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 June 30, 2018

OR

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

For the Transition Period From To

Commission file number 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)

5565 Glenridge Connector

Ste. 450

Atlanta, Georgia 30342

(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, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and "emerging growth company" in Rule 12b-2 of the Exchange Act.

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

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. 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 July 31, 2018:

128,370,913 shares

FORM 10-Q

PIEDMONT OFFICE REALTY TRUST, INC.

TABLE OF CONTENTS

			Page No.
PART I.	Financial Statements
	Item 1.	Consolidated Financial Statements	5
		Consolidated Balance Sheets—June 30, 2018 (unaudited) and December 31, 2017	6
		Consolidated Statements of Income for the Three and Six Months Ended June 30, 2018 (unaudited) and 2017 (unaudited)	7
		Consolidated Statements of Comprehensive Income for the Three and Six Months Ended June 30, 2018 (unaudited) and 2017 (unaudited)	8
		Consolidated Statements of Stockholders' Equity for the Year Ended December 31, 2017 and for the Six Months Ended June 30, 2018 (unaudited)	9
		Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2018 (unaudited) and 2017 (unaudited)	10
		Condensed Notes to Consolidated Financial Statements (unaudited)	11
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	34
	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	50
	Item 6.	Exhibits	50

2

CAUTIONARY NOTE REGARDING FORWARD-LOOKING STATEMENTS

Certain statements contained in this Form 10-Q may constitute forward-looking statements within the meaning of the federal securities laws. In addition, Piedmont Office Realty Trust, Inc. ("Piedmont," "we," "our," or "us"), 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 other written or 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. 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 share repurchases; and discussions regarding the potential impact of economic conditions on our real estate and lease portfolio.

These statements are based on beliefs and assumptions of Piedmont’s management, which in turn are based on information available at the time the statements are made. Important assumptions relating to the forward-looking statements include, among others, assumptions regarding the demand for office space in the markets 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:

• Economic, regulatory, and/or socio-economic changes (including accounting standards) that impact the real estate market generally, or that could affect patterns of use of commercial office space;

• 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 affecting the office sector in general and specifically the eight markets in which we primarily operate where we have high concentrations of our Annualized Lease Revenue (see definition below);

• Lease terminations, lease defaults, or changes in the financial condition of our tenants, particularly by one of our large lead tenants;

• The effect on us of adverse market and economic conditions, including any resulting impairment charges on both our long-lived assets or goodwill;

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

• The illiquidity of real estate investments, including the resulting impediment on our ability to quickly respond to adverse changes in the performance of our properties;

• The risks and uncertainties associated with our acquisition of properties, many of which risks and uncertainties may not be known at the time of acquisition;

• Development and construction delays and resultant increased costs and risks;

• Our real estate development strategies may not be successful;

• Future acts of terrorism in any of the major metropolitan areas in which we own properties, or future cybersecurity attacks against us or any of our tenants;

• Costs of complying with governmental laws and regulations;

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

• Significant price and volume fluctuations in the public markets, including on the exchange which we listed our common stock;

• The effect of future offerings of debt or equity securities or changes in market interest rates on the value of our common stock;

• 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;

• The effect of any litigation to which we are, or may become, subject;

• Changes in tax laws impacting REITs and real estate in general, as well as our ability to continue to qualify as a REIT under the Internal Revenue Code of 1986 (the “Code”) or otherwise adversely affect our stockholders;

• The future effectiveness of our internal controls and procedures; and

• Other factors, including the risk factors discussed under Item 1A. of our Annual Report on Form 10-K for the year ended December 31, 2017.

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

Information Regarding Disclosures Presented

Annualized Lease Revenue ("ALR"), a non-U.S. generally accepted accounting principles ("GAAP") measure, is calculated by multiplying (i) rental payments (defined as base rent plus operating expense reimbursements, if payable by the tenant on a monthly basis under the terms of a lease that has been executed, but excluding (a) rental abatements and (b) rental payments related to executed but not commenced leases for space that was covered by an existing lease), by (ii) 12. In instances in which contractual rents or operating expense reimbursements are collected on an annual, semi-annual, or quarterly basis, such amounts are multiplied by a factor of 1, 2, or 4, respectively, to calculate the annualized figure. For leases that have been executed but not commenced relating to un-leased space, ALR is calculated by multiplying (i) the monthly base rental payment (excluding abatements) plus any operating expense reimbursements for the initial month of the lease term, by (ii) 12. Unless stated otherwise, this measure excludes revenues associated with re-development properties, if any. ALR should not be viewed as an alternative to rental revenues or net income calculated in accordance with GAAP or as a measurement of our operating performance. Piedmont believes that ALR is helpful to investors in assessing the relative magnitude of specific tenants, properties, or other components of our portfolio in relation to each other and to the portfolio as a whole.

4

PART I. FINANCIAL STATEMENTS

ITEM 1. CONSOLIDATED FINANCIAL STATEMENTS

The information presented in the accompanying consolidated balance sheets and related consolidated statements of income, 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 GAAP.

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, 2017. Piedmont’s results of operations for the six months endedJune 30, 2018 are not necessarily indicative of the operating results expected for the full year.

5

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED BALANCE SHEETS

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

	(Unaudited)
	June 30, 2018			December 31, 2017
Assets:
Real estate assets, at cost:
Land	$	547,602		$	544,794
Buildings and improvements, less accumulated depreciation of $831,692 and $785,206 as of June 30, 2018 and December 31, 2017, respectively	2,409,749			2,418,023
Intangible lease assets, less accumulated amortization of $79,934 and $99,145 as of June 30, 2018 and December 31, 2017, respectively	70,271			77,805
Construction in progress	17,831			11,710
Real estate assets held for sale, net	—			332,410
Total real estate assets	3,045,453			3,384,742
Amounts due from unconsolidated joint ventures	—			10
Cash and cash equivalents	8,944			7,382
Tenant receivables, net of allowance for doubtful accounts of $597 and $539 as of June 30, 2018 and December 31, 2017, respectively	9,323			12,139
Straight-line rent receivables	172,164			163,160
Note receivable	3,200			—
Restricted cash and escrows	1,415			1,373
Prepaid expenses and other assets	29,180			22,517
Goodwill	98,918			98,918
Interest rate swaps	2,679			688
Deferred lease costs, less accumulated amortization of $169,256 and $183,740 as of June 30, 2018 and December 31, 2017, respectively	252,714			261,907
Other assets held for sale, net	—			47,131
Total assets	$	3,623,990		$	3,999,967
Liabilities:
Unsecured debt, net of discount and unamortized debt issuance costs of $8,144 and $7,689 as of June 30, 2018 and December 31, 2017, respectively	$	1,529,856		$	1,535,311
Secured debt, net of premiums and unamortized debt issuance costs of $795 and $946 as of June 30, 2018 and December 31, 2017, respectively	190,990			191,616
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	94,215			216,653
Deferred income	25,532			29,582
Intangible lease liabilities, less accumulated amortization of $54,540 and $55,847 as of June 30, 2018 and December 31, 2017, respectively	40,341			38,458
Interest rate swaps	—			1,478
Other liabilities held for sale, net	—			380
Total liabilities	1,880,934			2,013,478
Commitments and Contingencies	—			—
Stockholders’ Equity:
Shares-in-trust, 150,000,000 shares authorized; none outstanding as of June 30, 2018 or December 31, 2017	—			—
Preferred stock, no par value, 100,000,000 shares authorized; none outstanding as of June 30, 2018 or December 31, 2017	—			—
Common stock, $.01 par value, 750,000,000 shares authorized; 128,370,913 and 142,358,940 shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively	1,284			1,424
Additional paid-in capital	3,681,127			3,677,360
Cumulative distributions in excess of earnings	(1,953,291		)	(1,702,281		)
Other comprehensive income	12,141			8,164
Piedmont stockholders’ equity	1,741,261			1,984,667
Noncontrolling interest	1,795			1,822
Total stockholders’ equity	1,743,056			1,986,489
Total liabilities and stockholders’ equity	$	3,623,990		$	3,999,967

See accompanying notes

6

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF INCOME

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

	(Unaudited)						(Unaudited)
	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
Revenues:
Rental income	$	101,478		$	118,492		$	202,932		$	236,531
Tenant reimbursements	22,047			24,285			45,041			49,122
Property management fee revenue	382			400			691			925
Other property related income	5,267			5,502			10,410			10,564
	129,174			148,679			259,074			297,142
Expenses:
Property operating costs	52,637			56,287			104,496			112,117
Depreciation	27,115			30,059			54,260			60,827
Amortization	15,245			19,314			31,978			39,729
General and administrative	8,258			7,528			14,810			15,678
	103,255			113,188			205,544			228,351
Real estate operating income	25,919			35,491			53,530			68,791
Other income (expense):
Interest expense	(15,687		)	(18,421		)	(29,445		)	(36,478		)
Other income/(expense)	731			38			1,177			(62		)
Equity in income of unconsolidated joint ventures	—			107			—			118
Loss on extinguishment of debt	—			—			(1,680		)	—
Gain/(loss) on sale of real estate assets, net	(23		)	6,492			45,186			6,439
Net income	10,940			23,707			68,768			38,808
Plus: Net loss applicable to noncontrolling interest	2			3			4			6
Net income applicable to Piedmont	$	10,942		$	23,710		$	68,772		$	38,814
Per share information – basic and diluted:
Net income applicable to common stockholders	$	0.09		$	0.16		$	0.52		$	0.27
Weighted-average common shares outstanding – basic	128,346,433			145,412,524			132,090,741			145,350,074
Weighted-average common shares outstanding – diluted	128,700,743			145,813,130			132,431,642			145,779,709

See accompanying notes

7

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(in thousands)

	(Unaudited)								(Unaudited)
	Three Months Ended								Six Months Ended
	June 30,								June 30,
	2018				2017				2018			2017
Net income applicable to Piedmont			$	10,942			$	23,710		$	68,772		$	38,814
Other comprehensive income:
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 6)	1,747				(911	)			3,264			132
Plus: Reclassification of net (gain)/loss included in net income (See Note 6)	(245	)			977				807			2,283
Gain on investment in available for sale securities	—				15				—			28
Other comprehensive income			1,502				81			4,071			2,443
Comprehensive income applicable to Piedmont			$	12,444			$	23,791		$	72,843		$	41,257

See accompanying notes

8

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

FOR THE YEAR ENDED DECEMBER 31, 2017

AND FOR THE SIX MONTHS ENDEDJUNE 30, 2018 (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, 2016	145,235		$	1,452		$	3,673,128		$	(1,580,863	)	$	2,104		$	1,882		$	2,097,703
Share repurchases as part of an announced plan	(3,133	)	(31		)	—			(61,719		)	—			—			(61,750		)
Offering costs	—		—			(182		)	—			—			—			(182		)
Dividends to common stockholders ($1.34 per share), stockholders of subsidiaries, and dividends reinvested	—		—			(233		)	(193,263		)	—			(45		)	(193,541		)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	257		3			4,647			—			—			—			4,650
Net loss applicable to noncontrolling interest	—		—			—			—			—			(15		)	(15		)
Net income applicable to Piedmont	—		—			—			133,564			—			—			133,564
Other comprehensive income	—		—			—			—			6,060			—			6,060
Balance, December 31, 2017	142,359		1,424			3,677,360			(1,702,281		)	8,164			1,822			1,986,489
Cumulative effect of accounting change (adoption of ASU 2016-01)	—		—			—			94			(94		)	—			—
Share repurchases as part of an announced plan	(14,343	)	(143		)	—			(264,642		)	—			—			(264,785		)
Dividends to common stockholders ($0.42 per share), stockholders of subsidiaries, and dividends reinvested	—		—			(51		)	(55,234		)	—			(23		)	(55,308		)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	355		3			3,818			—			—			—			3,821
Net loss applicable to noncontrolling interest	—		—			—			—			—			(4		)	(4		)
Net income applicable to Piedmont	—		—			—			68,772			—			—			68,772
Other comprehensive income	—		—			—			—			4,071			—			4,071
Balance, June 30, 2018	128,371		$	1,284		$	3,681,127		$	(1,953,291	)	$	12,141		$	1,795		$	1,743,056

See accompanying notes

9

PIEDMONT OFFICE REALTY TRUST, INC.

CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands) 

	(Unaudited)
	Six Months Ended
	June 30,
	2018			2017
Cash Flows from Operating Activities:
Net income	$	68,768		$	38,808
Operating distributions received from unconsolidated joint ventures	10			—
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	54,260			60,827
Amortization of debt issuance costs and net settlement of interest rate swaps	(207		)	810
Other amortization	29,061			39,034
Loss on extinguishment of debt	1,665			—
Stock compensation expense	5,004			5,403
Equity in income of unconsolidated joint ventures	—			(118		)
Gain on sale of real estate assets, net	(45,186		)	(6,439		)
Changes in assets and liabilities:
Increase in tenant and straight-line rent receivables, net	(6,974		)	(13,078		)
Increase in prepaid expenses and other assets	(6,452		)	(6,908		)
Cash received upon settlement of interest rate swaps	807			—
Decrease in accounts payable and accrued expenses	(13,672		)	(5,471		)
Decrease in deferred income	(3,839		)	(1,128		)
Net cash provided by operating activities	83,245			111,740
Cash Flows from Investing Activities:
Acquisition of real estate assets, related intangibles, and cash held in escrow for acquisitions	(28,176		)	—
Capitalized expenditures, net of accruals	(26,476		)	(58,320		)
Net sales proceeds from wholly-owned properties	419,557			23,023
Investments in unconsolidated joint ventures	—			(284		)
Note receivable issuance	(3,200		)	—
Deferred lease costs paid	(10,219		)	(9,563		)
Net cash provided by/(used in) investing activities	351,486			(45,144		)
Cash Flows from Financing Activities:
Debt issuance costs paid	(248		)	(102		)
Proceeds from debt	773,225			147,000
Repayments of debt	(780,721		)	(115,694		)
Costs of issuance of common stock	—			(74		)
Shares withheld for payment of taxes related to employee stock compensation	(2,213		)	(3,380		)
Repurchases of common stock as part of announced plan	(266,062		)	—
Dividends paid and discount on dividend reinvestments	(157,108		)	(91,664		)
Net cash used in financing activities	(433,127		)	(63,914		)
Net increase in cash, cash equivalents, and restricted cash and escrows	1,604			2,682
Cash, cash equivalents, and restricted cash and escrows, beginning of period	8,755			8,204
Cash, cash equivalents, and restricted cash and escrows, end of period	$	10,359		$	10,886

See accompanying notes

10

PIEDMONT OFFICE REALTY TRUST, INC.

CONDENSED NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

JUNE 30, 2018

(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, development, management, and ownership of commercial real estate properties located primarily in the Eastern-half of the United States, including properties that are under construction, are newly constructed, or have operating histories. Piedmont was incorporated in 1997 and commenced operations in 1998. Piedmont conducts business primarily through Piedmont Operating Partnership, L.P. (“Piedmont OP”), a Delaware limited partnership, as well as performing the management of its buildings through two wholly-owned subsidiaries, Piedmont Government Services, LLC and Piedmont Office Management, LLC. Piedmont owns 99.9% of, and is the sole general partner of, Piedmont OP and as such, possesses full legal control and authority over the operations of Piedmont OP. The remaining 0.1% ownership interest of Piedmont OP is held indirectly by Piedmont through its wholly-owned subsidiary, Piedmont Office Holdings, Inc. ("POH"), the sole limited partner of Piedmont OP. Piedmont OP owns properties directly, through wholly-owned subsidiaries, and through various joint ventures which we control. References to Piedmont herein shall include Piedmont and all of its subsidiaries, including Piedmont OP and its subsidiaries and joint ventures.

As of June 30, 2018, Piedmont owned 53 in-service office properties and one redevelopment asset. As of June 30, 2018, Piedmont's 53 in-service office properties comprise approximately 16.2 million square feet of primarily Class A commercial office space and were approximately 90.6% leased. As of June 30, 2018, approximately 91% of Piedmont's Annualized Lease Revenue (unaudited) was generated from select sub-markets located primarily within eight major office markets located in the Eastern-half of the United States: Atlanta, Boston, Chicago, Dallas, Minneapolis, New York, Orlando, and Washington, D.C.

Piedmont internally evaluates all of its real estate assets as one operating segment, and accordingly does not report segment information.

2.Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

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 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.

Piedmont’s consolidated financial statements include the accounts of Piedmont, Piedmont’s wholly-owned subsidiaries, any variable interest entity ("VIE") for which Piedmont or any of its wholly-owned subsidiaries is considered to have the power to direct the activities of the entity and the obligation to absorb losses/right to receive benefits, or any entity in which Piedmont or any of its wholly-owned subsidiaries owns a controlling interest. In determining whether Piedmont or Piedmont OP has a controlling interest, the following factors, among others, are considered: equity ownership, voting rights, protective rights of investors, and participatory rights of investors. 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, 2017.

All intercompany balances and transactions have been eliminated upon consolidation.

Further, Piedmont has formed special purpose entities to acquire and hold real estate. Each special purpose entity is a separate legal entity. Consequently, the assets of these 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.

11

Use of Estimates

The preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying consolidated financial statements and notes. Actual results could differ from those estimates.

Income Taxes

Piedmont has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended, and has operated as such, beginning with its taxable year ended December 31, 1998. To qualify as a REIT, Piedmont must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its annual REIT taxable income. As a REIT, Piedmont is generally not subject to federal income taxes, subject to fulfilling, among other things, its taxable income distribution requirement. Piedmont is subject to certain taxes related to the operations of properties in certain locations, as well as operations conducted by its taxable REIT subsidiary, POH, which have been provided for in the financial statements.

Tax Cuts and Jobs Act

The Tax Cuts and Jobs Act ("H.R. 1"), which generally took effect for taxable years that began on or after January 1, 2018 (subject to certain exceptions), made many significant changes to the U.S. federal income tax laws that will profoundly impact the taxation of individuals and corporations (including both regular C corporations and corporations that have elected to be taxed as REITs). For example, H.R. 1 limits the ability of corporations to utilize net operating loss carryforwards and limits the deductibility of business interest for all taxpayers, subject to an exception for taxpayers that are engaged in certain specified real property trades or business who make an irrevocable election not to apply the limitation to a particular real property trade or business and to depreciate their real property investments held in such trade or business using the less favorable alternative depreciation system. To date, the IRS has issued limited guidance with respect to certain of the provisions of H.R. 1, and there are numerous interpretive issues that will require guidance. In addition, changes made by H.R. 1 may require Piedmont to accrue certain income for U.S. federal income tax purposes no later than when such income is taken into account as revenue on its GAAP-based financial statements, unless the income is already subject to certain special methods of accounting under the Code. This could cause Piedmont to recognize taxable income prior to the receipt of the associated cash and accordingly, increase its distribution levels in order to maintain its status as a REIT. H.R. 1 also includes limitations on the deductibility of certain compensation paid to Piedmont's executives, certain interest payments, and certain net operating loss carryforwards, each of which could potentially increase Piedmont's taxable income and its required distributions. Piedmont recorded an approximate $0.2 million reduction to its tax liability related to its taxable REIT subsidiary as a result of the rate reduction included in H.R. 1 during the six months ended June 30, 2018. Although management is still evaluating the other effects of H.R. 1, Piedmont does not believe that H.R. 1 will significantly impact its financial statements.

Reclassifications

Certain prior period amounts presented in the accompanying consolidated statements of income have been reclassified to conform to the current period financial statement presentation. These amounts included: (i) the reclassification of approximately $5.5 million and $10.6 million for the three and six months endedJune 30, 2017, respectively, of parking, antennae license and fiber income that was previously included in rental income into other property related income, as well as certain other miscellaneous revenue into tenant reimbursements and/or property management fee revenue in conjunction with the adoption of the Revenue Recognition Amendments, as further defined and described below; and (ii) the reclassification of $0.5 million and $1.0 million for the three and six months endedJune 30, 2017, respectively, of expense related to certain regional employees who are primarily engaged in the operation and management of properties that was previously included in general and administrative expense to property operating costs.

Accounting Pronouncements Adopted during the Six Months Ended June 30, 2018

Revenue Recognition

On January 1, 2018, Piedmont adopted Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09") and Accounting Standards Update No. 2016-08, Revenue from Contracts with Customers (Topic 606) Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ("ASU 2016-08") issued by the Financial Accounting Standards Board (the "FASB"). The amendments in ASU 2014-09, which are further clarified in ASU 2016-08, as well as Accounting Standards Update 2016-10, Accounting Standards Update 2016-12, and Accounting Standards Update 2016-20 (collectively the "Revenue Recognition Amendments") change the criteria for the recognition of certain revenue streams to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in

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exchange for those goods or services using a five-step determination process.

Piedmont's revenues which are included in the scope of the Revenue Recognition Amendments include its property management fee revenue, the majority of its parking revenue, as well as certain license agreements which allow third-parties to place their antennas or fiber-optic cabling on or inside Piedmont's buildings. Lease contracts are specifically excluded from the Revenue Recognition Amendments and, Piedmont intends to utilize a leasing practical expedient, which has been tentatively approved by the FASB, to group certain non-lease components related to operating expense reimbursements with other leasing components, provided they meet certain criteria. Because the timing and pattern of transfer of Piedmont's non-lease related revenue already followed the prescribed method of the Revenue Recognition Amendments, Piedmont was able to effectively adopt these amendments on a full retrospective basis, with no impact to the timing of recognition of the related revenue; however, such non-lease revenues are now being presented as "Other property related income" in the accompanying consolidated statements of income. Further, for comparative purposes, Piedmont reclassified approximately $5.5 million and $10.6 million for the three and six months endedJune 30, 2017, respectively, of parking, antennae license, and fiber income that was previously included in rental income into other property related income, as well as certain other miscellaneous revenue into tenant reimbursements and/or property management fee revenue. Piedmont did not elect to adopt any practical expedients provided by the Revenue Recognition Amendments.

A detail of Piedmont's total revenues for the three months ended June 30, 2018 and 2017 (after reclassifications as a result of the adoption of the Revenue Recognition Amendments), including a detailed description of each line item is as follows:

			(After Adoption of Revenue Recognition Amendments)
	Three Months Ended June 30, 2018		Three Months Ended June 30, 2017
Rental income	$	101,478	$	118,492
Tenant reimbursements	22,047		24,285
Property management fee revenue	382		400
Other property related income	5,267		5,502
Total revenues	$	129,174	$	148,679

Rental income- consists of revenue from leases with Piedmont's tenants, which is not within the scope of the Revenue Recognition Amendments.

Tenant reimbursements - consists of revenue derived from reimbursements for services prescribed by leases with Piedmont's tenants separate from, but in conjunction with, the revenue generated from leasing office space. Such income is not within the scope of the Revenue Recognition Amendments.

Property management fee revenue- consists of revenue earned by Piedmont related to operating and managing office properties owned by other third-parties. Such income is within the scope of the Revenue Recognition Amendments; however, because the property management services represent a performance obligation that would be satisfied over the length of the contract, not at any specific point in time, and has the same measure of transfer (time elapsed), property management fee revenue will be recognized over time, consistent with the timing of Piedmont’s historic recognition. Any variable consideration transferred as part of these management agreements will continue to be recognized in the quarter that the underlying cash receipts are collected, consistent with the allocation objective of allocating the transaction price in an amount that depicts the amount of consideration to which Piedmont expects to be entitled in exchange for transferring the promised service to the customer.

Other property related income - consists of all other property related income from Piedmont's customers (tenants) that is not derived from a contract meeting the definition of a lease. Examples of such income include parking revenue and income from licenses with unrelated third-parties to place antennae and/or fiber optic cables in or on Piedmont's buildings. Since these services are substantially the same and have the same pattern of transfer, there is no timing difference between the recognition of other property related income and the recognition of the underlying expense/delivery of “service” under the new Revenue Recognition Amendments. Additionally, no modification to the timing of Piedmont’s previous revenue recognition is necessary, as these items have been recognized historically in accordance with this pattern of transfer.

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Gain/(loss) on Sale of Real Estate Assets

On January 1, 2018, Piedmont adopted Accounting Standards Update No. 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets ("ASU 2017-05") concurrent with the Revenue Recognition Amendments mentioned above. Piedmont elected to apply the amendments of ASU 2017-05 on a full retrospective basis; however, there were no adjustments to previously recorded gains/(losses) on sale of real estate as a result of the transition.

Equity Investments Held in Non-qualified Deferred Compensation Plan

On January 1, 2018, Piedmont adopted Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), as well as Accounting Standards Update No. 2018-03 Technical Corrections and Improvements to Financial Instruments-Overall (Subtopic 825-10) ("ASU 2018-03"). These amendments require equity investments, except those accounted for under the equity method of accounting, to be measured at estimated fair value with changes in fair value recognized in net income. Investments in trading securities held in a "rabbi trust" by Piedmont are the only securities affected by ASU 2016-01 and ASU 2018-03. As such, Piedmont has made a cumulative-effect adjustment to its consolidated balance sheet and consolidated statements of stockholders' equity of approximately $0.1 million from other comprehensive income to cumulative distributions in excess of earnings, and has recorded changes in fair value in net income for the three and six months endedJune 30, 2018 related to these investment securities.

Interest Rate Derivatives

On January 1, 2018, Piedmont early adopted Accounting Standards Update No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"). Piedmont adopted ASU 2017-12 using the modified retrospective transition method; however, no adjustment was necessary to account for the cumulative effect of the change on the opening balance of each affected component of equity in the consolidated balance sheet as of the date of adoption because there was no cumulative ineffectiveness that had been recorded on Piedmont's existing interest rate swaps as of December 31, 2017, and all other trades were perfectly effective. The amended presentation and disclosure guidance which is required to be presented prospectively is provided inNote 6.

Other Recent Accounting Pronouncements

The FASB has issued Accounting Standards Update No. 2016-02, Leases (Topic 842) ("ASU 2016-02"), which fundamentally changes the definition of a lease, as well as the accounting for operating leases by requiring lessees to recognize assets and liabilities which arise from the lease, consisting of a liability to make lease payments (the lease liability) and a right-of-use asset, representing the right to use the leased asset over the term of the lease. Accounting for leases by lessors is substantially unchanged from prior practice as lessors will continue to recognize lease revenue on a straight-line basis. Additionally, Accounting Standards Update No. 2018-11, Leases (Topic 842) Targeted Improvements ("ASU 2018-11") issued by the FASB allows certain non-lease operating expense reimbursements to be accounted for as part of the lease provided certain criteria are met under an optional practical expedient. Further, the FASB has issued Accounting Standards Update No. 2018-01 Leases (Topic 842) Land Easement Practical Expedient for Transition to Topic 842 ("ASU 2018-01"). The amendments to ASU No. 2018-01 clarify that a land easement is required to be evaluated to determine whether it should be accounted for as a lease upon adoption of ASU 2016-02, and provides an optional practical transition expedient allowing entities not currently assessing land easements under existing leasing guidance prior to adoption of ASU 2016-02 to not apply the new guidance to land easements existing at the date of initial adoption of ASU 2016-02. The amendments in ASU 2016-02, ASU 2018-01, and ASU 2018-11 are effective in the first quarter of 2019. Although management continues to evaluate the guidance and disclosures required by these amendments, Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption related to lessor accounting. However, Piedmont does expect to record a right-to-use asset and related liability under lessee accounting, and Piedmont is still evaluating the potential impact of such lessee accounting.

The FASB has issued Accounting Standards Update No. 2018-07, Stock Compensation (Topic 718), Improvements to NonEmployee Share-Based Payment Accounting ("ASU 2018-07"). The provisions of ASU 2018-07 align accounting for stock based compensation for non-employees for goods and services with existing accounting for similar compensation for employees. The amendments supersede previous guidance on accounting for share-based payments to non-employees codified in the FASB's Accounting Standards Codification ("ASC") 505-50. ASU 2018-07 is effective in the first quarter of 2019, with early adoption permitted at any time provided that the entity has already adopted the provisions of ASC 606. Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption.

The FASB has issued Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses (Topic 326),Measurement

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of Credit Losses on Financial Instruments ("ASU 2016-13"). The provisions of ASU 2016-13 replace the "incurred loss" approach with an "expected loss" model for impairing trade and other receivables, held-to-maturity debt securities, net investment in leases, and off-balance-sheet credit exposures, which will generally result in earlier recognition of allowances for credit losses. Additionally, the provisions change the classification of credit losses related to available-for-sale securities to an allowance, rather than a direct reduction of the amortized cost of the securities. ASU 2016-13 is effective in the first quarter of 2020, with early adoption permitted as of January 1, 2019. Piedmont is currently evaluating the potential impact of adoption.

3.Acquisitions

During the six months endedJune 30, 2018, Piedmont acquired one property using proceeds available as a result of dispositions (see Note 9) in January 2018 and cash on hand, as noted below:

Property	Metropolitan Statistical Area	Date of Acquisition	Ownership Percentage Acquired		Rentable Square Feet	Percentage Leased as of Acquisition		Net Contractual Purchase Price  (in millions)
501 West Church Street	Orlando, Florida	February 23, 2018	100	%	182,461	100	%	$	28.0

4.Debt

During the six months ended June 30, 2018, Piedmont fully repaid the balances of the $300 Million Unsecured 2013 Term Loan and the $170 Million Unsecured 2015 Term Loan using proceeds from the 2017 Disposition Portfolio (see Note 9) and cash on hand, as well as drawing on its $500 Million Unsecured 2015 Line of Credit. Further, Piedmont had net borrowings during the six months ended June 30, 2018 on its $500 Million Unsecured 2015 Line of Credit of approximately $215.0 million, which brought the outstanding balance on the $500 Million Unsecured 2015 Line of Credit to $238 million as of June 30, 2018.

Additionally during the six months ended June 30, 2018, Piedmont entered into a $250 million unsecured term loan facility (the “$250 Million Unsecured 2018 Term Loan”) with a consortium of lenders. The term of the $250 Million Unsecured 2018 Term Loan is seven years with a maturity date of March 31, 2025; however, Piedmont may prepay the $250 Million Unsecured 2018 Term Loan, in whole or in part, at any time after March 29, 2020 without premium or penalty. The proceeds of the $250 Million Unsecured 2018 Term Loan were used to reduce the outstanding balance under the $500 Million Unsecured 2015 Line of Credit on the date the proceeds were received.

The $250 Million Unsecured 2018 Term Loan has the option to bear interest at varying levels based on either (i) the London Interbank Offered Rate (“LIBOR”) for an interest period selected by Piedmont of one, two, three, or six months, or to the extent available from all lenders in each case, one year or periods of less than one month, or (ii) Base Rate, defined as the greater of the prime rate, the federal funds rate plus 0.5%, or LIBOR for a one-month period plus 1%; plus a stated interest rate spread based on the higher credit rating level issued for either Piedmont or Piedmont OP. The stated interest rate spread over LIBOR can vary from 1.45% to 2.40% based upon the then current credit rating of Piedmont or Piedmont OP, whichever is higher. As of June 30, 2018, the stated interest rate spread on the $250 Million Unsecured 2018 Term Loan was 1.60%.

Under the $250 Million Unsecured 2018 Term Loan, Piedmont is subject to certain financial covenants that require, among other things, the maintenance of an unencumbered interest coverage ratio of at least 1.75, an unencumbered leverage ratio of at least 1.60, a fixed charge coverage ratio of at least 1.50, a leverage ratio of no more than 0.60, and a secured debt ratio of no more than 0.40. In addition, Piedmont entered into three interest rate swap agreements for a total notional amount of $150 million which effectively fixed $150 million of the $250 Million Unsecured 2018 Term Loan at an interest rate of approximately 4.11%.

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The following table summarizes the terms of Piedmont’s indebtedness outstanding as of June 30, 2018 and December 31, 2017 (in thousands):

Facility (1)	Stated Rate		Effective Rate (2)			Maturity		Amount Outstanding as of
								June 30, 2018		December 31, 2017
Secured (Fixed)
$35 Million Fixed-Rate Loan (3)	5.55	%	3.75	%		9/1/2021		$	30,195	$	30,670
$160 Million Fixed-Rate Loan (4)	3.48	%	3.58	%		7/5/2022		160,000		160,000
Net premium and unamortized debt issuance costs								795		946
Subtotal/Weighted Average (5)	3.81	%						190,990		191,616
Unsecured (Variable and Fixed)
$170 Million Unsecured 2015 Term Loan	LIBOR + 1.125%		2.54	%		5/15/2018		—		170,000
$300 Million Unsecured 2013 Term Loan	LIBOR + 1.20%		2.78	%	(7)	1/31/2019		—		300,000
$500 Million Unsecured 2015 Line of Credit (6)	LIBOR + 1.00%		3.08	%		6/18/2019	(8)	238,000		23,000
$300 Million Unsecured 2011 Term Loan	LIBOR +  1.15%		3.35	%	(7)	1/15/2020		300,000		300,000
$350 Million Senior Notes	3.40	%	3.43	%		6/01/2023		350,000		350,000
$400 Million Senior Notes	4.45	%	4.10	%		3/15/2024		400,000		400,000
$250 Million Unsecured 2018 Term Loan	LIBOR + 1.60%		3.95	%	(9)	3/31/2025		250,000		—
Discounts and unamortized debt issuance costs								(8,144)		(7,689)
Subtotal/Weighted Average (5)	3.70	%						1,529,856		1,535,311
Total/Weighted Average (5)	3.71	%						$	1,720,846	$	1,726,927

⁽¹⁾  Other than the $35 Million Fixed-Rate Loan, all of Piedmont’s outstanding debt as of June 30, 2018 and December 31, 2017 is interest-only.

⁽²⁾  Effective rate after consideration of settled or in-place interest rate swap agreements, issuance premiums/discounts, and/or fair market value adjustments upon assumption of debt.

⁽³⁾  Collateralized by the 5 Wall Street building in Burlington, Massachusetts.

⁽⁴⁾  Collateralized by the 1901 Market Street building in Philadelphia, Pennsylvania.

⁽⁵⁾  Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates as of June 30, 2018.

⁽⁶⁾  On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length LIBOR locks on all or a portion of the principal. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating.

⁽⁷⁾  The facility has a stated variable rate; however, Piedmont has entered into interest rate swap agreements which effectively fix, exclusive of changes in Piedmont's credit rating, the rate to that shown as the effective rate.

⁽⁸⁾  Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided Piedmont is not then in default and upon payment of extension fees.

⁽⁹⁾  The facility has a stated variable rate; however, Piedmont has entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, $150 million of the principal balance to 4.11% through March 29, 2020, and $100 million of the principal balance to 4.21% from March 30, 2020 through the maturity date of the loan. For the remaining variable portion of the loan, Piedmont may periodically select from multiple interest rate options, including the prime rate and various-length LIBOR locks on all or a portion of the principal. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating. The rate presented is the weighted-average rate for the effectively fixed and variable portions of the debt outstanding as of June 30, 2018.

Piedmont made interest payments on all debt facilities, including interest rate swap cash settlements, of approximately $14.8 million and $16.7 million for the three months endedJune 30, 2018 and 2017, respectively, and approximately $30.7 million and $36.0 million for the six months endedJune 30, 2018 and 2017, respectively. Also, Piedmont capitalized interest of approximately $346,000 and $35,000 for the three months endedJune 30, 2018 and 2017, respectively, and approximately $0.5 million and $0.1 million for the six months endedJune 30, 2018 and 2017, respectively. As of June 30, 2018, Piedmont believes it was in compliance

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with all financial covenants associated with its debt instruments. See Note 7 for a description of Piedmont’s estimated fair value of debt as of June 30, 2018.

5.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 must consolidate the VIE. Each of the following VIEs has the sole purpose of holding land and office buildings and their resulting operations, and are classified in the accompanying consolidated balance sheets in the same manner as Piedmont’s wholly-owned properties.

A summary of Piedmont’s interests in its consolidated VIEs and their related carrying values as of June 30, 2018 and December 31, 2017 is as follows (net carrying amount in millions):

	Piedmont's %		Net Carrying Amount as of		Net Carrying Amount as of
Entity	Ownership of Entity	Related Building	June 30, 2018		December 31, 2017		Primary Beneficiary Considerations
1201 Eye Street N.W. Associates, LLC	98.6%	1201 Eye Street	$	87.5	$	81.1	In accordance with the partnership’s governing documents, Piedmont currently receives 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building.
1225 Eye Street N.W. Associates, LLC	98.1%	1225 Eye Street	$	64.5	$	65.2	In accordance with the partnership’s governing documents, Piedmont currently receives 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	$	256.5	$	263.2	The Omnibus Agreement with the previous owner includes equity participation rights upon sale of the property for the previous owner, if certain financial returns are achieved; however, Piedmont has sole decision making authority and is entitled to 100% of the economic benefits of the property until such returns are met.

6.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 exchange of the underlying notional amount.

As of June 30, 2018, Piedmont was party to interest rate swap agreements, all of which are designated as effective cash flow hedges and fully hedge the variable cash flows covering the entire outstanding balance of the $300 Million Unsecured 2011 Term Loan, and $150 million of the $250 Million Unsecured 2018 Term Loan. The maximum length of time over which Piedmont is hedging its exposure to the variability in future cash flows for forecasted transactions is 81 months.

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A detail of Piedmont’s interest rate derivatives outstanding as of June 30, 2018 is as follows:

Interest Rate Derivatives:	Number of Swap Agreements	Associated Debt Instrument	Total Notional Amount (in millions)		Effective Date	Maturity Date
Interest rate swaps	3	$300 Million Unsecured 2011 Term Loan	$	300	11/22/2016	1/15/2020
Interest rate swaps	2	$250 Million Unsecured 2018 Term Loan	$	100	3/29/2018	3/31/2025
Interest rate swaps	1	$250 Million Unsecured 2018 Term Loan	$	50	3/29/2018	3/29/2020
Total			$	450

Piedmont presents its interest rate derivatives on its consolidated balance sheets on a gross basis as interest rate swap assets and interest rate swap liabilities. A detail of Piedmont’s interest rate derivatives on a gross and net basis as of June 30, 2018 and December 31, 2017, respectively, is as follows (in thousands):

Interest rate swaps classified as:	June 30, 2018		December 31, 2017
Gross derivative assets	$	2,679	$	688
Gross derivative liabilities	—		(1,478		)
Net derivative asset/(liability)	$	2,679	$	(790	)

The gain/(loss) on Piedmont's interest rate derivatives, including previously settled forward swaps, that was recorded in OCI and the accompanying consolidated statements of income as a component of interest expense for the three and six months endedJune 30, 2018 and 2017, respectively, was as follows (in thousands):

	Three Months Ended					Six Months Ended
Interest Rate Swaps in Cash Flow Hedging Relationships	June 30, 2018		June 30, 2017			June 30, 2018			June 30, 2017
Amount of gain/(loss) recognized in OCI	$	1,747	$	(911	)	$	3,264		$	132
Amount of previously recorded gain/(loss) reclassified from OCI into Interest Expense	$	245	$	(977	)	$	451		$	(2,283	)
Amount of gain/(loss) recognized on derivatives reclassified from OCI into Loss on Extinguishment of Debt	$	—	$	—		$	(1,258	)	$	—
Total amount of Interest Expense presented in the consolidated statements of income	$	15,687	$	18,421		$	29,445		$	36,478
Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of income (1)	$	—	$	—		$	1,680		$	—

⁽¹⁾  Includes the write-off of approximately $0.4 million of discounts and unamortized debt issuance costs associated with the repayment of debt (see Note 4).

Piedmont estimates that approximately $2.8 million will be reclassified from OCI as a reduction of interest expense over the next twelve months. Piedmont recognized no hedge ineffectiveness on its cash flow hedges during the three and six months endedJune 30, 2018 and 2017, respectively.

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

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also be declared in default on its derivative obligations. Because all of Piedmont's interest rate swaps are in an asset position, if Piedmont were to breach any of the contractual provisions of the derivative contracts, the settlement of its obligations under the agreements would not result in a penalty as of June 30, 2018. 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.

7.Fair Value Measurement of Financial Instruments

Piedmont considers its cash and cash equivalents, tenant receivables, notes receivable, restricted cash and escrows, accounts payable and accrued expenses, interest rate swap agreements, and debt to meet the definition of financial instruments. The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of June 30, 2018 and December 31, 2017, respectively (in thousands):

	June 30, 2018					December 31, 2017
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)	$	8,944	$	8,944	Level 1	$	7,382	$	7,382	Level 1
Tenant receivables, net(1)	$	9,323	$	9,323	Level 1	$	12,139	$	12,139	Level 1
Notes receivable (1)	$	3,200	$	3,200	Level 1	$	—	$	—	Level 1
Restricted cash and escrows(1)	$	1,415	$	1,415	Level 1	$	1,373	$	1,373	Level 1
Interest rate swaps	$	2,679	$	2,679	Level 2	$	688	$	688	Level 2
Liabilities:
Accounts payable and accrued expenses(1)	$	11,000	$	11,000	Level 1	$	126,429	$	126,429	Level 1
Interest rate swaps	$	—	$	—	Level 2	$	1,478	$	1,478	Level 2
Debt, net	$	1,720,846	$	1,725,912	Level 2	$	1,726,927	$	1,759,905	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 June 30, 2018 and December 31, 2017; however, Piedmont's estimate of its estimated fair value is disclosed in the table above. Piedmont uses widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the debt facilities, including the period to maturity of each instrument, and uses observable market-based inputs for similar debt facilities which have transacted recently in the market. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). Scaling adjustments are made to these inputs to make them applicable to the remaining life of Piedmont's outstanding debt. Piedmont has not changed its valuation technique for estimating the fair value of its debt.

Piedmont’s interest rate swap agreements presented above, and further discussed in Note 6, are classified as “Interest rate swap” assets and liabilities in the accompanying consolidated balance sheets and were carried at estimated fair value as of June 30, 2018 and December 31, 2017. The valuation of these derivative instruments was determined using widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the derivatives, including the period to maturity of each instrument, and uses observable market-based inputs, including interest rate curves and implied volatilities. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). In addition, Piedmont considered both its own and the respective counterparties’ risk of nonperformance in determining the estimated fair value of its derivative financial instruments by estimating the current and potential future exposure under the derivative financial instruments that both Piedmont and the counterparties were at risk for as of the valuation date. The credit risk of Piedmont and its counterparties were factored into the calculation of the estimated fair value of the interest rate swaps; however, as of June 30, 2018 and December 31, 2017, this credit valuation adjustment did not comprise a material portion of the estimated fair value. Therefore, Piedmont believes that any unobservable inputs used to determine the estimated fair values of its derivative financial instruments are not significant to the fair value measurements in their entirety, and does not consider any of its derivative financial instruments to be Level 3 assets or liabilities.

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8.Commitments and Contingencies

Commitments Under Existing Lease Agreements

Under its existing lease agreements, Piedmont may be required to fund significant tenant improvements, leasing commissions, and building improvements. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for capital improvements or other financial obligations. Piedmont classifies its capital improvements into two categories: (i) improvements which maintain the building's existing asset value and its revenue generating capacity (“non-incremental capital expenditures”) and (ii) improvements which incrementally enhance the building's asset value by expanding its revenue generating capacity (“incremental capital expenditures”). As of June 30, 2018, commitments to fund potential non-incremental capital expenditures over the next five years for tenant improvements totaled approximately $40.0 million related to Piedmont's existing lease portfolio over the respective lease terms, the majority of which Piedmont estimates may be required to be funded over the next three years based on when the underlying leases commence. For most of Piedmont’s leases, the timing of the actual funding of these tenant improvements is largely dependent upon tenant requests for reimbursement. In some cases, these obligations may expire with the leases without further recourse to Piedmont. As of June 30, 2018, commitments for incremental capital expenditures for tenant improvements associated with executed leases totaled approximately $11.8 million.

Contingencies Related to Tenant Audits/Disputes

Certain lease agreements include provisions that grant tenants the right to engage independent auditors to audit their annual operating expense reconciliations. Such audits may result in the re-interpretation of language in the lease agreements which could result in the refund of previously recognized tenant reimbursement revenues, resulting in financial loss to Piedmont. Piedmont recorded $0 and $20,000 of such reductions in reimbursement revenues related to such tenant audits/disputes during the three months endedJune 30, 2018 and 2017, respectively, and $0.4 million and $0.3 million of such reductions in reimbursement revenues related to such tenant audits/disputes during the six months endedJune 30, 2018 and 2017, respectively.

9.Assets Held for Sale

As of June 30, 2018, no properties met the criteria for held for sale classification. However, during the six months endedJune 30, 2018, Piedmont sold a portfolio of 14 properties (the "2017 Disposition Portfolio"). As of December 31, 2017, the 2017 Disposition Portfolio met the criteria for held for sale classification, and such properties are shown as held for sale as of December 31, 2017 in the consolidated balance sheet. Details of assets held for sale as of June 30, 2018 and December 31, 2017 are presented below (in thousands):

	June 30, 2018		December 31, 2017
Real estate assets held for sale, net:
Land	$	—	$	74,498
Building and improvements, less accumulated depreciation of $0 and $169,116 as of June 30, 2018 and December 31, 2017, respectively	—		255,634
Construction in progress	—		2,278
Total real estate assets held for sale, net	$	—	$	332,410
Other assets held for sale, net:
Straight-line rent receivables	$	—	$	25,975
Prepaid expenses and other assets	—		328
Deferred lease costs, less accumulated amortization of $0 and $16,549 as of June 30, 2018 and December 31, 2017, respectively	—		20,828
Total other assets held for sale, net	$	—	$	47,131
Other liabilities held for sale, net:
Intangible lease liabilities, less accumulated amortization of $0 and $935 as of June 30, 2018 and December 31, 2017, respectively	$	—	$	380

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10.Stock Based Compensation

The Compensation Committee of Piedmont's Board of Directors has periodically granted deferred stock awards to all of Piedmont's employees and independent directors. Employee awards typically vest ratably over a multi-year period and independent director awards vest over one year. Certain employees' long-term equity incentive program is split equally between the time-vested awards described above and a multi-year performance share program whereby the actual awards are contingent upon Piedmont's total stockholder return ("TSR") relative to a peer group's TSR. The peer group is predetermined by the Board of Directors. Any shares earned are awarded at the end of the multi-year performance period and vest upon award.

A rollforward of Piedmont's equity based award activity for the six months endedJune 30, 2018 is as follows:

	Shares		Weighted-Average Grant Date Fair Value
Unvested and Potential Stock Awards as of December 31, 2017	868,437		$	21.69
Deferred Stock Awards Granted	354,236		$	17.84
Increase in Estimated Potential Share Award	379,249		$	23.80
Performance Stock Awards Vested	(161,005	)	$	18.47
Deferred Stock Awards Vested	(331,195	)	$	19.21
Deferred Stock Awards Forfeited	(6,515	)	$	19.98
Unvested and Potential Stock Awards as of June 30, 2018	1,103,207		$	22.42

The following table provides additional information regarding stock award activity during the three and six months endedJune 30, 2018 and 2017, respectively (in thousands, except per share amounts):

	Three Months Ended				Six Months Ended
	June 30, 2018		June 30, 2017		June 30, 2018		June 30, 2017
Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period	$	17.84	$	21.38	$	17.84	$	21.38
Total Grant Date Fair Value of Deferred Stock Vested During the Period	$	5,639	$	5,551	$	6,363	$	5,841
Share-based Liability Awards Paid During the Period(1)	$	—	$	—	$	2,947	$	2,877

⁽¹⁾  Amounts reflect the issuance of performance share awards related to the 2014-16 and 2015-17 Performance Share Plans during the six months endedJune 30, 2018 and 2017, respectively.

21

A detail of Piedmont’s outstanding stock awards as of June 30, 2018 is as follows:

Date of grant	Type of Award	Net Shares Granted (1)	Grant Date Fair Value		Vesting Schedule	Unvested Shares
January 3, 2014	Deferred Stock Award	72,969	$	16.45	Of the shares granted, 20% vested or will vest on January 3, 2015, 2016, 2017, 2018, and 2019, respectively.	16,416
May 24, 2016	Deferred Stock Award	208,055	$	19.91	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 24, 2017, 2018, and 2019, respectively.	60,975
May 24, 2016	Fiscal Year 2016-2018 Performance Share Program	—	$	23.02	Shares awarded, if any, will vest immediately upon determination of award in 2019.	119,371	(2)
May 18, 2017	Deferred Stock Award	219,947	$	21.38	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 18, 2018, 2019, and 2020, respectively.	124,281
May 18, 2017	Fiscal Year 2017-2019 Performance Share Program	—	$	30.45	Shares awarded, if any, will vest immediately upon determination of award in 2020.	143,335	(2)
May 17, 2018	Deferred Stock Award-Board of Directors	31,388	$	17.84	Of the shares granted, 100% will vest by May 17, 2019.	31,388
May 17, 2018	Deferred Stock Award	302,865	$	17.84	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 17, 2019, 2020, and 2021, respectively.	241,409
May 17, 2018	Fiscal Year 2018-2020 Performance Share Program	—	$	23.52	Shares awarded, if any, will vest immediately upon determination of award in 2021.	366,032	(2)
Total						1,103,207

⁽¹⁾  Amounts reflect the total grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through June 30, 2018.

⁽²⁾  Estimated based on Piedmont's cumulative TSR for the respective performance period through June 30, 2018. Share estimates are subject to change in future periods based upon Piedmont's relative performance compared to its peers' total stockholder return.

During the three months endedJune 30, 2018 and 2017, Piedmont recognized approximately $4.0 million and $2.6 million of compensation expense related to stock awards, of which $2.6 million and $1.1 million is related to the amortization of unvested shares, respectively. During the six months endedJune 30, 2018 and 2017, Piedmont recognized approximately $5.0 million and $5.7 million of compensation expense related to stock awards, of which $3.9 million and $4.2 million is related to the amortization of unvested shares, respectively. During the six months endedJune 30, 2018, a net total of 354,526 shares were issued to employees. As of June 30, 2018, approximately $6.3 million of unrecognized compensation cost related to unvested deferred stock awards remained, which Piedmont will record in its consolidated statements of income over a weighted-average vesting period of approximately two years.

22

11.Supplemental Disclosures for the Statement of Consolidated Cash Flows

Certain noncash investing and financing activities for the six months endedJune 30, 2018 and 2017, (in thousands) are outlined below:

	Six Months Ended
	June 30, 2018			June 30, 2017
Accrued capital expenditures and deferred lease costs	$	8,920		$	9,417
Change in accrued dividends and discount on dividend reinvestments	$	(101,800	)	$	(30,532	)
Change in accrued share repurchases as part of an announced plan	$	(1,277	)	$	—

The following table provides a reconciliation of cash, cash equivalents, and restricted cash and escrows as reported, or previously reported, within the consolidated balance sheet to the consolidated statement of cash flows as of the six months endedJune 30, 2018 and 2017, respectively (in thousands).

	Six Months Ended
	June 30, 2018		June 30, 2017
Cash and cash equivalents, beginning of period	$	7,382	$	6,992
Restricted cash and escrows, beginning of period	1,373		1,212
Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, beginning of period	$	8,755	$	8,204
Cash and cash equivalents, end of period	$	8,944	$	9,596
Restricted cash and escrows, end of period	1,415		1,290
Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, end of period	$	10,359	$	10,886

Amounts in real estate tax and escrowed cash represent deposits which are required by Piedmont’s lenders under certain of its debt agreements to escrow amounts for the payment of real estate taxes, and other amounts escrowed, for instance, earnest money deposited for the purchase of a property. Security and utility deposit escrows represent the cash held for tenants and/or Piedmont for lease related deposits.

12.Earnings Per Share

There are no adjustments to “Net income applicable to Piedmont” 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 unvested deferred stock awards. Diluted weighted average number of common shares reflects the potential dilution under the treasury stock method that would occur if the remaining unvested deferred stock awards vested and resulted in additional common shares outstanding. Unvested deferred stock awards which are determined to be anti-dilutive are not included in the calculation of diluted weighted average common shares.

23

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 six months endedJune 30, 2018 and 2017, respectively (in thousands):

	Three Months Ended		Six Months Ended
	June 30, 2018	June 30, 2017	June 30, 2018	June 30, 2017
Weighted-average common shares – basic	128,346	145,413	132,091	145,350
Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards	355	400	341	430
Weighted-average common shares – diluted	128,701	145,813	132,432	145,780
Common stock issued and outstanding as of period end			128,371	145,490

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13.Guarantor and Non-Guarantor Financial Information

The following condensed consolidating financial information for Piedmont (the "Parent", "Guarantor", and/or "Consolidated"), Piedmont OP (the "Issuer"), and the other directly and indirectly owned subsidiaries of Piedmont as the Guarantor (the "Non-Guarantors") is provided pursuant to the requirements of Rule 3-10 of Regulation S-X regarding financial statements of guarantors and issuers of guaranteed registered securities. The Issuer is a wholly-owned subsidiary of the Guarantor, and all guarantees by the Guarantor of securities issued by the Issuer are full and unconditional. The principal elimination entries relate to investments in subsidiaries and intercompany balances and transactions, including transactions with the Non-Guarantors.

Condensed Consolidating Balance Sheets
As of June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations			Piedmont (Consolidated)
Assets:
Real estate assets, at cost:
Land	$	—	$	36,094	$	511,508	$	—		$	547,602
Buildings and improvements, less accumulated depreciation	—		176,704		2,233,345		(300		)	2,409,749
Intangible lease assets, less accumulated amortization	—		—		70,271		—			70,271
Construction in progress	—		408		17,423		—			17,831
Total real estate assets	—		213,206		2,832,547		(300		)	3,045,453
Cash and cash equivalents	150		5,311		3,483		—			8,944
Tenant and straight-line rent receivables, net	—		15,467		166,020		—			181,487
Investment in subsidiaries	1,743,439		2,803,136		169		(4,546,744		)	—
Notes receivable	—		810		147,700		(145,310		)	3,200
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	77		7,020		26,205		(28		)	33,274
Goodwill	—		98,918		—		—			98,918
Deferred lease costs, net	—		15,530		237,184		—			252,714
Total assets	$	1,743,666	$	3,159,398	$	3,413,308	$	(4,692,382	)	$	3,623,990
Liabilities:
Debt, net	$	—	$	1,529,792	$	336,364	$	(145,310	)	$	1,720,846
Accounts payable, accrued expenses, and accrued capital expenditures	610		15,012		78,621		(28		)	94,215
Deferred income	—		2,185		23,347		—			25,532
Intangible lease liabilities, net	—		—		40,341		—			40,341
Total liabilities	610		1,546,989		478,673		(145,338		)	1,880,934
Equity:
Total stockholders’ equity	1,743,056		1,612,409		2,934,635		(4,547,044		)	1,743,056
Total liabilities and stockholders’ equity	$	1,743,666	$	3,159,398	$	3,413,308	$	(4,692,382	)	$	3,623,990

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Condensed Consolidating Balance Sheets
As of December 31, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)		Non-Guarantors		Eliminations			Piedmont (Consolidated)
Assets:
Real estate assets, at cost:
Land	$	—		$	36,094	$	508,700	$	—		$	544,794
Buildings and improvements, less accumulated depreciation	—			180,886		2,237,437		(300		)	2,418,023
Intangible lease assets, less accumulated amortization	—			181		77,624		—			77,805
Construction in progress	—			85		11,625		—			11,710
Real estate assets held for sale, net	—			32,815		299,595		—			332,410
Total real estate assets	—			250,061		3,134,981		(300		)	3,384,742
Cash and cash equivalents	150			3,890		3,342		—			7,382
Tenant and straight-line rent receivables, net, and amounts due from unconsolidated joint ventures	—			16,891		158,418		—			175,309
Advances to affiliates	1,674,276			6,297,632		—		(7,971,908		)	—
Investment in subsidiary	3,437,299			—		172		(3,437,471		)	—
Notes receivable	—			88,810		144,500		(233,310		)	—
Prepaid expenses, restricted cash, escrows, interest rate swaps and other assets	2			5,094		20,222		(740		)	24,578
Goodwill	—			98,918		—		—			98,918
Deferred lease costs, net	—			16,611		245,296		—			261,907
Other assets held for sale, net	—			2,266		44,865		—			47,131
Total assets	$	5,111,727		$	6,780,173	$	3,751,796	$	(11,643,729	)	$	3,999,967
Liabilities:
Debt, net	$	—		$	1,535,239	$	424,998	$	(233,310	)	$	1,726,927
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	104,028			20,279		93,086		(740		)	216,653
Advances from affiliates	5,277,957			941,494		1,850,712		(8,070,163		)	—
Deferred income	—			3,631		25,951		—			29,582
Intangible lease liabilities, net	—			—		38,458		—			38,458
Interest rate swaps	—			1,478		—		—			1,478
Liabilities held for sale, net	—			—		380		—			380
Total liabilities	5,381,985			2,502,121		2,433,585		(8,304,213		)	2,013,478
Equity:
Total stockholders’ equity	(270,258		)	4,278,052		1,318,211		(3,339,516		)	1,986,489
Total liabilities and stockholders’ equity	$	5,111,727		$	6,780,173	$	3,751,796	$	(11,643,729	)	$	3,999,967

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Consolidating Statements of Income
For the three months ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	9,238		$	92,723		$	(483	)	$	101,478
Tenant reimbursements	—			2,195			19,961			(109		)	22,047
Property management fee revenue	—			—			4,147			(3,765		)	382
Other property related income	—			29			5,238			—			5,267
	—			11,462			122,069			(4,357		)	129,174
Expenses:
Property operating costs	—			4,927			52,067			(4,357		)	52,637
Depreciation	—			2,846			24,269			—			27,115
Amortization	—			463			14,782			—			15,245
General and administrative	86			1,539			6,633			—			8,258
	86			9,775			97,751			(4,357		)	103,255
Real estate operating income/(loss)	(86		)	1,687			24,318			—			25,919
Other income (expense):
Interest expense	—			(13,953		)	(3,614		)	1,880			(15,687		)
Other income/(expense)	—			36			2,575			(1,880		)	731
Loss on sale of real estate assets, net	—			(13		)	(10		)	—			(23		)
	—			(13,930		)	(1,049		)	—			(14,979		)
Income/(loss) before consolidated subsidiaries	(86		)	(12,243		)	23,269			—			10,940
Income from subsidiaries	11,028			24,557			—			(35,585		)	—
Net income	10,942			12,314			23,269			(35,585		)	10,940
Plus: Net loss applicable to noncontrolling interest	—			—			2			—			2
Net income applicable to Piedmont	$	10,942		$	12,314		$	23,271		$	(35,585	)	$	10,942

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Consolidating Statements of Income
For the three months ended June 30, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	11,068		$	107,909		$	(485	)	$	118,492
Tenant reimbursements	—			2,966			21,446			(127		)	24,285
Property management fee revenue	—			—			4,590			(4,190		)	400
Other property related income	—			22			5,480			—			5,502
	—			14,056			139,425			(4,802		)	148,679
Expenses:
Property operating costs	—			5,853			55,236			(4,802		)	56,287
Depreciation	—			3,281			26,778			—			30,059
Amortization	—			803			18,511			—			19,314
General and administrative	81			1,528			5,919			—			7,528
	81			11,465			106,444			(4,802		)	113,188
Real estate operating income/(loss)	(81		)	2,591			32,981			—			35,491
Other income (expense):
Interest expense	—			(14,810		)	(7,262		)	3,651			(18,421		)
Other income/(expense)	—			2,240			1,449			(3,651		)	38
Equity in income of unconsolidated joint ventures	—			107			—			—			107
Gain/(loss) on sale of real estate assets, net	—			6,495			(3		)	—			6,492
Net income/(loss)	(81		)	(3,377		)	27,165			—			23,707
Plus: Net loss applicable to noncontrolling interest	—			—			3			—			3
Net income/(loss) applicable to Piedmont	$	(81	)	$	(3,377	)	$	27,168		$	—		$	23,710

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Consolidating Statements of Income
For the six months ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	18,052		$	185,794		$	(914	)	$	202,932
Tenant reimbursements	—			4,840			40,395			(194		)	45,041
Property management fee revenue	—			—			8,328			(7,637		)	691
Other property related income	—			57			10,353			—			10,410
	—			22,949			244,870			(8,745		)	259,074
Expenses:
Property operating costs	—			9,641			103,600			(8,745		)	104,496
Depreciation	—			5,710			48,550			—			54,260
Amortization	—			1,074			30,904			—			31,978
General and administrative	186			3,425			11,199			—			14,810
	186			19,850			194,253			(8,745		)	205,544
Real estate operating income/(loss)	(186		)	3,099			50,617			—			53,530
Other income (expense):
Interest expense	—			(25,975		)	(7,312		)	3,842			(29,445		)
Other income/(expense)	—			160			4,859			(3,842		)	1,177
Loss on extinguishment of debt	—			(1,680		)	—			—			(1,680		)
Gain on sale of real estate assets, net	—			1,417			43,769			—			45,186
	—			(26,078		)	41,316			—			15,238
Income/(loss) before consolidated subsidiaries	(186		)	(22,979		)	91,933			—			68,768
Income from subsidiaries	68,958			92,226			—			(161,184		)	—
Net income	68,772			69,247			91,933			(161,184		)	68,768
Plus: Net loss applicable to noncontrolling interest	—			—			4			—			4
Net income applicable to Piedmont	$	68,772		$	69,247		$	91,937		$	(161,184	)	$	68,772

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Consolidating Statements of Income
For the six months ended June 30, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	22,456		$	215,019		$	(944	)	$	236,531
Tenant reimbursements	—			5,971			43,381			(230		)	49,122
Property management fee revenue	—			—			9,226			(8,301		)	925
Other property related income	—			54			10,510			—			10,564
	—			28,481			278,136			(9,475		)	297,142
Expenses:
Property operating costs	—			11,655			109,937			(9,475		)	112,117
Depreciation	—			6,744			54,083			—			60,827
Amortization	—			1,659			38,070			—			39,729
General and administrative	183			3,231			12,264			—			15,678
	183			23,289			214,354			(9,475		)	228,351
Real estate operating income/(loss)	(183		)	5,192			63,782			—			68,791
Other income (expense):
Interest expense	—			(29,254		)	(14,514		)	7,290			(36,478		)
Other income/(expense)	—			4,469			2,759			(7,290		)	(62		)
Equity in income of unconsolidated joint ventures	—			118			—			—			118
Gain on sale of real estate assets, net	—			6,434			5			—			6,439
Net income/(loss)	(183		)	(13,041		)	52,032			—			38,808
Plus: Net loss applicable to noncontrolling interest	—			—			6			—			6
Net income/(loss) applicable to Piedmont	$	(183	)	$	(13,041	)	$	52,038		$	—		$	38,814

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Consolidating Statements of Comprehensive Income
For the Three Months Ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors		Eliminations			Piedmont (Consolidated)
Net income	$	10,942		$	12,314		$	23,271	$	(35,585	)	$	10,942
Effective portion of gain on derivative instruments that are designated and qualify as cash flow hedges	1,747			1,747			—		(1,747		)	1,747
Plus: Reclassification of gain included in net income	(245		)	(245		)	—		245			(245		)
Other comprehensive income	1,502			1,502			—		(1,502		)	1,502
Comprehensive income	$	12,444		$	13,816		$	23,271	$	(37,087	)	$	12,444

Consolidating Statements of Comprehensive Income
For the Six Months Ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations			Piedmont (Consolidated)
Net income	$	68,772	$	69,247	$	91,937	$	(161,184	)	$	68,772
Effective portion of gain on derivatives instruments that are designated and qualify as cash flow hedges	3,264		3,264		—		(3,264		)	3,264
Plus: Reclassification of net loss included in net income	807		807		—		(807		)	807
Other comprehensive income	4,071		4,071		—		(4,071		)	4,071
Comprehensive income	$	72,843	$	73,318	$	91,937	$	(165,255	)	$	72,843

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Condensed Consolidating Statements of Cash Flows
For the six months ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Piedmont (Consolidated)
Net Cash Provided by Operating Activities	$	71,842		$	73,022		$	99,557		$	(161,176	)	$	83,245
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	—			(3,159		)	(51,493		)	—			(54,652		)
Intercompany note receivable	—			88,000			—			(88,000		)	—
Net sales proceeds from wholly-owned properties	—			36,572			382,985			—			419,557
Note receivable issuance	—			—			(3,200		)	—			(3,200		)
Deferred lease costs paid	—			(20		)	(10,199		)	—			(10,219		)
Distributions from subsidiaries	353,518			64,863			—			(418,381		)	—
Net cash provided by investing activities	353,518			186,256			318,093			(506,381		)	351,486
Cash Flows from Financing Activities:
Debt issuance costs paid	—			(248		)	—			—			(248		)
Proceeds from debt	—			773,225			—			—			773,225
Repayments of debt	—			(780,000		)	(721		)	—			(780,721		)
Intercompany note payable	—			—			(88,000		)	88,000			—
Value of shares withheld to pay tax obligations related to employee stock compensation	(2,213		)	—			—			—			(2,213		)
Repurchases of common stock as part of announced plan	(266,062		)	—			—			—			(266,062		)
Distributions	(157,085		)	(250,818		)	(328,762		)	579,557			(157,108		)
Net cash used in financing activities	(425,360		)	(257,841		)	(417,483		)	667,557			(433,127		)
Net increase in cash, cash equivalents, and restricted cash and escrows	—			1,437			167			—			1,604
Cash, cash equivalents, and restricted cash and escrows, beginning of period	150			3,906			4,699			—			8,755
Cash, cash equivalents, and restricted cash and escrows, end of period	$	150		$	5,343		$	4,866		$	—		$	10,359

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Condensed Consolidating Statements of Cash Flows
For the six months ended June 30, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations		Piedmont (Consolidated)
Net Cash Provided by/(Used in) Operating Activities	$	3,091		$	(10,029	)	$	118,678		$	—	$	111,740
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	—			(757		)	(57,563		)	—		(58,320		)
Investments in unconsolidated joint ventures	—			(284		)	—			—		(284		)
Net sales proceeds from wholly-owned properties	—			23,032			(9		)	—		23,023
Deferred lease costs paid	—			(736		)	(8,827		)	—		(9,563		)
Net cash provided by/(used in) investing activities	—			21,255			(66,399		)	—		(45,144		)
Cash Flows from Financing Activities:
Debt issuance costs paid	—			(102		)	—			—		(102		)
Proceeds from debt	—			147,000			—			—		147,000
Repayments of debt	—			(115,000		)	(694		)	—		(115,694		)
Costs of issuance of common stock	(74		)	—			—			—		(74		)
Value of shares withheld to pay tax obligations related to employee stock compensation	(3,380		)	—			—			—		(3,380		)
(Distributions to)/repayments from affiliates	92,020			(41,618		)	(50,402		)	—		—
Dividends paid and discount on dividend reinvestments	(91,657		)	—			(7		)	—		(91,664		)
Net cash used in financing activities	(3,091		)	(9,720		)	(51,103		)	—		(63,914		)
Net increase in cash, cash equivalents, and restricted cash and escrows	—			1,506			1,176			—		2,682
Cash, cash equivalents, and restricted cash and escrows, beginning of period	150			3,693			4,361			—		8,204
Cash, cash equivalents, and restricted cash and escrows, end of period	$	150		$	5,199		$	5,537		$	—	$	10,886

14.Subsequent Events

Third Quarter Dividend Declaration

On August 1, 2018, the Board of Directors of Piedmont declared dividends for the third quarter 2018 in the amount of $0.21 per common share outstanding to stockholders of record as of the close of business on August 31, 2018. Such dividends are to be paid on September 21, 2018.

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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,” "we," "our," or "us"). See also “Cautionary Note Regarding Forward-Looking Statements” preceding Part I, as well as the consolidated financial statements and accompanying notes thereto 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, 2017.

Liquidity and Capital Resources

We intend to use cash flows generated from the operation of our properties, proceeds from selective property dispositions, and proceeds from our $500 Million Unsecured 2015 Line of Credit as our primary sources of immediate liquidity. As of the filing date, we have $263.0 million of unused capacity under our line of credit. When necessary, we may renew and extend our line of credit, and seek secured or unsecured borrowings from third party lenders or issue securities as additional sources of capital. The availability and attractiveness of terms for these additional sources of capital will be highly dependent on market conditions at the time.

Our most consistent use of capital has historically been, and we believe will continue to be, to fund capital expenditures for our existing portfolio of properties. During the six months endedJune 30, 2018 and 2017 we incurred the following types of capital expenditures (in thousands):

	Six Months Ended
	June 30, 2018		June 30, 2017
Capital expenditures for new development	$	5	$	4,516
Capital expenditures for redevelopment/renovations	4,151		653
Capital expenditures previously credited as part of property acquisition	—		9,187
Other capital expenditures, including building and tenant improvements	22,320		43,964
Total capital expenditures(1)	$	26,476	$	58,320

⁽¹⁾  Of the total amounts paid, approximately $0.8 million and $0.2 million relates to soft costs such as capitalized interest, payroll, and other general and administrative expenses for the six months endedJune 30, 2018 and 2017, respectively.

"Capital expenditures for new development" relate to new office development projects. During the six months ended June 30, 2017, such expenditures primarily related to the construction of 500 TownPark, our now complete, approximately 134,000 square foot, 100% leased, four-story office building located adjacent to our existing 400 TownPark building in Lake Mary, Florida.

"Capital expenditures for redevelopment/renovations" during the six months ended June 30, 2018 relate to the redevelopment project to upgrade amenities and parking at our Two Pierce Place building in Itasca, Illinois, while such expenditures during the six months ended June 30, 2017 related to a now-complete redevelopment project that converted our 3100 Clarendon Boulevard building in Arlington, Virginia from governmental use into Class A private sector office space.

"Other capital expenditures" include all other capital expenditures during the period and are typically comprised of tenant and building improvements necessary to lease, maintain, or provide enhancements to our existing portfolio of office properties.

We classify our tenant and building improvements into two categories: (i) improvements which maintain the building's existing asset value and its revenue generating capacity (“non-incremental capital expenditures”) and (ii) improvements which incrementally enhance the building's asset value by expanding its revenue generating capacity (“incremental capital expenditures”). As of June 30, 2018, commitments for funding non-incremental capital expenditures for tenant improvements over the next five years related to our existing lease portfolio total approximately $40.0 million. The timing of the funding of these commitments is largely dependent upon tenant requests for reimbursement; however, we anticipate that a significant portion of these improvement allowances may be requested over the next three years based on when the underlying 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 executed leases totaled approximately $11.8 million as of June 30, 2018.

For example, for leases executed during the six months endedJune 30, 2018, we committed to spend approximately $4.48 per square foot per year of lease term for tenant improvement allowances and lease commissions (net of expiring lease commitments),

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and for those executed during the six months endedJune 30, 2017, we committed to spend approximately $4.89 per square foot per year of lease term for tenant improvement allowances and lease commissions (net of expiring lease commitments). In addition to the amounts described above that we have already committed to as a part of executed leases, we anticipate continuing to incur similar market-based tenant improvement allowances and leasing commissions in conjunction with procuring future leases for our existing portfolio of properties, including recently completed development and redevelopment projects. Given that our operating model frequently results in leases for large blocks of space to credit-worthy tenants, our leasing success can result in significant capital outlays. Both the timing and magnitude of expenditures related to future leasing activity are highly dependent on the competitive market conditions at the time of lease negotiations of the particular office market within which a given lease is signed.

There are other uses of capital that may arise as part of our typical operations. Subject to the identification and availability of attractive investment opportunities and our ability to consummate such acquisitions on satisfactory terms, acquiring new assets compatible with our investment strategy could also be a significant use of capital. Further, we may continue to use capital resources to repurchase additional shares of our common stock under our stock repurchase program. As of June 30, 2018, we had approximately $123.5 million of board-authorized capacity remaining for future stock repurchases. Finally, other than our $500 Million Unsecured 2015 Line of Credit (which can be extended to 2020), we have no scheduled debt maturities until 2020; however, on a longer term basis we expect to use capital to repay debt obligations when they become due.

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, development projects, and selective acquisitions of new properties; (iv) the timing of significant expenditures for tenant improvements, building redevelopment projects, 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. With 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

Net income applicable to common stockholders for the three months ended June 30, 2018 was $10.9 million, or $0.09 per diluted share, as compared with net income of $23.7 million, or $0.16 per diluted share, for the three months ended June 30, 2017. The three months ended June 30, 2017 included an approximately $6.5 million, or $0.04 per diluted share, gain on sale compared to de minimis gain/loss activity in the second quarter of the current year. The remaining decrease is primarily attributable to the sale of sixteen wholly-owned assets and one unconsolidated joint venture since June of 2017. These decreases were partially offset on a per share basis by a 17.1 million share decrease in our weighted average shares outstanding as a result of stock repurchases made pursuant to our stock repurchase program during the twelve months ended June 30, 2018.

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Comparison of the three months endedJune 30, 2018 versus the three months endedJune 30, 2017

Income from Continuing Operations

The following table sets forth selected data from our consolidated statements of income for the three months endedJune 30, 2018 and 2017, respectively, as well as each balance as a percentage of total revenues for the same periods presented (dollars in millions):

	June 30, 2018			% of Revenues		June 30, 2017			% of Revenues		Variance
Revenue:
Rental income	$	101.5				$	118.5				$	(17.0	)
Tenant reimbursements	22.0					24.3					(2.3		)
Property management fee revenue	0.4					0.4					—
Other property related income	5.3					5.5					(0.2		)
Total revenues	129.2			100	%	148.7			100	%	(19.5		)
Expense:
Property operating costs	52.6			41	%	56.3			38	%	(3.7		)
Depreciation	27.1			21	%	30.1			20	%	(3.0		)
Amortization	15.3			12	%	19.3			13	%	(4.0		)
General and administrative	8.3			6	%	7.5			5	%	0.8
Real estate operating income	25.9			20	%	35.5			24	%	(9.6		)
Other income (expense):
Interest expense	(15.7		)	12	%	(18.4		)	12	%	2.7
Other income/(expense)	0.7			—	%	—			—	%	0.7
Equity in income of unconsolidated joint ventures	—			—	%	0.1			—	%	(0.1		)
Gain on sale of real estate assets, net	—			—	%	6.5			4	%	(6.5		)
Net income	$	10.9		8	%	$	23.7		16	%	$	(12.8	)

Revenue

Rental income decreased approximately $17.0 million for the three months endedJune 30, 2018, as compared to the same period in the prior year. Substantially all of the decrease was attributable to net disposition activity subsequent to June 30, 2017.

Tenant reimbursements decreased approximately $2.3 million for the three months endedJune 30, 2018 as compared to the same period in the prior year, primarily due to net disposition activity subsequent to June 30, 2017, which contributed approximately $3.2 million to the decrease. This decrease was partially offset by higher recoveries related to increased property taxes at certain of our existing properties.

Expense

Property operating costs decreased approximately $3.7 million for the three months endedJune 30, 2018 compared to the same period in the prior year, primarily due to net disposition activity subsequent to June 30, 2017, which contributed approximately $6.9 million to the decrease. Higher property operating costs, primarily recoverable property tax expense at certain of our existing properties, partially offset this decrease.

Depreciation expense decreased approximately $3.0 million for the three months endedJune 30, 2018 compared to the same period in the prior year. Approximately $3.8 million of the decrease was attributable to net disposition activity subsequent to June 30, 2017. This decrease was partially offset by depreciation on additional building and tenant improvements placed in service subsequent to April 1, 2017 across our portfolio of properties.

Amortization expense decreased approximately $4.0 million for the three months endedJune 30, 2018 compared to the same period in the prior year. The decrease is attributable to certain lease intangible assets at our existing properties either becoming fully amortized subsequent to April 1, 2017, or sold as part of our net disposition activity.

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General and administrative expenses increased approximately $0.8 million for the three months endedJune 30, 2018 compared to the same period in the prior year primarily due to increased accruals for potential performance-based stock compensation of approximately $1.3 million. This increase was partially offset by a decrease in our state and local tax expenses at certain of our properties.

Other Income (Expense)

Interest expense decreased approximately $2.7 million for the three months endedJune 30, 2018 as compared to the same period in the prior year. The decrease is mainly attributable to lower average debt outstanding in the current period, specifically due to the repayment of loans subsequent to June 30, 2017, including the $140 million of secured debt on our 1201 and 1225 Eye Street buildings in Washington, D.C. and two of our unsecured term loans comprising a total of $470 million, offset partially by interest expense on a new $250 million seven-year term loan.

Other income/(expense) increased approximately $0.7 million for the three months endedJune 30, 2018 as compared to the same period in the prior year due mainly to the sale of Solar Renewable Energy Certificates ("SRECs") to a third-party, as well as interest and fee income for the administration of certain debt instruments.

Gain on sale of real estate assets, net, during the three months endedJune 30, 2017 represent the gain recognized on the sale of the Sarasota Commerce Center II building located in Sarasota, Florida.

Comparison of the accompanying consolidated statements of income for the six months endedJune 30, 2018 versus the six months endedJune 30, 2017

Income from Continuing Operations

The following table sets forth selected data from our consolidated statements of income for the six months endedJune 30, 2018 and 2017, respectively, as well as each balance as a percentage of total revenues for the same period presented (dollars in millions):

	June 30, 2018			% of Revenues		June 30, 2017			% of Revenues		Variance
Revenue:
Rental income	$	202.9				$	236.5				$	(33.6	)
Tenant reimbursements	45.1					49.1					(4.0		)
Property management fee revenue	0.7					0.9					(0.2		)
Other rental income	10.4					10.6					(0.2		)
Total revenues	259.1			100	%	297.1			100	%	(38.0		)
Expense:
Property operating costs	104.5			40	%	112.1			38	%	(7.6		)
Depreciation	54.3			21	%	60.8			21	%	(6.5		)
Amortization	32.0			12	%	39.7			13	%	(7.7		)
General and administrative	14.8			6	%	15.7			5	%	(0.9		)
Real estate operating income	53.5			21	%	68.8			23	%	(15.3		)
Other income (expense):
Interest expense	(29.4		)	11	%	(36.5		)	12	%	7.1
Other income/(expense)	1.2			—	%	—			—	%	1.2
Equity in income of unconsolidated joint ventures	—			—	%	0.1			—	%	(0.1		)
Loss on extinguishment of debt	(1.7		)	—	%	—			—	%	(1.7		)
Gain on sale of real estate assets, net	45.2			17	%	6.4			2	%	38.8
Net income	$	68.8		27	%	$	38.8		13	%	$	30.0

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Revenue

Rental income decreased approximately $33.6 million for the six months endedJune 30, 2018 as compared to the same period in the prior year. Substantially all of the decrease is attributable to net property disposition activity subsequent to January 1, 2017.

Tenant reimbursements decreased approximately $4.0 million for the six months endedJune 30, 2018 as compared to the same period in the prior year. Net disposition activity subsequent to January 1, 2017 contributed approximately $5.9 million to the decrease. However, this variance was partially offset due to the expiration of abatements, and an increase in recoverable operating expenses at certain of our existing properties.

Expense

Property operating costs decreased approximately $7.6 million for the six months endedJune 30, 2018 as compared to the same period in the prior year, primarily due to net disposition activity subsequent to January 1, 2017 which contributed approximately $13.4 million to the decrease. This decrease was partially offset by higher property operating costs, primarily recoverable property tax expense at certain of our existing properties.

Depreciation expense decreased approximately $6.5 million for the six months endedJune 30, 2018 as compared to the same period in the prior year. Approximately $8.5 million of the decrease was attributable to net disposition activity subsequent to January 1, 2017. This decrease was offset by depreciation on additional building and tenant improvements placed in service subsequent to January 1, 2017 across our portfolio of properties.

Amortization expense decreased approximately $7.7 million for the six months endedJune 30, 2018 as compared to the same period in the prior year. The decrease is attributable to certain lease intangible assets at our existing properties either becoming fully amortized subsequent to January 1, 2017, or sold as part of our net disposition activity.

General and administrative expenses decreased approximately $0.9 million for the six months endedJune 30, 2018 as compared to the same period in the prior year, primarily due to decreased year-to-date accruals for potential performance-based stock compensation.

Other Income (Expense)

Interest expense decreased approximately $7.1 million for the six months endedJune 30, 2018 as compared to the same period in the prior year. The decrease is mainly attributable to lower average debt outstanding in the current period, specifically due to the repayment of debt subsequent to January 1, 2017, including the $140 million of secured debt on our 1201 and 1225 Eye Street buildings in Washington, D.C. and two of our unsecured term loans comprising a total of $470 million, offset partially by a new $250 million seven-year term loan.

Other income/(expense) increased approximately $1.2 million for the six months endedJune 30, 2018 as compared to the same period in the prior year due to the sale of SRECs to a third-party, as well as interest and fee income for the administration of certain debt instruments.

The loss on extinguishment of debt is associated with the early repayment of our $170 Million Unsecured 2015 Term Loan and our $300 Million Unsecured 2013 Term Loan. The loss includes the write-off of unamortized debt issuance costs, discounts, and costs related to the termination of interest rate swap agreements associated with the debt.

Gain on sale of real estate assets, net, during the six months endedJune 30, 2018 represents the gain recognized on the sale of the 2017 Disposition Portfolio comprised of 14 properties in various markets that closed in January 2018. Gain on sale of real estate assets, net, during the six months endedJune 30, 2017 represent the gain recognized on the sale of the Sarasota Commerce Center II building located in Sarasota, Florida.

Funds From Operations ("FFO"), Core Funds From Operations ("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. These metrics 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

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historical cost accounting to be insufficient by themselves. As a result, we believe that the additive 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 National Association of Real Estate Investment Trusts ("NAREIT") definition. NAREIT currently defines FFO 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). Other REITs may not define FFO in accordance with the 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 by starting with FFO, as defined by NAREIT, and adjusting for gains or losses on the extinguishment of swaps and/or debt, acquisition-related expenses, and any significant non-recurring or infrequent items. Core FFO is a non-GAAP financial measure and should not be viewed as an alternative to net income calculated in accordance with GAAP as a measurement of our operating performance. We believe that Core FFO is helpful to investors as a supplemental performance measure because it excludes the effects of certain items which can create significant earnings volatility, but which do not directly relate to our core recurring business operations. As a result, we believe that Core FFO can help facilitate comparisons of operating performance between periods and provides a more meaningful predictor of future earnings potential. Other REITs may not define Core FFO in the same manner as us; therefore, our computation of Core FFO may not be comparable to that of other REITs.

We calculate AFFO by starting with Core FFO and adjusting for non-incremental capital expenditures and acquisition-related costs and then adding back non-cash items including: non-real estate depreciation, straight-line rent adjustments and fair value lease adjustments, non-cash components of interest expense and compensation expense, and by making similar adjustments for unconsolidated partnerships and joint ventures. AFFO is a non-GAAP financial measure and should not be viewed as an alternative to net income calculated in accordance with GAAP as a measurement of our operating performance. We believe that AFFO is helpful to investors as a meaningful supplemental comparative performance measure of our ability to make incremental capital investments. Other REITs may not define AFFO in the same manner as us; therefore, our computation of AFFO may not be comparable to that of other REITs.

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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											Six Months Ended
	June 30, 2018			Per Share(1)		June 30, 2017			Per Share(1)			June 30, 2018			Per Share(1)			June 30, 2017			Per Share(1)
GAAP net income applicable to common stock	$	10,942		$	0.09	$	23,710		$	0.16		$	68,772		$	0.52		$	38,814		$	0.27
Depreciation of real estate assets (2)	26,894			0.21		29,932			0.21			53,863			0.41			60,561			0.41
Amortization of lease-related costs (2)	15,229			0.11		19,315			0.13			31,945			0.24			39,721			0.27
(Gain)/loss on sale - wholly-owned properties, net	23			—		(6,492		)	(0.04		)	(45,186		)	(0.34		)	(6,439		)	(0.04		)
NAREIT Funds From Operations applicable to common stock	$	53,088		$	0.41	$	66,465		$	0.46		$	109,394		$	0.83		$	132,657		$	0.91
Adjustments:
Acquisition costs	—			—		—			—			—			—			6			—
Loss on extinguishment of debt	—			—		—			—			1,680			0.01			—			—
Core Funds From Operations applicable to common stock	$	53,088		$	0.41	$	66,465		$	0.46		$	111,074		$	0.84		$	132,663		$	0.91
Adjustments:
Amortization of debt issuance costs, fair market value adjustments on notes payable, and discount on debt	545					628						1,011						1,258
Depreciation of non real estate assets	213					184						382						379
Straight-line effects of lease revenue (2)	(4,806		)			(6,634		)				(8,279		)				(12,337		)
Stock-based and other non-cash compensation	2,513					911						2,801						2,952
Net effect of amortization of above and below-market in-place lease intangibles	(1,987		)			(1,611		)				(3,630		)				(3,170		)
Acquisition costs	—					—						—						(6		)
Non-incremental capital expenditures (3)	(10,178		)			(9,073		)				(18,131		)				(16,745		)
Adjusted Funds From Operations applicable to common stock	$	39,388				$	50,870					$	85,228					$	104,994
Weighted-average shares outstanding – diluted	128,701					145,813						132,432						145,780
Common stock issued and outstanding as of period end	128,371					145,490						128,371						145,490

⁽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⁾  We define 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 enhance the rental rates of a building or change the property's underlying classification, such as from a Class B to a Class A property, are excluded from this measure.

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Property and Same Store Net Operating Income

Property Net Operating Income ("Property NOI") is a non-GAAP measure which we use to assess our operating results. We calculate Property NOI beginning with Net income (computed in accordance with GAAP) before interest, taxes, depreciation and amortization and incrementally removing any impairment losses, gains or losses from sales of property and other significant infrequent items that create volatility within our earnings and make it difficult to determine the earnings generated by our core ongoing business. Furthermore, we adjust for general and administrative expense, income associated with property management performed by us for other organizations, and other income or expense items such as interest income from loan investments or costs from the pursuit of non-consummated transactions. For Property NOI (cash basis), the effects of straight-lined rents and fair value lease revenue are also eliminated; while such effects are not adjusted in calculating Property NOI (accrual basis). Property NOI is a non-GAAP financial measure and should not be viewed as an alternative to net income calculated in accordance with GAAP as a measurement of our operating performance. We believe that Property NOI, on either a cash or accrual basis, is helpful to investors as a supplemental comparative performance measure of income generated by our properties alone without our administrative overhead. Other REITs may not define Property NOI in the same manner as we do; therefore, our computation of Property NOI may not be comparable to that of other REITs.

We calculate Same Store Net Operating Income ("Same Store NOI") as Property NOI applicable to the properties owned or placed in service during the entire span of the current and prior year reporting periods. Same Store NOI also excludes amounts applicable to unconsolidated joint venture assets. Same Store NOI is a non-GAAP financial measure and should not be viewed as an alternative to net income calculated in accordance with GAAP as a measurement of our operating performance. We believe that Same Store NOI, on either a cash or accrual basis is helpful to investors as a supplemental comparative performance measure of the income generated from the same group of properties from one period to the next. Other REITs may not define Same Store NOI in the same manner as we do; therefore, our computation of Same Store NOI may not be comparable to that of other REITs.

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The following table sets forth a reconciliation from net income calculated in accordance with GAAP to Property NOI, on both a cash and accrual basis, and Same Store NOI, on both a cash and accrual basis, for the three months endedJune 30, 2018 and 2017, respectively (in thousands):

	Cash Basis						Accrual Basis
	Three Months Ended						Three Months Ended
	June 30, 2018			June 30, 2017			June 30, 2018			June 30, 2017
Net income applicable to Piedmont (GAAP basis)	$	10,942		$	23,710		$	10,942		$	23,710
Net income applicable to noncontrolling interest	(2		)	(3		)	(2		)	(3		)
Interest expense	15,687			18,421			15,687			18,421
Depreciation (1)	27,107			30,116			27,107			30,116
Amortization (1)	15,229			19,315			15,229			19,315
Net recoveries from casualty events	—			(26		)	—			(26		)
(Gain)/loss on sale of real estate assets, net (1)	23			(6,492		)	23			(6,492		)
General & administrative expenses(1)	8,258			7,551			8,258			7,551
Management fee revenue	(200		)	(180		)	(200		)	(180		)
Other income(1)	(157		)	(12		)	(157		)	(12		)
Straight-line rent effects of lease revenue(1)	(4,806		)	(6,634		)
Amortization of lease-related intangibles(1)	(1,987		)	(1,611		)
Property NOI	$	70,094		$	84,155		$	76,887		$	92,400
Net operating income from:
Acquisitions(2)	(917		)	—			(1,270		)	—
Dispositions(3)	(205		)	(15,486		)	(205		)	(14,269		)
Other investments(4)	(920		)	(2,171		)	(1,044		)	(2,555		)
Same Store NOI	$	68,052		$	66,498		$	74,368		$	75,576
Change period over period in Same Store NOI	2.3		%	N/A			(1.6		)%	N/A

⁽¹⁾  Includes amounts applicable to consolidated properties and our proportionate share of amounts applicable to unconsolidated joint ventures.

⁽²⁾  Acquisitions consist of Norman Pointe I in Bloomington, Minnesota, purchased on December 28, 2017; and 501 West Church Street in Orlando, Florida, purchased on February 23, 2018.

⁽³⁾  Dispositions consist of Sarasota Commerce Center II in Sarasota, Florida, sold on June 16, 2017; Two Independence Square in Washington, D.C., sold on July 5, 2017; and the 14-property portfolio sale completed on January 4, 2018.

⁽⁴⁾  Other investments consist of our interests in unconsolidated joint ventures, active redevelopment and development projects, land, and recently completed redevelopment and development projects for which some portion of operating expenses were capitalized during the current and/or prior year reporting periods. The operating results from 500 TownPark in Lake Mary, Florida, and Two Pierce Place in Itasca, Illinois, are included in this line item.

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The following table sets forth a reconciliation from net income calculated in accordance with GAAP to Property NOI, on both a cash and accrual basis, and Same Store NOI, on both a cash and accrual basis, for the six months endedJune 30, 2018 and 2017, respectively (in thousands):

	Cash Basis						Accrual Basis
	Six Months Ended						Six Months Ended
	June 30, 2018			June 30, 2017			June 30, 2018			June 30, 2017
Net income applicable to Piedmont (GAAP basis)	$	68,772		$	38,814		$	68,772		$	38,814
Net loss applicable to noncontrolling interest	(4		)	(6		)	(4		)	(6		)
Interest expense	29,445			36,478			29,445			36,478
Loss on extinguishment of debt	1,680			—			1,680			—
Depreciation (1)	54,246			60,940			54,246			60,940
Amortization (1)	31,945			39,721			31,945			39,721
Acquisition costs	—			6			—			6
Net loss from casualty events	—			32			—			32
Gain on sale of real estate assets, net (1)	(45,186		)	(6,439		)	(45,186		)	(6,439		)
General & administrative expenses (1)	14,810			15,706			14,810			15,706
Management fee revenue	(349		)	(510		)	(349		)	(510		)
Other (income)/expense (1)	(388		)	25			(388		)	25
Straight-line rent effects of lease revenue (1)	(8,279		)	(12,337		)
Amortization of lease-related intangibles (1)	(3,630		)	(3,170		)
Property NOI	$	143,062		$	169,260		$	154,971		$	184,767
Net operating income from:
Acquisitions (2)	(1,583		)	—			(2,132		)	—
Dispositions (3)	(387		)	(31,076		)	(378		)	(28,656		)
Other investments (4)	(2,437		)	(3,937		)	(2,482		)	(4,778		)
Same Store NOI	$	138,655		$	134,247		$	149,979		$	151,333
Change period over period in Same Store NOI	3.3		%	N/A			(0.9		)%	N/A

⁽¹⁾  Includes amounts applicable to consolidated properties and our proportionate share of amounts applicable to unconsolidated joint ventures.

⁽²⁾  Acquisitions consist of Norman Pointe I in Bloomington, Minnesota, purchased on December 28, 2017; and 501 West Church Street in Orlando, Florida, purchased on February 23, 2018.

⁽³⁾  Dispositions consist of Sarasota Commerce Center II in Sarasota, Florida, sold on June 16, 2017; Two Independence Square in Washington, D.C., sold on July 5, 2017; and the 14-property portfolio sale completed on January 4, 2018.

⁽⁴⁾  Other investments consist of our interests in unconsolidated joint ventures, active redevelopment and development projects, land, and recently completed redevelopment and development projects for which some portion of operating expenses were capitalized during the current and/or prior year reporting periods. The operating results from 500 TownPark in Lake Mary, Florida, and Two Pierce Place in Itasca, Illinois, are included in this line item.

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Overview

Our portfolio is a diverse geographical portfolio primarily located in select sub-markets within eight major office markets located in the Eastern-half of the United States. We typically lease space to large, credit-worthy corporate or governmental tenants on a long-term basis. As of June 30, 2018, our average lease was almost 20,000 square feet with approximately seven years of lease term remaining. Consequently, leased percentage, as well as rent roll ups and roll downs, which we experience as a result of re-leasing, can fluctuate widely between buildings and between tenants, depending on when a particular lease is scheduled to commence or expire.

Leased Percentage

Our current in-service portfolio of 53 office properties was 90.6% leased as of June 30, 2018 and scheduled lease expirations for the portfolio as a whole for the remainder of 2018 and 2019 were 1.8% and 12.0%, respectively, of our ALR. To the extent new leases for currently vacant space outweigh or fall short of scheduled expirations, such leases would increase or decrease our leased percentage, respectively. Our leased percentage may also fluctuate from the impact of occupancy levels associated with our net acquisition and disposition activity.

Impact of Downtime, Abatement Periods, and Rental Rate Changes

Commencement of new leases typically occurs 6-18 months after the lease execution date, after refurbishment of the space is completed. The downtime between a lease expiration and the new lease's commencement can negatively impact Property NOI and Same Store NOI comparisons (both accrual and cash basis). In addition, office leases, both new and lease renewals, often contain upfront rental and/or operating expense abatement periods which delay the cash flow benefits of the lease even after the new lease or renewal has commenced and will continue to negatively impact Property NOI and Same Store NOI on a cash basis until such abatements expire. As of June 30, 2018, we had approximately 285,000 square feet of executed leases related to currently vacant space that had not yet commenced and approximately 747,000 square feet of commenced leases that were in some form of rental and/or operating expense abatement.

If we are unable to replace expiring leases with new or renewal leases at rental rates equal to or greater than the expiring rates, rental rate roll downs could occur and negatively impact Property NOI and Same Store NOI comparisons. As mentioned above, our geographically diverse portfolio and the magnitude of some of our tenant's leased space can result in rent roll ups and roll downs that can fluctuate widely on a building-by-building and a quarter-to-quarter basis.

Same Store NOI increased 3.3% on a cash basis and decreased 0.9% accrual basis, respectively, during the six months endedJune 30, 2018, as compared to the same period in the prior year. The increase in cash basis Same Store NOI is primarily the result of the expiration of rental abatements associated with new leases; whereas the decrease in accrual basis Same Store NOI is due primarily to downtime between lease expirations and new lease commencements, specifically for one large lease at our 6011 Connection Drive property in Dallas, Texas during the quarter. Property NOI and Same Store NOI comparisons for any given period may still fluctuate as a result of the mix of net leasing activity in individual properties during the respective period.

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 POH, a wholly-owned subsidiary of Piedmont, as a taxable REIT subsidiary. POH performs 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 20% of the value of our total assets.

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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 reimbursements on a per square-foot basis, or in some cases, annual reimbursement of operating expenses above certain per square-foot allowances. 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. As of June 30, 2018, we had no off-balance sheet arrangements. For further information regarding our commitments under our debt 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. Refer to our Annual Report on Form 10-K for the year ended December 31, 2017 for a discussion of our critical accounting policies. There have been no material changes to these policies during the six months ended June 30, 2018.

Accounting Pronouncements Adopted during the Six Months Ended June 30, 2018

Revenue Recognition

On January 1, 2018, we adopted Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09") and Accounting Standards Update No. 2016-08, Revenue from Contracts with Customers (Topic 606) Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ("ASU 2016-08") issued by the Financial Accounting Standards Board (the "FASB"). The amendments in ASU 2014-09, which are further clarified in ASU 2016-08, as well as Accounting Standards Update 2016-10, Accounting Standards Update 2016-12, and Accounting Standards Update 2016-20 (collectively the "Revenue Recognition Amendments") change the criteria for the recognition of certain revenue streams to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services using a five-step determination process.

Our revenues which are included in the scope of the Revenue Recognition Amendments include our property management fee revenue, the majority of our parking revenue, as well as certain license agreements which allow third-parties to place their antennas or fiber-optic cabling on or inside our buildings. Lease contracts are specifically excluded from the Revenue Recognition Amendments and, we intend to utilize a leasing practical expedient, which has been tentatively approved by the FASB, to group certain non-lease components related to operating expense reimbursements with other leasing components, provided they meet certain criteria. Because the timing and pattern of transfer of our non-lease related revenue already followed the prescribed method of the Revenue Recognition Amendments, we were able to effectively adopt these amendments on a full retrospective basis, with no impact to the timing of recognition of the related revenue; however, such non-lease revenues are now being presented as "Other property related income" in the accompanying consolidated statements of income. Further, for comparative purposes, we reclassified approximately $5.5 million and $10.6 million of parking, antennae license, and fiber income that was previously included in rental income into other property related income, as well as certain other miscellaneous revenue into tenant reimbursements and/or property management fee revenue during the three and six months endedJune 30, 2017, respectively. We did not elect to adopt any practical expedients provided by the Revenue Recognition Amendments. For further details, see Note 2 to our accompanying consolidated financial statements.

Gain/(loss) on Sale of Real Estate Assets

On January 1, 2018, we adopted Accounting Standards Update No. 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting

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for Partial Sales of Nonfinancial Assets ("ASU 2017-05") concurrent with the Revenue Recognition Amendments mentioned above. We elected to apply the amendments of ASU 2017-05 on a full retrospective basis; however, there were no adjustments to previously recorded gains/(losses) on sale of real estate as a result of the transition.

Equity Investments Held in Non-qualified Deferred Compensation Plan

On January 1, 2018, we adopted Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), as well as Accounting Standards Update No. 2018-03 Technical Corrections and Improvements to Financial Instruments-Overall (Subtopic 825-10) ("ASU 2018-03"). These amendments require equity investments, except those accounted for under the equity method of accounting, to be measured at estimated fair value with changes in fair value recognized in net income. Investments in trading securities held in a "rabbi trust" by us are the only securities affected by ASU 2016-01 and ASU 2018-03. As such, we have made a cumulative-effect adjustment to our consolidated balance sheet and consolidated statements of stockholders' equity of approximately $0.1 million from other comprehensive income to cumulative distributions in excess of earnings, and have recorded changes in fair value in net income for the three and six months ended June 30, 2018 related to these investment securities.

Interest Rate Derivatives

On January 1, 2018, we early adopted Accounting Standards Update No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12").We adopted ASU 2017-12 using the modified retrospective transition method; however, no adjustment was necessary to account for the cumulative effect of the change on the opening balance of each affected component of equity in the consolidated balance sheet as of the date of adoption because there was no cumulative ineffectiveness that had been recorded on our existing interest rate swaps as of December 31, 2017, and all other trades were perfectly effective. The amended presentation and disclosure guidance which is required to be presented prospectively is provided inNote 6 to our accompanying consolidated financial statements.

Other Recent Accounting Pronouncements

The FASB has issued Accounting Standards Update No. 2016-02, Leases (Topic 842) ("ASU 2016-02"), which fundamentally changes the definition of a lease, as well as the accounting for operating leases by requiring lessees to recognize assets and liabilities which arise from the lease, consisting of a liability to make lease payments (the lease liability) and a right-of-use asset, representing the right to use the leased asset over the term of the lease. Accounting for leases by lessors is substantially unchanged from prior practice as lessors will continue to recognize lease revenue on a straight-line basis. Additionally, Accounting Standards Update No. 2018-11 Leases (Topic 842) Targeted Improvements ("ASU 2018-11") issued by the FASB allows certain non-lease operating expense reimbursements to be accounted for as part of the lease provided certain criteria are met under an optional practical expedient. Further, the FASB has issued Accounting Standards Update No. 2018-01 Leases (Topic 842) Land Easement Practical Expedient for Transition to Topic 842 ("ASU 2018-01"). The amendments to ASU No. 2018-01 clarify that a land easement is required to be evaluated to determine whether it should be accounted for as a lease upon adoption of ASU 2016-02, and provides an optional practical transition expedient allowing entities not currently assessing land easements under existing leasing guidance prior to adoption of ASU 2016-02 to not apply the new guidance to land easements existing at the date of initial adoption of ASU 2016-02. The amendments in ASU 2016-02, ASU 2018-01, and ASU 2018-11 are effective in the first quarter of 2019. Although management continues to evaluate the guidance and disclosures required by these amendents, we do not anticipate any material impact to our consolidated financial statements as a result of adoption related to lessor accounting. However, we do expect to record a right-to-use asset and related liability under lessee accounting, and we are still evaluating the potential impact of such lessee accounting.

The FASB has issued Accounting Standards Update No. 2018-07, Stock Compensation (Topic 718), Improvements to NonEmployee Share-Based Payment Accounting ("ASU 2018-07"). The provisions of ASU 2018-07 align accounting for stock based compensation for non-employees for goods and services with existing accounting for similar compensation for employees. The amendments supersede previous guidance on accounting for share-based payments to non-employees codified in the FASB's Accounting Standards Codification ("ASC") 505-50. ASU 2018-07 is effective in the first quarter of 2019, with early adoption permitted at any time provided that the entity has already adopted the provisions of ASC 606. We do not anticipate any material impact to our consolidated financial statements as a result of adoption.

The FASB has issued Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses (Topic 326),Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). The provisions of ASU 2016-13 replace the "incurred loss" approach with an "expected loss" model for impairing trade and other receivables, held-to-maturity debt securities, net investment in leases, and off-balance-sheet credit exposures, which will generally result in earlier recognition of allowances for credit losses. Additionally, the provisions change the classification of credit losses related to available-for-sale securities to an allowance, rather

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than a direct reduction of the amortized cost of the securities. ASU 2016-13 is effective in the first quarter of 2020, with early adoption permitted as of January 1, 2019. We are currently evaluating the potential impact of adoption.

Related-Party Transactions and Agreements

There were no related-party transactions during the three and six months endedJune 30, 2018.

Contractual Obligations

We have had significant changes to our debt structure during the six months ended June 30, 2018. As such, our contractual obligations related to long-term debt as of June 30, 2018 were 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)	$	1,728,195	$	238,907	(2)	$	302,145	(3)	$	537,143	$	650,000	(4)

⁽¹⁾  Amounts include principal payments only and balances outstanding as of June 30, 2018, not including unamortized issuance discounts, debt issuance costs paid to lenders, or estimated fair value adjustments. We made interest payments, including payments under our interest rate swaps, of approximately $30.7 million during the six months endedJune 30, 2018, and expect to pay interest in future periods on outstanding debt obligations based on the rates and terms disclosed herein and in Note 4 to our accompanying consolidated financial statements.

⁽²⁾  Includes the balance outstanding as of June 30, 2018 of the $500 Million Unsecured 2015 Line of Credit. However, we may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided we are not then in default and upon payment of extension fees.

⁽³⁾  Includes the $300 Million Unsecured 2011 Term Loan which has a stated variable rate; however, we have entered into interest rate swap agreements which effectively fix, exclusive of changes to our credit rating, the rate on this facility to 3.35% through maturity. As such, we estimate incurring, exclusive of changes to our credit rating, approximately $10.1 million per annum in total interest (comprised of combination of variable contractual rate and settlements under interest rate swap agreements) through maturity in January 2020.

⁽⁴⁾  Includes the $250 Million Unsecured 2018 Term Loan, which has a stated variable rate; however, we entered into $100 million in notional amount of seven-year interest rate swap agreements and $50 million in notional amount of two-year interest rate swap agreements, resulting in an effectively fixed interest rate on $150 million of the term loan at 4.11% through March 29, 2020 and on $100 million of the term loan at 4.21% from March 30, 2020 through the loan's maturity date of March 31, 2025, assuming no change in our credit rating. For the portion of the $250 Million Unsecured 2018 Term Loan that continues to have a variable interest rate, we may select from multiple interest rate options, including the prime rate and various length LIBOR locks. All LIBOR selections are subject to an additional spread (1.60% as of March 31, 2018) over the selected interest rate based on our then current credit rating.

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; and

• Contingencies Related to Tenant Audits/Disputes.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Our future income, cash flows, and estimated 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. Our potential for exposure to market risk includes interest rate fluctuations in connection with borrowings under our $500 Million Unsecured 2015 Line of Credit, our $300 Million Unsecured 2011 Term Loan, and the $250 Million Unsecured 2018 Term Loan. 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, all of our debt other than the $500 Million Unsecured 2015 Line of Credit and $100 million of our $250 Million Unsecured 2018 Term Loan is based on fixed or effectively-fixed interest rates to hedge against volatility in the credit markets.

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We do not enter into derivative or interest rate transactions for speculative purposes, as such all of our debt and derivative instruments were entered into for other than trading purposes. The estimated fair value of our debt was approximately $1.7 billion and $1.8 billion as of June 30, 2018 and December 31, 2017, respectively. Our interest rate swap agreements in place at June 30, 2018 and December 31, 2017 carried a notional amount totaling $450 million and $600 million with a weighted-average fixed interest rate (not including the corporate credit spread) of 2.30% and 1.89% , respectively.

As of June 30, 2018, our total outstanding debt subject to fixed, or effectively fixed, interest rates has an average effective interest rate of approximately 3.82% per annum with expirations ranging from 2020 to 2025. A change in the market interest rate impacts the net financial instrument position of our fixed-rate debt portfolio but has no impact on interest incurred or cash flows.

As of June 30, 2018, we had $238 million outstanding on our $500 Million Unsecured 2015 Line of Credit. Our $500 Million Unsecured 2015 Line of Credit currently has a stated rate of LIBOR plus 1.00% per annum (based on our current corporate credit rating) or the prime rate, at our discretion, resulting in an total interest rate of 3.08%. The current stated interest rate spread on $100 million of the $250 Million Unsecured 2018 Term Loan that is not effectively fixed through interest rate swaps is LIBOR plus 1.60% (based on our current corporate credit rating), which, as of June 30, 2018, results in a total interest rate of 3.69%. To the extent that we borrow additional funds in the future under the $500 Million Unsecured 2015 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 our existing outstanding borrowings as of June 30, 2018 would increase interest expense approximately $3.4 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 June 30, 2018 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 not subject to any material pending legal proceedings. However, we are subject to routine litigation arising in the ordinary course of owning and operating real estate assets. Our management expects that these ordinary routine legal proceedings will be covered by insurance and does not expect these legal proceedings to have a material adverse effect on our financial condition, results of operations, or liquidity. Additionally, management is not aware of any legal proceedings against Piedmont contemplated by governmental authorities.

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, 2017.

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

(a) There were no unregistered sales of equity securities during the second quarter 2018.

(b) Not applicable.

(c) During the three months ended June 30, 2018, we repurchased shares of our common stock in the open market in order to reissue such shares under our dividend reinvestment plan (the "DRP"), as well as repurchasing and retiring shares as part of our stock repurchase plan.

Of the 1,941,555 shares repurchased during the second quarter 2018, 1,860,393 shares (at an average price of $17.67 per share) related to repurchases of our common stock pursuant to our stock repurchase plan, and 81,162 shares (at an average price of $19.06 per share) related to shares purchased by our transfer agent on the open market and conveyed to participants in the DRP cumulatively for the second quarter 2018 dividend (paid on June 15, 2018). The aggregate stock repurchases for the quarter ended June 30, 2018 are as follows:

Period	Total Number of Shares Purchased (in thousands)	Average Price Paid per Share		Total Number of Shares  Purchased as Part of Publicly Announced Plan (in thousands) (1)	Maximum Approximate Dollar Value of Shares Available That May Yet Be Purchased Under the Plan (in thousands)
April 1, 2018 to April 30, 2018	1,861	$	17.67	1,861	$	123,464
May 1, 2018 to May 31, 2018	—	$	—	—	$	123,464
June 1, 2018 to June 30, 2018 (2)	81	$	19.06	—	$	123,464	(1)
Total	1,942	$	17.73	1,861

⁽¹⁾  Amounts available for purchase relate only to our stock repurchase plan, which was previously re-authorized on February 21, 2018 by the Board of Directors of Piedmont to permit the purchase of shares of common stock having an aggregate purchase price of up to $200 million between February 21, 2018 and February 21, 2020. As of June 30, 2018, we have $123.5 million of availability remaining under our current authorization to repurchase shares of our common stock through February 21, 2020. The share repurchase plan is separate from shares purchased for DRP issuance.

⁽²⁾  Under our amended and restated DRP, as set forth in a 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.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

Not applicable.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

49

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

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	Articles Supplementary to the Third Articles of Amendment and Restatement of the Company, as supplemented and amended (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K, filed on November 14, 2016)
3.5	Articles of Amendment of the Company effective May 22, 2018 (incorporated by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed on May 23, 2018)
3.6	Amended and Restated Bylaws of the Company (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K, filed on May 9, 2017)
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
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

50

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:	August 1, 2018	By:	/s/ Robert E. Bowers
			Robert E. Bowers
			Chief Financial Officer and Executive Vice President
			(Principal Financial Officer and Duly Authorized Officer)

51

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 June 30, 2018 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: August 1, 2018

By:	/s/ Donald A. Miller, CFA
	Donald A. Miller, CFA
	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 June 30, 2018 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: August 1, 2018

By:	/s/ Robert E. Bowers
	Robert E. Bowers
	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 June 30, 2018, 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
	August 1, 2018

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 June 30, 2018, 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
	August 1, 2018

XML

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
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	Jun. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		128,370,913

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Real estate assets, at cost:
Land	$ 547,602	$ 544,794
Buildings and improvements, less accumulated depreciation of $831,692 and $785,206 as of June 30, 2018 and December 31, 2017, respectively	2,409,749	2,418,023
Intangible lease assets, less accumulated amortization of $79,934 and $99,145 as of June 30, 2018 and December 31, 2017, respectively	70,271	77,805
Construction in progress	17,831	11,710
Real estate assets held for sale, net	0	332,410
Total real estate assets	3,045,453	3,384,742
Amounts due from unconsolidated joint ventures	0	10
Cash and cash equivalents	8,944	7,382
Tenant receivables, net of allowance for doubtful accounts of $597 and $539 as of June 30, 2018 and December 31, 2017, respectively	9,323	12,139
Straight-line rent receivables	172,164	163,160
Note receivable	3,200	0
Restricted cash and escrows	1,415	1,373
Prepaid expenses and other assets	29,180	22,517
Goodwill	98,918	98,918
Interest rate swaps	2,679	688
Deferred lease costs, less accumulated amortization of $169,256 and $183,740 as of June 30, 2018 and December 31, 2017, respectively	252,714	261,907
Other assets held for sale, net	0	47,131
Total assets	3,623,990	3,999,967
Liabilities:
Unsecured debt, net of discount and unamortized debt issuance costs of $8,144 and $7,689 as of June 30, 2018 and December 31, 2017, respectively	1,529,856	1,535,311
Secured debt, net of premiums and unamortized debt issuance costs of $795 and $946 as of June 30, 2018 and December 31, 2017, respectively	190,990	191,616
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	94,215	216,653
Deferred income	25,532	29,582
Intangible lease liabilities, less accumulated amortization of $54,540 and $55,847 as of June 30, 2018 and December 31, 2017, respectively	40,341	38,458
Interest rate swaps	0	1,478
Other liabilities held for sale, net	0	380
Total liabilities	1,880,934	2,013,478
Commitments and Contingencies
Stockholders’ Equity:
Shares-in-trust, 150,000,000 shares authorized; none outstanding as of June 30, 2018 or December 31, 2017	0	0
Preferred stock, no par value, 100,000,000 shares authorized; none outstanding as of June 30, 2018 or December 31, 2017	0	0
Common stock, $.01 par value, 750,000,000 shares authorized; 128,370,913 and 142,358,940 shares issued and outstanding as of June 30, 2018 and December 31, 2017, respectively	1,284	1,424
Additional paid-in capital	3,681,127	3,677,360
Cumulative distributions in excess of earnings	(1,953,291)	(1,702,281)
Other comprehensive income	12,141	8,164
Piedmont stockholders’ equity	1,741,261	1,984,667
Noncontrolling interest	1,795	1,822
Total stockholders’ equity	1,743,056	1,986,489
Total liabilities and stockholders’ equity	$ 3,623,990	$ 3,999,967

XML

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets:
Intangible lease assets, accumulated amortization	$ 79,934	$ 99,145
Tenant receivables, allowance for doubtful accounts	597	539
Deferred lease costs, accumulated amortization	169,256	183,740
Liabilities:
Intangible lease liabilities, accumulated amortization	$ 54,540	$ 55,847
Stockholders’ Equity:
Shares-in-trust, shares authorized (in shares)	150,000,000	150,000,000
Shares-in-trust, shares outstanding (in shares)	0	0
Preferred stock, par value (in dollars per share)	$ 0	$ 0
Preferred stock, shares authorized (in shares)	100,000,000	100,000,000
Preferred stock, shares outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	750,000,000	750,000,000
Common stock, shares issued (in shares)	128,370,913	142,358,940
Common stock, shares outstanding (in shares)	128,370,913	142,358,940
Unsecured Debt
Liabilities:
Discount, (premiums) and unamortized debt issuance costs	$ 8,144	$ 7,689
Secured Debt
Liabilities:
Discount, (premiums) and unamortized debt issuance costs	(795)	(946)
Building and improvements
Assets:
Buildings and improvements, accumulated depreciation	$ 831,692	$ 785,206

XML

Consolidated Statements of Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenues:
Rental income	$ 101,478	$ 118,492	$ 202,932	$ 236,531
Tenant reimbursements	22,047	24,285	45,041	49,122
Property management fee revenue	382	400	691	925
Other property related income	5,267	5,502	10,410	10,564
Total revenues	129,174	148,679	259,074	297,142
Expenses:
Property operating costs	52,637	56,287	104,496	112,117
Depreciation	27,115	30,059	54,260	60,827
Amortization	15,245	19,314	31,978	39,729
General and administrative	8,258	7,528	14,810	15,678
Operating expenses	103,255	113,188	205,544	228,351
Real estate operating income	25,919	35,491	53,530	68,791
Other income (expense):
Interest expense	(15,687)	(18,421)	(29,445)	(36,478)
Other income/(expense)	731	38	1,177	(62)
Equity in income of unconsolidated joint ventures	0	107	0	118
Loss on extinguishment of debt	0	0	(1,680)	0
Gain/(loss) on sale of real estate assets, net	(23)	6,492	45,186	6,439
Net income	10,940	23,707	68,768	38,808
Plus: Net loss applicable to noncontrolling interest	2	3	4	6
Net income applicable to Piedmont	$ 10,942	$ 23,710	$ 68,772	$ 38,814
Per share information – basic and diluted:
Net income applicable to common stockholders (in usd per share)	$ 0.09	$ 0.16	$ 0.52	$ 0.27
Weighted-average common shares outstanding – basic (in shares)	128,346,433	145,412,524	132,090,741	145,350,074
Weighted-average common shares outstanding – diluted (in shares)	128,700,743	145,813,130	132,431,642	145,779,709

XML

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income applicable to Piedmont	$ 10,942	$ 23,710	$ 68,772	$ 38,814
Other comprehensive income:
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 6)	1,747	(911)	3,264	132
Plus: Reclassification of net (gain)/loss included in net income (See Note 6)	(245)	977	807	2,283
Gain on investment in available for sale securities	0	15	0	28
Other comprehensive income	1,502	81	4,071	2,443
Comprehensive income applicable to Piedmont	$ 12,444	$ 23,791	$ 72,843	$ 41,257

XML

Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Cumulative Distributions in Excess of Earnings	Other Comprehensive Income/(Loss)	Non- controlling Interest
Balance at Dec. 31, 2016	$ 2,097,703	$ 1,452	$ 3,673,128	$ (1,580,863)	$ 2,104	$ 1,882
Balance (in shares) at Dec. 31, 2016		145,235,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Plus: Net loss applicable to noncontrolling interest	6
Net income applicable to Piedmont	38,814
Other comprehensive income	$ 2,443
Balance (in shares) at Jun. 30, 2017	145,490,000
Balance at Dec. 31, 2016	$ 2,097,703	$ 1,452	3,673,128	(1,580,863)	2,104	1,882
Balance (in shares) at Dec. 31, 2016		145,235,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share repurchases as part of an announced plan	(61,750)	$ (31)		(61,719)
Share repurchases as part of an announced plan (in shares)		(3,133,000)
Offering costs	(182)		(182)
Dividends to common stockholders, stockholders of subsidiaries, and dividends reinvested	(193,541)		(233)	(193,263)		(45)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	4,650	$ 3	4,647
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		257,000
Plus: Net loss applicable to noncontrolling interest	(15)					(15)
Net income applicable to Piedmont	133,564			133,564
Other comprehensive income	6,060				6,060
Balance at Dec. 31, 2017	$ 1,986,489	$ 1,424	3,677,360	(1,702,281)	8,164	1,822
Balance (in shares) at Dec. 31, 2017	142,358,940	142,359,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative effect of accounting change (adoption of ASU 2016-01)	$ 0			94	(94)
Share repurchases as part of an announced plan	(264,785)	$ (143)		(264,642)
Share repurchases as part of an announced plan (in shares)		(14,343,000)
Dividends to common stockholders, stockholders of subsidiaries, and dividends reinvested	(55,308)		(51)	(55,234)		(23)
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax	3,821	$ 3	3,818
Shares issued and amortized under the 2007 Omnibus Incentive Plan, net of tax (in shares)		355,000
Plus: Net loss applicable to noncontrolling interest	4					4
Net income applicable to Piedmont	68,772			68,772
Other comprehensive income	4,071				4,071
Balance at Jun. 30, 2018	$ 1,743,056	$ 1,284	$ 3,681,127	$ (1,953,291)	$ 12,141	$ 1,795
Balance (in shares) at Jun. 30, 2018	128,370,913	128,371,000

XML

Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Dividends to common stockholders per share (in USD per share)	$ 0.42	$ 1.34

XML

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows from Operating Activities:
Net income	$ 68,768	$ 38,808
Operating distributions received from unconsolidated joint ventures	10	0
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	54,260	60,827
Amortization of debt issuance costs and net settlement of interest rate swaps	(207)	810
Other amortization	29,061	39,034
Loss on extinguishment of debt	(1,665)	0
Stock compensation expense	5,004	5,403
Equity in income of unconsolidated joint ventures	0	(118)
Gain on sale of real estate assets, net	(45,186)	(6,439)
Changes in assets and liabilities:
Increase in tenant and straight-line rent receivables, net	(6,974)	(13,078)
Increase in prepaid expenses and other assets	(6,452)	(6,908)
Cash received upon settlement of interest rate swaps	807	0
Decrease in accounts payable and accrued expenses	(13,672)	(5,471)
Decrease in deferred income	(3,839)	(1,128)
Net cash provided by operating activities	83,245	111,740
Cash Flows from Investing Activities:
Acquisition of real estate assets, related intangibles, and cash held in escrow for acquisitions	(28,176)	0
Capitalized expenditures, net of accruals	(26,476)	(58,320)
Net sales proceeds from wholly-owned properties	419,557	23,023
Investments in unconsolidated joint ventures	0	(284)
Note receivable issuance	(3,200)	0
Deferred lease costs paid	(10,219)	(9,563)
Net cash provided by/(used in) investing activities	351,486	(45,144)
Cash Flows from Financing Activities:
Debt issuance costs paid	(248)	(102)
Proceeds from debt	773,225	147,000
Repayments of debt	(780,721)	(115,694)
Costs of issuance of common stock	0	74
Shares withheld for payment of taxes related to employee stock compensation	(2,213)	(3,380)
Repurchases of common stock as part of announced plan	(266,062)	0
Dividends paid and discount on dividend reinvestments	(157,108)	(91,664)
Net cash used in financing activities	(433,127)	(63,914)
Net increase in cash, cash equivalents, and restricted cash and escrows	1,604	2,682
Cash, cash equivalents, and restricted cash and escrows, beginning of period	8,755	8,204
Cash, cash equivalents, and restricted cash and escrows, end of period	$ 10,359	$ 10,886

XML

Organization

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization

Organization

Piedmont Office Realty Trust, Inc. (“Piedmont”) (NYSE: PDM) is a Maryland corporation that operates in a manner so as to qualify as a real estate investment trust (“REIT”) for federal income tax purposes and engages in the acquisition, development, management, and ownership of commercial real estate properties located primarily in the Eastern-half of the United States, including properties that are under construction, are newly constructed, or have operating histories. Piedmont was incorporated in 1997 and commenced operations in 1998. Piedmont conducts business primarily through Piedmont Operating Partnership, L.P. (“Piedmont OP”), a Delaware limited partnership, as well as performing the management of its buildings through two wholly-owned subsidiaries, Piedmont Government Services, LLC and Piedmont Office Management, LLC. Piedmont owns 99.9% of, and is the sole general partner of, Piedmont OP and as such, possesses full legal control and authority over the operations of Piedmont OP. The remaining 0.1% ownership interest of Piedmont OP is held indirectly by Piedmont through its wholly-owned subsidiary, Piedmont Office Holdings, Inc. ("POH"), the sole limited partner of Piedmont OP. Piedmont OP owns properties directly, through wholly-owned subsidiaries, and through various joint ventures which we control. References to Piedmont herein shall include Piedmont and all of its subsidiaries, including Piedmont OP and its subsidiaries and joint ventures.

As of June 30, 2018, Piedmont owned 53 in-service office properties and one redevelopment asset. As of June 30, 2018, Piedmont's 53 in-service office properties comprise approximately 16.2 million square feet of primarily Class A commercial office space and were approximately 90.6% leased. As of June 30, 2018, approximately 91% of Piedmont's Annualized Lease Revenue (unaudited) was generated from select sub-markets located primarily within eight major office markets located in the Eastern-half of the United States: Atlanta, Boston, Chicago, Dallas, Minneapolis, New York, Orlando, and Washington, D.C.

Piedmont internally evaluates all of its real estate assets as one operating segment, and accordingly does not report segment information.

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Summary of Significant Accounting Policies

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

Summary of Significant Accounting Policies

Basis of Presentation and Principles of Consolidation

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 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.

Piedmont’s consolidated financial statements include the accounts of Piedmont, Piedmont’s wholly-owned subsidiaries, any variable interest entity ("VIE") for which Piedmont or any of its wholly-owned subsidiaries is considered to have the power to direct the activities of the entity and the obligation to absorb losses/right to receive benefits, or any entity in which Piedmont or any of its wholly-owned subsidiaries owns a controlling interest. In determining whether Piedmont or Piedmont OP has a controlling interest, the following factors, among others, are considered: equity ownership, voting rights, protective rights of investors, and participatory rights of investors. 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, 2017.

All intercompany balances and transactions have been eliminated upon consolidation.

Further, Piedmont has formed special purpose entities to acquire and hold real estate. Each special purpose entity is a separate legal entity. Consequently, the assets of these special purpose entities are not available to all creditors of Piedmont. The assets owned by these special purpose entities are being reported on a consolidated basis with Piedmont’s assets for financial reporting purposes only.

Use of Estimates

The preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying consolidated financial statements and notes. Actual results could differ from those estimates.

Income Taxes

Piedmont has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended, and has operated as such, beginning with its taxable year ended December 31, 1998. To qualify as a REIT, Piedmont must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its annual REIT taxable income. As a REIT, Piedmont is generally not subject to federal income taxes, subject to fulfilling, among other things, its taxable income distribution requirement. Piedmont is subject to certain taxes related to the operations of properties in certain locations, as well as operations conducted by its taxable REIT subsidiary, POH, which have been provided for in the financial statements.

Tax Cuts and Jobs Act

The Tax Cuts and Jobs Act ("H.R. 1"), which generally took effect for taxable years that began on or after January 1, 2018 (subject to certain exceptions), made many significant changes to the U.S. federal income tax laws that will profoundly impact the taxation of individuals and corporations (including both regular C corporations and corporations that have elected to be taxed as REITs). For example, H.R. 1 limits the ability of corporations to utilize net operating loss carryforwards and limits the deductibility of business interest for all taxpayers, subject to an exception for taxpayers that are engaged in certain specified real property trades or business who make an irrevocable election not to apply the limitation to a particular real property trade or business and to depreciate their real property investments held in such trade or business using the less favorable alternative depreciation system. To date, the IRS has issued limited guidance with respect to certain of the provisions of H.R. 1, and there are numerous interpretive issues that will require guidance. In addition, changes made by H.R. 1 may require Piedmont to accrue certain income for U.S. federal income tax purposes no later than when such income is taken into account as revenue on its GAAP-based financial statements, unless the income is already subject to certain special methods of accounting under the Code. This could cause Piedmont to recognize taxable income prior to the receipt of the associated cash and accordingly, increase its distribution levels in order to maintain its status as a REIT. H.R. 1 also includes limitations on the deductibility of certain compensation paid to Piedmont's executives, certain interest payments, and certain net operating loss carryforwards, each of which could potentially increase Piedmont's taxable income and its required distributions. Piedmont recorded an approximate $0.2 million reduction to its tax liability related to its taxable REIT subsidiary as a result of the rate reduction included in H.R. 1 during the six months ended June 30, 2018. Although management is still evaluating the other effects of H.R. 1, Piedmont does not believe that H.R. 1 will significantly impact its financial statements.

Reclassifications

Certain prior period amounts presented in the accompanying consolidated statements of income have been reclassified to conform to the current period financial statement presentation. These amounts included: (i) the reclassification of approximately $5.5 million and $10.6 million for the three and six months endedJune 30, 2017, respectively, of parking, antennae license and fiber income that was previously included in rental income into other property related income, as well as certain other miscellaneous revenue into tenant reimbursements and/or property management fee revenue in conjunction with the adoption of the Revenue Recognition Amendments, as further defined and described below; and (ii) the reclassification of $0.5 million and $1.0 million for the three and six months endedJune 30, 2017, respectively, of expense related to certain regional employees who are primarily engaged in the operation and management of properties that was previously included in general and administrative expense to property operating costs.

Accounting Pronouncements Adopted during the Six Months Ended June 30, 2018

Revenue Recognition

On January 1, 2018, Piedmont adopted Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09") and Accounting Standards Update No. 2016-08, Revenue from Contracts with Customers (Topic 606) Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ("ASU 2016-08") issued by the Financial Accounting Standards Board (the "FASB"). The amendments in ASU 2014-09, which are further clarified in ASU 2016-08, as well as Accounting Standards Update 2016-10, Accounting Standards Update 2016-12, and Accounting Standards Update 2016-20 (collectively the "Revenue Recognition Amendments") change the criteria for the recognition of certain revenue streams to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services using a five-step determination process.

Piedmont's revenues which are included in the scope of the Revenue Recognition Amendments include its property management fee revenue, the majority of its parking revenue, as well as certain license agreements which allow third-parties to place their antennas or fiber-optic cabling on or inside Piedmont's buildings. Lease contracts are specifically excluded from the Revenue Recognition Amendments and, Piedmont intends to utilize a leasing practical expedient, which has been tentatively approved by the FASB, to group certain non-lease components related to operating expense reimbursements with other leasing components, provided they meet certain criteria. Because the timing and pattern of transfer of Piedmont's non-lease related revenue already followed the prescribed method of the Revenue Recognition Amendments, Piedmont was able to effectively adopt these amendments on a full retrospective basis, with no impact to the timing of recognition of the related revenue; however, such non-lease revenues are now being presented as "Other property related income" in the accompanying consolidated statements of income. Further, for comparative purposes, Piedmont reclassified approximately $5.5 million and $10.6 million for the three and six months endedJune 30, 2017, respectively, of parking, antennae license, and fiber income that was previously included in rental income into other property related income, as well as certain other miscellaneous revenue into tenant reimbursements and/or property management fee revenue. Piedmont did not elect to adopt any practical expedients provided by the Revenue Recognition Amendments.

A detail of Piedmont's total revenues for the three months ended June 30, 2018 and 2017 (after reclassifications as a result of the adoption of the Revenue Recognition Amendments), including a detailed description of each line item is as follows:

			(After Adoption of Revenue Recognition Amendments)
	Three Months Ended June 30, 2018		Three Months Ended June 30, 2017
Rental income	$	101,478	$	118,492
Tenant reimbursements	22,047		24,285
Property management fee revenue	382		400
Other property related income	5,267		5,502
Total revenues	$	129,174	$	148,679

Rental income- consists of revenue from leases with Piedmont's tenants, which is not within the scope of the Revenue Recognition Amendments.

Tenant reimbursements - consists of revenue derived from reimbursements for services prescribed by leases with Piedmont's tenants separate from, but in conjunction with, the revenue generated from leasing office space. Such income is not within the scope of the Revenue Recognition Amendments.

Property management fee revenue- consists of revenue earned by Piedmont related to operating and managing office properties owned by other third-parties. Such income is within the scope of the Revenue Recognition Amendments; however, because the property management services represent a performance obligation that would be satisfied over the length of the contract, not at any specific point in time, and has the same measure of transfer (time elapsed), property management fee revenue will be recognized over time, consistent with the timing of Piedmont’s historic recognition. Any variable consideration transferred as part of these management agreements will continue to be recognized in the quarter that the underlying cash receipts are collected, consistent with the allocation objective of allocating the transaction price in an amount that depicts the amount of consideration to which Piedmont expects to be entitled in exchange for transferring the promised service to the customer.

Other property related income - consists of all other property related income from Piedmont's customers (tenants) that is not derived from a contract meeting the definition of a lease. Examples of such income include parking revenue and income from licenses with unrelated third-parties to place antennae and/or fiber optic cables in or on Piedmont's buildings. Since these services are substantially the same and have the same pattern of transfer, there is no timing difference between the recognition of other property related income and the recognition of the underlying expense/delivery of “service” under the new Revenue Recognition Amendments. Additionally, no modification to the timing of Piedmont’s previous revenue recognition is necessary, as these items have been recognized historically in accordance with this pattern of transfer.

Gain/(loss) on Sale of Real Estate Assets

On January 1, 2018, Piedmont adopted Accounting Standards Update No. 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets ("ASU 2017-05") concurrent with the Revenue Recognition Amendments mentioned above. Piedmont elected to apply the amendments of ASU 2017-05 on a full retrospective basis; however, there were no adjustments to previously recorded gains/(losses) on sale of real estate as a result of the transition.

Equity Investments Held in Non-qualified Deferred Compensation Plan

On January 1, 2018, Piedmont adopted Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), as well as Accounting Standards Update No. 2018-03 Technical Corrections and Improvements to Financial Instruments-Overall (Subtopic 825-10) ("ASU 2018-03"). These amendments require equity investments, except those accounted for under the equity method of accounting, to be measured at estimated fair value with changes in fair value recognized in net income. Investments in trading securities held in a "rabbi trust" by Piedmont are the only securities affected by ASU 2016-01 and ASU 2018-03. As such, Piedmont has made a cumulative-effect adjustment to its consolidated balance sheet and consolidated statements of stockholders' equity of approximately $0.1 million from other comprehensive income to cumulative distributions in excess of earnings, and has recorded changes in fair value in net income for the three and six months endedJune 30, 2018 related to these investment securities.

Interest Rate Derivatives

On January 1, 2018, Piedmont early adopted Accounting Standards Update No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"). Piedmont adopted ASU 2017-12 using the modified retrospective transition method; however, no adjustment was necessary to account for the cumulative effect of the change on the opening balance of each affected component of equity in the consolidated balance sheet as of the date of adoption because there was no cumulative ineffectiveness that had been recorded on Piedmont's existing interest rate swaps as of December 31, 2017, and all other trades were perfectly effective. The amended presentation and disclosure guidance which is required to be presented prospectively is provided inNote 6.

Other Recent Accounting Pronouncements

The FASB has issued Accounting Standards Update No. 2016-02, Leases (Topic 842) ("ASU 2016-02"), which fundamentally changes the definition of a lease, as well as the accounting for operating leases by requiring lessees to recognize assets and liabilities which arise from the lease, consisting of a liability to make lease payments (the lease liability) and a right-of-use asset, representing the right to use the leased asset over the term of the lease. Accounting for leases by lessors is substantially unchanged from prior practice as lessors will continue to recognize lease revenue on a straight-line basis. Additionally, Accounting Standards Update No. 2018-11, Leases (Topic 842) Targeted Improvements ("ASU 2018-11") issued by the FASB allows certain non-lease operating expense reimbursements to be accounted for as part of the lease provided certain criteria are met under an optional practical expedient. Further, the FASB has issued Accounting Standards Update No. 2018-01 Leases (Topic 842) Land Easement Practical Expedient for Transition to Topic 842 ("ASU 2018-01"). The amendments to ASU No. 2018-01 clarify that a land easement is required to be evaluated to determine whether it should be accounted for as a lease upon adoption of ASU 2016-02, and provides an optional practical transition expedient allowing entities not currently assessing land easements under existing leasing guidance prior to adoption of ASU 2016-02 to not apply the new guidance to land easements existing at the date of initial adoption of ASU 2016-02. The amendments in ASU 2016-02, ASU 2018-01, and ASU 2018-11 are effective in the first quarter of 2019. Although management continues to evaluate the guidance and disclosures required by these amendments, Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption related to lessor accounting. However, Piedmont does expect to record a right-to-use asset and related liability under lessee accounting, and Piedmont is still evaluating the potential impact of such lessee accounting.

The FASB has issued Accounting Standards Update No. 2018-07, Stock Compensation (Topic 718), Improvements to NonEmployee Share-Based Payment Accounting ("ASU 2018-07"). The provisions of ASU 2018-07 align accounting for stock based compensation for non-employees for goods and services with existing accounting for similar compensation for employees. The amendments supersede previous guidance on accounting for share-based payments to non-employees codified in the FASB's Accounting Standards Codification ("ASC") 505-50. ASU 2018-07 is effective in the first quarter of 2019, with early adoption permitted at any time provided that the entity has already adopted the provisions of ASC 606. Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption.

The FASB has issued Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses (Topic 326),Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). The provisions of ASU 2016-13 replace the "incurred loss" approach with an "expected loss" model for impairing trade and other receivables, held-to-maturity debt securities, net investment in leases, and off-balance-sheet credit exposures, which will generally result in earlier recognition of allowances for credit losses. Additionally, the provisions change the classification of credit losses related to available-for-sale securities to an allowance, rather than a direct reduction of the amortized cost of the securities. ASU 2016-13 is effective in the first quarter of 2020, with early adoption permitted as of January 1, 2019. Piedmont is currently evaluating the potential impact of adoption.

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Acquisitions

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Acquisitions

Acquisitions

During the six months endedJune 30, 2018, Piedmont acquired one property using proceeds available as a result of dispositions (see Note 9) in January 2018 and cash on hand, as noted below:

Property	Metropolitan Statistical Area	Date of Acquisition	Ownership Percentage Acquired		Rentable Square Feet	Percentage Leased as of Acquisition		Net Contractual Purchase Price  (in millions)
501 West Church Street	Orlando, Florida	February 23, 2018	100	%	182,461	100	%	$	28.0

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Debt

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Debt

Debt

During the six months ended June 30, 2018, Piedmont fully repaid the balances of the $300 Million Unsecured 2013 Term Loan and the $170 Million Unsecured 2015 Term Loan using proceeds from the 2017 Disposition Portfolio (see Note 9) and cash on hand, as well as drawing on its $500 Million Unsecured 2015 Line of Credit. Further, Piedmont had net borrowings during the six months ended June 30, 2018 on its $500 Million Unsecured 2015 Line of Credit of approximately $215.0 million, which brought the outstanding balance on the $500 Million Unsecured 2015 Line of Credit to $238 million as of June 30, 2018.

Additionally during the six months ended June 30, 2018, Piedmont entered into a $250 million unsecured term loan facility (the “$250 Million Unsecured 2018 Term Loan”) with a consortium of lenders. The term of the $250 Million Unsecured 2018 Term Loan is seven years with a maturity date of March 31, 2025; however, Piedmont may prepay the $250 Million Unsecured 2018 Term Loan, in whole or in part, at any time after March 29, 2020 without premium or penalty. The proceeds of the $250 Million Unsecured 2018 Term Loan were used to reduce the outstanding balance under the $500 Million Unsecured 2015 Line of Credit on the date the proceeds were received.

The $250 Million Unsecured 2018 Term Loan has the option to bear interest at varying levels based on either (i) the London Interbank Offered Rate (“LIBOR”) for an interest period selected by Piedmont of one, two, three, or six months, or to the extent available from all lenders in each case, one year or periods of less than one month, or (ii) Base Rate, defined as the greater of the prime rate, the federal funds rate plus 0.5%, or LIBOR for a one-month period plus 1%; plus a stated interest rate spread based on the higher credit rating level issued for either Piedmont or Piedmont OP. The stated interest rate spread over LIBOR can vary from 1.45% to 2.40% based upon the then current credit rating of Piedmont or Piedmont OP, whichever is higher. As of June 30, 2018, the stated interest rate spread on the $250 Million Unsecured 2018 Term Loan was 1.60%.

Under the $250 Million Unsecured 2018 Term Loan, Piedmont is subject to certain financial covenants that require, among other things, the maintenance of an unencumbered interest coverage ratio of at least 1.75, an unencumbered leverage ratio of at least 1.60, a fixed charge coverage ratio of at least 1.50, a leverage ratio of no more than 0.60, and a secured debt ratio of no more than 0.40. In addition, Piedmont entered into three interest rate swap agreements for a total notional amount of $150 million which effectively fixed $150 million of the $250 Million Unsecured 2018 Term Loan at an interest rate of approximately 4.11%.

The following table summarizes the terms of Piedmont’s indebtedness outstanding as of June 30, 2018 and December 31, 2017 (in thousands):

Facility (1)	Stated Rate		Effective Rate (2)			Maturity		Amount Outstanding as of
								June 30, 2018		December 31, 2017
Secured (Fixed)
$35 Million Fixed-Rate Loan (3)	5.55	%	3.75	%		9/1/2021		$	30,195	$	30,670
$160 Million Fixed-Rate Loan (4)	3.48	%	3.58	%		7/5/2022		160,000		160,000
Net premium and unamortized debt issuance costs								795		946
Subtotal/Weighted Average (5)	3.81	%						190,990		191,616
Unsecured (Variable and Fixed)
$170 Million Unsecured 2015 Term Loan	LIBOR + 1.125%		2.54	%		5/15/2018		—		170,000
$300 Million Unsecured 2013 Term Loan	LIBOR + 1.20%		2.78	%	(7)	1/31/2019		—		300,000
$500 Million Unsecured 2015 Line of Credit (6)	LIBOR + 1.00%		3.08	%		6/18/2019	(8)	238,000		23,000
$300 Million Unsecured 2011 Term Loan	LIBOR +  1.15%		3.35	%	(7)	1/15/2020		300,000		300,000
$350 Million Senior Notes	3.40	%	3.43	%		6/01/2023		350,000		350,000
$400 Million Senior Notes	4.45	%	4.10	%		3/15/2024		400,000		400,000
$250 Million Unsecured 2018 Term Loan	LIBOR + 1.60%		3.95	%	(9)	3/31/2025		250,000		—
Discounts and unamortized debt issuance costs								(8,144)		(7,689)
Subtotal/Weighted Average (5)	3.70	%						1,529,856		1,535,311
Total/Weighted Average (5)	3.71	%						$	1,720,846	$	1,726,927

⁽¹⁾  Other than the $35 Million Fixed-Rate Loan, all of Piedmont’s outstanding debt as of June 30, 2018 and December 31, 2017 is interest-only.

⁽²⁾  Effective rate after consideration of settled or in-place interest rate swap agreements, issuance premiums/discounts, and/or fair market value adjustments upon assumption of debt.

⁽³⁾  Collateralized by the 5 Wall Street building in Burlington, Massachusetts.

⁽⁴⁾  Collateralized by the 1901 Market Street building in Philadelphia, Pennsylvania.

⁽⁵⁾  Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates as of June 30, 2018.

⁽⁶⁾  On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length LIBOR locks on all or a portion of the principal. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating.

⁽⁷⁾  The facility has a stated variable rate; however, Piedmont has entered into interest rate swap agreements which effectively fix, exclusive of changes in Piedmont's credit rating, the rate to that shown as the effective rate.

⁽⁸⁾  Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided Piedmont is not then in default and upon payment of extension fees.

⁽⁹⁾  The facility has a stated variable rate; however, Piedmont has entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, $150 million of the principal balance to 4.11% through March 29, 2020, and $100 million of the principal balance to 4.21% from March 30, 2020 through the maturity date of the loan. For the remaining variable portion of the loan, Piedmont may periodically select from multiple interest rate options, including the prime rate and various-length LIBOR locks on all or a portion of the principal. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating. The rate presented is the weighted-average rate for the effectively fixed and variable portions of the debt outstanding as of June 30, 2018.

Piedmont made interest payments on all debt facilities, including interest rate swap cash settlements, of approximately $14.8 million and $16.7 million for the three months endedJune 30, 2018 and 2017, respectively, and approximately $30.7 million and $36.0 million for the six months endedJune 30, 2018 and 2017, respectively. Also, Piedmont capitalized interest of approximately $346,000 and $35,000 for the three months endedJune 30, 2018 and 2017, respectively, and approximately $0.5 million and $0.1 million for the six months endedJune 30, 2018 and 2017, respectively. As of June 30, 2018, Piedmont believes it was in compliance with all financial covenants associated with its debt instruments. See Note 7 for a description of Piedmont’s estimated fair value of debt as of June 30, 2018.

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Variable Interest Entities

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [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 must consolidate the VIE. Each of the following VIEs has the sole purpose of holding land and office buildings and their resulting operations, and are classified in the accompanying consolidated balance sheets in the same manner as Piedmont’s wholly-owned properties.

A summary of Piedmont’s interests in its consolidated VIEs and their related carrying values as of June 30, 2018 and December 31, 2017 is as follows (net carrying amount in millions):

	Piedmont's %		Net Carrying Amount as of		Net Carrying Amount as of
Entity	Ownership of Entity	Related Building	June 30, 2018		December 31, 2017		Primary Beneficiary Considerations
1201 Eye Street N.W. Associates, LLC	98.6%	1201 Eye Street	$	87.5	$	81.1	In accordance with the partnership’s governing documents, Piedmont currently receives 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building.
1225 Eye Street N.W. Associates, LLC	98.1%	1225 Eye Street	$	64.5	$	65.2	In accordance with the partnership’s governing documents, Piedmont currently receives 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	$	256.5	$	263.2	The Omnibus Agreement with the previous owner includes equity participation rights upon sale of the property for the previous owner, if certain financial returns are achieved; however, Piedmont has sole decision making authority and is entitled to 100% of the economic benefits of the property until such returns are met.

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Derivative Instruments

6 Months Ended

Jun. 30, 2018

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 exchange of the underlying notional amount.

As of June 30, 2018, Piedmont was party to interest rate swap agreements, all of which are designated as effective cash flow hedges and fully hedge the variable cash flows covering the entire outstanding balance of the $300 Million Unsecured 2011 Term Loan, and $150 million of the $250 Million Unsecured 2018 Term Loan. The maximum length of time over which Piedmont is hedging its exposure to the variability in future cash flows for forecasted transactions is 81 months.

A detail of Piedmont’s interest rate derivatives outstanding as of June 30, 2018 is as follows:

Interest Rate Derivatives:	Number of Swap Agreements	Associated Debt Instrument	Total Notional Amount (in millions)		Effective Date	Maturity Date
Interest rate swaps	3	$300 Million Unsecured 2011 Term Loan	$	300	11/22/2016	1/15/2020
Interest rate swaps	2	$250 Million Unsecured 2018 Term Loan	$	100	3/29/2018	3/31/2025
Interest rate swaps	1	$250 Million Unsecured 2018 Term Loan	$	50	3/29/2018	3/29/2020
Total			$	450

Piedmont presents its interest rate derivatives on its consolidated balance sheets on a gross basis as interest rate swap assets and interest rate swap liabilities. A detail of Piedmont’s interest rate derivatives on a gross and net basis as of June 30, 2018 and December 31, 2017, respectively, is as follows (in thousands):

Interest rate swaps classified as:	June 30, 2018		December 31, 2017
Gross derivative assets	$	2,679	$	688
Gross derivative liabilities	—		(1,478		)
Net derivative asset/(liability)	$	2,679	$	(790	)

The gain/(loss) on Piedmont's interest rate derivatives, including previously settled forward swaps, that was recorded in OCI and the accompanying consolidated statements of income as a component of interest expense for the three and six months endedJune 30, 2018 and 2017, respectively, was as follows (in thousands):

	Three Months Ended					Six Months Ended
Interest Rate Swaps in Cash Flow Hedging Relationships	June 30, 2018		June 30, 2017			June 30, 2018			June 30, 2017
Amount of gain/(loss) recognized in OCI	$	1,747	$	(911	)	$	3,264		$	132
Amount of previously recorded gain/(loss) reclassified from OCI into Interest Expense	$	245	$	(977	)	$	451		$	(2,283	)
Amount of gain/(loss) recognized on derivatives reclassified from OCI into Loss on Extinguishment of Debt	$	—	$	—		$	(1,258	)	$	—
Total amount of Interest Expense presented in the consolidated statements of income	$	15,687	$	18,421		$	29,445		$	36,478
Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of income (1)	$	—	$	—		$	1,680		$	—

⁽¹⁾  Includes the write-off of approximately $0.4 million of discounts and unamortized debt issuance costs associated with the repayment of debt (see Note 4).

Piedmont estimates that approximately $2.8 million will be reclassified from OCI as a reduction of interest expense over the next twelve months. Piedmont recognized no hedge ineffectiveness on its cash flow hedges during the three and six months endedJune 30, 2018 and 2017, respectively.

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. Because all of Piedmont's interest rate swaps are in an asset position, if Piedmont were to breach any of the contractual provisions of the derivative contracts, the settlement of its obligations under the agreements would not result in a penalty as of June 30, 2018. 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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Fair Value Measurement of Financial Instruments

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement of Financial Instruments

Fair Value Measurement of Financial Instruments

Piedmont considers its cash and cash equivalents, tenant receivables, notes receivable, restricted cash and escrows, accounts payable and accrued expenses, interest rate swap agreements, and debt to meet the definition of financial instruments. The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of June 30, 2018 and December 31, 2017, respectively (in thousands):

	June 30, 2018					December 31, 2017
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)	$	8,944	$	8,944	Level 1	$	7,382	$	7,382	Level 1
Tenant receivables, net(1)	$	9,323	$	9,323	Level 1	$	12,139	$	12,139	Level 1
Notes receivable (1)	$	3,200	$	3,200	Level 1	$	—	$	—	Level 1
Restricted cash and escrows(1)	$	1,415	$	1,415	Level 1	$	1,373	$	1,373	Level 1
Interest rate swaps	$	2,679	$	2,679	Level 2	$	688	$	688	Level 2
Liabilities:
Accounts payable and accrued expenses(1)	$	11,000	$	11,000	Level 1	$	126,429	$	126,429	Level 1
Interest rate swaps	$	—	$	—	Level 2	$	1,478	$	1,478	Level 2
Debt, net	$	1,720,846	$	1,725,912	Level 2	$	1,726,927	$	1,759,905	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 June 30, 2018 and December 31, 2017; however, Piedmont's estimate of its estimated fair value is disclosed in the table above. Piedmont uses widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the debt facilities, including the period to maturity of each instrument, and uses observable market-based inputs for similar debt facilities which have transacted recently in the market. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). Scaling adjustments are made to these inputs to make them applicable to the remaining life of Piedmont's outstanding debt. Piedmont has not changed its valuation technique for estimating the fair value of its debt.

Piedmont’s interest rate swap agreements presented above, and further discussed in Note 6, are classified as “Interest rate swap” assets and liabilities in the accompanying consolidated balance sheets and were carried at estimated fair value as of June 30, 2018 and December 31, 2017. The valuation of these derivative instruments was determined using widely accepted valuation techniques including discounted cash flow analysis based on the contractual terms of the derivatives, including the period to maturity of each instrument, and uses observable market-based inputs, including interest rate curves and implied volatilities. Therefore, the estimated fair values determined are considered to be based on significant other observable inputs (Level 2). In addition, Piedmont considered both its own and the respective counterparties’ risk of nonperformance in determining the estimated fair value of its derivative financial instruments by estimating the current and potential future exposure under the derivative financial instruments that both Piedmont and the counterparties were at risk for as of the valuation date. The credit risk of Piedmont and its counterparties were factored into the calculation of the estimated fair value of the interest rate swaps; however, as of June 30, 2018 and December 31, 2017, this credit valuation adjustment did not comprise a material portion of the estimated fair value. Therefore, Piedmont believes that any unobservable inputs used to determine the estimated fair values of its derivative financial instruments are not significant to the fair value measurements in their entirety, and does not consider any of its derivative financial instruments to be Level 3 assets or liabilities.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Commitments Under Existing Lease Agreements

Under its existing lease agreements, Piedmont may be required to fund significant tenant improvements, leasing commissions, and building improvements. In addition, certain agreements contain provisions that require Piedmont to issue corporate or property guarantees to provide funding for capital improvements or other financial obligations. Piedmont classifies its capital improvements into two categories: (i) improvements which maintain the building's existing asset value and its revenue generating capacity (“non-incremental capital expenditures”) and (ii) improvements which incrementally enhance the building's asset value by expanding its revenue generating capacity (“incremental capital expenditures”). As of June 30, 2018, commitments to fund potential non-incremental capital expenditures over the next five years for tenant improvements totaled approximately $40.0 million related to Piedmont's existing lease portfolio over the respective lease terms, the majority of which Piedmont estimates may be required to be funded over the next three years based on when the underlying leases commence. For most of Piedmont’s leases, the timing of the actual funding of these tenant improvements is largely dependent upon tenant requests for reimbursement. In some cases, these obligations may expire with the leases without further recourse to Piedmont. As of June 30, 2018, commitments for incremental capital expenditures for tenant improvements associated with executed leases totaled approximately $11.8 million.

Contingencies Related to Tenant Audits/Disputes

Certain lease agreements include provisions that grant tenants the right to engage independent auditors to audit their annual operating expense reconciliations. Such audits may result in the re-interpretation of language in the lease agreements which could result in the refund of previously recognized tenant reimbursement revenues, resulting in financial loss to Piedmont. Piedmont recorded $0 and $20,000 of such reductions in reimbursement revenues related to such tenant audits/disputes during the three months endedJune 30, 2018 and 2017, respectively, and $0.4 million and $0.3 million of such reductions in reimbursement revenues related to such tenant audits/disputes during the six months endedJune 30, 2018 and 2017, respectively.

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Assets Held for Sale

6 Months Ended

Jun. 30, 2018

Discontinued Operations and Disposal Groups [Abstract]

Assets Held for Sale

Assets Held for Sale

As of June 30, 2018, no properties met the criteria for held for sale classification. However, during the six months endedJune 30, 2018, Piedmont sold a portfolio of 14 properties (the "2017 Disposition Portfolio"). As of December 31, 2017, the 2017 Disposition Portfolio met the criteria for held for sale classification, and such properties are shown as held for sale as of December 31, 2017 in the consolidated balance sheet. Details of assets held for sale as of June 30, 2018 and December 31, 2017 are presented below (in thousands):

	June 30, 2018		December 31, 2017
Real estate assets held for sale, net:
Land	$	—	$	74,498
Building and improvements, less accumulated depreciation of $0 and $169,116 as of June 30, 2018 and December 31, 2017, respectively	—		255,634
Construction in progress	—		2,278
Total real estate assets held for sale, net	$	—	$	332,410
Other assets held for sale, net:
Straight-line rent receivables	$	—	$	25,975
Prepaid expenses and other assets	—		328
Deferred lease costs, less accumulated amortization of $0 and $16,549 as of June 30, 2018 and December 31, 2017, respectively	—		20,828
Total other assets held for sale, net	$	—	$	47,131
Other liabilities held for sale, net:
Intangible lease liabilities, less accumulated amortization of $0 and $935 as of June 30, 2018 and December 31, 2017, respectively	$	—	$	380

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Stock Based Compensation

6 Months Ended

Jun. 30, 2018

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

Stock Based Compensation

Stock Based Compensation

The Compensation Committee of Piedmont's Board of Directors has periodically granted deferred stock awards to all of Piedmont's employees and independent directors. Employee awards typically vest ratably over a multi-year period and independent director awards vest over one year. Certain employees' long-term equity incentive program is split equally between the time-vested awards described above and a multi-year performance share program whereby the actual awards are contingent upon Piedmont's total stockholder return ("TSR") relative to a peer group's TSR. The peer group is predetermined by the Board of Directors. Any shares earned are awarded at the end of the multi-year performance period and vest upon award.

A rollforward of Piedmont's equity based award activity for the six months endedJune 30, 2018 is as follows:

	Shares		Weighted-Average Grant Date Fair Value
Unvested and Potential Stock Awards as of December 31, 2017	868,437		$	21.69
Deferred Stock Awards Granted	354,236		$	17.84
Increase in Estimated Potential Share Award	379,249		$	23.80
Performance Stock Awards Vested	(161,005	)	$	18.47
Deferred Stock Awards Vested	(331,195	)	$	19.21
Deferred Stock Awards Forfeited	(6,515	)	$	19.98
Unvested and Potential Stock Awards as of June 30, 2018	1,103,207		$	22.42

The following table provides additional information regarding stock award activity during the three and six months endedJune 30, 2018 and 2017, respectively (in thousands, except per share amounts):

	Three Months Ended				Six Months Ended
	June 30, 2018		June 30, 2017		June 30, 2018		June 30, 2017
Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period	$	17.84	$	21.38	$	17.84	$	21.38
Total Grant Date Fair Value of Deferred Stock Vested During the Period	$	5,639	$	5,551	$	6,363	$	5,841
Share-based Liability Awards Paid During the Period(1)	$	—	$	—	$	2,947	$	2,877

⁽¹⁾  Amounts reflect the issuance of performance share awards related to the 2014-16 and 2015-17 Performance Share Plans during the six months endedJune 30, 2018 and 2017, respectively.

A detail of Piedmont’s outstanding stock awards as of June 30, 2018 is as follows:

Date of grant	Type of Award	Net Shares Granted (1)	Grant Date Fair Value		Vesting Schedule	Unvested Shares
January 3, 2014	Deferred Stock Award	72,969	$	16.45	Of the shares granted, 20% vested or will vest on January 3, 2015, 2016, 2017, 2018, and 2019, respectively.	16,416
May 24, 2016	Deferred Stock Award	208,055	$	19.91	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 24, 2017, 2018, and 2019, respectively.	60,975
May 24, 2016	Fiscal Year 2016-2018 Performance Share Program	—	$	23.02	Shares awarded, if any, will vest immediately upon determination of award in 2019.	119,371	(2)
May 18, 2017	Deferred Stock Award	219,947	$	21.38	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 18, 2018, 2019, and 2020, respectively.	124,281
May 18, 2017	Fiscal Year 2017-2019 Performance Share Program	—	$	30.45	Shares awarded, if any, will vest immediately upon determination of award in 2020.	143,335	(2)
May 17, 2018	Deferred Stock Award-Board of Directors	31,388	$	17.84	Of the shares granted, 100% will vest by May 17, 2019.	31,388
May 17, 2018	Deferred Stock Award	302,865	$	17.84	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 17, 2019, 2020, and 2021, respectively.	241,409
May 17, 2018	Fiscal Year 2018-2020 Performance Share Program	—	$	23.52	Shares awarded, if any, will vest immediately upon determination of award in 2021.	366,032	(2)
Total						1,103,207

⁽¹⁾  Amounts reflect the total grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through June 30, 2018.

⁽²⁾  Estimated based on Piedmont's cumulative TSR for the respective performance period through June 30, 2018. Share estimates are subject to change in future periods based upon Piedmont's relative performance compared to its peers' total stockholder return.

During the three months endedJune 30, 2018 and 2017, Piedmont recognized approximately $4.0 million and $2.6 million of compensation expense related to stock awards, of which $2.6 million and $1.1 million is related to the amortization of unvested shares, respectively. During the six months endedJune 30, 2018 and 2017, Piedmont recognized approximately $5.0 million and $5.7 million of compensation expense related to stock awards, of which $3.9 million and $4.2 million is related to the amortization of unvested shares, respectively. During the six months endedJune 30, 2018, a net total of 354,526 shares were issued to employees. As of June 30, 2018, approximately $6.3 million of unrecognized compensation cost related to unvested deferred stock awards remained, which Piedmont will record in its consolidated statements of income over a weighted-average vesting period of approximately two years.

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Supplemental Disclosures for the Statement of Consolidated Cash Flows

6 Months Ended

Jun. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Supplemental Disclosures for the Statement of Consolidated Cash Flows

Supplemental Disclosures for the Statement of Consolidated Cash Flows

Certain noncash investing and financing activities for the six months endedJune 30, 2018 and 2017, (in thousands) are outlined below:

	Six Months Ended
	June 30, 2018			June 30, 2017
Accrued capital expenditures and deferred lease costs	$	8,920		$	9,417
Change in accrued dividends and discount on dividend reinvestments	$	(101,800	)	$	(30,532	)
Change in accrued share repurchases as part of an announced plan	$	(1,277	)	$	—

The following table provides a reconciliation of cash, cash equivalents, and restricted cash and escrows as reported, or previously reported, within the consolidated balance sheet to the consolidated statement of cash flows as of the six months endedJune 30, 2018 and 2017, respectively (in thousands).

	Six Months Ended
	June 30, 2018		June 30, 2017
Cash and cash equivalents, beginning of period	$	7,382	$	6,992
Restricted cash and escrows, beginning of period	1,373		1,212
Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, beginning of period	$	8,755	$	8,204
Cash and cash equivalents, end of period	$	8,944	$	9,596
Restricted cash and escrows, end of period	1,415		1,290
Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, end of period	$	10,359	$	10,886

Amounts in real estate tax and escrowed cash represent deposits which are required by Piedmont’s lenders under certain of its debt agreements to escrow amounts for the payment of real estate taxes, and other amounts escrowed, for instance, earnest money deposited for the purchase of a property. Security and utility deposit escrows represent the cash held for tenants and/or Piedmont for lease related deposits.

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Earnings Per Share

6 Months Ended

Jun. 30, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

There are no adjustments to “Net income applicable to Piedmont” 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 unvested deferred stock awards. Diluted weighted average number of common shares reflects the potential dilution under the treasury stock method that would occur if the remaining unvested deferred stock awards vested and resulted in additional common shares outstanding. Unvested deferred stock awards which are determined to be anti-dilutive are not included in the calculation of diluted weighted average common shares.

The following table reconciles the denominator for the basic and diluted earnings per share computations shown on the consolidated statements of income for the three and six months endedJune 30, 2018 and 2017, respectively (in thousands):

	Three Months Ended		Six Months Ended
	June 30, 2018	June 30, 2017	June 30, 2018	June 30, 2017
Weighted-average common shares – basic	128,346	145,413	132,091	145,350
Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards	355	400	341	430
Weighted-average common shares – diluted	128,701	145,813	132,432	145,780
Common stock issued and outstanding as of period end			128,371	145,490

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Guarantor and Non-Guarantor Financial Information

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Guarantor and Non-Guarantor Financial Information

Guarantor and Non-Guarantor Financial Information

The following condensed consolidating financial information for Piedmont (the "Parent", "Guarantor", and/or "Consolidated"), Piedmont OP (the "Issuer"), and the other directly and indirectly owned subsidiaries of Piedmont as the Guarantor (the "Non-Guarantors") is provided pursuant to the requirements of Rule 3-10 of Regulation S-X regarding financial statements of guarantors and issuers of guaranteed registered securities. The Issuer is a wholly-owned subsidiary of the Guarantor, and all guarantees by the Guarantor of securities issued by the Issuer are full and unconditional. The principal elimination entries relate to investments in subsidiaries and intercompany balances and transactions, including transactions with the Non-Guarantors.

Condensed Consolidating Balance Sheets
As of June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations			Piedmont (Consolidated)
Assets:
Real estate assets, at cost:
Land	$	—	$	36,094	$	511,508	$	—		$	547,602
Buildings and improvements, less accumulated depreciation	—		176,704		2,233,345		(300		)	2,409,749
Intangible lease assets, less accumulated amortization	—		—		70,271		—			70,271
Construction in progress	—		408		17,423		—			17,831
Total real estate assets	—		213,206		2,832,547		(300		)	3,045,453
Cash and cash equivalents	150		5,311		3,483		—			8,944
Tenant and straight-line rent receivables, net	—		15,467		166,020		—			181,487
Investment in subsidiaries	1,743,439		2,803,136		169		(4,546,744		)	—
Notes receivable	—		810		147,700		(145,310		)	3,200
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	77		7,020		26,205		(28		)	33,274
Goodwill	—		98,918		—		—			98,918
Deferred lease costs, net	—		15,530		237,184		—			252,714
Total assets	$	1,743,666	$	3,159,398	$	3,413,308	$	(4,692,382	)	$	3,623,990
Liabilities:
Debt, net	$	—	$	1,529,792	$	336,364	$	(145,310	)	$	1,720,846
Accounts payable, accrued expenses, and accrued capital expenditures	610		15,012		78,621		(28		)	94,215
Deferred income	—		2,185		23,347		—			25,532
Intangible lease liabilities, net	—		—		40,341		—			40,341
Total liabilities	610		1,546,989		478,673		(145,338		)	1,880,934
Equity:
Total stockholders’ equity	1,743,056		1,612,409		2,934,635		(4,547,044		)	1,743,056
Total liabilities and stockholders’ equity	$	1,743,666	$	3,159,398	$	3,413,308	$	(4,692,382	)	$	3,623,990

Condensed Consolidating Balance Sheets
As of December 31, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)		Non-Guarantors		Eliminations			Piedmont (Consolidated)
Assets:
Real estate assets, at cost:
Land	$	—		$	36,094	$	508,700	$	—		$	544,794
Buildings and improvements, less accumulated depreciation	—			180,886		2,237,437		(300		)	2,418,023
Intangible lease assets, less accumulated amortization	—			181		77,624		—			77,805
Construction in progress	—			85		11,625		—			11,710
Real estate assets held for sale, net	—			32,815		299,595		—			332,410
Total real estate assets	—			250,061		3,134,981		(300		)	3,384,742
Cash and cash equivalents	150			3,890		3,342		—			7,382
Tenant and straight-line rent receivables, net, and amounts due from unconsolidated joint ventures	—			16,891		158,418		—			175,309
Advances to affiliates	1,674,276			6,297,632		—		(7,971,908		)	—
Investment in subsidiary	3,437,299			—		172		(3,437,471		)	—
Notes receivable	—			88,810		144,500		(233,310		)	—
Prepaid expenses, restricted cash, escrows, interest rate swaps and other assets	2			5,094		20,222		(740		)	24,578
Goodwill	—			98,918		—		—			98,918
Deferred lease costs, net	—			16,611		245,296		—			261,907
Other assets held for sale, net	—			2,266		44,865		—			47,131
Total assets	$	5,111,727		$	6,780,173	$	3,751,796	$	(11,643,729	)	$	3,999,967
Liabilities:
Debt, net	$	—		$	1,535,239	$	424,998	$	(233,310	)	$	1,726,927
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	104,028			20,279		93,086		(740		)	216,653
Advances from affiliates	5,277,957			941,494		1,850,712		(8,070,163		)	—
Deferred income	—			3,631		25,951		—			29,582
Intangible lease liabilities, net	—			—		38,458		—			38,458
Interest rate swaps	—			1,478		—		—			1,478
Liabilities held for sale, net	—			—		380		—			380
Total liabilities	5,381,985			2,502,121		2,433,585		(8,304,213		)	2,013,478
Equity:
Total stockholders’ equity	(270,258		)	4,278,052		1,318,211		(3,339,516		)	1,986,489
Total liabilities and stockholders’ equity	$	5,111,727		$	6,780,173	$	3,751,796	$	(11,643,729	)	$	3,999,967

Consolidating Statements of Income
For the three months ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	9,238		$	92,723		$	(483	)	$	101,478
Tenant reimbursements	—			2,195			19,961			(109		)	22,047
Property management fee revenue	—			—			4,147			(3,765		)	382
Other property related income	—			29			5,238			—			5,267
	—			11,462			122,069			(4,357		)	129,174
Expenses:
Property operating costs	—			4,927			52,067			(4,357		)	52,637
Depreciation	—			2,846			24,269			—			27,115
Amortization	—			463			14,782			—			15,245
General and administrative	86			1,539			6,633			—			8,258
	86			9,775			97,751			(4,357		)	103,255
Real estate operating income/(loss)	(86		)	1,687			24,318			—			25,919
Other income (expense):
Interest expense	—			(13,953		)	(3,614		)	1,880			(15,687		)
Other income/(expense)	—			36			2,575			(1,880		)	731
Loss on sale of real estate assets, net	—			(13		)	(10		)	—			(23		)
	—			(13,930		)	(1,049		)	—			(14,979		)
Income/(loss) before consolidated subsidiaries	(86		)	(12,243		)	23,269			—			10,940
Income from subsidiaries	11,028			24,557			—			(35,585		)	—
Net income	10,942			12,314			23,269			(35,585		)	10,940
Plus: Net loss applicable to noncontrolling interest	—			—			2			—			2
Net income applicable to Piedmont	$	10,942		$	12,314		$	23,271		$	(35,585	)	$	10,942

Consolidating Statements of Income
For the three months ended June 30, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	11,068		$	107,909		$	(485	)	$	118,492
Tenant reimbursements	—			2,966			21,446			(127		)	24,285
Property management fee revenue	—			—			4,590			(4,190		)	400
Other property related income	—			22			5,480			—			5,502
	—			14,056			139,425			(4,802		)	148,679
Expenses:
Property operating costs	—			5,853			55,236			(4,802		)	56,287
Depreciation	—			3,281			26,778			—			30,059
Amortization	—			803			18,511			—			19,314
General and administrative	81			1,528			5,919			—			7,528
	81			11,465			106,444			(4,802		)	113,188
Real estate operating income/(loss)	(81		)	2,591			32,981			—			35,491
Other income (expense):
Interest expense	—			(14,810		)	(7,262		)	3,651			(18,421		)
Other income/(expense)	—			2,240			1,449			(3,651		)	38
Equity in income of unconsolidated joint ventures	—			107			—			—			107
Gain/(loss) on sale of real estate assets, net	—			6,495			(3		)	—			6,492
Net income/(loss)	(81		)	(3,377		)	27,165			—			23,707
Plus: Net loss applicable to noncontrolling interest	—			—			3			—			3
Net income/(loss) applicable to Piedmont	$	(81	)	$	(3,377	)	$	27,168		$	—		$	23,710

Consolidating Statements of Income
For the six months ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	18,052		$	185,794		$	(914	)	$	202,932
Tenant reimbursements	—			4,840			40,395			(194		)	45,041
Property management fee revenue	—			—			8,328			(7,637		)	691
Other property related income	—			57			10,353			—			10,410
	—			22,949			244,870			(8,745		)	259,074
Expenses:
Property operating costs	—			9,641			103,600			(8,745		)	104,496
Depreciation	—			5,710			48,550			—			54,260
Amortization	—			1,074			30,904			—			31,978
General and administrative	186			3,425			11,199			—			14,810
	186			19,850			194,253			(8,745		)	205,544
Real estate operating income/(loss)	(186		)	3,099			50,617			—			53,530
Other income (expense):
Interest expense	—			(25,975		)	(7,312		)	3,842			(29,445		)
Other income/(expense)	—			160			4,859			(3,842		)	1,177
Loss on extinguishment of debt	—			(1,680		)	—			—			(1,680		)
Gain on sale of real estate assets, net	—			1,417			43,769			—			45,186
	—			(26,078		)	41,316			—			15,238
Income/(loss) before consolidated subsidiaries	(186		)	(22,979		)	91,933			—			68,768
Income from subsidiaries	68,958			92,226			—			(161,184		)	—
Net income	68,772			69,247			91,933			(161,184		)	68,768
Plus: Net loss applicable to noncontrolling interest	—			—			4			—			4
Net income applicable to Piedmont	$	68,772		$	69,247		$	91,937		$	(161,184	)	$	68,772

Consolidating Statements of Income
For the six months ended June 30, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	22,456		$	215,019		$	(944	)	$	236,531
Tenant reimbursements	—			5,971			43,381			(230		)	49,122
Property management fee revenue	—			—			9,226			(8,301		)	925
Other property related income	—			54			10,510			—			10,564
	—			28,481			278,136			(9,475		)	297,142
Expenses:
Property operating costs	—			11,655			109,937			(9,475		)	112,117
Depreciation	—			6,744			54,083			—			60,827
Amortization	—			1,659			38,070			—			39,729
General and administrative	183			3,231			12,264			—			15,678
	183			23,289			214,354			(9,475		)	228,351
Real estate operating income/(loss)	(183		)	5,192			63,782			—			68,791
Other income (expense):
Interest expense	—			(29,254		)	(14,514		)	7,290			(36,478		)
Other income/(expense)	—			4,469			2,759			(7,290		)	(62		)
Equity in income of unconsolidated joint ventures	—			118			—			—			118
Gain on sale of real estate assets, net	—			6,434			5			—			6,439
Net income/(loss)	(183		)	(13,041		)	52,032			—			38,808
Plus: Net loss applicable to noncontrolling interest	—			—			6			—			6
Net income/(loss) applicable to Piedmont	$	(183	)	$	(13,041	)	$	52,038		$	—		$	38,814

Consolidating Statements of Comprehensive Income
For the Three Months Ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors		Eliminations			Piedmont (Consolidated)
Net income	$	10,942		$	12,314		$	23,271	$	(35,585	)	$	10,942
Effective portion of gain on derivative instruments that are designated and qualify as cash flow hedges	1,747			1,747			—		(1,747		)	1,747
Plus: Reclassification of gain included in net income	(245		)	(245		)	—		245			(245		)
Other comprehensive income	1,502			1,502			—		(1,502		)	1,502
Comprehensive income	$	12,444		$	13,816		$	23,271	$	(37,087	)	$	12,444

Consolidating Statements of Comprehensive Income
For the Six Months Ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations			Piedmont (Consolidated)
Net income	$	68,772	$	69,247	$	91,937	$	(161,184	)	$	68,772
Effective portion of gain on derivatives instruments that are designated and qualify as cash flow hedges	3,264		3,264		—		(3,264		)	3,264
Plus: Reclassification of net loss included in net income	807		807		—		(807		)	807
Other comprehensive income	4,071		4,071		—		(4,071		)	4,071
Comprehensive income	$	72,843	$	73,318	$	91,937	$	(165,255	)	$	72,843

Condensed Consolidating Statements of Cash Flows
For the six months ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Piedmont (Consolidated)
Net Cash Provided by Operating Activities	$	71,842		$	73,022		$	99,557		$	(161,176	)	$	83,245
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	—			(3,159		)	(51,493		)	—			(54,652		)
Intercompany note receivable	—			88,000			—			(88,000		)	—
Net sales proceeds from wholly-owned properties	—			36,572			382,985			—			419,557
Note receivable issuance	—			—			(3,200		)	—			(3,200		)
Deferred lease costs paid	—			(20		)	(10,199		)	—			(10,219		)
Distributions from subsidiaries	353,518			64,863			—			(418,381		)	—
Net cash provided by investing activities	353,518			186,256			318,093			(506,381		)	351,486
Cash Flows from Financing Activities:
Debt issuance costs paid	—			(248		)	—			—			(248		)
Proceeds from debt	—			773,225			—			—			773,225
Repayments of debt	—			(780,000		)	(721		)	—			(780,721		)
Intercompany note payable	—			—			(88,000		)	88,000			—
Value of shares withheld to pay tax obligations related to employee stock compensation	(2,213		)	—			—			—			(2,213		)
Repurchases of common stock as part of announced plan	(266,062		)	—			—			—			(266,062		)
Distributions	(157,085		)	(250,818		)	(328,762		)	579,557			(157,108		)
Net cash used in financing activities	(425,360		)	(257,841		)	(417,483		)	667,557			(433,127		)
Net increase in cash, cash equivalents, and restricted cash and escrows	—			1,437			167			—			1,604
Cash, cash equivalents, and restricted cash and escrows, beginning of period	150			3,906			4,699			—			8,755
Cash, cash equivalents, and restricted cash and escrows, end of period	$	150		$	5,343		$	4,866		$	—		$	10,359

Condensed Consolidating Statements of Cash Flows
For the six months ended June 30, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations		Piedmont (Consolidated)
Net Cash Provided by/(Used in) Operating Activities	$	3,091		$	(10,029	)	$	118,678		$	—	$	111,740
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	—			(757		)	(57,563		)	—		(58,320		)
Investments in unconsolidated joint ventures	—			(284		)	—			—		(284		)
Net sales proceeds from wholly-owned properties	—			23,032			(9		)	—		23,023
Deferred lease costs paid	—			(736		)	(8,827		)	—		(9,563		)
Net cash provided by/(used in) investing activities	—			21,255			(66,399		)	—		(45,144		)
Cash Flows from Financing Activities:
Debt issuance costs paid	—			(102		)	—			—		(102		)
Proceeds from debt	—			147,000			—			—		147,000
Repayments of debt	—			(115,000		)	(694		)	—		(115,694		)
Costs of issuance of common stock	(74		)	—			—			—		(74		)
Value of shares withheld to pay tax obligations related to employee stock compensation	(3,380		)	—			—			—		(3,380		)
(Distributions to)/repayments from affiliates	92,020			(41,618		)	(50,402		)	—		—
Dividends paid and discount on dividend reinvestments	(91,657		)	—			(7		)	—		(91,664		)
Net cash used in financing activities	(3,091		)	(9,720		)	(51,103		)	—		(63,914		)
Net increase in cash, cash equivalents, and restricted cash and escrows	—			1,506			1,176			—		2,682
Cash, cash equivalents, and restricted cash and escrows, beginning of period	150			3,693			4,361			—		8,204
Cash, cash equivalents, and restricted cash and escrows, end of period	$	150		$	5,199		$	5,537		$	—	$	10,886

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Subsequent Events

6 Months Ended

Jun. 30, 2018

Subsequent Events [Abstract]

Subsequent Events

Subsequent Events

Third Quarter Dividend Declaration

On August 1, 2018, the Board of Directors of Piedmont declared dividends for the third quarter 2018 in the amount of $0.21 per common share outstanding to stockholders of record as of the close of business on August 31, 2018. Such dividends are to be paid on September 21, 2018.

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Summary of Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

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 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.

Principles of Consolidation

Piedmont’s consolidated financial statements include the accounts of Piedmont, Piedmont’s wholly-owned subsidiaries, any variable interest entity ("VIE") for which Piedmont or any of its wholly-owned subsidiaries is considered to have the power to direct the activities of the entity and the obligation to absorb losses/right to receive benefits, or any entity in which Piedmont or any of its wholly-owned subsidiaries owns a controlling interest. In determining whether Piedmont or Piedmont OP has a controlling interest, the following factors, among others, are considered: equity ownership, voting rights, protective rights of investors, and participatory rights of investors. 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, 2017.

All intercompany balances and transactions have been eliminated upon consolidation.

Further, Piedmont has formed special purpose entities to acquire and hold real estate. Each special purpose entity is a separate legal entity. Consequently, the assets of these special purpose entities are not available to all creditors of Piedmont. The assets owned by these special purpose entities are being reported on a consolidated basis with Piedmont’s assets for financial reporting purposes only.

Use of Estimates

Use of Estimates

The preparation of the accompanying consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the accompanying consolidated financial statements and notes. Actual results could differ from those estimates.

Income Taxes

Income Taxes

Piedmont has elected to be taxed as a REIT under the Internal Revenue Code of 1986, as amended, and has operated as such, beginning with its taxable year ended December 31, 1998. To qualify as a REIT, Piedmont must meet certain organizational and operational requirements, including a requirement to distribute at least 90% of its annual REIT taxable income. As a REIT, Piedmont is generally not subject to federal income taxes, subject to fulfilling, among other things, its taxable income distribution requirement. Piedmont is subject to certain taxes related to the operations of properties in certain locations, as well as operations conducted by its taxable REIT subsidiary, POH, which have been provided for in the financial statements.

Tax Cuts and Jobs Act

The Tax Cuts and Jobs Act ("H.R. 1"), which generally took effect for taxable years that began on or after January 1, 2018 (subject to certain exceptions), made many significant changes to the U.S. federal income tax laws that will profoundly impact the taxation of individuals and corporations (including both regular C corporations and corporations that have elected to be taxed as REITs). For example, H.R. 1 limits the ability of corporations to utilize net operating loss carryforwards and limits the deductibility of business interest for all taxpayers, subject to an exception for taxpayers that are engaged in certain specified real property trades or business who make an irrevocable election not to apply the limitation to a particular real property trade or business and to depreciate their real property investments held in such trade or business using the less favorable alternative depreciation system. To date, the IRS has issued limited guidance with respect to certain of the provisions of H.R. 1, and there are numerous interpretive issues that will require guidance. In addition, changes made by H.R. 1 may require Piedmont to accrue certain income for U.S. federal income tax purposes no later than when such income is taken into account as revenue on its GAAP-based financial statements, unless the income is already subject to certain special methods of accounting under the Code. This could cause Piedmont to recognize taxable income prior to the receipt of the associated cash and accordingly, increase its distribution levels in order to maintain its status as a REIT. H.R. 1 also includes limitations on the deductibility of certain compensation paid to Piedmont's executives, certain interest payments, and certain net operating loss carryforwards, each of which could potentially increase Piedmont's taxable income and its required distributions. Piedmont recorded an approximate $0.2 million reduction to its tax liability related to its taxable REIT subsidiary as a result of the rate reduction included in H.R. 1 during the six months ended June 30, 2018. Although management is still evaluating the other effects of H.R. 1, Piedmont does not believe that H.R. 1 will significantly impact its financial statements.

Reclassifications

Reclassifications

Certain prior period amounts presented in the accompanying consolidated statements of income have been reclassified to conform to the current period financial statement presentation. These amounts included: (i) the reclassification of approximately $5.5 million and $10.6 million for the three and six months endedJune 30, 2017, respectively, of parking, antennae license and fiber income that was previously included in rental income into other property related income, as well as certain other miscellaneous revenue into tenant reimbursements and/or property management fee revenue in conjunction with the adoption of the Revenue Recognition Amendments, as further defined and described below; and (ii) the reclassification of $0.5 million and $1.0 million for the three and six months endedJune 30, 2017, respectively, of expense related to certain regional employees who are primarily engaged in the operation and management of properties that was previously included in general and administrative expense to property operating costs.

Recent Accounting Pronouncements

Accounting Pronouncements Adopted during the Six Months Ended June 30, 2018

Revenue Recognition

On January 1, 2018, Piedmont adopted Accounting Standards Update No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09") and Accounting Standards Update No. 2016-08, Revenue from Contracts with Customers (Topic 606) Principal versus Agent Considerations (Reporting Revenue Gross versus Net) ("ASU 2016-08") issued by the Financial Accounting Standards Board (the "FASB"). The amendments in ASU 2014-09, which are further clarified in ASU 2016-08, as well as Accounting Standards Update 2016-10, Accounting Standards Update 2016-12, and Accounting Standards Update 2016-20 (collectively the "Revenue Recognition Amendments") change the criteria for the recognition of certain revenue streams to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services using a five-step determination process.

Piedmont's revenues which are included in the scope of the Revenue Recognition Amendments include its property management fee revenue, the majority of its parking revenue, as well as certain license agreements which allow third-parties to place their antennas or fiber-optic cabling on or inside Piedmont's buildings. Lease contracts are specifically excluded from the Revenue Recognition Amendments and, Piedmont intends to utilize a leasing practical expedient, which has been tentatively approved by the FASB, to group certain non-lease components related to operating expense reimbursements with other leasing components, provided they meet certain criteria. Because the timing and pattern of transfer of Piedmont's non-lease related revenue already followed the prescribed method of the Revenue Recognition Amendments, Piedmont was able to effectively adopt these amendments on a full retrospective basis, with no impact to the timing of recognition of the related revenue; however, such non-lease revenues are now being presented as "Other property related income" in the accompanying consolidated statements of income. Further, for comparative purposes, Piedmont reclassified approximately $5.5 million and $10.6 million for the three and six months endedJune 30, 2017, respectively, of parking, antennae license, and fiber income that was previously included in rental income into other property related income, as well as certain other miscellaneous revenue into tenant reimbursements and/or property management fee revenue. Piedmont did not elect to adopt any practical expedients provided by the Revenue Recognition Amendments.

A detail of Piedmont's total revenues for the three months ended June 30, 2018 and 2017 (after reclassifications as a result of the adoption of the Revenue Recognition Amendments), including a detailed description of each line item is as follows:

			(After Adoption of Revenue Recognition Amendments)
	Three Months Ended June 30, 2018		Three Months Ended June 30, 2017
Rental income	$	101,478	$	118,492
Tenant reimbursements	22,047		24,285
Property management fee revenue	382		400
Other property related income	5,267		5,502
Total revenues	$	129,174	$	148,679

Rental income- consists of revenue from leases with Piedmont's tenants, which is not within the scope of the Revenue Recognition Amendments.

Tenant reimbursements - consists of revenue derived from reimbursements for services prescribed by leases with Piedmont's tenants separate from, but in conjunction with, the revenue generated from leasing office space. Such income is not within the scope of the Revenue Recognition Amendments.

Property management fee revenue- consists of revenue earned by Piedmont related to operating and managing office properties owned by other third-parties. Such income is within the scope of the Revenue Recognition Amendments; however, because the property management services represent a performance obligation that would be satisfied over the length of the contract, not at any specific point in time, and has the same measure of transfer (time elapsed), property management fee revenue will be recognized over time, consistent with the timing of Piedmont’s historic recognition. Any variable consideration transferred as part of these management agreements will continue to be recognized in the quarter that the underlying cash receipts are collected, consistent with the allocation objective of allocating the transaction price in an amount that depicts the amount of consideration to which Piedmont expects to be entitled in exchange for transferring the promised service to the customer.

Other property related income - consists of all other property related income from Piedmont's customers (tenants) that is not derived from a contract meeting the definition of a lease. Examples of such income include parking revenue and income from licenses with unrelated third-parties to place antennae and/or fiber optic cables in or on Piedmont's buildings. Since these services are substantially the same and have the same pattern of transfer, there is no timing difference between the recognition of other property related income and the recognition of the underlying expense/delivery of “service” under the new Revenue Recognition Amendments. Additionally, no modification to the timing of Piedmont’s previous revenue recognition is necessary, as these items have been recognized historically in accordance with this pattern of transfer.

Gain/(loss) on Sale of Real Estate Assets

On January 1, 2018, Piedmont adopted Accounting Standards Update No. 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20): Clarifying the Scope of Asset Derecognition Guidance and Accounting for Partial Sales of Nonfinancial Assets ("ASU 2017-05") concurrent with the Revenue Recognition Amendments mentioned above. Piedmont elected to apply the amendments of ASU 2017-05 on a full retrospective basis; however, there were no adjustments to previously recorded gains/(losses) on sale of real estate as a result of the transition.

Equity Investments Held in Non-qualified Deferred Compensation Plan

On January 1, 2018, Piedmont adopted Accounting Standards Update No. 2016-01, Financial Instruments - Overall (Subtopic 825-10), Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"), as well as Accounting Standards Update No. 2018-03 Technical Corrections and Improvements to Financial Instruments-Overall (Subtopic 825-10) ("ASU 2018-03"). These amendments require equity investments, except those accounted for under the equity method of accounting, to be measured at estimated fair value with changes in fair value recognized in net income. Investments in trading securities held in a "rabbi trust" by Piedmont are the only securities affected by ASU 2016-01 and ASU 2018-03. As such, Piedmont has made a cumulative-effect adjustment to its consolidated balance sheet and consolidated statements of stockholders' equity of approximately $0.1 million from other comprehensive income to cumulative distributions in excess of earnings, and has recorded changes in fair value in net income for the three and six months endedJune 30, 2018 related to these investment securities.

Interest Rate Derivatives

On January 1, 2018, Piedmont early adopted Accounting Standards Update No. 2017-12, Derivatives and Hedging: Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"). Piedmont adopted ASU 2017-12 using the modified retrospective transition method; however, no adjustment was necessary to account for the cumulative effect of the change on the opening balance of each affected component of equity in the consolidated balance sheet as of the date of adoption because there was no cumulative ineffectiveness that had been recorded on Piedmont's existing interest rate swaps as of December 31, 2017, and all other trades were perfectly effective. The amended presentation and disclosure guidance which is required to be presented prospectively is provided inNote 6.

Other Recent Accounting Pronouncements

The FASB has issued Accounting Standards Update No. 2016-02, Leases (Topic 842) ("ASU 2016-02"), which fundamentally changes the definition of a lease, as well as the accounting for operating leases by requiring lessees to recognize assets and liabilities which arise from the lease, consisting of a liability to make lease payments (the lease liability) and a right-of-use asset, representing the right to use the leased asset over the term of the lease. Accounting for leases by lessors is substantially unchanged from prior practice as lessors will continue to recognize lease revenue on a straight-line basis. Additionally, Accounting Standards Update No. 2018-11, Leases (Topic 842) Targeted Improvements ("ASU 2018-11") issued by the FASB allows certain non-lease operating expense reimbursements to be accounted for as part of the lease provided certain criteria are met under an optional practical expedient. Further, the FASB has issued Accounting Standards Update No. 2018-01 Leases (Topic 842) Land Easement Practical Expedient for Transition to Topic 842 ("ASU 2018-01"). The amendments to ASU No. 2018-01 clarify that a land easement is required to be evaluated to determine whether it should be accounted for as a lease upon adoption of ASU 2016-02, and provides an optional practical transition expedient allowing entities not currently assessing land easements under existing leasing guidance prior to adoption of ASU 2016-02 to not apply the new guidance to land easements existing at the date of initial adoption of ASU 2016-02. The amendments in ASU 2016-02, ASU 2018-01, and ASU 2018-11 are effective in the first quarter of 2019. Although management continues to evaluate the guidance and disclosures required by these amendments, Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption related to lessor accounting. However, Piedmont does expect to record a right-to-use asset and related liability under lessee accounting, and Piedmont is still evaluating the potential impact of such lessee accounting.

The FASB has issued Accounting Standards Update No. 2018-07, Stock Compensation (Topic 718), Improvements to NonEmployee Share-Based Payment Accounting ("ASU 2018-07"). The provisions of ASU 2018-07 align accounting for stock based compensation for non-employees for goods and services with existing accounting for similar compensation for employees. The amendments supersede previous guidance on accounting for share-based payments to non-employees codified in the FASB's Accounting Standards Codification ("ASC") 505-50. ASU 2018-07 is effective in the first quarter of 2019, with early adoption permitted at any time provided that the entity has already adopted the provisions of ASC 606. Piedmont does not anticipate any material impact to its consolidated financial statements as a result of adoption.

The FASB has issued Accounting Standards Update No. 2016-13, Financial Instruments—Credit Losses (Topic 326),Measurement of Credit Losses on Financial Instruments ("ASU 2016-13"). The provisions of ASU 2016-13 replace the "incurred loss" approach with an "expected loss" model for impairing trade and other receivables, held-to-maturity debt securities, net investment in leases, and off-balance-sheet credit exposures, which will generally result in earlier recognition of allowances for credit losses. Additionally, the provisions change the classification of credit losses related to available-for-sale securities to an allowance, rather than a direct reduction of the amortized cost of the securities. ASU 2016-13 is effective in the first quarter of 2020, with early adoption permitted as of January 1, 2019. Piedmont is currently evaluating the potential impact of adoption.

Risk Management Objective of Using Derivatives

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.

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Summary of Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2018

Accounting Policies [Abstract]

Schedule of New Accounting Pronouncements and Changes in Accounting Principles

A detail of Piedmont's total revenues for the three months ended June 30, 2018 and 2017 (after reclassifications as a result of the adoption of the Revenue Recognition Amendments), including a detailed description of each line item is as follows:

			(After Adoption of Revenue Recognition Amendments)
	Three Months Ended June 30, 2018		Three Months Ended June 30, 2017
Rental income	$	101,478	$	118,492
Tenant reimbursements	22,047		24,285
Property management fee revenue	382		400
Other property related income	5,267		5,502
Total revenues	$	129,174	$	148,679

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Acquisitions (Tables)

6 Months Ended

Jun. 30, 2018

Business Combinations [Abstract]

Schedule of Purchased Assets

During the six months endedJune 30, 2018, Piedmont acquired one property using proceeds available as a result of dispositions (see Note 9) in January 2018 and cash on hand, as noted below:

Property	Metropolitan Statistical Area	Date of Acquisition	Ownership Percentage Acquired		Rentable Square Feet	Percentage Leased as of Acquisition		Net Contractual Purchase Price  (in millions)
501 West Church Street	Orlando, Florida	February 23, 2018	100	%	182,461	100	%	$	28.0

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Debt (Tables)

6 Months Ended

Jun. 30, 2018

Debt Disclosure [Abstract]

Schedule of Debt

The following table summarizes the terms of Piedmont’s indebtedness outstanding as of June 30, 2018 and December 31, 2017 (in thousands):

Facility (1)	Stated Rate		Effective Rate (2)			Maturity		Amount Outstanding as of
								June 30, 2018		December 31, 2017
Secured (Fixed)
$35 Million Fixed-Rate Loan (3)	5.55	%	3.75	%		9/1/2021		$	30,195	$	30,670
$160 Million Fixed-Rate Loan (4)	3.48	%	3.58	%		7/5/2022		160,000		160,000
Net premium and unamortized debt issuance costs								795		946
Subtotal/Weighted Average (5)	3.81	%						190,990		191,616
Unsecured (Variable and Fixed)
$170 Million Unsecured 2015 Term Loan	LIBOR + 1.125%		2.54	%		5/15/2018		—		170,000
$300 Million Unsecured 2013 Term Loan	LIBOR + 1.20%		2.78	%	(7)	1/31/2019		—		300,000
$500 Million Unsecured 2015 Line of Credit (6)	LIBOR + 1.00%		3.08	%		6/18/2019	(8)	238,000		23,000
$300 Million Unsecured 2011 Term Loan	LIBOR +  1.15%		3.35	%	(7)	1/15/2020		300,000		300,000
$350 Million Senior Notes	3.40	%	3.43	%		6/01/2023		350,000		350,000
$400 Million Senior Notes	4.45	%	4.10	%		3/15/2024		400,000		400,000
$250 Million Unsecured 2018 Term Loan	LIBOR + 1.60%		3.95	%	(9)	3/31/2025		250,000		—
Discounts and unamortized debt issuance costs								(8,144)		(7,689)
Subtotal/Weighted Average (5)	3.70	%						1,529,856		1,535,311
Total/Weighted Average (5)	3.71	%						$	1,720,846	$	1,726,927

⁽¹⁾  Other than the $35 Million Fixed-Rate Loan, all of Piedmont’s outstanding debt as of June 30, 2018 and December 31, 2017 is interest-only.

⁽²⁾  Effective rate after consideration of settled or in-place interest rate swap agreements, issuance premiums/discounts, and/or fair market value adjustments upon assumption of debt.

⁽³⁾  Collateralized by the 5 Wall Street building in Burlington, Massachusetts.

⁽⁴⁾  Collateralized by the 1901 Market Street building in Philadelphia, Pennsylvania.

⁽⁵⁾  Weighted average is based on contractual balance of outstanding debt and the stated or effectively fixed interest rates as of June 30, 2018.

⁽⁶⁾  On a periodic basis, Piedmont may select from multiple interest rate options, including the prime rate and various-length LIBOR locks on all or a portion of the principal. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating.

⁽⁷⁾  The facility has a stated variable rate; however, Piedmont has entered into interest rate swap agreements which effectively fix, exclusive of changes in Piedmont's credit rating, the rate to that shown as the effective rate.

⁽⁸⁾  Piedmont may extend the term for up to one additional year (through two available six month extensions to a final extended maturity date of June 18, 2020) provided Piedmont is not then in default and upon payment of extension fees.

⁽⁹⁾  The facility has a stated variable rate; however, Piedmont has entered into interest rate swap agreements which effectively fix, exclusive of changes to Piedmont's credit rating, $150 million of the principal balance to 4.11% through March 29, 2020, and $100 million of the principal balance to 4.21% from March 30, 2020 through the maturity date of the loan. For the remaining variable portion of the loan, Piedmont may periodically select from multiple interest rate options, including the prime rate and various-length LIBOR locks on all or a portion of the principal. All LIBOR selections are subject to an additional spread over the selected rate based on Piedmont’s current credit rating. The rate presented is the weighted-average rate for the effectively fixed and variable portions of the debt outstanding as of June 30, 2018.

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Variable Interest Entities (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Variable Interest Entities

A summary of Piedmont’s interests in its consolidated VIEs and their related carrying values as of June 30, 2018 and December 31, 2017 is as follows (net carrying amount in millions):

	Piedmont's %		Net Carrying Amount as of		Net Carrying Amount as of
Entity	Ownership of Entity	Related Building	June 30, 2018		December 31, 2017		Primary Beneficiary Considerations
1201 Eye Street N.W. Associates, LLC	98.6%	1201 Eye Street	$	87.5	$	81.1	In accordance with the partnership’s governing documents, Piedmont currently receives 100% of the cash flow of the entity and has sole discretion in directing the management and leasing activities of the building.
1225 Eye Street N.W. Associates, LLC	98.1%	1225 Eye Street	$	64.5	$	65.2	In accordance with the partnership’s governing documents, Piedmont currently receives 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	$	256.5	$	263.2	The Omnibus Agreement with the previous owner includes equity participation rights upon sale of the property for the previous owner, if certain financial returns are achieved; however, Piedmont has sole decision making authority and is entitled to 100% of the economic benefits of the property until such returns are met.

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Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2018

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 June 30, 2018 is as follows:

Interest Rate Derivatives:	Number of Swap Agreements	Associated Debt Instrument	Total Notional Amount (in millions)		Effective Date	Maturity Date
Interest rate swaps	3	$300 Million Unsecured 2011 Term Loan	$	300	11/22/2016	1/15/2020
Interest rate swaps	2	$250 Million Unsecured 2018 Term Loan	$	100	3/29/2018	3/31/2025
Interest rate swaps	1	$250 Million Unsecured 2018 Term Loan	$	50	3/29/2018	3/29/2020
Total			$	450

Schedule of Interest Rate Derivatives

A detail of Piedmont’s interest rate derivatives on a gross and net basis as of June 30, 2018 and December 31, 2017, respectively, is as follows (in thousands):

Interest rate swaps classified as:	June 30, 2018		December 31, 2017
Gross derivative assets	$	2,679	$	688
Gross derivative liabilities	—		(1,478		)
Net derivative asset/(liability)	$	2,679	$	(790	)

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

The gain/(loss) on Piedmont's interest rate derivatives, including previously settled forward swaps, that was recorded in OCI and the accompanying consolidated statements of income as a component of interest expense for the three and six months endedJune 30, 2018 and 2017, respectively, was as follows (in thousands):

	Three Months Ended					Six Months Ended
Interest Rate Swaps in Cash Flow Hedging Relationships	June 30, 2018		June 30, 2017			June 30, 2018			June 30, 2017
Amount of gain/(loss) recognized in OCI	$	1,747	$	(911	)	$	3,264		$	132
Amount of previously recorded gain/(loss) reclassified from OCI into Interest Expense	$	245	$	(977	)	$	451		$	(2,283	)
Amount of gain/(loss) recognized on derivatives reclassified from OCI into Loss on Extinguishment of Debt	$	—	$	—		$	(1,258	)	$	—
Total amount of Interest Expense presented in the consolidated statements of income	$	15,687	$	18,421		$	29,445		$	36,478
Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of income (1)	$	—	$	—		$	1,680		$	—

⁽¹⁾  Includes the write-off of approximately $0.4 million of discounts and unamortized debt issuance costs associated with the repayment of debt (see Note 4).

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Fair Value Measurement of Financial Instruments (Tables)

6 Months Ended

Jun. 30, 2018

Fair Value Disclosures [Abstract]

Fair Value, by Balance Sheet Grouping

The following table sets forth the carrying and estimated fair value for each of Piedmont’s financial instruments, as well as its level within the GAAP fair value hierarchy, as of June 30, 2018 and December 31, 2017, respectively (in thousands):

	June 30, 2018					December 31, 2017
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)	$	8,944	$	8,944	Level 1	$	7,382	$	7,382	Level 1
Tenant receivables, net(1)	$	9,323	$	9,323	Level 1	$	12,139	$	12,139	Level 1
Notes receivable (1)	$	3,200	$	3,200	Level 1	$	—	$	—	Level 1
Restricted cash and escrows(1)	$	1,415	$	1,415	Level 1	$	1,373	$	1,373	Level 1
Interest rate swaps	$	2,679	$	2,679	Level 2	$	688	$	688	Level 2
Liabilities:
Accounts payable and accrued expenses(1)	$	11,000	$	11,000	Level 1	$	126,429	$	126,429	Level 1
Interest rate swaps	$	—	$	—	Level 2	$	1,478	$	1,478	Level 2
Debt, net	$	1,720,846	$	1,725,912	Level 2	$	1,726,927	$	1,759,905	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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Assets Held for Sale (Tables)

6 Months Ended

Jun. 30, 2018

Discontinued Operations and Disposal Groups [Abstract]

Schedule of Assets Held for Sale

Details of assets held for sale as of June 30, 2018 and December 31, 2017 are presented below (in thousands):

	June 30, 2018		December 31, 2017
Real estate assets held for sale, net:
Land	$	—	$	74,498
Building and improvements, less accumulated depreciation of $0 and $169,116 as of June 30, 2018 and December 31, 2017, respectively	—		255,634
Construction in progress	—		2,278
Total real estate assets held for sale, net	$	—	$	332,410
Other assets held for sale, net:
Straight-line rent receivables	$	—	$	25,975
Prepaid expenses and other assets	—		328
Deferred lease costs, less accumulated amortization of $0 and $16,549 as of June 30, 2018 and December 31, 2017, respectively	—		20,828
Total other assets held for sale, net	$	—	$	47,131
Other liabilities held for sale, net:
Intangible lease liabilities, less accumulated amortization of $0 and $935 as of June 30, 2018 and December 31, 2017, respectively	$	—	$	380

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Stock Based Compensation (Tables)

6 Months Ended

Jun. 30, 2018

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

Schedule of Nonvested Share Activity

A rollforward of Piedmont's equity based award activity for the six months endedJune 30, 2018 is as follows:

	Shares		Weighted-Average Grant Date Fair Value
Unvested and Potential Stock Awards as of December 31, 2017	868,437		$	21.69
Deferred Stock Awards Granted	354,236		$	17.84
Increase in Estimated Potential Share Award	379,249		$	23.80
Performance Stock Awards Vested	(161,005	)	$	18.47
Deferred Stock Awards Vested	(331,195	)	$	19.21
Deferred Stock Awards Forfeited	(6,515	)	$	19.98
Unvested and Potential Stock Awards as of June 30, 2018	1,103,207		$	22.42

The following table provides additional information regarding stock award activity during the three and six months endedJune 30, 2018 and 2017, respectively (in thousands, except per share amounts):

	Three Months Ended				Six Months Ended
	June 30, 2018		June 30, 2017		June 30, 2018		June 30, 2017
Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period	$	17.84	$	21.38	$	17.84	$	21.38
Total Grant Date Fair Value of Deferred Stock Vested During the Period	$	5,639	$	5,551	$	6,363	$	5,841
Share-based Liability Awards Paid During the Period(1)	$	—	$	—	$	2,947	$	2,877

⁽¹⁾  Amounts reflect the issuance of performance share awards related to the 2014-16 and 2015-17 Performance Share Plans during the six months endedJune 30, 2018 and 2017, respectively.

Schedule of Outstanding Employee Stock Awards

A detail of Piedmont’s outstanding stock awards as of June 30, 2018 is as follows:

Date of grant	Type of Award	Net Shares Granted (1)	Grant Date Fair Value		Vesting Schedule	Unvested Shares
January 3, 2014	Deferred Stock Award	72,969	$	16.45	Of the shares granted, 20% vested or will vest on January 3, 2015, 2016, 2017, 2018, and 2019, respectively.	16,416
May 24, 2016	Deferred Stock Award	208,055	$	19.91	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 24, 2017, 2018, and 2019, respectively.	60,975
May 24, 2016	Fiscal Year 2016-2018 Performance Share Program	—	$	23.02	Shares awarded, if any, will vest immediately upon determination of award in 2019.	119,371	(2)
May 18, 2017	Deferred Stock Award	219,947	$	21.38	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 18, 2018, 2019, and 2020, respectively.	124,281
May 18, 2017	Fiscal Year 2017-2019 Performance Share Program	—	$	30.45	Shares awarded, if any, will vest immediately upon determination of award in 2020.	143,335	(2)
May 17, 2018	Deferred Stock Award-Board of Directors	31,388	$	17.84	Of the shares granted, 100% will vest by May 17, 2019.	31,388
May 17, 2018	Deferred Stock Award	302,865	$	17.84	Of the shares granted, 25% vested on the date of grant, and 25% vested or will vest on May 17, 2019, 2020, and 2021, respectively.	241,409
May 17, 2018	Fiscal Year 2018-2020 Performance Share Program	—	$	23.52	Shares awarded, if any, will vest immediately upon determination of award in 2021.	366,032	(2)
Total						1,103,207

⁽¹⁾  Amounts reflect the total grant to employees and independent directors, net of shares surrendered upon vesting to satisfy required minimum tax withholding obligations through June 30, 2018.

⁽²⁾  Estimated based on Piedmont's cumulative TSR for the respective performance period through June 30, 2018. Share estimates are subject to change in future periods based upon Piedmont's relative performance compared to its peers' total stockholder return.

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Supplemental Disclosures for the Statement of Consolidated Cash Flows (Tables)

6 Months Ended

Jun. 30, 2018

Supplemental Cash Flow Elements [Abstract]

Schedule of Cash Flow, Supplemental Disclosures

Certain noncash investing and financing activities for the six months endedJune 30, 2018 and 2017, (in thousands) are outlined below:

	Six Months Ended
	June 30, 2018			June 30, 2017
Accrued capital expenditures and deferred lease costs	$	8,920		$	9,417
Change in accrued dividends and discount on dividend reinvestments	$	(101,800	)	$	(30,532	)
Change in accrued share repurchases as part of an announced plan	$	(1,277	)	$	—

The following table provides a reconciliation of cash, cash equivalents, and restricted cash and escrows as reported, or previously reported, within the consolidated balance sheet to the consolidated statement of cash flows as of the six months endedJune 30, 2018 and 2017, respectively (in thousands).

	Six Months Ended
	June 30, 2018		June 30, 2017
Cash and cash equivalents, beginning of period	$	7,382	$	6,992
Restricted cash and escrows, beginning of period	1,373		1,212
Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, beginning of period	$	8,755	$	8,204
Cash and cash equivalents, end of period	$	8,944	$	9,596
Restricted cash and escrows, end of period	1,415		1,290
Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows, end of period	$	10,359	$	10,886

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Earnings Per Share (Tables)

6 Months Ended

Jun. 30, 2018

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 six months endedJune 30, 2018 and 2017, respectively (in thousands):

	Three Months Ended		Six Months Ended
	June 30, 2018	June 30, 2017	June 30, 2018	June 30, 2017
Weighted-average common shares – basic	128,346	145,413	132,091	145,350
Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards	355	400	341	430
Weighted-average common shares – diluted	128,701	145,813	132,432	145,780
Common stock issued and outstanding as of period end			128,371	145,490

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Guarantor and Non-Guarantor Financial Information (Tables)

6 Months Ended

Jun. 30, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Condensed Consolidated Balance Sheets

Condensed Consolidating Balance Sheets
As of June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations			Piedmont (Consolidated)
Assets:
Real estate assets, at cost:
Land	$	—	$	36,094	$	511,508	$	—		$	547,602
Buildings and improvements, less accumulated depreciation	—		176,704		2,233,345		(300		)	2,409,749
Intangible lease assets, less accumulated amortization	—		—		70,271		—			70,271
Construction in progress	—		408		17,423		—			17,831
Total real estate assets	—		213,206		2,832,547		(300		)	3,045,453
Cash and cash equivalents	150		5,311		3,483		—			8,944
Tenant and straight-line rent receivables, net	—		15,467		166,020		—			181,487
Investment in subsidiaries	1,743,439		2,803,136		169		(4,546,744		)	—
Notes receivable	—		810		147,700		(145,310		)	3,200
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	77		7,020		26,205		(28		)	33,274
Goodwill	—		98,918		—		—			98,918
Deferred lease costs, net	—		15,530		237,184		—			252,714
Total assets	$	1,743,666	$	3,159,398	$	3,413,308	$	(4,692,382	)	$	3,623,990
Liabilities:
Debt, net	$	—	$	1,529,792	$	336,364	$	(145,310	)	$	1,720,846
Accounts payable, accrued expenses, and accrued capital expenditures	610		15,012		78,621		(28		)	94,215
Deferred income	—		2,185		23,347		—			25,532
Intangible lease liabilities, net	—		—		40,341		—			40,341
Total liabilities	610		1,546,989		478,673		(145,338		)	1,880,934
Equity:
Total stockholders’ equity	1,743,056		1,612,409		2,934,635		(4,547,044		)	1,743,056
Total liabilities and stockholders’ equity	$	1,743,666	$	3,159,398	$	3,413,308	$	(4,692,382	)	$	3,623,990

Condensed Consolidating Balance Sheets
As of December 31, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)		Non-Guarantors		Eliminations			Piedmont (Consolidated)
Assets:
Real estate assets, at cost:
Land	$	—		$	36,094	$	508,700	$	—		$	544,794
Buildings and improvements, less accumulated depreciation	—			180,886		2,237,437		(300		)	2,418,023
Intangible lease assets, less accumulated amortization	—			181		77,624		—			77,805
Construction in progress	—			85		11,625		—			11,710
Real estate assets held for sale, net	—			32,815		299,595		—			332,410
Total real estate assets	—			250,061		3,134,981		(300		)	3,384,742
Cash and cash equivalents	150			3,890		3,342		—			7,382
Tenant and straight-line rent receivables, net, and amounts due from unconsolidated joint ventures	—			16,891		158,418		—			175,309
Advances to affiliates	1,674,276			6,297,632		—		(7,971,908		)	—
Investment in subsidiary	3,437,299			—		172		(3,437,471		)	—
Notes receivable	—			88,810		144,500		(233,310		)	—
Prepaid expenses, restricted cash, escrows, interest rate swaps and other assets	2			5,094		20,222		(740		)	24,578
Goodwill	—			98,918		—		—			98,918
Deferred lease costs, net	—			16,611		245,296		—			261,907
Other assets held for sale, net	—			2,266		44,865		—			47,131
Total assets	$	5,111,727		$	6,780,173	$	3,751,796	$	(11,643,729	)	$	3,999,967
Liabilities:
Debt, net	$	—		$	1,535,239	$	424,998	$	(233,310	)	$	1,726,927
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	104,028			20,279		93,086		(740		)	216,653
Advances from affiliates	5,277,957			941,494		1,850,712		(8,070,163		)	—
Deferred income	—			3,631		25,951		—			29,582
Intangible lease liabilities, net	—			—		38,458		—			38,458
Interest rate swaps	—			1,478		—		—			1,478
Liabilities held for sale, net	—			—		380		—			380
Total liabilities	5,381,985			2,502,121		2,433,585		(8,304,213		)	2,013,478
Equity:
Total stockholders’ equity	(270,258		)	4,278,052		1,318,211		(3,339,516		)	1,986,489
Total liabilities and stockholders’ equity	$	5,111,727		$	6,780,173	$	3,751,796	$	(11,643,729	)	$	3,999,967

Condensed Consolidated Statements of Income

Consolidating Statements of Income
For the three months ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	9,238		$	92,723		$	(483	)	$	101,478
Tenant reimbursements	—			2,195			19,961			(109		)	22,047
Property management fee revenue	—			—			4,147			(3,765		)	382
Other property related income	—			29			5,238			—			5,267
	—			11,462			122,069			(4,357		)	129,174
Expenses:
Property operating costs	—			4,927			52,067			(4,357		)	52,637
Depreciation	—			2,846			24,269			—			27,115
Amortization	—			463			14,782			—			15,245
General and administrative	86			1,539			6,633			—			8,258
	86			9,775			97,751			(4,357		)	103,255
Real estate operating income/(loss)	(86		)	1,687			24,318			—			25,919
Other income (expense):
Interest expense	—			(13,953		)	(3,614		)	1,880			(15,687		)
Other income/(expense)	—			36			2,575			(1,880		)	731
Loss on sale of real estate assets, net	—			(13		)	(10		)	—			(23		)
	—			(13,930		)	(1,049		)	—			(14,979		)
Income/(loss) before consolidated subsidiaries	(86		)	(12,243		)	23,269			—			10,940
Income from subsidiaries	11,028			24,557			—			(35,585		)	—
Net income	10,942			12,314			23,269			(35,585		)	10,940
Plus: Net loss applicable to noncontrolling interest	—			—			2			—			2
Net income applicable to Piedmont	$	10,942		$	12,314		$	23,271		$	(35,585	)	$	10,942

Consolidating Statements of Income
For the three months ended June 30, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	11,068		$	107,909		$	(485	)	$	118,492
Tenant reimbursements	—			2,966			21,446			(127		)	24,285
Property management fee revenue	—			—			4,590			(4,190		)	400
Other property related income	—			22			5,480			—			5,502
	—			14,056			139,425			(4,802		)	148,679
Expenses:
Property operating costs	—			5,853			55,236			(4,802		)	56,287
Depreciation	—			3,281			26,778			—			30,059
Amortization	—			803			18,511			—			19,314
General and administrative	81			1,528			5,919			—			7,528
	81			11,465			106,444			(4,802		)	113,188
Real estate operating income/(loss)	(81		)	2,591			32,981			—			35,491
Other income (expense):
Interest expense	—			(14,810		)	(7,262		)	3,651			(18,421		)
Other income/(expense)	—			2,240			1,449			(3,651		)	38
Equity in income of unconsolidated joint ventures	—			107			—			—			107
Gain/(loss) on sale of real estate assets, net	—			6,495			(3		)	—			6,492
Net income/(loss)	(81		)	(3,377		)	27,165			—			23,707
Plus: Net loss applicable to noncontrolling interest	—			—			3			—			3
Net income/(loss) applicable to Piedmont	$	(81	)	$	(3,377	)	$	27,168		$	—		$	23,710

Consolidating Statements of Income
For the six months ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	18,052		$	185,794		$	(914	)	$	202,932
Tenant reimbursements	—			4,840			40,395			(194		)	45,041
Property management fee revenue	—			—			8,328			(7,637		)	691
Other property related income	—			57			10,353			—			10,410
	—			22,949			244,870			(8,745		)	259,074
Expenses:
Property operating costs	—			9,641			103,600			(8,745		)	104,496
Depreciation	—			5,710			48,550			—			54,260
Amortization	—			1,074			30,904			—			31,978
General and administrative	186			3,425			11,199			—			14,810
	186			19,850			194,253			(8,745		)	205,544
Real estate operating income/(loss)	(186		)	3,099			50,617			—			53,530
Other income (expense):
Interest expense	—			(25,975		)	(7,312		)	3,842			(29,445		)
Other income/(expense)	—			160			4,859			(3,842		)	1,177
Loss on extinguishment of debt	—			(1,680		)	—			—			(1,680		)
Gain on sale of real estate assets, net	—			1,417			43,769			—			45,186
	—			(26,078		)	41,316			—			15,238
Income/(loss) before consolidated subsidiaries	(186		)	(22,979		)	91,933			—			68,768
Income from subsidiaries	68,958			92,226			—			(161,184		)	—
Net income	68,772			69,247			91,933			(161,184		)	68,768
Plus: Net loss applicable to noncontrolling interest	—			—			4			—			4
Net income applicable to Piedmont	$	68,772		$	69,247		$	91,937		$	(161,184	)	$	68,772

Consolidating Statements of Income
For the six months ended June 30, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Consolidated
Revenues:
Rental income	$	—		$	22,456		$	215,019		$	(944	)	$	236,531
Tenant reimbursements	—			5,971			43,381			(230		)	49,122
Property management fee revenue	—			—			9,226			(8,301		)	925
Other property related income	—			54			10,510			—			10,564
	—			28,481			278,136			(9,475		)	297,142
Expenses:
Property operating costs	—			11,655			109,937			(9,475		)	112,117
Depreciation	—			6,744			54,083			—			60,827
Amortization	—			1,659			38,070			—			39,729
General and administrative	183			3,231			12,264			—			15,678
	183			23,289			214,354			(9,475		)	228,351
Real estate operating income/(loss)	(183		)	5,192			63,782			—			68,791
Other income (expense):
Interest expense	—			(29,254		)	(14,514		)	7,290			(36,478		)
Other income/(expense)	—			4,469			2,759			(7,290		)	(62		)
Equity in income of unconsolidated joint ventures	—			118			—			—			118
Gain on sale of real estate assets, net	—			6,434			5			—			6,439
Net income/(loss)	(183		)	(13,041		)	52,032			—			38,808
Plus: Net loss applicable to noncontrolling interest	—			—			6			—			6
Net income/(loss) applicable to Piedmont	$	(183	)	$	(13,041	)	$	52,038		$	—		$	38,814

Condensed Statement of Comprehensive Income

Consolidating Statements of Comprehensive Income
For the Three Months Ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors		Eliminations			Piedmont (Consolidated)
Net income	$	10,942		$	12,314		$	23,271	$	(35,585	)	$	10,942
Effective portion of gain on derivative instruments that are designated and qualify as cash flow hedges	1,747			1,747			—		(1,747		)	1,747
Plus: Reclassification of gain included in net income	(245		)	(245		)	—		245			(245		)
Other comprehensive income	1,502			1,502			—		(1,502		)	1,502
Comprehensive income	$	12,444		$	13,816		$	23,271	$	(37,087	)	$	12,444

Consolidating Statements of Comprehensive Income
For the Six Months Ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)		Piedmont OP (the Issuer)		Non-Guarantors		Eliminations			Piedmont (Consolidated)
Net income	$	68,772	$	69,247	$	91,937	$	(161,184	)	$	68,772
Effective portion of gain on derivatives instruments that are designated and qualify as cash flow hedges	3,264		3,264		—		(3,264		)	3,264
Plus: Reclassification of net loss included in net income	807		807		—		(807		)	807
Other comprehensive income	4,071		4,071		—		(4,071		)	4,071
Comprehensive income	$	72,843	$	73,318	$	91,937	$	(165,255	)	$	72,843

Condensed Consolidated Statements of Cash Flows

Condensed Consolidating Statements of Cash Flows
For the six months ended June 30, 2018
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations			Piedmont (Consolidated)
Net Cash Provided by Operating Activities	$	71,842		$	73,022		$	99,557		$	(161,176	)	$	83,245
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	—			(3,159		)	(51,493		)	—			(54,652		)
Intercompany note receivable	—			88,000			—			(88,000		)	—
Net sales proceeds from wholly-owned properties	—			36,572			382,985			—			419,557
Note receivable issuance	—			—			(3,200		)	—			(3,200		)
Deferred lease costs paid	—			(20		)	(10,199		)	—			(10,219		)
Distributions from subsidiaries	353,518			64,863			—			(418,381		)	—
Net cash provided by investing activities	353,518			186,256			318,093			(506,381		)	351,486
Cash Flows from Financing Activities:
Debt issuance costs paid	—			(248		)	—			—			(248		)
Proceeds from debt	—			773,225			—			—			773,225
Repayments of debt	—			(780,000		)	(721		)	—			(780,721		)
Intercompany note payable	—			—			(88,000		)	88,000			—
Value of shares withheld to pay tax obligations related to employee stock compensation	(2,213		)	—			—			—			(2,213		)
Repurchases of common stock as part of announced plan	(266,062		)	—			—			—			(266,062		)
Distributions	(157,085		)	(250,818		)	(328,762		)	579,557			(157,108		)
Net cash used in financing activities	(425,360		)	(257,841		)	(417,483		)	667,557			(433,127		)
Net increase in cash, cash equivalents, and restricted cash and escrows	—			1,437			167			—			1,604
Cash, cash equivalents, and restricted cash and escrows, beginning of period	150			3,906			4,699			—			8,755
Cash, cash equivalents, and restricted cash and escrows, end of period	$	150		$	5,343		$	4,866		$	—		$	10,359

Condensed Consolidating Statements of Cash Flows
For the six months ended June 30, 2017
(in thousands)	Piedmont (Parent) (Guarantor)			Piedmont OP (the Issuer)			Non-Guarantors			Eliminations		Piedmont (Consolidated)
Net Cash Provided by/(Used in) Operating Activities	$	3,091		$	(10,029	)	$	118,678		$	—	$	111,740
Cash Flows from Investing Activities:
Investment in real estate assets, consolidated joint venture, and real estate related intangibles, net of accruals	—			(757		)	(57,563		)	—		(58,320		)
Investments in unconsolidated joint ventures	—			(284		)	—			—		(284		)
Net sales proceeds from wholly-owned properties	—			23,032			(9		)	—		23,023
Deferred lease costs paid	—			(736		)	(8,827		)	—		(9,563		)
Net cash provided by/(used in) investing activities	—			21,255			(66,399		)	—		(45,144		)
Cash Flows from Financing Activities:
Debt issuance costs paid	—			(102		)	—			—		(102		)
Proceeds from debt	—			147,000			—			—		147,000
Repayments of debt	—			(115,000		)	(694		)	—		(115,694		)
Costs of issuance of common stock	(74		)	—			—			—		(74		)
Value of shares withheld to pay tax obligations related to employee stock compensation	(3,380		)	—			—			—		(3,380		)
(Distributions to)/repayments from affiliates	92,020			(41,618		)	(50,402		)	—		—
Dividends paid and discount on dividend reinvestments	(91,657		)	—			(7		)	—		(91,664		)
Net cash used in financing activities	(3,091		)	(9,720		)	(51,103		)	—		(63,914		)
Net increase in cash, cash equivalents, and restricted cash and escrows	—			1,506			1,176			—		2,682
Cash, cash equivalents, and restricted cash and escrows, beginning of period	150			3,693			4,361			—		8,204
Cash, cash equivalents, and restricted cash and escrows, end of period	$	150		$	5,199		$	5,537		$	—	$	10,886

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Organization (Details) ft² in Millions	6 Months Ended
	Jun. 30, 2018 ft² segment subsidiary property asset market
Real Estate Properties [Line Items]
Number of wholly-owned subsidiaries | subsidiary	2
Percentage ownership by sole general partner	99.90%
Percentage ownership by sole limited partner	0.10%
Number of redevelopment assets | asset	1
Percentage of annualized lease revenue	91.00%
Number of operating segments | segment	1
U.S.
Real Estate Properties [Line Items]
Number of major U.S. office markets | market	8
In Service Office Properties
Real Estate Properties [Line Items]
Number of real estate properties | property	53
Square footage of real estate property | ft²	16.2
Percentage leased	90.60%

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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Concentration Risk [Line Items]
Reduction in tax liability			$ 200
Reclassification out of rental income	$ (101,478)	$ (118,492)	(202,932)	$ (236,531)
Reclassification into other property related income	5,267	5,502	10,410	10,564
Reclassification out of general and administrative expenses	(8,258)	(7,528)	(14,810)	(15,678)
Reclassification into property operating costs	$ 52,637	56,287	$ 104,496	112,117
Cumulative effect of accounting change (adoption of ASU 2016-01)					$ 0
Accounting Standards Update 2016-01
Concentration Risk [Line Items]
Cumulative effect of accounting change (adoption of ASU 2016-01)					$ 100
Reclassification Adjustment
Concentration Risk [Line Items]
Reclassification out of general and administrative expenses		500		1,000
Reclassification into property operating costs		500		1,000
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Concentration Risk [Line Items]
Reclassification out of rental income		5,500		10,600
Reclassification into other property related income		$ 5,500		$ 10,600

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Summary of Significant Accounting Policies - Revenue Recognition Amendments (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Accounting Policies [Abstract]
Rental income	$ 101,478	$ 118,492	$ 202,932	$ 236,531
Tenant reimbursements	22,047	24,285	45,041	49,122
Property management fee revenue	382	400	691	925
Other property related income	5,267	5,502	10,410	10,564
Total revenues	$ 129,174	$ 148,679	$ 259,074	$ 297,142

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Acquisitions (Details) $ in Millions	6 Months Ended
	Jun. 30, 2018 USD ($) ft² building
Business Acquisition [Line Items]
Properties acquired | building	1
501 West Church Street
Business Acquisition [Line Items]
Ownership Percentage Acquired	100.00%
Rentable Square Feet | ft²	182,461
Percentage Leased as of Acquisition	100.00%
Net Contractual Purchase Price (in millions) | $	$ 28.0

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Debt (Narrative) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) contract	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) contract	Jun. 30, 2017 USD ($)
Debt Instrument [Line Items]
Interest paid	$ 14,800,000	$ 16,700,000	$ 30,700,000	$ 36,000,000
Interest costs capitalized	346,000	$ 35,000	500,000	$ 100,000
$300 Million Unsecured 2013 Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Repayment of long-term debt			300,000,000
Face amount of debt instrument	300,000,000		300,000,000
$170 Million Unsecured 2015 Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Repayment of long-term debt			170,000,000
Face amount of debt instrument	170,000,000		170,000,000
$250 Million Unsecured 2018 Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Face amount of debt instrument	250,000,000		$ 250,000,000
Debt instrument term			7 years
Unencumbered interest coverage ratio			1.75
Unencumbered leverage ratio			1.60
Fixed charge coverage ratio			1.50
Maximum leverage ratio			0.60
Maximum secured debt ratio			0.40
Notional amount of interest rate swap agreements	150,000,000		$ 150,000,000
Line of Credit | $500 Million Unsecured 2015 Line of Credit | Unsecured Debt
Debt Instrument [Line Items]
Amount of line of credit	500,000,000		500,000,000
Net borrowings on lines of credit			215,000,000
Amount outstanding	238,000,000		238,000,000
Face amount of debt instrument	500,000,000		$ 500,000,000
Federal Funds Rate | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate			0.50%
London Interbank Offered Rate (LIBOR) | $300 Million Unsecured 2013 Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Basis spread on variable rate			1.20%
London Interbank Offered Rate (LIBOR) | $170 Million Unsecured 2015 Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Basis spread on variable rate			1.125%
London Interbank Offered Rate (LIBOR) | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Current basis spread on variable rate			1.60%
London Interbank Offered Rate (LIBOR) | $250 Million Unsecured 2018 Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Basis spread on variable rate			1.60%
London Interbank Offered Rate (LIBOR) | Line of Credit | $500 Million Unsecured 2015 Line of Credit | Unsecured Debt
Debt Instrument [Line Items]
Basis spread on variable rate			1.00%
Minimum | London Interbank Offered Rate (LIBOR) | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate			1.45%
Maximum | London Interbank Offered Rate (LIBOR) | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Basis spread on variable rate			2.40%
Interest rate swaps
Debt Instrument [Line Items]
Notional amount of interest rate swap agreements	$ 450,000,000		$ 450,000,000
Interest rate swaps | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Number of Swap Agreements | contract	3		3
Notional amount of interest rate swap agreements	$ 150,000,000		$ 150,000,000

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Debt (Schedule of Debt) (Details)	6 Months Ended
	Jun. 30, 2018 USD ($) period	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Weighted average rate	3.71%
Amount Outstanding	$ 1,720,846,000	$ 1,726,927,000
Interest rate swaps
Debt Instrument [Line Items]
Notional amount of interest rate swap agreements	450,000,000
$250 Million Unsecured 2018 Term Loan | Interest rate swaps
Debt Instrument [Line Items]
Notional amount of interest rate swap agreements	$ 150,000,000
$250 Million Unsecured 2018 Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Seven-Year Interest Rate Swap Agreement | Interest rate swaps
Debt Instrument [Line Items]
Notional amount of interest rate swap agreements	$ 100,000,000
Secured Debt
Debt Instrument [Line Items]
Weighted average rate	3.81%
Amount Outstanding	$ 190,990,000	191,616,000
Net premium, discounts, and unamortized debt issuance costs	$ 795,000	946,000
Secured Debt | $35 Million Fixed-Rate Loan
Debt Instrument [Line Items]
Stated Rate	5.55%
Effective interest rate	3.75%
Amount Outstanding	$ 30,195,000	30,670,000
Face amount of debt instrument	$ 35,000,000.0
Secured Debt | $160 Million Fixed Rate Loan
Debt Instrument [Line Items]
Stated Rate	3.48%
Effective interest rate	3.58%
Amount Outstanding	$ 160,000,000	160,000,000
Face amount of debt instrument	$ 160,000,000
Unsecured Debt
Debt Instrument [Line Items]
Weighted average rate	3.70%
Amount Outstanding	$ 1,529,856,000	1,535,311,000
Net premium, discounts, and unamortized debt issuance costs	$ (8,144,000)	(7,689,000)
Unsecured Debt | $170 Million Unsecured 2015 Term Loan
Debt Instrument [Line Items]
Effective interest rate	2.54%
Amount Outstanding	$ 0	170,000,000
Face amount of debt instrument	$ 170,000,000
Unsecured Debt | $170 Million Unsecured 2015 Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%
Unsecured Debt | $300 Million Unsecured 2013 Term Loan
Debt Instrument [Line Items]
Amount Outstanding	$ 0	300,000,000
Face amount of debt instrument	$ 300,000,000
Unsecured Debt | $300 Million Unsecured 2013 Term Loan | Interest rate swaps
Debt Instrument [Line Items]
Effective interest rate	2.78%
Unsecured Debt | $300 Million Unsecured 2013 Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.20%
Unsecured Debt | $500 Million Unsecured 2015 Line of Credit | Line of Credit
Debt Instrument [Line Items]
Effective interest rate	3.08%
Amount Outstanding	$ 238,000,000	23,000,000
Face amount of debt instrument	$ 500,000,000
Maximum extension period	1 year
Number of extension periods | period	2
Extension period	6 months
Unsecured Debt | $500 Million Unsecured 2015 Line of Credit | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.00%
Unsecured Debt | $300 Million Unsecured 2011 Term Loan
Debt Instrument [Line Items]
Amount Outstanding	$ 300,000,000	300,000,000
Face amount of debt instrument	$ 300,000,000
Unsecured Debt | $300 Million Unsecured 2011 Term Loan | Interest rate swaps
Debt Instrument [Line Items]
Effective interest rate	3.35%
Unsecured Debt | $300 Million Unsecured 2011 Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.15%
Unsecured Debt | $350 Million Senior Notes
Debt Instrument [Line Items]
Stated Rate	3.40%
Effective interest rate	3.43%
Amount Outstanding	$ 350,000,000	350,000,000
Face amount of debt instrument	$ 350,000,000
Unsecured Debt | $400 Million Senior Notes
Debt Instrument [Line Items]
Stated Rate	4.45%
Effective interest rate	4.10%
Amount Outstanding	$ 400,000,000	400,000,000
Face amount of debt instrument	$ 400,000,000
Unsecured Debt | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Effective interest rate	3.95%
Amount Outstanding	$ 250,000,000	$ 0
Face amount of debt instrument	250,000,000
Notional amount of interest rate swap agreements	$ 150,000,000
Unsecured Debt | $250 Million Unsecured 2018 Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Basis spread on variable rate	1.60%
Through March 29, 2020 | Unsecured Debt | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Interest rate on derivative instrument	4.11%
From March 30, 2020 through March 31, 2025 | Unsecured Debt | $250 Million Unsecured 2018 Term Loan
Debt Instrument [Line Items]
Interest rate on derivative instrument	4.21%

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Variable Interest Entities (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Eye Street 1201 N.W. Associates LLC
Variable Interest Entity [Line Items]
Piedmont's %	98.60%
Net Carrying Amount	$ 87.5	$ 81.1
Percent of cash flow entitled to entity	100.00%
Eye Street 1225 N.W. Associates LLC
Variable Interest Entity [Line Items]
Piedmont's %	98.10%
Net Carrying Amount	$ 64.5	65.2
Percent of cash flow entitled to entity	100.00%
Piedmont 500 W. Monroe Fee LLC
Variable Interest Entity [Line Items]
Piedmont's %	100.00%
Net Carrying Amount	$ 256.5	$ 263.2
Percent of cash flow entitled to entity	100.00%

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Derivative Instruments (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) contract	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) contract	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Derivative [Line Items]
Maximum period of extension term			81 months
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net [Abstract]
Gross derivative assets	$ 2,679,000		$ 2,679,000		$ 688,000
Gross derivative liabilities	0		0		(1,478,000)
Net derivative asset/(liability)	2,679,000		2,679,000		$ (790,000)
Amount of gain/(loss) recognized in OCI	1,747,000	$ (911,000)	3,264,000	$ 132,000
Total amount of Interest Expense presented in the consolidated statements of income	15,687,000	18,421,000	29,445,000	36,478,000
Total amount of Loss on Extinguishment of Debt presented in the consolidated statements of income	0	0	1,680,000	0
Loss on write off of discount and unamortized debt issuance costs			400,000
Gain (loss) to be reclassified	2,800,000		2,800,000
Gain (loss) from hedge ineffectiveness	0	0	0	0
Interest rate swaps
Derivative [Line Items]
Total Notional Amount (in millions)	450,000,000		450,000,000
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net [Abstract]
Total amount of Interest Expense presented in the consolidated statements of income	15,687,000	18,421,000	29,445,000	36,478,000
Interest rate swaps | Interest Expense
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net [Abstract]
Amount of gain/(loss) recognized in OCI	1,747,000	(911,000)	3,264,000	132,000
Amount of gain/(loss) reclassified from OCI	245,000	(977,000)	451,000	(2,283,000)
Interest rate swaps | Gain (Loss) On Extinguishment Of Debt
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net [Abstract]
Amount of gain/(loss) reclassified from OCI	$ 0	$ 0	$ (1,258,000)	$ 0
$250 Million Unsecured 2018 Term Loan | Interest rate swaps
Derivative [Line Items]
Number of Swap Agreements | contract	3		3
Total Notional Amount (in millions)	$ 150,000,000		$ 150,000,000
Unsecured Debt | $300 Million Unsecured 2011 Term Loan
Derivative [Line Items]
Face amount of debt instrument	$ 300,000,000		$ 300,000,000
Unsecured Debt | $300 Million Unsecured 2011 Term Loan | Interest Rate Swaps 1 through 3
Derivative [Line Items]
Number of Swap Agreements | contract	3		3
Total Notional Amount (in millions)	$ 300,000,000		$ 300,000,000
Unsecured Debt | $250 Million Unsecured 2018 Term Loan
Derivative [Line Items]
Face amount of debt instrument	250,000,000		250,000,000
Hedged portion of long-term debt	150,000,000		150,000,000
Total Notional Amount (in millions)	$ 150,000,000		$ 150,000,000
Unsecured Debt | $250 Million Unsecured 2018 Term Loan | Interest Rate Swaps 4 and 5
Derivative [Line Items]
Number of Swap Agreements | contract	2		2
Total Notional Amount (in millions)	$ 100,000,000		$ 100,000,000
Unsecured Debt | $250 Million Unsecured 2018 Term Loan Maturing 2020 | Interest Rate Swap 6
Derivative [Line Items]
Number of Swap Agreements | contract	1		1
Total Notional Amount (in millions)	$ 50,000,000		$ 50,000,000

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Fair Value Measurement of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	$ 2,679	$ 688
Interest rate swaps	0	1,478
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	8,944	7,382
Restricted cash and escrows	1,415	1,373
Accounts payable and accrued expenses	11,000	126,429
Debt, net	1,720,846	1,726,927
Interest rate swaps | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	2,679	688
Interest rate swaps	0	1,478
Tenant receivables, net | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Tenant receivables, net	9,323	12,139
Notes receivable | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Tenant receivables, net	3,200	0
Level 1 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Cash and cash equivalents	8,944	7,382
Restricted cash and escrows	1,415	1,373
Accounts payable and accrued expenses	11,000	126,429
Level 1 | Tenant receivables, net | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Tenant receivables, net	9,323	12,139
Level 1 | Notes receivable | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Tenant receivables, net	3,200	0
Level 2 | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, net	1,725,912	1,759,905
Level 2 | Interest rate swaps | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Interest rate swaps	2,679	688
Interest rate swaps	$ 0	$ 1,478

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Commitments and Contingencies (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) category	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) category	Jun. 30, 2017 USD ($)
Loss Contingencies [Line Items]
Number of tenant and building improvement categories | category	2		2
Collectibility of Tenant Reimbursements
Loss Contingencies [Line Items]
Reductions in reimbursement revenues	$ 0	$ 20,000	$ 400,000	$ 300,000
Non-Incremental Capital Expenditures
Loss Contingencies [Line Items]
Period for commitments for funding non-incremental capital expenditures			5 years
Potential obligations for tenant improvements	40,000,000		$ 40,000,000
Non-Incremental Capital Expenditures | Maximum
Loss Contingencies [Line Items]
Period for commitments for funding non-incremental capital expenditures			3 years
Incremental Capital Expenditures
Loss Contingencies [Line Items]
Potential obligations for tenant improvements	$ 11,800,000		$ 11,800,000

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Assets Held for Sale (Assets Held-for-Sale) (Details) $ in Thousands	Jun. 30, 2018 USD ($) property	Dec. 31, 2017 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Number of real estate properties sold | property	14
Total other assets held for sale, net	$ 0	$ 47,131
Disposal Group, Held-for-sale, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Total real estate assets held for sale, net	0	332,410
Straight-line rent receivables	0	25,975
Prepaid expenses and other assets	0	328
Deferred lease costs, less accumulated amortization of $0 and $16,549 as of June 30, 2018 and December 31, 2017, respectively	0	20,828
Total other assets held for sale, net	0	47,131
Intangible lease liabilities, less accumulated amortization of $0 and $935 as of June 30, 2018 and December 31, 2017, respectively	0	380
Accumulated amortization on deferred lease costs	0	16,549
Accumulated amortization on Intangible lease liabilities	0	935
Disposal Group, Held-for-sale, Not Discontinued Operations | Land
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net:	0	74,498
Disposal Group, Held-for-sale, Not Discontinued Operations | Building and building improvements
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net:	0	255,634
Accumulated depreciation (building improvements)	0	169,116
Disposal Group, Held-for-sale, Not Discontinued Operations | Construction in progress
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Real estate assets held for sale, net:	$ 0	$ 2,278

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Stock Based Compensation (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense related to stock awards	$ 4.0	$ 2.6	$ 5.0	$ 5.7
Compensation expense, non-vested awards	2.6	$ 1.1	$ 3.9	$ 4.2
Total shares issued to employees, directors, and officers (in shares)			354,526
Unrecognized compensation cost related to nonvested	$ 6.3		$ 6.3
Weighted Average
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to nonvested, weighted-average vesting period			2 years
Stock Awards | Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year

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Stock Based Compensation (Rollforward of Stock Awards) (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested and Potential Stock Awards, End of period (in shares)	1,103,207		1,103,207
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested and Potential Stock Awards, Beginning of period (in shares)			868,437
Unvested and Potential Stock Awards, End of period (in shares)	1,103,207		1,103,207
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value, Beginning of period (in dollars per share)			$ 21.69
Unvested and Potential Stock Awards, Weighted-Average Grant Date Fair Value, End of period (in dollars per share)	$ 22.42		$ 22.42
Deferred Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Deferred Stock Awards Granted (in shares)	354,236
Performance Stock Awards and Deferred Stock Awards Vested (in shares)			(331,195)
Deferred Stock Awards Forfeited (in shares)			(6,515)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Deferred Stock Awards Granted (in dollars per share)	$ 17.84	$ 21.38	$ 17.84	$ 21.38
Performance Stock Awards and Deferred Stock Awards Vested, Weighted-Average Grant Date Fair Value (in dollars per share)			19.21
Deferred Stock Awards Forfeited, Weighted-Average Grant Date Fair Value (in dollars per share)			$ 19.98
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Increase in Estimated Potential Share Award, net of forfeitures (in shares)			379,249
Performance Stock Awards and Deferred Stock Awards Vested (in shares)			(161,005)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Increase in Estimated Potential Share Award, net of forfeitures, Weighted-Average Grant Date Fair Value (in dollars per share)			$ 23.80
Performance Stock Awards and Deferred Stock Awards Vested, Weighted-Average Grant Date Fair Value (in dollars per share)			$ 18.47

XML

Stock Based Compensation (Additional Information Regarding Stock Award Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Deferred Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-Average Grant Date Fair Value of Deferred Stock Granted During the Period (in dollars per share)	$ 17.84	$ 21.38	$ 17.84	$ 21.38
Total Grant Date Fair Value of Deferred Stock Vested During the Period	$ 5,639	$ 5,551	$ 6,363	$ 5,841
Performance Share Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Liability Awards Paid During the Period	$ 0	$ 0	$ 2,947	$ 2,877

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Stock Based Compensation (Outstanding Employee Stock Awards) (Details) - $ / shares	May 17, 2018	May 18, 2017	May 24, 2016	Jan. 03, 2014	Jun. 30, 2018	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unvested Shares (in shares)					1,103,207
Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant Date Fair Value (in dollars per share)					$ 22.42	$ 21.69
Unvested Shares (in shares)					1,103,207	868,437
Deferred Stock Awards | Deferred Stock Award, Granted January 3, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Shares Granted (in shares)				72,969
Grant Date Fair Value (in dollars per share)				$ 16.45
Unvested Shares (in shares)					16,416
Deferred Stock Awards | Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Deferred Stock Awards | Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Deferred Stock Awards | Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Deferred Stock Awards | Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Deferred Stock Awards | Deferred Stock Award, Granted January 3, 2014 | Share-based Compensation Award, Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage				20.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 24, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Shares Granted (in shares)			208,055
Grant Date Fair Value (in dollars per share)			$ 19.91
Unvested Shares (in shares)					60,975
Deferred Stock Awards | Deferred Stock Award, Granted May 24, 2016 | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 24, 2016 | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 24, 2016 | Share-based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 24, 2016 | Share-based Compensation Award, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Shares Granted (in shares)		219,947
Grant Date Fair Value (in dollars per share)		$ 21.38
Unvested Shares (in shares)					124,281
Deferred Stock Awards | Deferred Stock Award, Granted May 18, 2017 | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 18, 2017 | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 18, 2017 | Share-based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 18, 2017 | Share-based Compensation Award, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 Deferred Stock Award Independent Directors | Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Shares Granted (in shares)	31,388
Grant Date Fair Value (in dollars per share)	$ 17.84
Unvested Shares (in shares)					31,388
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 Deferred Stock Award Independent Directors | Share-based Compensation Award, Tranche One | Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	100.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Shares Granted (in shares)	302,865
Grant Date Fair Value (in dollars per share)	$ 17.84
Unvested Shares (in shares)					241,409
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 | Share-based Compensation Award, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Deferred Stock Awards | Deferred Stock Award, Granted May 17, 2018 | Share-based Compensation Award, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	25.00%
Performance Share Awards | Performance Share Program Award, Granted May 24, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Shares Granted (in shares)			0
Grant Date Fair Value (in dollars per share)			$ 23.02
Unvested Shares (in shares)					119,371
Performance Share Awards | Performance Share Program Award, Granted May 18, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Shares Granted (in shares)		0
Grant Date Fair Value (in dollars per share)		$ 30.45
Unvested Shares (in shares)					143,335
Performance Share Awards | Performance Share Program Award, Granted May 17, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Net Shares Granted (in shares)	0
Grant Date Fair Value (in dollars per share)	$ 23.52
Unvested Shares (in shares)					366,032

XML

Supplemental Disclosures for the Statement of Consolidated Cash Flows (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017	Dec. 31, 2016
Supplemental Cash Flow Elements [Abstract]
Accrued capital expenditures and deferred lease costs	$ 8,920	$ 9,417
Change in accrued dividends and discount on dividend reinvestments	(101,800)	(30,532)
Change in accrued share repurchases as part of an announced plan	(1,277)	0
Cash and cash equivalents	8,944	9,596	$ 7,382	$ 6,992
Restricted cash and escrows	1,415	1,290	1,373	1,212
Total cash, cash equivalents, and restricted cash and escrows shown in the consolidated statement of cash flows	$ 10,359	$ 10,886	$ 8,755	$ 8,204

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Earnings Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Earnings Per Share [Abstract]
Weighted-average common shares outstanding – basic (in shares)	128,346,433	145,412,524	132,090,741	145,350,074
Plus: Incremental weighted-average shares from time-vested deferred and performance stock awards (in shares)	355,000	400,000	341,000	430,000
Weighted-average common shares outstanding – diluted (in shares)	128,700,743	145,813,130	132,431,642	145,779,709
Common stock, shares issued (in shares)	128,370,913	145,490,000	128,370,913	145,490,000	142,358,940
Common stock, shares outstanding (in shares)	128,370,913	145,490,000	128,370,913	145,490,000	142,358,940

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Guarantor and Non-Guarantor Financial Information (Condensed Consolidating Balance Sheets) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Assets:
Land	$ 547,602	$ 544,794
Buildings and improvements, less accumulated depreciation	2,409,749	2,418,023
Intangible lease assets, less accumulated amortization	70,271	77,805
Construction in progress	17,831	11,710
Real estate assets held for sale, net	0	332,410
Total real estate assets	3,045,453	3,384,742
Cash and cash equivalents	8,944	7,382	$ 9,596	$ 6,992
Tenant and straight-line rent receivables, net	181,487	175,309
Advances to affiliates		0
Investment in subsidiaries	0	0
Notes receivable	3,200	0
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	33,274	24,578
Goodwill	98,918	98,918
Deferred lease costs, net	252,714	261,907
Other assets held for sale, net	0	47,131
Total assets	3,623,990	3,999,967
Liabilities:
Debt, net	1,720,846	1,726,927
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	94,215	216,653
Advances from affiliates		0
Deferred income	25,532	29,582
Intangible lease liabilities, net	40,341	38,458
Interest rate swaps	0	1,478
Liabilities held for sale, net	0	380
Total liabilities	1,880,934	2,013,478
Equity:
Total stockholders’ equity	1,743,056	1,986,489		$ 2,097,703
Total liabilities and stockholders’ equity	3,623,990	3,999,967
Eliminations
Assets:
Land	0	0
Buildings and improvements, less accumulated depreciation	(300)	(300)
Intangible lease assets, less accumulated amortization	0	0
Construction in progress	0	0
Real estate assets held for sale, net		0
Total real estate assets	(300)	(300)
Cash and cash equivalents	0	0
Tenant and straight-line rent receivables, net	0	0
Advances to affiliates		(7,971,908)
Investment in subsidiaries	(4,546,744)	(3,437,471)
Notes receivable	(145,310)	(233,310)
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	(28)	(740)
Goodwill	0	0
Deferred lease costs, net	0	0
Other assets held for sale, net		0
Total assets	(4,692,382)	(11,643,729)
Liabilities:
Debt, net	(145,310)	(233,310)
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	(28)	(740)
Advances from affiliates		(8,070,163)
Deferred income	0	0
Intangible lease liabilities, net	0	0
Interest rate swaps		0
Liabilities held for sale, net		0
Total liabilities	(145,338)	(8,304,213)
Equity:
Total stockholders’ equity	(4,547,044)	(3,339,516)
Total liabilities and stockholders’ equity	(4,692,382)	(11,643,729)
Piedmont (Parent) (Guarantor) | Reportable Legal Entities
Assets:
Land	0	0
Buildings and improvements, less accumulated depreciation	0	0
Intangible lease assets, less accumulated amortization	0	0
Construction in progress	0	0
Real estate assets held for sale, net		0
Total real estate assets	0	0
Cash and cash equivalents	150	150
Tenant and straight-line rent receivables, net	0	0
Advances to affiliates		1,674,276
Investment in subsidiaries	1,743,439	3,437,299
Notes receivable	0	0
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	77	2
Goodwill	0	0
Deferred lease costs, net	0	0
Other assets held for sale, net		0
Total assets	1,743,666	5,111,727
Liabilities:
Debt, net	0	0
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	610	104,028
Advances from affiliates		5,277,957
Deferred income	0	0
Intangible lease liabilities, net	0	0
Interest rate swaps		0
Liabilities held for sale, net		0
Total liabilities	610	5,381,985
Equity:
Total stockholders’ equity	1,743,056	(270,258)
Total liabilities and stockholders’ equity	1,743,666	5,111,727
Piedmont OP (the Issuer) | Reportable Legal Entities
Assets:
Land	36,094	36,094
Buildings and improvements, less accumulated depreciation	176,704	180,886
Intangible lease assets, less accumulated amortization	0	181
Construction in progress	408	85
Real estate assets held for sale, net		32,815
Total real estate assets	213,206	250,061
Cash and cash equivalents	5,311	3,890
Tenant and straight-line rent receivables, net	15,467	16,891
Advances to affiliates		6,297,632
Investment in subsidiaries	2,803,136	0
Notes receivable	810	88,810
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	7,020	5,094
Goodwill	98,918	98,918
Deferred lease costs, net	15,530	16,611
Other assets held for sale, net		2,266
Total assets	3,159,398	6,780,173
Liabilities:
Debt, net	1,529,792	1,535,239
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	15,012	20,279
Advances from affiliates		941,494
Deferred income	2,185	3,631
Intangible lease liabilities, net	0	0
Interest rate swaps		1,478
Liabilities held for sale, net		0
Total liabilities	1,546,989	2,502,121
Equity:
Total stockholders’ equity	1,612,409	4,278,052
Total liabilities and stockholders’ equity	3,159,398	6,780,173
Non-Guarantors | Reportable Legal Entities
Assets:
Land	511,508	508,700
Buildings and improvements, less accumulated depreciation	2,233,345	2,237,437
Intangible lease assets, less accumulated amortization	70,271	77,624
Construction in progress	17,423	11,625
Real estate assets held for sale, net		299,595
Total real estate assets	2,832,547	3,134,981
Cash and cash equivalents	3,483	3,342
Tenant and straight-line rent receivables, net	166,020	158,418
Advances to affiliates		0
Investment in subsidiaries	169	172
Notes receivable	147,700	144,500
Prepaid expenses, restricted cash, escrows, interest rate swaps, and other assets	26,205	20,222
Goodwill	0	0
Deferred lease costs, net	237,184	245,296
Other assets held for sale, net		44,865
Total assets	3,413,308	3,751,796
Liabilities:
Debt, net	336,364	424,998
Accounts payable, accrued expenses, dividends payable, and accrued capital expenditures	78,621	93,086
Advances from affiliates		1,850,712
Deferred income	23,347	25,951
Intangible lease liabilities, net	40,341	38,458
Interest rate swaps		0
Liabilities held for sale, net		380
Total liabilities	478,673	2,433,585
Equity:
Total stockholders’ equity	2,934,635	1,318,211
Total liabilities and stockholders’ equity	$ 3,413,308	$ 3,751,796

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Guarantor and Non-Guarantor Financial Information (Consolidating Statements of Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Revenues:
Rental income	$ 101,478	$ 118,492	$ 202,932	$ 236,531
Tenant reimbursements	22,047	24,285	45,041	49,122
Property management fee revenue	382	400	691	925
Other property related income	5,267	5,502	10,410	10,564
Total revenues	129,174	148,679	259,074	297,142
Expenses:
Property operating costs	52,637	56,287	104,496	112,117
Depreciation	27,115	30,059	54,260	60,827
Amortization	15,245	19,314	31,978	39,729
General and administrative	8,258	7,528	14,810	15,678
Operating expenses	103,255	113,188	205,544	228,351
Real estate operating income	25,919	35,491	53,530	68,791
Other income (expense):
Interest expense	(15,687)	(18,421)	(29,445)	(36,478)
Other income/(expense)	731	38	1,177	(62)
Equity in income of unconsolidated joint ventures	0	107	0	118
Loss on extinguishment of debt	0	0	(1,680)	0
Gain on sale of real estate assets, net	(23)	6,492	45,186	6,439
Other income (expense)	(14,979)		15,238
Income/(loss) before consolidated subsidiaries	10,940		68,768
Income from subsidiaries	0		0
Net income	10,940	23,707	68,768	38,808
Plus: Net loss applicable to noncontrolling interest	2	3	4	6	$ (15)
Net income applicable to Piedmont	10,942	23,710	68,772	38,814	$ 133,564
Eliminations
Revenues:
Rental income	(483)	(485)	(914)	(944)
Tenant reimbursements	(109)	(127)	(194)	(230)
Property management fee revenue	(3,765)	(4,190)	(7,637)	(8,301)
Other property related income	0	0	0	0
Total revenues	(4,357)	(4,802)	(8,745)	(9,475)
Expenses:
Property operating costs	(4,357)	(4,802)	(8,745)	(9,475)
Depreciation	0	0	0	0
Amortization	0	0	0	0
General and administrative	0	0	0	0
Operating expenses	(4,357)	(4,802)	(8,745)	(9,475)
Real estate operating income	0	0	0	0
Other income (expense):
Interest expense	1,880	3,651	3,842	7,290
Other income/(expense)	(1,880)	(3,651)	(3,842)	(7,290)
Equity in income of unconsolidated joint ventures		0		0
Loss on extinguishment of debt			0
Gain on sale of real estate assets, net	0	0	0	0
Other income (expense)	0		0
Income/(loss) before consolidated subsidiaries	0		0
Income from subsidiaries	(35,585)		(161,184)
Net income	(35,585)	0	(161,184)	0
Plus: Net loss applicable to noncontrolling interest	0	0	0	0
Net income applicable to Piedmont	(35,585)	0	(161,184)	0
Reportable Legal Entities
Other income (expense):
Other income (expense)	0
Piedmont (Parent) (Guarantor) | Reportable Legal Entities
Revenues:
Rental income	0	0	0	0
Tenant reimbursements	0	0	0	0
Property management fee revenue	0	0	0	0
Other property related income	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	86	81	186	183
Operating expenses	86	81	186	183
Real estate operating income	(86)	(81)	(186)	(183)
Other income (expense):
Interest expense	0	0	0	0
Other income/(expense)	0	0	0	0
Equity in income of unconsolidated joint ventures		0		0
Loss on extinguishment of debt			0
Gain on sale of real estate assets, net	0	0	0	0
Other income (expense)			0
Income/(loss) before consolidated subsidiaries	(86)		(186)
Income from subsidiaries	11,028		68,958
Net income	10,942	(81)	68,772	(183)
Plus: Net loss applicable to noncontrolling interest	0	0	0	0
Net income applicable to Piedmont	10,942	(81)	68,772	(183)
Piedmont OP (the Issuer) | Reportable Legal Entities
Revenues:
Rental income	9,238	11,068	18,052	22,456
Tenant reimbursements	2,195	2,966	4,840	5,971
Property management fee revenue	0	0	0	0
Other property related income	29	22	57	54
Total revenues	11,462	14,056	22,949	28,481
Expenses:
Property operating costs	4,927	5,853	9,641	11,655
Depreciation	2,846	3,281	5,710	6,744
Amortization	463	803	1,074	1,659
General and administrative	1,539	1,528	3,425	3,231
Operating expenses	9,775	11,465	19,850	23,289
Real estate operating income	1,687	2,591	3,099	5,192
Other income (expense):
Interest expense	(13,953)	(14,810)	(25,975)	(29,254)
Other income/(expense)	36	2,240	160	4,469
Equity in income of unconsolidated joint ventures		107		118
Loss on extinguishment of debt			(1,680)
Gain on sale of real estate assets, net	(13)	6,495	1,417	6,434
Other income (expense)	(13,930)		(26,078)
Income/(loss) before consolidated subsidiaries	(12,243)		(22,979)
Income from subsidiaries	24,557		92,226
Net income	12,314	(3,377)	69,247	(13,041)
Plus: Net loss applicable to noncontrolling interest	0	0	0	0
Net income applicable to Piedmont	12,314	(3,377)	69,247	(13,041)
Non-Guarantors | Reportable Legal Entities
Revenues:
Rental income	92,723	107,909	185,794	215,019
Tenant reimbursements	19,961	21,446	40,395	43,381
Property management fee revenue	4,147	4,590	8,328	9,226
Other property related income	5,238	5,480	10,353	10,510
Total revenues	122,069	139,425	244,870	278,136
Expenses:
Property operating costs	52,067	55,236	103,600	109,937
Depreciation	24,269	26,778	48,550	54,083
Amortization	14,782	18,511	30,904	38,070
General and administrative	6,633	5,919	11,199	12,264
Operating expenses	97,751	106,444	194,253	214,354
Real estate operating income	24,318	32,981	50,617	63,782
Other income (expense):
Interest expense	(3,614)	(7,262)	(7,312)	(14,514)
Other income/(expense)	2,575	1,449	4,859	2,759
Equity in income of unconsolidated joint ventures		0		0
Loss on extinguishment of debt			0
Gain on sale of real estate assets, net	(10)	(3)	43,769	5
Other income (expense)	(1,049)		41,316
Income/(loss) before consolidated subsidiaries	23,269		91,933
Income from subsidiaries	0		0
Net income	23,269	27,165	91,933	52,032
Plus: Net loss applicable to noncontrolling interest	2	3	4	6
Net income applicable to Piedmont	$ 23,271	$ 27,168	$ 91,937	$ 52,038

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Guarantor and Non-Guarantor Financial Information (Consolidating Statements of Comprehensive Income) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont	$ 10,942	$ 23,710	$ 68,772	$ 38,814	$ 133,564
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 6)	1,747	(911)	3,264	132
Plus: Reclassification of gain included in net income	(245)	977	807	2,283
Other comprehensive income	1,502	81	4,071	2,443	$ 6,060
Comprehensive income applicable to Piedmont	12,444	23,791	72,843	41,257
Reportable Legal Entities | Piedmont (Parent) (Guarantor)
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont	10,942	(81)	68,772	(183)
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 6)	1,747		3,264
Plus: Reclassification of gain included in net income	(245)		807
Other comprehensive income	1,502		4,071
Comprehensive income applicable to Piedmont	12,444		72,843
Reportable Legal Entities | Piedmont OP (the Issuer)
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont	12,314	(3,377)	69,247	(13,041)
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 6)	1,747		3,264
Plus: Reclassification of gain included in net income	(245)		807
Other comprehensive income	1,502		4,071
Comprehensive income applicable to Piedmont	13,816		73,318
Reportable Legal Entities | Non-Guarantors
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont	23,271	27,168	91,937	52,038
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 6)	0		0
Plus: Reclassification of gain included in net income	0		0
Other comprehensive income	0		0
Comprehensive income applicable to Piedmont	23,271		91,937
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net income applicable to Piedmont	(35,585)	$ 0	(161,184)	$ 0
Effective portion of gain/(loss) on derivative instruments that are designated and qualify as cash flow hedges (See Note 6)	(1,747)		(3,264)
Plus: Reclassification of gain included in net income	245		(807)
Other comprehensive income	(1,502)		(4,071)
Comprehensive income applicable to Piedmont	$ (37,087)		$ (165,255)

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Guarantor and Non-Guarantor Financial Information (Condensed Consolidating Statements of Cash Flows) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	$ 83,245	$ 111,740
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(54,652)	(58,320)
Intercompany note receivable	0
Investments in unconsolidated joint ventures		(284)
Net sales proceeds from wholly-owned properties	419,557	23,023
Note receivable issuance	(3,200)	0
Deferred lease costs paid	(10,219)	(9,563)
Distributions from subsidiaries	0
Net cash provided by/(used in) investing activities	351,486	(45,144)
Cash Flows from Financing Activities:
Debt issuance costs paid	(248)	(102)
Proceeds from debt	773,225	147,000
Repayments of debt	(780,721)	(115,694)
Intercompany note payable	0
Costs of issuance of common stock	0	(74)
Shares withheld for payment of taxes related to employee stock compensation	(2,213)	(3,380)
Repurchases of common stock as part of announced plan	(266,062)	0
(Distributions to)/repayments from affiliates		0
Dividends paid and discount on dividend reinvestments	(157,108)	(91,664)
Net cash used in financing activities	(433,127)	(63,914)
Net increase in cash, cash equivalents, and restricted cash and escrows	1,604	2,682
Cash, cash equivalents, and restricted cash and escrows, beginning of period	8,755	8,204
Cash, cash equivalents, and restricted cash and escrows, end of period	10,359	10,886
Eliminations
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	(161,176)	0
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	0	0
Intercompany note receivable	(88,000)
Investments in unconsolidated joint ventures		0
Net sales proceeds from wholly-owned properties	0	0
Note receivable issuance	0
Deferred lease costs paid	0	0
Distributions from subsidiaries	(418,381)
Net cash provided by/(used in) investing activities	(506,381)	0
Cash Flows from Financing Activities:
Debt issuance costs paid	0	0
Proceeds from debt	0	0
Repayments of debt	0	0
Intercompany note payable	88,000
Costs of issuance of common stock		0
Shares withheld for payment of taxes related to employee stock compensation	0	0
Repurchases of common stock as part of announced plan	0
(Distributions to)/repayments from affiliates		0
Dividends paid and discount on dividend reinvestments	579,557	0
Net cash used in financing activities	667,557	0
Net increase in cash, cash equivalents, and restricted cash and escrows	0	0
Cash, cash equivalents, and restricted cash and escrows, beginning of period	0	0
Cash, cash equivalents, and restricted cash and escrows, end of period	0	0
Piedmont (Parent) (Guarantor) | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	71,842	3,091
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	0	0
Intercompany note receivable	0
Investments in unconsolidated joint ventures		0
Net sales proceeds from wholly-owned properties	0	0
Note receivable issuance	0
Deferred lease costs paid	0	0
Distributions from subsidiaries	353,518
Net cash provided by/(used in) investing activities	353,518	0
Cash Flows from Financing Activities:
Debt issuance costs paid	0	0
Proceeds from debt	0	0
Repayments of debt	0	0
Intercompany note payable	0
Costs of issuance of common stock		(74)
Shares withheld for payment of taxes related to employee stock compensation	(2,213)	(3,380)
Repurchases of common stock as part of announced plan	(266,062)
(Distributions to)/repayments from affiliates		92,020
Dividends paid and discount on dividend reinvestments	(157,085)	(91,657)
Net cash used in financing activities	(425,360)	(3,091)
Net increase in cash, cash equivalents, and restricted cash and escrows	0	0
Cash, cash equivalents, and restricted cash and escrows, beginning of period	150	150
Cash, cash equivalents, and restricted cash and escrows, end of period	150	150
Piedmont OP (the Issuer) | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	73,022	(10,029)
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(3,159)	(757)
Intercompany note receivable	88,000
Investments in unconsolidated joint ventures		(284)
Net sales proceeds from wholly-owned properties	36,572	23,032
Note receivable issuance	0
Deferred lease costs paid	(20)	(736)
Distributions from subsidiaries	64,863
Net cash provided by/(used in) investing activities	186,256	21,255
Cash Flows from Financing Activities:
Debt issuance costs paid	(248)	(102)
Proceeds from debt	773,225	147,000
Repayments of debt	(780,000)	(115,000)
Intercompany note payable	0
Costs of issuance of common stock		0
Shares withheld for payment of taxes related to employee stock compensation	0	0
Repurchases of common stock as part of announced plan	0
(Distributions to)/repayments from affiliates		(41,618)
Dividends paid and discount on dividend reinvestments	(250,818)	0
Net cash used in financing activities	(257,841)	(9,720)
Net increase in cash, cash equivalents, and restricted cash and escrows	1,437	1,506
Cash, cash equivalents, and restricted cash and escrows, beginning of period	3,906	3,693
Cash, cash equivalents, and restricted cash and escrows, end of period	5,343	5,199
Non-Guarantors | Reportable Legal Entities
Condensed Financial Statements, Captions [Line Items]
Net Cash Provided by Operating Activities	99,557	118,678
Cash Flows from Investing Activities:
Investment in real estate assets and real estate related intangibles, net of accruals	(51,493)	(57,563)
Intercompany note receivable	0
Investments in unconsolidated joint ventures		0
Net sales proceeds from wholly-owned properties	382,985	(9)
Note receivable issuance	(3,200)
Deferred lease costs paid	(10,199)	(8,827)
Distributions from subsidiaries	0
Net cash provided by/(used in) investing activities	318,093	(66,399)
Cash Flows from Financing Activities:
Debt issuance costs paid	0	0
Proceeds from debt	0	0
Repayments of debt	(721)	(694)
Intercompany note payable	(88,000)
Costs of issuance of common stock		0
Shares withheld for payment of taxes related to employee stock compensation	0	0
Repurchases of common stock as part of announced plan	0
(Distributions to)/repayments from affiliates		(50,402)
Dividends paid and discount on dividend reinvestments	(328,762)	(7)
Net cash used in financing activities	(417,483)	(51,103)
Net increase in cash, cash equivalents, and restricted cash and escrows	167	1,176
Cash, cash equivalents, and restricted cash and escrows, beginning of period	4,699	4,361
Cash, cash equivalents, and restricted cash and escrows, end of period	$ 4,866	$ 5,537

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Subsequent Events (Details)	Aug. 01, 2018 $ / shares
Subsequent Event
Subsequent Event [Line Items]
Dividends declared (in dollars per share)	$ 0.21