Dallas, TX 100 % None 6,640 44,810 51,450 1,383 6,640 46,193 52,833 5,121 1999 12/20/2013 0 40 161 CORPORATE CENTER Irving, TX 100 % None 2,020 10,680 12,700 130 2,020 10,810 12,830 1,814 1998 12/30/2013 0 40 5 WALL STREET Burlington, MA 100 % 31,583 9,560 50,276 59,836 — 9,560 50,276 59,836 6,271 2008 6/27/2014 0 40 1155 PERIMETER CENTER WEST Atlanta, GA 100 % None 5,870 66,849 72,719 5 5,870 66,854 72,724 7,039 2000 8/28/2014 0 40 PARK PLACE ON TURTLE CREEK Dallas, TX 100 % None 4,470 38,048 42,518 1,778 4,470 39,826 44,296 3,603 1986 1/16/2015 0 40 80 CENTRAL STREET Boxborough, MA 100 % None 1,980 8,930 10,910 40 1,980 8,970 10,950 998 1988 7/24/2015 0 40 ENCLAVE PLACE Houston, TX 100 % None 1,890 60,094 61,984 3,716 1,890 63,810 65,700 1,994 2015 N/A 0 40 SUNTRUST CENTER Orlando, FL 100 % None 11,660 139,015 150,675 (192 ) 11,660 138,823 150,483 6,981 1988 11/4/2015 0 40 GALLERIA 300 Atlanta, GA 100 % None 4,000 73,554 77,554 1,003 4,000 74,557 78,557 4,329 1987 11/4/2015 0 40 GLENRIDGE HIGHLANDS ONE Atlanta, GA 100 % None 5,960 50,013 55,973 886 5,960 50,899 56,859 3,078 1998 11/24/2015 0 40 Initial Cost Gross Amount at Which Carried at December 31, 2016 Description Location Ownership Percentage Encumbrances Land Buildings and Improvements Total Costs Capitalized Subsequent (b) Land Buildings and Improvements Total Accumulated Depreciation and Amortization Date of Construction Date Acquired Life on which Depreciation and Amortization is Computed (in years) (d) CNL CENTER I Orlando, FL 99 % None 6,470 77,858 84,328 (263 ) 6,470 77,595 84,065 1,505 1999 8/1/2016 0 40 CNL CENTER II Orland, FL 99 % None 4,550 55,609 60,159 754 4,550 56,363 60,913 1,106 2006 8/1/2016 0 40 ONE WAYSIDE ROAD Boston, MA 100 % None 6,240 57,124 63,364 — 6,240 57,124 63,364 1,643 1997 / 2008 8/10/2016 0 40 GALLERIA 200 Atlanta, GA 100 % None 6,470 55,825 62,295 (24 ) 6,470 55,801 62,271 768 1984 10/7/2016 0 40 750 WEST JOHN CARPENTER FREEWAY (h) Irving, TX 100 % None 7,860 36,303 44,163 — 7,860 36,303 44,163 219 1999 11/30/2016 0 40 PIEDMONT POWER, LLC (i) Bridgewater, NJ 100 % None — 79 79 2,740 — 2,819 2,819 534 N/A 12/20/2011 0 - 40 UNDEVELOPED LAND PARCELS (j) Various 100 % None 18,061 — 18,061 24,904 18,061 24,904 42,965 6 N/A Various N/A Total—Consolidated REIT Properties $ 632,277 $ 3,792,292 $ 4,424,569 $ 360,848 $ 669,848 $ 4,115,569 $ 4,785,417 $ 1,053,725 Initial Cost Gross Amount at Which Carried at December 31, 2016 Description Location Ownership Percentage Encumbrances Land Buildings and Improvements Total Costs Capitalized Subsequent (b) Land Buildings and Improvements Total Accumulated Depreciation and Amortization Date of Construction Date Acquired Life on which Depreciation and Amortization is Computed (in years) (d) 8560 UPLAND DRIVE Englewood, CO 72 % None 1,954 11,216 13,170 1,438 2,048 12,560 14,608 4,979 2001 12/21/2001 0 - 40 Total – Unconsolidated JV Properties $ 1,954 $ 11,216 $ 13,170 $ 1,438 $ 2,048 $ 12,560 $ 14,608 $ 4,979 Total – All Properties $ 634,231 $ 3,803,508 $ 4,437,739 $ 362,286 $ 671,896 $ 4,128,129 $ 4,800,025 $ 1,058,704 (a) Total initial cost excludes purchase price allocated to intangible lease origination costs and intangible lease liabilities. (b) Includes write-offs of fully depreciated/amortized capitalized assets. (c) The net carrying value of Piedmont’s total assets for federal income tax purposes is approximately $4.3 billion . (d) Piedmont’s assets are depreciated or amortized using the straight-lined method over the useful lives of the assets by class. Generally, Tenant Improvements and Lease Intangibles are amortized over the lease term. Generally, Building Improvements are depreciated over 5 - 25 years, Land Improvements are depreciated over 20 - 25 years, and Buildings are depreciated over 40 years. (e) Property is owned subject to a long-term ground lease. (f) As a result of its 49.5% membership interest in 1225 Eye Street, N.W. Associates, LLC, Piedmont owns 49.5% of the 1225 Eye Street building. Piedmont is deemed to have control over the joint venture and, as such, consolidates the joint venture, including the building. (g) As a result of its 49.5% membership interest in 1201 Eye Street, N.W. Associates, LLC, Piedmont owns 49.5% of the 1201 Eye Street building. Piedmont is deemed to have control over the joint venture and, as such, consolidates the joint venture, including the building. (h) As part of the acquisition of the property, Piedmont purchased an adjoining, developable land parcel of 3.5 acres for $1.0 million . (i) Represents solar panels at the 400 Bridgewater Crossing building. (j) Undeveloped Land Parcels includes land parcels which Piedmont may develop in the future, as well as the initial development costs of the 500 TownPark building. Piedmont Office Realty Trust, Inc. Schedule III - Real Estate and Accumulated Depreciation December 31, 2016 (dollars in thousands) 2016 2015 2014 Real Estate: Balance at the beginning of the year $ 4,725,096 $ 5,267,615 $ 5,038,005 Additions to/improvements of real estate 422,908 452,106 316,991 Assets disposed (296,319 ) (926,592 ) (71,627 ) Assets impaired (1) (30,898 ) (40,169 ) — Write-offs of intangible assets (2) (11,896 ) (7,768 ) (9,723 ) Write-offs of fully depreciated/amortized assets (8,866 ) (20,096 ) (6,031 ) Balance at the end of the year $ 4,800,025 $ 4,725,096 $ 5,267,615 Accumulated Depreciation and Amortization: Balance at the beginning of the year $ 1,019,663 $ 1,182,556 $ 1,060,885 Depreciation and amortization expense 155,274 155,009 156,808 Assets disposed (95,471 ) (290,038 ) (19,383 ) Write-offs of intangible assets (2) (11,896 ) (7,768 ) (9,723 ) Write-offs of fully depreciated/amortized assets (8,866 ) (20,096 ) (6,031 ) Balance at the end of the year $ 1,058,704 $ 1,019,663 $ 1,182,556 (1) Does not include impairment loss recognized on other assets as a result of the allocation of goodwill (See Note 2 ). (2) Consists of write-offs of intangible lease assets related to lease restructurings, amendments and terminations.

Summary of Significant Accoun30

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Basis of Presentation	Piedmont’s consolidated financial statements are prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and include the accounts of Piedmont, Piedmont’s wholly-owned subsidiaries, any variable interest entity ("VIE") of which Piedmont or any of its wholly-owned subsidiaries is considered to have the power to direct the activities of the entity and the obligation to absorb losses/right to receive benefits, or any entity in which Piedmont or any of its wholly-owned subsidiaries owns a controlling interest. In determining whether Piedmont or Piedmont OP has a controlling interest, the following factors, among others, are considered: equity ownership, voting rights, protective rights of investors, and participatory rights of investors.
Principles of Consolidation	Piedmont owns interests in two real properties through its ownership in 1201 Eye Street, N.W. Associates, LLC and 1225 Eye Street, N.W. Associates, LLC. Piedmont has evaluated these entities based on the criteria outlined above and concluded that these entities are VIEs, but that Piedmont has a controlling interest in both entities through its 100% ownership in Piedmont Washington Properties, Inc. Accordingly, Piedmont’s consolidated financial statements include the accounts of 1201 Eye Street, NW Associates, LLC and 1225 Eye Street, NW Associates, LLC. Additionally, during the year ended December 31, 2016 Piedmont purchased a 99% interest in a joint venture which owns the CNL Center I and CNL Center II buildings in Orlando, Florida. Piedmont evaluated its interest in the joint venture based on the same criteria mentioned above and concluded that it is not a VIE; however, the joint venture is consolidated under the voting model due to Piedmont's 99% ownership interest. As of December 31, 2016 , Piedmont also owned an interest in a property through an unconsolidated joint venture partnership. Although Piedmont is the majority equity participant in this joint venture, Piedmont and its co-venturer exercise joint control over the property. As a result, in accordance with GAAP, the accounts of this joint venture are not consolidated, but rather accounted for using the equity method of accounting in Piedmont’s consolidated financial statements. Please refer to Note 7 for a summary of Piedmont’s interests in and consolidation treatment of its various VIEs as of December 31, 2016 . All inter-company balances and transactions have been eliminated upon consolidation. Further, Piedmont has formed special purpose entities to acquire and hold real estate. Each special purpose entity is a separate legal entity and consequently the assets of the special purpose entities are not available to all creditors of Piedmont. The assets owned by these special purpose entities are being reported on a consolidated basis with Piedmont’s assets for financial reporting purposes only.
Use of Estimates	Use of Estimates The preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying consolidated financial statements and notes. Actual results could differ from those estimates.
Real Estate Assets	Real Estate Assets Piedmont classifies its real estate assets as long-lived assets held for use or as long-lived assets held for sale. Held for use assets are stated at cost, as adjusted for any impairment loss, less accumulated depreciation. Held for sale assets are carried at lower of depreciated cost or estimated fair value, less estimated costs to sell. Piedmont generally reclassifies assets as held for sale once a sales contract has been executed and earnest money has become non-refundable. Amounts capitalized to real estate assets consist of the cost of acquisition or construction, any tenant improvements or major improvements, betterments that extend the useful life of the related asset, and transaction costs. All repairs and maintenance are expensed as incurred. Additionally, Piedmont capitalizes interest while the development, or redevelopment, of a real estate asset is in progress. Approximately $4.6 million , $3.8 million , and $2.1 million of interest was capitalized for the years ended December 31, 2016 , 2015 , and 2014 , respectively. Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives: Buildings 40 years Building improvements 5-25 years Land improvements 20-25 years Tenant allowances Lease term Furniture, fixtures, and equipment 3-5 years Intangible lease assets Lease term Piedmont continually monitors events and changes in circumstances that could indicate that the carrying amounts of the real estate and related intangible assets of both operating properties and properties under construction in which Piedmont has an ownership interest, either directly or through investments in joint ventures, may not be recoverable. For wholly owned properties, when indicators of potential impairment are present, or when a sale in the near term is considered more than 50% probable, management assesses whether the respective carrying values will be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition for assets held for use, or from the estimated fair values, less costs to sell, for assets held for sale. In the event that the expected undiscounted future cash flows for assets held for use or the estimated fair value, less costs to sell, for assets held for sale do not exceed the respective asset carrying value, management adjusts such assets to the respective estimated fair values and recognizes an impairment loss. Estimated fair values are calculated based on the following information, depending upon availability, in order of preference: (i) recently quoted market prices, (ii) market prices for comparable properties, or (iii) the present value of undiscounted cash flows, including estimated sales value (which is based on key assumptions such as estimated market rents, lease-up periods, estimated lease terms, and capitalization and discount rates) less estimated selling costs. For properties owned as part of an investment in an unconsolidated joint venture, Piedmont assesses the estimated fair value of its investment as compared to its carrying amount. If Piedmont determines that the carrying value is greater than the estimated fair value at any measurement date, Piedmont must also determine if such a difference is temporary in nature. Value fluctuations which are “other than temporary” in nature are then recorded to adjust the carrying value to the estimated fair value amount in the period in which such determination is made.
Fair Value of Assets and Liabilities of Acquired Properties	Fair Value of Assets and Liabilities of Acquired Properties Upon the acquisition of real properties, Piedmont records the fair value of properties as tangible assets, consisting of land and building, and identified intangible assets and liabilities, consisting of the value of above-market and below-market leases and the value of in-place leases, based on their estimated fair values. The estimated fair values of the tangible assets of an acquired property (which includes land and building) are determined by valuing the property as if it were vacant, and the “as-if-vacant” value is then allocated to land and building based on management’s determination of the estimated fair value of these assets. Management relies on a sales comparison approach using closed land sales and listings in determining the land value, and determines the as-if-vacant estimated fair value of a property using methods similar to those used by independent appraisers. Factors considered by management in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, management includes real estate taxes, insurance, and other operating expenses and estimates of lost rental revenue during the expected lease-up periods based on current market demand. Management also estimates the cost to execute similar leases including leasing commissions, legal, and other related costs. The estimated fair values of above-market and below-market in-place leases are recorded based on the present value (using an interest rate which reflects the risks associated with the leases acquired) of the difference between (i) the contractual amounts to be paid pursuant to the in-place leases and (ii) management’s estimate of market rates for the corresponding in-place leases, measured over a period equal to the remaining terms of the leases, taking into consideration the probability of renewals for any below-market leases. The capitalized above-market and below-market lease values are recorded as intangible lease assets or liabilities and amortized as an adjustment to rental revenues over the remaining terms of the respective leases. The estimated fair values of in-place leases include an estimate of the direct costs associated with obtaining the acquired or "in place" tenant, estimates of opportunity costs associated with lost rentals that are avoided by acquiring an in-place lease. The amount capitalized as direct costs associated with obtaining a tenant include commissions, tenant improvements, and other direct costs and are estimated based on management’s consideration of current market costs to execute a similar lease. These direct lease origination costs are included in deferred lease costs in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases. The value of opportunity costs is calculated using the contractual amounts to be paid pursuant to the in-place leases over a market absorption period for a similar lease. These lease intangibles are included in intangible lease assets in the accompanying consolidated balance sheets and are amortized to expense over the remaining terms of the respective leases.
Investments in and Amounts Due from Unconsolidated Joint Ventures	Investments in and Amounts Due from Unconsolidated Joint Ventures Piedmont’s investment in its one unconsolidated joint venture is recorded using the equity method of accounting, whereby original investments are recorded at cost and subsequently adjusted for contributions, distributions, net income/(loss), and "other than temporary" impairment losses, if any, attributable to such joint ventures. Pursuant to the terms of the unconsolidated joint venture agreement, all income and distributions are allocated to the joint venture partners in accordance with their respective ownership interests. Distributions from the unconsolidated joint venture are generally distributed to the partners on a quarterly basis and are classified on the accompanying consolidated statements of cash flow using the nature of distribution approach. Distributions of net cash from operations are classified as cash inflows from operating activities, as they are presumed to be returns on Piedmont’s investment in the joint venture. Proceeds received as the result of a sale of an asset from an unconsolidated joint venture are considered a return of Piedmont’s investment in the joint venture and classified as cash inflows from investing activities. Due from unconsolidated joint venture represents operating distributions due to Piedmont from its investment in the unconsolidated joint venture which have been declared but not received as of period end.
Cash and Cash Equivalents	Cash and Cash Equivalents Piedmont considers all highly-liquid investments purchased with an original maturity of three months or less to be cash equivalents. Cash equivalents include cash and short-term investments. Short-term investments consist of investments in money market accounts stated at cost, which approximates estimated fair value, and available-for-sale securities resulting from Piedmont's non-qualified deferred compensation program carried at estimated fair value.
Tenant Receivables, net and Straight-line Rent Receivables	Tenant Receivables, net and Straight-line Rent Receivables Tenant receivables are comprised of rental and reimbursement billings due from tenants, and straight-line rent receivables representing the cumulative amount of future adjustments necessary to present rental income on a straight-line basis. Tenant receivables are recorded at the original amount earned, less an allowance for any doubtful accounts, which approximates estimated fair value. Management assesses the collectibility of tenant receivables on an ongoing basis and provides for allowances as such balances, or portions thereof, become uncollectible. During the year ended December 31, 2016, Piedmont began classifying provisions for/(recoveries of) bad debts as property operating costs in the accompanying consolidated statements of income to include such expenses as a component of operating the underlying properties. Previously, such costs were presented as general and administrative expenses.
Restricted Cash and Escrows	Restricted Cash and Escrows Restricted cash and escrows principally relate to the following types of items: • escrow accounts held by lenders to pay future real estate taxes, insurance, debt service, and tenant improvements; • net sales proceeds from property sales held by qualified intermediary for potential Section 1031 exchange; • earnest money paid in connection with future acquisitions; and • security and utility deposits paid by tenants per the terms of their respective leases. Restricted cash and escrows are generally reclassified to other asset or liability accounts upon being used to purchase assets, satisfy obligations, or settle tenant obligations.
Prepaid Expenses and Other Assets	Prepaid Expenses and Other Assets Prepaid expenses and other assets are primarily comprised of the following items: • prepaid property taxes, insurance and operating costs; • deferred common area maintenance costs which will be reimbursed by tenants over specified time periods; • receivables which are unrelated to tenants, for example, insurance proceeds receivable from insurers related to casualty losses; and • equipment, furniture and fixtures, and tenant improvements for Piedmont’s corporate office and property management office space, net of accumulated depreciation. Prepaid expenses and other assets will be expensed as utilized or depreciated in the case of Piedmont's corporate assets. Balances without a future economic benefit are expensed as they are identified. Deferred common area maintenance costs are amortized to property operating costs as the related reimbursement income is recognized over the period specified in the respective lease.
Goodwill	Goodwill Goodwill is the excess of cost of an acquired entity over the amounts specifically assigned to assets acquired and liabilities assumed in purchase accounting for business combinations. Piedmont tests the carrying value of its goodwill for impairment on an annual basis, or on an interim basis if an event occurs or circumstances change that would indicate the carrying amount may be impaired. Such interim circumstances may include, but are not limited to, significant adverse changes in legal factors or in the general business climate, adverse action or assessment by a regulator, unanticipated competition, the loss of key personnel, or persistent declines in an entity’s stock price below carrying value of the entity. Piedmont first assesses qualitative factors to determine whether the existence of events or circumstances leads to a determination that it is more likely than not that the estimated fair value of the reporting unit is less than its carrying amount. If, after assessing the totality of events or circumstances, Piedmont concludes that the estimated fair value is greater than the carrying amount, then performing a further two-step impairment test is unnecessary. However, if Piedmont chooses to forgo the availability of the qualitative analysis, the test prescribed by authoritative accounting guidance is a two-step test. The first step involves comparing the estimated fair value of the entity to its carrying value, including goodwill. Estimated fair value is determined by adjusting the trading price of the stock for a control premium, if necessary, multiplied by the common shares outstanding. If such calculated estimated fair value exceeds the carrying value, no further procedures or analysis is required. However, if the carrying value exceeds the calculated fair value, goodwill is potentially impaired and step two of the analysis would be required. Step two of the test involves calculating the implied fair value of goodwill by deducting the estimated fair value of all tangible and intangible net assets of the entity from the entity’s estimated fair value calculated in step one of the test. If the implied value of the goodwill (the remainder left after deducting the estimated fair values of the entity from its calculated overall estimated fair value in step one of the test) is less than the carrying value of goodwill, an impairment loss would be recognized.
Accounting Pronouncements Adopted and Other Recent Accounting Pronouncements	Accounting Pronouncements Adopted during the Year Ended December 31, 2016 As of January 1, 2016, Piedmont early adopted the provisions of Financial Accounting Standards Board (the "FASB") Accounting Standards Update No. 2016-09, Compensation- Stock Compensation (Topic 718) Improvements to Employee Share-Based Payment Accounting ("ASU 2016-09"). The provisions in ASU 2016-09 simplify the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The implementation of ASU 2016-09 resulted in the reclassification of approximately $1.7 million and $1.3 million related to income tax consequences for share-based compensation from cash outflows from operating activities to cash outflows from financing activities in the accompanying consolidated statements of cash flows for the years ended December 31, 2015 and 2014, respectively. Additionally, as of January 1, 2016, Piedmont also adopted Accounting Standards Update No. 2015-05, Intangibles- Goodwill and Other- Internal-Use Software (Subtopic 350-40) “Customer’s Accounting for Fees Paid in a Cloud Computing Arrangement on a prospective basis, and Accounting Standards Update No. 2016-15, Statement of Cash Flows (Topic 230), Classification of Certain Cash Receipts and Cash Payments ("ASU 2016-15") on a retrospective basis. Piedmont had previously reported applicable transactions on its consolidated statement of cash flows in accordance with the clarifying provisions of ("ASU 2016-09"); therefore, there are no reclassifications associated with adoption. Finally, as of October 1, 2016, Piedmont early adopted the amended definition of a business described in Accounting Standards Update No. 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business on a prospective basis. As a result of the revised definition of a business, individual assets are no longer considered a “business” as defined by GAAP. Accordingly, portions of our goodwill balance will no longer be allocated to individual assets that do not qualify as a “business” when they are sold or classified as held for sale. Further, acquisition costs associated with acquisitions of individual assets that do not qualify as business combinations under ASC No. 2017-01 will be capitalized, rather than expensed. Other Recent Accounting Pronouncements The FASB has issued Accounting Standards Update No. 2016-05, Derivatives and Hedging (Topic 815), Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships ("ASU 2016-05"). The amendments in ASU 2016-05 clarify that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument does not, in and of itself, require de-designation of that hedging relationship provided that all other hedge accounting criteria continue to be met. The amendments in ASU 2016-05 are effective in the first quarter of 2017, and Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption. The FASB has issued Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09") and Accounting Standards Update No. 2016-08, Revenue from Contracts with Customers (Topic 606) Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ("ASU 2016-08"). The amendments in ASU 2014-09, which are further clarified in ASU 2016-08, as well as Accounting Standards Update 2016-10 and Accounting Standards Update 2016-12 (collectively the "Revenue Recognition Amendments"), change the criteria for the recognition of certain revenue streams to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services using a five-step determination process. Steps 1 through 5 involve (i) identifying contracts with a customer, (ii) identifying the performance obligations in the contract, (iii) determining the transaction price, (iv) allocating the transaction price to the performance obligations, and (v) recognizing revenue as an entity satisfies a performance obligation. The revenues impacted by the Revenue Recognition Amendments include a portion of Piedmont's tenant reimbursement revenues and property management fee revenues. Lease contracts and reimbursement revenues associated with property taxes and insurance are specifically excluded from the Revenue Recognition Amendments. The Revenue Recognition Amendments are effective in the first quarter of 2018 for Piedmont. Management has substantially completed its initial assessment of the impact of adoption of the Revenue Recognition Amendments. Approximately 90% of Piedmont's total revenues are derived from either long-term leases with its tenants or reimbursement of property tax and insurance expenses, which are excluded from the scope of the Revenue Recognition Amendments. In addition, based on management's assessment to date, Piedmont does not expect the timing of the recognition of reimbursement revenue and revenue from management agreements to change as a result of the new guidance, though certain classifications may change. As a result, although management continues to evaluate the guidance and disclosures required by the Revenue Recognition Amendments, Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption. The FASB has issued Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"). The amendments in ASU 2016-01 require equity investments, except those accounted for under the equity method of accounting, to be measured at estimated fair value with changes in fair value recognized in net income. Additionally, ASU 2016-01 simplifies the impairment assessment of equity investments, and eliminates certain disclosure requirements. The amendments in ASU 2016-01 are effective in the first quarter of 2018, and Piedmont is currently evaluating the potential impact of adoption. The FASB has issued Accounting Standards Update No. 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash (a consensus of the FASB Emerging Issues Task Force) ("ASU 2016-18"). The provisions of ASU 2016-18 require entities to show changes in restricted cash and cash equivalents in addition to cash and cash equivalents in the statement of cash flows. As a result, entities will no longer present transfers between restricted and unrestricted cash in the statement of cash flows. ASU 2016-18 is effective for Piedmont in the first quarter of 2018, with early adoption permitted. Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption. The FASB has issued Accounting Standards Update No. 2016-02, Leases (Topic 842), ("ASU 2016-02"). The amendments in ASU 2016-02 fundamentally change the definition of a lease, as well as the accounting for operating leases by requiring lessees to recognize assets and liabilities which arise from the lease, consisting of a liability to make lease payments (the lease liability) and a right-of-use asset, representing the right to use the leased asset over the term of the lease. Accounting for leases by lessors is substantially unchanged from prior practice as lessors will continue to recognize lease revenue on a straight-line basis. The amendments in ASU 2016-02 are effective in the first quarter of 2019, and Piedmont is currently evaluating the potential impact of adoption. The FASB has issued Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). The provisions of ASU 2016-13 replace the "incurred loss" approach with an "expected loss" model for impairing trade and other receivables, held-to-maturity debt securities, net investment in leases, and off-balance-sheet credit exposures, which will generally result in earlier recognition of allowances for credit losses. Additionally, the provisions change the classification of credit losses related to available-for-sale securities to an allowance, rather than a direct reduction of the amortized cost of the securities. ASU 2016-13 is effective in the first quarter of 2020, with early adoption permitted as of January 1, 2019. Piedmont is currently evaluating the potential impact of adoption. However, during the period that individual real estate assets qualified as a "business" under GAAP, proportionate amounts of Piedmont's goodwill balance were allocated to the basis of real estate assets sold or classified as held for sale when determining gain or loss on sale or impairment loss on such assets. On October 1, 2016, Piedmont early adopted Accounting Standards Update 2017-01, Business Combinations (Topic 805) Clarifying the Definition of a Business (as further described in “Accounting Pronouncements Adopted during the Year Ended December 31, 2016” below), and as a result, Piedmont is no longer required to allocate a proportionate amount of goodwill to the basis of real estate assets that do not qualify as a business when those assets are sold or classified as held for sale.
Interest Rate Derivatives	Interest Rate Derivatives Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. As of December 31, 2016 and 2015, all of Piedmont's interest rate derivatives were designated as effective cash flow hedges and carried on the balance sheet at estimated fair value. Piedmont reassesses the effectiveness of its derivatives designated as cash flow hedges on a regular basis to determine if they continue to be highly effective and if the forecasted transactions remain highly probable. Piedmont does not use derivatives for trading or speculative purposes. The changes in estimated fair value of interest rate swap agreements designated as effective cash flow hedges are recorded in other comprehensive income (“OCI”), and subsequently reclassified to earnings when the hedged transactions occur. The estimated fair value of the interest rate derivative agreement is recorded as interest rate derivative asset or as interest rate derivative liability in the accompanying consolidated balance sheets. Amounts received or paid under interest rate derivative agreements are recorded as reductions or additions to interest expense in the consolidated income statements as incurred. Additionally, when Piedmont settles forward starting swap agreements, any gain or loss is recorded as accumulated other comprehensive income and is amortized to interest expense over the term of the respective notes on a straight line basis (which approximates the effective interest method). Further, Piedmont classifies cash flows from the settlement of hedging derivative instruments in the same category as the underlying exposure which is being hedged. Settlements resulting from the hedge of Piedmont's exposure to interest rate changes are classified as operating cash flows in the accompanying consolidated statements of cash flows. Risk Management Objective of Using Derivatives In addition to operational risks which arise in the normal course of business, Piedmont is exposed to economic risks such as interest rate, liquidity, and credit risk. In certain situations, Piedmont has entered into derivative financial instruments such as interest rate swap agreements and other similar agreements to manage interest rate risk exposure arising from current or future variable rate debt transactions. Interest rate swap agreements involve the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. Piedmont’s objective in using interest rate derivatives is to add stability to interest expense and to manage its exposure to interest rate movements.
Deferred Lease Costs	Deferred Lease Costs Deferred lease costs are comprised of costs and incentives incurred to acquire operating leases. In addition to direct costs, deferred lease costs also include intangible lease origination costs related to in-place leases acquired as part of a property acquisition and direct payroll costs incurred related to negotiating and executing specific leases. For the years ended December 31, 2016 , 2015 , and 2014 , Piedmont capitalized approximately $0.4 million , $1.0 million , and $0.7 million , respectively, of internal leasing and development costs. Deferred lease costs are amortized on a straight-line basis over the terms of the related underlying leases in the accompanying consolidated statements of income as follows: • Approximately $50.1 million , $42.5 million , and $40.9 million of deferred lease costs for the years ended December 31, 2016 , 2015 , and 2014 , respectively, are included in amortization expense; and • Approximately $3.9 million , $4.7 million , and $4.2 million , of deferred lease costs related to lease incentives granted to tenants for the years ended December 31, 2016 , 2015 , and 2014 , respectively, was included as an offset to rental income. Upon receipt of a lease termination notice, Piedmont adjusts the amortization of any unamortized deferred lease costs to be recognized ratably over the revised remaining term of the lease after giving effect to the termination notice. If there is no remaining lease term and no other obligation to provide the tenant space in the property, then any unamortized tenant-specific costs are recognized immediately upon termination.
Debt	Debt When mortgage debt is assumed upon the acquisition of real property, Piedmont adjusts the loan to estimated fair value with a corresponding adjustment to building and other intangible assets assumed as part of the purchase. The fair value adjustment is amortized to interest expense over the term of the loan using the effective interest method. Piedmont presents all debt issuance costs as a direct deduction from the principal amount of secured and unsecured debt in the accompanying consolidated balance sheets. Piedmont amortizes these costs to interest expense on a straight-line basis (which approximates the effective interest rate method) over the terms of the related financing arrangements. Additionally, Piedmont records debt issuance premiums/discounts as an increase/decrease to the principal amount of the loan in the accompanying consolidated balance sheets, and amortizes such premiums or discounts as a component of interest expense over the life of the underlying loan facility using the effective interest method.
Deferred Income	Deferred income Deferred income is primarily comprised of the following items: • prepaid rent from tenants; and • tenant reimbursements related to operating expense or property tax expenses which may be due to tenants as part of an annual operating expense reconciliation. Deferred income related to prepaid rents from tenants will be recognized as income in the period it is earned. Amounts related to operating expense reconciliations or property tax expense are relieved when the tenant's reconciliation is completed in accordance with the underlying lease, and payment is issued to the tenant.
Shares-in-trust, Preferred Stock, Common Stock, Dividends	Shares-in-trust To date, Piedmont has not issued any shares-in-trust; however, under Piedmont’s charter, it has authority to issue a total of 150,000,000 shares-in-trust, which would be issued only in the event that there is a purported transfer of, or other change in or affecting the ownership of, Piedmont’s capital stock that would result in a violation of the ownership limits that are included in Piedmont’s charter to protect its REIT status. Preferred Stock To date, Piedmont has not issued any shares of preferred stock; however, Piedmont is authorized to issue up to 100,000,000 shares of one or more classes or series of preferred stock. Piedmont’s board of directors may determine the relative rights, preferences, and privileges of any class or series of preferred stock that may be issued, and can be more beneficial than the rights, preferences, and privileges attributable to Piedmont’s common stock. Common Stock Under Piedmont’s charter, it has authority to issue a total of 750,000,000 shares of common stock with a par value of $0.01 per share. Each share of common stock is entitled to one vote and participates in distributions equally. The board of directors of Piedmont authorized in June 2015 the repurchase and retirement of up to $200 million of Piedmont's common stock through June 2017. Piedmont may repurchase the shares from time to time, in accordance with applicable securities laws, in the open market or in privately negotiated transactions. The timing of repurchases is dependent upon market conditions and other factors, and repurchases may be commenced or suspended from time to time in Piedmont's discretion, without prior notice. As of December 31, 2016 , there was approximately $70.2 million in remaining capacity under the program which may be used for share repurchases through June 2017. Dividends As a REIT, Piedmont is required by the Internal Revenue Code of 1986, as amended (the “Code”), to make distributions to stockholders each taxable year equal to at least 90% of its annual taxable income, computed without regard to the dividends-paid deduction and by excluding net capital gains attributable to stockholders (“REIT taxable income”). Piedmont sponsors a dividend reinvestment plan ("DRP") pursuant to which common stockholders may elect (if their brokerage agreements allow) to reinvest an amount equal to the dividends declared on their common shares into additional shares of Piedmont’s common stock in lieu of receiving cash dividends. Under the DRP, Piedmont has the option to either issue shares purchased in the open market or issue shares directly from Piedmont's authorized but unissued shares, in both cases at a 2% discount for the stockholder. Such election takes place at the settlement of each quarterly dividend in which there are participants in the DRP, and may change from quarter to quarter based on management's judgment of the best use of proceeds for Piedmont.
Noncontrolling Interest	Noncontrolling Interest Noncontrolling interest is the equity interest of consolidated entities that are not owned by Piedmont. Noncontrolling interest is adjusted for contributions, distributions, and earnings (losses) applicable to the noncontrolling interest partners of the consolidated joint ventures. All earnings and distributions are allocated to the partners of the consolidated joint ventures in accordance with their respective partnership agreements. Earnings allocated to such noncontrolling interest partners are recorded as income applicable to noncontrolling interest in the accompanying consolidated statements of income. In addition, certain noncontrolling interests are held in the form of equity participation agreements in Piedmont's consolidated variable interest entities. The equity participation agreements include an option to redeem when certain conditions are met. These instruments are re-measured at the redemption amount once the redemption becomes probable and reclassified to a liability once the redemption option is exercised or conditions are met to make the option mandatorily redeemable.
Revenue Recognition	Revenue Recognition All leases of real estate assets held by Piedmont are classified as operating leases, and the related base rental income is recognized on a straight-line basis over the terms of the respective leases. Tenant reimbursements are recognized as revenue in the period that the related operating cost is incurred. Rents and tenant reimbursements collected in advance are recorded as deferred income in the accompanying consolidated balance sheets. Lease termination revenues are recognized ratably as rental revenue over the revised remaining lease term after giving effect to the termination notice. Contingent rental income recognition is deferred until the specific lease-related targets are achieved. Gains on the sale of real estate assets are recognized upon completing the sale and, among other things, determining the sale price and transferring all of the risks and rewards of ownership without significant continuing involvement with the purchaser. Recognition of all or a portion of the gain would be deferred until both of these conditions are met. Losses are primarily recognized through impairment charges when identified.
Stock-based Compensation and Nonqualified Deferred Compensation Plan	Stock-based Compensation Piedmont has issued stock-based compensation in the form of restricted stock to its employees and directors. For employees, such compensation has been issued pursuant to Piedmont's Long-term Incentive Compensation ("LTIC") program. The LTIC program is comprised of an annual restricted stock grant component (the "Restricted Stock Award" program) and a multi-year performance share component (the "Performance Share" program). Awards granted pursuant to the Restricted Stock Award and Performance Share programs, as well as director's awards, are classified as equity awards or liability awards based on the underlying terms of the program agreement. Awards classified as equity awards are expensed straight-line over the vesting period, with issuances recorded as a reduction to additional paid in capital. Awards classified as liability awards are expensed over the service period, with issuances recorded as a reduction to accrued expense. The compensation expense recognized related to both of these award types is recorded as property operating costs for those employees whose job is related to property operation and as general and administrative expense for all other employees and directors in the accompanying consolidated statements of income. Non-qualified Deferred Compensation Plan Additionally, Piedmont has a non-qualified deferred compensation plan which allows certain employees to elect to defer their receipt of compensation, including both cash and stock-based compensation, until future taxable years. Amounts deferred are invested in trading securities held in a "rabbi trust" and are measured using quoted market prices as of the reporting date. As of December 31, 2016, Piedmont held approximately $0.2 million of these trading securities. Such investments are included in cash equivalents due to their short-term, liquid nature, with the corresponding liability included in accounts payable, accrued expenses, dividends payable, and accrued capital expenditures in the accompanying consolidated balance sheets.
Legal Fees and Related Insurance Recoveries	Legal Fees and Related Insurance Recoveries Piedmont recognizes legal expenses in the period in which services are rendered as a component of general and administrative expense for routine corporate matters or as property operating costs for legal expenses attributable to operating properties. Insurance reimbursements related to ongoing legal matters are recorded as a reduction of legal expense in the period that the insurance company definitively notifies Piedmont of its intent to issue payment.
Casualty Losses and Litigation Settlement Expense and Related Insurance Recoveries	Casualty Losses and Litigation Settlement Expense and Related Insurance Recoveries From time to time, specific assets may be damaged or destroyed by natural disasters. Such damages may result in significant expenses related to the destruction of fixed assets or costs to clean, repair, and establish emergency operations at the building or buildings affected by the casualty event. In addition, Piedmont may recognize expenses as a result of issuing rent abatements to tenants for business interruptions caused by the tenants' inability to access the space that they lease from Piedmont. Further, during the year ended December 31, 2012, Piedmont settled two separate securities class action lawsuits. Losses related to the above items are estimated and recorded in the period incurred without regard to whether the loss may be ultimately recoverable under Piedmont's various insurance policies. Any related insurance recoveries are recorded as income in the period that the insurance company definitively notifies Piedmont of its intent to issue payment.
Discontinued Operations and Disclosures of Disposals of Components of an Entity	Discontinued Operations and Disclosures of Disposals of Components of an Entity During the year ended December 31,2014, Piedmont adopted the amendments of Accounting Standards Update No. 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity ("ASU 2014-08") which changed the criteria for reporting discontinued operations. Gains and losses on sales related to properties that do not meet the revised definition of discontinued operations and the operational results of these properties are included in income from continuing operations for all periods presented, while the gain on sale is presented in accordance with SEC Rule 3-15 of Regulation S-X in the accompanying consolidated statements of income between discontinued operations and net income. These gains and/or losses, however, are included in continuing operations for purposes of calculating earnings per share data. Operational results related to properties sold or held for sale prior to the adoption of ASU 2014-08 continue to be presented as discontinued operations as the adoption provisions of ASU 2014-08 required prospective implementation.
Net Income Available to Common Stockholders Per Share	Net Income Available to Common Stockholders Per Share Net income per share-basic is calculated as net income available to common stockholders divided by the weighted average number of common shares outstanding during the period. Net income per share-diluted is calculated as net income available to common stockholders divided by the diluted weighted average number of common shares outstanding during the period, including the dilutive effect of nonvested restricted stock. The dilutive effect of nonvested restricted stock is calculated using the treasury stock method to determine the number of additional common shares that would become outstanding if the remaining unvested restricted stock awards vested.
Income Taxes	Income Taxes Piedmont has elected to be taxed as a REIT under the Code, and has operated as such, beginning with its taxable year ended December 31, 1998. To qualify as a REIT, Piedmont must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its annual REIT taxable income. As a REIT, Piedmont is generally not subject to federal income taxes, subject to fulfilling, among other things, this distribution requirement. Piedmont is subject to certain taxes related to the operations of properties in certain locations, as well as operations conducted by its taxable REIT subsidiary, POH, which have been provided for in the financial statements. Accordingly, the only provision for federal income taxes in the accompanying consolidated financial statements relates to POH. POH did not have significant tax provisions or deferred income tax items. These operations resulted in approximately $415,000 , $85,000 , and $0 in income tax expense for the years ended December 31, 2016 , 2015 , and 2014 , respectively, as a component of other income/(expense) in the accompanying consolidated statements of income. Further, Piedmont is subject to certain state and local taxes related to the operations of properties in certain locations, which have been provided for in general and administrative expenses in the accompanying consolidated financial statements.
Reclassifications	Reclassifications Certain prior period amounts have been reclassified to conform to the current period financial statement presentation. The reclassifications relate to: (i) properties classified as held for sale as of March 31, 2016, June 30, 2016, or September 30, 2016, have been reclassified as held for sale as of December 31, 2015 for comparative purposes (see Note 15 ); and (ii) provisions for/(recoveries of) bad debts have been reclassified from general and administrative expenses to property operating costs in the accompanying consolidated statements of income for comparative purposes. (see Tenant Receivables, net and Straight-line Rent Receivables above).

Restatement (Tables)

Restatement (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Changes and Error Corrections [Abstract]
Schedule of Error Corrections and Prior Period Adjustments	The following table presents the consolidated balance sheet as previously reported, restatement adjustments, and the consolidated balance sheet as restated as of December 31, 2016 (in thousands, except per share data): As Previously Filed Restatement Adjustments As Restated Assets: Real estate assets, at cost: Land $ 669,848 $ — $ 669,848 Buildings and improvements, less accumulated depreciation 2,927,324 — 2,927,324 Intangible lease assets, less accumulated amortization 99,695 — 99,695 Construction in progress 34,825 — 34,825 Real estate assets held for sale, net — — — Total real estate assets 3,731,692 3,731,692 Investment in and amounts due from unconsolidated joint venture 7,360 — 7,360 Cash and cash equivalents 6,992 — 6,992 Tenant receivables, net of allowance for doubtful accounts 26,494 — 26,494 Straight-line rent receivables 165,848 — 165,848 Notes receivable — — — Restricted cash and escrows 1,212 — 1,212 Prepaid expenses and other assets 23,655 — 23,655 Goodwill 180,097 (81,179 ) 98,918 Deferred lease costs, less accumulated amortization 305,997 — 305,997 Other assets held for sale, net — — — Total assets $ 4,449,347 $ (81,179 ) $ 4,368,168 Liabilities: Unsecured debt, net of discount and unamortized debt issuance costs $ 1,687,731 $ — $ 1,687,731 Secured debt, net of premiums and unamortized debt issuance costs 332,744 — 332,744 Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures 165,410 — 165,410 Deferred income 28,406 — 28,406 Intangible lease liabilities, less accumulated amortization 48,005 — 48,005 Interest rate swaps 8,169 — 8,169 Total liabilities 2,270,465 — 2,270,465 Commitments and Contingencies — — — Stockholders’ Equity: Shares-in-trust — — — Preferred stock — — — Common stock 1,452 — 1,452 Additional paid-in capital 3,673,128 — 3,673,128 Cumulative distributions in excess of earnings (1,499,684 ) (81,179 ) (1,580,863 ) Other comprehensive income 2,104 — 2,104 Piedmont stockholders’ equity 2,177,000 (81,179 ) 2,095,821 Noncontrolling interest 1,882 — 1,882 Total stockholders’ equity 2,178,882 (81,179 ) 2,097,703 Total liabilities and stockholders’ equity $ 4,449,347 $ (81,179 ) $ 4,368,168 The following table presents the consolidated balance sheet as previously reported, restatement adjustments, and the consolidated balance sheet as restated as of December 31, 2015 (in thousands, except per share data): As Previously Filed Restatement Adjustments As Restated Assets: Real estate assets, at cost: Land $ 676,091 $ — $ 676,091 Buildings and improvements, less accumulated depreciation 2,837,463 — 2,837,463 Intangible lease assets, less accumulated amortization 84,663 — 84,663 Construction in progress 20,975 — 20,975 Real estate assets held for sale, net 76,614 — 76,614 Total real estate assets 3,695,806 3,695,806 Investment in and amounts due from unconsolidated joint venture 7,577 — 7,577 Cash and cash equivalents 5,441 — 5,441 Tenant receivables, net of allowance for doubtful accounts 26,339 — 26,339 Straight-line rent receivables 147,393 — 147,393 Notes receivable 45,400 — 45,400 Restricted cash and escrows 5,174 — 5,174 Prepaid expenses and other assets 24,777 — 24,777 Goodwill 180,097 (75,311 ) 104,786 Deferred lease costs, less accumulated amortization 288,041 — 288,041 Other assets held for sale, net 8,490 2,287 10,777 Total assets $ 4,434,535 $ (73,024 ) $ 4,361,511 Liabilities: Unsecured debt, net of discount and unamortized debt issuance costs $ 1,528,221 $ — $ 1,528,221 Secured debt, net of premiums and unamortized debt issuance costs 501,289 — 501,289 Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures 128,465 — 128,465 Deferred income 27,270 — 27,270 Intangible lease liabilities, less accumulated amortization 42,853 — 42,853 Interest rate swaps 9,993 — 9,993 Total liabilities 2,238,091 2,238,091 Commitments and Contingencies — — — Stockholders’ Equity: Shares-in-trust — — — Preferred stock — — — Common stock 1,455 — 1,455 Additional paid-in capital 3,669,977 — 3,669,977 Cumulative distributions in excess of earnings (1,477,674 ) (73,024 ) (1,550,698 ) Other comprehensive income 1,661 — 1,661 Piedmont stockholders’ equity 2,195,419 (73,024 ) 2,122,395 Noncontrolling interest 1,025 — 1,025 Total stockholders’ equity 2,196,444 (73,024 ) 2,123,420 Total liabilities and stockholders’ equity $ 4,434,535 $ (73,024 ) $ 4,361,511 The following table presents the consolidated statement of income as previously reported, restatement adjustments, and the consolidated statement of income as restated for the year ended December 31, 2016 (in thousands, except share and per share data): As Previously Filed Restatement Adjustments As Restated Revenues: Rental income $ 459,890 $ — $ 459,890 Tenant reimbursements 93,961 — 93,961 Property management fee revenue 1,864 — 1,864 555,715 — 555,715 Expenses: Property operating costs 218,934 — 218,934 Depreciation 127,733 — 127,733 Amortization 75,119 — 75,119 Impairment loss on real estate assets 30,898 3,003 33,901 General and administrative 29,244 — 29,244 481,928 3,003 484,931 Real estate operating income 73,787 (3,003 ) 70,784 Other income (expense): Interest expense (64,860 ) — (64,860 ) Other income/(expense) (13 ) — (13 ) Net recoveries/(loss) from casualty events and litigation settlements 34 — 34 Equity in income/(loss) of unconsolidated joint ventures 362 — 362 (64,477 ) — (64,477 ) Income from continuing operations 9,310 (3,003 ) 6,307 Discontinued operations: Operating income — — — Gain/(loss) on sale of real estate assets — — — Income from discontinued operations — — — Gain on sale of real estate assets 98,562 (5,152 ) 93,410 Net income 107,872 (8,155 ) 99,717 Less: Net loss/(income) applicable to noncontrolling interest 15 — 15 Net income applicable to Piedmont $ 107,887 $ (8,155 ) $ 99,732 Per share information— basic and diluted: Income from continuing operations and gain on sale of real estate assets $ 0.74 $ (0.05 ) $ 0.69 Income from discontinued operations — — — Net income applicable to common stockholders $ 0.74 $ (0.05 ) $ 0.69 Weighted-average shares outstanding—basic 145,230,382 145,230,382 Weighted-average shares outstanding—diluted 145,634,953 145,634,953 The following table presents the consolidated statement of income as previously reported, restatement adjustments, and the consolidated statement of income as restated for the year ended December 31, 2015 (in thousands, except share and per share data): As Previously Filed Restatement Adjustments As Restated Revenues: Rental income $ 468,872 $ — $ 468,872 Tenant reimbursements 113,881 — 113,881 Property management fee revenue 2,016 — 2,016 584,769 — 584,769 Expenses: Property operating costs 242,022 — 242,022 Depreciation 134,503 — 134,503 Amortization 60,886 — 60,886 Impairment loss on real estate assets 40,169 3,132 43,301 General and administrative 30,346 — 30,346 507,926 3,132 511,058 Real estate operating income 76,843 (3,132 ) 73,711 Other income (expense): Interest expense (73,998 ) — (73,998 ) Other income/(expense) 1,565 — 1,565 Net recoveries/(loss) from casualty events and litigation settlements (278 ) — (278 ) Equity in income/(loss) of unconsolidated joint ventures 553 — 553 (72,158 ) — (72,158 ) Income from continuing operations 4,685 (3,132 ) 1,553 Discontinued operations: Operating income 84 — 84 Gain/(loss) on sale of real estate assets (1 ) — (1 ) Income from discontinued operations 83 — 83 Gain on sale of real estate assets 168,237 (38,554 ) 129,683 Net income 173,005 (41,686 ) 131,319 Less: Net loss/(income) applicable to noncontrolling interest (15 ) — (15 ) Net income applicable to Piedmont $ 172,990 $ (41,686 ) $ 131,304 Per share information— basic and diluted: Income from continuing operations and gain on sale of real estate assets $ 1.15 $ (0.28 ) $ 0.87 Income from discontinued operations — — — Net income applicable to common stockholders $ 1.15 $ (0.28 ) $ 0.87 Weighted-average shares outstanding—basic 150,537,757 150,537,757 Weighted-average shares outstanding—diluted 150,880,116 150,880,116 The following table presents the consolidated statement of income as previously reported, revision adjustments, and the consolidated statement of income as revised for the year ended December 31, 2014 (in thousands, except share and per share data): As Previously Filed Revision Adjustments As Revised Revenues: Rental income $ 454,635 $ — $ 454,635 Tenant reimbursements 109,548 — 109,548 Property management fee revenue 2,069 — 2,069 566,252 — 566,252 Expenses: Property operating costs 239,431 — 239,431 Depreciation 138,596 — 138,596 Amortization 56,579 — 56,579 Impairment loss on real estate assets — — — General and administrative 23,825 — 23,825 458,431 — 458,431 Real estate operating income 107,821 — 107,821 Other income (expense): Interest expense (74,446 ) — (74,446 ) Other income/(expense) 62 — 62 Net recoveries/(loss) from casualty events and litigation settlements 6,992 — 6,992 Equity in income/(loss) of unconsolidated joint ventures (350 ) — (350 ) (67,742 ) — (67,742 ) Income from continuing operations 40,079 — 40,079 Discontinued operations: Operating income 954 — 954 Gain/(loss) on sale of real estate assets 1,198 (936 ) 262 Income from discontinued operations 2,152 (936 ) 1,216 Gain on sale of real estate assets 1,132 (262 ) 870 Net income 43,363 (1,198 ) 42,165 Less: Net loss/(income) applicable to noncontrolling interest (15 ) — (15 ) Net income applicable to Piedmont $ 43,348 $ (1,198 ) $ 42,150 Per share information— basic and diluted: Income from continuing operations and gain on sale of real estate assets $ 0.27 $ (0.01 ) $ 0.26 Income from discontinued operations 0.01 — 0.01 Net income applicable to common stockholders $ 0.28 $ (0.01 ) $ 0.27 Weighted-average shares outstanding—basic 154,452,121 154,452,121 Weighted-average shares outstanding—diluted 154,585,273 154,585,273 The following table presents the consolidated statement of cash flows as previously reported, restatement adjustments, and the consolidated statement of cash flows as restated for the year ended December 31, 2016 (in thousands): As Previously Filed Restatement Adjustments As Restated Cash Flows from Operating Activities: Net income $ 107,872 $ (8,155 ) $ 99,717 Operating distributions received from unconsolidated joint ventures 579 — 579 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 127,733 — 127,733 Amortization of debt issuance costs 1,702 — 1,702 Other amortization 74,373 — 74,373 Impairment loss on real estate assets 30,898 3,003 33,901 Stock compensation expense 7,928 — 7,928 Equity in loss/(income) of unconsolidated joint ventures (362 ) — (362 ) Gain on sale of real estate assets, net (98,562 ) 5,152 (93,410 ) Changes in assets and liabilities: Increase in tenant and straight-line rent receivables, net (26,747 ) — (26,747 ) Decrease/(increase) in restricted cash and escrows 3,229 — 3,229 Decrease/(increase) in prepaid expenses and other assets 1,996 — 1,996 Increase/(decrease) in accounts payable and accrued expenses 3,729 — 3,729 Increase/(decrease) in deferred income 1,441 — 1,441 Net cash provided by operating activities 235,809 — 235,809 Cash Flows from Investing Activities: Acquisition of real estate assets, net of related debt assumed, and intangibles (349,668 ) — (349,668 ) Capitalized expenditures, net of accruals (110,228 ) — (110,228 ) Net sale proceeds from wholly-owned properties 365,918 — 365,918 Deferred lease costs paid (25,896 ) — (25,896 ) Net cash provided by/(used in) investing activities (119,874 ) — (119,874 ) Cash Flows from Financing Activities: Debt issuance costs paid (264 ) — (264 ) Proceeds from debt 695,000 — 695,000 Repayments of debt (706,875 ) — (706,875 ) Costs of issuance of common stock (342 ) — (342 ) Shares withheld to pay tax obligations related to employee stock compensation (2,344 ) — (2,344 ) Repurchases of common stock as part of announced plan (7,943 ) — (7,943 ) Dividends paid and discount on dividend reinvestments (91,616 ) — (91,616 ) Net cash provided by/(used in) financing activities (114,384 ) — (114,384 ) Net increase/(decrease) in cash and cash equivalents 1,551 — 1,551 Cash and cash equivalents, beginning of year 5,441 — 5,441 Cash and cash equivalents, end of year $ 6,992 $ — $ 6,992 The following table presents the consolidated statement of cash flows as previously reported, restatement adjustments, and the consolidated statement of cash flows as restated for the year ended December 31, 2015 (in thousands): As Previously Filed Restatement Adjustments As Restated Cash Flows from Operating Activities: Net income $ 173,005 $ (41,686 ) $ 131,319 Operating distributions received from unconsolidated joint ventures 774 — 774 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 134,503 — 134,503 Amortization of debt issuance costs 1,768 — 1,768 Gain/(loss) on settlement of forward starting interest rate swaps (1,284 ) — (1,284 ) Other amortization 61,221 — 61,221 Impairment loss on real estate assets 40,169 3,132 43,301 Stock compensation expense 8,789 — 8,789 Equity in loss/(income) of unconsolidated joint ventures (553 ) — (553 ) Gain on sale of real estate assets, net (168,237 ) 38,554 (129,683 ) Changes in assets and liabilities: Increase in tenant and straight-line rent receivables, net (29,478 ) — (29,478 ) Decrease/(increase) in restricted cash and escrows (5,256 ) — (5,256 ) Decrease/(increase) in prepaid expenses and other assets (828 ) — (828 ) Increase/(decrease) in accounts payable and accrued expenses (162 ) — (162 ) Increase/(decrease) in deferred income 4,613 — 4,613 Net cash provided by operating activities 219,044 — 219,044 Cash Flows from Investing Activities: Acquisition of real estate assets, net of related debt assumed, and intangibles (382,773 ) — (382,773 ) Capitalized expenditures, net of accruals (118,671 ) — (118,671 ) Redemption of noncontrolling interest in unconsolidated variable interest entity (4,000 ) — (4,000 ) Net sale proceeds from wholly-owned properties 848,169 — 848,169 Deferred lease costs paid (37,683 ) — (37,683 ) Net cash provided by/(used in) investing activities 305,042 — 305,042 Cash Flows from Financing Activities: Debt issuance costs paid (1,081 ) — (1,081 ) Proceeds from debt 1,301,858 — 1,301,858 Repayments of debt (1,544,301 ) — (1,544,301 ) Costs of issuance of common stock (326 ) — (326 ) Shares withheld to pay tax obligations related to employee stock compensation (1,710 ) — (1,710 ) Repurchases of common stock as part of announced plan (158,860 ) — (158,860 ) Dividends paid and discount on dividend reinvestments (126,531 ) — (126,531 ) Net cash provided by/(used in) financing activities (530,951 ) — (530,951 ) Net increase/(decrease) in cash and cash equivalents (6,865 ) — (6,865 ) Cash and cash equivalents, beginning of year 12,306 — 12,306 Cash and cash equivalents, end of year $ 5,441 $ — $ 5,441 The following table presents the consolidated statement of cash flows as previously reported, revision adjustments, and the consolidated statement of cash flows as revised for the year ended December 31, 2014 (in thousands): As Previously Filed Revision Adjustments As Revised Cash Flows from Operating Activities: Net income $ 43,363 $ (1,198 ) $ 42,165 Operating distributions received from unconsolidated joint ventures 266 — 266 Adjustments to reconcile net income to net cash provided by operating activities: Depreciation 138,679 — 138,679 Amortization of debt issuance costs 1,578 — 1,578 Gain/(loss) on settlement of forward starting interest rate swaps 14,960 — 14,960 Other amortization 56,327 — 56,327 Stock compensation expense 5,250 — 5,250 Equity in loss/(income) of unconsolidated joint ventures 350 — 350 Gain on sale of real estate assets, net (2,330 ) 1,198 (1,132 ) Retirement of shares returned from escrow (1,479 ) — (1,479 ) Changes in assets and liabilities: Increase in tenant and straight-line rent receivables, net (40,505 ) — (40,505 ) Decrease/(increase) in restricted cash and escrows (135 ) — (135 ) Decrease/(increase) in prepaid expenses and other assets (1,884 ) — (1,884 ) Increase/(decrease) in accounts payable and accrued expenses 2,995 — 2,995 Increase/(decrease) in deferred income (277 ) — (277 ) Net cash provided by operating activities 217,158 — 217,158 Cash Flows from Investing Activities: Acquisition of real estate assets, net of related debt assumed, and intangibles (117,418 ) — (117,418 ) Net cash held in escrow for acquisitions (5,150 ) — (5,150 ) Capitalized expenditures, net of accruals (168,891 ) — (168,891 ) Net sale proceeds from wholly-owned properties 46,232 — 46,232 Net sale proceeds received from unconsolidated joint ventures 6,017 — 6,017 Investments in unconsolidated joint ventures (42 ) — (42 ) Deferred lease costs paid (27,694 ) — (27,694 ) Net cash provided by/(used in) investing activities (266,946 ) — (266,946 ) Cash Flows from Financing Activities: Debt issuance costs paid (1,294 ) — (1,294 ) Proceeds from debt 1,052,527 — 1,052,527 Repayments of debt (813,702 ) — (813,702 ) Discount paid due to loan modification (1,135 ) — (1,135 ) Shares withheld to pay tax obligations related to employee stock compensation (1,275 ) — (1,275 ) Repurchases of common stock as part of announced plan (54,802 ) — (54,802 ) Dividends paid and discount on dividend reinvestments (125,198 ) — (125,198 ) Net cash provided by/(used in) financing activities 55,121 — 55,121 Net increase/(decrease) in cash and cash equivalents 5,333 — 5,333 Cash and cash equivalents, beginning of year 6,973 — 6,973 Cash and cash equivalents, end of year $ 12,306 $ — $ 12,306

Summary of Significant Accoun32

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2016
Accounting Policies [Abstract]
Property, Plant and Equipment	Piedmont’s real estate assets are depreciated or amortized using the straight-line method over the following useful lives: Buildings 40 years Building improvements 5-25 years Land improvements 20-25 years Tenant allowances Lease term Furniture, fixtures, and equipment 3-5 years Intangible lease assets Lease term
Schedule of Finite-Lived Intangible Assets by Major Class	Gross intangible assets and liabilities, inclusive of amounts classified as real estate assets held for sale, recorded at acquisition as of December 31, 2016 and 2015 , respectively, are as follows (in thousands): December 31, 2016 December 31, 2015 Intangible Lease Assets: Above-Market In-Place Lease Assets $ 25,425 $ 23,684 In-Place Lease Valuation $ 183,422 $ 153,991 Intangible Lease Origination Costs (included as component of Deferred Lease Costs) $ 261,075 $ 208,497 Intangible Lease Liabilities (Below-Market In-Place Leases) $ 97,230 $ 85,168
Amortization Of Intangible Lease Costs	For the years ended December 31, 2016 , 2015 , and 2014 , respectively, Piedmont recognized amortization of intangible lease costs as follows (in thousands): 2016 2015 2014 Amortization of Intangible Lease Origination Costs and In-Place Lease Valuation included in amortization expense $ 58,150 $ 42,278 $ 36,007 Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues $ 5,066 $ 4,571 $ 4,727
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	Net intangible assets and liabilities as of December 31, 2016 will be amortized as follows (in thousands): Intangible Lease Assets Above-Market In-Place Lease Valuation Intangible Lease Origination Costs (1) Below-Market In-place Lease Liabilities For the year ending December 31: 2017 $ 2,590 $ 24,511 $ 33,791 $ 9,138 2018 1,600 17,980 27,156 8,470 2019 910 13,646 22,205 7,270 2020 156 9,614 16,786 5,670 2021 104 8,447 14,731 5,468 Thereafter 227 19,910 36,451 11,989 $ 5,587 $ 94,108 $ 151,120 $ 48,005 Weighted-Average Amortization Period (in years) 3 6 7 7 (1) Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets.
Schedule of Goodwill	The following table presents a reconciliation of the Company’s goodwill from January 1, 2007 to December 31, 2016 (in thousands): Balance as of January 1, 2007 $ — Purchase of property management companies results in Goodwill (April 2007) 180,097 Goodwill allocated to disposition of real estate assets for the years ended December 31, 2007, 2008, 2009 — Balance as of December 31, 2009 180,097 Goodwill allocated to impairment loss on real estate assets (2,557 ) Balance as of December 31, 2010 177,540 Goodwill allocated to disposition of real estate assets (17,533 ) Balance as of December 31, 2011 160,007 Goodwill allocated to disposition of real estate assets (4,303 ) Balance as of December 31, 2012 155,704 Goodwill allocated to disposition of real estate assets (4,412 ) Goodwill allocated to impairment loss on real estate assets (1,335 ) Balance as of December 31, 2013 149,957 Goodwill allocated to disposition of real estate assets (1,198 ) Balance as of December 31, 2014 148,759 Goodwill allocated to disposition of real estate assets (38,554 ) Goodwill allocated to impairment loss on real estate assets (3,132 ) Goodwill allocated to other assets held for sale (2,287 ) Balance as of December 31, 2015 104,786 Goodwill allocated to disposition of real estate assets (5,152 ) Goodwill allocated to impairment loss on real estate assets (716 ) Balance as of December 31, 2016 $ 98,918

Acquisitions and Development 33

Acquisitions and Development Projects (Tables)	12 Months Ended
	Dec. 31, 2016
Business Combinations [Abstract]
Schedule of Business Acquisitions, by Acquisition	During the year ended December 31, 2016 , Piedmont acquired three properties and a 99% interest in a joint venture owning two properties using proceeds from the sales of other properties, proceeds from the $500 Million Unsecured 2015 Line of Credit, and cash on hand, as follows: Property Metropolitan Statistical Area Date of Acquisition Ownership Percentage Acquired Rentable Square Feet (Unaudited) Percentage Leased as of Acquisition (Unaudited) Net Contractual Purchase Price (in millions) CNL Center I and CNL Center II Orlando, Florida August 1, 2016 99 % 622,488 95 % $ 166.7 One Wayside Road Boston, Massachusetts August 10, 2016 100 % 200,605 100 % $ 62.9 Galleria 200 Atlanta, Georgia October 7, 2016 100 % 431,614 89 % $ 69.6 750 West John Carpenter Freeway (1) Dallas, Texas November 30, 2016 100 % 314,714 78 % $ 50.6 (1) Including 3.5 acres of adjacent developable land.

Unconsolidated Joint Venture (T

Unconsolidated Joint Venture (Tables)	12 Months Ended
	Dec. 31, 2016
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Equity Method Investments	As of December 31, 2016 and 2015 , Piedmont owned an interest in the following unconsolidated joint venture (in thousands): Joint Venture Property Held by Joint Venture Piedmont’s Ownership Piedmont's Investment in Unconsolidated Joint Venture 2016 2015 Fund XIII and REIT Joint Venture 8560 Upland Drive 72% $ 7,360 $ 7,368

Debt (Tables)

Debt (Tables)	12 Months Ended
	Dec. 31, 2016
Debt Disclosure [Abstract]
Schedule of Debt	The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2016 and 2015 (in thousands): Facility (1) Stated Rate Effective Rate (2) Maturity Amount Outstanding as of 2016 2015 Secured (Fixed) $125 Million Fixed-Rate Loan 5.50 % 5.50 % 4/1/2016 $ — $ 125,000 $42.5 Million Fixed-Rate Loan 5.70 % 5.70 % 10/11/2016 — 42,525 $140 Million WDC Fixed-Rate Loans (3) 5.76 % 5.76 % 11/1/2017 140,000 140,000 $35 Million Fixed-Rate Loan (4) 5.55 % 3.75 % 9/1/2021 31,583 32,445 $160 Million Fixed-Rate Loan (5) 3.48 % 3.58 % 7/5/2022 160,000 160,000 Net premium and unamortized debt issuance costs 1,161 1,319 Subtotal/Weighted Average (6) 4.64 % 332,744 501,289 Unsecured (Variable and Fixed) $170 Million Unsecured 2015 Term Loan (7) LIBOR + 1.125% 1.78 % 5/15/2018 170,000 170,000 $300 Million Unsecured 2013 Term Loan LIBOR + 1.20% 2.78 % 1/31/2019 300,000 300,000 $500 Million Unsecured 2015 Line of Credit (7) LIBOR + 1.00% 1.74 % 6/18/2019 (8) 178,000 21,000 $300 Million Unsecured 2011 Term Loan LIBOR + 1.15% 3.35 % 1/15/2020 300,000 300,000 $350 Million Unsecured Senior Notes 3.40 % 3.43 % 6/01/2023 350,000 350,000 $400 Million Unsecured Senior Notes 4.45 % 4.10 % 3/15/2024 400,000 400,000 Discounts and unamortized debt issuance costs (10,269) (12,779) Subtotal/Weighted Average (6) 3.19 % 1,687,731 1,528,221 Total/Weighted Average (6) 3.43 % $ 2,020,475 $ 2,029,510 (1) Other than the $35 Million Fixed-Rate Loan, all of Piedmont’s outstanding debt as of December 31, 2016 and 2015 is interest-only. (2) Effective rate after consideration of settled or in place interest rate swap agreements and/or issuance premiums or discounts. (3) Collateralized by the 1201 and 1225 Eye Street buildings in Washington, D.C. (4) Collateralized by the 5 Wall Street building in Burlington, Massachusetts. (5) Collateralized by the 1901 Market Street building in Philadelphia, Pennsylvania. (6) Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates in the table as of December 31, 2016 . (7) On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length LIBOR locks. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating. (8) Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided Piedmont is not then in default and upon payment of extension fees.
Schedule of Maturities of Long-term Debt	A summary of the aggregate maturities of Piedmont’s indebtedness as of December 31, 2016 , is provided below (in thousands): 2017 $ 140,834 2018 170,960 2019 479,014 (1) 2020 301,072 2021 27,702 Thereafter 910,000 Total $ 2,029,582 (1) Includes the balance outstanding as of December 31, 2016 of the $500 Million Unsecured 2015 Line of Credit. However, Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided Piedmont is not then in default and upon payment of extension fees.

Variable Interest Entities an36

Variable Interest Entities and Equity Participation Rights (Tables)	12 Months Ended
	Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Variable Interest Entities	A summary of Piedmont’s interests in, and consolidation treatment of, its VIEs and their related carrying values as of December 31, 2016 and 2015 is as follows (net carrying amount in millions): Entity Piedmont’s % Ownership of Entity Related Building Consolidated/ Unconsolidated Net Carrying Amount as of December 31, 2016 Net Carrying Amount as of December 31, 2015 Primary Beneficiary Considerations 1201 Eye Street N.W. Associates, LLC 49.5 % 1201 Eye Street Consolidated $ (6.7 ) $ (7.4 ) In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building. 1225 Eye Street N.W. Associates, LLC 49.5 % 1225 Eye Street Consolidated $ 9.9 $ 3.8 In accordance with the partnership’s governing documents, Piedmont is entitled to 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building. Piedmont 500 W. Monroe Fee, LLC 100 % 500 W. Monroe Consolidated $ 262.4 $ 251.4 The Omnibus Agreement with the previous owner includes equity participation rights for the previous owner, if certain financial returns are achieved; however, Piedmont has sole decision making authority and is entitled to 100% of the economic benefits of the property until such returns are met.

Derivative Instruments (Tables)

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2016
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Notional Amounts of Outstanding Derivative Positions	A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2016 is as follows: Interest Rate Derivatives: Number of Swap Agreements Associated Debt Instrument Notional Amount (in millions) Effective Date Maturity Date Interest rate swaps 4 $300 Million Unsecured 2013 Term Loan 200 1/30/2014 1/31/2019 Interest rate swaps 2 $300 Million Unsecured 2013 Term Loan 100 8/29/2014 1/31/2019 Interest rate swaps 3 $300 Million Unsecured 2011 Term Loan 300 11/22/2016 1/15/2020 Total $ 600
Schedule of Interest Rate Derivatives	A detail of Piedmont’s interest rate derivatives on a gross and net basis as of December 31, 2016 and 2015 , respectively, is as follows (in thousands): Interest rate swaps classified as: 2016 2015 Gross derivative assets $ — $ — Gross derivative liabilities 8,169 9,993 Net derivative liability $ 8,169 $ 9,993
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	The effective portion of Piedmont's interest rate derivatives, including the gain/(loss) on settlement of forward swaps described above, that was recorded in the accompanying consolidated statements of income for the years ended December 31, 2016 , 2015 , and 2014 , respectively, was as follows (in thousands): Interest Rate Swaps in Cash Flow Hedging Relationships 2016 2015 2014 Amount of gain/(loss) recognized in OCI on derivatives $ (4,126 ) $ (12,509 ) $ (17,122 ) Amount of previously recorded loss reclassified from accumulated OCI into interest expense $ 4,548 $ 5,875 $ 5,145

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2016
Fair Value Disclosures [Abstract]
Fair Value, by Balance Sheet Grouping	The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of December 31, 2016 and 2015 , respectively (in thousands): 2016 2015 Financial Instrument Carrying Value Estimated Fair Value Level Within Fair Value Hierarchy Carrying Value Estimated Fair Value Level Within Fair Value Hierarchy Assets: Cash and cash equivalents (1) $ 6,992 $ 6,992 Level 1 $ 5,441 $ 5,441 Level 1 Tenant receivables, net (1) $ 26,494 $ 26,494 Level 1 $ 26,339 $ 26,339 Level 1 Notes receivable (1) $ — $ — Level 1 $ 45,400 $ 45,400 Level 1 Restricted cash and escrows (1) $ 1,212 $ 1,212 Level 1 $ 5,174 $ 5,174 Level 1 Liabilities: Accounts payable and accrued expenses (1) $ 44,733 $ 44,733 Level 1 $ 13,188 $ 13,188 Level 1 Interest rate swap liability $ 8,169 $ 8,169 Level 2 $ 9,993 $ 9,993 Level 2 Debt, net $ 2,020,475 $ 2,027,436 Level 2 $ 2,029,510 $ 2,039,139 Level 2 (1) For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to its short-term maturity.

Impairment Loss on Real Estat39

Impairment Loss on Real Estate Assets (Tables)	12 Months Ended
	Dec. 31, 2016
Real Estate [Abstract]
Details of Impairment of Long-Lived Assets Held and Used by Asset	Piedmont recorded impairment loss on real estate assets for the years ended December 31, 2016 , 2015 , and 2014 (in thousands): (Restated) (Restated) 2016 2015 2014 Eastpoint I & II (1) $ — $ 6,195 $ — 2 Gatehall Drive (1) — 37,106 — 150 West Jefferson (1) 8,259 — — 9221 Corporate Boulevard (2) 2,692 — — 9200 and 9211 Corporate Boulevard (3) 22,950 — — Total impairment loss on real estate assets (4) $ 33,901 $ 43,301 $ — (1) Piedmont recognized an impairment loss on real estate assets based upon the difference between the carrying value of the asset including a proportionate amount of goodwill and the contracted sales price, less estimated selling costs. (2) Piedmont, using a probability-weighted model heavily weighted towards the short-term sale of the 9221 Corporate Boulevard building in Rockville, Maryland, determined that the carrying value would not be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition. As a result, Piedmont recognized a loss on impairment of approximately $2.7 million during the year ended December 31, 2016 calculated as the difference between the carrying value of the asset including a proportionate amount of goodwill and the anticipated contract sales price, less estimated selling costs. (3) Piedmont elected to sell its remaining two assets and exit the Rockville, Maryland sub-market of Washington, D.C, after selling the 9221 Corporate Boulevard building in July 2016 (mentioned above). Upon management's change in its hold period assumption for the assets from a long-term hold to a near-term sale, Piedmont recognized an impairment loss of approximately $23.0 million . The impairment loss was calculated as the difference between the carrying value of the asset including a proportionate amount of goodwill and the anticipated contracted sales price, less estimated selling costs. (4) The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers. Details of amounts held for sale as of December 31, 2015 are presented below (in thousands): (Restated) December 31, 2016 December 31, 2015 Real estate assets held for sale, net: Land $ — $ 9,759 Building and improvements, less accumulated depreciation of $0 and $32,162 as of December 31, 2016, and 2015, respectively — 66,840 Construction in progress — 15 Total real estate assets held for sale, net $ — $ 76,614 Other assets held for sale, net: Straight-line rent receivables $ — $ 4,729 Prepaid expenses and other assets — 66 Allocation of goodwill (see Note 2) — 2,287 Deferred lease costs, less accumulated amortization of $0 and $1,162 as of December 31, 2016 and 2015, respectively — 3,695 Total other assets held for sale, net $ — $ 10,777

Commitments and Contingencies (

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2016
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	The aggregate payment required under the terms of this operating lease as of December 31, 2016 are presented below (in thousands): 2017 $ 93 2018 93 2019 93 2020 93 2021 93 Thereafter 2,439 Total $ 2,904 The future minimum rental income from Piedmont’s investment in real estate assets under non-cancelable operating leases, excluding unconsolidated joint ventures, as of December 31, 2016 , is presented below (in thousands): Years ending December 31: 2017 $ 434,871 2018 426,532 2019 395,212 2020 359,636 2021 323,940 Thereafter 1,615,265 Total $ 3,555,456

Stock Based Compensation (Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Nonvested Share Activity	A rollforward of Piedmont's equity based award activity for the year ended December 31, 2016 is as follows: Shares Weighted-Average Grant Date Fair Value Unvested and Potential Stock Awards as of December 31, 2015 959,446 $ 18.67 Deferred Stock Awards Granted 319,083 $ 19.96 Decrease in Estimated Potential Future Performance Share Awards, net of forfeitures (2,358 ) $ 21.22 Performance Stock Awards Vested (53,287 ) $ 18.91 Deferred Stock Awards Vested (258,776 ) $ 18.57 Deferred Stock Awards Forfeited (19,885 ) $ 18.29 Unvested and Potential Stock Awards as of December 31, 2016 944,223 $ 19.44 The following table provides additional information regarding stock award activity during the years ended December 31, 2016 , 2015 , and 2014 (in thousands except for per share data): 2016 2015 2014 Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period (per share) $ 19.96 $ 17.59 $ 17.78 Total Grant Date Fair Value of Deferred Stock Vested During the Period $ 4,806 $ 4,239 $ 3,353 Share-based Liability Awards Paid During the Period (1) $ 1,127 $ — $ — (1) Amounts reflect the issuance of performance share awards related to the 2013-15 Performance Share Plan during the period.
Schedule of Outstanding Employee Deferred Stock Awards	A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2016 is as follows: Date of grant Type of Award Net Shares Granted (1) Grant Date Fair Value Vesting Schedule Unvested and Potential Shares as of December 31, 2016 January 3, 2014 Deferred Stock Award 86,512 $ 16.45 Of the shares granted, 20% vested or will vest on January 3, 2015, 2016, 2017, 2018, and 2019, respectively. 52,886 May 9, 2014 Deferred Stock Award 144,625 $ 18.47 Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on May 9, 2015, 2016, and 2017, respectively. 44,047 May 9, 2014 Fiscal Year 2014-2016 Performance Share Program — $ 22.00 Shares awarded, if any, will vest immediately upon determination of award in 2017. 118,448 (2) May 1, 2015 Deferred Stock Award 243,884 $ 17.59 Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on May 1, 2016, 2017, and 2018, respectively. 138,128 May 1, 2015 Fiscal Year 2015-2017 Performance Share Program — $ 18.42 Shares awarded, if any, will vest immediately upon determination of award in 2018. 268,358 (2) May 12, 2016 Deferred Stock Award- Board of Directors 31,368 $ 20.40 Of the shares granted, 100% will vest on May 12, 2017. 31,368 May 24, 2016 Deferred Stock Award 259,957 $ 19.91 Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on May 24, 2017, 2018, and 2019, respectively. 206,380 May 24, 2016 Fiscal Year 2016-2018 Performance Share Program — $ 23.02 Shares awarded, if any, will vest immediately upon determination of award in 2019. 84,608 (2) Total Unvested and Potential Stock Awards 944,223 (1) Amounts reflect the total grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2016 . (2) Estimated based on Piedmont's cumulative TSR for the respective performance period through December 31, 2016 . Share estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.

Earnings Per Share (Tables)

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2016
Earnings Per Share [Abstract]
Schedule of Weighted Average Number of Shares	The following table reconciles the denominator for the basic and diluted earnings per share computations shown on the consolidated statements of operations for the years ended December 31, 2016 , 2015 , and 2014 , as well as common stock issued and outstanding as of the end of the respective periods (in thousands): 2016 2015 2014 Weighted-average common shares—basic 145,230 150,538 154,452 Plus incremental weighted-average shares from time-vested conversions: Deferred and performance stock awards 405 342 133 Weighted-average common shares—diluted 145,635 150,880 154,585 Common stock issued and outstanding as of period end 145,235 145,512 154,324

Operating Leases (Tables)

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2016
Leases [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	The aggregate payment required under the terms of this operating lease as of December 31, 2016 are presented below (in thousands): 2017 $ 93 2018 93 2019 93 2020 93 2021 93 Thereafter 2,439 Total $ 2,904 The future minimum rental income from Piedmont’s investment in real estate assets under non-cancelable operating leases, excluding unconsolidated joint ventures, as of December 31, 2016 , is presented below (in thousands): Years ending December 31: 2017 $ 434,871 2018 426,532 2019 395,212 2020 359,636 2021 323,940 Thereafter 1,615,265 Total $ 3,555,456

Property Dispositions, Assets44

Property Dispositions, Assets Held for Sale and Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2016
Discontinued Operations and Disposal Groups [Abstract]
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	Details of such properties sold are presented below (in thousands), with the calculation of each gain/loss on sale reflecting the allocation of a proportionate amount of goodwill as applicable (see Note 2 for more information): Buildings Sold Location Date of Sale Revised (2014) or Restated Gain/(Loss) on Sale Net Sales Proceeds 2020 West 89th Street Leawood, Kansas May 19, 2014 $ 870 $ 5,515 Two Park Center (1) Hoffman Estates, Illinois May 29, 2014 $ (169 ) $ 6,017 3900 Dallas Parkway Plano, Texas January 30, 2015 $ 8,940 $ 25,803 5601 Headquarters Drive Plano, Texas April 28, 2015 $ 6,390 $ 33,326 River Corporate Center Tempe, Arizona April 29, 2015 $ 4,144 $ 24,223 Copper Ridge Center Lyndhurst, New Jersey May 1, 2015 $ 11,358 $ 50,372 (2) Eastpoint I & II Mayfield Heights, Ohio July 28, 2015 $ (177 ) (4) $ 17,342 3750 Brookside Parkway Alpharetta, Georgia August 10, 2015 $ 761 $ 13,624 Chandler Forum Chandler, Arizona September 1, 2015 $ 13,805 $ 32,267 Aon Center Chicago, Illinois October 29, 2015 $ 84,218 $ 646,243 2 Gatehall Drive Parsippany, New Jersey December 21, 2015 $ 162 (4) $ 50,369 1055 East Colorado Boulevard Pasadena, California April 21, 2016 $ 29,462 $ 60,076 Fairway Center II Brea, California April 28, 2016 $ 14,406 $ 33,062 1901 Main Street Irvine, California May 2, 2016 $ 29,964 $ 63,149 (3) 9221 Corporate Boulevard Rockville, Maryland July 27, 2016 $ (192 ) (4) $ 12,035 150 West Jefferson Detroit, Michigan July 29, 2016 $ (664 ) (4) $ 77,844 9200 and 9211 Corporate Boulevard Rockville, Maryland September 28, 2016 $ (41 ) (4) $ 12,519 11695 Johns Creek Parkway Johns Creek, Georgia December 22, 2016 $ 1,978 $ 13,827 Braker Pointe III Austin, Texas December 29, 2016 $ 18,579 $ 48,006 (1) Property was owned as part of the unconsolidated joint venture, Fund XIII and REIT Joint Venture. As such, the loss on sale was presented as equity in income/(loss) of unconsolidated joint ventures. (2) As part of the transaction, Piedmont accepted a secured promissory note from the buyer for the remaining $45.4 million owed on the sale. During the year ended December 31, 2016, the note receivable was repaid in full and such proceeds are reflected in the accompanying consolidated statements of cash flows as net sales proceeds from the sale of wholly-owned properties. (3) As part of the transaction, Piedmont accepted a secured promissory note from the buyer for $33.0 million , and the note receivable was repaid in full during the year ended December 31, 2016. As such, the full proceeds from the sale of the property are reflected in the accompanying consolidated statements of cash flows as net sales proceeds from the sale of wholly-owned properties. (4) As discussed in Note 10 above, Piedmont recognized an impairment loss prior to, or in conjunction with, the sale of the property. Therefore, any gain/(loss) recognized upon the consummation of the sale consists solely of adjustments made subsequent to the sale for closing cost estimates or post-closing prorations. Details comprising income from discontinued operations are presented below (in thousands): Years Ended December 31, 2016 2015 2014 (Revised) Revenues: Rental income $ — $ 19 $ 1,365 Tenant reimbursements — 64 125 Property management fee revenue — — 1 — 83 1,491 Expenses: Property operating costs — (1 ) 225 Depreciation — — 83 Amortization — — 223 — (1 ) 531 Other income (expense): Other income/(expense) — — (6 ) — — (6 ) Operating income, excluding gain/(loss) on sale of real estate assets — 84 954 Gain/(loss) on sale of real estate assets — (1 ) 262 Income from discontinued operations $ — $ 83 $ 1,216
Details of Impairment of Long-Lived Assets Held and Used by Asset	Piedmont recorded impairment loss on real estate assets for the years ended December 31, 2016 , 2015 , and 2014 (in thousands): (Restated) (Restated) 2016 2015 2014 Eastpoint I & II (1) $ — $ 6,195 $ — 2 Gatehall Drive (1) — 37,106 — 150 West Jefferson (1) 8,259 — — 9221 Corporate Boulevard (2) 2,692 — — 9200 and 9211 Corporate Boulevard (3) 22,950 — — Total impairment loss on real estate assets (4) $ 33,901 $ 43,301 $ — (1) Piedmont recognized an impairment loss on real estate assets based upon the difference between the carrying value of the asset including a proportionate amount of goodwill and the contracted sales price, less estimated selling costs. (2) Piedmont, using a probability-weighted model heavily weighted towards the short-term sale of the 9221 Corporate Boulevard building in Rockville, Maryland, determined that the carrying value would not be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition. As a result, Piedmont recognized a loss on impairment of approximately $2.7 million during the year ended December 31, 2016 calculated as the difference between the carrying value of the asset including a proportionate amount of goodwill and the anticipated contract sales price, less estimated selling costs. (3) Piedmont elected to sell its remaining two assets and exit the Rockville, Maryland sub-market of Washington, D.C, after selling the 9221 Corporate Boulevard building in July 2016 (mentioned above). Upon management's change in its hold period assumption for the assets from a long-term hold to a near-term sale, Piedmont recognized an impairment loss of approximately $23.0 million . The impairment loss was calculated as the difference between the carrying value of the asset including a proportionate amount of goodwill and the anticipated contracted sales price, less estimated selling costs. (4) The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers. Details of amounts held for sale as of December 31, 2015 are presented below (in thousands): (Restated) December 31, 2016 December 31, 2015 Real estate assets held for sale, net: Land $ — $ 9,759 Building and improvements, less accumulated depreciation of $0 and $32,162 as of December 31, 2016, and 2015, respectively — 66,840 Construction in progress — 15 Total real estate assets held for sale, net $ — $ 76,614 Other assets held for sale, net: Straight-line rent receivables $ — $ 4,729 Prepaid expenses and other assets — 66 Allocation of goodwill (see Note 2) — 2,287 Deferred lease costs, less accumulated amortization of $0 and $1,162 as of December 31, 2016 and 2015, respectively — 3,695 Total other assets held for sale, net $ — $ 10,777
Schedule of Disposal Groups, Including Discontinued Operations, Results Of Operations	Asset disposals previously classified as, and that continue to be reported as, discontinued operations for the year ended December 31, 2014 are as follows (in thousands): (Revised) Building Sold Location Date of Sale Gain/(Loss) on Sale Net Sales Proceeds 11107 and 11109 Sunset Hills Road Reston, Virginia March 19, 2014 $ (102 ) $ 22,326 1441 West Long Lake Road Troy, Michigan April 30, 2014 $ 182 $ 7,202 4685 Investment Drive Troy, Michigan April 30, 2014 $ 191 $ 11,198

Supplemental Disclosures of N45

Supplemental Disclosures of Noncash Activities (Tables)	12 Months Ended
	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Schedule of Cash Flow, Supplemental Disclosures	Certain noncash investing and financing activities for the years ended December 31, 2016 , 2015 , and 2014 (in thousands) are outlined below: 2016 2015 2014 Accrued capital expenditures and deferred lease costs $ 14,427 $ 20,630 $ 19,896 Accrued dividends and discount on dividend reinvestments $ 30,532 $ — $ — Escrowed cash from prior year applied to acquisitions in the current year $ — $ (5,050 ) $ — Change in accrued share repurchases as part of an announced plan $ — $ — $ (2,006 )

Income Taxes (Tables)

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Schedule of Tax Basis Income	Piedmont’s income tax basis net income for the years ended December 31, 2016 , 2015 , and 2014 , is calculated as follows (in thousands): (Restated) (Restated) (Revised) 2016 2015 2014 GAAP basis financial statement net income $ 99,732 $ 131,304 $ 42,150 Increase (decrease) in net income resulting from: Depreciation and amortization expense recognized for financial reporting purposes in excess of amounts recognized for income tax purposes 69,214 (1,717 ) 50,810 Rental income accrued for income tax purposes less than amounts for financial reporting purposes (18,964 ) (12,123 ) (28,504 ) Net amortization of above/below-market lease intangibles for income tax purposes in excess of amounts for financial reporting purposes (4,895 ) (4,614 ) (4,705 ) Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes (118,713 ) (43,493 ) (28,360 ) Taxable income/(loss) of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes (1,042 ) 2,491 (468 ) Other expenses, including impairment loss on real estate assets, for financial reporting purposes in excess of amounts for income tax purposes 42,019 54,425 5,727 Taxable income for Piedmont Office Holdings, Inc. in excess of amount for financial reporting purposes 648 — — Income tax basis net income, prior to dividends paid deduction $ 67,999 $ 126,273 $ 36,650
Schedule of Characterization Of Dividends To Common Stockholders	For income tax purposes, dividends to common stockholders are characterized as ordinary income, capital gains, or as a return of a stockholder’s invested capital. The composition of Piedmont’s distributions per common share is presented below: 2016 2015 2014 Ordinary income 81.77 % 31.75 % 29.32 % Return of capital 18.23 % — % 70.68 % Capital gains — % 68.25 % — % 100 % 100 % 100 %

Quarterly Results (unaudited) (

Quarterly Results (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Schedule of Quarterly Financial Information	A summary of the unaudited quarterly financial information for the years ended December 31, 2016 (restated), 2015 (restated), and 2014 (revised) is presented below (in thousands, except per-share data): 2016 Statement of Income Data: First Second Third Fourth Revenues $ 138,012 $ 135,307 $ 138,485 $ 143,911 Impairment loss on real estate assets $ — $ 10,950 $ 22,951 $ — Real estate operating income $ 26,372 $ 14,791 $ 2,988 $ 26,633 Income/(loss) from continuing operations $ 10,396 $ (1,553 ) $ (13,065 ) $ 10,529 Income/(loss) from discontinued operations $ — $ (1 ) $ 1 $ — Gain/(loss) on sale of real estate assets $ (20 ) $ 73,835 $ (57 ) $ 19,652 Net Income $ 10,376 $ 72,281 $ (13,121 ) $ 30,181 Net income/(loss) applicable to Piedmont $ 10,372 $ 72,278 $ (13,107 ) $ 30,189 Per-Share Data: Basic and diluted earnings/(loss) per share $ 0.07 $ 0.50 $ (0.09 ) $ 0.21 Dividends declared per share $ 0.21 $ 0.21 $ 0.21 $ 0.21 Balance Sheet Data: Goodwill $ 104,786 $ 99,278 $ 98,918 $ 98,918 Other assets held for sale, net $ 11,236 $ 8,761 $ — $ — Total assets $ 4,281,993 $ 4,217,680 $ 4,307,118 $ 4,368,168 Total debt, net (unsecured and secured debt) $ 2,002,918 $ 1,884,314 $ 1,994,078 $ 2,020,475 Cumulative distributions in excess of earnings $ (1,578,728 ) $ (1,536,948 ) $ (1,580,553 ) $ (1,580,863 ) Piedmont stockholders' equity $ 2,085,610 $ 2,124,870 $ 2,085,906 $ 2,095,821 Total stockholders' equity $ 2,086,639 $ 2,125,895 $ 2,087,804 $ 2,097,703 Total liabilities and stockholders' equity $ 4,281,993 $ 4,217,680 $ 4,307,118 $ 4,368,168 2015 Statement of Income Data: First Second Third Fourth Revenues $ 149,759 $ 146,734 $ 148,815 $ 139,461 Impairment loss on real estate assets $ — $ 6,196 $ 37,105 $ — Real estate operating income $ 28,214 $ 19,983 $ (3,424 ) $ 28,938 Income/(loss) from continuing operations $ 9,176 $ 2,531 $ (21,318 ) $ 11,164 Income/(loss) from discontinued operations $ — $ (3 ) $ 14 $ 72 Gain on sale of real estate assets $ 8,940 $ 21,520 $ 14,796 $ 84,427 Net income/(loss) $ 18,116 $ 24,048 $ (6,508 ) $ 95,663 Net income/(loss) applicable to Piedmont $ 18,112 $ 24,044 $ (6,512 ) $ 95,660 Per-Share Data: Basic and diluted earnings/(loss) per share $ 0.12 $ 0.15 $ (0.05 ) $ 0.65 Dividends declared per share $ 0.21 $ 0.21 $ 0.21 $ 0.21 Balance Sheet Data: Goodwill $ 145,340 $ 139,407 $ 134,770 $ 104,786 Other assets held for sale, net $ 9,703 $ 9,938 $ 10,038 $ 10,777 Total assets $ 4,780,000 $ 4,735,408 $ 4,689,613 $ 4,361,511 Total debt, net (unsecured and secured debt) $ 2,318,717 $ 2,312,804 $ 2,421,099 $ 2,029,510 Cumulative distributions in excess of earnings $ (1,411,258 ) $ (1,465,715 ) $ (1,613,418 ) $ (1,550,698 ) Piedmont stockholders' equity $ 2,252,423 $ 2,216,423 $ 2,048,669 $ 2,122,395 Total stockholders' equity $ 2,253,452 $ 2,217,448 $ 2,049,698 $ 2,123,420 Total liabilities and stockholders' equity $ 4,780,000 $ 4,735,408 $ 4,689,613 $ 4,361,511 2014 Statement of Income Data: First Second Third Fourth Revenues $ 136,320 $ 138,580 $ 144,641 $ 146,711 Real estate operating income $ 25,277 $ 26,556 $ 27,199 $ 28,789 Income from continuing operations $ 9,037 $ 9,325 $ 9,150 $ 12,567 Income/(loss) from discontinued operations $ 360 $ 882 $ 16 $ (42 ) Gain/(loss) on sale of real estate assets $ — $ 878 $ — $ (8 ) Net Income $ 9,397 $ 11,085 $ 9,166 $ 12,517 Net income applicable to Piedmont $ 9,393 $ 11,081 $ 9,162 $ 12,514 Per-Share Data: Basic and diluted earnings per share $ 0.06 $ 0.07 $ 0.06 $ 0.08 Dividends declared per share $ 0.20 $ 0.20 $ 0.20 $ 0.21

Guarantor and Non-Guarantor F48

Guarantor and Non-Guarantor Financial Information (Tables)	12 Months Ended
	Dec. 31, 2016
Guarantor and Non-Guarantor Financial Information [Abstract]
Condensed Balance Sheet	Condensed Consolidated Balance Sheets (As Restated, See Note 2) As of December 31, 2016 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Real estate assets, at cost: Land $ 46,133 $ — $ 623,715 $ — $ 669,848 Buildings and improvements, less accumulated depreciation 228,194 — 2,699,430 (300 ) 2,927,324 Intangible lease assets, less accumulated amortization 725 — 98,970 — 99,695 Construction in progress 145 — 34,680 — 34,825 Total real estate assets 275,197 — 3,456,795 (300 ) 3,731,692 Investments in and amounts due from unconsolidated joint ventures 7,360 — — — 7,360 Cash and cash equivalents 3,674 150 3,168 — 6,992 Tenant and straight-line receivables, net 20,159 — 172,183 — 192,342 Advances to affiliates 6,464,135 1,315,616 — (7,779,751 ) — Investment in subsidiary — 3,630,564 181 (3,630,745 ) — Notes receivable 88,910 — 95,790 (184,700 ) — Prepaid expenses, restricted cash, escrows, and other assets 6,189 — 20,575 (1,897 ) 24,867 Goodwill 98,918 — — — 98,918 Deferred lease costs, net 16,550 — 289,447 — 305,997 Total assets $ 6,981,092 $ 4,946,330 $ 4,038,139 $ (11,597,393 ) $ 4,368,168 Liabilities: Debt, net $ 1,701,933 $ — $ 503,242 $ (184,700 ) $ 2,020,475 Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures 17,365 31,230 118,712 (1,897 ) 165,410 Advances from affiliates 708,340 5,071,521 2,098,146 (7,878,007 ) — Deferred income 5,206 — 23,200 — 28,406 Intangible lease liabilities, net — — 48,005 — 48,005 Interest rate swaps 8,169 — — — 8,169 Total liabilities 2,441,013 5,102,751 2,791,305 (8,064,604 ) 2,270,465 Stockholders’ Equity: Common stock — 1,452 — — 1,452 Additional paid-in capital 3,626,564 3,676,000 1,309 (3,630,745 ) 3,673,128 Retained/(cumulative distributions in excess of) earnings 911,411 (3,833,873 ) 1,243,643 97,956 (1,580,863 ) Other comprehensive loss 2,104 — — — 2,104 Piedmont stockholders’ equity 4,540,079 (156,421 ) 1,244,952 (3,532,789 ) 2,095,821 Noncontrolling interest — — 1,882 — 1,882 Total stockholders’ equity 4,540,079 (156,421 ) 1,246,834 (3,532,789 ) 2,097,703 Total liabilities and stockholders’ equity $ 6,981,092 $ 4,946,330 $ 4,038,139 $ (11,597,393 ) $ 4,368,168 Condensed Consolidated Balance Sheets (As Restated, See Note 2) As of December 31, 2015 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Assets: Real estate assets, at cost: Land $ 54,459 $ — $ 621,632 $ — $ 676,091 Buildings and improvements, less accumulated depreciation 270,057 — 2,567,706 (300 ) 2,837,463 Intangible lease assets, less accumulated amortization 1,268 — 83,395 — 84,663 Construction in progress 240 — 20,735 — 20,975 Real estate assets held for sale, net 76,614 — — — 76,614 Total real estate assets 402,638 — 3,293,468 (300 ) 3,695,806 Investments in and amounts due from unconsolidated joint ventures 7,577 — — — 7,577 Cash and cash equivalents 2,174 150 3,117 — 5,441 Tenant and straight-line rent receivables, net 23,738 — 149,994 — 173,732 Advances to affiliates 6,127,343 1,251,530 — (7,378,873 ) — Investment in subsidiary — 3,752,523 186 (3,752,709 ) — Notes receivable 134,750 — 23,890 (113,240 ) 45,400 Prepaid expenses, restricted cash, escrows, and other assets 7,091 — 24,118 (1,258 ) 29,951 Goodwill 104,786 — — — 104,786 Deferred lease costs, net 20,939 — 267,102 — 288,041 Other assets held for sale, net 10,777 — — — 10,777 Total assets $ 6,841,813 $ 5,004,203 $ 3,761,875 $ (11,246,380 ) $ 4,361,511 Liabilities: Debt, net $ 1,552,007 $ — $ 590,743 $ (113,240 ) $ 2,029,510 Accounts payable, accrued expenses, and accrued capital expenditures 18,954 580 110,189 (1,258 ) 128,465 Advances from affiliates 580,526 5,033,266 1,842,577 (7,456,369 ) — Deferred income 5,905 — 21,365 — 27,270 Intangible lease liabilities, net — — 42,853 — 42,853 Interest rate swaps 9,993 — — — 9,993 Total liabilities 2,167,385 5,033,846 2,607,727 (7,570,867 ) 2,238,091 Stockholders’ Equity: Common stock — 1,455 — — 1,455 Additional paid-in capital 3,748,524 3,672,849 1,314 (3,752,710 ) 3,669,977 Retained/(cumulative distributions in excess of) earnings 924,243 (3,703,947 ) 1,151,809 77,197 (1,550,698 ) Other comprehensive loss 1,661 — — — 1,661 Piedmont stockholders’ equity 4,674,428 (29,643 ) 1,153,123 (3,675,513 ) 2,122,395 Noncontrolling interest — — 1,025 — 1,025 Total stockholders’ equity 4,674,428 (29,643 ) 1,154,148 (3,675,513 ) 2,123,420 Total liabilities and stockholders’ equity $ 6,841,813 $ 5,004,203 $ 3,761,875 $ (11,246,380 ) $ 4,361,511
Condensed Income Statement	Condensed Consolidated Statements of Income (As Restated, See Note 2) For the year ended December 31, 2016 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Revenues: Rental income $ 55,007 $ — $ 407,514 $ (2,631 ) $ 459,890 Tenant reimbursements 14,081 — 80,378 (498 ) 93,961 Property management fee revenue — — 16,897 (15,033 ) 1,864 69,088 — 504,789 (18,162 ) 555,715 Expenses: Property operating costs 31,967 — 205,344 (18,377 ) 218,934 Depreciation 16,657 — 111,076 — 127,733 Amortization 3,715 — 71,404 — 75,119 Impairment loss on real estate assets 8,259 — 25,642 — 33,901 General and administrative 28,314 311 36,065 (35,446 ) 29,244 88,912 311 449,531 (53,823 ) 484,931 Real estate operating income/(loss) (19,824 ) (311 ) 55,258 35,661 70,784 Other income (expense): Interest expense (49,108 ) — (27,636 ) 11,884 (64,860 ) Other income/(expense) 9,560 282 2,029 (11,884 ) (13 ) Net recoveries from casualty events and litigation settlements — — 34 — 34 Equity in income of unconsolidated joint ventures 362 — — — 362 (39,186 ) 282 (25,573 ) — (64,477 ) Income/(loss) from continuing operations (59,010 ) (29 ) 29,685 35,661 6,307 Gain on sale of real estate assets 31,275 — 62,135 — 93,410 Net income/(loss) (27,735 ) (29 ) 91,820 35,661 99,717 Less: Net loss applicable to noncontrolling interest — — 15 — 15 Net income/(loss) applicable to Piedmont $ (27,735 ) $ (29 ) $ 91,835 $ 35,661 $ 99,732 Condensed Consolidated Statements of Income (As Restated, See Note 2) For the year ended December 31, 2015 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Revenues: Rental income $ 67,317 $ — $ 404,460 $ (2,905 ) $ 468,872 Tenant reimbursements 13,340 — 100,955 (414 ) 113,881 Property management fee revenue — — 17,801 (15,785 ) 2,016 80,657 — 523,216 (19,104 ) 584,769 Expenses: Property operating costs 36,380 — 225,428 (19,786 ) 242,022 Depreciation 20,891 — 113,612 — 134,503 Amortization 4,598 — 56,288 — 60,886 Impairment loss on real estate assets 6,195 — 37,106 — 43,301 General and administrative 29,645 341 35,923 (35,563 ) 30,346 97,709 341 468,357 (55,349 ) 511,058 Real estate operating income/(loss) (17,052 ) (341 ) 54,859 36,245 73,711 Other income (expense): Interest expense (51,704 ) — (33,540 ) 11,246 (73,998 ) Other income/(expense) 12,600 — 211 (11,246 ) 1,565 Net recoveries/(loss) from casualty events and litigation settlements 23 — (301 ) — (278 ) Equity in income of unconsolidated joint ventures 553 — — — 553 (38,528 ) — (33,630 ) — (72,158 ) Income/(loss) from continuing operations (55,580 ) (341 ) 21,229 36,245 1,553 Discontinued operations: Operating income 15 — 69 — 84 Loss on sale of real estate assets (1 ) — — — (1 ) Income from discontinued operations 14 — 69 — 83 Gain on sale of real estate assets 45,225 — 84,458 — 129,683 Net income/(loss) (10,341 ) (341 ) 105,756 36,245 131,319 Less: Net income applicable to noncontrolling interest — — (15 ) — (15 ) Net income/(loss) applicable to Piedmont $ (10,341 ) $ (341 ) $ 105,741 $ 36,245 $ 131,304 Condensed Consolidated Statements of Income (As Revised, See Note 2) For the year ended December 31, 2014 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Revenues: Rental income $ 72,843 $ — $ 386,995 $ (5,203 ) $ 454,635 Tenant reimbursements 16,566 — 93,516 (534 ) 109,548 Property management fee revenue — — 16,516 (14,447 ) 2,069 89,409 — 497,027 (20,184 ) 566,252 Expenses: Property operating costs 42,621 — 217,786 (20,976 ) 239,431 Depreciation 23,512 — 115,084 — 138,596 Amortization 4,754 — 51,825 — 56,579 General and administrative 23,235 300 28,232 (27,942 ) 23,825 94,122 300 412,927 (48,918 ) 458,431 Real estate operating income/(loss) (4,713 ) (300 ) 84,100 28,734 107,821 Other income (expense): Interest expense (47,355 ) — (39,625 ) 12,534 (74,446 ) Other income/(expense) 11,944 — 652 (12,534 ) 62 Net recoveries from casualty events and litigation settlements 1,322 1,479 4,191 — 6,992 Equity in loss of unconsolidated joint ventures (350 ) — — — (350 ) (34,439 ) 1,479 (34,782 ) — (67,742 ) Income/(loss) from continuing operations (39,152 ) 1,179 49,318 28,734 40,079 Discontinued operations: Operating income 913 — 41 — 954 Gain on sale of real estate assets 70 — 192 — 262 Income from discontinued operations 983 — 233 — 1,216 Gain on sale of real estate assets — — 870 — 870 Net income/(loss) (38,169 ) 1,179 50,421 28,734 42,165 Less: Net income applicable to noncontrolling interest — — (15 ) — (15 ) Net income/(loss) applicable to Piedmont $ (38,169 ) $ 1,179 $ 50,406 $ 28,734 $ 42,150
Condensed Cash Flow Statement	Condensed Consolidated Statements of Cash Flows (As Restated, See Note 2) For the year ended December 31, 2016 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Net Cash Provided By/(Used In) Operating Activities $ (26,260 ) $ 5,214 $ 221,195 $ 35,660 $ 235,809 Cash Flows from Investing Activities: Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals (5,060 ) — (454,836 ) — (459,896 ) Intercompany note receivable 440 — (71,900 ) 71,460 — Net sales proceeds from wholly-owned properties 200,220 — 165,698 — 365,918 Deferred lease costs paid (2,758 ) — (23,138 ) — (25,896 ) Net cash provided by/(used in) investing activities 192,842 — (384,176 ) 71,460 (119,874 ) Cash Flows from Financing Activities: Debt issuance costs paid (264 ) — — — (264 ) Proceeds from debt 695,000 — — — 695,000 Repayments of debt (538,000 ) — (168,875 ) — (706,875 ) Intercompany note payable (9,600 ) — 81,060 (71,460 ) — Costs of issuance of common stock — (342 ) — — (342 ) Shares withheld to pay tax obligations related to employee stock compensation — (2,344 ) — — (2,344 ) Repurchases of common stock as part of announced plan — (7,943 ) — — (7,943 ) (Distributions to)/repayments from affiliates (312,218 ) 97,016 250,862 (35,660 ) — Dividends paid and discount on dividend reinvestments — (91,601 ) (15 ) — (91,616 ) Net cash provided by/(used in) financing activities (165,082 ) (5,214 ) 163,032 (107,120 ) (114,384 ) Net increase in cash and cash equivalents 1,500 — 51 — 1,551 Cash and cash equivalents, beginning of year 2,174 150 3,117 — 5,441 Cash and cash equivalents, end of year $ 3,674 $ 150 $ 3,168 $ — $ 6,992 Condensed Consolidated Statements of Cash Flows (As Restated, See Note 2) For the year ended December 31, 2015 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Net Cash Provided By/(Used In) Operating Activities $ (27,077 ) $ 4,699 $ 205,177 $ 36,245 $ 219,044 Cash Flows from Investing Activities: Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals (12,203 ) — (489,241 ) — (501,444 ) Intercompany note receivable 72,000 — — (72,000 ) — Redemption of noncontrolling interest in unconsolidated variable interest entity — — (4,000 ) — (4,000 ) Net sales proceeds from wholly-owned properties 151,557 — 696,612 — 848,169 Deferred lease costs paid (3,792 ) — (33,891 ) — (37,683 ) Net cash provided by/(used in) investing activities 207,562 — 169,480 (72,000 ) 305,042 Cash Flows from Financing Activities: Debt issuance costs paid (575 ) — (506 ) — (1,081 ) Proceeds from debt 1,142,577 — 159,281 — 1,301,858 Repayments of debt (1,438,000 ) — (106,301 ) — (1,544,301 ) Intercompany note payable — — (72,000 ) 72,000 — Costs of issuance of common stock — (326 ) — — (326 ) Shares withheld to pay tax obligations related to employee stock compensation — (1,710 ) — — (1,710 ) Repurchases of common stock as part of announced plan — (158,860 ) — — (158,860 ) (Distributions to)/repayments from affiliates 109,544 281,073 (354,372 ) (36,245 ) — Dividends paid and discount on dividend reinvestments — (126,516 ) (15 ) — (126,531 ) Net cash provided by/(used in) financing activities (186,454 ) (6,339 ) (373,913 ) 35,755 (530,951 ) Net increase/(decrease) in cash and cash equivalents (5,969 ) (1,640 ) 744 — (6,865 ) Cash and cash equivalents, beginning of year 8,143 1,790 2,373 — 12,306 Cash and cash equivalents, end of year $ 2,174 $ 150 $ 3,117 $ — $ 5,441 Condensed Consolidated Statements of Cash Flows (As Revised, See Note 2) For the year ended December 31, 2014 (in thousands) Issuer Guarantor Non-Guarantor Subsidiaries Eliminations Consolidated Net Cash Provided by Operating Activities $ 5,448 $ 4,088 $ 178,889 $ 28,733 $ 217,158 Cash Flows from Investing Activities: Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals (23,541 ) — (267,918 ) — (291,459 ) Intercompany note receivable 650 — — (650 ) — Net sales proceeds from wholly-owned properties 29,519 — 16,713 — 46,232 Net sales proceeds received from unconsolidated joint ventures 6,017 — — — 6,017 Investments in unconsolidated joint ventures (42 ) — — — (42 ) Deferred lease costs paid (4,472 ) — (23,222 ) — (27,694 ) Net cash provided by/(used in) investing activities 8,131 — (274,427 ) (650 ) (266,946 ) Cash Flows from Financing Activities: Debt issuance costs paid (1,294 ) — — — (1,294 ) Proceeds from debt 1,052,527 — — — 1,052,527 Repayments of debt (238,000 ) — (575,702 ) — (813,702 ) Discount due to loan modification (1,135 ) — — — (1,135 ) Intercompany note payable — — (650 ) 650 — Shares withheld to pay tax obligations related to employee stock compensation — (1,275 ) — (1,275 ) Repurchases of common stock as part of announced plan — (54,802 ) — — (54,802 ) (Distributions to)/repayments from affiliates (820,795 ) 178,812 670,716 (28,733 ) — Dividends paid and discount on dividend reinvestments — (125,183 ) (15 ) — (125,198 ) Net cash provided by/(used in) financing activities (8,697 ) (2,448 ) 94,349 (28,083 ) 55,121 Net increase/(decrease) in cash and cash equivalents 4,882 1,640 (1,189 ) — 5,333 Cash and cash equivalents, beginning of year 3,261 150 3,562 — 6,973 Cash and cash equivalents, end of year $ 8,143 $ 1,790 $ 2,373 $ — $ 12,306

Organization (Details)

Organization (Details) ft² in Millions	12 Months Ended
	Dec. 31, 2016ft²segmentpropertysubsidiarymarket
Real Estate Properties [Line Items]
Number of wholly owned subsidiaries | subsidiary	2
Percentage ownership by sole general partner	99.90%
Percentage ownership by sole limited partner	0.10%
Rentable square feet | ft²	19.6
Percentage of annualized lease revenue	87.00%
Number of operating segments | segment	1
US [Member]
Real Estate Properties [Line Items]
Number of office markets | market	8
Unconsolidated Joint Venture [Member]
Real Estate Properties [Line Items]
Number of real estate properties	1
In-Service Office Properties [Member]
Real Estate Properties [Line Items]
Number of real estate properties	65
Rentable square feet | ft²	18.9
Percentage of Class A commercial office space	94.20%
Redevelopment Asset [Member]
Real Estate Properties [Line Items]
Number of real estate properties	1
Development Assets [Member]
Real Estate Properties [Line Items]
Number of office properties under development	2

Restatement (Narrative) (Detail

Restatement (Narrative) (Details) $ in Thousands	1 Months Ended	3 Months Ended												12 Months Ended
	Apr. 30, 2007property_management_company	Dec. 31, 2016USD ($)	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Sep. 30, 2015USD ($)	Jun. 30, 2015USD ($)	Mar. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Sep. 30, 2014USD ($)	Jun. 30, 2014USD ($)	Mar. 31, 2014USD ($)	Dec. 31, 2016USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2013USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Number of property management companies purchased | property_management_company	2
Reduction to gain on sale of real estate assets		$ (19,652)	$ 57	$ (73,835)	$ 20	$ (84,427)	$ (14,796)	$ (21,520)	$ (8,940)	$ 8	$ 0	$ (878)	$ 0	$ (93,410)	$ (129,683)	$ (870)
Disposals prior to 2014 recorded as an adjustment to cumulative distributions in excess of earnings																	$ 30,140
Other assets held for sale, net		0	$ 0	$ 8,761	$ 11,236	10,777	$ 10,038	$ 9,938	$ 9,703					0	10,777
Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reduction to gain on sale of real estate assets														5,152	38,554	262
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Disposals prior to 2014 recorded as an adjustment to cumulative distributions in excess of earnings																	$ 30,100
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member] | Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Reduction to gain on sale of real estate assets																$ 1,200
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other assets held for sale, net		$ 0				10,777								$ 0	10,777
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Restatement Adjustment [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other assets held for sale, net						$ 2,300									$ 2,300

Restatement (Schedule of Previo

Restatement (Schedule of Previously Reported, Restatement Adjustments, and Restated Consolidated Balance Sheets) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Land	$ 669,848				$ 676,091
Buildings and improvements, less accumulated depreciation	2,927,324				2,837,463
Intangible lease assets, less accumulated amortization	99,695				84,663
Construction in progress	34,825				20,975
Real estate assets held for sale, net	0				76,614
Total real estate assets	3,731,692				3,695,806
Investments in and amounts due from unconsolidated joint ventures	7,360				7,577
Cash and cash equivalents	6,992				5,441				$ 12,306	$ 6,973
Tenant receivables, net of allowance for doubtful accounts	26,494				26,339
Straight-line rent receivables	165,848				147,393
Notes receivable	0				45,400
Restricted cash and escrows	1,212				5,174
Prepaid expenses and other assets	23,655				24,777
Goodwill	98,918	$ 98,918	$ 99,278	$ 104,786	104,786	$ 134,770	$ 139,407	$ 145,340
Deferred lease costs, net	305,997				288,041
Other assets held for sale, net	0	0	8,761	11,236	10,777	10,038	9,938	9,703
Total assets	4,368,168	4,307,118	4,217,680	4,281,993	4,361,511	4,689,613	4,735,408	4,780,000
Liabilities:
Unsecured debt, net of discount and unamortized debt issuance costs	1,687,731				1,528,221
Secured debt, net of premiums and unamortized debt issuance costs	332,744				501,289
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	165,410				128,465
Deferred income	28,406				27,270
Intangible lease liabilities, net	48,005				42,853
Interest rate swaps	8,169				9,993
Liabilities	2,270,465				2,238,091
Commitments and Contingencies	0				0
Stockholders' Equity:
Shares-in-trust	0				0
Preferred stock	0				0
Common stock	1,452				1,455
Additional paid-in capital	3,673,128				3,669,977
Retained/(cumulative distributions in excess of) earnings	(1,580,863)	(1,580,553)	(1,536,948)	(1,578,728)	(1,550,698)	(1,613,418)	(1,465,715)	(1,411,258)
Other comprehensive income	2,104				1,661
Piedmont stockholders’ equity	2,095,821	2,085,906	2,124,870	2,085,610	2,122,395	2,048,669	2,216,423	2,252,423
Noncontrolling interest	1,882				1,025
Total stockholders’ equity	2,097,703	2,087,804	2,125,895	2,086,639	2,123,420	2,049,698	2,217,448	2,253,452	2,280,677	2,431,019
Total liabilities and stockholders’ equity	4,368,168	$ 4,307,118	$ 4,217,680	$ 4,281,993	4,361,511	$ 4,689,613	$ 4,735,408	$ 4,780,000
Scenario, Previously Reported [Member]
Assets:
Land	669,848				676,091
Buildings and improvements, less accumulated depreciation	2,927,324				2,837,463
Intangible lease assets, less accumulated amortization	99,695				84,663
Construction in progress	34,825				20,975
Real estate assets held for sale, net	0				76,614
Total real estate assets	3,731,692				3,695,806
Investments in and amounts due from unconsolidated joint ventures	7,360				7,577
Cash and cash equivalents	6,992				5,441				$ 12,306	6,973
Tenant receivables, net of allowance for doubtful accounts	26,494				26,339
Straight-line rent receivables	165,848				147,393
Notes receivable	0				45,400
Restricted cash and escrows	1,212				5,174
Prepaid expenses and other assets	23,655				24,777
Goodwill	180,097				180,097
Deferred lease costs, net	305,997				288,041
Other assets held for sale, net	0				8,490
Total assets	4,449,347				4,434,535
Liabilities:
Unsecured debt, net of discount and unamortized debt issuance costs	1,687,731				1,528,221
Secured debt, net of premiums and unamortized debt issuance costs	332,744				501,289
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	165,410				128,465
Deferred income	28,406				27,270
Intangible lease liabilities, net	48,005				42,853
Interest rate swaps	8,169				9,993
Liabilities	2,270,465				2,238,091
Commitments and Contingencies	0				0
Stockholders' Equity:
Shares-in-trust	0				0
Preferred stock	0				0
Common stock	1,452				1,455
Additional paid-in capital	3,673,128				3,669,977
Retained/(cumulative distributions in excess of) earnings	(1,499,684)				(1,477,674)
Other comprehensive income	2,104				1,661
Piedmont stockholders’ equity	2,177,000				2,195,419
Noncontrolling interest	1,882				1,025
Total stockholders’ equity	2,178,882				2,196,444					$ 2,461,159
Total liabilities and stockholders’ equity	4,449,347				4,434,535
Scenario, Adjustment [Member]
Assets:
Land	0				0
Buildings and improvements, less accumulated depreciation	0				0
Intangible lease assets, less accumulated amortization	0				0
Construction in progress	0				0
Real estate assets held for sale, net	0				0
Investments in and amounts due from unconsolidated joint ventures	0				0
Cash and cash equivalents	0				0
Tenant receivables, net of allowance for doubtful accounts	0				0
Straight-line rent receivables	0				0
Notes receivable	0				0
Restricted cash and escrows	0				0
Prepaid expenses and other assets	0				0
Goodwill	(81,179)				(75,311)
Deferred lease costs, net	0				0
Other assets held for sale, net	0				2,287
Total assets	(81,179)				(73,024)
Liabilities:
Unsecured debt, net of discount and unamortized debt issuance costs	0				0
Secured debt, net of premiums and unamortized debt issuance costs	0				0
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	0				0
Deferred income	0				0
Intangible lease liabilities, net	0				0
Interest rate swaps	0				0
Liabilities	0
Commitments and Contingencies	0				0
Stockholders' Equity:
Shares-in-trust	0				0
Preferred stock	0				0
Common stock	0				0
Additional paid-in capital	0				0
Retained/(cumulative distributions in excess of) earnings	(81,179)				(73,024)
Other comprehensive income	0				0
Piedmont stockholders’ equity	(81,179)				(73,024)
Noncontrolling interest	0				0
Total stockholders’ equity	(81,179)				(73,024)
Total liabilities and stockholders’ equity	$ (81,179)				$ (73,024)

Restatement (Schedule of Prev52

Restatement (Schedule of Previously Reported, Restatement Adjustments, and Restated Consolidated Statements of Operations) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Revenues:
Rental income													$ 459,890		$ 468,872		$ 454,635
Tenant reimbursements													93,961		113,881		109,548
Property management fee revenue													1,864		2,016		2,069
Total revenues	$ 143,911	$ 138,485	$ 135,307	$ 138,012	$ 139,461	$ 148,815	$ 146,734	$ 149,759	$ 146,711	$ 144,641	$ 138,580	$ 136,320	555,715		584,769		566,252
Expenses:
Property operating costs													218,934		242,022		239,431
Depreciation													127,733		134,503		138,596
Amortization													75,119		60,886		56,579
Impairment loss on real estate assets	0	22,951	10,950	0	0	37,105	6,196	0					33,901	[1]	43,301	[1]	0	[1]
General and administrative													29,244		30,346		23,825
Operating Expenses													484,931		511,058		458,431
Real estate operating income	26,633	2,988	14,791	26,372	28,938	(3,424)	19,983	28,214	28,789	27,199	26,556	25,277	70,784		73,711		107,821
Other income (expense):
Interest expense													(64,860)		(73,998)		(74,446)
Other income/(expense)													(13)		1,565		62
Net recoveries/(loss) from casualty events and litigation settlements													34		(278)		6,992
Equity in income/(loss) of unconsolidated joint ventures													362		553		(350)
Nonoperating Income (Expense)													(64,477)		(72,158)		(67,742)
Income from continuing operations	10,529	(13,065)	(1,553)	10,396	11,164	(21,318)	2,531	9,176	12,567	9,150	9,325	9,037	6,307		1,553		40,079
Discontinued operations:
Operating income													0		84		954
Gain/(loss) on sale of real estate assets													0		(1)		262
Income from discontinued operations	0	1	(1)	0	72	14	(3)	0	(42)	16	882	360	0		83		1,216
Gain/(loss) on sale of real estate assets	19,652	(57)	73,835	(20)	84,427	14,796	21,520	8,940	(8)	0	878	0	93,410		129,683		870
Net income	30,181	(13,121)	72,281	10,376	95,663	(6,508)	24,048	18,116	12,517	9,166	11,085	9,397	99,717		131,319		42,165
Less: Net loss/(income) applicable to noncontrolling interest													15		(15)		(15)
Net income applicable to Piedmont	$ 30,189	$ (13,107)	$ 72,278	$ 10,372	$ 95,660	$ (6,512)	$ 24,044	$ 18,112	$ 12,514	$ 9,162	$ 11,081	$ 9,393	$ 99,732		$ 131,304		$ 42,150
Per share information— basic and diluted:
Income from continuing operations and gain on sale of real estate assets (in dollars per share)													$ 0.69		$ 0.87		$ 0.26
Income from discontinued operations (in dollars per share)													0		0		0.01
Net income available to common stockholders (in dollars per share)	$ 0.21	$ (0.09)	$ 0.50	$ 0.07	$ 0.65	$ (0.05)	$ 0.15	$ 0.12	$ 0.08	$ 0.06	$ 0.07	$ 0.06	$ 0.69		$ 0.87		$ 0.27
Weighted-average shares outstanding - basic (in shares)													145,230,382		150,537,757		154,452,121
Weighted-average shares outstanding - diluted (in shares)													145,634,953		150,880,116		154,585,273
Scenario, Previously Reported [Member]
Revenues:
Rental income													$ 459,890		$ 468,872		$ 454,635
Tenant reimbursements													93,961		113,881		109,548
Property management fee revenue													1,864		2,016		2,069
Total revenues													555,715		584,769		566,252
Expenses:
Property operating costs													218,934		242,022		239,431
Depreciation													127,733		134,503		138,596
Amortization													75,119		60,886		56,579
Impairment loss on real estate assets													30,898		40,169		0
General and administrative													29,244		30,346		23,825
Operating Expenses													481,928		507,926		458,431
Real estate operating income													73,787		76,843		107,821
Other income (expense):
Interest expense													(64,860)		(73,998)		(74,446)
Other income/(expense)													(13)		1,565		62
Net recoveries/(loss) from casualty events and litigation settlements													34		(278)		6,992
Equity in income/(loss) of unconsolidated joint ventures													362		553		(350)
Nonoperating Income (Expense)													(64,477)		(72,158)		(67,742)
Income from continuing operations													9,310		4,685		40,079
Discontinued operations:
Operating income													0		84		954
Gain/(loss) on sale of real estate assets													0		(1)		1,198
Income from discontinued operations													0		83		2,152
Gain/(loss) on sale of real estate assets													98,562		168,237		1,132
Net income													107,872		173,005		43,363
Less: Net loss/(income) applicable to noncontrolling interest													15		(15)		(15)
Net income applicable to Piedmont													$ 107,887		$ 172,990		$ 43,348
Per share information— basic and diluted:
Income from continuing operations and gain on sale of real estate assets (in dollars per share)													$ 0.74		$ 1.15		$ 0.27
Income from discontinued operations (in dollars per share)													0		0		0.01
Net income available to common stockholders (in dollars per share)													$ 0.74		$ 1.15		$ 0.28
Weighted-average shares outstanding - basic (in shares)													145,230,382		150,537,757		154,452,121
Weighted-average shares outstanding - diluted (in shares)													145,634,953		150,880,116		154,585,273
Restatement Adjustment [Member]
Revenues:
Rental income													$ 0		$ 0		$ 0
Tenant reimbursements													0		0		0
Property management fee revenue													0		0		0
Total revenues													0		0		0
Expenses:
Property operating costs													0		0		0
Depreciation													0		0		0
Amortization													0		0		0
Impairment loss on real estate assets													3,003		3,132		0
General and administrative													0		0		0
Operating Expenses													3,003		3,132		0
Real estate operating income													(3,003)		(3,132)		0
Other income (expense):
Interest expense													0		0		0
Other income/(expense)													0		0		0
Net recoveries/(loss) from casualty events and litigation settlements													0		0		0
Equity in income/(loss) of unconsolidated joint ventures													0		0		0
Nonoperating Income (Expense)													0		0		0
Income from continuing operations													(3,003)		(3,132)		0
Discontinued operations:
Operating income													0		0		0
Gain/(loss) on sale of real estate assets													0		0		(936)
Income from discontinued operations													0		0		(936)
Gain/(loss) on sale of real estate assets													(5,152)		(38,554)		(262)
Net income													(8,155)		(41,686)		(1,198)
Less: Net loss/(income) applicable to noncontrolling interest													0		0		0
Net income applicable to Piedmont													$ (8,155)		$ (41,686)		$ (1,198)
Per share information— basic and diluted:
Income from continuing operations and gain on sale of real estate assets (in dollars per share)													$ (0.05)		$ (0.28)		$ (0.01)
Income from discontinued operations (in dollars per share)													0		0		0
Net income available to common stockholders (in dollars per share)													$ (0.05)		$ (0.28)		$ (0.01)
Weighted-average shares outstanding - basic (in shares)
Weighted-average shares outstanding - diluted (in shares)
[1]	The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

Restatement (Schedule of Prev53

Restatement (Schedule of Previously Reported, Restatement Adjustments, and Restated Consolidated Statements of Cash Flows) (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Cash Flows from Operating Activities:
Net income	$ 30,181	$ (13,121)	$ 72,281	$ 10,376	$ 95,663	$ (6,508)	$ 24,048	$ 18,116	$ 12,517	$ 9,166	$ 11,085	$ 9,397	$ 99,717		$ 131,319		$ 42,165
Operating distributions received from unconsolidated joint ventures													579		774		266
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation													127,733		134,503		138,679
Amortization of debt issuance costs													1,702		1,768		1,578
Gain/(loss) on settlement of forward starting interest rate swaps													0		(1,284)		14,960
Other amortization													74,373		61,221		56,327
Impairment loss on real estate assets	0	$ 22,951	$ 10,950	0	0	$ 37,105	$ 6,196	0					33,901	[1]	43,301	[1]	0	[1]
Stock compensation expense													7,928		8,789		5,250
Equity in loss/(income) of unconsolidated joint ventures													(362)		(553)		350
Gain on sale of real estate assets, net													(93,410)		(129,683)		(1,132)
Retirement of shares returned from escrow													0		0		(1,479)
Changes in assets and liabilities:
Increase in tenant and straight-line rent receivables, net													(26,747)		(29,478)		(40,505)
Decrease/(increase) in restricted cash and escrows													3,229		(5,256)		(135)
Decrease/(increase) in prepaid expenses and other assets													1,996		(828)		(1,884)
Increase/(decrease) in accounts payable and accrued expenses													3,729		(162)		2,995
Increase/(decrease) in deferred income													1,441		4,613		(277)
Net cash provided by operating activities													235,809		219,044		217,158
Cash Flows from Investing Activities:
Acquisition of real estate assets, net of related debt assumed, and intangibles													(349,668)		(382,773)		(117,418)
Net cash held in escrow for acquisitions													0		0		(5,150)
Capitalized expenditures, net of accruals													(110,228)		(118,671)		(168,891)
Redemption of noncontrolling interest in unconsolidated variable interest entity													0		(4,000)		0
Net sale proceeds from wholly-owned properties													365,918		848,169		46,232
Net sale proceeds received from unconsolidated joint ventures													0		0		6,017
Investments in unconsolidated joint ventures													0		0		(42)
Deferred lease costs paid													(25,896)		(37,683)		(27,694)
Net cash provided by/(used in) investing activities													(119,874)		305,042		(266,946)
Cash Flows from Financing Activities:
Debt issuance costs paid													(264)		(1,081)		(1,294)
Proceeds from debt													695,000		1,301,858		1,052,527
Repayments of debt													(706,875)		(1,544,301)		(813,702)
Discount paid due to loan modification													0		0		(1,135)
Costs of issuance of common stock													(342)		(326)		0
Shares withheld to pay tax obligations related to employee stock compensation													(2,344)		(1,710)		(1,275)
Repurchases of common stock as part of announced plan													(7,943)		(158,860)		(54,802)
Dividends paid and discount on dividend reinvestments													(91,616)		(126,531)		(125,198)
Net cash provided by/(used in) financing activities													(114,384)		(530,951)		55,121
Net increase/(decrease) in cash and cash equivalents													1,551		(6,865)		5,333
Cash and cash equivalents, beginning of year				5,441				12,306				6,973	5,441		12,306		6,973
Cash and cash equivalents, end of year	6,992				5,441				12,306				6,992		5,441		12,306
Scenario, Previously Reported [Member]
Cash Flows from Operating Activities:
Net income													107,872		173,005		43,363
Operating distributions received from unconsolidated joint ventures													579		774		266
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation													127,733		134,503		138,679
Amortization of debt issuance costs													1,702		1,768		1,578
Gain/(loss) on settlement of forward starting interest rate swaps															(1,284)		14,960
Other amortization													74,373		61,221		56,327
Impairment loss on real estate assets													30,898		40,169		0
Stock compensation expense													7,928		8,789		5,250
Equity in loss/(income) of unconsolidated joint ventures													(362)		(553)		350
Gain on sale of real estate assets, net													(98,562)		(168,237)		(2,330)
Retirement of shares returned from escrow																	(1,479)
Changes in assets and liabilities:
Increase in tenant and straight-line rent receivables, net													(26,747)		(29,478)		(40,505)
Decrease/(increase) in restricted cash and escrows													3,229		(5,256)		(135)
Decrease/(increase) in prepaid expenses and other assets													1,996		(828)		(1,884)
Increase/(decrease) in accounts payable and accrued expenses													3,729		(162)		2,995
Increase/(decrease) in deferred income													1,441		4,613		(277)
Net cash provided by operating activities													235,809		219,044		217,158
Cash Flows from Investing Activities:
Acquisition of real estate assets, net of related debt assumed, and intangibles													(349,668)		(382,773)		(117,418)
Net cash held in escrow for acquisitions																	(5,150)
Capitalized expenditures, net of accruals													(110,228)		(118,671)		(168,891)
Redemption of noncontrolling interest in unconsolidated variable interest entity															(4,000)
Net sale proceeds from wholly-owned properties													365,918		848,169		46,232
Net sale proceeds received from unconsolidated joint ventures																	6,017
Investments in unconsolidated joint ventures																	(42)
Deferred lease costs paid													(25,896)		(37,683)		(27,694)
Net cash provided by/(used in) investing activities													(119,874)		305,042		(266,946)
Cash Flows from Financing Activities:
Debt issuance costs paid													(264)		(1,081)		(1,294)
Proceeds from debt													695,000		1,301,858		1,052,527
Repayments of debt													(706,875)		(1,544,301)		(813,702)
Discount paid due to loan modification																	(1,135)
Costs of issuance of common stock													(342)		(326)
Shares withheld to pay tax obligations related to employee stock compensation													(2,344)		(1,710)		(1,275)
Repurchases of common stock as part of announced plan													(7,943)		(158,860)		(54,802)
Dividends paid and discount on dividend reinvestments													(91,616)		(126,531)		(125,198)
Net cash provided by/(used in) financing activities													(114,384)		(530,951)		55,121
Net increase/(decrease) in cash and cash equivalents													1,551		(6,865)		5,333
Cash and cash equivalents, beginning of year				5,441				12,306				6,973	5,441		12,306		6,973
Cash and cash equivalents, end of year	6,992				5,441				12,306				6,992		5,441		12,306
Restatement Adjustment [Member]
Cash Flows from Operating Activities:
Net income													(8,155)		(41,686)		(1,198)
Operating distributions received from unconsolidated joint ventures													0		0		0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation													0		0		0
Amortization of debt issuance costs													0		0		0
Gain/(loss) on settlement of forward starting interest rate swaps															0		0
Other amortization													0		0		0
Impairment loss on real estate assets													3,003		3,132		0
Stock compensation expense													0		0		0
Equity in loss/(income) of unconsolidated joint ventures													0		0		0
Gain on sale of real estate assets, net													5,152		38,554		1,198
Retirement of shares returned from escrow																	0
Changes in assets and liabilities:
Increase in tenant and straight-line rent receivables, net													0		0		0
Decrease/(increase) in restricted cash and escrows													0		0		0
Decrease/(increase) in prepaid expenses and other assets													0		0		0
Increase/(decrease) in accounts payable and accrued expenses													0		0		0
Increase/(decrease) in deferred income													0		0		0
Net cash provided by operating activities													0		0		0
Cash Flows from Investing Activities:
Acquisition of real estate assets, net of related debt assumed, and intangibles													0		0		0
Net cash held in escrow for acquisitions																	0
Capitalized expenditures, net of accruals													0		0		0
Redemption of noncontrolling interest in unconsolidated variable interest entity															0
Net sale proceeds from wholly-owned properties													0		0		0
Net sale proceeds received from unconsolidated joint ventures																	0
Investments in unconsolidated joint ventures																	0
Deferred lease costs paid													0		0		0
Net cash provided by/(used in) investing activities													0		0		0
Cash Flows from Financing Activities:
Debt issuance costs paid													0		0		0
Proceeds from debt													0		0		0
Repayments of debt													0		0		0
Discount paid due to loan modification																	0
Costs of issuance of common stock													0		0
Shares withheld to pay tax obligations related to employee stock compensation													0		0		0
Repurchases of common stock as part of announced plan													0		0		0
Dividends paid and discount on dividend reinvestments													0		0		0
Net cash provided by/(used in) financing activities													0		0		0
Net increase/(decrease) in cash and cash equivalents													0		0		0
Cash and cash equivalents, beginning of year				$ 0				$ 0				$ 0	0		0		0
Cash and cash equivalents, end of year	$ 0				$ 0				$ 0				$ 0		$ 0		$ 0
[1]	The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

Summary of Significant Accoun54

Summary of Significant Accounting Policies (Details)		12 Months Ended
		Dec. 31, 2016USD ($)propertyvoteunconsolidated_joint_venture$ / sharesshares	Dec. 31, 2015USD ($)$ / sharesshares	Dec. 31, 2014USD ($)	Oct. 31, 2013USD ($)	Dec. 31, 2012class_action_lawsuit
Significant Accounting Policies [Line Items]
Interest capitalized		$ 4,600,000	$ 3,800,000	$ 2,100,000
Intangible Lease Liabilities (Below-Market In-Place Leases)		97,230,000	85,168,000
Amortization of Intangible Lease Origination Costs and In-Place Lease Valuation included in amortization expense		58,150,000	42,278,000	36,007,000
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues		5,066,000	4,571,000	4,727,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
Total		99,695,000	84,663,000
Below Market Lease, Net, Amortization Income, Fiscal Maturity [Abstract]
2,017		9,138,000
2,018		8,470,000
2,019		7,270,000
2,020		5,670,000
2,021		5,468,000
Thereafter		11,989,000
Total		$ 48,005,000
Weighted-Average Amortization Period (in years)		7 years
Significant Accounting Policies [Abstract]
Number of unconsolidated joint ventures | unconsolidated_joint_venture		1
Provision for doubtful accounts		$ 216,000
Amortization of deferred common area maintenance recognized		1,400,000	2,500,000	2,500,000
Capitalized internal leasing costs		400,000	1,000,000	700,000
Amortization of deferred lease costs		50,100,000	42,500,000	40,900,000
Amortization of lease incentive		3,900,000	4,700,000	4,200,000
Amortization of fair value adjustments		500,000	500,000	200,000
Amortization of debt discount		200,000	200,000	200,000
Amortization of deferred financing costs and fair market value adjustments on notes payable		$ 2,900,000	$ 2,800,000	2,700,000
Shares-in-trust, shares authorized | shares		150,000,000	150,000,000
Preferred stock, shares authorized | shares		100,000,000	100,000,000
Common stock, shares authorized | shares		750,000,000	750,000,000
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01
Number of votes for each share of common stock | vote		1
Stock repurchase program, authorized amount					$ 200,000,000
Stock repurchase program, remaining authorized repurchase amount		$ 70,200,000
Dividend reinvestment plan, shareholders discount		2.00%
Number of class action lawsuits settled | class_action_lawsuit						2
Recoveries related to settled class action lawsuits				2,900,000
Net recoveries/(loss)		$ 34,000	$ (278,000)	6,992,000
Business interruption insurance recoveries		0	300,000	1,500,000
Income tax expense		415,000	85,000	0
Reclassification from cash outflows from operating activities to cash outflows from financing activities		$ 235,809,000	219,044,000	217,158,000
Total Revenues Derived from Long Term Leases to Tenants or Reimbursement of Property Tax and Insurance Expenses [Member] | Sales Revenue, Net [Member]
Significant Accounting Policies [Abstract]
Percentage of total revenues		90.00%
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member]
Significant Accounting Policies [Abstract]
Reclassification from cash outflows from operating activities to cash outflows from financing activities			1,700,000	1,300,000
Hurricane Sandy [Member]
Significant Accounting Policies [Abstract]
Net recoveries/(loss)		$ 34,000	(300,000)	4,100,000
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Trading Securities [Member]
Significant Accounting Policies [Abstract]
Assets held as trading securities		200,000
Restatement Adjustment [Member]
Significant Accounting Policies [Abstract]
Provision for doubtful accounts			22,000
Recoveries of bad debts				(5,000)
Net recoveries/(loss)		0	0	0
Reclassification from cash outflows from operating activities to cash outflows from financing activities		0	0	$ 0
Above-Market In-Place Lease Assets [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Assets:		25,425,000	23,684,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2,017		2,590,000
2,018		1,600,000
2,019		910,000
2,020		156,000
2,021		104,000
Thereafter		227,000
Total		$ 5,587,000
Weighted-Average Amortization Period (in years)		3 years
In-Place Lease Valuation [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Assets:		$ 183,422,000	153,991,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2,017		24,511,000
2,018		17,980,000
2,019		13,646,000
2,020		9,614,000
2,021		8,447,000
Thereafter		19,910,000
Total		$ 94,108,000
Weighted-Average Amortization Period (in years)		6 years
Intangible Lease Origination Costs (included as component of Deferred Lease Costs) [Member]
Significant Accounting Policies [Line Items]
Intangible Lease Assets:		$ 261,075,000	$ 208,497,000
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]
2,017	[1]	33,791,000
2,018	[1]	27,156,000
2,019	[1]	22,205,000
2,020	[1]	16,786,000
2,021	[1]	14,731,000
Thereafter	[1]	36,451,000
Total	[1]	$ 151,120,000
Weighted-Average Amortization Period (in years)	[1]	7 years
Building [Member]
Significant Accounting Policies [Line Items]
Useful life		40 years
Building Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life		5 years
Building Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life		25 years
Land Improvements [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life		20 years
Land Improvements [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life		25 years
Furniture, fixtures, and equipment [Member] | Minimum [Member]
Significant Accounting Policies [Line Items]
Useful life		3 years
Furniture, fixtures, and equipment [Member] | Maximum [Member]
Significant Accounting Policies [Line Items]
Useful life		5 years
1201 Eye Street NW Associates LLC and 1225 Eye Street, NW Associates LLC [Member]
Significant Accounting Policies [Line Items]
Number of real estate properties | property		2
Variable Interest Entity, Primary Beneficiary [Member] | 1201 Eye Street NW Associates LLC and 1225 Eye Street, NW Associates LLC [Member]
Significant Accounting Policies [Line Items]
Piedmont’s % Ownership of Entity		100.00%
[1]	Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets.

Summary of Significant Accoun55

Summary of Significant Accounting Policies (Goodwill Reconciliation) (Details) - USD ($) $ in Thousands	12 Months Ended							36 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Goodwill [Roll Forward]
Goodwill	$ 104,786
Goodwill	98,918	$ 104,786
Restatement Adjustment [Member]
Goodwill [Roll Forward]
Goodwill	104,786	148,759	$ 149,957	$ 155,704	$ 160,007	$ 177,540	$ 180,097	$ 0
Purchase of property management companies results in Goodwill (April 2007)								180,097
Goodwill allocated to impairment loss on real estate assets	(5,152)	(38,554)	(1,198)	(4,412)	(4,303)	(17,533)		0
Goodwill allocated to impairment loss on real estate assets	(716)	(3,132)		(1,335)			(2,557)
Goodwill allocated to other assets held for sale		(2,287)
Goodwill	$ 98,918	$ 104,786	$ 148,759	$ 149,957	$ 155,704	$ 160,007	$ 177,540	$ 180,097

Acquisitions and Development 56

Acquisitions and Development Projects (Details)		Nov. 30, 2016USD ($)ft²a	Oct. 07, 2016USD ($)ft²	Aug. 10, 2016USD ($)ft²	Aug. 01, 2016USD ($)ft²building	Dec. 31, 2016USD ($)ft²storybuilding	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Number of properties acquired | building						3
Construction in progress						$ 34,825,000	$ 20,975,000
500 TownPark Building [Member]
Business Acquisition [Line Items]
Rentable Square Feet (Unaudited) | ft²	[1]					134,400
Percentage Leased as of Acquisition (Unaudited)						80.00%
Number of stories of office building | story						4
Construction in progress						$ 24,000,000	$ 1,000,000
Enclave Place [Member]
Business Acquisition [Line Items]
Rentable Square Feet (Unaudited) | ft²	[1]					301,000
Line of Credit [Member] | Unsecured Debt [Member] | $500 Million Unsecured 2015 Line of Credit [Member]
Business Acquisition [Line Items]
Proceeds from Unsecured Line of Credit						$ 500,000,000
CNL Center I and CNL Center II [Member]
Business Acquisition [Line Items]
Number of properties acquired | building					2
Percentage ownership of properties acquired					99.00%
Rentable Square Feet (Unaudited) | ft²					622,488
Percentage Leased as of Acquisition (Unaudited)					95.00%
Net Contractual Purchase Price (in millions)					$ 166,700,000
One Wayside Road [Member]
Business Acquisition [Line Items]
Percentage ownership of properties acquired				100.00%
Rentable Square Feet (Unaudited) | ft²				200,605
Percentage Leased as of Acquisition (Unaudited)				100.00%
Net Contractual Purchase Price (in millions)				$ 62,900,000
Galleria 200 Building [Member]
Business Acquisition [Line Items]
Percentage ownership of properties acquired			100.00%
Rentable Square Feet (Unaudited) | ft²			431,614
Percentage Leased as of Acquisition (Unaudited)			89.00%
Net Contractual Purchase Price (in millions)			$ 69,600,000
750 W. John Carpenter Freeway [Member]
Business Acquisition [Line Items]
Percentage ownership of properties acquired	[1]	100.00%
Rentable Square Feet (Unaudited) | ft²	[1]	314,714
Percentage Leased as of Acquisition (Unaudited)	[1]	78.00%
Net Contractual Purchase Price (in millions)	[1]	$ 50,600,000
Number of acres of adjacent developable land | a		3.5
[1]	Including 3.5 acres of adjacent developable land.

Unconsolidated Joint Venture (D

Unconsolidated Joint Venture (Details) - Fund XIII And REIT Joint Venture [Member] - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Investment [Line Items]
Piedmont’s Ownership Percentage	72.00%
Net Book Value	$ 7,360	$ 7,368

Debt (Details)

Debt (Details)		12 Months Ended
		Dec. 31, 2016USD ($)period		Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Debt Instrument [Line Items]
Weighted average interest rate	[1]	3.43%	[2]	3.55%
Amount of indebtedness outstanding	[1],[2]	$ 2,020,475,000		$ 2,029,510,000
Interest payments		$ 69,000,000		76,400,000	$ 72,100,000
Secured Debt [Member]
Debt Instrument [Line Items]
Weighted average interest rate	[1],[2]	4.64%
Amount of indebtedness outstanding	[1],[2]	$ 332,744,000		501,289,000
Net premium, discounts, and unamortized debt issuance costs	[1]	$ 1,161,000		1,319,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Weighted average interest rate	[1],[2]	3.19%
Amount of indebtedness outstanding	[1],[2]	$ 1,687,731,000		1,528,221,000
Net premium, discounts, and unamortized debt issuance costs	[1]	(10,269,000)		(12,779,000)
$125.0 Million Fixed-Rate Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Amount of principal paid off		$ 125,000,000
Interest rate percentage	[1]	5.50%
Effective rate percentage	[1],[3]	5.50%
Amount of indebtedness outstanding	[1]	$ 0		125,000,000
Face amount of facility		125,000,000
$42.5 Million Fixed-Rate Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Amount of principal paid off		$ 42,500,000
Interest rate percentage	[1]	5.70%
Effective rate percentage	[1],[3]	5.70%
Amount of indebtedness outstanding	[1]	$ 0		42,525,000
Face amount of facility		42,500,000
$500 Million Unsecured 2015 Line of Credit [Member] | Unsecured Debt [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Amount of line of credit		500,000,000
Net borrowings incurred		$ 157,000,000
Effective rate percentage	[1],[3],[4]	1.74%
Amount of indebtedness outstanding	[1],[4],[5]	$ 178,000,000		21,000,000
Face amount of facility		$ 500,000,000
Additional extension period		1 year
Number of extension periods | period		2
Extension period		6 months
$500 Million Unsecured 2015 Line of Credit [Member] | Unsecured Debt [Member] | Line of Credit [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable percentage rate	[1],[4]	1.00%
$140 Million WDC Fixed-Rate Loans [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Interest rate percentage	[1],[6]	5.76%
Effective rate percentage	[1],[3],[6]	5.76%
Amount of indebtedness outstanding	[1],[6]	$ 140,000,000		140,000,000
Face amount of facility		$ 140,000,000
$35.0 Million Fixed-Rate Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Interest rate percentage	[1],[7]	5.55%
Effective rate percentage	[1],[3],[7]	3.75%
Amount of indebtedness outstanding	[1],[7]	$ 31,583,000		32,445,000
Face amount of facility		$ 35,000,000
$160.0 Million Fixed Rate Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Interest rate percentage	[1],[8]	3.48%
Effective rate percentage	[1],[3]	3.58%
Amount of indebtedness outstanding	[1],[8]	$ 160,000,000		160,000,000
Face amount of facility		$ 160,000,000
$170 Million Unsecured 2015 Term Loan [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Effective rate percentage	[1],[3],[4]	1.78%
Amount of indebtedness outstanding	[1],[4]	$ 170,000,000		170,000,000
Face amount of facility		$ 170,000,000
$170 Million Unsecured 2015 Term Loan [Member] | Unsecured Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable percentage rate	[1],[4]	1.125%
$300 Million Unsecured 2013 Term Loan [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Amount of indebtedness outstanding	[1]	$ 300,000,000		300,000,000
Face amount of facility		$ 300,000,000
$300 Million Unsecured 2013 Term Loan [Member] | Unsecured Debt [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Effective rate percentage	[1],[3]	2.78%
$300 Million Unsecured 2013 Term Loan [Member] | Unsecured Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable percentage rate	[1]	1.20%
$300 Million Unsecured 2011 Term Loan [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Amount of indebtedness outstanding	[1]	$ 300,000,000		300,000,000
Face amount of facility		$ 300,000,000
$300 Million Unsecured 2011 Term Loan [Member] | Unsecured Debt [Member] | Interest Rate Swap [Member]
Debt Instrument [Line Items]
Effective rate percentage	[1],[3]	3.35%
$300 Million Unsecured 2011 Term Loan [Member] | Unsecured Debt [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable percentage rate	[1]	1.15%
$350 Million Unsecured Senior Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Interest rate percentage	[1]	3.40%
Effective rate percentage	[1],[3]	3.43%
Amount of indebtedness outstanding	[1]	$ 350,000,000		350,000,000
Face amount of facility		$ 350,000,000
$400 Million Unsecured Senior Notes [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Interest rate percentage	[1]	4.45%
Effective rate percentage	[1],[3]	4.10%
Amount of indebtedness outstanding	[1]	$ 400,000,000		$ 400,000,000
Face amount of facility		$ 400,000,000
[1]	Other than the $35 Million Fixed-Rate Loan, all of Piedmont’s outstanding debt as of December 31, 2016 and 2015 is interest-only.
[2]	Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates in the table as of December 31, 2016.
[3]	Effective rate after consideration of settled or in place interest rate swap agreements and/or issuance premiums or discounts.
[4]	On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length LIBOR locks. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating.
[5]	Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided Piedmont is not then in default and upon payment of extension fees.
[6]	Collateralized by the 1201 and 1225 Eye Street buildings in Washington, D.C.
[7]	Collateralized by the 5 Wall Street building in Burlington, Massachusetts.
[8]	Collateralized by the 1901 Market Street building in Philadelphia, Pennsylvania.

Debt (Maturities of Long-term D

Debt (Maturities of Long-term Debt) (Details) $ in Thousands	Dec. 31, 2016USD ($)
Debt Disclosure [Abstract]
2,017	$ 140,834
2,018	170,960
2,019	479,014	[1]
2,020	301,072
2,021	27,702
Thereafter	910,000
Total	$ 2,029,582
[1]	Includes the balance outstanding as of December 31, 2016 of the $500 Million Unsecured 2015 Line of Credit. However, Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided Piedmont is not then in default and upon payment of extension fees.

Variable Interest Entities an60

Variable Interest Entities and Equity Participation Rights (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
1201 Eye Street N.W. Associates, LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	49.50%
Net Carrying Amount	$ (6.7)	$ (7.4)
Percent of cash flow entitled to entity	100.00%
1225 Eye Street N.W. Associates, LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	49.50%
Net Carrying Amount	$ 9.9	3.8
Percent of cash flow entitled to entity	100.00%
Piedmont 500 W. Monroe Fee LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	100.00%
Net Carrying Amount	$ 262.4	$ 251.4
Percent of cash flow entitled to entity	100.00%

Derivative Instruments (Details

Derivative Instruments (Details)	12 Months Ended
	Dec. 31, 2016USD ($)contract	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Derivative [Line Items]
Net gain/ (loss) related to hedge ineffectiveness and terminations of cash flow hedges	$ 0	$ 37,000	$ 0
Maximum length of time of cash flow hedge	36 months
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net [Abstract]
Gross derivative assets	$ 0	0
Interest rate swaps	8,169,000	9,993,000
Net derivative liability	8,169,000	9,993,000
Amount that will be reclassified from accumulated other comprehensive income over the next twelve months	4,100,000
Unsecured Debt [Member]
Derivative [Line Items]
Total notional amount of forward starting interest rate agreements	600,000,000
Interest Rate Contract [Member] | Interest Expense [Member]
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net [Abstract]
Amount of gain/(loss) recognized in OCI on derivatives	(4,126,000)	(12,509,000)	(17,122,000)
Amount of previously recorded loss reclassified from accumulated OCI into interest expense	4,548,000	$ 5,875,000	$ 5,145,000
Forward Starting Interest Rate Swap [Member]
Derivative [Line Items]
Total notional amount of forward starting interest rate agreements	$ 250,000,000
Number of forward starting interest rate swaps settled | contract	4
Forward Starting Interest Rate Swap [Member] | Interest Expense [Member]
Derivative [Line Items]
Settlement value of forward starting interest rate swaps	$ 100,000
Credit Risk Contract [Member]
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net [Abstract]
Assets needed for immediate settlement, aggregate fair value	8,400,000
$300 Million Unsecured 2011 Term Loan [Member] | Unsecured Debt [Member]
Derivative [Line Items]
Face amount of facility	300,000,000
$300 Million Unsecured 2011 Term Loan [Member] | Interest Rate Swap 7 through 9 [Member] | Unsecured Debt [Member]
Derivative [Line Items]
Total notional amount of forward starting interest rate agreements	$ 300,000,000
Number of Swap Agreements | contract	3
$300 Million Unsecured 2013 Term Loan [Member] | Unsecured Debt [Member]
Derivative [Line Items]
Face amount of facility	$ 300,000,000
$300 Million Unsecured 2013 Term Loan [Member] | Interest Rate Swap 1 through 4 [Member] | Unsecured Debt [Member]
Derivative [Line Items]
Total notional amount of forward starting interest rate agreements	$ 200,000,000
Number of Swap Agreements | contract	4
$300 Million Unsecured 2013 Term Loan [Member] | Interest Rate Swap 5 through 6 [Member] | Unsecured Debt [Member]
Derivative [Line Items]
Total notional amount of forward starting interest rate agreements	$ 100,000,000
Number of Swap Agreements | contract	2
$160.0 Million Fixed Rate Loan [Member] | Secured Debt [Member]
Derivative [Line Items]
Face amount of facility	$ 160,000,000
Total notional amount of forward starting interest rate agreements	250,000,000
Net loss from settlement of forward starting interest rate swaps	1,300,000
Net gain/ (loss) related to hedge ineffectiveness and terminations of cash flow hedges	$ 100,000
Term of loan	7 years

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability		$ 8,169	$ 9,993
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	[1]	6,992	5,441
Tenant receivables, net and Notes receivable	[1]	26,494	26,339
Restricted cash and escrows	[1]	1,212	5,174
Accounts payable and accrued expenses	[1]	44,733	13,188
Debt, net		2,020,475	2,029,510
Carrying Value [Member] | Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability		8,169	9,993
Carrying Value [Member] | Notes Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Tenant receivables, net and Notes receivable	[1]	0	45,400
Estimated Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	[1]	6,992	5,441
Tenant receivables, net and Notes receivable	[1]	26,494	26,339
Restricted cash and escrows	[1]	1,212	5,174
Accounts payable and accrued expenses	[1]	44,733	13,188
Estimated Fair Value [Member] | Fair Value, Inputs, Level 1 [Member] | Notes Receivable [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Tenant receivables, net and Notes receivable	[1]	0	45,400
Estimated Fair Value [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, net		2,027,436	2,039,139
Estimated Fair Value [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability		$ 8,169	$ 9,993
[1]	For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to its short-term maturity.

Impairment Loss on Real Estat63

Impairment Loss on Real Estate Assets (Details) $ in Thousands

3 Months Ended

12 Months Ended

Dec. 31, 2016USD ($)

Sep. 30, 2016USD ($)

Jun. 30, 2016USD ($)

Mar. 31, 2016USD ($)

Dec. 31, 2015USD ($)

Sep. 30, 2015USD ($)

Jun. 30, 2015USD ($)

Mar. 31, 2015USD ($)

Dec. 31, 2016USD ($)

Dec. 31, 2015USD ($)

Dec. 31, 2014USD ($)

Jul. 31, 2016property

Impaired Long-Lived Assets Held and Used [Line Items]

Impairment loss on real estate assets

$ 0

$ 22,951

$ 10,950

$ 0

$ 0

$ 37,105

$ 6,196

$ 0

$ 33,901

[1]

$ 43,301

[1]

$ 0

[1]

Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Eastpoint I & II [Member]

Impaired Long-Lived Assets Held and Used [Line Items]

Impairment loss on real estate assets

[2]

0

6,195

0

Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | 2 Gatehall Drive [Member]

Impaired Long-Lived Assets Held and Used [Line Items]

Impairment loss on real estate assets

[2]

0

37,106

0

Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | 150 West Jefferson [Member]

Impaired Long-Lived Assets Held and Used [Line Items]

Impairment loss on real estate assets

[2]

8,259

0

0

Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | 9200 and 9211 Corporate Boulevard [Member]

Impaired Long-Lived Assets Held and Used [Line Items]

Impairment loss on real estate assets

[3]

22,950

0

0

Number of assets sold | property

2

Impairment loss

23,000

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 9221 Corporate Boulevard [Member]

Impaired Long-Lived Assets Held and Used [Line Items]

Impairment loss on real estate assets

[4]

2,692

$ 0

$ 0

Loss on impairment

$ 2,700

[1]

The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

[2]

Piedmont recognized an impairment loss on real estate assets based upon the difference between the carrying value of the asset including a proportionate amount of goodwill and the contracted sales price, less estimated selling costs.

[3]

Piedmont elected to sell its remaining two assets and exit the Rockville, Maryland sub-market of Washington, D.C, after selling the 9221 Corporate Boulevard building in July 2016 (mentioned above). Upon management's change in its hold period assumption for the assets from a long-term hold to a near-term sale, Piedmont recognized an impairment loss of approximately $23.0 million. The impairment loss was calculated as the difference between the carrying value of the asset including a proportionate amount of goodwill and the anticipated contracted sales price, less estimated selling costs.

[4]

Piedmont, using a probability-weighted model heavily weighted towards the short-term sale of the 9221 Corporate Boulevard building in Rockville, Maryland, determined that the carrying value would not be recovered from the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition. As a result, Piedmont recognized a loss on impairment of approximately $2.7 million during the year ended December 31, 2016 calculated as the difference between the carrying value of the asset including a proportionate amount of goodwill and the anticipated contract sales price, less estimated selling costs.

Commitments and Contingencies64

Commitments and Contingencies (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)category	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)
Loss Contingencies [Line Items]
Number of tenant and building improvement categories | category	2
Operating Leases, Future Minimum Payments Due [Abstract]
2,017	$ 93
2,018	93
2,019	93
2,020	93
2,021	93
Thereafter	2,439
Total	2,904
Land [Member]
Operating Leases, Future Minimum Payments Due [Abstract]
Ground rent expense	100	$ 200	$ 500
Building [Member]
Operating Leases, Future Minimum Payments Due [Abstract]
Net book value of real estate assets subject to operating ground leases	4,700	5,000
Collectibility of Tenant Reimbursements [Member]
Loss Contingencies [Line Items]
Additional expense related to such tenant audits/disputes	$ 1,100	$ 400	$ 600
NonIncremental Capital Expenditures [Member]
Loss Contingencies [Line Items]
Period for commitments for funding non-incremental capital expenditures	3 years
Non-incremental capital expenditures for tenant improvements	$ 35,300
NonIncremental Capital Expenditures [Member] | Maximum [Member]
Loss Contingencies [Line Items]
Period for commitments for funding non-incremental capital expenditures	5 years
Incremental Capital Expenditures [Member]
Loss Contingencies [Line Items]
Non-incremental capital expenditures for tenant improvements	$ 29,800

Stock Based Compensation (Detai

Stock Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands

May 24, 2016

May 12, 2016

May 01, 2015

May 09, 2014

Jan. 03, 2014

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

May 24, 2016

May 12, 2016

May 01, 2015

May 09, 2014

Jan. 03, 2014

Stock Awards [Member]

Rollforward of deferred stock award activity

Unvested Deferred Stock Awards as of the beginning of the year (in shares)

959,446

Unvested Deferred Stock Awards as of end of the year (in shares)

944,223

959,446

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at beginning of year (in dollars per share)

$ 18.67

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)

19.44

$ 18.67

Grant Date Fair Value (in dollars per share)

$ 18.67

$ 18.67

Unvested Shares (in shares)

959,446

959,446

Deferred Stock Award [Member]

Rollforward of deferred stock award activity

Deferred Stock Awards Granted (in shares)

319,083

Deferred Stock Awards Vested (in shares)

(258,776)

Deferred Stock Awards Forfeited (in shares)

(19,885)

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Deferred Stock Awards Granted, Weighted-Average Grant Date Fair (in dollars per share)

$ 19.96

$ 17.59

$ 17.78

Deferred Stock Awards Vested, Weighted-Average Grant Date Fair Value (in dollars per share)

18.57

Deferred Stock Awards Forfeited, Weighted Average Grant Date Fair Value (in dollars per share)

$ 18.29

Total Grant Date Fair Value of Deferred Stock Vested During the Period

$ 4,806

$ 4,239

$ 3,353

Performance Shares [Member]

Rollforward of deferred stock award activity

Increase in Estimated Potential Future Performance Share Awards, net of forfeitures (in shares)

(2,358)

Deferred Stock Awards Vested (in shares)

(53,287)

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Increase in Estimated Potential Future Performance Share Awards, Weighted Average Grant Date Fair Value (in dollars per share)

$ 21.22

Deferred Stock Awards Vested, Weighted-Average Grant Date Fair Value (in dollars per share)

$ 18.91

Share-based Liability Awards Paid During the Period

[1]

$ 1,127

$ 0

$ 0

Deferred Stock Award, Granted January 3, 2014 [Member] | Deferred Stock Award [Member]

Rollforward of deferred stock award activity

Unvested Deferred Stock Awards as of end of the year (in shares)

52,886

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)

$ 16.45

Net Shares Granted (in shares)

[2]

86,512

Grant Date Fair Value (in dollars per share)

$ 16.45

$ 16.45

Unvested Shares (in shares)

52,886

Deferred Stock Award, Granted January 3, 2014 [Member] | Share-based Compensation Award, Tranche One [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

20.00%

Deferred Stock Award, Granted January 3, 2014 [Member] | Share-based Compensation Award, Tranche Two [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

20.00%

Deferred Stock Award, Granted January 3, 2014 [Member] | Share-based Compensation Award, Tranche Three [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

20.00%

Deferred Stock Award, Granted January 3, 2014 [Member] | Share-based Compensation Award, Tranche Four [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

20.00%

Deferred Stock Award, Granted January 3, 2014 [Member] | Share-based Compensation Award, Tranche Five [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

20.00%

Deferred Stock Award, Granted May 9, 2014 [Member] | Deferred Stock Award [Member]

Rollforward of deferred stock award activity

Unvested Deferred Stock Awards as of end of the year (in shares)

44,047

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)

$ 18.47

Net Shares Granted (in shares)

[2]

144,625

Grant Date Fair Value (in dollars per share)

$ 18.47

$ 18.47

Unvested Shares (in shares)

44,047

Deferred Stock Award, Granted May 9, 2014 [Member] | Share-based Compensation Award, Tranche One [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Deferred Stock Award, Granted May 9, 2014 [Member] | Share-based Compensation Award, Tranche Two [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Deferred Stock Award, Granted May 9, 2014 [Member] | Share-based Compensation Award, Tranche Three [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Deferred Stock Award, Granted May 9, 2014 [Member] | Share-based Compensation Award, Tranche Four [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Performance Share Program Award, Granted May 9, 2014 [Member] | Performance Shares [Member]

Rollforward of deferred stock award activity

Unvested Deferred Stock Awards as of end of the year (in shares)

[3]

118,448

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)

$ 22

Net Shares Granted (in shares)

[2]

0

Grant Date Fair Value (in dollars per share)

$ 22

$ 22

Unvested Shares (in shares)

[3]

118,448

Deferred Stock Award, Granted May 1, 2015 [Member] | Deferred Stock Award [Member]

Rollforward of deferred stock award activity

Unvested Deferred Stock Awards as of end of the year (in shares)

138,128

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)

$ 17.59

Net Shares Granted (in shares)

[2]

243,884

Grant Date Fair Value (in dollars per share)

$ 17.59

$ 17.59

Unvested Shares (in shares)

138,128

Deferred Stock Award, Granted May 1, 2015 [Member] | Share-based Compensation Award, Tranche One [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Deferred Stock Award, Granted May 1, 2015 [Member] | Share-based Compensation Award, Tranche Two [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Deferred Stock Award, Granted May 1, 2015 [Member] | Share-based Compensation Award, Tranche Three [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Deferred Stock Award, Granted May 1, 2015 [Member] | Share-based Compensation Award, Tranche Four [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Performance Share Program Award, Granted May 1, 2015 [Member] | Performance Shares [Member]

Rollforward of deferred stock award activity

Unvested Deferred Stock Awards as of end of the year (in shares)

[3]

268,358

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)

$ 18.42

Net Shares Granted (in shares)

[2]

0

Grant Date Fair Value (in dollars per share)

$ 18.42

$ 18.42

Unvested Shares (in shares)

[3]

268,358

Deferred Stock Award, Granted May 12, 2016 [Member] | Deferred Stock Award [Member] | Independent directors [Member]

Rollforward of deferred stock award activity

Unvested Deferred Stock Awards as of end of the year (in shares)

31,368

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)

$ 20.40

Net Shares Granted (in shares)

[2]

31,368

Grant Date Fair Value (in dollars per share)

$ 20.40

$ 20.40

Unvested Shares (in shares)

31,368

Deferred Stock Award, Granted May 12, 2016 [Member] | Share-based Compensation Award, Tranche One [Member] | Deferred Stock Award [Member] | Independent directors [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

100.00%

Deferred Stock Award, Granted May 24, 2016 [Member] | Deferred Stock Award [Member]

Rollforward of deferred stock award activity

Unvested Deferred Stock Awards as of end of the year (in shares)

206,380

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)

$ 19.91

Net Shares Granted (in shares)

[2]

259,957

Grant Date Fair Value (in dollars per share)

$ 19.91

$ 19.91

Unvested Shares (in shares)

206,380

Deferred Stock Award, Granted May 24, 2016 [Member] | Share-based Compensation Award, Tranche One [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Deferred Stock Award, Granted May 24, 2016 [Member] | Share-based Compensation Award, Tranche Two [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Deferred Stock Award, Granted May 24, 2016 [Member] | Share-based Compensation Award, Tranche Three [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Deferred Stock Award, Granted May 24, 2016 [Member] | Share-based Compensation Award, Tranche Four [Member] | Deferred Stock Award [Member]

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Vesting percentage

25.00%

Performance Share Program Award, Granted May 24, 2016 [Member] | Performance Shares [Member]

Rollforward of deferred stock award activity

Unvested Deferred Stock Awards as of end of the year (in shares)

[3]

84,608

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year (in dollars per share)

$ 23.02

Net Shares Granted (in shares)

[2]

0

Grant Date Fair Value (in dollars per share)

$ 23.02

$ 23.02

Unvested Shares (in shares)

[3]

84,608

[1]

Amounts reflect the issuance of performance share awards related to the 2013-15 Performance Share Plan during the period.

[2]

Amounts reflect the total grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2016.

[3]

Estimated based on Piedmont's cumulative TSR for the respective performance period through December 31, 2016. Share estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.

Stock Based Compensation (Narra

Stock Based Compensation (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense and directors' fees related to stock awards	$ 8	$ 8.9	$ 5.3
Compensation expense, non-vested awards	$ 6.5	$ 7	$ 3.8
Number of shares issued to employees, directors and officers	185,169
Nonvested awards, total compensation cost not yet recognized	$ 3.8
Weighted Average [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested awards, total compensation cost not yet recognized, period for recognition	1 year
Stock Awards [Member] | Independent directors [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year

Earnings Per Share (Details)

Earnings Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Weighted-average common shares—basic	145,230,382	150,537,757	154,452,121
Deferred and performance stock awards (in shares)	405,000	342,000	133,000
Weighted-average shares outstanding - diluted	145,634,953	150,880,116	154,585,273
Common stock, shares outstanding	145,235,313	145,511,644	154,324,089

Operating Leases (Details)

Operating Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2016USD ($)
Revenues from External Customers and Long-Lived Assets [Line Items]
Percentage of annualized lease revenue	87.00%
Operating Leases, Future Minimum Payments Receivable [Abstract]
2,017	$ 434,871
2,018	426,532
2,019	395,212
2,020	359,636
2,021	323,940
Thereafter	1,615,265
Total	$ 3,555,456
Customer Concentration Risk [Member] | Federal Governmental Agencies [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Concentration risk, percentage	8.20%

Property Dispositions, Assets69

Property Dispositions, Assets Held for Sale and Discontinued Operations (Property Dispositions) (Details) - USD ($) $ in Thousands

Dec. 29, 2016

Dec. 22, 2016

Sep. 28, 2016

Jul. 29, 2016

Jul. 27, 2016

May 02, 2016

Apr. 28, 2016

Apr. 21, 2016

Dec. 21, 2015

Oct. 29, 2015

Sep. 01, 2015

Aug. 10, 2015

Jul. 28, 2015

May 01, 2015

Apr. 29, 2015

Apr. 28, 2015

Jan. 30, 2015

May 29, 2014

May 19, 2014

Dec. 31, 2016

Dec. 31, 2015

Dec. 31, 2014

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

Net Sales Proceeds

$ 365,918

$ 848,169

$ 46,232

Notes receivable

$ 0

$ 45,400

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 2020 W. 89th Street [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 870

Net Sales Proceeds

$ 5,515

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Two Park Center [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

[1]

$ (169)

Net Sales Proceeds

[1]

$ 6,017

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 3900 Dallas Parkway [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 8,940

Net Sales Proceeds

$ 25,803

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 5601 Headquarters Drive [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 6,390

Net Sales Proceeds

$ 33,326

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | River Corporate Center [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 4,144

Net Sales Proceeds

$ 24,223

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Copper Ridge Center [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 11,358

Net Sales Proceeds

[2]

50,372

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Copper Ridge Center [Member] | Notes Receivable [Member] | Secured Promissory Note [Member]

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

Notes receivable

$ 45,400

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Eastpoint I & II [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

[3]

$ (177)

Net Sales Proceeds

$ 17,342

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 3750 Brookside Parkway [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 761

Net Sales Proceeds

$ 13,624

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Chandler Forum [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 13,805

Net Sales Proceeds

$ 32,267

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Aon Center [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 84,218

Net Sales Proceeds

$ 646,243

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 2 Gatehall Drive [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

[3]

$ 162

Net Sales Proceeds

$ 50,369

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 1055 East Colorado [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 29,462

Net Sales Proceeds

$ 60,076

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Fairway Center II [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 14,406

Net Sales Proceeds

$ 33,062

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 1901 Main Street [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 29,964

Net Sales Proceeds

[4]

63,149

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 1901 Main Street [Member] | Notes Receivable [Member] | Secured Promissory Note [Member]

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

Notes receivable

$ 33,000

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 9221 Corporate Boulevard [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

[3]

$ (192)

Net Sales Proceeds

$ 12,035

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 150 West Jefferson [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

[3]

$ (664)

Net Sales Proceeds

$ 77,844

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 9200 and 9211 Corporate Boulevard [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

[3]

$ (41)

Net Sales Proceeds

$ 12,519

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | 11695 Johns Creek Parkway [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 1,978

Net Sales Proceeds

$ 13,827

Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member] | Braker Pointe III [Member]

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

Revised (2014) or Restated Gain/(Loss) on Sale

$ 18,579

Net Sales Proceeds

$ 48,006

[1]

Property was owned as part of the unconsolidated joint venture, Fund XIII and REIT Joint Venture. As such, the loss on sale was presented as equity in income/(loss) of unconsolidated joint ventures.

[2]

As part of the transaction, Piedmont accepted a secured promissory note from the buyer for the remaining $45.4 million owed on the sale. During the year ended December 31, 2016, the note receivable was repaid in full and such proceeds are reflected in the accompanying consolidated statements of cash flows as net sales proceeds from the sale of wholly-owned properties.

[3]

As discussed in Note 10 above, Piedmont recognized an impairment loss prior to, or in conjunction with, the sale of the property. Therefore, any gain/(loss) recognized upon the consummation of the sale consists solely of adjustments made subsequent to the sale for closing cost estimates or post-closing prorations.

[4]

As part of the transaction, Piedmont accepted a secured promissory note from the buyer for $33.0 million, and the note receivable was repaid in full during the year ended December 31, 2016. As such, the full proceeds from the sale of the property are reflected in the accompanying consolidated statements of cash flows as net sales proceeds from the sale of wholly-owned properties.

Property Dispositions, Assets70

Property Dispositions, Assets Held for Sale, and Discontinued Operations (Assets Held-for-Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total other assets held for sale, net	$ 0	$ 0	$ 8,761	$ 11,236	$ 10,777	$ 10,038	$ 9,938	$ 9,703
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total real estate assets held for sale, net	0				76,614
Straight-line rent receivables	0				4,729
Prepaid expenses and other assets	0				66
Allocation of goodwill (see Note 2)	0				2,287
Deferred lease costs, less accumulated amortization of $0 and $1,162 as of December 31, 2016 and 2015, respectively	0				3,695
Accumulated amortization on deferred lease costs	0				1,162
Total other assets held for sale, net	0				10,777
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Land [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net:	0				9,759
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Building and building improvements [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net:	0				66,840
Accumulated depreciation (building improvements)	0				32,162
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Construction in Progress [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net:	$ 0				$ 15

Property Dispositions, Assets71

Property Dispositions, Assets Held for Sale, and Discontinued Operations (Discontinued Operations) (Details) - USD ($) $ in Thousands	Apr. 30, 2014	Mar. 19, 2014	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(Loss) on Sale															$ 0	$ (1)	$ 262
Net Sales Proceeds															365,918	848,169	46,232
Other income (expense):
Operating income, excluding gain/(loss) on sale of real estate assets															0	84	954
Gain/(loss) on sale of real estate assets															0	(1)	262
Income from discontinued operations			$ 0	$ 1	$ (1)	$ 0	$ 72	$ 14	$ (3)	$ 0	$ (42)	$ 16	$ 882	$ 360	0	83	1,216
Discontinued Operations [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(Loss) on Sale															0	(1)	262
Revenues:
Rental income															0	19	1,365
Tenant reimbursements															0	64	125
Property management fee revenue															0	0	1
Revenue															0	83	1,491
Expenses:
Property operating costs															0	(1)	225
Depreciation															0	0	83
Amortization															0	0	223
Expenses															0	(1)	531
Other income (expense):
Other income/(expense)															0	0	(6)
Total Other income (expense)															0	0	(6)
Operating income, excluding gain/(loss) on sale of real estate assets															0	84	954
Gain/(loss) on sale of real estate assets															0	(1)	262
Income from discontinued operations															$ 0	$ 83	$ 1,216
Discontinued Operations, Disposed of by Sale [Member] | 11107 and 11109 Sunset Hills Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(Loss) on Sale		$ (102)
Net Sales Proceeds		22,326
Other income (expense):
Gain/(loss) on sale of real estate assets		$ (102)
Discontinued Operations, Disposed of by Sale [Member] | 1441 West Long Lake Road [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(Loss) on Sale	$ 182
Net Sales Proceeds	7,202
Other income (expense):
Gain/(loss) on sale of real estate assets	182
Discontinued Operations, Disposed of by Sale [Member] | 4685 Investment Drive [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(Loss) on Sale	191
Net Sales Proceeds	11,198
Other income (expense):
Gain/(loss) on sale of real estate assets	$ 191

Supplemental Disclosures of N72

Supplemental Disclosures of Noncash Activities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Cash Flow Elements [Abstract]
Accrued capital expenditures and deferred lease costs	$ 14,427	$ 20,630	$ 19,896
Accrued dividends and discount on dividend reinvestments	30,532	0	0
Escrowed cash from prior year applied to acquisitions in the current year	0	(5,050)	0
Change in accrued share repurchases as part of an announced plan	$ 0	$ 0	$ (2,006)

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended													12 Months Ended
	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Line Items]
GAAP basis financial statement net income	$ 30,189		$ (13,107)	$ 72,278	$ 10,372	$ 95,660	$ (6,512)	$ 24,044	$ 18,112	$ 12,514	$ 9,162	$ 11,081	$ 9,393	$ 99,732		$ 131,304	$ 42,150
Depreciation and amortization expense recognized for financial reporting purposes in excess of amounts recognized for income tax purposes														69,214		(1,717)	50,810
Rental income accrued for income tax purposes less than amounts for financial reporting purposes														(18,964)		(12,123)	(28,504)
Net amortization of above/below-market lease intangibles for income tax purposes in excess of amounts for financial reporting purposes														(4,895)		(4,614)	(4,705)
Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes														(118,713)		(43,493)	(28,360)
Other expenses, including impairment loss on real estate assets, for financial reporting purposes in excess of amounts for income tax purposes														42,019		54,425	5,727
Income tax basis net income, prior to dividends paid deduction														$ 67,999		$ 126,273	$ 36,650
Ordinary income, Percent														81.77%		31.75%	29.32%
Return of capital, Percent														18.23%		0.00%	70.68%
Capital gains, Percent														0.00%		68.25%	0.00%
Common Stock Dividends, Percent														100.00%		100.00%	100.00%
Tax basis of total assets	4,300,000	[1]				4,200,000								$ 4,300,000	[1]	$ 4,200,000
Accrued interest and penalties related to uncertain tax positions	$ 3,800					$ 3,800								3,800		3,800
Piedmont Washington Properties, Inc [Member]
Income Taxes [Line Items]
Taxable income (loss) in excess of amount for financial reporting purposes														(1,042)		2,491	$ (468)
Piedmont Office Holdings, Inc [Member]
Income Taxes [Line Items]
Taxable income (loss) in excess of amount for financial reporting purposes														$ 648		$ 0	$ 0
[1]	The net carrying value of Piedmont’s total assets for federal income tax purposes is approximately $4.3 billion.

Quarterly Results (unaudited)74

Quarterly Results (unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Statement of Income Data:
Revenues	$ 143,911	$ 138,485	$ 135,307	$ 138,012	$ 139,461	$ 148,815	$ 146,734	$ 149,759	$ 146,711	$ 144,641	$ 138,580	$ 136,320	$ 555,715		$ 584,769		$ 566,252
Impairment loss on real estate assets	0	22,951	10,950	0	0	37,105	6,196	0					33,901	[1]	43,301	[1]	0	[1]
Real estate operating income	26,633	2,988	14,791	26,372	28,938	(3,424)	19,983	28,214	28,789	27,199	26,556	25,277	70,784		73,711		107,821
Income/(loss) from continuing operations	10,529	(13,065)	(1,553)	10,396	11,164	(21,318)	2,531	9,176	12,567	9,150	9,325	9,037	6,307		1,553		40,079
Income/(loss) from discontinued operations	0	1	(1)	0	72	14	(3)	0	(42)	16	882	360	0		83		1,216
Gain/(loss) on sale of real estate assets	19,652	(57)	73,835	(20)	84,427	14,796	21,520	8,940	(8)	0	878	0	93,410		129,683		870
Net income	30,181	(13,121)	72,281	10,376	95,663	(6,508)	24,048	18,116	12,517	9,166	11,085	9,397	99,717		131,319		42,165
Net income applicable to Piedmont	$ 30,189	$ (13,107)	$ 72,278	$ 10,372	$ 95,660	$ (6,512)	$ 24,044	$ 18,112	$ 12,514	$ 9,162	$ 11,081	$ 9,393	$ 99,732		$ 131,304		$ 42,150
Per share information— basic and diluted:
Net income/(loss) applicable to Piedmont	$ 0.21	$ (0.09)	$ 0.50	$ 0.07	$ 0.65	$ (0.05)	$ 0.15	$ 0.12	$ 0.08	$ 0.06	$ 0.07	$ 0.06	$ 0.69		$ 0.87		$ 0.27
Dividends declared per share	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.2	$ 0.2	$ 0.2
Balance Sheet Data:
Goodwill	$ 98,918	$ 98,918	$ 99,278	$ 104,786	$ 104,786	$ 134,770	$ 139,407	$ 145,340					$ 98,918		$ 104,786
Other assets held for sale, net	0	0	8,761	11,236	10,777	10,038	9,938	9,703					0		10,777
Total assets	4,368,168	4,307,118	4,217,680	4,281,993	4,361,511	4,689,613	4,735,408	4,780,000					4,368,168		4,361,511
Debt, net	2,020,475	1,994,078	1,884,314	2,002,918	2,029,510	2,421,099	2,312,804	2,318,717					2,020,475		2,029,510
Cumulative distributions in excess of earnings	(1,580,863)	(1,580,553)	(1,536,948)	(1,578,728)	(1,550,698)	(1,613,418)	(1,465,715)	(1,411,258)					(1,580,863)		(1,550,698)
Piedmont stockholders' equity	2,095,821	2,085,906	2,124,870	2,085,610	2,122,395	2,048,669	2,216,423	2,252,423					2,095,821		2,122,395
Total stockholders' equity	2,097,703	2,087,804	2,125,895	2,086,639	2,123,420	2,049,698	2,217,448	2,253,452	$ 2,280,677				2,097,703		2,123,420		$ 2,280,677		$ 2,431,019
Total liabilities and stockholders' equity	$ 4,368,168	$ 4,307,118	$ 4,217,680	$ 4,281,993	$ 4,361,511	$ 4,689,613	$ 4,735,408	$ 4,780,000					$ 4,368,168		$ 4,361,511
[1]	The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

Guarantor and Non-Guarantor F75

Guarantor and Non-Guarantor Financial Information- Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Assets:
Land	$ 669,848				$ 676,091
Buildings and improvements, less accumulated depreciation	2,927,324				2,837,463
Intangible lease assets, less accumulated amortization	99,695				84,663
Construction in progress	34,825				20,975
Real estate assets held for sale, net	0				76,614
Total real estate assets	3,731,692				3,695,806
Investments in and amounts due from unconsolidated joint ventures	7,360				7,577
Cash and cash equivalents	6,992				5,441				$ 12,306	$ 6,973
Tenant and straight-line receivables, net	192,342				173,732
Advances to affiliates	0				0
Investment in subsidiary	0				0
Notes receivable	0				45,400
Prepaid expenses, restricted cash, escrows, and other assets	24,867				29,951
Goodwill	98,918	$ 98,918	$ 99,278	$ 104,786	104,786	$ 134,770	$ 139,407	$ 145,340
Deferred lease costs, net	305,997				288,041
Other assets held for sale, net	0	0	8,761	11,236	10,777	10,038	9,938	9,703
Total assets	4,368,168	4,307,118	4,217,680	4,281,993	4,361,511	4,689,613	4,735,408	4,780,000
Liabilities:
Debt, net	2,020,475	1,994,078	1,884,314	2,002,918	2,029,510	2,421,099	2,312,804	2,318,717
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	165,410				128,465
Advances from affiliates	0				0
Deferred income	28,406				27,270
Intangible lease liabilities, net	48,005				42,853
Interest rate swaps	8,169				9,993
Total liabilities	2,270,465				2,238,091
Stockholders’ Equity:
Common stock	1,452				1,455
Additional paid-in capital	3,673,128				3,669,977
Retained/(cumulative distributions in excess of) earnings	(1,580,863)	(1,580,553)	(1,536,948)	(1,578,728)	(1,550,698)	(1,613,418)	(1,465,715)	(1,411,258)
Other comprehensive loss	2,104				1,661
Piedmont stockholders’ equity	2,095,821	2,085,906	2,124,870	2,085,610	2,122,395	2,048,669	2,216,423	2,252,423
Noncontrolling interest	1,882				1,025
Total stockholders’ equity	2,097,703	2,087,804	2,125,895	2,086,639	2,123,420	2,049,698	2,217,448	2,253,452	2,280,677	2,431,019
Total liabilities and stockholders’ equity	4,368,168	$ 4,307,118	$ 4,217,680	$ 4,281,993	4,361,511	$ 4,689,613	$ 4,735,408	$ 4,780,000
Eliminations [Member]
Assets:
Land	0				0
Buildings and improvements, less accumulated depreciation	(300)				(300)
Intangible lease assets, less accumulated amortization	0				0
Construction in progress	0				0
Real estate assets held for sale, net					0
Total real estate assets	(300)				(300)
Investments in and amounts due from unconsolidated joint ventures	0				0
Cash and cash equivalents	0				0				0	0
Tenant and straight-line receivables, net	0				0
Advances to affiliates	(7,779,751)				(7,378,873)
Investment in subsidiary	(3,630,745)				(3,752,709)
Notes receivable	(184,700)				(113,240)
Prepaid expenses, restricted cash, escrows, and other assets	(1,897)				(1,258)
Goodwill	0				0
Deferred lease costs, net	0				0
Other assets held for sale, net					0
Total assets	(11,597,393)				(11,246,380)
Liabilities:
Debt, net	(184,700)				(113,240)
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	(1,897)				(1,258)
Advances from affiliates	(7,878,007)				(7,456,369)
Deferred income	0				0
Intangible lease liabilities, net	0				0
Interest rate swaps	0				0
Total liabilities	(8,064,604)				(7,570,867)
Stockholders’ Equity:
Common stock	0				0
Additional paid-in capital	(3,630,745)				(3,752,710)
Retained/(cumulative distributions in excess of) earnings	97,956				77,197
Other comprehensive loss	0				0
Piedmont stockholders’ equity	(3,532,789)				(3,675,513)
Noncontrolling interest	0				0
Total stockholders’ equity	(3,532,789)				(3,675,513)
Total liabilities and stockholders’ equity	(11,597,393)				(11,246,380)
Issuer [Member]
Assets:
Land	46,133				54,459
Buildings and improvements, less accumulated depreciation	228,194				270,057
Intangible lease assets, less accumulated amortization	725				1,268
Construction in progress	145				240
Real estate assets held for sale, net					76,614
Total real estate assets	275,197				402,638
Investments in and amounts due from unconsolidated joint ventures	7,360				7,577
Cash and cash equivalents	3,674				2,174				8,143	3,261
Tenant and straight-line receivables, net	20,159				23,738
Advances to affiliates	6,464,135				6,127,343
Investment in subsidiary	0				0
Notes receivable	88,910				134,750
Prepaid expenses, restricted cash, escrows, and other assets	6,189				7,091
Goodwill	98,918				104,786
Deferred lease costs, net	16,550				20,939
Other assets held for sale, net					10,777
Total assets	6,981,092				6,841,813
Liabilities:
Debt, net	1,701,933				1,552,007
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	17,365				18,954
Advances from affiliates	708,340				580,526
Deferred income	5,206				5,905
Intangible lease liabilities, net	0				0
Interest rate swaps	8,169				9,993
Total liabilities	2,441,013				2,167,385
Stockholders’ Equity:
Common stock	0				0
Additional paid-in capital	3,626,564				3,748,524
Retained/(cumulative distributions in excess of) earnings	911,411				924,243
Other comprehensive loss	2,104				1,661
Piedmont stockholders’ equity	4,540,079				4,674,428
Noncontrolling interest	0				0
Total stockholders’ equity	4,540,079				4,674,428
Total liabilities and stockholders’ equity	6,981,092				6,841,813
Guarantor [Member]
Assets:
Land	0				0
Buildings and improvements, less accumulated depreciation	0				0
Intangible lease assets, less accumulated amortization	0				0
Construction in progress	0				0
Real estate assets held for sale, net					0
Total real estate assets	0				0
Investments in and amounts due from unconsolidated joint ventures	0				0
Cash and cash equivalents	150				150				1,790	150
Tenant and straight-line receivables, net	0				0
Advances to affiliates	1,315,616				1,251,530
Investment in subsidiary	3,630,564				3,752,523
Notes receivable	0				0
Prepaid expenses, restricted cash, escrows, and other assets	0				0
Goodwill	0				0
Deferred lease costs, net	0				0
Other assets held for sale, net					0
Total assets	4,946,330				5,004,203
Liabilities:
Debt, net	0				0
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	31,230				580
Advances from affiliates	5,071,521				5,033,266
Deferred income	0				0
Intangible lease liabilities, net	0				0
Interest rate swaps	0				0
Total liabilities	5,102,751				5,033,846
Stockholders’ Equity:
Common stock	1,452				1,455
Additional paid-in capital	3,676,000				3,672,849
Retained/(cumulative distributions in excess of) earnings	(3,833,873)				(3,703,947)
Other comprehensive loss	0				0
Piedmont stockholders’ equity	(156,421)				(29,643)
Noncontrolling interest	0				0
Total stockholders’ equity	(156,421)				(29,643)
Total liabilities and stockholders’ equity	4,946,330				5,004,203
Non-Guarantor Subsidiaries [Member]
Assets:
Land	623,715				621,632
Buildings and improvements, less accumulated depreciation	2,699,430				2,567,706
Intangible lease assets, less accumulated amortization	98,970				83,395
Construction in progress	34,680				20,735
Real estate assets held for sale, net					0
Total real estate assets	3,456,795				3,293,468
Investments in and amounts due from unconsolidated joint ventures	0				0
Cash and cash equivalents	3,168				3,117				$ 2,373	$ 3,562
Tenant and straight-line receivables, net	172,183				149,994
Advances to affiliates	0				0
Investment in subsidiary	181				186
Notes receivable	95,790				23,890
Prepaid expenses, restricted cash, escrows, and other assets	20,575				24,118
Goodwill	0				0
Deferred lease costs, net	289,447				267,102
Other assets held for sale, net					0
Total assets	4,038,139				3,761,875
Liabilities:
Debt, net	503,242				590,743
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	118,712				110,189
Advances from affiliates	2,098,146				1,842,577
Deferred income	23,200				21,365
Intangible lease liabilities, net	48,005				42,853
Interest rate swaps	0				0
Total liabilities	2,791,305				2,607,727
Stockholders’ Equity:
Common stock	0				0
Additional paid-in capital	1,309				1,314
Retained/(cumulative distributions in excess of) earnings	1,243,643				1,151,809
Other comprehensive loss	0				0
Piedmont stockholders’ equity	1,244,952				1,153,123
Noncontrolling interest	1,882				1,025
Total stockholders’ equity	1,246,834				1,154,148
Total liabilities and stockholders’ equity	$ 4,038,139				$ 3,761,875

Guarantor and Non-Guarantor F76

Guarantor and Non-Guarantor Financial Information - Condensed Consolidated Statements of Income (Details) - USD ($) $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014
Revenues:
Rental income													$ 459,890		$ 468,872		$ 454,635
Tenant reimbursements													93,961		113,881		109,548
Property management fee revenue													1,864		2,016		2,069
Total revenues	$ 143,911	$ 138,485	$ 135,307	$ 138,012	$ 139,461	$ 148,815	$ 146,734	$ 149,759	$ 146,711	$ 144,641	$ 138,580	$ 136,320	555,715		584,769		566,252
Expenses:
Property operating costs													218,934		242,022		239,431
Depreciation													127,733		134,503		138,596
Amortization													75,119		60,886		56,579
Impairment loss on real estate assets	0	22,951	10,950	0	0	37,105	6,196	0					33,901	[1]	43,301	[1]	0	[1]
General and administrative													29,244		30,346		23,825
Operating Expenses													484,931		511,058		458,431
Real estate operating income	26,633	2,988	14,791	26,372	28,938	(3,424)	19,983	28,214	28,789	27,199	26,556	25,277	70,784		73,711		107,821
Other income (expense):
Interest expense													(64,860)		(73,998)		(74,446)
Other income/(expense)													(13)		1,565		62
Net recoveries/(loss) from casualty events and litigation settlements													34		(278)		6,992
Equity in income/(loss) of unconsolidated joint ventures													362		553		(350)
Nonoperating Income (Expense)													(64,477)		(72,158)		(67,742)
Income from continuing operations	10,529	(13,065)	(1,553)	10,396	11,164	(21,318)	2,531	9,176	12,567	9,150	9,325	9,037	6,307		1,553		40,079
Discontinued operations:
Operating income													0		84		954
Gain/(loss) on sale of real estate assets													0		(1)		262
Income from discontinued operations	0	1	(1)	0	72	14	(3)	0	(42)	16	882	360	0		83		1,216
Gain on sale of real estate assets	19,652	(57)	73,835	(20)	84,427	14,796	21,520	8,940	(8)	0	878	0	93,410		129,683		870
Net income	30,181	(13,121)	72,281	10,376	95,663	(6,508)	24,048	18,116	12,517	9,166	11,085	9,397	99,717		131,319		42,165
Less: Net loss/(income) applicable to noncontrolling interest													15		(15)		(15)
Net income applicable to Piedmont	$ 30,189	$ (13,107)	$ 72,278	$ 10,372	$ 95,660	$ (6,512)	$ 24,044	$ 18,112	$ 12,514	$ 9,162	$ 11,081	$ 9,393	99,732		131,304		42,150
Eliminations [Member]
Revenues:
Rental income													(2,631)		(2,905)		(5,203)
Tenant reimbursements													(498)		(414)		(534)
Property management fee revenue													(15,033)		(15,785)		(14,447)
Total revenues													(18,162)		(19,104)		(20,184)
Expenses:
Property operating costs													(18,377)		(19,786)		(20,976)
Depreciation													0		0		0
Amortization													0		0		0
Impairment loss on real estate assets													0		0
General and administrative													(35,446)		(35,563)		(27,942)
Operating Expenses													(53,823)		(55,349)		(48,918)
Real estate operating income													35,661		36,245		28,734
Other income (expense):
Interest expense													11,884		11,246		12,534
Other income/(expense)													(11,884)		(11,246)		(12,534)
Net recoveries/(loss) from casualty events and litigation settlements													0		0		0
Equity in income/(loss) of unconsolidated joint ventures													0		0		0
Nonoperating Income (Expense)													0		0		0
Income from continuing operations													35,661		36,245		28,734
Discontinued operations:
Operating income															0		0
Gain/(loss) on sale of real estate assets															0		0
Income from discontinued operations															0		0
Gain on sale of real estate assets													0		0		0
Net income													35,661		36,245		28,734
Less: Net loss/(income) applicable to noncontrolling interest													0		0		0
Net income applicable to Piedmont													35,661		36,245		28,734
Issuer [Member]
Revenues:
Rental income													55,007		67,317		72,843
Tenant reimbursements													14,081		13,340		16,566
Property management fee revenue													0		0		0
Total revenues													69,088		80,657		89,409
Expenses:
Property operating costs													31,967		36,380		42,621
Depreciation													16,657		20,891		23,512
Amortization													3,715		4,598		4,754
Impairment loss on real estate assets													8,259		6,195
General and administrative													28,314		29,645		23,235
Operating Expenses													88,912		97,709		94,122
Real estate operating income													(19,824)		(17,052)		(4,713)
Other income (expense):
Interest expense													(49,108)		(51,704)		(47,355)
Other income/(expense)													9,560		12,600		11,944
Net recoveries/(loss) from casualty events and litigation settlements													0		23		1,322
Equity in income/(loss) of unconsolidated joint ventures													362		553		(350)
Nonoperating Income (Expense)													(39,186)		(38,528)		(34,439)
Income from continuing operations													(59,010)		(55,580)		(39,152)
Discontinued operations:
Operating income															15		913
Gain/(loss) on sale of real estate assets															(1)		70
Income from discontinued operations															14		983
Gain on sale of real estate assets													31,275		45,225		0
Net income													(27,735)		(10,341)		(38,169)
Less: Net loss/(income) applicable to noncontrolling interest													0		0		0
Net income applicable to Piedmont													(27,735)		(10,341)		(38,169)
Guarantor [Member]
Revenues:
Rental income													0		0		0
Tenant reimbursements													0		0		0
Property management fee revenue													0		0		0
Total revenues													0		0		0
Expenses:
Property operating costs													0		0		0
Depreciation													0		0		0
Amortization													0		0		0
Impairment loss on real estate assets													0		0
General and administrative													311		341		300
Operating Expenses													311		341		300
Real estate operating income													(311)		(341)		(300)
Other income (expense):
Interest expense													0		0		0
Other income/(expense)													282		0		0
Net recoveries/(loss) from casualty events and litigation settlements													0		0		1,479
Equity in income/(loss) of unconsolidated joint ventures													0		0		0
Nonoperating Income (Expense)													282		0		1,479
Income from continuing operations													(29)		(341)		1,179
Discontinued operations:
Operating income															0		0
Gain/(loss) on sale of real estate assets															0		0
Income from discontinued operations															0		0
Gain on sale of real estate assets													0		0		0
Net income													(29)		(341)		1,179
Less: Net loss/(income) applicable to noncontrolling interest													0		0		0
Net income applicable to Piedmont													(29)		(341)		1,179
Non-Guarantor Subsidiaries [Member]
Revenues:
Rental income													407,514		404,460		386,995
Tenant reimbursements													80,378		100,955		93,516
Property management fee revenue													16,897		17,801		16,516
Total revenues													504,789		523,216		497,027
Expenses:
Property operating costs													205,344		225,428		217,786
Depreciation													111,076		113,612		115,084
Amortization													71,404		56,288		51,825
Impairment loss on real estate assets													25,642		37,106
General and administrative													36,065		35,923		28,232
Operating Expenses													449,531		468,357		412,927
Real estate operating income													55,258		54,859		84,100
Other income (expense):
Interest expense													(27,636)		(33,540)		(39,625)
Other income/(expense)													2,029		211		652
Net recoveries/(loss) from casualty events and litigation settlements													34		(301)		4,191
Equity in income/(loss) of unconsolidated joint ventures													0		0		0
Nonoperating Income (Expense)													(25,573)		(33,630)		(34,782)
Income from continuing operations													29,685		21,229		49,318
Discontinued operations:
Operating income															69		41
Gain/(loss) on sale of real estate assets															0		192
Income from discontinued operations															69		233
Gain on sale of real estate assets													62,135		84,458		870
Net income													91,820		105,756		50,421
Less: Net loss/(income) applicable to noncontrolling interest													15		(15)		(15)
Net income applicable to Piedmont													$ 91,835		$ 105,741		$ 50,406
[1]	The fair value measurements used in the evaluation of the non-financial assets above are considered to be Level 1 valuations within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the assets by unrelated, third-party purchasers.

Guarantor and Non-Guarantor F77

Guarantor and Non-Guarantor Financial Information - Condensed Consolidated Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	$ 235,809	$ 219,044	$ 217,158
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	(459,896)	(501,444)	(291,459)
Intercompany note receivable	0	0	0
Redemption of noncontrolling interest in unconsolidated variable interest entity	0	(4,000)	0
Net sale proceeds from wholly-owned properties	365,918	848,169	46,232
Net sale proceeds received from unconsolidated joint ventures	0	0	6,017
Investments in unconsolidated joint ventures	0	0	(42)
Deferred lease costs paid	(25,896)	(37,683)	(27,694)
Net cash provided by/(used in) investing activities	(119,874)	305,042	(266,946)
Cash Flows from Financing Activities:
Debt issuance costs paid	(264)	(1,081)	(1,294)
Proceeds from debt	695,000	1,301,858	1,052,527
Repayments of debt	(706,875)	(1,544,301)	(813,702)
Discount due to loan modification	0	0	(1,135)
Intercompany note payable	0	0	0
Costs of issuance of common stock	(342)	(326)	0
Shares withheld to pay tax obligations related to employee stock compensation	(2,344)	(1,710)	(1,275)
Repurchases of common stock as part of announced plan	(7,943)	(158,860)	(54,802)
(Distributions to)/repayments from affiliates	0	0	0
Dividends paid and discount on dividend reinvestments	(91,616)	(126,531)	(125,198)
Net cash provided by/(used in) financing activities	(114,384)	(530,951)	55,121
Net increase/(decrease) in cash and cash equivalents	1,551	(6,865)	5,333
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	35,660	36,245	28,733
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	0	0	0
Intercompany note receivable	71,460	(72,000)	(650)
Redemption of noncontrolling interest in unconsolidated variable interest entity		0
Net sale proceeds from wholly-owned properties	0	0	0
Net sale proceeds received from unconsolidated joint ventures			0
Investments in unconsolidated joint ventures			0
Deferred lease costs paid	0	0	0
Net cash provided by/(used in) investing activities	71,460	(72,000)	(650)
Cash Flows from Financing Activities:
Debt issuance costs paid	0	0	0
Proceeds from debt	0	0	0
Repayments of debt	0	0	0
Discount due to loan modification			0
Intercompany note payable	(71,460)	72,000	650
Costs of issuance of common stock	0	0
Shares withheld to pay tax obligations related to employee stock compensation	0	0
Repurchases of common stock as part of announced plan	0	0	0
(Distributions to)/repayments from affiliates	(35,660)	(36,245)	(28,733)
Dividends paid and discount on dividend reinvestments	0	0	0
Net cash provided by/(used in) financing activities	(107,120)	35,755	(28,083)
Net increase/(decrease) in cash and cash equivalents	0	0	0
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	(26,260)	(27,077)	5,448
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	(5,060)	(12,203)	(23,541)
Intercompany note receivable	440	72,000	650
Redemption of noncontrolling interest in unconsolidated variable interest entity		0
Net sale proceeds from wholly-owned properties	200,220	151,557	29,519
Net sale proceeds received from unconsolidated joint ventures			6,017
Investments in unconsolidated joint ventures			(42)
Deferred lease costs paid	(2,758)	(3,792)	(4,472)
Net cash provided by/(used in) investing activities	192,842	207,562	8,131
Cash Flows from Financing Activities:
Debt issuance costs paid	(264)	(575)	(1,294)
Proceeds from debt	695,000	1,142,577	1,052,527
Repayments of debt	(538,000)	(1,438,000)	(238,000)
Discount due to loan modification			(1,135)
Intercompany note payable	(9,600)	0	0
Costs of issuance of common stock	0	0
Shares withheld to pay tax obligations related to employee stock compensation	0	0	0
Repurchases of common stock as part of announced plan	0	0	0
(Distributions to)/repayments from affiliates	(312,218)	109,544	(820,795)
Dividends paid and discount on dividend reinvestments	0	0	0
Net cash provided by/(used in) financing activities	(165,082)	(186,454)	(8,697)
Net increase/(decrease) in cash and cash equivalents	1,500	(5,969)	4,882
Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	5,214	4,699	4,088
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	0	0	0
Intercompany note receivable	0	0	0
Redemption of noncontrolling interest in unconsolidated variable interest entity		0
Net sale proceeds from wholly-owned properties	0	0	0
Net sale proceeds received from unconsolidated joint ventures			0
Investments in unconsolidated joint ventures			0
Deferred lease costs paid	0	0	0
Net cash provided by/(used in) investing activities	0	0	0
Cash Flows from Financing Activities:
Debt issuance costs paid	0	0	0
Proceeds from debt	0	0	0
Repayments of debt	0	0	0
Discount due to loan modification			0
Intercompany note payable	0	0	0
Costs of issuance of common stock	(342)	(326)
Shares withheld to pay tax obligations related to employee stock compensation	(2,344)	(1,710)	(1,275)
Repurchases of common stock as part of announced plan	(7,943)	(158,860)	(54,802)
(Distributions to)/repayments from affiliates	97,016	281,073	178,812
Dividends paid and discount on dividend reinvestments	(91,601)	(126,516)	(125,183)
Net cash provided by/(used in) financing activities	(5,214)	(6,339)	(2,448)
Net increase/(decrease) in cash and cash equivalents	0	(1,640)	1,640
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided By/(Used In) Operating Activities	221,195	205,177	178,889
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	(454,836)	(489,241)	(267,918)
Intercompany note receivable	(71,900)	0	0
Redemption of noncontrolling interest in unconsolidated variable interest entity		(4,000)
Net sale proceeds from wholly-owned properties	165,698	696,612	16,713
Net sale proceeds received from unconsolidated joint ventures			0
Investments in unconsolidated joint ventures			0
Deferred lease costs paid	(23,138)	(33,891)	(23,222)
Net cash provided by/(used in) investing activities	(384,176)	169,480	(274,427)
Cash Flows from Financing Activities:
Debt issuance costs paid	0	(506)	0
Proceeds from debt	0	159,281	0
Repayments of debt	(168,875)	(106,301)	(575,702)
Discount due to loan modification			0
Intercompany note payable	81,060	(72,000)	(650)
Costs of issuance of common stock	0	0
Shares withheld to pay tax obligations related to employee stock compensation	0	0	0
Repurchases of common stock as part of announced plan	0	0	0
(Distributions to)/repayments from affiliates	250,862	(354,372)	670,716
Dividends paid and discount on dividend reinvestments	(15)	(15)	(15)
Net cash provided by/(used in) financing activities	163,032	(373,913)	94,349
Net increase/(decrease) in cash and cash equivalents	$ 51	$ 744	$ (1,189)

Subsequent events (Details)

Subsequent events (Details) $ / shares in Units, $ in Millions	Feb. 08, 2017$ / shares	Dec. 31, 2016$ / shares	Sep. 30, 2016$ / shares	Jun. 30, 2016$ / shares	Mar. 31, 2016$ / shares	Dec. 31, 2015$ / shares	Sep. 30, 2015$ / shares	Jun. 30, 2015$ / shares	Mar. 31, 2015$ / shares	Dec. 31, 2014$ / shares	Sep. 30, 2014$ / shares	Jun. 30, 2014$ / shares	Mar. 31, 2014$ / shares	Feb. 21, 2017USD ($)ft²story$ / squarefeet
Subsequent Event [Line Items]
Dividends declared (in dollars per share)		$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.21	$ 0.2	$ 0.2	$ 0.2
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.21
Subsequent Event [Member] | Sale of Two Independence Square [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]
Subsequent Event [Line Items]
Number of square feet of office building | ft²														600,000
Number of stories of office building | story														9
Percentage leased														100.00%
Amount of sales price | $														$ 359.6
Sales price per square foot | $ / squarefeet														593

Schedule III - Real Estate an79

Schedule III - Real Estate and Accumulated Depreciation (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2016USD ($)		Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2016USD ($)		Nov. 30, 2016a	Dec. 31, 2015USD ($)
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost, Land						$ 634,231
Initial Cost, Buildings and Improvements						3,803,508
Initial Cost, Total	[1]					4,437,739
Costs Capitalized Subsequent to Acquisition	[2]					362,286
Gross Amount at Which Carried, Land						671,896
Gross Amount at Which Carried, Buildings and Improvements						4,128,129
Gross Amount at Which Carried, Total		$ 4,725,096		$ 5,267,615	$ 5,038,005	4,800,025	[3]		$ 4,725,096
Accumulated Depreciation and Amortization		1,019,663		1,182,556	1,060,885	1,058,704			1,019,663
Tax basis of total assets						4,300,000	[3]		$ 4,200,000
Real Estate:
Balance at the beginning of the year		4,725,096		5,267,615	5,038,005
Additions to/improvements of real estate		422,908		452,106	316,991
Assets disposed		(296,319)		(926,592)	(71,627)
Assets impaired	[4]	(30,898)		(40,169)	0
Write-offs of intangible assets	[5]	(11,896)		(7,768)	(9,723)
Write-offs of fully depreciated/amortized assets		(8,866)		(20,096)	(6,031)
Balance at the end of the year		4,800,025	[3]	4,725,096	5,267,615
Accumulated Depreciation and Amortization:
Balance at the beginning of the year		1,019,663		1,182,556	1,060,885
Depreciation and amortization expense		155,274		155,009	156,808
Assets disposed		(95,471)		(290,038)	(19,383)
Write-offs of intangible assets	[5]	(11,896)		(7,768)	(9,723)
Write-offs of fully depreciated/amortized assets		(8,866)		(20,096)	(6,031)
Balance at the end of the year		1,058,704		$ 1,019,663	$ 1,182,556
750 W. JOHN CARPENTER FREEWAY [Member]
Real Estate and Accumulated Depreciation [Line Items]
Number of acres of adjacent land purchased | a								3.5
Purchase price of adjoining, developable land		$ 1,000
1225 Eye Street N.W. Associates, LLC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Piedmont’s % Ownership of Entity		49.50%
1201 Eye Street N.W. Associates, LLC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Piedmont’s % Ownership of Entity		49.50%
1225 Equity LLC [Member] | 1225 Eye Street N.W. Associates, LLC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Piedmont’s % Ownership of Entity		49.50%
1201 Equity LLC [Member] | 1201 Eye Street N.W. Associates, LLC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Piedmont’s % Ownership of Entity		49.50%
Building [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life		40 years
Wholly Owned Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost, Land						632,277
Initial Cost, Buildings and Improvements						3,792,292
Initial Cost, Total	[1]					4,424,569
Costs Capitalized Subsequent to Acquisition	[2]					360,848
Gross Amount at Which Carried, Land						669,848
Gross Amount at Which Carried, Buildings and Improvements						4,115,569
Gross Amount at Which Carried, Total	[3]	$ 4,785,417				4,785,417
Accumulated Depreciation and Amortization		1,053,725				1,053,725
Real Estate:
Balance at the end of the year	[3]	4,785,417
Accumulated Depreciation and Amortization:
Balance at the end of the year		1,053,725
Partially Owned Properties [Member]
Real Estate and Accumulated Depreciation [Line Items]
Initial Cost, Land						1,954
Initial Cost, Buildings and Improvements						11,216
Initial Cost, Total	[1]					13,170
Costs Capitalized Subsequent to Acquisition	[2]					1,438
Gross Amount at Which Carried, Land						2,048
Gross Amount at Which Carried, Buildings and Improvements						12,560
Gross Amount at Which Carried, Total	[3]	14,608				14,608
Accumulated Depreciation and Amortization		4,979				$ 4,979
Real Estate:
Balance at the end of the year	[3]	14,608
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 4,979
Minimum [Member] | Building Improvements [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life		5 years
Minimum [Member] | Land Improvements [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life		20 years
Maximum [Member] | Building Improvements [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life		25 years
Maximum [Member] | Land Improvements [Member]
Real Estate and Accumulated Depreciation [Line Items]
Useful life		25 years
1430 ENCLAVE PARKWAY [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 7,100
Initial Cost, Buildings and Improvements						37,915
Initial Cost, Total	[1]					45,015
Costs Capitalized Subsequent to Acquisition	[2]					2,050
Gross Amount at Which Carried, Land						5,506
Gross Amount at Which Carried, Buildings and Improvements						41,559
Gross Amount at Which Carried, Total	[3]	$ 47,065				47,065
Accumulated Depreciation and Amortization		18,517				$ 18,517
Real Estate:
Balance at the end of the year	[3]	47,065
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 18,517
1430 ENCLAVE PARKWAY [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
1430 ENCLAVE PARKWAY [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
CRESCENT RIDGE II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 7,700
Initial Cost, Buildings and Improvements						45,154
Initial Cost, Total	[1]					52,854
Costs Capitalized Subsequent to Acquisition	[2]					7,651
Gross Amount at Which Carried, Land						8,021
Gross Amount at Which Carried, Buildings and Improvements						52,484
Gross Amount at Which Carried, Total	[3]	$ 60,505				60,505
Accumulated Depreciation and Amortization		22,236				$ 22,236
Real Estate:
Balance at the end of the year	[3]	60,505
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 22,236
CRESCENT RIDGE II [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
CRESCENT RIDGE II [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
1200 CROWN COLONY DRIVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 11,042
Initial Cost, Buildings and Improvements						40,666
Initial Cost, Total	[1]					51,708
Costs Capitalized Subsequent to Acquisition	[2]					3,506
Gross Amount at Which Carried, Land						11,042
Gross Amount at Which Carried, Buildings and Improvements						44,172
Gross Amount at Which Carried, Total	[3]	$ 55,214				55,214
Accumulated Depreciation and Amortization		18,445				$ 18,445
Real Estate:
Balance at the end of the year	[3]	55,214
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 18,445
1200 CROWN COLONY DRIVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
1200 CROWN COLONY DRIVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
5601 HIATUS ROAD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 3,642
Initial Cost, Buildings and Improvements						10,404
Initial Cost, Total	[1]					14,046
Costs Capitalized Subsequent to Acquisition	[2]					1,721
Gross Amount at Which Carried, Land						3,642
Gross Amount at Which Carried, Buildings and Improvements						12,125
Gross Amount at Which Carried, Total	[3]	$ 15,767				15,767
Accumulated Depreciation and Amortization		5,691				$ 5,691
Real Estate:
Balance at the end of the year	[3]	15,767
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 5,691
5601 HIATUS ROAD [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
5601 HIATUS ROAD [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
WINDY POINT I [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,537
Initial Cost, Buildings and Improvements						31,847
Initial Cost, Total	[1]					36,384
Costs Capitalized Subsequent to Acquisition	[2]					2,071
Gross Amount at Which Carried, Land						4,537
Gross Amount at Which Carried, Buildings and Improvements						33,918
Gross Amount at Which Carried, Total	[3]	$ 38,455				38,455
Accumulated Depreciation and Amortization		13,116				$ 13,116
Real Estate:
Balance at the end of the year	[3]	38,455
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 13,116
WINDY POINT I [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
WINDY POINT I [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
WINDY POINT II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 3,746
Initial Cost, Buildings and Improvements						55,026
Initial Cost, Total	[1]					58,772
Costs Capitalized Subsequent to Acquisition	[2]					16,696
Gross Amount at Which Carried, Land						3,746
Gross Amount at Which Carried, Buildings and Improvements						71,722
Gross Amount at Which Carried, Total	[3]	$ 75,468				75,468
Accumulated Depreciation and Amortization		26,654				$ 26,654
Real Estate:
Balance at the end of the year	[3]	75,468
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 26,654
WINDY POINT II [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
WINDY POINT II [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
SARASOTA COMMERCE CENTER II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 1,767
Initial Cost, Buildings and Improvements						20,533
Initial Cost, Total	[1]					22,300
Costs Capitalized Subsequent to Acquisition	[2]					2,730
Gross Amount at Which Carried, Land						2,203
Gross Amount at Which Carried, Buildings and Improvements						22,827
Gross Amount at Which Carried, Total	[3]	$ 25,030				25,030
Accumulated Depreciation and Amortization		9,652				$ 9,652
Real Estate:
Balance at the end of the year	[3]	25,030
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 9,652
SARASOTA COMMERCE CENTER II [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
SARASOTA COMMERCE CENTER II [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
2001 NW 64TH STREET [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	[7]					100.00%
Initial Cost, Land	[7]					$ 0
Initial Cost, Buildings and Improvements	[7]					7,172
Initial Cost, Total	[1],[7]					7,172
Costs Capitalized Subsequent to Acquisition	[2],[7]					966
Gross Amount at Which Carried, Land	[7]					0
Gross Amount at Which Carried, Buildings and Improvements	[7]					8,138
Gross Amount at Which Carried, Total	[3],[7]	$ 8,138				8,138
Accumulated Depreciation and Amortization	[7]	3,428				$ 3,428
Real Estate:
Balance at the end of the year	[3],[7]	8,138
Accumulated Depreciation and Amortization:
Balance at the end of the year	[7]	$ 3,428
2001 NW 64TH STREET [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[7]	0 years
2001 NW 64TH STREET [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[7]	40 years
90 CENTRAL STREET [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 3,642
Initial Cost, Buildings and Improvements						29,497
Initial Cost, Total	[1]					33,139
Costs Capitalized Subsequent to Acquisition	[2]					3,070
Gross Amount at Which Carried, Land						3,642
Gross Amount at Which Carried, Buildings and Improvements						32,567
Gross Amount at Which Carried, Total	[3]	$ 36,209				36,209
Accumulated Depreciation and Amortization		13,092				$ 13,092
Real Estate:
Balance at the end of the year	[3]	36,209
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 13,092
90 CENTRAL STREET [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
90 CENTRAL STREET [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
DESERT CANYON 300 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 2,602
Initial Cost, Buildings and Improvements						24,333
Initial Cost, Total	[1]					26,935
Costs Capitalized Subsequent to Acquisition	[2]					45
Gross Amount at Which Carried, Land						2,602
Gross Amount at Which Carried, Buildings and Improvements						24,378
Gross Amount at Which Carried, Total	[3]	$ 26,980				26,980
Accumulated Depreciation and Amortization		9,289				$ 9,289
Real Estate:
Balance at the end of the year	[3]	26,980
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 9,289
DESERT CANYON 300 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
DESERT CANYON 300 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
6031 CONNECTION DRIVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 3,157
Initial Cost, Buildings and Improvements						43,656
Initial Cost, Total	[1]					46,813
Costs Capitalized Subsequent to Acquisition	[2]					4,305
Gross Amount at Which Carried, Land						3,157
Gross Amount at Which Carried, Buildings and Improvements						47,961
Gross Amount at Which Carried, Total	[3]	$ 51,118				51,118
Accumulated Depreciation and Amortization		18,841				$ 18,841
Real Estate:
Balance at the end of the year	[3]	51,118
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 18,841
6031 CONNECTION DRIVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
6031 CONNECTION DRIVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
6021 CONNECTION DRIVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 3,157
Initial Cost, Buildings and Improvements						42,662
Initial Cost, Total	[1]					45,819
Costs Capitalized Subsequent to Acquisition	[2]					10,541
Gross Amount at Which Carried, Land						3,157
Gross Amount at Which Carried, Buildings and Improvements						53,203
Gross Amount at Which Carried, Total	[3]	$ 56,360				56,360
Accumulated Depreciation and Amortization		18,207				$ 18,207
Real Estate:
Balance at the end of the year	[3]	56,360
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 18,207
6021 CONNECTION DRIVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
6021 CONNECTION DRIVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
6011 CONNECTION DRIVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 3,157
Initial Cost, Buildings and Improvements						29,034
Initial Cost, Total	[1]					32,191
Costs Capitalized Subsequent to Acquisition	[2]					2,597
Gross Amount at Which Carried, Land						3,157
Gross Amount at Which Carried, Buildings and Improvements						31,631
Gross Amount at Which Carried, Total	[3]	$ 34,788				34,788
Accumulated Depreciation and Amortization		13,167				$ 13,167
Real Estate:
Balance at the end of the year	[3]	34,788
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 13,167
6011 CONNECTION DRIVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
6011 CONNECTION DRIVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
TWO INDEPENDENCE SQUARE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 52,711
Initial Cost, Buildings and Improvements						202,702
Initial Cost, Total	[1]					255,413
Costs Capitalized Subsequent to Acquisition	[2]					58,844
Gross Amount at Which Carried, Land						52,711
Gross Amount at Which Carried, Buildings and Improvements						261,546
Gross Amount at Which Carried, Total	[3]	$ 314,257				314,257
Accumulated Depreciation and Amortization		88,319				$ 88,319
Real Estate:
Balance at the end of the year	[3]	314,257
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 88,319
TWO INDEPENDENCE SQUARE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
TWO INDEPENDENCE SQUARE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
ONE INDEPENDENCE SQUARE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 29,765
Initial Cost, Buildings and Improvements						104,814
Initial Cost, Total	[1]					134,579
Costs Capitalized Subsequent to Acquisition	[2]					24,250
Gross Amount at Which Carried, Land						30,562
Gross Amount at Which Carried, Buildings and Improvements						128,267
Gross Amount at Which Carried, Total	[3]	$ 158,829				158,829
Accumulated Depreciation and Amortization		40,467				$ 40,467
Real Estate:
Balance at the end of the year	[3]	158,829
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 40,467
ONE INDEPENDENCE SQUARE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
ONE INDEPENDENCE SQUARE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
2120 WEST END AVENUE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,908
Initial Cost, Buildings and Improvements						59,011
Initial Cost, Total	[1]					63,919
Costs Capitalized Subsequent to Acquisition	[2]					6,671
Gross Amount at Which Carried, Land						5,101
Gross Amount at Which Carried, Buildings and Improvements						65,489
Gross Amount at Which Carried, Total	[3]	$ 70,590				70,590
Accumulated Depreciation and Amortization		25,014				$ 25,014
Real Estate:
Balance at the end of the year	[3]	70,590
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 25,014
2120 WEST END AVENUE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
2120 WEST END AVENUE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
800 NORTH BRAND BOULEVARD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 23,605
Initial Cost, Buildings and Improvements						136,284
Initial Cost, Total	[1]					159,889
Costs Capitalized Subsequent to Acquisition	[2]					12,937
Gross Amount at Which Carried, Land						23,607
Gross Amount at Which Carried, Buildings and Improvements						149,219
Gross Amount at Which Carried, Total	[3]	$ 172,826				172,826
Accumulated Depreciation and Amortization		52,172				$ 52,172
Real Estate:
Balance at the end of the year	[3]	172,826
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 52,172
800 NORTH BRAND BOULEVARD [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
800 NORTH BRAND BOULEVARD [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
US BANCORP CENTER [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 11,138
Initial Cost, Buildings and Improvements						175,629
Initial Cost, Total	[1]					186,767
Costs Capitalized Subsequent to Acquisition	[2]					17,422
Gross Amount at Which Carried, Land						11,138
Gross Amount at Which Carried, Buildings and Improvements						193,051
Gross Amount at Which Carried, Total	[3]	$ 204,189				204,189
Accumulated Depreciation and Amortization		65,628				$ 65,628
Real Estate:
Balance at the end of the year	[3]	204,189
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 65,628
US BANCORP CENTER [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
US BANCORP CENTER [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
AUBURN HILLS CORPORATE CENTER [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 1,978
Initial Cost, Buildings and Improvements						16,570
Initial Cost, Total	[1]					18,548
Costs Capitalized Subsequent to Acquisition	[2]					(8,081)
Gross Amount at Which Carried, Land						1,591
Gross Amount at Which Carried, Buildings and Improvements						8,876
Gross Amount at Which Carried, Total	[3]	$ 10,467				10,467
Accumulated Depreciation and Amortization		4,292				$ 4,292
Real Estate:
Balance at the end of the year	[3]	10,467
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 4,292
AUBURN HILLS CORPORATE CENTER [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
AUBURN HILLS CORPORATE CENTER [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
GLENRIDGE HIGHLANDS TWO [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 6,662
Initial Cost, Buildings and Improvements						69,031
Initial Cost, Total	[1]					75,693
Costs Capitalized Subsequent to Acquisition	[2]					(17,857)
Gross Amount at Which Carried, Land						6,662
Gross Amount at Which Carried, Buildings and Improvements						51,174
Gross Amount at Which Carried, Total	[3]	$ 57,836				57,836
Accumulated Depreciation and Amortization		19,919				$ 19,919
Real Estate:
Balance at the end of the year	[3]	57,836
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 19,919
GLENRIDGE HIGHLANDS TWO [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
GLENRIDGE HIGHLANDS TWO [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
200 BRIDGEWATER CROSSING [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 8,182
Initial Cost, Buildings and Improvements						84,160
Initial Cost, Total	[1]					92,342
Costs Capitalized Subsequent to Acquisition	[2]					(11,740)
Gross Amount at Which Carried, Land						8,328
Gross Amount at Which Carried, Buildings and Improvements						72,274
Gross Amount at Which Carried, Total	[3]	$ 80,602				80,602
Accumulated Depreciation and Amortization		25,815				$ 25,815
Real Estate:
Balance at the end of the year	[3]	80,602
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 25,815
200 BRIDGEWATER CROSSING [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
200 BRIDGEWATER CROSSING [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
400 VIRGINIA AVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 22,146
Initial Cost, Buildings and Improvements						49,740
Initial Cost, Total	[1]					71,886
Costs Capitalized Subsequent to Acquisition	[2]					(792)
Gross Amount at Which Carried, Land						22,146
Gross Amount at Which Carried, Buildings and Improvements						48,948
Gross Amount at Which Carried, Total	[3]	$ 71,094				71,094
Accumulated Depreciation and Amortization		17,279				$ 17,279
Real Estate:
Balance at the end of the year	[3]	71,094
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 17,279
400 VIRGINIA AVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
400 VIRGINIA AVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
4250 NORTH FAIRFAX DRIVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 13,636
Initial Cost, Buildings and Improvements						70,918
Initial Cost, Total	[1]					84,554
Costs Capitalized Subsequent to Acquisition	[2]					4,240
Gross Amount at Which Carried, Land						13,636
Gross Amount at Which Carried, Buildings and Improvements						75,158
Gross Amount at Which Carried, Total	[3]	$ 88,794				88,794
Accumulated Depreciation and Amortization		24,989				$ 24,989
Real Estate:
Balance at the end of the year	[3]	88,794
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 24,989
4250 NORTH FAIRFAX DRIVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
4250 NORTH FAIRFAX DRIVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
1225 EYE STREET [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	[8]					49.50%
Encumbrances	[8]					$ 57,600
Initial Cost, Land	[8]					21,959
Initial Cost, Buildings and Improvements	[8]					47,602
Initial Cost, Total	[1],[8]					69,561
Costs Capitalized Subsequent to Acquisition	[2],[8]					7,565
Gross Amount at Which Carried, Land	[8]					21,959
Gross Amount at Which Carried, Buildings and Improvements	[8]					55,167
Gross Amount at Which Carried, Total	[3],[8]	$ 77,126				77,126
Accumulated Depreciation and Amortization	[8]	17,014				$ 17,014
Real Estate:
Balance at the end of the year	[3],[8]	77,126
Accumulated Depreciation and Amortization:
Balance at the end of the year	[8]	$ 17,014
1225 EYE STREET [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[8]	0 years
1225 EYE STREET [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[8]	40 years
1201 EYE STREET [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	[9]					49.50%
Encumbrances	[9]					$ 82,400
Initial Cost, Land	[9]					31,985
Initial Cost, Buildings and Improvements	[9]					63,139
Initial Cost, Total	[1],[9]					95,124
Costs Capitalized Subsequent to Acquisition	[2],[9]					(55)
Gross Amount at Which Carried, Land	[9]					31,984
Gross Amount at Which Carried, Buildings and Improvements	[9]					63,085
Gross Amount at Which Carried, Total	[3],[9]	$ 95,069				95,069
Accumulated Depreciation and Amortization	[9]	20,043				$ 20,043
Real Estate:
Balance at the end of the year	[3],[9]	95,069
Accumulated Depreciation and Amortization:
Balance at the end of the year	[9]	$ 20,043
1201 EYE STREET [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[9]	0 years
1201 EYE STREET [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[9]	40 years
1901 MARKET STREET [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Encumbrances						$ 160,000
Initial Cost, Land						13,584
Initial Cost, Buildings and Improvements						166,683
Initial Cost, Total	[1]					180,267
Costs Capitalized Subsequent to Acquisition	[2]					53,684
Gross Amount at Which Carried, Land						20,829
Gross Amount at Which Carried, Buildings and Improvements						213,122
Gross Amount at Which Carried, Total	[3]	$ 233,951				233,951
Accumulated Depreciation and Amortization		71,421				$ 71,421
Real Estate:
Balance at the end of the year	[3]	233,951
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 71,421
1901 MARKET STREET [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
1901 MARKET STREET [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
60 BROAD STREET [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 32,522
Initial Cost, Buildings and Improvements						168,986
Initial Cost, Total	[1]					201,508
Costs Capitalized Subsequent to Acquisition	[2]					12,390
Gross Amount at Which Carried, Land						60,708
Gross Amount at Which Carried, Buildings and Improvements						153,190
Gross Amount at Which Carried, Total	[3]	$ 213,898				213,898
Accumulated Depreciation and Amortization		51,381				$ 51,381
Real Estate:
Balance at the end of the year	[3]	213,898
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 51,381
60 BROAD STREET [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
60 BROAD STREET [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
1414 MASSACHUSETTS AVENUE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,210
Initial Cost, Buildings and Improvements						35,821
Initial Cost, Total	[1]					40,031
Costs Capitalized Subsequent to Acquisition	[2]					(284)
Gross Amount at Which Carried, Land						4,365
Gross Amount at Which Carried, Buildings and Improvements						35,382
Gross Amount at Which Carried, Total	[3]	$ 39,747				39,747
Accumulated Depreciation and Amortization		16,045				$ 16,045
Real Estate:
Balance at the end of the year	[3]	39,747
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 16,045
1414 MASSACHUSETTS AVENUE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
1414 MASSACHUSETTS AVENUE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
ONE BRATTLE SQUARE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 6,974
Initial Cost, Buildings and Improvements						64,940
Initial Cost, Total	[1]					71,914
Costs Capitalized Subsequent to Acquisition	[2]					(2,976)
Gross Amount at Which Carried, Land						7,113
Gross Amount at Which Carried, Buildings and Improvements						61,825
Gross Amount at Which Carried, Total	[3]	$ 68,938				68,938
Accumulated Depreciation and Amortization		34,237				$ 34,237
Real Estate:
Balance at the end of the year	[3]	68,938
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 34,237
ONE BRATTLE SQUARE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
ONE BRATTLE SQUARE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
600 CORPORATE DRIVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 3,934
Initial Cost, Buildings and Improvements						0
Initial Cost, Total	[1]					3,934
Costs Capitalized Subsequent to Acquisition	[2]					16,281
Gross Amount at Which Carried, Land						3,934
Gross Amount at Which Carried, Buildings and Improvements						16,281
Gross Amount at Which Carried, Total	[3]	$ 20,215				20,215
Accumulated Depreciation and Amortization		6,969				$ 6,969
Real Estate:
Balance at the end of the year	[3]	20,215
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 6,969
600 CORPORATE DRIVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
600 CORPORATE DRIVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
1075 WEST ENTRANCE DRIVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 5,200
Initial Cost, Buildings and Improvements						22,957
Initial Cost, Total	[1]					28,157
Costs Capitalized Subsequent to Acquisition	[2]					(313)
Gross Amount at Which Carried, Land						5,207
Gross Amount at Which Carried, Buildings and Improvements						22,637
Gross Amount at Which Carried, Total	[3]	$ 27,844				27,844
Accumulated Depreciation and Amortization		8,128				$ 8,128
Real Estate:
Balance at the end of the year	[3]	27,844
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 8,128
1075 WEST ENTRANCE DRIVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
1075 WEST ENTRANCE DRIVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
3100 CLARENDON BOULEVARD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 11,700
Initial Cost, Buildings and Improvements						69,705
Initial Cost, Total	[1]					81,405
Costs Capitalized Subsequent to Acquisition	[2]					38,680
Gross Amount at Which Carried, Land						11,791
Gross Amount at Which Carried, Buildings and Improvements						108,294
Gross Amount at Which Carried, Total	[3]	$ 120,085				120,085
Accumulated Depreciation and Amortization		21,673				$ 21,673
Real Estate:
Balance at the end of the year	[3]	120,085
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 21,673
3100 CLARENDON BOULEVARD [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
3100 CLARENDON BOULEVARD [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
400 BRIDGEWATER CROSSING [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 10,400
Initial Cost, Buildings and Improvements						71,052
Initial Cost, Total	[1]					81,452
Costs Capitalized Subsequent to Acquisition	[2]					(15,626)
Gross Amount at Which Carried, Land						10,400
Gross Amount at Which Carried, Buildings and Improvements						55,426
Gross Amount at Which Carried, Total	[3]	$ 65,826				65,826
Accumulated Depreciation and Amortization		16,329				$ 16,329
Real Estate:
Balance at the end of the year	[3]	65,826
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 16,329
400 BRIDGEWATER CROSSING [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
400 BRIDGEWATER CROSSING [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
LAS COLINAS CORPORATE CENTER I [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 3,912
Initial Cost, Buildings and Improvements						18,830
Initial Cost, Total	[1]					22,742
Costs Capitalized Subsequent to Acquisition	[2]					(3,667)
Gross Amount at Which Carried, Land						2,543
Gross Amount at Which Carried, Buildings and Improvements						16,532
Gross Amount at Which Carried, Total	[3]	$ 19,075				19,075
Accumulated Depreciation and Amortization		5,065				$ 5,065
Real Estate:
Balance at the end of the year	[3]	19,075
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 5,065
LAS COLINAS CORPORATE CENTER I [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
LAS COLINAS CORPORATE CENTER I [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
LAS COLINAS CORPORATE CENTER II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,496
Initial Cost, Buildings and Improvements						29,881
Initial Cost, Total	[1]					34,377
Costs Capitalized Subsequent to Acquisition	[2]					(3,624)
Gross Amount at Which Carried, Land						2,543
Gross Amount at Which Carried, Buildings and Improvements						28,210
Gross Amount at Which Carried, Total	[3]	$ 30,753				30,753
Accumulated Depreciation and Amortization		8,536				$ 8,536
Real Estate:
Balance at the end of the year	[3]	30,753
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 8,536
LAS COLINAS CORPORATE CENTER II [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
LAS COLINAS CORPORATE CENTER II [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
TWO PIERCE PLACE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,370
Initial Cost, Buildings and Improvements						70,632
Initial Cost, Total	[1]					75,002
Costs Capitalized Subsequent to Acquisition	[2]					10,640
Gross Amount at Which Carried, Land						8,156
Gross Amount at Which Carried, Buildings and Improvements						77,486
Gross Amount at Which Carried, Total	[3]	$ 85,642				85,642
Accumulated Depreciation and Amortization		28,680				$ 28,680
Real Estate:
Balance at the end of the year	[3]	85,642
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 28,680
TWO PIERCE PLACE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
TWO PIERCE PLACE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
2300 CABOT DRIVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,390
Initial Cost, Buildings and Improvements						19,549
Initial Cost, Total	[1]					23,939
Costs Capitalized Subsequent to Acquisition	[2]					(4,073)
Gross Amount at Which Carried, Land						4,390
Gross Amount at Which Carried, Buildings and Improvements						15,476
Gross Amount at Which Carried, Total	[3]	$ 19,866				19,866
Accumulated Depreciation and Amortization		4,054				$ 4,054
Real Estate:
Balance at the end of the year	[3]	19,866
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 4,054
2300 CABOT DRIVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
2300 CABOT DRIVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
PIEDMONT POINTE I [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 11,200
Initial Cost, Buildings and Improvements						58,606
Initial Cost, Total	[1]					69,806
Costs Capitalized Subsequent to Acquisition	[2]					7,371
Gross Amount at Which Carried, Land						11,200
Gross Amount at Which Carried, Buildings and Improvements						65,977
Gross Amount at Which Carried, Total	[3]	$ 77,177				77,177
Accumulated Depreciation and Amortization		17,043				$ 17,043
Real Estate:
Balance at the end of the year	[3]	77,177
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 17,043
PIEDMONT POINTE I [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
PIEDMONT POINTE I [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
PIEDMONT POINTE II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 13,300
Initial Cost, Buildings and Improvements						70,618
Initial Cost, Total	[1]					83,918
Costs Capitalized Subsequent to Acquisition	[2]					8,115
Gross Amount at Which Carried, Land						13,300
Gross Amount at Which Carried, Buildings and Improvements						78,733
Gross Amount at Which Carried, Total	[3]	$ 92,033				92,033
Accumulated Depreciation and Amortization		18,682				$ 18,682
Real Estate:
Balance at the end of the year	[3]	92,033
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 18,682
PIEDMONT POINTE II [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
PIEDMONT POINTE II [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
SUWANEE GATEWAY ONE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 1,000
Initial Cost, Buildings and Improvements						6,875
Initial Cost, Total	[1]					7,875
Costs Capitalized Subsequent to Acquisition	[2]					3,159
Gross Amount at Which Carried, Land						2,401
Gross Amount at Which Carried, Buildings and Improvements						8,633
Gross Amount at Which Carried, Total	[3]	$ 11,034				11,034
Accumulated Depreciation and Amortization		1,533				$ 1,533
Real Estate:
Balance at the end of the year	[3]	11,034
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 1,533
SUWANEE GATEWAY ONE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
SUWANEE GATEWAY ONE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
ONE MERIDIAN CROSSINGS [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 2,919
Initial Cost, Buildings and Improvements						24,398
Initial Cost, Total	[1]					27,317
Costs Capitalized Subsequent to Acquisition	[2]					318
Gross Amount at Which Carried, Land						2,919
Gross Amount at Which Carried, Buildings and Improvements						24,716
Gross Amount at Which Carried, Total	[3]	$ 27,635				27,635
Accumulated Depreciation and Amortization		4,340				$ 4,340
Real Estate:
Balance at the end of the year	[3]	27,635
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 4,340
ONE MERIDIAN CROSSINGS [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
ONE MERIDIAN CROSSINGS [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
TWO MERIDIAN CROSSINGS [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 2,661
Initial Cost, Buildings and Improvements						25,742
Initial Cost, Total	[1]					28,403
Costs Capitalized Subsequent to Acquisition	[2]					590
Gross Amount at Which Carried, Land						2,661
Gross Amount at Which Carried, Buildings and Improvements						26,332
Gross Amount at Which Carried, Total	[3]	$ 28,993				28,993
Accumulated Depreciation and Amortization		4,592				$ 4,592
Real Estate:
Balance at the end of the year	[3]	28,993
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 4,592
TWO MERIDIAN CROSSINGS [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
TWO MERIDIAN CROSSINGS [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
500 WEST MONROE STREET [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 36,990
Initial Cost, Buildings and Improvements						185,113
Initial Cost, Total	[1]					222,103
Costs Capitalized Subsequent to Acquisition	[2]					42,561
Gross Amount at Which Carried, Land						36,990
Gross Amount at Which Carried, Buildings and Improvements						227,674
Gross Amount at Which Carried, Total	[3]	$ 264,664				264,664
Accumulated Depreciation and Amortization		35,293				$ 35,293
Real Estate:
Balance at the end of the year	[3]	264,664
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 35,293
500 WEST MONROE STREET [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
500 WEST MONROE STREET [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
THE DUPREE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,080
Initial Cost, Buildings and Improvements						14,310
Initial Cost, Total	[1]					18,390
Costs Capitalized Subsequent to Acquisition	[2]					877
Gross Amount at Which Carried, Land						4,080
Gross Amount at Which Carried, Buildings and Improvements						15,187
Gross Amount at Which Carried, Total	[3]	$ 19,267				19,267
Accumulated Depreciation and Amortization		3,814				$ 3,814
Real Estate:
Balance at the end of the year	[3]	19,267
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 3,814
THE DUPREE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
THE DUPREE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
THE MEDICI [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 1,780
Initial Cost, Buildings and Improvements						11,510
Initial Cost, Total	[1]					13,290
Costs Capitalized Subsequent to Acquisition	[2]					4,988
Gross Amount at Which Carried, Land						1,780
Gross Amount at Which Carried, Buildings and Improvements						16,498
Gross Amount at Which Carried, Total	[3]	$ 18,278				18,278
Accumulated Depreciation and Amortization		2,873				$ 2,873
Real Estate:
Balance at the end of the year	[3]	18,278
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 2,873
THE MEDICI [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
THE MEDICI [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
225 PRESIDENTIAL WAY [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 3,626
Initial Cost, Buildings and Improvements						36,916
Initial Cost, Total	[1]					40,542
Costs Capitalized Subsequent to Acquisition	[2]					(764)
Gross Amount at Which Carried, Land						3,612
Gross Amount at Which Carried, Buildings and Improvements						36,166
Gross Amount at Which Carried, Total	[3]	$ 39,778				39,778
Accumulated Depreciation and Amortization		8,150				$ 8,150
Real Estate:
Balance at the end of the year	[3]	39,778
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 8,150
225 PRESIDENTIAL WAY [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
225 PRESIDENTIAL WAY [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
235 PRESIDENTIAL WAY [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,154
Initial Cost, Buildings and Improvements						44,048
Initial Cost, Total	[1]					48,202
Costs Capitalized Subsequent to Acquisition	[2]					(911)
Gross Amount at Which Carried, Land						4,138
Gross Amount at Which Carried, Buildings and Improvements						43,153
Gross Amount at Which Carried, Total	[3]	$ 47,291				47,291
Accumulated Depreciation and Amortization		9,686				$ 9,686
Real Estate:
Balance at the end of the year	[3]	47,291
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 9,686
235 PRESIDENTIAL WAY [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
235 PRESIDENTIAL WAY [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
400 TOWNPARK [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 2,570
Initial Cost, Buildings and Improvements						20,555
Initial Cost, Total	[1]					23,125
Costs Capitalized Subsequent to Acquisition	[2]					3,555
Gross Amount at Which Carried, Land						2,570
Gross Amount at Which Carried, Buildings and Improvements						24,110
Gross Amount at Which Carried, Total	[3]	$ 26,680				26,680
Accumulated Depreciation and Amortization		4,107				$ 4,107
Real Estate:
Balance at the end of the year	[3]	26,680
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 4,107
400 TOWNPARK [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
400 TOWNPARK [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
ARLINGTON GATEWAY [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 36,930
Initial Cost, Buildings and Improvements						129,070
Initial Cost, Total	[1]					166,000
Costs Capitalized Subsequent to Acquisition	[2]					1,384
Gross Amount at Which Carried, Land						36,930
Gross Amount at Which Carried, Buildings and Improvements						130,454
Gross Amount at Which Carried, Total	[3]	$ 167,384				167,384
Accumulated Depreciation and Amortization		19,186				$ 19,186
Real Estate:
Balance at the end of the year	[3]	167,384
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 19,186
ARLINGTON GATEWAY [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
ARLINGTON GATEWAY [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
5 & 15 WAYSIDE ROAD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 7,190
Initial Cost, Buildings and Improvements						55,445
Initial Cost, Total	[1]					62,635
Costs Capitalized Subsequent to Acquisition	[2]					1,536
Gross Amount at Which Carried, Land						7,190
Gross Amount at Which Carried, Buildings and Improvements						56,981
Gross Amount at Which Carried, Total	[3]	$ 64,171				64,171
Accumulated Depreciation and Amortization		7,917				$ 7,917
Real Estate:
Balance at the end of the year	[3]	64,171
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 7,917
5 & 15 WAYSIDE ROAD [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
5 & 15 WAYSIDE ROAD [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
5301 MARYLAND WAY [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 5,740
Initial Cost, Buildings and Improvements						9,717
Initial Cost, Total	[1]					15,457
Costs Capitalized Subsequent to Acquisition	[2]					(1,768)
Gross Amount at Which Carried, Land						5,740
Gross Amount at Which Carried, Buildings and Improvements						7,949
Gross Amount at Which Carried, Total	[3]	$ 13,689				13,689
Accumulated Depreciation and Amortization		581				$ 581
Real Estate:
Balance at the end of the year	[3]	13,689
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 581
5301 MARYLAND WAY [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
5301 MARYLAND WAY [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
6565 MACARTHUR BLVD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,820
Initial Cost, Buildings and Improvements						37,767
Initial Cost, Total	[1]					42,587
Costs Capitalized Subsequent to Acquisition	[2]					512
Gross Amount at Which Carried, Land						4,820
Gross Amount at Which Carried, Buildings and Improvements						38,279
Gross Amount at Which Carried, Total	[3]	$ 43,099				43,099
Accumulated Depreciation and Amortization		5,115				$ 5,115
Real Estate:
Balance at the end of the year	[3]	43,099
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 5,115
6565 MACARTHUR BLVD [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
6565 MACARTHUR BLVD [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
ONE LINCOLN PARK [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 6,640
Initial Cost, Buildings and Improvements						44,810
Initial Cost, Total	[1]					51,450
Costs Capitalized Subsequent to Acquisition	[2]					1,383
Gross Amount at Which Carried, Land						6,640
Gross Amount at Which Carried, Buildings and Improvements						46,193
Gross Amount at Which Carried, Total	[3]	$ 52,833				52,833
Accumulated Depreciation and Amortization		5,121				$ 5,121
Real Estate:
Balance at the end of the year	[3]	52,833
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 5,121
ONE LINCOLN PARK [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
ONE LINCOLN PARK [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
161 CORPORATE CENTER [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 2,020
Initial Cost, Buildings and Improvements						10,680
Initial Cost, Total	[1]					12,700
Costs Capitalized Subsequent to Acquisition	[2]					130
Gross Amount at Which Carried, Land						2,020
Gross Amount at Which Carried, Buildings and Improvements						10,810
Gross Amount at Which Carried, Total	[3]	$ 12,830				12,830
Accumulated Depreciation and Amortization		1,814				$ 1,814
Real Estate:
Balance at the end of the year	[3]	12,830
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 1,814
161 CORPORATE CENTER [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
161 CORPORATE CENTER [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
5 WALL STREET [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Encumbrances						$ 31,583
Initial Cost, Land						9,560
Initial Cost, Buildings and Improvements						50,276
Initial Cost, Total	[1]					59,836
Costs Capitalized Subsequent to Acquisition	[2]					0
Gross Amount at Which Carried, Land						9,560
Gross Amount at Which Carried, Buildings and Improvements						50,276
Gross Amount at Which Carried, Total	[3]	$ 59,836				59,836
Accumulated Depreciation and Amortization		6,271				$ 6,271
Real Estate:
Balance at the end of the year	[3]	59,836
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 6,271
5 WALL STREET [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
5 WALL STREET [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
1155 PERIMETER CENTER WEST [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 5,870
Initial Cost, Buildings and Improvements						66,849
Initial Cost, Total	[1]					72,719
Costs Capitalized Subsequent to Acquisition	[2]					5
Gross Amount at Which Carried, Land						5,870
Gross Amount at Which Carried, Buildings and Improvements						66,854
Gross Amount at Which Carried, Total	[3]	$ 72,724				72,724
Accumulated Depreciation and Amortization		7,039				$ 7,039
Real Estate:
Balance at the end of the year	[3]	72,724
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 7,039
1155 PERIMETER CENTER WEST [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
1155 PERIMETER CENTER WEST [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
PARK PLACE ON TURTLE CREEK [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,470
Initial Cost, Buildings and Improvements						38,048
Initial Cost, Total	[1]					42,518
Costs Capitalized Subsequent to Acquisition	[2]					1,778
Gross Amount at Which Carried, Land						4,470
Gross Amount at Which Carried, Buildings and Improvements						39,826
Gross Amount at Which Carried, Total	[3]	$ 44,296				44,296
Accumulated Depreciation and Amortization		3,603				$ 3,603
Real Estate:
Balance at the end of the year	[3]	44,296
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 3,603
PARK PLACE ON TURTLE CREEK [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
PARK PLACE ON TURTLE CREEK [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
80 CENTRAL STREET [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 1,980
Initial Cost, Buildings and Improvements						8,930
Initial Cost, Total	[1]					10,910
Costs Capitalized Subsequent to Acquisition	[2]					40
Gross Amount at Which Carried, Land						1,980
Gross Amount at Which Carried, Buildings and Improvements						8,970
Gross Amount at Which Carried, Total	[3]	$ 10,950				10,950
Accumulated Depreciation and Amortization		998				$ 998
Real Estate:
Balance at the end of the year	[3]	10,950
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 998
80 CENTRAL STREET [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
80 CENTRAL STREET [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
ENCLAVE PLACE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 1,890
Initial Cost, Buildings and Improvements						60,094
Initial Cost, Total	[1]					61,984
Costs Capitalized Subsequent to Acquisition	[2]					3,716
Gross Amount at Which Carried, Land						1,890
Gross Amount at Which Carried, Buildings and Improvements						63,810
Gross Amount at Which Carried, Total	[3]	$ 65,700				65,700
Accumulated Depreciation and Amortization		1,994				$ 1,994
Real Estate:
Balance at the end of the year	[3]	65,700
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 1,994
ENCLAVE PLACE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
ENCLAVE PLACE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
SUNTRUST CENTER [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 11,660
Initial Cost, Buildings and Improvements						139,015
Initial Cost, Total	[1]					150,675
Costs Capitalized Subsequent to Acquisition	[2]					(192)
Gross Amount at Which Carried, Land						11,660
Gross Amount at Which Carried, Buildings and Improvements						138,823
Gross Amount at Which Carried, Total	[3]	$ 150,483				150,483
Accumulated Depreciation and Amortization		6,981				$ 6,981
Real Estate:
Balance at the end of the year	[3]	150,483
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 6,981
SUNTRUST CENTER [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
SUNTRUST CENTER [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
GALLERIA 300 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 4,000
Initial Cost, Buildings and Improvements						73,554
Initial Cost, Total	[1]					77,554
Costs Capitalized Subsequent to Acquisition	[2]					1,003
Gross Amount at Which Carried, Land						4,000
Gross Amount at Which Carried, Buildings and Improvements						74,557
Gross Amount at Which Carried, Total	[3]	$ 78,557				78,557
Accumulated Depreciation and Amortization		4,329				$ 4,329
Real Estate:
Balance at the end of the year	[3]	78,557
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 4,329
GALLERIA 300 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
GALLERIA 300 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
GLENRIDGE HIGHLANDS ONE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 5,960
Initial Cost, Buildings and Improvements						50,013
Initial Cost, Total	[1]					55,973
Costs Capitalized Subsequent to Acquisition	[2]					886
Gross Amount at Which Carried, Land						5,960
Gross Amount at Which Carried, Buildings and Improvements						50,899
Gross Amount at Which Carried, Total	[3]	$ 56,859				56,859
Accumulated Depreciation and Amortization		3,078				$ 3,078
Real Estate:
Balance at the end of the year	[3]	56,859
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 3,078
GLENRIDGE HIGHLANDS ONE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
GLENRIDGE HIGHLANDS ONE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
CNL CENTER I [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						99.00%
Initial Cost, Land						$ 6,470
Initial Cost, Buildings and Improvements						77,858
Initial Cost, Total	[1]					84,328
Costs Capitalized Subsequent to Acquisition	[2]					(263)
Gross Amount at Which Carried, Land						6,470
Gross Amount at Which Carried, Buildings and Improvements						77,595
Gross Amount at Which Carried, Total	[3]	$ 84,065				84,065
Accumulated Depreciation and Amortization		1,505				$ 1,505
Real Estate:
Balance at the end of the year	[3]	84,065
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 1,505
CNL CENTER I [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
CNL CENTER I [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
CNL CENTER II [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						99.00%
Initial Cost, Land						$ 4,550
Initial Cost, Buildings and Improvements						55,609
Initial Cost, Total	[1]					60,159
Costs Capitalized Subsequent to Acquisition	[2]					754
Gross Amount at Which Carried, Land						4,550
Gross Amount at Which Carried, Buildings and Improvements						56,363
Gross Amount at Which Carried, Total	[3]	$ 60,913				60,913
Accumulated Depreciation and Amortization		1,106				$ 1,106
Real Estate:
Balance at the end of the year	[3]	60,913
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 1,106
CNL CENTER II [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
CNL CENTER II [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
ONE WAYSIDE ROAD [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 6,240
Initial Cost, Buildings and Improvements						57,124
Initial Cost, Total	[1]					63,364
Costs Capitalized Subsequent to Acquisition	[2]					0
Gross Amount at Which Carried, Land						6,240
Gross Amount at Which Carried, Buildings and Improvements						57,124
Gross Amount at Which Carried, Total	[3]	$ 63,364				63,364
Accumulated Depreciation and Amortization		1,643				$ 1,643
Real Estate:
Balance at the end of the year	[3]	63,364
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 1,643
ONE WAYSIDE ROAD [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
ONE WAYSIDE ROAD [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
GALLERIA 200 [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						100.00%
Initial Cost, Land						$ 6,470
Initial Cost, Buildings and Improvements						55,825
Initial Cost, Total	[1]					62,295
Costs Capitalized Subsequent to Acquisition	[2]					(24)
Gross Amount at Which Carried, Land						6,470
Gross Amount at Which Carried, Buildings and Improvements						55,801
Gross Amount at Which Carried, Total	[3]	$ 62,271				62,271
Accumulated Depreciation and Amortization		768				$ 768
Real Estate:
Balance at the end of the year	[3]	62,271
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 768
GALLERIA 200 [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
GALLERIA 200 [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
750 W. JOHN CARPENTER FREEWAY [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	[10]					100.00%
Initial Cost, Land	[10]					$ 7,860
Initial Cost, Buildings and Improvements	[10]					36,303
Initial Cost, Total	[1],[10]					44,163
Costs Capitalized Subsequent to Acquisition	[2],[10]					0
Gross Amount at Which Carried, Land	[10]					7,860
Gross Amount at Which Carried, Buildings and Improvements	[10]					36,303
Gross Amount at Which Carried, Total	[3],[10]	$ 44,163				44,163
Accumulated Depreciation and Amortization	[10]	219				$ 219
Real Estate:
Balance at the end of the year	[3],[10]	44,163
Accumulated Depreciation and Amortization:
Balance at the end of the year	[10]	$ 219
750 W. JOHN CARPENTER FREEWAY [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[10]	0 years
750 W. JOHN CARPENTER FREEWAY [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[10]	40 years
PIEDMONT POWER, LLC [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	[11]					100.00%
Initial Cost, Land	[11]					$ 0
Initial Cost, Buildings and Improvements	[11]					79
Initial Cost, Total	[1],[11]					79
Costs Capitalized Subsequent to Acquisition	[2],[11]					2,740
Gross Amount at Which Carried, Land	[11]					0
Gross Amount at Which Carried, Buildings and Improvements	[11]					2,819
Gross Amount at Which Carried, Total	[3],[11]	$ 2,819				2,819
Accumulated Depreciation and Amortization	[11]	534				$ 534
Real Estate:
Balance at the end of the year	[3],[11]	2,819
Accumulated Depreciation and Amortization:
Balance at the end of the year	[11]	$ 534
PIEDMONT POWER, LLC [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[11]	0 years
PIEDMONT POWER, LLC [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6],[11]	40 years
UNDEVELOPED LAND PARCELS [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage	[12]					100.00%
Initial Cost, Land	[12]					$ 18,061
Initial Cost, Buildings and Improvements	[12]					0
Initial Cost, Total	[1],[12]					18,061
Costs Capitalized Subsequent to Acquisition	[2],[12]					24,904
Gross Amount at Which Carried, Land	[12]					18,061
Gross Amount at Which Carried, Buildings and Improvements	[12]					24,904
Gross Amount at Which Carried, Total	[3],[12]	$ 42,965				42,965
Accumulated Depreciation and Amortization	[12]	6				$ 6
Real Estate:
Balance at the end of the year	[3],[12]	42,965
Accumulated Depreciation and Amortization:
Balance at the end of the year	[12]	6
8560 UPLAND DRIVE [Member]
Real Estate and Accumulated Depreciation [Line Items]
Ownership Percentage						72.00%
Initial Cost, Land						$ 1,954
Initial Cost, Buildings and Improvements						11,216
Initial Cost, Total	[1]					13,170
Costs Capitalized Subsequent to Acquisition	[2]					1,438
Gross Amount at Which Carried, Land						2,048
Gross Amount at Which Carried, Buildings and Improvements						12,560
Gross Amount at Which Carried, Total	[3]	14,608				14,608
Accumulated Depreciation and Amortization		4,979				$ 4,979
Real Estate:
Balance at the end of the year	[3]	14,608
Accumulated Depreciation and Amortization:
Balance at the end of the year		$ 4,979
8560 UPLAND DRIVE [Member] | Minimum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	0 years
8560 UPLAND DRIVE [Member] | Maximum [Member]
Real Estate and Accumulated Depreciation [Line Items]
Life on which Depreciation and Amortization is Computed	[6]	40 years
[1]	Total initial cost excludes purchase price allocated to intangible lease origination costs and intangible lease liabilities.
[2]	Includes write-offs of fully depreciated/amortized capitalized assets.
[3]	The net carrying value of Piedmont’s total assets for federal income tax purposes is approximately $4.3 billion.
[4]	Does not include impairment loss recognized on other assets as a result of the allocation of goodwill (See Note 2).
[5]	Consists of write-offs of intangible lease assets related to lease restructurings, amendments and terminations.
[6]	Piedmont’s assets are depreciated or amortized using the straight-lined method over the useful lives of the assets by class. Generally, Tenant Improvements and Lease Intangibles are amortized over the lease term. Generally, Building Improvements are depreciated over 5 - 25 years, Land Improvements are depreciated over 20 - 25 years, and Buildings are depreciated over 40 years.
[7]	Property is owned subject to a long-term ground lease.
[8]	As a result of its 49.5% membership interest in 1225 Eye Street, N.W. Associates, LLC, Piedmont owns 49.5% of the 1225 Eye Street building. Piedmont is deemed to have control over the joint venture and, as such, consolidates the joint venture, including the building.
[9]	As a result of its 49.5% membership interest in 1201 Eye Street, N.W. Associates, LLC, Piedmont owns 49.5% of the 1201 Eye Street building. Piedmont is deemed to have control over the joint venture and, as such, consolidates the joint venture, including the building.
[10]	As part of the acquisition of the property, Piedmont purchased an adjoining, developable land parcel of 3.5 acres for $1.0 million.
[11]	Represents solar panels at the 400 Bridgewater Crossing building.
[12]	Undeveloped Land Parcels includes land parcels which Piedmont may develop in the future, as well as the initial development costs of the 500 TownPark building.