10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

____________________________________________________ 

FORM 10-Q

____________________________________________________  

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT of 1934

For the Quarterly Period Ended September 30, 2013

OR

o TRANSITION REPORT PURSUANT TO SECTION 13 or 15(d) OF THE SECURITIES EXCHANGE ACT of 1934

For the Transition Period From To

Commission file number 001-34626

PIEDMONT OFFICE REALTY TRUST, INC.

(Exact name of registrant as specified in its charter)

 ____________________________________________________ 

Maryland	58-2328421
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

11695 Johns Creek Parkway

Ste. 350

Johns Creek, Georgia 30097

(Address of principal executive offices)

(Zip Code)

(770) 418-8800

(Registrant’s telephone number, including area code)

N/A

(Former name, former address, and former fiscal year, if changed since last report)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes  x    No   o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).    Yes  x No  o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer”, “accelerated filer”, and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large Accelerated filer x	Accelerated filer o
Non-Accelerated filer o     (Do not check if a smaller reporting company)	Smaller reporting company o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes  o No   x

Number of shares outstanding of the Registrant’s

common stock, as of October 30, 2013:

161,112,966 shares

FORM 10-Q

PIEDMONT OFFICE REALTY TRUST, INC.

TABLE OF CONTENTS

			Page No.
PART I.	Financial Statements
	Item 1.	Consolidated Financial Statements	4
		Consolidated Balance Sheets—September 30, 2013 (unaudited) and December 31, 2012	5
		Consolidated Statements of Income for the Three and Nine Months Ended September 30, 2013 (unaudited) and 2012 (unaudited)	6
		Consolidated Statements of Comprehensive Income for the Three and Nine Months Ended September 30, 2013 (unaudited) and 2012 (unaudited)	7
		Consolidated Statements of Stockholders’ Equity for the Year Ended December 31, 2012 and the Nine Months Ended September 30, 2013 (unaudited)	8
		Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2013 (unaudited) and 2012 (unaudited)	9
		Condensed Notes to Consolidated Financial Statements (unaudited)	10
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	33
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	47
	Item 4.	Controls and Procedures	48
PART II.	Other Information
	Item 1.	Legal Proceedings	49
	Item 1A.	Risk Factors	49
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	49
	Item 3.	Defaults Upon Senior Securities	49
	Item 4.	Mine Safety Disclosures	49
	Item 5.	Other Information	49
	Item 6.	Exhibits	50

2

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Certain statements contained in this Form 10-Q and other written or oral statements made by or on behalf of Piedmont Office Realty Trust, Inc. (“Piedmont”) may constitute forward-looking statements within the meaning of the federal securities laws. In addition, Piedmont, or its executive officers on Piedmont’s behalf, may from time to time make forward-looking statements in reports and other documents Piedmont files with the Securities and Exchange Commission or in connection with oral statements made to the press, potential investors, or others. Statements regarding future events and developments and Piedmont’s future performance, as well as management’s expectations, beliefs, plans, estimates, or projections relating to the future, are forward-looking statements within the meaning of these laws. Forward-looking statements include statements preceded by, followed by, or that include the words “may,” “will,” “expect,” “intend,” “anticipate,” “estimate,” “believe,” “continue,” or other similar words. Examples of such statements in this report include descriptions of our real estate, financing, and operating objectives; discussions regarding future dividends and stock repurchases; and discussions regarding the potential impact of economic conditions on our portfolio.

These statements are based on beliefs and assumptions of Piedmont’s management, which in turn are based on currently available information. Important assumptions relating to the forward-looking statements include, among others, assumptions regarding the demand for office space in the sectors in which Piedmont operates, competitive conditions, and general economic conditions. These assumptions could prove inaccurate. The forward-looking statements also involve risks and uncertainties, which could cause actual results to differ materially from those contained in any forward-looking statement. Many of these factors are beyond Piedmont’s ability to control or predict. Such factors include, but are not limited to, the following:

• Market and economic conditions remain challenging and the demand for office space, rental rates and property values may continue to lag the general economic recovery causing our business, results of operations, cash flows, financial condition and access to capital to be adversely affected or otherwise impact performance, including the potential recognition of impairment charges;

• The success of our real estate strategies and investment objectives, including our ability to identify and consummate suitable acquisitions;

• Acquisitions of properties may have unknown risks and other liabilities at the time of acquisition;

• Lease terminations or lease defaults, particularly by one of our large lead tenants;

• The impact of competition on our efforts to renew existing leases or re-let space on terms similar to existing leases;

• Changes in the economies and other conditions of the office market in general and of the specific markets in which we operate, particularly in Chicago, Washington, D.C., and the New York metropolitan area;

• Economic and regulatory changes, including accounting standards, that impact the real estate market generally;

• Additional risks and costs associated with directly managing properties occupied by government tenants;

• Adverse market and economic conditions may continue to adversely affect us and could cause us to recognize impairment charges or otherwise impact our performance;

• Availability of financing and our lending banks’ ability to honor existing line of credit commitments;

• We have significant indebtedness and may not be able to meet our debt service obligations;

• Costs of complying with governmental laws and regulations;

• Uncertainties associated with environmental and other regulatory matters;

• Potential changes in political environment and reduction in federal and/or state funding of our governmental tenants;

• We may be subject to litigation, which could have a material adverse effect on our financial condition;

• Piedmont’s ability to continue to qualify as a REIT under the Internal Revenue Code (the “Code”); and

• Other factors, including the risk factors discussed under Item 1A. of Piedmont’s Annual Report on Form 10-K for the year ended December 31, 2012, and the Risk Factors contained in Piedmont's Registration Statement on Form S-4 filed on June 4, 2013.

Management believes these forward-looking statements are reasonable; however, undue reliance should not be placed on any forward-looking statements, which are based on current expectations. Further, forward-looking statements speak only as of the date they are made, and management undertakes no obligation to update publicly any of them in light of new information or future events.

3

PART I. FINANCIAL STATEMENTS

ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS

The information presented in the accompanying consolidated balance sheets and related consolidated statements of operations, comprehensive income, stockholders’ equity, and cash flows reflects all adjustments that are, in management’s opinion, necessary for a fair and consistent presentation of financial position, results of operations, and cash flows in accordance with U.S. generally accepted accounting principles.

The accompanying financial statements should be read in conjunction with the notes to Piedmont’s financial statements and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in this report on Form 10-Q and with Piedmont’s Annual Report on Form 10-K for the year ended December 31, 2012, as well as the Current Report on Form 8-K containing Exhibit 99.1 filed on June 4, 2013, for the purpose of recasting certain sections of Piedmont's Annual Report on Form 10-K for the year ended December 31, 2012 for dispositions subsequent to December 31, 2012. Piedmont’s results of operations for the nine months endedSeptember 30, 2013 are not necessarily indicative of the operating results expected for the full year.

4

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED BALANCE SHEETS

(in thousands, except for share and per share amounts)

	(Unaudited)
	September 30, 2013			December 31, 2012
Assets:
Real estate assets, at cost:
Land	$	675,281		$	627,351
Buildings and improvements, less accumulated depreciation of $955,480 and $877,644 as of September 30, 2013 and December 31, 2012, respectively	3,049,905			2,891,323
Intangible lease assets, less accumulated amortization of $70,744 and $67,940 as of September 30, 2013 and December 31, 2012, respectively	66,870			54,744
Construction in progress	61,162			20,373
Real estate assets held for sale, net	19,734			18,941
Total real estate assets	3,872,952			3,612,732
Investments in unconsolidated joint ventures	18,668			37,226
Cash and cash equivalents	15,972			12,957
Tenant receivables, net of allowance for doubtful accounts of $306 and $346 as of September 30, 2013 and December 31, 2012, respectively	31,006			25,038
Straight-line rent receivables	135,487			121,506
Due from unconsolidated joint ventures	—			463
Restricted cash and escrows	385			334
Prepaid expenses and other assets	17,610			13,022
Goodwill	180,097			180,097
Interest rate swaps	19,192			1,075
Deferred financing costs, less accumulated amortization of $12,365 and $10,479 as of September 30, 2013 and December 31, 2012, respectively	7,990			6,454
Deferred lease costs, less accumulated amortization of $129,998 and $112,496 as of September 30, 2013 and December 31, 2012, respectively	275,234			243,178
Other assets held for sale, net	1,960			793
Total assets	$	4,576,553		$	4,254,875
Liabilities:
Unsecured debt	$	835,650		$	429,000
Secured debt	987,525			987,525
Accounts payable, accrued expenses, and accrued capital expenditures	159,675			127,263
Deferred income	26,575			21,552
Intangible lease liabilities, less accumulated amortization of $43,322 and $40,931 as of September 30, 2013 and December 31, 2012, respectively	41,435			40,805
Interest rate swaps	5,010			8,235
Total liabilities	2,055,870			1,614,380
Commitments and Contingencies	—			—
Stockholders’ Equity:
Shares-in-trust, 150,000,000 shares authorized; none outstanding as of September 30, 2013 or December 31, 2012	—			—
Preferred stock, no par value, 100,000,000 shares authorized; none outstanding as of September 30, 2013 or December 31, 2012	—			—
Common stock, $.01 par value, 750,000,000 shares authorized; 161,270,766 and 167,556,001 shares issued and outstanding as of September 30, 2013 and December 31, 2012, respectively	1,613			1,676
Additional paid-in capital	3,668,424			3,667,051
Cumulative distributions in excess of earnings	(1,165,794		)	(1,022,681		)
Other comprehensive income/(loss)	14,827			(7,160		)
Piedmont stockholders’ equity	2,519,070			2,638,886
Noncontrolling interest	1,613			1,609
Total stockholders’ equity	2,520,683			2,640,495
Total liabilities and stockholders’ equity	$	4,576,553		$	4,254,875

See accompanying notes

5

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF INCOME

(in thousands, except for share and per share amounts)

	(Unaudited)						(Unaudited)
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2013			2012			2013			2012
Revenues:
Rental income	$	116,810		$	104,948		$	333,855		$	312,007
Tenant reimbursements	27,418			27,132			77,168			80,290
Property management fee revenue	890			520			2,034			1,720
	145,118			132,600			413,057			394,017
Expenses:
Property operating costs	58,767			50,483			164,420			154,568
Depreciation	30,785			27,921			90,688			81,721
Amortization	13,878			15,165			34,244			39,095
General and administrative	5,841			5,508			16,678			15,629
	109,271			99,077			306,030			291,013
Real estate operating income	35,847			33,523			107,027			103,004
Other income (expense):
Interest expense	(19,331		)	(16,247		)	(53,932		)	(48,727		)
Interest and other income/(expense)	(611		)	383			(1,960		)	765
Litigation settlement recovery/(expense)	—			(7,500		)	1,250			(7,500		)
Net recoveries of casualty loss	3,919			—			6,061			—
Equity in income of unconsolidated joint ventures	46			323			604			739
Loss on consolidation	(898		)	—			(898		)	—
	(16,875		)	(23,041		)	(48,875		)	(54,723		)
Income from continuing operations	18,972			10,482			58,152			48,281
Discontinued operations:
Operating income	128			607			1,109			2,914
Impairment loss	—			—			(6,402		)	—
Gain/(loss) on sale of real estate assets	—			(254		)	16,258			27,583
Income from discontinued operations	128			353			10,965			30,497
Net income	19,100			10,835			69,117			78,778
Less: Net income attributable to noncontrolling interest	(4		)	(4		)	(12		)	(12		)
Net income attributable to Piedmont	$	19,096		$	10,831		$	69,105		$	78,766
Per share information – basic and diluted:
Income from continuing operations	$	0.12		$	0.06		$	0.35		$	0.28
Income from discontinued operations	—			—			0.06			0.18
Net income available to common stockholders	$	0.12		$	0.06		$	0.41		$	0.46
Weighted-average common shares outstanding – basic	164,683,173			168,805,589			166,597,577			171,162,281
Weighted-average common shares outstanding – diluted	164,796,275			168,929,039			166,734,464			171,295,098

See accompanying notes.

6

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	(Unaudited)										(Unaudited)
	Three Months Ended										Nine Months Ended
	September 30,										September 30,
	2013					2012					2013			2012
Net income attributable to Piedmont			$	19,096				$	10,831			$	69,105			$	78,766
Other comprehensive income/(loss):
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)	(2,201	)				(2,756	)				19,659			(8,628	)
Plus: Reclassification of previously recorded loss included in net income (See Note 5)	783					762					2,328			2,249
Other comprehensive income/(loss)			(1,418		)			(1,994		)		21,987				(6,379		)
Comprehensive income attributable to Piedmont			$	17,678				$	8,837			$	91,092			$	72,387

See accompanying notes

7

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

FOR THE YEAR ENDED DECEMBER 31, 2012

AND FOR THE NINE MONTHS ENDEDSEPTEMBER 30, 2013 (UNAUDITED)

(in thousands, except per share amounts)

	Common  Stock					Additional Paid-In Capital			Cumulative Distributions in Excess of Earnings			Other Comprehensive Income/(Loss)			Non- controlling Interest			Total Stockholders’ Equity
	Shares		Amount
Balance, December 31, 2011	172,630		$	1,726		$	3,663,662		$	(891,032	)	$	(2,537	)	$	1,609		$	2,773,428
Share repurchases as part of an announced plan	(5,255	)	(52		)	—			(88,685		)	—			—			(88,737		)
Offering costs associated with the issuance of common stock	—		—			567			—			—			—			567
Dividends to common stockholders ($0.80 per share), distributions to noncontrolling interest, and dividends reinvested	—		—			(195		)	(136,168		)	—			(15		)	(136,378		)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	181		2			3,017			—			—			—			3,019
Net income attributable to noncontrolling interest	—		—			—			—			—			15			15
Net income attributable to Piedmont	—		—			—			93,204			—			—			93,204
Other comprehensive loss	—		—			—			—			(4,623		)	—			(4,623		)
Balance, December 31, 2012	167,556		1,676			3,667,051			(1,022,681		)	(7,160		)	1,609			2,640,495
Share repurchases as part of an announced plan	(6,433	)	(64		)	—			(112,287		)	—			—			(112,351		)
Offering costs associated with the issuance of common stock	—		—			(91		)	—			—			—			(91		)
Dividends to common stockholders ($0.60 per share), distributions to noncontrolling interest, and dividends reinvested	—		—			(163		)	(99,931		)	—			(8		)	(100,102		)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	148		1			1,627			—			—			—			1,628
Net income attributable to noncontrolling interest	—		—			—			—			—			12			12
Net income attributable to Piedmont	—		—			—			69,105			—			—			69,105
Other comprehensive income	—		—			—			—			21,987			—			21,987
Balance, September 30, 2013	161,271		$	1,613		$	3,668,424		$	(1,165,794	)	$	14,827		$	1,613		$	2,520,683

See accompanying notes

8

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands) 

	(Unaudited)
	Nine Months Ended
	September 30,
	2013			2012
Cash Flows from Operating Activities:
Net income	$	69,117		$	78,778
Operating distributions received from unconsolidated joint ventures	1,475			1,805
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	91,376			84,100
Amortization of deferred financing costs	1,931			2,056
Settlement of forward starting interest rate swaps	672			—
Other amortization	34,384			38,895
Impairment loss on real estate assets	6,402			—
Stock compensation expense	1,489			1,492
Equity in income of unconsolidated joint ventures	(604		)	(740		)
Gain on sale of real estate assets, net	(16,258		)	(27,583		)
Loss on consolidation	898			—
Changes in assets and liabilities:
Increase in tenant receivables, net	(24,257		)	(15,358		)
Increase in restricted cash and escrows	(51		)	(13,813		)
Increase in prepaid expenses and other assets	(4,539		)	(3,335		)
Increase/(decrease) in accounts payable and accrued expenses	1,291			(483		)
Increase/(decrease) in deferred income	5,022			(3,211		)
Net cash provided by operating activities	168,348			142,603
Cash Flows from Investing Activities:
Acquisition of real estate assets and related intangibles	(250,127		)	(2,500		)
Capitalized expenditures, net of accruals	(112,486		)	(71,936		)
Acquisition of unconsolidated joint ventures, net of cash assumed	(14,242		)	—
Net sales proceeds from wholly-owned properties	49,326			74,845
Investments in unconsolidated joint ventures	(793		)	—
Deferred lease costs paid	(28,349		)	(39,319		)
Net cash used in investing activities	(356,671		)	(38,910		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,447		)	(2,991		)
Proceeds from debt	832,603			365,000
Repayments of debt	(426,000		)	(401,500		)
Costs of issuance of common stock	(91		)	(229		)
Repurchases of common stock as part of announced plan	(111,625		)	(80,130		)
Dividends paid and discount on dividend reinvestments	(100,102		)	(102,770		)
Net cash provided by/(used in) financing activities	191,338			(222,620		)
Net increase/(decrease) in cash and cash equivalents	3,015			(118,927		)
Cash and cash equivalents, beginning of period	12,957			139,690
Cash and cash equivalents, end of period	$	15,972		$	20,763
Supplemental Disclosures of Significant Noncash Investing and Financing Activities:
Change in accrued share repurchases as part of an announced plan	$	726		$	—
Accrued capital expenditures and deferred lease costs	$	38,837		$	11,177
Accrued deferred financing costs	$	—		$	110

See accompanying notes

9

PIEDMONT OFFICE REALTY TRUST, INC.

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

SEPTEMBER 30, 2013

(unaudited)

1.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 June of 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 September 30, 2013, Piedmont owned interests in 77 consolidated office properties, plus two buildings owned through an unconsolidated joint venture. Our 77 consolidated office properties are located in 18 metropolitan areas across the United States. These office properties comprise approximately 21.1 million square feet of primarily Class A commercial office space, and were approximately 86.7% leased as of September 30, 2013.

2.Summary of Significant Accounting Policies

Basis of Presentation

The consolidated financial statements of Piedmont have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”), including the instructions to Form 10-Q and Article 10 of Regulation S-X, and do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. In the opinion of management, the statements for the unaudited interim periods presented include all adjustments, which are of a normal and recurring nature, necessary for a fair presentation of the results for such periods. Results for these interim periods are not necessarily indicative of a full year’s results and 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 nine months endedSeptember 30, 2013 and during the year ended December 31, 2012 (see Note 9), as well as reclassifying other rental income as rental income to be consistent with current period presentation, as further described in "Revenue Recognition" below. None of these reclassifications affect net income attributable to Piedmont as presented in previous periods.

Piedmont’s consolidated financial statements 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. For further information, refer to the financial statements and footnotes included in Piedmont’s Annual Report on Form 10-K for the year ended December 31, 2012, as well as the Current Report on Form 8-K containing Exhibit 99.1 filed on June 4, 2013, for the purpose of recasting certain sections of Piedmont's Annual Report on Form 10-K for the year ended December 31, 2012 for dispositions subsequent to December 31, 2012.

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.

Deferred Lease Costs

Deferred lease costs are comprised of costs and incentives incurred to acquire operating leases, including intangible lease origination costs and direct payroll costs incurred related to negotiating and executing specific leases, and are capitalized and amortized on a straight-line basis over the terms of the related underlying leases. The amortization of deferred lease costs and intangibles is

10

recorded as amortization expense in the accompanying consolidated statements of 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.

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 recognized through impairment charges when identified.

Income Taxes

Piedmont has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (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. Piedmont is subject to certain taxes related to the operations of properties in certain locations, as well as operations conducted by its taxable REIT subsidiary, POH, which have been provided for in the financial statements.

3.Acquisitions

During the nine months endedSeptember 30, 2013, Piedmont acquired the following properties:

Property		Metropolitan Statistical Area	Date of Acquisition	Rentable Square Feet	Percentage Leased as of Acquisition			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	89		%	$	4.3	(2)
5301 Maryland Way	(1)	Nashville, TN	August 12, 2013	201,237	100		%	$	18.5	(2)
4685 Investment Drive	(1)	Detroit, MI	August 12, 2013	77,045	100		%	$	10.0	(2)
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.

⁽²⁾ Purchase price represents the estimated fair value of the respective property which 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 three months ended September 30, 2013.

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4.Debt

On May 9, 2013, Piedmont, through its 100% owned operating partnership, Piedmont OP, issued $350 million in aggregate principal amount of 3.40% Senior Notes which mature on June 1, 2023 (the “Senior Notes”). The Senior Notes were originally offered in a private offering and subsequently exchanged for notes registered under the Securities Act of 1933, as amended. The Senior Notes are fully and unconditionally guaranteed on a senior unsecured basis by Piedmont.

Upon issuance of the Senior Notes, Piedmont OP received proceeds of approximately $348.6 million, reflecting a discount of approximately $1.4 million which is being amortized as interest expense under the effective interest method over the ten-year term of the Senior Notes. In addition, in conjunction with the issuance, Piedmont settled two forward starting rate swaps, consisting of notional amounts of $220 million and $30 million, respectively. The settlement of the swaps resulted in a gain of approximately $0.7 million that is being amortized as an offset to interest expense over the ten-year term of the Senior Notes. See Note 5 for further detail.

During the nine months endedSeptember 30, 2013, Piedmont incurred additional working capital borrowings of $484.0 million and, utilizing the proceeds of the Senior Notes issuance described above as well as other cash on hand, made repayments totaling $426.0 million on its $500 Million Unsecured Line of Credit. Piedmont also made interest payments on all debt facilities, including interest rate swap cash settlements, of approximately $15.5 million and $15.7 million for the three months endedSeptember 30, 2013 and 2012, respectively, and $47.3 million and $47.1 million for the nine months endedSeptember 30, 2013 and 2012, respectively. For the nine months endedSeptember 30, 2013 Piedmont had no capitalized interest.

See Note 7 for a description of Piedmont’s estimated fair value of debt as of September 30, 2013.

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The following table summarizes the terms of Piedmont’s indebtedness outstanding as of September 30, 2013 and December 31, 2012 (in thousands):

Facility	Collateral	Rate(1)			Maturity	Amount Outstanding as of
						September 30, 2013		December 31, 2012
Secured (Fixed)
$200.0 Million Mortgage Note	Aon Center	4.87	%		5/1/2014	$	200,000	$	200,000
$25.0 Million Mortgage Note	Aon Center	5.70	%		5/1/2014	25,000		25,000
$350.0 Million Secured Pooled Facility	Nine Property Collateralized Pool (2)	4.84	%		6/7/2014	350,000		350,000
$105.0 Million Fixed-Rate Loan	US Bancorp Center	5.29	%		5/11/2015	105,000		105,000
$125.0 Million Fixed-Rate Loan	Four Property Collateralized Pool (3)	5.50	%		4/1/2016	125,000		125,000
$42.5 Million Fixed-Rate Loan	Las Colinas Corporate Center I & II	5.70	%		10/11/2016	42,525		42,525
$140.0 Million WDC Mortgage Notes	1201 & 1225 Eye Street	5.76	%		11/1/2017	140,000		140,000
Subtotal/Weighted Average (4)		5.17	%			987,525		987,525
Unsecured (Variable and Fixed)
$300 Million Unsecured Term Loan		LIBOR +  1.45%		(5)	11/22/2016	300,000		300,000
$500 Million Unsecured Line of Credit		1.36	%	(6)	8/19/2016	187,000		129,000
$350 Million Senior Notes		3.40	%	(7)	6/1/2023	348,650		—
Subtotal/Weighted Average (4)		2.71	%			835,650		429,000
Total/ Weighted Average (4)		4.04	%			$	1,823,175	$	1,416,525

⁽¹⁾  All of Piedmont’s outstanding debt as of September 30, 2013 and December 31, 2012 is interest-only debt.

⁽²⁾  Nine property collateralized pool includes: 1200 Crown Colony Drive, Braker Pointe III, 2 Gatehall Drive, One and Two Independence Square, 2120 West End Avenue, 400 Bridgewater Crossing, 200 Bridgewater Crossing, and Fairway Center II.

⁽³⁾  Four property collateralized pool includes 1430 Enclave Parkway, Windy Point I and II, and 1055 East Colorado Boulevard.

⁽⁴⁾  Weighted average is based on contractual balance of outstanding debt and interest rates in the table as of September 30, 2013, except for the $350 Million Senior Notes, which were issued at a discount (see footnote 7 below).

⁽⁵⁾  The $300 Million Unsecured 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%.

⁽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 September 30, 2013) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of September 30, 2013 consisted of 30-day LIBOR draws ranging from 0.18% to 0.19% (subject to the additional spread mentioned above).

⁽⁷⁾  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%.

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5.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 nine months endedSeptember 30, 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.

Additionally, over the course of the twelve months ended September 30, 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 Senior Notes (see Note 4), 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 Senior Notes. 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 126 months.

A detail of Piedmont’s interest rate derivatives outstanding as of September 30, 2013 is as follows:

Interest Rate Derivative	Notional Amount (in millions)		Effective Date	Maturity Date
Interest rate swap	$	125	11/22/2011	11/22/2016
Interest rate swap	75		11/22/2011	11/22/2016
Interest rate swap	50		11/22/2011	11/22/2016
Interest rate swap	50		11/22/2011	11/22/2016
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Total	$	580

Piedmont has elected to present its interest rate derivatives on its consolidated balance sheets on a gross basis as interest rate swap asset and interest rate swap liabilities. A detail of Piedmont’s interest rate derivatives on a gross and net basis as of September 30, 2013 and December 31, 2012, respectively, is as follows (in thousands):

Interest rate swaps classified as:	September 30, 2013			December 31, 2012
Gross derivative assets	$	19,192		$	1,075
Gross derivative liabilities	(5,010		)	(8,235		)
Net derivative asset/(liability)	$	14,182		$	(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 other comprehensive income ("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

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was recorded in the accompanying consolidated statements of income for the three and nine months endedSeptember 30, 2013 and 2012, respectively, is as follows:

	Three Months Ended						Nine Months Ended
Derivative in Cash Flow Hedging Relationships (Interest Rate Swaps) (in thousands)	September 30, 2013			September 30, 2012			September 30, 2013		September 30, 2012
Amount of gain/(loss) recognized in OCI on derivative	$	(2,201	)	$	(2,756	)	$	19,659	$	(8,628	)
Amount of previously recorded loss reclassified from accumulated OCI into interest expense	$	783		$	762		$	2,328	$	2,249

Piedmont estimates that approximately $5.9 million will be reclassified from accumulated other comprehensive loss 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 three and nine months endedSeptember 30, 2013 or 2012.

Additionally, see Note 7 for fair value disclosures of Piedmont's derivative instruments.

Credit-risk-related Contingent Features

Piedmont has agreements with its derivative counterparties that contain a provision whereby if Piedmont defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then Piedmont could also be declared in default on its derivative obligations. If Piedmont were to breach any of the contractual provisions of the derivative contracts, it would be required to settle its obligations under the agreements at their termination value of the fair values plus accrued interest, or approximately $5.1 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.

6.Variable Interest Entities

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 September 30, 2013 is as follows (net carrying amount in millions):

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Entity	Piedmont’s % Ownership of Entity	Related Building	Consolidated/ Unconsolidated	Net Carrying Amount as of September 30, 2013			Net Carrying Amount as of December 31, 2012			Primary Beneficiary Considerations
1201 Eye Street NW Associates, LLC	49.5%	1201 Eye Street	Consolidated	$	(4.5	)	$	(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.
1225 Eye Street NW Associates, LLC	49.5%	1225 Eye Street	Consolidated	$	(0.4	)	$	(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.
Piedmont 500 W. Monroe Fee, LLC	100%	500 W. Monroe	Consolidated	$	228.0		$	194.0		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 Gateway One	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.
Medici Atlanta, LLC	100%	The Medici	Consolidated	$	14.5		$	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	$	22.1		$	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.

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7.Fair Value Measurement of Financial Instruments

Piedmont considers its cash, accounts receivable, restricted cash and escrows, accounts payable and accrued expenses, interest rate swap agreements, and debt to meet the definition of financial instruments. The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of September 30, 2013 and December 31, 2012, respectively (in thousands):

	September 30, 2013					December 31, 2012
Financial Instrument	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy
Assets:
Cash and cash equivalents(1)	$	15,972	$	15,972	Level 1	$	12,957	$	12,957	Level 1
Tenant receivables, net(1)	$	31,006	$	31,006	Level 1	$	25,038	$	25,038	Level 1
Restricted cash and escrows(1)	$	385	$	385	Level 1	$	334	$	334	Level 1
Interest rate swap asset	$	19,192	$	19,192	Level 2	$	1,075	$	1,075	Level 2
Liabilities:
Accounts payable and accrued expenses(1)	$	22,229	$	22,229	Level 1	$	23,113	$	23,113	Level 1
Interest rate swap liability	$	5,010	$	5,010	Level 2	$	8,235	$	8,235	Level 2
Debt	$	1,823,175	$	1,836,413	Level 2	$	1,416,525	$	1,470,002	Level 2

⁽¹⁾  For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to their short-term maturity.

Piedmont's debt was carried at book value as of September 30, 2013 and December 31, 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 5, are classified as “Interest rate swap” assets and liabilities in the accompanying consolidated balance sheets and were carried at fair value as of September 30, 2013 and December 31, 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 September 30, 2013 and December 31, 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.

8.Commitments and Contingencies

Commitments Under Existing Agreements

Certain lease agreements include provisions that, at the option of the tenant, may obligate Piedmont to provide funding for capital improvements. Under its existing lease agreements, Piedmont may be required to fund significant tenant improvements, leasing commissions, and building improvements. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for capital improvements or other financial obligations. Further, Piedmont classifies such tenant and building improvements into two classes: (i) improvements which incrementally enhance the building's

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asset value by expanding its revenue generating capacity (“incremental capital expenditures”) and (ii) improvements which maintain the building's existing asset value and its revenue generating capacity (“non-incremental capital expenditures”). As of September 30, 2013, Piedmont anticipates funding potential non-incremental capital expenditures for tenant improvements of approximately $93.7 million related to its existing lease portfolio over the respective lease terms, the majority of which Piedmont estimates may be required to be funded over the next several years. For most of Piedmont’s leases, the timing of the actual funding of these tenant improvements is largely dependent upon tenant requests for reimbursement. In some cases, these obligations may expire with the leases without further recourse to Piedmont.

Additionally, as of September 30, 2013, commitments for incremental capital expenditures for tenant improvements associated with new leases, primarily at value-add properties, totaled approximately $23.6 million.

Contingencies Related to Tenant Audits/Disputes

Certain lease agreements include provisions that grant tenants the right to engage independent auditors to audit their annual operating expense reconciliations. Such audits may result in the re-interpretation of language in the lease agreements which could result in the refund of previously recognized tenant reimbursement revenues, resulting in financial loss to Piedmont. Piedmont recorded additional expense related to such tenant audits/disputes of approximately $0.5 million and $0.2 million during the three months endedSeptember 30, 2013 and September 30, 2012, respectively, and approximately $0.6 million and $0.2 million for the nine months endedSeptember 30, 2013 and September 30, 2012, respectively.

Letters of Credit

As of September 30, 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)
$	7,696,548	July 2014
$	9,033,164	July 2014
$	382,556	July 2014

⁽¹⁾  These letter of credit agreements automatically renew for consecutive, one-year periods each anniversary, subject to the satisfaction of the credit obligation and certain other limitations.

9.Discontinued Operations

Piedmont has classified the results of operations related to the following properties as discontinued operations (in thousands):

Building(s) Sold	Location	Date of Sale	Gain/(Loss) on Sale			Net Sales Proceeds
Portland Portfolio(1)	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	$	16,267		$	45,574
350 Spectrum Loop(2)	Colorado Springs, Colorado	Held for Sale(2)	N/A			N/A

⁽¹⁾  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.

⁽²⁾  On September 30, 2013, Piedmont entered into a binding agreement to sell the 350 Spectrum Loop building with an expected close in November 2013, and in accordance with GAAP, Piedmont reclassified the building from real estate assets held-for-use to real estate assets held-for-sale on its consolidated balance sheet as of September 30, 2013. As such, Piedmont reclassified the operational results of the property as income from discontinued operations for prior periods to conform with current period presentation.

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Sale of 1111 Durham Avenue building

In accordance with GAAP during the quarter ended March 31, 2013, Piedmont re-classified the 1111 Durham Avenue building from real estate assets held-for-use (at cost) to real estate assets held for sale (at estimated fair value) and recorded an impairment charge of $6.4 million, which represents the difference in carrying value of the asset at the time the asset met the held for sale criteria. The fair value measurement used in the evaluation of this non-financial asset is considered to be a Level 1 valuation within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the asset. After assessing the age of the building (constructed in 1975) and leasing prospects, Piedmont determined that the sales price should appropriately represent the land value of the asset. As a result, Piedmont disposed of the 1111 Durham Avenue building for a gross sale price of approximately $4.0 million, exclusive of closing costs. The transaction closed on March 28, 2013.

Assets Held for Sale

The details comprising assets held for sale, consisting solely of the 350 Spectrum Loop building, are presented below (in thousands):

	September 30, 2013		December 31, 2012
Real estate assets held for sale, net:
Land	$	2,185	$	2,186
Building and improvements, less accumulated depreciation of $6,737 and $6,313 as of September 30, 2013 and December 31, 2012, respectively	16,332		16,755
Construction in progress	1,217		—
Total real estate assets held for sale, net	$	19,734	$	18,941
Other assets held for sale:
Straight-line rent	$	1,018	$	793
Deferred lease costs, less accumulated amortization of $78 and $0 as of September 30, 2013 and December 31, 2012, respectively	942		—
Total other assets held for sale, net	$	1,960	$	793

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Income from Discontinued Operations

The details comprising income from discontinued operations are presented below (in thousands):

	Three Months Ended						Nine Months Ended
	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Revenues:
Rental income	$	516		$	2,388		$	2,693		$	8,403
Tenant reimbursements	91			410			650			1,298
	607			2,798			3,343			9,701
Expenses:
Property operating costs	316			1,262			1,448			3,834
Depreciation	141			732			687			2,379
Amortization	21			159			138			527
General and administrative	—			38			2			47
	478			2,191			2,275			6,787
Other income (expense):
Interest and other income/(expense)	(1		)	—			24			—
Net recoveries of casualty loss	—			—			17			—
	(1		)	—			41			—
Operating income, excluding gain/(loss) on sale	128			607			1,109			2,914
Impairment loss	—			—			(6,402		)	—
Gain/(loss) on sale of real estate assets	—			(254		)	16,258			27,583
Income from discontinued operations	$	128		$	353		$	10,965		$	30,497

10.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 nine months endedSeptember 30, 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 Nine Months Ended September 30, 2013	161,257		$	19.47
Deferred Stock Awards Vested During Nine Months Ended September 30, 2013	(204,295	)	$	18.93
Deferred Stock Awards Forfeited During Nine Months Ended September 30, 2013	(2,862	)	$	18.55
Unvested Deferred Stock Awards as of September 30, 2013	272,993		$	18.64

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The following table provides additional information regarding stock award activity during the three and nine months endedSeptember 30, 2013 and 2012, respectively (in thousands except for per share data):

	Three Months Ended				Nine Months Ended
	September 30, 2013		September 30, 2012		September 30, 2013		September 30, 2012
Weighted-Average Grant Date Fair Value of Shares Granted During the Period	$	—	$	17.10	$	19.47	$	17.48
Total Grant Date Fair Value of Shares Vested During the Period	$	28	$	28	$	3,867	$	5,241
Share-based Liability Awards Paid During the Period(1)	$	—	$	—	$	103	$	798

⁽¹⁾  Amounts reflect the issuance of performance share awards during the period.

A detail of Piedmont’s outstanding employee deferred stock awards as of September 30, 2013 is as follows:

Date of grant	Type of Award	Net Shares Granted (1)	Grant Date Fair Value		Vesting Schedule	Unvested Shares as of September 30, 2013
April 5, 2011	Annual Deferred Stock Award	116,116	$	19.40	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on April 5, 2012, 2013, and 2014, respectively.	37,196
April 5, 2011	Fiscal Year 2011-2013 Performance Share Program	—	$	18.27	Shares awarded, if any, will vest immediately upon determination of award in 2014.	—	(2)
April 4, 2012	Annual Deferred Stock Award	191,786	$	17.53	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 4, 2013, 2014, and 2015, respectively.	116,289
April 4, 2012	Fiscal Year 2012-2014 Performance Share Program	—	$	17.42	Shares awarded, if any, will vest immediately upon determination of award in 2015.	—	(2)
April 2, 2013	Annual Deferred Stock Award	146,679	$	19.47	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 2, 2014, 2015, and 2016, respectively.	119,508
April 2, 2013	Fiscal Year 2013-2015 Performance Share Program	—	$	18.91	Shares awarded, if any, will vest immediately upon determination of award in 2016.	—	(2)
Total						272,993

⁽¹⁾  Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through September 30, 2013.

⁽²⁾  Estimated based on Piedmont's cumulative total stockholder return ("TSR") for the respective performance period through September 30, 2013. As of September 30, 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 three months endedSeptember 30, 2013 and 2012, respectively, Piedmont recognized approximately $0.7 million and $0.9 million of compensation expense related to stock awards, all of which related to the amortization of nonvested shares. During the nine months endedSeptember 30, 2013 and 2012, respectively, Piedmont recognized approximately $3.0 million and $3.1 million of compensation expense related to stock awards, of which approximately $1.8 million and $1.8 million relates to the amortization of nonvested shares, respectively. During the nine months endedSeptember 30, 2013, a total of 147,515 shares were issued to employees, directors, and officers. As of September 30, 2013, approximately $2.5 million of unrecognized compensation

21

cost related to nonvested, annual deferred stock awards remained, which Piedmont will record in its consolidated statements of income over a weighted-average vesting period of approximately one year.

11.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 income for the three and nine months endedSeptember 30, 2013 and 2012, respectively (in thousands):

	Three Months Ended		Nine Months Ended
	September 30, 2013	September 30, 2012	September 30, 2013	September 30, 2012
Weighted-average common shares – basic	164,683	168,806	166,598	171,162
Plus incremental weighted-average shares from time-vested conversions:
Restricted stock awards	113	123	136	133
Weighted-average common shares – diluted	164,796	168,929	166,734	171,295

22

12.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.

23

Condensed Consolidated Balance Sheets
As of September 30, 2013
(in thousands)	Issuer		Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Assets:
Real estate assets, at cost:
Land	$	88,054	$	—		$	587,227		$	—		$	675,281
Buildings and improvements, less accumulated depreciation	492,098		—			2,558,107			(300		)	3,049,905
Intangible lease assets, less accumulated amortization	2,547		—			64,323			—			66,870
Construction in progress	2,546		—			58,616			—			61,162
Real estate assets held for sale, net	19,734		—			—			—			19,734
Total real estate assets	604,979		—			3,268,273			(300		)	3,872,952
Investments in and amounts due from unconsolidated joint ventures	18,668		—			—			—			18,668
Cash and cash equivalents	12,096		146			3,730			—			15,972
Tenant and straight-line rent receivables, net	35,914		—			130,579			—			166,493
Advances to affiliates	5,110,420		1,293,461			(1,086,177		)	(5,317,704		)	—
Investment in subsidiary	—		4,035,964			199			(4,036,163		)	—
Notes receivable	160,000		2,000			23,890			(185,890		)	—
Prepaid expenses, restricted cash, escrows, and other assets	5,671		47			13,218			(941		)	17,995
Goodwill	180,097		—			—			—			180,097
Interest rate swaps	19,192		—			—			—			19,192
Deferred financing costs, net	6,703		—			1,287			—			7,990
Deferred lease costs, net	36,293		—			238,941			—			275,234
Other assets held for sale, net	1,960		—			—			—			1,960
Total assets	$	6,191,993	$	5,331,618		$	2,593,940		$	(9,540,998	)	$	4,576,553
Liabilities:
Secured and unsecured debt	$	859,540	$	—		$	1,149,525		$	(185,890	)	$	1,823,175
Accounts payable, accrued expenses, and accrued capital expenditures	20,937		1,360			138,319			(941		)	159,675
Advances from affiliates	306,636		4,807,113			244,499			(5,358,248		)	—
Deferred income	8,533		—			18,042			—			26,575
Intangible lease liabilities, net	6		—			41,429			—			41,435
Interest rate swaps	5,010		—			—			—			5,010
Total liabilities	1,200,662		4,808,473			1,591,814			(5,545,079		)	2,055,870
Stockholders’ Equity:
Common stock	—		1,613			—			—			1,613
Additional paid-in capital	4,035,964		3,668,424			199			(4,036,163		)	3,668,424
Retained/(cumulative distributions in excess of) earnings	940,540		(3,146,892		)	1,000,314			40,244			(1,165,794		)
Other comprehensive loss	14,827		—			—			—			14,827
Piedmont stockholders’ equity	4,991,331		523,145			1,000,513			(3,995,919		)	2,519,070
Noncontrolling interest	—		—			1,613			—			1,613
Total stockholders’ equity	4,991,331		523,145			1,002,126			(3,995,919		)	2,520,683
Total liabilities and stockholders’ equity	$	6,191,993	$	5,331,618		$	2,593,940		$	(9,540,998	)	$	4,576,553

24

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	$	91,782		$	—		$	535,569		$	—		$	627,351
Buildings and improvements, less accumulated depreciation	511,793			—			2,379,530			—			2,891,323
Intangible lease assets, less accumulated amortization	3,265			—			51,479			—			54,744
Construction in progress	1,056			—			19,317			—			20,373
Real estate assets held for sale, net	18,941			—			—			—			18,941
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			238			(49,652		)	—			12,957
Tenant receivables, net	33,495			—			113,049			—			146,544
Advances to affiliates	4,623,173			1,300,158			(908,506		)	(5,014,825		)	—
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	4,218			15			10,071			(948		)	13,356
Goodwill	180,097			—			—			—			180,097
Interest rate swaps	1,075			—			—			—			1,075
Deferred financing costs, net	4,292			—			2,162			—			6,454
Deferred lease costs, net	31,357			—			211,821			—			243,178
Other assets held for sale, net	793			—			—			—			793
Total assets	$	5,765,397		$	5,371,755		$	2,388,930		$	(9,271,207	)	$	4,254,875
Liabilities:
Secured and unsecured 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			135,940			(5,047,035		)	—
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			1,449,430			(5,234,373		)	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
Retained/(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		$	2,388,930		$	(9,271,207	)	$	4,254,875

25

Condensed Consolidated Statements of Income
For the three months ended September 30, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	20,700		$	—		$	97,492		$	(1,382	)	$	116,810
Tenant reimbursements	4,035			—			23,452			(69		)	27,418
Property management fee revenue	—			—			4,003			(3,113		)	890
	24,735			—			124,947			(4,564		)	145,118
Expenses:
Property operating costs	10,939			—			52,597			(4,769		)	58,767
Depreciation	6,068			—			24,717			—			30,785
Amortization	1,353			—			12,525			—			13,878
General and administrative	5,624			64			6,469			(6,316		)	5,841
	23,984			64			96,308			(11,085		)	109,271
Real estate operating income/(loss)	751			(64		)	28,639			6,521			35,847
Other income (expense):
Interest expense	(6,444		)	—			(16,028		)	3,141			(19,331		)
Interest and other income/(expense)	2,262			42			226			(3,141		)	(611		)
Net casualty (loss)/recoveries	(85		)	—			4,004			—			3,919
Equity in income of unconsolidated joint ventures	46			—			—			—			46
Loss on consolidation	(898		)	—			—			—			(898		)
	(5,119		)	42			(11,798		)	—			(16,875		)
Income/(loss) from continuing operations	(4,368		)	(22		)	16,841			6,521			18,972
Discontinued operations:
Operating income/(loss)	131			—			(3		)	—			128
Income/(loss) from discontinued operations	131			—			(3		)	—			128
Net income/(loss)	(4,237		)	(22		)	16,838			6,521			19,100
Less: Net income attributable to noncontrolling interest	—			—			(4		)	—			(4		)
Net income/(loss) attributable to Piedmont	$	(4,237	)	$	(22	)	$	16,834		$	6,521		$	19,096

26

Condensed Consolidated Statements of Income
For the three months ended September 30, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	18,889		$	—		$	87,448		$	(1,389	)	$	104,948
Tenant reimbursements	4,655			—			22,547			(70		)	27,132
Property management fee revenue	—			—			3,634			(3,114		)	520
	23,544			—			113,629			(4,573		)	132,600
Expenses:
Property operating costs	11,279			—			44,006			(4,802		)	50,483
Depreciation	6,200			—			21,721			—			27,921
Amortization	1,378			—			13,787			—			15,165
General and administrative	4,895			84			6,503			(5,974		)	5,508
	23,752			84			86,017			(10,776		)	99,077
Real estate operating income/(loss)	(208		)	(84		)	27,612			6,203			33,523
Other income (expense):
Interest expense	(3,360		)	—			(16,041		)	3,154			(16,247		)
Interest and other income/(expense)	3,245			—			292			(3,154		)	383
Litigation settlement expense	(7,500		)	—			—			—			(7,500		)
Equity in income of unconsolidated joint ventures	323			—			—			—			323
	(7,292		)	—			(15,749		)	—			(23,041		)
Income/(loss) from continuing operations	(7,500		)	(84		)	11,863			6,203			10,482
Discontinued operations:
Operating income	509			—			98			—			607
Loss on sale of real estate assets	(254		)	—			—			—			(254		)
Income from discontinued operations	255			—			98			—			353
Net income/(loss)	(7,245		)	(84		)	11,961			6,203			10,835
Less: Net income attributable to noncontrolling interest	—			—			(4		)	—			(4		)
Net income/(loss) attributable to Piedmont	$	(7,245	)	$	(84	)	$	11,957		$	6,203		$	10,831

27

Condensed Consolidated Statements of Income
For the nine months ended September 30, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	57,754		$	—		$	279,931		$	(3,830	)	$	333,855
Tenant reimbursements	12,018			—			65,357			(207		)	77,168
Property management fee revenue	—			—			11,392			(9,358		)	2,034
	69,772			—			356,680			(13,395		)	413,057
Expenses:
Property operating costs	31,107			—			147,014			(13,701		)	164,420
Depreciation	18,074			—			72,614			—			90,688
Amortization	3,926			—			30,318			—			34,244
General and administrative	16,024			249			18,896			(18,491		)	16,678
	69,131			249			268,842			(32,192		)	306,030
Real estate operating income/(loss)	641			(249		)	87,838			18,797			107,027
Other income (expense):
Interest expense	(15,478		)	—			(47,879		)	9,425			(53,932		)
Interest and other income/(expense)	7,834			128			(497		)	(9,425		)	(1,960		)
Litigation settlement recovery	1,250			—			—			—			1,250
Net casualty (loss)/recoveries	(239		)	—			6,300			—			6,061
Equity in income of unconsolidated joint ventures	604			—			—			—			604
Loss on consolidation	(898		)	—			—			—			(898		)
	(6,927		)	128			(42,076		)	—			(48,875		)
Income/(loss) from continuing operations	(6,286		)	(121		)	45,762			18,797			58,152
Discontinued operations:
Operating income, excluding impairment loss	503			—			606						1,109
Impairment loss	(6,402		)	—			—			—			(6,402		)
Gain/(loss) on sale of real estate assets	(9		)	—			16,267			—			16,258
Income/(loss) from discontinued operations	(5,908		)	—			16,873			—			10,965
Net income/(loss)	(12,194		)	(121		)	62,635			18,797			69,117
Less: Net income attributable to noncontrolling interest	—			—			(12		)	—			(12		)
Net income/(loss) attributable to Piedmont	$	(12,194	)	$	(121	)	$	62,623		$	18,797		$	69,105

28

Condensed Consolidated Statements of Income
For the nine months ended September 30, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	55,272		$	—		$	260,287		$	(3,552	)	$	312,007
Tenant reimbursements	12,774			—			67,727			(211		)	80,290
Property management fee revenue	—			—			10,705			(8,985		)	1,720
	68,046			—			338,719			(12,748		)	394,017
Expenses:
Property operating costs	31,416			—			136,444			(13,292		)	154,568
Depreciation	17,439			—			64,282			—			81,721
Amortization	3,981			—			35,114			—			39,095
General and administrative	14,930			224			18,057			(17,582		)	15,629
	67,766			224			253,897			(30,874		)	291,013
Real estate operating income/(loss)	280			(224		)	84,822			18,126			103,004
Other income (expense):
Interest expense	(9,120		)	—			(48,965		)	9,358			(48,727		)
Interest and other income/(expense)	9,268			—			855			(9,358		)	765
Litigation settlement expense	(7,500		)	—			—			—			(7,500		)
Equity in income of unconsolidated joint ventures	739			—			—			—			739
	(6,613		)	—			(48,110		)	—			(54,723		)
Income/(loss) from continuing operations	(6,333		)	(224		)	36,712			18,126			48,281
Discontinued operations:
Operating income	2,795			—			119			—			2,914
Gain on sale of real estate assets	27,582			—			1			—			27,583
Income from discontinued operations	30,377			—			120			—			30,497
Net income/(loss)	24,044			(224		)	36,832			18,126			78,778
Less: Net income attributable to noncontrolling interest	—			—			(12		)	—			(12		)
Net income/(loss) attributable to Piedmont	$	24,044		$	(224	)	$	36,820		$	18,126		$	78,766

29

Condensed Consolidated Statements of Cash Flows
For the nine months ended September 30, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net Cash Provided by Operating Activities	$	18,325		$	1,363		$	129,863		$	18,797		$	168,348
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(5,858		)	—			(357,055		)	300			(362,613		)
Intercompany note receivable	—			500			—			(500		)	—
Assets assumed upon acquisition of joint ventures	18,045			—			(32,287		)	—			(14,242		)
Net sales proceeds from wholly-owned properties	3,752			—			45,574			—			49,326
Investments in unconsolidated joint ventures	(793		)	—			—			—			(793		)
Deferred lease costs paid	(10,015		)	—			(18,334		)	—			(28,349		)
Net cash (used in)/provided by investing activities	5,131			500			(362,102		)	(200		)	(356,671		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,447		)	—			—			—			(3,447		)
Proceeds from debt	832,603			—			—			—			832,603
Repayments of debt	(426,000		)	—			—			—			(426,000		)
Intercompany note payable	—			—			(500		)	500			—
Costs of issuance of common stock	—			(91		)	—			—			(91		)
Repurchases of common stock as part of announced plan	—			(111,625		)	—			—			(111,625		)
Distributions to/repayments from affiliates	(476,887		)	209,855			286,129			(19,097		)	—
Dividends paid and discount on dividend reinvestments	—			(100,094		)	(8		)	—			(100,102		)
Net cash provided by/(used in) financing activities	(73,731		)	(1,955		)	285,621			(18,597		)	191,338
Net increase/(decrease) in cash and cash equivalents	(50,275		)	(92		)	53,382			—			3,015
Cash and cash equivalents, beginning of period	62,371			238			(49,652		)	—			12,957
Cash and cash equivalents, end of period	$	12,096		$	146		$	3,730		$	—		$	15,972

30

Condensed Consolidated Statements of Cash Flows
For the nine months ended September 30, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net Cash Provided by Operating Activities	$	748		$	1,527		$	122,202		$	18,126		$	142,603
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(16,558		)	—			(57,878		)	—			(74,436		)
Intercompany note receivable	(3,100		)	—			—			3,100			—
Net sales proceeds from wholly-owned properties	74,845			—			—			—			74,845
Deferred lease costs paid	(2,837		)	—			(36,482		)	—			(39,319		)
Net cash provided by/(used in) investing activities	52,350			—			(94,360		)	3,100			(38,910		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(2,991		)	—			—			—			(2,991		)
Proceeds from debt	365,000			—			—			—			365,000
Repayments of debt	(216,500		)	—			(185,000		)	—			(401,500		)
Intercompany note payable	—			—			3,100			(3,100		)	—
Costs of issuance of common stock	—			(229		)	—			—			(229		)
Repurchases of common stock as part of announced plan	—			(80,130		)	—			—			(80,130		)
Distributions to/repayments from affiliates	(305,743		)	181,605			142,264			(18,126		)	—
Dividends paid and discount on dividend reinvestments	—			(102,762		)	(8		)	—			(102,770		)
Net cash used in financing activities	(160,234		)	(1,516		)	(39,644		)	(21,226		)	(222,620		)
Net (decrease)/increase in cash and cash equivalents	(107,136		)	11			(11,802		)	—			(118,927		)
Cash and cash equivalents, beginning of period	166,920			139			(27,369		)	—			139,690
Cash and cash equivalents, end of period	$	59,784		$	150		$	(39,171	)	$	—		$	20,763

31

13.Other Subsequent Events

Fourth Quarter Dividend Declaration

On October 30, 2013, the board of directors of Piedmont declared dividends for the fourth quarter of 2013 in the amount of $0.20 per common share outstanding to stockholders of record as of the close of business on November 29, 2013. Such dividends are to be paid on December 20, 2013.

Amendment and Restatement of Stock Repurchase Plan

Our current stock repurchase plan expires in November of 2013. On October 30, 2013, our board of directors amended and restated the plan to authorize $150 million in stock repurchases over the next two years. 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.

32

ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following discussion and analysis should be read in conjunction with the accompanying consolidated financial statements and notes thereto of Piedmont Office Realty Trust, Inc. (“Piedmont”). See also “Cautionary Note Regarding Forward-Looking Statements” preceding Part I, as well as the notes to our consolidated financial statements and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the year ended December 31, 2012, as well as the Current Report on Form 8-K containing Exhibit 99.1 filed on June 4, 2013, for the purpose of recasting certain sections of Piedmont's Annual Report on Form 10-K for the year ended December 31, 2012 for dispositions subsequent to December 31, 2012.

Liquidity and Capital Resources

We intend to use cash flows generated from the operation of our properties, proceeds from our $500 Million Unsecured Line of Credit, and proceeds from selective property dispositions, as our primary sources of immediate liquidity. As of the time of this filing, we had approximately $272.1 million in capacity under the line of credit facility available for future borrowing (approximately $13.9 million of capacity is reserved as security for outstanding letters of credit required by various third parties). Depending on the timing and volume of property acquisition and disposition activities and debt maturities, we may also issue additional equity or debt securities from time to time. In addition, we may also seek additional borrowings from third-party lenders as additional sources of capital. The availability and attractiveness of terms for these additional sources of capital is highly dependent on market conditions.

We estimate that our most consistent use of capital will be to fund capital expenditures for our existing portfolio of properties. These expenditures include two types of specifically identified building improvement projects: (i) general repair and maintenance projects that we as the owner may choose to perform at our discretion at any of our various properties and (ii) tenant improvement allowances and leasing commissions that we have committed to as part of executed leases with our tenants. Due to the high lease rollover that we have experienced over the last several years, the majority of our expected capital expenditures relate to leasing commissions and tenant improvement allowances as we complete tenant build-outs in preparation for the commencement of executed leases. During the year ended December 31, 2012 and the nine months ended September 30, 2013, we incurred obligations averaging approximately $5.39 and $3.47 per square foot per year of lease term, respectively, for such capital expenditures. As of September 30, 2013, unrecorded contractual obligations for non-incremental tenant improvements related to our existing lease portfolio totaled $93.7 million. The timing of the funding of these commitments is largely dependent upon tenant requests for reimbursement; however, we anticipate that the majority of this amount may be requested over the next 12 - 24 months as certain significant leases commence. In some instances, these obligations may expire with the respective lease, without further recourse to us. Additionally, commitments for incremental capital expenditures for tenant improvements associated with new leases, primarily at value-add properties, total approximately $23.6 million.

We also anticipate incurring market-based concession packages, typically consisting of the tenant allowances described above and/or rent abatement periods, and paying broker commissions in conjunction with the commencement of recently executed, or soon to be executed, leases. Further, we anticipate continuing to grant such concession packages as we negotiate future leases. Given our average lease size of between 30,000 and 35,000 square feet, some of the concession packages that we grant can result in significant capital outlays. In particular, there are currently five blocks of space in excess of 200,000 square feet in our Washington, D.C. and Chicago portfolio that are subject to re-leasing efforts, and we may grant significant concession packages to secure new, or renew existing, tenants for those spaces. Both the timing and magnitude of any such concessions have yet to be determined and are highly dependent on competitive market conditions at the time of lease negotiations.

Subject to the identification and availability of attractive investment opportunities and our ability to consummate additional acquisitions on satisfactory terms, acquiring new assets compatible with our investment strategy could also be a significant use of capital. In March 2013, we acquired two properties, Arlington Gateway in the Washington, D.C. market and 5 & 15 Wayside Road in the Boston, Massachusetts market. These purchases were initially funded using our $500 Million Unsecured Line of Credit and subsequently refinanced with long-term debt through our Senior Notes issuance in May 2013. Additionally, we purchased the remaining partnership interests in three properties previously held through joint ventures, using available capacity under our $500 Million Unsecured Line of Credit, in order to maximize stockholder value by gaining sole control of the leasing and exit strategy for these assets.

Additionally, during the nine months ended September 30, 2013, we have used $111.6 million to repurchase shares of our common stock on the open market pursuant to our publicly announced stock repurchase plan. We have used the plan to repurchase our common stock when we believe that shares are trading at a meaningful discount to our estimate of the fair value of our assets. The current plan was set to expire in November of 2013. On October 30, 2013, our board of directors amended and restated the plan

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to authorize $150 million in stock repurchases over the next two years. Consequently, dependent upon our prevailing stock price, we anticipate that stock repurchases may continue to be a use of capital over the next few years.

Finally, we expect to use capital to repay debt when obligations become due. We currently have no debt maturities scheduled for the remainder of 2013; however, we have $575 million of secured debt maturing in the first six months of 2014. Subject to our assessment of market conditions, we currently anticipate refinancing these amounts with unsecured debt. In anticipation of incurring replacement debt and considering the historically low interest rate environment, we have entered into several forward starting interest rate swaps with a total notional value of $280 million to partially protect us against rising interest rates by locking a portion of the interest rate on future unsecured debt with a 10-year maturity. Again, subject to our assessment of market conditions, we may enter into additional similar swaps in the future.

The amount and form of payment (cash or stock issuance) of future dividends to be paid to our stockholders will continue to be

largely dependent upon (i) the amount of cash generated from our operating activities; (ii) our expectations of future cash flows; (iii) our determination of near-term cash needs for debt repayments and selective acquisitions of new properties; (iv) the timing of significant expenditures for tenant improvements and general property capital improvements; (v) long-term payout ratios for comparable companies; (vi) our ability to continue to access additional sources of capital, including potential sales of our properties; and (vii) the amount required to be distributed to maintain our status as a REIT. Given the fluctuating nature of cash flows and expenditures, we may periodically borrow funds on a short-term basis to cover timing differences in cash receipts and cash disbursements.

Results of Operations

Overview

Our income from continuing operations increased from $0.06 per share for the three months ended September 30, 2012 to $0.12 per share for the three months endedSeptember 30, 2013. The current quarter includes $3.9 million, or approximately $0.02 per diluted share, in insurance reimbursements related to casualty losses incurred in prior periods, whereas the third quarter of the prior year included $7.5 million, or approximately $0.05 per diluted share, of litigation settlement expense. In addition, the current quarter reflects increased interest expense associated with higher outstanding debt balances during the current quarter primarily as a result of property acquisitions made by the Company earlier this year.

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Comparison of the three months endedSeptember 30, 2013 versus the three months endedSeptember 30, 2012

The following table sets forth selected data from our consolidated statements of income for the three months endedSeptember 30, 2013 and 2012, respectively, as well as each balance as a percentage of total revenues for the same periods presented (dollars in millions):

	September 30, 2013			%		September 30, 2012			%		$ Increase (Decrease)
Revenue:
Rental income	$	116.8				$	105.0				$	11.8
Tenant reimbursements	27.4					27.1					0.3
Property management fee revenue	0.9					0.5					0.4
Total revenues	145.1			100	%	132.6			100	%	12.5
Expense:
Property operating costs	58.8			40	%	50.5			38	%	8.3
Depreciation	30.8			21	%	27.9			21	%	2.9
Amortization	13.9			10	%	15.2			12	%	(1.3		)
General and administrative	5.8			4	%	5.5			4	%	0.3
Real estate operating income	35.8			25	%	33.5			25	%	2.3
Other income (expense):
Interest expense	(19.3		)	(13	)%	(16.2		)	(12	)%	(3.1		)
Interest and other income (expense)	(0.6		)	(1	)%	0.4			—	%	(1.0		)
Litigation settlement expense	—			—	%	(7.5		)	(5	)%	7.5
Net recoveries of casualty loss	3.9			3	%	—			—	%	3.9
Equity in income of unconsolidated joint ventures	0.1			—	%	0.3			—	%	(0.2		)
Loss on consolidation	(0.9		)	(1	)%	—			—	%	(0.9		)
Income from continuing operations	$	19.0		13	%	$	10.5		8	%	$	8.5
Income from discontinued operations	$	0.1				$	0.4				$	(0.3	)

Continuing Operations

Revenue

Rental income increased from approximately $105.0 million for the three months endedSeptember 30, 2012 to approximately $116.8 million for the three months endedSeptember 30, 2013 primarily due to approximately $8.5 million of additional revenue attributable to properties acquired during the current year as well as the commencement of several significant leases over the last twelve months, partially offset by the expiration of a 330,000 square foot lease at our One Independence Square building in Washington, D. C. during March 2013.

Tenant reimbursements increased from approximately $27.1 million for the three months endedSeptember 30, 2012 to approximately $27.4 million for the three months endedSeptember 30, 2013. Although we recognized a $1.1 million reduction in tenant reimbursements as a result of operating expense and tax abatements granted on a large lease renewal at the 500 W. Monroe building in Chicago, Illinois, this reduction was offset by higher property tax expense recoveries and utility expense reimbursements at certain of our properties as well as approximately $0.5 million of additional tenant reimbursements associated with properties acquired during the current year.

Property management fee revenue increased approximately $0.4 million for the three months endedSeptember 30, 2013 compared to the same period in the prior year primarily due to the buyer retaining our property management services subsequent to the sale of our 1200 Enclave Parkway building in Houston, Texas in May 2013.

Expense

Property operating costs increased approximately $8.3 million for the three months endedSeptember 30, 2013 compared to the same period in the prior year primarily due to an increase in recoverable property tax expense of approximately $4.4 million, as well as

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additional expense attributable to properties acquired and increased occupancy at several buildings, during the current period.

Depreciation expense increased approximately $2.9 million for the three months endedSeptember 30, 2013 compared to the same period in the prior year. The variance is largely attributable to depreciation on additional tenant and building improvements placed in service subsequent to the prior period which contributed approximately $1.9 million of the increase. The remainder of the increase is due to additional depreciation recognized on new properties acquired during the current year.

Amortization expense decreased approximately $1.3 million for the three months endedSeptember 30, 2013 compared to the same period in the prior year. The variance is primarily attributable to the acceleration of amortization expense on certain lease intangible assets related to a lease termination due to a tenant bankruptcy at our 500 W. Monroe building in the prior period of approximately $3.8 million. This variance was largely offset by the acceleration of amortization related to lease modifications/terminations in the current period of approximately $2.4 million, primarily at our 5 & 15 Wayside Road building.

General and administrative expenses increased approximately $0.3 million for the three months endedSeptember 30, 2013 compared to the same period in the prior year. The increase in expenses is primarily attributable to lower insurance reimbursements of legal expenses in the current period related to litigation settled in October 2012.

Other Income (Expense)

Interest expense increased approximately $3.1 million for the three months endedSeptember 30, 2013 compared to the same period in the prior year. The increase is attributable to higher outstanding, long-term debt balances during the current quarter primarily as a result of property acquisitions during the first quarter of 2013.

Interest and other income/(expense) decreased approximately $1.0 million for the three months endedSeptember 30, 2013 compared to the same period in the prior year. Of the variance, $0.4 million is attributable to the decrease in interest income associated with the repayment of a note receivable in October 2012. The remaining variance is attributable to higher costs related to unconsummated capital markets transactions in the current period.

During the prior period, we incurred $7.5 million of litigation settlement expense related to settlement agreements of two class action lawsuits.

The approximate $3.9 million net casualty gain recognized during the current period is attributable to insurance recoveries related to damages incurred during the fourth quarter of 2012 at certain of our assets in the New York/New Jersey markets as a result of Hurricane Sandy. We anticipate receiving additional insurance recoveries related to these damages in future periods.

During the three months endedSeptember 30, 2013, we purchased all of the remaining interests in three office properties previously held through two unconsolidated joint ventures for $14.7 million in cash. The estimated fair value of the respective properties were 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 three months ended September 30, 2013. The acquisition also resulted in a decrease in equity in income of unconsolidated joint ventures as compared to the prior period, as the results of operations of these properties are now consolidated on the same basis as Piedmont's other wholly-owned properties.

Discontinued Operations

The operations of the Deschutes building, the Rhein building, the Rogue building, and the Willamette building, and 18.19 acres of adjoining, undeveloped land in Beaverton, Oregon (collectively the "Portland Portfolio"), the 26200 Enterprise Way building in Lake Forest, California, the 110 and 112 Hidden Lake Circle buildings in Duncan, South Carolina, the 1111 Durham Avenue building in South Plainfield, New Jersey, the 1200 Enclave Parkway building and the 350 Spectrum Loop building (currently held for sale) in Colorado Springs, Colorado are classified as discontinued operations for all periods presented. Income from discontinued operations decreased approximately $0.3 million for the three months endedSeptember 30, 2013 compared to the same period in the prior year. We do not expect that income from discontinued operations will be comparable to future periods, as such income is subject to the occurrence and timing of future property dispositions.

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Comparison of the nine months endedSeptember 30, 2013 versus the nine months endedSeptember 30, 2012

The following table sets forth selected data from our consolidated statements of income for the nine months endedSeptember 30, 2013 and 2012, respectively, as well as each balance as a percentage of total revenues for the same periods presented (dollars in millions):

	September 30, 2013			%		September 30, 2012			%		$ Increase (Decrease)
Revenue:
Rental income	$	333.9				$	312.0				$	21.9
Tenant reimbursements	77.2					80.3					(3.1		)
Property management fee revenue	2.0					1.7					0.3
Total revenues	413.1			100	%	394.0			100	%	19.1
Expense:
Property operating costs	164.4			40	%	154.6			39	%	9.8
Depreciation	90.7			22	%	81.7			21	%	9.0
Amortization	34.3			8	%	39.1			10	%	(4.8		)
General and administrative	16.7			4	%	15.6			4	%	1.1
Real estate operating income	107.0			26	%	103.0			26	%	4.0
Other income (expense):
Interest expense	(53.9		)	(13	)%	(48.7		)	(12	)%	(5.2		)
Interest and other income/(expense)	(2.0		)	—	%	0.8			—	%	(2.8		)
Litigation settlement recovery/(expense)	1.3			—	%	(7.5		)	(2	)%	8.8
Net recoveries of casualty loss	6.1			1	%	—			—	%	6.1
Equity in income of unconsolidated joint ventures	0.6			—	%	0.7			—	%	(0.1		)
Loss on consolidation	(0.9		)	—	%	—			—	%	(0.9		)
Income from continuing operations	$	58.2		14	%	$	48.3		12	%	$	9.9
Income from discontinued operations	$	11.0				$	30.5				$	(19.5	)

Continuing Operations

Revenue

Rental income increased from approximately $312.0 million for the nine months endedSeptember 30, 2012 to approximately $333.9 million for the nine months endedSeptember 30, 2013 primarily due to approximately $15.4 million of additional revenue attributable to properties acquired during the current year, as well as the commencement of several significant leases over the last twelve months, offset by the expiration of a 330,000 square foot lease at our One Independence Square building during March 2013.

Tenant reimbursements decreased from approximately $80.3 million for the nine months endedSeptember 30, 2012 to approximately $77.2 million for the nine months endedSeptember 30, 2013. The variance is mainly attributable to an approximate $4.2 million reduction in tenant reimbursements as a result of operating expense and tax abatements granted on a large lease renewal at the 500 W. Monroe building and an approximate $1.7 million reduction in tenant reimbursements at the One Independence Square building due to the lease expiration discussed above. These decreases were partially offset by an increase in tenant reimbursements at our 60 Broad Street building and our US Bancorp Center building in Minneapolis, Minnesota primarily driven by higher recoverable property tax expense in the current period.

Property management fee revenue increased approximately $0.3 million for the nine months endedSeptember 30, 2013 compared to the same period in the prior year primarily due to the buyer retaining our property management services subsequent to the sale of our 1200 Enclave Parkway building in May 2013.

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Expense

Property operating costs increased approximately $9.8 million for the nine months endedSeptember 30, 2013 compared to the same period in the prior year. Properties acquired during the current period contributed approximately $4.7 million of additional operating costs and higher recoverable property tax expense at our existing properties contributed an additional $4.7 of operating costs.

Depreciation expense increased approximately $9.0 million for the nine months endedSeptember 30, 2013 compared to the same period in the prior year. The variance is largely attributable to depreciation on additional tenant and building improvements placed in service subsequent to January 1, 2012 which contributed approximately $6.5 million of the increase. The remainder of the increase is due to new properties acquired during the current period.

Amortization expense decreased approximately $4.8 million for the nine months endedSeptember 30, 2013 compared to the same period in the prior year. The variance is primarily attributable to reduced amortization expense as a result of lease intangible assets becoming fully amortized at certain of our existing properties subsequent to January 1, 2012, as well as higher accelerated amortization expense as a result of lease terminations during the prior period. However, these decreases were partially offset by approximately $7.0 million of additional amortization expense related to property acquisitions during the current year.

General and administrative expenses increased approximately $1.1 million for the nine months endedSeptember 30, 2013 compared to the same period in the prior year primarily due to lower insurance reimbursements of legal expenses in the current period related to litigation settled in October 2012, as well as higher personnel and benefits costs in the current period.

Other Income (Expense)

Interest expense increased approximately $5.2 million for the nine months endedSeptember 30, 2013 compared to the same period in the prior year. The increase is attributable to higher outstanding debt balances during the current period primarily as a result of property acquisitions during the first quarter of 2013.

Interest and other income/(expense) decreased approximately $2.8 million for the nine months endedSeptember 30, 2013 compared to the same period in the prior year. The decrease reflects approximately $1.3 million of costs associated with the acquisitions of the Arlington Gateway building and the 5 & 15 Wayside Road building during the current period, as well as a decrease in interest income associated with the repayment of a note receivable in October 2012. The remaining variance is attributable to higher costs related to unconsummated capital markets transactions in the current period.

During the nine months endedSeptember 30, 2013, we recognized approximately $1.3 million in insurance recoveries associated with the $7.5 million of litigation settlement expense we recorded in the prior period related to settlement agreements of two class action lawsuits. We expect to receive additional insurance recoveries related to the settlements in future periods.

The approximate $6.1 million net casualty gain we recognized during the current period is due to insurance recoveries received related to damages incurred at certain of our assets in the New York/New Jersey markets during the fourth quarter of 2012 as a result of Hurricane Sandy. We anticipate receiving additional insurance recoveries related to these damages in future periods.

During the nine months endedSeptember 30, 2013, we purchased all of the remaining interests in three office properties previously held through two unconsolidated joint ventures for $14.7 million in cash. The estimated fair value of the respective properties were 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 three months ended September 30, 2013. The acquisition also resulted in a decrease in equity in income of unconsolidated joint ventures as compared to the prior period, as the results of operations of these properties are now consolidated on the same basis as Piedmont's other wholly-owned properties.

Discontinued Operations

The operations of the Portland Portfolio, the 26200 Enterprise Way building, the 110 and 112 Hidden Lake Circle buildings, the 1111 Durham Avenue building, the1200 Enclave Parkway building, and the 350 Spectrum Loop building are classified as discontinued operations for all periods presented. Income from discontinued operations decreased approximately $19.5 million for the nine months endedSeptember 30, 2013 compared to the same period in the prior year. The decrease is primarily due to the gain realized on the sale of the Portland Portfolio and the 26200 Enterprise Way building in the prior period of approximately $17.8 million and $10.0

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million, respectively. Although we recorded a $16.3 million gain on the sale of the 1200 Enclave Parkway building in the current period, we also recorded an impairment charge of approximately $6.4 million during the nine months endedSeptember 30, 2013 to reflect the difference in carrying value of the 1111 Durham Avenue building at the time the asset met the held for sale criteria and its estimated fair value. We do not expect that income from discontinued operations will be comparable to future periods, as such income is subject to the timing and existence of future property dispositions.

Funds From Operations (“FFO”), Core FFO, and Adjusted Funds from Operations (“AFFO”)

Net income calculated in accordance with GAAP is the starting point for calculating FFO, Core FFO, and AFFO. FFO, Core FFO, and AFFO are non-GAAP financial measures and should not be viewed as an alternative measurement of our operating performance to net income. Management believes that accounting for real estate assets in accordance with GAAP implicitly assumes that the value of real estate assets diminishes predictably over time. Since real estate values have historically risen or fallen with market conditions, many industry investors and analysts have considered the presentation of operating results for real estate companies that use historical cost accounting to be insufficient by themselves. As a result, we believe that the use of FFO, Core FFO, and AFFO, together with the required GAAP presentation, provides a more complete understanding of our performance relative to our competitors and a more informed and appropriate basis on which to make decisions involving operating, financing, and investing activities.

We calculate FFO in accordance with the current NAREIT definition as follows: Net income (computed in accordance with GAAP), excluding gains or losses from sales of property and impairment charges (including our proportionate share of any impairment charges and/or gains or losses from sales of property related to investments in unconsolidated joint ventures), plus depreciation and amortization on real estate assets (including our proportionate share of depreciation and amortization related to investments in unconsolidated joint ventures), excluding gains or losses on consolidation. Other REITs may not define FFO in accordance with the National Association of Real Estate Investment Trusts ("NAREIT") definition, or may interpret the current NAREIT definition differently than we do; therefore, our computation of FFO may not be comparable to such other REITs.

We calculate Core FFO as FFO (calculated as set forth above) exclusive of the net effects of acquisition costs and significant, non-recurring items.

We calculate AFFO as Core FFO (calculated as set forth above) exclusive of the net effects of: (i) amortization associated with deferred financing costs; (ii) depreciation of non real estate assets; (iii) straight-line lease revenue/expense; (iv) amortization of above and below-market lease intangibles; (v) stock-based and other non-cash compensation expense; (vi) amortization of discount on Senior Notes and interest rate swap settlements; (vii) acquisition costs, and (viii) non-incremental capital expenditures (as defined below). Our proportionate share of such adjustments related to investments in unconsolidated joint ventures are also included when calculating AFFO.

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Reconciliations of net income to FFO, Core FFO, and AFFO are presented below (in thousands except per share amounts):

	Three Months Ended												Nine Months Ended
	September 30, 2013			Per Share (1)			September 30, 2012			Per Share(1)			September 30, 2013			Per Share(1)			September 30, 2012			Per Share(1)
Net income attributable to Piedmont	$	19,096		$	0.12		$	10,831		$	0.06		$	69,105		$	0.41		$	78,766		$	0.46
Depreciation of real estate assets(2)	31,050			0.19			28,763			0.18			91,905			0.55			84,605			0.50
Amortization of lease-related costs(2)	13,939			0.08			15,366			0.09			34,509			0.21			39,744			0.23
Impairment loss	—			—			—			—			6,402			0.04			—			—
Loss/(gain) on sale - wholly-owned properties	—			—			254			—			(16,258		)	(0.10		)	(27,583		)	(0.16		)
Loss on consolidation	898			—			—			—			898			0.01			—			—
Funds From Operations	$	64,983		$	0.39		$	55,214		$	0.33		$	186,561		$	1.12		$	175,532		$	1.03
Adjustment:
Acquisition costs	60			—			7			—			1,374			0.01			88			—
Litigation settlement expense/(recovery)	—			—			7,500			0.04			(1,250		)	(0.01		)	7,500			0.04
Net recoveries of casualty loss	(3,919		)	(0.02		)	—			—			(6,078		)	(0.04		)	—			—
Core Funds From Operations	$	61,124		$	0.37		$	62,721		$	0.37		$	180,607		$	1.08		$	183,120		$	1.07
Adjustments:
Deferred financing cost amortization	674			—			663			—			1,911			0.01			2,056			0.01
Amortization of discount on Senior Notes and swap settlements	13			—			—			—			20			—			—			—
Depreciation of non real estate assets	97			—			196			—			300			—			397			—
Straight-line effects of lease revenue (2)	(5,076		)	(0.03		)	(4,193		)	(0.02		)	(14,655		)	(0.08		)	(11,236		)	(0.06		)
Stock-based and other non-cash compensation	719			0.01			869			0.01			1,489			0.01			1,492			0.01
Net effect of amortization of below-market in-place lease intangibles (2)	(1,757		)	(0.01		)	(1,315		)	(0.01		)	(4,067		)	(0.02		)	(4,631		)	(0.03		)
Acquisition costs	(60		)	—			(7		)	—			(1,374		)	(0.01		)	(88		)	—
Non-incremental capital expenditures (3)	(21,705		)	(0.13		)	(38,583		)	(0.23		)	(59,992		)	(0.36		)	(64,430		)	(0.38		)
Adjusted Funds From Operations	$	34,029		$	0.21		$	20,351		$	0.12		$	104,239		$	0.63		$	106,680		$	0.62
Weighted-average shares outstanding – diluted	164,796						168,929						166,734						171,295

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⁽¹⁾  Based on weighted average shares outstanding – diluted.

⁽²⁾  Includes amounts for wholly-owned properties, as well as such amounts for our proportionate ownership in unconsolidated joint ventures.

⁽³⁾  Piedmont defines non-incremental capital expenditures as capital expenditures of a recurring nature related to tenant improvements, leasing commissions, and building capital that do not incrementally enhance the underlying assets' income generating capacity. Tenant improvements, leasing commissions, building capital and deferred lease incentives incurred to lease space that was vacant at acquisition, leasing costs for spaces vacant for greater than one year, leasing costs for spaces at newly acquired properties for which in-place leases expire shortly after acquisition, improvements associated with the expansion of a building, and renovations that either change the underlying classification from a Class B to a Class A property or enhance the marketability of a building are excluded from this measure.

Property and Same Store Net Operating Income (Cash Basis)

Property Net Operating Income on a cash basis ("Property NOI") is a non-GAAP measure which we use to assess our property-level operating results. It is calculated as real estate operating income with the add-back of corporate general and administrative expense, depreciation and amortization, impairment losses, and the deduction of income associated with property management performed by Piedmont for other organizations. We present this measure on a cash basis, which eliminates the effects of straight lined rents and fair value lease revenue. We use this measure as a proxy for the cash generated by our real estate properties. Same Store Net Operating Income on a cash basis ("SSNOI") is another non-GAAP measure very similar to Property NOI, however, SSNOI only reflects Property NOI attributable to the properties owned or placed in service during the entire span of the current and prior year reporting periods. SSNOI excludes amounts attributable to unconsolidated joint venture assets. We believe SSNOI is an important measure because it allows us to compare the cash flows generated by our same real estate properties from one period to another. Other REITs may calculate SSNOI differently and our calculation should not be compared to that of other REITs.

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The following table sets forth our Property NOI and SSNOI with a reconciliation to net income attributable to Piedmont (GAAP basis) for the three and nine months endedSeptember 30, 2013 and 2012, respectively (in thousands):

	Three Months Ended						Nine Months Ended
	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Net income attributable to Piedmont (GAAP basis)	$	19,096		$	10,831		$	69,105		$	78,766
Net income attributable to noncontrolling interest	4			4			12			12
Interest expense	19,331			16,247			53,932			48,727
Depreciation (1)	31,147			28,959			92,204			85,002
Amortization (1)	13,939			15,366			34,509			39,744
Acquisition costs	60			7			1,374			88
Impairment loss (1)	—			—			6,402			—
Litigation settlement expense/(recovery)	—			7,500			(1,250		)	7,500
Net recoveries of casualty loss(1)	(3,919		)	—			(6,078		)	—
Loss/(gain) on sale of properties (1)	—			254			(16,258		)	(27,583		)
Loss on consolidation	898			—			898			—
General & administrative expenses(1)	5,921			5,576			16,940			15,761
Management fee revenue	(890		)	(520		)	(2,034		)	(1,720		)
Interest and other expense/(income)(1)	550			(390		)	561			(873		)
Straight line rent adjustment(1)	(5,076		)	(4,193		)	(14,655		)	(11,236		)
Net effect of amortization of below-market in-place lease intangibles(1)	(1,757		)	(1,315		)	(4,067		)	(4,631		)
Property NOI (cash basis)	$	79,304		$	78,326		$	231,595		$	229,557
Net operating loss/(income) from:
Acquisitions(2)	(6,155		)	7			(10,672		)	7
Dispositions(3)	2			(319		)	(49		)	(2,487		)
Unconsolidated joint ventures	(376		)	(735		)	(1,717		)	(1,923		)
Same Store NOI (cash basis)	$	72,775		$	77,279		$	219,157		$	225,154
Change period over period in Same Store NOI (cash basis)	(5.8		)%	N/A			(2.7		)%	N/A

⁽¹⁾  Includes amounts attributable to consolidated properties, including discontinued operations, and our proportionate share of amounts attributable to unconsolidated joint ventures.

⁽²⁾  Acquisitions consist of the Gavitello Land in Atlanta, Georgia, purchased on June 28, 2012; Glenridge Highlands III Land in Atlanta, Georgia purchased on October 15, 2012; Arlington Gateway in Arlington, Virginia, purchased on March 4, 2013; 5 & 15 Wayside Road in Burlington, Massachusetts, purchased on March 22, 2013, 2020 W. 89th Street in Leawood, Kansas, purchased on August 12, 2013, 5301 Maryland Way in Brentwood, Tennessee, purchased on August 12, 2013, and 4685 Investment Drive in Troy, Michigan, purchased on August 12, 2013.

⁽³⁾  Dispositions consist of the Deschutes, Rhein, Rogue, and Willamette buildings and Portland Land Parcels in Beaverton, Oregon, sold on March 19, 2012; 26200 Enterprise Way in Lake Forest, California, sold on May 31, 2012; 110 and 112 Hidden Lake Circle in Duncan, South Carolina, sold on September 21, 2012; 1111 Durham Avenue in South Plainfield, New Jersey, sold on March 28, 2013; 1200 Enclave Parkway in Houston, Texas, sold on May 1, 2013.

Overview

Our portfolio is a national portfolio located in approximately 18 different geographic markets, and we typically lease to large corporate or governmental tenants. As a result, rent roll ups and roll downs which we experience as a result of re-leasing can fluctuate widely between markets and between tenants within a given market. Over the last three years of slow economic growth we have been working through a period of high lease expirations, and although we have signed new or renewal leases totaling over 50% of our

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total portfolio square footage during that time period, we have experienced some lease terminations and contractions, and have granted market concessions such as free rent periods. Additionally, in some instances we have had to accept lower market driven rental rates in conjunction with securing these new or renewal leases. All of these items have negatively impacted our occupancy and SSNOI.

Occupancy

Currently, we have leasing exposure in the Washington D.C. and downtown Chicago markets which will negatively impact our leased percentage until we are able to re-lease these spaces. However, scheduled expirations over the next five years are limited to less than 10% of our ALR on an annual basis. In addition, many leases executed during our period of high lease rollover have recently commenced or will commence over the next twelve months. As a result, our leased percentage for the portfolio as a whole has been slowly improving over the last eighteen months; however, the loss of a large 330,000 square foot governmental tenant at our One Independence Square building in Washington, D.C during first quarter of 2013 negated this improvement such that our leased percentage decreased from 87.0% leased as of September 30, 2012 to 86.7% leased as of September 30, 2013.

SSNOI

Although most of the space associated with the leases that have expired over the last several years has been re-leased, some of these replacement leases have not yet commenced as refurbishment of the space is not complete. Commencement of new leases typically occurs 6-24 months from the execution date. In addition, office leases typically contain upfront rental abatement periods which delay the cash flow benefits of the lease even once it has commenced. As of September 30, 2013, approximately 1.5 million square feet of commenced leases were in some form of abatement, and approximately 0.5 million square feet of executed leases for currently vacant space were yet to commence.

Further, in some cases over the last two years, we have entered into leases at lower market rental rates than the previous tenant's rental rate that will negatively impact SSNOI comparisons once they commence. However, for leases that were executed during the current quarter for space that was previously occupied within the past year, initial cash rents will increase approximately 2.9% once the leases commence and any abatement periods expire.

As a result of all of the factors mentioned above, coupled with the loss of a 330,000 square foot governmental tenant at our One Independence Square building in Washington, D.C during first quarter of 2013, we anticipate that SSNOI will decrease for the year ending December 31, 2013 as compared to the year ended December 31, 2012 by approximately 1% to 2%. As a result of serving large, credit worthy tenants, our average lease size tends to be larger than our peers. The expiration and commencement of these larger leases, and their related abatements, create volatility in our SSNOI. As such, absent any near-term leasing success in the Washington, D.C or downtown Chicago markets, SSNOI will likely decline in 2014. However, we expect to realize positive growth in our SSNOI moving into 2015 and beyond, as rent abatements burn off and new leases commence.

Election as a REIT

We have elected to be taxed as a REIT under the Code and have operated as such beginning with our taxable year ended December 31, 1998. To qualify as a REIT, we must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of our adjusted REIT taxable income, computed without regard to the dividends-paid deduction and by excluding net capital gains attributable to our stockholders, as defined by the Code. As a REIT, we generally will not be subject to federal income tax on income that we distribute to our stockholders. If we fail to qualify as a REIT in any taxable year, we may be subject to federal income taxes on our taxable income for that year and for the four years following the year during which qualification is lost and/or penalties, unless the IRS grants us relief under certain statutory provisions. Such an event could materially adversely affect our net income and net cash available for distribution to our stockholders. However, we believe that we are organized and operate in such a manner as to qualify for treatment as a REIT and intend to continue to operate in the foreseeable future in such a manner that we will remain qualified as a REIT for federal income tax purposes. We have elected to treat Piedmont Office Holdings, Inc. (“POH”), a wholly-owned subsidiary of Piedmont, as a taxable REIT subsidiary. We perform non-customary services for tenants of buildings that we own, including solar power generation, real estate and non-real estate related-services; however, any earnings related to such services performed by our taxable REIT subsidiary are subject to federal and state income taxes. In addition, for us to continue to qualify as a REIT, our investments in taxable REIT subsidiaries cannot exceed 25% of the value of our total assets.

Inflation

We are exposed to inflation risk, as income from long-term leases is the primary source of our cash flows from operations. There are provisions in the majority of our tenant leases that are intended to protect us from, and mitigate the risk of, the impact of inflation. These provisions include rent steps, reimbursement billings for operating expense pass-through charges, real estate tax, and insurance

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reimbursements on a per square-foot basis, or in some cases, annual reimbursement of operating expenses above certain per square-foot allowance. However, due to the long-term nature of the leases, the leases may not readjust their reimbursement rates frequently enough to fully cover inflation.

Off-Balance Sheet Arrangements

We are not dependent on off-balance sheet financing arrangements for liquidity. Our off-balance sheet arrangements consist of our investments in unconsolidated joint ventures and operating lease obligations related to ground leases at certain of our properties. The unconsolidated joint ventures in which we currently invest are prohibited by their governing documents from incurring debt. For further information regarding our commitments under operating lease obligations, see the Contractual Obligations table below.

Application of Critical Accounting Policies

Our accounting policies have been established to conform with GAAP. The preparation of financial statements in conformity with GAAP requires management to use judgment in the application of accounting policies, including making estimates and assumptions. These judgments affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the dates of the financial statements and the reported amounts of revenue and expenses during the reporting periods. If our judgment or interpretation of the facts and circumstances relating to various transactions had been different, it is possible that different accounting policies would have been applied, thus, resulting in a different presentation of the financial statements. Additionally, other companies may utilize different estimates that may impact comparability of our results of operations to those of companies in similar businesses. The critical accounting policies outlined below have been discussed with members of the Audit Committee of the board of directors.

Investment in Real Estate Assets

We are required to make subjective assessments as to the useful lives of our depreciable assets. We consider the period of future benefit of the asset to determine the appropriate useful lives. These assessments have a direct impact on net income attributable to Piedmont. The estimated useful lives of our assets by class are as follows:

Buildings	40 years
Building improvements	5-25 years
Land improvements	20-25 years
Tenant improvements	Shorter of economic life or lease term
Intangible lease assets	Lease term

Allocation of Purchase Price of Acquired Assets

Upon the acquisition of real properties, it is our policy to allocate 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, other value of in-place leases, and value of tenant relationships, based in each case on their estimated fair values.

The fair values of the tangible assets of an acquired property (which includes land and buildings) 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 our determination of the fair value of these assets. We determine the as-if-vacant fair value of a property using methods similar to those used by independent appraisers. Factors considered by us in performing these analyses include an estimate of carrying costs during the expected lease-up periods considering current market conditions and costs to execute similar leases. In estimating carrying costs, we include real estate taxes, insurance, and other operating expenses and estimates of lost rental revenue during the expected lease-up periods based on current market demand. We also estimate the cost to execute similar leases including leasing commissions, legal, and other related costs.

The fair values of above-market and below-market in-place lease values are recorded based on the present value (using an interest rate that 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) our estimate of fair market lease rates for the corresponding in-place leases, measured over a period equal to the remaining noncancelable term of the lease. The above-market and below-market lease values are capitalized as intangible lease assets and liabilities and amortized as an adjustment of rental income over the remaining terms of the respective leases.

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The fair values of in-place leases include direct costs associated with obtaining a new tenant, opportunity costs associated with lost rentals that are avoided by acquiring an in-place lease, and tenant relationships. Direct costs associated with obtaining a new 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 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. Customer relationships are valued based on expected renewal of a lease or the likelihood of obtaining a particular tenant for other locations. 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.

Estimates of the fair values of the tangible and intangible assets require us to estimate market lease rates, property operating expenses, carrying costs during lease-up periods, discount rates, market absorption periods, and the number of years the property is held for investment. The use of inappropriate estimates would result in an incorrect assessment of our purchase price allocations, which could impact the amount of our reported net income attributable to us.

Valuation of Real Estate Assets and Investments in Joint Ventures Which Hold Real Estate Assets

We continually monitor events and changes in circumstances that could indicate that the carrying amounts of the real estate and related intangible assets, both operating properties and properties under construction, in which we have an ownership interest, either directly or through investments in joint ventures, may not be recoverable. When indicators of potential impairment are present which indicate that the carrying amounts of real estate and related intangible assets may not be recoverable, we assess the recoverability of these assets by determining whether the carrying value will be recovered through the undiscounted future operating cash flows expected from the use of the asset and its eventual disposition. In the event that such expected undiscounted future cash flows do not exceed the carrying value, we adjust the real estate and related intangible assets to the fair value and recognize an impairment loss.

Projections of expected future cash flows require that we estimate future market rental income amounts subsequent to the expiration of current lease agreements, property operating expenses, the number of months it takes to re-lease the property, and the number of years the property is held for investment, among other factors. The subjectivity of assumptions used in the future cash flow analysis, including capitalization and discount rates, could result in an incorrect assessment of the property’s fair value and, therefore, could result in the misstatement of the carrying value of our real estate and related intangible assets and our net income attributable to us. We have determined that other than the impairment charge recognized upon reclassifying the 1111 Durham Avenue building for subsequent disposition of approximately $6.4 million, there has been no impairment in the carrying value of real estate assets owned by us or any of our unconsolidated joint ventures as of September 30, 2013. See Note 9 of our accompanying consolidated financial statements for more detail on the 1111 Durham Avenue building.

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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, as well as costs incurred as part of the acquisition. We test the carrying value of our 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. We have the option, should we choose to use it, to first assess 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, we conclude that the estimated fair value is greater than the carrying amount, then performing the two-step impairment test is unnecessary. However, if we chose 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. We have determined that there have been no events or circumstances that would indicate that the carrying amount may be impaired as of September 30, 2013.

Investment in Variable Interest Entities

VIEs are defined by GAAP as entities in which equity investors do not have sufficient equity at risk for the entity to finance its activities without additional subordinated financial support from other parties. If an entity is determined to be a VIE, it must be consolidated by the primary beneficiary. The primary beneficiary is the enterprise that has the power to direct the activities of the VIE that most significantly impact the VIE’s economic performance, absorbs the majority of the entity’s expected losses, or receives a majority of the entity’s expected residual returns. Generally, expected losses and expected residual returns are the anticipated negative and positive variability, respectively, in the fair value of the VIE’s net assets. When we make an investment, we assess whether the investment represents a variable interest in a VIE and, if so, whether we are the primary beneficiary of the VIE. Incorrect assumptions or assessments may result in an inaccurate determination of the primary beneficiary. The result could be the consolidation of an entity acquired or formed in the future that would otherwise not have been consolidated or the non-consolidation of such an entity that would otherwise have been consolidated.

We evaluate each investment to determine whether it represents variable interests in a VIE. Further, we evaluate the sufficiency of the entities’ equity investment at risk to absorb expected losses, and whether as a group, the equity has the characteristics of a controlling financial interest. See Note 6 of our accompanying consolidated financial statements for more detail on our VIEs as of September 30, 2013.

Interest Rate Derivatives

We periodically enter into interest rate derivative agreements to hedge our exposure to changing interest rates on variable rate debt instruments. As required by GAAP, we record all derivatives on the balance sheet at fair value. We reassess the effectiveness of our 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, we do 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 our interest rate derivative agreements as of September 30, 2013 are designated as cash flow hedges. See Note 5 of our accompanying consolidated financial statements for more detail on our derivative agreements as of September 30, 2013.

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Stock-based Compensation

We have issued stock-based compensation in the form of restricted stock to our employees and directors. For employees, such compensation has been issued pursuant to our 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.

Contractual Obligations

Our contractual obligations as of September 30, 2013 are as follows (in thousands):

	Payments Due by Period
Contractual Obligations	Total		Less than 1 year		1-3 years		3-5 years			More than 5 years
Long-term debt(1)	$	1,823,175	$	575,000	$	417,000	$	482,525	(2)	$	348,650	(4)
Operating lease obligations(3)	77,414		753		1,506		1,506			73,649
Total	$	1,900,589	$	575,753	$	418,506	$	484,031		$	422,299

⁽¹⁾  Amounts include principal payments only and balances outstanding as of September 30, 2013. We made interest payments, including payments under our interest rate swaps, of approximately $47.3 million during the nine months endedSeptember 30, 2013, and expect to pay interest in future periods on outstanding debt obligations based on the rates and terms disclosed herein and in Note 4 of our accompanying consolidated financial statements.

⁽²⁾  Includes the $300 Million Unsecured Term Loan which has a stated variable rate; however, we entered into interest rate swap agreements which effectively fix, exclusive of changes to our credit rating, the rate on this facility to 2.69% through maturity. As such, we estimate incurring, exclusive of changes to our credit rating, approximately $8.1 million per annum in total interest (comprised of combination of variable contractual rate and settlements under interest rate swap agreements) through maturity in November 2016.

⁽³⁾  Three properties (the River Corporate Center building in Tempe, Arizona; the 8700 South Price Road building in Tempe, Arizona; and the 2001 NW 64th Street building in Ft. Lauderdale, Florida) are subject to ground leases with expiration dates ranging between 2048 and 2101. The aggregate remaining payments required under the terms of these operating leases as of September 30, 2013 are presented above.

⁽⁴⁾  Amount includes the Senior Notes which have a contractual amount due at maturity (June 1, 2023) of $350 million, but were issued in May 2013 at a discount to par. Such discount is amortized quarterly over the life of the notes, and the net amount of the Senior Notes is reflected as of September 30, 2013.

Commitments and Contingencies

We are subject to certain commitments and contingencies with regard to certain transactions. Refer to Note 8 of our consolidated financial statements for further explanation. Examples of such commitments and contingencies include:

• Commitments Under Existing Lease Agreements;

• Contingencies Related to Tenant Audits/Disputes; and

• Letters of Credit.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our future income, cash flows, and fair values of our financial instruments depend in part upon prevailing market interest rates. Market risk is the exposure to loss resulting from changes in interest rates, foreign currency, exchange rates, commodity prices, and equity prices. As a result, the primary market risk to which we believe we are exposed is interest rate risk. Many factors, including governmental monetary and tax policies, domestic and international economic and political considerations, and other factors that are beyond our control contribute to interest rate risk. Our interest rate risk management objectives are to limit the impact of interest rate changes on earnings and cash flow primarily through a low-to-moderate level of overall borrowings, as well as managing the variability in rate fluctuations on our outstanding debt. As such, a significant portion of our debt is based on fixed interest rates, including our most recent issuance of Senior Notes, to hedge against instability in the credit markets. Our exposure to market risk includes interest rate fluctuations in connection with any borrowings under our $500 Million Unsecured Line of Credit and our $300 Million Unsecured Term Loan, although we have effectively fixed the interest rate on our $300 Million

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Unsecured Term Loan through interest rate swap agreements, provided that we maintain our corporate credit rating. We do not enter into derivative or interest rate transactions for speculative purposes.

All of our debt was entered into for other than trading purposes, and the estimated fair value of our debt as of September 30, 2013 was approximately $1.8 billion. Our interest rate swap agreements in place as of September 30, 2013 carried notional amounts totaling $580 million. Of these interest rate swap agreements, the agreements which hedge the cash flows under our $300 Million Unsecured Term Loan have fixed interest rates of 2.69%, exclusive of changes to our credit rating. See Notes 4, 5 and 7 of our accompanying consolidated financial statements for further detail.

As of September 30, 2013, all of our outstanding debt, except for amounts outstanding under our $500 Million Unsecured Line of Credit, is subject to fixed, or effectively fixed, interest rates. Our total outstanding debt subject to fixed or effectively fixed interest rates has an average effective interest rate of approximately 4.35% per annum with expirations ranging from 2014 to 2023. A change in the market interest rate impacts the net financial instrument position of our fixed-rate debt portfolio but has a minimal impact on interest incurred or cash flows.

As of September 30, 2013, we had $187.0 million outstanding on our $500 Million Unsecured Line of Credit, which is the only debt facility subject to variable interest rates. Our $500 Million Unsecured Line of Credit currently has a stated rate of LIBOR plus 1.175% per annum or the prime rate, at the our discretion. Draws outstanding as of September 30, 2013 were subject to a blended rate of 1.36% as of September 30, 2013. To the extent that we borrow additional funds in the future under the $500 Million Unsecured Line of Credit or potential future variable-rate lines of credit, we would have exposure to increases in interest rates, which would potentially increase our cost of debt. Additionally, a 1.0% increase in variable interest rates on borrowings outstanding as of September 30, 2013 would increase interest expense approximately $1.9 million on a per annum basis.

ITEM 4. CONTROLS AND PROCEDURES

Management’s Conclusions Regarding the Effectiveness of Disclosure Controls and Procedures

We carried out an evaluation, under the supervision and with the participation of management, including the Principal Executive Officer and the Principal Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures as defined in Rule 15d-15(e) of the Securities Exchange Act of 1934 (the “Exchange Act”) as of the end of the quarterly period covered by this report. Based upon that evaluation, the Principal Executive Officer and the Principal Financial Officer concluded that our disclosure controls and procedures were effective as of the end of the period covered by this quarterly report in providing a reasonable level of assurance that information we are required to disclose in the reports we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in applicable SEC rules and forms, including providing a reasonable level of assurance that information required to be disclosed by us in the reports we file under the Exchange Act is accumulated and communicated to our management, including the Principal Executive Officer and the Principal Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

There were no changes in our internal control over financial reporting during the quarter ended September 30, 2013 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

We are from time to time a party to other legal proceedings, which arise in the ordinary course of our business. We are not currently involved in any litigation the outcome of which would, in management’s judgment based on information currently available, have a material adverse effect on our results of operations or financial condition, nor is management aware of any such litigation threatened against us during the quarter ended June 30, 2013 requiring disclosure under Item 103 of Regulation S-K.

ITEM 1A. RISK FACTORS

There have been no known material changes from the risk factors previously disclosed in our Annual Report on Form 10-K for the year ended December 31, 2012.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

(a) There were no unregistered sales of equity securities during the third quarter 2013.

(b) Not applicable.

(c) During the quarter ended September 30, 2013, Piedmont repurchased shares of its common stock in the open market, in order to reissue such shares under its dividend reinvestment plan (the "DRP"), as well as repurchasing and retiring shares as part of our previously announced stock repurchase plan.

Of the 5,553,176 shares repurchased during the third quarter 2013, 5,411,760 shares related to repurchases of our common stock pursuant to our previously announced stock repurchase plan, and 141,416 shares related to shares purchased by our transfer agent on the open market and conveyed to participants in the DRP. The aggregate stock repurchases for the quarter ended September 30, 2013 are as follows:

Period	Total Number of Shares Purchased (in 000’s)	Average Price Paid per Share		Total Number of Shares  Purchased as Part of Publicly Announced Plan (in 000’s) (1)	Maximum Approximate Dollar Value of Shares Available That May Yet Be Purchased Under the Plan (in 000’s)(1)
July 1, 2013 to July 31, 2013	299	$	18.15	299	$	184,751
August 1, 2013 to August 31, 2013	2,617	$	17.40	2,617	$	139,149
September 1, 2013 to September 30, 2013	2,637	$	17.41	2,496	$	95,668	(1)
Total	5,553	$	17.45	5,412

⁽¹⁾  Under our amended and restated DRP announced in our Current Report on Form 8-K filed February 24, 2011, we have the option to either issue shares that we purchase in the open market or issue shares directly from Piedmont from authorized but unissued shares. Such election will take place at the settlement of each quarterly dividend in which there are participants in our DRP, and may change from quarter to quarter based on our judgment of the best use of proceeds for Piedmont. Therefore, the "Maximum Approximate Dollar Value of Shares Available That May Yet Be Purchased Under the Plan" relates only to the stock repurchase plan. The stock repurchase plan was previously announced in our Quarterly Report on Form 10-Q filed November 3, 2011. On October 30, 2013, our board of directors amended and restated the plan to authorize $150 million in stock repurchases over the next two years. The stock repurchase plan is separate from shares purchased for DRP issuance.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

Not applicable.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

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ITEM 6. EXHIBITS

The Exhibits required to be filed with this report are set forth on the Exhibit Index to Third Quarter 2013 Form 10-Q of Piedmont Office Realty Trust, Inc. attached hereto.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

		PIEDMONT OFFICE REALTY TRUST, INC.
		(Registrant)
Dated:	October 31, 2013	By:	/s/ Robert E. Bowers
			Robert E. Bowers
			Chief Financial Officer and Executive Vice President
			(Principal Financial Officer and Duly Authorized Officer)

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EXHIBIT INDEX

TO

THIRD QUARTER 2013

FORM 10-Q

OF

PIEDMONT OFFICE REALTY TRUST, INC.

Exhibit Number	Description of Document
3.1	Third Articles of Amendment and Restatement of Piedmont Office Realty Trust, Inc. (the “Company”) (incorporated by reference to Exhibit 3.1 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2009 filed on March 16, 2010)
3.2	Articles of Amendment of the Company effective June 30, 2011 (incorporated by reference to Exhibit 3.2 to the Company's Current Report on Form 8-K filed on July 6, 2011)
3.3	Articles Supplementary of the Company effective June 30, 2011 (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on July 6, 2011)
3.4	Amended and Restated Bylaws of the Company (incorporated by reference to Exhibit 3.2 to the Company’s current Report on Form 8-K filed on January 22, 2010)
31.1	Rule 13a-14(a)/15d-14(a) Certification, executed by Donald A. Miller, CFA, Principal Executive Officer of the Company
31.2	Rule 13a-14(a)/15d-14(a) Certification, executed by Robert E. Bowers, Principal Financial Officer of the Company
32.1	Certification required by Rule 13a-14(b)/15d-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code, executed by Donald A. Miller, CFA, Chief Executive Officer and President of the Company
32.2	Certification required by Rule 13a-14(b)/15d-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code, executed by Robert E. Bowers, Chief Financial Officer and Executive Vice-President of the Company
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema
101.CAL	XBRL Taxonomy Extension Calculation Linkbase
101.DEF	XBRL Taxonomy Extension Definition Linkbase
101.LAB	XBRL Taxonomy Extension Label Linkbase
101.PRE	XBRL Taxonomy Extension Presentation Linkbase

52

EX-31.1

EXHIBIT 31.1

PRINCIPAL EXECUTIVE OFFICER CERTIFICATION

PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Donald A. Miller, CFA, certify that:

1. I have reviewed this Form 10-Q for the quarter ended September 30, 2013 of Piedmont Office Realty Trust, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: October 31, 2013

By:	/s/ Donald A. Miller, CFA
	Donald A. Miller, CFA
	Chief Executive Officer and President (Principal Executive Officer)

EX-31.2

EXHIBIT 31.2

PRINCIPAL FINANCIAL OFFICER CERTIFICATION

PURSUANT TO

SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Robert E. Bowers, certify that:

1. I have reviewed this Form 10-Q for the quarter ended September 30, 2013 of Piedmont Office Realty Trust, Inc.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Dated: October 31, 2013

By:	/s/ Robert E. Bowers
	Robert E. Bowers
	Chief Financial Officer and Executive Vice President (Principal Financial Officer)

EX-32.1

EXHIBIT 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER

PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (18 U.S.C. 1350)

In connection with the Report of Piedmont Office Realty Trust, Inc. (the “Registrant”) on Form 10-Q for the quarter ended September 30, 2013, as filed with the Securities and Exchange Commission (the “Report”), the undersigned, Donald A. Miller, CFA, Chief Executive Officer of the Registrant, hereby certifies, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge and belief:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

By:	/s/ Donald A. Miller, CFA
	Donald A. Miller, CFA
	Chief Executive Officer and President
	October 31, 2013

EX-32.2

EXHIBIT 32.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002 (18 U.S.C. 1350)

In connection with the Report of Piedmont Office Realty Trust, Inc. (the “Registrant”) on Form 10-Q for the quarter ended September 30, 2013, as filed with the Securities and Exchange Commission (the “Report”), the undersigned, Robert E. Bowers, Chief Financial Officer of the Registrant, hereby certifies, pursuant to 18 U.S.C. §1350, as adopted pursuant to §906 of the Sarbanes-Oxley Act of 2002, that, to the best of my knowledge and belief:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Registrant.

By:	/s/ Robert E. Bowers
	Robert E. Bowers
	Chief Financial Officer and Executive Vice President
	October 31, 2013

XML

Discontinued Operations

9 Months Ended

Sep. 30, 2013

Discontinued Operations and Disposal Groups [Abstract]

Discontinued Operations

Discontinued Operations

Piedmont has classified the results of operations related to the following properties as discontinued operations (in thousands):

Building(s) Sold	Location	Date of Sale	Gain/(Loss) on Sale			Net Sales Proceeds
Portland Portfolio(1)	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	$	16,267		$	45,574
350 Spectrum Loop(2)	Colorado Springs, Colorado	Held for Sale(2)	N/A			N/A

⁽¹⁾  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.

⁽²⁾  On September 30, 2013, Piedmont entered into a binding agreement to sell the 350 Spectrum Loop building with an expected close in November 2013, and in accordance with GAAP, Piedmont reclassified the building from real estate assets held-for-use to real estate assets held-for-sale on its consolidated balance sheet as of September 30, 2013. As such, Piedmont reclassified the operational results of the property as income from discontinued operations for prior periods to conform with current period presentation.

Sale of 1111 Durham Avenue building

In accordance with GAAP during the quarter ended March 31, 2013, Piedmont re-classified the 1111 Durham Avenue building from real estate assets held-for-use (at cost) to real estate assets held for sale (at estimated fair value) and recorded an impairment charge of $6.4 million, which represents the difference in carrying value of the asset at the time the asset met the held for sale criteria. The fair value measurement used in the evaluation of this non-financial asset is considered to be a Level 1 valuation within the fair value hierarchy as defined by GAAP, as there are direct observations and transactions involving the asset. After assessing the age of the building (constructed in 1975) and leasing prospects, Piedmont determined that the sales price should appropriately represent the land value of the asset. As a result, Piedmont disposed of the 1111 Durham Avenue building for a gross sale price of approximately $4.0 million, exclusive of closing costs. The transaction closed on March 28, 2013.

Assets Held for Sale

The details comprising assets held for sale, consisting solely of the 350 Spectrum Loop building, are presented below (in thousands):

	September 30, 2013		December 31, 2012
Real estate assets held for sale, net:
Land	$	2,185	$	2,186
Building and improvements, less accumulated depreciation of $6,737 and $6,313 as of September 30, 2013 and December 31, 2012, respectively	16,332		16,755
Construction in progress	1,217		—
Total real estate assets held for sale, net	$	19,734	$	18,941
Other assets held for sale:
Straight-line rent	$	1,018	$	793
Deferred lease costs, less accumulated amortization of $78 and $0 as of September 30, 2013 and December 31, 2012, respectively	942		—
Total other assets held for sale, net	$	1,960	$	793

Income from Discontinued Operations

The details comprising income from discontinued operations are presented below (in thousands):

	Three Months Ended						Nine Months Ended
	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Revenues:
Rental income	$	516		$	2,388		$	2,693		$	8,403
Tenant reimbursements	91			410			650			1,298
	607			2,798			3,343			9,701
Expenses:
Property operating costs	316			1,262			1,448			3,834
Depreciation	141			732			687			2,379
Amortization	21			159			138			527
General and administrative	—			38			2			47
	478			2,191			2,275			6,787
Other income (expense):
Interest and other income/(expense)	(1		)	—			24			—
Net recoveries of casualty loss	—			—			17			—
	(1		)	—			41			—
Operating income, excluding gain/(loss) on sale	128			607			1,109			2,914
Impairment loss	—			—			(6,402		)	—
Gain/(loss) on sale of real estate assets	—			(254		)	16,258			27,583
Income from discontinued operations	$	128		$	353		$	10,965		$	30,497

XML

Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:
Rental income	$ 116,810	$ 104,948	$ 333,855	$ 312,007
Tenant reimbursements	27,418	27,132	77,168	80,290
Property management fee revenue	890	520	2,034	1,720
Total revenues	145,118	132,600	413,057	394,017
Expenses:
Property operating costs	58,767	50,483	164,420	154,568
Depreciation	30,785	27,921	90,688	81,721
Amortization	13,878	15,165	34,244	39,095
General and administrative	5,841	5,508	16,678	15,629
Operating Expenses	109,271	99,077	306,030	291,013
Real estate operating income	35,847	33,523	107,027	103,004
Other income (expense):
Interest expense	(19,331)	(16,247)	(53,932)	(48,727)
Interest and other income/(expense)	(611)	383	(1,960)	765
Litigation settlement recovery/(expense)	0	(7,500)	1,250	(7,500)
Net recoveries of casualty loss	3,919	0	6,061	0
Equity in income of unconsolidated joint ventures	46	323	604	739
Loss on consolidation	(898)	0	(898)	0
Nonoperating Income (Expense)	(16,875)	(23,041)	(48,875)	(54,723)
Income from continuing operations	18,972	10,482	58,152	48,281
Discontinued operations:
Operating income	128	607	1,109	2,914
Impairment loss	0	0	(6,402)	0
Gain/(loss) on sale of real estate assets	0	(254)	16,258	27,583
Income from discontinued operations	128	353	10,965	30,497
Net income	19,100	10,835	69,117	78,778
Less: Net income attributable to noncontrolling interest	(4)	(4)	(12)	(12)
Net income attributable to Piedmont	$ 19,096	$ 10,831	$ 69,105	$ 78,766
Per share information – basic and diluted:
Income from continuing operations (in dollars per share)	$ 0.12	$ 0.06	$ 0.35	$ 0.28
Income/(loss) from discontinued operations (in dollars per share)	$ 0.00	$ 0.00	$ 0.06	$ 0.18
Net income available to common stockholders (in dollars per share)	$ 0.12	$ 0.06	$ 0.41	$ 0.46
Weighted-average common shares outstanding – basic	164,683,173	168,805,589	166,597,577	171,162,281
Weighted-average common shares outstanding – diluted	164,796,275	168,929,039	166,734,464	171,295,098

XML

Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation

The consolidated financial statements of Piedmont have been prepared in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”), including the instructions to Form 10-Q and Article 10 of Regulation S-X, and do not include all of the information and footnotes required by U.S. generally accepted accounting principles (“GAAP”) for complete financial statements. In the opinion of management, the statements for the unaudited interim periods presented include all adjustments, which are of a normal and recurring nature, necessary for a fair presentation of the results for such periods. Results for these interim periods are not necessarily indicative of a full year’s results and 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 nine months endedSeptember 30, 2013 and during the year ended December 31, 2012 (see Note 9), as well as reclassifying other rental income as rental income to be consistent with current period presentation, as further described in "Revenue Recognition" below. None of these reclassifications affect net income attributable to Piedmont as presented in previous periods.

Piedmont’s consolidated financial statements 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. For further information, refer to the financial statements and footnotes included in Piedmont’s Annual Report on Form 10-K for the year ended December 31, 2012, as well as the Current Report on Form 8-K containing Exhibit 99.1 filed on June 4, 2013, for the purpose of recasting certain sections of Piedmont's Annual Report on Form 10-K for the year ended December 31, 2012 for dispositions subsequent to December 31, 2012.

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.

Deferred Lease Costs

Deferred lease costs are comprised of costs and incentives incurred to acquire operating leases, including intangible lease origination costs and direct payroll costs incurred related to negotiating and executing specific leases, and are capitalized and amortized on a straight-line basis over the terms of the related underlying leases. The amortization of deferred lease costs and intangibles is recorded as amortization expense in the accompanying consolidated statements of 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.

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 recognized through impairment charges when identified.

Income Taxes

Piedmont has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (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. Piedmont is subject to certain taxes related to the operations of properties in certain locations, as well as operations conducted by its taxable REIT subsidiary, POH, which have been provided for in the financial statements.

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Debt (Tables)

9 Months Ended

Sep. 30, 2013

Line of Credit and Notes Payable [Abstract]

Schedule of Debt

The following table summarizes the terms of Piedmont’s indebtedness outstanding as of September 30, 2013 and December 31, 2012 (in thousands):

Facility	Collateral	Rate(1)			Maturity	Amount Outstanding as of
						September 30, 2013		December 31, 2012
Secured (Fixed)
$200.0 Million Mortgage Note	Aon Center	4.87	%		5/1/2014	$	200,000	$	200,000
$25.0 Million Mortgage Note	Aon Center	5.70	%		5/1/2014	25,000		25,000
$350.0 Million Secured Pooled Facility	Nine Property Collateralized Pool (2)	4.84	%		6/7/2014	350,000		350,000
$105.0 Million Fixed-Rate Loan	US Bancorp Center	5.29	%		5/11/2015	105,000		105,000
$125.0 Million Fixed-Rate Loan	Four Property Collateralized Pool (3)	5.50	%		4/1/2016	125,000		125,000
$42.5 Million Fixed-Rate Loan	Las Colinas Corporate Center I & II	5.70	%		10/11/2016	42,525		42,525
$140.0 Million WDC Mortgage Notes	1201 & 1225 Eye Street	5.76	%		11/1/2017	140,000		140,000
Subtotal/Weighted Average (4)		5.17	%			987,525		987,525
Unsecured (Variable and Fixed)
$300 Million Unsecured Term Loan		LIBOR +  1.45%		(5)	11/22/2016	300,000		300,000
$500 Million Unsecured Line of Credit		1.36	%	(6)	8/19/2016	187,000		129,000
$350 Million Senior Notes		3.40	%	(7)	6/1/2023	348,650		—
Subtotal/Weighted Average (4)		2.71	%			835,650		429,000
Total/ Weighted Average (4)		4.04	%			$	1,823,175	$	1,416,525

⁽¹⁾  All of Piedmont’s outstanding debt as of September 30, 2013 and December 31, 2012 is interest-only debt.

⁽²⁾  Nine property collateralized pool includes: 1200 Crown Colony Drive, Braker Pointe III, 2 Gatehall Drive, One and Two Independence Square, 2120 West End Avenue, 400 Bridgewater Crossing, 200 Bridgewater Crossing, and Fairway Center II.

⁽³⁾  Four property collateralized pool includes 1430 Enclave Parkway, Windy Point I and II, and 1055 East Colorado Boulevard.

⁽⁴⁾  Weighted average is based on contractual balance of outstanding debt and interest rates in the table as of September 30, 2013, except for the $350 Million Senior Notes, which were issued at a discount (see footnote 7 below).

⁽⁵⁾  The $300 Million Unsecured 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%.

⁽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 September 30, 2013) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of September 30, 2013 consisted of 30-day LIBOR draws ranging from 0.18% to 0.19% (subject to the additional spread mentioned above).

⁽⁷⁾  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%.

XML

Stock Based Compensation

9 Months Ended

Sep. 30, 2013

Disclosure of Compensation Related Costs, Share-based Payments [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 nine months endedSeptember 30, 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 Nine Months Ended September 30, 2013	161,257		$	19.47
Deferred Stock Awards Vested During Nine Months Ended September 30, 2013	(204,295	)	$	18.93
Deferred Stock Awards Forfeited During Nine Months Ended September 30, 2013	(2,862	)	$	18.55
Unvested Deferred Stock Awards as of September 30, 2013	272,993		$	18.64

The following table provides additional information regarding stock award activity during the three and nine months endedSeptember 30, 2013 and 2012, respectively (in thousands except for per share data):

	Three Months Ended				Nine Months Ended
	September 30, 2013		September 30, 2012		September 30, 2013		September 30, 2012
Weighted-Average Grant Date Fair Value of Shares Granted During the Period	$	—	$	17.10	$	19.47	$	17.48
Total Grant Date Fair Value of Shares Vested During the Period	$	28	$	28	$	3,867	$	5,241
Share-based Liability Awards Paid During the Period(1)	$	—	$	—	$	103	$	798

⁽¹⁾  Amounts reflect the issuance of performance share awards during the period.

A detail of Piedmont’s outstanding employee deferred stock awards as of September 30, 2013 is as follows:

Date of grant	Type of Award	Net Shares Granted (1)	Grant Date Fair Value		Vesting Schedule	Unvested Shares as of September 30, 2013
April 5, 2011	Annual Deferred Stock Award	116,116	$	19.40	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on April 5, 2012, 2013, and 2014, respectively.	37,196
April 5, 2011	Fiscal Year 2011-2013 Performance Share Program	—	$	18.27	Shares awarded, if any, will vest immediately upon determination of award in 2014.	—	(2)
April 4, 2012	Annual Deferred Stock Award	191,786	$	17.53	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 4, 2013, 2014, and 2015, respectively.	116,289
April 4, 2012	Fiscal Year 2012-2014 Performance Share Program	—	$	17.42	Shares awarded, if any, will vest immediately upon determination of award in 2015.	—	(2)
April 2, 2013	Annual Deferred Stock Award	146,679	$	19.47	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 2, 2014, 2015, and 2016, respectively.	119,508
April 2, 2013	Fiscal Year 2013-2015 Performance Share Program	—	$	18.91	Shares awarded, if any, will vest immediately upon determination of award in 2016.	—	(2)
Total						272,993

⁽¹⁾  Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through September 30, 2013.

⁽²⁾  Estimated based on Piedmont's cumulative total stockholder return ("TSR") for the respective performance period through September 30, 2013. As of September 30, 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 three months endedSeptember 30, 2013 and 2012, respectively, Piedmont recognized approximately $0.7 million and $0.9 million of compensation expense related to stock awards, all of which related to the amortization of nonvested shares. During the nine months endedSeptember 30, 2013 and 2012, respectively, Piedmont recognized approximately $3.0 million and $3.1 million of compensation expense related to stock awards, of which approximately $1.8 million and $1.8 million relates to the amortization of nonvested shares, respectively. During the nine months endedSeptember 30, 2013, a total of 147,515 shares were issued to employees, directors, and officers. As of September 30, 2013, approximately $2.5 million of unrecognized compensation cost related to nonvested, annual deferred stock awards remained, which Piedmont will record in its consolidated statements of income over a weighted-average vesting period of approximately one year.

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Earnings Per Share (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings Per Share [Abstract]
Weighted-average common shares – basic	164,683,173	168,805,589	166,597,577	171,162,281
Restricted stock awards (in shares)	113,102	123,450	136,887	132,817
Weighted-average common shares – diluted	164,796,275	168,929,039	166,734,464	171,295,098

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Derivative Instruments (Details) (USD $)	9 Months Ended			3 Months Ended		9 Months Ended						12 Months Ended								0 Months Ended		0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012	Sep. 30, 2013 Interest Rate Swap [Member] Interest Expense [Member]	Sep. 30, 2012 Interest Rate Swap [Member] Interest Expense [Member]	Sep. 30, 2013 Interest Rate Swap [Member] Interest Expense [Member]	Sep. 30, 2012 Interest Rate Swap [Member] Interest Expense [Member]	Sep. 30, 2013 Interest Rate Swap 1 [Member]	Sep. 30, 2013 Interest Rate Swap 2 [Member]	Sep. 30, 2013 Interest Rate Swap 3 [Member]	Sep. 30, 2013 Interest Rate Swap 4 [Member]	Sep. 30, 2013 Forward Starting Interest Rate Swap [Member] contract	Sep. 30, 2013 Forward Starting Interest Rate Swap 3 [Member]	Sep. 30, 2013 Forward Starting Interest Rate Swap 4 [Member]	Sep. 30, 2013 Forward Starting Interest Rate Swap 5 [Member]	Sep. 30, 2013 Forward Starting Interest Rate Swap 6 [Member]	Sep. 30, 2013 Credit Risk Contract [Member]	Sep. 30, 2013 Debt [Member]	Sep. 30, 2013 Unsecured Debt [Member] $300 Million Unsecured Term Loan [Member] contract	May 09, 2013 Senior Notes [Member] $350 Million Senior Notes [Member]	Sep. 30, 2013 Senior Notes [Member] $350 Million Senior Notes [Member]	May 09, 2013 Senior Notes [Member] $350 Million Senior Notes [Member] Forward Starting Interest Rate Swap [Member]	Sep. 30, 2013 Senior Notes [Member] $350 Million Senior Notes [Member] Forward Starting Interest Rate Swap [Member] agreement
Derivative [Line Items]
Number of forward starting swaps																			4
Total notional value of forward starting swap agreements	$ 580,000,000							$ 125,000,000	$ 75,000,000	$ 50,000,000	$ 50,000,000	$ 530,000,000	$ 70,000,000	$ 70,000,000	$ 70,000,000	$ 70,000,000			$ 300,000,000
Face amount of debt instument																			300,000,000	350,000,000	350,000,000
Total Number of Interest Rate Derivatives Entered During the Period												6
Number of Interest Rate Derivatives Settled During the Period																							2
Notional amount of forward starting swap agreements																						250,000,000
Settlement of forward starting interest rate swaps	(672,000)	0																				700,000
Term of notes																				10 years
Hedged amount associated with potential issuance of long-term debt																		280,000,000
Derivative, term of contract	126 months
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net [Abstract]
Gross derivative assets	19,192,000		1,075,000
Gross derivative liabilities	(5,010,000)		(8,235,000)
Net derivative asset/(liability)	14,182,000		(7,160,000)
Amount of gain/(loss) recognized in OCI on derivative				(2,201,000)	(2,756,000)	19,659,000	(8,628,000)
Amount of previously recorded loss reclassified from accumulated OCI into interest expense				783,000	762,000	2,328,000	2,249,000
Loss to be reclassified from accumulated other comprehensive loss to interest expense over next twelve months	5,900,000
Assets needed for immediate settlement, aggregate fair value																	$ 5,100,000

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Fair Value Measurement of Financial Instruments (Tables)

9 Months Ended

Sep. 30, 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 well as its level within the GAAP fair value hierarchy, as of September 30, 2013 and December 31, 2012, respectively (in thousands):

	September 30, 2013					December 31, 2012
Financial Instrument	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy
Assets:
Cash and cash equivalents(1)	$	15,972	$	15,972	Level 1	$	12,957	$	12,957	Level 1
Tenant receivables, net(1)	$	31,006	$	31,006	Level 1	$	25,038	$	25,038	Level 1
Restricted cash and escrows(1)	$	385	$	385	Level 1	$	334	$	334	Level 1
Interest rate swap asset	$	19,192	$	19,192	Level 2	$	1,075	$	1,075	Level 2
Liabilities:
Accounts payable and accrued expenses(1)	$	22,229	$	22,229	Level 1	$	23,113	$	23,113	Level 1
Interest rate swap liability	$	5,010	$	5,010	Level 2	$	8,235	$	8,235	Level 2
Debt	$	1,823,175	$	1,836,413	Level 2	$	1,416,525	$	1,470,002	Level 2

⁽¹⁾  For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to their short-term maturity.

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Variable Interest Entities (Tables)

9 Months Ended

Sep. 30, 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 September 30, 2013 is as follows (net carrying amount in millions):

Entity	Piedmont’s % Ownership of Entity	Related Building	Consolidated/ Unconsolidated	Net Carrying Amount as of September 30, 2013			Net Carrying Amount as of December 31, 2012			Primary Beneficiary Considerations
1201 Eye Street NW Associates, LLC	49.5%	1201 Eye Street	Consolidated	$	(4.5	)	$	(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.
1225 Eye Street NW Associates, LLC	49.5%	1225 Eye Street	Consolidated	$	(0.4	)	$	(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.
Piedmont 500 W. Monroe Fee, LLC	100%	500 W. Monroe	Consolidated	$	228.0		$	194.0		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 Gateway One	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.
Medici Atlanta, LLC	100%	The Medici	Consolidated	$	14.5		$	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	$	22.1		$	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.

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Stock Based Compensation (Outstanding Employee Deferred Stock Awards) (Details) (USD $)	Sep. 30, 2013 Stock Awards [Member]	Dec. 31, 2012 Stock Awards [Member]	Sep. 30, 2013 Stock Awards, Granted April 5, 2011 [Member]	Apr. 05, 2011 Stock Awards, Granted April 5, 2011 [Member]		Sep. 30, 2013 Stock Awards 2, Granted April 5, 2011 [Member]		Apr. 05, 2011 Stock Awards 2, Granted April 5, 2011 [Member]		Sep. 30, 2013 Stock Awards 1, Granted April 4, 2012 [Member]	Apr. 04, 2012 Stock Awards 1, Granted April 4, 2012 [Member]		Sep. 30, 2013 Stock Awards 2, Granted April 4, 2012 [Member]		Apr. 04, 2012 Stock Awards 2, Granted April 4, 2012 [Member]		Sep. 30, 2013 Stock Awards, Granted April 2, 2013 [Member]	Apr. 02, 2013 Stock Awards, Granted April 2, 2013 [Member]		Sep. 30, 2013 Stock Awards 2, Granted April 2, 2013 [Member]		Apr. 02, 2013 Stock Awards 2, Granted April 2, 2013 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Shares Granted				116,116	[1]			0	[1]		191,786	[1]			0	[1]		146,679	[1]			0	[1]
Grant Date Fair Value	$ 18.64	$ 18.41		$ 19.40				$ 18.27			$ 17.53				$ 17.42			$ 19.47				$ 18.91
Of the shares granted, % vested			25.00%							25.00%							25.00%
Of the shares granted, % expected to vest in 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%
Unvested Shares	272,993	318,893	37,196			0	[2]			116,289			0	[2]			119,508			0	[2]

[1] Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through September 30, 2013.

[2] Estimated based on Piedmont's cumulative total stockholder return ("TSR") for the respective performance period through September 30, 2013. As of September 30, 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.

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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) (Minimum [Member])	9 Months Ended
	Sep. 30, 2013
Minimum [Member]
Income Tax For Real Estate Investment Trusts [Line Items]
Real estate investment trust status required taxable income distribution rate	90.00%

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Fair Value Measurement of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	$ 19,192		$ 1,075
Interest rate swap liability	5,010		8,235
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	15,972	[1]	12,957	[1]
Tenant receivables, net	31,006	[1]	25,038	[1]
Restricted cash and escrows	385	[1]	334	[1]
Interest rate swaps	19,192		1,075
Accounts payable and accrued expenses	22,229	[1]	23,113	[1]
Debt	1,823,175		1,416,525
Interest Rate Swap [Member] | Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability	5,010		8,235
Level 1 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	15,972	[1]	12,957	[1]
Tenant receivables, net	31,006	[1]	25,038	[1]
Restricted cash and escrows	385	[1]	334	[1]
Accounts payable and accrued expenses	22,229	[1]	23,113	[1]
Level 2 [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	19,192		1,075
Debt	1,836,413		1,470,002
Level 2 [Member] | Interest Rate Swap [Member] | Estimated Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swap liability	$ 5,010		$ 8,235

[1] For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to their short-term maturity.

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Guarantor and Non-Guarantor Financial Information - Condensed Consolidated Balance Sheets (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Dec. 31, 2011
Assets:
Land	$ 675,281	$ 627,351
Buildings and improvements, less accumulated depreciation	3,049,905	2,891,323
Intangible lease assets, less accumulated amortization	66,870	54,744
Construction in progress	61,162	20,373
Real estate assets held for sale, net	19,734	18,941
Total real estate assets	3,872,952	3,612,732
Investments in and amounts due from unconsolidated joint ventures	18,668	37,689
Cash and cash equivalents	15,972	12,957	20,763	139,690
Tenant and straight-line rent receivables, net	166,493	146,544
Advances to affiliates	0	0
Investment in subsidiary	0	0
Notes receivable	0	0
Prepaid expenses, restricted cash, escrows, and other assets	17,995	13,356
Goodwill	180,097	180,097
Interest rate swaps	19,192	1,075
Deferred financing costs, net	7,990	6,454
Deferred lease costs, net	275,234	243,178
Other assets held for sale, net	1,960	793
Total assets	4,576,553	4,254,875
Liabilities:
Secured and unsecured debt	1,823,175	1,416,525
Accounts payable, accrued expenses, and accrued capital expenditures	159,675	127,263
Advances from affiliates	0	0
Deferred income	26,575	21,552
Intangible lease liabilities, net	41,435	40,805
Interest rate swaps	5,010	8,235
Total liabilities	2,055,870	1,614,380
Stockholders’ Equity:
Common stock	1,613	1,676
Additional paid-in capital	3,668,424	3,667,051
Cumulative distributions in excess of earnings	(1,165,794)	(1,022,681)
Other comprehensive income/(loss)	14,827	(7,160)
Piedmont stockholders’ equity	2,519,070	2,638,886
Noncontrolling interest	1,613	1,609
Total stockholders’ equity	2,520,683	2,640,495		2,773,428
Total liabilities and stockholders’ equity	4,576,553	4,254,875
Issuer [Member]
Assets:
Land	88,054	91,782
Buildings and improvements, less accumulated depreciation	492,098	511,793
Intangible lease assets, less accumulated amortization	2,547	3,265
Construction in progress	2,546	1,056
Real estate assets held for sale, net	19,734	18,941
Total real estate assets	604,979	626,837
Investments in and amounts due from unconsolidated joint ventures	18,668	37,689
Cash and cash equivalents	12,096	62,371	59,784	166,920
Tenant and straight-line rent receivables, net	35,914	33,495
Advances to affiliates	5,110,420	4,623,173
Investment in subsidiary	0	0
Notes receivable	160,000	160,000
Prepaid expenses, restricted cash, escrows, and other assets	5,671	4,218
Goodwill	180,097	180,097
Interest rate swaps	19,192	1,075
Deferred financing costs, net	6,703	4,292
Deferred lease costs, net	36,293	31,357
Other assets held for sale, net	1,960	793
Total assets	6,191,993	5,765,397
Liabilities:
Secured and unsecured debt	859,540	452,890
Accounts payable, accrued expenses, and accrued capital expenditures	20,937	20,443
Advances from affiliates	306,636	274,159
Deferred income	8,533	5,991
Intangible lease liabilities, net	6	24
Interest rate swaps	5,010	8,235
Total liabilities	1,200,662	761,742
Stockholders’ Equity:
Common stock	0	0
Additional paid-in capital	4,035,964	4,068,844
Cumulative distributions in excess of earnings	940,540	941,971
Other comprehensive income/(loss)	14,827	(7,160)
Piedmont stockholders’ equity	4,991,331	5,003,655
Noncontrolling interest	0	0
Total stockholders’ equity	4,991,331	5,003,655
Total liabilities and stockholders’ equity	6,191,993	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
Real estate assets held for sale, net	0	0
Total real estate assets	0	0
Investments in and amounts due from unconsolidated joint ventures	0	0
Cash and cash equivalents	146	238	150	139
Tenant and straight-line rent receivables, net	0	0
Advances to affiliates	1,293,461	1,300,158
Investment in subsidiary	4,035,964	4,068,844
Notes receivable	2,000	2,500
Prepaid expenses, restricted cash, escrows, and other assets	47	15
Goodwill	0	0
Interest rate swaps	0	0
Deferred financing costs, net	0	0
Deferred lease costs, net	0	0
Other assets held for sale, net	0	0
Total assets	5,331,618	5,371,755
Liabilities:
Secured and unsecured debt	0	0
Accounts payable, accrued expenses, and accrued capital expenditures	1,360	645
Advances from affiliates	4,807,113	4,636,936
Deferred income	0	0
Intangible lease liabilities, net	0	0
Interest rate swaps	0	0
Total liabilities	4,808,473	4,637,581
Stockholders’ Equity:
Common stock	1,613	1,676
Additional paid-in capital	3,668,424	3,667,051
Cumulative distributions in excess of earnings	(3,146,892)	(2,934,553)
Other comprehensive income/(loss)	0	0
Piedmont stockholders’ equity	523,145	734,174
Noncontrolling interest	0	0
Total stockholders’ equity	523,145	734,174
Total liabilities and stockholders’ equity	5,331,618	5,371,755
Non-Guarantor Subsidiaries [Member]
Assets:
Land	587,227	535,569
Buildings and improvements, less accumulated depreciation	2,558,107	2,379,530
Intangible lease assets, less accumulated amortization	64,323	51,479
Construction in progress	58,616	19,317
Real estate assets held for sale, net	0	0
Total real estate assets	3,268,273	2,985,895
Investments in and amounts due from unconsolidated joint ventures	0	0
Cash and cash equivalents	3,730	(49,652)	(39,171)	(27,369)
Tenant and straight-line rent receivables, net	130,579	113,049
Advances to affiliates	(1,086,177)	(908,506)
Investment in subsidiary	199	200
Notes receivable	23,890	23,890
Prepaid expenses, restricted cash, escrows, and other assets	13,218	10,071
Goodwill	0	0
Interest rate swaps	0	0
Deferred financing costs, net	1,287	2,162
Deferred lease costs, net	238,941	211,821
Other assets held for sale, net	0	0
Total assets	2,593,940	2,388,930
Liabilities:
Secured and unsecured debt	1,149,525	1,150,025
Accounts payable, accrued expenses, and accrued capital expenditures	138,319	107,123
Advances from affiliates	244,499	135,940
Deferred income	18,042	15,561
Intangible lease liabilities, net	41,429	40,781
Interest rate swaps	0	0
Total liabilities	1,591,814	1,449,430
Stockholders’ Equity:
Common stock	0	0
Additional paid-in capital	199	200
Cumulative distributions in excess of earnings	1,000,314	937,691
Other comprehensive income/(loss)	0	0
Piedmont stockholders’ equity	1,000,513	937,891
Noncontrolling interest	1,613	1,609
Total stockholders’ equity	1,002,126	939,500
Total liabilities and stockholders’ equity	2,593,940	2,388,930
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
Real estate assets held for sale, net	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 rent receivables, net	0	0
Advances to affiliates	(5,317,704)	(5,014,825)
Investment in subsidiary	(4,036,163)	(4,069,044)
Notes receivable	(185,890)	(186,390)
Prepaid expenses, restricted cash, escrows, and other assets	(941)	(948)
Goodwill	0	0
Interest rate swaps	0	0
Deferred financing costs, net	0	0
Deferred lease costs, net	0	0
Other assets held for sale, net	0	0
Total assets	(9,540,998)	(9,271,207)
Liabilities:
Secured and unsecured debt	(185,890)	(186,390)
Accounts payable, accrued expenses, and accrued capital expenditures	(941)	(948)
Advances from affiliates	(5,358,248)	(5,047,035)
Deferred income	0	0
Intangible lease liabilities, net	0
Interest rate swaps	0	0
Total liabilities	(5,545,079)	(5,234,373)
Stockholders’ Equity:
Common stock	0	0
Additional paid-in capital	(4,036,163)	(4,069,044)
Cumulative distributions in excess of earnings	40,244	32,210
Other comprehensive income/(loss)	0	0
Piedmont stockholders’ equity	(3,995,919)	(4,036,834)
Noncontrolling interest	0	0
Total stockholders’ equity	(3,995,919)	(4,036,834)
Total liabilities and stockholders’ equity	$ (9,540,998)	$ (9,271,207)

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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 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 income for the three and nine months endedSeptember 30, 2013 and 2012, respectively (in thousands):

	Three Months Ended		Nine Months Ended
	September 30, 2013	September 30, 2012	September 30, 2013	September 30, 2012
Weighted-average common shares – basic	164,683	168,806	166,598	171,162
Plus incremental weighted-average shares from time-vested conversions:
Restricted stock awards	113	123	136	133
Weighted-average common shares – diluted	164,796	168,929	166,734	171,295

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Discontinued Operations Discontinued Operations - Assets Held-for-Sale (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	$ 19,734	$ 18,941
Other assets held for sale, net	1,960	793
350 Spectrum Loop building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	19,734	18,941
Straight-line rent	1,018	793
Deferred lease costs, less accumulated amortization of $78 and $0 as of September 30, 2013 and December 31, 2012, respectively	942	0
Accumulated amortization on deferred lease costs	78	0
Other assets held for sale, net	1,960	793
Land [Member] | 350 Spectrum Loop building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	2,185	2,186
Building and improvements [Member] | 350 Spectrum Loop building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	16,332	16,755
Accumulated depreciation (building improvements)	6,737	6,313
Construction in progress [Member] | 350 Spectrum Loop building [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net	$ 1,217	$ 0

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Derivative Instruments (Tables)

9 Months Ended

Sep. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Notional Amounts of Outstanding Derivative Positions

A detail of Piedmont’s interest rate derivatives outstanding as of September 30, 2013 is as follows:

Interest Rate Derivative	Notional Amount (in millions)		Effective Date	Maturity Date
Interest rate swap	$	125	11/22/2011	11/22/2016
Interest rate swap	75		11/22/2011	11/22/2016
Interest rate swap	50		11/22/2011	11/22/2016
Interest rate swap	50		11/22/2011	11/22/2016
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Total	$	580

Schedule of Interest Rate Derivatives

A detail of Piedmont’s interest rate derivatives on a gross and net basis as of September 30, 2013 and December 31, 2012, respectively, is as follows (in thousands):

Interest rate swaps classified as:	September 30, 2013			December 31, 2012
Gross derivative assets	$	19,192		$	1,075
Gross derivative liabilities	(5,010		)	(8,235		)
Net derivative asset/(liability)	$	14,182		$	(7,160	)

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)

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 other comprehensive income ("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 three and nine months endedSeptember 30, 2013 and 2012, respectively, is as follows:

	Three Months Ended						Nine Months Ended
Derivative in Cash Flow Hedging Relationships (Interest Rate Swaps) (in thousands)	September 30, 2013			September 30, 2012			September 30, 2013		September 30, 2012
Amount of gain/(loss) recognized in OCI on derivative	$	(2,201	)	$	(2,756	)	$	19,659	$	(8,628	)
Amount of previously recorded loss reclassified from accumulated OCI into interest expense	$	783		$	762		$	2,328	$	2,249

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Consolidated Statements of Stockholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Cumulative Distributions in Excess of Earnings [Member]	Other Comprehensive Loss [Member]	Non-controlling Interest [Member]
Balance 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]
Shares repurchases as part of an announced plan	(88,737)	(52)		(88,685)
Shares repurchases as part of an announced plan (in shares)		(5,255,000)
Offering costs associated with the issuance of common stock	567		567
Dividends to common stockholders ($0.80 (YTD 2012) and $0.60 (YTD 2013) per share), distributions to noncontrolling interest, and dividends reinvested	(136,378)		(195)	(136,168)		(15)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	3,019	2	3,017
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		181,000
Net income attributable to noncontrolling interest	15					15
Net income attributable to Piedmont	93,204			93,204
Other comprehensive income (loss)	(4,623)				(4,623)
Balance 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]
Shares repurchases as part of an announced plan	(112,351)	(64)		(112,287)
Shares repurchases as part of an announced plan (in shares)		(6,433,000)
Offering costs associated with the issuance of common stock	(91)		(91)
Dividends to common stockholders ($0.80 (YTD 2012) and $0.60 (YTD 2013) per share), distributions to noncontrolling interest, and dividends reinvested	(100,102)		(163)	(99,931)		(8)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		148,000
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	1,628	1	1,627
Net income attributable to noncontrolling interest	12					12
Net income attributable to Piedmont	69,105			69,105
Other comprehensive income (loss)	21,987				21,987
Balance at Sep. 30, 2013	$ 2,520,683	$ 1,613	$ 3,668,424	$ (1,165,794)	$ 14,827	$ 1,613
Balance (in shares) at Sep. 30, 2013	161,270,766	161,271,000

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash Flows from Operating Activities:
Net income	$ 69,117	$ 78,778
Operating distributions received from unconsolidated joint ventures	1,475	1,805
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	91,376	84,100
Amortization of deferred financing costs	1,931	2,056
Settlement of forward starting interest rate swaps	672	0
Other amortization	34,384	38,895
Impairment loss on real estate assets	6,402	0
Stock compensation expense	1,489	1,492
Equity in income of unconsolidated joint ventures	(604)	(740)
Gain on sale of real estate assets, net	(16,258)	(27,583)
Loss on consolidation	(898)	0
Changes in assets and liabilities:
Increase in tenant receivables, net	(24,257)	(15,358)
Increase in restricted cash and escrows	(51)	(13,813)
Increase in prepaid expenses and other assets	(4,539)	(3,335)
Increase/(decrease) in accounts payable and accrued expenses	1,291	(483)
Increase/(decrease) in deferred income	5,022	(3,211)
Net cash provided by operating activities	168,348	142,603
Cash Flows from Investing Activities:
Acquisition of real estate assets and related intangibles	(250,127)	(2,500)
Capitalized expenditures, net of accruals	(112,486)	(71,936)
Acquisition of unconsolidated joint ventures, net of cash assumed	(14,242)	0
Net sales proceeds from wholly-owned properties	49,326	74,845
Investments in unconsolidated joint ventures	(793)	0
Deferred lease costs paid	(28,349)	(39,319)
Net cash used in investing activities	(356,671)	(38,910)
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,447)	(2,991)
Proceeds from debt	832,603	365,000
Repayments of debt	(426,000)	(401,500)
Costs of issuance of common stock	(91)	(229)
Repurchases of common stock as part of announced plan	(111,625)	(80,130)
Dividends paid and discount on dividend reinvestments	(100,102)	(102,770)
Net cash provided by/(used in) financing activities	191,338	(222,620)
Net increase/(decrease) in cash and cash equivalents	3,015	(118,927)
Cash and cash equivalents, beginning of period	12,957	139,690
Cash and cash equivalents, end of period	15,972	20,763
Supplemental Disclosures of Significant Noncash Investing and Financing Activities:
Change in accrued share repurchases as part of an announced plan	726	0
Accrued capital expenditures and deferred lease costs	38,837	11,177
Accrued deferred financing costs	$ 0	$ 110

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Acquisitions

9 Months Ended

Sep. 30, 2013

Business Combinations [Abstract]

Acquisitions

Acquisitions

During the nine months endedSeptember 30, 2013, Piedmont acquired the following properties:

Property		Metropolitan Statistical Area	Date of Acquisition	Rentable Square Feet	Percentage Leased as of Acquisition			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	89		%	$	4.3	(2)
5301 Maryland Way	(1)	Nashville, TN	August 12, 2013	201,237	100		%	$	18.5	(2)
4685 Investment Drive	(1)	Detroit, MI	August 12, 2013	77,045	100		%	$	10.0	(2)
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.

⁽²⁾ Purchase price represents the estimated fair value of the respective property which 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 three months ended September 30, 2013.

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Organization

9 Months Ended

Sep. 30, 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 June of 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 September 30, 2013, Piedmont owned interests in 77 consolidated office properties, plus two buildings owned through an unconsolidated joint venture. Our 77 consolidated office properties are located in 18 metropolitan areas across the United States. These office properties comprise approximately 21.1 million square feet of primarily Class A commercial office space, and were approximately 86.7% leased as of September 30, 2013.

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Commitments and Contingencies (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Loss Contingencies [Line Items]
Letter of credit, renewal period			1 year
Letter of Credit 1, July 2013 [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding	$ 7,696,547.95		$ 7,696,547.95
Letter of Credit 2, July 2013 [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding	9,033,164		9,033,164
Letter of Credit 3, July 2013 [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding	382,556		382,556
Tenant Audits and Disputes [Member]
Loss Contingencies [Line Items]
Tenant audit dispute expense	500,000	200,000	600,000	200,000
Unsecured Debt [Member] | $500 Million Unsecured Line of Credit [Member]
Loss Contingencies [Line Items]
Face amount of debt instument	500,000,000		500,000,000
Non-Incremental Capital Expenditures [Member]
Loss Contingencies [Line Items]
Potential obligations for tenant improvements	93,700,000		93,700,000
Incremental Capital Expenditures [Member]
Loss Contingencies [Line Items]
Potential obligations for tenant improvements	$ 23,600,000		$ 23,600,000

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Schedule of Letters of Credit

As of September 30, 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)
$	7,696,548	July 2014
$	9,033,164	July 2014
$	382,556	July 2014

⁽¹⁾  These letter of credit agreements automatically renew for consecutive, one-year periods each anniversary, subject to the satisfaction of the credit obligation and certain other limitations.

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Guarantor and Non-Guarantor Financial Information (Tables)

9 Months Ended

Sep. 30, 2013

Guarantor and Non-Guarantor Financial Information [Abstract]

Condensed Consolidated Balance Sheets

Condensed Consolidated Balance Sheets
As of September 30, 2013
(in thousands)	Issuer		Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Assets:
Real estate assets, at cost:
Land	$	88,054	$	—		$	587,227		$	—		$	675,281
Buildings and improvements, less accumulated depreciation	492,098		—			2,558,107			(300		)	3,049,905
Intangible lease assets, less accumulated amortization	2,547		—			64,323			—			66,870
Construction in progress	2,546		—			58,616			—			61,162
Real estate assets held for sale, net	19,734		—			—			—			19,734
Total real estate assets	604,979		—			3,268,273			(300		)	3,872,952
Investments in and amounts due from unconsolidated joint ventures	18,668		—			—			—			18,668
Cash and cash equivalents	12,096		146			3,730			—			15,972
Tenant and straight-line rent receivables, net	35,914		—			130,579			—			166,493
Advances to affiliates	5,110,420		1,293,461			(1,086,177		)	(5,317,704		)	—
Investment in subsidiary	—		4,035,964			199			(4,036,163		)	—
Notes receivable	160,000		2,000			23,890			(185,890		)	—
Prepaid expenses, restricted cash, escrows, and other assets	5,671		47			13,218			(941		)	17,995
Goodwill	180,097		—			—			—			180,097
Interest rate swaps	19,192		—			—			—			19,192
Deferred financing costs, net	6,703		—			1,287			—			7,990
Deferred lease costs, net	36,293		—			238,941			—			275,234
Other assets held for sale, net	1,960		—			—			—			1,960
Total assets	$	6,191,993	$	5,331,618		$	2,593,940		$	(9,540,998	)	$	4,576,553
Liabilities:
Secured and unsecured debt	$	859,540	$	—		$	1,149,525		$	(185,890	)	$	1,823,175
Accounts payable, accrued expenses, and accrued capital expenditures	20,937		1,360			138,319			(941		)	159,675
Advances from affiliates	306,636		4,807,113			244,499			(5,358,248		)	—
Deferred income	8,533		—			18,042			—			26,575
Intangible lease liabilities, net	6		—			41,429			—			41,435
Interest rate swaps	5,010		—			—			—			5,010
Total liabilities	1,200,662		4,808,473			1,591,814			(5,545,079		)	2,055,870
Stockholders’ Equity:
Common stock	—		1,613			—			—			1,613
Additional paid-in capital	4,035,964		3,668,424			199			(4,036,163		)	3,668,424
Retained/(cumulative distributions in excess of) earnings	940,540		(3,146,892		)	1,000,314			40,244			(1,165,794		)
Other comprehensive loss	14,827		—			—			—			14,827
Piedmont stockholders’ equity	4,991,331		523,145			1,000,513			(3,995,919		)	2,519,070
Noncontrolling interest	—		—			1,613			—			1,613
Total stockholders’ equity	4,991,331		523,145			1,002,126			(3,995,919		)	2,520,683
Total liabilities and stockholders’ equity	$	6,191,993	$	5,331,618		$	2,593,940		$	(9,540,998	)	$	4,576,553

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	$	91,782		$	—		$	535,569		$	—		$	627,351
Buildings and improvements, less accumulated depreciation	511,793			—			2,379,530			—			2,891,323
Intangible lease assets, less accumulated amortization	3,265			—			51,479			—			54,744
Construction in progress	1,056			—			19,317			—			20,373
Real estate assets held for sale, net	18,941			—			—			—			18,941
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			238			(49,652		)	—			12,957
Tenant receivables, net	33,495			—			113,049			—			146,544
Advances to affiliates	4,623,173			1,300,158			(908,506		)	(5,014,825		)	—
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	4,218			15			10,071			(948		)	13,356
Goodwill	180,097			—			—			—			180,097
Interest rate swaps	1,075			—			—			—			1,075
Deferred financing costs, net	4,292			—			2,162			—			6,454
Deferred lease costs, net	31,357			—			211,821			—			243,178
Other assets held for sale, net	793			—			—			—			793
Total assets	$	5,765,397		$	5,371,755		$	2,388,930		$	(9,271,207	)	$	4,254,875
Liabilities:
Secured and unsecured 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			135,940			(5,047,035		)	—
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			1,449,430			(5,234,373		)	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
Retained/(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		$	2,388,930		$	(9,271,207	)	$	4,254,875

Condensed Consolidated Statements of Income

Condensed Consolidated Statements of Income
For the three months ended September 30, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	20,700		$	—		$	97,492		$	(1,382	)	$	116,810
Tenant reimbursements	4,035			—			23,452			(69		)	27,418
Property management fee revenue	—			—			4,003			(3,113		)	890
	24,735			—			124,947			(4,564		)	145,118
Expenses:
Property operating costs	10,939			—			52,597			(4,769		)	58,767
Depreciation	6,068			—			24,717			—			30,785
Amortization	1,353			—			12,525			—			13,878
General and administrative	5,624			64			6,469			(6,316		)	5,841
	23,984			64			96,308			(11,085		)	109,271
Real estate operating income/(loss)	751			(64		)	28,639			6,521			35,847
Other income (expense):
Interest expense	(6,444		)	—			(16,028		)	3,141			(19,331		)
Interest and other income/(expense)	2,262			42			226			(3,141		)	(611		)
Net casualty (loss)/recoveries	(85		)	—			4,004			—			3,919
Equity in income of unconsolidated joint ventures	46			—			—			—			46
Loss on consolidation	(898		)	—			—			—			(898		)
	(5,119		)	42			(11,798		)	—			(16,875		)
Income/(loss) from continuing operations	(4,368		)	(22		)	16,841			6,521			18,972
Discontinued operations:
Operating income/(loss)	131			—			(3		)	—			128
Income/(loss) from discontinued operations	131			—			(3		)	—			128
Net income/(loss)	(4,237		)	(22		)	16,838			6,521			19,100
Less: Net income attributable to noncontrolling interest	—			—			(4		)	—			(4		)
Net income/(loss) attributable to Piedmont	$	(4,237	)	$	(22	)	$	16,834		$	6,521		$	19,096

Condensed Consolidated Statements of Income
For the three months ended September 30, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	18,889		$	—		$	87,448		$	(1,389	)	$	104,948
Tenant reimbursements	4,655			—			22,547			(70		)	27,132
Property management fee revenue	—			—			3,634			(3,114		)	520
	23,544			—			113,629			(4,573		)	132,600
Expenses:
Property operating costs	11,279			—			44,006			(4,802		)	50,483
Depreciation	6,200			—			21,721			—			27,921
Amortization	1,378			—			13,787			—			15,165
General and administrative	4,895			84			6,503			(5,974		)	5,508
	23,752			84			86,017			(10,776		)	99,077
Real estate operating income/(loss)	(208		)	(84		)	27,612			6,203			33,523
Other income (expense):
Interest expense	(3,360		)	—			(16,041		)	3,154			(16,247		)
Interest and other income/(expense)	3,245			—			292			(3,154		)	383
Litigation settlement expense	(7,500		)	—			—			—			(7,500		)
Equity in income of unconsolidated joint ventures	323			—			—			—			323
	(7,292		)	—			(15,749		)	—			(23,041		)
Income/(loss) from continuing operations	(7,500		)	(84		)	11,863			6,203			10,482
Discontinued operations:
Operating income	509			—			98			—			607
Loss on sale of real estate assets	(254		)	—			—			—			(254		)
Income from discontinued operations	255			—			98			—			353
Net income/(loss)	(7,245		)	(84		)	11,961			6,203			10,835
Less: Net income attributable to noncontrolling interest	—			—			(4		)	—			(4		)
Net income/(loss) attributable to Piedmont	$	(7,245	)	$	(84	)	$	11,957		$	6,203		$	10,831

Condensed Consolidated Statements of Income
For the nine months ended September 30, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	57,754		$	—		$	279,931		$	(3,830	)	$	333,855
Tenant reimbursements	12,018			—			65,357			(207		)	77,168
Property management fee revenue	—			—			11,392			(9,358		)	2,034
	69,772			—			356,680			(13,395		)	413,057
Expenses:
Property operating costs	31,107			—			147,014			(13,701		)	164,420
Depreciation	18,074			—			72,614			—			90,688
Amortization	3,926			—			30,318			—			34,244
General and administrative	16,024			249			18,896			(18,491		)	16,678
	69,131			249			268,842			(32,192		)	306,030
Real estate operating income/(loss)	641			(249		)	87,838			18,797			107,027
Other income (expense):
Interest expense	(15,478		)	—			(47,879		)	9,425			(53,932		)
Interest and other income/(expense)	7,834			128			(497		)	(9,425		)	(1,960		)
Litigation settlement recovery	1,250			—			—			—			1,250
Net casualty (loss)/recoveries	(239		)	—			6,300			—			6,061
Equity in income of unconsolidated joint ventures	604			—			—			—			604
Loss on consolidation	(898		)	—			—			—			(898		)
	(6,927		)	128			(42,076		)	—			(48,875		)
Income/(loss) from continuing operations	(6,286		)	(121		)	45,762			18,797			58,152
Discontinued operations:
Operating income, excluding impairment loss	503			—			606						1,109
Impairment loss	(6,402		)	—			—			—			(6,402		)
Gain/(loss) on sale of real estate assets	(9		)	—			16,267			—			16,258
Income/(loss) from discontinued operations	(5,908		)	—			16,873			—			10,965
Net income/(loss)	(12,194		)	(121		)	62,635			18,797			69,117
Less: Net income attributable to noncontrolling interest	—			—			(12		)	—			(12		)
Net income/(loss) attributable to Piedmont	$	(12,194	)	$	(121	)	$	62,623		$	18,797		$	69,105

Condensed Consolidated Statements of Income
For the nine months ended September 30, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	55,272		$	—		$	260,287		$	(3,552	)	$	312,007
Tenant reimbursements	12,774			—			67,727			(211		)	80,290
Property management fee revenue	—			—			10,705			(8,985		)	1,720
	68,046			—			338,719			(12,748		)	394,017
Expenses:
Property operating costs	31,416			—			136,444			(13,292		)	154,568
Depreciation	17,439			—			64,282			—			81,721
Amortization	3,981			—			35,114			—			39,095
General and administrative	14,930			224			18,057			(17,582		)	15,629
	67,766			224			253,897			(30,874		)	291,013
Real estate operating income/(loss)	280			(224		)	84,822			18,126			103,004
Other income (expense):
Interest expense	(9,120		)	—			(48,965		)	9,358			(48,727		)
Interest and other income/(expense)	9,268			—			855			(9,358		)	765
Litigation settlement expense	(7,500		)	—			—			—			(7,500		)
Equity in income of unconsolidated joint ventures	739			—			—			—			739
	(6,613		)	—			(48,110		)	—			(54,723		)
Income/(loss) from continuing operations	(6,333		)	(224		)	36,712			18,126			48,281
Discontinued operations:
Operating income	2,795			—			119			—			2,914
Gain on sale of real estate assets	27,582			—			1			—			27,583
Income from discontinued operations	30,377			—			120			—			30,497
Net income/(loss)	24,044			(224		)	36,832			18,126			78,778
Less: Net income attributable to noncontrolling interest	—			—			(12		)	—			(12		)
Net income/(loss) attributable to Piedmont	$	24,044		$	(224	)	$	36,820		$	18,126		$	78,766

Condensed Consolidated Statements of Cash Flows

Condensed Consolidated Statements of Cash Flows
For the nine months ended September 30, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net Cash Provided by Operating Activities	$	18,325		$	1,363		$	129,863		$	18,797		$	168,348
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(5,858		)	—			(357,055		)	300			(362,613		)
Intercompany note receivable	—			500			—			(500		)	—
Assets assumed upon acquisition of joint ventures	18,045			—			(32,287		)	—			(14,242		)
Net sales proceeds from wholly-owned properties	3,752			—			45,574			—			49,326
Investments in unconsolidated joint ventures	(793		)	—			—			—			(793		)
Deferred lease costs paid	(10,015		)	—			(18,334		)	—			(28,349		)
Net cash (used in)/provided by investing activities	5,131			500			(362,102		)	(200		)	(356,671		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,447		)	—			—			—			(3,447		)
Proceeds from debt	832,603			—			—			—			832,603
Repayments of debt	(426,000		)	—			—			—			(426,000		)
Intercompany note payable	—			—			(500		)	500			—
Costs of issuance of common stock	—			(91		)	—			—			(91		)
Repurchases of common stock as part of announced plan	—			(111,625		)	—			—			(111,625		)
Distributions to/repayments from affiliates	(476,887		)	209,855			286,129			(19,097		)	—
Dividends paid and discount on dividend reinvestments	—			(100,094		)	(8		)	—			(100,102		)
Net cash provided by/(used in) financing activities	(73,731		)	(1,955		)	285,621			(18,597		)	191,338
Net increase/(decrease) in cash and cash equivalents	(50,275		)	(92		)	53,382			—			3,015
Cash and cash equivalents, beginning of period	62,371			238			(49,652		)	—			12,957
Cash and cash equivalents, end of period	$	12,096		$	146		$	3,730		$	—		$	15,972

Condensed Consolidated Statements of Cash Flows
For the nine months ended September 30, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net Cash Provided by Operating Activities	$	748		$	1,527		$	122,202		$	18,126		$	142,603
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(16,558		)	—			(57,878		)	—			(74,436		)
Intercompany note receivable	(3,100		)	—			—			3,100			—
Net sales proceeds from wholly-owned properties	74,845			—			—			—			74,845
Deferred lease costs paid	(2,837		)	—			(36,482		)	—			(39,319		)
Net cash provided by/(used in) investing activities	52,350			—			(94,360		)	3,100			(38,910		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(2,991		)	—			—			—			(2,991		)
Proceeds from debt	365,000			—			—			—			365,000
Repayments of debt	(216,500		)	—			(185,000		)	—			(401,500		)
Intercompany note payable	—			—			3,100			(3,100		)	—
Costs of issuance of common stock	—			(229		)	—			—			(229		)
Repurchases of common stock as part of announced plan	—			(80,130		)	—			—			(80,130		)
Distributions to/repayments from affiliates	(305,743		)	181,605			142,264			(18,126		)	—
Dividends paid and discount on dividend reinvestments	—			(102,762		)	(8		)	—			(102,770		)
Net cash used in financing activities	(160,234		)	(1,516		)	(39,644		)	(21,226		)	(222,620		)
Net (decrease)/increase in cash and cash equivalents	(107,136		)	11			(11,802		)	—			(118,927		)
Cash and cash equivalents, beginning of period	166,920			139			(27,369		)	—			139,690
Cash and cash equivalents, end of period	$	59,784		$	150		$	(39,171	)	$	—		$	20,763

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Debt (Details) (USD $)	Sep. 30, 2013		May 09, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Weighted Average Rate	4.04%	[1],[2]
Amount Outstanding	$ 1,823,175,000	[2]		$ 1,416,525,000	[2]
Secured Debt [Member]
Debt Instrument [Line Items]
Weighted Average Rate	5.17%	[1],[2]
Amount Outstanding	987,525,000	[2]		987,525,000	[2]
Unsecured Debt [Member]
Debt Instrument [Line Items]
Weighted Average Rate	2.71%	[1],[2]
Amount Outstanding	835,650,000	[2]		429,000,000	[2]
Mortgage Note $200 Million [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Rate	4.87%	[1]
Amount Outstanding	200,000,000			200,000,000
Face amount of debt instument	200,000,000
Mortgage Note $25 Million [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Rate	5.70%	[1]
Amount Outstanding	25,000,000			25,000,000
Face amount of debt instument	25,000,000
Secured Pooled Facility [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Rate	4.84%	[1],[3]
Amount Outstanding	350,000,000			350,000,000
Number of properties in collateralized pool	9
Face amount of debt instument	350,000,000
Fixed-Rate $105 Million Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Rate	5.29%	[1]
Amount Outstanding	105,000,000			105,000,000
Face amount of debt instument	105,000,000
Fixed-Rate $125 Million Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Rate	5.50%	[1],[4]
Amount Outstanding	125,000,000			125,000,000
Number of properties in collateralized pool	4
Face amount of debt instument	125,000,000
Fixed-Rate $42.5 Million Loan [Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Rate	5.70%	[1]
Amount Outstanding	42,525,000			42,525,000
Face amount of debt instument	42,500,000.0
WDC Mortgage Notes $140 Million[Member] | Secured Debt [Member]
Debt Instrument [Line Items]
Rate	5.76%	[1]
Amount Outstanding	140,000,000			140,000,000
Face amount of debt instument	140,000,000
$300 Million Unsecured Term Loan [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Amount Outstanding	300,000,000			300,000,000
Face amount of debt instument	300,000,000
Basis spread on variable rate	1.45%	[1],[5]
$500 Million Unsecured Line of Credit [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Line of credit, effective interest rate	1.36%	[1],[6]
Amount Outstanding	187,000,000			129,000,000
Face amount of debt instument	500,000,000
Borrowing capacity of line of credit	500,000,000
$500 Million Unsecured Line of Credit [Member] | Unsecured Debt [Member] | Minimum [Member]
Debt Instrument [Line Items]
LIBOR rate in effect	0.18%
$500 Million Unsecured Line of Credit [Member] | Unsecured Debt [Member] | Maximum [Member]
Debt Instrument [Line Items]
LIBOR rate in effect	0.19%
$350 Million Senior Notes [Member] | Senior Notes [Member]
Debt Instrument [Line Items]
Rate	3.40%	[1],[7]
Amount Outstanding	348,650,000			0
Face amount of debt instument	$ 350,000,000		$ 350,000,000
Effective interest rate	3.45%	[1]
Interest Rate Swap [Member] | $300 Million Unsecured Term Loan [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Effective interest rate	2.69%
LIBOR [Member] | $500 Million Unsecured Line of Credit [Member] | Unsecured Debt [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.175%

[1] All of Piedmont’s outstanding debt as of September 30, 2013 and December 31, 2012 is interest-only debt.

[2] Weighted average is based on contractual balance of outstanding debt and interest rates in the table as of September 30, 2013, except for the $350 Million Senior Notes, which were issued at a discount (see footnote 7 below).

[3] Nine property collateralized pool includes: 1200 Crown Colony Drive, Braker Pointe III, 2 Gatehall Drive, One and Two Independence Square, 2120 West End Avenue, 400 Bridgewater Crossing, 200 Bridgewater Crossing, and Fairway Center II.

[4] Four property collateralized pool includes 1430 Enclave Parkway, Windy Point I and II, and 1055 East Colorado Boulevard.

[5] The $300 Million Unsecured 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%.

[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 September 30, 2013) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of September 30, 2013 consisted of 30-day LIBOR draws ranging from 0.18% to 0.19% (subject to the additional spread mentioned above).

[7] 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%.

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Guarantor and Non-Guarantor Financial Information - Condensed Consolidated Statements of Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Revenues:
Rental income	$ 116,810	$ 104,948	$ 333,855	$ 312,007
Tenant reimbursements	27,418	27,132	77,168	80,290
Property management fee revenue	890	520	2,034	1,720
Total revenues	145,118	132,600	413,057	394,017
Expenses:
Property operating costs	58,767	50,483	164,420	154,568
Depreciation	30,785	27,921	90,688	81,721
Amortization	13,878	15,165	34,244	39,095
General and administrative	5,841	5,508	16,678	15,629
Operating Expenses	109,271	99,077	306,030	291,013
Real estate operating income	35,847	33,523	107,027	103,004
Other income (expense):
Interest expense	(19,331)	(16,247)	(53,932)	(48,727)
Interest and other income/(expense)	(611)	383	(1,960)	765
Litigation settlement expense		(7,500)		(7,500)
Litigation settlement recovery/(expense)	0	(7,500)	1,250	(7,500)
Net recoveries of casualty loss	3,919	0	6,061	0
Equity in income of unconsolidated joint ventures	46	323	604	739
Loss on consolidation	(898)	0	(898)	0
Nonoperating Income (Expense)	(16,875)	(23,041)	(48,875)	(54,723)
Income from continuing operations	18,972	10,482	58,152	48,281
Discontinued operations:
Operating income	128	607	1,109	2,914
Impairment loss	0	0	(6,402)	0
Gain/(loss) on sale of real estate assets	0	(254)	16,258	27,583
Income from discontinued operations	128	353	10,965	30,497
Net income	19,100	10,835	69,117	78,778
Less: Net income attributable to noncontrolling interest	(4)	(4)	(12)	(12)
Net income attributable to Piedmont	19,096	10,831	69,105	78,766	93,204
Issuer [Member]
Revenues:
Rental income	20,700	18,889	57,754	55,272
Tenant reimbursements	4,035	4,655	12,018	12,774
Property management fee revenue	0	0	0	0
Total revenues	24,735	23,544	69,772	68,046
Expenses:
Property operating costs	10,939	11,279	31,107	31,416
Depreciation	6,068	6,200	18,074	17,439
Amortization	1,353	1,378	3,926	3,981
General and administrative	5,624	4,895	16,024	14,930
Operating Expenses	23,984	23,752	69,131	67,766
Real estate operating income	751	(208)	641	280
Other income (expense):
Interest expense	(6,444)	(3,360)	(15,478)	(9,120)
Interest and other income/(expense)	2,262	3,245	7,834	9,268
Litigation settlement expense		(7,500)		(7,500)
Litigation settlement recovery/(expense)			1,250
Net recoveries of casualty loss	(85)		(239)
Equity in income of unconsolidated joint ventures	46	323	604	739
Loss on consolidation	(898)		(898)
Nonoperating Income (Expense)	(5,119)	(7,292)	(6,927)	(6,613)
Income from continuing operations	(4,368)	(7,500)	(6,286)	(6,333)
Discontinued operations:
Operating income	131	509	503	2,795
Impairment loss			(6,402)
Gain/(loss) on sale of real estate assets		(254)	(9)	27,582
Income from discontinued operations	131	255	(5,908)	30,377
Net income	(4,237)	(7,245)	(12,194)	24,044
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to Piedmont	(4,237)	(7,245)	(12,194)	24,044
Guarantor [Member]
Revenues:
Rental income	0	0	0	0
Tenant reimbursements	0	0	0	0
Property management fee revenue	0	0	0	0
Total revenues	0	0	0	0
Expenses:
Property operating costs	0	0	0	0
Depreciation	0	0	0	0
Amortization	0	0	0	0
General and administrative	64	84	249	224
Operating Expenses	64	84	249	224
Real estate operating income	(64)	(84)	(249)	(224)
Other income (expense):
Interest expense	0	0	0	0
Interest and other income/(expense)	42	0	128	0
Litigation settlement expense		0		0
Litigation settlement recovery/(expense)			0
Net recoveries of casualty loss	0		0
Equity in income of unconsolidated joint ventures	0	0	0	0
Loss on consolidation	0		0
Nonoperating Income (Expense)	42	0	128	0
Income from continuing operations	(22)	(84)	(121)	(224)
Discontinued operations:
Operating income	0	0	0	0
Impairment loss			0
Gain/(loss) on sale of real estate assets		0	0	0
Income from discontinued operations	0	0	0	0
Net income	(22)	(84)	(121)	(224)
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to Piedmont	(22)	(84)	(121)	(224)
Non-Guarantor Subsidiaries [Member]
Revenues:
Rental income	97,492	87,448	279,931	260,287
Tenant reimbursements	23,452	22,547	65,357	67,727
Property management fee revenue	4,003	3,634	11,392	10,705
Total revenues	124,947	113,629	356,680	338,719
Expenses:
Property operating costs	52,597	44,006	147,014	136,444
Depreciation	24,717	21,721	72,614	64,282
Amortization	12,525	13,787	30,318	35,114
General and administrative	6,469	6,503	18,896	18,057
Operating Expenses	96,308	86,017	268,842	253,897
Real estate operating income	28,639	27,612	87,838	84,822
Other income (expense):
Interest expense	(16,028)	(16,041)	(47,879)	(48,965)
Interest and other income/(expense)	226	292	(497)	855
Litigation settlement expense		0		0
Litigation settlement recovery/(expense)			0
Net recoveries of casualty loss	4,004		6,300
Equity in income of unconsolidated joint ventures	0	0	0	0
Loss on consolidation	0		0
Nonoperating Income (Expense)	(11,798)	(15,749)	(42,076)	(48,110)
Income from continuing operations	16,841	11,863	45,762	36,712
Discontinued operations:
Operating income	(3)	98	606	119
Impairment loss			0
Gain/(loss) on sale of real estate assets		0	16,267	1
Income from discontinued operations	(3)	98	16,873	120
Net income	16,838	11,961	62,635	36,832
Less: Net income attributable to noncontrolling interest	(4)	(4)	(12)	(12)
Net income attributable to Piedmont	16,834	11,957	62,623	36,820
Eliminations [Member]
Revenues:
Rental income	(1,382)	(1,389)	(3,830)	(3,552)
Tenant reimbursements	(69)	(70)	(207)	(211)
Property management fee revenue	(3,113)	(3,114)	(9,358)	(8,985)
Total revenues	(4,564)	(4,573)	(13,395)	(12,748)
Expenses:
Property operating costs	(4,769)	(4,802)	(13,701)	(13,292)
Depreciation	0	0	0	0
Amortization	0	0	0	0
General and administrative	(6,316)	(5,974)	(18,491)	(17,582)
Operating Expenses	(11,085)	(10,776)	(32,192)	(30,874)
Real estate operating income	6,521	6,203	18,797	18,126
Other income (expense):
Interest expense	3,141	3,154	9,425	9,358
Interest and other income/(expense)	(3,141)	(3,154)	(9,425)	(9,358)
Litigation settlement expense		0		0
Litigation settlement recovery/(expense)			0
Net recoveries of casualty loss	0		0
Equity in income of unconsolidated joint ventures	0	0	0	0
Loss on consolidation	0		0
Nonoperating Income (Expense)	0	0	0	0
Income from continuing operations	6,521	6,203	18,797	18,126
Discontinued operations:
Operating income	0	0		0
Impairment loss			0
Gain/(loss) on sale of real estate assets		0	0	0
Income from discontinued operations	0	0	0	0
Net income	6,521	6,203	18,797	18,126
Less: Net income attributable to noncontrolling interest	0	0	0	0
Net income attributable to Piedmont	$ 6,521	$ 6,203	$ 18,797	$ 18,126

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Stock Based Compensation (Additional Information Regarding Stock Award Activity) (Details) (Stock Awards [Member], USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant Date Fair Value of Shares Granted During the Period	$ 0.00		$ 17.10		$ 19.47		$ 17.48
Total Grant Date Fair Value of Shares Vested During the Period	$ 28		$ 28		$ 3,867		$ 5,241
Share-based Liability Awards Paid During the Period	$ 0	[1]	$ 0	[1]	$ 103	[1]	$ 798	[1]

[1] Amounts reflect the issuance of performance share awards during the period.

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Consolidated Balance Sheets (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets:
Intangible lease assets, accumulated amortization	$ 70,744	$ 67,940
Tenant receivables, allowance for doubtful accounts	306	346
Deferred financing costs, accumulated amortization	12,365	10,479
Deferred lease costs, accumulated amortization	129,998	112,496
Liabilities:
Intangible lease liabilities, accumulated amortization	43,322	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 (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized	100,000,000	100,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized	750,000,000	750,000,000
Common stock, shares issued	161,270,766	167,556,001
Common stock, shares outstanding	161,270,766	167,556,001
Building and Building Improvements [Member]
Assets:
Buildings and improvements, accumulated depreciation	$ 955,480	$ 877,644

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Variable Interest Entities

9 Months Ended

Sep. 30, 2013

Variable Interest Entities [Abstract]

Variable Interest Entities

Variable Interest Entities

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 September 30, 2013 is as follows (net carrying amount in millions):

Entity	Piedmont’s % Ownership of Entity	Related Building	Consolidated/ Unconsolidated	Net Carrying Amount as of September 30, 2013			Net Carrying Amount as of December 31, 2012			Primary Beneficiary Considerations
1201 Eye Street NW Associates, LLC	49.5%	1201 Eye Street	Consolidated	$	(4.5	)	$	(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.
1225 Eye Street NW Associates, LLC	49.5%	1225 Eye Street	Consolidated	$	(0.4	)	$	(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.
Piedmont 500 W. Monroe Fee, LLC	100%	500 W. Monroe	Consolidated	$	228.0		$	194.0		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 Gateway One	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.
Medici Atlanta, LLC	100%	The Medici	Consolidated	$	14.5		$	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	$	22.1		$	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.

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Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net income attributable to Piedmont	$ 19,096	$ 10,831	$ 69,105	$ 78,766
Other comprehensive income/(loss):
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 5)	(2,201)	(2,756)	19,659	(8,628)
Plus: Reclassification of previously recorded loss included in net income (See Note 5)	783	762	2,328	2,249
Other comprehensive income/(loss)	(1,418)	(1,994)	21,987	(6,379)
Comprehensive income attributable to Piedmont	$ 17,678	$ 8,837	$ 91,092	$ 72,387

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets:
Land	$ 675,281	$ 627,351
Buildings and improvements, less accumulated depreciation of $955,480 and $877,644 as of September 30, 2013 and December 31, 2012, respectively	3,049,905	2,891,323
Intangible lease assets, less accumulated amortization of $70,744 and $67,940 as of September 30, 2013 and December 31, 2012, respectively	66,870	54,744
Construction in progress	61,162	20,373
Real estate assets held for sale, net	19,734	18,941
Total real estate assets	3,872,952	3,612,732
Investments in unconsolidated joint ventures	18,668	37,226
Cash and cash equivalents	15,972	12,957
Tenant receivables, net of allowance for doubtful accounts of $306 and $346 as of September 30, 2013 and December 31, 2012, respectively	31,006	25,038
Straight-line rent receivables	135,487	121,506
Due from unconsolidated joint ventures	0	463
Restricted cash and escrows	385	334
Prepaid expenses and other assets	17,610	13,022
Goodwill	180,097	180,097
Interest rate swaps	19,192	1,075
Deferred financing costs, less accumulated amortization of $12,365 and $10,479 as of September 30, 2013 and December 31, 2012, respectively	7,990	6,454
Deferred lease costs, less accumulated amortization of $129,998 and $112,496 as of September 30, 2013 and December 31, 2012, respectively	275,234	243,178
Other assets held for sale, net	1,960	793
Total assets	4,576,553	4,254,875
Liabilities:
Unsecured debt	835,650	429,000
Secured debt	987,525	987,525
Accounts payable, accrued expenses, and accrued capital expenditures	159,675	127,263
Deferred income	26,575	21,552
Intangible lease liabilities, less accumulated amortization of $43,322 and $40,931 as of September 30, 2013 and December 31, 2012, respectively	41,435	40,805
Interest rate swaps	5,010	8,235
Total liabilities	2,055,870	1,614,380
Commitments and Contingencies	0	0
Stockholders’ Equity:
Shares-in-trust, 150,000,000 shares authorized; none outstanding as of September 30, 2013 or December 31, 2012	0	0
Preferred stock, no par value, 100,000,000 shares authorized; none outstanding as of September 30, 2013 or December 31, 2012	0	0
Common stock, $.01 par value, 750,000,000 shares authorized; 161,270,766 and 167,556,001 shares issued and outstanding as of September 30, 2013 and December 31, 2012, respectively	1,613	1,676
Additional paid-in capital	3,668,424	3,667,051
Cumulative distributions in excess of earnings	(1,165,794)	(1,022,681)
Other comprehensive income/(loss)	14,827	(7,160)
Piedmont stockholders’ equity	2,519,070	2,638,886
Noncontrolling interest	1,613	1,609
Total stockholders’ equity	2,520,683	2,640,495
Total liabilities and stockholders’ equity	$ 4,576,553	$ 4,254,875

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Guarantor and Non-Guarantor Financial Information - Condensed Consolidated Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	$ 168,348	$ 142,603
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(362,613)	(74,436)
Intercompany note receivable	0	0
Acquisition of unconsolidated joint ventures, net of cash assumed	(14,242)	0
Net sales proceeds from wholly-owned properties	49,326	74,845
Investments in unconsolidated joint ventures	(793)	0
Deferred lease costs paid	(28,349)	(39,319)
Net cash used in investing activities	(356,671)	(38,910)
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,447)	(2,991)
Proceeds from debt	832,603	365,000
Repayments of debt	(426,000)	(401,500)
Intercompany note payable	0	0
Costs of issuance of common stock	(91)	(229)
Repurchases of common stock as part of announced plan	(111,625)	(80,130)
Distributions to/repayments from affiliates	0	0
Dividends paid and discount on dividend reinvestments	(100,102)	(102,770)
Net cash provided by/(used in) financing activities	191,338	(222,620)
Net increase/(decrease) in cash and cash equivalents	3,015	(118,927)
Cash and cash equivalents, beginning of period	12,957	139,690
Cash and cash equivalents, end of period	15,972	20,763
Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	18,325	748
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(5,858)	(16,558)
Intercompany note receivable	0	(3,100)
Acquisition of unconsolidated joint ventures, net of cash assumed	18,045
Net sales proceeds from wholly-owned properties	3,752	74,845
Investments in unconsolidated joint ventures	(793)
Deferred lease costs paid	(10,015)	(2,837)
Net cash used in investing activities	5,131	52,350
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,447)	(2,991)
Proceeds from debt	832,603	365,000
Repayments of debt	(426,000)	(216,500)
Intercompany note payable	0	0
Costs of issuance of common stock	0	0
Repurchases of common stock as part of announced plan	0	0
Distributions to/repayments from affiliates	(476,887)	(305,743)
Dividends paid and discount on dividend reinvestments	0	0
Net cash provided by/(used in) financing activities	(73,731)	(160,234)
Net increase/(decrease) in cash and cash equivalents	(50,275)	(107,136)
Cash and cash equivalents, beginning of period	62,371	166,920
Cash and cash equivalents, end of period	12,096	59,784
Guarantor [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	1,363	1,527
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	0	0
Intercompany note receivable	500	0
Acquisition of unconsolidated joint ventures, net of cash assumed	0
Net sales proceeds from wholly-owned properties	0	0
Investments in unconsolidated joint ventures	0
Deferred lease costs paid	0	0
Net cash used in investing activities	500	0
Cash Flows from Financing Activities:
Deferred financing costs paid	0	0
Proceeds from debt	0	0
Repayments of debt	0	0
Intercompany note payable	0	0
Costs of issuance of common stock	(91)	(229)
Repurchases of common stock as part of announced plan	(111,625)	(80,130)
Distributions to/repayments from affiliates	209,855	181,605
Dividends paid and discount on dividend reinvestments	(100,094)	(102,762)
Net cash provided by/(used in) financing activities	(1,955)	(1,516)
Net increase/(decrease) in cash and cash equivalents	(92)	11
Cash and cash equivalents, beginning of period	238	139
Cash and cash equivalents, end of period	146	150
Non-Guarantor Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	129,863	122,202
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(357,055)	(57,878)
Intercompany note receivable	0	0
Acquisition of unconsolidated joint ventures, net of cash assumed	(32,287)
Net sales proceeds from wholly-owned properties	45,574	0
Investments in unconsolidated joint ventures	0
Deferred lease costs paid	(18,334)	(36,482)
Net cash used in investing activities	(362,102)	(94,360)
Cash Flows from Financing Activities:
Deferred financing costs paid	0	0
Proceeds from debt	0	0
Repayments of debt	0	(185,000)
Intercompany note payable	(500)	3,100
Costs of issuance of common stock	0	0
Repurchases of common stock as part of announced plan	0	0
Distributions to/repayments from affiliates	286,129	142,264
Dividends paid and discount on dividend reinvestments	(8)	(8)
Net cash provided by/(used in) financing activities	285,621	(39,644)
Net increase/(decrease) in cash and cash equivalents	53,382	(11,802)
Cash and cash equivalents, beginning of period	(49,652)	(27,369)
Cash and cash equivalents, end of period	3,730	(39,171)
Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Net cash provided by operating activities	18,797	18,126
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	300	0
Intercompany note receivable	(500)	3,100
Acquisition of unconsolidated joint ventures, net of cash assumed	0
Net sales proceeds from wholly-owned properties	0	0
Investments in unconsolidated joint ventures	0
Deferred lease costs paid	0	0
Net cash used in investing activities	(200)	3,100
Cash Flows from Financing Activities:
Deferred financing costs paid	0	0
Proceeds from debt	0	0
Repayments of debt	0	0
Intercompany note payable	500	(3,100)
Costs of issuance of common stock	0	0
Repurchases of common stock as part of announced plan	0	0
Distributions to/repayments from affiliates	(19,097)	(18,126)
Dividends paid and discount on dividend reinvestments	0	0
Net cash provided by/(used in) financing activities	(18,597)	(21,226)
Net increase/(decrease) in cash and cash equivalents	0	0
Cash and cash equivalents, beginning of period	0	0
Cash and cash equivalents, end of period	$ 0	$ 0

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Discontinued Operations (Tables)

9 Months Ended

Sep. 30, 2013

Discontinued Operations and Disposal Groups [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(s) Sold	Location	Date of Sale	Gain/(Loss) on Sale			Net Sales Proceeds
Portland Portfolio(1)	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	$	16,267		$	45,574
350 Spectrum Loop(2)	Colorado Springs, Colorado	Held for Sale(2)	N/A			N/A

⁽¹⁾  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.

⁽²⁾  On September 30, 2013, Piedmont entered into a binding agreement to sell the 350 Spectrum Loop building with an expected close in November 2013, and in accordance with GAAP, Piedmont reclassified the building from real estate assets held-for-use to real estate assets held-for-sale on its consolidated balance sheet as of September 30, 2013. As such, Piedmont reclassified the operational results of the property as income from discontinued operations for prior periods to conform with current period presentation.

Disclosure of Long Lived Assets Held-for-sale

The details comprising assets held for sale, consisting solely of the 350 Spectrum Loop building, are presented below (in thousands):

	September 30, 2013		December 31, 2012
Real estate assets held for sale, net:
Land	$	2,185	$	2,186
Building and improvements, less accumulated depreciation of $6,737 and $6,313 as of September 30, 2013 and December 31, 2012, respectively	16,332		16,755
Construction in progress	1,217		—
Total real estate assets held for sale, net	$	19,734	$	18,941
Other assets held for sale:
Straight-line rent	$	1,018	$	793
Deferred lease costs, less accumulated amortization of $78 and $0 as of September 30, 2013 and December 31, 2012, respectively	942		—
Total other assets held for sale, net	$	1,960	$	793

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):

	Three Months Ended						Nine Months Ended
	September 30, 2013			September 30, 2012			September 30, 2013			September 30, 2012
Revenues:
Rental income	$	516		$	2,388		$	2,693		$	8,403
Tenant reimbursements	91			410			650			1,298
	607			2,798			3,343			9,701
Expenses:
Property operating costs	316			1,262			1,448			3,834
Depreciation	141			732			687			2,379
Amortization	21			159			138			527
General and administrative	—			38			2			47
	478			2,191			2,275			6,787
Other income (expense):
Interest and other income/(expense)	(1		)	—			24			—
Net recoveries of casualty loss	—			—			17			—
	(1		)	—			41			—
Operating income, excluding gain/(loss) on sale	128			607			1,109			2,914
Impairment loss	—			—			(6,402		)	—
Gain/(loss) on sale of real estate assets	—			(254		)	16,258			27,583
Income from discontinued operations	$	128		$	353		$	10,965		$	30,497

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Acquisitions (Tables)

9 Months Ended

Sep. 30, 2013

Business Combinations [Abstract]

Schedule of acquired properties

During the nine months endedSeptember 30, 2013, Piedmont acquired the following properties:

Property		Metropolitan Statistical Area	Date of Acquisition	Rentable Square Feet	Percentage Leased as of Acquisition			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	89		%	$	4.3	(2)
5301 Maryland Way	(1)	Nashville, TN	August 12, 2013	201,237	100		%	$	18.5	(2)
4685 Investment Drive	(1)	Detroit, MI	August 12, 2013	77,045	100		%	$	10.0	(2)
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.

⁽²⁾ Purchase price represents the estimated fair value of the respective property which 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 three months ended September 30, 2013.

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Stock Based Compensation (Rollforward of Deferred Stock Awards) (Details) (Stock Awards [Member], USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested Deferred Stock Awards, Beginning of period (in shares)			318,893
Deferred Stock Awards Granted (in shares)			161,257
Deferred Stock Awards Vested (in shares)			(204,295)
Deferred Stock Awards Forfeited (in shares)			(2,862)
Unvested Deferred Stock Awards, End of period (in shares)	272,993		272,993
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, Beginning of period (in dollars per share)			$ 18.41
Deferred Stock Awards Granted, Weighted-Average Grant Date Fair Value (in dollars per share)	$ 0.00	$ 17.10	$ 19.47	$ 17.48
Deferred Stock Awards Vested, Weighted-Average Grant Date Fair Value (in dollars per share)			$ 18.93
Deferred Stock Awards Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share)			$ 18.55
Unvested Deferred Stock Awards, Weighted-Average Grant Date Fair Value, End of period (in dollars per share)	$ 18.64		$ 18.64

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Variable Interest Entities (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 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	$ (4.5)	$ (5.7)
Variable interst entity, cash flow percent 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	(0.4)	(0.1)
Variable interst entity, cash flow percent 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	228.0	194.0
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	14.5	13.7
TownPark 400, LLC [Member]
Variable Interest Entity [Line Items]
Piedmont’s % Ownership of Entity	100.00%
Net Carrying Amount	$ 22.1	$ 23.5

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Acquisitions (Details) (USD $)	0 Months Ended	3 Months Ended		9 Months Ended
	Aug. 12, 2013 property Joint_Venture	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 04, 2013 Arlington Gateway [Member] sqft	Mar. 22, 2013 Wayside, 5 and 15 [Member] sqft	Aug. 12, 2013 20/20 [Member] sqft		Aug. 12, 2013 5301 Maryland Way [Member] sqft		Aug. 12, 2013 4685 Investment Drive [Member] sqft		Aug. 01, 2013 Royal Lane [Member] acre
Business Acquisition [Line Items]
Rentable Square Feet						333,948	271,434	68,376		201,237		77,045
Acreage														10.59
Number of real estate properties	3
Number of unconsolidated joint venture partnerships	2
Percentage Leased as of Acquisition						99.00%	95.00%	89.00%		100.00%		100.00%
Purchase Price						$ 175,600,000	$ 69,300,000	$ 4,300,000	[1]	$ 18,500	[1]	$ 10,000	[1]	$ 2,600,000
Amount purchased of remaining minority interest	14,700,000
Loss on consolidation		$ (898,000)	$ 0	$ (898,000)	$ 0

[1] Purchase price represents the estimated fair value of the respective property which 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 three months ended September 30, 2013.

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Debt (Narrative) (Details) (USD $)	0 Months Ended	3 Months Ended			9 Months Ended
	May 09, 2013	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Debt Instrument [Line Items]
Percentage ownership in operating partnership	100.00%				99.90%
Settlement of forward starting interest rate swaps					$ (672,000)		$ 0
Interest payments on debt facilities		15,500,000		15,700,000	47,300,000		47,100,000
Interest Costs Capitalized					0
Senior Notes [Member] | $350 Million Senior Notes [Member]
Debt Instrument [Line Items]
Face amount of debt instument	350,000,000	350,000,000			350,000,000
Rate		3.40%	[1],[2]		3.40%	[1],[2]
Proceeds from debt	348,600,000
Discount on notes payable	1,400,000
Term of notes	10 years
Senior Notes [Member] | $350 Million Senior Notes [Member] | Forward Starting Interest Rate Swap [Member]
Debt Instrument [Line Items]
Number of Interest Rate Derivatives Settled During the Period					2
Notional amount of forward starting swap agreements	250,000,000
Settlement of forward starting interest rate swaps	700,000
Senior Notes [Member] | $350 Million Senior Notes [Member] | Forward Starting Rate Swap 1 [Member]
Debt Instrument [Line Items]
Notional amount of forward starting swap agreements	220,000,000
Senior Notes [Member] | $350 Million Senior Notes [Member] | Forward Starting Rate Swap 2 [Member]
Debt Instrument [Line Items]
Notional amount of forward starting swap agreements	30,000,000
Unsecured Debt [Member] | $500 Million Unsecured Line of Credit [Member]
Debt Instrument [Line Items]
Face amount of debt instument		500,000,000			500,000,000
Net borrowings					484,000,000
Repayments					426,000,000
Borrowing capacity of line of credit		$ 500,000,000			$ 500,000,000

[1] 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%.

[2] All of Piedmont’s outstanding debt as of September 30, 2013 and December 31, 2012 is interest-only debt.

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Derivative Instruments

9 Months Ended

Sep. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

Risk Management Objective of Using Derivatives

In addition to operational risks which arise in the normal course of business, Piedmont is exposed to economic risks such as interest rate, liquidity, and credit risk. In certain situations, Piedmont has entered into derivative financial instruments such as interest rate swap agreements and other similar agreements to manage interest rate risk exposure arising from current or future variable rate debt transactions. Interest rate swap agreements involve the receipt or payment of future known and uncertain cash amounts, the value of which are determined by interest rates. Piedmont’s objective in using interest rate derivatives is to add stability to interest expense and to manage its exposure to interest rate movements.

Cash Flow Hedges of Interest Rate Risk

Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for Piedmont making fixed-rate payments over the life of the agreements without changing the underlying notional amount. During the nine months endedSeptember 30, 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.

Additionally, over the course of the twelve months ended September 30, 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 Senior Notes (see Note 4), 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 Senior Notes. 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 126 months.

A detail of Piedmont’s interest rate derivatives outstanding as of September 30, 2013 is as follows:

Interest Rate Derivative	Notional Amount (in millions)		Effective Date	Maturity Date
Interest rate swap	$	125	11/22/2011	11/22/2016
Interest rate swap	75		11/22/2011	11/22/2016
Interest rate swap	50		11/22/2011	11/22/2016
Interest rate swap	50		11/22/2011	11/22/2016
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Forward starting interest rate swap	70		3/3/2014	3/3/2024
Total	$	580

Piedmont has elected to present its interest rate derivatives on its consolidated balance sheets on a gross basis as interest rate swap asset and interest rate swap liabilities. A detail of Piedmont’s interest rate derivatives on a gross and net basis as of September 30, 2013 and December 31, 2012, respectively, is as follows (in thousands):

Interest rate swaps classified as:	September 30, 2013			December 31, 2012
Gross derivative assets	$	19,192		$	1,075
Gross derivative liabilities	(5,010		)	(8,235		)
Net derivative asset/(liability)	$	14,182		$	(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 other comprehensive income ("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 three and nine months endedSeptember 30, 2013 and 2012, respectively, is as follows:

	Three Months Ended						Nine Months Ended
Derivative in Cash Flow Hedging Relationships (Interest Rate Swaps) (in thousands)	September 30, 2013			September 30, 2012			September 30, 2013		September 30, 2012
Amount of gain/(loss) recognized in OCI on derivative	$	(2,201	)	$	(2,756	)	$	19,659	$	(8,628	)
Amount of previously recorded loss reclassified from accumulated OCI into interest expense	$	783		$	762		$	2,328	$	2,249

Piedmont estimates that approximately $5.9 million will be reclassified from accumulated other comprehensive loss 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 three and nine months endedSeptember 30, 2013 or 2012.

Additionally, see Note 7 for fair value disclosures of Piedmont's derivative instruments.

Credit-risk-related Contingent Features

Piedmont has agreements with its derivative counterparties that contain a provision whereby if Piedmont defaults on any of its indebtedness, including default where repayment of the indebtedness has not been accelerated by the lender, then Piedmont could also be declared in default on its derivative obligations. If Piedmont were to breach any of the contractual provisions of the derivative contracts, it would be required to settle its obligations under the agreements at their termination value of the fair values plus accrued interest, or approximately $5.1 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.

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Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2013

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

Schedule of Nonvested Share Activity

A rollforward of Piedmont's deferred stock award activity for the nine months endedSeptember 30, 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 Nine Months Ended September 30, 2013	161,257		$	19.47
Deferred Stock Awards Vested During Nine Months Ended September 30, 2013	(204,295	)	$	18.93
Deferred Stock Awards Forfeited During Nine Months Ended September 30, 2013	(2,862	)	$	18.55
Unvested Deferred Stock Awards as of September 30, 2013	272,993		$	18.64

The following table provides additional information regarding stock award activity during the three and nine months endedSeptember 30, 2013 and 2012, respectively (in thousands except for per share data):

	Three Months Ended				Nine Months Ended
	September 30, 2013		September 30, 2012		September 30, 2013		September 30, 2012
Weighted-Average Grant Date Fair Value of Shares Granted During the Period	$	—	$	17.10	$	19.47	$	17.48
Total Grant Date Fair Value of Shares Vested During the Period	$	28	$	28	$	3,867	$	5,241
Share-based Liability Awards Paid During the Period(1)	$	—	$	—	$	103	$	798

⁽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 September 30, 2013 is as follows:

Date of grant	Type of Award	Net Shares Granted (1)	Grant Date Fair Value		Vesting Schedule	Unvested Shares as of September 30, 2013
April 5, 2011	Annual Deferred Stock Award	116,116	$	19.40	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on April 5, 2012, 2013, and 2014, respectively.	37,196
April 5, 2011	Fiscal Year 2011-2013 Performance Share Program	—	$	18.27	Shares awarded, if any, will vest immediately upon determination of award in 2014.	—	(2)
April 4, 2012	Annual Deferred Stock Award	191,786	$	17.53	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 4, 2013, 2014, and 2015, respectively.	116,289
April 4, 2012	Fiscal Year 2012-2014 Performance Share Program	—	$	17.42	Shares awarded, if any, will vest immediately upon determination of award in 2015.	—	(2)
April 2, 2013	Annual Deferred Stock Award	146,679	$	19.47	Of the shares granted, 25% vested on the date of grant, and 25% will vest on April 2, 2014, 2015, and 2016, respectively.	119,508
April 2, 2013	Fiscal Year 2013-2015 Performance Share Program	—	$	18.91	Shares awarded, if any, will vest immediately upon determination of award in 2016.	—	(2)
Total						272,993

⁽¹⁾  Amounts reflect the total grant, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through September 30, 2013.

⁽²⁾  Estimated based on Piedmont's cumulative total stockholder return ("TSR") for the respective performance period through September 30, 2013. As of September 30, 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.

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Discontinued Operations (Details) (USD $)	3 Months Ended		9 Months Ended		0 Months Ended					3 Months Ended	0 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Mar. 19, 2012 Portland Portfolio [Member] property acre		May 31, 2012 26200 Enterprise Way [Member]	Sep. 21, 2012 110 & 112 Hidden Lake Circle Buildings [Member]	Mar. 28, 2013 1111 Durham Avenue [Member]	Mar. 31, 2013 1111 Durham Avenue [Member]	May 01, 2013 1200 Enclave Parkway [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain/(Loss) on Sale	$ 0	$ (254,000)	$ 16,258,000	$ 27,583,000	$ 17,823,000	[1]	$ 10,013,000	$ (259,000)	$ (9,000)		$ 16,267,000
Net Sales Proceeds			49,326,000	74,845,000	43,832,000	[1]	24,412,000	25,595,000	3,752,000		45,574,000
Number of Real Estate Properties Sold					4
Area of Land (in acres)					18.19
Impairment loss	0	0	(6,402,000)	0						(6,400,000)
Sale price									4,000,000
Revenues:
Rental income	516,000	2,388,000	2,693,000	8,403,000
Tenant reimbursements	91,000	410,000	650,000	1,298,000
Revenue	607,000	2,798,000	3,343,000	9,701,000
Expenses:
Property operating costs	316,000	1,262,000	1,448,000	3,834,000
Depreciation	141,000	732,000	687,000	2,379,000
Amortization	21,000	159,000	138,000	527,000
General and administrative	0	38,000	2,000	47,000
Expenses	478,000	2,191,000	2,275,000	6,787,000
Other income (expense):
Interest and other income/(expense)	(1,000)	0	24,000	0
Net recoveries of casualty loss	0	0	17,000	0
Other income (expense)	(1,000)	0	41,000	0
Operating income, excluding gain/(loss) on sale	128,000	607,000	1,109,000	2,914,000
Income from discontinued operations	$ 128,000	$ 353,000	$ 10,965,000	$ 30,497,000

[1] 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.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Commitments Under Existing Agreements

Certain lease agreements include provisions that, at the option of the tenant, may obligate Piedmont to provide funding for capital improvements. Under its existing lease agreements, Piedmont may be required to fund significant tenant improvements, leasing commissions, and building improvements. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for capital improvements or other financial obligations. Further, Piedmont classifies such tenant and building improvements into two classes: (i) improvements which incrementally enhance the building's asset value by expanding its revenue generating capacity (“incremental capital expenditures”) and (ii) improvements which maintain the building's existing asset value and its revenue generating capacity (“non-incremental capital expenditures”). As of September 30, 2013, Piedmont anticipates funding potential non-incremental capital expenditures for tenant improvements of approximately $93.7 million related to its existing lease portfolio over the respective lease terms, the majority of which Piedmont estimates may be required to be funded over the next several years. For most of Piedmont’s leases, the timing of the actual funding of these tenant improvements is largely dependent upon tenant requests for reimbursement. In some cases, these obligations may expire with the leases without further recourse to Piedmont.

Additionally, as of September 30, 2013, commitments for incremental capital expenditures for tenant improvements associated with new leases, primarily at value-add properties, totaled approximately $23.6 million.

Contingencies Related to Tenant Audits/Disputes

Certain lease agreements include provisions that grant tenants the right to engage independent auditors to audit their annual operating expense reconciliations. Such audits may result in the re-interpretation of language in the lease agreements which could result in the refund of previously recognized tenant reimbursement revenues, resulting in financial loss to Piedmont. Piedmont recorded additional expense related to such tenant audits/disputes of approximately $0.5 million and $0.2 million during the three months endedSeptember 30, 2013 and September 30, 2012, respectively, and approximately $0.6 million and $0.2 million for the nine months endedSeptember 30, 2013 and September 30, 2012, respectively.

Letters of Credit

As of September 30, 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)
$	7,696,548	July 2014
$	9,033,164	July 2014
$	382,556	July 2014

⁽¹⁾  These letter of credit agreements automatically renew for consecutive, one-year periods each anniversary, subject to the satisfaction of the credit obligation and certain other limitations.

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Debt

9 Months Ended

Sep. 30, 2013

Line of Credit and Notes Payable [Abstract]

Debt

Debt

On May 9, 2013, Piedmont, through its 100% owned operating partnership, Piedmont OP, issued $350 million in aggregate principal amount of 3.40% Senior Notes which mature on June 1, 2023 (the “Senior Notes”). The Senior Notes were originally offered in a private offering and subsequently exchanged for notes registered under the Securities Act of 1933, as amended. The Senior Notes are fully and unconditionally guaranteed on a senior unsecured basis by Piedmont.

Upon issuance of the Senior Notes, Piedmont OP received proceeds of approximately $348.6 million, reflecting a discount of approximately $1.4 million which is being amortized as interest expense under the effective interest method over the ten-year term of the Senior Notes. In addition, in conjunction with the issuance, Piedmont settled two forward starting rate swaps, consisting of notional amounts of $220 million and $30 million, respectively. The settlement of the swaps resulted in a gain of approximately $0.7 million that is being amortized as an offset to interest expense over the ten-year term of the Senior Notes. See Note 5 for further detail.

During the nine months endedSeptember 30, 2013, Piedmont incurred additional working capital borrowings of $484.0 million and, utilizing the proceeds of the Senior Notes issuance described above as well as other cash on hand, made repayments totaling $426.0 million on its $500 Million Unsecured Line of Credit. Piedmont also made interest payments on all debt facilities, including interest rate swap cash settlements, of approximately $15.5 million and $15.7 million for the three months endedSeptember 30, 2013 and 2012, respectively, and $47.3 million and $47.1 million for the nine months endedSeptember 30, 2013 and 2012, respectively. For the nine months endedSeptember 30, 2013 Piedmont had no capitalized interest.

See Note 7 for a description of Piedmont’s estimated fair value of debt as of September 30, 2013.

The following table summarizes the terms of Piedmont’s indebtedness outstanding as of September 30, 2013 and December 31, 2012 (in thousands):

Facility	Collateral	Rate(1)			Maturity	Amount Outstanding as of
						September 30, 2013		December 31, 2012
Secured (Fixed)
$200.0 Million Mortgage Note	Aon Center	4.87	%		5/1/2014	$	200,000	$	200,000
$25.0 Million Mortgage Note	Aon Center	5.70	%		5/1/2014	25,000		25,000
$350.0 Million Secured Pooled Facility	Nine Property Collateralized Pool (2)	4.84	%		6/7/2014	350,000		350,000
$105.0 Million Fixed-Rate Loan	US Bancorp Center	5.29	%		5/11/2015	105,000		105,000
$125.0 Million Fixed-Rate Loan	Four Property Collateralized Pool (3)	5.50	%		4/1/2016	125,000		125,000
$42.5 Million Fixed-Rate Loan	Las Colinas Corporate Center I & II	5.70	%		10/11/2016	42,525		42,525
$140.0 Million WDC Mortgage Notes	1201 & 1225 Eye Street	5.76	%		11/1/2017	140,000		140,000
Subtotal/Weighted Average (4)		5.17	%			987,525		987,525
Unsecured (Variable and Fixed)
$300 Million Unsecured Term Loan		LIBOR +  1.45%		(5)	11/22/2016	300,000		300,000
$500 Million Unsecured Line of Credit		1.36	%	(6)	8/19/2016	187,000		129,000
$350 Million Senior Notes		3.40	%	(7)	6/1/2023	348,650		—
Subtotal/Weighted Average (4)		2.71	%			835,650		429,000
Total/ Weighted Average (4)		4.04	%			$	1,823,175	$	1,416,525

⁽¹⁾  All of Piedmont’s outstanding debt as of September 30, 2013 and December 31, 2012 is interest-only debt.

⁽²⁾  Nine property collateralized pool includes: 1200 Crown Colony Drive, Braker Pointe III, 2 Gatehall Drive, One and Two Independence Square, 2120 West End Avenue, 400 Bridgewater Crossing, 200 Bridgewater Crossing, and Fairway Center II.

⁽³⁾  Four property collateralized pool includes 1430 Enclave Parkway, Windy Point I and II, and 1055 East Colorado Boulevard.

⁽⁴⁾  Weighted average is based on contractual balance of outstanding debt and interest rates in the table as of September 30, 2013, except for the $350 Million Senior Notes, which were issued at a discount (see footnote 7 below).

⁽⁵⁾  The $300 Million Unsecured 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%.

⁽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 September 30, 2013) over the selected rate based on Piedmont’s current credit rating. The outstanding balance as of September 30, 2013 consisted of 30-day LIBOR draws ranging from 0.18% to 0.19% (subject to the additional spread mentioned above).

⁽⁷⁾  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%.

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Consolidated Statements of Stockholders' Equity (Parenthetical) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012
Statement of Stockholders' Equity [Abstract]
Dividends to common stockholders (in dollars per share)	$ 0.60	$ 0.80

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Other Subsequent Events (Details) (Subsequent Event [Member], USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended
	Oct. 30, 2013
Subsequent Event [Member]
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.20
Amount authorized for stock repurchase plan	$ 150
Period for stock repurchase plan	2 years

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Stock Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to stock awards	$ 0.7	$ 0.9	$ 3.0	$ 3.1
Total shares issued to employees, directors, and officers			147,515
Unrecognized compensation cost related to nonvested	2.5		2.5
Unrecognized compensation cost related to nonvested, weighted-average vesting period (in years)			1 year
Amortization of Nonvested Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to stock awards			$ 1.8	$ 1.8
Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)			3 years
Period of predetermined peer group's total stockholder return			3 years

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Organization (Details)	0 Months Ended	9 Months Ended
	May 09, 2013	Sep. 30, 2013 subsidiary area	Aug. 12, 2013 property
Real Estate Properties [Line Items]
Number of wholly-owned subsidiaries		2
Percentage ownership by sole general partner	100.00%	99.90%
Percentage ownership by sole limited partner		0.10%
Number of real estate properties			3
Number of metropolitan areas		18
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		77
Square footage of real estate property		21,100,000
Percentage Leased as of Acquisition		86.70%

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Earnings Per Share

9 Months Ended

Sep. 30, 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 income for the three and nine months endedSeptember 30, 2013 and 2012, respectively (in thousands):

	Three Months Ended		Nine Months Ended
	September 30, 2013	September 30, 2012	September 30, 2013	September 30, 2012
Weighted-average common shares – basic	164,683	168,806	166,598	171,162
Plus incremental weighted-average shares from time-vested conversions:
Restricted stock awards	113	123	136	133
Weighted-average common shares – diluted	164,796	168,929	166,734	171,295

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Fair Value Measurement of Financial Instruments

9 Months Ended

Sep. 30, 2013

Fair Value Measurement of Financial Instruments [Abstract]

Fair Value Measurement of Financial Instruments

Fair Value Measurement of Financial Instruments

Piedmont considers its cash, accounts receivable, restricted cash and escrows, accounts payable and accrued expenses, interest rate swap agreements, and debt to meet the definition of financial instruments. The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of September 30, 2013 and December 31, 2012, respectively (in thousands):

	September 30, 2013					December 31, 2012
Financial Instrument	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy	Carrying Value		Estimated Fair Value		Level Within Fair Value Hierarchy
Assets:
Cash and cash equivalents(1)	$	15,972	$	15,972	Level 1	$	12,957	$	12,957	Level 1
Tenant receivables, net(1)	$	31,006	$	31,006	Level 1	$	25,038	$	25,038	Level 1
Restricted cash and escrows(1)	$	385	$	385	Level 1	$	334	$	334	Level 1
Interest rate swap asset	$	19,192	$	19,192	Level 2	$	1,075	$	1,075	Level 2
Liabilities:
Accounts payable and accrued expenses(1)	$	22,229	$	22,229	Level 1	$	23,113	$	23,113	Level 1
Interest rate swap liability	$	5,010	$	5,010	Level 2	$	8,235	$	8,235	Level 2
Debt	$	1,823,175	$	1,836,413	Level 2	$	1,416,525	$	1,470,002	Level 2

⁽¹⁾  For the periods presented, the carrying value of these financial instruments approximates estimated fair value due to their short-term maturity.

Piedmont's debt was carried at book value as of September 30, 2013 and December 31, 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 5, are classified as “Interest rate swap” assets and liabilities in the accompanying consolidated balance sheets and were carried at fair value as of September 30, 2013 and December 31, 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 September 30, 2013 and December 31, 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.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2013

Accounting Policies [Abstract]

Deferred Lease Costs

Deferred Lease Costs

Deferred lease costs are comprised of costs and incentives incurred to acquire operating leases, including intangible lease origination costs and direct payroll costs incurred related to negotiating and executing specific leases, and are capitalized and amortized on a straight-line basis over the terms of the related underlying leases. The amortization of deferred lease costs and intangibles is recorded as amortization expense in the accompanying consolidated statements of 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.

Revenue Recognition

Revenue Recognition

All leases of real estate assets held by Piedmont are classified as operating leases, and the related base rental income is recognized on a straight-line basis over the terms of the respective leases. Tenant reimbursements are recognized as revenue in the period that the related operating cost is incurred. Rents and tenant reimbursements collected in advance are recorded as deferred income in the accompanying consolidated balance sheets. Lease termination revenues are recognized ratably as rental revenue over the revised remaining lease term after giving effect to the termination notice. Contingent rental income recognition is deferred until the specific lease-related targets are achieved.

Gains on the sale of real estate assets are recognized upon completing the sale and, among other things, determining the sale price and transferring all of the risks and rewards of ownership without significant continuing involvement with the purchaser. Recognition of all or a portion of the gain would be deferred until both of these conditions are met. Losses are recognized through impairment charges when identified.

Income Taxes

Income Taxes

Piedmont has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended (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. Piedmont is subject to certain taxes related to the operations of properties in certain locations, as well as operations conducted by its taxable REIT subsidiary, POH, which have been provided for in the financial statements.

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Guarantor and Non-Guarantor Financial Information

9 Months Ended

Sep. 30, 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 September 30, 2013
(in thousands)	Issuer		Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Assets:
Real estate assets, at cost:
Land	$	88,054	$	—		$	587,227		$	—		$	675,281
Buildings and improvements, less accumulated depreciation	492,098		—			2,558,107			(300		)	3,049,905
Intangible lease assets, less accumulated amortization	2,547		—			64,323			—			66,870
Construction in progress	2,546		—			58,616			—			61,162
Real estate assets held for sale, net	19,734		—			—			—			19,734
Total real estate assets	604,979		—			3,268,273			(300		)	3,872,952
Investments in and amounts due from unconsolidated joint ventures	18,668		—			—			—			18,668
Cash and cash equivalents	12,096		146			3,730			—			15,972
Tenant and straight-line rent receivables, net	35,914		—			130,579			—			166,493
Advances to affiliates	5,110,420		1,293,461			(1,086,177		)	(5,317,704		)	—
Investment in subsidiary	—		4,035,964			199			(4,036,163		)	—
Notes receivable	160,000		2,000			23,890			(185,890		)	—
Prepaid expenses, restricted cash, escrows, and other assets	5,671		47			13,218			(941		)	17,995
Goodwill	180,097		—			—			—			180,097
Interest rate swaps	19,192		—			—			—			19,192
Deferred financing costs, net	6,703		—			1,287			—			7,990
Deferred lease costs, net	36,293		—			238,941			—			275,234
Other assets held for sale, net	1,960		—			—			—			1,960
Total assets	$	6,191,993	$	5,331,618		$	2,593,940		$	(9,540,998	)	$	4,576,553
Liabilities:
Secured and unsecured debt	$	859,540	$	—		$	1,149,525		$	(185,890	)	$	1,823,175
Accounts payable, accrued expenses, and accrued capital expenditures	20,937		1,360			138,319			(941		)	159,675
Advances from affiliates	306,636		4,807,113			244,499			(5,358,248		)	—
Deferred income	8,533		—			18,042			—			26,575
Intangible lease liabilities, net	6		—			41,429			—			41,435
Interest rate swaps	5,010		—			—			—			5,010
Total liabilities	1,200,662		4,808,473			1,591,814			(5,545,079		)	2,055,870
Stockholders’ Equity:
Common stock	—		1,613			—			—			1,613
Additional paid-in capital	4,035,964		3,668,424			199			(4,036,163		)	3,668,424
Retained/(cumulative distributions in excess of) earnings	940,540		(3,146,892		)	1,000,314			40,244			(1,165,794		)
Other comprehensive loss	14,827		—			—			—			14,827
Piedmont stockholders’ equity	4,991,331		523,145			1,000,513			(3,995,919		)	2,519,070
Noncontrolling interest	—		—			1,613			—			1,613
Total stockholders’ equity	4,991,331		523,145			1,002,126			(3,995,919		)	2,520,683
Total liabilities and stockholders’ equity	$	6,191,993	$	5,331,618		$	2,593,940		$	(9,540,998	)	$	4,576,553

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	$	91,782		$	—		$	535,569		$	—		$	627,351
Buildings and improvements, less accumulated depreciation	511,793			—			2,379,530			—			2,891,323
Intangible lease assets, less accumulated amortization	3,265			—			51,479			—			54,744
Construction in progress	1,056			—			19,317			—			20,373
Real estate assets held for sale, net	18,941			—			—			—			18,941
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			238			(49,652		)	—			12,957
Tenant receivables, net	33,495			—			113,049			—			146,544
Advances to affiliates	4,623,173			1,300,158			(908,506		)	(5,014,825		)	—
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	4,218			15			10,071			(948		)	13,356
Goodwill	180,097			—			—			—			180,097
Interest rate swaps	1,075			—			—			—			1,075
Deferred financing costs, net	4,292			—			2,162			—			6,454
Deferred lease costs, net	31,357			—			211,821			—			243,178
Other assets held for sale, net	793			—			—			—			793
Total assets	$	5,765,397		$	5,371,755		$	2,388,930		$	(9,271,207	)	$	4,254,875
Liabilities:
Secured and unsecured 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			135,940			(5,047,035		)	—
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			1,449,430			(5,234,373		)	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
Retained/(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		$	2,388,930		$	(9,271,207	)	$	4,254,875

Condensed Consolidated Statements of Income
For the three months ended September 30, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	20,700		$	—		$	97,492		$	(1,382	)	$	116,810
Tenant reimbursements	4,035			—			23,452			(69		)	27,418
Property management fee revenue	—			—			4,003			(3,113		)	890
	24,735			—			124,947			(4,564		)	145,118
Expenses:
Property operating costs	10,939			—			52,597			(4,769		)	58,767
Depreciation	6,068			—			24,717			—			30,785
Amortization	1,353			—			12,525			—			13,878
General and administrative	5,624			64			6,469			(6,316		)	5,841
	23,984			64			96,308			(11,085		)	109,271
Real estate operating income/(loss)	751			(64		)	28,639			6,521			35,847
Other income (expense):
Interest expense	(6,444		)	—			(16,028		)	3,141			(19,331		)
Interest and other income/(expense)	2,262			42			226			(3,141		)	(611		)
Net casualty (loss)/recoveries	(85		)	—			4,004			—			3,919
Equity in income of unconsolidated joint ventures	46			—			—			—			46
Loss on consolidation	(898		)	—			—			—			(898		)
	(5,119		)	42			(11,798		)	—			(16,875		)
Income/(loss) from continuing operations	(4,368		)	(22		)	16,841			6,521			18,972
Discontinued operations:
Operating income/(loss)	131			—			(3		)	—			128
Income/(loss) from discontinued operations	131			—			(3		)	—			128
Net income/(loss)	(4,237		)	(22		)	16,838			6,521			19,100
Less: Net income attributable to noncontrolling interest	—			—			(4		)	—			(4		)
Net income/(loss) attributable to Piedmont	$	(4,237	)	$	(22	)	$	16,834		$	6,521		$	19,096

Condensed Consolidated Statements of Income
For the three months ended September 30, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	18,889		$	—		$	87,448		$	(1,389	)	$	104,948
Tenant reimbursements	4,655			—			22,547			(70		)	27,132
Property management fee revenue	—			—			3,634			(3,114		)	520
	23,544			—			113,629			(4,573		)	132,600
Expenses:
Property operating costs	11,279			—			44,006			(4,802		)	50,483
Depreciation	6,200			—			21,721			—			27,921
Amortization	1,378			—			13,787			—			15,165
General and administrative	4,895			84			6,503			(5,974		)	5,508
	23,752			84			86,017			(10,776		)	99,077
Real estate operating income/(loss)	(208		)	(84		)	27,612			6,203			33,523
Other income (expense):
Interest expense	(3,360		)	—			(16,041		)	3,154			(16,247		)
Interest and other income/(expense)	3,245			—			292			(3,154		)	383
Litigation settlement expense	(7,500		)	—			—			—			(7,500		)
Equity in income of unconsolidated joint ventures	323			—			—			—			323
	(7,292		)	—			(15,749		)	—			(23,041		)
Income/(loss) from continuing operations	(7,500		)	(84		)	11,863			6,203			10,482
Discontinued operations:
Operating income	509			—			98			—			607
Loss on sale of real estate assets	(254		)	—			—			—			(254		)
Income from discontinued operations	255			—			98			—			353
Net income/(loss)	(7,245		)	(84		)	11,961			6,203			10,835
Less: Net income attributable to noncontrolling interest	—			—			(4		)	—			(4		)
Net income/(loss) attributable to Piedmont	$	(7,245	)	$	(84	)	$	11,957		$	6,203		$	10,831

Condensed Consolidated Statements of Income
For the nine months ended September 30, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	57,754		$	—		$	279,931		$	(3,830	)	$	333,855
Tenant reimbursements	12,018			—			65,357			(207		)	77,168
Property management fee revenue	—			—			11,392			(9,358		)	2,034
	69,772			—			356,680			(13,395		)	413,057
Expenses:
Property operating costs	31,107			—			147,014			(13,701		)	164,420
Depreciation	18,074			—			72,614			—			90,688
Amortization	3,926			—			30,318			—			34,244
General and administrative	16,024			249			18,896			(18,491		)	16,678
	69,131			249			268,842			(32,192		)	306,030
Real estate operating income/(loss)	641			(249		)	87,838			18,797			107,027
Other income (expense):
Interest expense	(15,478		)	—			(47,879		)	9,425			(53,932		)
Interest and other income/(expense)	7,834			128			(497		)	(9,425		)	(1,960		)
Litigation settlement recovery	1,250			—			—			—			1,250
Net casualty (loss)/recoveries	(239		)	—			6,300			—			6,061
Equity in income of unconsolidated joint ventures	604			—			—			—			604
Loss on consolidation	(898		)	—			—			—			(898		)
	(6,927		)	128			(42,076		)	—			(48,875		)
Income/(loss) from continuing operations	(6,286		)	(121		)	45,762			18,797			58,152
Discontinued operations:
Operating income, excluding impairment loss	503			—			606						1,109
Impairment loss	(6,402		)	—			—			—			(6,402		)
Gain/(loss) on sale of real estate assets	(9		)	—			16,267			—			16,258
Income/(loss) from discontinued operations	(5,908		)	—			16,873			—			10,965
Net income/(loss)	(12,194		)	(121		)	62,635			18,797			69,117
Less: Net income attributable to noncontrolling interest	—			—			(12		)	—			(12		)
Net income/(loss) attributable to Piedmont	$	(12,194	)	$	(121	)	$	62,623		$	18,797		$	69,105

Condensed Consolidated Statements of Income
For the nine months ended September 30, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Revenues:
Rental income	$	55,272		$	—		$	260,287		$	(3,552	)	$	312,007
Tenant reimbursements	12,774			—			67,727			(211		)	80,290
Property management fee revenue	—			—			10,705			(8,985		)	1,720
	68,046			—			338,719			(12,748		)	394,017
Expenses:
Property operating costs	31,416			—			136,444			(13,292		)	154,568
Depreciation	17,439			—			64,282			—			81,721
Amortization	3,981			—			35,114			—			39,095
General and administrative	14,930			224			18,057			(17,582		)	15,629
	67,766			224			253,897			(30,874		)	291,013
Real estate operating income/(loss)	280			(224		)	84,822			18,126			103,004
Other income (expense):
Interest expense	(9,120		)	—			(48,965		)	9,358			(48,727		)
Interest and other income/(expense)	9,268			—			855			(9,358		)	765
Litigation settlement expense	(7,500		)	—			—			—			(7,500		)
Equity in income of unconsolidated joint ventures	739			—			—			—			739
	(6,613		)	—			(48,110		)	—			(54,723		)
Income/(loss) from continuing operations	(6,333		)	(224		)	36,712			18,126			48,281
Discontinued operations:
Operating income	2,795			—			119			—			2,914
Gain on sale of real estate assets	27,582			—			1			—			27,583
Income from discontinued operations	30,377			—			120			—			30,497
Net income/(loss)	24,044			(224		)	36,832			18,126			78,778
Less: Net income attributable to noncontrolling interest	—			—			(12		)	—			(12		)
Net income/(loss) attributable to Piedmont	$	24,044		$	(224	)	$	36,820		$	18,126		$	78,766

Condensed Consolidated Statements of Cash Flows
For the nine months ended September 30, 2013
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net Cash Provided by Operating Activities	$	18,325		$	1,363		$	129,863		$	18,797		$	168,348
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(5,858		)	—			(357,055		)	300			(362,613		)
Intercompany note receivable	—			500			—			(500		)	—
Assets assumed upon acquisition of joint ventures	18,045			—			(32,287		)	—			(14,242		)
Net sales proceeds from wholly-owned properties	3,752			—			45,574			—			49,326
Investments in unconsolidated joint ventures	(793		)	—			—			—			(793		)
Deferred lease costs paid	(10,015		)	—			(18,334		)	—			(28,349		)
Net cash (used in)/provided by investing activities	5,131			500			(362,102		)	(200		)	(356,671		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(3,447		)	—			—			—			(3,447		)
Proceeds from debt	832,603			—			—			—			832,603
Repayments of debt	(426,000		)	—			—			—			(426,000		)
Intercompany note payable	—			—			(500		)	500			—
Costs of issuance of common stock	—			(91		)	—			—			(91		)
Repurchases of common stock as part of announced plan	—			(111,625		)	—			—			(111,625		)
Distributions to/repayments from affiliates	(476,887		)	209,855			286,129			(19,097		)	—
Dividends paid and discount on dividend reinvestments	—			(100,094		)	(8		)	—			(100,102		)
Net cash provided by/(used in) financing activities	(73,731		)	(1,955		)	285,621			(18,597		)	191,338
Net increase/(decrease) in cash and cash equivalents	(50,275		)	(92		)	53,382			—			3,015
Cash and cash equivalents, beginning of period	62,371			238			(49,652		)	—			12,957
Cash and cash equivalents, end of period	$	12,096		$	146		$	3,730		$	—		$	15,972

Condensed Consolidated Statements of Cash Flows
For the nine months ended September 30, 2012
(in thousands)	Issuer			Guarantor			Non-Guarantor Subsidiaries			Eliminations			Consolidated
Net Cash Provided by Operating Activities	$	748		$	1,527		$	122,202		$	18,126		$	142,603
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(16,558		)	—			(57,878		)	—			(74,436		)
Intercompany note receivable	(3,100		)	—			—			3,100			—
Net sales proceeds from wholly-owned properties	74,845			—			—			—			74,845
Deferred lease costs paid	(2,837		)	—			(36,482		)	—			(39,319		)
Net cash provided by/(used in) investing activities	52,350			—			(94,360		)	3,100			(38,910		)
Cash Flows from Financing Activities:
Deferred financing costs paid	(2,991		)	—			—			—			(2,991		)
Proceeds from debt	365,000			—			—			—			365,000
Repayments of debt	(216,500		)	—			(185,000		)	—			(401,500		)
Intercompany note payable	—			—			3,100			(3,100		)	—
Costs of issuance of common stock	—			(229		)	—			—			(229		)
Repurchases of common stock as part of announced plan	—			(80,130		)	—			—			(80,130		)
Distributions to/repayments from affiliates	(305,743		)	181,605			142,264			(18,126		)	—
Dividends paid and discount on dividend reinvestments	—			(102,762		)	(8		)	—			(102,770		)
Net cash used in financing activities	(160,234		)	(1,516		)	(39,644		)	(21,226		)	(222,620		)
Net (decrease)/increase in cash and cash equivalents	(107,136		)	11			(11,802		)	—			(118,927		)
Cash and cash equivalents, beginning of period	166,920			139			(27,369		)	—			139,690
Cash and cash equivalents, end of period	$	59,784		$	150		$	(39,171	)	$	—		$	20,763

XML

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 30, 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-Q
Document Period End Date	Sep. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity Common Stock, Shares Outstanding		161,112,966

XML

Other Subsequent Events

9 Months Ended

Sep. 30, 2013

Subsequent Events [Abstract]

Other Subsequent Events

Other Subsequent Events

Fourth Quarter Dividend Declaration

On October 30, 2013, the board of directors of Piedmont declared dividends for the fourth quarter of 2013 in the amount of $0.20 per common share outstanding to stockholders of record as of the close of business on November 29, 2013. Such dividends are to be paid on December 20, 2013.

Amendment and Restatement of Stock Repurchase Plan

Our current stock repurchase plan expires in November of 2013. On October 30, 2013, our board of directors amended and restated the plan to authorize $150 million in stock repurchases over the next two years. 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.