Piedmont Office Realty Trust (PDM) 10-K 18 Feb 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information Document (USD $)	12 Months Ended
	Dec. 31, 2013	Feb. 17, 2014	Jun. 28, 2013
Document and Entity Information [Abstract]	'	'	'
Entity Registrant Name	'Piedmont Office Realty Trust, Inc.	'	'
Entity Central Index Key	'0001042776	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Large Accelerated Filer	'	'
Document Type	'10-K	'	'
Document Period End Date	31-Dec-13	'	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Amendment Flag	'false	'	'
Entity Common Stock, Shares Outstanding	'	154,288,003	'
Entity Well-known Seasoned Issuer	'Yes	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$2,965,463,289

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets:	'	'
Land	$688,761	$629,536
Buildings and improvements, less accumulated depreciation of $979,934 and $883,957 as of December 31, 2013 and December 31, 2012, respectively	3,164,575	2,908,078
Intangible lease assets, less accumulated amortization of $71,820 and $67,940 as of December 31, 2013 and December 31, 2012, respectively	74,377	54,745
Construction in progress	24,270	20,373
Total real estate assets	3,951,983	3,612,732
Investments in unconsolidated joint ventures	14,122	37,226
Cash and cash equivalents	6,973	12,957
Tenant receivables, net of allowance for doubtful accounts of $346 and $346 as of December 31, 2013 and December 31, 2012, respectively	31,145	25,038
Straight-line rent receivables	139,406	122,299
Due from unconsolidated joint ventures	266	463
Restricted cash and escrows	394	334
Prepaid expenses and other assets	24,771	21,283
Goodwill	180,097	180,097
Interest rate swaps	24,176	1,075
Deferred financing costs, less accumulated amortization of $13,041 and $10,479 as of December 31, 2013 and December 31, 2012, respectively	8,759	6,454
Deferred lease costs, less accumulated amortization of $126,465 and $108,380 as of December 31, 2013 and December 31, 2012, respectively	283,996	234,917
Total assets	4,666,088	4,254,875
Liabilities:	'	'
Unsecured debt	1,014,680	429,000
Secured debt	987,525	987,525
Accounts payable, accrued expenses, and accrued capital expenditures	128,818	127,263
Deferred income	22,267	21,552
Intangible lease liabilities, less accumulated amortization of $44,256 and $40,931 as of December 31, 2013 and December 31, 2012, respectively	47,113	40,805
Interest rate swaps	4,526	8,235
Total liabilities	2,204,929	1,614,380
Commitments and Contingencies	0	0
Stockholders' Equity:	'	'
Shares-in-trust, 150,000,000 shares authorized, none outstanding as of December 31, 2013 or December 31, 2012	0	0
Preferred stock, no par value, 100,000,000 shares authorized, none outstanding as of December 31, 2013 or December 31, 2012	0	0
Common stock, $.01 par value; 750,000,000 shares authorized, 157,460,903 shares issued and outstanding as of December 31, 2013; and 167,556,001 shares issued and outstanding at December 31, 2012	1,575	1,676
Additional paid-in capital	3,668,906	3,667,051
Cumulative distributions in excess of earnings	-1,231,209	-1,022,681
Other comprehensive income/(loss)	20,278	-7,160
Piedmont stockholders’ equity	2,459,550	2,638,886
Noncontrolling interest	1,609	1,609
Total stockholders’ equity	2,461,159	2,640,495
Total liabilities and stockholders’ equity	$4,666,088	$4,254,875

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Assets:	'	'
Intangible lease assets, accumulated amortization	$71,820	$67,940
Tenant receivables, allowance for doubtful accounts	346	346
Deferred financing costs, accumulated amortization	13,041	10,479
Deferred lease costs, accumulated amortization	126,465	108,380
Liabilities:	'	'
Intangible Lease Liabilities Accumulated Amortization	44,256	40,931
Stockholders' Equity:	'	'
Shares-in-trust, shares authorized	150,000,000	150,000,000
Shares-in-trust, shares outstanding	0	0
Preferred stock, par value	$0	$0
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$0.01	$0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares outstanding	157,460,903	167,556,001
Building and building improvements [Member]	'	'
Assets:	'	'
Buildings and improvements, accumulated depreciation	$979,934	$883,957

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:	'	'	'
Rental income	$447,687	$415,972	$409,711
Tenant reimbursements	104,567	106,754	113,813
Property management fee revenue	2,251	2,318	1,584
Total revenues	554,505	525,044	525,108
Expenses:	'	'	'
Property operating costs	222,979	208,280	202,531
Depreciation	122,562	110,359	100,686
Amortization	45,651	49,562	54,008
Impairment loss	1,242	0	0
General and administrative	21,883	20,765	25,072
Operating Expenses	414,317	388,966	382,297
Real estate operating income	140,188	136,078	142,811
Other income (expense):	'	'	'
Interest expense	-73,583	-65,023	-65,817
Interest income and other income/(expense)	-2,352	833	2,866
Litigation settlement recovery/(expense)	1,250	-7,500	0
Net casualty recoveries/(loss)	10,561	-5,170	0
Equity in income/(loss) of unconsolidated joint ventures	-3,676	923	1,619
Loss on consolidation	-898	0	1,532
Gain on extinguishment of debt	0	0	1,039
Nonoperating Income (Expense)	-68,698	-75,937	-58,761
Income from continuing operations	71,490	60,141	84,050
Discontinued operations:	'	'	'
Operating income, excluding impairment loss	2,363	5,501	18,349
Impairment loss	-6,402	0	0
Gain on sale of real estate assets	31,292	27,577	122,657
Income from discontinued operations	27,253	33,078	141,006
Net income	98,743	93,219	225,056
Less: Net income attributable to noncontrolling interest	-15	-15	-15
Net income attributable to Piedmont	$98,728	$93,204	$225,041
Per share information— basic and diluted:	'	'	'
Income from continuing operations (in dollars per share)	$0.44	$0.35	$0.49
Income from discontinued operations (in dollars per share)	$0.16	$0.20	$0.81
Net income available to common stockholders (in dollars per share)	$0.60	$0.55	$1.30
Weighted-average common shares outstanding - basic (in shares)	165,012,713	170,312,328	172,764,838
Weighted-average common shares outstanding - diluted (in shares)	165,137,482	170,441,223	172,980,947

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Net income attributable to Piedmont	$98,728	$93,204	$225,041
Other comprehensive income/(loss):	'	'	'
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 7)	24,312	-7,656	-3,064
Reclassification of previously recorded loss included in net income (See Note 7)	3,126	3,033	1,218
Other comprehensive income/(loss)	27,438	-4,623	-1,846
Comprehensive income attributable to Piedmont	$126,166	$88,581	$223,195

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	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]
In Thousands, except Share data, unless otherwise specified
Balance, value at Dec. 31, 2010	$2,773,454	$1,727	$3,661,308	($895,122)	($691)	$6,232
Balance (in shares) at Dec. 31, 2010	'	172,658,000	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Share repurchases as part of an announced plan	-3,244	-2	'	-3,242	'	'
Stock repurchases as part of an announced plan (in shares)	'	-199,000	'	'	'	'
Offering costs associated with issuance of common stock	-479	'	-479	'	'	'
Attribution of asset sales proceeds to noncontrolling interest	-2,684	'	'	'	'	-2,684
Dividends to common stockholders, distributions to noncontrolling interest, and dividends reinvested	-220,365	'	-249	-217,709	'	-2,407
Shares issued under the 2007 Omnibus Incentive Plan, net of tax	3,083	1	3,082	'	'	'
Shares issued under the 2007 Omnibus Incentive Plan, net of tax, shares	'	171,000	'	'	'	'
Net income attributable to noncontrolling interest	468	'	'	'	'	468
Net income attributable to Piedmont	225,041	'	'	225,041	'	'
Other comprehensive income	-1,846	'	'	'	-1,846	'
Balance, value at Dec. 31, 2011	2,773,428	1,726	3,663,662	-891,032	-2,537	1,609
Balance, (in shares) at Dec. 31, 2011	'	172,630,000	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Share repurchases as part of an announced plan	-88,737	-52	'	-88,685	'	'
Stock repurchases as part of an announced plan (in shares)	'	-5,255,000	'	'	'	'
Offering costs associated with issuance of common stock	567	'	567	'	'	'
Dividends to common stockholders, distributions to noncontrolling interest, and dividends reinvested	-136,378	'	-195	-136,168	'	-15
Shares issued under the 2007 Omnibus Incentive Plan, net of tax	3,019	2	3,017	'	'	'
Shares issued under the 2007 Omnibus Incentive Plan, net of tax, shares	'	181,000	'	'	'	'
Net income attributable to noncontrolling interest	15	'	'	'	'	15
Net income attributable to Piedmont	93,204	'	'	93,204	'	'
Other comprehensive income	-4,623	'	'	'	-4,623	'
Balance, value at Dec. 31, 2012	2,640,495	1,676	3,667,051	-1,022,681	-7,160	1,609
Balance, (in shares) at Dec. 31, 2012	167,556,001	167,556,000	'	'	'	'
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Share repurchases as part of an announced plan	-175,269	-102	'	-175,167	'	'
Stock repurchases as part of an announced plan (in shares)	'	-10,246,000	'	'	'	'
Offering costs associated with issuance of common stock	-91	'	-91	'	'	'
Dividends to common stockholders, distributions to noncontrolling interest, and dividends reinvested	-132,301	'	-197	-132,089	'	-15
Shares issued under the 2007 Omnibus Incentive Plan, net of tax	2,144	1	2,143	'	'	'
Shares issued under the 2007 Omnibus Incentive Plan, net of tax, shares	150,852	151,000	'	'	'	'
Net income attributable to noncontrolling interest	15	'	'	'	'	15
Net income attributable to Piedmont	98,728	'	'	98,728	'	'
Other comprehensive income	27,438	'	'	'	27,438	'
Balance, value at Dec. 31, 2013	$2,461,159	$1,575	$3,668,906	($1,231,209)	$20,278	$1,609
Balance, (in shares) at Dec. 31, 2013	157,460,903	157,461,000	'	'	'	'

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Dividends to common stockholders per share	$0.20	$0.20	$0.20	$0.20	$0.20	$0.20	$0.20	$0.20	$0.80	$0.80	$1.26

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash Flows from Operating Activities:	'	'	'
Net income	$98,743	$93,219	$225,056
Operating distributions received from unconsolidated joint ventures	1,475	2,338	2,932
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Income attributable to noncontrolling interest- discontinued operations	0	0	453
Depreciation	123,566	113,650	109,730
Amortization of deferred financing costs and fair market value adjustments on notes payable	2,620	2,648	4,777
Settlement of forward starting interest rate swaps	672	0	0
Other amortization	43,939	47,479	56,688
Impairment loss on wholly-owned properties	7,644	0	0
Gain on extinguishment of debt	0	0	-1,041
Accretion of discount on notes receivable	0	0	-482
Stock compensation expense	1,590	2,246	4,705
Reduction of long-lived assets due to casualty event	0	1,980	0
Equity in income of unconsolidated joint ventures	3,676	-923	-1,609
Loss/(gain) on consolidation	898	0	-1,532
Gain on sale of real estate assets	-31,292	-27,577	-122,657
Changes in assets and liabilities:	'	'	'
Increase in tenant and straight-line rent receivables, net	-29,101	-21,720	-13,295
(Increase)/decrease in restricted cash and escrows	-60	8,705	18,720
Increase in prepaid expenses and other assets	-3,427	-3,837	-2,727
(Decrease)/increase in accounts payable and accrued expenses	-6,434	8,486	3,511
Increase/(decrease) in deferred income	570	-5,769	-16,134
Net cash provided by operating activities	215,079	220,925	267,095
Cash Flows from Investing Activities:	'	'	'
Acquisition of real estate assets and related intangibles	-366,182	-4,225	-161,576
Capitalized expenditures, net of accruals	-175,988	-104,262	-54,033
Acquisition of unconsolidated joint ventures, net of cash assumed	-14,242	0	0
Cash assumed upon consolidation of variable interest entity	0	0	5,063
Net sale proceeds from wholly-owned properties and consolidated joint venture	95,671	93,839	291,785
Net sale proceeds received from unconsolidated joint ventures	0	0	3,036
Investments in unconsolidated joint ventures	-793	-136	-151
Liquidation of noncontrolling interest upon sale of consolidated joint venture	0	0	-95
Deferred lease costs paid	-34,298	-48,692	-47,049
Net cash provided/(used in) by investing activities	-495,832	-63,476	36,980
Cash Flows from Financing Activities:	'	'	'
Deferred financing costs paid	-4,892	-3,125	-3,367
Proceeds from debt	1,085,604	409,000	829,000
Repayments of debt	-500,000	-465,000	-822,875
Net costs of issuance of common stock	-91	-229	-252
Repurchases of common stock as part of announced plan	-173,551	-88,450	-3,244
Dividends paid and discount on dividend reinvestments	-132,301	-136,378	-220,365
Net cash provided by/(used in) financing activities	274,769	-284,182	-221,103
Net increase/(decrease) in cash and cash equivalents	-5,984	-126,733	82,972
Cash and cash equivalents, beginning of year	12,957	139,690	56,718
Cash and cash equivalents, end of year	$6,973	$12,957	$139,690

Organization

Organization	12 Months Ended
	Dec. 31, 2013
Organization [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 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, 2013, Piedmont owned 78 office properties, as well as interests in two office buildings through an unconsolidated joint venture. Piedmont's consolidated office properties comprise 21.5 million square feet (unaudited) of primarily Class A commercial office space, and were 87.2% leased (unaudited) as of December 31, 2013. As of December 31, 2013, approximately 90% of our annualized lease revenue ("ALR") (unaudited) was generated from our primary  markets: Atlanta, Boston, Chicago, Los Angeles, Minneapolis, the New York Metropolitan Statistical Area ("MSA"), Texas (Dallas, Houston and Austin), and Washington, D.C.
	Piedmont internally evaluates all of the real estate assets as one operating segment, and accordingly, does not report segment information.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
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 of which Piedmont or any of its wholly-owned subsidiaries is considered the primary beneficiary, 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 three real properties through its ownership in Piedmont Washington Properties, Inc. Piedmont has evaluated this entity based on the criteria outlined above and concluded that it is not a variable interest entity (“VIE”) and that Piedmont has a controlling interest in Piedmont Washington Properties, Inc. Accordingly, Piedmont’s consolidated financial statements include the accounts of Piedmont Washington Properties, Inc.
	In addition, during the three years ended December 31, 2013, Piedmont owned interests in certain properties through its ownership in various unconsolidated joint venture partnerships. Although Piedmont is currently or was the majority equity participant in these joint ventures, Piedmont and its co-venturer exercised joint control over the properties held by the joint ventures. As a result, in accordance with GAAP, the accounts of these joint ventures are not consolidated, but rather accounted for using the equity method of accounting in Piedmont’s consolidated financial statements.
	Please refer to Note 6 for a summary of Piedmont’s interests in and consolidation treatment of its various VIEs as of December 31, 2013.
	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.
	All inter-company balances and transactions have been eliminated upon consolidation.
	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 are stated at cost, as adjusted for any impairment, less accumulated depreciation. Amounts capitalized to real estate assets consist of the cost of acquisition or construction, any tenant improvements or major improvements, and betterments that extend the useful life of the related asset. All repairs and maintenance are expensed as incurred. Additionally, Piedmont capitalizes interest while the development of a real estate asset is in progress. Approximately $31,000, $0, and $0 of interest was capitalized for the years ended December 31, 2013, 2012, and 2011, 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 improvements	Shorter of economic life or 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. When indicators of potential impairment are present for wholly-owned properties, 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 with the estimated fair values, less costs to sell, for assets held for sale. Piedmont generally considers assets to be held for sale at the point at which a sale contract is executed and earnest money has become non-refundable. 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).
	For properties owned as part of an investment in unconsolidated joint ventures, Piedmont assesses the fair value of its investment as compared to its carrying amount. If Piedmont determines that the carrying value is greater than the 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 fair value amount.
	Allocation of Purchase Price of Acquired Assets
	Upon the acquisition of real properties, Piedmont allocates the purchase price of properties to acquired 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 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 fair value of these assets. Management determines the as-if-vacant 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, including leasing commissions and other related costs. In estimating carrying costs, management includes real estate taxes, insurance, and other operating expenses during the expected lease-up periods based on current market conditions.
	The 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 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 recorded at acquisition as of December 31, 2013 and 2012, respectively, are as follows (in thousands):
		31-Dec-13		December 31, 2012
	Intangible Lease Assets:
	Above-Market In-Place Lease Assets	$	21,137	$	21,468
	Absorption Period Costs	$	125,060	$	101,217
	Intangible Lease Origination Costs (included in Deferred Lease Costs)	$	158,427	$	116,995
	Intangible Lease Liabilities (Below-Market In-Place Leases)	$	91,369	$	81,736
	For the years ended December 31, 2013, 2012, and 2011, respectively, Piedmont recognized amortization of intangible lease costs as follows (in thousands):
		2013		2012		2011
	Amortization expense related to Intangible Lease Origination Costs and Absorption Period Costs	$	30,409	$	36,151	$	48,013
	Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	$	5,278	$	5,678	$	7,065
	Net intangible assets and liabilities as of December 31, 2013 will be amortized as follows (in thousands):
		Intangible Lease Assets
		Above-Market		Absorption		Intangible Lease		Below-Market
		In-place		Period Costs		Origination Costs(1)		In-place Lease
		Lease Assets						Liabilities
	For the year ending December 31:
	2014	$	2,050	$	15,046	$	18,882	$	6,825
	2015	1,891		13,789		17,490		6,328
	2016	1,662		10,996		14,652		6,205
	2017	886		8,241		11,671		6,300
	2018	309		5,687		8,726		5,702
	Thereafter	131		13,689		21,449		15,753
		$	6,929	$	67,448	$	92,870	$	47,113
	Weighted-Average Amortization Period (in years)	4		6		6		8
	-1	Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets.
	Investments in Unconsolidated Joint Ventures
	Piedmont’s investments in unconsolidated joint ventures are 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" impairments, if any, attributable to such joint ventures. Pursuant to the terms of the unconsolidated joint venture agreements, all income and distributions are allocated to the joint venture partners in accordance with their respective ownership interests. Distributions of net cash from operations are generally distributed to the joint venture partners on a quarterly basis, and are classified as cash inflows from operating activities, as they are presumed to be returns on Piedmont’s investment in the respective 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.
	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 are stated at cost, which approximates fair value, and consist of investments in money market accounts.
	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 represent 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 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. Piedmont adjusted the allowance for doubtful accounts by recording provisions for/(recoveries of) bad debts of approximately $0.2, $0, and ($0.4) million for the years ended December 31, 2013, 2012, and 2011, respectively, which are included in general and administrative expenses in the accompanying consolidated statements of income.
	Due from Unconsolidated Joint Ventures
	Due from unconsolidated joint ventures represents operating distributions due to Piedmont from its investments in unconsolidated joint ventures which have been declared but not received as of period end.
	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 space, net of accumulated depreciation.
Prepaid expenses and other assets will be expensed as utilized or reclassified to other asset accounts upon being put into service in future periods. 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 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 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. Fair value is determined by adjusting the trading price of the stock for various factors including, but not limited to: (i) liquidity or transferability considerations, (ii) control premiums, and/or (iii) fully distributed premiums, if necessary, multiplied by the common shares outstanding. If such calculated 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 fair value of all tangible and intangible net assets of the entity from the entity’s fair value calculated in step one of the test. If the implied value of the goodwill (the remainder left after deducting the fair values of the entity from its calculated overall fair value in step one of the test) is less than the carrying value of goodwill, an impairment loss would be recognized.
Interest Rate Derivatives
Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. Piedmont records all derivatives on the balance sheet at 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 also to determine if the forecasted transactions remain highly probable. Currently, Piedmont does not use derivatives for trading or speculative purposes.
The changes in 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. Changes in the fair values of derivatives designated as cash flow hedges that do not qualify for hedge accounting treatment, if any, would be recorded as gain/(loss) on interest rate swap in the consolidated statements of income. The 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 interest expense in the consolidated income statements as incurred. All of Piedmont's interest rate derivative agreements as of December 31, 2013 are designated as cash flow hedges.
Deferred Financing Costs
Deferred financing costs are comprised of costs incurred in connection with securing financing from third-party lenders including amounts paid directly to lenders and are capitalized and amortized 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 deferred financing costs for the years ended December 31, 2013, 2012, and 2011 of approximately $2.6 million, $2.6 million, and $3.2 million, respectively, which is included in interest expense in the accompanying consolidated statements of income.
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, 2013, 2012, or 2011, Piedmont capitalized approximately $0.1 million, $0, and $0, respectively, of internal leasing 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 $34.0 million, $29.8 million, and $30.0 million of deferred lease costs for the years ended December 31, 2013, 2012, and 2011, respectively, are included in amortization expense; and
•	Approximately $3.5 million, $2.5 million, and $3.7 million, of deferred lease costs related to lease incentives granted to tenants for the years ended December 31, 2013, 2012, and 2011, respectively, was included as an offset to rental income.
Upon receipt of a lease termination notice, Piedmont adjusts any unamortized deferred lease costs to their net realizable value 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 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, $0, and $1.4 million for the years ended December 31, 2013, 2012, and 2011, 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. On October 31, 2013, the board of directors of Piedmont authorized the repurchase and retirement of up to $150 million of Piedmont's common stock through October 2015. Piedmont may repurchase the shares from time to time, in accordance with applicable securities laws, in the open market or in privately negotiated transactions. Repurchases will depend 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, 2013, approximately $89.8 million is available for share repurchases through October 2015.
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 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) attributable 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 attributable to noncontrolling interest in the accompanying consolidated statements of income.
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 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 and a multi-year performance share component. Awards granted pursuant to the annual restricted stock component are considered equity awards and expensed straight-line over the vesting period, with issuances recorded as a reduction to additional paid in capital. Awards granted pursuant to the performance share component are considered liability awards and 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. Additionally, Piedmont has adopted a nonqualified deferred compensation plan which allows certain employees to elect to defer their receipt of compensation, including but not limited to any stock-based compensation, until future taxable years.
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.
Litigation Settlement Expense and Related Insurance Recoveries
During the year ended December 31, 2012, Piedmont settled two separate securities class action lawsuits and recorded $7.5 million in litigation settlement expense. During the year ended December 31, 2013, Piedmont received and recognized approximately $1.3 million of insurance recoveries related to the settlement.
Net Casualty Loss/(Gain)
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. 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 insurance recoveries related to such losses, if applicable, are recorded as income in the period receipt is determined to be probable. Insurance recoveries in excess of losses recognized or related to business interruption are recorded as income in the period that the insurance company definitively notifies Piedmont of its intent to issue payment. During the years ended December 31, 2013, 2012, and 2011, Piedmont recognized $1.5 million, $0, and $0 in business interruption insurance recoveries, respectively. Casualty losses are presented net of insurance recovery income recorded during the period. During the years ended December 31, 2013 and 2012, substantially all of the net casualty loss recorded related to losses incurred in Piedmont's New York/New Jersey portfolio as a result of Hurricane Sandy which occurred in October 2012.
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. Outstanding stock options have been excluded from the diluted earnings per share calculation, as their impact would be anti-dilutive.
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. Accordingly, neither a provision nor a benefit for federal income taxes has been made in the accompanying consolidated financial statements. 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. Additionally, Piedmont conducts certain operations through its taxable REIT subsidiary, Piedmont Office Holdings, Inc. These operations resulted in recording a provision for income taxes of approximately $0, $9 thousand and $5 thousand for the years ended December 31, 2013, 2012, and 2011, respectively.
Reclassifications
Certain prior period amounts have been reclassified to conform to the current period financial statement presentation. The reclassifications relate to the required presentation of income from discontinued operations for properties sold during the years ended December 31, 2013, 2012, and 2011 (see Note 14), as well as reclassifying deferred common area maintenance costs from deferred lease costs to prepaid and other assets. None of these reclassifications affect net income or net equity attributable to Piedmont as presented in previous periods.

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2013
Acquisitions [Abstract]	'
Acquisitions	'
	Acquisitions
	During the year ended December 31, 2013, Piedmont acquired the following properties and parcel of undeveloped land:
	Property		Metropolitan Statistical Area	Date of Acquisition	Rentable Square Feet (Unaudited)	Percentage Leased as of Acquisition (Unaudited)			Contractual Purchase Price (in millions)
	Arlington Gateway		Washington, D.C.	March 4, 2013	333,948	99		%	$	175.6
	5 & 15 Wayside Road		Boston, MA	March 22, 2013	271,434	95		%	$	69.3
	2020 W. 89th Street	(1)	Kansas City, KS	August 12, 2013	68,376	85		%	$	4.3
	5301 Maryland Way	(1)	Nashville, TN	August 12, 2013	201,237	100		%	$	18.5
	4685 Investment Drive	(1)	Detroit, MI	August 12, 2013	77,045	100		%	$	10
	6565 MacArthur Blvd		Dallas, TX	December 5, 2013	259,819	93		%	$	46.6
	One Lincoln Park		Dallas, TX	December 20, 2013	261,826	79		%	$	56.7
	161 Corporate Center		Dallas, TX	December 30, 2013	104,895	91		%	$	16
	Land Parcel		Metropolitan Statistical Area	Date of Acquisition	Acreage	Purchase Price (in millions)
	Royal Lane		Dallas, TX	August 1, 2013	10.59	$	2.6
	(1)	On August 12, 2013, Piedmont purchased all of the remaining interests in three office properties previously held through two unconsolidated joint ventures for approximately $14.7 million in cash.

Unconsolidated_Joint_Ventures

Unconsolidated Joint Ventures	12 Months Ended
	Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Unconsolidated Joint Ventures	'
	Unconsolidated Joint Ventures
	Investments in Unconsolidated Joint Ventures
	As of December 31, 2013 and 2012, Piedmont owned interests in the following unconsolidated joint ventures (in thousands):
	Name of Joint Venture		Properties Held by Joint Venture	Piedmont’s		Net Book Value
				Approximate
				Ownership
				Percentage
						2013		2012
	Fund XIII and REIT Joint Venture		8560 Upland Drive	72	%	$	14,122	$	18,814
			Two Park Center
	Fund XII and REIT Joint Venture	(1)	4685 Investment Drive	55	%	—		15,813
			5301 Maryland Way
	Fund XI, XII and REIT Joint Venture	(1)	2020 W. 89th Street	57	%	—		2,599
						$	14,122	$	37,226
	(1)	On August 12, 2013, Piedmont purchased all of the remaining interests in three office properties previously held through these two unconsolidated joint ventures for approximately $14.7 million in cash, representing the estimated fair value of the respective property, less Piedmont's existing investment in the respective unconsolidated joint ventures. Such estimated fair value was derived by reference to a credible, unrelated third-party offer and verified using discounted cash flow analysis. Under the terms of the respective joint venture agreements, Piedmont exercised its dissenter's right to buy out each of its co-venturers' interests based upon the terms of the third-party offer. The $0.9 million difference between the fair value of the properties acquired and the sum of Piedmont's previously recorded book value in investment in unconsolidated joint ventures plus cash consideration paid for the interests was recorded as a loss on consolidation in Piedmont's consolidated statement of operations for the year ended December 31, 2013.

Debt

Debt	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Debt	'
	Debt
	During the year ended December 31, 2013, Piedmont entered into two new debt facilities as detailed below.
	On May 9, 2013, Piedmont OP issued $350 million in aggregate principal amount of 3.40% Senior Notes (the “$350 Million Senior Notes”), which mature on June 1, 2023, pursuant to an indenture, dated as of May 9, 2013, by and among Piedmont OP, Piedmont, as guarantor, and U.S. Bank National Association, as trustee. Interest on the $350 Million Senior Notes is payable semi-annually in arrears on June 1 and December 1 of each year, and the $350 Million Senior Notes are fully and unconditionally guaranteed on a senior unsecured basis by Piedmont. Piedmont OP may, at its option, redeem the $350 Million Senior Notes, in whole at any time or in part from time to time, in each case prior to March 1, 2023, at a redemption price equal to the greater of (i) 100% of the principal amount of the $350 Million Senior Notes to be redeemed and (ii) a “make-whole” amount, plus unpaid interest, if any. In addition, at any time on or after March 1, 2023, Piedmont OP may, at its option, redeem the $350 Million Senior Notes, in whole at any time or in part from time to time, at a redemption price equal to 100% of the principal amount of the $350 Million Senior Notes to be redeemed plus unpaid interest, if any.
	The $350 Million Senior Notes contain certain covenants that, subject to certain exceptions, limit the ability of Piedmont and Piedmont OP to, among other things, incur additional secured and unsecured indebtedness and to merge, consolidate, sell, lease or otherwise dispose of their properties and assets substantially as an entirety. Additionally, these covenants require Piedmont to maintain a pool of unencumbered assets. The $350 Million Senior Notes contain customary events of default which, if any of them occurs, would permit or require the principal of and accrued interest on the $350 Million Senior Notes to be declared due and payable. Piedmont used the proceeds from the $350 Million Senior Notes to partially repay outstanding amounts under its $500 Million Unsecured Line of Credit, which had been used to purchase properties and repurchase shares of its common stock.
	Additionally, on December 18, 2013, Piedmont OP entered into a $300 million unsecured delayed draw term loan facility (the “$300 Million Unsecured 2013 Term Loan”) with a consortium of lenders. The term of the facility is five years with a maturity date of January 31, 2019. Piedmont OP paid customary arrangement and upfront fees to the lenders in connection with the closing of the facility. On January 30, 2014, Piedmont OP drew down the entire $300 million in principal under the facility. Of the proceeds, $225 million was used to repay the maturing mortgage on Aon Center, and $75 million was used to pay down a portion of the balance outstanding under the $500 Million Unsecured Line of Credit.
	The $300 Million Unsecured 2013 Term Loan has the option to bear interest at varying levels based on the sum of (i) the London Interbank Offered Rate (“LIBOR”) or Base Rate (defined as the greater of the prime rate, the federal funds rate plus one-half of one percent, or 30-day LIBOR plus one percent), and (ii) a spread which can vary from 0% to 1.95% based on the credit rating levels issued for Piedmont or Piedmont OP. As of December 31, 2013, the stated interest rate spread was 1.20% based on the Piedmont's then current credit rating.
	Under the terms of the $300 Million Unsecured 2013 Term Loan, Piedmont OP is subject to certain financial covenants that require, among other things, the maintenance of an unencumbered interest coverage ratio of at least 1.75, an unencumbered leverage ratio of at least 1.60, a fixed charge coverage ratio of at least 1.50, a leverage ratio of no more than 0.60, and a secured debt ratio of no more than 0.40.
	The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2013 and 2012 (in thousands):
	Facility		Collateral	Rate(1)			Maturity		Amount Outstanding
									as of December 31,
									2013			2012
	Secured (Fixed)
	$200.0 Million Mortgage Note		Aon Center	4.87	%		5/1/14		$	200,000	(10)	$	200,000
	$25.0 Million Mortgage Note		Aon Center	5.7	%		5/1/14		25,000		(10)	25,000
	$350.0 Million Secured Pooled Facility		Nine Property Collateralized Pool(2)	4.84	%		6/7/14		350,000			350,000
	$105.0 Million Fixed-Rate Loan		US Bancorp Center	5.29	%		5/11/15		105,000			105,000
	$125.0 Million Fixed-Rate Loan		Four Property Collateralized Pool(3)	5.5	%		4/1/16		125,000			125,000
	$42.5 Million Fixed-Rate Loan		Las Colinas Corporate Center I & II	5.7	%		10/11/16		42,525			42,525
	$140.0 Million WDC Mortgage Notes		1201 & 1225 Eye Street	5.76	%		11/1/17		140,000			140,000
	Subtotal/Weighted Average(4)			5.17	%				987,525			987,525
	Unsecured (Variable and Fixed)
	$300 Million Unsecured 2011 Term Loan			LIBOR +  1.45%		(5)	11/22/16		300,000			300,000
	$500 Million Unsecured Line of Credit			1.35	%	(6)	8/19/16	(7)	366,000			129,000
	$350 Million Senior Notes			3.4	%	(8)	6/1/23		348,680			—
	$300 Million Unsecured 2013 Term Loan			LIBOR + 1.20%		(9)	1/31/19		—			—
	Subtotal/Weighted Average(4)			2.46	%				1,014,680			429,000
	Total/ Weighted Average(4)			3.8	%				$	2,002,205		$	1,416,525
	(1)	All of Piedmont’s outstanding debt as of December 31, 2013 and 2012 is interest-only debt.
	(2)	Nine property collateralized pool includes:1200 Crown Colony Drive in Quincy, Massachusetts, Braker Pointe III in Austin, Texas, 2 Gatehall Drive in Parsippany, New Jersey, the One and Two Independence Square buildings in Washington, DC, 2120 West End Avenue in Nashville, Tennessee, 400 Bridgewater Crossing in Bridgewater, New Jersey, 200 Bridgewater Crossing in Bridgewater, New Jersey, and Fairway Center II in Brea, California.
	(3)	Four property collateralized pool includes 1430 Enclave Parkway in Houston, Texas, Windy Point I and II in Schaumburg, Illinois, and 1055 East Colorado Boulevard in Pasadena, California.
	(4)	Weighted average is based on the net book value of outstanding debt and interest rates in the table (or as footnoted) as of December 31, 2013.
	(5)	The $300 Million Unsecured 2011 Term Loan has a stated variable rate; however, Piedmont entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, the rate on this facility to 2.69% through maturity.
	(6)	Piedmont may select from multiple interest rate options with each draw, including the prime rate and various length LIBOR locks. All LIBOR selections are subject to an additional spread (1.175% as of December 31, 2013) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of December 31, 2013 consists of LIBOR draws at an average rate of 0.17% (subject to the additional spread mentioned above). Further, for the year ended December 31, 2013, Piedmont incurred net borrowings of approximately $237.0 million on its outstanding line of credit.
	(7)	Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of August 21, 2017) provided Piedmont is not then in default and upon payment of extension fees.
	(8)	The $350 Million Senior Notes have a fixed coupon rate of 3.40%, however, as a result of the issuance of the notes at a discount, Piedmont recognizes an effective interest rate on this debt issuance of 3.45%.
	(9)	On January 30, 2014, Piedmont drew the full commitment of the $300 Million Unsecured 2013 Term Loan. Additionally, Piedmont entered into four interest rate swap agreements with a total notional value of $200 million to effectively fix the interest rate for this portion of the debt at 2.79%.
	(10)	On January 31, 2014, Piedmont used the proceeds of the $300 Million Unsecured 2013 Term Loan mentioned above to fully repay the $200 Million Mortgage Note and the $25 Million Mortgage Note.
	A summary of the aggregate maturities of Piedmont’s indebtedness as of December 31, 2013, is provided below (in thousands):
	2014	$	575,000
	2015	105,000
	2016	833,525		(1)
	2017	140,000
	2018	—
	Thereafter	350,000
	Total	$	2,003,525
	-1	Includes the balance outstanding as of December 31, 2013 of the $500 Million Unsecured 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 August 21, 2017) provided Piedmont is not then in default and upon payment of extension fees.
	Piedmont’s weighted-average interest rate as of December 31, 2013 and 2012, for aforementioned borrowings was approximately 3.80% and 4.30%, respectively. Piedmont made interest payments on all indebtedness, including interest rate swap cash settlements and net of capitalized interest, of approximately $69.8 million, $62.6 million, and $66.7 million during the years ended December 31, 2013, 2012, and 2011, respectively.

Variable_Interest_Entities

Variable Interest Entities	12 Months Ended
	Dec. 31, 2013
Variable Interest Entities [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 are considered to be the primary beneficiary and must consolidate the VIE.
	A summary of Piedmont’s interests in and consolidation treatment of its VIEs as of December 31, 2013 is as follows, (net carrying amount in millions):
	Entity	Piedmont’s		Related	Consolidated/	Net Carrying Amount as of			Net Carrying Amount as of			Primary Beneficiary
		%		Building	Unconsolidated	December 31,			December 31,			Considerations
		Ownership				2013			2012
		of Entity
	1201 Eye Street NW Associates, LLC	49.5	%	1201 Eye	Consolidated	$	(5.3	)	$	(5.7	)	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.
				Street
	1225 Eye Street NW Associates, LLC	49.5	%	1225 Eye	Consolidated	$	(0.9	)	$	(0.1	)	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.
				Street
	Piedmont 500 W. Monroe Fee, LLC	100	%	500 W. Monroe	Consolidated	$	228.3		$	194		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 the economic benefits of the property until such returns are met.
	Suwanee Gateway One, LLC	100	%	Suwanee	Consolidated	$	7.4		$	7.6		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
				Gateway
				One
	Medici Atlanta, LLC	100	%	The Medici	Consolidated	$	14.4		$	13.7		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
	400 TownPark, LLC	100	%	400 TownPark	Consolidated	$	22.3		$	23.5		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
	Each of the VIEs described above has the sole purpose of holding 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.

Derivative_Instruments

Derivative Instruments	12 Months Ended
	Dec. 31, 2013
Derivative Instruments [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. During the year ended December 31, 2013, Piedmont used four interest rate swap agreements with a total notional value of $300 million to hedge the variable cash flows associated with its $300 Million Unsecured Term Loan.
	During 2012 and 2013, Piedmont entered into six forward starting interest rate swap agreements with a total notional value of $530 million to hedge the risk of changes in the interest-related cash flows associated with various potential issuances of long-term debt. In conjunction with the issuance of the $350 Million Senior Notes (see Note 5), Piedmont settled two of the forward starting swap agreements with a total notional value of $250 million for a gain of approximately $0.7 million. The gain was recorded as accumulated other comprehensive income and is being amortized as an offset to interest expense over the ten-year term of the $350 Million Senior Notes. As of December 31, 2013, Piedmont continues to hold the remaining $280 million of forward starting interest rate swaps to hedge its exposure to the variability in future cash flows for additional potential future debt issuances over a maximum period of 123 months.
	A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2013 is as follows:
	Interest Rate Derivatives:	Notional Amount			Effective Date		Maturity Date
		(in millions)
	Interest rate swap	$	125		11/22/11		11/22/16
	Interest rate swap	75			11/22/11		11/22/16
	Interest rate swap	50			11/22/11		11/22/16
	Interest rate swap	50			11/22/11		11/22/16
	Forward starting interest rate swap	70			3/3/14		3/3/24
	Forward starting interest rate swap	70			3/3/14		3/3/24
	Forward starting interest rate swap	70			3/3/14		3/3/24
	Forward starting interest rate swap	70			3/3/14		3/3/24
	Total	$	580
	Piedmont has elected to present 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, 2013 and December 31, 2012, respectively, is as follows (in thousands):
	Interest rate swaps classified as:	December 31, 2013			December 31, 2012
	Gross derivative assets	$	24,176		$	1,075
	Gross derivative liabilities	(4,526		)	(8,235		)
	Net derivative asset/(liability)	$	19,650		$	(7,160	)
	All of Piedmont's interest rate derivative agreements outstanding for the periods presented were designated as cash flow hedges of interest rate risk. As such, the effective portion of changes in the fair value of these derivatives designated as, and that qualify as, cash flow hedges is recorded in OCI and is reclassified into earnings as interest expense in the period that the hedged forecasted transaction affects earnings. The effective portion of Piedmont's interest rate derivatives that was recorded in the accompanying consolidated statements of income for the years ended December 31, 2013, 2012, and 2011, respectively, was as follows (in thousands):
	Derivative in	2013			2012			2011
	Cash Flow Hedging
	Relationships (Interest Rate Swaps and Caps)
	Amount of loss/(gain) recognized in OCI on derivatives	$	(24,312	)	$	7,656		$	3,064
	Amount of previously recorded loss reclassified from accumulated OCI into interest expense	$	(3,126	)	$	(3,033	)	$	(1,218	)
	Piedmont estimates that an additional $7.3 million will be reclassified from accumulated other comprehensive loss as an increase to interest expense over the next twelve months. No gain or loss was recognized related to hedge ineffectiveness or to amounts excluded from effectiveness testing on Piedmont’s cash flow hedges during the years ended December 31, 2013, 2012, or 2011.
	Additionally, see Note 8 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 breached any of the contractual provisions of the derivative contracts, it would be required to settle its obligations under the agreements at their termination value plus accrued interest, or approximately $4.7 million. 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, 2013
Fair Value Measurement of Financial Instruments [Abstract]	'
Fair Value Measurements	'
	Fair Value Measurements
	Piedmont considers its cash, tenant receivables, 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 of December 31, 2013 and 2012, respectively (in thousands):
		2013					2012
	Financial Instrument	Carrying Value		Estimated		Level Within Fair Value Hierarchy	Carrying Value		Estimated		Level Within Fair Value Hierarchy
				Fair Value					Fair Value
	Assets:
	Cash and cash equivalents(1)	$	6,973	$	6,973	Level 1	$	12,957	$	12,957	Level 1
	Tenant receivables, net(1)	$	31,145	$	31,145	Level 1	$	25,038	$	25,038	Level 1
	Restricted cash and escrows(1)	$	394	$	394	Level 1	$	334	$	334	Level 1
	Interest rate swap asset	$	24,176	$	24,176	Level 2	$	1,075	$	1,075	Level 2
	Liabilities:
	Accounts payable and accrued expenses(1)	$	16,680	$	16,680	Level 1	$	23,113	$	23,113	Level 1
	Interest rate swap liability	$	4,526	$	4,526	Level 2	$	8,235	$	8,235	Level 2
	Debt	$	2,002,205	$	2,004,870	Level 2	$	1,416,525	$	1,470,002	Level 2
	(1)	For the periods presented, the carrying value approximates estimated fair value due to its short-term maturity.
	Piedmont's debt was carried at book value as of December 31, 2013 and 2012; however, Piedmont's estimate of its 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 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 and forward starting interest rate swap agreements presented above, and further discussed in Note 7 above are classified as “Interest rate swap” assets and liabilities in the accompanying consolidated balance sheets and were carried at fair value as of December 31, 2013 and 2012. 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 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 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, 2013 and 2012, 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 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 assets or liabilities.

Impairment_of_Certain_Real_Est

Impairment of Certain Real Estate Assets	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Impairment of Certain Real Estate Assets	'Impairment of Certain Real Estate AssetsPiedmont recorded the following impairment charges for the years ended December 31, 2013, 2012, and 2011 (in thousands):  2013 2012 2011Impairment losses included in continuing operations:      Impairment losses recorded in real estate operating expenses:      11107 and 11109 Sunset Hills Road $1,242 $— $—Impairment losses recorded in equity in loss of unconsolidated joint ventures:      Piedmont's Investment in Fund 13 and REIT JV (at Piedmont's approximate 72% ownership) $4,402 $— $—Impairment losses recorded in discontinued operations:      1111 Durham Avenue $6,402 $— $—During the year ended December 31, 2013, Piedmont reduced its intended holding period for the 11107 and 11109 Sunset Hills Road buildings in Reston, Virginia which resulted in the recording of an impairment loss of approximately $1.2 million to reduce the carrying value of the assets to their estimated fair value. The decision to reduce the holding period was prompted by the loss of prospective replacement tenants for the 11109 building and indications of value from brokers familiar with the buildings and expressions of interest from various potential third party buyers.During the year ended December 31, 2013, Piedmont also recorded a $4.4 million impairment charge related to a decline in the value of its equity method investment in Fund 13 and REIT Joint Venture ("Fund 13/REIT") that Piedmont deemed "other than temporary". Fund 13/REIT owns and operates two commercial office buildings: 8560 Upland Drive, located in Parker, Colorado, and Two Park Center, located in Hoffman Estates, Illinois. The decline in value of Piedmont's equity investment in Fund13/REIT is attributable to the expiration of the sole tenant of Two Park Center as of December 31, 2013, Piedmont's pessimism regarding the near-term identification of a replacement tenant given the current state of the Hoffman Estates commercial office market, and the implications of those events on Piedmont's ability to recover its basis in its equity method investment. In accordance with GAAP regarding fair value measurements, Piedmont valued the 11107 and 11109 Sunset Hills Road buildings using a Level 1 fair value measurement, as there are direct observations and transactions involving the asset by unrelated, potential third-party purchasers. The fair value measurement used in the evaluation of Fund 13/REIT is considered to be a Level 3 fair value measurement within the prescribed fair value hierarchy. During the year ended December 31, 2013, Piedmont sold the 1111 Durham Avenue building in South Plainfield, New Jersey and recorded an impairment charge of $6.4 million based on the difference between carrying value and fair value of the asset at the time it was reclassified from real estate assets held-for-use (at cost) to real estate assets held for sale (at estimated fair value). The fair value measurement used in the evaluation of this non-financial asset was based upon the amount set forth in the purchaser's original letter of intent which approximated the land value of the asset due to the age of construction and lack of near term leasing prospects for the building.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies [Abstract]	'
Commitments and Contingencies	'
	Commitments and Contingencies
	Commitments Under Existing Lease Agreements
	Certain lease agreements include provisions that may obligate Piedmont to provide funding for tenant or building improvements and/or leasing commissions. Piedmont classifies such tenant and building 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, 2013, Piedmont anticipates funding potential non-incremental capital expenditures of approximately $85.1 million related to its existing lease portfolio over the respective lease terms. The timing of the actual funding of these tenant improvements is largely dependent upon tenant requests for reimbursement, and in some cases, these obligations may expire with the underlying lease without further recourse to Piedmont. As of December 31, 2013, commitments for incremental capital expenditures associated with new leases, totaled approximately $19.5 million. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for such capital improvements or other financial obligations.
	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 additional expense related to such tenant audits/disputes of approximately $1.2 million, $0.2 million and $0.7 million during the years ended December 31, 2013, 2012, and 2011, respectively.
	Letters of Credit
	As of December 31, 2013, Piedmont was subject to the following letters of credit, which reduce the total outstanding capacity under its $500 Million Unsecured Line of Credit:
	Amount			Expiration of Letter of Credit (1)
	$	1,805,480	(2)	Jul-14
	$	9,033,164	(2)	Jul-14
	$	382,556		Jul-14
	(1)	All of Piedmont's outstanding letter of credit agreements contain an “evergreen” clause, which automatically renews for consecutive, one-year periods each anniversary, subject to certain limitations.
	(2)	These letter of credit agreements were terminated in conjunction with repaying the notes payable secured by the Aon Center building in Chicago, Illinois on February 3, 2014.
	Operating Lease Obligations
	Two properties including the 2001 NW 64th Street building in Ft. Lauderdale, Florida and the River Corporate Center building in Tempe, Arizona were subject to ground leases during the year with expiration dates of 2048 and 2101, respectively. The aggregate payments required under the terms of these operating leases as of December 31, 2013 are presented below (in thousands):
		2014	$	451
		2015	451
		2016	451
		2017	451
		2018	451
		Thereafter	41,071
		Total	$	43,326
	Ground rent expense was approximately $0.8 million, $0.8 million, and $0.6 million for the years ended December 31, 2013, 2012, and 2011, respectively, and is included in property operating costs in the accompanying consolidated statements of income. The net book value of the real estate assets of the related office buildings subject to operating ground leases is approximately $21.9 million and $31.8 million as of December 31, 2013 and 2012, respectively.
	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, 2013
Stock Based Compensation [Abstract]	'
Stock Based Compensation	'
	Stock Based Compensation
	Deferred Stock Awards
	Piedmont has granted deferred stock awards in the form of restricted stock to its employees. The awards are determined by the Compensation Committee of the board of directors of Piedmont on an annual basis and typically vest over a three-year period beginning on the grant date. In addition, Piedmont has adopted a multi-year performance share program for certain of its employees. Restricted shares are earned based on the relative performance of Piedmont's total stockholder return as compared with a predetermined peer group's total stockholder return over a three-year period. Shares are not awarded until after the end of the third year in the performance period and vest immediately upon award.
	A rollforward of Piedmont's deferred stock award activity for the year ended December 31, 2013 is as follows:
		Shares		Weighted-Average Grant Date Fair Value
	Unvested Deferred Stock Awards as of December 31, 2012	318,893		$	18.41
	Deferred Stock Awards Granted During Fiscal Year 2013	161,257		$	19.47
	Deferred Stock Awards Vested During Fiscal Year 2013	(209,284	)	$	18.91
	Deferred Stock Awards Forfeited During Fiscal Year 2013	(5,727	)	$	18.62
	Unvested Deferred Stock Awards as of December 31, 2013	265,139		$	18.65
	The following table provides additional information regarding stock award activity during the years ended December 31, 2013, 2012, and 2011 (in thousands except for per share data):
		2013			2012				2011
	Weighted-Average Grant Date Fair Value for Shares Granted During the Year (per share)	$	19.47		$	17.53			$	19.03
	Total Grant Date Fair Value of Shares Vested During the Year	$	3,957		$	5,331			$	5,405
	Share-based Liabilities Paid(1)	$	103		$	798			$	851
	(1)	Amounts reflect the issuance of performance share awards during the period.
	A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2013 is as follows:
	Date of grant		Type of Award	Net  Shares			Grant				Vesting Schedule	Unvested Shares as of
				Granted (1)			Date Fair					December 31, 2013
							Value
	5-Apr-11		Annual Deferred Stock Award	116,116			$	19.4			Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on April 5, 2012, 2013, and 2014, respectively.	36,835
	5-Apr-11		Fiscal Year 2011-2013 Performance Share Program	—			$	18.27			Shares awarded, if any, will vest immediately upon determination of award in 2014.	—	(2	)
	4-Apr-12		Annual Deferred Stock Award	190,134			$	17.53			Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on April 4, 2013, 2014, and 2015, respectively.	110,184
	4-Apr-12		Fiscal Year 2012-2014 Performance Share Program	—			$	17.42			Shares awarded, if any, will vest immediately upon determination of award in 2015.	—	(2	)
	2-Apr-13		Annual Deferred Stock Award	146,679			$	19.47			Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on April 2, 2014, 2015, and 2016, respectively.	118,120
	2-Apr-13		Fiscal Year 2013-2015 Performance Share Program	—			$	18.91			Shares awarded, if any, will vest immediately upon determination of award in 2016.	—	(2	)
	Total											265,139
	(1)	Amounts reflect the total grant to employees, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2013.
	(2)	Estimated based on Piedmont's cumulative total stockholder return ("TSR") for the respective performance period through December 31, 2013. As of December 31, 2013, Piedmont's TSR for each of these respective plans was below threshold. Such 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, 2013, 2012, and 2011, Piedmont recognized approximately $3.1 million, $3.9 million and $6.5 million of compensation expense related to stock awards, of which approximately $2.0 million, $2.5 million and $5.3 million, related to the amortization of nonvested shares, respectively. During the year ended December 31, 2013, a total of 150,852 shares were issued to employees, directors and officers. As of December 31, 2013, approximately $1.9 million of unrecognized compensation cost related to nonvested, annual deferred stock awards remained, which Piedmont will record in its statements of income over a weighted-average vesting period of approximately one year.

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	There are no adjustments to “Net income attributable to Piedmont” or “Income from continuing operations” for the diluted earnings per share computations.
	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 nonvested restricted stock. Diluted weighted average number of common shares is calculated to reflect the potential dilution under the treasury stock method that would occur as if the remaining unvested restricted stock awards has vested and resulted in additional common shares outstanding.
	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, 2013, 2012, and 2011 (in thousands):
		2013	2012	2011
	Weighted-average common shares—basic	165,013	170,312	172,765
	Plus incremental weighted-average shares resulting from the assumed conversion of time-vested restricted stock awards	124	129	216
	Weighted-average common shares—diluted	165,137	170,441	172,981

Operating_Leases

Operating Leases	12 Months Ended
	Dec. 31, 2013
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 and accrued expenses in the accompanying consolidated balance sheets.
	As of December 31, 2013, approximately 90% of our ALR (unaudited) is generated from our primary markets: Atlanta, Boston, Chicago, Los Angeles, Minneapolis, the New York MSA, Texas (Dallas, Houston and Austin), and Washington, D.C. Furthermore, almost 10% 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, 2013, is presented below (in thousands):
	Years ending December 31:
	2014	$	386,504
	2015	394,329
	2016	372,684
	2017	352,014
	2018	321,294
	Thereafter	1,446,082
	Total	$	3,272,907

Discontinued_Operations

Discontinued Operations	12 Months Ended
	Dec. 31, 2013
Discontinued Operations [Abstract]	'
Discontinued Operations	'
	Discontinued Operations
	Piedmont has classified the results of operations related to the following properties as discontinued operations (in thousands):
	Building Sold		Location		Date of Sale		Gain/(Loss) on Sale				Net Sales Proceeds
	Eastpointe Corporate Center		Issaquah, Washington		July 1, 2011		$	12,152			$	31,704
	5000 Corporate Court		Holtsville, New York		August 31, 2011		$	14,367			$	36,100
	35 West Wacker Drive	(1)	Chicago, Illinois		December 15, 2011		$	96,138			$	223,981
	Portland Portfolio	(2)	Beaverton, Oregon		March 19, 2012		$	17,823			$	43,832
	26200 Enterprise Way		Lake Forest, California		May 31, 2012		$	10,013			$	24,412
	110 & 112 Hidden Lake Circle Buildings		Duncan, South Carolina		September 21, 2012		$	(259	)		$	25,595
	1111 Durham Avenue		South Plainfield, New Jersey		March 28, 2013		$	(9	)		$	3,752
	1200 Enclave Parkway		Houston, Texas		May 1, 2013		$	16,246			$	45,552
	350 Spectrum Loop		Colorado Springs, Colorado		November 1, 2013		$	7,959			$	29,676
	8700 South Price Road		Tempe, Arizona		December 30, 2013		$	7,096			$	16,691
	(1)	Piedmont sold its approximate 96.5% ownership in the property. Transaction data above is presented at Piedmont's ownership percentage.
	(2)	The Portland Portfolio consisted of four office properties known as the Deschutes building, the Rhein building, the Rogue building, and the Willamette building, as well as 18.19 acres of adjoining, undeveloped land.
	Income from Discontinued Operations
	The details comprising income from discontinued operations are presented below (in thousands):
		Years Ended December 31,
		2013				2012				2011
	Revenues:
	Rental income	$	4,678			$	13,215			$	45,306
	Tenant reimbursements	757				1,528				20,632
		5,435				14,743				65,938
	Expenses:
	Property operating costs	1,900				5,216				26,243
	Depreciation	1,004				3,291				9,044
	Amortization	209				690				5,995
	General and administrative	2				45				(168		)
		3,115				9,242				41,114
	Other income (expense):
	Interest expense	—				—				(5,931		)
	Interest income and other income/(expense)	26				—				(91		)
	Net casualty recoveries	17				—				—
	Net loss attributable to noncontrolling interest	—				—				(453		)
		43				—				(6,475		)
	Operating income, excluding impairment loss and gain on sale of real estate assets	2,363				5,501				18,349
	Impairment loss	(6,402		)		—				—
	Gain on sale of real estate assets	31,292				27,577				122,657
	Income from discontinued operations	$	27,253			$	33,078			$	141,006

Supplemental_Disclosures_of_No

Supplemental Disclosures of Noncash Activities	12 Months Ended
	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]	'
Supplemental Disclosures of Noncash Activities	'
	Supplemental Disclosures of Noncash Activities
	Significant noncash investing and financing activities for the years ended December 31, 2013, 2012, and 2011 (in thousands) are outlined below:
		2013		2012			2011
	Accrued capital expenditures and deferred lease costs	$	12,460	$	12,598		$	8,218
	Change in accrued offering costs related to issuance of common stock	$	—	$	(567	)	$	227
	Net assets assumed upon consolidation of variable interest entity, net of notes receivable previously recorded	$	—	$	—		$	188,283
	Liabilities assumed upon consolidation of variable interest entity	$	—	$	—		$	191,814
	Change in accrued share repurchases as part of an announced plan	$	1,718	$	287		$	—

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Piedmont’s income tax basis net income for the years ended December 31, 2013, 2012, and 2011, is calculated as follows (in thousands):
		2013				2012				2011
	GAAP basis financial statement net income	$	98,728			$	93,204			$	225,041
	Increase (decrease) in net income resulting from:
	Depreciation and amortization expense for financial reporting purposes in excess of amounts for income tax purposes	42,374				35,125				47,346
	Rental income accrued for income tax purposes less than amounts for financial reporting purposes	(25,964		)		(10,422		)		(9,380		)
	Net amortization of above/below-market lease intangibles for financial reporting purposes in excess of amounts for income tax purposes	(4,701		)		(5,324		)		(6,605		)
	Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes	(35,153		)		(7,967		)		(66,410		)
	Taxable income of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes	—				2,662				4,515
	Other expenses for financial reporting purposes in excess of amounts for income tax purposes	9,045				14,361				(2,072		)
	Income tax basis net income, prior to dividends paid deduction	$	84,329			$	121,639			$	192,435
	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:
		2013			2012			2011
	Ordinary income	64	%		73	%		61	%
	Return of capital	36	%		11	%		12	%
	Capital gains	—	%		16	%		27	%
		100	%		100	%		100	%
	At December 31, 2013 and 2012, the tax basis carrying value of Piedmont’s total assets was approximately $4.5 billion and $4.1 billion, respectively.
	Accrued interest and penalties related to uncertain tax positions are included in accounts payable, accrued expenses, and accrued capital expenditures in the accompanying consolidated balance sheets and the tax liability recorded, including the interest and penalties, was approximately $6.7 million as of December 31, 2013 and 2012. Piedmont recorded no additional expense during the years ended December 31, 2013, 2012, and 2011, respectively, related to such positions. The tax years 2010 to 2013 remain open to examination by various federal and state taxing authorities.

Quarterly_Results_unaudited

Quarterly Results (unaudited)	12 Months Ended
	Dec. 31, 2013
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, 2013 and 2012, is presented below (in thousands, except per-share data). The amounts presented may have been restated from previous period presentations due to reclassifications related to discontinued operations (see Note 14 for further detail).
		2013
		First			Second		Third		Fourth
	Revenues	$	133,293		$	133,713	$	144,631	$	142,868
	Real estate operating income	$	37,781		$	32,863	$	35,563	$	33,981
	Income from continuing operations	$	20,365		$	18,279	$	18,688	$	14,158
	Income/(loss) from discontinued operations	$	(5,710	)	$	17,083	$	412	$	15,468
	Net income attributable to Piedmont	$	14,651		$	35,358	$	19,096	$	29,623
	Basic and diluted earnings per share	$	0.09		$	0.21	$	0.12	$	0.18
	Dividends per share	$	0.2		$	0.2	$	0.2	$	0.2
		2012
		First			Second		Third		Fourth
	Revenues	$	129,960		$	130,556	$	132,149	$	132,379
	Real estate operating income	$	33,978		$	34,991	$	33,263	$	33,846
	Income from continuing operations	$	17,707		$	19,579	$	10,222	$	12,633
	Income from discontinued operations	$	19,524		$	11,133	$	612	$	1,809
	Net income attributable to Piedmont	$	37,228		$	30,708	$	10,830	$	14,438
	Basic and diluted earnings per share	$	0.22		$	0.18	$	0.06	$	0.09
	Dividends per share	$	0.2		$	0.2	$	0.2	$	0.2

Guarantor_Financials

Guarantor Financials	12 Months Ended
	Dec. 31, 2013
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, LP (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 principal elimination entries relate to investments in subsidiaries and intercompany balances and transactions, including transactions with the Non-Guarantor Subsidiaries. Additionally, certain reclassifications have been made to the statements presented below to reflect investments in subsidiaries, which had previously been presented on a net basis, on a gross basis. As all investments in subsidiaries are eliminated in consolidation, none of these reclassifications affect the total financial position or net income attributable to Piedmont as presented in previous periods.
	Condensed Consolidated Balance Sheets
	As of December 31, 2013
	(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Assets:
	Real estate assets, at cost:
	Land	$	88,054		$	—		$	600,707		$	—		$	688,761
	Buildings and improvements, less accumulated depreciation	477,712			—			2,687,163			(300		)	3,164,575
	Intangible lease assets, less accumulated amortization	2,356			—			72,021			—			74,377
	Construction in progress	4,627			—			19,643			—			24,270
	Total real estate assets	572,749			—			3,379,534			(300		)	3,951,983
	Investments in and amounts due from unconsolidated joint ventures	14,388			—			—			—			14,388
	Cash and cash equivalents	3,352			150			3,471			—			6,973
	Tenant and straight-line receivables, net	36,142			—			134,409			—			170,551
	Advances to affiliates	5,312,384			1,288,547			—			(6,600,931		)	—
	Investment in subsidiary	—			4,003,806			197			(4,004,003		)	—
	Notes receivable	160,000			2,000			23,890			(185,890		)	—
	Prepaid expenses, restricted cash, escrows, and other assets	5,319			44			20,779			(977		)	25,165
	Goodwill	180,097			—			—			—			180,097
	Interest rate swap	24,176			—			—			—			24,176
	Deferred financing costs, net	7,764			—			995			—			8,759
	Deferred lease costs, net	34,413			—			249,583			—			283,996
	Total assets	$	6,350,784		$	5,294,547		$	3,812,858		$	(10,792,101	)	$	4,666,088
	Liabilities:
	Debt	$	1,038,570		$	—		$	1,149,525		$	(185,890	)	$	2,002,205
	Accounts payable, accrued expenses, and accrued capital expenditures	13,824			2,376			113,595			(977		)	128,818
	Advances from affiliates	312,881			4,863,672			1,467,334			(6,643,887		)	—
	Deferred income	5,086			—			17,181			—			22,267
	Intangible lease liabilities, net	—			—			47,113			—			47,113
	Interest rate swaps	4,526			—			—			—			4,526
	Total liabilities	1,374,887			4,866,048			2,794,748			(6,830,754		)	2,204,929
	Stockholders’ Equity:
	Common stock	—			1,575			—			—			1,575
	Additional paid-in capital	4,003,806			3,668,906			197			(4,004,003		)	3,668,906
	Cumulative distributions in excess of earnings	951,813			(3,241,982		)	1,016,304			42,656			(1,231,209		)
	Other comprehensive loss	20,278			—			—			—			20,278
	Piedmont stockholders’ equity	4,975,897			428,499			1,016,501			(3,961,347		)	2,459,550
	Noncontrolling interest	—			—			1,609			—			1,609
	Total stockholders’ equity	4,975,897			428,499			1,018,110			(3,961,347		)	2,461,159
	Total liabilities and stockholders’ equity	$	6,350,784		$	5,294,547		$	3,812,858		$	(10,792,101	)	$	4,666,088
	Condensed Consolidated Balance Sheets
	As of December 31, 2012
	(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Assets:
	Real estate assets, at cost:
	Land	$	93,967		$	—		$	535,569		$	—		$	629,536
	Buildings and improvements, less accumulated depreciation	528,548			—			2,379,530			—			2,908,078
	Intangible lease assets, less accumulated amortization	3,266			—			51,479			—			54,745
	Construction in progress	1,056			—			19,317			—			20,373
	Total real estate assets	626,837			—			2,985,895			—			3,612,732
	Investments in and amounts due from unconsolidated joint ventures	37,689			—			—			—			37,689
	Cash and cash equivalents	62,371			239			(49,653		)	—			12,957
	Tenant and straight-line rent receivables, net	34,288			—			113,049			—			147,337
	Advances to affiliates	4,623,173			1,300,158			—			(5,923,331		)	—
	Investment in subsidiary	—			4,068,844			200			(4,069,044		)	—
	Notes receivable	160,000			2,500			23,890			(186,390		)	—
	Prepaid expenses, restricted cash, escrows, and other assets	5,149			14			17,402			(948		)	21,617
	Goodwill	180,097			—			—			—			180,097
	Interest rate swap	1,075			—			—			—			1,075
	Deferred financing costs, net	4,292			—			2,162			—			6,454
	Deferred lease costs, net	30,426			—			204,491			—			234,917
	Total assets	$	5,765,397		$	5,371,755		$	3,297,436		$	(10,179,713	)	$	4,254,875
Liabilities:
Debt	$	452,890		$	—		$	1,150,025		$	(186,390	)	$	1,416,525
Accounts payable, accrued expenses, and accrued capital expenditures	20,443			645			107,123			(948		)	127,263
Advances from affiliates	274,159			4,636,936			1,044,446			(5,955,541		)	—
Deferred income	5,991			—			15,561			—			21,552
Intangible lease liabilities, net	24			—			40,781			—			40,805
Interest rate swaps	8,235			—			—			—			8,235
Total liabilities	761,742			4,637,581			2,357,936			(6,142,879		)	1,614,380
Stockholders’ Equity:
Common stock	—			1,676			—			—			1,676
Additional paid-in capital	4,068,844			3,667,051			200			(4,069,044		)	3,667,051
Cumulative distributions in excess of earnings	941,971			(2,934,553		)	937,691			32,210			(1,022,681		)
Other comprehensive loss	(7,160		)	—			—			—			(7,160		)
Piedmont stockholders’ equity	5,003,655			734,174			937,891			(4,036,834		)	2,638,886
Noncontrolling interest	—			—			1,609			—			1,609
Total stockholders’ equity	5,003,655			734,174			939,500			(4,036,834		)	2,640,495
Total liabilities and stockholders’ equity	$	5,765,397		$	5,371,755		$	3,297,436		$	(10,179,713	)	$	4,254,875
Condensed Consolidated Statements of Income
For the year ended December 31, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	77,200		$	—		$	375,769		$	(5,282	)	$	447,687
Tenant reimbursements	16,526			—			88,461			(420		)	104,567
Property management fee revenue	—			—			15,360			(13,109		)	2,251
	93,726			—			479,590			(18,811		)	554,505
Expenses:
Property operating costs	41,833			—			200,472			(19,326		)	222,979
Depreciation	23,857			—			98,705			—			122,562
Amortization	5,297			—			40,354			—			45,651
Impairment loss	1,242			—			—			—			1,242
General and administrative	21,011			337			24,927			(24,392		)	21,883
	93,240			337			364,458			(43,718		)	414,317
Real estate operating income/(loss)	486			(337		)	115,132			24,907			140,188
Other income (expense):
Interest expense	(22,242		)	—			(63,900		)	12,559			(73,583		)
Interest income and other income/(expense)	10,630			164			(587		)	(12,559		)	(2,352		)
Litigation settlement recovery	1,250			—			—			—			1,250
Net casualty recoveries/(loss)	(567		)	—			11,128			—			10,561
Equity in loss of unconsolidated joint ventures	(3,676		)	—			—			—			(3,676		)
Loss on consolidation	(898		)	—			—			—			(898		)
	(15,503		)	164			(53,359		)	—			(68,698		)
Income/(loss) from continuing operations	(15,017		)	(173		)	61,773			24,907			71,490
Discontinued operations:
Operating income, excluding impairment loss	1,755			—			608			—			2,363
Impairment loss	(6,402		)	—			—			—			(6,402		)
Gain on sale of real estate assets	15,046			—			16,246			—			31,292
Income from discontinued operations	10,399			—			16,854			—			27,253
Net income/(loss)	(4,618		)	(173		)	78,627			24,907			98,743
Less: Net income attributable to noncontrolling interest	—			—			(15		)	—			(15		)
Net income/(loss) attributable to Piedmont	$	(4,618	)	$	(173	)	$	78,612		$	24,907		$	98,728
Condensed Consolidated Statements of Income
For the year ended December 31, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	72,072		$	—		$	348,713		$	(4,813	)	$	415,972
Tenant reimbursements	17,100			—			89,937			(283		)	106,754
Property management fee revenue	—			—			14,350			(12,032		)	2,318
	89,172			—			453,000			(17,128		)	525,044
Expenses:
Property operating costs	36,486			—			189,665			(17,871		)	208,280
Depreciation	23,456			—			86,903			—			110,359
Amortization	5,524			—			44,038			—			49,562
General and administrative	19,804			294			23,574			(22,907		)	20,765
	85,270			294			344,180			(40,778		)	388,966
Real estate operating income/(loss)	3,902			(294		)	108,820			23,650			136,078
Other income (expense):
Interest expense	(12,530		)	—			(65,001		)	12,508			(65,023		)
Interest income and other income/(expense)	12,226			15			1,100			(12,508		)	833
Litigation settlement expense	(7,500		)	—			—			—			(7,500		)
Net casualty recoveries/(loss)	(5,195		)	—			25			—			(5,170		)
Equity in income of unconsolidated joint ventures	923			—			—			—			923
	(12,076		)	15			(63,876		)	—			(75,937		)
Income/(loss) from continuing operations	(8,174		)	(279		)	44,944			23,650			60,141
Discontinued operations:
Operating income	5,220			—			281			—			5,501
Gain on sale of real estate assets	27,577			—			—			—			27,577
Income from discontinued operations	32,797			—			281			—			33,078
Net income/(loss)	24,623			(279		)	45,225			23,650			93,219
Less: Net income attributable to noncontrolling interest	—			—			(15		)	—			(15		)
Net income/(loss) attributable to Piedmont	$	24,623		$	(279	)	$	45,210		$	23,650		$	93,204
Condensed Consolidated Statements of Income
For the year ended December 31, 2011
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	67,669		$	—		$	343,492		$	(1,450	)	$	409,711
Tenant reimbursements	18,539			—			95,313			(39		)	113,813
Property management fee revenue	—			—			14,474			(12,890		)	1,584
	86,208			—			453,279			(14,379		)	525,108
Expenses:
Property operating costs	40,311			—			177,566			(15,346		)	202,531
Depreciation	21,148			—			79,538			—			100,686
Amortization	4,860			—			49,148			—			54,008
General and administrative	25,029			(50		)	24,570			(24,477		)	25,072
	91,348			(50		)	330,822			(39,823		)	382,297
Real estate operating income/(loss)	(5,140		)	50			122,457			25,444			142,811
Other income (expense):
Interest expense	(8,991		)	—			(70,526		)	13,700			(65,817		)
Interest income and other income/(expense)	11,975			—			4,591			(13,700		)	2,866
Equity in income of unconsolidated joint ventures	1,619			—			—			—			1,619
Gain on consolidation	—			—			1,532			—			1,532
Gain on extinguishment of debt	—			—			1,039			—			1,039
	4,603			—			(63,364		)	—			(58,761		)
Income/(loss) from continuing operations	(537		)	50			59,093			25,444			84,050
Discontinued operations:
Operating income	6,842			—			11,507			—			18,349
Gain on sale of real estate assets	12,152			—			110,505			—			122,657
Income from discontinued operations	18,994			—			122,012			—			141,006
Net income	18,457			50			181,105			25,444			225,056
Less: Net income attributable to noncontrolling interest	—			—			(15		)	—			(15		)
Net income attributable to Piedmont	$	18,457		$	50		$	181,090		$	25,444		$	225,041
Condensed Consolidated Statements of Cash Flows
For the year ended December 31, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net Cash Provided by Operating Activities	$	15,327		$	1,853		$	172,992		$	24,907		$	215,079
Cash Flows from Investing Activities:
Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	(10,382		)	—			(532,088		)	300			(542,170		)
Intercompany note receivable	—			500			—			(500		)	—
Acquisition of unconsolidated joint ventures, net of cash assumed	18,045			—			(32,287		)	—			(14,242		)
Net sales proceeds from wholly-owned properties	50,118			—			45,553			—			95,671
Investments in unconsolidated joint ventures	(793		)	—			—			—			(793		)
Deferred lease costs paid	(10,980		)	—			(23,318		)	—			(34,298		)
Net cash provided by/(used in) investing activities	46,008			500			(542,140		)	(200		)	(495,832		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(4,892		)	—			—			—			(4,892		)
Proceeds from debt	1,085,604			—			—			—			1,085,604
Repayments of debt	(500,000		)	—			—			—			(500,000		)
Intercompany note payable	—			—			(500		)	500			—
Net costs of issuance of common stock	—			(91		)	—			—			(91		)
Repurchases of common stock as part of announced plan	—			(173,551		)	—			—			(173,551		)
Intercompany distributions	(701,066		)	303,486			422,787			(25,207		)	—
Dividends paid and discount on dividend reinvestments	—			(132,286		)	(15		)	—			(132,301		)
Net cash provided by/(used in) financing activities	(120,354		)	(2,442		)	422,272			(24,707		)	274,769
Net increase/(decrease) in cash and cash equivalents	(59,019		)	(89		)	53,124			—			(5,984		)
Cash and cash equivalents, beginning of year	62,371			239			(49,653		)	—			12,957
Cash and cash equivalents, end of year	$	3,352		$	150		$	3,471		$	—		$	6,973
Condensed Consolidated Statements of Cash Flows
For the year ended December 31, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net Cash Provided by Operating Activities	$	32,260		$	2,215		$	162,800		$	23,650		$	220,925
Cash Flows from Investing Activities:
Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	(20,763		)	—			(87,724		)	—			(108,487		)
Intercompany note receivable	—			(2,500		)	—			2,500			—
Net sales proceeds from wholly-owned properties	93,839			—			—			—			93,839
Investments in unconsolidated joint ventures	(136		)	—			—			—			(136		)
Deferred lease costs paid	(4,164		)	—			(44,528		)	—			(48,692		)
Net cash provided by/(used in) investing activities	68,776			(2,500		)	(132,252		)	2,500			(63,476		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,125		)	—			—			—			(3,125		)
Proceeds from debt	409,000			—			—			—			409,000
Repayments of debt	(280,000		)	—			(185,000		)	—			(465,000		)
Intercompany note payable	—			—			2,500			(2,500		)	—
Net costs of issuance of common stock	—			(229		)	—			—			(229		)
Repurchases of common stock as part of announced plan	—			(88,450		)	—			—			(88,450		)
Intercompany distributions	(331,460		)	225,427			129,683			(23,650		)	—
Dividends paid and discount on dividend reinvestments	—			(136,363		)	(15		)	—			(136,378		)
Net cash provided by/(used in) financing activities	(205,585		)	385			(52,832		)	(26,150		)	(284,182		)
Net increase/(decrease) in cash and cash equivalents	(104,549		)	100			(22,284		)	—			(126,733		)
Cash and cash equivalents, beginning of year	166,920			139			(27,369		)	—			139,690
Cash and cash equivalents, end of year	$	62,371		$	239		$	(49,653	)	$	—		$	12,957
Condensed Consolidated Statements of Cash Flows
For the year ended December 31, 2011
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net Cash Provided by Operating Activities	$	34,362		$	2,375		$	204,913		$	25,445		$	267,095
Cash Flows from Investing Activities:
Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	(15,856		)	—			(199,753		)	—			(215,609		)
Intercompany note receivable	—			—			53,000			(53,000		)	—
Cash assumed upon consolidation of variable interest entity	—			—			5,063			—			5,063
Net sales proceeds from wholly-owned properties and consolidated joint venture	31,704			—			260,081			—			291,785
Net sales proceeds received from unconsolidated joint ventures	3,036			—			—			—			3,036
Investments in unconsolidated joint ventures	(151		)	—			—			—			(151		)
Liquidation of noncontrolling interest upon sale of consolidated joint venture	—			—			(95		)	—			(95		)
Deferred lease costs paid	(10,695		)	—			(36,354		)	—			(47,049		)
Net cash provided by/(used in) investing activities	8,038			—			81,942			(53,000		)	36,980
Cash Flows from Financing Activities:
Deferred financing costs paid	(2,717		)	—			(650		)	—			(3,367		)
Proceeds from debt	829,000			—			—			—			829,000
Repayments of debt	(779,000		)	—			(43,875		)	—			(822,875		)
Intercompany note payable	(53,000		)	—			—			53,000			—
Net costs of issuance of common stock	—			(252		)	—			—			(252		)
Repurchases of common stock as part of announced plan	—			(3,244		)	—			—			(3,244		)
Intercompany distributions	68,721			218,322			(261,598		)	(25,445		)	—
Dividends paid and discount on dividend reinvestments	—			(217,958		)	(2,407		)	—			(220,365		)
Net cash provided by/(used in) financing activities	63,004			(3,132		)	(308,530		)	27,555			(221,103		)
Net increase/(decrease) in cash and cash equivalents	105,404			(757		)	(21,675		)	—			82,972
Cash and cash equivalents, beginning of year	61,516			896			(5,694		)	—			56,718
Cash and cash equivalents, end of year	$	166,920		$	139		$	(27,369	)	$	—		$	139,690

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	Subsequent events
	Declaration of Dividend for the First Quarter 2014
	On February 5, 2014, the board of directors of Piedmont declared dividends for the first quarter 2014 in the amount of $0.20 per share on its common stock to stockholders of record as of the close of business on February 28, 2014. Such dividends are to be paid on March 21, 2014.
	Contract signed for sale of 11107 & 11109 Sunset Hills Road
	On January 31, 2014, Piedmont entered into a binding contract to sell 11107 and 11109 Sunset Hills Road in Reston, VA. for $22.6 million. The contract is anticipated to close during the first quarter of 2014.

Schedule_III_Real_Estate_Asset

Schedule III - Real Estate Assets and Accumulated Depreciation	12 Months Ended
	Dec. 31, 2013
SEC Schedule III, Real Estate and Accumulated Depreciation Disclosure [Abstract]	'
Schedule III - Real Estate Assets and Accumulated Depreciation	'
	Piedmont Office Realty Trust, Inc.
	Schedule III - Real Estate and Accumulated Depreciation
	December 31, 2013
	(dollars in thousands)
										Initial Cost														Gross Amount at Which
																								Carried at December 31, 2013
	Description	Location		Ownership			Encumbrances			Land				Buildings and			Total			Costs				Land			Buildings and			Total			Accumulated			Date of		Date		Life on
				Percentage										Improvements						Capitalized							Improvements						Depreciation			Construction		Acquired		which
																				Subsequent													and							Depreciation
																				to													Amortization							and
																				Acquisition																				Amortization
																																								is Computed (in years)
																																								(f)
	3900 DALLAS PARKWAY	Plano, TX		100	%		None			1,456				20,377			21,837			3,050				1,517			23,370			24,887			9,499			1999		12/21/99		0	-	40
	RIVER CORPORATE CENTER	Tempe, AZ		100	%		(a)			—				16,036			16,036			7,340				—			23,376			23,376			7,224			1998		3/29/00		0	-	40
	1441 WEST LONG LAKE ROAD	Troy, MI		100	%		None			2,160				16,776			18,936			(6,501		)		1,202			11,233			12,435			7,326			1999		6/29/00		0	-	40
	1430 ENCLAVE PARKWAY	Houston, TX		100	%		32,100			7,100				37,915			45,015			3,699				5,506			43,208			48,714			16,010			1994		12/21/00		0	-	40
	CRESCENT RIDGE II	Minnetonka, MN		100	%		None			7,700				45,154			52,854			9,149				8,021			53,982			62,003			21,125			2000		12/21/00		0	-	40
	1200 CROWN COLONY DRIVE (c)	Quincy, MA		100	%		20,200			11,042				40,666			51,708			2,738				11,042			43,404			54,446			14,268			1990		7/30/01		0	-	40
	5601 HIATUS ROAD	Tamarac, FL		100	%		None			3,642				10,404			14,046			1,721				3,642			12,125			15,767			3,978			2001		12/21/01		0	-	40
	WINDY POINT I	Schaumburg, IL		100	%		23,400			4,537				31,847			36,384			2,782				4,537			34,629			39,166			11,233			1999		12/31/01		0	-	40
	WINDY POINT II	Schaumburg, IL		100	%		40,300			3,746				55,026			58,772			16,702				3,746			71,728			75,474			18,648			2001		12/31/01		0	-	40
	SARASOTA COMMERCE CENTER II	Sarasota, FL		100	%		None			1,767				20,533			22,300			2,310				2,203			22,407			24,610			7,455			1999		1/11/02		0	-	40
	11695 JOHNS CREEK PARKWAY	Johns Creek, GA		100	%		None			2,080				13,572			15,652			1,833				2,081			15,404			17,485			5,292			2001		3/28/02		0	-	40
	3750 BROOKSIDE PARKWAY	Alpharetta, GA		100	%		None			1,561				14,207			15,768			218				1,561			14,425			15,986			4,548			2001		4/18/02		0	-	40
	2001 NW 64th STREET	Ft. Lauderdale, FL		100	%		(a)			—				7,172			7,172			967				—			8,139			8,139			2,487			2001		4/18/02		0	-	40
	90 CENTRAL STREET	Boxborough, MA		100	%		None			3,642				29,497			33,139			3,001				3,642			32,498			36,140			10,967			2001		5/3/02		0	-	40
	DESERT CANYON 300	Phoenix, AZ		100	%		None			2,602				24,333			26,935			46				2,602			24,379			26,981			7,500			2001		6/4/02		0	-	40
	6031 CONNECTION DRIVE	Irving, TX		100	%		None			3,157				43,656			46,813			3,477				3,157			47,133			50,290			14,040			1999		8/15/02		0	-	40
	6021 CONNECTION DRIVE	Irving, TX		100	%		None			3,157				42,662			45,819			172				3,157			42,834			45,991			12,808			2000		8/15/02		0	-	40
	6011 CONNECTION DRIVE	Irving, TX		100	%		None			3,157				29,034			32,191			2,586				3,157			31,620			34,777			10,338			1999		8/15/02		0	-	40
	BRAKER POINTE III (c)	Austin, TX		100	%		16,500			6,098				34,492			40,590			1				6,099			34,492			40,591			10,387			2001		8/15/02		0	-	40
	CHANDLER FORUM	Chandler, AZ		100	%		None			2,632				—			2,632			19,963				2,779			19,816			22,595			6,908			2003		9/12/02		0	-	40
	2 GATEHALL DRIVE (c)	Parsippany, NJ		100	%		42,700			9,054				96,722			105,776			6,448				9,054			103,170			112,224			29,388			1985		9/27/02		0	-	40
	5601 HEADQUARTERS DRIVE	Plano, TX		100	%		None			3,153				24,602			27,755			2,663				3,153			27,265			30,418			7,591			2001		9/27/02		0	-	40
										Initial Cost														Gross Amount at Which
																								Carried at December 31, 2013
	Description	Location		Ownership			Encumbrances			Land				Buildings and			Total			Costs				Land			Buildings and			Total			Accumulated			Date of		Date		Life on
				Percentage										Improvements						Capitalized							Improvements						Depreciation			Construction		Acquired		which
																				Subsequent													and							Depreciation
																				to													Amortization							and
																				Acquisition																				Amortization
																																								is Computed (in years)
																																								(f)
	TWO INDEPENDENCE SQUARE (c)	Washington, DC		100	%		105,800			52,711				202,702			255,413			49,791				52,711			252,493			305,204			62,617			1991		11/22/02		0	-	40
	ONE INDEPENDENCE SQUARE (c)	Washington, DC		100	%		57,800			29,765				104,814			134,579			3,145				30,562			107,162			137,724			31,167			1991		11/22/02		0	-	40
	2120 WEST END AVENUE (c)	Nashville, TN		100	%		26,800			4,908				59,011			63,919			6,671				5,100			65,490			70,590			19,586			2000		11/26/02		0	-	40
	800 NORTH BRAND BOULEVARD	Glendale, CA		100	%		None			23,605				136,284			159,889			9,288				23,607			145,570			169,177			43,804			1990		12/20/02		0	-	40
	EASTPOINT I	Mayfield		100	%		None			1,485				11,064			12,549			2,221				1,485			13,285			14,770			3,277			2000		1/9/03		0	-	40
		Heights, OH
	EASTPOINT II	Mayfield Heights, OH		100	%		None			1,235				9,199			10,434			1,929				1,235			11,128			12,363			3,544			2000		1/9/03		0	-	40
	150 WEST JEFFERSON	Detroit, MI		100	%		None			9,759				88,364			98,123			3,166				9,759			91,530			101,289			26,218			1989		3/31/03		0	-	40
	US BANCORP CENTER	Minneapolis, MN		100	%		105,000			11,138				175,629			186,767			9,568				11,138			185,197			196,335			50,521			2000		5/1/03		0	-	40
	AON CENTER	Chicago, IL		100	%		225,000			23,267				472,488			495,755			145,536				23,966			617,325			641,291			163,035			1972		5/9/03		0	-	40
	AUBURN HILLS CORPORATE CENTER	Auburn Hills, MI		100	%		None			1,978				16,570			18,548			(8,331		)		1,591			8,626			10,217			3,908			2001		5/9/03		0	-	40
	11107 SUNSET HILLS ROAD	Reston, VA		100	%		None			2,711				17,890			20,601			518				2,711			18,408			21,119			5,692			1985		6/27/03		0	-	40
	11109 SUNSET HILLS ROAD	Reston, VA		100	%		None			1,218				8,038			9,256			(2,723		)		1,218			5,315			6,533			1,644			1984		6/27/03		0	-	40
	9211 CORPORATE BOULEVARD	Rockville, MD		100	%		None			3,019				21,984			25,003			(4,805		)		2,960			17,238			20,198			4,630			1989		7/30/03		0	-	40
	9221 CORPORATE BOULEVARD	Rockville, MD		100	%		None			3,019				21,984			25,003			(2,577		)		2,960			19,466			22,426			4,640			1989		7/30/03		0	-	40
	GLENRIDGE HIGHLANDS TWO	Atlanta, GA		100	%		None			6,662				69,031			75,693			(20,391		)		6,662			48,640			55,302			13,457			2000		8/1/03		0	-	40
	200 BRIDGEWATER CROSSING (c)	Bridgewater, NJ		100	%		40,200			8,182				84,160			92,342			(13,774		)		8,328			70,240			78,568			16,890			2002		8/14/03		0	-	40
	1055 EAST COLORADO BOULEVARD	Pasadena, CA		100	%		29,200			6,495				30,265			36,760			(3,059		)		6,495			27,206			33,701			6,349			2001		8/22/03		0	-	40
	FAIRWAY CENTER II (c)	Brea, CA		100	%		10,700			7,110				15,600			22,710			(2,332		)		7,110			13,268			20,378			3,670			2002		8/29/03		0	-	40
COPPER RIDGE CENTER	Lyndhurst, NJ		100	%		None			6,974				38,714			45,688			(4,701		)		6,974			34,013			40,987			9,645			1989		9/5/03		0	-	40
1901 MAIN STREET	Irvine, CA		100	%		None			6,246				36,455			42,701			(6,157		)		6,246			30,298			36,544			7,673			2001		9/17/03		0	-	40
400 VIRGINIA AVE	Washington, DC		100	%		None			22,146				49,740			71,886			(1,248		)		22,146			48,492			70,638			12,989			1985		11/19/03		0	-	40
4250 NORTH FAIRFAX DRIVE	Arlington, VA		100	%		None			13,636				70,918			84,554			3,892				13,636			74,810			88,446			23,169			1998		11/19/03		0	-	40
									Initial Cost														Gross Amount at Which
																							Carried at December 31, 2013
Description	Location		Ownership			Encumbrances			Land				Buildings and			Total			Costs				Land			Buildings and			Total			Accumulated			Date of		Date		Life on
			Percentage										Improvements						Capitalized							Improvements						Depreciation			Construction		Acquired		which
																			Subsequent													and							Depreciation
																			to													Amortization							and
																			Acquisition																				Amortization
																																							is Computed (in years)
																																							(f)
1225 EYE STREET (d)	Washington, DC		50	%		57,600			21,959				47,602			69,561			(1,998		)		21,959			45,604			67,563			12,749			1986		11/19/03		0	-	40
1201 EYE STREET (e)	Washington, DC		50	%		82,400			31,985				63,139			95,124			(3,089		)		31,985			60,050			92,035			15,595			2001		11/19/03		0	-	40
1901 MARKET STREET	Philadelphia, PA		100	%		None			13,584				166,683			180,267			31,497				20,829			190,935			211,764			49,364			1987		12/18/03		0	-	40
60 BROAD STREET	New York, NY		100	%		None			32,522				168,986			201,508			3,543				60,708			144,343			205,051			38,111			1962		12/31/03		0	-	40
1414 MASSACHUSETTS AVENUE	Cambridge, MA		100	%		None			4,210				35,821			40,031			2,004				4,365			37,670			42,035			14,586			1873		1/8/04		0	-	40
ONE BRATTLE SQUARE	Cambridge, MA		100	%		None			6,974				64,940			71,914			(3,920		)		7,113			60,881			67,994			25,873			1991		2/26/04		0	-	40
600 CORPORATE DRIVE	Lebanon, NJ		100	%		None			3,934				—			3,934			16,281				3,934			16,281			20,215			5,163			2005		3/16/04		0	-	40
1075 WEST ENTRANCE DRIVE	Auburn Hills,		100	%		None			5,200				22,957			28,157			(313		)		5,207			22,637			27,844			5,552			2001		7/7/04		0	-	40
	MI
3100 CLARENDON BOULEVARD	Arlington, VA		100	%		None			11,700				69,705			81,405			(5,127		)		11,791			64,487			76,278			14,653			1987		12/9/04		0	-	40
9200 CORPORATE BOULEVARD	Rockville, MD		100	%		None			3,730				16,608			20,338			(1,402		)		3,882			15,054			18,936			3,383			1982		12/29/04		0	-	40
400 BRIDGEWATER CROSSING (c)	Bridgewater, NJ		100	%		29,300			10,400				71,052			81,452			(7,442		)		10,400			63,610			74,010			17,839			2002		2/17/06		0	-	40
LAS COLINAS CORPORATE CENTER I	Irving, TX		100	%		17,500			3,912				18,830			22,742			(4,791		)		2,543			15,408			17,951			2,946			1998		8/31/06		0	-	40
LAS COLINAS CORPORATE CENTER II	Irving, TX		100	%		25,025			4,496				29,881			34,377			(4,908		)		2,543			26,926			29,469			5,501			1998		8/31/06		0	-	40
TWO PIERCE PLACE	Itasca, IL		100	%		None			4,370				70,632			75,002			1,996				4,370			72,628			76,998			19,290			1991		12/7/06		0	-	40
2300 CABOT DRIVE	Lisle, IL		100	%		None			4,390				19,549			23,939			(3,558		)		4,390			15,991			20,381			3,908			1998		5/10/07		0	-	40
PIEDMONT POINTE I	Bethesda, MD		100	%		None			11,200				58,606			69,806			7,351				11,200			65,957			77,157			10,566			2007		11/13/07		0	-	40
PIEDMONT POINTE II	Bethesda, MD		100	%		None			13,300				70,618			83,918			6,638				13,300			77,256			90,556			11,059			2008		6/25/08		0	-	40
SUWANEE GATEWAY ONE	Suwanee, GA		100	%		None			1,000				6,875			7,875			78				1,000			6,953			7,953			581			2008		9/28/10		0	-	40
ONE MERIDIAN CROSSINGS	Richfield, MN		100	%		None			2,919				24,398			27,317			(1		)		2,919			24,397			27,316			2,238			1997		10/1/10		0	-	40
TWO MERIDIAN CROSSINGS	Richfield, MN		100	%		None			2,661				25,742			28,403			215				2,661			25,957			28,618			2,394			1998		10/1/10		0	-	40
500 W. MONROE	Chicago, IL		100	%		None			36,990				185,113			222,103			4,038				36,990			189,151			226,141			13,115			1991		3/31/11		0	-	40
THE DUPREE	Atlanta, GA		100	%		None			4,080				14,310			18,390			420				4,080			14,730			18,810			1,708			1997		4/29/11		0	-	40
THE MEDICI	Atlanta, GA		100	%		None			1,780				11,510			13,290			630				1,780			12,140			13,920			853			2008		6/7/11		0	-	40
225 PRESIDENTIAL WAY	Boston, MA		100	%		None			3,626				36,916			40,542			(763		)		3,613			36,166			39,779			3,566			2000		9/13/11		0	-	40
235 PRESIDENTIAL WAY	Boston, MA		100	%		None			4,154				44,048			48,202			(911		)		4,138			43,153			47,291			4,238			2001		9/13/11		0	-	40
400 TOWNPARK	Lake Mary, FL		100	%		None			2,570				20,555			23,125			620				2,570			21,175			23,745			1,597			2008		11/10/11		0	-	40
									Initial Cost														Gross Amount at Which
																							Carried at December 31, 2013
Description	Location		Ownership			Encumbrances			Land				Buildings and			Total			Costs				Land			Buildings and			Total			Accumulated			Date of		Date		Life on
			Percentage										Improvements						Capitalized							Improvements						Depreciation			Construction		Acquired		which
																			Subsequent													and							Depreciation
																			to													Amortization							and
																			Acquisition																				Amortization
																																							is Computed (in years)
																																							(f)
ARLINGTON GATEWAY	Arlington, VA		100	%		None			36,930				129,070			166,000			(333		)		36,930			128,737			165,667			5,350			2005		3/4/13		0		40
5 & 15 WAYSIDE ROAD	Burlington, MA		100	%		None			7,190				55,445			62,635			(631		)		7,190			54,814			62,004			1,579			1999 / 2001		3/22/13		0		40
2020 W. 89th STREET	Kansas City, MO		100	%		None			1,430				1,607			3,037			234				1,430			1,841			3,271			65			1992		8/12/13		0		40
5301 MARYLAND WAY	Brentwood, TN		100	%		None			5,740				9,717			15,457			—				5,740			9,717			15,457			589			1989		8/12/13		0		40
4685 INVESTMENT DRIVE	Troy, MI		100	%		None			1,200				7,840			9,040			135				1,200			7,975			9,175			309			2000		8/12/13		0		40
6565 MACARTHUR BOULEVARD	Irving, TX		100	%		None			4,820				37,767			42,587			2				4,820			37,769			42,589			71			1998		12/5/13		0		40
ONE LINCOLN PARK	Dallas, TX		100	%		None			6,640				44,810			51,450			—				6,640			44,810			51,450			86			1999		12/20/13		0		40
161 CORPORATE CENTER	Irving, TX		100	%		None			2,020				10,680			12,700			—				2,020			10,680			12,700			19			1998		12/30/13		0		40
PIEDMONT POWER, LLC (g)	Bridgewater, NJ		100	%		None			—				79			79			2,501				—			2,580			2,580			113			N/A		12/20/11		0	-	40
UNDEVELOPED LAND PARCELS (b)	Various		100	%		None			6,021				427			6,448			6,291				12,063			676			12,739			—			N/A		Various				N/A
Total—Consolidated REIT Properties									$	650,349			$	4,058,105		$	4,708,454		$	295,283			$	688,761		$	4,314,976		$	5,003,737		$	1,051,754
								Initial Cost														Gross Amount at Which Carried at
																						December 31, 2013
Description	Location		Ownership			Encumbrances		Land				Buildings and			Total			Costs				Land			Buildings and			Total			Accumulated			Date of		Date		Life on
			Percentage									Improvements						Capitalized							Improvements						Depreciation			Construction		Acquired		which
																		Subsequent													and							Depreciation
																		to													Amortization							and
																		Acquisition																				Amortization
																																						is Computed (in years)
																																						(f)
8560 UPLAND DRIVE	Parker, CO		72	%		None		1,954				11,216			13,170			1,089				2,048			12,211			14,259			3,952			2001		12/21/01		0	-	40
TWO PARK CENTER	Hoffman Estates, IL		72	%		None		600				22,682			23,282			(3,273		)		624			19,385			20,009			5,179			1999		9/19/03		0	-	40
Total – Unconsolidated JV Properties								$	2,554			$	33,898		$	36,452		$	(2,184	)		$	2,672		$	31,596		$	34,268		$	9,131
Total – All Properties								$	652,903			$	4,092,003		$	4,744,906		$	293,099			$	691,433		$	4,346,572		$	5,038,005		$	1,060,885
(a)	Property is owned subject to a long-term ground lease.
(b)	Undeveloped Land Parcels are not included in Piedmont’s total building count.
(c)	These properties collateralize the $350 Million Secured Pooled Facility.
(d)	Piedmont purchased all of the membership interest in 1225 Equity, LLC, which own a 49.5% membership interest in 1225 Eye Street, N.W. Associates, which owns the 1225 Eye Street building. As a result of its ownership of 1225 Equity, LLC, Piedmont owns an approximate 49.5% in the 1225 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.
(e)	Piedmont purchased all of the membership interest in 1201 Equity, LLC, which own a 49.5% membership interest in 1201 Eye Street, N.W. Associates, which owns the 1201 Eye Street building. As a result of its ownership of 1201 Equity, LLC, Piedmont owns an approximate 49.5% in the 1201 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.
(f)	Piedmont’s assets are depreciated or amortized using the straight-lined method over the useful lives of the assets by class. Generally, Tenant Improvements are amortized over the shorter of economic life or lease term, 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.
(g)	Represents solar panels at the 400 Bridgewater Crossing building, which are not included in Piedmont’s total building count.
Piedmont Office Realty Trust, Inc.
Schedule III - Real Estate and Accumulated Depreciation
December 31, 2013
(dollars in thousands)
	2013				2012				2011
Real Estate:
Balance at the beginning of the year	$	4,648,904			$	4,699,311			$	4,666,188
Additions to/improvements of real estate	541,701				108,131				440,141
Assets disposed	(133,249		)		(77,768		)		(361,397		)
Assets impaired	(1,242		)		—				—
Write-offs of intangible assets(1)	(12,080		)		(73,632		)		(35,916		)
Write-offs of fully depreciated/amortized assets	(6,029		)		(7,138		)		(9,705		)
Balance at the end of the year	$	5,038,005			$	4,648,904			$	4,699,311
Accumulated Depreciation and Amortization:
Balance at the beginning of the year	$	977,768			$	935,716			$	918,578
Depreciation and amortization expense	140,637				139,196				147,440
Assets disposed	(39,411		)		(16,374		)		(84,681		)
Write-offs of intangible assets(1)	(12,080		)		(73,632		)		(35,916		)
Write-offs of fully depreciated/amortized assets	(6,029		)		(7,138		)		(9,705		)
Balance at the end of the year	$	1,060,885			$	977,768			$	935,716
(1)	Consists of write-offs of intangible lease assets related to lease restructurings, amendments and terminations.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Use of Estimates, Policy	'
	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, Policy	'
	Real Estate Assets
	Real estate assets are stated at cost, as adjusted for any impairment, less accumulated depreciation. Amounts capitalized to real estate assets consist of the cost of acquisition or construction, any tenant improvements or major improvements, and betterments that extend the useful life of the related asset. All repairs and maintenance are expensed as incurred. Additionally, Piedmont capitalizes interest while the development of a real estate asset is in progress. Approximately $31,000, $0, and $0 of interest was capitalized for the years ended December 31, 2013, 2012, and 2011, 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 improvements	Shorter of economic life or 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. When indicators of potential impairment are present for wholly-owned properties, 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 with the estimated fair values, less costs to sell, for assets held for sale. Piedmont generally considers assets to be held for sale at the point at which a sale contract is executed and earnest money has become non-refundable. 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).
	For properties owned as part of an investment in unconsolidated joint ventures, Piedmont assesses the fair value of its investment as compared to its carrying amount. If Piedmont determines that the carrying value is greater than the 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 fair value amount.
Allocation of Purchase Price of Acquired Assets, Policy	'
	Allocation of Purchase Price of Acquired Assets
	Upon the acquisition of real properties, Piedmont allocates the purchase price of properties to acquired 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 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 fair value of these assets. Management determines the as-if-vacant 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, including leasing commissions and other related costs. In estimating carrying costs, management includes real estate taxes, insurance, and other operating expenses during the expected lease-up periods based on current market conditions.
	The 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 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 Unconsolidated Joint Ventures, Policy	'
	Investments in Unconsolidated Joint Ventures
	Piedmont’s investments in unconsolidated joint ventures are 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" impairments, if any, attributable to such joint ventures. Pursuant to the terms of the unconsolidated joint venture agreements, all income and distributions are allocated to the joint venture partners in accordance with their respective ownership interests. Distributions of net cash from operations are generally distributed to the joint venture partners on a quarterly basis, and are classified as cash inflows from operating activities, as they are presumed to be returns on Piedmont’s investment in the respective 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.
Cash and Cash Equivalents, Policy	'
	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 are stated at cost, which approximates fair value, and consist of investments in money market accounts.
Tenant Receivables Net, Policy	'
	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 represent 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 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. Piedmont adjusted the allowance for doubtful accounts by recording provisions for/(recoveries of) bad debts of approximately $0.2, $0, and ($0.4) million for the years ended December 31, 2013, 2012, and 2011, respectively, which are included in general and administrative expenses in the accompanying consolidated statements of income.
Due from Unconsolidated Joint Ventures, Policy	'
	Due from Unconsolidated Joint Ventures
	Due from unconsolidated joint ventures represents operating distributions due to Piedmont from its investments in unconsolidated joint ventures which have been declared but not received as of period end.
Restricted Cash and Escrows, Policy	'
	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, Policy	'
	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 space, net of accumulated depreciation.
	Prepaid expenses and other assets will be expensed as utilized or reclassified to other asset accounts upon being put into service in future periods. 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, Policy	'
	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 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. Fair value is determined by adjusting the trading price of the stock for various factors including, but not limited to: (i) liquidity or transferability considerations, (ii) control premiums, and/or (iii) fully distributed premiums, if necessary, multiplied by the common shares outstanding. If such calculated 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 fair value of all tangible and intangible net assets of the entity from the entity’s fair value calculated in step one of the test. If the implied value of the goodwill (the remainder left after deducting the fair values of the entity from its calculated overall fair value in step one of the test) is less than the carrying value of goodwill, an impairment loss would be recognized.
Interest Rate Derivatives, Policy	'
	Interest Rate Derivatives
	Piedmont periodically enters into interest rate derivative agreements to hedge its exposure to changing interest rates. Piedmont records all derivatives on the balance sheet at 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 also to determine if the forecasted transactions remain highly probable. Currently, Piedmont does not use derivatives for trading or speculative purposes.
	The changes in 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. Changes in the fair values of derivatives designated as cash flow hedges that do not qualify for hedge accounting treatment, if any, would be recorded as gain/(loss) on interest rate swap in the consolidated statements of income. The 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 interest expense in the consolidated income statements as incurred. All of Piedmont's interest rate derivative agreements as of December 31, 2013 are designated as cash flow hedges.
Deferred Costs, Policy	'
	Deferred Financing Costs
	Deferred financing costs are comprised of costs incurred in connection with securing financing from third-party lenders including amounts paid directly to lenders and are capitalized and amortized 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 deferred financing costs for the years ended December 31, 2013, 2012, and 2011 of approximately $2.6 million, $2.6 million, and $3.2 million, respectively, which is included in interest expense in the accompanying consolidated statements of income.
	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, 2013, 2012, or 2011, Piedmont capitalized approximately $0.1 million, $0, and $0, respectively, of internal leasing 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 $34.0 million, $29.8 million, and $30.0 million of deferred lease costs for the years ended December 31, 2013, 2012, and 2011, respectively, are included in amortization expense; and
	•	Approximately $3.5 million, $2.5 million, and $3.7 million, of deferred lease costs related to lease incentives granted to tenants for the years ended December 31, 2013, 2012, and 2011, respectively, was included as an offset to rental income.
	Upon receipt of a lease termination notice, Piedmont adjusts any unamortized deferred lease costs to their net realizable value 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, Policy	'
	Debt
	When mortgage debt is assumed upon the acquisition of real property, Piedmont adjusts the loan to 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.
Deferred Income, Policy	'
	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.
Stockholders' Equity, Policy	'
	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. On October 31, 2013, the board of directors of Piedmont authorized the repurchase and retirement of up to $150 million of Piedmont's common stock through October 2015. Piedmont may repurchase the shares from time to time, in accordance with applicable securities laws, in the open market or in privately negotiated transactions. Repurchases will depend 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, 2013, approximately $89.8 million is available for share repurchases through October 2015.
	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 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, Policy	'
	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) attributable 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 attributable to noncontrolling interest in the accompanying consolidated statements of income.
Revenue Recognition, Policy	'
	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, Policy	'
	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 and a multi-year performance share component. Awards granted pursuant to the annual restricted stock component are considered equity awards and expensed straight-line over the vesting period, with issuances recorded as a reduction to additional paid in capital. Awards granted pursuant to the performance share component are considered liability awards and 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. Additionally, Piedmont has adopted a nonqualified deferred compensation plan which allows certain employees to elect to defer their receipt of compensation, including but not limited to any stock-based compensation, until future taxable years.
Legal Fees, Policy	'
	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.
Net Casualty Loss/(Gain), Policy	'
	Net Casualty Loss/(Gain)
	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. 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 insurance recoveries related to such losses, if applicable, are recorded as income in the period receipt is determined to be probable. Insurance recoveries in excess of losses recognized or related to business interruption are recorded as income in the period that the insurance company definitively notifies Piedmont of its intent to issue payment. During the years ended December 31, 2013, 2012, and 2011, Piedmont recognized $1.5 million, $0, and $0 in business interruption insurance recoveries, respectively. Casualty losses are presented net of insurance recovery income recorded during the period. During the years ended December 31, 2013 and 2012, substantially all of the net casualty loss recorded related to losses incurred in Piedmont's New York/New Jersey portfolio as a result of Hurricane Sandy which occurred in October 2012.
Net Income Available to Common Stockholders Per Share, Policy	'
	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. Outstanding stock options have been excluded from the diluted earnings per share calculation, as their impact would be anti-dilutive.
Income Tax, Policy	'
	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. Accordingly, neither a provision nor a benefit for federal income taxes has been made in the accompanying consolidated financial statements. 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. Additionally, Piedmont conducts certain operations through its taxable REIT subsidiary, Piedmont Office Holdings, Inc.
Reclassifications, Policy	'
	Reclassifications
	Certain prior period amounts have been reclassified to conform to the current period financial statement presentation. The reclassifications relate to the required presentation of income from discontinued operations for properties sold during the years ended December 31, 2013, 2012, and 2011 (see Note 14), as well as reclassifying deferred common area maintenance costs from deferred lease costs to prepaid and other assets. None of these reclassifications affect net income or net equity attributable to Piedmont as presented in previous periods.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
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 improvements	Shorter of economic life or 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 recorded at acquisition as of December 31, 2013 and 2012, respectively, are as follows (in thousands):
		31-Dec-13		December 31, 2012
	Intangible Lease Assets:
	Above-Market In-Place Lease Assets	$	21,137	$	21,468
	Absorption Period Costs	$	125,060	$	101,217
	Intangible Lease Origination Costs (included in Deferred Lease Costs)	$	158,427	$	116,995
	Intangible Lease Liabilities (Below-Market In-Place Leases)	$	91,369	$	81,736
Amortization Of Intangible Lease Costs	'
	For the years ended December 31, 2013, 2012, and 2011, respectively, Piedmont recognized amortization of intangible lease costs as follows (in thousands):
		2013		2012		2011
	Amortization expense related to Intangible Lease Origination Costs and Absorption Period Costs	$	30,409	$	36,151	$	48,013
	Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	$	5,278	$	5,678	$	7,065
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense	'
	Net intangible assets and liabilities as of December 31, 2013 will be amortized as follows (in thousands):
		Intangible Lease Assets
		Above-Market		Absorption		Intangible Lease		Below-Market
		In-place		Period Costs		Origination Costs(1)		In-place Lease
		Lease Assets						Liabilities
	For the year ending December 31:
	2014	$	2,050	$	15,046	$	18,882	$	6,825
	2015	1,891		13,789		17,490		6,328
	2016	1,662		10,996		14,652		6,205
	2017	886		8,241		11,671		6,300
	2018	309		5,687		8,726		5,702
	Thereafter	131		13,689		21,449		15,753
		$	6,929	$	67,448	$	92,870	$	47,113
	Weighted-Average Amortization Period (in years)	4		6		6		8
	-1	Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets.

Unconsolidated_Joint_Ventures_

Unconsolidated Joint Ventures (Tables)	12 Months Ended
	Dec. 31, 2013
Equity Method Investments and Joint Ventures [Abstract]	'
Schedule of Equity Method Investments	'
	As of December 31, 2013 and 2012, Piedmont owned interests in the following unconsolidated joint ventures (in thousands):
	Name of Joint Venture		Properties Held by Joint Venture	Piedmont’s		Net Book Value
				Approximate
				Ownership
				Percentage
						2013		2012
	Fund XIII and REIT Joint Venture		8560 Upland Drive	72	%	$	14,122	$	18,814
			Two Park Center
	Fund XII and REIT Joint Venture	(1)	4685 Investment Drive	55	%	—		15,813
			5301 Maryland Way
	Fund XI, XII and REIT Joint Venture	(1)	2020 W. 89th Street	57	%	—		2,599
						$	14,122	$	37,226
	(1)	On August 12, 2013, Piedmont purchased all of the remaining interests in three office properties previously held through these two unconsolidated joint ventures for approximately $14.7 million in cash, representing the estimated fair value of the respective property, less Piedmont's existing investment in the respective unconsolidated joint ventures. Such estimated fair value was derived by reference to a credible, unrelated third-party offer and verified using discounted cash flow analysis. Under the terms of the respective joint venture agreements, Piedmont exercised its dissenter's right to buy out each of its co-venturers' interests based upon the terms of the third-party offer. The $0.9 million difference between the fair value of the properties acquired and the sum of Piedmont's previously recorded book value in investment in unconsolidated joint ventures plus cash consideration paid for the interests was recorded as a loss on consolidation in Piedmont's consolidated statement of operations for the year ended December 31, 2013.

Debt_Tables

Debt (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Schedule of Debt	'
	The following table summarizes the terms of Piedmont’s indebtedness outstanding as of December 31, 2013 and 2012 (in thousands):
	Facility		Collateral	Rate(1)			Maturity		Amount Outstanding
									as of December 31,
									2013			2012
	Secured (Fixed)
	$200.0 Million Mortgage Note		Aon Center	4.87	%		5/1/14		$	200,000	(10)	$	200,000
	$25.0 Million Mortgage Note		Aon Center	5.7	%		5/1/14		25,000		(10)	25,000
	$350.0 Million Secured Pooled Facility		Nine Property Collateralized Pool(2)	4.84	%		6/7/14		350,000			350,000
	$105.0 Million Fixed-Rate Loan		US Bancorp Center	5.29	%		5/11/15		105,000			105,000
	$125.0 Million Fixed-Rate Loan		Four Property Collateralized Pool(3)	5.5	%		4/1/16		125,000			125,000
	$42.5 Million Fixed-Rate Loan		Las Colinas Corporate Center I & II	5.7	%		10/11/16		42,525			42,525
	$140.0 Million WDC Mortgage Notes		1201 & 1225 Eye Street	5.76	%		11/1/17		140,000			140,000
	Subtotal/Weighted Average(4)			5.17	%				987,525			987,525
	Unsecured (Variable and Fixed)
	$300 Million Unsecured 2011 Term Loan			LIBOR +  1.45%		(5)	11/22/16		300,000			300,000
	$500 Million Unsecured Line of Credit			1.35	%	(6)	8/19/16	(7)	366,000			129,000
	$350 Million Senior Notes			3.4	%	(8)	6/1/23		348,680			—
	$300 Million Unsecured 2013 Term Loan			LIBOR + 1.20%		(9)	1/31/19		—			—
	Subtotal/Weighted Average(4)			2.46	%				1,014,680			429,000
	Total/ Weighted Average(4)			3.8	%				$	2,002,205		$	1,416,525
	(1)	All of Piedmont’s outstanding debt as of December 31, 2013 and 2012 is interest-only debt.
	(2)	Nine property collateralized pool includes:1200 Crown Colony Drive in Quincy, Massachusetts, Braker Pointe III in Austin, Texas, 2 Gatehall Drive in Parsippany, New Jersey, the One and Two Independence Square buildings in Washington, DC, 2120 West End Avenue in Nashville, Tennessee, 400 Bridgewater Crossing in Bridgewater, New Jersey, 200 Bridgewater Crossing in Bridgewater, New Jersey, and Fairway Center II in Brea, California.
	(3)	Four property collateralized pool includes 1430 Enclave Parkway in Houston, Texas, Windy Point I and II in Schaumburg, Illinois, and 1055 East Colorado Boulevard in Pasadena, California.
	(4)	Weighted average is based on the net book value of outstanding debt and interest rates in the table (or as footnoted) as of December 31, 2013.
	(5)	The $300 Million Unsecured 2011 Term Loan has a stated variable rate; however, Piedmont entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, the rate on this facility to 2.69% through maturity.
	(6)	Piedmont may select from multiple interest rate options with each draw, including the prime rate and various length LIBOR locks. All LIBOR selections are subject to an additional spread (1.175% as of December 31, 2013) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of December 31, 2013 consists of LIBOR draws at an average rate of 0.17% (subject to the additional spread mentioned above). Further, for the year ended December 31, 2013, Piedmont incurred net borrowings of approximately $237.0 million on its outstanding line of credit.
	(7)	Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of August 21, 2017) provided Piedmont is not then in default and upon payment of extension fees.
	(8)	The $350 Million Senior Notes have a fixed coupon rate of 3.40%, however, as a result of the issuance of the notes at a discount, Piedmont recognizes an effective interest rate on this debt issuance of 3.45%.
	(9)	On January 30, 2014, Piedmont drew the full commitment of the $300 Million Unsecured 2013 Term Loan. Additionally, Piedmont entered into four interest rate swap agreements with a total notional value of $200 million to effectively fix the interest rate for this portion of the debt at 2.79%.
	(10)	On January 31, 2014, Piedmont used the proceeds of the $300 Million Unsecured 2013 Term Loan mentioned above to fully repay the $200 Million Mortgage Note and the $25 Million Mortgage Note.
Schedule of Maturities of Long-term Debt	'
	A summary of the aggregate maturities of Piedmont’s indebtedness as of December 31, 2013, is provided below (in thousands):
	2014	$	575,000
	2015	105,000
	2016	833,525		(1)
	2017	140,000
	2018	—
	Thereafter	350,000
	Total	$	2,003,525
	-1	Includes the balance outstanding as of December 31, 2013 of the $500 Million Unsecured 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 August 21, 2017) provided Piedmont is not then in default and upon payment of extension fees.

Variable_Interest_Entities_Tab

Variable Interest Entities (Tables)	12 Months Ended
	Dec. 31, 2013
Variable Interest Entities [Abstract]	'
Schedule of Variable Interest Entities	'
	A summary of Piedmont’s interests in and consolidation treatment of its VIEs as of December 31, 2013 is as follows, (net carrying amount in millions):
	Entity	Piedmont’s		Related	Consolidated/	Net Carrying Amount as of			Net Carrying Amount as of			Primary Beneficiary
		%		Building	Unconsolidated	December 31,			December 31,			Considerations
		Ownership				2013			2012
		of Entity
	1201 Eye Street NW Associates, LLC	49.5	%	1201 Eye	Consolidated	$	(5.3	)	$	(5.7	)	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.
				Street
	1225 Eye Street NW Associates, LLC	49.5	%	1225 Eye	Consolidated	$	(0.9	)	$	(0.1	)	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.
				Street
	Piedmont 500 W. Monroe Fee, LLC	100	%	500 W. Monroe	Consolidated	$	228.3		$	194		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 the economic benefits of the property until such returns are met.
	Suwanee Gateway One, LLC	100	%	Suwanee	Consolidated	$	7.4		$	7.6		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
				Gateway
				One
	Medici Atlanta, LLC	100	%	The Medici	Consolidated	$	14.4		$	13.7		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.
	400 TownPark, LLC	100	%	400 TownPark	Consolidated	$	22.3		$	23.5		The fee agreement includes equity participation rights for the incentive manager, if certain returns on investment are achieved; however, Piedmont has sole decision making authority and is entitled to the economic benefits of the property until such returns are met.

Derivative_Instruments_Tables

Derivative Instruments (Tables)	12 Months Ended
	Dec. 31, 2013
Derivative Instruments [Abstract]	'
Schedule of Notional Amounts of Outstanding Derivative Positions	'
	A detail of Piedmont’s interest rate derivatives outstanding as of December 31, 2013 is as follows:
	Interest Rate Derivatives:	Notional Amount			Effective Date		Maturity Date
		(in millions)
	Interest rate swap	$	125		11/22/11		11/22/16
	Interest rate swap	75			11/22/11		11/22/16
	Interest rate swap	50			11/22/11		11/22/16
	Interest rate swap	50			11/22/11		11/22/16
	Forward starting interest rate swap	70			3/3/14		3/3/24
	Forward starting interest rate swap	70			3/3/14		3/3/24
	Forward starting interest rate swap	70			3/3/14		3/3/24
	Forward starting interest rate swap	70			3/3/14		3/3/24
	Total	$	580
Schedule of Interest Rate Derivatives	'
	A detail of Piedmont’s interest rate derivatives on a gross and net basis as of December 31, 2013 and December 31, 2012, respectively, is as follows (in thousands):
	Interest rate swaps classified as:	December 31, 2013			December 31, 2012
	Gross derivative assets	$	24,176		$	1,075
	Gross derivative liabilities	(4,526		)	(8,235		)
	Net derivative asset/(liability)	$	19,650		$	(7,160	)
Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)	'
	The effective portion of Piedmont's interest rate derivatives that was recorded in the accompanying consolidated statements of income for the years ended December 31, 2013, 2012, and 2011, respectively, was as follows (in thousands):
	Derivative in	2013			2012			2011
	Cash Flow Hedging
	Relationships (Interest Rate Swaps and Caps)
	Amount of loss/(gain) recognized in OCI on derivatives	$	(24,312	)	$	7,656		$	3,064
	Amount of previously recorded loss reclassified from accumulated OCI into interest expense	$	(3,126	)	$	(3,033	)	$	(1,218	)

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Measurement of Financial Instruments [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 of December 31, 2013 and 2012, respectively (in thousands):
		2013					2012
	Financial Instrument	Carrying Value		Estimated		Level Within Fair Value Hierarchy	Carrying Value		Estimated		Level Within Fair Value Hierarchy
				Fair Value					Fair Value
	Assets:
	Cash and cash equivalents(1)	$	6,973	$	6,973	Level 1	$	12,957	$	12,957	Level 1
	Tenant receivables, net(1)	$	31,145	$	31,145	Level 1	$	25,038	$	25,038	Level 1
	Restricted cash and escrows(1)	$	394	$	394	Level 1	$	334	$	334	Level 1
	Interest rate swap asset	$	24,176	$	24,176	Level 2	$	1,075	$	1,075	Level 2
	Liabilities:
	Accounts payable and accrued expenses(1)	$	16,680	$	16,680	Level 1	$	23,113	$	23,113	Level 1
	Interest rate swap liability	$	4,526	$	4,526	Level 2	$	8,235	$	8,235	Level 2
	Debt	$	2,002,205	$	2,004,870	Level 2	$	1,416,525	$	1,470,002	Level 2
	(1)	For the periods presented, the carrying value approximates estimated fair value due to its short-term maturity.

Impairment_of_Certain_Real_Est1

Impairment of Certain Real Estate Assets (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Details of Impairment of Long-Lived Assets Held and Used by Asset	'
	Piedmont recorded the following impairment charges for the years ended December 31, 2013, 2012, and 2011 (in thousands):
		2013		2012		2011
	Impairment losses included in continuing operations:
	Impairment losses recorded in real estate operating expenses:
	11107 and 11109 Sunset Hills Road	$	1,242	$	—	$	—
	Impairment losses recorded in equity in loss of unconsolidated joint ventures:
	Piedmont's Investment in Fund 13 and REIT JV (at Piedmont's approximate 72% ownership)	$	4,402	$	—	$	—
	Impairment losses recorded in discontinued operations:
	1111 Durham Avenue	$	6,402	$	—	$	—

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Schedule of Letters of Credit	'
	As of December 31, 2013, Piedmont was subject to the following letters of credit, which reduce the total outstanding capacity under its $500 Million Unsecured Line of Credit:
	Amount			Expiration of Letter of Credit (1)
	$	1,805,480	(2)	Jul-14
	$	9,033,164	(2)	Jul-14
	$	382,556		Jul-14
	(1)	All of Piedmont's outstanding letter of credit agreements contain an “evergreen” clause, which automatically renews for consecutive, one-year periods each anniversary, subject to certain limitations.
	(2)	These letter of credit agreements were terminated in conjunction with repaying the notes payable secured by the Aon Center building in Chicago, Illinois on February 3, 2014.
Schedule of Future Minimum Rental Payments for Operating Leases	'
	The aggregate payments required under the terms of these operating leases as of December 31, 2013 are presented below (in thousands):
		2014	$	451
		2015	451
		2016	451
		2017	451
		2018	451
		Thereafter	41,071
		Total	$	43,326

Stock_Based_Compensation_Table

Stock Based Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Stock Based Compensation [Abstract]	'
Schedule of Nonvested Share Activity	'
	A rollforward of Piedmont's deferred stock award activity for the year ended December 31, 2013 is as follows:
		Shares		Weighted-Average Grant Date Fair Value
	Unvested Deferred Stock Awards as of December 31, 2012	318,893		$	18.41
	Deferred Stock Awards Granted During Fiscal Year 2013	161,257		$	19.47
	Deferred Stock Awards Vested During Fiscal Year 2013	(209,284	)	$	18.91
	Deferred Stock Awards Forfeited During Fiscal Year 2013	(5,727	)	$	18.62
	Unvested Deferred Stock Awards as of December 31, 2013	265,139		$	18.65
	The following table provides additional information regarding stock award activity during the years ended December 31, 2013, 2012, and 2011 (in thousands except for per share data):
		2013			2012				2011
	Weighted-Average Grant Date Fair Value for Shares Granted During the Year (per share)	$	19.47		$	17.53			$	19.03
	Total Grant Date Fair Value of Shares Vested During the Year	$	3,957		$	5,331			$	5,405
	Share-based Liabilities Paid(1)	$	103		$	798			$	851
	(1)	Amounts reflect the issuance of performance share awards during the period.
Schedule of Outstanding Employee Deferred Stock Awards	'
	A detail of Piedmont’s outstanding employee deferred stock awards as of December 31, 2013 is as follows:
	Date of grant		Type of Award	Net  Shares			Grant				Vesting Schedule	Unvested Shares as of
				Granted (1)			Date Fair					December 31, 2013
							Value
	5-Apr-11		Annual Deferred Stock Award	116,116			$	19.4			Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on April 5, 2012, 2013, and 2014, respectively.	36,835
	5-Apr-11		Fiscal Year 2011-2013 Performance Share Program	—			$	18.27			Shares awarded, if any, will vest immediately upon determination of award in 2014.	—	(2	)
	4-Apr-12		Annual Deferred Stock Award	190,134			$	17.53			Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on April 4, 2013, 2014, and 2015, respectively.	110,184
	4-Apr-12		Fiscal Year 2012-2014 Performance Share Program	—			$	17.42			Shares awarded, if any, will vest immediately upon determination of award in 2015.	—	(2	)
	2-Apr-13		Annual Deferred Stock Award	146,679			$	19.47			Of the shares granted, 25% vested on the date of grant, and 25% of the shares vest on April 2, 2014, 2015, and 2016, respectively.	118,120
	2-Apr-13		Fiscal Year 2013-2015 Performance Share Program	—			$	18.91			Shares awarded, if any, will vest immediately upon determination of award in 2016.	—	(2	)
	Total											265,139
	(1)	Amounts reflect the total grant to employees, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2013.
	(2)	Estimated based on Piedmont's cumulative total stockholder return ("TSR") for the respective performance period through December 31, 2013. As of December 31, 2013, Piedmont's TSR for each of these respective plans was below threshold. Such 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, 2013
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, 2013, 2012, and 2011 (in thousands):
		2013	2012	2011
	Weighted-average common shares—basic	165,013	170,312	172,765
	Plus incremental weighted-average shares resulting from the assumed conversion of time-vested restricted stock awards	124	129	216
	Weighted-average common shares—diluted	165,137	170,441	172,981

Operating_Leases_Tables

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Schedule of Future Minimum Rental Payments for Operating Leases	'
	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, 2013, is presented below (in thousands):
	Years ending December 31:
	2014	$	386,504
	2015	394,329
	2016	372,684
	2017	352,014
	2018	321,294
	Thereafter	1,446,082
	Total	$	3,272,907

Discontinued_Operations_Tables

Discontinued Operations (Tables)	12 Months Ended
	Dec. 31, 2013
Discontinued Operations [Abstract]	'
Schedule of Disposal Groups, Including Discontinued Operations, Results Of Operations	'
	Piedmont has classified the results of operations related to the following properties as discontinued operations (in thousands):
	Building Sold		Location		Date of Sale		Gain/(Loss) on Sale				Net Sales Proceeds
	Eastpointe Corporate Center		Issaquah, Washington		July 1, 2011		$	12,152			$	31,704
	5000 Corporate Court		Holtsville, New York		August 31, 2011		$	14,367			$	36,100
	35 West Wacker Drive	(1)	Chicago, Illinois		December 15, 2011		$	96,138			$	223,981
	Portland Portfolio	(2)	Beaverton, Oregon		March 19, 2012		$	17,823			$	43,832
	26200 Enterprise Way		Lake Forest, California		May 31, 2012		$	10,013			$	24,412
	110 & 112 Hidden Lake Circle Buildings		Duncan, South Carolina		September 21, 2012		$	(259	)		$	25,595
	1111 Durham Avenue		South Plainfield, New Jersey		March 28, 2013		$	(9	)		$	3,752
	1200 Enclave Parkway		Houston, Texas		May 1, 2013		$	16,246			$	45,552
	350 Spectrum Loop		Colorado Springs, Colorado		November 1, 2013		$	7,959			$	29,676
	8700 South Price Road		Tempe, Arizona		December 30, 2013		$	7,096			$	16,691
	(1)	Piedmont sold its approximate 96.5% ownership in the property. Transaction data above is presented at Piedmont's ownership percentage.
	(2)	The Portland Portfolio consisted of four office properties known as the Deschutes building, the Rhein building, the Rogue building, and the Willamette building, as well as 18.19 acres of adjoining, undeveloped land.
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures	'
	The details comprising income from discontinued operations are presented below (in thousands):
		Years Ended December 31,
		2013				2012				2011
	Revenues:
	Rental income	$	4,678			$	13,215			$	45,306
	Tenant reimbursements	757				1,528				20,632
		5,435				14,743				65,938
	Expenses:
	Property operating costs	1,900				5,216				26,243
	Depreciation	1,004				3,291				9,044
	Amortization	209				690				5,995
	General and administrative	2				45				(168		)
		3,115				9,242				41,114
	Other income (expense):
	Interest expense	—				—				(5,931		)
	Interest income and other income/(expense)	26				—				(91		)
	Net casualty recoveries	17				—				—
	Net loss attributable to noncontrolling interest	—				—				(453		)
		43				—				(6,475		)
	Operating income, excluding impairment loss and gain on sale of real estate assets	2,363				5,501				18,349
	Impairment loss	(6,402		)		—				—
	Gain on sale of real estate assets	31,292				27,577				122,657
	Income from discontinued operations	$	27,253			$	33,078			$	141,006

Supplemental_Disclosures_of_No1

Supplemental Disclosures of Noncash Activities (Tables)	12 Months Ended
	Dec. 31, 2013
Supplemental Cash Flow Elements [Abstract]	'
Schedule of Cash Flow, Supplemental Disclosures	'
	Significant noncash investing and financing activities for the years ended December 31, 2013, 2012, and 2011 (in thousands) are outlined below:
		2013		2012			2011
	Accrued capital expenditures and deferred lease costs	$	12,460	$	12,598		$	8,218
	Change in accrued offering costs related to issuance of common stock	$	—	$	(567	)	$	227
	Net assets assumed upon consolidation of variable interest entity, net of notes receivable previously recorded	$	—	$	—		$	188,283
	Liabilities assumed upon consolidation of variable interest entity	$	—	$	—		$	191,814
	Change in accrued share repurchases as part of an announced plan	$	1,718	$	287		$	—

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Tax Basis Income	'
	Piedmont’s income tax basis net income for the years ended December 31, 2013, 2012, and 2011, is calculated as follows (in thousands):
		2013				2012				2011
	GAAP basis financial statement net income	$	98,728			$	93,204			$	225,041
	Increase (decrease) in net income resulting from:
	Depreciation and amortization expense for financial reporting purposes in excess of amounts for income tax purposes	42,374				35,125				47,346
	Rental income accrued for income tax purposes less than amounts for financial reporting purposes	(25,964		)		(10,422		)		(9,380		)
	Net amortization of above/below-market lease intangibles for financial reporting purposes in excess of amounts for income tax purposes	(4,701		)		(5,324		)		(6,605		)
	Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes	(35,153		)		(7,967		)		(66,410		)
	Taxable income of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes	—				2,662				4,515
	Other expenses for financial reporting purposes in excess of amounts for income tax purposes	9,045				14,361				(2,072		)
	Income tax basis net income, prior to dividends paid deduction	$	84,329			$	121,639			$	192,435
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:
		2013			2012			2011
	Ordinary income	64	%		73	%		61	%
	Return of capital	36	%		11	%		12	%
	Capital gains	—	%		16	%		27	%
		100	%		100	%		100	%

Quarterly_Results_unaudited_Ta

Quarterly Results (unaudited) (Tables)	12 Months Ended
	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]	'
Schedule of Quarterly Financial Information	'
	A summary of the unaudited quarterly financial information for the years ended December 31, 2013 and 2012, is presented below (in thousands, except per-share data). The amounts presented may have been restated from previous period presentations due to reclassifications related to discontinued operations (see Note 14 for further detail).
		2013
		First			Second		Third		Fourth
	Revenues	$	133,293		$	133,713	$	144,631	$	142,868
	Real estate operating income	$	37,781		$	32,863	$	35,563	$	33,981
	Income from continuing operations	$	20,365		$	18,279	$	18,688	$	14,158
	Income/(loss) from discontinued operations	$	(5,710	)	$	17,083	$	412	$	15,468
	Net income attributable to Piedmont	$	14,651		$	35,358	$	19,096	$	29,623
	Basic and diluted earnings per share	$	0.09		$	0.21	$	0.12	$	0.18
	Dividends per share	$	0.2		$	0.2	$	0.2	$	0.2
		2012
		First			Second		Third		Fourth
	Revenues	$	129,960		$	130,556	$	132,149	$	132,379
	Real estate operating income	$	33,978		$	34,991	$	33,263	$	33,846
	Income from continuing operations	$	17,707		$	19,579	$	10,222	$	12,633
	Income from discontinued operations	$	19,524		$	11,133	$	612	$	1,809
	Net income attributable to Piedmont	$	37,228		$	30,708	$	10,830	$	14,438
	Basic and diluted earnings per share	$	0.22		$	0.18	$	0.06	$	0.09
	Dividends per share	$	0.2		$	0.2	$	0.2	$	0.2

Guarantor_Financials_Tables

Guarantor Financials (Tables)	12 Months Ended
	Dec. 31, 2013
Guarantor and Non-Guarantor Financial Information [Abstract]	'
Condensed Balance Sheet	'
	Condensed Consolidated Balance Sheets
	As of December 31, 2013
	(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Assets:
	Real estate assets, at cost:
	Land	$	88,054		$	—		$	600,707		$	—		$	688,761
	Buildings and improvements, less accumulated depreciation	477,712			—			2,687,163			(300		)	3,164,575
	Intangible lease assets, less accumulated amortization	2,356			—			72,021			—			74,377
	Construction in progress	4,627			—			19,643			—			24,270
	Total real estate assets	572,749			—			3,379,534			(300		)	3,951,983
	Investments in and amounts due from unconsolidated joint ventures	14,388			—			—			—			14,388
	Cash and cash equivalents	3,352			150			3,471			—			6,973
	Tenant and straight-line receivables, net	36,142			—			134,409			—			170,551
	Advances to affiliates	5,312,384			1,288,547			—			(6,600,931		)	—
	Investment in subsidiary	—			4,003,806			197			(4,004,003		)	—
	Notes receivable	160,000			2,000			23,890			(185,890		)	—
	Prepaid expenses, restricted cash, escrows, and other assets	5,319			44			20,779			(977		)	25,165
	Goodwill	180,097			—			—			—			180,097
	Interest rate swap	24,176			—			—			—			24,176
	Deferred financing costs, net	7,764			—			995			—			8,759
	Deferred lease costs, net	34,413			—			249,583			—			283,996
	Total assets	$	6,350,784		$	5,294,547		$	3,812,858		$	(10,792,101	)	$	4,666,088
	Liabilities:
	Debt	$	1,038,570		$	—		$	1,149,525		$	(185,890	)	$	2,002,205
	Accounts payable, accrued expenses, and accrued capital expenditures	13,824			2,376			113,595			(977		)	128,818
	Advances from affiliates	312,881			4,863,672			1,467,334			(6,643,887		)	—
	Deferred income	5,086			—			17,181			—			22,267
	Intangible lease liabilities, net	—			—			47,113			—			47,113
	Interest rate swaps	4,526			—			—			—			4,526
	Total liabilities	1,374,887			4,866,048			2,794,748			(6,830,754		)	2,204,929
	Stockholders’ Equity:
	Common stock	—			1,575			—			—			1,575
	Additional paid-in capital	4,003,806			3,668,906			197			(4,004,003		)	3,668,906
	Cumulative distributions in excess of earnings	951,813			(3,241,982		)	1,016,304			42,656			(1,231,209		)
	Other comprehensive loss	20,278			—			—			—			20,278
	Piedmont stockholders’ equity	4,975,897			428,499			1,016,501			(3,961,347		)	2,459,550
	Noncontrolling interest	—			—			1,609			—			1,609
	Total stockholders’ equity	4,975,897			428,499			1,018,110			(3,961,347		)	2,461,159
	Total liabilities and stockholders’ equity	$	6,350,784		$	5,294,547		$	3,812,858		$	(10,792,101	)	$	4,666,088
	Condensed Consolidated Balance Sheets
	As of December 31, 2012
	(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Assets:
	Real estate assets, at cost:
	Land	$	93,967		$	—		$	535,569		$	—		$	629,536
	Buildings and improvements, less accumulated depreciation	528,548			—			2,379,530			—			2,908,078
	Intangible lease assets, less accumulated amortization	3,266			—			51,479			—			54,745
	Construction in progress	1,056			—			19,317			—			20,373
	Total real estate assets	626,837			—			2,985,895			—			3,612,732
	Investments in and amounts due from unconsolidated joint ventures	37,689			—			—			—			37,689
	Cash and cash equivalents	62,371			239			(49,653		)	—			12,957
	Tenant and straight-line rent receivables, net	34,288			—			113,049			—			147,337
	Advances to affiliates	4,623,173			1,300,158			—			(5,923,331		)	—
	Investment in subsidiary	—			4,068,844			200			(4,069,044		)	—
	Notes receivable	160,000			2,500			23,890			(186,390		)	—
	Prepaid expenses, restricted cash, escrows, and other assets	5,149			14			17,402			(948		)	21,617
	Goodwill	180,097			—			—			—			180,097
	Interest rate swap	1,075			—			—			—			1,075
	Deferred financing costs, net	4,292			—			2,162			—			6,454
	Deferred lease costs, net	30,426			—			204,491			—			234,917
	Total assets	$	5,765,397		$	5,371,755		$	3,297,436		$	(10,179,713	)	$	4,254,875
	Liabilities:
	Debt	$	452,890		$	—		$	1,150,025		$	(186,390	)	$	1,416,525
Accounts payable, accrued expenses, and accrued capital expenditures	20,443			645			107,123			(948		)	127,263
Advances from affiliates	274,159			4,636,936			1,044,446			(5,955,541		)	—
Deferred income	5,991			—			15,561			—			21,552
Intangible lease liabilities, net	24			—			40,781			—			40,805
Interest rate swaps	8,235			—			—			—			8,235
Total liabilities	761,742			4,637,581			2,357,936			(6,142,879		)	1,614,380
Stockholders’ Equity:
Common stock	—			1,676			—			—			1,676
Additional paid-in capital	4,068,844			3,667,051			200			(4,069,044		)	3,667,051
Cumulative distributions in excess of earnings	941,971			(2,934,553		)	937,691			32,210			(1,022,681		)
Other comprehensive loss	(7,160		)	—			—			—			(7,160		)
Piedmont stockholders’ equity	5,003,655			734,174			937,891			(4,036,834		)	2,638,886
Noncontrolling interest	—			—			1,609			—			1,609
Total stockholders’ equity	5,003,655			734,174			939,500			(4,036,834		)	2,640,495
Total liabilities and stockholders’ equity	$	5,765,397		$	5,371,755		$	3,297,436		$	(10,179,713	)	$	4,254,875
Condensed Income Statement	'
	Condensed Consolidated Statements of Income
	For the year ended December 31, 2013
	(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Revenues:
	Rental income	$	77,200		$	—		$	375,769		$	(5,282	)	$	447,687
	Tenant reimbursements	16,526			—			88,461			(420		)	104,567
	Property management fee revenue	—			—			15,360			(13,109		)	2,251
		93,726			—			479,590			(18,811		)	554,505
	Expenses:
	Property operating costs	41,833			—			200,472			(19,326		)	222,979
	Depreciation	23,857			—			98,705			—			122,562
	Amortization	5,297			—			40,354			—			45,651
	Impairment loss	1,242			—			—			—			1,242
	General and administrative	21,011			337			24,927			(24,392		)	21,883
		93,240			337			364,458			(43,718		)	414,317
	Real estate operating income/(loss)	486			(337		)	115,132			24,907			140,188
	Other income (expense):
	Interest expense	(22,242		)	—			(63,900		)	12,559			(73,583		)
	Interest income and other income/(expense)	10,630			164			(587		)	(12,559		)	(2,352		)
	Litigation settlement recovery	1,250			—			—			—			1,250
	Net casualty recoveries/(loss)	(567		)	—			11,128			—			10,561
	Equity in loss of unconsolidated joint ventures	(3,676		)	—			—			—			(3,676		)
	Loss on consolidation	(898		)	—			—			—			(898		)
		(15,503		)	164			(53,359		)	—			(68,698		)
	Income/(loss) from continuing operations	(15,017		)	(173		)	61,773			24,907			71,490
	Discontinued operations:
	Operating income, excluding impairment loss	1,755			—			608			—			2,363
	Impairment loss	(6,402		)	—			—			—			(6,402		)
	Gain on sale of real estate assets	15,046			—			16,246			—			31,292
	Income from discontinued operations	10,399			—			16,854			—			27,253
	Net income/(loss)	(4,618		)	(173		)	78,627			24,907			98,743
	Less: Net income attributable to noncontrolling interest	—			—			(15		)	—			(15		)
	Net income/(loss) attributable to Piedmont	$	(4,618	)	$	(173	)	$	78,612		$	24,907		$	98,728
	Condensed Consolidated Statements of Income
	For the year ended December 31, 2012
	(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Revenues:
	Rental income	$	72,072		$	—		$	348,713		$	(4,813	)	$	415,972
	Tenant reimbursements	17,100			—			89,937			(283		)	106,754
	Property management fee revenue	—			—			14,350			(12,032		)	2,318
		89,172			—			453,000			(17,128		)	525,044
	Expenses:
	Property operating costs	36,486			—			189,665			(17,871		)	208,280
	Depreciation	23,456			—			86,903			—			110,359
	Amortization	5,524			—			44,038			—			49,562
	General and administrative	19,804			294			23,574			(22,907		)	20,765
		85,270			294			344,180			(40,778		)	388,966
	Real estate operating income/(loss)	3,902			(294		)	108,820			23,650			136,078
	Other income (expense):
	Interest expense	(12,530		)	—			(65,001		)	12,508			(65,023		)
	Interest income and other income/(expense)	12,226			15			1,100			(12,508		)	833
	Litigation settlement expense	(7,500		)	—			—			—			(7,500		)
	Net casualty recoveries/(loss)	(5,195		)	—			25			—			(5,170		)
	Equity in income of unconsolidated joint ventures	923			—			—			—			923
		(12,076		)	15			(63,876		)	—			(75,937		)
	Income/(loss) from continuing operations	(8,174		)	(279		)	44,944			23,650			60,141
	Discontinued operations:
	Operating income	5,220			—			281			—			5,501
	Gain on sale of real estate assets	27,577			—			—			—			27,577
	Income from discontinued operations	32,797			—			281			—			33,078
	Net income/(loss)	24,623			(279		)	45,225			23,650			93,219
	Less: Net income attributable to noncontrolling interest	—			—			(15		)	—			(15		)
	Net income/(loss) attributable to Piedmont	$	24,623		$	(279	)	$	45,210		$	23,650		$	93,204
Condensed Consolidated Statements of Income
For the year ended December 31, 2011
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	67,669		$	—		$	343,492		$	(1,450	)	$	409,711
Tenant reimbursements	18,539			—			95,313			(39		)	113,813
Property management fee revenue	—			—			14,474			(12,890		)	1,584
	86,208			—			453,279			(14,379		)	525,108
Expenses:
Property operating costs	40,311			—			177,566			(15,346		)	202,531
Depreciation	21,148			—			79,538			—			100,686
Amortization	4,860			—			49,148			—			54,008
General and administrative	25,029			(50		)	24,570			(24,477		)	25,072
	91,348			(50		)	330,822			(39,823		)	382,297
Real estate operating income/(loss)	(5,140		)	50			122,457			25,444			142,811
Other income (expense):
Interest expense	(8,991		)	—			(70,526		)	13,700			(65,817		)
Interest income and other income/(expense)	11,975			—			4,591			(13,700		)	2,866
Equity in income of unconsolidated joint ventures	1,619			—			—			—			1,619
Gain on consolidation	—			—			1,532			—			1,532
Gain on extinguishment of debt	—			—			1,039			—			1,039
	4,603			—			(63,364		)	—			(58,761		)
Income/(loss) from continuing operations	(537		)	50			59,093			25,444			84,050
Discontinued operations:
Operating income	6,842			—			11,507			—			18,349
Gain on sale of real estate assets	12,152			—			110,505			—			122,657
Income from discontinued operations	18,994			—			122,012			—			141,006
Net income	18,457			50			181,105			25,444			225,056
Less: Net income attributable to noncontrolling interest	—			—			(15		)	—			(15		)
Net income attributable to Piedmont	$	18,457		$	50		$	181,090		$	25,444		$	225,041
Condensed Cash Flow Statement	'
	Condensed Consolidated Statements of Cash Flows
	For the year ended December 31, 2013
	(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Net Cash Provided by Operating Activities	$	15,327		$	1,853		$	172,992		$	24,907		$	215,079
	Cash Flows from Investing Activities:
	Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	(10,382		)	—			(532,088		)	300			(542,170		)
	Intercompany note receivable	—			500			—			(500		)	—
	Acquisition of unconsolidated joint ventures, net of cash assumed	18,045			—			(32,287		)	—			(14,242		)
	Net sales proceeds from wholly-owned properties	50,118			—			45,553			—			95,671
	Investments in unconsolidated joint ventures	(793		)	—			—			—			(793		)
	Deferred lease costs paid	(10,980		)	—			(23,318		)	—			(34,298		)
	Net cash provided by/(used in) investing activities	46,008			500			(542,140		)	(200		)	(495,832		)
	Cash Flows from Financing Activities:
	Deferred financing costs paid	(4,892		)	—			—			—			(4,892		)
	Proceeds from debt	1,085,604			—			—			—			1,085,604
	Repayments of debt	(500,000		)	—			—			—			(500,000		)
	Intercompany note payable	—			—			(500		)	500			—
	Net costs of issuance of common stock	—			(91		)	—			—			(91		)
	Repurchases of common stock as part of announced plan	—			(173,551		)	—			—			(173,551		)
	Intercompany distributions	(701,066		)	303,486			422,787			(25,207		)	—
	Dividends paid and discount on dividend reinvestments	—			(132,286		)	(15		)	—			(132,301		)
	Net cash provided by/(used in) financing activities	(120,354		)	(2,442		)	422,272			(24,707		)	274,769
	Net increase/(decrease) in cash and cash equivalents	(59,019		)	(89		)	53,124			—			(5,984		)
	Cash and cash equivalents, beginning of year	62,371			239			(49,653		)	—			12,957
	Cash and cash equivalents, end of year	$	3,352		$	150		$	3,471		$	—		$	6,973
	Condensed Consolidated Statements of Cash Flows
	For the year ended December 31, 2012
	(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Net Cash Provided by Operating Activities	$	32,260		$	2,215		$	162,800		$	23,650		$	220,925
	Cash Flows from Investing Activities:
	Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	(20,763		)	—			(87,724		)	—			(108,487		)
	Intercompany note receivable	—			(2,500		)	—			2,500			—
	Net sales proceeds from wholly-owned properties	93,839			—			—			—			93,839
	Investments in unconsolidated joint ventures	(136		)	—			—			—			(136		)
	Deferred lease costs paid	(4,164		)	—			(44,528		)	—			(48,692		)
	Net cash provided by/(used in) investing activities	68,776			(2,500		)	(132,252		)	2,500			(63,476		)
	Cash Flows from Financing Activities:
	Deferred financing costs paid	(3,125		)	—			—			—			(3,125		)
	Proceeds from debt	409,000			—			—			—			409,000
	Repayments of debt	(280,000		)	—			(185,000		)	—			(465,000		)
	Intercompany note payable	—			—			2,500			(2,500		)	—
	Net costs of issuance of common stock	—			(229		)	—			—			(229		)
	Repurchases of common stock as part of announced plan	—			(88,450		)	—			—			(88,450		)
	Intercompany distributions	(331,460		)	225,427			129,683			(23,650		)	—
	Dividends paid and discount on dividend reinvestments	—			(136,363		)	(15		)	—			(136,378		)
	Net cash provided by/(used in) financing activities	(205,585		)	385			(52,832		)	(26,150		)	(284,182		)
	Net increase/(decrease) in cash and cash equivalents	(104,549		)	100			(22,284		)	—			(126,733		)
	Cash and cash equivalents, beginning of year	166,920			139			(27,369		)	—			139,690
	Cash and cash equivalents, end of year	$	62,371		$	239		$	(49,653	)	$	—		$	12,957
	Condensed Consolidated Statements of Cash Flows
	For the year ended December 31, 2011
	(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
	Net Cash Provided by Operating Activities	$	34,362		$	2,375		$	204,913		$	25,445		$	267,095
	Cash Flows from Investing Activities:
	Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	(15,856		)	—			(199,753		)	—			(215,609		)
	Intercompany note receivable	—			—			53,000			(53,000		)	—
	Cash assumed upon consolidation of variable interest entity	—			—			5,063			—			5,063
	Net sales proceeds from wholly-owned properties and consolidated joint venture	31,704			—			260,081			—			291,785
	Net sales proceeds received from unconsolidated joint ventures	3,036			—			—			—			3,036
	Investments in unconsolidated joint ventures	(151		)	—			—			—			(151		)
	Liquidation of noncontrolling interest upon sale of consolidated joint venture	—			—			(95		)	—			(95		)
	Deferred lease costs paid	(10,695		)	—			(36,354		)	—			(47,049		)
	Net cash provided by/(used in) investing activities	8,038			—			81,942			(53,000		)	36,980
Cash Flows from Financing Activities:
Deferred financing costs paid	(2,717		)	—			(650		)	—			(3,367		)
Proceeds from debt	829,000			—			—			—			829,000
Repayments of debt	(779,000		)	—			(43,875		)	—			(822,875		)
Intercompany note payable	(53,000		)	—			—			53,000			—
Net costs of issuance of common stock	—			(252		)	—			—			(252		)
Repurchases of common stock as part of announced plan	—			(3,244		)	—			—			(3,244		)
Intercompany distributions	68,721			218,322			(261,598		)	(25,445		)	—
Dividends paid and discount on dividend reinvestments	—			(217,958		)	(2,407		)	—			(220,365		)
Net cash provided by/(used in) financing activities	63,004			(3,132		)	(308,530		)	27,555			(221,103		)
Net increase/(decrease) in cash and cash equivalents	105,404			(757		)	(21,675		)	—			82,972
Cash and cash equivalents, beginning of year	61,516			896			(5,694		)	—			56,718
Cash and cash equivalents, end of year	$	166,920		$	139		$	(27,369	)	$	—		$	139,690

Organization_Details

Organization (Details)	12 Months Ended
	Dec. 31, 2013	Aug. 12, 2013
	subsidiary	property
Real Estate Properties [Line Items]	'	'
Number of wholly owned subsidiaries	2	'
Percentage ownership by sole general partner	99.90%	'
Percentage ownership by sole limited partner	0.10%	'
Number of real estate properties	'	3
Percentage of annualized lease revenue	90.00%	'
Unconsolidated Joint Venture [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of real estate properties	2	'
Office properties [Member]	'	'
Real Estate Properties [Line Items]	'	'
Number of real estate properties	78	'
Rentable Square Feet (Unaudited)	21,500,000	'
Percentage of Class A commercial office space	87.20%	'

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011	Aug. 12, 2013
	Lawsuit				property
Significant Accounting Policies [Line Items]	'		'	'	'
Number of real estate properties	'		'	'	3
Interest capitalized	$31,000		$0	$0	'
Intangible Lease Liabilities (Below-Market In-Place Leases)	91,369,000		'	81,736,000	'
Amortization expense related to Intangible Lease Origination Costs and Absorption Period Costs	30,409,000		36,151,000	48,013,000	'
Amortization of Above-Market and Below-Market In-Place Lease intangibles as a net increase to rental revenues	5,278,000		5,678,000	7,065,000	'
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'	'	'
Total	74,377,000		54,745,000	'	'
2014	6,825,000		'	'	'
2015	6,328,000		'	'	'
2016	6,205,000		'	'	'
2017	6,300,000		'	'	'
2018	5,702,000		'	'	'
Thereafter	15,753,000		'	'	'
Total	47,113,000		'	'	'
Weighted-Average Amortization Period (in years)	'8 years		'	'	'
Provision for doubtful accounts	200,000		0	'	'
Recoveries of bad debts	'		'	-400,000	'
Amortization of deferred financing costs and fair market value adjustments on notes payable	2,600,000		2,600,000	3,200,000	'
Capitalized internal leasing costs	100,000		0	0	'
Amortization of deferred lease costs	34,000,000		29,800,000	30,000,000	'
Amortization of lease incentive	3,500,000		2,500,000	3,700,000	'
Amortization of debt discount (premium)	0		0	1,400,000	'
Shares-in-trust, shares authorized	150,000,000		150,000,000	'	'
Preferred stock, shares authorized	100,000,000		100,000,000	'	'
Common stock, shares authorized	750,000,000		750,000,000	'	'
Common stock, par value	$0.01		$0.01	'	'
Stock repurchase program, authorized amount	150,000,000		'	'	'
Stock repurchase program, remaining authorized repurchase amount	89,800,000		'	'	'
Dividend reinvestment plan, shareholders discount	2.00%		'	'	'
Number of lawsuits as defendant	2		'	'	'
Litigation settlement charge	-1,250,000		7,500,000	0	'
Insurance recoveries	1,300,000		'	'	'
Business interruption insurance recoveries	1,500,000		0	0	'
Provision for income taxes	0		9,000	5,000	'
Minimum [Member]	'		'	'	'
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'	'	'
Real estate investment trust status required taxable income distribution rate	90.00%		'	'	'
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		'	'	'
Consolidated Joint Venture [Member]	'		'	'	'
Significant Accounting Policies [Line Items]	'		'	'	'
Number of real estate properties	3		'	'	'
Above-Market In-Place Lease Assets [Member]	'		'	'	'
Significant Accounting Policies [Line Items]	'		'	'	'
Intangible Lease Assets:	21,137,000		'	21,468,000	'
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'	'	'
2014	2,050,000		'	'	'
2015	1,891,000		'	'	'
2016	1,662,000		'	'	'
2017	886,000		'	'	'
2018	309,000		'	'	'
Thereafter	131,000		'	'	'
Total	6,929,000		'	'	'
Weighted-Average Amortization Period (in years)	'4 years		'	'	'
Absorption Period Costs [Member]	'		'	'	'
Significant Accounting Policies [Line Items]	'		'	'	'
Intangible Lease Assets:	125,060,000		'	101,217,000	'
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'	'	'
2014	15,046,000		'	'	'
2015	13,789,000		'	'	'
2016	10,996,000		'	'	'
2017	8,241,000		'	'	'
2018	5,687,000		'	'	'
Thereafter	13,689,000		'	'	'
Total	67,448,000		'	'	'
Weighted-Average Amortization Period (in years)	'6 years		'	'	'
Lease Origination Costs [Member]	'		'	'	'
Significant Accounting Policies [Line Items]	'		'	'	'
Intangible Lease Assets:	158,427,000		'	116,995,000	'
Finite-Lived Intangible Assets, Future Amortization Expense [Abstract]	'		'	'	'
2014	18,882,000	[1]	'	'	'
2015	17,490,000	[1]	'	'	'
2016	14,652,000	[1]	'	'	'
2017	11,671,000	[1]	'	'	'
2018	8,726,000	[1]	'	'	'
Thereafter	21,449,000	[1]	'	'	'
Total	$92,870,000	[1]	'	'	'
Weighted-Average Amortization Period (in years)	'6 years	[1]	'	'	'
[1]	Included as a component of Deferred Lease Costs in the accompanying consolidated balance sheets.

Acquisitions_Details

Acquisitions (Details) (USD $)

0 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Aug. 12, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

property

Arlington Gateway [Member]

5 & 15 Wayside Road [Member]

2020 W. 89th Street [Member]

5301 Maryland Way [Member]

4685 Investment Drive [Member]

6565 MacArthur Blvd [Member]

One Lincoln Park [Member]

161 Corporate Center [Member]

Royal Lane [Member]

Joint_Venture

sqft

sqft

sqft

sqft

sqft

sqft

sqft

sqft

acre

Business Acquisition [Line Items]

'

'

'

'

'

'

'

'

'

'

Rentable Square Feet (Unaudited)

'

333,948

271,434

68,376

[1]

201,237

[1]

77,045

[1]

259,819

261,826

104,895

'

Percentage Leased as of Acquisition (Unaudited)

'

99.00%

95.00%

85.00%

[1]

100.00%

[1]

100.00%

[1]

93.00%

79.00%

91.00%

'

Contractual Purchase Price (in millions)

'

$175.60

$69.30

$4.30

[1]

$18.50

[1]

$10

[1]

$46.60

$56.70

$16

$2.60

Acreage

'

'

'

'

'

'

'

'

'

10.59

Number of real estate properties

3

'

'

'

'

'

'

'

'

'

Number of unconsolidated joint ventures

2

'

'

'

'

'

'

'

'

'

Amount purchased of remaining minority interest

$14.70

'

'

'

'

'

'

'

'

'

[1]

On August 12, 2013, Piedmont purchased all of the remaining interests in three office properties previously held through two unconsolidated joint ventures for approximately $14.7 million in cash.

Unconsolidated_Joint_Ventures_1

Unconsolidated Joint Ventures (Details) (USD $)	0 Months Ended	12 Months Ended
	Aug. 12, 2013	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
	property
	Joint_Venture
Investment [Line Items]	'	'		'		'
Net Book Value	'	$14,122,000		$37,226,000		'
Number of real estate properties	3	'		'		'
Number of unconsolidated joint ventures	2	'		'		'
Amount purchased of remaining minority interest	14,700,000	'		'		'
Loss on consolidation	'	-898,000		0		1,532,000
Fund XIII And REIT Joint Venture [Member]	'	'		'		'
Investment [Line Items]	'	'		'		'
Piedmont’s Approximate Ownership Percentage	'	72.00%		'		'
Net Book Value	'	14,122,000		18,814,000		'
Fund XII REIT and Joint Venture [Member]	'	'		'		'
Investment [Line Items]	'	'		'		'
Piedmont’s Approximate Ownership Percentage	'	55.00%	[1]	'		'
Net Book Value	'	0	[1]	15,813,000	[1]	'
Fund Xl Xll and REIT Joint Venture [Member]	'	'		'		'
Investment [Line Items]	'	'		'		'
Piedmont’s Approximate Ownership Percentage	'	57.00%	[1]	'		'
Net Book Value	'	$0	[1]	$2,599,000	[1]	'
[1]	On August 12, 2013, Piedmont purchased all of the remaining interests in three office properties previously held through these two unconsolidated joint ventures for approximately $14.7 million in cash, representing the estimated fair value of the respective property, less Piedmont's existing investment in the respective unconsolidated joint ventures. Such estimated fair value was derived by reference to a credible, unrelated third-party offer and verified using discounted cash flow analysis. Under the terms of the respective joint venture agreements, Piedmont exercised its dissenter's right to buy out each of its co-venturers' interests based upon the terms of the third-party offer. The $0.9 million difference between the fair value of the properties acquired and the sum of Piedmont's previously recorded book value in investment in unconsolidated joint ventures plus cash consideration paid for the interests was recorded as a loss on consolidation in Piedmont's consolidated statement of operations for the year ended December 31, 2013.

Debt_Details

Debt (Details) (USD $)

12 Months Ended

0 Months Ended

0 Months Ended

12 Months Ended

0 Months Ended

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

9-May-13

Dec. 31, 2013

Dec. 31, 2012

Dec. 18, 2013

Dec. 31, 2013

Dec. 31, 2012

Jan. 31, 2014

Jan. 31, 2014

Dec. 31, 2013

Dec. 18, 2013

Dec. 18, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

period

Interest Rate Swap [Member]

Secured Debt [Member]

Secured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

$350 Million Senior Notes [Member]

$350 Million Senior Notes [Member]

$350 Million Senior Notes [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Aon Center Chicago Mortgage Note [Member]

$500 Million Unsecured Line of Credit [Member]

$500 Million Unsecured Line of Credit [Member]

$200.0 Million Mortgage Note [Member]

$200.0 Million Mortgage Note [Member]

$200.0 Million Mortgage Note [Member]

$25.0 Million Mortgage Note [Member]

$25.0 Million Mortgage Note [Member]

$25.0 Million Mortgage Note [Member]

$350.0 Million Secured Pooled Facility [Member]

$350.0 Million Secured Pooled Facility [Member]

$105.0 Million Fixed-Rate Loan [Member]

$105.0 Million Fixed-Rate Loan [Member]

$125.0 Million Fixed-Rate Loan [Member]

$125.0 Million Fixed-Rate Loan [Member]

$42.5 Million Fixed-Rate Loan [Member]

$42.5 Million Fixed-Rate Loan [Member]

$140 Million WDC Mortgage Notes [Member]

$140 Million WDC Mortgage Notes [Member]

$300 Million 2011 Unsecured Term Loan Maturing 2016 [Member]

$300 Million 2011 Unsecured Term Loan Maturing 2016 [Member]

$300 Million 2011 Unsecured Term Loan Maturing 2016 [Member]

$300 Million 2011 Unsecured Term Loan Maturing 2016 [Member]

Debt_Facility

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Secured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Secured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Subsequent Event [Member]

Interest Rate Swap [Member]

LIBOR [Member]

Minimum [Member]

Maximum [Member]

Subsequent Event [Member]

Subsequent Event [Member]

property

property

agreement

Interest Rate Swap [Member]

LIBOR [Member]

agreement

Subsequent Event [Member]

Debt Instrument [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of new debt facilities entered during the period

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt instrument, face amount

'

'

'

'

'

'

'

'

$350,000,000

$350,000,000

'

$300,000,000

$300,000,000

'

'

'

'

'

'

'

$500,000,000

'

$200,000,000

'

$200,000,000

$25,000,000

'

$25,000,000

$350,000,000

'

$105,000,000

'

$125,000,000

'

$42,525,000

'

$140,000,000

'

$300,000,000

'

'

'

Rate

'

'

'

'

'

'

'

'

'

3.40%

[1],[2]

'

'

'

'

'

'

'

'

'

'

1.35%

[1],[3]

'

4.87%

[1]

'

'

5.70%

[1]

'

'

4.84%

[1],[4]

'

5.29%

[1]

'

5.50%

[1],[5]

'

5.70%

[1]

'

5.76%

[1]

'

'

'

'

'

Amount of repayments of debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

225,000,000

75,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of principal amount redeemed

'

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maturity period

'

'

'

'

'

'

'

'

'

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Spread on variable rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.20%

[1],[6]

0.00%

1.95%

'

1.18%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1.45%

[1],[7]

Stated interest rate spread

'

'

'

'

'

'

'

'

'

'

'

'

1.20%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unencumbered interest coverage ratio

'

'

'

'

'

'

'

'

'

'

'

1.75

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unencumbered leverage ratio

'

'

'

'

'

'

'

'

'

'

'

1.6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fixed charge coverage ratio

'

'

'

'

'

'

'

'

'

'

'

1.5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Leverage ratio

'

'

'

'

'

'

'

'

'

'

'

0.6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Secured debt ratio

'

'

'

'

'

'

'

'

'

'

'

0.4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net borrowings

237,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount of indebtedness outstanding

2,002,205,000

[8]

1,416,525,000

[8]

'

'

987,525,000

[8]

987,525,000

[8]

1,014,680,000

[8]

429,000,000

[8]

'

348,680,000

0

'

0

0

'

'

'

'

'

'

366,000,000

[9]

129,000,000

[9]

200,000,000

[10]

200,000,000

'

25,000,000

[10]

25,000,000

'

350,000,000

[4]

350,000,000

[4]

105,000,000

105,000,000

125,000,000

[5]

125,000,000

[5]

42,525,000

42,525,000

140,000,000

140,000,000

300,000,000

300,000,000

'

'

Weighted average interest rate

3.80%

[1],[8]

4.30%

[1],[3]

'

'

5.17%

[1],[8]

'

2.46%

[1],[8]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of properties In collateralized pool

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9

'

'

'

4

'

'

'

'

'

'

'

'

'

Effective rate

'

'

'

'

'

'

'

'

'

3.45%

'

'

'

'

'

2.79%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.69%

'

LIBOR interest rate in effect

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.17%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Additional extension period

'1 year

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of extension periods

2

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Extension period

'6 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of interest rate swap agreements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

Notional Amount

530,000,000

'

'

580,000,000

'

'

'

'

'

'

'

'

'

'

'

200,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

'

'

'

Interest payments on debt facilities

$69,800,000

$62,600,000

$66,700,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

All of Piedmont’s outstanding debt as of December 31, 2013 and 2012 is interest-only debt.

[2]

The $350 Million Senior Notes have a fixed coupon rate of 3.40%, however, as a result of the issuance of the notes at a discount, Piedmont recognizes an effective interest rate on this debt issuance of 3.45%.

[3]

Piedmont may select from multiple interest rate options with each draw, including the prime rate and various length LIBOR locks. All LIBOR selections are subject to an additional spread (1.175% as of December 31, 2013) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of December 31, 2013 consists of LIBOR draws at an average rate of 0.17% (subject to the additional spread mentioned above). Further, for the year ended December 31, 2013, Piedmont incurred net borrowings of approximately $237.0 million on its outstanding line of credit.

[4]

Nine property collateralized pool includes:1200 Crown Colony Drive in Quincy, Massachusetts, Braker Pointe III in Austin, Texas, 2 Gatehall Drive in Parsippany, New Jersey, the One and Two Independence Square buildings in Washington, DC, 2120 West End Avenue in Nashville, Tennessee, 400 Bridgewater Crossing in Bridgewater, New Jersey, 200 Bridgewater Crossing in Bridgewater, New Jersey, and Fairway Center II in Brea, California.

[5]

Four property collateralized pool includes 1430 Enclave Parkway in Houston, Texas, Windy Point I and II in Schaumburg, Illinois, and 1055 East Colorado Boulevard in Pasadena, California.

[6]

On January 30, 2014, Piedmont drew the full commitment of the $300 Million Unsecured 2013 Term Loan. Additionally, Piedmont entered into four interest rate swap agreements with a total notional value of $200 million to effectively fix the interest rate for this portion of the debt at 2.79%.

[7]

The $300 Million Unsecured 2011 Term Loan has a stated variable rate; however, Piedmont entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, the rate on this facility to 2.69% through maturity.

[8]

Weighted average is based on the net book value of outstanding debt and interest rates in the table (or as footnoted) as of December 31, 2013.

[9]

Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of August 21, 2017) provided Piedmont is not then in default and upon payment of extension fees.

[10]

On January 31, 2014, Piedmont used the proceeds of the $300 Million Unsecured 2013 Term Loan mentioned above to fully repay the $200 Million Mortgage Note and the $25 Million Mortgage Note

Debt_Maturities_of_Longterm_De

Debt (Maturities of Long-term Debt) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Debt Disclosure [Abstract]	'
2014	$575,000
2015	105,000
2016	833,525	[1]
2017	140,000
2018	0
Thereafter	350,000
Total	$2,003,525
[1]	Includes the balance outstanding as of December 31, 2013 of the $500 Million Unsecured 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 August 21, 2017) provided Piedmont is not then in default and upon payment of extension fees.

Variable_Interest_Entities_Det

Variable Interest Entities (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Eye Street 1201 NW Associates LLC [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Piedmont’s % Ownership of Entity	49.50%	'
Net Carrying Amount	($5.30)	($5.70)
Percent of cash flow entitled to entity	100.00%	'
Eye Street 1225 NW Associates LLC [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Piedmont’s % Ownership of Entity	49.50%	'
Net Carrying Amount	-0.9	-0.1
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	228.3	194
Suwanee Gateway One LLC [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Piedmont’s % Ownership of Entity	100.00%	'
Net Carrying Amount	7.4	7.6
Medici Atlanta LLC [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Piedmont’s % Ownership of Entity	100.00%	'
Net Carrying Amount	14.4	13.7
400 TownPark, LLC [Member]	'	'
Variable Interest Entity [Line Items]	'	'
Piedmont’s % Ownership of Entity	100.00%	'
Net Carrying Amount	$22.30	$23.50

Derivative_Instruments_Details

Derivative Instruments (Details) (USD $)

12 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

9-May-13

Dec. 31, 2013

Dec. 18, 2013

Jan. 31, 2014

Jan. 31, 2014

agreement

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Interest Rate Contract [Member]

Interest Rate Swap [Member]

Interest Rate Swap 1 [Member]

Interest Rate Swap 2 [Member]

Interest Rate Swap 3 [Member]

Interest Rate Swap 4 [Member]

Forward Starting Interest Rate Swap 3 [Member]

Forward Starting Interest Rate Swap 4 [Member]

Forward Starting Interest Rate Swap 5 [Member]

Forward Starting Interest Rate Swap 6 [Member]

Credit Risk Contract [Member]

Debt [Member]

Senior Notes [Member]

Senior Notes [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Unsecured Debt [Member]

Interest Expense [Member]

Interest Expense [Member]

Interest Expense [Member]

$350 Million Senior Notes [Member]

$350 Million Senior Notes [Member]

$300 Million 2011 Unsecured Term Loan Maturing 2016 [Member]

$350 Million Senior Notes [Member]

$350 Million Senior Notes [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

Unsecured 300 million 2013 Term Loan Maturing 2019 [Member]

agreement

Forward Starting Interest Rate Swap [Member]

agreement

Subsequent Event [Member]

Interest Rate Swap [Member]

agreement

Subsequent Event [Member]

Derivative [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of interest rate swap agreements

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

4

'

Total notional amount of forward starting interest rate agreements

$530,000,000

'

'

'

'

'

$580,000,000

$125,000,000

$75,000,000

$50,000,000

$50,000,000

$70,000,000

$70,000,000

$70,000,000

$70,000,000

'

'

'

$250,000,000

$300,000,000

'

'

'

'

'

$200,000,000

Debt instrument, face amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

300,000,000

350,000,000

350,000,000

300,000,000

300,000,000

'

'

Number of forward starting interest rate swap agreements

6

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of forward starting swap agreements settled during the period

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

'

'

'

'

Gain on settlement of forward starting swap agreements

-672,000

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

700,000

'

'

'

'

'

'

'

'

Term of notes

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 years

'

'

'

'

'

'

'

'

Hedged amount for potential issuance of long term debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

280,000,000

'

'

'

'

'

'

'

'

'

Derivative, term of contract

'123 months

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest Rate Cash Flow Hedge Derivative at Fair Value, Net [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate swaps

24,176,000

1,075,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate swaps

-4,526,000

-8,235,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net derivative asset/(liability)

19,650,000

-7,160,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount of loss/(gain) recognized in OCI on derivatives

'

'

'

-24,312,000

7,656,000

3,064,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount of previously recorded loss reclassified from accumulated OCI into interest expense

'

'

'

-3,126,000

-3,033,000

-1,218,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount that will be reclassified from accumulated other comprehensive income over the next twelve months

-7,300,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Assets needed for immediate settlement, aggregate fair value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$4,700,000

'

'

'

'

'

'

'

'

'

'

Fair_Value_Measurements_Detail

Fair Value Measurements (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Interest rate swap asset	$24,176		$1,075
Interest rate swap liability	4,526		8,235
Carrying (Reported) Amount, Fair Value Disclosure [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Cash and cash equivalents	6,973	[1]	12,957	[1]
Tenant receivables, net	31,145	[1]	25,038	[1]
Restricted cash and escrows	394	[1]	334	[1]
Accounts payable and accrued expenses	16,680	[1]	23,113	[1]
Debt	2,002,205		1,416,525
Estimate of Fair Value, Fair Value Disclosure [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Cash and cash equivalents	'		12,957	[1]
Tenant receivables, net	'		25,038	[1]
Restricted cash and escrows	'		334	[1]
Accounts payable and accrued expenses	'		23,113	[1]
Debt	'		1,470,002
Interest Rate Swap [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Interest rate swap asset	24,176		1,075
Interest rate swap liability	4,526		8,235
Interest Rate Swap [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Interest rate swap asset	'		1,075
Interest rate swap liability	'		8,235
Fair Value, Inputs, Level 1 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Cash and cash equivalents	6,973	[1]	'
Tenant receivables, net	31,145	[1]	'
Restricted cash and escrows	394	[1]	'
Accounts payable and accrued expenses	16,680	[1]	'
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Debt	2,004,870		'
Fair Value, Inputs, Level 2 [Member] | Interest Rate Swap [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]	'		'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'		'
Interest rate swap asset	24,176		'
Interest rate swap liability	$4,526		'
[1]	For the periods presented, the carrying value approximates estimated fair value due to its short-term maturity.

Impairment_of_Certain_Real_Est2

Impairment of Certain Real Estate Assets (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Aug. 12, 2013
				property
Impaired Long-Lived Assets Held and Used [Line Items]	'	'	'	'
Impairment losses included in continuing operations:	$1,242	$0	$0	'
Number of real estate properties	'	'	'	3
1111 Durham Avenue [Member]	'	'	'	'
Impaired Long-Lived Assets Held and Used [Line Items]	'	'	'	'
Impairment losses recorded in discontinued operations:	6,402	0	0	'
11107 and 11109 Sunset Hills Road [Member]	'	'	'	'
Impaired Long-Lived Assets Held and Used [Line Items]	'	'	'	'
Impairment losses included in continuing operations:	1,242	0	0	'
Piedmont's Investment in Fund 13 and REIT JV (at Piedmont's approximate 72% ownership) [Member]	'	'	'	'
Impaired Long-Lived Assets Held and Used [Line Items]	'	'	'	'
Impairment losses recorded in equity in loss of unconsolidated joint ventures:	$4,402	$0	$0	'
Piedmont’s Approximate Ownership Percentage	72.00%	'	'	'
Number of real estate properties	2	'	'	'

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Loss Contingencies [Line Items]	'		'	'
Letter of credit renewal period	'1 year		'	'
Property subject to or available for operating lease, number of units	2		'	'
Operating Leases, Future Minimum Payments Due [Abstract]	'		'	'
2014	$451,000		'	'
2015	451,000		'	'
2016	451,000		'	'
2017	451,000		'	'
2018	451,000		'	'
Thereafter	41,071,000		'	'
Total	43,326,000		'	'
Land [Member]	'		'	'
Operating Leases, Future Minimum Payments Due [Abstract]	'		'	'
Ground rent expense	800,000		800,000	600,000
Building [Member]	'		'	'
Operating Leases, Future Minimum Payments Due [Abstract]	'		'	'
Net book value of real estate assets subject to operating ground leases	21,900,000		31,800,000	'
Collectibility of Tenant Reimbursements [Member]	'		'	'
Loss Contingencies [Line Items]	'		'	'
Additional expense related to such tenant audits/disputes	1,200,000		200,000	700,000
Letter of Credit One, July 2013 [Member]	'		'	'
Loss Contingencies [Line Items]	'		'	'
Letters of credit outstanding, amount	1,805,480	[1]	'	'
Letter of Credit Two, July 2013 [Member]	'		'	'
Loss Contingencies [Line Items]	'		'	'
Letters of credit outstanding, amount	9,033,164	[1]	'	'
Letter of Credit Three, July 2013 [Member]	'		'	'
Loss Contingencies [Line Items]	'		'	'
Letters of credit outstanding, amount	382,556		'	'
Unsecured Debt [Member] | $500 Million Unsecured Line of Credit [Member]	'		'	'
Loss Contingencies [Line Items]	'		'	'
Debt instrument, face amount	500,000,000		'	'
NonIncremental Capital Expenditures [Member]	'		'	'
Loss Contingencies [Line Items]	'		'	'
Commitment to provide funding to tenants for capital improvements	85,100,000		'	'
Incremental Capital Expenditures [Member]	'		'	'
Loss Contingencies [Line Items]	'		'	'
Commitment to provide funding to tenants for capital improvements	$19,500,000		'	'
[1]	These letter of credit agreements were terminated in conjunction with repaying the notes payable secured by the Aon Center building in Chicago, Illinois on February 3, 2014.

Stock_Based_Compensation_Detai

Stock Based Compensation (Details) (USD $)

12 Months Ended

In Thousands, except Share data, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2013

Apr. 05, 2011

Dec. 31, 2013

Apr. 05, 2011

Dec. 31, 2013

Apr. 04, 2012

Dec. 31, 2013

Apr. 04, 2012

Dec. 31, 2013

Apr. 02, 2013

Dec. 31, 2013

Apr. 02, 2013

Stock Awards [Member]

Stock Awards [Member]

Stock Awards [Member]

Stock Awards, Granted April 5, 2011 [Member]

Stock Awards, Granted April 5, 2011 [Member]

Stock Awards 2, Granted April 5, 2011 [Member]

Stock Awards 2, Granted April 5, 2011 [Member]

Stock Awards 1, Granted April 4 2012 [Member]

Stock Awards 1, Granted April 4 2012 [Member]

Stock Awards 2, Granted April 4 2012 [Member]

Stock Awards 2, Granted April 4 2012 [Member]

Stock Awards, Granted April 2, 2013 [Member]

Stock Awards, Granted April 2, 2013 [Member]

Stock Awards 2, Granted April 2, 2013 [Member]

Stock Awards 2, Granted April 2, 2013 [Member]

Rollforward of deferred stock award activity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested Deferred Stock Awards as of December 31, 2012

318,893

'

'

36,835

'

0

[1]

'

110,184

'

0

[1]

'

118,120

'

0

[1]

'

Deferred Stock Awards Granted During Fiscal Year 2013

161,257

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Stock Awards Vested During Fiscal Year 2013

-209,284

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Stock Awards Forfeited During Fiscal Year 2013

-5,727

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested Deferred Stock Awards as of December 31, 2013

265,139

318,893

'

36,835

'

0

[1]

'

110,184

'

0

[1]

'

118,120

'

0

[1]

'

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

$18.41

'

'

'

$19.40

'

$18.27

'

$17.53

'

$17.42

'

$19.47

'

$18.91

Deferred Stock Awards Granted During Fiscal Year 2013, Weighted-Average Grant Date Fair

$19.47

$17.53

$19.03

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Stock Awards Vested During Fiscal Year 2013, Weighted-Average Grant Date Fair Value

$18.91

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Deferred Stock Awards Forfeited During Fiscal Year 2013, Weighted Average Grant Date Fair Value

$18.62

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value at end of year

$18.65

$18.41

'

'

$19.40

'

$18.27

'

$17.53

'

$17.42

'

$19.47

'

$18.91

Total Grant Date Fair Value of Shares Vested During the Year

$3,957

$5,331

$5,405

'

'

'

'

'

'

'

'

'

'

'

'

Share-based Liabilities Paid

$103

[2]

$798

[2]

$851

[2]

'

'

'

'

'

'

'

'

'

'

'

'

Net Shares Granted

'

'

'

'

116,116

[3]

'

0

[3]

'

190,134

[3]

'

0

[3]

'

146,679

[3]

'

0

[3]

Grant Date Fair Value

$18.65

$18.41

'

'

$19.40

'

$18.27

'

$17.53

'

$17.42

'

$19.47

'

$18.91

Unvested Shares (in shares)

265,139

318,893

'

36,835

'

0

[1]

'

110,184

'

0

[1]

'

118,120

'

0

[1]

'

Of the shares granted, % vested

'

'

'

25.00%

'

'

'

25.00%

'

'

'

25.00%

'

'

'

Of the shares granted, % expected to vest within one year

'

'

'

25.00%

'

'

'

25.00%

'

'

'

25.00%

'

'

'

Of the shares granted, % expected to vest in two years

'

'

'

25.00%

'

'

'

25.00%

'

'

'

25.00%

'

'

'

Of the shares granted, % expected to vest in three years

'

'

'

25.00%

'

'

'

25.00%

'

'

'

25.00%

'

'

'

[1]

Estimated based on Piedmont's cumulative total stockholder return ("TSR") for the respective performance period through December 31, 2013. As of December 31, 2013, Piedmont's TSR for each of these respective plans was below threshold. Such estimates are subject to change in future periods based on both Piedmont's and its peers' stock performance and dividends paid.

[2]

Amounts reflect the issuance of performance share awards during the period.

[3]

Amounts reflect the total grant to employees, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through December 31, 2013.

Stock_Based_Compensation_Narra

Stock Based Compensation (Narrative) (Details) (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Compensation expense and directors' fees related to stock awards	$3.10	$3.90	$6.50
Compensation expense, non-vested awards	2	2.5	5.3
Shares were issued to employees, directors and officers	150,852	'	'
Nonvested awards, total compensation cost not yet recognized	$1.90	'	'
Nonvested awards, total compensation cost not yet recognized, period for recognition	'1 year	'	'
Stock Awards [Member]	'	'	'
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]	'	'	'
Award vesting period	'3 years	'	'
Period of predetermined peer group's total stockholder return	'3 years	'	'

Earnings_Per_Share_Details

Earnings Per Share (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]	'	'	'
Weighted-average common shares – basic (in shares)	165,012,713	170,312,328	172,764,838
Plus incremental weighted-average shares resulting from the assumed conversion of time-vested restricted stock awards (in shares)	124,769	128,895	216,109
Weighted-average common shares – diluted (in shares)	165,137,482	170,441,223	172,980,947

Operating_Leases_Details

Operating Leases (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]	'
Percentage of annualized lease revenue	90.00%
Operating Leases, Future Minimum Payments Receivable [Abstract]	'
2014	386,504
2015	394,329
2016	372,684
2017	352,014
2018	321,294
Thereafter	1,446,082
Total	3,272,907
Customer Concentration Risk [Member] | Federal Governmental Agencies [Member]	'
Revenues from External Customers and Long-Lived Assets [Line Items]	'
Concentration risk, percentage	10.00%

Discontinued_Operations_Detail

Discontinued Operations (Details) (USD $)

3 Months Ended

12 Months Ended

0 Months Ended

In Thousands, unless otherwise specified

Dec. 31, 2013

Sep. 30, 2013

Jun. 30, 2013

Mar. 31, 2013

Dec. 31, 2012

Sep. 30, 2012

Jun. 30, 2012

Mar. 31, 2012

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Jul. 02, 2011

Aug. 31, 2011

Dec. 15, 2011

Mar. 19, 2012

31-May-12

Sep. 21, 2012

Mar. 28, 2013

1-May-13

Nov. 01, 2013

Dec. 30, 2013

Eastpointe Corporate Center [Member]

Corporate Court 5000 [Member]

W Wacker Building 35 [Member]

Portland Portfolio [Member]

26200 Enterprise Way [Member]

Hidden Lake Circle Buildings [Member]

1111 Durham Avenue [Member]

Enclave 1200 Parkway [Member]

350 Spectrum Loop [Member]

8700 South Price Road [Member]

property

acre

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

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gain on sale of real estate assets

'

'

'

'

'

'

'

'

$31,292

$27,577

$122,657

$12,152

$14,367

$96,138

[1]

$17,823

[2]

$10,013

($259)

($9)

$16,246

$7,959

$7,096

Net Sales Proceeds

'

'

'

'

'

'

'

'

95,671

93,839

291,785

31,704

36,100

223,981

[1]

43,832

[2]

24,412

25,595

3,752

45,552

29,676

16,691

Percent of ownership interest In real estate property disposal

'

'

'

'

'

'

'

'

'

'

'

'

'

96.50%

'

'

'

'

'

'

'

Number of real estate properties sold

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4

'

'

'

'

'

'

Acreage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

18.19

'

'

'

'

'

'

Revenues:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Rental income

'

'

'

'

'

'

'

'

4,678

13,215

45,306

'

'

'

'

'

'

'

'

'

'

Tenant reimbursements

'

'

'

'

'

'

'

'

757

1,528

20,632

'

'

'

'

'

'

'

'

'

'

Revenue

'

'

'

'

'

'

'

'

5,435

14,743

65,938

'

'

'

'

'

'

'

'

'

'

Expenses:

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Property operating costs

'

'

'

'

'

'

'

'

1,900

5,216

26,243

'

'

'

'

'

'

'

'

'

'

Depreciation

'

'

'

'

'

'

'

'

1,004

3,291

9,044

'

'

'

'

'

'

'

'

'

'

Amortization

'

'

'

'

'

'

'

'

209

690

5,995

'

'

'

'

'

'

'

'

'

'

General and administrative

'

'

'

'

'

'

'

'

2

45

-168

'

'

'

'

'

'

'

'

'

'

Expenses

'

'

'

'

'

'

'

'

3,115

9,242

41,114

'

'

'

'

'

'

'

'

'

'

Other income (expense):

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest expense

'

'

'

'

'

'

'

'

0

0

-5,931

'

'

'

'

'

'

'

'

'

'

Interest income and other income/(expense)

'

'

'

'

'

'

'

'

26

0

-91

'

'

'

'

'

'

'

'

'

'

Net casualty recoveries

'

'

'

'

'

'

'

'

17

0

0

'

'

'

'

'

'

'

'

'

'

Net loss attributable to noncontrolling interest

'

'

'

'

'

'

'

'

0

0

-453

'

'

'

'

'

'

'

'

'

'

Other income (expense)

'

'

'

'

'

'

'

'

43

0

-6,475

'

'

'

'

'

'

'

'

'

'

Operating income, excluding impairment loss and gain on sale of real estate assets

'

'

'

'

'

'

'

'

2,363

5,501

18,349

'

'

'

'

'

'

'

'

'

'

Impairment loss

'

'

'

'

'

'

'

'

-6,402

0

0

'

'

'

'

'

'

'

'

'

'

Income from discontinued operations

$15,468

$412

$17,083

($5,710)

$1,809

$612

$11,133

$19,524

$27,253

$33,078

$141,006

'

'

'

'

'

'

'

'

'

'

[1]

Piedmont sold its approximate 96.5% ownership in the property. Transaction data above is presented at Piedmont's ownership percentage.

[2]

The Portland Portfolio consisted of four office properties known as the Deschutes building, the Rhein building, the Rogue building, and the Willamette building, as well as 18.19 acres of adjoining, undeveloped land.

Supplemental_Disclosures_of_No2

Supplemental Disclosures of Noncash Activities (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Supplemental Cash Flow Elements [Abstract]	'	'	'
Accrued capital expenditures and deferred lease costs	$12,460	$12,598	$8,218
Change in accrued offering costs related to issuance of common stock	0	-567	227
Net assets assumed upon consolidation of variable interest entity, net of notes receivable previously recorded	0	0	188,283
Liabilities assumed upon consolidation of variable interest entity	0	0	191,814
Change in accrued share repurchases as part of an announced plan	$1,718	$287	$0

Income_Taxes_Details

Income Taxes (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Net income attributable to Piedmont	$29,623,000	$19,096,000	$35,358,000	$14,651,000	$14,438,000	$10,830,000	$30,708,000	$37,228,000	$98,728,000	$93,204,000	$225,041,000
Depreciation and amortization expense for financial reporting purposes in excess of amounts for income tax purposes	'	'	'	'	'	'	'	'	42,374,000	35,125,000	47,346,000
Rental income accrued for income tax purposes less than amounts for financial reporting purposes	'	'	'	'	'	'	'	'	-25,964,000	-10,422,000	-9,380,000
Net amortization of above/below-market lease intangibles for financial reporting purposes in excess of amounts for income tax purposes	'	'	'	'	'	'	'	'	-4,701,000	-5,324,000	-6,605,000
Gain on disposal of property for financial reporting purposes in excess of amounts for income tax purposes	'	'	'	'	'	'	'	'	-35,153,000	-7,967,000	-66,410,000
Taxable income of Piedmont Washington Properties, Inc., in excess of amount for financial reporting purposes	'	'	'	'	'	'	'	'	0	2,662,000	4,515,000
Other expenses for financial reporting purposes in excess of amounts for income tax purposes	'	'	'	'	'	'	'	'	9,045,000	14,361,000	-2,072,000
Income tax basis net income, prior to dividends paid deduction	'	'	'	'	'	'	'	'	84,329,000	121,639,000	192,435,000
Ordinary income	'	'	'	'	'	'	'	'	64.00%	73.00%	61.00%
Return of capital	'	'	'	'	'	'	'	'	36.00%	11.00%	12.00%
Capital gains	'	'	'	'	'	'	'	'	0.00%	16.00%	27.00%
Common Stock Dividends, Percent	'	'	'	'	'	'	'	'	100.00%	100.00%	100.00%
Tax basis of total assets	4,500,000,000	'	'	'	4,100,000,000	'	'	'	4,500,000,000	4,100,000,000	'
Accrued interest and penalties related to uncertain tax positions	$6,700,000	'	'	'	$6,700,000	'	'	'	$6,700,000	$6,700,000	'

Quarterly_Results_unaudited_De

Quarterly Results (unaudited) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Quarterly Financial Information Disclosure [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Revenues	$142,868	$144,631	$133,713	$133,293	$132,379	$132,149	$130,556	$129,960	$554,505	$525,044	$525,108
Real estate operating income	33,981	35,563	32,863	37,781	33,846	33,263	34,991	33,978	140,188	136,078	142,811
Income from continuing operations	14,158	18,688	18,279	20,365	12,633	10,222	19,579	17,707	71,490	60,141	84,050
Income/(loss) from discontinued operations	15,468	412	17,083	-5,710	1,809	612	11,133	19,524	27,253	33,078	141,006
Net income attributable to Piedmont	$29,623	$19,096	$35,358	$14,651	$14,438	$10,830	$30,708	$37,228	$98,728	$93,204	$225,041
Basic and diluted earnings per share	$0.18	$0.12	$0.21	$0.09	$0.09	$0.06	$0.18	$0.22	$0.60	$0.55	$1.30
Dividends per share	$0.20	$0.20	$0.20	$0.20	$0.20	$0.20	$0.20	$0.20	$0.80	$0.80	$1.26

Guarantor_and_NonGuarantor_Fin

Guarantor and Non-Guarantor Financial Information- Condensed Consolidated Balance Sheets (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Assets:	'		'		'	'
Land	$688,761		$629,536		'	'
Buildings and improvements, less accumulated depreciation	3,164,575		2,908,078		'	'
Intangible lease assets, less accumulated amortization	74,377		54,745		'	'
Construction in progress	24,270		20,373		'	'
Total real estate assets	3,951,983		3,612,732		'	'
Investments in and amounts due from unconsolidated joint ventures	14,388		37,689		'	'
Cash and cash equivalents	6,973		12,957		139,690	56,718
Tenant and straight-line receivables, net	170,551		147,337		'	'
Advances to affiliates	0		0		'	'
Investment in subsidiary	0		0		'	'
Notes receivable	0		0		'	'
Prepaid expenses, restricted cash, escrows, and other assets	25,165		21,617		'	'
Goodwill	180,097		180,097		'	'
Interest rate swaps	24,176		1,075		'	'
Deferred financing costs, net	8,759		6,454		'	'
Deferred lease costs, net	283,996		234,917		'	'
Total assets	4,666,088		4,254,875		'	'
Liabilities:	'		'		'	'
Debt	2,002,205	[1]	1,416,525	[1]	'	'
Accounts payable, accrued expenses, and accrued capital expenditures	128,818		127,263		'	'
Advances from affiliates	0		0		'	'
Deferred income	22,267		21,552		'	'
Intangible lease liabilities, net	47,113		40,805		'	'
Interest rate swaps	4,526		8,235		'	'
Total liabilities	2,204,929		1,614,380		'	'
Stockholders’ Equity:	'		'		'	'
Common stock	1,575		1,676		'	'
Additional paid-in capital	3,668,906		3,667,051		'	'
Cumulative distributions in excess of earnings	-1,231,209		-1,022,681		'	'
Other comprehensive income/(loss)	20,278		-7,160		'	'
Piedmont stockholders’ equity	2,459,550		2,638,886		'	'
Noncontrolling interest	1,609		1,609		'	'
Total stockholders’ equity	2,461,159		2,640,495		2,773,428	2,773,454
Total liabilities and stockholders’ equity	4,666,088		4,254,875		'	'
Issuer [Member]	'		'		'	'
Assets:	'		'		'	'
Land	88,054		93,967		'	'
Buildings and improvements, less accumulated depreciation	477,712		528,548		'	'
Intangible lease assets, less accumulated amortization	2,356		3,266		'	'
Construction in progress	4,627		1,056		'	'
Total real estate assets	572,749		626,837		'	'
Investments in and amounts due from unconsolidated joint ventures	14,388		37,689		'	'
Cash and cash equivalents	3,352		62,371		166,920	61,516
Tenant and straight-line receivables, net	36,142		34,288		'	'
Advances to affiliates	5,312,384		4,623,173		'	'
Investment in subsidiary	0		0		'	'
Notes receivable	160,000		160,000		'	'
Prepaid expenses, restricted cash, escrows, and other assets	5,319		5,149		'	'
Goodwill	180,097		180,097		'	'
Interest rate swaps	24,176		1,075		'	'
Deferred financing costs, net	7,764		4,292		'	'
Deferred lease costs, net	34,413		30,426		'	'
Total assets	6,350,784		5,765,397		'	'
Liabilities:	'		'		'	'
Debt	1,038,570		452,890		'	'
Accounts payable, accrued expenses, and accrued capital expenditures	13,824		20,443		'	'
Advances from affiliates	312,881		274,159		'	'
Deferred income	5,086		5,991		'	'
Intangible lease liabilities, net	0		24		'	'
Interest rate swaps	4,526		8,235		'	'
Total liabilities	1,374,887		761,742		'	'
Stockholders’ Equity:	'		'		'	'
Common stock	0		0		'	'
Additional paid-in capital	4,003,806		4,068,844		'	'
Cumulative distributions in excess of earnings	951,813		941,971		'	'
Other comprehensive income/(loss)	20,278		-7,160		'	'
Piedmont stockholders’ equity	4,975,897		5,003,655		'	'
Noncontrolling interest	0		0		'	'
Total stockholders’ equity	4,975,897		5,003,655		'	'
Total liabilities and stockholders’ equity	6,350,784		5,765,397		'	'
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		'	'
Total real estate assets	0		0		'	'
Investments in and amounts due from unconsolidated joint ventures	0		0		'	'
Cash and cash equivalents	150		239		139	896
Tenant and straight-line receivables, net	0		0		'	'
Advances to affiliates	1,288,547		1,300,158		'	'
Investment in subsidiary	4,003,806		4,068,844		'	'
Notes receivable	2,000		2,500		'	'
Prepaid expenses, restricted cash, escrows, and other assets	44		14		'	'
Goodwill	0		0		'	'
Interest rate swaps	0		0		'	'
Deferred financing costs, net	0		0		'	'
Deferred lease costs, net	0		0		'	'
Total assets	5,294,547		5,371,755		'	'
Liabilities:	'		'		'	'
Debt	0		0		'	'
Accounts payable, accrued expenses, and accrued capital expenditures	2,376		645		'	'
Advances from affiliates	4,863,672		4,636,936		'	'
Deferred income	0		0		'	'
Intangible lease liabilities, net	0		0		'	'
Interest rate swaps	0		0		'	'
Total liabilities	4,866,048		4,637,581		'	'
Stockholders’ Equity:	'		'		'	'
Common stock	1,575		1,676		'	'
Additional paid-in capital	3,668,906		3,667,051		'	'
Cumulative distributions in excess of earnings	-3,241,982		-2,934,553		'	'
Other comprehensive income/(loss)	0		0		'	'
Piedmont stockholders’ equity	428,499		734,174		'	'
Noncontrolling interest	0		0		'	'
Total stockholders’ equity	428,499		734,174		'	'
Total liabilities and stockholders’ equity	5,294,547		5,371,755		'	'
Non-Guarantor Subsidiaries [Member]	'		'		'	'
Assets:	'		'		'	'
Land	600,707		535,569		'	'
Buildings and improvements, less accumulated depreciation	2,687,163		2,379,530		'	'
Intangible lease assets, less accumulated amortization	72,021		51,479		'	'
Construction in progress	19,643		19,317		'	'
Total real estate assets	3,379,534		2,985,895		'	'
Investments in and amounts due from unconsolidated joint ventures	0		0		'	'
Cash and cash equivalents	3,471		-49,653		-27,369	-5,694
Tenant and straight-line receivables, net	134,409		113,049		'	'
Advances to affiliates	0		0		'	'
Investment in subsidiary	197		200		'	'
Notes receivable	23,890		23,890		'	'
Prepaid expenses, restricted cash, escrows, and other assets	20,779		17,402		'	'
Goodwill	0		0		'	'
Interest rate swaps	0		0		'	'
Deferred financing costs, net	995		2,162		'	'
Deferred lease costs, net	249,583		204,491		'	'
Total assets	3,812,858		3,297,436		'	'
Liabilities:	'		'		'	'
Debt	1,149,525		1,150,025		'	'
Accounts payable, accrued expenses, and accrued capital expenditures	113,595		107,123		'	'
Advances from affiliates	1,467,334		1,044,446		'	'
Deferred income	17,181		15,561		'	'
Intangible lease liabilities, net	47,113		40,781		'	'
Interest rate swaps	0		0		'	'
Total liabilities	2,794,748		2,357,936		'	'
Stockholders’ Equity:	'		'		'	'
Common stock	0		0		'	'
Additional paid-in capital	197		200		'	'
Cumulative distributions in excess of earnings	1,016,304		937,691		'	'
Other comprehensive income/(loss)	0		0		'	'
Piedmont stockholders’ equity	1,016,501		937,891		'	'
Noncontrolling interest	1,609		1,609		'	'
Total stockholders’ equity	1,018,110		939,500		'	'
Total liabilities and stockholders’ equity	3,812,858		3,297,436		'	'
Eliminations [Member]	'		'		'	'
Assets:	'		'		'	'
Land	0		0		'	'
Buildings and improvements, less accumulated depreciation	-300		0		'	'
Intangible lease assets, less accumulated amortization	0		0		'	'
Construction in progress	0		0		'	'
Total real estate assets	-300		0		'	'
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	-6,600,931		-5,923,331		'	'
Investment in subsidiary	-4,004,003		-4,069,044		'	'
Notes receivable	-185,890		-186,390		'	'
Prepaid expenses, restricted cash, escrows, and other assets	-977		-948		'	'
Goodwill	0		0		'	'
Interest rate swaps	0		0		'	'
Deferred financing costs, net	0		0		'	'
Deferred lease costs, net	0		0		'	'
Total assets	-10,792,101		-10,179,713		'	'
Liabilities:	'		'		'	'
Debt	-185,890		-186,390		'	'
Accounts payable, accrued expenses, and accrued capital expenditures	-977		-948		'	'
Advances from affiliates	-6,643,887		-5,955,541		'	'
Deferred income	0		0		'	'
Intangible lease liabilities, net	0		0		'	'
Interest rate swaps	0		0		'	'
Total liabilities	-6,830,754		-6,142,879		'	'
Stockholders’ Equity:	'		'		'	'
Common stock	0		0		'	'
Additional paid-in capital	-4,004,003		-4,069,044		'	'
Cumulative distributions in excess of earnings	42,656		32,210		'	'
Other comprehensive income/(loss)	0		0		'	'
Piedmont stockholders’ equity	-3,961,347		-4,036,834		'	'
Noncontrolling interest	0		0		'	'
Total stockholders’ equity	-3,961,347		-4,036,834		'	'
Total liabilities and stockholders’ equity	($10,792,101)		($10,179,713)		'	'
[1]	Weighted average is based on the net book value of outstanding debt and interest rates in the table (or as footnoted) as of December 31, 2013.

Guarantor_Financials_Guarantor

Guarantor Financials Guarantor and Non-Guarantor Financial Information - Condensed Consolidated Statements of Income (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:	'	'	'	'	'	'	'	'	'	'	'
Rental income	'	'	'	'	'	'	'	'	$447,687	$415,972	$409,711
Tenant reimbursements	'	'	'	'	'	'	'	'	104,567	106,754	113,813
Property management fee revenue	'	'	'	'	'	'	'	'	2,251	2,318	1,584
Total revenues	142,868	144,631	133,713	133,293	132,379	132,149	130,556	129,960	554,505	525,044	525,108
Expenses:	'	'	'	'	'	'	'	'	'	'	'
Property operating costs	'	'	'	'	'	'	'	'	222,979	208,280	202,531
Depreciation	'	'	'	'	'	'	'	'	122,562	110,359	100,686
Amortization	'	'	'	'	'	'	'	'	45,651	49,562	54,008
Impairment loss	'	'	'	'	'	'	'	'	1,242	0	0
General and administrative	'	'	'	'	'	'	'	'	21,883	20,765	25,072
Operating Expenses	'	'	'	'	'	'	'	'	414,317	388,966	382,297
Real estate operating income	33,981	35,563	32,863	37,781	33,846	33,263	34,991	33,978	140,188	136,078	142,811
Other income (expense):	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	-73,583	-65,023	-65,817
Interest income and other income/(expense)	'	'	'	'	'	'	'	'	-2,352	833	2,866
Litigation settlement recovery/(expense)	'	'	'	'	'	'	'	'	1,250	-7,500	0
Net casualty recoveries/(loss)	'	'	'	'	'	'	'	'	10,561	-5,170	0
Equity in income/(loss) of unconsolidated joint ventures	'	'	'	'	'	'	'	'	-3,676	923	1,619
Loss on consolidation	'	'	'	'	'	'	'	'	-898	0	1,532
Gain on extinguishment of debt	'	'	'	'	'	'	'	'	0	0	1,039
Nonoperating Income (Expense)	'	'	'	'	'	'	'	'	-68,698	-75,937	-58,761
Income from continuing operations	14,158	18,688	18,279	20,365	12,633	10,222	19,579	17,707	71,490	60,141	84,050
Discontinued operations:	'	'	'	'	'	'	'	'	'	'	'
Operating income, excluding impairment loss	'	'	'	'	'	'	'	'	2,363	5,501	18,349
Impairment loss	'	'	'	'	'	'	'	'	-6,402	0	0
Gain on sale of real estate assets	'	'	'	'	'	'	'	'	31,292	27,577	122,657
Income from discontinued operations	15,468	412	17,083	-5,710	1,809	612	11,133	19,524	27,253	33,078	141,006
Net income	'	'	'	'	'	'	'	'	98,743	93,219	225,056
Less: Net income attributable to noncontrolling interest	'	'	'	'	'	'	'	'	-15	-15	-15
Net income attributable to Piedmont	29,623	19,096	35,358	14,651	14,438	10,830	30,708	37,228	98,728	93,204	225,041
Issuer [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues:	'	'	'	'	'	'	'	'	'	'	'
Rental income	'	'	'	'	'	'	'	'	77,200	72,072	67,669
Tenant reimbursements	'	'	'	'	'	'	'	'	16,526	17,100	18,539
Property management fee revenue	'	'	'	'	'	'	'	'	0	0	0
Total revenues	'	'	'	'	'	'	'	'	93,726	89,172	86,208
Expenses:	'	'	'	'	'	'	'	'	'	'	'
Property operating costs	'	'	'	'	'	'	'	'	41,833	36,486	40,311
Depreciation	'	'	'	'	'	'	'	'	23,857	23,456	21,148
Amortization	'	'	'	'	'	'	'	'	5,297	5,524	4,860
Impairment loss	'	'	'	'	'	'	'	'	1,242	'	'
General and administrative	'	'	'	'	'	'	'	'	21,011	19,804	25,029
Operating Expenses	'	'	'	'	'	'	'	'	93,240	85,270	91,348
Real estate operating income	'	'	'	'	'	'	'	'	486	3,902	-5,140
Other income (expense):	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	-22,242	-12,530	-8,991
Interest income and other income/(expense)	'	'	'	'	'	'	'	'	10,630	12,226	11,975
Litigation settlement recovery/(expense)	'	'	'	'	'	'	'	'	1,250	-7,500	'
Net casualty recoveries/(loss)	'	'	'	'	'	'	'	'	-567	-5,195	'
Equity in income/(loss) of unconsolidated joint ventures	'	'	'	'	'	'	'	'	-3,676	923	1,619
Loss on consolidation	'	'	'	'	'	'	'	'	-898	'	0
Gain on extinguishment of debt	'	'	'	'	'	'	'	'	'	'	0
Nonoperating Income (Expense)	'	'	'	'	'	'	'	'	-15,503	-12,076	4,603
Income from continuing operations	'	'	'	'	'	'	'	'	-15,017	-8,174	-537
Discontinued operations:	'	'	'	'	'	'	'	'	'	'	'
Operating income, excluding impairment loss	'	'	'	'	'	'	'	'	1,755	5,220	6,842
Impairment loss	'	'	'	'	'	'	'	'	-6,402	'	'
Gain on sale of real estate assets	'	'	'	'	'	'	'	'	15,046	27,577	12,152
Income from discontinued operations	'	'	'	'	'	'	'	'	10,399	32,797	18,994
Net income	'	'	'	'	'	'	'	'	-4,618	24,623	18,457
Less: Net income attributable to noncontrolling interest	'	'	'	'	'	'	'	'	0	0	0
Net income attributable to Piedmont	'	'	'	'	'	'	'	'	-4,618	24,623	18,457
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	'	'	'	'	'	'	'	'	0	'	'
General and administrative	'	'	'	'	'	'	'	'	337	294	-50
Operating Expenses	'	'	'	'	'	'	'	'	337	294	-50
Real estate operating income	'	'	'	'	'	'	'	'	-337	-294	50
Other income (expense):	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	0	0	0
Interest income and other income/(expense)	'	'	'	'	'	'	'	'	164	15	0
Litigation settlement recovery/(expense)	'	'	'	'	'	'	'	'	0	0	'
Net casualty recoveries/(loss)	'	'	'	'	'	'	'	'	0	0	'
Equity in income/(loss) of unconsolidated joint ventures	'	'	'	'	'	'	'	'	0	0	0
Loss on consolidation	'	'	'	'	'	'	'	'	0	'	0
Gain on extinguishment of debt	'	'	'	'	'	'	'	'	'	'	0
Nonoperating Income (Expense)	'	'	'	'	'	'	'	'	164	15	0
Income from continuing operations	'	'	'	'	'	'	'	'	-173	-279	50
Discontinued operations:	'	'	'	'	'	'	'	'	'	'	'
Operating income, excluding impairment loss	'	'	'	'	'	'	'	'	0	0	0
Impairment loss	'	'	'	'	'	'	'	'	0	'	'
Gain on sale of real estate assets	'	'	'	'	'	'	'	'	0	0	0
Income from discontinued operations	'	'	'	'	'	'	'	'	0	0	0
Net income	'	'	'	'	'	'	'	'	-173	-279	50
Less: Net income attributable to noncontrolling interest	'	'	'	'	'	'	'	'	0	0	0
Net income attributable to Piedmont	'	'	'	'	'	'	'	'	-173	-279	50
Non-Guarantor Subsidiaries [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues:	'	'	'	'	'	'	'	'	'	'	'
Rental income	'	'	'	'	'	'	'	'	375,769	348,713	343,492
Tenant reimbursements	'	'	'	'	'	'	'	'	88,461	89,937	95,313
Property management fee revenue	'	'	'	'	'	'	'	'	15,360	14,350	14,474
Total revenues	'	'	'	'	'	'	'	'	479,590	453,000	453,279
Expenses:	'	'	'	'	'	'	'	'	'	'	'
Property operating costs	'	'	'	'	'	'	'	'	200,472	189,665	177,566
Depreciation	'	'	'	'	'	'	'	'	98,705	86,903	79,538
Amortization	'	'	'	'	'	'	'	'	40,354	44,038	49,148
Impairment loss	'	'	'	'	'	'	'	'	0	'	'
General and administrative	'	'	'	'	'	'	'	'	24,927	23,574	24,570
Operating Expenses	'	'	'	'	'	'	'	'	364,458	344,180	330,822
Real estate operating income	'	'	'	'	'	'	'	'	115,132	108,820	122,457
Other income (expense):	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	-63,900	-65,001	-70,526
Interest income and other income/(expense)	'	'	'	'	'	'	'	'	-587	1,100	4,591
Litigation settlement recovery/(expense)	'	'	'	'	'	'	'	'	0	0	'
Net casualty recoveries/(loss)	'	'	'	'	'	'	'	'	11,128	25	'
Equity in income/(loss) of unconsolidated joint ventures	'	'	'	'	'	'	'	'	0	0	0
Loss on consolidation	'	'	'	'	'	'	'	'	0	'	1,532
Gain on extinguishment of debt	'	'	'	'	'	'	'	'	'	'	1,039
Nonoperating Income (Expense)	'	'	'	'	'	'	'	'	-53,359	-63,876	-63,364
Income from continuing operations	'	'	'	'	'	'	'	'	61,773	44,944	59,093
Discontinued operations:	'	'	'	'	'	'	'	'	'	'	'
Operating income, excluding impairment loss	'	'	'	'	'	'	'	'	608	281	11,507
Impairment loss	'	'	'	'	'	'	'	'	0	'	'
Gain on sale of real estate assets	'	'	'	'	'	'	'	'	16,246	0	110,505
Income from discontinued operations	'	'	'	'	'	'	'	'	16,854	281	122,012
Net income	'	'	'	'	'	'	'	'	78,627	45,225	181,105
Less: Net income attributable to noncontrolling interest	'	'	'	'	'	'	'	'	-15	-15	-15
Net income attributable to Piedmont	'	'	'	'	'	'	'	'	78,612	45,210	181,090
Eliminations [Member]	'	'	'	'	'	'	'	'	'	'	'
Revenues:	'	'	'	'	'	'	'	'	'	'	'
Rental income	'	'	'	'	'	'	'	'	-5,282	-4,813	-1,450
Tenant reimbursements	'	'	'	'	'	'	'	'	-420	-283	-39
Property management fee revenue	'	'	'	'	'	'	'	'	-13,109	-12,032	-12,890
Total revenues	'	'	'	'	'	'	'	'	-18,811	-17,128	-14,379
Expenses:	'	'	'	'	'	'	'	'	'	'	'
Property operating costs	'	'	'	'	'	'	'	'	-19,326	-17,871	-15,346
Depreciation	'	'	'	'	'	'	'	'	0	0	0
Amortization	'	'	'	'	'	'	'	'	0	0	0
Impairment loss	'	'	'	'	'	'	'	'	0	'	'
General and administrative	'	'	'	'	'	'	'	'	-24,392	-22,907	-24,477
Operating Expenses	'	'	'	'	'	'	'	'	-43,718	-40,778	-39,823
Real estate operating income	'	'	'	'	'	'	'	'	24,907	23,650	25,444
Other income (expense):	'	'	'	'	'	'	'	'	'	'	'
Interest expense	'	'	'	'	'	'	'	'	12,559	12,508	13,700
Interest income and other income/(expense)	'	'	'	'	'	'	'	'	-12,559	-12,508	-13,700
Litigation settlement recovery/(expense)	'	'	'	'	'	'	'	'	0	0	'
Net casualty recoveries/(loss)	'	'	'	'	'	'	'	'	0	0	'
Equity in income/(loss) of unconsolidated joint ventures	'	'	'	'	'	'	'	'	0	0	0
Loss on consolidation	'	'	'	'	'	'	'	'	0	'	0
Gain on extinguishment of debt	'	'	'	'	'	'	'	'	'	'	0
Nonoperating Income (Expense)	'	'	'	'	'	'	'	'	0	0	0
Income from continuing operations	'	'	'	'	'	'	'	'	24,907	23,650	25,444
Discontinued operations:	'	'	'	'	'	'	'	'	'	'	'
Operating income, excluding impairment loss	'	'	'	'	'	'	'	'	0	0	0
Impairment loss	'	'	'	'	'	'	'	'	0	'	'
Gain on sale of real estate assets	'	'	'	'	'	'	'	'	0	0	0
Income from discontinued operations	'	'	'	'	'	'	'	'	0	0	0
Net income	'	'	'	'	'	'	'	'	24,907	23,650	25,444
Less: Net income attributable to noncontrolling interest	'	'	'	'	'	'	'	'	0	0	0
Net income attributable to Piedmont	'	'	'	'	'	'	'	'	$24,907	$23,650	$25,444

Guarantor_Financials_Guarantor1

Guarantor Financials Guarantor and Non-Guarantor Financial Information - Condensed Consolidated Statements of Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net Cash Provided by Operating Activities	$215,079	$220,925	$267,095
Cash Flows from Investing Activities:	'	'	'
Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	-542,170	-108,487	-215,609
Intercompany note receivable	0	0	0
Cash assumed upon consolidation of variable interest entity	0	0	5,063
Acquisition of unconsolidated joint ventures, net of cash assumed	-14,242	0	0
Net sale proceeds from wholly-owned properties and consolidated joint venture	95,671	93,839	291,785
Net sale proceeds received from unconsolidated joint ventures	0	0	3,036
Investments in unconsolidated joint ventures	-793	-136	-151
Liquidation of noncontrolling interest upon sale of consolidated joint venture	0	0	-95
Deferred lease costs paid	-34,298	-48,692	-47,049
Net cash provided/(used in) by investing activities	-495,832	-63,476	36,980
Cash Flows from Financing Activities:	'	'	'
Deferred financing costs paid	-4,892	-3,125	-3,367
Proceeds from debt	1,085,604	409,000	829,000
Repayments of debt	-500,000	-465,000	-822,875
Intercompany note payable	0	0	0
Net costs of issuance of common stock	-91	-229	-252
Repurchases of common stock as part of announced plan	-173,551	-88,450	-3,244
Intercompany distributions	0	0	0
Dividends paid and discount on dividend reinvestments	-132,301	-136,378	-220,365
Net cash provided by/(used in) financing activities	274,769	-284,182	-221,103
Net increase/(decrease) in cash and cash equivalents	-5,984	-126,733	82,972
Cash and cash equivalents, beginning of year	12,957	139,690	56,718
Cash and cash equivalents, end of year	6,973	12,957	139,690
Issuer [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net Cash Provided by Operating Activities	15,327	32,260	34,362
Cash Flows from Investing Activities:	'	'	'
Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	-10,382	-20,763	-15,856
Intercompany note receivable	0	0	0
Cash assumed upon consolidation of variable interest entity	'	'	0
Acquisition of unconsolidated joint ventures, net of cash assumed	18,045	'	'
Net sale proceeds from wholly-owned properties and consolidated joint venture	50,118	93,839	31,704
Net sale proceeds received from unconsolidated joint ventures	'	'	3,036
Investments in unconsolidated joint ventures	-793	-136	-151
Liquidation of noncontrolling interest upon sale of consolidated joint venture	'	'	0
Deferred lease costs paid	-10,980	-4,164	-10,695
Net cash provided/(used in) by investing activities	46,008	68,776	8,038
Cash Flows from Financing Activities:	'	'	'
Deferred financing costs paid	-4,892	-3,125	-2,717
Proceeds from debt	1,085,604	409,000	829,000
Repayments of debt	-500,000	-280,000	-779,000
Intercompany note payable	0	0	-53,000
Net costs of issuance of common stock	0	0	0
Repurchases of common stock as part of announced plan	0	0	0
Intercompany distributions	-701,066	-331,460	68,721
Dividends paid and discount on dividend reinvestments	0	0	0
Net cash provided by/(used in) financing activities	-120,354	-205,585	63,004
Net increase/(decrease) in cash and cash equivalents	-59,019	-104,549	105,404
Cash and cash equivalents, beginning of year	62,371	166,920	61,516
Cash and cash equivalents, end of year	3,352	62,371	166,920
Guarantor [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net Cash Provided by Operating Activities	1,853	2,215	2,375
Cash Flows from Investing Activities:	'	'	'
Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	0	0	0
Intercompany note receivable	500	-2,500	0
Cash assumed upon consolidation of variable interest entity	'	'	0
Acquisition of unconsolidated joint ventures, net of cash assumed	0	'	'
Net sale proceeds from wholly-owned properties and consolidated joint venture	0	0	0
Net sale proceeds received from unconsolidated joint ventures	'	'	0
Investments in unconsolidated joint ventures	0	0	0
Liquidation of noncontrolling interest upon sale of consolidated joint venture	'	'	0
Deferred lease costs paid	0	0	0
Net cash provided/(used in) by investing activities	500	-2,500	0
Cash Flows from Financing Activities:	'	'	'
Deferred financing costs paid	0	0	0
Proceeds from debt	0	0	0
Repayments of debt	0	0	0
Intercompany note payable	0	0	0
Net costs of issuance of common stock	-91	-229	-252
Repurchases of common stock as part of announced plan	-173,551	-88,450	-3,244
Intercompany distributions	303,486	225,427	218,322
Dividends paid and discount on dividend reinvestments	-132,286	-136,363	-217,958
Net cash provided by/(used in) financing activities	-2,442	385	-3,132
Net increase/(decrease) in cash and cash equivalents	-89	100	-757
Cash and cash equivalents, beginning of year	239	139	896
Cash and cash equivalents, end of year	150	239	139
Non-Guarantor Subsidiaries [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net Cash Provided by Operating Activities	172,992	162,800	204,913
Cash Flows from Investing Activities:	'	'	'
Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	-532,088	-87,724	-199,753
Intercompany note receivable	0	0	53,000
Cash assumed upon consolidation of variable interest entity	'	'	5,063
Acquisition of unconsolidated joint ventures, net of cash assumed	-32,287	'	'
Net sale proceeds from wholly-owned properties and consolidated joint venture	45,553	0	260,081
Net sale proceeds received from unconsolidated joint ventures	'	'	0
Investments in unconsolidated joint ventures	0	0	0
Liquidation of noncontrolling interest upon sale of consolidated joint venture	'	'	-95
Deferred lease costs paid	-23,318	-44,528	-36,354
Net cash provided/(used in) by investing activities	-542,140	-132,252	81,942
Cash Flows from Financing Activities:	'	'	'
Deferred financing costs paid	0	0	-650
Proceeds from debt	0	0	0
Repayments of debt	0	-185,000	-43,875
Intercompany note payable	-500	2,500	0
Net costs of issuance of common stock	0	0	0
Repurchases of common stock as part of announced plan	0	0	0
Intercompany distributions	422,787	129,683	-261,598
Dividends paid and discount on dividend reinvestments	-15	-15	-2,407
Net cash provided by/(used in) financing activities	422,272	-52,832	-308,530
Net increase/(decrease) in cash and cash equivalents	53,124	-22,284	-21,675
Cash and cash equivalents, beginning of year	-49,653	-27,369	-5,694
Cash and cash equivalents, end of year	3,471	-49,653	-27,369
Eliminations [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
Net Cash Provided by Operating Activities	24,907	23,650	25,445
Cash Flows from Investing Activities:	'	'	'
Acquisition of real estate assets, related intangibles and capitalized expenditures, net of accruals	300	0	0
Intercompany note receivable	-500	2,500	-53,000
Cash assumed upon consolidation of variable interest entity	'	'	0
Acquisition of unconsolidated joint ventures, net of cash assumed	0	'	'
Net sale proceeds from wholly-owned properties and consolidated joint venture	0	0	0
Net sale proceeds received from unconsolidated joint ventures	'	'	0
Investments in unconsolidated joint ventures	0	0	0
Liquidation of noncontrolling interest upon sale of consolidated joint venture	'	'	0
Deferred lease costs paid	0	0	0
Net cash provided/(used in) by investing activities	-200	2,500	-53,000
Cash Flows from Financing Activities:	'	'	'
Deferred financing costs paid	0	0	0
Proceeds from debt	0	0	0
Repayments of debt	0	0	0
Intercompany note payable	500	-2,500	53,000
Net costs of issuance of common stock	0	0	0
Repurchases of common stock as part of announced plan	0	0	0
Intercompany distributions	-25,207	-23,650	-25,445
Dividends paid and discount on dividend reinvestments	0	0	0
Net cash provided by/(used in) financing activities	-24,707	-26,150	27,555
Net increase/(decrease) in cash and cash equivalents	0	0	0
Cash and cash equivalents, beginning of year	0	0	0
Cash and cash equivalents, end of year	$0	$0	$0

Subsequent_Events_Details

Subsequent Events (Details) (Subsequent Event [Member], USD $)	0 Months Ended
In Millions, except Per Share data, unless otherwise specified	Feb. 05, 2014	Jan. 31, 2014
		11107 and 11109 Sunset Hills Road [Member]
Subsequent Event [Line Items]	'	'
Dividends declared (in dollars per share)	$0.20	'
Contractual Selling Price (in millions)	'	$22.60

Schedule_III_Real_Estate_Asset1

Schedule III - Real Estate Assets and Accumulated Depreciation (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Initial Cost, Land	$652,903,000		'		'
Initial Cost, Buildings and Improvements	4,092,003,000		'		'
Initial Cost, Total	4,744,906,000		'		'
Costs Capitalized Subsequent to Acquisition	293,099,000		'		'
Gross Amount at Which Carried, Land	691,433,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	4,346,572,000		'		'
Gross Amount at Which Carried, Total	5,038,005,000		4,648,904,000		4,699,311,000
Accumulated Depreciation and Amortization	1,060,885,000		977,768,000		935,716,000
Real Estate:	'		'		'
Balance at the beginning of the year	4,648,904,000		4,699,311,000		4,666,188,000
Additions to/improvements of real estate	541,701,000		108,131,000		440,141,000
Assets disposed	-133,249,000		-77,768,000		-361,397,000
Assets impaired	-1,242,000		0		0
Write-offs of intangible assets	-12,080,000	[1]	-73,632,000	[1]	-35,916,000	[1]
Write-offs of fully depreciated/amortized assets	-6,029,000		-7,138,000		-9,705,000
Balance at the end of the year	5,038,005,000		4,648,904,000		4,699,311,000
Accumulated Depreciation and Amortization:	'		'		'
Balance at the beginning of the year	977,768,000		935,716,000		918,578,000
Depreciation and amortization expense	140,637,000		139,196,000		147,440,000
Assets disposed	-39,411,000		-16,374,000		-84,681,000
Write-offs of intangible assets	-12,080,000	[1]	-73,632,000	[1]	-35,916,000	[1]
Write-offs of fully depreciated/amortized assets	-6,029,000		-7,138,000		-9,705,000
Balance at the end of the year	1,060,885,000		977,768,000		935,716,000
Building [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Useful life	'40 years		'		'
Eye Street 1225 NW Associates LLC [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Piedmont’s % Ownership of Entity	49.50%		'		'
Eye Street 1201 NW Associates LLC [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Piedmont’s % Ownership of Entity	49.50%		'		'
1225 Equity LLC [Member] | Eye Street 1225 NW Associates LLC [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Piedmont’s % Ownership of Entity	49.50%		'		'
1201 Equity LLC [Member] | Eye Street 1201 NW Associates LLC [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Piedmont’s % Ownership of Entity	49.50%		'		'
Secured Debt [Member] | $350.0 Million Secured Pooled Facility [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Debt instrument, face amount	350,000,000		'		'
Wholly Owned Properties [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Initial Cost, Land	650,349,000		'		'
Initial Cost, Buildings and Improvements	4,058,105,000		'		'
Initial Cost, Total	4,708,454,000		'		'
Costs Capitalized Subsequent to Acquisition	295,283,000		'		'
Gross Amount at Which Carried, Land	688,761,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	4,314,976,000		'		'
Gross Amount at Which Carried, Total	5,003,737,000		'		'
Accumulated Depreciation and Amortization	1,051,754,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	5,003,737,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	1,051,754,000		'		'
Partially Owned Properties [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Initial Cost, Land	2,554,000		'		'
Initial Cost, Buildings and Improvements	33,898,000		'		'
Initial Cost, Total	36,452,000		'		'
Costs Capitalized Subsequent to Acquisition	-2,184,000		'		'
Gross Amount at Which Carried, Land	2,672,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	31,596,000		'		'
Gross Amount at Which Carried, Total	34,268,000		'		'
Accumulated Depreciation and Amortization	9,131,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	34,268,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	9,131,000		'		'
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		'		'
DALLAS PARKWAY 3900 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,456,000		'		'
Initial Cost, Buildings and Improvements	20,377,000		'		'
Initial Cost, Total	21,837,000		'		'
Costs Capitalized Subsequent to Acquisition	3,050,000		'		'
Gross Amount at Which Carried, Land	1,517,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	23,370,000		'		'
Gross Amount at Which Carried, Total	24,887,000		'		'
Accumulated Depreciation and Amortization	9,499,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	24,887,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	9,499,000		'		'
DALLAS PARKWAY 3900 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
DALLAS PARKWAY 3900 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
RIVER CORPORATE CENTER [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[3]	'		'
Initial Cost, Land	0	[3]	'		'
Initial Cost, Buildings and Improvements	16,036,000	[3]	'		'
Initial Cost, Total	16,036,000	[3]	'		'
Costs Capitalized Subsequent to Acquisition	7,340,000	[3]	'		'
Gross Amount at Which Carried, Land	0	[3]	'		'
Gross Amount at Which Carried, Buildings and Improvements	23,376,000	[3]	'		'
Gross Amount at Which Carried, Total	23,376,000	[3]	'		'
Accumulated Depreciation and Amortization	7,224,000	[3]	'		'
Real Estate:	'		'		'
Balance at the end of the year	23,376,000	[3]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	7,224,000	[3]	'		'
RIVER CORPORATE CENTER [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[3]	'		'
RIVER CORPORATE CENTER [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[3]	'		'
1441 WEST LONG LAKE ROAD [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	2,160,000		'		'
Initial Cost, Buildings and Improvements	16,776,000		'		'
Initial Cost, Total	18,936,000		'		'
Costs Capitalized Subsequent to Acquisition	-6,501,000		'		'
Gross Amount at Which Carried, Land	1,202,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	11,233,000		'		'
Gross Amount at Which Carried, Total	12,435,000		'		'
Accumulated Depreciation and Amortization	7,326,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	12,435,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	7,326,000		'		'
1441 WEST LONG LAKE ROAD [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
1441 WEST LONG LAKE ROAD [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
ENCLAVE PARKWAY 1430 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Encumbrances	32,100,000		'		'
Initial Cost, Land	7,100,000		'		'
Initial Cost, Buildings and Improvements	37,915,000		'		'
Initial Cost, Total	45,015,000		'		'
Costs Capitalized Subsequent to Acquisition	3,699,000		'		'
Gross Amount at Which Carried, Land	5,506,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	43,208,000		'		'
Gross Amount at Which Carried, Total	48,714,000		'		'
Accumulated Depreciation and Amortization	16,010,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	48,714,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	16,010,000		'		'
ENCLAVE PARKWAY 1430 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
ENCLAVE PARKWAY 1430 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CRESCENT RIDGE II [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	7,700,000		'		'
Initial Cost, Buildings and Improvements	45,154,000		'		'
Initial Cost, Total	52,854,000		'		'
Costs Capitalized Subsequent to Acquisition	9,149,000		'		'
Gross Amount at Which Carried, Land	8,021,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	53,982,000		'		'
Gross Amount at Which Carried, Total	62,003,000		'		'
Accumulated Depreciation and Amortization	21,125,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	62,003,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	21,125,000		'		'
CRESCENT RIDGE II [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CRESCENT RIDGE II [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CROWN COLONY DRIVE 1200 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[4]	'		'
Encumbrances	20,200,000	[4]	'		'
Initial Cost, Land	11,042,000	[4]	'		'
Initial Cost, Buildings and Improvements	40,666,000	[4]	'		'
Initial Cost, Total	51,708,000	[4]	'		'
Costs Capitalized Subsequent to Acquisition	2,738,000	[4]	'		'
Gross Amount at Which Carried, Land	11,042,000	[4]	'		'
Gross Amount at Which Carried, Buildings and Improvements	43,404,000	[4]	'		'
Gross Amount at Which Carried, Total	54,446,000	[4]	'		'
Accumulated Depreciation and Amortization	14,268,000	[4]	'		'
Real Estate:	'		'		'
Balance at the end of the year	54,446,000	[4]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	14,268,000	[4]	'		'
CROWN COLONY DRIVE 1200 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[4]	'		'
CROWN COLONY DRIVE 1200 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[4]	'		'
HIATUS ROAD 5601 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,642,000		'		'
Initial Cost, Buildings and Improvements	10,404,000		'		'
Initial Cost, Total	14,046,000		'		'
Costs Capitalized Subsequent to Acquisition	1,721,000		'		'
Gross Amount at Which Carried, Land	3,642,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	12,125,000		'		'
Gross Amount at Which Carried, Total	15,767,000		'		'
Accumulated Depreciation and Amortization	3,978,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	15,767,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	3,978,000		'		'
HIATUS ROAD 5601 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
HIATUS ROAD 5601 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
WINDY POINT I [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Encumbrances	23,400,000		'		'
Initial Cost, Land	4,537,000		'		'
Initial Cost, Buildings and Improvements	31,847,000		'		'
Initial Cost, Total	36,384,000		'		'
Costs Capitalized Subsequent to Acquisition	2,782,000		'		'
Gross Amount at Which Carried, Land	4,537,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	34,629,000		'		'
Gross Amount at Which Carried, Total	39,166,000		'		'
Accumulated Depreciation and Amortization	11,233,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	39,166,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	11,233,000		'		'
WINDY POINT I [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
WINDY POINT I [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
WINDY POINT II [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Encumbrances	40,300,000		'		'
Initial Cost, Land	3,746,000		'		'
Initial Cost, Buildings and Improvements	55,026,000		'		'
Initial Cost, Total	58,772,000		'		'
Costs Capitalized Subsequent to Acquisition	16,702,000		'		'
Gross Amount at Which Carried, Land	3,746,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	71,728,000		'		'
Gross Amount at Which Carried, Total	75,474,000		'		'
Accumulated Depreciation and Amortization	18,648,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	75,474,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	18,648,000		'		'
WINDY POINT II [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
WINDY POINT II [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
SARASOTA COMMERCE CENTER II [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,767,000		'		'
Initial Cost, Buildings and Improvements	20,533,000		'		'
Initial Cost, Total	22,300,000		'		'
Costs Capitalized Subsequent to Acquisition	2,310,000		'		'
Gross Amount at Which Carried, Land	2,203,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	22,407,000		'		'
Gross Amount at Which Carried, Total	24,610,000		'		'
Accumulated Depreciation and Amortization	7,455,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	24,610,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	7,455,000		'		'
SARASOTA COMMERCE CENTER II [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
SARASOTA COMMERCE CENTER II [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
JOHNS CREEK PARKWAY 11695 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	2,080,000		'		'
Initial Cost, Buildings and Improvements	13,572,000		'		'
Initial Cost, Total	15,652,000		'		'
Costs Capitalized Subsequent to Acquisition	1,833,000		'		'
Gross Amount at Which Carried, Land	2,081,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	15,404,000		'		'
Gross Amount at Which Carried, Total	17,485,000		'		'
Accumulated Depreciation and Amortization	5,292,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	17,485,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	5,292,000		'		'
JOHNS CREEK PARKWAY 11695 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
JOHNS CREEK PARKWAY 11695 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
BROOKSIDE PARKWAY 3750 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,561,000		'		'
Initial Cost, Buildings and Improvements	14,207,000		'		'
Initial Cost, Total	15,768,000		'		'
Costs Capitalized Subsequent to Acquisition	218,000		'		'
Gross Amount at Which Carried, Land	1,561,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	14,425,000		'		'
Gross Amount at Which Carried, Total	15,986,000		'		'
Accumulated Depreciation and Amortization	4,548,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	15,986,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	4,548,000		'		'
BROOKSIDE PARKWAY 3750 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
BROOKSIDE PARKWAY 3750 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
NW 64TH STREET 2001 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[3]	'		'
Initial Cost, Land	0	[3]	'		'
Initial Cost, Buildings and Improvements	7,172,000	[3]	'		'
Initial Cost, Total	7,172,000	[3]	'		'
Costs Capitalized Subsequent to Acquisition	967,000	[3]	'		'
Gross Amount at Which Carried, Land	0	[3]	'		'
Gross Amount at Which Carried, Buildings and Improvements	8,139,000	[3]	'		'
Gross Amount at Which Carried, Total	8,139,000	[3]	'		'
Accumulated Depreciation and Amortization	2,487,000	[3]	'		'
Real Estate:	'		'		'
Balance at the end of the year	8,139,000	[3]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	2,487,000	[3]	'		'
NW 64TH STREET 2001 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[3]	'		'
NW 64TH STREET 2001 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[3]	'		'
CENTRAL STREET 90 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,642,000		'		'
Initial Cost, Buildings and Improvements	29,497,000		'		'
Initial Cost, Total	33,139,000		'		'
Costs Capitalized Subsequent to Acquisition	3,001,000		'		'
Gross Amount at Which Carried, Land	3,642,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	32,498,000		'		'
Gross Amount at Which Carried, Total	36,140,000		'		'
Accumulated Depreciation and Amortization	10,967,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	36,140,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	10,967,000		'		'
CENTRAL STREET 90 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CENTRAL STREET 90 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
DESERT CANYON 300 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	2,602,000		'		'
Initial Cost, Buildings and Improvements	24,333,000		'		'
Initial Cost, Total	26,935,000		'		'
Costs Capitalized Subsequent to Acquisition	46,000		'		'
Gross Amount at Which Carried, Land	2,602,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	24,379,000		'		'
Gross Amount at Which Carried, Total	26,981,000		'		'
Accumulated Depreciation and Amortization	7,500,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	26,981,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	7,500,000		'		'
DESERT CANYON 300 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
DESERT CANYON 300 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CONNECTION DRIVE 6031 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,157,000		'		'
Initial Cost, Buildings and Improvements	43,656,000		'		'
Initial Cost, Total	46,813,000		'		'
Costs Capitalized Subsequent to Acquisition	3,477,000		'		'
Gross Amount at Which Carried, Land	3,157,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	47,133,000		'		'
Gross Amount at Which Carried, Total	50,290,000		'		'
Accumulated Depreciation and Amortization	14,040,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	50,290,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	14,040,000		'		'
CONNECTION DRIVE 6031 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CONNECTION DRIVE 6031 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CONNECTION DRIVE 6021 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,157,000		'		'
Initial Cost, Buildings and Improvements	42,662,000		'		'
Initial Cost, Total	45,819,000		'		'
Costs Capitalized Subsequent to Acquisition	172,000		'		'
Gross Amount at Which Carried, Land	3,157,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	42,834,000		'		'
Gross Amount at Which Carried, Total	45,991,000		'		'
Accumulated Depreciation and Amortization	12,808,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	45,991,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	12,808,000		'		'
CONNECTION DRIVE 6021 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CONNECTION DRIVE 6021 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CONNECTION DRIVE 6011 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,157,000		'		'
Initial Cost, Buildings and Improvements	29,034,000		'		'
Initial Cost, Total	32,191,000		'		'
Costs Capitalized Subsequent to Acquisition	2,586,000		'		'
Gross Amount at Which Carried, Land	3,157,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	31,620,000		'		'
Gross Amount at Which Carried, Total	34,777,000		'		'
Accumulated Depreciation and Amortization	10,338,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	34,777,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	10,338,000		'		'
CONNECTION DRIVE 6011 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CONNECTION DRIVE 6011 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
BRAKER POINTE III [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[4]	'		'
Encumbrances	16,500,000	[4]	'		'
Initial Cost, Land	6,098,000	[4]	'		'
Initial Cost, Buildings and Improvements	34,492,000	[4]	'		'
Initial Cost, Total	40,590,000	[4]	'		'
Costs Capitalized Subsequent to Acquisition	1,000	[4]	'		'
Gross Amount at Which Carried, Land	6,099,000	[4]	'		'
Gross Amount at Which Carried, Buildings and Improvements	34,492,000	[4]	'		'
Gross Amount at Which Carried, Total	40,591,000	[4]	'		'
Accumulated Depreciation and Amortization	10,387,000	[4]	'		'
Real Estate:	'		'		'
Balance at the end of the year	40,591,000	[4]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	10,387,000	[4]	'		'
BRAKER POINTE III [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[4]	'		'
BRAKER POINTE III [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[4]	'		'
CHANDLER FORUM [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	2,632,000		'		'
Initial Cost, Buildings and Improvements	0		'		'
Initial Cost, Total	2,632,000		'		'
Costs Capitalized Subsequent to Acquisition	19,963,000		'		'
Gross Amount at Which Carried, Land	2,779,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	19,816,000		'		'
Gross Amount at Which Carried, Total	22,595,000		'		'
Accumulated Depreciation and Amortization	6,908,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	22,595,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	6,908,000		'		'
CHANDLER FORUM [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CHANDLER FORUM [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
GATEHALL DRIVE 2 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[4]	'		'
Encumbrances	42,700,000	[4]	'		'
Initial Cost, Land	9,054,000	[4]	'		'
Initial Cost, Buildings and Improvements	96,722,000	[4]	'		'
Initial Cost, Total	105,776,000	[4]	'		'
Costs Capitalized Subsequent to Acquisition	6,448,000	[4]	'		'
Gross Amount at Which Carried, Land	9,054,000	[4]	'		'
Gross Amount at Which Carried, Buildings and Improvements	103,170,000	[4]	'		'
Gross Amount at Which Carried, Total	112,224,000	[4]	'		'
Accumulated Depreciation and Amortization	29,388,000	[4]	'		'
Real Estate:	'		'		'
Balance at the end of the year	112,224,000	[4]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	29,388,000	[4]	'		'
GATEHALL DRIVE 2 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[4]	'		'
GATEHALL DRIVE 2 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[4]	'		'
HEADQUARTERS DRIVE 5601 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,153,000		'		'
Initial Cost, Buildings and Improvements	24,602,000		'		'
Initial Cost, Total	27,755,000		'		'
Costs Capitalized Subsequent to Acquisition	2,663,000		'		'
Gross Amount at Which Carried, Land	3,153,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	27,265,000		'		'
Gross Amount at Which Carried, Total	30,418,000		'		'
Accumulated Depreciation and Amortization	7,591,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	30,418,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	7,591,000		'		'
HEADQUARTERS DRIVE 5601 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years		'		'
HEADQUARTERS DRIVE 5601 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years		'		'
TWO INDEPENDENCE SQUARE [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[4]	'		'
Encumbrances	105,800,000	[4]	'		'
Initial Cost, Land	52,711,000	[4]	'		'
Initial Cost, Buildings and Improvements	202,702,000	[4]	'		'
Initial Cost, Total	255,413,000	[4]	'		'
Costs Capitalized Subsequent to Acquisition	49,791,000	[4]	'		'
Gross Amount at Which Carried, Land	52,711,000	[4]	'		'
Gross Amount at Which Carried, Buildings and Improvements	252,493,000	[4]	'		'
Gross Amount at Which Carried, Total	305,204,000	[4]	'		'
Accumulated Depreciation and Amortization	62,617,000	[4]	'		'
Real Estate:	'		'		'
Balance at the end of the year	305,204,000	[4]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	62,617,000	[4]	'		'
TWO INDEPENDENCE SQUARE [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[4]	'		'
TWO INDEPENDENCE SQUARE [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[4]	'		'
ONE INDEPENDENCE SQUARE [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[4]	'		'
Encumbrances	57,800,000	[4]	'		'
Initial Cost, Land	29,765,000	[4]	'		'
Initial Cost, Buildings and Improvements	104,814,000	[4]	'		'
Initial Cost, Total	134,579,000	[4]	'		'
Costs Capitalized Subsequent to Acquisition	3,145,000	[4]	'		'
Gross Amount at Which Carried, Land	30,562,000	[4]	'		'
Gross Amount at Which Carried, Buildings and Improvements	107,162,000	[4]	'		'
Gross Amount at Which Carried, Total	137,724,000	[4]	'		'
Accumulated Depreciation and Amortization	31,167,000	[4]	'		'
Real Estate:	'		'		'
Balance at the end of the year	137,724,000	[4]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	31,167,000	[4]	'		'
ONE INDEPENDENCE SQUARE [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[4]	'		'
ONE INDEPENDENCE SQUARE [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[4]	'		'
WEST END AVENUE 2120 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[4]	'		'
Encumbrances	26,800,000	[4]	'		'
Initial Cost, Land	4,908,000	[4]	'		'
Initial Cost, Buildings and Improvements	59,011,000	[4]	'		'
Initial Cost, Total	63,919,000	[4]	'		'
Costs Capitalized Subsequent to Acquisition	6,671,000	[4]	'		'
Gross Amount at Which Carried, Land	5,100,000	[4]	'		'
Gross Amount at Which Carried, Buildings and Improvements	65,490,000	[4]	'		'
Gross Amount at Which Carried, Total	70,590,000	[4]	'		'
Accumulated Depreciation and Amortization	19,586,000	[4]	'		'
Real Estate:	'		'		'
Balance at the end of the year	70,590,000	[4]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	19,586,000	[4]	'		'
WEST END AVENUE 2120 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[4]	'		'
WEST END AVENUE 2120 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[4]	'		'
NORTH BRAND BOULEVARD 800 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	23,605,000		'		'
Initial Cost, Buildings and Improvements	136,284,000		'		'
Initial Cost, Total	159,889,000		'		'
Costs Capitalized Subsequent to Acquisition	9,288,000		'		'
Gross Amount at Which Carried, Land	23,607,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	145,570,000		'		'
Gross Amount at Which Carried, Total	169,177,000		'		'
Accumulated Depreciation and Amortization	43,804,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	169,177,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	43,804,000		'		'
NORTH BRAND BOULEVARD 800 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
NORTH BRAND BOULEVARD 800 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
EASTPOINT I [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,485,000		'		'
Initial Cost, Buildings and Improvements	11,064,000		'		'
Initial Cost, Total	12,549,000		'		'
Costs Capitalized Subsequent to Acquisition	2,221,000		'		'
Gross Amount at Which Carried, Land	1,485,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	13,285,000		'		'
Gross Amount at Which Carried, Total	14,770,000		'		'
Accumulated Depreciation and Amortization	3,277,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	14,770,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	3,277,000		'		'
EASTPOINT I [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
EASTPOINT I [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
EASTPOINT II [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,235,000		'		'
Initial Cost, Buildings and Improvements	9,199,000		'		'
Initial Cost, Total	10,434,000		'		'
Costs Capitalized Subsequent to Acquisition	1,929,000		'		'
Gross Amount at Which Carried, Land	1,235,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	11,128,000		'		'
Gross Amount at Which Carried, Total	12,363,000		'		'
Accumulated Depreciation and Amortization	3,544,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	12,363,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	3,544,000		'		'
EASTPOINT II [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
EASTPOINT II [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
WEST JEFFERSON 150 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	9,759,000		'		'
Initial Cost, Buildings and Improvements	88,364,000		'		'
Initial Cost, Total	98,123,000		'		'
Costs Capitalized Subsequent to Acquisition	3,166,000		'		'
Gross Amount at Which Carried, Land	9,759,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	91,530,000		'		'
Gross Amount at Which Carried, Total	101,289,000		'		'
Accumulated Depreciation and Amortization	26,218,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	101,289,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	26,218,000		'		'
WEST JEFFERSON 150 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
WEST JEFFERSON 150 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
US BANCORP CENTER [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Encumbrances	105,000,000		'		'
Initial Cost, Land	11,138,000		'		'
Initial Cost, Buildings and Improvements	175,629,000		'		'
Initial Cost, Total	186,767,000		'		'
Costs Capitalized Subsequent to Acquisition	9,568,000		'		'
Gross Amount at Which Carried, Land	11,138,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	185,197,000		'		'
Gross Amount at Which Carried, Total	196,335,000		'		'
Accumulated Depreciation and Amortization	50,521,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	196,335,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	50,521,000		'		'
US BANCORP CENTER [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
US BANCORP CENTER [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
AON CENTER [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Encumbrances	225,000,000		'		'
Initial Cost, Land	23,267,000		'		'
Initial Cost, Buildings and Improvements	472,488,000		'		'
Initial Cost, Total	495,755,000		'		'
Costs Capitalized Subsequent to Acquisition	145,536,000		'		'
Gross Amount at Which Carried, Land	23,966,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	617,325,000		'		'
Gross Amount at Which Carried, Total	641,291,000		'		'
Accumulated Depreciation and Amortization	163,035,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	641,291,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	163,035,000		'		'
AON CENTER [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
AON CENTER [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
AUBURN HILLS CORPORATE CENTER [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,978,000		'		'
Initial Cost, Buildings and Improvements	16,570,000		'		'
Initial Cost, Total	18,548,000		'		'
Costs Capitalized Subsequent to Acquisition	-8,331,000		'		'
Gross Amount at Which Carried, Land	1,591,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	8,626,000		'		'
Gross Amount at Which Carried, Total	10,217,000		'		'
Accumulated Depreciation and Amortization	3,908,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	10,217,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	3,908,000		'		'
AUBURN HILLS CORPORATE CENTER [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
AUBURN HILLS CORPORATE CENTER [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
SUNSET HILLS ROAD 11107 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	2,711,000		'		'
Initial Cost, Buildings and Improvements	17,890,000		'		'
Initial Cost, Total	20,601,000		'		'
Costs Capitalized Subsequent to Acquisition	518,000		'		'
Gross Amount at Which Carried, Land	2,711,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	18,408,000		'		'
Gross Amount at Which Carried, Total	21,119,000		'		'
Accumulated Depreciation and Amortization	5,692,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	21,119,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	5,692,000		'		'
SUNSET HILLS ROAD 11107 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
SUNSET HILLS ROAD 11107 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
SUNSET HILLS ROAD 11109 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,218,000		'		'
Initial Cost, Buildings and Improvements	8,038,000		'		'
Initial Cost, Total	9,256,000		'		'
Costs Capitalized Subsequent to Acquisition	-2,723,000		'		'
Gross Amount at Which Carried, Land	1,218,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	5,315,000		'		'
Gross Amount at Which Carried, Total	6,533,000		'		'
Accumulated Depreciation and Amortization	1,644,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	6,533,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	1,644,000		'		'
SUNSET HILLS ROAD 11109 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
SUNSET HILLS ROAD 11109 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CORPORATE BOULEVARD 9211 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,019,000		'		'
Initial Cost, Buildings and Improvements	21,984,000		'		'
Initial Cost, Total	25,003,000		'		'
Costs Capitalized Subsequent to Acquisition	-4,805,000		'		'
Gross Amount at Which Carried, Land	2,960,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	17,238,000		'		'
Gross Amount at Which Carried, Total	20,198,000		'		'
Accumulated Depreciation and Amortization	4,630,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	20,198,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	4,630,000		'		'
CORPORATE BOULEVARD 9211 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CORPORATE BOULEVARD 9211 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CORPORATE BOULEVARD 9221 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,019,000		'		'
Initial Cost, Buildings and Improvements	21,984,000		'		'
Initial Cost, Total	25,003,000		'		'
Costs Capitalized Subsequent to Acquisition	-2,577,000		'		'
Gross Amount at Which Carried, Land	2,960,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	19,466,000		'		'
Gross Amount at Which Carried, Total	22,426,000		'		'
Accumulated Depreciation and Amortization	4,640,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	22,426,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	4,640,000		'		'
CORPORATE BOULEVARD 9221 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CORPORATE BOULEVARD 9221 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
GLENRIDGE HIGHLANDS TWO [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	6,662,000		'		'
Initial Cost, Buildings and Improvements	69,031,000		'		'
Initial Cost, Total	75,693,000		'		'
Costs Capitalized Subsequent to Acquisition	-20,391,000		'		'
Gross Amount at Which Carried, Land	6,662,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	48,640,000		'		'
Gross Amount at Which Carried, Total	55,302,000		'		'
Accumulated Depreciation and Amortization	13,457,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	55,302,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	13,457,000		'		'
GLENRIDGE HIGHLANDS TWO [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
GLENRIDGE HIGHLANDS TWO [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
BRIDGEWATER CROSSING 200 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[4]	'		'
Encumbrances	40,200,000	[4]	'		'
Initial Cost, Land	8,182,000	[4]	'		'
Initial Cost, Buildings and Improvements	84,160,000	[4]	'		'
Initial Cost, Total	92,342,000	[4]	'		'
Costs Capitalized Subsequent to Acquisition	-13,774,000	[4]	'		'
Gross Amount at Which Carried, Land	8,328,000	[4]	'		'
Gross Amount at Which Carried, Buildings and Improvements	70,240,000	[4]	'		'
Gross Amount at Which Carried, Total	78,568,000	[4]	'		'
Accumulated Depreciation and Amortization	16,890,000	[4]	'		'
Real Estate:	'		'		'
Balance at the end of the year	78,568,000	[4]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	16,890,000	[4]	'		'
BRIDGEWATER CROSSING 200 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[4]	'		'
BRIDGEWATER CROSSING 200 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[4]	'		'
EAST COLORADO BOULEVARD 1055 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Encumbrances	29,200,000		'		'
Initial Cost, Land	6,495,000		'		'
Initial Cost, Buildings and Improvements	30,265,000		'		'
Initial Cost, Total	36,760,000		'		'
Costs Capitalized Subsequent to Acquisition	-3,059,000		'		'
Gross Amount at Which Carried, Land	6,495,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	27,206,000		'		'
Gross Amount at Which Carried, Total	33,701,000		'		'
Accumulated Depreciation and Amortization	6,349,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	33,701,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	6,349,000		'		'
EAST COLORADO BOULEVARD 1055 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
EAST COLORADO BOULEVARD 1055 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
FAIRWAY CENTER II [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[4]	'		'
Encumbrances	10,700,000	[4]	'		'
Initial Cost, Land	7,110,000	[4]	'		'
Initial Cost, Buildings and Improvements	15,600,000	[4]	'		'
Initial Cost, Total	22,710,000	[4]	'		'
Costs Capitalized Subsequent to Acquisition	-2,332,000	[4]	'		'
Gross Amount at Which Carried, Land	7,110,000	[4]	'		'
Gross Amount at Which Carried, Buildings and Improvements	13,268,000	[4]	'		'
Gross Amount at Which Carried, Total	20,378,000	[4]	'		'
Accumulated Depreciation and Amortization	3,670,000	[4]	'		'
Real Estate:	'		'		'
Balance at the end of the year	20,378,000	[4]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	3,670,000	[4]	'		'
FAIRWAY CENTER II [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[4]	'		'
FAIRWAY CENTER II [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[4]	'		'
COPPER RIDGE CENTER [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	6,974,000		'		'
Initial Cost, Buildings and Improvements	38,714,000		'		'
Initial Cost, Total	45,688,000		'		'
Costs Capitalized Subsequent to Acquisition	-4,701,000		'		'
Gross Amount at Which Carried, Land	6,974,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	34,013,000		'		'
Gross Amount at Which Carried, Total	40,987,000		'		'
Accumulated Depreciation and Amortization	9,645,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	40,987,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	9,645,000		'		'
COPPER RIDGE CENTER [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
COPPER RIDGE CENTER [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
MAIN STREET 1901 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	6,246,000		'		'
Initial Cost, Buildings and Improvements	36,455,000		'		'
Initial Cost, Total	42,701,000		'		'
Costs Capitalized Subsequent to Acquisition	-6,157,000		'		'
Gross Amount at Which Carried, Land	6,246,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	30,298,000		'		'
Gross Amount at Which Carried, Total	36,544,000		'		'
Accumulated Depreciation and Amortization	7,673,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	36,544,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	7,673,000		'		'
MAIN STREET 1901 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
MAIN STREET 1901 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
VIRGINIA AVE 400 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	22,146,000		'		'
Initial Cost, Buildings and Improvements	49,740,000		'		'
Initial Cost, Total	71,886,000		'		'
Costs Capitalized Subsequent to Acquisition	-1,248,000		'		'
Gross Amount at Which Carried, Land	22,146,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	48,492,000		'		'
Gross Amount at Which Carried, Total	70,638,000		'		'
Accumulated Depreciation and Amortization	12,989,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	70,638,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	12,989,000		'		'
VIRGINIA AVE 400 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
VIRGINIA AVE 400 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
NORTH FAIRFAX DRIVE 4250 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	13,636,000		'		'
Initial Cost, Buildings and Improvements	70,918,000		'		'
Initial Cost, Total	84,554,000		'		'
Costs Capitalized Subsequent to Acquisition	3,892,000		'		'
Gross Amount at Which Carried, Land	13,636,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	74,810,000		'		'
Gross Amount at Which Carried, Total	88,446,000		'		'
Accumulated Depreciation and Amortization	23,169,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	88,446,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	23,169,000		'		'
NORTH FAIRFAX DRIVE 4250 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
NORTH FAIRFAX DRIVE 4250 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
EYE STREET 1225 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	49.50%	[5]	'		'
Encumbrances	57,600,000	[5]	'		'
Initial Cost, Land	21,959,000	[5]	'		'
Initial Cost, Buildings and Improvements	47,602,000	[5]	'		'
Initial Cost, Total	69,561,000	[5]	'		'
Costs Capitalized Subsequent to Acquisition	-1,998,000	[5]	'		'
Gross Amount at Which Carried, Land	21,959,000	[5]	'		'
Gross Amount at Which Carried, Buildings and Improvements	45,604,000	[5]	'		'
Gross Amount at Which Carried, Total	67,563,000	[5]	'		'
Accumulated Depreciation and Amortization	12,749,000	[5]	'		'
Real Estate:	'		'		'
Balance at the end of the year	67,563,000	[5]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	12,749,000	[5]	'		'
EYE STREET 1225 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[5]	'		'
EYE STREET 1225 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[5]	'		'
EYE STREET 1201 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	49.50%	[6]	'		'
Encumbrances	82,400,000	[6]	'		'
Initial Cost, Land	31,985,000	[6]	'		'
Initial Cost, Buildings and Improvements	63,139,000	[6]	'		'
Initial Cost, Total	95,124,000	[6]	'		'
Costs Capitalized Subsequent to Acquisition	-3,089,000	[6]	'		'
Gross Amount at Which Carried, Land	31,985,000	[6]	'		'
Gross Amount at Which Carried, Buildings and Improvements	60,050,000	[6]	'		'
Gross Amount at Which Carried, Total	92,035,000	[6]	'		'
Accumulated Depreciation and Amortization	15,595,000	[6]	'		'
Real Estate:	'		'		'
Balance at the end of the year	92,035,000	[6]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	15,595,000	[6]	'		'
EYE STREET 1201 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[6]	'		'
EYE STREET 1201 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[6]	'		'
MARKET STREET 1901 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	13,584,000		'		'
Initial Cost, Buildings and Improvements	166,683,000		'		'
Initial Cost, Total	180,267,000		'		'
Costs Capitalized Subsequent to Acquisition	31,497,000		'		'
Gross Amount at Which Carried, Land	20,829,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	190,935,000		'		'
Gross Amount at Which Carried, Total	211,764,000		'		'
Accumulated Depreciation and Amortization	49,364,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	211,764,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	49,364,000		'		'
MARKET STREET 1901 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
MARKET STREET 1901 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
BROAD STREET 60 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	32,522,000		'		'
Initial Cost, Buildings and Improvements	168,986,000		'		'
Initial Cost, Total	201,508,000		'		'
Costs Capitalized Subsequent to Acquisition	3,543,000		'		'
Gross Amount at Which Carried, Land	60,708,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	144,343,000		'		'
Gross Amount at Which Carried, Total	205,051,000		'		'
Accumulated Depreciation and Amortization	38,111,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	205,051,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	38,111,000		'		'
BROAD STREET 60 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
BROAD STREET 60 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
MASSACHUSETTS AVENUE 1414 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	4,210,000		'		'
Initial Cost, Buildings and Improvements	35,821,000		'		'
Initial Cost, Total	40,031,000		'		'
Costs Capitalized Subsequent to Acquisition	2,004,000		'		'
Gross Amount at Which Carried, Land	4,365,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	37,670,000		'		'
Gross Amount at Which Carried, Total	42,035,000		'		'
Accumulated Depreciation and Amortization	14,586,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	42,035,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	14,586,000		'		'
MASSACHUSETTS AVENUE 1414 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
MASSACHUSETTS AVENUE 1414 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
ONE BRATTLE SQUARE [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	6,974,000		'		'
Initial Cost, Buildings and Improvements	64,940,000		'		'
Initial Cost, Total	71,914,000		'		'
Costs Capitalized Subsequent to Acquisition	-3,920,000		'		'
Gross Amount at Which Carried, Land	7,113,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	60,881,000		'		'
Gross Amount at Which Carried, Total	67,994,000		'		'
Accumulated Depreciation and Amortization	25,873,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	67,994,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	25,873,000		'		'
ONE BRATTLE SQUARE [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
ONE BRATTLE SQUARE [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CORPORATE DRIVE 600 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,934,000		'		'
Initial Cost, Buildings and Improvements	0		'		'
Initial Cost, Total	3,934,000		'		'
Costs Capitalized Subsequent to Acquisition	16,281,000		'		'
Gross Amount at Which Carried, Land	3,934,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	16,281,000		'		'
Gross Amount at Which Carried, Total	20,215,000		'		'
Accumulated Depreciation and Amortization	5,163,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	20,215,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	5,163,000		'		'
CORPORATE DRIVE 600 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CORPORATE DRIVE 600 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
WEST ENTRANCE DRIVE 1075 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	5,200,000		'		'
Initial Cost, Buildings and Improvements	22,957,000		'		'
Initial Cost, Total	28,157,000		'		'
Costs Capitalized Subsequent to Acquisition	-313,000		'		'
Gross Amount at Which Carried, Land	5,207,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	22,637,000		'		'
Gross Amount at Which Carried, Total	27,844,000		'		'
Accumulated Depreciation and Amortization	5,552,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	27,844,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	5,552,000		'		'
WEST ENTRANCE DRIVE 1075 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
WEST ENTRANCE DRIVE 1075 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CLARENDON BOULEVARD 3100 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	11,700,000		'		'
Initial Cost, Buildings and Improvements	69,705,000		'		'
Initial Cost, Total	81,405,000		'		'
Costs Capitalized Subsequent to Acquisition	-5,127,000		'		'
Gross Amount at Which Carried, Land	11,791,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	64,487,000		'		'
Gross Amount at Which Carried, Total	76,278,000		'		'
Accumulated Depreciation and Amortization	14,653,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	76,278,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	14,653,000		'		'
CLARENDON BOULEVARD 3100 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CLARENDON BOULEVARD 3100 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CORPORATE BOULEVARD 9200 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,730,000		'		'
Initial Cost, Buildings and Improvements	16,608,000		'		'
Initial Cost, Total	20,338,000		'		'
Costs Capitalized Subsequent to Acquisition	-1,402,000		'		'
Gross Amount at Which Carried, Land	3,882,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	15,054,000		'		'
Gross Amount at Which Carried, Total	18,936,000		'		'
Accumulated Depreciation and Amortization	3,383,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	18,936,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	3,383,000		'		'
CORPORATE BOULEVARD 9200 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CORPORATE BOULEVARD 9200 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
BRIDGEWATER CROSSING 400 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[4]	'		'
Encumbrances	29,300,000	[4]	'		'
Initial Cost, Land	10,400,000	[4]	'		'
Initial Cost, Buildings and Improvements	71,052,000	[4]	'		'
Initial Cost, Total	81,452,000	[4]	'		'
Costs Capitalized Subsequent to Acquisition	-7,442,000	[4]	'		'
Gross Amount at Which Carried, Land	10,400,000	[4]	'		'
Gross Amount at Which Carried, Buildings and Improvements	63,610,000	[4]	'		'
Gross Amount at Which Carried, Total	74,010,000	[4]	'		'
Accumulated Depreciation and Amortization	17,839,000	[4]	'		'
Real Estate:	'		'		'
Balance at the end of the year	74,010,000	[4]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	17,839,000	[4]	'		'
BRIDGEWATER CROSSING 400 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[4]	'		'
BRIDGEWATER CROSSING 400 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[4]	'		'
LAS COLINAS CORPORATE CENTER I [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Encumbrances	17,500,000		'		'
Initial Cost, Land	3,912,000		'		'
Initial Cost, Buildings and Improvements	18,830,000		'		'
Initial Cost, Total	22,742,000		'		'
Costs Capitalized Subsequent to Acquisition	-4,791,000		'		'
Gross Amount at Which Carried, Land	2,543,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	15,408,000		'		'
Gross Amount at Which Carried, Total	17,951,000		'		'
Accumulated Depreciation and Amortization	2,946,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	17,951,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	2,946,000		'		'
LAS COLINAS CORPORATE CENTER I [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
LAS COLINAS CORPORATE CENTER I [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
LAS COLINAS CORPORATE CENTER II [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Encumbrances	25,025,000		'		'
Initial Cost, Land	4,496,000		'		'
Initial Cost, Buildings and Improvements	29,881,000		'		'
Initial Cost, Total	34,377,000		'		'
Costs Capitalized Subsequent to Acquisition	-4,908,000		'		'
Gross Amount at Which Carried, Land	2,543,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	26,926,000		'		'
Gross Amount at Which Carried, Total	29,469,000		'		'
Accumulated Depreciation and Amortization	5,501,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	29,469,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	5,501,000		'		'
LAS COLINAS CORPORATE CENTER II [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
LAS COLINAS CORPORATE CENTER II [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
TWO PIERCE PLACE [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	4,370,000		'		'
Initial Cost, Buildings and Improvements	70,632,000		'		'
Initial Cost, Total	75,002,000		'		'
Costs Capitalized Subsequent to Acquisition	1,996,000		'		'
Gross Amount at Which Carried, Land	4,370,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	72,628,000		'		'
Gross Amount at Which Carried, Total	76,998,000		'		'
Accumulated Depreciation and Amortization	19,290,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	76,998,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	19,290,000		'		'
TWO PIERCE PLACE [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
TWO PIERCE PLACE [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
CABOT DRIVE 2300 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	4,390,000		'		'
Initial Cost, Buildings and Improvements	19,549,000		'		'
Initial Cost, Total	23,939,000		'		'
Costs Capitalized Subsequent to Acquisition	-3,558,000		'		'
Gross Amount at Which Carried, Land	4,390,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	15,991,000		'		'
Gross Amount at Which Carried, Total	20,381,000		'		'
Accumulated Depreciation and Amortization	3,908,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	20,381,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	3,908,000		'		'
CABOT DRIVE 2300 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
CABOT DRIVE 2300 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
PIEDMONT POINTE I [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	11,200,000		'		'
Initial Cost, Buildings and Improvements	58,606,000		'		'
Initial Cost, Total	69,806,000		'		'
Costs Capitalized Subsequent to Acquisition	7,351,000		'		'
Gross Amount at Which Carried, Land	11,200,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	65,957,000		'		'
Gross Amount at Which Carried, Total	77,157,000		'		'
Accumulated Depreciation and Amortization	10,566,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	77,157,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	10,566,000		'		'
PIEDMONT POINTE I [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
PIEDMONT POINTE I [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
PIEDMONT POINTE II [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	13,300,000		'		'
Initial Cost, Buildings and Improvements	70,618,000		'		'
Initial Cost, Total	83,918,000		'		'
Costs Capitalized Subsequent to Acquisition	6,638,000		'		'
Gross Amount at Which Carried, Land	13,300,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	77,256,000		'		'
Gross Amount at Which Carried, Total	90,556,000		'		'
Accumulated Depreciation and Amortization	11,059,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	90,556,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	11,059,000		'		'
PIEDMONT POINTE II [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
PIEDMONT POINTE II [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
SUWANEE GATEWAY ONE [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,000,000		'		'
Initial Cost, Buildings and Improvements	6,875,000		'		'
Initial Cost, Total	7,875,000		'		'
Costs Capitalized Subsequent to Acquisition	78,000		'		'
Gross Amount at Which Carried, Land	1,000,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	6,953,000		'		'
Gross Amount at Which Carried, Total	7,953,000		'		'
Accumulated Depreciation and Amortization	581,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	7,953,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	581,000		'		'
SUWANEE GATEWAY ONE [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
SUWANEE GATEWAY ONE [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
ONE MERIDIAN CROSSINGS [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	2,919,000		'		'
Initial Cost, Buildings and Improvements	24,398,000		'		'
Initial Cost, Total	27,317,000		'		'
Costs Capitalized Subsequent to Acquisition	-1,000		'		'
Gross Amount at Which Carried, Land	2,919,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	24,397,000		'		'
Gross Amount at Which Carried, Total	27,316,000		'		'
Accumulated Depreciation and Amortization	2,238,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	27,316,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	2,238,000		'		'
ONE MERIDIAN CROSSINGS [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
ONE MERIDIAN CROSSINGS [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
TWO MERIDIAN CROSSINGS [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	2,661,000		'		'
Initial Cost, Buildings and Improvements	25,742,000		'		'
Initial Cost, Total	28,403,000		'		'
Costs Capitalized Subsequent to Acquisition	215,000		'		'
Gross Amount at Which Carried, Land	2,661,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	25,957,000		'		'
Gross Amount at Which Carried, Total	28,618,000		'		'
Accumulated Depreciation and Amortization	2,394,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	28,618,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	2,394,000		'		'
TWO MERIDIAN CROSSINGS [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
TWO MERIDIAN CROSSINGS [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
W MONROE 500 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	36,990,000		'		'
Initial Cost, Buildings and Improvements	185,113,000		'		'
Initial Cost, Total	222,103,000		'		'
Costs Capitalized Subsequent to Acquisition	4,038,000		'		'
Gross Amount at Which Carried, Land	36,990,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	189,151,000		'		'
Gross Amount at Which Carried, Total	226,141,000		'		'
Accumulated Depreciation and Amortization	13,115,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	226,141,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	13,115,000		'		'
W MONROE 500 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
W MONROE 500 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
THE DUPREE [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	4,080,000		'		'
Initial Cost, Buildings and Improvements	14,310,000		'		'
Initial Cost, Total	18,390,000		'		'
Costs Capitalized Subsequent to Acquisition	420,000		'		'
Gross Amount at Which Carried, Land	4,080,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	14,730,000		'		'
Gross Amount at Which Carried, Total	18,810,000		'		'
Accumulated Depreciation and Amortization	1,708,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	18,810,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	1,708,000		'		'
THE DUPREE [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
THE DUPREE [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
THE MEDICI [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,780,000		'		'
Initial Cost, Buildings and Improvements	11,510,000		'		'
Initial Cost, Total	13,290,000		'		'
Costs Capitalized Subsequent to Acquisition	630,000		'		'
Gross Amount at Which Carried, Land	1,780,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	12,140,000		'		'
Gross Amount at Which Carried, Total	13,920,000		'		'
Accumulated Depreciation and Amortization	853,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	13,920,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	853,000		'		'
THE MEDICI [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
THE MEDICI [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
PRESIDENTIAL WAY 225 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	3,626,000		'		'
Initial Cost, Buildings and Improvements	36,916,000		'		'
Initial Cost, Total	40,542,000		'		'
Costs Capitalized Subsequent to Acquisition	-763,000		'		'
Gross Amount at Which Carried, Land	3,613,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	36,166,000		'		'
Gross Amount at Which Carried, Total	39,779,000		'		'
Accumulated Depreciation and Amortization	3,566,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	39,779,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	3,566,000		'		'
PRESIDENTIAL WAY 225 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
PRESIDENTIAL WAY 225 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
PRESIDENTIAL WAY 235 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	4,154,000		'		'
Initial Cost, Buildings and Improvements	44,048,000		'		'
Initial Cost, Total	48,202,000		'		'
Costs Capitalized Subsequent to Acquisition	-911,000		'		'
Gross Amount at Which Carried, Land	4,138,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	43,153,000		'		'
Gross Amount at Which Carried, Total	47,291,000		'		'
Accumulated Depreciation and Amortization	4,238,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	47,291,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	4,238,000		'		'
PRESIDENTIAL WAY 235 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
PRESIDENTIAL WAY 235 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
400 TOWNPARK [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	2,570,000		'		'
Initial Cost, Buildings and Improvements	20,555,000		'		'
Initial Cost, Total	23,125,000		'		'
Costs Capitalized Subsequent to Acquisition	620,000		'		'
Gross Amount at Which Carried, Land	2,570,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	21,175,000		'		'
Gross Amount at Which Carried, Total	23,745,000		'		'
Accumulated Depreciation and Amortization	1,597,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	23,745,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	1,597,000		'		'
400 TOWNPARK [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
400 TOWNPARK [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
ARLINGTON GATEWAY [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	36,930,000		'		'
Initial Cost, Buildings and Improvements	129,070,000		'		'
Initial Cost, Total	166,000,000		'		'
Costs Capitalized Subsequent to Acquisition	-333,000		'		'
Gross Amount at Which Carried, Land	36,930,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	128,737,000		'		'
Gross Amount at Which Carried, Total	165,667,000		'		'
Accumulated Depreciation and Amortization	5,350,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	165,667,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	5,350,000		'		'
ARLINGTON GATEWAY [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
ARLINGTON GATEWAY [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
5 & 15 WAYSIDE ROAD [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	7,190,000		'		'
Initial Cost, Buildings and Improvements	55,445,000		'		'
Initial Cost, Total	62,635,000		'		'
Costs Capitalized Subsequent to Acquisition	-631,000		'		'
Gross Amount at Which Carried, Land	7,190,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	54,814,000		'		'
Gross Amount at Which Carried, Total	62,004,000		'		'
Accumulated Depreciation and Amortization	1,579,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	62,004,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	1,579,000		'		'
5 & 15 WAYSIDE ROAD [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
5 & 15 WAYSIDE ROAD [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
2020 W. 89th STREET [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,430,000		'		'
Initial Cost, Buildings and Improvements	1,607,000		'		'
Initial Cost, Total	3,037,000		'		'
Costs Capitalized Subsequent to Acquisition	234,000		'		'
Gross Amount at Which Carried, Land	1,430,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	1,841,000		'		'
Gross Amount at Which Carried, Total	3,271,000		'		'
Accumulated Depreciation and Amortization	65,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	3,271,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	65,000		'		'
2020 W. 89th STREET [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
2020 W. 89th STREET [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
MARYLAND WAY 5301 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	5,740,000		'		'
Initial Cost, Buildings and Improvements	9,717,000		'		'
Initial Cost, Total	15,457,000		'		'
Costs Capitalized Subsequent to Acquisition	0		'		'
Gross Amount at Which Carried, Land	5,740,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	9,717,000		'		'
Gross Amount at Which Carried, Total	15,457,000		'		'
Accumulated Depreciation and Amortization	589,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	15,457,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	589,000		'		'
MARYLAND WAY 5301 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
MARYLAND WAY 5301 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
INVESTMENT DRIVE 4685 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	1,200,000		'		'
Initial Cost, Buildings and Improvements	7,840,000		'		'
Initial Cost, Total	9,040,000		'		'
Costs Capitalized Subsequent to Acquisition	135,000		'		'
Gross Amount at Which Carried, Land	1,200,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	7,975,000		'		'
Gross Amount at Which Carried, Total	9,175,000		'		'
Accumulated Depreciation and Amortization	309,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	9,175,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	309,000		'		'
INVESTMENT DRIVE 4685 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
INVESTMENT DRIVE 4685 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
6565 MACARTHUR BLVD [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	4,820,000		'		'
Initial Cost, Buildings and Improvements	37,767,000		'		'
Initial Cost, Total	42,587,000		'		'
Costs Capitalized Subsequent to Acquisition	2,000		'		'
Gross Amount at Which Carried, Land	4,820,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	37,769,000		'		'
Gross Amount at Which Carried, Total	42,589,000		'		'
Accumulated Depreciation and Amortization	71,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	42,589,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	71,000		'		'
6565 MACARTHUR BLVD [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
6565 MACARTHUR BLVD [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
ONE LINCOLN PARK [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	6,640,000		'		'
Initial Cost, Buildings and Improvements	44,810,000		'		'
Initial Cost, Total	51,450,000		'		'
Costs Capitalized Subsequent to Acquisition	0		'		'
Gross Amount at Which Carried, Land	6,640,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	44,810,000		'		'
Gross Amount at Which Carried, Total	51,450,000		'		'
Accumulated Depreciation and Amortization	86,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	51,450,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	86,000		'		'
ONE LINCOLN PARK [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
ONE LINCOLN PARK [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
161 CORPORATE CENTER [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%		'		'
Initial Cost, Land	2,020,000		'		'
Initial Cost, Buildings and Improvements	10,680,000		'		'
Initial Cost, Total	12,700,000		'		'
Costs Capitalized Subsequent to Acquisition	0		'		'
Gross Amount at Which Carried, Land	2,020,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	10,680,000		'		'
Gross Amount at Which Carried, Total	12,700,000		'		'
Accumulated Depreciation and Amortization	19,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	12,700,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	19,000		'		'
161 CORPORATE CENTER [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
161 CORPORATE CENTER [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
PIEDMONT POWER, LLC [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[7]	'		'
Initial Cost, Land	0	[7]	'		'
Initial Cost, Buildings and Improvements	79,000	[7]	'		'
Initial Cost, Total	79,000	[7]	'		'
Costs Capitalized Subsequent to Acquisition	2,501,000	[7]	'		'
Gross Amount at Which Carried, Land	0	[7]	'		'
Gross Amount at Which Carried, Buildings and Improvements	2,580,000	[7]	'		'
Gross Amount at Which Carried, Total	2,580,000	[7]	'		'
Accumulated Depreciation and Amortization	113,000	[7]	'		'
Real Estate:	'		'		'
Balance at the end of the year	2,580,000	[7]	'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	113,000	[7]	'		'
PIEDMONT POWER, LLC [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2],[7]	'		'
PIEDMONT POWER, LLC [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2],[7]	'		'
UNDEVELOPED LAND PARCELS [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	100.00%	[8]	'		'
Initial Cost, Land	6,021,000	[8]	'		'
Initial Cost, Buildings and Improvements	427,000	[8]	'		'
Initial Cost, Total	6,448,000	[8]	'		'
Costs Capitalized Subsequent to Acquisition	6,291,000	[8]	'		'
Gross Amount at Which Carried, Land	12,063,000	[8]	'		'
Gross Amount at Which Carried, Buildings and Improvements	676,000		'		'
Gross Amount at Which Carried, Total	12,739,000	[8]	'		'
Real Estate:	'		'		'
Balance at the end of the year	12,739,000	[8]	'		'
UPLAND DRIVE 8560 [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	72.00%		'		'
Initial Cost, Land	1,954,000		'		'
Initial Cost, Buildings and Improvements	11,216,000		'		'
Initial Cost, Total	13,170,000		'		'
Costs Capitalized Subsequent to Acquisition	1,089,000		'		'
Gross Amount at Which Carried, Land	2,048,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	12,211,000		'		'
Gross Amount at Which Carried, Total	14,259,000		'		'
Accumulated Depreciation and Amortization	3,952,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	14,259,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	3,952,000		'		'
UPLAND DRIVE 8560 [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
UPLAND DRIVE 8560 [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
TWO PARK CENTER [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Ownership Percentage	72.00%		'		'
Initial Cost, Land	600,000		'		'
Initial Cost, Buildings and Improvements	22,682,000		'		'
Initial Cost, Total	23,282,000		'		'
Costs Capitalized Subsequent to Acquisition	-3,273,000		'		'
Gross Amount at Which Carried, Land	624,000		'		'
Gross Amount at Which Carried, Buildings and Improvements	19,385,000		'		'
Gross Amount at Which Carried, Total	20,009,000		'		'
Accumulated Depreciation and Amortization	5,179,000		'		'
Real Estate:	'		'		'
Balance at the end of the year	20,009,000		'		'
Accumulated Depreciation and Amortization:	'		'		'
Balance at the end of the year	$5,179,000		'		'
TWO PARK CENTER [Member] | Minimum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'0 years	[2]	'		'
TWO PARK CENTER [Member] | Maximum [Member]	'		'		'
Real Estate and Accumulated Depreciation [Line Items]	'		'		'
Life on which Depreciation and Amortization is Computed	'40 years	[2]	'		'
[1]	Consists of write-offs of intangible lease assets related to lease restructurings, amendments and terminations.
[2]	Piedmont’s assets are depreciated or amortized using the straight-lined method over the useful lives of the assets by class. Generally, Tenant Improvements are amortized over the shorter of economic life or lease term, 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.
[3]	Property is owned subject to a long-term ground lease.
[4]	These properties collateralize the $350 Million Secured Pooled Facility.
[5]	Piedmont purchased all of the membership interest in 1225 Equity, LLC, which own a 49.5% membership interest in 1225 Eye Street, N.W. Associates, which owns the 1225 Eye Street building. As a result of its ownership of 1225 Equity, LLC, Piedmont owns an approximate 49.5% in the 1225 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.
[6]	Piedmont purchased all of the membership interest in 1201 Equity, LLC, which own a 49.5% membership interest in 1201 Eye Street, N.W. Associates, which owns the 1201 Eye Street building. As a result of its ownership of 1201 Equity, LLC, Piedmont owns an approximate 49.5% in the 1201 Eye Street building. As the controlling member, Piedmont is deemed to have control of the entities and, as such, consolidates the joint ventures.
[7]	Represents solar panels at the 400 Bridgewater Crossing building, which are not included in Piedmont’s total building count.
[8]	Undeveloped Land Parcels are not included in Piedmont’s total building count.